1. An ultra-micro stacked dark field photography system, comprising:

a sample platform (1) for carrying a sample (4);

a camera assembly (2) for taking a photograph of the sample (4);

the lifting assembly (3) is arranged on the sample platform (1) and used for driving the camera assembly (2) to move up and down to be close to or far away from the sample (4);

the photographing assembly (2) comprises a camera (201), a connecting lens barrel (202) and a dark field objective lens (203) which are sequentially connected, the dark field objective lens (203) is provided with a lens installation cavity (5) and an annular irradiation cavity (6) which is arranged around the lens installation cavity (5), the front end of the annular irradiation cavity (6) is provided with a reflector (7), and a lens assembly (8) is arranged in the lens installation cavity (5);

and after being reflected by the reflector (7), the annular light beam in the annular illumination cavity (6) illuminates the sample (4), and scattered light on the sample (4) enters a lens of a dark field objective lens (203) for imaging and is shot by the camera (201).

2. The ultra-micro stacked dark field photography system of claim 1, wherein: the connecting lens barrel (202) and the dark field objective lens (203) are connected through a connector (9), and the connector (9) comprises an inner cylinder (901) and an outer cylinder (902) which are sleeved;

the bottom end of the outer cylinder (902) is in threaded connection with the dark field objective (203), the top end of the outer cylinder is in threaded connection with the connecting lens barrel (202), and a sealing ring (13) is arranged between the bottom end of the inner cylinder (901) and the lens installation cavity (5);

an optical fiber feed-in cavity (10) is formed between the inner barrel (901) and the outer barrel (902), an optical fiber hole is formed in the side wall of the optical fiber feed-in cavity (10), one end of an optical fiber (11) is connected with the illuminator (12), and the other end of the optical fiber penetrates through the optical fiber hole to enter the optical fiber feed-in cavity (10) and extend into the annular irradiation cavity (6).

3. The ultra-micro stacked dark field photography system of claim 2, wherein: the optical fiber holes are uniformly distributed in a plurality of numbers around the circumference of the dark field objective lens (203), and each optical fiber hole is provided with the optical fiber (11).

4. The ultra-micro stacked dark field photography system of claim 2, wherein: the optical fiber (11) adopts an end point optical fiber.

5. The ultra-micro stacked dark field photography system of claim 2, wherein: the light emitter (12) may provide light sources of different colors.

6. The ultra micro stacked dark field photography system of any one of claims 1 to 5, wherein: the lifting assembly (3) comprises a guide rail (301), a sliding block (302) arranged on the guide rail (301) in a sliding mode and a driving element (303) for driving the sliding block (302) to move along the guide rail (301), the guide rail (301) is arranged on the sample platform (1), the extending direction of the guide rail is vertical upwards, and the photographing assembly (2) is fixedly arranged on the sliding block (302).

7. An ultra-micro stacked dark-field photography method using the photography system of any one of claims 1 to 6, wherein: placing a sample (4) to be shot on a sample platform (1), feeding a light source into an annular irradiation cavity (6), reflecting and irradiating an annular light beam on the sample (4) through a reflector (7), enabling scattered light on the sample (4) to enter a lens of a dark field objective (203) for imaging, driving the objective to run at equal intervals from top to bottom by a lifting assembly (3), shooting a local clear dark field image by a camera (201) every time of pausing, fusing a plurality of local clear images shot in the later period, and obtaining a super-depth-of-field from top to bottom clear dark field image.

Background

The stacked photography is a brand new technical mode generated when the photography technology enters the digital era, is different from the traditional shooting mode with a single shutter, and is used for synthesizing large-depth-of-field photos in a later-stage stacked mode by continuously shooting a plurality of even hundreds of photos with different focuses. The main applications of stacked photography are in macro, ultra and micro photography.

In the stack photography, an objective lens is generally used as a photographing lens, and various details of a photographed sample can be clearly observed at different magnifications. However, as the objective lens multiple is higher, the depth of field is shallower, and the working distance is smaller, such as about 5mm for a common 10-fold objective lens, and about 0.1mm for a 100-fold objective lens. Such a small space results in a very small amount of light entering the objective lens and very difficult light distribution around the sample, which in turn results in an image that cannot be acquired.

Disclosure of Invention

The invention mainly aims to provide an ultramicro stacked dark field photography system and an ultramicro stacked dark field photography method, and aims to solve the problems that the scene depth is shallow due to high objective lens multiple, the working distance is short, and light distribution is difficult.

