A high-definition sinusoscope optical system

Abstract

The present invention proposes a high-definition sinusoscope optical system, which relates to the technical field of endoscopes. A high-definition sinusoscope optical system comprises: an objective lens system; a steering system, comprising a plurality of steering units arranged in sequence; an eyepiece system, wherein the objective lens system, the steering system and the eyepiece system are arranged in sequence from the object side to the image side; wherein the steering units are set to an even number, and the eyepiece system forms an inverted image. The present invention increases the entrance pupil diameter of the system by setting and using an even number of steering units, so that the angular resolution of the sinusoscope system is greater than 4.8c / °, reaching the high-definition standard.

Description

Technical Field

[0001] The invention belongs to the technical field of endoscopes, and in particular relates to a high-definition sinusoscope optical system. Background Art

[0002] An endoscope is a medical device that allows doctors to enter the body through natural orifices (such as the mouth, nose, anus, etc.) or small incisions to observe the condition of internal organs. It is an important tool for medical intervention and observation.

[0003] In order to ensure a positive image, the steering system of current endoscopes uses an odd number of steering units (rod mirror groups) for steering, that is, the rod mirror groups are set to 1, 3, 5, 7, etc.

[0004] It is difficult to achieve a large entrance pupil diameter in conventional nose mirrors. Generally, a 75-degree nose mirror with a lens thickness of 2.7-2.8mm has an entrance pupil diameter of 0.2mm, and the corresponding theoretical angular resolution is 5c / °. The actual angular resolution produced is generally only 3.5-4c / °, which cannot meet the HD standard. If the HD standard is to be met, the angular resolution must reach 4.8c / °@75 degrees, which is difficult to achieve with a conventional three-group rod mirror steering system. If a five-group rod mirror steering system is used, the system is difficult to design due to the limitations of the sinus mirror structure, including the corresponding viewing prism, which is also difficult to design and process. Summary of the invention

[0005] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a high-definition sinusoscope optical system that uses an even array of steering units to increase the entrance pupil diameter of the system so that the angular resolution is greater than 4.8c / °.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A high-definition sinus mirror optical system, comprising:

[0007] Objective system;

[0008] A steering system, comprising a plurality of steering units arranged in sequence;

[0009] An eyepiece system, wherein the objective lens system, the steering system and the eyepiece system are arranged in sequence from the object side to the image side;

[0010] Wherein, the steering units are arranged in an even number, and the eyepiece system forms an inverted image.

[0011] As a further improvement of the present invention, a stray light barrier is provided in the objective lens system.

[0012] As a further improvement of the present invention, the objective lens system includes objective lens 1, objective lens 2, objective lens 3, and objective lens 4 arranged in sequence from the object side to the image side, and the stray light elimination bar is arranged between the objective lens 2 and the objective lens 3, and the stray light elimination bar is offset against the objective lens 2 and the objective lens 3 respectively.

[0013] As a further improvement of the present invention, the object side of objective lens one is a plane, and the image side is a concave surface; the object side and the image side of objective lens two are both planes; the object side of objective lens three is a concave surface, and the image side is a convex surface; objective lens four includes a glued lens one and a lens two, the object side of lens one is a convex surface, and the image side is a concave surface, and the object side of lens two is a convex surface, and the image side is a convex surface.

[0014] As a further improvement of the present invention, the objective lens system also includes objective lens five, which is arranged between objective lens four and the steering system. The objective lens five includes glued lens three and lens four, the object side and image side of lens three are both concave, and the object side and image side of lens four are both convex.

[0015] As a further improvement of the present invention, the structures of the multiple steering units are the same, or the structures of the multiple steering units are the same in pairs.

[0016] As a further improvement of the present invention, the steering unit comprises a rod mirror 1, a steering mirror and a rod mirror 2 which are arranged in sequence from the object side to the image side, and the steering mirror is configured as a cemented mirror group.

[0017] As a further improvement of the present invention, the object side of the rod mirror one is convex and the image side is flat; the object side of the rod mirror two is flat and the image side is convex; the turning mirror includes a glued lens five and a lens six, one of the lens five and the lens six has a convex object side and a concave image side, and the other has both a convex object side and an image side.

[0018] As a further improvement of the present invention, the eyepiece system includes eyepiece one, eyepiece two, eyepiece three, eyepiece four, eyepiece five and eyepiece six arranged in sequence from the object side to the image side, and the eyepiece one, eyepiece four and eyepiece six are arranged as a cemented lens group.

