1. An optical lens group, which is used in a medical lighting device and comprises a first lens, a second lens, a third lens and a fourth lens which are coaxially arranged in sequence from a light source to a target image surface;

the first lens, the second lens, the third lens and the fourth lens are meniscus convex lenses;

the first lens is provided with a first curved surface and a second curved surface, the second lens is provided with a third curved surface and a fourth curved surface, the third lens is provided with a fifth curved surface and a sixth curved surface, the fourth lens is provided with a seventh curved surface and an eighth curved surface, and the first curved surface, the second curved surface, the third curved surface and the fourth curved surface are all arranged in sequence and are all concave to one side of the light source; the fifth curved surface, the sixth curved surface, the seventh curved surface and the eighth curved surface are all spherical surfaces which are arranged in sequence and are all convex to one side of the light source.

2. An optical lens group according to claim 1, characterized in that the radius of curvature of said first curved surface is-2.1 x (1 ± 5%) mm and the radius of curvature of said second curved surface is-3.2 x (1 ± 5%) mm;

the radius of curvature of the third curved surface is-19 x (1 +/-5%) millimeters, and the radius of curvature of the fourth curved surface is-7 x (1 +/-5%) millimeters;

the curvature radius of the fifth curved surface is 20 x (1 +/-5%) millimeters, and the curvature radius of the sixth curved surface is 225 x (1 +/-5%) millimeters;

the curvature radius of the seventh curved surface is 10 x (1 +/-5%) mm, and the curvature radius of the eighth curved surface is 15 x (1 +/-5%) mm.

3. An optical lens group according to claim 1, characterized in that the first lens has a central thickness of 2.9 x (1 ± 5%) mm;

the second lens has a center thickness of 2 x (1 ± 5%) millimeters;

the third lens has a center thickness of 3.1 x (1 ± 5%) millimeters;

the center thickness of the fourth lens was 3 × (1 ± 5%) millimeters.

4. The optical lens group of claim 1, wherein the distance between the second curved surface and the third curved surface is 0.3-0.5 mm; the distance between the fourth curved surface and the fifth curved surface is 0.1-0.3 mm; the distance between the sixth curved surface and the seventh curved surface is 0.4-0.6 mm.

5. The optical lens group of claim 4, wherein the spacing between the second curved surface and the third curved surface is 0.4 millimeters; the distance between the fourth curved surface and the fifth curved surface is 0.2 mm; the distance between the sixth curved surface and the seventh curved surface is 0.5 mm.

6. The optical lens assembly as claimed in claim 1, wherein the refractive index of the first lens is in a range of 1.8 to 1.9, the refractive index of the second lens is in a range of 1.8 to 1.9, the refractive index of the third lens is in a range of 1.6 to 1.7, and the refractive index of the fourth lens is in a range of 1.6 to 1.7.

7. An optical lens assembly according to claim 1, wherein said first lens has an abbe number in the range of 40 to 45, said second lens has an abbe number in the range of 40 to 45, said third lens has an abbe number in the range of 55 to 60, and said fourth lens has an abbe number in the range of 55 to 60.

8. A medical illumination device comprising a light source and the optical lens assembly of any one of claims 1 to 7.

9. The medical lighting device of claim 8, further comprising a barrel, the light source and the optical lens group being located within the barrel.

10. The medical lighting device of claim 8, wherein the light source comprises a light emitting diode.

Background

The PCR technology of polymerase chain reaction is characterized in that a proper temperature environment and raw materials are provided for self-replication of a double-helix structure of DNA in the outside, a reaction system summarizes that a specific DNA molecule grows in a number order after dozens of cycles of deformation → annealing → extension, and a large amount of target DNA molecules are generated. After PCR reaction, the molecular weight of DNA is amplified in million times, and then typing analysis can be realized through the chromogenic reaction of molecular hybridization, which is the function of the traditional PCR instrument.

The fluorescence quantitative PCR technology represents the PCR circulation process by monitoring the fluorescence signal intensity generated by adding a fluorescent group in a reaction system, and realizes the relative quantitative analysis of a detected object by measuring the fluorescence intensity of DNA molecules with known concentration gradient and drawing a standard curve. Compared with the traditional PCR, the fluorescent quantitative PCR has the characteristics of indicating pollution and false positive to the greatest extent, improving the detection sensitivity, and having high specificity, strong real-time property, strong universality and high accuracy.

As a fourth generation new light source, the light emitting diode LED has been widely used in various illumination fields due to its advantages of long life, firmness, durability, environmental protection, and the like. However, since the light emitting angle is relatively large, the intensity distribution of the light source is also similar to lambertian, and the light source cannot be directly used for illumination of various optical systems, and light energy needs to be redistributed. In the prior art, light distribution is generally carried out by adopting modes such as a parabolic reflector, an injection molding aspheric surface and a free-form surface lens, and the like, and the modes are difficult to popularize and utilize due to high cost of mold opening, processing and the like.

Disclosure of Invention

The embodiment of the invention provides an optical lens group and a medical lighting device, which aim to realize uniform distribution of light energy on a target image surface, and adopt a light distribution mode of a spherical glass lens group, so that the optical lens group has strong machinability and lower processing cost.

