Fluorescent camera shooting bayonet and endoscope system

Abstract

The utility model relates to a fluorescence camera shooting bayonet and an endoscope system. The fluorescence camera shooting bayonet is sequentially provided with a front protection sheet, an optical lens group and a band elimination optical filter in the direction from the object side to the image side. The plane where the band-stop optical filter is located intersects with the plane where the front protection sheet is located. According to the three-dimensional endoscope, the distortion is small, an MTF modulation function tends to the diffraction limit, the maximum radiuses of imaging confusion spots in different view fields are all within the Airy spot radius range, the three-dimensional endoscope can achieve clear imaging within the wide waveband range, ghost images of the endoscope are eliminated, and observation and operation convenience of a user is improved; a prism model is further added, and endoscope visible light imaging and endoscope ICG (indocyanine green) fluorescence imaging can be simultaneously carried out by using a fluorescence camera shooting bayonet.

Description

Technical Field

[0001] The present application relates to the technical field of medical equipment, and in particular to a fluorescent camera mount and an endoscope system. Background Art

[0002] With the development of medical equipment technology, endoscope technology has emerged. The rigid endoscope system includes an endoscope, a camera system and a display. Endoscopes need to undergo repeated cleaning, sterilization and disinfection processes in clinical applications. Due to the need for sterilization, the entire optical system of the endoscope needs to be completely sealed with two front and rear protective windows. The camera system includes an imaging group, an image sensor and at least one protective window. In the fluorescent camera bayonet, a band-stop filter with laser blocking needs to be added to the system.

[0003] In traditional technology, the front and rear protective windows of the endoscope, the protective window of the camera system, and the band-stop filter are all flat. Since the outgoing light beam of the endoscope is parallel light, the surface reflection on the rear protective window of the endoscope, the protective window of the camera system, and the rear end band-stop filter will form secondary or multiple reflection images on the image sensor, that is, the ghost image formed is much lower in brightness than the normal image. When an instrument with a strong surface reflection enters the field of view of the endoscope, a strong ghost image will be formed, affecting the user's observation and operation. Summary of the invention

[0004] Based on this, it is necessary to overcome the defects of the prior art and provide a fluorescent camera mount, which can have high resolution while having small distortion, MTF modulation function approaching the diffraction limit, and the maximum radius of the diffusion spot of imaging in different fields of view are all within the range of the Airy disk radius, and the stereo endoscope can clearly image within a wider band range, eliminate the ghost image of the endoscope, and improve the convenience of observation and operation for users; further, a prism model is added, and the fluorescent camera mount can be used to simultaneously perform endoscopic visible light imaging and endoscopic ICG (indocyanine green) fluorescence imaging.

[0005] The technical solution is as follows: a fluorescent camera mount, wherein a front protective sheet, an optical lens group and a filter assembly are sequentially arranged along the direction from the object side to the image side, and the plane where the filter assembly is located intersects with the plane where the front protective sheet (100) is located.

[0006] The above-mentioned fluorescent camera mount is provided with a front protective film, an optical lens group and a band-stop filter in sequence along the direction from the object side to the image side; the plane where the band-stop filter is located intersects with the plane where the front protective film is located. While having high resolution, its distortion is small, the MTF modulation function tends to the diffraction limit, and the maximum radius of the diffuse spots of different field imaging is all within the radius of the Airy disk. Moreover, the stereo endoscope can clearly image in a wider band range, eliminate the ghost image of the endoscope, and improve the convenience of observation and operation for users; further, a prism model is added, and the fluorescent camera mount can be used to simultaneously perform endoscopic visible light imaging and endoscopic ICG (indocyanine green) fluorescence imaging.

[0007] In one of the embodiments, the angle between the plane where the filter assembly is located and the plane where the front protective film is located is greater than or equal to 12 degrees and less than or equal to 16 degrees.

[0008] In one of the embodiments, according to the fluorescent camera mount, it is characterized in that the filter component is a band-stop filter, or a filter film attached to the lens closest to the image side in the optical lens group.

[0009] In one embodiment, the optical lens group is composed of a first cemented lens, a first lens, a second cemented lens, and a second lens from the object side to the image side.

[0010] In one embodiment, the first cemented lens includes a first object side cemented lens and a first image side cemented lens from the object side to the image side; the refractive index value range of the first object side cemented lens is greater than the refractive index value range of the first image side cemented lens, and the Abbe number value range of the first object side cemented lens is the same as the Abbe number value range of the first image side cemented lens.

[0011] In one embodiment, the refractive index value range of the first lens is the same as the refractive index value range of the first image-side cemented lens, and the Abbe number value range of the first lens is greater than the Abbe number value range of the first image-side cemented lens.

[0012] In one embodiment, the second cemented lens includes a second object side cemented lens and a second image side cemented lens from the object side to the image side; the refractive index value range of the second object side cemented lens is the same as the refractive index value range of the first image side cemented lens, and the Abbe number value range of the second object side cemented lens is the same as the Abbe number value range of the first image side cemented lens; the refractive index value range of the second image side cemented lens is smaller than the refractive index value range of the second object side cemented lens, and the Abbe number value range of the second image side cemented lens is larger than the Abbe number value range of the first lens.

[0013] In one embodiment, the refractive index value range of the second lens is the same as the refractive index value range of the second image-side cemented lens, and the Abbe number value range of the second lens is the same as the Abbe number value range of the second image-side cemented lens.

