Endoscope

Abstract

An endoscope (100), which belongs to the technical field of imaging devices. The endoscope comprises: an imaging device (10) for transmitting an image; a first image sensor (20) arranged on an image side of the imaging device (10), the first image sensor (20) being used for receiving light transmitted by the imaging device (10) and collecting the image; and a magnifying device (30), which comprises a photoelectric conversion device (31), an image display (32), a second image sensor (34), and a magnifying lens group (33), wherein the photoelectric conversion device (31) is used for converting the image collected by the first image sensor (20) into an electrical signal and transmitting same to the image display (32), the image display (32) is used for displaying the image, the image display (32) is arranged on an object side of the magnifying lens group (33), the second image sensor (34) is arranged on an image side of the magnifying lens group (33), and the magnifying lens group (33) is used for magnifying the image displayed by the image display (32) and projecting the magnified image onto the second image sensor (34). Therefore, the technical problem of image clarity degradation caused by using a software interpolation algorithm processing means to increase the pixel count of an acquired image can be solved.

Description

An endoscope Technical Field

[0001] This application relates to the field of imaging device technology, specifically to an endoscope. Background Technology

[0002] Endoscopes are widely used in medical analysis, industrial inspection, precision design, and energy exploration. Endoscopes acquire images within a specific space, then magnify them before displaying them on a terminal display device. Currently, this is mainly achieved by using software interpolation algorithms to enlarge the image pixels, but this method leads to a decrease in image clarity. Technical issues

[0003] The purpose of this application is to provide an endoscope that solves the technical problem in the prior art where the use of software interpolation algorithms to enlarge the pixels of the image acquired by the endoscope leads to a decrease in image clarity. Technical solutions

[0004] To achieve the above objectives, embodiments of this application provide an endoscope, comprising: an imaging device for transmitting images; a first image sensor disposed on the image side of the imaging device, the first image sensor being used to receive light transmitted by the imaging device and acquire images; and a magnification device, the magnification device including a photoelectric conversion device, an image display, a second image sensor, and a magnifying lens group; the photoelectric conversion device being electrically connected to the first image sensor and the image display, the photoelectric conversion device being used to convert the image acquired by the first image sensor into an electrical signal and transmit it to the image display, the image display being used to receive the electrical signal transmitted by the photoelectric conversion device and display the image; the image display being disposed on the object side of the magnifying lens group, the second image sensor being disposed on the image side of the magnifying lens group, the magnifying lens group being used to magnify the image displayed on the image display and project the magnified image onto the second image sensor.

[0005] In some embodiments, the magnifying lens group includes a bi-telecentric lens.

[0006] In some embodiments, the magnifying lens group includes a first concave-convex lens, a first cemented doublet lens, a first aperture stop, a second cemented doublet lens, a third cemented doublet lens, a second concave-convex lens, a third concave-convex lens, a fourth concave-convex lens, and a fifth concave-convex lens arranged sequentially from the image display to the second image sensor; the first concave-convex lens is used to converge the light transmitted from the image display and transmit the light to the first cemented doublet lens; the first cemented doublet lens is used to converge the light transmitted from the first concave-convex lens and transmit the light to the second cemented doublet lens; the second cemented doublet lens is used to converge the light transmitted from the first cemented doublet lens and transmit the light to the second image sensor. The third cemented doublet lens is used to converge the light transmitted from the second cemented doublet lens and transmit the light to the second concave-convex lens. The second concave-convex lens is used to diverge the light transmitted from the third cemented doublet lens and transmit the light to the third concave-convex lens. The third concave-convex lens is used to diverge the light transmitted from the second concave-convex lens and transmit the light to the fourth concave-convex lens. The fourth concave-convex lens is used to converge the light transmitted from the third concave-convex lens and transmit the light to the fifth concave-convex lens. The fifth concave-convex lens is used to converge the light transmitted from the fourth concave-convex lens and form parallel light. The second image sensor is used to receive the parallel light emitted from the fifth concave-convex lens.

[0007] In some embodiments, the imaging apparatus includes a disposable image transmission light guide device and an imaging lens group. The disposable image transmission light guide device includes a front-end image capturing device and a light guide. The front-end image capturing device is disposed on the image capturing side of the light guide. The light guide is disposed between the front-end image capturing device and the imaging lens group. A first image sensor is disposed on the image side of the imaging lens group. The front-end image capturing device is used to receive light reflected from the object to be observed and transmit the light to the light guide. The light guide is used to receive the light transmitted by the front-end image capturing device and transmit the light to the imaging lens group. The imaging lens group is used to receive the light transmitted by the light guide and transmit the light to the first image sensor.

[0008] In some embodiments, the front-end imaging device includes a first light-inlet surface, a first reflective surface, and a first light-outlet surface; the first light-inlet surface and the first reflective surface are arranged along a first direction, which is perpendicular to the optical axis of the light guide; the first light-inlet surface is used to transmit light reflected by the object to be observed; the first reflective surface is arranged at an angle to the first light-inlet surface and the first light-outlet surface; the first reflective surface is used to reflect the light transmitted by the first light-inlet surface and reflect the light to the light guide; the first light-outlet surface and the first reflective surface are arranged along the optical axis of the light guide; the first light-outlet surface is used to transmit light reflected by the first reflective surface; or, the front-end imaging device extends along the optical axis of the light guide, and the front-end imaging device has a second light-inlet surface and a second light-outlet surface, which are respectively disposed at both ends of the front-end imaging device along the optical axis of the light guide.

[0009] In some embodiments, the first light-incoming surface is an arc surface or a plane, the first reflective surface is an arc surface or a plane, and the first light-outcoming surface is an arc surface or a plane.

[0010] In some embodiments, an optical adhesive is provided between the front-end imaging device and the light guide, and the thickness of the optical adhesive ranges from 5um to 10um; or, the front-end imaging device and the light guide are an integral structure.

[0011] In some embodiments, the imaging lens group includes a first convex lens, a first concave lens, a second concave lens, and a second convex lens arranged sequentially from the object side to the image side along its optical axis; the first convex lens is used to converge the light transmitted by the light guide and transmit the light to the first concave lens, the first concave lens is used to diverge the light transmitted by the first convex lens and transmit the light to the second concave lens, the second concave lens is used to diverge the light transmitted by the first concave lens and transmit the light to the second convex lens, the second convex lens is used to converge the light transmitted by the second concave lens and form parallel light, and the first image sensor is used to receive the parallel light emitted from the second convex lens.

[0012] In some embodiments, the imaging lens group includes at least one aspherical surface; the refractive index of the first convex lens and the second convex lens ranges from 1.49 to 1.65; and the refractive index of the first concave lens and the second concave lens ranges from 1.55 to 1.95.

[0013] In some embodiments, the imaging lens group further includes a protective lens and an infrared filter, wherein the protective lens is disposed on the side of the first convex lens away from the first concave lens; and the infrared filter is disposed between the second convex lens and the first image sensor.

[0014] In some embodiments, the extending direction of the light guide is consistent with the arrangement direction of the light guide and the front-end imaging device. The light guide is used to transmit the main light ray with an angle α with its optical axis, where α is greater than or equal to -0.5° and less than or equal to 0.5°.

[0015] In some embodiments, the optical axis of the imaging lens group coincides with the optical axis of the light guide; or, the optical axis of the imaging lens group is set at an angle to the optical axis of the light guide, and a deflecting prism is provided between the imaging lens group and the light guide. The deflecting prism has a second reflecting surface, which is set at an angle to the optical axis of the light guide and the optical axis of the imaging lens group. The deflecting prism is used to reflect the light transmitted by the light guide toward the imaging lens group.

[0016] In some embodiments, the disposable image transmission light guide device includes an auxiliary light source, which is located on the side of the front-end image acquisition device close to the object to be observed, and is used to provide illumination.

[0017] In some embodiments, the endoscope includes an illumination assembly, which includes a main light source and a beam splitter; the main light source is located on one side of the beam splitter along the optical axis perpendicular to the light guide, and the main light source is used to emit light to the beam splitter; the beam splitter is located on the side of the imaging lens group and the light guide away from the front imaging device along the optical axis of the light guide, and the beam splitter is used to reflect the light emitted by the main light source to the light guide, and the beam splitter is also used to transmit the light from the light guide that is directed to the beam splitter.

[0018] In some embodiments, the disposable image transmission light guide device further includes a housing extending along the length of the light guide member, the light guide member and the front-end image acquisition device being disposed within the housing member, and the disposable image transmission light guide device being detachably connected to the imaging lens group; the light guide member and the housing member are connected by double injection molding; or, the light guide member and the housing member are interference-fitted.

[0019] In some embodiments, the endoscope includes two magnifying devices, namely a first magnifying device and a second magnifying device; the photoelectric conversion device in the first magnifying device is electrically connected to a first image sensor; and the photoelectric conversion device in the second magnifying device is electrically connected to a second image sensor in the first magnifying device.

[0020] In some embodiments, the endoscope includes at least three magnifying devices.

