A microscope tube lens

Abstract

The utility model discloses a microscope tube mirror belongs to microscope technical field, including first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6 and seventh lens L7 that set gradually in the light ray incident direction, first lens L1 and sixth lens L6 are flat convex lens, and third lens L3 and fourth lens L4 are double concave lens, and second lens L2, fifth lens L5 and seventh lens L7 are double convex lens, and fourth lens L4 and fifth lens L5 are double cemented lens simultaneously. Through above -mentioned mode, can have the all as fresh sharp picture image from center to edge in the wavelength bandwidth used all has excellent flatness.

Description

Technical Field

[0001] This utility model relates to the field of microscope technology, and specifically to a microscope tube. Background Technology

[0002] Microscopes, as essential tools in scientific research and medicine, are constantly being developed and improved. However, the performance of a microscope directly depends on its core component: the microscope tube. The microscope tube is a crucial part that directly affects the quality of the microscope image. While traditional microscope tubes already possess considerable performance, their simple structure limits their application in certain fields, such as semiconductor technology, biomedical research, and materials science, resulting in poor image clarity and low resolution.

[0003] Based on this, the present invention designs a microscope tube to solve the above problems. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a microscope tube.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A microscope tube includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged sequentially along the direction of light incidence. The first lens L1 and the sixth lens L6 are plano-convex lenses, the third lens L3 and the fourth lens L4 are biconcave lenses, and the second lens L2, the fifth lens L5, and the seventh lens L7 are biconvex lenses. Meanwhile, the fourth lens L4 and the fifth lens L5 are cemented doublet lenses. Furthermore, along the principal optical axis, the distance d1 between the rear surface of the first lens L1 and the front surface of the second lens L2 is 1-2 mm, the distance d3 between the rear surface of the second lens L2 and the front surface of the third lens L3 is 1-3 mm, the distance d4 between the rear surface of the third lens L3 and the front surface of the fourth lens L4 is 7-9 mm, the distance d4 between the rear surface of the fifth lens L5 and the front surface of the sixth lens L6 is 1-3 mm, the distance d5 between the rear surface of the sixth lens L6 and the front surface of the seventh lens L7 is 0.5-2 mm, and the distance d6 between the rear surface of the seventh lens L7 and the image plane is 40-60 mm. Further, the total focal length f of the lens satisfies 90mm<f<100mm, the focal length f1 of the first lens L1 satisfies 81mm<f1<85mm, the focal length f2 of the second lens satisfies 40mm<f2<44mm, the focal length f3 of the third lens satisfies -28mm<f3<-22mm, the focal length f4 of the fourth lens satisfies -33mm<f4<-29mm, the focal length f5 of the fifth lens satisfies 63mm<f5<67mm, the focal length f6 of the sixth lens satisfies 147mm<f6<153mm, and the focal length f7 of the seventh lens satisfies 82mm<f7<86mm; Further, the first lens L1 satisfies: 35<R1<38, R2 is a plane, 5<h1<5.8, where R1 is the curvature radius of the front surface of the first lens L1, R2 is the curvature radius of the rear surface of the first lens L1, and h1 is the central thickness of the first lens L1, with the unit being mm; Further, the second lens L2 satisfies: 21<R3<25, -98<R4<-93, 7<h2<8, where R3 is the curvature radius of the front surface of the second lens L2, R4 is the curvature radius of the rear surface of the second lens L2, and h2 is the central thickness of the second lens L2; Further, the third lens L3 satisfies: -76<R5<-72, 14<R6<18, 4 <h3<5.3, where R5 is the curvature radius of the front surface of the third lens L3, R6 is the curvature radius of the rear surface of the third lens L3, and h3 is the central thickness of the third lens L3; Further, the fourth lens L4 satisfies: -30<R7<-26, 57<R8<61, 3<h4<3.4, where R7 is the curvature radius of the front surface of the fourth lens L4, R8 is the curvature radius of the rear surface of the fourth lens L4, and h4 is the central thickness of the fourth lens L4; Further, the fifth lens L5 satisfies: 57<R9<61, -55<R10<-53, 1.5<h5<2.5, where R9 is the curvature radius of the front surface of the fifth lens L5, R10 is the curvature radius of the rear surface of the fifth lens L5, and h5 is the central thickness of the fifth lens L5; Further, the sixth lens L6 satisfies: R11 is a plane, -95<R12<-93, 0.5<h6<1.5, where R11 is the curvature radius of the front surface of the sixth lens L6, R12 is the curvature radius of the rear surface of the sixth lens L6, and h6 is the central thickness of the sixth lens L6; Further, the seventh lens L7 satisfies: 194<R13<196, -114<R14<-112, 5<h7<6, where R13 is the curvature radius of the front surface of the seventh lens L7, R14 is the curvature radius of the rear surface of the seventh lens L7, and h7 is the central thickness of the seventh lens L7.