[0014] In one of the embodiments, a prism model is further provided at one end of the band-stop filter close to the image side; the refractive index value range of the prism model is greater than the refractive index value range of the first lens, and the Abbe number value range of the prism model is the same as the Abbe number value range of the first lens.

[0015] In one of the embodiments, the fluorescent camera mount is also provided with a rear protective plate between the band-stop filter and the prism model; the refractive index value ranges of the front protective plate, the band-stop filter and the rear protective plate are the same as the refractive index value range of the second lens; the Abbe number value ranges of the front protective plate, the band-stop filter and the rear protective plate are between the Abbe number value range of the second image-side cemented lens and the Abbe number value range of the first lens.

[0016] In one of the embodiments, a detector surface is further provided at one end of the prism model close to the image side.

[0017] In one embodiment, the first cemented lens has a surface facing the object side as a first surface and a surface facing the image side as a second surface; and the curvature radii of the first surface and the second surface are infinite.

[0018] In one embodiment, the surface of the first lens facing the object side is the third surface, the cemented surface is the fourth surface, and the surface facing the image side is the fifth surface; the curvature radius of the third surface is 12.8 mm and is concave toward the image side, the curvature radius of the fourth surface is -18.8 mm and is convex toward the image side, and the curvature radius of the fifth surface is 8.9 mm and is concave toward the image side.

[0019] In one embodiment, the surface of the second cemented lens facing the object side is the sixth surface, and the surface facing the image side is the seventh surface; the curvature radius of the sixth surface is -7.3 mm and is convex to the image side, and the curvature radius of the seventh surface is -14 mm and is convex to the image side.

[0020] In one embodiment, the surface of the second lens facing the object side is the eighth surface, the cemented surface is the ninth surface, and the surface facing the image side is the tenth surface; the curvature radius of the eighth surface is -30.7 mm and is convex to the image side, the curvature radius of the ninth surface is 13.0 mm and is concave to the image side, and the curvature radius of the tenth surface is -16.4 mm and is convex to the image side.

[0021] In one embodiment, the endoscope system includes a fluorescent camera mount.

[0022] The above-mentioned fluorescent camera mount is provided with a front protective film, an optical lens group and a band-stop filter in sequence along the direction from the object side to the image side; the plane where the band-stop filter is located intersects with the plane where the front protective film is located. While having high resolution, its distortion is small, the MTF modulation function tends to the diffraction limit, and the maximum radius of the diffuse spots of different field imaging is all within the radius of the Airy disk. Moreover, the stereo endoscope can clearly image in a wider band range, eliminate the ghost image of the endoscope, and improve the convenience of observation and operation for users; further, a prism model is added, and the fluorescent camera mount can be used to simultaneously perform endoscopic visible light imaging and endoscopic ICG (indocyanine green) fluorescence imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 Schematically shows the structure of the fluorescent camera mount for an endoscope and the optical path diagram according to one embodiment of the present application;

[0026] Figure 2 is a diagram schematically showing an MTF modulation variation curve according to an embodiment of the present application;

[0027] Figure 3 is a schematic diagram showing a spherical aberration curve according to an embodiment of the present application;

[0028] Figure 4 is a diagram schematically showing an astigmatism curve according to an embodiment of the present application;

[0029] Figure 5 is a diagram schematically showing a distortion curve according to an embodiment of the present application;

[0030] Figure 6 is a diagram schematically showing another distortion curve according to an embodiment of the present application;

[0031] Figure 7Schematically shows the structure of the fluorescent camera mount for an endoscope and a light path diagram according to another embodiment of the present application;

[0032] Figure 8 is a diagram schematically showing an MTF modulation variation curve in another embodiment of the present application;

[0033] Among them, 100, front protective film; 200, optical lens group; 300, band-stop filter; 400, rear protective film; 500, prism model; 600, detector surface; 700, filter film;

[0034] 210, first cemented lens; 220, first lens; 230, second cemented lens; 240, second lens;

[0035] 211, a first object-side cemented lens; 212, a first image-side cemented lens; 231, a second object-side cemented lens; 232, a second image-side cemented lens. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0037] Since the front and rear protective windows, the protective window of the camera system and the band-stop filter 300 of the traditional endoscope are all planes. Since the outgoing light beam of the endoscope is parallel light, the surface reflection on the rear protective window of the endoscope, the protective window of the camera system and the rear end band-stop filter 300 will form secondary or multiple reflection images on the image sensor, that is, the brightness of the ghost image formed is much lower than that of the normal image. When an instrument with strong surface reflection enters the field of view of the endoscope, a strong ghost image will be formed, affecting the user's observation and operation. The fluorescent camera mount of the present application is provided with a front protective plate 100, an optical lens group 200 and a filter assembly in sequence along the direction from the object side to the image side, and the plane where the filter assembly is located intersects with the plane where the front protective plate 100 is located. It can have high resolution while having small distortion, MTF modulation function approaching the diffraction limit, and the maximum radius of the diffuse spots of imaging in different fields of view are all within the radius of the Airy disk. The stereo endoscope can clearly image in a wider band, eliminating ghost images of the endoscope and improving the convenience of observation and operation for users. Further, a prism model 500 is added, and a fluorescent camera mount can be used to simultaneously perform endoscopic visible light imaging and endoscopic ICG (indocyanine green) fluorescence imaging.

[0038] Based on this, Figure 1 The structure and optical path diagram of the fluorescent camera mount for an endoscope in the first embodiment of the present application are shown; wherein the fluorescent camera mount is provided with a front protective film 100, an optical lens group 200 and a filter assembly in sequence along the direction from the object side to the image side, and the plane where the filter assembly is located intersects with the plane where the front protective film 100 is located.

