Endoscope optical system and endoscope

Abstract

The utility model discloses an endoscope optical system and an endoscope, the endoscope optical system comprises a first sub-optical system and a second sub-optical system, the first sub-optical system is used for forming a first optical channel; the second sub-optical system is used for forming a second optical channel, and the second optical channel and the first optical channel are arranged side by side; and the first sub-optical system and the second sub-optical system share one steering prism. In this way, clinical requirements of surgical robots can be met, and compared with an endoscope with the outer diameter being 10 mm or above, surgical wounds are smaller, and postoperative recovery is better facilitated; the outer diameter of the lens can be increased, so that the processing difficulty of the lens is reduced, the processing precision and the yield are improved, the good optical imaging quality is ensured, and the purpose of reducing the batch cost is also achieved; and binocular combined aberration caused by processing and assembling deviations of an independent prism in a traditional scheme can be eliminated.

Description

Technical Field

[0001] The present application relates to the technical field of endoscopes, and in particular, to an endoscope optical system and an endoscope. Background Art

[0002] Minimally invasive surgery is increasingly widely used in the field of surgical medicine. In minimally invasive surgery, an endoscope is often used as the main medical device. Through the endoscope, a doctor can directly observe the tissue morphology of internal organs and obtain real-time images of the surgical site. The viewing angles of endoscopes include 0°, 5°, 12°, 30°, 70°, 90°, etc. Doctors can select endoscopes with different viewing angles according to the location of the lesion. However, existing endoscopes usually include two independent left and right sub-optical systems, resulting in a relatively large outer diameter of the endoscope, usually more than 10 mm, and a relatively large surgical wound, which is not conducive to postoperative recovery. Summary of the Utility Model

[0003] A series of simplified concepts are introduced in the summary part of the utility model, which will be further described in detail in the specific implementation part. The summary part of the present utility model does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0004] To at least partially solve the above problems, the present application provides an endoscope optical system, which includes:

[0005] A first sub-optical system for forming a first optical channel; and

[0006] A second sub-optical system for forming a second optical channel, the second optical channel being arranged side by side with the first optical channel;

[0007] Wherein, the first sub-optical system and the second sub-optical system share a turning prism.

[0008] Optionally, the endoscope optical system includes a first prism group and a second prism group. The first prism group belongs to the first sub-optical system, and the second prism group belongs to the second sub-optical system. The first prism group and the second prism group share a turning prism.

[0009] Optionally, the first prism group and the second prism group share a support prism.

[0010] Optionally, the part of the turning prism belonging to the first sub-optical system and the part of the turning prism belonging to the second sub-optical system have the same thickness.

[0011] Optionally, the first sub-optical system includes a first lens group and a second lens group, and the first lens group and the second lens group are located on both sides of the steering prism.

[0012] The second sub-optical system includes a third lens group and a fourth lens group, and the third lens group and the fourth lens group are located on both sides of the steering prism.

[0013] Wherein, the first lens group and the third lens group are located on the same side of the steering prism, and the second lens group and the fourth lens group are located on the same side of the steering prism.

[0014] Optionally, the steering prism has a first mirror surface and a second mirror surface, the first mirror surface and the second mirror surface face away from each other in the thickness direction of the steering prism, the first lens group and the third lens group are located on the side where the first mirror surface is located, and the second lens group and the fourth lens group are located on the side where the second mirror surface is located.

[0015] Optionally, the first mirror surface and the second mirror surface have an included angle α, 0 < α ≤ 90°.

[0016] Optionally, the first lens group is located at the proximal end of the steering prism along the optical path direction, the first lens group includes at least one negative-power lens, the second lens group is located at the distal end of the steering prism along the optical path direction, and the second lens group includes at least one positive-power lens.

[0017] Optionally, the third lens group is the same as the first lens group in arrangement and structure, and the fourth lens group is the same as the third lens group in arrangement and structure.

[0018] Optionally, the first lens group includes a plano-concave negative-power lens.

[0019] Optionally, along the direction from the proximal end to the distal end along the optical path, the second lens group includes a first positive-power lens group, a second positive-power lens group, a third positive-power lens group, and a fourth negative-power lens group.

