An optical lens and a color analyzer

Abstract

The present application discloses an optical lens and a color analyzer, which are used to shorten the length of the optical lens and reduce the weight of the color analyzer. The optical lens of the present application is applied in the color analyzer. The color analyzer includes a housing and a conduction optical fiber inside it. The optical lens is connected to the housing and passes through the housing to form an optical path connection with the conduction optical fiber. The optical lens includes: a lens body, a lens assembly, and a diaphragm assembly; an incident end and an exit end are provided on the lens body, and the incident end and the exit end are connected through a light beam channel. The light beam channel is the channel for the light on the screen to be measured to be transmitted from the incident end to the exit end; the lens assembly is arranged in the light beam channel, and the lens assembly is used to converge the light to form an exit light beam with uniform intensity; the diaphragm assembly is arranged in the light beam channel, and the exit light beam irradiates on the front end face of the conduction optical fiber after passing through the diaphragm assembly. The plane where the exit light beam is focused is the rear focal plane, and the front end face of the conduction optical fiber is located in front of the rear focal plane.

Description

Technical Field

[0001] This application relates to the technical field of screen detection devices, and particularly to an optical lens and a color analyzer. Background Art

[0002] As a precision optical measurement device, a color analyzer is widely used in the tests of display screen brightness and color characteristics. It can accurately capture and analyze the light emitted by the display screen, so as to evaluate key parameters such as the brightness and chromaticity of the display screen. The color analyzer converges the light at the position of the display screen to be tested through an optical lens at the front end, and transmits it to the structure of the subsequent conducting optical fiber, CIE trichromatic filter and processing module for testing.

[0003] To ensure the effective convergence and conduction of light, the existing color analyzer places the optical fiber beam combining port at the rear focal plane of the optical lens to meet the requirement of precise alignment between the rear focal plane and the optical fiber beam combining port. However, this results in a relatively long length of the optical lens, making the overall length and weight of the color analyzer relatively large, which is not conducive to rapid deployment and flexible adjustment of the test position, and there is a problem of low portability. In addition, the increase in the weight of the color analyzer also affects the stability of the test, increasing the operation difficulty and error risk.

[0004] Based on this, this application proposes an optical lens and a color analyzer to solve the above technical problems. Summary of the Invention

[0005] To solve the above technical problems, this application provides an optical lens and a color analyzer, which can shorten the length of the optical lens and reduce the weight of the color analyzer.

[0006] In the first aspect of this application, an optical lens is provided, which is applied in a color analyzer. The color analyzer includes a housing and a conducting optical fiber located inside the housing. The optical lens is connected to the housing and forms an optical path transmission through the housing and the conducting optical fiber. The end face of the conducting optical fiber connected to the optical lens in the optical path is the front end face, and it includes:

[0007] A lens body, a lens assembly and a diaphragm assembly;

[0008] An incident end and an exit end are provided on the lens body, and the incident end and the exit end are connected through a beam channel. The beam channel is the channel for the light on the screen to be tested to be transmitted from the incident end to the exit end. The lens assembly is arranged in the beam channel, and the lens assembly is used to converge the light to form an evenly intense exit beam;

[0009] The diaphragm assembly is disposed within the beam path, and the output beam irradiates the front end face of the conducting optical fiber after passing through the diaphragm assembly. The plane where the output beam is focused is the rear focal plane. The front end face of the conducting optical fiber is located in front of the rear focal plane of the output beam, and the output beam forms a converging spot on the front end face of the conducting optical fiber.

[0010] Optionally, the lens assembly includes a first lens, a second lens, a third lens, and a fourth lens sequentially arranged along the light transmission direction.

[0011] Among them, the radius of curvature of the first lens is 40 mm.

[0012] The radius of curvature of the second lens is 40 mm.

[0013] The radius of curvature of the third lens is 25 mm.

[0014] The radius of curvature of the fourth lens is 20 mm.

[0015] Optionally, the first lens and the second lens, the second lens and the third lens, and the third lens and the fourth lens are respectively connected by gluing.

[0016] Optionally, the diaphragm assembly includes a first adjusting sleeve, an adjustable diaphragm, and an adjusting rod. The adjustable diaphragm is connected within the lens body. The first adjusting sleeve is sleeved outside the lens body. One end of the adjusting rod is connected to the adjusting plate of the adjustable diaphragm, and the other end passes through the lens body and is connected to the first adjusting sleeve. The first adjusting sleeve is controlled to rotate to adjust the aperture size of the adjustable diaphragm through the adjusting plate.

