Illumination assembly for endoscope and parameter determination method of illumination assembly

Abstract

The invention relates to an illumination assembly for an endoscope and a parameter determination method of the illumination assembly. The lighting assembly comprises a cone part and a lens part, and the cone part and the lens part are integrally formed. The cone part comprises a large-caliber end and a small-caliber end; the light-emitting surface of the lens part comprises a fully reflecting surface and a refracting surface; the large-aperture end of the cone part is connected with the light-emitting surface of the light-transmitting bundle, and the small-aperture end of the cone part is connected with the lens part; emergent light of the light guide beam enters the cone part from the large-caliber end, is converged by the cone part, is subjected to beam angle adjustment, is emergent from the small-caliber end and enters the lens part, and part of the light beam entering the lens part is subjected to total internal reflection on the total reflection surface and then reaches a light outlet of the illumination assembly; and the other part of light is refracted on the refracting surface and then reaches the light outlet of the lighting assembly. The problem that according to an existing endoscope illumination assembly, distribution uniformity and large-angle illumination cannot be considered in the light coupling and transmission process is solved.

Description

Technical Field

[0001] The present application relates to the technical field of endoscopes, and in particular to an illumination component for an endoscope and a method for determining parameters of the illumination component. Background Art

[0002] With the development of endoscopy technology, it has gained widespread application in the medical field. In practical applications, electronic endoscopes require lighting components for observation and other operations. These lighting components optimize the light distribution and angle of the light source.

[0003] Existing endoscope lighting assemblies primarily use conical surfaces or convex lenses to couple light between the light guide and the mirror. When a conical body is used for coupling, the light is limited in its ability to adjust the light as it travels from the light guide to the conical surface and into the mirror, resulting in uneven light distribution during the coupling and transmission process. While using a convex lens to couple the light between the light guide and the mirror allows for some adjustment of the light angle and focus, it is limited by the lens's refractive index and cannot achieve wide-angle illumination.

[0004] For existing endoscope lighting components, the light coupling and transmission process cannot take into account both distribution uniformity and wide-angle lighting, and no effective solution has been proposed so far. Summary of the Invention

[0005] Based on this, it is necessary to provide a lighting assembly for an endoscope and a method for determining parameters of the lighting assembly in order to address the above technical issues.

[0006] In a first aspect, the present application provides a lighting assembly for an endoscope. The lighting assembly includes a cone portion and a lens portion, wherein the cone portion and the lens portion are integrally formed;

[0007] The cone portion includes a large-diameter end and a small-diameter end; the light-emitting surface of the lens portion includes a total reflection surface and a refraction surface;

[0008] The large-diameter end of the cone portion is connected to the light-emitting surface of the light guide, and the small-diameter end of the cone portion is connected to the lens portion;

[0009] The outgoing light of the guide beam enters the conical portion from the large-aperture end, is converged and the beam angle is adjusted by the conical portion, and then is emitted from the small-aperture end and enters the lens portion. A portion of the light beam entering the lens portion undergoes total internal reflection on the total reflection surface and reaches the light outlet of the lighting component, while the other portion undergoes refraction on the refractive surface and reaches the light outlet of the lighting component.

[0010] In one embodiment, the cone portion and the lens portion are both made of optical glass.

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

[0012] And / or, the refractive surface of the lens portion is coated with an anti-reflection film.

[0013] In one embodiment, the lens portion further includes an oblique plane;

[0014] The inclined plane is used to deflect the outgoing light from the total reflection surface to the light outlet of the lighting component.

[0015] In one embodiment, a microstructure layer is provided on the refractive surface and / or the total reflection surface of the lens portion;

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

[0017] In a second aspect, the present application further provides a method for determining parameters of an illumination assembly. The method is used to determine the parameters of the illumination assembly for an endoscope described in the first aspect, and to determine the parameters of the cone portion, including:

[0018] The cone angle of the cone portion is determined based on the radius of the large-aperture end and the radius of the small-aperture end of the cone portion, and a preset angle threshold of the outgoing light of the cone portion at the small-aperture end; the preset angle threshold is the minimum value of the angle between the incident light on the reflection surface of the lens portion and the central axis of the cone portion when the angle of the incident light entering the total reflection surface of the lens portion is greater than or equal to the critical angle of total reflection.

[0019] In one embodiment, determining the parameters of the refractive surface of the lens portion includes:

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

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

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

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

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

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

[0027] In one embodiment, before establishing an energy mapping relationship between the incident light on the total reflection surface of the lens portion and the light exit surface based on the light intensity distribution of the light incident on the total reflection surface of the lens portion after the preliminary adjustment and the preset light exit surface, the method includes:

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

[0029] In a third aspect, the present application further provides a device for determining parameters of a lighting assembly. The device is used to implement the method for determining parameters of the lighting assembly described in the second aspect, and includes:

[0030] a first parameter determination module, configured to determine a cone angle of the cone portion based on a radius of the large-aperture end and a radius of the small-aperture end of the cone portion, and a preset angle threshold of an outgoing light ray of the cone portion at the small-aperture end;

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

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

[0033] a second parameter determination module, configured to determine the parameters of the refractive surface of the lens portion based on the coordinates and normal vectors of all points on the generatrix of the first free-form surface lens; the parameters including the radius of curvature, the 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 on the total reflection surface of the lens portion and the light exit surface based on the light intensity distribution of the light incident on the total reflection surface of the lens portion after the preliminary adjustment and a preset light exit surface;

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

[0036] The third parameter determination module is used to determine the 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 surface lens generatrix.

