Endoscope system and endoscope camera optical system integrated design method

Abstract

The present invention relates to an integrated design method for an endoscope system and an endoscope camera optical system. The endoscope system includes an objective lens module, a relay module, an eyepiece module, an optical interface optical path module and a digital ultra-high-definition camera arranged in sequence along the optical path direction. The image formed by the objective lens module is projected to the optical interface optical path module in a non-parallel light manner / divergent light manner after passing through the relay module and the eyepiece module. The present invention achieves ultra-high resolution of the integration of an optical endoscope and an endoscope camera system by improving the resolution of the system. The resolution is limited by the aperture angle of the image side, which can be obtained from the formula 2tanu'=D / f'. The relative aperture and entrance pupil diameter of the system need to be improved. The relative aperture of the system includes the relative aperture of the objective lens module, the relative aperture of the eyepiece and the relative aperture of the optical interface. The relative apertures mentioned in this patent are all relative apertures of the system, and the entrance pupil diameter and exit pupil diameter are required to be improved at the same time. For example, the entrance pupil diameter of existing #imgabs0# laparoscope products is generally 0.2mm~0.4mm, the exit pupil diameter is 1mm~2mm, and the relative aperture is 1:10. This solution takes the overall system into consideration, with an entrance pupil diameter of 0.6mm, an exit pupil diameter of 3mm~6mm, and a relative aperture of 1:4~1:6. It can achieve a clarity of MTF>0.2@120lp / mm (i.e., 120 pairs of lines can be resolved per millimeter) in the full field of view of different products with a field of view angle of 50° to 120°.

Description

Technical Field

[0001] The present invention relates to an endoscope optical system, and in particular to an integrated endoscope and an endoscope optical system.

[0002] design method. Background Art

[0003] With the rapid development of science and technology, the use of endoscopes has become more and more widespread, whether in the field of medical technology, such as ear endoscopes, nasal endoscopes, laryngeal endoscopes, laparoscopes, urological endoscopes, gynecological endoscopes, arthroscopy, etc.; or in the industrial field, such as flaw detection endoscopes, inspection endoscopes, etc. However, the existing endoscopes are almost completely used in combination with camera systems, from the initial rigid endoscope camera host 330 lines, 430 lines, 480 lines, to 1920×1080P full HD camera system, from CCD chips to CMOS chips, and currently using CMOS chips can reach 3840×21608 million pixel 4K ultra-high-definition camera standards. However, due to the limitations of the optical structure, optical endoscopes cannot reach the ultra-high-definition level, which has affected the overall image display effect. Summary of the invention

[0004] In view of the technical problems existing in the prior art, the present invention proposes an endoscope system, which includes an objective lens module, a relay module, an eyepiece module, an optical interface optical path module and a digital ultra-high-definition camera arranged in sequence along the optical path direction, and is characterized in that the image formed by the objective lens module is projected to the optical interface optical path module in the form of non-parallel light and divergent light after passing through the relay module and the eyepiece module.

[0005] In the endoscope system as described above, the endoscope is a hard endoscope.

[0006] In the endoscope system as described above, the non-parallel light and divergent light forms a high-definition image on the digital ultra-high-definition camera after passing through the optical interface light path module.

[0007] In the endoscope system as described above, the imaging quality of the image formed on the digital ultra-high definition camera is better than the imaging quality of the image output by the optical interface light path module.

[0008] In the endoscope system as described above, the imaging quality of the image formed on the digital ultra-high-definition camera is better than the imaging quality of the image formed on the visual surface of the eyepiece module.

[0009] For the endoscope system as described above, the relative aperture W of the system is D / f', wherein W is the relative aperture; D is the entrance pupil diameter of the entire system, i.e., the entrance pupil diameter of the visual system; f' is the combined focal length of the system, f'=(f'o·f'C) / f'e, wherein f'o is the focal length of the objective lens module, f'C is the focal length of the optical interface light path module, and f'e is the focal length of the eyepiece.

[0010] The endoscope system as described above, wherein the relative aperture of the system is 1:4-1:6.

[0011] In the endoscope system as described above, the entrance pupil diameter of the objective lens module for products of different specifications is 0.2 mm to 1 mm.

[0012] In the endoscope system as described above, the exit pupil diameter of the eyepiece module is 3mm-6mm.

[0013] In the endoscope system as described above, the entrance pupil diameter of the objective lens module is 0.2 mm to 1 mm, and the exit pupil diameter of the eyepiece module is 3 mm to 6 mm.