[0021] The beneficial effects of the endoscope provided in this application are as follows: after the imaging device magnifies the image, the photoelectric conversion device can transmit the image to the image display, enabling the magnifying lens group to further magnify the image. Compared with electronic magnification, focusing light through a lens to form a magnified image, and then optically magnifying the image by focusing light through the magnifying lens group, can better preserve the original information of the image and transmit it to subsequent applications, reduce image distortion, improve image clarity, and facilitate observation of the magnified image. The magnifying lens group and the imaging device can be connected via cable. The size of the magnifying lens group does not affect the operator's ability to hold and operate it, thus allowing the magnifying lens group to be set to a larger diameter, enabling high-resolution and high-magnification image display. Attached Figure Description

[0022] Figure 1 is a schematic diagram of an endoscope provided in some embodiments of this application;

[0023] Figure 2 is a schematic diagram of an imaging device provided in some embodiments of this application;

[0024] Figure 3 is a schematic diagram of the internal structure of the imaging device in Figure 2;

[0025] Figure 4 is a schematic diagram of an imaging device provided in some embodiments of this application;

[0026] Figure 5 is a schematic diagram of a front-end imaging device and some light guide components provided in some embodiments of this application;

[0027] Figure 6 is a schematic diagram of a front-end imaging device and some light guide components provided in some embodiments of this application;

[0028] Figure 7 shows the parameter values ​​of each lens in the imaging device provided in some embodiments of this application;

[0029] Figure 8 shows the higher-order coefficients of the image-side surface of the second convex lens provided in some embodiments of this application;

[0030] Figure 9 is a schematic diagram of the imaging optical path of the imaging device in Figure 4;

[0031] Figure 10 is a schematic diagram of an imaging device provided in some embodiments of this application;

[0032] Figure 11 is a schematic diagram of the illumination optical path of the imaging device in Figure 10;

[0033] Figure 12 is a schematic diagram of an imaging device provided in some embodiments of this application;

[0034] Figure 13 is a schematic diagram of the imaging optical path of the imaging device in Figure 12;

[0035] Figure 14 is a schematic diagram of an imaging device provided in some embodiments of this application;

[0036] Figure 15 is a schematic diagram of an amplification device provided in some embodiments of this application;

[0037] Figure 16 shows the parameter values ​​of each lens in the magnifying lens group provided in some embodiments of this application;

[0038] Figure 17 is a schematic diagram of the imaging optical path of the magnification device in Figure 15;

[0039] Figure 18 is a schematic diagram of an endoscope provided in some embodiments of this application.

[0040] The following are the labeling elements in the figure:

[0041] 100. Endoscope;

[0042] 10. Imaging device; 11. Disposable image transmission light guide device; 111. Front-end image acquisition device; 1111. First light-inlet surface; 1112. First reflective surface; 1113. First light-outlet surface; 1114. Second light-inlet surface; 1115. Second light-outlet surface; 1116. First deflecting optical axis; 1117. Second deflecting optical axis; 112. Auxiliary light source; 113. Light guide component; 114. Housing component; 12. Imaging lens group; 121. Protective lens; 122. First convex lens; 123. First concave lens; 124. Second concave lens; 125. Second convex lens; 126. Infrared filter; 127. Filter; 13. Second aperture; 14. Deflecting prism; 141. Second reflective surface; 15. Handle;

[0043] 20. First image sensor;

[0044] 30. Magnifying device; 31. Photoelectric conversion device; 32. Image display; 33. Magnifying lens group; 331. First concave-convex lens; 332. First cemented doublet lens; 333. First aperture; 334. Second cemented doublet lens; 335. Third cemented doublet lens; 336. Second concave-convex lens; 337. Third concave-convex lens; 338. Fourth concave-convex lens; 339. Fifth concave-convex lens; 34. Second image sensor; 35. First magnifying device; 36. Second magnifying device;

[0045] 40. Illumination components; 41. Main light source; 42. Beam splitter; 43. Collimating lens;

[0046] 50. Object to be observed. Embodiments of the present invention

[0047] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0048] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0049] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0051] This application provides an endoscope for acquiring and magnifying images. It can be understood that the endoscope can be used in medical analysis to acquire images of the human body, or in other fields such as industrial inspection to acquire images of confined spaces.

[0052] Please refer to Figure 1. The endoscope 100 includes an imaging device 10, a first image sensor 20, and a magnifying device 30. The imaging device 10 is used to transmit images. The first image sensor 20 is located on the image side of the imaging device 10 and is used to receive the light transmitted by the imaging device 10 and acquire images. The magnifying device 30 includes a photoelectric conversion device 31, an image display 32, a second image sensor 34, and a magnifying lens group 33. The photoelectric conversion device 31 is electrically connected to the first image sensor 20 and the image display 32. The photoelectric conversion device 31 is used to convert the image acquired by the first image sensor 20 into an electrical signal and transmit it to the image display 32. The image display 32 is used to receive the electrical signal transmitted by the photoelectric conversion device 31 and display the image. The image display 32 is located on the object side of the magnifying lens group 33, and the second image sensor 34 is located on the image side of the magnifying lens group 33. The magnifying lens group 33 is used to magnify the image displayed on the image display 32 and project the magnified image onto the second image sensor 34.

[0053] Imaging device 10 is used to transmit light reflected from object 50 to imaging device 10, that is, imaging device 10 can acquire and transmit an image of object 50. For example, imaging device 10 may include a lens group that can magnify the image of object 50; for example, the optical path of imaging device 10 is a dual telecentric optical path.

[0054] The first image sensor 20 is disposed on the image side of the imaging device 10. The first image sensor 20 is used to receive light emitted from the imaging device 10 to the image side, that is, to receive the image transmitted by the imaging device 10. The first image sensor 20 is used to acquire image pixels.

[0055] Optionally, the size of the first image sensor 20 is greater than or equal to 1 / 31 inch and less than or equal to 1 / 9 inch. For example, the size of the first image sensor 20 is 1 / 18 inch, the number of pixels is 160K, the pixel size is 1.75um, and the sensing surface size is 714um×707um. The first image sensor 20 is set to a smaller size to fit the imaging device 10 with a smaller diameter, which makes it easier for the imaging device 10 to enter a confined space.

[0056] The photoelectric conversion device 31 can convert light signals into electrical signals. The input end of the photoelectric conversion device 31 is electrically connected to the first image sensor 20, and the photoelectric conversion device 31 can convert the image acquired by the first image sensor 20 into an electrical signal. The output end of the photoelectric conversion device 31 is electrically connected to the image display 32, and the photoelectric conversion device 31 can transmit the electrical signal carrying image information to the image display 32.

[0057] The photoelectric conversion device 31 can be connected to the first image sensor 20 and to the image display 32 via signal transmission cables. For example, the photoelectric conversion device 31 can be an embedded system, including a first controller corresponding to the first image sensor 20, capable of image data acquisition and image processing; for example, the photoelectric conversion device 31 may also include a second controller, capable of transmitting the image processed by the first controller to the image display 32.

[0058] The image display 32 can display an image of the object to be observed 50 according to the electrical signal transmitted by the photoelectric conversion device 31, and the image display 32 can emit the image in the form of light to the magnifying lens group 33.

[0059] For example, the image display 32 may include a DLP (Digital Light Processing) display panel, an LCOS (Liquid Crystal On Silicon) display panel, a MiniLED (Mini Light-Emitting Diode) display panel, or a MicroLED (Micro Light-Emitting Diode) display panel, etc., and the size of the image display 32 is greater than or equal to 0.1 inches and less than or equal to 1.0 inch. Optionally, the pixel size of the image display 32 may be greater than or equal to 1.5µm and less than or equal to 3.5µm, and the PPI (Pixels Per Inch) may be greater than or equal to 2000 and less than or equal to 20000.

[0060] The magnifying lens group 33 can receive the light emitted by the image display 32 and transmit the light to the image side of the magnifying lens group 33. That is, the magnifying lens group 33 can transmit the image displayed by the image display 32 to the second image sensor 34. The magnifying lens group 33 is a lens group that can magnify the image.

[0061] The second image sensor 34 is located on the image side of the magnifying lens group 33. The second image sensor 34 can receive the light emitted from the magnifying lens group 33, that is, receive the image magnified by the magnifying lens group 33. The second image sensor 34 is used to acquire image pixels.

[0062] For example, the second image sensor 34 has a resolution greater than 25 megapixels, specifically a pixel resolution of 11276 (horizontal) × 9200 (vertical). Optionally, the second image sensor 34 has a pixel size greater than or equal to 2µm and less than or equal to 10µm. The second image sensor 34 employs global shutter technology and uses either the CXP12 protocol (CoaXPress) or the GigE protocol (Gigabit Ethernet Vision), achieving a full-resolution acquisition speed exceeding 20fps (frames per second).

[0063] The working process of this embodiment is as follows: The imaging device 10 transmits the image of the object to be observed 50 to the first image sensor 20. The first image sensor 20 receives the light transmitted by the imaging device 10 to acquire the image of the object to be observed 50. The photoelectric conversion device 31 converts the image acquired by the first image sensor 20 into an electrical signal and transmits the electrical signal to the image display 32. The image display 32 receives the electrical signal transmitted by the photoelectric conversion device 31 to display the image transmitted by the photoelectric conversion device 31. The image display 32 emits the image in the form of light to the magnifying lens group 33. The magnifying lens group 33 receives the light emitted by the image display 32, magnifies the image displayed by the image display 32, and transmits it to the second image sensor 34. The second image sensor 34 acquires the image transmitted by the magnifying lens group 33 to the image side. After the final image acquired by the second image sensor 34 is transmitted to the external display screen, the image can be observed.

