1. A projection device, characterized in that the projection device comprises:

an optical engine to emit a light beam;

a projection screen comprising an optical membrane, a rollable substrate, and a control mechanism;

the optical film is adhered to the curled substrate and used for reflecting the light beams emitted by the optical engine so as to display a picture;

a plurality of reinforcing ribs are additionally arranged on one side of the rollable substrate away from the optical membrane, and the length direction of each reinforcing rib is not parallel to the longitudinal direction of the rollable substrate;

the rollable substrate is fixedly connected with the control mechanism, the control mechanism can be tensioned to unfold the rollable substrate or rolled to retract the rollable substrate, and the rollable substrate supports the optical membrane in a flat state when unfolded.

2. The projection device of claim 1, wherein the rollable substrate is integrally formed with the plurality of ribs.

3. The projection device of claim 1, wherein the plurality of stiffeners are bonded to the rollable substrate or the plurality of stiffeners are fixed to the rollable substrate by screws.

4. The projection device of any of claims 1-3, wherein the plurality of ribs are connected by at least two flexible hinges.

5. The projection device of claim 4, wherein each flexible hinge extends through the plurality of ribs in a direction perpendicular to a thickness of the ribs, and the at least two flexible hinges are parallel or cross each other.

6. A projection device according to any of claims 1-3, wherein each rib is parallel to each other in a length direction and parallel to a transverse direction of the rollable substrate.

7. The projection device of claim 6, wherein a length of each stiffener is equal to a length of a side of the rollable substrate in the transverse direction.

8. A projection device as claimed in any one of claims 1 to 3, characterized in that the rollable substrate is provided with a protective coating on a side remote from the optical film.

9. The projection device of any of claims 1-3, wherein the crimpable substrate has a hardness between 60-70 Rockwell hardness.

10. The projection device of any of claims 1-3, wherein the projection screen further comprises a flexible carrier;

one side of the optical membrane that can curl the base plate is kept away from bond in on the flexible carrier, relative first side and second side all with control mechanism fixed connection on the flexible carrier, just control mechanism can be based on the first side and the second side of flexible carrier are taut in order to expand the flexible carrier, perhaps curl in order to pack up the flexible carrier, support when the flexible carrier expandes can curl the base plate and be in the horizontality.

11. The projection device of any of claims 1-3, wherein the control mechanism includes a curl assembly, a lift assembly, and a fixed support;

the curling assembly is fixed on the fixed support, the first side of the curlable substrate is fixedly connected with the curling assembly, and the curling assembly can control the optical membrane and the curlable substrate to curl on the curling assembly;

the first end of the lifting component is fixedly connected with the fixed support, the second end of the lifting component is fixedly connected with the second side edge corresponding to the first side edge of the curlable substrate, and the lifting component can control the curlable substrate to be unfolded.

12. The projection device of claim 11, wherein the projection device includes a base for receiving the optical engine and the projection screen, the optical engine having a fixed preset distance from the projection screen when the projection screen is in the extended state.

Background

With the continuous development of science and technology, projection equipment is more and more applied to the work and the life of people. Currently, a projection device mainly includes an optical engine and a projection screen. The projection screen comprises an optical diaphragm, a back plate and a fixed frame. The optical film is bonded on the back plate, and the fixed frame is wrapped around the optical film and the back plate. The optical engine is mainly used for emitting light beams to the optical film, and the optical film is used for receiving the light beams emitted by the optical engine so as to display pictures.

However, the back plate has a large area, and when the back plate is processed, the large back plate is easily deformed such as bulging, which further causes the uneven surface of the optical film adhered to the back plate, thereby affecting the display effect of the projection screen. In addition, the weight of the projection screen can be greatly increased by the back plate, the back plate is inconvenient to transport and hang, and the back plate can occupy larger space.

Disclosure of Invention

The application provides a projection equipment and projection screen, can solve the problem that fold and deformation appear easily in the optical film piece among the projection screen. The technical scheme is as follows:

a projection device, the projection device comprising:

an optical engine to emit a light beam;

a projection screen comprising an optical membrane, a rollable substrate, and a control mechanism;

the optical film is adhered to the curled substrate and used for reflecting the light beams emitted by the optical engine so as to display a picture;

a plurality of reinforcing ribs are additionally arranged on one side of the rollable substrate away from the optical membrane, and the length direction of each reinforcing rib is not parallel to the longitudinal direction of the rollable substrate;

the rollable substrate is fixedly connected with the control mechanism, the control mechanism can be tensioned to unfold the rollable substrate or rolled to retract the rollable substrate, and the rollable substrate supports the optical membrane in a flat state when unfolded.

Optionally, the rollable substrate is integrally formed with the plurality of stiffeners.

Alternatively, the plurality of reinforcing beads are bonded to the rollable base plate, or the plurality of reinforcing beads are fixed to the rollable base plate by screws.

Optionally, the plurality of reinforcing bars are connected by at least two flexible hinges.