[0020] Optionally, the third positive-power lens group is arranged as a doublet lens group.

[0021] Optionally, the central axis of the second optical channel is parallel to the central axis of the first optical channel.

[0022] According to another aspect of the present application, an endoscope is provided, the endoscope includes a barrel and an endoscope optical system according to any of the above aspects, and the endoscope optical system is disposed inside the barrel.

[0023] Optionally, the outer diameter of the barrel is less than 8.8 mm.

[0024] For the endoscope optical system and endoscope according to the present application, two sub-optical systems share one deflecting prism and one set of lens barrels. The center distance between the two optical channels is reduced, so that the outer diameter of the lens barrel is reduced, and the endoscope can be designed to have a smaller size structurally. In this way, the clinical requirements of surgical robots can be met. Compared with endoscopes with an outer diameter of more than 10 mm, the surgical wound is smaller and it is more conducive to postoperative recovery.

[0025] Since the deflecting prism is shared, the thickness of the partition wall between the two sub-optical systems can be reduced, enabling the outer diameter of the lens barrel to be designed smaller. Furthermore, the outer diameter of the lens can be increased correspondingly in the optical design to ensure that the lens barrel has a smaller outer diameter. Increasing the outer diameter of the lens is beneficial to reducing the processing difficulty of the lens, improving the processing accuracy and the yield rate, ensuring good optical imaging quality, and also achieving the purpose of reducing the batch cost.

[0026] In addition, the two sub-optical systems form a whole, and this whole is assembled and calibrated. In this way, the binocular image synthesis aberration caused by the processing and assembly deviation of the independent prism in the traditional solution can be eliminated, greatly improving the 3D pairing yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The following drawings of the present application are hereby incorporated as part of the present application for understanding the present application. The embodiments of the present application shown in the drawings and their descriptions are used to explain the principles of the present application.

[0028] In the drawings:

[0029] Figure 1 is a schematic structural diagram of the endoscope optical system according to the present application.

[0030] Description of the reference numerals:

[0031] 1 Endoscope optical system

[0032] 10 First sub-optical system

[0033] 11 First prism group

[0034] 12 First lens group

[0035] 13 Second lens group

[0036] 20 Second sub-optical system

[0037] 21 Second prism group

[0038] 22 Third lens group

[0039] 23 Fourth lens group

[0040] 31 Deflecting prism

[0041] 32 First mirror

[0042] 33 Second mirror

[0043] 34 Support prism

[0044] 41 First positive focal length lens group

[0045] 42 Second positive focal length lens group

[0046] 43 Third positive focal length lens group

[0047] 44 Fourth negative focal length lens group

[0048] D Optical path direction Detailed implementation manners

[0049] In the following description, a large number of specific details are given to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features known to the art are not described.

[0050] For a thorough understanding of the present application, a detailed description will be presented in the following. Obviously, the implementation of the embodiments of the present application is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present application are described in detail below. However, in addition to these detailed descriptions, the present application can also have other embodiments.

[0051] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0052] The ordinal numbers such as "first" and "second" cited in the present application are only identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component".

[0053] It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and similar expressions used herein are only for illustrative purposes and are not restrictive.

[0054] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many different forms and should not be construed as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present application is thorough and complete, and the concept of these exemplary embodiments is fully conveyed to those of ordinary skill in the art.

[0055] In minimally invasive surgery, an endoscope is often used as the main medical device. Through the endoscope, a doctor can directly observe the tissue morphology of internal organs and obtain real-time images of the surgical site. The viewing angles of the endoscope include 0°, 5°, 12°, 30°, 70°, 90°, etc., and the doctor can select an endoscope with a different viewing angle according to the location of the lesion.