[0037] In a fourth aspect, the present application further provides an endoscope system. The endoscope system integrates the lighting assembly for an endoscope described in the first aspect. The system further includes: a light guide, a light source host, and an endoscope; the endoscope includes a light inlet and a light outlet of the endoscope;

[0038] The light guide is used to transmit the light output by the light source host to the lighting assembly;

[0039] The light inlet of the endoscope is connected to the light outlet of the lighting assembly and is used to receive the light emitted by the light outlet of the lighting assembly;

[0040] The endoscope is used to transmit the light received by the light inlet of the endoscope to the light outlet of the endoscope through the light-guiding fiber in the endoscope to observe the target area.

[0041] The above-mentioned lighting assembly for endoscopes includes a cone portion and a lens portion, which are integrally formed; the cone portion includes a large-diameter end and a small-diameter end; the light-emitting surface of the lens portion includes a total reflection surface and a refractive surface; the large-diameter end of the cone portion is connected to the light-emitting surface of the light guide, and the small-diameter end of the cone portion is connected to the lens portion; the outgoing light of the light guide enters the cone portion from the large-diameter end, and after being converged and the beam angle adjusted by the cone portion, it is emitted from the small-diameter end and enters the lens portion. A part of the light beam incident on the lens portion undergoes total internal reflection on the total reflection surface and reaches the light outlet of the lighting assembly, and the other part undergoes refraction on the refractive surface and reaches the light outlet of the lighting assembly. The cone converges and adjusts the angle of input light. The refractive surface of the lens refracts a portion of the incident light for uniform output. The total internal reflection surface expands the angle of the remaining portion before outputting it. By combining the cone with a lens designed based on the principle of total internal reflection, the synergistic effects of refraction and total reflection enable precise adjustment of the beam angle and optimized light intensity distribution. This solves the problem of existing endoscope lighting components, which struggle to achieve both uniform distribution and wide-angle illumination during the light coupling and transmission processes.

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

[0043] The drawings described herein are used to provide a further understanding of the present application and constitute a part 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. In the drawings:

[0044] Figure 1 This is a structural schematic diagram of a lighting assembly for an endoscope provided in one embodiment of the present application;

[0045] Figure 2 A schematic diagram of the transmission path of light in a lighting assembly according to an embodiment of the present application;

[0046] Figure 3 This is a hardware structure block diagram of a terminal of a method for determining parameters of a lighting assembly provided in an embodiment of the present application;

[0047] Figure 4 A schematic diagram of the virtual light source end face division result provided in one embodiment of the present application;

[0048] Figure 5 A schematic diagram of the mapping relationship between a light source and a target plane provided in one embodiment of the present application;

[0049] Figure 6 A schematic diagram of the structure of a first free-form surface lens generatrix provided in one embodiment of the present application;

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

[0051] Figure 8 A schematic diagram of a lighting assembly determined by modeling based on calculated parameters provided in an embodiment of the present application;

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

[0053] Figure 10 A schematic diagram of incident light of a lighting assembly provided in one embodiment of the present application;

[0054] Figure 11 A schematic diagram of the emitted light of the lighting assembly provided in one embodiment of the present application;

[0055] Figure 12 Schematic diagram of light distribution changes before and after optimization of the lighting assembly provided in one 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 illustrated below in conjunction with the accompanying drawings and embodiments.

[0057] Unless otherwise defined, technical or scientific terms used in this application shall have the ordinary meanings as understood by persons of ordinary skill in the art to which this application belongs. The terms "a," "an," "the," "these," and similar expressions in this application do not denote limitations on quantity and may be singular or plural. The terms "comprise," "include," "have," and any variations thereof, as used in this application, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device comprising a series of steps or modules (units) is not limited to the listed steps or modules (units) but may include unlisted steps or modules (units) or other steps or modules (units) inherent to the process, method, product, or device. The terms "connected," "connected," "coupled," and similar expressions used in this application are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. As used in this application, "plurality" means two or more. "And / or" describes an association between associated objects, indicating that three possible relationships exist. For example, "A and / or B" may mean: A exists alone; A and B exist simultaneously; or B exists alone. Generally, the character " / " indicates that the objects in the preceding and following relationship are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0058] In this embodiment, a lighting assembly for an endoscope is provided. Figure 1 FIG. 1 is a schematic structural diagram of a lighting assembly for an endoscope according to this embodiment. Figure 1 As shown, the lighting assembly includes a cone portion 110 and a lens portion 120, and the cone portion 110 and the lens portion 120 are integrally formed; the cone portion 110 includes a large-diameter end and a small-diameter end; the light-emitting surface of the lens portion 120 includes a total reflection surface 122 and a refractive surface 124; the large-diameter end of the cone portion 110 is connected to the light-emitting surface of the light guide, and the small-diameter end of the cone portion 110 is connected to the lens portion 120; the outgoing light of the light guide enters the cone portion 110 from the large-diameter end, and after being converged and the beam angle adjusted by the cone portion 110, it is emitted from the small-diameter end and enters the lens portion 120. A part of the light beam incident on the lens portion 120 is totally internally reflected on the total reflection surface 122 and reaches the light outlet of the lighting assembly, and the other part is refracted on the refractive surface 124 and reaches the light outlet of the lighting assembly.