Optionally, each flexible hinge penetrates the plurality of reinforcing ribs in a direction perpendicular to the thickness of the reinforcing ribs, and the at least two flexible hinges are parallel or cross each other.

Optionally, each rib is parallel to each other in a length direction and parallel to a transverse direction of the rollable substrate.

Optionally, a length of each rib is equal to a length of a side of the rollable substrate in the transverse direction.

Optionally, a protective coating is disposed on a side of the rollable substrate away from the optical film.

Optionally, the hardness of the rollable substrate is between 60-70 rockwell hardness.

Optionally, the projection screen further comprises a flexible carrier;

one side of the optical membrane that can curl the base plate is kept away from bond in on the flexible carrier, relative first side and second side all with control mechanism fixed connection on the flexible carrier, just control mechanism can be based on the first side and the second side of flexible carrier are taut in order to expand the flexible carrier, perhaps curl in order to pack up the flexible carrier, support when the flexible carrier expandes can curl the base plate and be in the horizontality.

Optionally, the control mechanism comprises a crimping assembly, a lifting assembly and a fixed support;

the curling assembly is fixed on the fixed support, the first side of the curlable substrate is fixedly connected with the curling assembly, and the curling assembly can control the optical membrane and the curlable substrate to curl on the curling assembly;

the first end of the lifting assembly is fixedly connected with the fixed support, the second end of the lifting assembly is fixedly connected with a second side edge, corresponding to the first side edge, of the curlable substrate, and the lifting assembly can control the curlable substrate to be unfolded;

optionally, the projection device includes a base, the base is configured to receive the optical engine and the projection screen, and when the projection screen is in the unfolded state, the optical engine and the projection screen have a fixed preset distance.

The technical scheme provided by the application has the beneficial effects that at least:

one side of keeping away from the optical film on the base plate that can curl is provided with and adds a plurality of strengthening ribs, and the length direction of every strengthening rib is nonparallel with the longitudinal direction of base plate that can curl, therefore a plurality of strengthening ribs can strengthen the intensity of base plate that can curl, the curling of base plate that can curl of being convenient for simultaneously to when base plate that can curl is in the horizontality, make base plate that can curl atress evenly in the transverse direction, be difficult to appear ripple and fold. Because the optical film is adhered to the curlable substrate, the optical film is not easy to wrinkle and deform, and the display effect of the projection screen can be improved. Because the control mechanism can be curled to retract the rollable substrate, the occupied space of the projection screen can be further reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a projection apparatus provided in an embodiment of the present application;

FIG. 2 is a schematic diagram of a front view of a projection screen according to an embodiment of the present disclosure;

fig. 3 is a schematic rear view of a projection screen according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a rollable substrate according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a front view of another projection screen provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of another projection apparatus provided in an embodiment of the present application.

Reference numerals:

1: an optical engine; 2: a projection screen; 3: base seat

21: an optical film; 22: a rollable substrate; 23: a flexible carrier; 24: a control mechanism; 25: reinforcing ribs;

241: a crimping assembly; 242: a lifting assembly; 243: and fixing the support.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Fig. 1 illustrates a schematic structural diagram of a projection device according to an embodiment of the present application, fig. 2 illustrates a schematic structural diagram of a front view of a projection screen according to an embodiment of the present application, and fig. 3 illustrates a schematic structural diagram of a rear view of a projection screen according to an embodiment of the present application. Fig. 4 illustrates a schematic structural diagram of a rollable substrate provided in an embodiment of the application. As shown in fig. 1, 2, 3, and 4, the projection apparatus includes: an optical engine 1 and a projection screen 2, the optical engine 1 is used for emitting light beams; the projection screen 2 includes an optical film 21, a rollable substrate 22, and a control mechanism 24; the optical film 21 is adhered to the rollable substrate 22, and the optical film 21 is used for reflecting the light beam emitted by the optical engine 1 so as to display a picture; a plurality of reinforcing ribs 25 are additionally arranged on one side of the rollable substrate 22 away from the optical film 21, and the length direction of each reinforcing rib 25 is not parallel to the longitudinal direction of the rollable substrate 22; the rollable substrate 22 is fixedly connected to a control mechanism 24, and the control mechanism 24 can be tensioned to unfold the rollable substrate 22 or rolled to retract the rollable substrate 22, and the rollable substrate 22 supports the optical film 21 in a flat state when unfolded.

In the embodiment of the present application, the side of the rollable substrate 22 away from the optical film 21 is provided with the plurality of reinforcing ribs 25, and the length direction of each reinforcing rib 25 is not parallel to the longitudinal direction of the rollable substrate 22, so the plurality of reinforcing ribs 25 can enhance the strength of the rollable substrate 22, facilitate the rolling of the rollable substrate 22, and when the rollable substrate 22 is in a flat state, the rollable substrate 22 is stressed uniformly in the transverse direction, and is not easy to generate ripples and wrinkles. Since the optical film 21 is adhered to the rollable substrate 22, the optical film 21 is less likely to be wrinkled and deformed, so that the display effect of the projection screen 2 can be improved. The space occupied by the projection screen 2 may be further reduced because the control mechanism 24 may be rolled to retract the rollable substrate 22.