[0014] An endoscope system as described above, wherein the system is used for a spherical or aspherical endoscope.

[0015] The endoscope system as described above is used for endoscopes with an outer diameter of 1.9 mm, 2.7 mm, 4 mm, 5 mm, 6 mm, 8 mm, and 10 mm.

[0016] As described above, the viewing angle of the endoscope system can be 0°, 30°, 45° or above 70°.

[0017] In the endoscope system as described above, the length from the objective lens module to the eyepiece lens module in the system can be of any length.

[0018] According to another aspect of the present invention, a method for integrated design of an endoscope camera optical system is proposed, wherein the system comprises an objective lens module, a relay module, an eyepiece module, an optical interface optical path module and a digital ultra-high-definition camera arranged in sequence along the optical path direction, and the relative aperture of the system is increased by increasing the exit pupil diameter of the eyepiece module, thereby improving the resolution of the image imaged on the digital ultra-high-definition camera.

[0019] According to the design method described above, the exit pupil diameter of the eyepiece module is increased to 3mm-6mm.

[0020] The design method described above improves the resolution of the image formed on the digital ultra-high-definition camera by increasing the entrance pupil diameter of the objective lens module.

[0021] According to the design method described above, the entrance pupil diameter of the objective lens module is increased to 0.2 mm to 1 mm.

[0022] According to the design method described above, the exit pupil diameter of the eyepiece module is increased to 3 mm-6 mm, while the entrance pupil diameter of the objective lens module is increased to 0.2 mm-1 mm.

[0023] According to the design method described above, the relative aperture W of the system is D / f', wherein W is the relative aperture; D is the entrance pupil diameter of the entire system, i.e., the entrance pupil diameter of the visual system; f' is the combined focal length of the system, f'=(f'o·f'C) / f'e, wherein f'o is the focal length of the objective lens module, f'C is the focal length of the optical interface optical path module, and f'e is the focal length of the eyepiece.

[0024] According to the design method described above, the relative aperture of the system is 1:4-1:6.

[0025] The design method as described above is used for a rigid endoscope.

[0026] The design method as described above is used for a spherical or aspherical endoscope.

[0027] The design method described above is used for the system with an appearance diameter of 1.9mm, 2.7mm, 4mm, 5mm, 6mm, 8mm,

[0028] 10mm endoscope.

[0029] According to the design method described above, the viewing angle of the system can be 0°, 30°, 45° or above 70°.

[0030] According to the design method described above, the length from the objective lens module to the eyepiece module in the system can be of any length.

[0031] According to another aspect of the present invention, an endoscope for use in the endoscope system as described above is provided, which includes the objective lens module, the relay module and the eyepiece module.

[0032] According to another aspect of the present invention, an endoscope for use in the endoscope system as described above is provided, which includes the objective lens module, the relay module, the eyepiece module and the optical interface light path module.

[0033] According to another aspect of the present invention, an optical adapter interface for the endoscope system as described above is provided, which includes the optical interface light path module.

[0034] The present invention improves the overall relative aperture and the resolution by increasing the entrance pupil diameter and the exit pupil diameter of the endoscope optical system, and optimizes the design of the endoscope system as a whole without considering the image quality of each part. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The preferred embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0036] Figure 1 is a schematic diagram of an endoscope optical system according to an embodiment of the present invention.

[0037] Figure 2 is a schematic diagram of an endoscope optical system according to an embodiment of the present invention.

[0038] Figure 3 Schematic diagram of an objective lens module of an endoscope optical system according to an embodiment of the present invention.

[0039] Figure 4 is a schematic diagram of a relay module of an endoscope optical system according to an embodiment of the present invention.

[0040] Figure 5 is a schematic diagram of a field lens of an endoscope optical system according to an embodiment of the present invention.

[0041] Figure 6 is a schematic diagram of an eyepiece of an endoscope optical system according to an embodiment of the present invention.

[0042] Figure 7 is a schematic diagram of an optical interface light path module according to an embodiment of the present invention.

[0043] Figure 8 This is an MTF diagram of an endoscope system according to an embodiment of the present invention.

[0044] Fig. 9 This is an overall MTF diagram of the objective lens module and the relay module according to an embodiment of the present invention.

[0045] Fig.10 This is an eyepiece MTF diagram of an embodiment of the present invention.

