An illumination assembly for an endoscope and a method of parameter determination of an illumination assembly

Abstract

The application relates to an illumination assembly for an endoscope and a parameter determination method of the illumination assembly. The illumination assembly comprises a cone part and a lens part which are integrally formed; the cone part comprises a large-diameter end and a small-diameter end; the light-out surface of the lens part comprises a total reflection surface and a refraction surface; the large-diameter end of the cone part is connected with the light-out surface of a light guide beam, and the small-diameter end of the cone part is connected with the lens part; the emergent light of the light guide beam is incident into the cone part from the large-diameter end, is converged and the beam angle is adjusted in the cone part, is then emitted from the small-diameter end, enters the lens part, and a part of the light beam incident into the lens part reaches the light-out port of the illumination assembly after total internal reflection on the total reflection surface, and another part reaches the light-out port of the illumination assembly after refraction on the refraction surface. The problems that the light cannot be considered in terms of uniform distribution and large-angle illumination in the coupling and transmission process of the existing endoscope illumination assembly are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of endoscopes, in particular to a lighting assembly for an endoscope and a parameter determination method of the lighting assembly. BACKGROUND

[0002] With the development of endoscope technology, endoscope technology has been widely used in the medical field. In actual application, in order to observe or operate by using an endoscope, a lighting assembly needs to be equipped in an electronic endoscope. By using the lighting assembly, the light distribution and angle of the light source are optimized.

[0003] The existing endoscope lighting assembly mainly uses a conical surface or a convex lens to realize the coupling of the light guide beam and the light at the end of the mirror. When a conical body is used to realize the coupling of the light guide beam and the light at the end of the mirror, in the process of transmitting the light from the light guide beam to the conical surface and entering the end of the mirror, due to the limited adjustment ability of the conical body to the light, the light is not uniformly distributed in the coupling and transmission process. Although the use of a convex lens can adjust the angle and focusing position of the light to a certain extent, it is limited by the refractive index of the lens and cannot realize large-angle illumination.

[0004] For the existing endoscope lighting assembly, the light cannot be uniformly distributed and large-angle illuminated in the coupling and transmission process, and there is currently no effective solution to this problem. SUMMARY

[0005] Therefore, it is necessary to provide a lighting assembly for an endoscope and a parameter determination method of the lighting assembly to solve the above technical problems.

[0006] In a first aspect, the present application provides a lighting assembly for an endoscope. The lighting assembly comprises a conical body and a lens part, and the conical body and the lens part are integrally formed.

[0007] The conical body comprises a large-diameter end and a small-diameter end; and the light exit surface of the lens part comprises a total reflection surface and a refraction surface.

[0008] The large-diameter end of the conical body is connected to the light exit surface of the light guide beam, and the small-diameter end of the conical body is connected to the lens part.

[0009] The exit light of the light guide beam is incident on the conical body from the large-diameter end, the light beam angle is adjusted after converging by the conical body, and then the light beam exits from the small-diameter end and enters the lens part. A part of the light beam incident on the lens part undergoes total internal reflection on the total reflection surface and reaches the light exit port of the lighting assembly, and another part of the light beam undergoes refraction on the refraction surface and reaches the light exit port of the lighting assembly.

[0010] In one of the embodiments, the material of the cone part and the lens part is optical glass.

[0011] In one of the embodiments, the side surface of the cone part is coated with aluminum film or silver film; the total reflection surface of the lens part is coated with aluminum film or silver film.

[0012] In one of the embodiments, the refractive surface of the lens part is coated with anti-reflection film.

[0013] In one of the embodiments, the lens part further comprises an inclined plane.

[0014] The inclined plane is used to deflect the outgoing light rays of the total reflection surface to the light outlet of the illumination assembly.

[0015] In one of the embodiments, the refractive surface and / or the total reflection surface of the lens part is provided with a microstructure layer.

[0016] The microstructure layer is a microlens array or a diffractive optical element.

[0017] In a second aspect, the application further provides a parameter determination method of an illumination assembly. The parameters of the illumination assembly for an endoscope in the first aspect are determined, the parameters of the cone part are determined, including:

[0018] Based on the radius of the large-diameter end and the radius of the small-diameter end of the cone part, and the preset angle threshold of the outgoing light rays at the small-diameter end of the cone part, the cone angle of the cone part is determined; the preset angle threshold is the minimum value of the included angle between the incident light rays of the reflection surface of the lens part and the central axis of the cone part when the angle of the incident light rays of the total reflection surface of the lens part is greater than or equal to the critical angle of total reflection.

[0019] In one of the embodiments, the parameters of the refractive surface of the lens part are determined, including:

[0020] Based on the light intensity distribution of the light rays incident on the refractive surface of the lens part after the preliminary adjustment, and the preset light outlet surface, the energy mapping relationship between the incident light rays of the refractive surface of the lens part and the light outlet surface is established;

[0021] Based on the energy mapping relationship between the incident light rays of the refractive surface of the lens part and the light outlet surface, and the preset first lens generatrix reference point, the coordinates and normal vectors of all points on the first free-form lens generatrix are obtained by using the Snell's law formula; the first free-form lens is the free-form lens corresponding to the refractive surface of the lens part.

[0022] Based on the coordinates and normal vectors of all points on the first free-form lens generatrix, the parameters of the refractive surface of the lens part are determined; the parameters include the radius of curvature, the conic constant, and the coordinates of each point.

[0023] In one embodiment, determining the parameters of the total reflection surface of the lens portion comprises:

[0024] Based on the light intensity distribution of the light rays entering the total reflection surface of the lens portion after the preliminary adjustment and the preset light outlet surface, an energy mapping relationship between the incident light rays of the total reflection surface of the lens portion and the light outlet surface is established.

[0025] Based on the energy mapping relationship between the incident light rays of the total reflection surface of the lens portion and the light outlet surface and the preset second lens generatrix reference point, coordinates and normal vectors of all points on a second free-form lens generatrix are obtained; the second free-form lens is a free-form lens corresponding to the total reflection surface of the lens portion.

[0026] Based on the coordinates and normal vectors of all points on the second free-form lens generatrix, the parameters of the total reflection surface of the lens portion are determined.

[0027] In one embodiment, before the energy mapping relationship between the incident light rays of the total reflection surface of the lens portion and the light outlet surface is established based on the light intensity distribution of the light rays entering the total reflection surface of the lens portion after the preliminary adjustment and the preset light outlet surface, the method comprises:

[0028] Based on the angle range requirement of the light outlet angle at the light outlet, the position of the light outlet surface is adjusted to obtain the position of the adjusted light outlet surface.