[0059] The cone portion 110 is a three-dimensional component with a truncated cone structure. The cone portion 110 is used to initially converge and adjust the light output by the light guide. Figure 1As shown, the small-aperture end of the cone portion 110 transitions directly to the total reflection surface 122 of the lens portion 120. The refractive surface 124 of the lens portion 120 utilizes a free-form surface design. In this embodiment, the outgoing light beam from the light guide enters the cone portion 110 from the large-aperture end and undergoes total internal reflection from the side surfaces of the cone portion 110, converging the light and adjusting the beam angle. The adjusted light then enters the lens portion 120 through the small-aperture end. A portion of the light beam incident on the lens portion 120 undergoes total internal reflection from the total reflection surface 122 and reaches the light outlet of the lighting assembly, while the remaining portion undergoes refraction from the refractive surface 124 and reaches the light outlet of the lighting assembly. This process utilizes the coordinated effects of refraction and total reflection to adjust the angle and intensity distribution of the light beam, achieving optimized beam expansion and light uniformity. The matching of parameters (such as curvature radius and angle) between the refractive surface 124 and the total reflection surface 122 is key to the synergistic effect 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 (TIR). Its angle and shape ensure that light undergoes total internal reflection within the lens portion 120. Specifically, by adjusting the angles and shapes of the total reflection surface 122 and the refractive surface 124 of the lens portion 120, the angle expansion and light uniformity of the light beam can be optimized. The maximum emission angle of the expanded light can reach 180°. Based on this, the lens portion 120, through the synergistic effect of the refractive surface 124 and the total reflection surface 122, can effectively solve the problem of uneven light distribution in the prior art, significantly improve the uniformity of endoscope illumination, and enable users to obtain clearer and more accurate visual information.

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

[0061] When designing an endoscope lighting assembly, material selection is crucial to its performance. Therefore, the cone 110 and lens 120 can be made from high-refractive-index, low-dispersion optical glass, 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 and reduce chromatic aberration. It should be noted that the material of the aforementioned optical glass is not specifically limited in this embodiment; as long as it possesses high refractive index and low dispersion, it will suffice.

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

[0063] Because the lighting component is a solid component, the cone or lens is not coated, and the coating is applied to the outer surface. The side of the cone 110 is coated with aluminum or silver; the total reflection surface 122 of the lens 120 is coated with aluminum or silver, both to improve 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 specifically 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] Also, see Figure 1 In one embodiment, the lens portion 120 further includes an inclined plane 126 ; the inclined plane 126 is used to deflect the light emitted from the total reflection surface 122 to the light outlet of the lighting assembly.

[0065] 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 radially outermost edge contour of the refractive surface 124 .

[0066] Figure 2 This is a schematic diagram of the transmission path of light in a lighting component provided in one embodiment of the present application. Figure 2 As shown, the outgoing light of the light guide enters the cone portion 110 from the large-diameter end, and a part of the light entering the cone portion 110 is directly incident on the lens portion 120 through the cone portion 110, and the other part of the light will undergo one or more total reflections in the cone portion 110 and then enter the lens portion 120. A part of the light entering the lens portion 120 is refracted by the refractive surface 124 of the lens portion 120 and reaches the light outlet of the lighting component, and a part of the light entering the lens portion 120 is reflected by the total reflection surface 122 of the lens portion 120 and then deflected by the inclined plane 126 to reach the light outlet of the lighting component. Figure 2 The arrows indicate the direction of light transmission.

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

[0068] The aforementioned microstructure layer is a micron-scale 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 , and is realized by precision engraving technology or photolithography technology.

[0069] The microlens array can be a two-dimensional optical structure layer composed of a large number of regularly arranged microlenses, which can be presented in the form of a pattern. The microlens array achieves uniform light intensity distribution on a macro scale by subdividing the incident light into multiple small beams, with each microlens focusing or diverging the light. Adding a microlens array to the refractive surface 124 of the lens portion 120 can further optimize light and achieve light superposition. Adding a microlens pattern to the total reflection surface 122 can also achieve better light superposition.

[0070] The diffractive optical element can be an optical device that precisely manipulates the phase of light waves through surface micro- and nanostructures. This element manipulates light waves based on the principle of light diffraction. Specifically, the manipulation process can utilize microstructures (such as gratings or phase steps) to phase-modulate the incident light wavefront and reconstruct the outgoing light field distribution.