In order to solve the technical problems, the invention adopts the following technical scheme:

an ultra-micro stacked dark field photography system, comprising:

a sample platform for carrying a sample;

the photographing component is used for photographing the sample;

the lifting assembly is arranged on the sample platform and used for driving the photographing assembly to move up and down so as to be close to or far away from the sample;

the photographing assembly comprises a camera, a lens barrel and a dark field objective lens which are sequentially connected, the dark field objective lens is provided with a lens installation cavity and an annular irradiation cavity which is arranged around the lens installation cavity, the front end of the annular irradiation cavity is provided with a reflector, and a lens assembly is arranged in the lens installation cavity;

and the annular light beam in the annular irradiation cavity irradiates the sample after being reflected by the reflector, and the scattered light on the sample enters a lens of the objective lens for imaging and is shot by the camera.

Specifically, the lens barrel is connected with the dark field objective lens through a connector, and the connector comprises an inner cylinder and an outer cylinder which are sleeved;

the bottom end of the outer cylinder is in threaded connection with the dark field objective lens, the top end of the outer cylinder is in threaded connection with the lens cone, and a sealing ring is arranged between the bottom end of the inner cylinder and the lens installation cavity;

an optical fiber feed-in cavity is formed between the inner cylinder and the outer cylinder, an optical fiber hole is formed in the side wall of the optical fiber feed-in cavity, one end of an optical fiber is connected with the illuminator, and the other end of the optical fiber penetrates through the optical fiber hole to enter the optical fiber feed-in cavity and extend into the annular irradiation cavity.

Specifically, a plurality of optical fiber holes are uniformly distributed around the circumference of the dark field objective lens, and the optical fiber is arranged in each optical fiber hole.

Specifically, the optical fiber is an end point optical fiber.

In particular, the light emitter may provide light sources of different colors.

Specifically, the lifting assembly comprises a guide rail, a sliding block arranged on the guide rail in a sliding mode and a driving element for driving the sliding block to move along the guide rail, the guide rail is arranged on the sample platform, the extending direction of the guide rail is vertical upwards, and the photographing assembly is fixedly arranged on the sliding block.

An ultra-micro stacked dark field photography method, characterized in that: placing a sample to be shot on a sample platform, feeding a light source into an annular irradiation cavity, irradiating an annular light beam on the sample through reflection of a reflector, enabling scattered light on the sample to enter a lens of a dark field objective lens for imaging, driving the objective lens to run at equal intervals from top to bottom by a lifting assembly, shooting a local clear dark field image by a camera every time of pause, fusing a plurality of local clear images to obtain a super-depth-of-field clear dark field image from top to bottom.

Compared with the prior art, at least one embodiment of the invention has the following beneficial effects: the problems that the scene depth is light due to the fact that the multiple of the objective lens is high, the working distance is short, light distribution is not easy to achieve are solved, a dark field image with super field depth and clarity can be obtained, the system is simple in structure, and illumination of light sources with different colors can be achieved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, 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 an ultra-micro stacked dark field photography system provided by an embodiment of the present invention;

FIG. 2 is a partial schematic view of an ultra-micro stacked dark field photography system provided by an embodiment of the present invention;

FIG. 3 is a chlorophytum pollen dark field image captured by the ultra-micro stacked dark field photography system provided by the embodiment of the invention;

FIG. 4 is a composite image of the chlorophytum comosum pollen captured by the ultra-micro stacked dark field photography system provided by the embodiment of the invention;

wherein: 1. a sample platform; 2. a camera assembly; 201. a camera; 202. connecting the lens cone; 203. a dark field objective lens; 3. a lifting assembly; 301. a guide rail; 302. a slider; 303. a drive element; 4. a sample; 5. A lens mounting cavity; 6. an annular irradiation chamber; 7. a reflective mirror; 8. a lens assembly; 9. a connector; 901. an inner barrel; 902. an outer cylinder; 10. an optical fiber feed-in cavity; 11. an optical fiber; 12. a light emitter; 13. and (5) sealing rings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1 and 2, an ultra-micro stacked dark field photography system comprises a sample platform 1, a photography component 2 and a lifting component 3, wherein the sample platform 1 is used for bearing a sample 4, the photography component 2 is used for photographing the sample 4, and the lifting component 3 is arranged on the sample platform 1 and used for driving the photography component 2 to move up and down so as to be close to or far away from the sample 4.