[0029] In a third aspect, the application also provides a parameter determination device of a lighting assembly. The device is used to implement the parameter determination method of the lighting assembly in the second aspect, and comprises:

[0030] A first parameter determination module is configured to determine a cone angle of the cone portion based on a radius of a large-diameter end and a radius of a small-diameter end of the cone portion and a preset angle threshold of the light rays exiting the small-diameter end of the cone portion.

[0031] A first mapping construction module is configured to establish an energy mapping relationship between the incident light rays of the refractive surface of the lens portion and the light outlet surface based on the light intensity distribution of the light rays entering the refractive surface of the lens portion after the preliminary adjustment and the preset light outlet surface.

[0032] A first coordinate determination module is configured to obtain coordinates and normal vectors of all points on a first free-form lens generatrix by using Snell's law formula based on the energy mapping relationship between the incident light rays of the refractive surface of the lens portion and the light outlet surface and a preset first lens generatrix reference point; the first free-form lens is a free-form lens corresponding to the refractive surface of the lens portion.

[0033] a second parameter determination module configured to determine parameters of the refractive surface of the lens portion based on the coordinates and normal vectors of all points on the second free-form lens generatrix; the parameters include a radius of curvature, a conic constant, and the coordinates of each point;

[0034] a second mapping construction module configured to establish an energy mapping relationship between the incident light rays of the total reflection surface of the lens portion and the light outlet surface based on the light intensity distribution of the total reflection surface of the lens portion after the preliminary adjustment and the preset light outlet surface;

[0035] a second coordinate determination module configured to obtain the coordinates and normal vectors of all points on a second free-form lens generatrix based on the energy mapping relationship between the incident light rays of the total reflection surface of the lens portion and the light outlet surface and the preset second lens generatrix reference point; the second free-form lens is a free-form lens corresponding to the total reflection surface of the lens portion;

[0036] a third parameter determination module configured to determine parameters of the total reflection surface of the lens portion based on the coordinates and normal vectors of all points on the second free-form lens generatrix.

[0037] In a fourth aspect, the present application further provides an endoscope system. The endoscope system integrates the illumination assembly for an endoscope according to the first aspect. The system further includes a light guide bundle, a light source host, and an endoscope; the endoscope includes an endoscope light inlet and an endoscope light outlet.

[0038] The light guide bundle is configured to transmit the light output by the light source host to the illumination assembly.

[0039] The endoscope light inlet is connected to the light outlet of the illumination assembly and is configured to receive the light emitted by the light outlet of the illumination assembly.

[0040] The endoscope is configured to transmit the light received by the endoscope light inlet to the endoscope light outlet through a light guide fiber in the endoscope to emit the light from the endoscope light outlet and observe a target area.

[0041] The illumination assembly for the endoscope comprises a taper part and a lens part which are integrally formed; the taper part comprises a large-diameter end and a small-diameter end; the light exit surface of the lens part comprises a total reflection surface and a refraction surface; the large-diameter end of the taper part is connected to the light exit surface of the light guide beam, and the small-diameter end of the taper part is connected to the lens part; the exit light of the light guide beam is incident into the taper part from the large-diameter end, converges and adjusts the beam angle in the taper part, and then is emitted from the small-diameter end and enters the lens part; part of the light beam incident into the lens part reaches the light exit port of the illumination assembly after total internal reflection on the total reflection surface, and the other part of the light beam reaches the light exit port of the illumination assembly after refraction on the refraction surface. The input light is converged and the angle is adjusted by the taper part, and then part of the light beam incident into the lens part is refracted by the refraction surface of the lens part and is uniformly output, and the other part of the light beam incident into the lens part is expanded in angle by the total reflection surface and is output, the taper part and the lens part designed based on the total internal reflection principle are combined, the synergistic effect of refraction and total reflection is utilized, the precise adjustment of the beam angle and the optimization of the light intensity distribution are realized. The problem that the light cannot be considered in terms of uniform distribution and wide-angle illumination in the coupling and transmission process of the existing endoscope illumination assembly is solved.

[0042] The details of one or more embodiments of the present application are presented in the following drawings and description to make other features, objects and advantages of the present application more apparent. BRIEF DESCRIPTION OF DRAWINGS

[0043] The drawings described herein are intended to provide further understanding of the present application, and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0044] Figure 1 is a structural schematic diagram of an illumination assembly for an endoscope provided by an embodiment of the present application;

[0045] Figure 2 is a schematic diagram of the transmission path of light in the illumination assembly provided by an embodiment of the present application;

[0046] Figure 3 is a hardware structure block diagram of a terminal of a parameter determination method of the illumination assembly provided by an embodiment of the present application;

[0047] Figure 4 is a schematic diagram of the end surface division result of a virtual light source provided by an embodiment of the present application;

[0048] Figure 5 is a schematic diagram of the mapping relationship between the light source and the target plane provided by an embodiment of the present application;

[0049] Figure 6 is a schematic diagram of the construction of the first free-form lens generatrix provided by an embodiment of the present application;

[0050] Figure 7 A virtual light emitting surface division diagram provided by an embodiment of the present application;

[0051] Figure 8 A lighting assembly diagram determined according to modeling of calculated parameters provided by an embodiment of the present application;

[0052] Figure 9 An angle correction effect diagram provided by an embodiment of the present application;

[0053] Figure 10 An incident light diagram of a lighting assembly provided by an embodiment of the present application;

[0054] Figure 11 An emergent light diagram of a lighting assembly provided by an embodiment of the present application;

[0055] Figure 12 A light distribution change diagram before and after optimization of a lighting assembly provided by an embodiment of the present application. DETAILED DESCRIPTION

[0056] In order to more clearly understand the purpose, technical solutions and advantages of the present application, the present application is described and explained below in conjunction with the accompanying drawings and embodiments.

[0057] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the general meaning understood by a person with ordinary skill in the art to which the present application belongs. In the present application, "one", "a", "an", "the", "these" and similar words do not represent a quantitative limitation, and they can be singular or plural. In the present application, the terms "include", "contain", "have" and any variants thereof have the purpose of covering non-exclusive inclusion; for example, a process, method and system, product or device containing a series of steps or modules (units) are not limited to the listed steps or modules (units), but can include steps or modules (units) not listed, or can include other steps or modules (units) inherent to the process, method, product or device. In the present application, the terms "connected", "connected", "coupled" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. In the present application, "multiple" means two or more. The association between the associated objects is described by the term "and / or", which means that there can be three relationships, for example, "A and / or B" can mean that A exists alone, A and B exist together, and B exists alone. In general, the character " / " represents an "or" relationship between the objects before and after. In the present application, the terms "first", "second", "third" and the like are only used to distinguish similar objects, and do not represent a specific order of the objects.