[0039] Specifically, the front protective film 100, the optical lens group 200 and the filter assembly are sequentially arranged along the direction from the object side to the image side. During the working process, the front protective film 100 is first used as the first protective layer to effectively prevent damage and contamination of the endoscope by external objects. Subsequently, the optical lens group 200 is responsible for focusing the light to ensure clear transmission of the imaging. The filter assembly is behind it, and has the function of blocking or selectively transmitting light of a specific wavelength, thereby improving the capture and imaging quality of the fluorescent signal. It is particularly noteworthy that the plane where the filter assembly is located intersects with the plane where the front protective film 100 is located. Among them, there are three situations where the plane where the filter assembly is located intersects with the plane where the front protective film 100 is located: first, the front protective film 100 is tilted relative to the main optical axis; 2. The filter assembly is tilted relative to the main optical axis; 3. The front protective film 100 and the filter assembly are both tilted relative to the main optical axis, which can maximize the use of the light path and ensure that the optical performance of the endoscope is effectively exerted. Such a structural design enables the endoscope to achieve accurate and clear imaging in the fields of medicine and scientific research.

[0040] In a specific embodiment, the focal length of the camera is 27mm, the entrance pupil diameter is 5mm, and it is connected to a detector chip with a 4K resolution of 1 / 1.8 inches, achieving a high resolution of eight million pixels (3840×2160) and a maximum distortion of less than 2%. Imaging within the field of view range of 0 to 18° can be achieved according to the real image height. The relative illumination of the fluorescent camera bayonet is above 90%, and the fluorescent camera bayonet can clearly image within the wide band range of 460 to 860nm, and can simultaneously perform visible light imaging and near-infrared imaging. The light passes through the front protective film 100, the optical lens group 200, the filter component, the rear protective film 400 and the prism model 500 (only the transmission path model is used) arranged in sequence along the direction from the object side to the image side, and finally high-resolution imaging is performed on the detector target surface. Through the image-side telecentric structure, the parallelism of the main light from the central field of view to the edge field of view is guaranteed, the incident angle of the filter component is reduced, and the filter component is guaranteed to effectively filter out the laser and improve the sensitivity of fluorescent imaging.

[0041] The above-mentioned fluorescent camera mount is provided with a front protective film 100, an optical lens group 200 and a filter assembly in sequence along the direction from the object side to the image side, and the plane where the filter assembly is located intersects with the plane where the front protective film 100 is located. While having high resolution, its distortion is small, the MTF modulation function tends to the diffraction limit, and the maximum radius of the diffuse spots of different field imaging is all within the radius of the Airy disk. Moreover, the stereo endoscope can clearly image in a wide band range, eliminate the ghost image of the endoscope, and improve the convenience of observation and operation for users; further, a prism model 500 is added, and the fluorescent camera mount can be used to simultaneously perform endoscopic visible light imaging and endoscopic ICG (indocyanine green) fluorescence imaging.

[0042] In one embodiment, continue as Figure 1 The angle between the plane where the filter assembly is located and the plane where the front protective sheet is located is in a range of greater than or equal to 12 degrees and less than or equal to 16 degrees.

[0043] Specifically, during the operation of the fluorescent camera mount, the setting of the angle between the plane where the filter assembly is located and the plane where the front protective film 100 is located helps to optimize the incidence and transmission of light, ensuring that the light passes through the filter assembly at an appropriate angle. By controlling the value range of the angle, the incident angle of the light can be adjusted to improve the transmittance of the optical system to light of a specific wavelength. This is crucial for fluorescent imaging because it helps to selectively transmit or block fluorescent signals of a specific wavelength, thereby improving the contrast and clarity of the imaging.

[0044] In this embodiment, by properly setting the angle between the band-stop filter and the front protective film, the optical performance of the endoscope system can be optimized, especially in fluorescence imaging applications. This design of the fluorescence camera bayonet enables the optical system to capture and modulate the fluorescence signal more accurately, thereby improving the quality and accuracy of imaging.

[0045] In one embodiment, continue as Figure 1 The filter assembly is a band-stop filter 300 , or a filter film 700 attached to the lens closest to the image side in the optical lens group 200 .

[0046] Specifically, the band-stop filter 300 constitutes a filter assembly, and the plane where the band-stop filter 300 is located intersects with the plane where the front protective film 100 is located. The implementation of this cross design involves the propagation and modulation of light. The main function of the band-stop filter 300 is to selectively transmit or block light of specific wavelengths. This includes fluorescent wavelengths commonly used in the fields of medicine and scientific research. The plane of the band-stop filter 300 intersects with the plane of the front protective film 100 to form an optical interface. At this interface, light is refracted and transmitted between the two planes. According to parameters such as the characteristics of light and the refractive index of the material, the propagation direction and transmittance of the light can be regulated.

[0047] In this embodiment, precise control of light is achieved by the intersection of the band-stop filter 300 and the front protective film 100. This helps to selectively transmit or block fluorescent signals of specific wavelengths in fluorescent imaging applications, thereby improving the contrast and clarity of imaging. At the same time, the front protective film 100 can protect the internal optical components from the external environment. Overall, this cross design helps to optimize the optical performance of the endoscope system and provide a more efficient and reliable optical filtering function.

[0048] In one embodiment, Figure 7 Another example of an endoscope fluorescent camera mount structure and optical path diagram is shown. The optical lens group (200) closest to the image side includes the filter assembly, and the lens of the filter assembly is attached with a filter film (700).