The optical engine 1 may be an ultra-short-focus optical engine, and of course, the optical engine 1 may also be a short-focus optical engine or a long-focus optical engine.

The optical engine 1 may include a light source, an optical mechanical system, a lens, a DMD (Digital Micromirror array) chip, a control circuit board, an audio processing system, a sound Device, a heat dissipation system, and a heat sink, where the light source and the lens are both fixedly connected to the optical mechanical system, the DMD chip is disposed in the optical mechanical system, the DMD chip, the audio processing system, and the heat dissipation system are electrically connected to the control circuit board, the audio processing system is further electrically connected to the sound Device, and the heat dissipation system is further electrically connected to the heat sink.

Thus, the light beam emitted from the light source is emitted to the DMD chip in the optical-mechanical system, the control circuit board modulates the light beam emitted to the DMD chip by controlling the DMD chip, and emits the modulated light beam to the lens carrying the image information output by the control circuit board, and further emits the light beam to the optical film 21 included in the projection screen 2 through the lens for displaying. In addition, the control circuit board controls the audio processing system to process the audio information output by the control circuit board, and the processed audio information is played outside through the sound box. When the image information is displayed and the audio information is externally displayed, the control circuit board can control the heat dissipation system to drive the heat sink to dissipate heat, so that the function of each device is prevented from being influenced by high temperature.

The longitudinal direction of the rollable substrate 22 is a direction parallel to the vertical direction on the rollable substrate 22, and the transverse direction of the rollable substrate 22 is a direction parallel to the horizontal direction on the rollable substrate 22. The optical film 21 may be a film, a fresnel optical film, a black screen, a white plastic screen, or the like. When the optical film 21 is a thin film, the material of the optical film 21 may be PET (Polyethylene Terephthalate). The PET has strong corrosion resistance, high tensile strength and tearing strength, and excellent high temperature resistance, friction resistance and dimensional stability, so that the long service life of the optical film 21 can be ensured. Of course, the material of the optical film 21 may also be other materials, for example, when the optical film 21 is a fresnel optical film, the material may be synthetic resin, which is not limited in the embodiment of the present application.

The rollable substrate 22 may be a thin plate with a small thickness, which facilitates rolling, and reduces the thickness of the projection screen 2, so that the projection screen 2 is more beautiful. The material of the rollable substrate 22 may be metal, PP (Polypropylene), PC (Polycarbonate), PI (Polyimide), or other materials, but is not limited in this embodiment.

The hardness of the rollable substrate 22 may be set to a hardness that is easily curled, and for example, the hardness of the rollable substrate 22 may be between 60-70 rockwell hardness, which may facilitate the rolling and tensioning of the rollable substrate 22 at any time so as to bring the rolling and tensioning of the optical membrane 21.

The rollable substrate 22 may be manufactured by die rolling, extrusion, or the like, or may be manufactured by other methods, which is not limited in the present embodiment.

It should be noted that the surface of the rollable substrate 22 on the side close to the optical film 21 may be a flat surface to ensure the flatness of the optical film 21 bonded to the rollable substrate 22. The surface of the rollable substrate 22 on the side away from the optical film 21 may be a flat surface, or may be an uneven surface according to actual conditions, which is not limited in the embodiment of the present application.

The optical film 21 and the rollable substrate 22 may be bonded by a double-sided tape or an adhesive film, or may be bonded by other methods, which is not limited in the embodiments of the present application.

It should be noted that the side length of the optical film 21 may be equal to the corresponding side length on the rollable substrate 22, and of course, the side length of the optical film 21 may also be smaller than the corresponding side length on the rollable substrate 22 as long as the optical film 21 can be completely attached to the rollable substrate 22, which is not limited in the embodiment of the present application.

Each of the ribs 25 may be a strip-shaped structure, and of course, may also be a structure with other shapes, which is not limited in this embodiment of the present application. The material of the reinforcing rib 25 may be metal, PP (Polypropylene), PC (Polycarbonate), PI (Polyimide), or other materials, and of course, the material may also be other materials, which is not limited in this embodiment. The reinforcing ribs 25 may be rectangular or trapezoidal long reinforcing ribs 25 in cross section, or may be reinforcing ribs 25 in other shapes, which is not limited in the embodiment of the present application.

The material of the rib 25 may be the same as or different from the material of the rollable substrate 22. For example, when the material of the bead 25 is the same as that of the rollable substrate 22, the material of both the bead 25 and the rollable substrate 22 may be PP. When the material of the reinforcing rib 25 is different from that of the rollable base plate 22, the material of the rollable base plate 22 may be PP, the plurality of reinforcing ribs 25 may be made of a metal material, the rollable base plate 22 made of the PP material is more convenient to bend relative to the rollable base plate 22 made of the metal material, and the reinforcing ribs 25 made of the metal material have higher strength relative to the reinforcing ribs 25 made of the PP material, so that the rollable base plate 22 provided with the reinforcing ribs 25 is not only convenient to bend, but also has higher strength.

