95mm parfocal length five-time high-resolution large-view flat-field apochromatic microscope objective
By designing a combination of aperture stops and optical components, the problem of traditional microscope objectives being incompatible with CMOS image sensors has been solved, resulting in a high-resolution microscope objective with a large field of view, suitable for video inspection.
Patent Information
- Application Number
- CN202511659215.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-13
- Publication Date
- 2025-12-26
AI Technical Summary
Traditional 95mm parfocal-length plan apochromatic microscope objectives are incompatible with the small pixel size and large target area requirements of the latest CMOS image sensors, resulting in insufficient resolution and field of view.
A microscope objective lens comprising an aperture stop, a first optical component, and a second optical component was designed. By combining cemented lenses and single lenses, it provides positive optical power and corrects spherical aberration and chromatic aberration, meets specific refractive index and Abbe number requirements, and achieves high resolution and a large field of view.
It achieves high resolution and a wide field of view in microscope objectives, and is compatible with full-frame CMOS image sensors, improving video detection speed.
Smart Images
Figure CN121209079A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to optical instrument lens, specifically to a 95mm focal length 5 times high resolution large field of view flat field apochromatic microscope objective. BACKGROUND
[0002] Flat field apochromatic microscope objective has a very wide range of applications in visual observation and video detection fields.
[0003] In the field of video detection, CMOS detector technology is developing towards smaller pixel size and larger target surface, and the resolution and field number of the traditional 95mm focal length flat field apochromatic microscope objective cannot be compatible with the latest CMOS image sensor. SUMMARY
[0004] In view of the deficiencies of the prior art, the technical problem to be solved by the present application is to provide a 95mm focal length 5 times high resolution large field of view flat field apochromatic microscope objective with higher resolution and larger field number.
[0005] The 95mm focal length 5 times high resolution large field of view flat field apochromatic microscope objective which can solve the problems of the prior art has the technical scheme that:
[0006] 1. It comprises an aperture diaphragm, a first optical assembly G1 and a second optical assembly G2 arranged in order along the optical axis from an infinite image plane M to an object plane N, the first optical assembly G1 is used to provide positive focal power and correct the field curvature of the optical system, and the second optical assembly G2 is used to provide positive focal power and correct the spherical aberration and chromatic aberration of the optical system.
[0007] 2. The effective focal length of the microscope objective is 95mm, The effective focal length of the first optical assembly G1 is 50mm, The effective focal length of the second optical assembly G2 is 20mm, and it satisfies: 1 <2, 4 <6.
[0008] Further settings are:
[0009] 1. The first optical assembly G1 comprises cemented lens I, cemented lens II, single lens I and single lens II. The cemented lens I is cemented by meniscus lens I and meniscus lens II, and the curvature radius of three surfaces of the cemented lens I is R1>0, R2>0, R3>0 respectively; the cemented lens II is cemented by double concave lens I and double convex lens I, and the curvature radius of three surfaces of the cemented lens II is R4<0, R5>0, R6<0 respectively; the single lens I is double convex lens II, and the curvature radius of two surfaces of the double convex lens II is R7>0, R8<0 respectively; the single lens II is double convex lens III, and the curvature radius of two surfaces of the double convex lens III is R9>0, R10<0 respectively.
[0010] 2. The second optical assembly G2 comprises cemented lens III and cemented lens IV, the cemented lens III is cemented by double convex lens IV and double concave lens II, and the curvature radius of three surfaces of the cemented lens III is R11>0, R12<0, R13>0 respectively; the cemented lens IV is cemented by meniscus lens III and double convex lens V, and the curvature radius of three surfaces of the cemented lens IV is R14>0, R15>0, R16<0 respectively.
[0011] Further settings are:
[0012] 1. The refractive index and Abbe number of the meniscus lens I satisfy The refractive index and Abbe number of the meniscus lens II satisfy The refractive index and Abbe number of the double concave lens I satisfy The refractive index and Abbe number of the double convex lens I satisfy The refractive index and Abbe number of the single lens I satisfy The refractive index and Abbe number of the single lens II satisfy .
[0013] 2. The refractive index and Abbe number of the double convex lens IV satisfy The refractive index and Abbe number of the double concave lens II satisfy The refractive index and Abbe number of the meniscus lens III satisfy The refractive index and Abbe number of the double convex lens V satisfy .
[0014] The parfocal distance of the microscope objective is 95mm, the working wavelength range is 436nm-656nm, the numerical aperture is 0.27, the matched focal distance is 200mm, the tube lens is used, the field number is 44, and the free working distance is greater than 20mm.
