Large cone angle microscope for detection
By designing a large cone-angle microscope and employing four sets of double-cemented lens groups and lens optimization, the problem of insufficient resolution of existing lenses was solved, achieving high-precision detection and observation of 1 micrometer.
Patent Information
- Application Number
- CN202520181888.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-06
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-02-06
AI Technical Summary
Existing detection lenses have a cone angle between 1° and 2° and a resolution of more than 20 micrometers, which cannot be used for industrial measurements below 20 micrometers or biological cell observations of 10 micrometers.
A large cone angle microscope was designed, employing four sets of cemented doublet lenses. The lens materials and curvature parameters were optimized, and the combined focal length and optical characteristics were adjusted to achieve a half cone angle of 17° and a resolution of 1 micrometer.
It achieves high-precision industrial detection and biological observation with a resolution of 1 micrometer, meeting the measurement requirements below 20 micrometers.
Smart Images
Figure CN223911121U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of microscope, in particular to a big taper angle microscope for detection. BACKGROUND
[0002] The double telecentric lens is a kind of special design optical imaging system, mainly used for precision measurement and imaging application, and its core design is to set a diaphragm in the lens, aperture diaphragm or field diaphragm, so that the light emitted from the surface of the object is adjusted to be approximately parallel when passing through the lens, whether entering or leaving the lens.
[0003] In the detection lens, the greater the taper angle, the greater the numerical aperture, and the higher the resolution, the taper angle of the double telecentric lens for detection on the market is between 1 ° and 2 °, and the resolution is more than 20 microns, which cannot be used for industrial measurement below 20 microns, and cannot be used for observing biological cells with a size of 10 microns, so there is a certain defect. UTILITY MODEL CONTENT
[0004] The utility model discloses a big taper angle microscope for detection, to solve the problem in the background art.
[0005] To achieve the above object, the utility model provides the following technical scheme: a big taper angle microscope for detection, comprising:
[0006] Double cemented lens group G1, the double cemented lens group G1 is cemented by lens L1 and lens L2;
[0007] Double cemented lens group G2, the double cemented lens group G2 is cemented by lens L3 and lens L4;
[0008] Double cemented lens group G3, the double cemented lens group G3 is cemented by lens L5 and lens L6;
[0009] Double cemented lens group G4, the double cemented lens group G4 is cemented by lens L7 and lens L8, and the double cemented lens group G1, double cemented lens group G2, double cemented lens group G3 and double cemented lens group G4 are sequentially arranged along the light propagation direction.
[0010] Preferably, the lens L1 is a positive focal power lenticular lens, the light incidence convex curvature is 0.05 < p1 < 0.06, the light emission concave curvature is 0.08 < p2 < 0.1, the refractive index of the lens L1 is 1.68 < n < 1.73, and the Abbe number of the lens L1 is 52 < v < 54.
[0011] Preferably, the lens L2 is a negative power meniscus thin lens, the concave and convex curvatures along the light propagation direction are 0.08 < p1 < 0.1 and 0.05 < p2 < 0.06, the refractive index of the lens L2 is 1.8 < n < 1.85, and the Abbe number of the lens L2 is 35 < v < 37.
[0012] Preferably, the lens L3 is a positive power lenticular lens, the first convex surface is a light incident surface with a curvature of 0.036 < p1 < 0.41, the second convex surface is a light exit surface with a curvature of 0.07 < p2 < 0.08, the refractive index of the lens L3 is 1.7 < n < 1.73, and the Abbe number of the lens L3 is 52.5 < v < 55.
[0013] Preferably, the lens L4 is a negative power double-concave lens, the curvatures along the light propagation direction are 0.070 < p2 < 0.085 and 0.2 < p2 < 0.3 in sequence, the refractive index of the lens L4 is 1.8 < n < 1.85, and the Abbe number of the lens L4 is 36 < v < 3.
[0014] Preferably, the lens L5 is a positive power lens, the convex surface is a light incident surface with a curvature of 0.15 < p1 < 0.17, the concave surface is a light exit surface with a curvature of 0.02 < p2 < 0.03, the refractive index of the lens L5 is 1.65 < n < 1.70, and the Abbe number of the lens L5 is 52 < v < 53.
[0015] Preferably, the lens L6 is a negative power meniscus lens, the convex curvature along the light propagation direction is 0.02 < p2 < 0.03, and the concave curvature is 0.2 < p2 < 0.25, the refractive index of the lens L6 is 1.82 < n < 1.91, and the Abbe number of the lens L6 is 35.5 < v < 37.
[0016] Preferably, the lens L7 is a positive power lenticular lens, the curvatures along the light propagation direction are 0.06 < p1 < 0.07 and 0.07 < p2 < 0.09 in sequence, the refractive index of the lens L7 is 1.65 < n < 1.70, and the Abbe number of the lens L7 is 52 < v < 53.