[0046] Fig.11 This is an optical MTF diagram of an optical interface according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the following detailed description, reference may be made to the various specification drawings that are part of the present application and are used to illustrate specific embodiments of the present application. In the accompanying drawings, similar reference numerals describe substantially similar components in different figures. The various specific embodiments of the present application are described in sufficient detail below so that a person of ordinary skill in the art with relevant knowledge and skills in the art can implement the technical solutions of the present application. It should be understood that other embodiments may also be used or structural, logical or characteristic changes may be made to the embodiments of the present application.

[0049] The present invention proposes a new integrated optical system for endoscopes, which can significantly improve the resolution of the endoscope; and in some embodiments of the present invention, the cost of the endoscope will not be significantly increased.

[0050] Figure 1 1 is a schematic diagram of an endoscope optical system according to an embodiment of the present invention. As shown in the figure, the endoscope system 100 includes: an objective lens module 101, a relay module 102, an eyepiece module 103, an optical interface light path module 104, and an imaging device 105. The imaging device 105 can be a digital ultra-high-definition camera. The objective lens module 101 can include an entrance pupil 106 and a plurality of lenses for imaging the area to be observed. The entrance pupil 106 can be similar to a diaphragm, which is used to limit the light entering the objective lens module. The relay module 102 includes a plurality of lenses for imaging the light imaged by the objective lens module multiple times, thereby transmitting the image formed by the objective lens module. The eyepiece module 103 includes a plurality of lenses for magnifying the image received from the relay module 102. The eyepiece module 103 includes an exit pupil 107. The optical interface light path module 104 includes a plurality of lenses for imaging the imaging light from the eyepiece module 103 onto the imaging surface of the imaging device 105. The optical interface light path module 104 is adjacent to the eyepiece module 103 , so the exit pupil 107 of the eyepiece module 103 can also serve as the entrance pupil of the optical interface light path module. Further, the endoscope may include a display 108 for displaying images from the imaging device 106 .

[0051] Those skilled in the art should understand that, since the optical interface optical path module 104 is adapted to the imaging device 105. In some embodiments, when the parameters of the optical interface optical path module 104 and the imaging device 105 are given, the optical system of the endoscope may only include the objective lens module 101, the relay module 102, and the eyepiece module 103. The designer designs the objective lens module 101, the relay module 102, and the eyepiece module 103 according to the parameters of the optical interface optical path module 104 and the imaging device 105. Therefore, the case where the optical system of the endoscope does not include the optical interface optical path module 104 and the imaging device 105 is also included in the protection scope of the present invention. Further, when the optical system of the endoscope may only include the objective lens module 101, the relay module 102, and the eyepiece module 103, when the imaging device 105 is given, the designer may only design the optical interface optical path module 104 and provide the optical interface optical path module 104 separately. Therefore, the optical interface optical path module 104 is also within the protection scope of the present invention.

[0052] In the existing endoscope optical system design, the objective lens module 102 and the relay module 103 are designed and tested as a whole; the eyepiece module 104 is designed and tested separately. The optical interface light path module 104 is designed according to the exit pupil and field of view of the eyepiece module 103 and the imaging device 105 to ensure the imaging quality on the imaging surface of the imaging device 105. Those skilled in the art have tried for a long time to improve the resolution of the endoscope and the imaging quality by improving the design of the objective lens module 102 and the relay module 103, the eyepiece module 104 or the optical interface light path module 104, but have not been successful.

[0053] In order to illustrate the structure of the endoscope optical system of the present invention, a new parameter is defined: the overall relative aperture W, where

[0054] W=D / f' (1)

[0055] Wherein, W is the relative aperture. D is the entrance pupil diameter of the optical system; specifically, D may be the diameter of the entrance pupil 106 of the objective lens module 101. f' is the combined focal length of the optical system, which conforms to the following definition:

[0056] f'=(f'o·f'C) / f'e (2)

[0057] Wherein, f′o is the focal length of the objective lens module 101 , f′c is the focal length of the optical interface light path module 104 , and f′e is the focal length of the eyepiece module 103 .