[0058] In the present embodiment, an illumination assembly for an endoscope is provided. Figure 1 is a structural schematic diagram of an illumination assembly for an endoscope according to the present embodiment. As shown in the figure, the illumination assembly comprises a cone part 110 and a lens part 120, which are integrally formed; the cone part 110 comprises a large-diameter end and a small-diameter end; the light-out surface of the lens part 120 comprises a total reflection surface 122 and a refraction surface 124; the large-diameter end of the cone part 110 is connected to the light-out surface of a light guide, and the small-diameter end of the cone part 110 is connected to the lens part 120; the emergent light of the light guide is incident to the cone part 110 from the large-diameter end, is converged and adjusted in angle by the cone part 110, is then emitted from the small-diameter end, enters the lens part 120, and a part of the light beam incident to the lens part 120 reaches the light-out port of the illumination assembly after total internal reflection at the total reflection surface 122, and another part reaches the light-out port of the illumination assembly after refraction at the refraction surface 124. Figure 1

[0059] The above-mentioned cone part 110 is a three-dimensional part of a truncated cone structure. The above-mentioned cone part 110 is used to preliminarily converge and adjust the light rays output by the light guide. As shown in the figure, Figure 1 ​As shown, the small-diameter end of the cone portion 110 directly transitions to the total reflection surface 122 of the lens portion 120. The refractive surface 124 of the lens portion 120 adopts a free-form surface design. In the present embodiment, the outgoing light of the light beam is incident on the cone portion 110 from the large-diameter end, is totally reflected via the side surface of the cone portion 110, converges and adjusts the beam angle of the light, and then the adjusted light enters the lens portion 120 from the small-diameter end, and a part of the light beam incident on the lens portion 120 reaches the light outlet of the illumination assembly after total internal reflection at the total reflection surface 122, and another part reaches the light outlet of the illumination assembly after refraction at the refractive surface 124. This process uses the coordination of refraction and total reflection to adjust the angle and intensity distribution of the light, and realizes the optimization of beam expansion and uniform illumination. The matching of the parameters (such as the radius of curvature, the angle, etc.) between the refractive surface 124 and the total reflection surface 122 is the key to the coordination of refraction and total reflection. The total reflection surface 122 of the lens portion 120 is designed based on the principle of total internal reflection, and the angle and shape of the total reflection surface 122 are designed to ensure that the light is totally internally reflected in the lens portion 120. Specifically, the angle and shape of the total reflection surface 122 and the refractive surface 124 of the lens portion 120 can be adjusted to realize the optimization of beam expansion and uniform illumination, and the outgoing angle of the expanded light can reach 180° at most. Based on this, the lens portion 120 can effectively solve the problem of uneven light distribution in the prior art through the coordination of the refractive surface 124 and the total reflection surface 122, significantly improve the uniformity of endoscope illumination, and enable users to obtain clearer and more accurate visual information.

[0060] In one embodiment, the materials of the cone portion 110 and the lens portion 120 are both optical glass.

[0061] In the design process of the illumination assembly for an endoscope, the selection of materials is crucial to performance. Therefore, the materials of the cone portion 110 and the lens portion 120 can be selected as optical glass with high refractive index and low dispersion, such as N-BK7 (refractive index 1.517, Abbe number 64.2) or N-SF11 (refractive index 1.785, Abbe number 26.0), to enhance light control ability and reduce chromatic aberration. It should be noted that the materials of the optical glass are not specifically limited in the present embodiment, as long as they have the characteristics of high refractive index and low dispersion.

[0062] Specifically, in one embodiment, the side surface of the cone portion 110 is coated with an aluminum film or a silver film; the total reflection surface 122 of the lens portion 120 is coated with an aluminum film or a silver film; and / or the refractive surface 124 of the lens portion 120 is coated with an antireflection film.

[0063] Since the lighting assembly is a solid component, the cone portion or the lens is not coated, and the outer surface is coated. The side surface of the cone portion 110 is coated with aluminum film or silver film, and the total reflection surface 122 of the lens portion 120 is coated with aluminum film or silver film, both of which are used to improve the reflection efficiency. The anti-reflection film is used to reduce reflection loss and improve light energy utilization. It should be noted that the material of the anti-reflection film is not limited in this embodiment, as long as it can reduce reflection loss and improve light energy utilization. For example, the material of the anti-reflection film can be MgF2.

[0064] In addition, referring to Figure 1 In one embodiment, the lens portion 120 further includes an inclined plane 126, which is used to deflect the light rays emitted from the total reflection surface 122 to the light outlet of the lighting assembly.

[0065] The one end of the inclined plane 126 is connected to the light outlet edge of the total reflection surface 122, and the other end of the inclined plane 126 is connected to the lateral boundary of the refractive surface 124. The lateral boundary of the refractive surface 124 is the outermost edge profile of the refractive surface 124 in the radial direction.

[0066] Figure 2 The transmission path of light in the lighting assembly is provided for an embodiment of the present application. As Figure 2 shown, the light emitted from the large aperture end is incident on the cone portion 110, and a part of the light rays is directly incident on the lens portion 120 through the cone portion 110. Another part of the light rays will undergo one or more times of total reflection in the cone portion 110 and then be incident on the lens portion 120. A part of the light rays incident on the lens portion 120 will be refracted through the refractive surface 124 of the lens portion 120 and then reach the light outlet of the lighting assembly. Another part of the light rays incident on the lens portion 120 will be reflected through the total reflection surface 122 of the lens portion 120 and then be deflected through the inclined plane 126 to reach the light outlet of the lighting assembly. Figure 2 The transmission direction of the light rays is indicated by arrows.

[0067] In one embodiment, the refractive surface 124 and / or the total reflection surface 122 of the lens portion 120 are provided with a microstructure layer. The microstructure layer is a microlens array or a diffractive optical element.

[0068] The microstructure layer is a micron-level physical structure layer processed on the inner surface of the refractive surface 124 and / or the total reflection surface 122 of the lens portion 120, which is realized by precise carving technology or photolithography technology.

[0069] The microlens array can be a two-dimensional optical structure layer composed of a large number of microlenses arranged in a regular pattern, and can be presented in the form of a pattern. The microlens array can subdivide incident light into a plurality of small beams, and each microlens can focus or diverge the light, thereby achieving uniformization of the light intensity distribution on a macroscopic scale. Adding a microlens array to the refractive surface 124 of the lens portion 120 can further optimize the superposition of light rays, and adding a microlens pattern to the total reflection surface 122 can also better superimpose light rays.

[0070] The diffractive optical element can be an optical device that precisely manipulates the phase of light waves through a surface micro-nano structure. The diffractive optical element is an element that controls light waves based on the principle of light diffraction. The specific control process can be to modulate the phase of the incident light wave front by using a microstructure (such as a grating or a phase step), and to reconstruct the outgoing light field distribution.