It should be noted that parameters such as the thickness and width of each rib 25 and the distance between two adjacent ribs 25 may be set based on parameters such as the curl diameter and the curl tightening force of the rollable substrate 22. When the curling diameter and the curl tightening force of the rollable substrate 22 are large, the thickness and the width of each reinforcing bead 25 and the pitch between the adjacent reinforcing beads 25 can be increased appropriately, which is not limited in the embodiment of the present application.

In some embodiments, as shown in fig. 4, each of the ribs 25 is parallel to each other in the lengthwise direction and parallel to the widthwise direction of the rollable substrate 22. Thus, when the rollable substrate 22 is in a flat state, each of the parallel ribs 25 can make the rollable substrate 22 more uniformly stressed at each position along the transverse and longitudinal directions, and V-shaped ripples and folds caused by uneven stress are not easy to occur, thereby enhancing the flatness and stability of the rollable substrate 22. Further, the length direction of each rib 25 is parallel to the transverse direction of the rollable substrate 22, so that the force applied to the rollable substrate 22 in the transverse direction is more uniform, and the ribs 25 can further improve the flatness and stability of the rollable substrate 22.

In some embodiments, the plurality of ribs 25 may be bonded to the rollable substrate 22, or may be fixed to the rollable substrate 22 by screws. Of course, the plurality of ribs 25 may be fixed to the rollable substrate 22 by riveting, ultrasonic welding, hot melting, or the like, which is not limited in the embodiment of the present application.

In other embodiments, rollable substrate 22 can be integrally formed with a plurality of ribs 25. The rollable substrate 22 may be integrally formed with the plurality of ribs 25 by die rolling, extrusion, or the like. Of course, the rollable substrate 22 with the plurality of ribs 25 may be formed by cutting or the like, which is not limited in the embodiment of the present application.

In some embodiments, the plurality of ribs 25 may be connected by at least two flexible hinges. The flexible hinge can be a chain structure formed by hinging a plurality of short sections, so that the mechanical strength is high, the bending is convenient, and the flexibility is high, so that the reinforcing ribs 25 connected to the flexible hinge are not easy to fall off.

In some embodiments, each flexible hinge may extend through a plurality of ribs 25 in a direction perpendicular to the thickness of the ribs 25, with at least two flexible hinges being parallel or intersecting each other. Thus, the flexible hinge can more effectively fix the plurality of reinforcing ribs 25 and can make the stress of the plurality of reinforcing ribs 25 more uniform.

It should be noted that, in the case where the plurality of reinforcing ribs 25 are connected by at least two flexible hinges, the distance between two adjacent reinforcing ribs 25 may be reduced according to the actual curling condition, and for example, the distance between two adjacent reinforcing ribs 25 may be set to 2mm or 3 mm. Thus, the plurality of ribs 25 and the at least two flexible hinges can be combined into a rollable curtain-shaped reinforcing plate, and the distance between two adjacent ribs 25 is small, so that the surface of the curtain-shaped reinforcing plate is relatively flat, the rollable base plate 22 can be removed, and the optical film 21 is directly adhered to the curtain-shaped reinforcing plate, thereby reducing the thickness of the projection screen 2. That is, the projection screen 2 may include only the optical film 21, the curtain-like reinforcing plate made up of the plurality of reinforcing ribs 25 and at least two flexible hinges, and the control mechanism 24.

It should also be noted that rounded corners may be provided at all the lateral edges of the ribs 25 to accommodate the change in the angle between two adjacent ribs 25, thereby enhancing the flexibility of the curtain-like reinforcing plate when it is curled.

In some embodiments, as shown in fig. 4, the length of each rib 25 is equal to the length of the side of the rollable substrate 22 in the lateral direction. In this way, each reinforcing rib 25 can more sufficiently reinforce the rollable base plate 22.

Of course, the length of each rib 25 may be adjusted to a small extent according to actual conditions, which is not limited in the embodiment of the present application. For example, the plurality of reinforcing ribs 25 may also be arranged in a matrix of reinforcing ribs 25 in rows and columns, and the length direction of each reinforcing rib 25 may be parallel to the transverse direction of the rollable base plate 22, so that the sum of the lengths of the plurality of reinforcing ribs 25 located on the same straight line along the transverse direction of the rollable base plate 22 may be equal to the length of the side edge of the rollable base plate 22 along the transverse direction, or of course, may be slightly smaller than the length of the side edge of the rollable base plate 22 along the transverse direction, which is not limited in the embodiment of the present application.

In some embodiments, the side of the rollable substrate 22 away from the optical film 21 may be provided with a protective coating. In this way, the protective coating can prevent the surface of the rollable substrate 22 away from the optical film 21 from being in direct contact with the optical film 21 when the rollable substrate 22 is in a rolled state, so that the surface of the rollable substrate 22 can be prevented from scratching the optical film 21 due to unsmooth or other reasons, and the service life of the optical film 21 can be prolonged. The protective coating may be a coating composed of flexible particles, or may be a colloidal coating, which is not limited in the embodiment of the present application. The protective coating can be made of a nano material, the nano material has good toughness, impact resistance and thermal stability, and after the protective coating is contacted with the optical membrane 21, the flatness, wind resistance and stability of the optical membrane 21 can be improved, and the service life of the optical membrane 21 can be prolonged.