[0058] For an optical system, the resolution can be determined by the image-side aperture angle (represented here as u'). Generally speaking, the larger the image-side aperture angle, the higher the resolution. The image-side aperture angle u' conforms to the following formula:

[0059] 2tanu'=DC / f'C (3)

[0060] Wherein, DC is the entrance pupil of the optical interface optical path module 104. f'C is the focal length of the optical interface optical path module 104. Since the entrance pupil 108 of the optical interface optical path module 104 is the exit pupil D' of the entire endoscope optical system, the following formula is obtained:

[0061] Dc=D' (4)

[0062] Thus, we can get the following formula:

[0063] 2tanu'=D' / f'C (5)

[0064] Due to the reversibility of the optical path, the optical system of the endoscope can be approximately regarded as an inverted telescope. Therefore, there is the following formula:

[0065] D' / f'C=D / f' (6)

[0066] Thus, we can get the formula

[0067] 2tanu'=D / f' (7)

[0068] It can be seen from this that the larger the relative aperture W of the optical system, the larger the image side aperture angle u', and the higher the resolution of the optical system.

[0069] According to one embodiment of the present invention, the overall relative aperture W is in the range of 1:4-1:6. For example, the entrance pupil diameter of existing laparoscope products is generally 0.2mm-0.4mm, the exit pupil diameter is 1mm-2mm, and the relative aperture is 1:10. In some embodiments of the present invention, the entrance pupil diameter is 0.6mm, the exit pupil diameter is 3mm-6mm, and the relative aperture is 1:4-1:6, which can achieve a clarity of MTF>0.2@120lp / mm (i.e., 120 pairs of lines can be resolved per millimeter) in the full field of view of different products with a field of view angle of 50° to 120°.

[0070] Further, according to formula (1), increasing the entrance pupil 107 of the objective lens module 101 of the optical system is beneficial to improving the resolution of the optical system. According to an embodiment of the present invention, the entrance pupil diameter of the objective lens module for products of different specifications is 0.2 mm to 1 mm.

[0071] As mentioned above, from the perspective of the optical system, the optical system of the endoscope can be approximately regarded as an inverted telescope.

[0072] The exit pupil D' of the eyepiece module 103 conforms to the following formula:

[0073] D'=D·f'e / f'o (8)

[0074] Wherein, D' is the exit pupil diameter of the optical system, D is the entrance pupil diameter of the optical system, f'o is the focal length of the objective lens module 101, f'c is the focal length of the optical interface optical path module 104, and f'e is the focal length of the eyepiece module 103.

[0075] Referring to formula (2), when D remains unchanged, the larger D' is, the larger f'e / f'o is. Generally speaking, the focal length of the optical interface optical path module 104 is unchanged, so the smaller f'=(f'o·f'C) / f'e is, the larger W=D / f' is.

[0076] Therefore, increasing the exit pupil diameter D' of the optical system, that is, the exit pupil diameter of the eyepiece module, is beneficial to improving the resolution of the system.

[0077] According to one embodiment of the present invention, the exit pupil diameter of the eyepiece module is 3mm-6mm.

[0078] According to one embodiment of the present invention, the size of the entrance pupil 106 and the exit pupil 107 affects the resolution of the endoscope optical system. However, if the entrance pupil or the exit pupil is too large, too much stray light is introduced, and the clarity and resolution of the image will also be affected. According to one embodiment of the present invention, the entrance pupil diameter of the objective lens module is 0.2mm to 1mm, and the exit pupil diameter of the eyepiece module is 3mm-6mm.

[0079] From the above description, it can be seen that the present invention abandons the disadvantages of the separate designs of the objective lens module 102 and the relay module 103, the eyepiece module 104 or the optical interface optical path module 104, adopts an integrated design concept, fully considers the reversibility of the optical path, and can greatly improve the resolution of the endoscope. In some embodiments of the present invention, the clarity of the endoscope using the optical system of the present invention can reach MTF>0.2@120lp / mm; and the optical system of the present invention hardly increases any cost, thereby solving the problem of improving the resolution of the endoscope that has not been solved in the field for a long time.

[0080] Furthermore, the solution of the present invention does not affect other aspects of the endoscopic optical system. According to one embodiment of the present invention, the endoscopic optical system is used for a spherical or aspherical endoscope. According to one embodiment of the present invention, the endoscopic optical system is used for an endoscope with an external diameter of 1.9mm, 2.7mm, 4mm, 5mm, 6mm, 8mm, and 10mm. According to one embodiment of the present invention, the viewing angle of the endoscopic optical system can be 0°, 30°, 45°, or above 70°. According to one embodiment of the present invention, the length from the objective lens module to the eyepiece module in the endoscopic optical system can be any length.