[0056] Existing endoscopes usually include two independent left and right sub-optical systems, resulting in a relatively large outer diameter of the endoscope, usually more than 10 mm, and a relatively large surgical wound, which is not conducive to postoperative recovery. The outer diameter of the lens used in the endoscope is usually below 2.6 mm, and even below 2.0 mm, which increases the processing difficulty of the lens and reduces the yield rate, thus resulting in a high cost of mass-producing the lens. In addition, since the existing endoscope includes two independent left and right sub-optical systems, after the sub-optical systems need to be separately assembled, the two sub-optical systems are assembled and calibrated by means of structural fixation, optical gluing, or both. For endoscopes with non-0° viewing angles, it is difficult to ensure the binocular image aberration introduced by the prism.

[0057] Therefore, an endoscope optical system is proposed to improve or overcome at least one of the above problems.

[0058] As Figure 1 shown, the endoscope optical system 1 includes a first sub-optical system 10 and a second sub-optical system 20. The first sub-optical system 10 is used to form a first optical channel, and the second sub-optical system 20 is used to form a second optical channel. Light can be transmitted through the first optical channel and the second optical channel respectively. The second optical channel is arranged side by side with the first optical channel. The first sub-optical system 10 and the second sub-optical system 20 share a turning prism 31, so that the first optical channel and the second optical channel are turned at the turning prism 31, and the light is turned by the turning prism 31 when it is transmitted through the first optical channel and the second optical channel.

[0059] The two sub-optical systems share a turning prism 31 and a set of lens barrels, and the center distance between the two optical channels is reduced, so that the outer diameter of the lens barrel is reduced, and the endoscope can be structurally designed to have a smaller size. In this way, the clinical needs of surgical robots can be met. Compared with endoscopes with an outer diameter of more than 10 mm, the surgical wound is smaller and more conducive to postoperative recovery.

[0060] Due to the shared deflection prism 31, the thickness of the partition wall between the two sub-optical systems can be reduced, enabling the outer diameter of the lens barrel to be designed smaller. Consequently, the outer diameter of the lens can be correspondingly increased in the optical design while ensuring that the lens barrel has a smaller outer diameter. Increasing the outer diameter of the lens is beneficial for reducing the lens processing difficulty, improving the processing accuracy and the yield rate, ensuring good optical imaging quality, and achieving the goal of reducing the batch cost.

[0061] In addition, the two sub-optical systems form an integral whole, and this whole is assembled and calibrated. In this way, the binocular image synthesis aberration caused by the processing and assembly deviations of the independent prisms in the traditional solution can be eliminated, greatly improving the 3D pairing yield rate.

[0062] Optionally, the part of the deflection prism 31 belonging to the first sub-optical system 10 and the part of the deflection prism 31 belonging to the second sub-optical system 20 can have the same thickness. The deflection prism 31 has a first mirror surface 32 and a second mirror surface 33, and the first mirror surface 32 and the second mirror surface 33 face away from each other in the thickness direction of the deflection prism 31. The first mirror surface 32 is a plane, and the second mirror surface 33 is also a plane. With such a setting, the deflection angles of the first optical channel and the second optical channel can be designed to be the same. Of course, if necessary and / or desired, the part of the deflection prism 31 belonging to the first sub-optical system 10 and the part of the deflection prism 31 belonging to the second sub-optical system 20 can have different thicknesses. The first mirror surface 32 and the second mirror surface 33 are not arranged in parallel. To achieve deflection, the first mirror surface 32 and the second mirror surface 33 have an included angle α, where 0 < α ≤ 90°. The included angle α can be appropriate angles such as 5°, 10°, 12°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, etc. Thus, the endoscope can have a non-zero viewing angle less than or equal to 90°, and the viewing angle of the endoscope can be 5°, 10°, 12°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, etc.

[0063] Optionally, the central axis of the second optical channel is parallel to the central axis of the first optical channel. In this way, light can be transmitted along parallel optical path directions D in these two optical channels.

[0064] The endoscope optical system 1 includes a first prism group 11 and a second prism group 21. Each of these two prism groups may include more than two prisms, or a single prism may also form a prism group. That is to say, the prism group can be a combination of more than two prisms or can be composed of a single prism. The first prism group 11 belongs to the first sub-optical system 10, and the second prism group 21 belongs to the second sub-optical system 20. The first prism group 11 and the second prism group 21 share a turning prism 31. In addition to this shared turning prism 31, the first prism group 11 and the second prism group 21 may also include other prisms, such as a support prism 34. If necessary and / or desirable, the first prism group 11 and the second prism group 21 include their respective dedicated turning prisms.