[0017] Optionally, the diaphragm assembly further includes a second adjusting sleeve and a slider. The second adjusting sleeve is sleeved outside the lens body. One end of the slider is connected to the adjustable diaphragm, and the other end passes through the lens body and is connected to the second adjusting sleeve. The second adjusting sleeve is used to adjust the movement of the adjustable diaphragm in a direction perpendicular to the rear focal plane.

[0018] Optionally, a through opening is provided on the lens body in a direction perpendicular to the rear focal plane. A plurality of card slots are provided on the side of the slider facing the second adjusting sleeve. The inner wall of the second adjusting sleeve is provided with threads, and the plurality of card slots pass through the opening and engage with the threads.

[0019] Optionally, the rear focal plane is located between the end face of the output end and the diaphragm assembly. The front end face of the conducting optical fiber passes through the housing and extends into the output end. The front end face of the conducting optical fiber is located between the rear focal plane and the diaphragm assembly.

[0020] Optionally, a threaded portion is provided on the outgoing end, and the outgoing end is connected to the housing through the threaded portion. The threaded portion is controlled to rotate to control the distance between the diaphragm assembly and the conduction optical fiber.

[0021] Optionally, a soft protective layer is provided on the incident end, and the soft protective layer is used to abut against the screen to be measured.

[0022] In a second aspect of the present application, a color analyzer is provided, including a housing, a conduction optical fiber, a trichromatic filter, a processing module, and the optical lens according to any one of the optional aspects in the first aspect. The conduction optical fiber, the trichromatic filter, and the processing module are all arranged in the housing. The optical lens is connected to the housing, and the optical lens penetrates the housing to form an optical path connection with the conduction optical fiber. The optical lens is used to converge the light on the screen to be measured to form an outgoing light beam with uniform intensity. The outgoing light beam converges on the end face of the conduction optical fiber. The end face of the conduction optical fiber near the optical lens is located in front of the rear focal plane. The front is the front where the outgoing light beam enters. The conduction optical fiber is used to guide the outgoing light beam to the trichromatic filter, so that the outgoing light beam reaches the processing module after passing through the trichromatic filter.

[0023] It can be seen from the above technical solutions that the present application has the following effects:

[0024] By providing a light beam channel to connect the incident end and the outgoing end of the lens body, the light beam channel is the channel for the light on the screen to be measured to be transmitted from the incident end to the outgoing end. The lens assembly is arranged in the light beam channel, and the lens assembly is used to converge the light to form an outgoing light beam with uniform intensity. The diaphragm assembly is arranged in the light beam channel, and the diaphragm assembly is located between the lens assembly and the rear focal plane of the outgoing light beam. The lens body is connected to the housing of the color analyzer through the outgoing end and forms an optical path connection with the conduction optical fiber inside it. The converged uniform light spot irradiates on the conduction optical fiber, and the end face of the conduction optical fiber near the optical lens is located between the rear focal plane and the diaphragm assembly. Therefore, compared with the prior art, in the present application, the position of the diaphragm is set before the rear focal plane, and the end face of the conduction optical fiber near the diaphragm assembly is also set before the rear focal plane, thereby shortening the length of the lens body, and further reducing the mass of the color analyzer and improving the portability of the color analyzer;

[0025] In addition, by converging the light on the screen to be measured into an outgoing light beam with uniform intensity through the lens assembly, the uniformity of the outgoing light beam is improved, thereby improving the measurement accuracy of the color analyzer. Description of the Drawings

[0026] To more clearly illustrate the technical solutions in the present application, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 A schematic diagram of an optical lens provided by the present application;

[0028] Figure 2 For Figure 1 A partial enlarged schematic diagram of the corresponding position of label A;

[0029] Figure 3 A schematic diagram of a variable aperture in an optical lens provided by the present application;

[0030] Figure 4 A schematic diagram of a first adjusting sleeve and a baffle in an optical lens provided by the present application;

[0031] Figure 5 A schematic diagram of a conductive optical fiber extending into the output end in an optical lens provided by the present application;

[0032] Figure 6 A schematic diagram of a color analyzer provided by the present application;

[0033] Figure 7 A schematic diagram of the formation of the output beam of the present application;

[0034] Lens body 01, lens assembly 02, aperture assembly 03, rear focal plane 04, conductive optical fiber 05, first lens 06, second lens 07, third lens 08, fourth lens 09, first adjusting sleeve 10, variable aperture 11, adjusting rod 12, second adjusting sleeve 13, slider 14, baffle 15, threaded portion 16, housing 17, trichroic filter 18, soft protective layer 19, processing module 20. Detailed implementation manners

[0035] In the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings, and is only used to illustrate the relative positional relationship between each component or part, and does not particularly limit the specific installation orientation of each component or part.