[0081] The following is an explanation of the endoscope system of the present invention with a viewing angle of 30°, and some comparisons are made with the existing endoscope optical system to better illustrate the characteristics of the present invention. It should be understood by those skilled in the art that this embodiment is only used to illustrate the technical solution of the present invention and is not used to limit the scope of the present invention.

[0082] Figure 2 is a schematic diagram of an endoscope optical system according to an embodiment of the present invention. Figure 3 Schematic diagram of an objective lens module of an endoscope optical system according to an embodiment of the present invention. Figure 4 is a schematic diagram of a relay module of an endoscope optical system according to an embodiment of the present invention. Figure 5 is a schematic diagram of a field lens of an endoscope optical system according to an embodiment of the present invention. Figure 6 FIG. 1 is a schematic diagram of an eyepiece module of an endoscope optical system according to an embodiment of the present invention. Figure 7 is a schematic diagram of an optical interface light path module according to an embodiment of the present invention.

[0083] In this embodiment, the relative aperture of the existing endoscope is 1:8~1:10, which cannot achieve high-definition resolution. The relative aperture of this embodiment is 1:4.5, and the relative illumination can reach 2~4 times that of the existing endoscope. Specifically, the entrance pupil diameter of the existing endoscope is 0.2mm~0.4mm, and the entrance pupil diameter of this embodiment is 0.6mm. The 30° steering prism is unfolded into a flat entrance pupil position 2mm behind the first negative lens. In this embodiment, the exit pupil diameter of the existing endoscope is 1mm~2mm, and the exit pupil diameter of this embodiment is 5mm, and the exit pupil position is 4mm after the rear lens of the eyepiece module. In this embodiment, the entrance pupil diameter of the optical interface optical module is 5mm, and the entrance pupil position is consistent with the exit pupil position of the eyepiece module. In this embodiment, the endoscope can achieve an observation direction with a viewing angle of 30° and an observation range of a field of view angle of 70°.

[0084] Specifically, if Figure 2 As shown, the optical system of the endoscope includes an entrance pupil 01 of an objective lens module, an objective lens module 02, a relay module 03, a field lens 04, a field aperture, an eyepiece module 05, an optical interface light path module 06 and a CCD (CMOS) for imaging.

[0085] Figure 3 The composition of the objective lens module and the optical path therein are shown. As shown in the figure, the objective lens module includes 2 single lenses, 1 turning prism, 1 triplet lens, and 3 doublet lenses. Through the objective lens module of the optical system, the area to be observed can form a clear image after passing through the objective lens module.

[0086] Figure 4The relay module and the optical path therein are shown. As shown in the figure, the relay module includes 3 groups of identical image relay groups, each of which includes 2 doublet lenses. After multiple imaging of the relay module, the image formed by the object lens module is transmitted in the relay module. The relay module of the optical system of the present invention can include any number of image relay groups, so the object lens module can be of any length to the eyepiece module.

[0087] Figure 5 The field lens, the field stop and the related optical path are shown. The field lens is set at a certain distance behind the last group of lenses in the relay module to fold the image transmitted by the relay and reduce the aperture of the eyepiece module optical system and the optical interface optical path module. In this embodiment, the diameter of the field stop is 4.1mm, limiting the size of the field of view to 75°. Figure 6 The eyepiece module and the optical path therein are shown. As shown in the figure, the eyepiece module includes two double-cemented lenses. In this embodiment, the diameter of the entrance pupil of the eyepiece module is 5 mm, and is set 4 mm behind the last group of lenses in the eyepiece module. Figure 6 As shown, the light emitted from the eyepiece module is divergent and non-parallel, not parallel light. It is generally believed that it is a more reasonable choice for the eyepiece module to emit parallel light. However, according to the optical system of the present invention, the light emitted from the eyepiece module is non-parallel light, which will be more conducive to improving the resolution of the endoscope optical system. Figure 7 The optical interface optical path module and the optical path therein are shown. As shown in the figure, the optical interface optical path module includes 3 double-cemented lenses. It should be noted that Figure 6 The exit pupil of the middle eyepiece module is Figure 7 The entrance pupil of the optical interface optical path module. After passing through the optical interface optical path module, the light from the eyepiece module forms a high-definition image on the imaging surface.

[0088] The so-called high-definition image has a resolution of MTF>0.2@40lp / mm or above, MTF>0.2@50lp / mm or above, MTF>0.2@60lp / mm or above, MTF>0.2@70lp / mm or above, MTF>0.2@80lp / mm or above, MTF>0.2@90lp / mm or above, MTF>0.2@100lp / mm or above, MTF>0.2@110lp / mm or above, MTF>0.2@120lp / mm or above, MTF>0.2@130lp / mm or above, MTF>0.2@140lp / mm or above, or MTF>0.2@150lp / mm or above.

