Optical image rotation lens group and optical image rotation system of hard tube endoscope

Abstract

The utility model discloses a hard tube endoscope optical image rotation lens group and optical image rotation system, the optical image rotation lens group comprises a left side Hopkins rodlike lens group and a right side Hopkins rodlike lens group, the left side Hopkins rodlike lens group and the right side Hopkins rodlike lens group have the same structure and are arranged in a bilateral symmetry mode, the left side Hopkins rodlike lens group comprises a Hopkins rodlike lens and a glued Hopkins rodlike lens, the glued Hopkins rodlike lens is arranged on the left side Hopkins rodlike lens, and the glued Hopkins rodlike lens is arranged on the right side Hopkins rodlike lens. The glued Hopkins rodlike lens is formed by gluing a Hopkins rodlike lens and a Hopkins rodlike lens, and the convex surface of the glued Hopkins rodlike lens faces the diaphragm. The Hopkins rodlike lens is a convex lens, the Hopkins rodlike lens in the glued Hopkins rodlike lens is a concave lens, and the Hopkins rodlike lens is a convex lens. According to the utility model, the aberration of the hard tube endoscope image rotation lens group can be more effectively corrected, the installation is convenient, and the image quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hard tube endoscopes, and in particular relates to an optical image transfer lens group and an optical image transfer system of a hard tube endoscope. Background Art

[0002] Classic rigid endoscopes, with their unique advantages in image quality and cost-effectiveness, still have a very high application penetration rate and market share in the field of clinical diagnosis and treatment. In order to further demonstrate the unique advantages of rigid endoscopes, it is of great significance to carry out technical research and development work on them.

[0003] Classic rigid endoscopes include an optical path system from the object side, objective lens, rod lens, eyepiece, adapter (replaced by an ideal lens) to the image plane. The objective lens group converges the illumination beam reflected by the biological tissue and forms the first image of the biological tissue. The rod lens group performs multiple relay imaging of the image converged by the objective lens with the same size. The relay image is transmitted to the eyepiece group. The eyepiece group amplifies the relay image presented by the rod lens group and emits it in the form of parallel light, so that the human eye can observe in the most comfortable way behind the eyepiece. The photographic objective lens group converges the parallel light beam emitted by the eyepiece group at the position of the image sensor. Among them, the rod lens is mainly used to transmit the image and is an important component of the endoscope.

[0004] At present, rod mirrors generally adopt a single lens structure, but such a structure is prone to breakage when a longer total working length is required. In addition, the current rod mirrors are not ideal in eliminating phase aberration, transmitting image size and point spread function, and still need to be improved. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the utility model provides a rigid tube endoscope optical image transfer lens group and an optical image transfer system, which can more effectively correct the aberration of the rigid tube endoscope image transfer lens group, facilitate installation, and improve image quality.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] As a first aspect of the utility model, a rigid tube endoscope optical transfer lens group is provided, comprising a left Hopkins rod lens group and a right Hopkins rod lens group, the left Hopkins rod lens group and the right Hopkins rod lens group have the same structure and are symmetrically arranged, and an aperture is arranged between the left Hopkins rod lens group and the right Hopkins rod lens group to form a 1:1 double telecentric transfer system; the left Hopkins rod lens group comprises a No. 1 Hopkins rod lens and a glued Hopkins rod lens, the glued Hopkins rod lens is composed of a No. 2 Hopkins rod lens and a No. 3 Hopkins rod lens glued together, and both the No. 1 Hopkins rod lens and the glued Hopkins rod lens have convex surfaces facing the aperture.

[0008] Furthermore, the No. 1 Hopkins rod mirror is a convex lens, the No. 2 Hopkins rod mirror is a concave lens, the No. 3 Hopkins rod mirror is a convex lens, and the No. 1 Hopkins rod mirror and the No. 2 Hopkins rod mirror both have convex surfaces facing the aperture.

[0009] Furthermore, the diameters of the No. 1 Hopkins rod mirror and the glued Hopkins rod mirror in the left Hopkins rod mirror group are the same.

[0010] Furthermore, the caliber range of the lens group of the rigid tube endoscope is 1.2 mm to 5.6 mm.

[0011] Furthermore, the materials of the No. 1 Hopkins rod mirror and the glued rod mirror in the left Hopkins rod mirror group are different.