[0015] The beneficial effects of the present application are:
[0016] The 95mm equifocal 5x high-resolution large-field flat-field complex achromatic microscope objective of the present application has high numerical aperture, large imaging field, and can be compatible with full-frame CMOS image sensors, and can greatly improve the detection speed in the field of video detection. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 The structure schematic diagram of one embodiment of the present application.
[0018] Figure 2 The structure schematic diagram of one embodiment of the present application. Figure 1 The position schematic diagram of the curvature radius of each lens in the embodiment.
[0019] Figure 3 The position schematic diagram of the curvature radius of each lens in the embodiment. Figure 1 The spherical aberration and chromatic aberration curve diagram in the embodiment.
[0020] Figure 4 The spherical aberration and chromatic aberration curve diagram in the embodiment. Figure 1 The astigmatism and field curvature curve diagram in the embodiment.
[0021] Figure 5 The astigmatism and field curvature curve diagram in the embodiment. Figure 1 The RMS wavefront error curve diagram in the embodiment.
[0022] Figure number identification: 1, aperture diaphragm; 2, cemented lens I; 2-1, meniscus lens I; 2-2, meniscus lens II; 3, cemented lens II; 3-1, biconcave lens I; 3-2, biconvex lens I; 4, single lens I; 5, single lens II; 6, cemented lens III; 6-1, biconvex lens IV; 6-2, biconcave lens II; 7, cemented lens IV; 7-1, meniscus lens III; 7-2, biconvex lens V. DETAILED DESCRIPTION
[0023] The technical solutions of the present application will be further described below in combination with the embodiments shown in the drawings.
[0024] The 95mm equifocal 5x high-resolution large-field flat-field complex achromatic microscope objective of the present application has high numerical aperture, large imaging field, and can be compatible with full-frame CMOS image sensors, and can greatly improve the detection speed in the field of video detection. Figure 1 The 95mm equifocal 5x high-resolution large-field flat-field complex achromatic microscope objective of the present application has high numerical aperture, large imaging field, and can be compatible with full-frame CMOS image sensors, and can greatly improve the detection speed in the field of video detection.
[0025] The effective focal length of the microscope objective of the present application is , the effective focal length of the first optical assembly G1 is , the effective focal length of the second optical assembly G2 is , and satisfies: 1 < 2, 4 < 6.
[0026] The first optical assembly G1 comprises, from the infinite image plane M to the object plane N and along the optical axis, cemented lens I2, cemented lens II 3, single lens I 4 and single lens II 5. The cemented lens I2 comprises cemented meniscus lens I 2-1 (left side) and meniscus lens II 2-2 (right side), and the radii of curvature of the three surfaces of the cemented lens I2 from left to right are R1>0, R2>0, R3>0 respectively; the cemented lens II 3 comprises cemented double concave lens I 3-1 (left side) and double convex lens I 3-2 (right side), and the radii of curvature of the three surfaces of the cemented lens II 3 from left to right are R4<0, R5>0, R6<0 respectively; the single lens I 4 is double convex lens II, and the radii of curvature of the two surfaces of the single lens I 4 from left to right are R7>0, R8<0 respectively; the single lens II 5 is double convex lens III, and the radii of curvature of the two surfaces of the single lens II 5 from left to right are R9>0, R10<0 respectively, as shown in Figure 1 , Figure 2 .
[0027] The refractive index and Abbe number of the meniscus lens I 2-1 satisfy , the refractive index and Abbe number of the meniscus lens II 2-2 satisfy , the refractive index and Abbe number of the double concave lens I 3-1 satisfy , the refractive index and Abbe number of the double convex lens I 3-2 satisfy , the refractive index and Abbe number of the single lens I 4 satisfy , and the refractive index and Abbe number of the single lens II 5 satisfy .
[0028] The second optical assembly G2 comprises, from the infinite image plane M to the object plane N and along the optical axis, cemented lens III 6 and cemented lens IV 7, the cemented lens III 6 comprises cemented double convex lens IV 6-1 (left side) and double concave lens II 6-2 (right side), and the radii of curvature of the three surfaces of the cemented lens III 6 from left to right are R11>0, R12<0, R13>0 respectively; the cemented lens IV 7 comprises cemented meniscus lens III 7-1 (left side) and double convex lens V 7-2 (right side), and the radii of curvature of the three surfaces of the cemented lens IV 7 from left to right are R14>0, R15>0, R16<0 respectively, as shown in Figure 1 , Figure 2 .