In a first aspect, an embodiment of the present invention provides an optical lens group for use in a medical lighting apparatus, the optical lens group including a first lens, a second lens, a third lens and a fourth lens, which are coaxially arranged in order from a light source to a target image plane;

the first lens, the second lens, the third lens and the fourth lens are meniscus convex lenses;

the first lens is provided with a first curved surface and a second curved surface, the second lens is provided with a third curved surface and a fourth curved surface, the third lens is provided with a fifth curved surface and a sixth curved surface, the fourth lens is provided with a seventh curved surface and an eighth curved surface, and the first curved surface, the second curved surface, the third curved surface and the fourth curved surface are all arranged in sequence and are all concave to one side of the light source; the fifth curved surface, the sixth curved surface, the seventh curved surface and the eighth curved surface are all spherical surfaces which are arranged in sequence and are all convex to one side of the light source.

Optionally, the radius of curvature of the first curved surface is-2.1 × (1 ± 5%) mm, and the radius of curvature of the second curved surface is-3.2 × (1 ± 5%) mm;

the radius of curvature of the third curved surface is-19 x (1 +/-5%) millimeters, and the radius of curvature of the fourth curved surface is-7 x (1 +/-5%) millimeters;

the curvature radius of the fifth curved surface is 20 x (1 +/-5%) millimeters, and the curvature radius of the sixth curved surface is 225 x (1 +/-5%) millimeters;

the curvature radius of the seventh curved surface is 10 x (1 +/-5%) mm, and the curvature radius of the eighth curved surface is 15 x (1 +/-5%) mm.

Optionally, the first lens has a center thickness of 2.9 × (1 ± 5%) millimeters;

the second lens has a center thickness of 2 x (1 ± 5%) millimeters;

the third lens has a center thickness of 3.1 x (1 ± 5%) millimeters;

the center thickness of the fourth lens was 3 × (1 ± 5%) millimeters.

Optionally, the distance between the second curved surface and the third curved surface is 0.3-0.5 mm; the distance between the fourth curved surface and the fifth curved surface is 0.1-0.3 mm; the distance between the sixth curved surface and the seventh curved surface is 0.4-0.6 mm.

Optionally, a distance between the second curved surface and the third curved surface is 0.4 mm; the distance between the fourth curved surface and the fifth curved surface is 0.2 mm; the distance between the sixth curved surface and the seventh curved surface is 0.5 mm.

Optionally, the refractive index range of the first lens is 1.8-1.9, the refractive index range of the second lens is 1.8-1.9, the refractive index range of the third lens is 1.6-1.7, and the refractive index range of the fourth lens is 1.6-1.7.

Optionally, the abbe number of the first lens is 40-45, the abbe number of the second lens is 40-45, the abbe number of the third lens is 55-60, and the abbe number of the fourth lens is 55-60.

In a second aspect, embodiments of the present invention further provide a medical illumination device, including a light source and the above optical lens group.

Optionally, the optical lens system further comprises a lens barrel, and the light source and the optical lens group are located in the lens barrel.

Optionally, the light source comprises a light emitting diode.

The optical lens group provided by the embodiment of the invention comprises a first lens, a second lens, a third lens and a fourth lens which are arranged coaxially in sequence from a light source to a target image surface; the first lens, the second lens, the third lens and the fourth lens are meniscus convex lenses; the first lens is provided with a first curved surface and a second curved surface, the second lens is provided with a third curved surface and a fourth curved surface, the third lens is provided with a fifth curved surface and a sixth curved surface, the fourth lens is provided with a seventh curved surface and an eighth curved surface, and the first curved surface, the second curved surface, the third curved surface and the fourth curved surface are all spherical surfaces which are sequentially arranged and are all concave to one side of the light source; the fifth curved surface, the sixth curved surface, the seventh curved surface and the eighth curved surface are all arranged in sequence in a spherical manner and are all convex to one side of the light source. The first lens to the fourth lens are meniscus convex lenses, so that the emergent light of the light source can be converged, and light spot energy is formed on a target image surface and is uniformly irradiated; the curved surfaces of all the lenses are spherical surfaces, so that the medical lens has the advantages of strong machinability and low processing cost, and the problem that uniform irradiation is needed in medical illumination is solved.

Drawings

FIG. 1 is a schematic structural diagram of an optical lens assembly according to an embodiment of the present invention;

fig. 2 and 3 are incoherent illumination graphs on an object image surface based on the optical lens group of fig. 1 respectively.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Fig. 1 is a schematic structural diagram of an optical lens assembly provided in an embodiment of the present invention, where the embodiment is applicable to a medical illumination device, and referring to fig. 1, the optical lens assembly provided in the embodiment includes a first lens 100, a second lens 200, a third lens 300, and a fourth lens 400 coaxially arranged in order from a light source to a target image plane; the first lens 100, the second lens 200, the third lens 300, and the fourth lens 400 are meniscus convex lenses; the first lens 100 is provided with a first curved surface 102 and a second curved surface 104, the second lens 200 is provided with a third curved surface 202 and a fourth curved surface 204, the third lens 300 is provided with a fifth curved surface 302 and a sixth curved surface 304, the fourth lens 400 is provided with a seventh curved surface 402 and an eighth curved surface 404, and the first curved surface 102, the second curved surface 104, the third curved surface 202 and the fourth curved surface 204 are all arranged in sequence in a spherical manner and are all concave to one side of the light source; the fifth curved surface 302, the sixth curved surface 304, the seventh curved surface 402 and the eighth curved surface 404 are all arranged in sequence in a spherical shape and are all convex to one side of the light source.