[0071] The method embodiments provided in the present embodiment can be executed in a terminal, a computer, or a similar computing device. For example, the method embodiments can be run on a terminal, Figure 3 is a hardware structure block diagram of a terminal of a parameter determination method of a lighting assembly of the present embodiment. As shown in Figure 3 , the terminal can include one or more (only one is shown in Figure 3 ) processors 302 and a memory 304 for storing data, wherein the processor 302 can include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA. The terminal can further include a transmission device 306 for communication function and an input / output device 308. Those skilled in the art can understand that Figure 3 the structure shown is only schematic, and it does not limit the structure of the terminal. For example, the terminal can include more or fewer components than those shown in Figure 3 , or have a different configuration from that shown in Figure 3 .

[0072] The memory 304 can be used to store computer programs, such as software programs of application software and modules, such as a computer program corresponding to the parameter determination method of the lighting assembly in the present embodiment. The processor 302 executes various function applications and data processing by running the computer programs stored in the memory 304, i.e., implements the above method. The memory 304 can include a high-speed random access memory, and can further include a non-volatile memory, such as one or more magnetic storage devices, a flash memory, or other non-volatile solid-state memories. In some examples, the memory 304 can further include a memory remotely disposed relative to the processor 302, which can be connected to the terminal through a network. Examples of the network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0073] The transmission device 306 is configured to receive or send data via a network. The network includes a wireless network provided by a communication provider of the terminal. In an example, the transmission device 306 includes a network interface controller (NIC) which is configured to connect to other network devices through a base station so as to communicate with the Internet. In an example, the transmission device 306 can be a radio frequency (RF) module which is configured to communicate with the Internet in a wireless manner.

[0074] In the embodiment, a parameter determination method of the lighting assembly is provided. The parameter determination method of the cone part 110 of the lighting assembly includes the following steps:

[0075] In step S1, the cone angle of the cone part 110 is determined based on the radius of the large-diameter end and the radius of the small-diameter end of the cone part 110 and a preset angle threshold of the light ray emitted by the cone part 110 at the small-diameter end. The preset angle threshold is the minimum value of the angle between the incident light ray of the total reflection surface 122 of the lens part 120 and the central axis of the cone part 110 when the angle of the light ray incident on the total reflection surface 122 of the lens part 120 is greater than or equal to the critical angle of total reflection.

[0076] When the light ray is incident on the total reflection surface 122 at an inappropriate angle, some light rays cannot be totally internally reflected on the total reflection surface 122, resulting in light leakage or failure to achieve the expected beam expansion effect. In order to ensure that the light ray entering the total reflection surface 122 of the lens part 120 can be totally reflected, the cone angle of the cone part 110 and the parameters of the total reflection surface 122 of the lens part 120 need to be designed so that the angle of the light ray incident on the total reflection surface 122 is greater than the critical angle of total reflection. The above-mentioned critical angle of total reflection is the minimum incident angle of the total reflection surface 122 of the lens part 120. When the cone part 110 is designed, generally, the large-diameter end of the cone part 110 is connected with the light guide beam, so the size of the large-diameter end is related to the size of the outlet of the light guide beam, and the radius of the large-diameter end is fixed. The small-diameter end is connected with the lens part 120, and in order to facilitate design, the radius of the small-diameter end can be fixed, and only the cone angle of the cone part 110 is adjusted. The above-mentioned cone angle of the cone part 110 is the vertex angle of the original complete cone corresponding to the cone part 110.

[0077] The above-mentioned process of determining the cone angle of the cone part 110 based on the radius of the large-diameter end and the radius of the small-diameter end of the cone part 110 and the preset angle threshold of the light ray emitted by the cone part 110 at the small-diameter end can be represented by the following formula:

[0078] ;

[0079] wherein θ is the taper angle of the taper portion 110, R1 is the radius of the large-diameter end of the taper portion 110, R2 is the radius of the small-diameter end of the taper portion 110, is a preset angle threshold.

[0080] wherein in one embodiment, the parameter determination method of the refractive surface 124 of the lens portion 120 of the illumination assembly comprises the following steps:

[0081] Step S2, based on the light intensity distribution of the light rays entering the refractive surface 124 of the lens portion 120 after the preliminary adjustment, and the preset light outlet surface, an energy mapping relationship between the incident light rays of the refractive surface 124 of the lens portion 120 and the light outlet surface is established.

[0082] The light outlet surface can be the plane where the light outlet of the illumination assembly is located. In the present embodiment, the light outlet surface can be the surface or interface from which the light rays are emitted from the light outlet, i.e. the outlet plane through which the light energy propagates from the interior of the illumination assembly to the external environment.

[0083] wherein the establishment of the energy mapping relationship between the incident light rays of the refractive surface 124 of the lens portion 120 and the light outlet surface requires first dividing the incident light energy, then equally dividing the light outlet surface, and finally based on the incident light energy division result and the equally divided result of the light outlet surface, establishing the energy mapping relationship between the light source and the target plane. The specific process is as follows:

[0084] When the light rays enter the taper portion 110, after converging and adjusting the beam angle by the taper portion 110, it can be considered that the light rays form a virtual light emitting surface with certain uniformity and light emitting size at the plane where the small-diameter end of the taper portion 110 is located. This virtual light emitting surface can be used to divide the energy of the light incident to the lens portion 120. In the present embodiment, the incident light rays are taken as Gaussian light intensity as an example to determine the light intensity distribution of the virtual light emitting surface (which can be referred to as virtual light source) and the cross section of the small-diameter end as follows:

[0085] ;

[0086] wherein r is the radial distance from the optical axis center to the field point, z is the position coordinate of the waist of the virtual light emitting surface on the optical axis, is the waist width of the virtual light emitting surface, is the amplitude of the electromagnetic wave reduced to the axial , and the light intensity reduced to the axial point of the virtual light emitting surface corresponding to the radius, e is the base of natural logarithm, I0 is the central light intensity.

[0087] z is the position coordinate of the waist of the virtual light-emitting surface on the optical axis, and z=0. The light intensity distribution of the virtual light-emitting surface and the cross section of the small-diameter end is:

[0088] ;

[0089] The total energy of the light beam incident to the lens portion 120 is:

[0090] ;

[0091] Since the light intensity distribution on the cross section of the waist of the light source beam is the same for any radius, a rectangular coordinate system is established with the center of the cross section (the center of the virtual light-emitting surface and the cross section of the small-diameter end) as the origin and any radius on the cross section as the X axis. The light rays incident to the positive direction of the X axis are divided into N parts according to equal energy, and the energy of each part of the incident light beam in the X axis direction is :

[0092] ;

[0093] Solving the above formula, the horizontal coordinate of the radius of each equal-energy annulus of the light source in the X axis direction is obtained , where i=1, 2, …, N+1.

