Optical lens assembly and medical lighting device

Abstract

The embodiment of the present invention discloses an optical lens group and a medical lighting device. The optical lens group includes a first lens, a second lens, a third lens and a fourth lens arranged in sequence on the same optical axis from the light source to the target image plane; the first lens, the second lens, the third lens and the fourth lens are all meniscus convex lenses; the first lens has a first curved surface and a second curved surface, the second lens has a third curved surface and a fourth curved surface, the third lens has a fifth curved surface and a sixth curved surface, the fourth lens has a seventh curved surface and an eighth curved surface, the first curved surface, the second curved surface, the third curved surface and the fourth curved surface are all spherical surfaces 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 arranged in sequence, and are all convex to one side of the light source. The technical solution of the embodiment of the present invention can achieve uniform distribution of light energy on the target image plane, and adopts the light distribution method of the spherical glass lens group, which has strong processability and low processing cost.

Description

Technical Field

[0001] The embodiments of the present invention relate to optical technology, and in particular to an optical lens assembly and a medical lighting device. Background Art

[0002] Polymerase chain reaction (PCR) technology refers to providing a suitable temperature environment and raw materials for the self-replication of the double helix structure of DNA in the outside world. The reaction system aggregates specific DNA molecules through dozens of cycles of deformation, annealing, and extension, and then grows exponentially, producing a large number of target DNA molecules. After the PCR reaction, the molecular weight of DNA is amplified by millions of times, and then the color reaction of molecular hybridization can be used to achieve typing analysis. This is the role of traditional PCR instruments.

[0003] The fluorescence quantitative PCR technology relies on monitoring the intensity of the fluorescence signal generated by adding fluorescent groups to the reaction system to characterize the PCR cycle process, and draws a standard curve by measuring the fluorescence intensity of DNA molecules with known concentration gradients to achieve relative quantitative analysis of the detected object. Compared with traditional PCR, fluorescence quantitative PCR can most likely indicate contamination and false positives, improve detection sensitivity, and has the characteristics of high specificity, strong real-time performance, strong versatility, and high accuracy.

[0004] As the fourth generation of new light sources, light emitting diodes (LEDs) have been widely used in various lighting fields due to their many advantages such as long life, durability, and environmental protection. However, due to their relatively large light emission angle and the light source intensity distribution similar to the Lambertian type, they cannot be directly used for the lighting of various optical systems, and the light energy needs to be redistributed. In the prior art, parabolic reflectors, injection molded aspheric surfaces, free-form lenses, etc. are generally used for light distribution, which are difficult to promote and utilize due to the high costs of mold opening and processing. Summary of the invention

[0005] The embodiments of the present invention provide an optical lens group and a medical lighting device to achieve uniform distribution of light energy on a target image plane, and adopt a light distribution method of a spherical glass lens group, which has strong processability and low processing cost.

[0006] In a first aspect, an embodiment of the present invention provides an optical lens assembly for use in a medical lighting device, wherein the optical lens assembly comprises a first lens, a second lens, a third lens, and a fourth lens which are arranged in sequence on a coaxial axis from a light source to a target image plane;

[0007] The first lens, the second lens, the third lens and the fourth lens are all meniscus convex lenses;

[0008] The first lens has a first curved surface and a second curved surface, the second lens has a third curved surface and a fourth curved surface, the third lens has a fifth curved surface and a sixth curved surface, the fourth lens has a seventh curved surface and an eighth curved surface, the first curved surface, the second curved surface, the third curved surface and the fourth curved surface are all spherical surfaces arranged in sequence, and are all concave toward the 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 arranged in sequence, and are all convex toward the side of the light source.

[0009] 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;

[0010] The radius of curvature of the third curved surface is -19×(1±5%) mm, and the radius of curvature of the fourth curved surface is -7×(1±5%) mm;

[0011] The curvature radius of the fifth curved surface is 20×(1±5%) mm, and the curvature radius of the sixth curved surface is 225×(1±5%) mm;

[0012] The curvature radius of the seventh curved surface is 10×(1±5%) mm, and the curvature radius of the eighth curved surface is 15×(1±5%) mm.

[0013] Optionally, the center thickness of the first lens is 2.9×(1±5%) mm;

[0014] The central thickness of the second lens is 2×(1±5%) mm;

[0015] The central thickness of the third lens is 3.1×(1±5%) mm;

[0016] The central thickness of the fourth lens is 3×(1±5%) mm.

[0017] Optionally, the distance between the second curved surface and the third curved surface is 0.3 to 0.5 mm; the distance between the fourth curved surface and the fifth curved surface is 0.1 to 0.3 mm; and the distance between the sixth curved surface and the seventh curved surface is 0.4 to 0.6 mm.

[0018] Optionally, the spacing between the second curved surface and the third curved surface is 0.4 mm; the spacing between the fourth curved surface and the fifth curved surface is 0.2 mm; and the spacing between the sixth curved surface and the seventh curved surface is 0.5 mm.