[0006] Compared with the prior art, the advantages of this utility model are as follows: by adopting the design of an apochromatic tube lens and using it in conjunction with the objective lens, it can have excellent flatness throughout the entire wavelength bandwidth used, and can have a sharp image from the center to the edge. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the structure of a microscope tube according to the present invention; Figure 2 This is a chromatic aberration diagram of the vertical axis of a microscope tube according to the present invention; Figure 3 This is a distortion aberration diagram of a microscope tube according to the present invention; Figure 4 This is an axial chromatic aberration diagram of a microscope tube according to the present invention; Figure 5 This is an MTF diffraction modulation function diagram of a microscope tube according to the present invention. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0010] Example 1: In some embodiments, please refer to the accompanying drawings. Figure 1 A microscope tube includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 arranged sequentially along the incident direction of light. Among them, the first lens L1 and the sixth lens L6 are plano-convex lenses, the third lens L3 and the fourth lens L4 are biconcave lenses, the second lens L2, the fifth lens L5 and the seventh lens L7 are biconvex lenses; at the same time, the fourth lens L4 and the fifth lens L5 are cemented doublet lenses. Along the direction of the main optical axis, the distance d1 between the rear surface of the first lens L1 and the front surface of the second lens L2 is 1-2mm, the distance d3 between the rear surface of the second lens L2 and the front surface of the third lens L3 is 1-3mm, the distance d4 between the rear surface of the third lens L3 and the front surface of the fourth lens L4 is 7-9mm, the distance d4 between the rear surface of the fifth lens L5 and the front surface of the sixth lens L6 is 1-3mm, the distance d5 between the rear surface of the sixth lens L6 and the front surface of the seventh lens L7 is 0.5-2mm, and the distance d6 between the rear surface of the seventh lens L7 and the image plane is 40-60mm.

[0011] Embodiment 2: In some embodiments, as shown in Figures 2-5 , as a preferred embodiment of the present utility model, the total focal length f of the lens satisfies 90mm<f<100mm, the focal length f1 of the first lens L1 satisfies 81mm<f1<85mm, the focal length f2 of the second lens satisfies 40mm<f2<44mm, the focal length f3 of the third lens satisfies -28mm<f3<-22mm, the focal length f4 of the fourth lens satisfies -33mm<f4<-29mm, the focal length f5 of the fifth lens satisfies 63mm<f5<67mm, the focal length f6 of the sixth lens satisfies 147mm<f6<153mm, and the focal length f7 of the seventh lens satisfies 82mm<f7<86mm.

[0012] Embodiment 3: In some embodiments, as shown in Figures 2-5 , as a preferred embodiment of the present utility model, the first lens L1 satisfies: 35<R1<38, R2 is a plane, 5<h1<5.8, where R1 is the radius of curvature of the front surface of the first lens L1, R2 is the radius of curvature of the rear surface of the first lens L1, h1 is the center thickness of the first lens L1, and the unit is mm; the refractive index of the first lens L1 is 1.44, and the dispersion coefficient is 94.5.

[0013] The second lens L2 satisfies: 21<R3<25, -98<R4<-93, 7<h2<8, where R3 is the radius of curvature of the front surface of the second lens L2, R4 is the radius of curvature of the rear surface of the second lens L2, and h2 is the center thickness of the second lens L2; the refractive index of the second lens L2 is 1.44, and the dispersion coefficient is 94.5.

[0014] The third lens L3 satisfies: -76<R5<-72, 14<R6<18, 4 <h3<5.3, where R5 is the radius of curvature of the front surface of the third lens L3, R6 is the radius of curvature of the rear surface of the third lens L3, and h3 is the center thickness of the third lens L3; the refractive index of the third lens L3 is 1.52, and the dispersion coefficient is 64.2.

[0015] The fourth lens L4 satisfies: -30<R7<-26, 57<R8<61, 3<h4<3.4, where R7 is the radius of curvature of the front surface of the fourth lens L4, R8 is the radius of curvature of the rear surface of the fourth lens L4, and h4 is the central thickness of the fourth lens L4; the refractive index of the fourth lens L4 is 1.60, and the dispersion coefficient is 38.

[0016] The fifth lens L5 satisfies: 57<R9<61, -55<R10<-53, 1.5<h5<2.5, where R9 is the radius of curvature of the front surface of the fifth lens L5, R10 is the radius of curvature of the rear surface of the fifth lens L5, and h5 is the central thickness of the fifth lens L5; the refractive index of the fifth lens L5 is 1.44, and the dispersion coefficient is 94.2.