[0064] Endoscope 100 is generally used in confined spaces, so the imaging device 10 is relatively small. Due to the size limitation of the imaging device 10, the images transmitted by the imaging device 10 are usually difficult to magnify by many times, resulting in unclear images. It is necessary to magnify the images for observation. Currently, the most common image magnification method is electronic magnification. Electronic magnification uses software "interpolation" algorithms to enlarge the pixels of the image, which leads to a decrease in image clarity, blurry image display, and color distortion in color images.

[0065] Accordingly, the imaging device 10 of this embodiment can initially magnify the image, and the photoelectric conversion device 31 can transmit the image to the image display 32, enabling the magnifying lens group 33 to further magnify the image. Compared with electronic magnification, focusing light through a lens to form a magnified image, and then focusing light through the magnifying lens group 33 for optical magnification, can better preserve the original information of the image and transmit it to subsequent applications, reduce image distortion, improve image clarity, and facilitate observation of the magnified image. The magnifying lens group 33 can be connected to the imaging device 10 via a cable. The size of the magnifying lens group 33 does not affect the operator's ability to hold and operate it, thus allowing the magnifying lens group 33 to be set to a larger diameter, enabling high resolution and high magnification display of the image.

[0066] In some embodiments, the magnifying lens group 33 includes a double telecentric lens.

[0067] The object-side principal ray and image-side principal ray of a double telecentric lens are parallel or nearly parallel to the optical axis of the lens.

[0068] It is understandable that the magnifying lens group 33 can transmit light vertically to the second image sensor 34.

[0069] Traditional optical magnification methods mostly involve microscope magnification. When the object surface is large, the microscope magnification system needs to be designed with a small numerical aperture to ensure depth of field. However, a small numerical aperture will cause image blurring and distortion, resulting in imaging distortion.

[0070] Accordingly, the imaging lens group 12 of this application embodiment includes a dual telecentric lens, which can achieve smooth magnification of the image based on the low aberration and high resolution image received by the second image sensor 34.

[0071] In some embodiments, referring to Figures 15 to 17, the magnifying lens group 33 includes a first concave-convex lens 331, a first cemented doublet lens 332, a first aperture 333, a second cemented doublet lens 334, a third cemented doublet lens 335, a second concave-convex lens 336, a third concave-convex lens 337, a fourth concave-convex lens 338, and a fifth concave-convex lens 339, arranged sequentially from the image display 32 to the second image sensor 34. The first concave-convex lens 331 converges the light transmitted from the image display 32 and transmits the light to the first cemented doublet lens 332. The first cemented doublet lens 332 converges the light transmitted from the first concave-convex lens 331 and transmits the light to the second cemented doublet lens 334. The second cemented doublet lens 334 converges the light transmitted from the first cemented doublet lens 332 and transmits the light to the third cemented doublet lens 335. The third cemented doublet lens 335 converges the light transmitted from the second cemented doublet lens 334 and transmits the light to the second concave-convex lens 336. The second concave-convex lens 337... 36 is used to diverge the light transmitted by the third cemented doublet lens 335 and transmit the light to the third concave-convex lens 337. The third concave-convex lens 337 is used to diverge the light transmitted by the second concave-convex lens 336 and transmit the light to the fourth concave-convex lens 338. The fourth concave-convex lens 338 is used to converge the light transmitted by the third concave-convex lens 337 and transmit the light to the fifth concave-convex lens 339. The fifth concave-convex lens 339 is used to converge the light transmitted by the fourth concave-convex lens 338 and form parallel light. The second image sensor 34 is used to receive the parallel light emitted from the fifth concave-convex lens 339.

[0072] It can be understood that the fifth concave-convex lens 339 diverges the light rays transmitted by the fourth concave-convex lens 338 and forms parallel light rays that are approximately parallel to the optical axis of the magnifying lens group 33, with the angle between the parallel light rays and the optical axis of the magnifying lens group 33 being within a small range.

[0073] The first cemented doublet lens 332, the second cemented doublet lens 334, and the third cemented doublet lens 335 each include two adjacent lenses, and the radii of curvature of the adjacent surfaces of these two adjacent lenses are equal and the air gap is extremely small.

[0074] Optionally, when adjacent lenses have equal curvature of adjacent surfaces and extremely small air gaps, they can be cemented together to form a cemented lens, thereby eliminating red-blue aberration and off-axis aberration. For example, the second concave-convex lens 336 and the third concave-convex lens 337 can be provided individually or cemented together to form a cemented doublet. For example, the third concave-convex lens 337 and the fourth concave-convex lens 338 can be provided individually or cemented together to form a cemented doublet.

[0075] Optionally, the parameter values ​​for each lens in the magnifying lens group 33 are shown in Figure 16. It should be noted that in Figure 16, "surface" refers to the serial number of each surface arranged sequentially from the image side to the object side, and each cemented doublet lens includes three "surfaces". "Radius of curvature" is the spherical radius of each surface, expressed in millimeters. A positive "radius of curvature" indicates a surface convex to the image side, while a negative "radius of curvature" indicates a surface convex to the object side. "Infinite" refers to a planar surface. "Thickness" is the distance between this surface and its adjacent surface in the direction from the image side to the object side along the optical axis of the magnifying lens group 33, also expressed in millimeters. If this surface and its adjacent surface in the direction from the image side to the object side belong to the same lens, then it represents the thickness of that lens.

[0076] The image display 32 has a flat surface facing the image side with a net aperture of 6.411061 mm; the distance between the image display 32 and the first concave-convex lens 331 is 5.851267 mm. The object-facing side of the first concave-convex lens 331 is convex to the image side, with a radius of curvature of 39.93667 mm and a net aperture of 15.23021 mm; the image-facing side of the first concave-convex lens 331 is also convex to the image side, with a radius of curvature of 12.17377 mm and a net aperture of 18.78153 mm; the material of the first concave-convex lens 331 is H-ZLAF89L, and its thickness is 7.408964 mm; the distance between the first concave-convex lens 331 and the first cemented doublet lens 332 is 1.211929 mm.

[0077] For ease of description, the lens closer to the object side in the first cemented doublet lens 332 is defined as the first object-side lens, and the lens closer to the image side in the first cemented doublet lens 332 is defined as the first image-side lens. The object-side lens has a convex side facing the object side, a radius of curvature of 19.73364 mm, and a net aperture of 17.2167 mm; the image-side lens has a convex side facing the object side, a radius of curvature of 8.316012 mm, and a net aperture of 14.51238 mm; the object-side lens has a thickness of 2.5 mm and is made of H-ZF72A material. The first image-side lens has a convex side facing the object side, a radius of curvature of 8.316012 mm, and a net aperture of 14.51238 mm; the first image-side lens has a convex side facing the image side, a radius of curvature of 54.49134 mm, and a net aperture of 14.42094 mm; the first image-side lens has a thickness of 5.177395 mm, is made of H-LAF1, and the distance between the first image-side lens and the first aperture is 6.155678 mm.

[0078] The first aperture 333 is planar with a net aperture of 9.663797 mm, and the distance between the first aperture 333 and the second cemented doublet lens 334 is 1.198197 mm.

[0079] For ease of description, the lens closer to the object side in the second cemented doublet 334 is defined as the second object-side lens, and the lens closer to the image side in the second cemented doublet 334 is defined as the second image-side lens. The object-side lens has a convex side facing the object side, a radius of curvature of 11.63053 mm, and a net aperture of 12.08273 mm; the image-side lens has a convex side facing the object side, a radius of curvature of 44.97196 mm, and a net aperture of 10.9368 mm; the object-side lens has a thickness of 3.302482 mm and is made of H-ZLAF68N material. The object-side lens is capable of converging light. The second image-side lens has a convex side facing the object side, a radius of curvature of 44.97196 mm, and a net aperture of 10.9368 mm; the second image-side lens has a convex side facing the image side, a radius of curvature of 7.649842 mm, and a net aperture of 8.703032 mm; the second image-side lens has a thickness of 2.594789 mm and is made of H-LAF4GT. The second image-side lens can diverge light, and the distance between the second image-side lens and the third cemented doublet lens 335 is 2.364475 mm.

[0080] For ease of description, the lens closer to the object side in the third cemented doublet 335 is defined as the third object-side lens, and the lens closer to the image side in the third cemented doublet 335 is defined as the third image-side lens. The object-side lens has a convex side facing the object side, a radius of curvature of -35.54751 mm, and a net aperture of 8.569654 mm; the image-side lens has a convex side facing the image side, a radius of curvature of 7.364 mm, and a net aperture of 8.420074 mm; the object-side lens has a thickness of 2.5 mm and is made of H-ZF4AGT material. The third image-side lens has a convex side facing the object side, a radius of curvature of 7.364 mm, and a net aperture of 8.420074 mm; the third image-side lens has a convex side facing the object side, a radius of curvature of 30.204 mm, and a net aperture of 8.214935 mm; the thickness of the third image-side lens is 5.451352 mm, the material is H-ZLAF68C, and the distance between the third image-side lens and the second concave-convex lens 336 is 4.97519 mm.