[0065] In some embodiments, the first prism group 11 and the second prism group 21 share the support prism 34. The support prism 34 may be disposed on the side where the first mirror surface 32 is located and / or on the side where the second mirror surface 33 is located. Exemplarily, Figure 1 it is shown that the support prism 34 is disposed on the side where the second mirror surface 33 is located. The turning prism 31 is used to change the direction of light, or rather the light path. The support prism 34 is used to support the turning prism 31 so that the turning prism 31 is easy to install and maintain stability. The support prism 34 is in surface-to-surface contact with the turning prism 31. In this solution, the turning prism 31 is supported by the shared support prism 34, and the size of the support prism 34 can be designed according to the size of the turning prism 31. While providing support, it avoids increasing the outer diameter of the lens barrel.

[0066] The first sub-optical system 10 includes a first lens group 12 and a second lens group 13. The first lens group 12 and the second lens group 13 are located on both sides of the turning prism 31. The second sub-optical system 20 includes a third lens group 22 and a fourth lens group 23. The third lens group 22 and the fourth lens group 23 are located on both sides of the turning prism 31. Each of these lens groups may include more than two lenses or may be composed of a single lens. The first lens group 12 and the third lens group 22 are located on the same side of the turning prism 31, and the second lens group 13 and the fourth lens group 23 are located on the same side of the turning prism 31. The first optical channel and the second optical channel are formed by the lens groups both before and after turning, so that different types of lenses can be selected according to different requirements for light before and after turning.

[0067] In some embodiments, the first lens group 12 and the third lens group 22 are located on the side where the first mirror surface 32 is located, and the second lens group 13 and the fourth lens group 23 are located on the side where the second mirror surface 33 is located.

[0068] Of course, if necessary and / or desirable, the first sub-optical system 10 includes a lens located on one side of the steering prism 31; the first sub-optical system 10 includes a lens located on the side where the first mirror surface 32 of the steering prism 31 is located. The second sub-optical system 20 includes a lens located on one side of the steering prism 31; the second sub-optical system 20 includes a lens located on the side where the first mirror surface 32 of the steering prism 31 is located.

[0069] In some embodiments, the first mirror surface 32 faces the proximal end in the optical path direction D, and the second mirror surface 33 faces the distal end in the optical path direction D. Thus, the first lens group 12 is located at the proximal end of the steering prism 31 along the optical path direction D, and the second lens group 13 is located at the distal end of the steering prism 31 along the optical path direction D. The third lens group 22 is the same as the first lens group 12 in arrangement and structure, and the fourth lens group 23 is the same as the third lens group 22 in arrangement and structure. Specifically, in terms of arrangement, the third lens group 22 is located at the proximal end of the steering prism 31 along the optical path direction D, and the fourth lens group 23 is located at the distal end of the steering prism 31 along the optical path direction D. In terms of structure, for the sake of simplicity, the first lens group 12 and the second lens group will be described as examples below.

[0070] The first lens group 12 includes at least one negative-power lens, and the second lens group 13 includes at least one positive-power lens. In some embodiments, the first lens group 12 includes a plano-concave negative-power lens. The second lens group 13 includes a first positive-power lens group 41, a second positive-power lens group 42, a third positive-power lens group 43, and a fourth negative-power lens group 44. The first positive-power lens group 41, the second positive-power lens group 42, the third positive-power lens group 43, and the fourth negative-power lens group 44 are arranged in sequence in the direction from the proximal end to the distal end along the optical path direction D.

[0071] Of course, if necessary and / or desirable, any one of these power lens groups can be replaced by a single power lens. Optionally, the first positive-power lens group 41 is replaced by a single positive-power lens, the second positive-power lens group 42 is replaced by a single positive-power lens, the third positive-power lens group 43 is replaced by a single positive-power lens, and / or the fourth negative-power lens group 44 is replaced by a single negative-power lens.