[0029] The refractive index and Abbe number of the double convex lens IV 6-1 satisfy , the refractive index and Abbe number of the double-concave lens II 6-2 satisfy , the refractive index and Abbe number of the meniscus lens III 7-1 satisfy , the refractive index and Abbe number of the double-convex lens V 7-2 satisfy .
[0030] In an embodiment of the microscope objective of the present application, the design parameters of the aperture stop 1, the first optical assembly G1 and the second optical assembly G2 are as follows:
[0031]
[0032] In the above embodiment of the microscope objective of the present application, the curves of spherical aberration and chromatic aberration are as shown in Figure 3 .
[0033] In the above embodiment of the microscope objective of the present application, the curves of astigmatism and field curvature are as shown in Figure 4 .
[0034] In the above embodiment of the microscope objective of the present application, the curve of RMS wavefront error is as shown in Figure 5 .
[0035] The above embodiment only expresses a more specific and detailed implementation of the present application, but cannot be understood as a limitation on the scope of the patent. It must be pointed out that for those skilled in the art, without departing from the idea of the present application, a number of modifications and improvements can be made, which are all within the scope of protection of the present application.
Claims
1. A 95mm parfocal 5x high resolution large field flat field apochromatic microscope objective, characterized in that: It includes an aperture stop (1) arranged sequentially from the image plane M at infinity to the object plane N along the optical axis, a first optical component G1 and a second optical component G2. The first optical component G1 is used to provide positive optical power and correct the field curvature of the optical system, and the second optical component G2 is used to provide positive optical power and correct the spherical aberration and chromatic aberration of the optical system. The effective focal length of the microscope objective. The effective focal length of the first optical component G1, Let G be the effective focal length of the second optical component G2, and satisfy: 1 < <2,4< <6.
2. The 95mm parfocal 5x high resolution large field flat field apochromatic microscope objective according to claim 1, characterized in that: The first optical component G1 includes cemented lens I (2), cemented lens II (3), single lens I (4) and single lens II (5), the cemented lens I (2) is formed by cementing meniscus lens I (2-1) and meniscus lens II (2-2), the curvature radii of the three surfaces of the cemented lens I (2) are R1>0, R2>0 and R3>0 respectively; the cemented lens II (3) is formed by cementing biconcave lens I (3-1) and biconvex lens I (3-2), the curvature radii of the three surfaces of the cemented lens II (3) are R4<0, R5>0 and R6<0 respectively; the single lens I (4) is biconvex lens II, the curvature radii of the two surfaces of the single lens I (4) are R7>0 and R8<0 respectively; the single lens II (5) is biconvex lens III, the curvature radii of the two surfaces of the single lens II (5) are R9>0 and R10<0 respectively; The second optical component G2 includes cemented lens III (6) and cemented lens IV (7), the cemented lens III (6) is formed by cementing biconvex lens IV (6-1) and biconcave lens II (6-2), the curvature radii of the three surfaces of the cemented lens III (6) are R11>0, R12<0 and R13>0 respectively; the cemented lens IV (7) is formed by cementing meniscus lens III (7-1) and biconvex lens V (7-2), the curvature radii of the three surfaces of the cemented lens IV (7) are R14>0, R15>0 and R16<0 respectively.
3. The 95mm parfocal 5x high resolution large field flat field apochromatic microscope objective according to claim 2, characterized in that: The refractive index and Abbe number of the meniscus lens I (2-1) satisfy The refractive index and Abbe number of the meniscus lens II (2-2) satisfy The refractive index and Abbe number of the double-concave lens I (3-1) satisfy The refractive index and Abbe number of the double-convex lens I (3-2) satisfy The refractive index and Abbe number of the single lens I (4) satisfy The refractive index and Abbe number of the single lens II (5) satisfy ; The biconvex lens IV (6-1) satisfies The biconcave lens II (6-2) satisfies The meniscus lens III (7-1) satisfies The biconvex lens V (7-2) satisfies .
4. A 95mm, 5x, high resolution, flat field, apochromatic microscope objective of equal focal lengths according to any one of claims 1 to 3, characterized in that: The parfocal length of the microscope objective is 95mm, the working wavelength range is 436nm-656nm, the numerical aperture is 0.27, it is used with a tube lens with a focal length of 200mm, the field number is 44, and the free working distance is greater than 20mm.