[0017] Preferably, the lens L8 is a meniscus negative lens, the concave surface is a light incident surface with a curvature of 0.07 < p2 < 0.09, the convex surface is a light exit surface with a curvature of 0.01 < p2 < 0.02, the refractive index of the lens L8 is 1.82 < n < 1.91, and the Abbe number of the lens L8 is 35.5 < v < 37.
[0018] The technical effects and advantages of the utility model are as follows:
[0019] The utility model discloses a big taper angle microscope for detecting, including double cemented lens group G1, double cemented lens group G2, double cemented lens group G3 and double cemented lens group G4, double cemented lens group G1 is glued together by lens L1 and lens L2, double cemented lens group G2 is glued together by lens L3 and lens L4, double cemented lens group G3 is glued together by lens L5 and lens L6, double cemented lens group G4 is glued together by lens L7 and lens L8, and double cemented lens group G1, double cemented lens group G2, double cemented lens group G3 and double cemented lens group G4 are sequentially arranged along the light propagation direction, and its working distance is 32mm, object height is 5mm, and half taper angle is 17°, because the bigger taper angle is, the higher resolution is, and the resolution can reach 1 microns, so the microscope can realize high-precision industrial detection and biological field observation. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 It is big taper angle microscope structure schematic diagram of the utility model.
[0021] Figure 2 It is big taper angle microscope optical structure schematic diagram of the utility model.
[0022] Figure 3 It is big taper angle microscope optical path diagram of the utility model.
[0023] Figure 4 It is big taper angle microscope transfer function diagram of the utility model.
[0024] Figure 5 It is big taper angle microscope point list diagram of the utility model.
[0025] Figure 6 It is big taper angle microscope astigmatism, field curvature, distortion diagram of the utility model. DETAILED DESCRIPTION
[0026] The technical scheme in the embodiments of the utility model will be apparently and completely described below with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative work belong to the scope of protection of the utility model.
[0027] The utility model provides a big taper angle microscope for detecting as Figures 1-6 shown in a kind of, including double cemented lens group G1, double cemented lens group G2, double cemented lens group G3 and double cemented lens group G4, double cemented lens group G1 is glued together by lens L1 and lens L2, double cemented lens group G2 is glued together by lens L3 and lens L4, double cemented lens group G3 is glued together by lens L5 and lens L6, double cemented lens group G4 is glued together by lens L7 and lens L8, and double cemented lens group G1, double cemented lens group G2, double cemented lens group G3 and double cemented lens group G4 are sequentially arranged along the light propagation direction, as Figure 4 、 Figure 5 And Figure 6The shown are, respectively, a large cone angle microscope transfer function diagram, a large cone angle microscope point column diagram, and a large cone angle microscope astigmatism, field curvature, distortion diagram.
[0028] Further, the lens L1 is a positive power double convex lens, the light incident convex curvature is 0.05 < p1 < 0.06, the light exit concave curvature is 0.08 < p2 < 0.1, the lens L1 material is a special crown glass with high refractive index and low Abbe number, the lens L1 refractive index is 1.68 < n < 1.73, the lens L1 Abbe number is 52 < v < 54, the lens L2 is a negative power meniscus thin lens, the concave and convex curvatures along the light propagation direction are 0.08 < p1 < 0.1 and 0.05 < p2 < 0.06, the lens L2 material is a special flint glass with high refractive index and low Abbe number, the lens L2 refractive index is 1.8 < n < 1.85, the lens L2 Abbe number is 35 < v < 37, the double cemented lens group G1 cemented by the lens L1 and the lens L2 has a positive combined focal length, corrects chromatic aberration and spherical aberration, reduces the light ray divergence angle incident to the system, reduces the exit light height, folds the object side chief ray to the optical axis, and realizes the large cone angle design.
[0029] Further, the lens L3 is a positive power double convex lens, the first convex surface of the lens L3 is a light incident surface with a curvature of 0.036 < p1 < 0.41, the second convex surface of the lens L3 is a light exit surface with a curvature of 0.07 < p2 < 0.08, the lens L3 material is a special crown glass with high refractive index and low Abbe number, the lens L3 refractive index is 1.7 < n < 1.73, the lens L3 Abbe number is 52.5 < v < 55, the lens L4 is a negative power double concave lens, the curvatures along the light propagation direction are 0.070 < p2 < 0.085 and 0.2 < p2 < 0.3, the lens L4 material is a special flint glass with high refractive index and low Abbe number, the lens L4 refractive index is 1.8 < n < 1.85, the lens L4 Abbe number is 36 < v < 3, the double cemented lens group G2 cemented by the lens L3 and the lens L4 has a negative combined focal length, and forms a fixed lens group with the double cemented lens group G1, so that the aberration is adjusted, the coma, distortion and magnification chromatic aberration are effectively corrected, the light ray divergence angle is further reduced, the light exit height is reduced, and the lens barrel aperture is reduced.