The photographing assembly 2 comprises a camera 201, a connecting lens barrel 202 and a dark field objective 203 which are sequentially connected, a lens of the dark field objective 203 is vertically aligned with a sample 4, the dark field objective 203 is provided with a lens installation cavity 5 and an annular irradiation cavity 6 which is arranged around the lens installation cavity 5, the front end of the annular irradiation cavity 6 is provided with a reflector 7 (a curved surface), at least two groups of lens assemblies 8 are arranged in the lens installation cavity 5, annular light beams in the annular irradiation cavity 6 are reflected by the reflector 7 and irradiated on the sample 4, scattered light on the sample 4 enters the lens installation cavity 5 of the dark field objective 203 and is imaged through the lens assemblies 8, and the imaged image is shot by the camera 201.

In the embodiment, the light beam in the annular irradiation cavity 6 irradiates the sample 4 through the reflector 7, the scattered light on the sample 4 enters the lens of the dark field objective lens 203 for imaging, the camera component 2 is driven by the lifting component 3 to move up and down, so that the camera 201 shoots different focal plane images of the sample 4, the problems that the scene depth is light due to the multiple height of the dark field objective lens 203 and the working distance is short, and light distribution is difficult are solved, the ultra-depth-of-field and clear dark field images can be obtained, the system is simple in structure, and light source illumination with different colors can be realized.

Specifically, the lens barrel is connected with the dark field objective 203 through a connector 9, the connector 9 includes an inner barrel 901 and an outer barrel 902 which are sleeved, the top ends of the inner barrel 901 and the outer barrel 902 are connected through threads, the bottom end of the outer barrel 902 is connected with the dark field objective 203 through threads, the top end is connected with the lens barrel through threads, an optical fiber feed-in cavity 10 is formed between the inner barrel 901 and the outer barrel 902, an optical fiber hole is formed in the side wall of the optical fiber feed-in cavity 10, one end of an optical fiber 11 is connected with a light emitter 12, the other end of the optical fiber passes through the optical fiber hole to enter the optical fiber feed-in cavity 10 and extend into the annular irradiation cavity 6, in order to prevent a light source from entering the lens installation cavity 5 through a gap between the inner barrel 901 and the lens installation cavity 5, and influence an imaging effect, a sealing ring 13 is arranged between the bottom end of the inner barrel 901 and the lens installation cavity 5.

In this embodiment, the optical fiber 11 feeds a light source into the annular illumination cavity 6, a plurality of optical fiber holes are uniformly distributed around the circumference of the dark field objective 203, the optical fiber 11 is disposed in each optical fiber hole, the illuminator 12 can provide light sources of different colors, and the optical fiber 11 is an end point optical fiber.

Referring to fig. 1, specifically, the lifting assembly 3 includes a guide rail 301, a slider 302 slidably disposed on the guide rail 301, and a driving element 303 for driving the slider 302 to move along the guide rail 301, the guide rail 301 is disposed on the sample platform 1, and the extending direction is vertical upward, and the camera assembly 2 is fixedly mounted on the slider 302. The driving element 303 may be a screw mechanism driven by an oil cylinder, an air cylinder or a motor.

The working process of the ultramicro stacked dark field photographic system is as follows: placing a sample 4 to be shot on a sample platform 1, feeding a light source into an annular irradiation cavity 6, reflecting and irradiating an annular light beam on the sample 4 through a reflector 7, enabling scattered light on the sample 4 to enter a lens of a dark field objective 203 for imaging, driving the dark field objective 203 to run at equal intervals from top to bottom by a lifting assembly 3, shooting a local clear dark field image by a camera 201 every time of pausing, fusing a plurality of local clear images to be shot in the later stage, and obtaining a super-depth-of-field dark field image which is clear from top to bottom.

Referring to fig. 3 and 4, a series of dark-field images of the captured chlorophytum comosum pollen and a composite image thereof are specifically processed as follows: the chlorophytum comosum pollen sample 4 is placed on the sample platform 1, the illuminator 12 is turned on, light emitted by the illuminator 12 enters the dark field objective 203 through the optical fiber 11 and irradiates the chlorophytum comosum pollen sample 4 through the reflector 7, scattered light on the sample 4 enters a lens of the dark field objective 203 for imaging, and the camera 201 shoots a dark field image of the chlorophytum comosum sample 4. The dark field objective 203 runs from top to bottom at an accurate and equidistant distance through the guide rail 301, and the camera 201 shoots a local clear dark field image every stop. And fusing the plurality of shot local clear images at the later stage to obtain a dark field image with super depth of field and clear from top to bottom.

Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.

Meanwhile, if the invention as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).

In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated. Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.

The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.