[0012] Furthermore, the material used for the No. 1 Hopkins rod mirror is D-ZF93, the material used for the No. 2 Hopkins rod mirror is H-ZF62, and the material used for the No. 3 Hopkins rod mirror is H-ZLAF76A.

[0013] Furthermore, the refractive index range of the No. 1 Hopkins rod mirror is 1.95-2.00, and the Abbe number range is 19.2-20.7; among the glued Hopkins rod mirrors, the refractive index range of the No. 2 Hopkins rod mirror is 1.85-1.92, and the Abbe number range is 19.2-20.9; the refractive index range of the No. 3 Hopkins rod mirror is 1.85-1.92, and the Abbe number range is 29.7-30.5.

[0014] Furthermore, the focal length of the No. 1 Hopkins rod mirror is 6mm to 15mm; the lens thickness range is 8.95mm to 9.86mm; the focal length of the No. 2 Hopkins rod mirror is -1.65mm to -1.51mm; the lens thickness range is 4.06mm to 4.15nm; the focal length of the No. 3 Hopkins rod mirror is 4.15mm to 4.31mm; the lens thickness range is 7.93nm to 8.85nm.

[0015] As a second aspect of the utility model, a rigid tube endoscope optical image transfer system is provided, comprising an objective lens, an eyepiece, and a plurality of rigid tube endoscope optical image transfer lens groups arranged between the objective lens and the eyepiece, wherein the plurality of rigid tube endoscope optical image transfer lens groups are arranged in any order along the optical axis.

[0016] Furthermore, the number of the optical relay lens groups of the rigid tube endoscope is an odd number.

[0017] The utility model has the following advantages:

[0018] It helps to extend the total working length of the endoscope system and reduce the processing cost at the same time; the two Hopkins rods of a single optical image transfer lens group are symmetrically arranged in a manner that can eliminate phase difference; a single Hopkins rod adopts a convex-concave-convex structure, so that it appears as a positive lens as a whole, thereby achieving the effect of a smaller point spread function; the optical image transfer system is composed of an odd number of optical image transfer lens groups placed along the optical axis, which can effectively reduce residual aberration and dispersion, correct field curvature and vertical axis chromatic aberration, facilitate installation, reduce processing costs, and reduce the point spread function, thereby improving the imaging quality of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of a rigid tube endoscope optical image relay lens group of a rigid tube endoscope optical image relay system described in Example 1 of the utility model;

[0020] Figure 2 This is a modulation transfer function (MTF) diagram of the optical image relay system of the rigid tube endoscope described in Example 1 of the utility model;

[0021] Figure 3 This is a field curvature distortion diagram of the optical image transfer system of the rigid tube endoscope described in Example 1 of the utility model;

[0022] Figure 4 This is a structural schematic diagram of a rigid tube endoscope optical image relay lens group of a rigid tube endoscope optical image relay system described in Example 2 of the utility model;

[0023] Figure 5 This is a modulation transfer function (MTF) diagram of the optical image relay system of the rigid tube endoscope described in Example 2 of the utility model;

[0024] Figure 6 This is a field curvature distortion diagram of the optical image relay system of the rigid tube endoscope described in Example 2 of the present utility model. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] An optical image transfer lens group for a rigid tube endoscope comprises a left Hopkins rod lens group and a right Hopkins rod lens group, the left Hopkins rod lens group and the right Hopkins rod lens group have the same structure and are bilaterally symmetrically arranged, an aperture is arranged between the left Hopkins rod lens group and the right Hopkins rod lens group, and a 1:1 double telecentric image transfer system is formed; the left Hopkins rod lens group comprises a No. 1 Hopkins rod lens L7 and a glued Hopkins rod lens, the glued Hopkins rod lens is composed of a No. 2 Hopkins rod lens L8 and a No. 3 Hopkins rod lens L9 glued together, and the No. 1 Hopkins rod lens L7 and the glued Hopkins rod lens both have convex surfaces facing the aperture.

[0027] Furthermore, the first Hopkins rod mirror L7 is a convex lens, the second Hopkins rod mirror L8 is a concave lens, the third Hopkins rod mirror L9 is a convex lens, and the first Hopkins rod mirror L7 and the second Hopkins rod mirror L8 both have convex surfaces facing the aperture.