[0071] The method embodiment provided in this embodiment can be executed in a terminal, a computer or a similar computing device. For example, running on a terminal, Figure 3 FIG. 1 is a block diagram of the hardware structure of the terminal of the method for determining the parameters of the lighting assembly of this embodiment. Figure 3 As shown, the terminal may include one or more ( Figure 3 Only one is shown) a processor 302 and a memory 304 for storing data, wherein the processor 302 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA. The terminal may also include a transmission device 306 for communication functions and an input and output device 308. It will be understood by those skilled in the art that Figure 3 The structure shown is only for illustration and does not limit the structure of the above terminal. Figure 3 More or fewer components than shown, or with Figure 3 Different configurations shown.

[0072] Memory 304 can be used to store computer programs, such as application software programs and modules, such as the computer program corresponding to the method for determining parameters of a lighting assembly in this embodiment. Processor 302 executes the computer programs stored in memory 304 to execute various functional applications and data processing, thereby implementing the aforementioned method. Memory 304 can include high-speed random access memory (RAM) and non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, memory 304 may further include memory located remotely from processor 302, which can be connected to the terminal via a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0073] Transmission device 306 is used to receive or transmit data via a network. This network may include a wireless network provided by the terminal's communications provider. In one embodiment, transmission device 306 includes a network interface controller (NIC), which can be connected to other network devices via a base station to enable communication with the Internet. In another embodiment, transmission device 306 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0074] In this embodiment, a method for determining parameters of a lighting assembly is provided. The method for determining parameters of the cone portion 110 of the lighting assembly in this embodiment includes the following steps:

[0075] Step S1, determining the cone angle of the cone portion 110 based on the radius of the large-aperture end and the radius of the small-aperture end of the cone portion 110, and a preset angle threshold of the outgoing light of the cone portion 110 at the small-aperture end; the preset angle threshold is the minimum value of the angle between the incident light on the total reflection surface 122 of the lens portion 120 and the central axis of the cone portion 110 when the angle of the incident light entering the total reflection surface 122 of the lens portion 120 is greater than or equal to the critical angle of total reflection.

[0076] When light enters the total reflection surface 122 at an inappropriate angle, some light may not be able to undergo total internal reflection 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 entering the total reflection surface 122 of the lens portion 120 can undergo total reflection, it is necessary to design the cone angle of the cone portion 110 and the parameters of the total reflection surface 122 of the lens portion 120 so that the angle at which the light enters 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 angle of incidence at which total reflection occurs on the total reflection surface 122 of the lens portion 120. When designing the cone portion 110, generally, the large-aperture end of the cone portion 110 is connected to the light guide. Therefore, the size of the large-aperture end is related to the size of the light guide outlet, and the radius of the large-aperture end is fixed. The small-aperture end is connected to the lens portion 120. For design convenience, the radius of the small-aperture end can be fixed first, and only the cone angle of the cone portion 110 can be adjusted. The cone angle of the cone portion 110 is the vertex angle of the original complete cone corresponding to the cone portion 110 .

[0077] The process of determining the cone angle of the cone portion 110 based on the radius of the large-aperture end and the radius of the small-aperture end of the cone portion 110 and the preset angle threshold of the light emitted from the cone portion 110 at the small-aperture end can be expressed by the following formula:

[0078] ;

[0079] Wherein, θ is the cone angle of the cone portion 110, R1 is the radius of the large-diameter end of the cone portion 110, and R2 is the radius of the small-diameter end of the cone portion 110. is the preset angle threshold.

[0080] In one embodiment, a method for determining parameters of the refractive surface 124 of the lens portion 120 of the lighting assembly includes the following steps:

[0081] Step S2 : establishing an energy mapping relationship between the incident light on the refractive surface 124 of the lens portion 120 and the light exit surface based on the light intensity distribution of the light incident on the refractive surface 124 of the lens portion 120 after preliminary adjustment and the preset light exit surface.

[0082] The above-mentioned light outlet surface can be the plane where the light outlet of the lighting component is located. In this embodiment, the above-mentioned light outlet surface can be the surface or interface where the light is emitted from the light outlet, that is, the exit plane where the light energy propagates from the inside of the lighting component to the external environment.

[0083] The energy mapping relationship between the incident light and the light exit surface of the refractive surface 124 of the lens portion 120 is established by first dividing the energy of the incident light, then dividing the light exit surface into equal areas, and finally establishing the energy mapping relationship between the light source and the target plane based on the energy division results of the incident light and the equal area division results of the light exit surface. The specific process is as follows:

[0084] After light enters the cone portion 110 and is converged and the beam angle is adjusted by the cone portion 110, it can be considered that the light forms a virtual light-emitting surface with a certain uniformity and light-emitting size at the plane where the small-aperture end of the cone portion 110 is located. This virtual light-emitting surface can be used to divide the energy of the light incident on the lens portion 120. In this embodiment, taking the incident light as Gaussian light intensity as an example, the light intensity distribution of the virtual light-emitting surface (which can be simply referred to as a virtual light source) and the cross section of the small-aperture end is determined as follows:

[0085] ;

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

[0087] z is the coordinate of the beam waist at the narrowest part of the virtual luminous surface on the optical axis, then z=0, and the light intensity distribution of the cross section between the virtual luminous surface and the small aperture end is:

[0088] ;

[0089] The total energy of the light beam incident on the lens unit 120 for:

[0090] ;

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

[0092] ;

[0093] Solve the above formula to get the horizontal coordinate of the radius of each equal energy ring of the light source on the X axis , where i=1, 2,…, N+1.