[0072] Optionally, the third positive-power lens group 43 is arranged as a doublet lens group.

[0073] According to another aspect of the present application, an endoscope is provided. The endoscope includes a barrel and the above-described endoscope optical system 1, and the endoscope optical system 1 is disposed inside the barrel. Since the two optical systems in the endoscope optical system 1 share a single steering prism 31, the outer diameter of the barrel can be set to be less than 8.8 mm.

[0074] Unless otherwise defined, the technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the technical field of this application. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The features described in one embodiment herein can be applied to another embodiment alone or in combination with other features, unless the feature is not applicable or otherwise stated in that other embodiment.

[0075] This application has been described through the above embodiments. However, it should be understood that the above embodiments are only for the purpose of illustration and example, and this application is not limited to the above embodiments. According to the teachings of this application, more variations and modifications can be made, and these variations and modifications all fall within the scope of protection required by this application.

Claims

1. An endoscope optical system, characterized in that, The endoscope optical system includes: A first sub-optical system for forming a first optical channel; and A second sub-optical system for forming a second optical channel, the second optical channel being arranged side by side with the first optical channel; Wherein, the first sub-optical system and the second sub-optical system share a turning prism.

2. The endoscopic optical system according to claim 1, characterized in that, The endoscope optical system includes a first prism group and a second prism group. The first prism group belongs to the first sub-optical system, and the second prism group belongs to the second sub-optical system. The first prism group and the second prism group share a turning prism.

3. The endoscopic optical system according to claim 2, characterized in that, The first prism group and the second prism group share a support prism.

4. The endoscopic optical system according to claim 2, wherein The part of the turning prism belonging to the first sub-optical system and the part of the turning prism belonging to the second sub-optical system have the same thickness.

5. The endoscopic optical system according to any one of claims 1 to 4, characterized in that, The first sub-optical system includes a first lens group and a second lens group, and the first lens group and the second lens group are located on both sides of the turning prism. The second sub-optical system includes a third lens group and a fourth lens group, and the third lens group and the fourth lens group are located on both sides of the turning prism. Wherein, the first lens group and the third lens group are located on the same side of the turning prism, and the second lens group and the fourth lens group are located on the same side of the turning prism.

6. The endoscopic optical system according to claim 5, characterized in that, The turning prism has a first mirror surface and a second mirror surface. The first mirror surface and the second mirror surface face away from each other in the thickness direction of the turning prism. The first lens group and the third lens group are located on the side where the first mirror surface is located, and the second lens group and the fourth lens group are located on the side where the second mirror surface is located.

7. The endoscopic optical system according to claim 6, characterized in that, The first mirror surface and the second mirror surface have an included angle α, 0 < α ≤ 90°.

8. The endoscopic optical system according to claim 5, characterized in that, The first lens group is located at the proximal end of the turning prism along the optical path direction, and the first lens group includes at least one negative-power lens. The second lens group is located at the distal end of the turning prism along the optical path direction, and the second lens group includes at least one positive-power lens.

9. The endoscopic optical system according to claim 8, wherein The third lens group is the same as the first lens group in arrangement and structure, and the fourth lens group is the same as the third lens group in arrangement and structure.

10. The endoscopic optical system according to claim 8, characterized in that, The first lens group includes a plano-concave negative-power lens.

11. The endoscopic optical system according to claim 8, wherein Along the direction from the proximal end to the distal end along the optical path, the second lens group includes a first positive-power lens group, a second positive-power lens group, a third positive-power lens group, and a fourth negative-power lens group.

12. The endoscopic optical system according to claim 11, wherein The third positive-power lens group is arranged as a doublet lens group.

13. The endoscopic optical system according to any one of claims 1 to 4, characterized in that, The central axis of the second optical channel is parallel to the central axis of the first optical channel.

14. An endoscope, characterized in that, The endoscope includes a lens barrel and the endoscope optical system according to any one of claims 1 to 13, and the endoscope optical system is disposed within the lens barrel.

15. The endoscope according to claim 14, characterized in that, The outer diameter of the lens barrel is less than 8.8 mm.

Images