[0019] As a further improvement of the present invention, the eyepiece one includes a glued lens seven and a lens eight, the object side and the image side of the lens seven are both concave, and the object side and the image side of the lens eight are both convex; the eyepiece four includes a glued lens nine and a lens ten, the object side and the image side of the lens nine are both convex, and the object side and the image side of the lens ten are both concave; the eyepiece six includes a glued lens eleven and a lens twelve, the object side and the image side of the lens eleven are both concave, and the object side and the image side of the lens twelve are both convex; the object side and the image side of the eyepiece two, the eyepiece three and the eyepiece five are all convex.

[0020] Based on the above technical solution, the present invention can at least produce the following technical effects:

[0021] 1. By setting up an even array of steering units to increase the entrance pupil diameter of the system, the angular resolution of the sinusoscope system is made greater than 4.8c / °, reaching the high-definition standard.

[0022] 2. By setting the eyepiece system to form an inverted image, the inverted image problem formed after adopting an even array of steering units is compensated, so that the entire system forms a positive image.

[0023] 3. By setting a stray light bar in the objective lens group, the stray light that is not needed by the system can be shielded, allowing only the imaging light to pass through, thereby improving the system contrast.

[0024] 4. By setting objective lens five, the imaging quality of the system can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the optical system of the high-definition sinus mirror of the present invention.

[0026] Figure 2 Schematic diagram of the objective lens system in the present invention.

[0027] Figure 3 Schematic diagram of the steering system of the present invention.

[0028] Figure 4 Schematic diagram of the eyepiece system of the present invention.

[0029] Figure 5 It is an imaging diagram of the optical system of the high-definition sinus mirror of the present invention.

[0030] In the figure, 100, objective lens system; 110, objective lens 1; 120, objective lens 2; 130, objective lens 3; 140, objective lens 4; 141, lens 1; 142, lens 2; 150, objective lens 5; 151, lens 3; 152, lens 4; 160, stray light bar; 200, first steering unit; 210, rod lens 1; 220, steering mirror; 221, lens 5; 222, lens 6; 230, rod lens 2; 300, second steering unit; 400, third steering unit; 500, fourth steering unit; 600, eyepiece system; 610, eyepiece one; 611, lens seven; 612, lens eight; 620, eyepiece two; 630, eyepiece three; 640, eyepiece four; 641, lens nine; 642, lens ten; 650, eyepiece five; 660, eyepiece six; 661, lens eleven; 662, lens twelve. DETAILED DESCRIPTION

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, in the present invention, the descriptions such as "first", "second", "one", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly defined. In the present invention, unless otherwise clearly defined and defined, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0032] The following is a specific embodiment of the present invention, and Figure 1-5 , the technical solution of the present invention is further described, but the present invention is not limited to this embodiment.

[0033] A high-definition sinus mirror optical system comprises: an objective lens system 100, a steering system and an eyepiece system 600 arranged in sequence from the object side to the image side. The steering system comprises an even number of steering units arranged in sequence. In this embodiment, the number of steering units is four.

[0034] The high-definition sinusoscope optical system of the present invention increases the entrance pupil diameter of the system by using four sets of steering units compared to the conventional three sets of steering units, so that the angular resolution of the sinusoscope system is greater than 4.8c / °, reaching the high-definition standard. It should be noted that in the optical system, "c / °" is a unit used to describe spatial frequency, which represents the number of cycles that can be distinguished within each degree of viewing angle. This unit is usually used to measure the resolution of the human visual system or the resolution ability of the imaging system.

[0035] In the high-definition sinus mirror optical system of the present invention, the magnification of the objective lens system 100 is -1X, and in the steering system, the magnification of each group of steering units is also -1X. Since the present invention creatively uses four groups of steering units compared to the conventional three-rod mirror group steering system, the image formed after the steering system is an inverted image. In order to compensate for the problem that the image formed after adopting an even number of steering units is an inverted image, the present invention also sets the magnification of the eyepiece system 600 to -1X, that is, the eyepiece system 600 forms an inverted image. In order to be able to set the eyepiece system 600 as an inverted image system with a magnification of -1X, the length of the eyepiece system 600 needs to be increased, and the length of the eyepiece system 600 needs to be at least greater than 20mm. By setting the eyepiece system 600 to form an inverted image, it is used to compensate for the inverted image problem formed after adopting an even number of steering units, so that the entire system forms a positive image.

[0036] The objective lens system 100 of the high-definition sinus mirror optical system of the present invention is provided with a stray light barrier 160. Specifically, the objective lens system 100 includes an objective lens 1 110, an objective lens 2 120, an objective lens 3 130, and an objective lens 4 140 arranged in sequence from the object side to the image side, and the stray light barrier 160 is arranged between the objective lens 2 120 and the objective lens 3 130, and the stray light barrier 160 is offset against the objective lens 2 120 and the objective lens 3 130 respectively.