[0081] The second concave-convex lens 336 has an object-side surface that convexes towards the image side, a radius of curvature of 7.523588 mm, and a net aperture of 8.828666 mm; the image-side surface of the second concave-convex lens 336 has an image-side surface that convexes towards the image side, a radius of curvature of 304.3156 mm, and a net aperture of 13.43391 mm; the material of the second concave-convex lens 336 is H-ZLAF71AGT, and the thickness is 5.000305 mm; the distance between the second concave-convex lens 336 and the third concave-convex lens 337 is 4.894181 mm.

[0082] The third concave-convex lens 337 has an object-facing side that convexes towards the image side, a radius of curvature of 12.44502 mm, and a net aperture of 16.34701 mm; the image-facing side of the third concave-convex lens 337 has an image-facing side that convexes towards the image side, a radius of curvature of 16.89214 mm, and a net aperture of 23.19652 mm; the material of the third concave-convex lens 337 is H-ZLAF50D, and the thickness is 5.779923 mm; the distance between the third concave-convex lens 337 and the fourth concave-convex lens 338 is 5.630167 mm.

[0083] The fourth concave-convex lens 338 has an object-side surface that convexes towards the image side, a radius of curvature of 34.41025 mm, and a net aperture of 32.12845 mm; the image-side surface of the fourth concave-convex lens 338 has an image-side surface that convexes towards the image side, a radius of curvature of 25.71929 mm, and a net aperture of 35.83135 mm; the fourth concave-convex lens 338 is made of H-ZLAF78B material and has a thickness of 6.264287 mm; the distance between the fourth concave-convex lens 338 and the fifth concave-convex lens 339 is 1.200683 mm.

[0084] The fifth concave-convex lens 339 has an object-side surface that convexes towards the image side, a radius of curvature of 103.0595 mm, and a net aperture of 40.62526 mm; the image-side surface of the fifth concave-convex lens 339 has an image-side surface that convexes towards the image side, a radius of curvature of 38.31446 mm, and a net aperture of 42.44939 mm; the fifth concave-convex lens 339 is made of H-ZLAF68B material and has a thickness of 7.540739 mm; the distance between the fifth concave-convex lens 339 and the second image sensor 34 is 32.99896 mm.

[0085] The side of the second image sensor 34 facing the object is a plane, and the net aperture of the second image sensor 34 is 6.411061 mm.

[0086] The beneficial effects of this application embodiment are as follows: the magnifying lens group 33 adopts the above-mentioned lens combination, and the main rays of the object-side field of view near the image display 32 are all perpendicular or nearly perpendicular to the image display 32, so that the angle between the main rays of the object-side field of view and the optical axis of the magnifying lens group 33 is less than or equal to 1°; the main rays of the image-side field of view near the second image sensor 34 are also all perpendicular or nearly perpendicular to the second image sensor 34, so that the angle between the main rays of the image-side field of view and the optical axis of the magnifying lens group 33 is less than or equal to 1°, so that the magnifying lens group 33 can form a dual telecentric optical path, which can smoothly magnify the image.

[0087] In some embodiments, referring to FIG2, the imaging device 10 includes a disposable image transmission light guide device 11 and an imaging lens group 12. The disposable image transmission light guide device 11 includes a front-end image capturing device 111 and a light guide 113. The front-end image capturing device 111 is disposed on the image capturing side of the light guide 113. The light guide 113 is disposed between the front-end image capturing device 111 and the imaging lens group 12. The first image sensor 20 is disposed on the image side of the imaging lens group 12.

[0088] The front-end image capturing device 111 is used to receive the light reflected by the object to be observed 50 and transmit the light to the light guide 113; the light guide 113 is used to receive the light transmitted by the front-end image capturing device 111 and transmit the light to the imaging lens group 12, and the imaging lens group 12 is used to receive the light transmitted by the light guide 113 and transmit the light to the first image sensor 20.

[0089] The front-end image-capturing device 111 is used to receive the light reflected from the object 50 and transmit the image of the object 50. Optionally, the front-end image-capturing device 111 includes a prism, a lens, or a lens group, etc.

[0090] The light guide 113 is disposed on the light-emitting side of the front-end image capturing device 111 to receive the image transmitted by the front-end image capturing device 111 and transmit the image to the imaging lens group 12. Optionally, the light guide 113 may include a rod lens or a rotating lens group, etc.

[0091] The imaging lens group 12 can magnify the image transmitted by the light guide 113 and transmit the image to the first image sensor 20; the imaging lens group 12 can also transmit images one-to-one. Optionally, the imaging lens group 12 can be installed in the handle 15 of the endoscope 100.

[0092] Optionally, all components in the disposable image transmission light guide device 11 are disposable and replaceable. Each time the endoscope 100 is used, a new disposable image transmission light guide device 11 can be connected to the imaging lens group 12; that is, the disposable image transmission light guide device 11 and the imaging lens group 12 can be connected in a detachable manner, such as through bolts, clips, or other detachable structures. After each use of the endoscope 100, the disposable image transmission light guide device 11 can be discarded.

[0093] The beneficial effects of this embodiment are as follows: the image of the object to be observed 50 can be transmitted from a confined space to the imaging lens group 12 through the image acquisition device and the light guide 113; the imaging lens group 12 is set to facilitate alignment with the first image sensor 20 and matching with the first image sensor 20, so that the first image sensor 20 can stably acquire images. The disposable image transmission light guide device 11 is used as a disposable device, which can eliminate the need for subsequent cleaning steps, reduce the contamination of the disposable image transmission light guide device 11, and facilitate its use in human body detection.

[0094] In some embodiments, referring to FIG5, the front-end imaging device 111 includes a first light-incoming surface 1111, a first reflective surface 1112, and a first light-outgoing surface 1113; the first light-incoming surface 1111 and the first reflective surface 1112 are arranged along a first direction X, the first direction X being perpendicular to the optical axis of the light guide 113, and the first light-incoming surface 1111 is used to transmit light reflected by the object to be observed 50; the first reflective surface 1112 is arranged at an angle to the first light-incoming surface 1111 and the first light-outgoing surface 1113, and the first reflective surface 1112 is used to reflect the light transmitted by the first light-incoming surface 1111 and reflect the light to the light guide 113; the first light-outgoing surface 1113 and the first reflective surface 1112 are arranged along the optical axis of the light guide 113, and the first light-outgoing surface 1113 is used to transmit the light reflected by the first reflective surface 1112.

[0095] It is understood that the front-end imaging device 111 may include one optical element or multiple optical elements. The first light-incoming surface 1111, the first reflective surface 1112, and the first light-exiting surface 1113 may be disposed on one optical element or multiple optical elements. Optionally, the front-end imaging device 111 may include a prism, and the first light-incoming surface 1111, the first reflective surface 1112, and the first light-exiting surface 1113 may be disposed on one prism; the front-end imaging device 111 may also include two lenses and a reflector, and the first light-incoming surface 1111 and the first light-exiting surface 1113 may be disposed on the two lenses respectively, and the first reflective surface 1112 may be disposed on the reflector.

[0096] The first light-gathering surface 1111 and the first reflective surface 1112 are arranged along the first direction X, that is, the first turning optical axis 1116, which passes through the center of the first light-gathering surface 1111 and the first reflective surface 1112, extends along the first direction X. The first light-gathering surface 1111 is capable of receiving the image of the object to be observed 50 located on the side of the first light-gathering surface 1111 away from the first reflective surface 1112 along the first direction X.

[0097] The normal direction passing through the center of the first reflecting surface 1112 forms an angle with the normal direction passing through the center of the first light-incoming surface 1111; the normal direction passing through the center of the first reflecting surface 1112 forms an angle with the normal direction passing through the center of the first light-emitting surface 1113, so that the first reflecting surface 1112 can reflect light rays parallel or nearly parallel to the first turning optical axis 1116 into light rays parallel or nearly parallel to the axis of the light guide 113. Optionally, the angle between the normal direction passing through the center of the first reflecting surface 1112 and the normal direction passing through the center of the first light-incoming surface 1111 is 45°, and the angle between the normal direction passing through the center of the first reflecting surface 1112 and the normal direction passing through the center of the first light-emitting surface 1113 is 45°.

[0098] The first light-emitting surface 1113 and the first reflective surface 1112 are arranged along the optical axis of the light guide 113, that is, the second turning optical axis 1117, which passes through the center of the first light-emitting surface 1113 and the first reflective surface 1112, extends along the optical axis of the light guide 113. The first light-emitting surface 1113 is disposed between the first reflective surface 1112 and the light guide 113 to transmit the light reflected by the first reflective surface 1112 to the light guide 113.

[0099] Optionally, on the side of the first light-entry surface 1111 close to the object 50, the principal ray of each field of view of the object is almost parallel to the first turning optical axis 1116, and the angle between the principal ray of the object field of view and the first turning optical axis 1116 is greater than or equal to -0.2° and less than or equal to 0.2°.

[0100] The beneficial effects of this application embodiment are as follows: the first light-incoming surface 1111 is set on one side of the optical axis of the light guide 113 along the first direction X, which facilitates the acquisition of the image of the object to be observed 50 located on one side of the front imaging device 111 along the first direction X, and facilitates the detection of the inner wall of the tubular organoid; the first reflective surface 1112 is set to reflect the light transmitted by the first light-incoming surface 1111 to the light guide 113, which can transmit the image of the object to be observed 50 to the imaging lens group 12.

[0101] In some embodiments, referring to Figures 12 and 13, the front imaging device 111 extends along the optical axis of the light guide 113. The front imaging device 111 has a second light-inlet surface 1114 and a second light-outlet surface 1115, which are respectively disposed at both ends of the front imaging device 111 along the optical axis of the light guide 113.