[0094] It should be noted that the number N can be set based on specific needs. To ensure more accurate calculation parameters, N needs to be sufficiently large. However, increasing N increases the amount of computation required and consumes more computing resources. Therefore, N should be set to an appropriate value. In addition, the light source in this embodiment uses Gaussian light intensity as an example. If different light sources have different light intensity distributions, as long as the light energy can be divided based on the light intensity distribution, this embodiment does not specifically limit the type of light source.

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

[0096] In addition, after being refracted by the refractive surface 124 of the lens portion 120 , the light is output from the light outlet and is divided into equal areas on the light outlet surface (which may be referred to as a target plane).

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

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

[0099] ;

[0100] The iterative relationship can be obtained:

[0101] ;

[0102] Thus, the radius of each ring can be calculated , so far the target plane has been divided into N circular units of equal area.

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

[0104] According to edge ray theory, when all edge rays of a light beam are incident on the edge of a corresponding surface, all rays within the beam will be incident on that surface. Therefore, if we want to achieve uniform illumination of a circular spot, 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. This ensures that the same energy is incident on each equal-area circular ring, thus achieving uniform illumination of the circular spot.

[0105] According to the above principle, in order to obtain a uniform circular light spot with the required angle, the radius is set to and The light on the ring boundary is refracted or reflected by the free surface and then refracted or reflected to the target plane with a radius of and On the circular boundary, the energy mapping relationship between the light source and the target plane is established.

[0106] Figure 5 Schematic diagram of the mapping relationship between the light source and the target plane provided in this embodiment. Figure 5 As shown, the circle represented by the shadow of the light source corresponds to the circle represented by the shadow of the target plane.

[0107] Step S3, based on the energy mapping relationship between the incident light and the light exit surface of the refractive surface 124 of the lens portion 120, and the preset first lens bus bar reference point, using the Snell's law formula, obtain the coordinates and normal vectors of all points on the first free-form surface lens bus bar; the first free-form surface lens is the free-form surface lens corresponding to the refractive surface 124 of the lens portion 120.

[0108] Based on the energy mapping relationship between the incident light and the light exit surface of the refractive surface 124 of the lens portion 120 and the preset first lens generatrix reference point, the process of obtaining the coordinates and normal vectors of all points on the first free-form surface lens generatrix using Snell's law formula is as follows:

[0109] Because both the light source and target planes are equally divided into N parts, and the number of divisions is sufficiently large, it can be approximately assumed that two adjacent points on the reflective surface of lens portion 120 are on the same tangent plane. Based on this geometric approximation, when a point on the lens is solved, it can be approximately assumed that the next point is also on the tangent plane of that point.

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

[0111] ;

[0112] in, is the unit direction vector of the incident light, is the unit direction vector of the outgoing light, is the unit normal vector of point P on the free surface, and are the refractive index of the medium in which the lens is located and the refractive index of the free-form lens material, respectively. In the design, since the refractive index of air is approximately 1, n0=1 is taken, and the Snell's law formula becomes:

[0113] ;

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

[0115] Figure 6 This is a schematic diagram of the structure of the first free-form surface lens busbar provided in this embodiment. Figure 6 As shown, the target surface is the target plane, P i+1 Represents the first free-form surface lens generatrix The i+1th point on the Represents the first free-form surface lens generatrix Normal vector at point i+1, Q i+1 (r i+1 , h) represents the point r on the target surface i+1 The coordinates of the location.

[0116] Step S4, determining 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 surface lens generatrix; the parameters include the curvature radius, the cone constant and the coordinates of each point.

[0117] After determining the coordinates and normal vectors of all points on the first free-form lens generatrix, these data must be imported into the 3D modeling software Rhinoceros. All points are then connected to form a B-spline curve, representing the first free-form lens generatrix (the free-form lens generatrix). Finally, the first free-form lens generatrix is rotated about the Z axis to form the individual points on 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 expressed by an aspheric surface formula. The expression formula for the refractive surface 124 of the lens portion 120 is:

[0119] ;

[0120] Among them, c is the curvature of the aspheric surface, which is the inverse of the curvature radius, K is the conic constant of the aspheric surface, and B1, B2, and B3 are the coefficients of the multi-terms respectively.

[0121] Furthermore, the coordinates of the plurality of points on the refractive surface 124 of the lens portion 120 are substituted into the above-mentioned formula for representing the refractive surface 124 of the lens portion 120 to obtain parameters of the refractive surface 124 of the lens portion 120 such as the radius of curvature and the aspheric conic constant.