[0028] Furthermore, the diameters of a No. 1 Hopkins rod mirror L7 and a glued Hopkins rod mirror in the left Hopkins rod mirror group are the same.

[0029] Furthermore, the caliber range of the lens group of the rigid tube endoscope is 1.2 mm to 5.6 mm.

[0030] Furthermore, the materials of a No. 1 Hopkins rod mirror L7 and a glued rod mirror in the left Hopkins rod mirror group are different.

[0031] Preferably, the material of the No. 1 Hopkins rod mirror L7 is D-ZF93, the material of the No. 2 Hopkins rod mirror L8 is H-ZF62, and the material of the No. 3 Hopkins rod mirror L9 is H-ZLAF76A.

[0032] Preferably, the refractive index range of the No. 1 Hopkins rod mirror L7 is 1.95-2.00, and the Abbe number range is 19.2-20.7; among the glued Hopkins rod mirrors, the refractive index range of the No. 2 Hopkins rod mirror L8 is 1.85-1.92, and the Abbe number range is 19.2-20.9; the refractive index range of the No. 3 Hopkins rod mirror L9 is 1.85-1.92, and the Abbe number range is 29.7-30.5.

[0033] Preferably, the focal length of the No. 1 Hopkins rod lens L7 is 6 mm to 15 mm; the lens thickness ranges from 8.95 mm to 9.86 mm.

[0034] Preferably, the focal length of the second Hopkins rod mirror L8 is -1.65 mm to -1.51 mm; the lens thickness ranges from 4.06 mm to 4.15 nm.

[0035] Preferably, the focal length of the No. 3 Hopkins rod mirror L9 is 4.15 mm to 4.31 mm; the lens thickness ranges from 7.93 nm to 8.85 nm.

[0036] A rigid tube endoscope optical image transfer system comprises an objective lens, an eyepiece and a plurality of rigid tube endoscope optical image transfer lens groups arranged between the objective lens and the eyepiece, wherein the plurality of rigid tube endoscope optical image transfer lens groups are arranged in any order along the optical axis, and the number of the rigid tube endoscope optical image transfer lens groups is an odd number.

[0037] Example 1

[0038] like Figure 1 As shown, a rigid tube endoscope optical image transfer system includes an objective lens, an eyepiece, and a group of rigid tube endoscope optical image transfer lens groups arranged between the objective lens and the eyepiece. The group of rigid tube endoscope optical image transfer lens groups includes a left Hopkins rod lens group and a right Hopkins rod lens group, the left Hopkins rod lens group and the right Hopkins rod lens group have the same structure and are arranged symmetrically, and an aperture is arranged between the left Hopkins rod lens group and the right Hopkins rod lens group, forming a 1:1 double telecentric image transfer system.

[0039] The left Hopkins rod lens group includes a No. 1 Hopkins rod lens L7 and a glued Hopkins rod lens, the glued Hopkins rod lens is composed of a No. 2 Hopkins rod lens L8 and a No. 3 Hopkins rod lens L9 glued together, and the No. 1 Hopkins rod lens L7 and the glued Hopkins rod lens both have convex surfaces facing the aperture. The No. 1 Hopkins rod lens L7 is a convex lens, the No. 2 Hopkins rod lens L8 is a concave lens, and the No. 3 Hopkins rod lens L9 is a convex lens.

[0040] The right Hopkins rod lens group includes a No. 4 Hopkins rod lens L12 and a glued Hopkins rod lens, and the glued rod lens is composed of a No. 5 Hopkins rod lens L11 and a No. 6 Hopkins rod lens L10 glued together, and the Hopkins rod lens 12 and the glued Hopkins rod lens both have convex surfaces facing the aperture. The No. 4 Hopkins rod lens L12 is a convex lens, the No. 5 Hopkins rod lens L11 is a concave lens, and the No. 6 Hopkins rod lens L10 is a convex lens.

[0041] The diameters of a No. 1 Hopkins rod mirror L7 and a glued Hopkins rod mirror in the left Hopkins rod mirror group are the same.

[0042] The caliber range of the lens group of the rigid tube endoscope is 1.2 mm to 5.6 mm, which can meet the caliber requirements of intervertebral foraminal endoscopes, sinus endoscopes, neuroendoscopes, choledochoscopes, laparoscopes, etc.