[0094] It should be noted that the number N can be set according to specific requirements. In order to ensure more accurate calculation parameters, N should be large enough. However, the increase of N will increase the amount of calculation and consume more computing resources. Therefore, N should be set to a suitable value. In addition, the light source in this embodiment is taken as an example of Gaussian light intensity. If the light source is different and the light intensity distribution of the light source is different, as long as the light energy can be divided according to the light intensity distribution, the type of the light source is not limited in this embodiment.

[0095] Figure 4 is a schematic diagram of the virtual light source end face division result provided in this embodiment. As shown in Figure 4 , the virtual light source end face is divided into a plurality of equal-energy annuli with the center of the cross section of the virtual light source as the center O.

[0096] In addition, after the light rays pass through the refracting surface 124 of the lens portion 120, they are output from the light output port. The target plane (which can be referred to as the target plane) is divided into equal areas.

[0097] Let the area of each unit on the target plane be , and the distance from the light source to the target plane be H. The boundary radius of the target plane is R. Let the radius of each annulus be (i=1, 2, …, N+1), where is the radius of the center point of the circular target plane, and .

[0098] Therefore, the area of each annular area unit is :

[0099] ;

[0100] The iterative relationship is obtained:

[0101] ;

[0102] Thus, the radius of each annular ring is , and the target plane has been divided into N annular units by equal area.

[0103] Further, the energy mapping relationship between the light source and the target plane is established.

[0104] According to the edge ray theory, when all the edge rays of the light beam are incident on the corresponding edge of the curved surface, all the rays in the light beam will be incident in the curved surface. Therefore, if we want to achieve uniform circular spot illumination, we need to ensure that the edge rays of the light source energy unit are mapped to the edge positions of the corresponding target plane area unit, so that the same energy is incident in each equal-area annular ring, thereby achieving uniform circular spot illumination.

[0105] According to the above principle, in order to obtain a uniform and required angle circular spot, on the X-axis of the light source cross section, the radius of the annular boundary is and The light rays on the annular boundary are refracted or reflected by the free curved surface, and are one-to-one refracted or reflected to the target plane annular boundary with a radius of and , thus establishing the energy mapping relationship between the light source and the target plane.

[0106] Figure 5 The mapping relationship between the light source and the target plane provided by the present embodiment is shown in the figure. As Figure 5 shown, the annular ring represented by the shadow of the above light source corresponds to the annular ring represented by the shadow of the target plane.

[0107] Step S3, based on the energy mapping relationship between the incident light rays of the refracting surface 124 of the lens part 120 and the light outlet surface, and the preset first lens generatrix reference point, the coordinates and normal vectors of all points on the first free curved surface lens generatrix are obtained by using the Snell's law formula; the first free curved surface lens is the free curved surface lens corresponding to the refracting surface 124 of the lens part 120.

[0108] The process of obtaining the coordinates and normal vectors of all points on the generatrix of the first freeform surface lens using Snell's law formula, based on the energy mapping relationship between the incident light ray and the light exit surface of the lens section 120 and the preset first lens generatrix reference point, is as follows:

[0109] Since both the light source and the target plane are divided into N equal parts, and the number of parts is sufficiently large, it can be approximated that two adjacent points on the reflecting surface of the lens 120 lie on the same tangent plane. Based on this geometric approximation, when a point on the lens is solved, it can be approximated that the next point also lies on the tangent plane of that point.

[0110] The vector form of Snell's law is:

[0111] ;

[0112] in, Let be the unit direction vector of the incident ray. Let be the unit direction vector of the outgoing ray. Let P be the unit normal vector of the freeform surface. and Let n0 be the refractive index of the medium in which the lens is located and the refractive index of the freeform lens material, respectively. In the design, since the refractive index of air is approximately 1, we take n0 = 1, and the Snell's law formula becomes:

[0113] ;

[0114] When the preset first lens generatrix reference point (lens vertex) is Based on the above Snell's law formula, the generatrix of the first freeform lens can be obtained. The coordinates and normal vectors of all points on the surface.

[0115] Figure 6 This is a schematic diagram illustrating the construction of the generatrix of the first freeform surface lens provided in this embodiment. Figure 6 As shown, the target surface mentioned above is the target plane, P i+1 Denotes the generatrix of the first freeform surface lens The (i+1)th point, Denotes the generatrix of the first freeform surface lens The normal vector at the (i+1)th point, Q i+1 (r) i+1 h) represents point r on the target surface i+1 The coordinates of the location.

[0116] Step S4: Based on the coordinates and normal vectors of all points on the generatrix of the first freeform lens, determine the parameters of the refractive surface 124 of the lens section 120; the parameters include the radius of curvature, the conic constant, and the coordinates of each point.

[0117] After the coordinates and normal vectors of all points on the first free-form lens generatrix are determined, the coordinates and normal vector data of all points on the first free-form lens generatrix need to be imported into the three-dimensional modeling software Rhinoceros, and then all the points are connected to form a B-spline curve, that is, the curve of the first free-form lens generatrix (free-form lens generatrix). Finally, the first free-form lens generatrix is rotated around the Z axis to form the refractive surface 124 of the lens portion 120.

[0118] Because the refractive surface 124 of the lens portion 120 is a free-form surface, it can be represented by an aspheric surface formula, and the representation formula of the refractive surface 124 of the lens portion 120 is:

[0119] ;

[0120] Where c is the curvature of the aspheric surface, 1 / R is the reciprocal of the radius of curvature, K is the conic constant of the aspheric surface, B1, B2, and B3 are the coefficients of the multiple terms, respectively.

[0121] Further, the coordinates of the plurality of points of the refractive surface 124 of the lens portion 120 obtained are substituted into the representation formula of the refractive surface 124 of the lens portion 120 to obtain the parameters of the refractive surface 124 of the lens portion 120 such as the radius of curvature and the conic constant of the aspheric surface.

[0122] The steps S2 to S4 above establish the energy mapping relationship between the incident light of the refractive surface 124 of the lens portion 120 and the light outlet surface based on the light intensity distribution of the light incident on the refractive surface 124 of the lens portion 120 after the preliminary adjustment and the preset light outlet surface, and then the coordinates and normal vectors of all points on the first free-form lens generatrix are obtained based on the energy mapping relationship between the incident light of the refractive surface 124 of the lens portion 120 and the light outlet surface and the preset first lens generatrix reference point, using the Snell's law formula. The parameters of the refractive surface 124 of the lens portion 120 are determined based on the coordinates and normal vectors of all points on the first free-form lens generatrix. Through the determination of the parameters of the refractive surface 124 of the lens portion 120, the refractive surface 124 of the lens portion 120 is constructed, and the design of the cone portion 110 and the lens portion 120 is realized. The synergistic effect of refraction and total reflection is utilized to realize the accurate adjustment of the beam angle and the optimization of the light intensity distribution, thereby significantly improving the uniformity of the endoscope illumination and the field quality.