[0122] In the above steps S2 to S4, based on the light intensity distribution of the light incident on the refractive surface 124 of the lens portion 120 after preliminary adjustment and the preset light exit surface, an energy mapping relationship between the incident light and the light exit surface of the refractive surface 124 of the lens portion 120 is established. Then, based on the energy mapping relationship between the incident light and the light exit surface of the refractive surface 124 of the lens portion 120 and the preset first lens generatrix reference point, the coordinates and normal vectors of all points on the first free-form surface lens generatrix are obtained using Snell's law formula. Based on the coordinates and normal vectors of all points on the first free-form surface lens generatrix, the parameters of the refractive surface 124 of the lens portion 120 are determined. By determining 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 achieve precise adjustment of the beam angle and optimization of the light intensity distribution, thereby significantly improving the uniformity of the endoscope illumination and the field of view quality.

[0123] Specifically, in one embodiment, a method for determining parameters of the total reflection surface 122 of the lens portion 120 of the lighting assembly includes the following steps:

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

[0125] Figure 7 Schematic diagram of the division of the virtual light-emitting surface provided in this embodiment. Figure 7 As shown, the virtual light-emitting surface is divided into a middle area and a peripheral area. The middle area of the virtual light-emitting surface ( Figure 7 The black area in the middle) is used to design the refractive surface 124 of the lens portion 120, and the peripheral area of the virtual light emitting surface ( Figure 7 The blue area (in the figure) is used to design the total reflection surface 122 of the lens portion 120. The use of the peripheral total reflection surface 122 is primarily to overcome the problem of refraction not being able to achieve fill light at large angles. This is because angles greater than the total reflection angle result in reflection instead of refraction. In this embodiment, the energy mapping relationship between the incident light and the light exit surface of the total reflection surface 122 of the lens portion 120 can be constructed using the same method as step S2.

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

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

[0128] The formula for the law of reflection vector is:

[0129] ;

[0130] in, is the unit direction vector of the incident light, is the unit direction vector of the outgoing light, N 11 is the unit normal vector of point P on the free surface.

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

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

[0133] Step S7: determining 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 surface lens generatrix.

[0134] After determining the coordinates and normal vectors of all points on the second free-form lens generatrix, these data must be imported into the 3D modeling software Rhinoceros. All points are then connected to form a B-spline curve, representing the second free-form lens generatrix (the free-form lens generatrix). Finally, the second free-form lens generatrix is rotated about the Z axis to form the individual points on the total reflection surface 122 of the lens portion 120.

[0135] Since the total reflection surface 122 of the lens portion 120 is a free-form surface, it can be expressed using an aspheric surface formula.

[0136] Furthermore, the obtained coordinates of multiple points on the total reflection surface 122 of the lens portion 120 are substituted into the aspheric surface formula to obtain parameters of the total reflection surface 122 of the lens portion 120 such as the curvature radius and the aspheric conic constant.

[0137] In the above steps S5 to S7, based on the light intensity distribution of the light incident on the total reflection surface 122 of the lens portion 120 after preliminary adjustment and the preset light exit surface, an energy mapping relationship between the incident light and the light exit surface of the total reflection surface 122 of the lens portion 120 is established. Then, based on the energy mapping relationship between the incident light and the light exit surface of the total reflection surface 122 of the lens portion 120 and the preset second lens generatrix reference point, the coordinates and normal vectors of all points on the second free-form surface lens generatrix are obtained. Finally, based on the coordinates and normal vectors of all points on the second free-form surface lens generatrix, the parameters of the total reflection surface 122 of the lens portion 120 are determined. By determining the parameters of the total reflection surface 122 of the lens portion 120, the total reflection surface 122 of the lens portion 120 is constructed, and then the design of the cone portion 110 and the lens portion 120 is realized, and the synergistic effect of refraction and total reflection is utilized to achieve precise adjustment of the beam angle and optimization of the light intensity distribution, thereby significantly improving the uniformity of the endoscope illumination and the field of view quality.

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

[0139] Step S4.8: Based on the angle range requirement of the light exit angle at the light exit, the position of the light exit surface is adjusted to obtain the adjusted position of the light exit surface.

[0140] It should be noted that when the angle range requirement of the light output angle at the light output port is changed, the position of the light output port surface can be adjusted, that is, the unit direction vector of the output light can be changed. By changing the unit direction vector of the output light, the energy mapping relationship between the incident light of the total reflection surface 122 of the lens portion 120 and the light output port surface can be changed to achieve the angle expansion requirement of the light output surface of the lighting component, and then achieve the angle expansion requirement of the light output surface of the endoscope.

[0141] In a specific embodiment, a 6 mm (diameter of the large aperture end of the cone) light spot is coupled to a 2 mm (diameter of the light exit port), while simultaneously performing angle expansion and light homogenization.

[0142] Using the specific process of steps S1 to S7, the parameters of the optical component are designed, and the coordinates of multiple points on 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. The parameters of the refractive surface 124 of the lens portion 120, such as the curvature radius and the aspheric conic constant, are obtained as shown in Table 1.

[0143] Table 1

[0144]

[0145] Substituting the coordinates of multiple points on the total reflection surface 122 of the lens portion 120 into the above-mentioned expression formula of the total reflection surface 122 of the lens portion 120 , the parameters of the refractive surface 124 of the lens portion 120 , such as the curvature radius and the aspheric conic constant, are obtained as shown in Table 2.