[0043] The materials of the first Hopkins rod mirror L7 and the glued rod mirror in the left Hopkins rod mirror group are different. In this embodiment, the first Hopkins rod mirror L7 is made of D-ZF93, and in the glued Hopkins rod mirror, the second Hopkins rod mirror L8 is made of H-ZF62, and the third Hopkins rod mirror L9 is made of H-ZLAF76A.

[0044] The refractive index of the first Hopkins rod mirror L7 is in the range of 1.95 to 2.00, and the Abbe number is in the range of 19.2 to 20.7. Among the cemented Hopkins rod mirrors, the refractive index of the second Hopkins rod mirror L8 is in the range of 1.85 to 1.92, and the Abbe number is in the range of 19.2 to 20.9; the refractive index of the third Hopkins rod mirror L9 is in the range of 1.85 to 1.92, and the Abbe number is in the range of 29.7 to 30.5.

[0045] In the following, we call L7S1 to represent the S1 surface of the first Hopkins rod mirror L7, L8S2 to represent the S2 surface of the second Hopkins rod mirror L8, and so on. L7S1 of the first Hopkins rod mirror L7 is convex, L7S2 is convex, L8S2 is coupled with L9S1, and L9S2 is convex. The curvature radius of L8S2 of the second Hopkins rod mirror L8 is consistent with L9S1, and L9S1 is coupled with L8S2.

[0046] The focal length of the No. 1 Hopkins rod lens L7 is 6mm to 15mm, 8.07mm in this embodiment, the curvature radius L7S1 of the first surface from the light incident direction is 9.43, the curvature radius L7S2 of the second surface is -26.97, the lens thickness range is 8.95mm to 9.86mm, and the material is D-ZF93.

[0047] The focal length of the second Hopkins rod mirror L8 is -1.65mm~-1.51mm; in this embodiment, it is -1.58; the radius of curvature L8S1 of the first surface of the mirror from the direction of incident light is -4.13, the radius of curvature L8S2 of the second surface is 3.38, the lens thickness range is 4.06mm~4.15nm, and the material is H-ZF62; the radius of curvature of L8S2 is consistent with L9S1, and L8S2 is coupled with L9S1.

[0048] The focal length of the No. 3 Hopkins rod mirror L9 is 4.15mm to 4.31mm, and is 4.20mm in this embodiment; the radius of curvature of L9S2 is -8.56mm to -7.95mm, and is -8.06m in this embodiment, the lens thickness ranges from 7.93nm to 8.85nm, and the material is H-ZLAF76A.

[0049] The spacing between each left Hopkins rod lens group and the right Hopkins rod lens group is 0-10mm, and in this embodiment, it is 5.36mm; the spacing between adjacent Hopkins rod lenses in a single-side Hopkins rod lens group is 0-1mm, and in this embodiment, it is 1mm. In this embodiment, the relative position and spacing between the lenses are ensured by spacers (hollow), and then the lenses are fixed to the tube wall by glue.

[0050] like Figure 2 The modulation transfer function (MTF) curve of the optical image relay system of this embodiment is given when the cutoff spatial frequency is 40lp / mm. Figure 2 It can be concluded that the MTF value in the full field of view is close to 0.7, which has a very high resolution; Figure 3 is a field curvature-distortion curve diagram of the optical image relay system of this embodiment, from Figure 3It can be seen that the field curvature within the full field of view is no more than 0.2, and the distortion is no more than 0.02%.

[0051] Example 2

[0052] like Figure 4 As shown, a rigid tube endoscope optical image transfer system includes an objective lens, an eyepiece, and three groups of rigid tube endoscope optical image transfer lens groups arranged between the objective lens and the eyepiece. The distance between the three groups of rigid tube endoscope optical image transfer lens groups is 6 mm. The three groups of rigid tube endoscope optical image transfer lens groups are arranged in any front-to-back order along the optical axis direction, which can effectively correct the residual aberration.

[0053] like Figure 5 The modulation transfer function (MTF) curve of the optical image relay system of this embodiment is given when the cutoff spatial frequency is 40lp / mm. Figure 5 It can be concluded that the MTF value in the full field of view is close to 0.7, which has a very high resolution; Figure 6 is a field curvature-distortion curve diagram of the optical image relay system of this embodiment, from Figure 6 It can be seen that the field curvature within the full field of view is no more than 0.2, and the distortion is no more than 0.02%.