[0123] Specifically, in one embodiment, the parameter determination method flow of the total reflection surface 122 of the lens portion 120 of the illumination assembly includes the following steps:

[0124] Step S5, based on the light intensity distribution of the light rays entering the total reflection surface 122 of the lens portion 120 after the preliminary adjustment, and the preset light outlet surface, an energy mapping relationship between the incident light rays of the total reflection surface 122 of the lens portion 120 and the light outlet surface is established.

[0125] Figure 7 A division schematic diagram of the virtual light emitting surface provided for the embodiment is shown. As shown, the virtual light emitting surface is divided into a middle region and a peripheral region, the middle region (black region) of the virtual light emitting surface is used for designing the refractive surface 124 of the lens portion 120, and the peripheral region (blue region) of the virtual light emitting surface is used for designing the total reflection surface 122 of the lens portion 120. Figure 7 Figure 7 Figure 7 The design of the peripheral region total reflection surface 122 is mainly to overcome the inability of refraction to meet the large-angle light supplement requirement, because an angle greater than the total reflection angle will result in reflection instead of refraction. The embodiment can use the same method as step S2 to construct the energy mapping relationship between the incident light rays of the total reflection surface 122 of the lens portion 120 and the light outlet surface.

[0126] Step S6, based on the energy mapping relationship between the incident light rays of the total reflection surface 122 of the lens portion 120 and the light outlet surface, and the preset second lens generatrix reference point, the coordinates and normal vectors of all points on the second free-form lens generatrix are obtained; the second free-form lens is the free-form lens corresponding to the total reflection surface 122 of the lens portion 120.

[0127] Because the light source and the target plane are both divided into N parts, and the number of parts is sufficient, it can be approximately considered that two adjacent points on the total reflection surface of the lens portion 120 are in the same tangent plane. Based on this geometric approximation idea, when a certain point on the lens is solved, it can be approximately considered that the next point is also located in the tangent plane of the point.

[0128] The reflection vector law formula is:

[0129] ;

[0130] wherein, is the unit direction vector of the incident light rays, is the unit direction vector of the outgoing light rays, and N 11 is the unit normal vector of the P point on the free-form surface.

[0131] When the preset second lens generatrix reference point (lens vertex) is , based on the above reflection vector law formula, the coordinates and normal vectors of all points on the second free-form lens generatrix D m can be obtained.

[0132] ​​It should be noted that when the light is reflected by the total reflection surface 122, it needs to be deflected by the inclined plane 126 to reach the light outlet surface. Therefore, the unit direction vector of the outgoing light in the reflection vector law formula needs to be modified in the process of obtaining the coordinates and normal vectors of all points on the second free-form lens generatrix D m In the process of obtaining the coordinates and normal vectors of all points on the above free-form lens generatrix, the unit direction vector of the outgoing light in the reflection vector law formula needs to be modified. The specific modification parameters are determined by the material of the inclined plane 126, which is not limited in the embodiment.

[0133] Step S7, based on the coordinates and normal vectors of all points on the second free-form lens generatrix, the parameters of the total reflection surface 122 of the lens part 120 are determined.

[0134] After the coordinates and normal vectors of all points on the second free-form lens generatrix are determined, the coordinates and normal vector data of all points on the second free-form lens generatrix need to be imported into the three-dimensional modeling software Rhinoceros, and then all points are connected to a B-spline curve, that is, the curve of the second free-form lens generatrix (free-form lens generatrix). Finally, the second free-form lens generatrix is rotated around the Z axis to form the total reflection surface 122 of the lens part 120.

[0135] Because the total reflection surface 122 of the lens part 120 is a free-form surface, it can be represented by an aspheric surface formula.

[0136] Further, the coordinates of the plurality of points of the total reflection surface 122 of the lens part 120 obtained are substituted into the aspheric surface formula to obtain the parameters of the total reflection surface 122 of the lens part 120, such as the radius of curvature and the conical constant of the aspheric surface.

[0137] The above steps S5 to S7 establish the energy mapping relationship between the incident light of the total reflection surface 122 of the lens part 120 and the light outlet surface based on the light intensity distribution of the light incident on the total reflection surface 122 of the lens part 120 after the preliminary adjustment and the preset light outlet surface. Further, based on the energy mapping relationship between the incident light of the total reflection surface 122 of the lens part 120 and the light outlet surface and the preset second lens generatrix reference point, the coordinates and normal vectors of all points on the second free-form lens generatrix are obtained. Finally, based on the coordinates and normal vectors of all points on the second free-form lens generatrix, the parameters of the total reflection surface 122 of the lens part 120 are determined. Through the determination of the parameters of the total reflection surface 122 of the lens part 120, the total reflection surface 122 of the lens part 120 is constructed, and the design of the cone part 110 and the lens part 120 is realized. The synergistic effect of refraction and total reflection is realized to achieve accurate adjustment of the light beam angle and optimization of the light intensity distribution, thereby significantly improving the uniformity of the endoscope illumination and the field quality.

[0138] In addition, in one embodiment, before step S5, it includes:

[0139] Step S4.8, adjusting the position of the light outlet face based on the angle range requirement of the light outlet angle at the light outlet, to obtain the adjusted position of the light outlet face.

[0140] It should be noted that when the angle range requirement of the light outlet angle at the light outlet changes, the position of the light outlet face can be adjusted, that is, the unit directional vector of the outgoing light is changed, the energy mapping relationship between the incident light of the total reflection surface 122 of the lens portion 120 and the light outlet face is changed by changing the unit directional vector of the outgoing light, so as to realize the angle expansion requirement of the light outlet face of the illumination assembly, and then realize the angle expansion requirement of the light outlet face of the endoscope.

[0141] In one specific embodiment, 6mm (diameter of the large aperture end of the cone portion) light spot is coupled to 2mm (diameter of the light outlet), while angle expansion and uniform light are performed.

[0142] Using the specific process of steps S1 to S7, the parameters of the optical assembly are designed, and the coordinates of the multiple points of the refractive surface 124 of the lens portion 120 are substituted into the expression formula of the refractive surface 124 of the lens portion 120 to obtain the parameters of the refractive surface 124 of the lens portion 120 such as the radius of curvature and the conic constant, which are shown in Table 1.

[0143] Table 1

[0144]

[0145] The coordinates of the multiple points of the total reflection surface 122 of the lens portion 120 are substituted into the expression formula of the total reflection surface 122 of the lens portion 120 to obtain the parameters of the refractive surface 124 of the lens portion 120 such as the radius of curvature and the conic constant, which are shown in Table 2.