[0089] Figure 8 This is an MTF diagram of an endoscope system according to an embodiment of the present invention. In this embodiment, the resolution of the optical system can be as high as MTF>0.2@120lp / mm. Furthermore, Fig. 9 This is the overall MTF diagram of the objective lens module and relay according to an embodiment of the present invention. Fig.10 This is an MTF diagram of the eyepiece module according to an embodiment of the present invention. Fig.11 This is an optical MTF diagram of an optical interface according to an embodiment of the present invention.

[0090] It is worth noting that in this embodiment, reference Fig. 9 , the imaging quality of the objective lens module is only to achieve MTF>0.2@40lp / mm. Fig.10 , the imaging quality of the eyepiece module only reaches MTF>0.2@20lp / mm. Fig.11 , the imaging quality of the optical interface optical path module reaches an unexpected MTF>0.1@120lp / mm. In other words, the imaging quality of the image formed on the imaging surface of the imaging device is better than the imaging quality of the image output by the objective lens module and the intermediate optical group, or the eyepiece module, or the optical interface optical path module alone. The optical transfer function of the objective lens module and the relay module, the eyepiece module, and the optical interface optical path module does not need to consider the imaging quality separately, but the overall optical transfer function (such as Figure 8 ) can meet the design requirements.

[0091] According to one embodiment of the present invention, an integrated design method for an endoscope optical system is proposed. The design method can be applied to the above optical system, which includes an objective lens module, a relay module, and an eyepiece module arranged in sequence along the optical path direction, and the method includes: increasing the exit pupil diameter of the eyepiece module to increase the relative aperture of the system; or, increasing the entrance pupil diameter of the objective lens module to increase the relative aperture of the system. In some embodiments, the exit pupil diameter of the eyepiece module is 3mm-6mm. In other embodiments, the entrance pupil diameter of the objective lens module is 0.2mm~1mm.

[0092] According to one embodiment of the present invention, the relative aperture of the system can be increased by increasing the exit pupil diameter of the eyepiece module and the entrance pupil diameter of the objective lens module at the same time. In some embodiments, the entrance pupil diameter of the objective lens module is 0.2 mm to 1 mm, and the exit pupil diameter of the eyepiece module is 3 mm to 6 mm.

[0093] Further, according to an embodiment of the present invention, the optical system further comprises an optical interface optical path module and an imaging device sequentially arranged along the optical path direction, wherein the optical interface optical path module is adjacent to the eyepiece module. The method further comprises: setting the relative aperture of the system to 1:4-1:6, wherein the relative aperture of the system W=D / f', wherein W is the relative aperture; D is the entrance pupil diameter of the optical system; f' is the combined focal length of the optical system, f'=(f'o·f'C) / f'e, wherein f'o is the focal length of the objective lens module, f'C is the focal length of the optical interface optical path module, and f'e is the focal length of the eyepiece module.

[0094] According to one embodiment of the present invention, the system is used for a spherical or aspherical endoscope optical system. According to one embodiment of the present invention, the system is used for an endoscope optical system with an apparent diameter of 1.9 mm, 2.7 mm, 4 mm, 5 mm, 6 mm, 8 mm, or 10 mm.

[0095] According to one embodiment of the present invention, the viewing angle of the system may be 0°, 30°, 45° or greater than 70°.

[0096] According to one embodiment of the present invention, the length between the objective lens module and the eyepiece lens module can be arbitrary.

[0097] According to one embodiment of the present invention, an endoscope is provided, which includes: the endoscope optical system as described above; or the endoscope optical system designed by the design method as described above. According to one embodiment of the present invention, the endoscope is a hard endoscope.

[0098] According to one embodiment of the present invention, a method for manufacturing an endoscope is proposed, comprising the following steps: providing an objective lens module, a relay module, an eyepiece module, an optical interface optical path module and an imaging device along an optical path direction; setting an exit pupil diameter of the eyepiece module or an entrance pupil diameter of the objective lens module to have an increased relative aperture of the system; and adjusting one or more of the objective lens module, the relay module, the eyepiece module and the optical interface optical path module so that the area to be observed forms a high-definition image on the imaging surface of the imaging device.