[0049] Specifically, the structure of the fluorescent camera mount is provided with a front protective film 100 and an optical lens group 200 in sequence along the direction from the object side to the image side. In the optical lens group 200, the lens closest to the image side is attached with a filter film 700. During operation, the front protective film 100 first receives and transmits light to protect the internal optical components from the external environment. The optical lens group 200 further adjusts the propagation direction and focal length of the light to complete the imaging of the observed target. Among them, a filter film 700 is attached to the lens closest to the image side, which is used to selectively transmit or block light of a specific wavelength to achieve modulation and enhancement of the fluorescent signal.

[0050] like Figure 7 As shown in FIG. 1 , the band-stop filter 300 is removed, and two filter films 700 are plated on the front and rear surfaces of the last lens to replace the function of the band-stop filter 300. The MTF modulation change curve is shown in FIG. Figure 8 shown.

[0051] At 200lp / mm, the MTF value is greater than 0.1. Figure 8The MTF curves corresponding to the meridian and sagittal planes at five different positions of the central field of view, 1mm field of view, 2mm field of view, 3mm field of view, and 4.4mm field of view at a frequency of 0-200lp / mm are given, and the MTF curve under the diffraction limit condition is given for comparison. Figure 8 It can be seen that its MTF is also close to the diffraction limit, and the imaging quality is good.

[0052] In this embodiment, by arranging the front protective sheet 100 and the optical lens group 200 layer by layer and attaching the filter film 700 to the last lens, the fluorescence camera mount can achieve precise control of light and optimal capture of fluorescence signals. This design enables the endoscope system to more effectively improve the imaging quality when performing fluorescence imaging, providing a more accurate and reliable imaging tool for the medical and scientific research fields.

[0053] In one embodiment, continue as Figure 1 The optical lens group 200 includes a first cemented lens 210, a first lens 220, a second cemented lens 230, and a second lens 240 from the object side to the image side.

[0054] Specifically, the optical lens group 200 of the fluorescent camera mount includes a first cemented lens 210, a first lens 220, a second cemented lens 230 and a second lens 240 in order from the object side to the image side. During operation, the first cemented lens 210 first receives the light transmitted through the front protective film 100, and plays a role of focusing and refraction through its cemented lens structure. Then, the first lens 220 further adjusts the direction and focal length of the light to achieve a more precise focusing effect. The second cemented lens 230 modulates the light again through its cemented lens structure to enhance the optical performance of the lens group. Finally, the second lens 240 is responsible for transmitting the adjusted light to the band-stop filter 300. This layered lens design is organically combined in the optical lens group 200, and the clarity and quality of imaging are further improved by adjusting the optical path.

[0055] In this embodiment, by adopting the structure of cemented lenses, multiple modulations of light are achieved, the focusing effect is optimized, and the imaging accuracy is improved. The step-by-step design of the lens group helps to minimize optical distortion and provide more accurate imaging results. In addition, the structural design of the lens group enables the fluorescent camera mount to more effectively capture subtle fluorescent signals when performing fluorescent imaging, thereby providing a more reliable imaging tool in the fields of medicine and scientific research.

[0056] In one embodiment, continue as Figure 1The first cemented lens 210 includes a first object-side cemented lens 211 and a first image-side cemented lens 212 from the object side to the image side; the refractive index value range of the first object-side cemented lens 211 is greater than the refractive index value range of the first image-side cemented lens 212, and the Abbe number value range of the first object-side cemented lens 211 is the same as the Abbe number value range of the first image-side cemented lens 212.

[0057] Specifically, the first cemented lens 210 of the fluorescent camera mount includes a first object side cemented lens 211 and a first image side cemented lens 212 from the object side to the image side. During operation, the first object side cemented lens 211 first receives light from the front protective film 100, and focuses and refracts the light through its cemented lens structure. At the same time, the first image side cemented lens 212 further adjusts the direction and focal length of the light to ensure the accuracy of imaging. It is worth noting that the refractive index value range of the first object side cemented lens 211 is greater than the refractive index value range of the first image side cemented lens 212, while their Abbe number value ranges are the same.

[0058] In this embodiment, by selecting the first object-side cemented lens 211 with a larger refractive index, a stronger light focusing effect is achieved, thereby improving the resolution of imaging. Keeping the Abbe number within the same range helps to mitigate the optical distortion caused by the lens shape and ensure the accuracy of the image. This enables the fluorescent camera mount to better cope with different optical requirements when performing imaging, providing a higher quality imaging tool for the medical and scientific research fields.

[0059] In one embodiment, continue as Figure 1 The refractive index value range of the first lens 220 is the same as that of the first image-side cemented lens 212 , and the Abbe number value range of the first lens 220 is greater than that of the first image-side cemented lens 212 .

[0060] Specifically, in the optical lens group 200 of the fluorescent camera mount, the design of the first lens 220 adopts a specific structure. Its refractive index value range is the same as that of the first image side cemented lens 212, which means that it has similar optical properties to the adjacent lens. However, it is worth noting that the Abbe number value range of the first lens 220 is greater than the Abbe number value range of the first image side cemented lens 212. During operation, the first lens 220 is responsible for further adjusting the propagation direction and focal length of the light to ensure the clarity and accuracy of the imaging. By keeping the refractive index matching that of the adjacent lenses, the first lens 220 helps to guide the light smoothly and maintain the consistency of the entire lens system. At the same time, by selecting the first lens 220 with a larger Abbe number, optical distortion is reduced and the quality and accuracy of imaging are improved.