[0146] Table 2

[0147]

[0148] Figure 8 The schematic diagram of the illumination assembly determined according to the modeling of the calculated parameters is provided for this embodiment. As shown in Figure 8 The distance between the plane where the large aperture end of the cone portion is located and the light outlet face is 10mm. Figure 9 The angle correction effect schematic diagram is provided for this embodiment. As shown in Figure 9 The incident light angle is expanded from 30 degrees to 160 degrees (light outlet angle), which can realize large-angle light compensation. Figure 10 The incident light schematic diagram of the illumination assembly is provided for this embodiment. Figure 11 The outgoing light schematic diagram of the illumination assembly is provided for this embodiment. As shown in Figure 11It can be seen that the uniformity of the outgoing light is also well optimized after the angle is expanded, and the center is obviously optimized from the previous obvious over-brightness to the flat transition to the edge. Figure 12 The schematic diagram of the light distribution change before and after the optimization of the lighting assembly is provided for the embodiment. As shown in the figure, Figure 12 The center over-brightness problem of the light is obviously optimized through the optimization of the lighting assembly, which is beneficial to the exposure processing of the image.

[0149] The diameter of the large-diameter end of the cone part of the above-mentioned example (i.e. the diameter of the surface of the light entering the lighting assembly) is 6mm, and the diameter of the light exit surface is 2mm. It should be noted that the diameter of the surface of the light entering the lighting assembly, and the diameter of the light exit surface, can also be specifically set according to specific needs, which is not specifically limited in the embodiment.

[0150] It should be understood that although each step in the flowchart involved in each embodiment as described above is displayed in sequence according to the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other orders. Moreover, at least part of the steps in the flowchart involved in each embodiment as described above can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or steps or stages in other steps.

[0151] Based on the same inventive concept, in the embodiment, a parameter determination device of a lighting assembly is also provided, which is used to realize the above-mentioned embodiments and preferred embodiments, and the description of which will not be repeated. The terms "module", "unit", "sub-unit" and the like used below can be a combination of software and / or hardware that realizes the predetermined function. Although the device described in the following embodiments is preferably realized in software, the realization of hardware, or a combination of software and hardware, is also possible and conceived.

[0152] In one embodiment, the parameter determination device of the lighting assembly provided by an embodiment of the present application comprises:

[0153] The first parameter determination module is configured to determine the cone angle of the cone part 110 based on the radius of the large-diameter end and the radius of the small-diameter end of the cone part 110, and the preset angle threshold of the outgoing light at the small-diameter end of the cone part 110.

[0154] The first mapping construction module is configured to establish an energy mapping relationship between the incident light rays of the refractive surface 124 of the lens portion 120 and the light outlet surface based on the preliminary adjusted light intensity distribution of the light rays entering the refractive surface 124 of the lens portion 120 and the preset light outlet surface.

[0155] The first coordinate determination module is configured to obtain the coordinates and normal vectors of all points on the first free-form lens generatrix based on the energy mapping relationship between the incident light rays of the refractive surface 124 of the lens portion 120 and the light outlet surface and the preset first lens generatrix reference point by using the Snell's law formula. The first free-form lens is a free-form lens corresponding to the refractive surface 124 of the lens portion 120.

[0156] The second parameter determination module is configured to determine the parameters of the refractive surface 124 of the lens portion 120 based on the coordinates and normal vectors of all points on the first free-form lens generatrix. The parameters include the radius of curvature, the conic constant and the coordinates of each point.

[0157] The second mapping construction module is configured to establish an energy mapping relationship between the incident light rays of the total reflection surface 122 of the lens portion 120 and the light outlet surface based on the preliminary adjusted light intensity distribution of the light rays entering the total reflection surface 122 of the lens portion 120 and the preset light outlet surface.

[0158] The second coordinate determination module is configured to obtain the coordinates and normal vectors of all points on the second free-form lens generatrix based on the energy mapping relationship between the incident light rays of the total reflection surface 122 of the lens portion 120 and the light outlet surface and the preset second lens generatrix reference point. The second free-form lens is a free-form lens corresponding to the total reflection surface 122 of the lens portion 120.

[0159] The third parameter determination module is configured to determine the parameters of the total reflection surface 122 of the lens portion 120 based on the coordinates and normal vectors of all points on the second free-form lens generatrix.

[0160] The parameter determination device of the above-mentioned illumination assembly determines the parameters of the total reflection surface 122 of the lens portion 120, constructs the total reflection surface 122 of the lens portion 120, and further realizes the design of the cone portion 110 and the lens portion 120. The synergistic effect of refraction and total reflection is utilized to realize the accurate adjustment of the light beam angle and the optimization of the light intensity distribution, thereby significantly improving the uniformity of the endoscope illumination and the field quality.

[0161] It should be noted that each of the above-mentioned modules can be a functional module or a program module, which can be implemented by software or hardware. For the modules implemented by hardware, each of the above-mentioned modules can be located in the same processor; or each of the above-mentioned modules can be located in different processors in any combination.

[0162] In one embodiment, an endoscope system is provided, the system is integrated with any one of the above-mentioned embodiments of the illumination assembly for an endoscope, the system further comprises: a light guide and an endoscope; the endoscope comprises an entrance port of the endoscope and an exit port of the endoscope; the light guide is configured to transmit light output by a light source to the illumination assembly; the entrance port of the endoscope is connected to the exit port of the illumination assembly and configured to receive light emitted by the exit port of the illumination assembly; the endoscope is configured to transmit the light received by the entrance port of the endoscope to the exit port of the endoscope via a light guide fiber in the endoscope and emit the light from the exit port of the endoscope to observe a target area.

[0163] It can be understood by those skilled in the art that all or part of the processes in the above-mentioned embodiments can be completed by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, the processes of the above-mentioned embodiments can be included. Any reference to a memory, a database or other medium used in the embodiments provided in the present application can include at least one of a non-volatile memory and a volatile memory. The non-volatile memory can include a read-only memory (ROM), a magnetic tape, a floppy disk, a flash memory, an optical storage, a high-density embedded non-volatile memory, a resistive memory (ReRAM), a magnetoresistive random access memory (MRAM), a ferroelectric memory (FRAM), a phase change memory (PCM), a graphene memory, etc. The volatile memory can include a random access memory (RAM) or an external cache memory, etc. As an illustration but not limitation, the RAM can be in various forms, such as a static random access memory (SRAM) or a dynamic random access memory (DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., but is not limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0164] Any technical features in the above embodiments can be combined, and for the sake of brevity, not all possible combinations are described above, however, as long as the combinations of technical features do not have contradictions, they shall be considered within the scope of the present disclosure.