[0146] Table 2

[0147]

[0148] Figure 8 This is a schematic diagram of a lighting assembly determined by modeling based on the calculated parameters provided in this embodiment. Figure 8 As shown, the distance between the plane where the large-diameter end of the cone portion is located and the light outlet surface is 10 mm. Figure 9 This is a schematic diagram of the angle correction effect provided by this embodiment. Figure 9 As shown in the figure, the incident light angle is expanded from 30 degrees to 160 degrees (light output angle) to achieve large-angle light fill. Figure 10 Schematic diagram of incident light of the lighting assembly provided in this embodiment. Figure 11 Schematic diagram of the light emitted by the lighting assembly provided in this embodiment. Figure 11It can be seen that the uniformity of the emitted light is also well optimized after the angle is expanded, from the previous obvious overbrightness in the center to a smooth transition from the center to the edge. Figure 12 This is a schematic diagram of the light distribution change before and after the lighting assembly is optimized. Figure 12 As shown, through the optimization of the lighting components, the problem of excessive light in the center is significantly improved, which is beneficial to the exposure processing of the image.

[0149] In the above example, the diameter of the large-aperture end of the cone (i.e., the diameter of the surface where light enters the lighting assembly) is 6 mm, and the diameter of the light exit surface is 2 mm. It should be noted that the diameters of the surface where light enters the lighting assembly and the light exit surface can be set according to specific needs and are not specifically limited in this embodiment.

[0150] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0151] Based on the same inventive concept, this embodiment also provides a device for determining parameters of a lighting assembly. This device is used to implement the above-mentioned embodiments and preferred implementations, and details already described will not be repeated. The terms "module," "unit," "subunit," etc. used below may refer to a combination of software and / or hardware that implements the predetermined functions. Although the devices described in the following embodiments are preferably implemented using software, implementation using hardware, or a combination of software and hardware, is also possible and contemplated.

[0152] In one embodiment, an embodiment of the present application provides a device for determining parameters of a lighting assembly, the device for determining parameters of the lighting assembly including:

[0153] a first parameter determination module, configured to determine a cone angle of the cone portion 110 based on a radius of the large-aperture end and a radius of the small-aperture end of the cone portion 110, and a preset angle threshold of an outgoing light beam from the cone portion 110 at the small-aperture end;

[0154] A first mapping construction module is configured to establish an energy mapping relationship between the incident light on the refractive surface 124 of the lens portion 120 and the light exit 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 exit surface;

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

[0156] A second parameter determination module is used 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 surface lens generatrix; the parameters include the curvature radius, the conic constant and the coordinates of each point;

[0157] A second mapping construction module is used to establish an energy mapping relationship between the incident light on the total reflection surface 122 of the lens portion 120 and the light exit surface based on the light intensity distribution of the light incident on the total reflection surface 122 of the lens portion 120 after the preliminary adjustment and the preset light exit surface;

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

[0160] The parameter determination device of the above-mentioned lighting assembly constructs the total reflection surface 122 of the lens portion 120 by determining the parameters of the total reflection surface 122 of the lens portion 120, thereby realizing the design of the cone portion 110 and the lens portion 120, and realizing the synergistic effect of refraction and total reflection to achieve precise 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 of view quality.

[0161] It should be noted that the above modules can be functional modules or program modules, and can be implemented through software or hardware. For modules implemented through hardware, the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0162] In one embodiment, an endoscope system is provided, which integrates any one of the lighting components for endoscopes in the above-mentioned embodiments, and the system also includes: a light guide and an endoscope; the endoscope includes a light inlet and a light outlet of the endoscope; the light guide is used to transmit light output by the light source to the lighting component; the light inlet of the endoscope is connected to the light outlet of the lighting component, and is used to receive light emitted by the light outlet of the lighting component; the endoscope is used to transmit the light received by the light inlet of the endoscope to the light outlet of the endoscope via the light guide fiber in the endoscope for emission, so as to observe the target area.

[0163] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), data processing logic devices based on quantum computing, and the like.

[0164] The technical features of the above embodiments can 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.

[0165] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A lighting assembly for an endoscope, characterized in that The lighting assembly includes a cone portion and a lens portion, wherein the cone portion and the lens portion are integrally formed; The cone portion includes a large-diameter end and a small-diameter end; the light-emitting surface of the lens portion includes a total reflection surface and a refraction surface; The large-diameter end of the cone portion is connected to the light-emitting surface of the light guide, and the small-diameter end of the cone portion is connected to the lens portion; The outgoing light of the guide beam enters the conical portion from the large-aperture end, is converged and the beam angle is adjusted by the conical portion, and then is emitted from the small-aperture end and enters the lens portion. A portion of the light beam entering the lens portion undergoes total internal reflection on the total reflection surface and reaches the light outlet of the lighting component, while the other portion undergoes refraction on the refractive surface and reaches the light outlet of the lighting component.

2. The lighting assembly for an endoscope according to claim 1, characterized in that The cone portion and the lens portion are both made of optical glass.

3. The lighting assembly for an endoscope according to claim 1, characterized in that: The side surface of the cone portion is coated with aluminum film or silver film; the total reflection surface of the lens portion is coated with aluminum film or silver film; And / or, the refractive surface of the lens portion is coated with an anti-reflection film.