[0102] Optionally, the front-end image-capturing device 111 may include a cylindrical lens, etc.

[0103] The second light-emitting surface 1115 is disposed between the second light-incoming surface 1114 and the light guide 113. Both the second light-incoming surface 1114 and the second light-emitting surface 1115 are used to transmit light reflected from the object 50 to be observed. The normal directions of the second light-incoming surface 1114 and the second light-emitting surface 1115 are consistent with the axial direction of the light guide 113. Optionally, the second light-incoming surface 1114 and the second light-emitting surface 1115 can be arc surfaces, so that the front-end imaging device 111 has the function of transmitting and refracting light.

[0104] Optionally, when using the endoscope 100, the distance between the second light-gathering surface 1114 and the object to be observed 50 is controlled to be greater than or equal to 4 mm and less than or equal to 30 mm.

[0105] Optionally, on the side of the second light-gathering surface 1114 closest to the object 50, the principal rays of each field of view of the object are almost parallel to the optical axis of the front imaging device 111, and the angle between the principal rays of the object field of view and the optical axis of the front imaging device 111 is greater than or equal to -0.2° and less than or equal to 0.2°.

[0106] The beneficial effects of this application embodiment are: the second light-entry surface 1114 and the second light-exit surface 1115 are arranged along the optical axis direction of the light guide 113, which facilitates the acquisition of images of the object to be observed 50 located on one side of the front imaging device 111 along the optical axis direction of the light guide 113, and facilitates the detection of non-tubular organs.

[0107] In some embodiments, please refer to Figures 5 and 6, the first light-incoming surface 1111 is an arc surface or a plane, the first reflective surface 1112 is an arc surface or a plane, and the first light-emitting surface 1113 is an arc surface or a plane.

[0108] When the first light-inlet surface 1111 and the first light-outlet surface 1113 are planar, they can transmit light; when the first reflective surface 1112 is planar, it can reflect parallel light to the same angle.

[0109] When the first light-incoming surface 1111 is an arc surface, it can transmit and refract light. When the first light-incoming surface 1111 protrudes towards the first reflecting surface 1112, the first light-incoming surface 1111 can cause the light reflected by the object to be observed 50 to diverge in a direction away from the first turning optical axis 1116. When the first light-incoming surface 1111 protrudes towards the first reflecting surface 1112, the first light-incoming surface 1111 can cause the light reflected by the object to be observed 50 to converge in a direction close to the first turning optical axis 1116.

[0110] When the first reflecting surface 1112 is an arc surface, it can reflect parallel light to different angles. When the first reflecting surface 1112 protrudes inward toward the front imaging device 111, it can cause the reflected light to diverge away from the second turning optical axis 1117. When the first reflecting surface 1112 protrudes outward toward the front imaging device 111, it can cause the reflected light to converge toward the second turning optical axis 1117. Optionally, the first reflecting surface 1112 is a plane, and the angle between the normal of the first reflecting surface 1112 and the optical axis of the light guide 113 is 45°.

[0111] When the first light-emitting surface 1113 is an arc surface, it can transmit and refract light. When the first light-emitting surface 1113 protrudes towards the first reflecting surface 1112, the first light-emitting surface 1113 can cause the light reflected by the first reflecting surface 1112 to diverge in a direction away from the second turning optical axis 1117. When the first light-emitting surface 1113 protrudes away from the first reflecting surface 1112, the first light-emitting surface 1113 can cause the light reflected by the first reflecting surface 1112 to converge in a direction closer to the second turning optical axis 1117.

[0112] Based on the convergence or divergence of the light beam reflected from the object to be observed 50 to the first light-incoming surface 1111, the first light-reflecting surface 1112 and the first light-exiting surface 1113 are set to different shapes so that the light beams are converged or diverged to form light beams that tend to be consistent with the optical axis direction of the light guide 113.

[0113] For example, please refer to Figure 6. When the light reflected from the object to be observed 50 towards the first light-incoming surface 1111 gradually diverges, the first light-incoming surface 1111 is configured as an arc surface convex away from the first reflecting surface 1112, the first reflecting surface 1112 is configured as an arc surface convex outward from the front imaging device 111, and the first light-exiting surface 1113 is configured as an arc surface convex towards the first reflecting surface 1112. The light reflected from the object to be observed 50 converges towards the first turning optical axis 1116 after passing through the first light-incoming surface 1111, and then converges again towards the second turning optical axis 1117 after being reflected by the first reflecting surface 1112. The light then passes through the first light-exiting surface 1113 and diverges away from the second turning optical axis 1117. The light rays tend to be aligned with the optical axis direction of the light guide 113 within the light guide 113.

[0114] For example, when the light reflected from the object to be observed 50 towards the first light-incoming surface 1111 gradually converges, the first light-incoming surface 1111 is configured as an arc surface convex towards the first reflecting surface 1112, the first reflecting surface 1112 is configured as an arc surface convex towards the front imaging device 111, and the first light-exiting surface 1113 is configured as an arc surface convex away from the first reflecting surface 1112. The light reflected from the object to be observed 50 diverges away from the first turning optical axis 1116 after passing through the first light-incoming surface 1111. Then, the light refracted by the first light-incoming surface 1111 is reflected by the first reflecting surface 1112 and diverges away from the second turning optical axis 1117. The light reflected by the first reflecting surface 1112 then passes through the first light-exiting surface 1113 and diverges away from the second turning optical axis 1117. The light refracted by the first light-exiting surface 1113 tends to be aligned with the optical axis direction of the light guide 113 within the light guide 113.

[0115] The beneficial effects of this application embodiment are as follows: setting the first light-incoming surface 1111, the first reflective surface 1112, and the first light-exiting surface 1113 as a plane facilitates the direct reflection of the parallel light beam reflected by the object to be observed 50 into a light beam that is nearly parallel to the axis of the light guide 113; setting the first light-incoming surface 1111, the first reflective surface 1112, and the first light-exiting surface 1113 as an arc surface can converge the diverging light beam reflected by the object to be observed 50, or diverge the converged light beam reflected by the object to be observed 50, can adjust a specific light beam to be nearly parallel to the axial direction of the light guide 113, can increase the amount of light transmitted from the light guide 113 to the imaging lens group 12, and can increase the field of view and increase the telecentricity of the optical path.

[0116] In some embodiments, an optical adhesive is provided between the front-end imaging device 111 and the light guide 113, and the thickness of the optical adhesive ranges from 5µm to 10µm.

[0117] It is understood that the front-end image capturing device 111 and the light guide 113 are spaced apart, and optical adhesive is used to fill the space between them. The thickness of the optical adhesive is equal to the distance between the front-end image capturing device 111 and the light guide 113. The front-end image capturing device 111 and the light guide 113 are connected by optical adhesive. Optionally, optical adhesive is used to fill the space between the first light emitting surface 1113 and the light guide 113, or between the second light emitting surface 1115 and the light guide 113. Optionally, the thickness of the optical adhesive can be 5µm, 8µm, or 10µm.

[0118] The beneficial effects of this application embodiment are: using optical adhesive to facilitate the connection between the front-end image capturing device 111 and the light guide 113, and the optical adhesive being able to transmit light, which facilitates the transmission of light between the front-end image capturing device 111 and the light guide 113.

[0119] In some embodiments, the front-end image capturing device 111 and the light guide 113 are an integral structure.

[0120] It is understood that there is no light-transmitting surface between the front-end imaging device 111 and the light guide 113, and the front-end imaging device 111 does not include the first light-emitting surface 1113.

[0121] Optionally, the front-end image capturing device 111 and the light guide 113 are integrally formed using processes such as injection molding.

[0122] The beneficial effects of this application embodiment are: the front-end image capturing device 111 and the light guide 113 are integrally formed, eliminating the need to connect the front-end image capturing device 111 and the light guide 113, making manufacturing more convenient.

[0123] In some embodiments, referring to Figures 4 and 9, the imaging lens group 12 includes a first convex lens 122, a first concave lens 123, a second concave lens 124, and a second convex lens 125 arranged sequentially from the object side to the image side along its optical axis. The first convex lens 122 is used to converge the light transmitted by the light guide 113 and transmit the light to the first concave lens 123. The first concave lens 123 is used to diverge the light transmitted by the first convex lens 122 and transmit the light to the second concave lens 124. The second concave lens 124 is used to diverge the light transmitted by the first concave lens 123 and transmit the light to the second convex lens 125. The second convex lens 125 is used to converge the light transmitted by the second concave lens 124 and form parallel light. The first image sensor 20 is used to receive the parallel light emitted from the second convex lens 125.

[0124] Optionally, the first convex lens 122 has its object-side side convex towards the object side, and the second convex lens 125 has its image-side side convex towards the image side.

[0125] It can be understood that the second convex lens 125 converges the light rays transmitted by the second concave lens 124 and forms parallel light rays that are approximately parallel to the optical axis of the imaging lens group 12, and the angle between the parallel light rays and the optical axis of the imaging lens group 12 is within a small range.

[0126] Optionally, the first convex lens 122, the first concave lens 123, the second concave lens 124, and the second convex lens 125 may include plastic lenses or glass lenses, etc.