[0019] Optionally, the refractive index of the first lens is in the range of 1.8 to 1.9, the refractive index of the second lens is in the range of 1.8 to 1.9, the refractive index of the third lens is in the range of 1.6 to 1.7, and the refractive index of the fourth lens is in the range of 1.6 to 1.7.

[0020] Optionally, the Abbe number of the first lens is in the range of 40 to 45, the Abbe number of the second lens is in the range of 40 to 45, the Abbe number of the third lens is in the range of 55 to 60, and the Abbe number of the fourth lens is in the range of 55 to 60.

[0021] In a second aspect, an embodiment of the present invention further provides a medical lighting device, comprising a light source and the above-mentioned optical lens group.

[0022] Optionally, a lens barrel is further included, and the light source and the optical lens group are located in the lens barrel.

[0023] Optionally, the light source includes a light emitting diode.

[0024] The optical lens group provided by the embodiment of the present invention includes a first lens, a second lens, a third lens and a fourth lens arranged in sequence on the same optical axis from the light source to the target image plane; the first lens, the second lens, the third lens and the fourth lens are all meniscus convex lenses; the first lens has a first curved surface and a second curved surface, the second lens has a third curved surface and a fourth curved surface, the third lens has a fifth curved surface and a sixth curved surface, and the fourth lens has 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 arranged in sequence, and are all concave toward 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 arranged in sequence, and are all convex toward one side of the light source. By setting the first lens to the fourth lens to be all meniscus convex lenses, the convergence of the light emitted by the light source can be achieved, and the light spot energy is formed on the target image plane for uniform irradiation; by setting the curved surfaces of all lenses to be spherical surfaces, it has the advantages of strong processability and low processing cost, and solves the problem of uniform irradiation in medical lighting. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of an optical lens assembly provided by an embodiment of the present invention;

[0026] Figure 2 and Figure 3 Based on Figure 1 Incoherent illumination diagram of the optical lens group on the target image plane. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0028] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. It should be noted that the directional words such as "upper", "lower", "left", "right" and the like described in the embodiments of the present invention are described at the angles shown in the accompanying drawings and should not be understood as limitations on the embodiments of the present invention. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is formed "on" or "under" another element, it can not only be directly formed "on" or "under" another element, but also indirectly formed "on" or "under" another element through an intermediate element. The terms "first", "second" and the like are only used for descriptive purposes and do not indicate any order, quantity or importance, but are only used to distinguish different components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0029] Figure 1 This is a schematic diagram of the structure of an optical lens group provided in an embodiment of the present invention. This embodiment can be applied to a medical lighting device. Figure 1 The optical lens group provided in this embodiment includes a first lens 100, a second lens 200, a third lens 300 and a fourth lens 400 which are arranged in sequence on a coaxial axis 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 all meniscus convex lenses; the first lens 100 has a first curved surface 102 and a second curved surface 104, the second lens 200 has a third curved surface 202 and a fourth curved surface 204, the third lens 300 has a fifth curved surface 302 and a sixth curved surface 304, the fourth lens 400 has a seventh curved surface 402 and an eighth curved surface 404, the first curved surface 102, the second curved surface 104, the third curved surface 202 and the fourth curved surface 204 are all spherical surfaces arranged in sequence, and are all concave toward the 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 spherical surfaces arranged in sequence, and are all convex toward the side of the light source.

[0030] In this embodiment, the first lens 100, the second lens 200, the third lens 300 and the fourth lens 400 are all glass spherical lenses. Glass spherical surfaces are easy to process, which is conducive to reducing the difficulty of processing the optical lens group and reducing costs. The first lens 100 and the second lens 200 are meniscus lenses concave toward the light source, and the third lens 300 and the fourth lens are meniscus lenses convex toward the light source, so that the lenses facing opposite directions are used to achieve uniformity of the light emitted by the light source.

[0031] The technical solution of this embodiment, by setting the first lens to the fourth lens to be meniscus convex lenses, can realize the convergence of the light emitted by the light source, and form a light spot on the target image plane for uniform irradiation of energy; by setting the curved surfaces of all lenses to be spherical surfaces, it has the advantages of strong machinability and low processing cost, and solves the problem of uniform illumination in medical lighting.

[0032] 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×(1±5%) mm, and the radius of curvature of the fourth curved surface 204 is -7×(1±5%) mm; the radius of curvature of the fifth curved surface 302 is 20×(1±5%) mm, and the radius of curvature of the sixth curved surface 304 is 225×(1±5%) mm; 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.

[0033] Optionally, the center thickness d1 of the first lens 100 is 2.9×(1±5%) mm; the center thickness d3 of the second lens 200 is 2×(1±5%) mm; the center thickness d5 of the third lens 300 is 3.1×(1±5%) mm; and the center thickness d7 of the fourth lens 400 is 3×(1±5%) mm.