[0037] The stray light barrier 160 is a device used in an optical system to reduce or eliminate the influence of stray light. The working principle of the stray light barrier 160 is mainly to physically block unnecessary light to ensure that only the expected light can reach the observer's eyes. The present invention can shield the stray light that is not needed by the system by arranging the stray light barrier 160 in the objective lens group, and only allow the imaging light to pass through, thereby improving the contrast of the system.

[0038] like Figure 2 As shown, the specific structure of the objective lens system 100 in the present invention is as follows: the object side of objective lens 1 110 is a plane, and the image side is a concave surface; the object side and the image side of objective lens 2 120 are both planes; the object side of objective lens 3 130 is a concave surface, and the image side is a convex surface; objective lens 4 140 includes a glued lens 1 141 and a lens 2 142, the object side of lens 1 141 is a convex surface, and the image side is a concave surface, and the object side of lens 2 142 is a convex surface, and the image side is a convex surface.

[0039] The objective lens system 100 further includes an objective lens 5 150, which is disposed between the objective lens 4 140 and the steering system. The objective lens 5 150 includes a glued lens 3 151 and a lens 4 152. The lens 3 151 has a concave surface on the object side and an image side, and the lens 4 152 has a convex surface on the object side and an image side. There are intervals between each of the objective lens 1 110, the objective lens 2 120, the objective lens 3 130, the objective lens 4 140 and the objective lens 5 150.

[0040] It should be noted that the objective lens system 100 in the present invention can achieve the purpose of the present invention by using objective lens 1 110, objective lens 2 120, objective lens 3 130, and objective lens 4 140. In this embodiment, objective lens 5 150 is provided to further improve the imaging quality of the system.

[0041] The steering system in the present invention has an even number of steering units, four in the present embodiment, namely a first steering unit 200, a second steering unit 300, a third steering unit 400 and a fourth steering unit 500, the structures of the four steering units are identical to each other, specifically, the structures of the first steering unit 200 and the third steering unit 400 are identical, and the structures of the second steering unit 300 and the fourth steering unit 500 are identical. In other embodiments, all steering unit structures may also be identical.

[0042] Specifically, Figure 3 As shown, the steering unit includes a rod mirror 1 210, a steering mirror 220 and a rod mirror 2 230 arranged in sequence from the object side to the image side, and the steering mirror 220 is set as a glued mirror group. The rod mirror 1 210 has a convex surface on the object side and a flat surface on the image side; the rod mirror 230 has a flat surface on the object side and a convex surface on the image side; the steering mirror 220 includes a glued lens 5 221 and a lens 6 222, one of the lens 5 221 and the lens 6 222 has a convex surface on the object side and a concave surface on the image side, and the other has a convex surface on both the object side and the image side. In this embodiment, the rod mirror 1 210 and the rod mirror 2 230 have the same structure, and the two are arranged in reverse.

[0043] It should be noted that the steering unit in the present invention is not limited to the structure in this embodiment (the steering mirror 220 is arranged between two rod mirrors), and can also be set to other structures, such as the steering mirror 220 is arranged on one side of the steering unit, or the steering mirror 220 is arranged on both sides of the steering unit, etc.

[0044] The eyepiece system 600 of the present invention includes eyepiece 1 610, eyepiece 2 620, eyepiece 3 630, eyepiece 4 640, eyepiece 5 650 and eyepiece 6 660 arranged in sequence from the object side to the image side, and the eyepiece 1 610, eyepiece 4 640 and eyepiece 6 60 are arranged as a glued lens group. The eyepiece 1 610, eyepiece 2 620, eyepiece 3 630, eyepiece 4 640, eyepiece 5 650 and eyepiece 6 60 are provided with intervals between each two.

[0045] Specifically, Figure 4As shown, eyepiece one 610 includes glued lens seven 611 and lens eight 612, lens seven 611 has concave surfaces on the object side and image side, and lens eight 612 has convex surfaces on the object side and image side; eyepiece four 640 includes glued lens nine 641 and lens ten 642, lens nine 641 has convex surfaces on the object side and image side, and lens ten 642 has concave surfaces on the object side and image side; eyepiece six 660 includes glued lens ten 642-1 and lens ten 642-2, lens ten 642-1 has concave surfaces on the object side and image side, and lens ten 642-2 has convex surfaces on the object side and image side; eyepiece two 620, eyepiece three 630 and eyepiece five 650 have convex surfaces on the object side and image side.