[0127] The beneficial effects of this application embodiment are as follows: the imaging lens group 12 adopts the above-mentioned lens combination to make the imaging device 10 have an image-side telecentric optical path, so that the angle between the principal ray of each image-side field of view between the second convex lens 125 and the first image sensor 20 and the optical axis of the imaging lens group 12 is greater than or equal to -0.2° and less than or equal to 0.2°, so that the principal ray of the image-side field of view is almost parallel to the optical axis of the imaging lens group 12, which can smoothly magnify the image.

[0128] In some embodiments, the imaging lens group 12 includes at least one aspherical surface; the refractive index of the first convex lens 122 and the second convex lens 125 ranges from 1.49 to 1.65; and the refractive index of the first concave lens 123 and the second concave lens 124 ranges from 1.55 to 1.95.

[0129] Optionally, the image-facing side of the second convex lens 125 is an aspherical surface. For the higher-order coefficients of the aspherical surface, please refer to Figure 8: the coefficient of r^2 is 0, the coefficient of r^4 is 0.46615231, the coefficient of r^6 is 0, the coefficient of r^8 is 0, the coefficient of r^10 is 0, the coefficient of r^12 is 0, the coefficient of r^14 is 0, and the coefficient of r^16 is 0.

[0130] The beneficial effects of the embodiments of this application are as follows: the first convex lens 122 and the second convex lens 125 of the imaging lens group 12 adopt a lower refractive index, and the first concave lens 123 and the second concave lens 124 adopt a higher refractive index. The combination of high refractive index and low refractive index can eliminate red-blue difference and off-axis aberration.

[0131] In some embodiments, referring to Figures 3 and 4, the imaging lens group 12 further includes a protective lens 121 and an infrared filter 126. The protective lens 121 is disposed on the side of the first convex lens 122 away from the first concave lens 123; the infrared filter 126 is disposed between the second convex lens 125 and the first image sensor 20.

[0132] The protective lens 121 is used to protect the convex and concave lenses in the imaging lens group 12 from damage. Optionally, the protective lens 121 is connected to the handle 15 of the endoscope 100 to isolate the convex and concave lenses in the imaging lens group 12 from the outside.

[0133] Infrared filter 126 is used to filter infrared light incident from the second lens onto the first image sensor 20. Optionally, the angle between the principal ray of each image-side field of view of the infrared filter 126 and the first image sensor 20, and the optical axis of the imaging lens group 12, is greater than or equal to -0.2° and less than or equal to 0.2°.

[0134] The beneficial effects of this embodiment are as follows: the protective lens 121 can separate the convex and concave lenses in the imaging lens group 12 from the disposable image transmission light guide device 11, thus protecting the convex and concave lenses in the imaging lens group 12 from damage during the disassembly and assembly of the disposable image transmission light guide device 11. The infrared filter 126 can filter infrared rays, reducing the influence of infrared rays on the image.

[0135] In some embodiments, referring to Figures 2 to 4, the imaging device 10 further includes a second aperture 13 disposed between the imaging lens group 12 and the light guide 113. The imaging lens group 12 also includes a filter 127 disposed between the protective lens 121 and the first convex lens 122, the filter 127 being capable of controlling the amount of light and adjusting the color.

[0136] Optionally, filter 127 includes ultraviolet filter 127, which can reduce the impact of ultraviolet rays in the atmosphere on the image.

[0137] Optionally, the parameter values ​​for each lens in the imaging device 10 are shown in Figure 7. It should be noted that in Figure 7, "surface" refers to the serial number of each surface arranged sequentially from the object side to the image side. Serial number 2 is the first light-entry surface 1111, serial number 4 is the first reflective surface 1112, and serial number 6 is the first light-exit surface 1113. "Surfaces" 3 and 5 are coordinate breakpoints, indicating that the first reflective surface 1112 has been angled. "Radius of curvature" is the spherical radius of each surface, measured in millimeters. From serial number 1 to serial number 4, a surface convex to the object side has a positive "radius of curvature," and a surface convex to the image side has a negative "radius of curvature." From serial number 5 to the image surface, a surface convex to the object side has a negative "radius of curvature," and a surface convex to the image side has a positive "radius of curvature." "Infinite" indicates that the surface is planar. "Thickness" refers to the distance between the surface and its adjacent surface in the direction from the image side to the object side along the optical axis of the imaging device 10. From number 1 to number 4, the thickness from the object side to the image side is positive, and the thickness from the image side to the object side is negative. From number 5 to the image plane, the thickness from the object side to the image side is negative, and the thickness from the image side to the object side is positive. The unit of "thickness" is millimeters. If the surface and its adjacent surface in the direction from the image side to the object side belong to the same lens, then it represents the thickness of that lens. "Glass" refers to the material of the device on which the corresponding surface is located. Among them, E48R, K26R, and EP5000 are plastic models. E48R plastic lenses have high optical transparency and precision molding capabilities; K26R plastic lenses have high transparency, high fluidity, low birefringence, low haze, and low hygroscopicity; EP5000 plastic lenses have excellent light transmission, heat resistance, mechanical strength, and chemical stability.

[0138] The side of the object to be observed 50 facing the front imaging device 111 is flat with a net aperture of 1.550435 mm; the distance between the object to be observed 50 and the first light-incoming surface 1111 of the front imaging device 111 is 4 mm. The first light-incoming surface 1111 convexes towards the image side (first reflecting surface 1112), has a radius of curvature of 12.44858 mm, a net aperture of 1.794939 mm, and a distance of 1.1 mm between the first light-incoming surface 1111 and the first reflecting surface 1112. The first reflecting surface 1112 is flat with a net aperture of 2.535719 mm, and a distance of 1.5 mm between the first reflecting surface 1112 and the first light-exiting surface 1113. The first light-exiting surface 1113 is flat with a net aperture of 1.766209 mm, and a distance of 0.02 mm between the first light-exiting surface 1113 and the light guide 113. The front-end imaging device 111 is made of E48R material.

[0139] The object-facing side of the light guide 113 is flat with a net aperture of 1.765865 mm; the image-facing side of the light guide 113 is flat with a net aperture of 1.399978 mm; the material of the light guide 113 is E48R, the length is 32.7 mm, and the distance between the light guide 113 and the second aperture 13 is 0.2 mm.

[0140] The second aperture 13 is planar, with a net aperture of 1.396536 mm and a distance of 4.2 mm between the second aperture 13 and the protective lens 121.

[0141] The protective lens 121 has a flat surface facing the object side and a net aperture of 2.4 mm; the protective lens 121 has a flat surface facing the image side and a net aperture of 2.4 mm; the protective lens 121 is made of N-BK7 material and has a thickness of 0.6 mm; the distance between the protective lens 121 and the filter 127 is 0.2 mm.

[0142] The filter 127 is planar, with a net aperture of 1.956938 mm and a distance of 0.1999367 mm between the filter 127 and the first convex lens 122.

[0143] The object-facing side of the first convex lens 122 is convex to the object side, with a radius of curvature of 1.672889 mm and a net aperture of 2.4 mm; the image-facing side of the first convex lens 122 is convex to the image side, with a radius of curvature of 2.872571 mm and a net aperture of 2.4 mm; the material of the first convex lens 122 is K26R, and the thickness is 0.9843793 mm; the distance between the first convex lens 122 and the first concave lens 123 is 0.3148351 mm.

[0144] The object-facing side of the first concave lens 123 is convex to the image side, with a radius of curvature of 1.558712 mm and a net aperture of 2 mm; the image-facing side of the first concave lens 123 is convex to the image side, with a radius of curvature of 9.296908 mm and a net aperture of 2.4 mm; the material of the first concave lens 123 is EP5000, and the thickness is 0.4999588 mm; the distance between the first concave lens 123 and the second concave lens 124 is 2.203409 mm.

[0145] The second concave lens 124 has an object-side surface that convexes towards the image side, a radius of curvature of 16.6465 mm, and a net aperture of 1.2 mm; the image-side surface of the second concave lens 124 also convexes towards the object side, a radius of curvature of 0.3804097 mm, and a net aperture of 0.6 mm; the second concave lens 124 is made of EP5000 and has a thickness of 0.4999985 mm; the distance between the second concave lens 124 and the second convex lens 125 is 0.3148351 mm.

[0146] The second convex lens 125 has an object-side surface that convexes towards the image side, a radius of curvature of 1.105022 mm, and a net aperture of 0.8 mm; the image-side surface of the second convex lens 125 has an image-side surface that convexes towards the image side, a radius of curvature of 0.8333165 mm, a net aperture of 1.6 mm, and a conic coefficient of 2.497126; the second convex lens 125 is made of EP5000 and has a thickness of 1.179615 mm; the distance between the second convex lens 125 and the infrared filter 126 is 1.193128 mm.

[0147] The infrared filter 126 has a flat surface facing the object side and a net aperture of 1.6 mm; the infrared filter 126 also has a flat surface facing the image side and a net aperture of 1.6 mm; the infrared filter 126 is made of N-BK7 material and has a thickness of 0.21 mm; the distance between the infrared filter 126 and the first image sensor 20 is 0.4 mm. The first image sensor 20 has a flat surface facing the object side and a net aperture of 6.9917051 mm.

[0148] In some embodiments, please refer to Figures 2 to 4. The extending direction of the light guide 113 is consistent with the arrangement direction of the light guide 113 and the front imaging device 111. The light guide 113 is used to transmit the main light ray with an angle α with its optical axis, where α is greater than or equal to -0.5° and less than or equal to 0.5°.