[0061] In this embodiment, the increase in the range of the Abbe number of the first lens 220 helps to reduce the aberration caused by the lens shape, thereby improving the imaging performance of the fluorescence camera mount. Such an optimized design enables the fluorescence camera mount to more effectively perform high-quality imaging in medical and scientific research applications.

[0062] In one embodiment, continue as Figure 1 The second cemented lens 230 includes a second object-side cemented lens 231 and a second image-side cemented lens 232 from the object side to the image side; the refractive index value range of the second object-side cemented lens 231 is the same as the refractive index value range of the first image-side cemented lens 212, and the Abbe number value range of the second object-side cemented lens 231 is the same as the Abbe number value range of the first image-side cemented lens 212; the refractive index value range of the second image-side cemented lens 232 is smaller than the refractive index value range of the second object-side cemented lens 231, and the Abbe number value range of the second image-side cemented lens 232 is larger than the Abbe number value range of the first lens 220.

[0063] Specifically, the second cemented lens 230 of the fluorescent camera mount includes a second object-side cemented lens 231 and a second image-side cemented lens 232 from the object side to the image side. During operation, the refractive index value range of the second object-side cemented lens 231 is the same as that of the first image-side cemented lens 212, which maintains the consistency of the lens group and a smooth optical path. At the same time, the Abbe number value range of the second object-side cemented lens 231 is the same as that of the first image-side cemented lens 212, which helps to reduce aberrations in the lens system and improve the quality of imaging.

[0064] In the rear section of the lens group, the refractive index range of the second image side cemented lens 232 is smaller than the refractive index range of the second object side cemented lens 231, while its Abbe number range is larger than the Abbe number range of the first lens 220. Such a design enables the second image side cemented lens 232 to adjust light more effectively, reduce optical distortion and improve the clarity of imaging.

[0065] In this embodiment, by introducing this differentiated design in the lens group, the fluorescent camera mount can more comprehensively meet different optical requirements, and provide a more flexible and efficient imaging tool for the medical and scientific research fields.

[0066] In one embodiment, continue as Figure 1 The refractive index value range of the second lens 240 is the same as the refractive index value range of the second image-side cemented lens 232 , and the Abbe number value range of the second lens 240 is the same as the Abbe number value range of the second image-side cemented lens 232 .

[0067] Specifically, in the optical lens group 200 of the fluorescent camera mount, the design of the second lens 240 adopts a specific structure. Its refractive index value range is the same as that of the second image side cemented lens 232, ensuring the consistency of the lens group and the smooth transition of the optical path. At the same time, the Abbe number value range of the second lens 240 also matches that of the second image side cemented lens 232.

[0068] During operation, the second lens 240 is responsible for further adjusting the propagation direction and focal length of the light to ensure the clarity and accuracy of the imaging. By keeping the refractive index matching that of the adjacent lens, the second lens 240 helps to smoothly guide the light and maintain the consistency of the entire lens system. At the same time, maintaining the consistency of the Abbe number helps to mitigate the optical distortion caused by the lens shape and ensure the accuracy of the image.

[0069] In this embodiment, the matching design of the refractive index and the Abbe number of the second lens 240 helps to reduce the optical inhomogeneity and distortion in the lens system, and improves the imaging performance of the fluorescence camera mount. Such an optimized design enables the fluorescence camera mount to perform high-quality imaging more effectively in medical and scientific research applications.

[0070] In one embodiment, continue as Figure 1 A prism model 500 is also provided at one end of the band-stop filter 300 close to the image side; the refractive index value range of the prism model 500 is greater than the refractive index value range of the first lens 220, and the Abbe number value range of the prism model 500 is the same as the Abbe number value range of the first lens 220.

[0071] Specifically, in the structure of the fluorescent camera mount, a prism model 500 is further provided at one end of the band-stop filter 300 close to the image side. The design of the prism model 500 includes a refractive index value range greater than the refractive index value range of the first lens 220, and an Abbe number value range that is the same as that of the first lens 220.

[0072] During operation, the band-stop filter 300 is used to adjust the light passing through the endoscope, selectively blocking or transmitting light of a specific wavelength to improve the quality of imaging. A prism model 500 with a larger refractive index is provided at one end close to the image side. Such a design can guide the light and further adjust the optical path to ensure the clarity and accuracy of the imaging. At the same time, the Abbe number range of the prism model 500 matches the Abbe number range of the first lens 220 to mitigate the optical distortion caused by the lens shape.

[0073] In this embodiment, by introducing a prism model 500 at the end of the band-stop filter 300 close to the image side, the light is further adjusted, optical distortion is reduced, and the clarity and accuracy of imaging are improved. Such an optimized design enables the fluorescence camera mount to more effectively perform high-quality imaging in the fields of medicine and scientific research, and has important application value in capturing and imaging fluorescence signals.

[0074] In one embodiment, continue as Figure 1 The fluorescent camera mount is also provided with a rear protective sheet 400 between the band-stop filter 300 and the prism model 500; the refractive index value ranges of the front protective sheet 100, the band-stop filter 300 and the rear protective sheet 400 are all the same as the refractive index value range of the second lens 240; the Abbe number value ranges of the front protective sheet 100, the band-stop filter 300 and the rear protective sheet 400 are all between the Abbe number value range of the second image-side cemented lens 232 and the Abbe number value range of the first lens 220.