In some embodiments, as shown in fig. 3, the control mechanism 24 may include a crimping assembly 241, a lifting assembly 242, and a fixed support 243; the curling element 241 is fixed on the fixed support 243, the first side of the rollable substrate 22 is fixedly connected with the curling element 241, and the curling element 241 can control the optical film 21 and the rollable substrate 22 to curl on the curling element 241; a first end of the lifting assembly 242 is fixedly connected to the fixed support 243, a second end of the lifting assembly 242 is fixedly connected to a second side of the rollable substrate 22 corresponding to the first side, and the lifting assembly 242 is capable of controlling the rollable substrate 22 to be unfolded.

The fixing support 243 may be fixedly connected to the mounting surface to fix the projection screen 2. The mounting surface may be a support surface of a fixing bracket or a wall surface of a wall body, as long as the fixing support of the projection screen 2 can be realized.

In some embodiments, the curling assembly 241 may include a curling controller, a curling motor, and a winding drum, the curling controller being electrically connected to the curling motor, the curling motor being fixed to the fixing support 243, an output shaft of the curling motor being fixedly connected to an end of the winding drum, and a first side of the rollable substrate 22 being fixedly connected to the winding drum. Wherein, the start-stop of curling motor can be controlled to the controller that curls, can drive the reel rotation after the curling motor starts. Thus, when the roll controller controls the roll to rotate, the optical film 21 and the rollable substrate 22 can be controlled to be rolled on the roll.

The curling controller can control the curling motor to rotate in the forward direction or the reverse direction when receiving a control signal sent by a remote controller in communication connection with the curling controller. Of course, the curling controller can also be electrically connected with a control key, and then a control signal can be sent to the curling controller through the control key so as to control the forward rotation or the reverse rotation of the curling motor. The curling controller can comprise a single chip microcomputer and a signal receiver, the single chip microcomputer is respectively electrically connected with the signal receiver and the curling motor, in this way, after the signal receiver receives a control signal, the signal receiver sends the control signal to the single chip microcomputer, and the single chip microcomputer controls the curling motor to rotate forwards or backwards based on the control signal.

The end parts of the coiling motor and the coiling drum can be relatively limited along the circumferential direction, so that the coiling drum can rotate synchronously along with the coiling motor. In addition, the winding drum can move axially relative to the winding motor, and therefore the winding drum can be detached.

When realizing being connected of crimping motor and reel, in some embodiments, the inner wall of reel can be provided with the wedge groove along the axial, can be provided with the voussoir on the motor shaft of crimping motor, and the voussoir can be followed the circumferencial direction chucking of reel and in the wedge groove to can realize that crimping motor's motor shaft and reel are fixed along the circumferencial direction, and then the synchronous rotation can be realized to reel and crimping motor's motor shaft.

The section of the wedge groove formed in the inner wall of the winding drum may be rectangular or trapezoidal, and may be of other shapes as long as the torque of the winding motor can be transmitted, which is not limited in the embodiments of the present application.

The number of the wedge grooves arranged on the inner wall of the winding drum can be one or more, and when the number of the wedge grooves is more, the wedge grooves can be distributed along the circumferential direction of the winding drum. The specific number of wedge grooves is set according to different torques transmitted by the coiling motor, so long as the torque of the coiling motor can be transmitted to the winding drum, and the winding drum has a certain service life, and the embodiment of the application does not limit the torque.

It should be noted that the crimping motor may be a stepper motor, which may facilitate control of the crimping motor by the crimping controller. For example, the curl controller may control the forward rotation and the reverse rotation of the stepping motor by sending a control signal to the stepping motor, so as to drive the winding drum to rotate forward and reverse.

Of course, the curling motor may be other motors, such as a dc speed reduction motor, as long as the motor can be conveniently controlled by the curling controller, which is not limited in the embodiment of the present application.

In other embodiments, the curling motor may include a motor body and a roller, the motor body is electrically connected to the curling controller, a motor shaft of the motor body is fixedly connected to the roller, a groove is axially formed in the circumferential surface of the roller, a boss matched with the groove is formed in the inner wall of the winding drum, and the boss can be limited in the groove.

Like this, the inner chamber of reel is packed into to the gyro wheel that will fix on the motor shaft of motor body to make recess on the gyro wheel and the boss cooperation of reel inner chamber, transmit the epaxial moment of torsion of motor shaft of motor body to the reel through the gyro wheel, thereby can realize the synchronous rotation of reel and motor body's motor shaft, and then realize the synchronous rotation of reel and crimping motor.

The section of the boss disposed on the inner wall of the winding drum may be rectangular or trapezoidal, and of course, may be other shapes as long as the torque of the winding motor can be transmitted, which is not limited in the embodiment of the present application.