[0149] The light guide 113 is a column extending along a straight line. When the angle between the light and the optical axis of the light guide 113 is less than -0.5° or greater than 0.5°, the light cannot be transmitted from one end of the light guide 113 to the other end. Optionally, the light guide 113 can be a square column or a cylinder, etc.

[0150] The beneficial effects of this embodiment are as follows: compared with multiple rotating mirrors, the light guide 113 extends in a straight line, which facilitates installation and positioning. The light guide 113 can transmit light rays that are approximately parallel to the imaging lens group 12. The combination of the light guide 113 and the imaging lens group 12 enables the imaging device 10 to form a dual telecentric optical path, which can smoothly magnify the image.

[0151] In some embodiments, referring to Figures 2 to 4, the optical axis of the imaging lens group 12 coincides with the optical axis of the light guide 113.

[0152] The beneficial effects of this application embodiment are: the handle 15 of the endoscope 100 extends in the same direction as the light guide 113, and the optical axis of the imaging lens group 12 coincides with the optical axis of the light guide 113, so that the imaging lens group 12 can be installed in the handle 15 of the endoscope 100, and the overall volume of the endoscope 100 can be reduced.

[0153] In some embodiments, referring to FIG14, the optical axis of the imaging lens group 12 is set at an angle to the optical axis of the light guide 113. A deflection prism 14 is provided between the imaging lens group 12 and the light guide 113. The deflection prism 14 has a second reflecting surface 141. The second reflecting surface 141 is set at an angle to the optical axis of the light guide 113 and the optical axis of the imaging lens group 12. The deflection prism 14 is used to reflect the light transmitted by the light guide 113 toward the imaging lens group 12.

[0154] The second reflecting surface 141 of the deflecting prism 14 is a plane. The angle between the second reflecting surface 141 and the optical axis of the imaging lens group 12 and the angle between the second reflecting surface 141 and the optical axis of the light guide 113 are equal. The second reflecting surface 141 can reflect light rays parallel to the optical axis of the light guide 113 to be parallel to the optical axis of the imaging lens group 12. Optionally, the deflecting prism 14 may include a total internal reflection prism, etc. Optionally, the angle between the second reflecting surface 141 and the optical axis of the imaging lens group 12 is 45°, the angle between the second reflecting surface 141 and the optical axis of the light guide 113 is 45°, and the optical axis of the imaging lens group 12 is perpendicular to the optical axis of the light guide 113.

[0155] The beneficial effects of this application embodiment are as follows: the setting of the deflecting prism 14 can deflect the light path and can flexibly set the position of the imaging lens group 12 on the handle 15 of the endoscope 100. Compared with setting the imaging lens group 12 in the handle 15 of the endoscope 100, it can avoid the imaging lens group 12 being too large and affecting the size of the handle 15, which is convenient for operation.

[0156] In some embodiments, referring to Figures 2 and 3, the disposable image transmission light guide device 11 includes an auxiliary light source 112, which is located on the side of the front image capturing device 111 close to the object to be observed 50. The auxiliary light source 112 is used to provide illumination.

[0157] The auxiliary light source 112 is used to directly illuminate the object 50 to be observed. The auxiliary light source 112 can be located around the first light-incoming surface 1111 or around the second light-incoming surface 1114. Optionally, the auxiliary light source 112 may include one or more surface-mount LEDs (light-emitting diodes).

[0158] The beneficial effect of this application embodiment is that the auxiliary light source 112 can provide illumination, which can make the image of the object to be observed 50 clearer.

[0159] In some embodiments, referring to Figures 10 and 11, the endoscope 100 includes an illumination assembly 40, which includes a main light source 41 and a beam splitter 42. The main light source 41 is disposed on one side of the beam splitter 42 along the optical axis perpendicular to the light guide 113, and the main light source 41 is used to emit light to the beam splitter 42. The beam splitter 42 is disposed along the optical axis of the light guide 113 on the side of the imaging lens group 12 and the light guide 113 away from the front imaging device 111. The beam splitter 42 is used to reflect the light emitted by the main light source 41 to the light guide 113, and the beam splitter 42 is also used to transmit the light emitted by the light guide 113 to the beam splitter 42.

[0160] The main light source 41 can emit a beam of light with its center line perpendicular to the optical axis of the light guide 113 toward the beam splitter 42.

[0161] The beam splitter 42 reflects light rays perpendicular to the optical axis of the light guide 113 to a direction parallel to the optical axis of the light guide 113. The beam splitter 42 reflects light emitted from the main light source 41 into the light guide 113, allowing the illumination light to pass through the light guide 113 and the front-end imaging device 111 to the object 50, coupling the illumination light path into the imaging light path to achieve coaxial coupling confocal illumination. Optionally, the beam splitter 42 may include a 50 / 50 beam splitter 42 or a polarizing beam splitter 42, etc. Optionally, the first light-entry surface 1111 of the front-end imaging device 111 convexes towards the object 50 to converge the illumination light.

[0162] Optionally, a collimating lens 43 is provided between the main light source 41 and the beam splitter 42. The collimating lens 43 is used to collimate the beam emitted by the main light source 41 into a parallel beam. The collimating lens 43 includes a plano-convex lens, a concave-convex lens, or a total internal reflection lens. One or more collimating lenses 43 may be provided.

[0163] The beneficial effects of this application embodiment are as follows: the beam splitter 42 can reflect the light emitted by the main light source 41 into the light guide 113, so that the illumination light can be transmitted to the object to be observed 50 through the light guide 113, and the illumination light path is coupled into the imaging light path. Compared with using two light paths to transmit the illumination light and the imaging light separately, the imaging light path and the illumination light path share the same light path, making the disposable image transmission light guide device 11 smaller in size and convenient to put the disposable image transmission light guide device 11 into a small space.

[0164] In some embodiments, please refer to FIG2, the disposable image transmission light guide device 11 further includes a housing 114 extending along the length direction of the light guide 113. The light guide 113 and the front-end image acquisition device 111 are disposed in the housing 114. The disposable image transmission light guide device 11 is detachably connected to the imaging lens group 12. The light guide 113 and the housing 114 are connected by double injection molding.

[0165] The housing 114 supports and protects the light guide 113 and the front imaging device 111. Optionally, the housing 114 can be connected to the imaging lens group 12 via a threaded connection or a snap-fit ​​connection for easy assembly and disassembly. Optionally, both the housing 114 and the imaging lens group 12 are connected to the handle 15 of the endoscope 100, and the housing 114 is detachably connected to the imaging lens group 12 via the handle 15.

[0166] The outer shell 114 and the light guide 113 can be injection molded in the same mold, achieving connection and fixation at the same time as injection molding.

[0167] Optionally, the auxiliary light source 112 is fixedly connected to the housing 114.

[0168] The beneficial effects of this application embodiment are as follows: the disposable image transmission light guide device 11 can be connected to the imaging lens group 12 as a whole through the housing 114, which facilitates the disassembly and assembly of the disposable image transmission light guide device 11. The housing 114 and the light guide 113 are connected together during injection molding, which reduces assembly difficulty, increases assembly accuracy, and reduces manufacturing difficulty.

[0169] In some embodiments, please refer to FIG2, the disposable image transmission light guide device 11 further includes a housing 114 extending along the length direction of the light guide 113. The light guide 113 and the front-end image acquisition device 111 are disposed in the housing 114. The disposable image transmission light guide device 11 is detachably connected to the imaging lens group 12. The light guide 113 and the housing 114 are interference-fitted.

[0170] It is understood that the light guide 113 and the housing 114 can be molded separately, and the light guide 113 can be inserted into the housing 114 and press-fitted with the housing 114.

[0171] The beneficial effects of this application embodiment are: the light guide 113 and the outer shell 114 are interference-fitted, and the light guide 113 and the outer shell 114 can be manufactured separately, making the production method more flexible.

[0172] In some embodiments, please refer to FIG18, the endoscope 100 includes two magnifying devices 30, namely a first magnifying device 35 and a second magnifying device 36. The photoelectric conversion device 31 in the first magnifying device 35 is electrically connected to the first image sensor 20; the photoelectric conversion device 31 in the second magnifying device 36 is electrically connected to the second image sensor 34 in the first magnifying device 35.

[0173] The input terminal of the photoelectric conversion device 31 in the first amplification device 35 is electrically connected to the first image sensor 20, and the output terminal of the photoelectric conversion device 31 in the first amplification device 35 is electrically connected to the image display 32 in the first amplification device 35.

[0174] The input terminal of the photoelectric conversion device 31 in the second amplification device 36 is electrically connected to the second image sensor 34 in the first amplification device 35, and the output terminal of the photoelectric conversion device 31 in the second amplification device 36 is electrically connected to the image display 32 in the second amplification device 36.