[0099] According to one embodiment of the present invention, the resolution of the high-definition image is MTF>0.2@40lp / mm or above, MTF>0.2@50lp / mm or above, MTF>0.2@60lp / mm or above, MTF>0.2@70lp / mm or above, MTF>0.2@80lp / mm or above, MTF>0.2@90lp / mm or above, MTF>0.2@100lp / mm or above, MTF>0.2@110lp / mm or above, MTF>0.2@120lp / mm or above, MTF>0.2@130lp / mm or above, MTF>0.2@140lp / mm or above, or MTF>0.2@150lp / mm or above.

[0100] According to one embodiment of the present invention, a method for manufacturing an endoscope optical system is proposed, comprising: providing an objective lens module, a relay module, and an eyepiece module along an optical path direction; providing parameters of an optical interface optical path module and an imaging device adapted to the optical system; setting an exit pupil diameter of the eyepiece module or an entrance pupil diameter of the objective lens module to have an increased relative aperture of the system; and adjusting one or more of the objective lens module, the relay module, and the eyepiece module so that an image of an area to be observed formed through the objective lens module can form a high-definition image on an imaging surface of an imaging device defined by the parameters of the adapted optical interface optical path module and the imaging device after being emitted through the relay module and the eyepiece module.

[0101] According to one embodiment of the present invention, the resolution of the high-definition image is MTF>0.2@40lp / mm or above, MTF>0.2@50lp / mm or above, MTF>0.2@60lp / mm or above, MTF>0.2@70lp / mm or above, MTF>0.2@80lp / mm or above, MTF>0.2@90lp / mm or above, MTF>0.2@100lp / mm or above, MTF>0.2@110lp / mm or above, MTF>0.2@120lp / mm or above, MTF>0.2@130lp / mm or above, MTF>0.2@140lp / mm or above, or MTF>0.2@150lp / mm or above.

[0102] According to one embodiment of the present invention, an optical interface light path module for an endoscope optical system is proposed, which includes a plurality of lenses, wherein the plurality of lenses receive light rays emitted after a relay module and an eyepiece module in the form of non-parallel light and divergent light, formed by an image of an area to be observed through an objective lens module, and emit the light rays to form a high-definition image on an imaging surface of an imaging device.

[0103] According to one embodiment of the present invention, the resolution of the high-definition image is MTF>0.2@40lp / mm or above, MTF>0.2@50lp / mm or above, MTF>0.2@60lp / mm or above, MTF>0.2@70lp / mm or above, MTF>0.2@80lp / mm or above, MTF>0.2@90lp / mm or above, MTF>0.2@100lp / mm or above, MTF>0.2@110lp / mm or above, MTF>0.2@120lp / mm or above, MTF>0.2@130lp / mm or above, MTF>0.2@140lp / mm or above, or MTF>0.2@150lp / mm or above.

[0104] The endoscope optical system and endoscope of the present invention change the system resolution of the optical path by increasing the overall relative aperture of the system, and this design scheme of increasing the relative aperture can be applied not only to 30° laparoscopes, but also to various external diameters, various endoscope lengths, and various viewing angles, such as 0°, 30°, 45°, 70°, not limited to the diameter specifications, length specifications, and viewing angle specifications listed above. For example: laparoscopes 0°, 30°, diameters 10mm, diameters 5mm or 4mm, hysteroscopes, cystoscopes, arthroscopes, nasal endoscopes, laryngeal endoscopes, ear endoscopes, intervertebral foramina endoscopes and other rigid endoscopes. The endoscope of the present invention can also be used in the industrial field.

[0105] The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention.

Claims

1. An endoscope system, comprising an objective lens module, a relay module, an eyepiece module, an optical interface optical path module and a digital ultra-high-definition camera arranged in sequence along an optical path, characterized in that: The image formed by the objective lens module is projected to the optical interface light path module in the form of non-parallel light and divergent light after passing through the relay module and the eyepiece module; the exit pupil of the eyepiece module is the entrance pupil of the optical interface light path module.

2. The endoscope system according to claim 1, characterized in that: The endoscope system is a hard endoscope.

3. The endoscope system according to claim 1, characterized in that: The non-parallel and divergent light forms a high-definition image on the digital ultra-high-definition camera after passing through the optical interface light path module.

4. The endoscope system according to claim 3, characterized in that: The imaging quality of the image formed on the digital ultra-high definition camera is better than the imaging quality of the image output by the optical interface light path module.