The number of the bosses arranged on the inner wall of the winding drum can be one or multiple, and when the number of the bosses is multiple, the bosses can be arranged along the circumferential direction of the winding drum. The concrete quantity of boss sets up according to the difference of the moment of torsion that motor body transmitted, as long as can guarantee to transmit motor body's moment of torsion to the reel, and this reel has certain life can, and this application embodiment does not limit to this.

It should be noted that the motor body may be a stepping motor, which may facilitate the control of the curling motor by the curling controller. Of course, the motor body may be other motors as long as the motor body can be conveniently controlled by the curl controller, and the embodiment of the present application does not limit this.

It should be noted that, in addition to the two embodiments described above, the motor shaft of the winding motor and the winding drum can be synchronously rotated, and the motor shaft of the winding motor and the winding drum can also be synchronously rotated through other structures, which is not limited in the embodiments of the present application.

When realizing the fixed of base plate 22 and the reel that can curl, in some embodiments, the outer wall of reel can be provided with the draw-in groove along the axial, and the first side of base plate 22 that can curl can be provided with the card strip that matches with the draw-in groove, and the card strip can be along the radial spacing in the draw-in groove of reel to can realize the first side of base plate 22 that can curl along the circumferencial direction of reel spacing.

Thus, when the reel rotates, the first side edge of the rollable substrate 22 can be rolled synchronously with the reel through the limit of the clamping strip, so that the rollable substrate 22 can be rolled on the reel. And because the spacing of card strip, can make the reel provide certain pulling force to the first side of curlable base plate 22, this pulling force can mutually support under the effect when unrolling with the second side of curlable base plate 22, make curlable base plate 22 more level and more smooth to improve the display effect of setting up optical film 21 on curlable base plate 22.

Wherein, the cross-section of draw-in groove and the cross-section of card strip can all be the shape of falling T structure, like this, when draw-in groove and card strip fixed connection, can directly insert the draw-in groove with the card strip along the length direction of draw-in groove to carry on spacingly to the draw-in groove, realize the fixed connection of card strip and draw-in groove, thereby can convenient and fast will curl the first side of base plate 22 and fix on the reel.

It should be noted that, the cross section of the clamping groove and the cross section of the clamping strip may be square, except for being in an inverted T shape, and of course, may also be in other shapes as long as the clamping groove can limit the clamping strip along the circumferential direction of the winding drum, which is not limited in the embodiment of the present application.

Wherein, the depth of the clamping groove can be equal to the height of the clamping strip. Thus, when the reel rotates to drive the rollable substrate 22 to curl, the rollable substrate 22 can be tightly attached to the reel, so that the phenomenon that the rollable substrate 22 is subjected to shearing force of the edge of the clamping strip or the clamping groove when the height of the clamping strip is greater than or less than the depth of the clamping groove is avoided.

It should be noted that, in addition to the limitation of the circumferential direction of the first side edge winding drum of the rollable substrate 22 through the matching of the clamping groove and the clamping strip, the limitation of the circumferential direction of the first side edge winding drum of the rollable substrate 22 can be realized through the adhesion of the outer wall of the winding drum and the first side edge of the rollable substrate 22, and of course, the limitation of the circumferential direction of the first side edge winding drum of the rollable substrate 22 can also be realized through other modes, which is not described in detail herein in the embodiments of the present application.

In some embodiments, the lift assembly 242 may include a lift controller electrically connected to a lift motor, a support frame, and an elongate rigid frame, wherein the lift motor and the support frame are respectively fixed to the fixed support 243 at a first end and the support frame is connected to the elongate rigid frame at a second end. The length direction of the elongate rigid frame may coincide with the length direction of the second side of the rollable substrate 22, and the length of the elongate rigid frame may be equal to the length of the second side of the rollable substrate 22. Thus, the strip rigid frame may be fixedly connected to the second side of the rollable substrate 22, and the strip rigid frame may limit the rollable substrate 22 along the length direction, thereby ensuring the flatness of the rollable substrate 22. The start-stop of elevator motor can be controlled to the lift controller, and elevator motor can adjust the second end of support frame and the distance between the subassembly 241 that curls, and then the support frame can be based on rectangular rigid frame and the being connected of base plate 22 that can curl, and control optics diaphragm 21 and the base plate 22 that can curl expand and be in the horizontality.

Thus, after the lifting controller controls the lifting motor to start, the lifting motor can drive the second end of the support frame to ascend, and further drive the second side edge of the rollable substrate 22 to ascend, and at the moment, the rollable substrate 22 can be unfolded while the rollable substrate 22 is controlled by the rolling assembly 241 to rotate reversely. In addition, when the lifting motor drives the second end of the support frame to descend, the second side edge of the rollable substrate 22 can be driven to descend, and at the moment, the rollable substrate 22 controlled by the rolling component 241 can be folded while rotating in the forward direction.