[0046] In summary, the objective lens system 100 in the high-definition sinusoscope optical system of the present invention has a stray light bar 160 that helps to eliminate stray light and improve the contrast of the high-definition sinusoscope. At the same time, the system contains four sets of steering units, plus an eyepiece with a magnification of -1X, to form a complete sinusoscope optical system. The system has the characteristics of eliminating stray light and high resolution. At the same time, the distortion of the system is about 10%, achieving a small distortion function. The specific embodiments described in this article are only illustrative of the spirit of the present invention. Technicians in the technical field to which the present invention belongs can make various modifications or supplements to the described specific embodiments or replace them in a similar manner, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

Claims

1. A high-definition sinusoscope optical system, characterized in that: include: Objective lens system (100); A steering system, comprising a plurality of steering units arranged in sequence; An eyepiece system (600), wherein the objective lens system (100), the steering system and the eyepiece system (600) are arranged in sequence from the object side to the image side; Wherein, the steering units are arranged in an even number, and the eyepiece system (600) forms an inverted image.

2. The high-definition sinusoscope optical system according to claim 1, characterized in that: The objective lens system (100) is provided with a stray light elimination barrier (160).

3. The high-definition sinusoscope optical system according to claim 2, characterized in that: The objective lens system (100) comprises an objective lens 1 (110), an objective lens 2 (120), an objective lens 3 (130), and an objective lens 4 (140) which are arranged in sequence from the object side to the image side, and the stray light elimination bar (160) is arranged between the objective lens 2 (120) and the objective lens 3 (130), and the stray light elimination bar (160) is offset against the objective lens 2 (120) and the objective lens 3 (130) respectively.

4. The high-definition sinusoscope optical system according to claim 3, characterized in that: The object side of the objective lens 1 (110) is a plane, and the image side is a concave surface; the object side and the image side of the objective lens 2 (120) are both planes; the object side of the objective lens 3 (130) is a concave surface, and the image side is a convex surface; the objective lens 4 (140) comprises a glued lens 1 (141) and a lens 2 (142), the object side of the lens 1 (141) is a convex surface, and the image side is a concave surface, and the object side of the lens 2 (142) is a convex surface, and the image side is a convex surface.

5. The high-definition sinusoscope optical system according to claim 3, characterized in that: The objective lens system (100) also includes an objective lens five (150), which is arranged between the objective lens four (140) and the steering system. The objective lens five (150) includes a glued lens three (151) and a lens four (152), wherein the object side and the image side of the lens three (151) are both concave, and the object side and the image side of the lens four (152) are both convex.

6. The high-definition sinusoscope optical system according to claim 1, characterized in that: The structures of the multiple steering units are all the same, or the structures of the multiple steering units are the same in pairs.

7. The high-definition sinusoscope optical system according to claim 6, characterized in that: The steering unit comprises a rod mirror 1 (210), a steering mirror (220) and a rod mirror 2 (230) which are arranged in sequence from the object side to the image side, and the steering mirror (220) is configured as a cemented mirror group.

8. The high-definition sinusoscope optical system according to claim 7, characterized in that: The object side of the rod mirror 1 (210) is convex, and the image side is flat; the object side of the rod mirror 2 (230) is flat, and the image side is convex; the steering mirror (220) comprises a glued lens 5 (221) and a lens 6 (222), one of which has a convex object side and a concave image side, and the other has a convex object side and an image side.

9. The high-definition sinusoscope optical system according to claim 1, characterized in that: The eyepiece system (600) includes eyepiece one (610), eyepiece two (620), eyepiece three (630), eyepiece four (640), eyepiece five (650) and eyepiece six (660) which are arranged in sequence from the object side to the image side, and the eyepiece one (610), eyepiece four (640) and eyepiece six (660) are configured as a cemented lens group.

10. The high-definition sinusoscope optical system according to claim 9, characterized in that: The eyepiece one (610) includes a glued lens seven (611) and a lens eight (612), wherein the object side and the image side of the lens seven (611) are both concave, and the object side and the image side of the lens eight (612) are both convex; the eyepiece four (640) includes a glued lens nine (641) and a lens ten (642), wherein the object side and the image side of the lens nine (641) are both convex, and the object side and the image side of the lens ten (642) are both concave; the eyepiece six (660) includes a glued lens ten (642) one and a lens ten (642) two, wherein the object side and the image side of the lens ten (642) one are both concave, and the object side and the image side of the lens ten (642) two are both convex; the object side and the image side of the eyepiece two (620), the eyepiece three (630) and the eyepiece five (650) are all convex.

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