[0030] In particular, the lens L5 is a positive power lens, the convex surface is a light incident surface with a curvature of 0.15 < p1 < 0.17, the concave surface is a light exit surface with a curvature of 0.02 < p2 < 0.03, the lens L5 is made of a special crown glass with high refractive index and low Abbe number, the refractive index of the lens L5 is 1.65 < n < 1.70, the Abbe number of the lens L5 is 52 < v < 53, the lens L6 is a negative power meniscus lens, the convex surface has a curvature of 0.02 < p2 < 0.03 along the light propagation direction, and the concave surface has a curvature of 0.2 < p2 < 0.25, the lens L6 is made of flint glass with high refractive index and low Abbe number, the refractive index of the lens L6 is 1.82 < n < 1.91, and the Abbe number of the lens L6 is 35.5 < v < 37, the double cemented lens group G3 formed by cementing the lens L5 and the lens L6 is an adjusting lens group, the combined focal length is negative, the spherical aberration and the chromatic aberration are further corrected, the light rays are diverged to increase the optical path, and the double cemented lens group G3 can be finely adjusted by 0-1.5mm in front and back directions to focus, so that the imaging is clearer.
[0031] Further, the lens L7 is a positive power double convex lens, the curvatures along the light propagation direction are 0.06 < p1 < 0.07 and 0.07 < p2 < 0.09 in sequence, the lens L7 is made of a special crown glass with high refractive index and low Abbe number, the refractive index of the lens L7 is 1.65 < n < 1.70, the Abbe number of the lens L7 is 52 < v < 53, the lens L8 is a meniscus negative lens, the concave surface is a light incident surface with a curvature of 0.07 < p2 < 0.09, and the convex surface is a light exit surface with a curvature of 0.01 < p2 < 0.02, the lens L8 is made of flint glass with high refractive index and low Abbe number, the refractive index of the lens L8 is 1.82 < n < 1.91, and the Abbe number of the lens L8 is 35.5 < v < 37, the double cemented lens group G4 formed by cementing the lens L7 and the lens L8 is a telecentric lens group, the combined focal length is negative, the double cemented lens group G4 cooperates with the adjusting lens group double cemented lens group G3 to correct the coma and the distortion, the light rays are diverged, the exit chief ray is parallel to the optical axis, a large focal depth and small distortion are provided for the image side, and the measurement data is ensured to be accurate.
[0032] Finally, it should be noted that the above only describes preferred embodiments of the present application and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement for some technical features, and any modification, equivalent replacement or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A large cone angle microscope for detection, characterized in that, Comprising: a double cemented lens group G1 cemented from a lens L1 and a lens L2, the lens L1 being a positive power lenticular lens with a convex curvature of light entrance , a concave curvature of light exit , a refractive index of 1.68 < n < 1.73, an Abbe number of 52 < v < 54, the lens L2 being a negative power meniscus thin lens with a concave curvature and a convex curvature along the light propagation direction of and , a refractive index of 1.8 < n < 1.85, an Abbe number of 35 < v < 37; A double cemented lens group G2 is formed by cementing together a lens L3 and a lens L4, the lens L3 being a positive power double convex lens, the first convex surface of the lens L3 being a light ray entrance surface with a curvature of , the second convex surface of the lens L3 being a light ray exit surface with a curvature of , the refractive index of the lens L3 being 1.7 < n < 1.73, the Abbe number of the lens L3 being 52.5 < v < 55, the lens L4 being a negative power double concave lens with curvatures in the order of light ray propagation direction being: and , the refractive index of the lens L4 being 1.8 < n < 1.85, the Abbe number of the lens L4 being 36 < v < 3; a double cemented lens group G3 cemented from a lens L5 and a lens L6, the lens L5 being a positive power lens, the convex surface being a light ray entrance surface with a curvature of , the concave surface being a light ray exit surface with a curvature of , the lens L5 having a refractive index of 1.65 < n < 1.70 and an Abbe number of 52 < v < 53, the lens L6 being a negative power meniscus lens, the convex surface having a curvature of , the concave surface having a curvature of , the lens L6 having a refractive index of 1.82 < n < 1.91 and an Abbe number of 35.5 < v < 37; A double cemented lens group G4 is formed by cementing together a lens L7 and a lens L8, the double cemented lens group G1, double cemented lens group G2, double cemented lens group G3 and double cemented lens group G4 are arranged in order along the direction of light propagation, the lens L7 is a positive power lenticular lens, the curvatures along the direction of light propagation are in order: and , the lens L7 has a refractive index of 1.65 < n < 1.70, the lens L7 has an Abbe number of 52 < v < 53, the lens L8 is a meniscus negative lens, the concave surface is the light incident surface with a curvature of , the convex surface is the light exit surface with a curvature of , the lens L8 has a refractive index of 1.82 < n < 1.91, and the lens L8 has an Abbe number of 35.5 < v < 37.