The lifting controller can control the lifting motor to rotate in the forward direction or rotate in the reverse direction when receiving a control signal sent by a remote controller in communication connection with the lifting controller so as to control the lifting or descending of the support frame. Of course, the lifting controller can also be electrically connected with a control key, and at the moment, a control signal can be sent to the lifting controller through the control key so as to control the lifting or descending of the support frame through the forward rotation or reverse rotation of the lifting motor.

Wherein, the lifting controller can include singlechip and signal receiver, and the singlechip is connected with signal receiver and elevator motor electricity respectively, and like this, after signal receiver received control signal, signal receiver sends control signal to singlechip, and the singlechip is based on this control signal control elevator motor's corotation or reversal.

It should be noted that when the structure of the curling element 241 is as described above, the lifting controller and the curling controller may be the same controller. Thus, when the projection device is started, after the same controller receives a starting signal sent by a remote controller in communication connection with the same controller, the curling motor and the lifting motor can be controlled to be started simultaneously based on the starting signal, at the moment, the curling motor drives the winding drum to synchronously rotate reversely, and the lifting motor drives the second end of the support frame to ascend, so that the curling substrate 22 and the optical film 21 can be jointly unfolded. When the projection equipment is closed, after the same controller receives a closing signal sent by a remote controller in communication connection with the same controller, the curling motor and the lifting motor can be controlled to be started simultaneously based on the closing signal, at the moment, the curling motor drives the winding drum to rotate forwards synchronously, and the lifting motor drives the second end of the support frame to descend, so that the curling of the curlable substrate 22 and the optical film 21 is realized.

It should be noted that, when the rollable substrate 22 and the optical film 21 are jointly unfolded, the height to be raised of the second side of the rollable substrate 22 may be designed in advance, and then the operation duration of the rolling motor and the lifting motor is controlled in advance according to the height, that is, when the same controller receives a start signal, the second side of the rollable substrate 22 may be automatically controlled to be raised to the required height within the operation duration, so as to completely unfold the rollable substrate 22 and the optical film 21; or automatically controlling the second side of the rollable substrate 22 to roll on the roll during the running time upon receipt of the close signal to achieve full retraction of the rollable substrate 22 and the optical film 21. Of course, it is also possible to achieve complete deployment or retraction of the rollable substrate 22 and the optical film 21 by manually controlling the same controller.

The support frame may be a foldable support frame or a telescopic support frame, as long as the optical film 21 and the rollable substrate 22 can be controlled to be unfolded to be in a flat state, which is not limited in the embodiment of the present application.

In some embodiments, as shown in fig. 5, projection screen 2 may further include a flexible carrier 23; the side of the rollable substrate 22 away from the optical film 21 is bonded to the flexible carrier 23, opposite first and second sides of the flexible carrier 23 are fixedly connected to the control mechanism 24, and the control mechanism 24 can be tensioned based on the first and second sides of the flexible carrier 23 to unfold the flexible carrier 23, or rolled to retract the flexible carrier 23, and the flexible carrier 23 supports the rollable substrate 22 in a flat state when unfolded.

Thus, while the control mechanism 24 indirectly tensions the rollable substrate 22 through the flexible carrier 23, the flexible carrier 23 can bear a part of the tension of the control mechanism 24, so that the rollable substrate and the optical film 21 are not easily damaged, and the flatness of the optical film 21 can be further ensured.

The connection relationship between the flexible carrier 23 and the curling element 241 and the lifting element 242 included in the control mechanism 24 is the same as or similar to the connection relationship between the rollable substrate 22 and the curling element 241 and the lifting element 242 in the above embodiments, and the description of the embodiments of the present application is omitted.

The flexible carrier 23 may be a carrier such as a synthetic cloth or a film that can be easily rolled and has a load-bearing strength. When the flexible carrier 23 is a synthetic cloth, the material of the flexible carrier 23 may be a synthetic material containing nylon. Because the nylon material has high mechanical strength, good toughness and higher tensile strength and compressive strength, the flexible carrier 23 is not easy to deform when being tensioned by the control mechanism 24, and has a flat surface, so that the flatness of the rollable substrate 22 and the optical membrane 21 can be improved. Of course, the material of the flexible carrier 23 may be other materials, which is not limited in the embodiments of the present application.

The rollable substrate 22 and the flexible carrier 23 may be bonded by a double-sided tape or an adhesive film, or may be bonded by other methods, which is not limited in this embodiment. One side of the rollable substrate 22 adjacent to the first side of the flexible carrier 23 can be fixedly attached to the control mechanism 24 by screws. Of course, the rollable substrate may not be directly connected to the control mechanism 24, and the embodiment of the present application is not limited thereto.

It should be noted that when the control mechanism 24 includes the curling element 241, a side of the rollable substrate 22 near the first side of the flexible carrier 23 can be fixedly connected to the curling element 241 by screws. In this way, the rollable substrate 22 can share the tension force applied to a part of the flexible carrier 23, so that the flexible carrier 23 is not easily deformed, and the stability of the flexible carrier 23 is ensured, thereby enhancing the stability of the rollable substrate 22 and making the rollable substrate 22 not easily shake.