[0054] The specific embodiments described in this article are merely examples of the spirit of the utility model. A person skilled in the art of the utility model may make various modifications or additions to the specific embodiments described, or replace them in a similar manner, but this will not deviate from the spirit of the utility model or exceed the scope defined by the attached claims. Although this article uses more terms such as objective lens, eyepiece, rod lens, convex lens, concave lens, convex-concave-convex structure, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional limitation is contrary to the spirit of the utility model.

Claims

1. An optical image-relay lens assembly for a rigid tube endoscope, characterized in that: The invention comprises a left Hopkins rod lens group and a right Hopkins rod lens group, the left Hopkins rod lens group and the right Hopkins rod lens group have the same structure and are symmetrically arranged, an aperture is arranged between the left Hopkins rod lens group and the right Hopkins rod lens group, and a 1:1 double telecentric image rotation system is formed; the left Hopkins rod lens group comprises a No. 1 Hopkins rod lens and a glued Hopkins rod lens, the glued Hopkins rod lens is composed of a No. 2 Hopkins rod lens and a No. 3 Hopkins rod lens glued together, and the No. 1 Hopkins rod lens and the glued Hopkins rod lens both have convex surfaces facing the aperture.

2. The optical image-relay lens assembly for a rigid tube endoscope according to claim 1, characterized in that: The No. 1 Hopkins rod mirror is a convex lens, the No. 2 Hopkins rod mirror is a concave lens, and the No. 3 Hopkins rod mirror is a convex lens. The No. 1 Hopkins rod mirror and the No. 2 Hopkins rod mirror both have convex surfaces facing the aperture.

3. The optical image-relay lens assembly for a rigid tube endoscope according to claim 1, characterized in that: The diameters of the No. 1 Hopkins rod mirror and the one glued Hopkins rod mirror in the left Hopkins rod mirror group are the same.

4. The optical image-relay lens assembly for a rigid tube endoscope according to claim 1, characterized in that: The caliber range of the lens group of the rigid tube endoscope is 1.2 mm to 5.6 mm.

5. The optical image-relay lens assembly for a rigid tube endoscope according to claim 1, characterized in that: The materials of the No. 1 Hopkins rod mirror and the glued rod mirror in the left Hopkins rod mirror group are different.

6. The optical image-relay lens assembly for a rigid tube endoscope according to claim 5, characterized in that: The material used for the No. 1 Hopkins rod mirror is D-ZF93, the material used for the No. 2 Hopkins rod mirror is H-ZF62, and the material used for the No. 3 Hopkins rod mirror is H-ZLAF76A.

7. The optical image-relay lens assembly for a rigid tube endoscope according to claim 1, characterized in that: The refractive index range of the No. 1 Hopkins rod mirror is 1.95-2.00, and the Abbe number range is 19.2-20.7; among the glued Hopkins rod mirrors, the refractive index range of the No. 2 Hopkins rod mirror is 1.85-1.92, and the Abbe number range is 19.2-20.9; the refractive index range of the No. 3 Hopkins rod mirror is 1.85-1.92, and the Abbe number range is 29.7-30.

5.

8. The optical image-relay lens assembly for a rigid tube endoscope according to claim 1, characterized in that: The focal length of the No. 1 Hopkins rod mirror is 6mm to 15mm; the lens thickness range is 8.95mm to 9.86mm; the focal length of the No. 2 Hopkins rod mirror is -1.65mm to -1.51mm; the lens thickness range is 4.06mm to 4.15nm; the focal length of the No. 3 Hopkins rod mirror is 4.15mm to 4.31mm; the lens thickness range is 7.93nm to 8.85nm.

9. An optical image relay system for a rigid tube endoscope, characterized in that: The optical image-relay lens comprises an objective lens, an eyepiece, and a plurality of optical image-relay lens groups of a rigid tube endoscope as claimed in any one of claims 1 to 8 arranged between the objective lens and the eyepiece, wherein the plurality of optical image-relay lens groups of the rigid tube endoscope are arranged in any order along the optical axis.

10. The rigid tube endoscope optical relay system according to claim 9, characterized in that: The number of the optical relay lens groups of the rigid tube endoscope is an odd number.

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