5. The endoscope system according to claim 3, characterized in that: The imaging quality of the image formed on the digital ultra-high-definition camera is better than the imaging quality of the image formed on the visual surface of the eyepiece module.

6. The endoscope system according to any one of claims 1 to 5, characterized in that: The relative aperture W of the system is D / f', where W is the relative aperture; D is the entrance pupil diameter of the entire system, that is, the entrance pupil diameter of the visual system; f' is the combined focal length of the system, f'=(f'o·f'C) / f'e, where f'o is the focal length of the objective lens module, f'C is the focal length of the optical interface light path module, and f'e is the focal length of the eyepiece module.

7. The endoscope system according to claim 6, characterized in that: The relative aperture of the system is 1:4-1:

6.

8. The endoscope system according to any one of claims 1 to 5, characterized in that: The entrance pupil diameter of the objective lens module for products of different specifications is 0.2 mm to 1 mm.

9. The endoscope system according to any one of claims 1 to 5, characterized in that: The exit pupil diameter of the eyepiece module is 3mm-6mm.

10. The endoscope system according to any one of claims 1 to 5, characterized in that: The entrance pupil diameter of the objective lens module is 0.2 mm to 1 mm, and the exit pupil diameter of the eyepiece module is 3 mm to 6 mm.

11. The endoscope system according to any one of claims 1 to 5, characterized in that: The system is used for spherical or aspherical endoscopes.

12. The endoscope system according to any one of claims 1 to 5, characterized in that: The system is used for endoscopes with an external diameter of 1.9 mm, 2.7 mm, 4 mm, 5 mm, 6 mm, 8 mm, and 10 mm.

13. The endoscope system according to any one of claims 1 to 5, characterized in that: The viewing angle of the system may be 0°, 30°, 45° or greater than 70°.

14. The endoscope system according to any one of claims 1 to 5, characterized in that: In the system, the length from the objective lens module to the eyepiece lens module can be any length.

15. An integrated design method for an endoscope camera optical system, the system comprising an objective lens module, a relay module, an eyepiece module, an optical interface optical path module and a digital ultra-high-definition camera arranged in sequence along the optical path direction, characterized in that: The system is an endoscope system as described in any one of claims 1 to 14, and the design method comprises: increasing the relative aperture of the optical interface optical path module by increasing the exit pupil diameter of the eyepiece module to 3 mm to 6 mm, thereby improving the resolution of the image imaged on the digital ultra-high-definition camera; wherein the exit pupil of the eyepiece module is the entrance pupil of the optical interface optical path module.

16. The design method according to claim 15, characterized in that: The resolution of the image formed on the digital ultra-high definition camera is improved by increasing the entrance pupil diameter of the objective lens module.

17. The design method according to claim 15, characterized in that: The entrance pupil diameter of the objective lens module is increased to 0.2 mm to 1 mm.

18. The design method according to claim 15, characterized in that: The relative aperture W of the system is D / f', where W is the relative aperture; D is the entrance pupil diameter of the entire system, that is, the entrance pupil diameter of the visual system; f' is the combined focal length of the system, f'=(f'o·f'C) / f'e, where f'o is the focal length of the objective lens module, f'C is the focal length of the optical interface light path module, and f'e is the focal length of the eyepiece module.

19. The design method according to claim 18, characterized in that: The relative aperture of the system is 1:4-1:

6.

20. The design method according to any one of claims 15 to 19, characterized in that: The design method is used for a rigid endoscope.

21. The design method according to any one of claims 15 to 19, characterized in that: The design method is applicable to spherical or aspherical endoscopes.

22. The design method according to any one of claims 15 to 19, characterized in that: The system is used for endoscopes with an external diameter of 1.9 mm, 2.7 mm, 4 mm, 5 mm, 6 mm, 8 mm, and 10 mm.

23. The design method according to any one of claims 15 to 19, characterized in that: The viewing angle of the system may be 0°, 30°, 45° or greater than 70°.

24. The design method according to any one of claims 15 to 19, characterized in that: In the system, the length from the objective lens module to the eyepiece lens module can be any length.

25. An endoscope used in the endoscope system according to any one of claims 1 to 14, comprising the objective lens module, the relay module and the eyepiece module.

26. An endoscope for use in the endoscope system according to any one of claims 1 to 14, comprising the objective lens module, the relay module, the eyepiece module and the optical interface light path module.

27. An optical adapter interface for the endoscope system according to any one of claims 1 to 14, comprising the optical interface light path module.

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