[0075] Specifically, in the structure of the fluorescent camera mount, in addition to the band-stop filter 300 and the prism model 500, a rear protective sheet 400 is also provided between the band-stop filter 300 and the prism model 500. In this design, the refractive index value ranges of the front protective sheet 100, the band-stop filter 300, and the rear protective sheet 400 are all the same as the refractive index value range of the second lens 240. At the same time, the Abbe number value ranges of these protective sheets are between the Abbe number value range of the second image-side cemented lens 232 and the Abbe number value range of the first lens 220.

[0076] During operation, the front protective sheet 100, the band-stop filter 300 and the rear protective sheet 400 jointly protect and regulate light. Their refractive index value range matches that of the second lens 240, ensuring the consistency of the optical system and the smooth transition of the optical path. In addition, the selection of their Abbe number value range enables the optical system to provide clear and precise imaging while avoiding optical distortion.

[0077] In this embodiment, by providing the front protective sheet 100, the band-stop filter 300 and the rear protective sheet 400, not only the internal optical components are protected, but also the optical performance is reasonably adjusted. This helps to improve the performance of the endoscope system in fluorescence imaging and provide a more reliable and efficient imaging tool for the medical and scientific research fields.

[0078] In one embodiment, continue as Figure 1 A detector surface 600 is also provided at one end of the prism model 500 close to the image side.

[0079] Specifically, in the design of the fluorescent camera mount, a detector surface 600 is also provided at one end of the prism model 500 close to the image side. This means that after the light passes through the band-stop filter 300 and the prism model 500, the detector surface 600 is located at the final position of the light path and is responsible for receiving and recording the light signal passing through the lens system.

[0080] During operation, the fluorescence signal is modulated by the front protective film 100, the optical lens group 200, the band-stop filter 300 and the prism model 500, and finally reaches the detector surface 600. The task of the detector surface 600 is to convert the optical signal into an electrical signal, and then form a digital image or other forms of output. This process enables the endoscope system to capture and record the fluorescence signal and realize the fluorescence imaging of the observed target.

[0081] In this embodiment, by setting the detector surface 600 at the end of the prism model 500 close to the image side, efficient detection and recording of the light signal is achieved. This configuration makes the endoscope system more flexible and accurate in fluorescence imaging applications, providing a high-quality fluorescence imaging tool for the medical and scientific research fields.

[0082] In one embodiment, continue as Figure 1 The first cemented lens 210 has a first surface facing the object side and a second surface facing the image side; the curvature radii of the first surface and the second surface are infinite.

[0083] Specifically, in the design of the fluorescent camera mount, the first cemented lens 210 has a specific structure: the side facing the object side is called the first surface, and the side facing the image side is the second surface. It is worth noting that the curvature radius of the first surface and the second surface are both set to be infinite.

[0084] During operation, this means that the surface curvature of the first cemented lens 210 is very flat, close to a plane. This special curvature radius setting can reduce or eliminate the optical distortion caused by the lens surface, and improve the transmission and focusing effect of light. Since the curvature radius is infinite, the lens surface is designed to be close to a plane, reducing distortions such as spherical aberration, which helps to improve the optical performance of the entire lens system.

[0085] In this embodiment, by setting the surface curvature radius of the first cemented lens 210 to be infinite, optical distortion can be reduced and the imaging quality of the lens system can be improved. The application of this design in the fields of medicine and scientific research, especially in endoscopic imaging, helps to obtain clearer and more accurate images.

[0086] In one embodiment, continue as Figure 1The first lens 220 has a third surface facing the object side, a fourth surface cemented to the object side, and a fifth surface facing the image side; the third surface has a curvature radius of 12.8 mm and is concave toward the image side, the fourth surface has a curvature radius of -18.8 mm and is convex toward the image side, and the fifth surface has a curvature radius of 8.9 mm and is concave toward the image side.

[0087] Specifically, the first lens 220 involves three different surfaces in its design: a third surface, a fourth surface, and a fifth surface. The third surface faces the object side, the fourth surface is a cemented surface, and the fifth surface faces the image side. During operation, the radius of curvature of the third surface is 12.8 mm, presenting a concave shape toward the image side; the radius of curvature of the fourth surface is -18.8 mm, presenting a convex shape toward the image side; and the radius of curvature of the fifth surface is 8.9 mm, also presenting a concave shape toward the image side. This design combines different curvature radii and shapes to achieve more precise light focusing and imaging by adjusting the optical properties of the lens.

[0088] In this embodiment, by comprehensively using surface designs with different curvature radii, the first lens 220 can effectively control the propagation and refraction of light and optimize the focal length and focusing effect of the lens system. This design helps to reduce optical distortion, improve image clarity and accuracy, and provide more superior optical performance for optical imaging systems such as fluorescent camera mounts.

[0089] In one embodiment, continue as Figure 1 The second cemented lens 230 has a sixth surface facing the object side and a seventh surface facing the image side; the sixth surface has a curvature radius of -7.3 mm and is convex to the image side, and the seventh surface has a curvature radius of -14 mm and is convex to the image side.

[0090] Specifically, the second cemented lens 230 includes two surfaces: the sixth surface faces the object side, and the seventh surface faces the image side. In the design, the radius of curvature of the sixth surface is -7.3mm, showing a convex shape toward the image side; and the radius of curvature of the seventh surface is -14mm, also showing a convex shape toward the image side. During operation, this design achieves precise modulation of light by adjusting the surface shape and radius of curvature of the lens. The convex design of the second cemented lens 230 helps to focus light and optimize the optical performance of the lens system. In addition, by using different radii of curvature on the object side and the image side, the refraction and scattering of the lens can be more effectively controlled, thereby improving the clarity and accuracy of imaging.