In some embodiments, as shown in fig. 6, the projection device may include a base 3, where the base 3 is used to house the optical engine 1 and the projection screen 2, and when the projection screen 2 is in the unfolded state, the optical engine 1 and the projection screen 2 have a fixed preset distance. Thus, when the projection device is not used, the optical engine 1 and the projection screen 2 can be accommodated in the base 3, which is convenient for saving space. When the projection apparatus is in a use state, the projection screen 2 may be unfolded, and the optical engine 1 may project a light beam onto the projection screen 2 so that the projection screen 2 displays an image. And the base 3 can keep a fixed preset distance between the optical engine 1 and the projection screen 2, thereby keeping a preset projection ratio.

When the projection screen 2 includes the optical film 21, the rollable substrate 22, and the control mechanism 24, the optical film 21, the rollable substrate 22, and the control mechanism 24 can be accommodated in the chassis 3, and the optical film 21, the rollable substrate 22, and the control mechanism 24 can be simultaneously unfolded. When the projection screen 2 includes other structures, the other structures may be received in the base 3 and may also be deployed simultaneously. Further, when the control mechanism 24 includes the lifting assembly 242 and the curling assembly 241, the lifting assembly 242 and the curling assembly 241 may also be housed within the base 3, and the lifting assembly 242 may be extended out of the base 3 and deployed.

In some embodiments, the base 3 may include a first accommodating portion and a second accommodating portion, the optical engine 1 is disposed in an inner cavity of the first accommodating portion, the first accommodating portion is provided with a light-transmitting area, and the light beam emitted from the optical engine 1 can pass through the light-transmitting area. The control mechanism 24 may be disposed in an inner cavity of the second accommodating portion, and the control mechanism 24 may control the optical film 21 and the rollable substrate 22 to be accommodated in the second accommodating portion. The second accommodating portion is provided with an opening, the control mechanism 24 can control the optical film 21 and the rollable substrate 22 to protrude out of the opening and to be unfolded, and when the control mechanism 24 includes the lifting member 242, the lifting member 242 can protrude out of the opening and to be unfolded. The optical film 21 is unfolded to receive the light beam transmitted through the light-transmitting area.

In some embodiments, the base 3 may be a T-shaped structure, and the volume of the first receiving portion is smaller than the volume of the second receiving portion.

The first accommodating portion and the second accommodating portion may be detachably connected, and certainly, the first accommodating portion and the second accommodating portion may not be detachably connected, that is, the first accommodating portion and the second accommodating portion may be integrally connected.

It should be noted that, when the first accommodating portion and the second accommodating portion are detachably connected, if the optical engine 1 fails, the first accommodating portion may be detached, and the first accommodating portion provided with the optical engine 1 is sent to be maintained as a whole, and if the curling assembly 241 included in the projection screen 2 fails, the second accommodating portion may be detached, and the second accommodating portion provided with the curling assembly 241 is sent to be maintained as a whole, so as to avoid sending the whole projection apparatus to be maintained.

In some embodiments, the first receiving portion and the second receiving portion may be further connected by a telescopic rod, and the telescopic rod may extend and contract along an axial direction of the telescopic rod, that is, along with the extension and contraction of the telescopic rod, a vertical distance between a center point of the light-transmitting area on the first receiving portion and an opening on the second receiving portion may be adjusted, so as to adjust a projection distance between a center point of the light beam emitted from the optical engine 1 and a plane where the projection screen 2 is located when the projection screen 2 is unfolded, so as to adjust a size of a display picture of the light beam emitted from the optical engine 1 on the projection screen 2. In addition, since the vertical distance between the central point of the light-transmitting area on the first accommodating part and the opening on the second accommodating part is adjustable, the projection device can be adapted to optical engines 1 with different projection ratios under the condition of ensuring the size of a display picture.

In the embodiment of the application, one side of keeping away from the optical film on the base plate that can curl is provided with and adds a plurality of strengthening ribs, and the length direction of every strengthening rib is nonparallel with the longitudinal direction of base plate that can curl, therefore a plurality of strengthening ribs can strengthen the intensity of base plate that can curl, the curling of base plate that can curl of being convenient for simultaneously to when base plate that can curl is in the horizontality, make the base plate that can curl atress evenly on the transverse direction, be difficult to appear ripple and fold. Because the optical film is adhered to the curlable substrate, the optical film is not easy to wrinkle and deform, and the display effect of the projection screen can be improved. Because the control mechanism can be curled to retract the rollable substrate, the occupied space of the projection screen can be further reduced. When the projection screen comprises the flexible carrier, the rollable substrate can be adhered to the flexible carrier, and the control mechanism can tension the flexible carrier based on the first side and the second side of the flexible carrier, so that the flexible carrier can bear part of the tension force of the control mechanism while the control mechanism indirectly tensions the rollable substrate through the flexible carrier, and the rollable substrate and the optical membrane are not easily damaged. Therefore, the flatness of the optical film can be further ensured, and the display effect of the projection screen is improved. In addition, the base can accommodate the optical engine and the projection screen, so that the occupied space can be reduced when the projection device is not used.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.