[0034] Optionally, the spacing d2 between the second curved surface 104 and the third curved surface 202 is 0.3-0.5 mm; the spacing d4 between the fourth curved surface 204 and the fifth curved surface 302 is 0.1-0.3 mm; the spacing d6 between the sixth curved surface 304 and the seventh curved surface 402 is 0.4-0.6 mm. The spacing d8 between the eighth curved surface 404 and the target image plane can be flexibly selected according to the area or brightness required to be illuminated when the light uniformity meets the range.

[0035] 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; and the distance d6 between the sixth curved surface 304 and the seventh curved surface 402 is 0.5 mm.

[0036] Optionally, the refractive index of the first lens 100 is in the range of 1.8 to 1.9, the refractive index of the second lens 200 is in the range of 1.8 to 1.9, the refractive index of the third lens 300 is in the range of 1.6 to 1.7, and the refractive index of the fourth lens 400 is in the range of 1.6 to 1.7.

[0037] Optionally, the Abbe number of the first lens 100 is in the range of 40-45, the Abbe number of the second lens 200 is in the range of 40-45, the Abbe number of the third lens 300 is in the range of 55-60, and the Abbe number of the fourth lens 400 is in the range of 55-60.

[0038] 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 evenly distributed on the target image plane, thereby meeting the requirements of medical lighting.

[0039] For example, Figure 2 and Figure 3 Based on Figure 1 The incoherent illumination diagram of the optical lens group on the target image plane, where Figure 2 The entire target image is shown. Figure 3 The incoherent illumination diagram corresponding to a fixed Y coordinate is shown in Figure 2 and Figure 3 It can be seen that the optical lens assembly provided in this embodiment has a good light homogenization effect.

[0040] An embodiment of the present invention further provides a medical lighting device, comprising a light source and any one of the optical lens groups provided in the above embodiments.

[0041] Since the medical lighting device provided by the embodiment of the present invention includes any one of the optical lens groups provided by the above embodiments, it has the same or corresponding technical effects. In specific implementation, a detector can be placed at the position of the target image plane to detect the spot energy distribution on the target surface.

[0042] Optionally, in a certain embodiment, the medical lighting device further comprises a lens barrel, and the light source and the optical lens group are located in the lens barrel, so as to improve the stability of each lens. Optionally, the light source comprises a light emitting diode LED, and the type of LED can be selected according to the actual scene during specific implementation, and the embodiment of the present invention is not limited to this.

[0043] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An optical lens assembly, characterized in that: Used in a medical lighting device, the optical lens group consists of a first lens, a second lens, a third lens and a fourth lens which are arranged in sequence on the same optical axis from a light source to a target image plane; The first lens, the second lens, the third lens and the fourth lens are all positive lenses, and are all meniscus convex lenses; The first lens has a first curved surface and a second curved surface, the second lens has a third curved surface and a fourth curved surface, the third lens has a fifth curved surface and a sixth curved surface, the fourth lens has a seventh curved surface and an eighth curved surface, the first curved surface, the second curved surface, the third curved surface and the fourth curved surface are all spherical surfaces arranged in sequence, and are all concave toward the 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 arranged in sequence, and are all convex toward the side of the light source; 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×(1±5%) mm, and the radius of curvature of the fourth curved surface is -7×(1±5%) mm; the radius of curvature of the fifth curved surface is 20×(1±5%) mm, and the radius of curvature of the sixth curved surface is 225×(1±5%) mm; the radius of curvature of the seventh curved surface is 10×(1±5%) mm, and the radius of curvature of the eighth curved surface is 15×(1±5%) mm; 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.

2. The optical lens assembly according to claim 1, characterized in that: The center thickness of the first lens is 2.9×(1±5%) mm; The center thickness of the second lens is 2×(1±5%) mm; The central thickness of the third lens is 3.1×(1±5%) mm; The central thickness of the fourth lens is 3×(1±5%) mm.

3. The optical lens assembly according to claim 1, characterized in that: The 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; and the distance between the sixth curved surface and the seventh curved surface is 0.5 mm.

4. The optical lens assembly according to claim 1, characterized in that: The refractive index of the first lens is in the range of 1.8 to 1.9, the refractive index of the second lens is in the range of 1.8 to 1.9, the refractive index of the third lens is in the range of 1.6 to 1.7, and the refractive index of the fourth lens is in the range of 1.6 to 1.

7.

5. The optical lens assembly according to claim 1, characterized in that: The Abbe number of the first lens is in the range of 40 to 45, the Abbe number of the second lens is in the range of 40 to 45, the Abbe number of the third lens is in the range of 55 to 60, and the Abbe number of the fourth lens is in the range of 55 to 60.

6. A medical lighting device, characterized in that: It comprises a light source and the optical lens assembly described in any one of claims 1 to 5.

7. The medical lighting device according to claim 6, characterized in that: It also includes a lens barrel, in which the light source and the optical lens group are located.

8. The medical lighting device according to claim 7, characterized in that: The light source includes a light emitting diode.

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