[0017] The sixth lens L6 satisfies: R11 is a flat surface, -95<R12<-93, 0.5<h6<1.5, where R11 is the radius of curvature of the front surface of the sixth lens L6, R12 is the radius of curvature of the rear surface of the sixth lens L6, and h6 is the central thickness of the sixth lens L6; the refractive index of the sixth lens L6 is 1.62, and the dispersion coefficient is 60.3.

[0018] The seventh lens L7 satisfies: 194<R13<196, -114<R14<-112, 5<h7<6, where R13 is the radius of curvature of the front surface of the seventh lens L7, R14 is the radius of curvature of the rear surface of the seventh lens L7, and h7 is the central thickness of the seventh lens L7; the refractive index of the seventh lens L7 is 1.85, and the dispersion coefficient of the third lens L3 is 32.3.

[0019] The above embodiments are only used to illustrate the technical solution of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model.

Claims

1. A microscope tube comprising a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged sequentially along the incident direction of light, characterized in that: The first lens L1 and the sixth lens L6 are plano-convex lenses, the third lens L3 and the fourth lens L4 are biconcave lenses, the second lens L2, the fifth lens L5 and the seventh lens L7 are biconvex lenses; meanwhile, the fourth lens L4 and the fifth lens L5 are a cemented doublet lens assembly.

2. The microscope tube according to claim 1, characterized in that, Along the direction of the main optical axis, the distance d1 between the rear surface of the first lens L1 and the front surface of the second lens L2 is 1-2mm, the distance d3 between the rear surface of the second lens L2 and the front surface of the third lens L3 is 1-3mm, the distance d4 between the rear surface of the third lens L3 and the front surface of the fourth lens L4 is 7-9mm, the distance d4 between the rear surface of the fifth lens L5 and the front surface of the sixth lens L6 is 1-3mm, the distance d5 between the rear surface of the sixth lens L6 and the front surface of the seventh lens L7 is 0.5-2mm, and the distance d6 between the rear surface of the seventh lens L7 and the image plane is 40-60mm.

3. The microscope tube according to claim 2, characterized in that, The total focal length f of the lens is 90mm<f<100mm, the focal length f1 of the first lens L1 is 81mm<f1<85mm, the focal length f2 of the second lens is 40mm<f2<44mm, the focal length f3 of the third lens is -28mm<f3<-22mm, the focal length f4 of the fourth lens is -33mm<f4<-29mm, the focal length f5 of the fifth lens is 63mm<f5<67mm, the focal length f6 of the sixth lens is 147mm<f6<153mm, and the focal length f7 of the seventh lens is 82mm<f7<86mm.

4. The microscope tube according to claim 3, characterized in that, The first lens L1 satisfies: 35<R1<38, R2 is a flat surface, 5<h1<5.8, where R1 is the radius of curvature of the front surface of the first lens L1, R2 is the radius of curvature of the rear surface of the first lens L1, and h1 is the central thickness of the first lens L1, with the unit being mm.

5. The microscope tube according to claim 3, characterized in that, The second lens L2 satisfies: 21<R3<25, -98<R4<-93, 7<h2<8, where R3 is the radius of curvature of the front surface of the second lens L2, R4 is the radius of curvature of the rear surface of the second lens L2, and h2 is the central thickness of the second lens L2.

6. The microscope tube according to claim 3, characterized in that, The third lens L3 satisfies: -76<R5<-72, 14<R6<18, 4 <h3<5.3, where R5 is the radius of curvature of the front surface of the third lens L3, R6 is the radius of curvature of the rear surface of the third lens L3, and h3 is the central thickness of the third lens L3.

7. The microscope tube according to claim 3, characterized in that, The fourth lens L4 satisfies: -30<R7<-26, 57<R8<61, 3<h4<3.4, where R7 is the radius of curvature of the front surface of the fourth lens L4, R8 is the radius of curvature of the rear surface of the fourth lens L4, and h4 is the central thickness of the fourth lens L4.

8. The microscope tube according to claim 3, characterized in that, The fifth lens L5 satisfies: 57<R9<61, -55<R10<-53, 1.5<h5<2.5, where R9 is the radius of curvature of the front surface of the fifth lens L5, R10 is the radius of curvature of the rear surface of the fifth lens L5, and h5 is the central thickness of the fifth lens L5.

9. The microscope tube according to claim 3, characterized in that, The sixth lens L6 satisfies: R11 is a flat surface, -95<R12<-93, 0.5<h6<1.5, wherein R11 is the curvature radius of the front surface of the sixth lens L6, R12 is the curvature radius of the rear surface of the sixth lens L6, and h6 is the central thickness of the sixth lens L6.

10. The microscope tube according to claim 3, characterized in that, The seventh lens L7 satisfies: 194<R13<196, -114<R14<-112, 5<h7<6, wherein R13 is the curvature radius of the front surface of the seventh lens L7, R14 is the curvature radius of the rear surface of the seventh lens L7, and h7 is the central thickness of the seventh lens L7.

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