[0091] In this embodiment, the design of the second cemented lens 230 effectively optimizes the optical performance by appropriately selecting and configuring the curvature radius, which helps to reduce optical distortion, improve the imaging quality of the lens system, and provide more accurate and reliable optical performance for optical imaging systems such as fluorescent camera mounts.

[0092] In one embodiment, continue as Figure 1 The side of the second lens 240 facing the object side is the eighth surface, the cemented surface is the ninth surface, and the side facing the image side is the tenth surface; the curvature radius of the eighth surface is -30.7 mm and convex to the image side, the curvature radius of the ninth surface is 13.0 mm and concave to the image side, and the curvature radius of the tenth surface is -16.4 mm and convex to the image side.

[0093] Specifically, the second lens 240 is composed of three different surfaces, including the eighth surface facing the object side, the ninth surface of the bonding surface, and the tenth surface facing the image side. In this design, the radius of curvature of the eighth surface is -30.7mm, presenting a convex shape toward the image side; the radius of curvature of the ninth surface is 13.0mm, presenting a concave shape toward the image side; and the radius of curvature of the tenth surface is -16.4mm, also presenting a convex shape toward the image side. During operation, such a design enables the second lens 240 to precisely control the light. By adjusting the radius of curvature and shape of different surfaces, the second lens 240 achieves reasonable focusing and modulation of the light. The convex design of the eighth surface helps to focus the light, while the concave and convex shapes of the ninth and tenth surfaces further optimize the optical performance, enabling the lens system to provide clear and precise imaging effects.

[0094] In this embodiment, the design of the second lens 240 optimizes the optical performance by reasonably configuring the curvature radius and the surface shape, which helps to improve the imaging quality of the lens system, reduce optical distortion, and provide more efficient and reliable optical performance for optical imaging systems such as fluorescent camera mounts.

[0095] In a specific embodiment, the side of the front protective film 100 facing the object plane is defined as the first surface, and the side facing the image plane is defined as the second surface, the side of the first cemented lens 210 facing the object plane is defined as the third surface, the cemented surface is defined as the fourth surface, and the side facing the image plane is defined as the fifth surface, the side of the first lens 220 facing the object plane is defined as the sixth surface, and the side facing the image plane is defined as the seventh surface, the side of the second cemented lens facing the object plane is defined as the eighth surface, the cemented surface is defined as the ninth surface, and the side facing the image plane is defined as the tenth surface, and so on. Then: the first and second surfaces are planes with infinite curvature radius, the third surface is a concave image surface with a curvature radius equal to 12.8, the fourth surface is a convex image surface with a curvature radius equal to -18.8, the fifth surface is a concave image surface with a curvature radius equal to 8.9mm, the sixth surface is a convex image surface with a curvature radius equal to -7.3mm, the seventh surface is a convex image surface with a curvature radius equal to -14mm, the eighth surface is a convex image surface with a curvature radius equal to -30.7mm, the ninth surface is a concave image surface with a curvature radius equal to 13.0mm, and the tenth surface is a convex image surface with a curvature radius equal to -16.4mm. Furthermore, the refractive index of the first object-side cemented lens 211 is between 1.85 and 1.95, and the Abbe number is between 30 and 40; the refractive index of the first image-side cemented lens 212 is between 1.6 and 1.7, and the Abbe number is between 30 and 40; the refractive index of the first lens 220 is between 1.60 and 1.7, and the Abbe number is between 40 and 50; the refractive index of the second object-side cemented lens 231 is between 1.6 and 1.70, and the Abbe number is between 30 and 40; the refractive index of the second image-side cemented lens 232 is between 1.6 and 1.70, and the Abbe number is between 30 and 40; The refractive index of the side cemented lens 232 is between 1.5 and 1.60, and the Abbe number is between 70 and 80; the refractive index of the second lens 240 is between 1.50 and 1.6, and the Abbe number is between 70 and 80; the refractive index of the front protective sheet 100, the rear protective sheet 400, and the band-stop filter 300 is between 1.50 and 1.6, and the Abbe number is between 60 and 70; the refractive index of the prism model 500 is between 1.80 and 1.9, and the Abbe number is between 40 and 50. The curvature, lens thickness, material refractive index and Abbe number of the lens group are specifically shown in Table 1 below.

[0096] Table 1

[0097]

[0098]

[0099] Under this condition, the MTF curve between 0 and 200lp / mm is as follows Figure 2 As shown, at 200lp / mm, the MTF value is greater than 0.1. Figure 2The MTF curves corresponding to the meridian and sagittal planes at five different positions of the central field of view, 1mm field of view, 2mm field of view, 3mm field of view, and 4.4mm field of view at a frequency of 0-200lp / mm are given, and the MTF curve under the diffraction limit condition is given for comparison. Figure 2 It can be seen that the MTF approaches the diffraction limit.

[0100] like Figure 3 As shown, a spherical aberration curve is provided. Figure 3 In the spherical aberration curve diagram, the spherical aberration curve is shown by a solid line. Figure 4 As shown, a graph of astigmatism is provided. Figure 4 In the astigmatism curve diagram, the aberration in the meridian plane is shown by the solid line, and the aberration in the sagittal plane is shown by the dotted line. Figure 5 to Figure 6 As shown, a distortion curve diagram is provided. Figure 5 to Figure 6 In the distortion curve diagram, the solid line shows the distortion aberration of the system. Figures 3 to 6 It can be seen that the geometric radius of the diffuse spot designed for the fluorescent camera mount is all within the radius of the Airy disk, the aberration is small, the relative illumination is over 90%, the maximum meridian field curvature is 0.03mm, the maximum sagittal field curvature is 0.04mm, and the distortion is less than 2%.