[0165] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent scope of the present application. It shall be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. An illumination assembly for an endoscope, characterized by, The illumination assembly comprises a taper part and a lens part which are integrally formed; The taper part comprises a large-diameter end and a small-diameter end; the light-out surface of the lens part comprises a total reflection surface, a refraction surface and an inclined plane; The large-diameter end of the taper part is connected with the light-out surface of a light guide beam, and the small-diameter end of the taper part is connected with the lens part; The outgoing light of the light guide beam is incident on the taper part from the large-diameter end, converges and adjusts the beam angle in the taper part, and then is emitted from the small-diameter end to enter the lens part; a part of the light beam incident on the lens part is totally reflected on the total reflection surface and then reaches the light-out port of the illumination assembly, and another part is refracted on the refraction surface and then reaches the light-out port of the illumination assembly; the inclined plane is used for deflecting the outgoing light of the total reflection surface to the light-out port of the illumination assembly.

2. The illumination assembly for an endoscope of claim 1, wherein, The taper part and the lens part are made of optical glass.

3. The illumination assembly for an endoscope according to claim 1, characterized in that: The side surface of the taper part is coated with an aluminum film or a silver film; and the total reflection surface of the lens part is coated with an aluminum film or a silver film; And / or, the refraction surface of the lens part is coated with an anti-reflection film.

4. The illumination assembly for an endoscope of claim 1, wherein, The refraction surface and / or the total reflection surface of the lens part is provided with a microstructure layer; The microstructure layer is a microlens array or a diffractive optical element.

5. A method of determining parameters of a lighting assembly for an endoscope according to any one of claims 1 to 4, characterized in that, The parameters of the taper part are determined, including: The taper angle of the taper part is determined based on the radius of the large-diameter end and the radius of the small-diameter end of the taper part, and a preset angle threshold of the outgoing light at the small-diameter end of the taper part; the preset angle threshold is the minimum value of the included angle between the incident light of the total reflection surface of the lens part and the central axis of the taper part when the angle of the incident light of the total reflection surface of the lens part is greater than or equal to the critical angle of total reflection.

6. The parameter determination method of a lighting assembly according to claim 5, characterized in that, The parameters of the refraction surface of the lens part are determined, including: Based on the light intensity distribution of the light rays incident on the refraction surface of the lens part after preliminary adjustment, and a preset light-out port surface, an energy mapping relationship between the incident light of the refraction surface of the lens part and the light-out port surface is established; Based on the energy mapping relationship between the incident light of the refraction surface of the lens part and the light-out port surface, and a preset first lens generatrix reference point, the coordinates and normal vectors of all points on the first free-form lens generatrix are obtained by using the Snell's law formula; the first free-form lens is a free-form lens corresponding to the refraction surface of the lens part; Based on the coordinates and normal vectors of all points on the first free-form lens generatrix, the parameters of the refraction surface of the lens part are determined; the parameters include the radius of curvature, the conic constant and the coordinates of each point.

7. The parameter determination method of a lighting assembly according to claim 5, characterized in that, The parameters of the total reflection surface of the lens part are determined, including: Based on the light intensity distribution of the light rays incident on the total reflection surface of the lens part after preliminary adjustment, and the preset light-out port surface, an energy mapping relationship between the incident light of the total reflection surface of the lens part and the light-out port surface is established; obtain coordinates and normal vectors of all points on a second free-form lens generatrix based on the energy mapping relationship between the incident light rays of the total reflection surface of the lens portion and the light outlet surface and a preset second lens generatrix reference point; the second free-form lens is a free-form lens corresponding to the total reflection surface of the lens portion; determine parameters of the total reflection surface of the lens portion based on the coordinates and normal vectors of all points on the second free-form lens generatrix.

8. The parameter determination method of a lighting assembly according to claim 7, characterized in that, Before the energy mapping relationship between the incident light rays of the total reflection surface of the lens portion and the light outlet surface is established based on the light intensity distribution of the light rays incident on the total reflection surface of the lens portion after the preliminary adjustment and the preset light outlet surface, the method comprises the following steps: adjust the position of the light outlet surface based on the angle range requirement of the light outlet angle at the light outlet surface to obtain the position of the adjusted light outlet surface.

9. A parameter determination device of a lighting assembly for implementing the parameter determination method of any one of claims 5 to 8, characterized in that The device comprises: a first parameter determination module configured to determine a taper angle of the taper portion based on a radius of a large-diameter end and a radius of a small-diameter end of the taper portion and a preset angle threshold of the light rays emitted at the small-diameter end of the taper portion; a first mapping construction module configured to establish an energy mapping relationship between the incident light rays of the refractive surface of the lens portion and the light outlet surface based on the light intensity distribution of the light rays incident on the refractive surface of the lens portion after the preliminary adjustment and the preset light outlet surface; a first coordinate determination module configured to obtain coordinates and normal vectors of all points on a first free-form lens generatrix based on the energy mapping relationship between the incident light rays of the refractive surface of the lens portion and the light outlet surface and a preset first lens generatrix reference point by using Snell's law formula; the first free-form lens is a free-form lens corresponding to the refractive surface of the lens portion; a second parameter determination module configured to determine parameters of the refractive surface of the lens portion based on the coordinates and normal vectors of all points on the first free-form lens generatrix; the parameters comprise a curvature radius, a conic constant and coordinates of each point; a second mapping construction module configured to establish an energy mapping relationship between the incident light rays of the total reflection surface of the lens portion and the light outlet surface based on the light intensity distribution of the light rays incident on the total reflection surface of the lens portion after the preliminary adjustment and the preset light outlet surface; a second coordinate determination module configured to obtain coordinates and normal vectors of all points on a second free-form lens generatrix based on the energy mapping relationship between the incident light rays of the total reflection surface of the lens portion and the light outlet surface and a preset second lens generatrix reference point; the second free-form lens is a free-form lens corresponding to the total reflection surface of the lens portion; a third parameter determination module configured to determine parameters of the total reflection surface of the lens portion based on the coordinates and normal vectors of all points on the second free-form lens generatrix.

10. An endoscope system integrated with the illumination assembly for an endoscope according to any one of claims 1 to 4, characterized in that, The system further comprises a light guide beam, a light source host and an endoscope; the endoscope comprises an entrance of the endoscope and an exit of the endoscope; the light guide beam is configured to transmit the light rays output by the light source host to the illumination assembly; the entrance of the endoscope is connected to the exit of the illumination assembly and is configured to receive the light rays emitted by the exit of the illumination assembly; The endoscope is used to transmit the light received by the light inlet of the endoscope to the light outlet of the endoscope by the light guide fiber in the endoscope to emit and observe the target area.

Images