[0175] The working process of the first amplification device 35 and the second amplification device 36 is as follows: the photoelectric conversion device 31 in the first amplification device 35 converts the image collected by the first image sensor 20 into an electrical signal and transmits the electrical signal to the image display 32 in the first amplification device 35; the image display 32 in the first amplification device 35 displays the image according to the electrical signal transmitted by the photoelectric conversion device 31 and emits light to the magnifying lens group 33 in the first amplification device 35; the magnifying lens group 33 in the first amplification device 35 magnifies the image displayed by the image display 32 and transmits it to the second image sensor 34; the second image sensor 34 in the first amplification device 35 collects the image pixels transmitted by the magnifying lens group 33. The photoelectric conversion device 31 in the second magnifying device 36 converts the image acquired by the second image sensor 34 in the first magnifying device 35 into an electrical signal, and transmits the electrical signal to the image display 32 in the second magnifying device 36. The image display 32 in the second magnifying device 36 displays the image according to the electrical signal transmitted by the photoelectric conversion device 31, and emits light to the magnifying lens group 33 in the second magnifying device 36. The magnifying lens group 33 in the second magnifying device 36 magnifies the image displayed by the image display 32 and transmits it to the second image sensor 34. The second image sensor 34 in the second magnifying device 36 acquires the image pixels transmitted by the magnifying lens group 33. After the final image acquired by the second image sensor 34 is transmitted to an external display screen, the image can be observed.

[0176] The beneficial effects of this application embodiment are: the imaging device 10, the first magnifying device 35 and the second magnifying device 36 can perform three-level magnification of the image, making the image clearer.

[0177] In some embodiments, the endoscope 100 includes at least three magnifying devices 30.

[0178] It is understandable that the amplification device 30 can be set to three or more.

[0179] The connection method between adjacent amplification devices 30 is the same as the connection method between the first amplification device 35 and the second amplification device 36.

[0180] The beneficial effects of this application embodiment are: multiple magnification devices 30 can magnify the image at multiple levels, which can make the image have less distortion and increase the magnification factor of the image.

[0181] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An endoscope, characterized in that, include: Imaging device, used to transmit images; A first image sensor is disposed on the image side of the imaging device. The first image sensor is used to receive light transmitted by the imaging device and acquire images. A magnifying device is provided, comprising a photoelectric conversion device, an image display, a second image sensor, and a magnifying lens group. The photoelectric conversion device is electrically connected to the first image sensor and the image display. The photoelectric conversion device converts the image acquired by the first image sensor into an electrical signal and transmits it to the image display. The image display receives the electrical signal transmitted by the photoelectric conversion device and displays the image. The image display is located on the object side of the magnifying lens group, and the second image sensor is located on the image side of the magnifying lens group. The magnifying lens group magnifies the image displayed on the image display and projects the magnified image onto the second image sensor.

2. The endoscope as described in claim 1, characterized in that, The magnifying lens group includes a double telecentric lens.

3. The endoscope as described in claim 2, characterized in that, The magnifying lens group includes a first concave-convex lens, a first cemented doublet lens, a first aperture stop, a second cemented doublet lens, a third cemented doublet lens, a second concave-convex lens, a third concave-convex lens, a fourth concave-convex lens, and a fifth concave-convex lens arranged sequentially from the image display to the second image sensor. The first concave-convex lens is used to converge the light transmitted from the image display and transmit the light to the first cemented doublet lens. The first cemented doublet lens is used to converge the light transmitted from the first concave-convex lens and transmit the light to the second cemented doublet lens. The second cemented doublet lens is used to converge the light transmitted from the first cemented doublet lens and transmit the light to the third cemented doublet lens. The third cemented doublet lens is used to converge the light transmitted from the second cemented doublet lens and transmit the light to the second concave-convex lens. The second concave-convex lens is used to diverge the light transmitted from the third cemented doublet lens and transmit the light to the third concave-convex lens. The third concave-convex lens is used to diverge the light transmitted from the second concave-convex lens and transmit the light to the fourth concave-convex lens. The fourth concave-convex lens is used to converge the light transmitted from the third concave-convex lens and transmit the light to the fifth concave-convex lens. The fifth concave-convex lens is used to converge the light transmitted from the fourth concave-convex lens and form parallel light. The second image sensor is used to receive the parallel light emitted from the fifth concave-convex lens.

4. The endoscope as described in claim 1, characterized in that, The imaging device includes a disposable image transmission light guide device and an imaging lens group. The disposable image transmission light guide device includes a front-end image acquisition device and a light guide component. The front-end image acquisition device is located on the image acquisition side of the light guide component. The light guide is disposed between the front-end image capturing device and the imaging lens group; the first image sensor is disposed on the image side of the imaging lens group; The front-end imaging device is used to receive the light reflected from the object to be observed and transmit the light to the light guide; the light guide is used to receive the light transmitted by the front-end imaging device and transmit the light to the imaging lens group; the imaging lens group is used to receive the light transmitted by the light guide and transmit the light to the first image sensor.

5. The endoscope as described in claim 4, characterized in that, The front-end imaging device includes a first light-inlet surface, a first reflective surface, and a first light-outlet surface; the first light-inlet surface and the first reflective surface are arranged along a first direction, which is perpendicular to the optical axis of the light guide; the first light-inlet surface is used to transmit light reflected by the object to be observed; the first reflective surface is arranged at an angle to the first light-inlet surface and the first light-outlet surface; the first reflective surface is used to reflect the light transmitted by the first light-inlet surface and reflect the light towards the light guide; the first light-outlet surface and the first reflective surface are arranged along the optical axis of the light guide; the first light-outlet surface is used to transmit light reflected by the first reflective surface. Alternatively, the front-end imaging device extends along the optical axis of the light guide, and the front-end imaging device has a second light-inlet surface and a second light-outlet surface, which are respectively located at both ends of the front-end imaging device along the optical axis of the light guide.

6. The endoscope as described in claim 5, characterized in that, The first light-incoming surface is an arc surface or a plane, the first reflective surface is an arc surface or a plane, and the first light-outcoming surface is an arc surface or a plane.

7. The endoscope as described in claim 4, characterized in that, Optical adhesive is provided between the front-end imaging device and the light guide, and the thickness of the optical adhesive ranges from 5um to 10um. Alternatively, the front-end imaging device and the light guide are an integral structure.

8. The endoscope as described in claim 4, characterized in that, The imaging lens group includes a first convex lens, a first concave lens, a second concave lens, and a second convex lens arranged sequentially from the object side to the image side along its optical axis. The first convex lens is used to converge the light transmitted by the light guide and transmit the light to the first concave lens. The first concave lens is used to diverge the light transmitted by the first convex lens and transmit the light to the second concave lens. The second concave lens is used to diverge the light transmitted by the first concave lens and transmit the light to the second convex lens. The second convex lens is used to converge the light transmitted by the second concave lens and form parallel light. The first image sensor is used to receive the parallel light emitted from the second convex lens.

9. The endoscope as described in claim 8, characterized in that, The imaging lens group includes at least one aspherical surface; the refractive index of the first convex lens and the second convex lens ranges from 1.49 to 1.65; the refractive index of the first concave lens and the second concave lens ranges from 1.55 to 1.

95.

10. The endoscope as described in claim 8, characterized in that, The imaging lens group further includes a protective lens and an infrared filter. The protective lens is disposed on the side of the first convex lens away from the first concave lens; the infrared filter is disposed between the second convex lens and the first image sensor.

11. The endoscope as described in claim 4, characterized in that, The extension direction of the light guide is consistent with the arrangement direction of the light guide and the front-end imaging device. The light guide is used to transmit the main ray with an angle α with its optical axis, where α is greater than or equal to -0.5° and less than or equal to 0.5°.

12. The endoscope as described in claim 4, characterized in that, The optical axis of the imaging lens group coincides with the optical axis of the light guide; Alternatively, the optical axis of the imaging lens group is set at an angle to the optical axis of the light guide, and a deflecting prism is provided between the imaging lens group and the light guide. The deflecting prism has a second reflecting surface, which is set at an angle to the optical axis of the light guide and the optical axis of the imaging lens group. The deflecting prism is used to reflect the light transmitted by the light guide towards the imaging lens group.

13. The endoscope as described in claim 4, characterized in that, The disposable image transmission light guide device includes an auxiliary light source, which is located on the side of the front-end image acquisition device close to the object to be observed, and the auxiliary light source is used to provide illumination.

14. The endoscope as described in any one of claims 4-13, characterized in that, The endoscope includes an illumination assembly, which includes a main light source and a beam splitter. The main light source is located on one side of the beam splitter along the optical axis perpendicular to the light guide, and is used to emit light towards the beam splitter. The beam splitter is located on the side of the imaging lens group and the light guide away from the front imaging device, along the optical axis of the light guide. The beam splitter is used to reflect the light emitted by the main light source towards the light guide, and is also used to transmit the light emitted by the light guide towards the beam splitter.

15. The endoscope as described in any one of claims 4-13, characterized in that, The disposable image transmission light guide device also includes a housing extending along the length of the light guide, the light guide and the front-end image acquisition device are disposed inside the housing, and the disposable image transmission light guide device is detachably connected to the imaging lens group; The light guide component and the outer casing component are connected by double-material injection molding; Alternatively, the light guide component may be interference-fitted with the housing component.

16. The endoscope as described in any one of claims 1-13, characterized in that, The endoscope includes two magnifying devices, which are a first magnifying device and a second magnifying device, respectively. The photoelectric conversion device in the first amplification device is electrically connected to the first image sensor; The photoelectric conversion device in the second amplification device is electrically connected to the second image sensor in the first amplification device.

17. The endoscope as claimed in claim 16, characterized in that, The endoscope includes at least three of the aforementioned magnifying devices.

Images