[0101] In one embodiment, the endoscope system includes a fluorescence camera mount.

[0102] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0103] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

[0104] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0105] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0106] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0107] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0108] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0109] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A fluorescent camera mount, characterized in that: The fluorescent camera mount is provided with a front protective sheet (100), an optical lens group (200) and a filter assembly in sequence along the direction from the object side to the image side, and the plane where the filter assembly is located intersects with the plane where the front protective sheet (100) is located.

2. The fluorescent camera mount according to claim 1, characterized in that: The value range of the angle between the plane where the filter assembly is located and the plane where the front protective sheet (100) is located is greater than or equal to 12 degrees and less than or equal to 16 degrees.

3. The fluorescent camera mount according to claim 1, characterized in that: The filter component is a band-stop filter (300), or a filter film (700) attached to the lens closest to the image side in the optical lens group (200).

4. The fluorescent camera mount according to claim 3, characterized in that: The optical lens group (200) comprises, from the object side to the image side, a first cemented lens (210), a first lens (220), a second cemented lens (230), and a second lens (240).

5. The fluorescent camera mount according to claim 4, characterized in that: The first cemented lens (210) includes, from the object side to the image side, a first object side cemented lens (211) and a first image side cemented lens (212); a refractive index value range of the first object side cemented lens (211) is greater than a refractive index value range of the first image side cemented lens (212), and an Abbe number value range of the first object side cemented lens (211) is the same as an Abbe number value range of the first image side cemented lens (212).

6. The fluorescent camera mount according to claim 5, characterized in that: The refraction of the first lens (220) The range of refractive index values ​​is the same as the range of refractive index values ​​of the first image-side cemented lens (212), and the range of Abbe number values ​​of the first lens (220) is greater than the range of Abbe number values ​​of the first image-side cemented lens (212).

7. The fluorescent camera mount according to claim 6, characterized in that: The second cemented lens (230) includes, from the object side to the image side, a second object side cemented lens (213) and a second image side cemented lens (214); the refractive index value range of the second object side cemented lens (213) is the same as the refractive index value range of the first image side cemented lens (212), and the Abbe number value range of the second object side cemented lens (213) is the same as the Abbe number value range of the first image side cemented lens (212); the refractive index value range of the second image side cemented lens (214) is smaller than the refractive index value range of the second object side cemented lens (213), and the Abbe number value range of the second image side cemented lens (214) is larger than the Abbe number value range of the first lens (220).

8. The fluorescent camera mount according to claim 7, characterized in that: The refractive index value range of the second lens (240) is the same as the refractive index value range of the second image side cemented lens (214), and the Abbe number value range of the second lens (240) is the same as the Abbe number value range of the second image side cemented lens (214).

9. The fluorescent camera mount according to claim 8, characterized in that: A prism model (500) is also provided at one end of the band-stop filter (300) close to the image side; the refractive index value range of the prism model (500) is greater than the refractive index value range of the first lens (220), and the Abbe number value range of the prism model (500) is the same as the Abbe number value range of the first lens (220).

10. The fluorescent camera mount according to claim 9, characterized in that: The fluorescent camera mount is also provided with a rear protective plate (400) between the band-stop filter (300) and the prism model (500); the refractive index value ranges of the front protective plate (100), the band-stop filter (300) and the rear protective plate (400) are all the same as the refractive index value range of the second lens (240); the Abbe number value ranges of the front protective plate (100), the band-stop filter (300) and the rear protective plate (400) are all between the Abbe number value range of the second image-side cemented lens (214) and the Abbe number value range of the first lens (220).

11. The fluorescent camera mount according to claim 10, characterized in that: A detector surface (600) is also provided at one end of the prism model (500) close to the image side.

12. The fluorescent camera mount according to claim 4, characterized in that: The first cemented lens (210) has a first surface on its side facing the object side and a second surface on its side facing the image side; the curvature radii of the first surface and the second surface are infinite.

13. The fluorescent camera mount according to claim 4, characterized in that: The first lens (220) has a third surface facing the object side, a fourth surface cemented to the object side, and a fifth surface facing the image side. The third surface has a curvature radius of 12.8 mm and is concave toward the image side, the fourth surface has a curvature radius of -18.8 mm and is convex toward the image side, and the fifth surface has a curvature radius of 8.9 mm and is concave toward the image side.

14. The fluorescent camera mount according to claim 4, characterized in that: The side of the second cemented lens (230) facing the object side is the sixth surface, and the side facing the image side is the seventh surface; the curvature radius of the sixth surface is -7.3 mm and is convex toward the image side, and the curvature radius of the seventh surface is -14 mm and is convex toward the image side.

15. The fluorescent camera mount according to claim 4, characterized in that: The surface of the second lens (240) facing the object side is the eighth surface, the cemented surface is the ninth surface, and the surface facing the image side is the tenth surface; the curvature radius of the eighth surface is -30.7 mm and is convex toward the image side, the curvature radius of the ninth surface is 13.0 mm and is concave toward the image side, and the curvature radius of the tenth surface is -16.4 mm and is convex toward the image side.

16. An endoscope system, characterized in that: The endoscope system comprises the fluorescent camera mount according to any one of claims 1 to 15.

Images