4. The lighting assembly for an endoscope according to claim 1, wherein The lens portion further includes an oblique plane; The inclined plane is used to deflect the outgoing light from the total reflection surface to the light outlet of the lighting component.

5. The lighting assembly for an endoscope according to claim 1, characterized in that A microstructure layer is provided on the refractive surface and / or the total reflection surface of the lens portion; The microstructure layer is a microlens array or a diffractive optical element.

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

7. The method for determining parameters of a lighting assembly according to claim 6, wherein: Determining parameters of the refractive surface of the lens portion includes: Based on the light intensity distribution of the light incident on the refractive surface of the lens portion after preliminary adjustment and the preset light exit surface, an energy mapping relationship between the incident light on the refractive surface of the lens portion and the light exit surface is established; Based on the energy mapping relationship between the incident light on the refractive surface of the lens portion and the light exit surface, and a preset first lens generatrix reference point, the coordinates and normal vectors of all points on the generatrix of the first free-form surface lens are obtained using the Snell's law formula; the first free-form surface lens is the free-form surface lens corresponding to the refractive surface of the lens portion; Based on the coordinates and normal vectors of all points on the first free-form surface lens generatrix, the parameters of the refractive surface of the lens portion are determined; the parameters include the curvature radius, the cone constant and the coordinates of each point.

8. The method for determining parameters of a lighting assembly according to claim 6, wherein: Determining the parameters of the total reflection surface of the lens portion includes: Based on the light intensity distribution of the light incident on the total reflection surface of the lens portion after preliminary adjustment and the preset light exit surface, an energy mapping relationship between the incident light on the total reflection surface of the lens portion and the light exit surface is established; Based on the energy mapping relationship between the incident light on the total reflection surface of the lens portion and the light exit surface, and a preset second lens generatrix reference point, the coordinates and normal vectors of all points on the second free-form surface lens generatrix are obtained; the second free-form surface lens is the free-form surface lens corresponding to the total reflection surface of the lens portion; Based on the coordinates and normal vectors of all points on the second free-form surface lens generatrix, the parameters of the total reflection surface of the lens portion are determined.

9. The method for determining parameters of a lighting assembly according to claim 8, wherein: Before establishing an energy mapping relationship between the incident light on the total reflection surface of the lens portion and the light exit surface based on the light intensity distribution of the light incident on the total reflection surface of the lens portion after the preliminary adjustment and the preset light exit surface, the method includes: Based on the angle range requirement of the light exit angle at the light exit, the position of the light exit surface is adjusted to obtain the adjusted position of the light exit surface.

10. A device for determining parameters of a lighting assembly, used to implement the method for determining parameters of a lighting assembly according to any one of claims 6 to 9, characterized in that: The device comprises: a first parameter determination module, configured to determine a cone angle of the cone portion based on a radius of the large-aperture end and a radius of the small-aperture end of the cone portion, and a preset angle threshold of an outgoing light ray of the cone portion at the small-aperture end; A first mapping construction module is configured to establish an energy mapping relationship between the incident light on the refractive surface of the lens portion and the light exit surface based on the light intensity distribution of the light incident on the refractive surface of the lens portion after preliminary adjustment and a preset light exit surface; a first coordinate determination module, configured to obtain, based on an energy mapping relationship between the incident light on the refractive surface of the lens portion and the light exit surface, and a preset first lens generatrix reference point, the coordinates and normal vectors of all points on a first free-form surface lens generatrix using Snell's law; the first free-form surface lens being the free-form surface lens corresponding to the refractive surface of the lens portion; a second parameter determination module, configured to determine the parameters of the refractive surface of the lens portion based on the coordinates and normal vectors of all points on the generatrix of the first free-form surface lens; the parameters including the radius of curvature, the conic constant, and the coordinates of each point; a second mapping construction module, configured to establish an energy mapping relationship between the incident light on the total reflection surface of the lens portion and the light exit surface based on the light intensity distribution of the light incident on the total reflection surface of the lens portion after the preliminary adjustment and a preset light exit surface; a second coordinate determination module, configured to obtain the coordinates and normal vectors of all points on a second free-form surface lens generatrix based on an energy mapping relationship between the incident light and the light exit surface of the total reflection surface of the lens portion and a preset second lens generatrix reference point; the second free-form surface lens is a free-form surface lens corresponding to the total reflection surface of the lens portion; The third parameter determination module is used to determine the 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 surface lens generatrix.

11. An endoscope system, the system being integrated with the lighting assembly for an endoscope according to any one of claims 1 to 5, characterized in that: The system further comprises: a light guide, a light source host and an endoscope; the endoscope comprises a light inlet of the endoscope and a light outlet of the endoscope; The light guide is used to transmit the light output by the light source host to the lighting assembly; The light inlet of the endoscope is connected to the light outlet of the lighting assembly and is used to receive the light emitted by the light outlet of the lighting assembly; The endoscope is used to transmit the light received by the light inlet of the endoscope to the light outlet of the endoscope through the light-guiding fiber in the endoscope to observe the target area.

Images