In this embodiment, the first lens 100, the second lens 200, the third lens 300, and the fourth lens 400 all adopt glass spherical lenses, and the glass spherical lenses are easy to process, which is beneficial to reducing the processing difficulty of the optical lens assembly and reducing the cost. The first lens 100 and the second lens 200 are meniscus lenses concave to the light source, and the third lens 300 and the fourth lens are meniscus lenses convex to the light source, so that the outgoing light of the light source is homogenized by matching the lenses with opposite directions.

According to the technical scheme of the embodiment, the first lens to the fourth lens are meniscus convex lenses, so that the light emitted by the light source can be converged, and the uniform irradiation of the energy of the light spot is formed on the target image surface; the curved surfaces of all the lenses are spherical surfaces, so that the medical lens has the advantages of strong machinability and low processing cost, and the problem that uniform irradiation is needed in medical illumination is solved.

On the basis of the above technical solution, optionally, the radius of curvature of the first curved surface 102 is-2.1 × (1 ± 5%) mm, and the radius of curvature of the second curved surface 104 is-3.2 × (1 ± 5%) mm; the radius of curvature of the third curved surface 202 is-19 x (1 ± 5%) mm, and the radius of curvature of the fourth curved surface 204 is-7 x (1 ± 5%) mm; the radius of curvature of the fifth curved surface 302 is 20 × (1 ± 5%) millimeters, and the radius of curvature of the sixth curved surface 304 is 225 × (1 ± 5%) millimeters; the radius of curvature of the seventh curved surface 402 is 10 × (1 ± 5%) mm, and the radius of curvature of the eighth curved surface 404 is 15 × (1 ± 5%) mm.

Optionally, the center thickness d1 of the first lens 100 is 2.9 × (1 ± 5%) millimeters; the center thickness d3 of the second lens 200 is 2 × (1 ± 5%) millimeters; the center thickness d5 of the third lens 300 is 3.1 × (1 ± 5%) millimeters; the center thickness d7 of the fourth lens 400 is 3 × (1 ± 5%) millimeters.

Optionally, the distance d2 between the second curved surface 104 and the third curved surface 202 is 0.3-0.5 mm; the distance d4 between the fourth curved surface 204 and the fifth curved surface 302 is 0.1-0.3 mm; the distance d6 between the sixth curved surface 304 and the seventh curved surface 402 is 0.4-0.6 mm. The distance d8 between the eighth curved surface 404 and the target image plane can be flexibly selected according to the area or brightness to be irradiated when the light uniformity satisfies the range.

Optionally, the distance d2 between the second curved surface 104 and the third curved surface 202 is 0.4 mm; the distance d4 between the fourth curved surface 204 and the fifth curved surface 302 is 0.2 mm; the distance d6 between the sixth curved surface 304 and the seventh curved surface 402 is 0.5 mm.

Optionally, the refractive index range of the first lens 100 is 1.8 to 1.9, the refractive index range of the second lens 200 is 1.8 to 1.9, the refractive index range of the third lens 300 is 1.6 to 1.7, and the refractive index range of the fourth lens 400 is 1.6 to 1.7.

Optionally, the abbe number of the first lens 100 is 40 to 45, the abbe number of the second lens 200 is 40 to 45, the abbe number of the third lens 300 is 55 to 60, and the abbe number of the fourth lens 400 is 55 to 60.

By arranging the first lens 100 to the fourth lens 400 to meet the above conditions, the light emitted by the light source can be uniformly distributed on the target image surface, and the requirements of medical illumination are met.

Exemplarily, fig. 2 and fig. 3 are incoherent illumination graphs on an object image plane based on the optical lens assembly of fig. 1, respectively, where fig. 2 shows the entire object image plane, fig. 3 shows an incoherent illumination graph corresponding to a certain fixed Y coordinate, and as can be seen from fig. 2 and fig. 3, the optical lens assembly provided by this embodiment has a good light-homogenizing effect.

The embodiment of the invention also provides a medical lighting device which comprises a light source and any one of the optical lens groups provided by the embodiment.

The medical lighting device provided by the embodiment of the invention comprises any one optical lens group provided by the above embodiment, and has the same or corresponding technical effects. In specific implementation, the detector can be prevented at the position of the target image surface and is used for detecting the light spot energy distribution of the target surface.

Optionally, in an embodiment, the medical lighting device further includes a lens barrel, and the light source and the optical lens group are located in the lens barrel, so as to improve stability of each lens. Optionally, the light source includes a light emitting diode LED, and the type of the LED may be selected according to an actual scene in specific implementation, which is not limited in the embodiment of the present invention.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.