[0036] Moreover, in addition to being used to indicate orientation or positional relationship, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0037] In addition, the terms "install", "set", "provided with", "connect", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is an internal connection between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In addition, the structures, proportions, sizes, etc. shown in the drawings in this application are only used to cooperate with the content disclosed in the specification for those of ordinary skill in the art to understand and read, and are not used to limit the conditions for the implementation of this application. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that this application can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in this application.

[0039] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0040] This application provides an optical lens and a color analyzer, which are used to shorten the length of the optical lens and reduce the weight of the color analyzer. The specific implementation process of this application is described as follows.

[0041] Please refer to Figures 1 to 7 , an optical lens provided in the first aspect of this application is applied in a color analyzer. The color analyzer includes a housing 17 and a conductive optical fiber 05 located inside the housing 17. The optical lens is connected to the housing 17 and passes through the housing 17 to form an optical path connection with the conductive optical fiber 05. The end face of the conductive optical fiber 05 that is optically connected to the optical lens is the front end face. The optical lens includes:

[0042] Lens body 01, lens assembly 02 and diaphragm assembly 03; The lens body 01 is provided with an incident end and an exit end, and the incident end and the exit end are connected through a light beam channel. The light beam channel is the channel for the light on the screen to be measured to be transmitted from the incident end to the exit end; The lens assembly 02 is arranged in the light beam channel, and the lens assembly 02 is used to converge the light to form an exit light beam with uniform intensity; The diaphragm assembly 03 is arranged in the light beam channel. After passing through the diaphragm assembly 03, the exit light beam irradiates on the front end face of the conducting optical fiber 05. The plane where the exit light beam is focused is the rear focal plane 04. The front end face of the conducting optical fiber 05 is located in front of the rear focal plane of the exit light beam, and the exit light beam forms a converging light spot on the front end face of the conducting optical fiber.

[0043] Both ends of the lens body 01 are respectively an incident end and an exit end. The incident end and the exit end are connected through a light beam channel. The incident end is used to abut against the screen to be measured, and the exit end is used to connect with the conducting optical fiber 05 on the color analyzer. Thus, the light of the screen to be measured reaches the conducting optical fiber 05 after passing through the incident end, the light beam channel and the exit end.

[0044] A lens assembly 02 is arranged in the light beam channel. The lens assembly 02 is close to the incident end and is perpendicular to the principal optical axis of the incident light of the screen to be measured, so as to perform preliminary processing and focusing on the light entering the light beam channel. That is, the lens assembly 02 is responsible for converging the light of the screen to be measured to form an exit light beam with uniform intensity. The exit light beam is located in the light beam channel and between the lens assembly 02 and the conducting optical fiber 05. The exit light beam is in a converging state in the light beam channel. The plane where the exit light beam is focused is the rear focal plane 04. The rear focal plane 04 is perpendicular to the principal optical axis of the exit light beam. The exit light beam irradiates on the front end face of the conducting optical fiber 05, forming a uniform converging light spot on the front end face. The converging light spot helps the light enter the conducting optical fiber 05 more efficiently, reducing the loss and scattering of the light, thereby improving the measurement accuracy of the color analyzer.

[0045] The diaphragm assembly 03 is arranged in the light beam channel, and the diaphragm assembly 03 is arranged between the lens assembly 02 and the rear focal plane 04 of the exit light beam. The diaphragm assembly 03 is used to limit the light passing aperture of the exit light beam to control the direction and range of the exit light beam, thereby optimizing the imaging quality. The aperture of the diaphragm in the diaphragm assembly 03 can be fixed or adjustable. The selected diaphragm in the diaphragm assembly 03 can be an aperture diaphragm or a field diaphragm.

[0046] The conductive optical fiber 05 is located inside the housing 17. The lens body 01 is connected to the housing 17, and the connection can be achieved by snap connection or threaded connection. The housing 17 is provided with a through connection port at the connection with the lens body 01. An optical path connection is formed between the lens body 01 and the conductive optical fiber 05, that is, the light beam can be transmitted between the lens body 01 and the conductive optical fiber 05. Thus, the outgoing light beam formed by the lens assembly 02 reaches the end face of the conductive optical fiber 05. This end face is the end face (front end face) of the conductive optical fiber 05 close to the lens body 01. The front end face is located between the aperture stop assembly 03 and the rear focal plane 04. The aperture size of the aperture in the aperture stop assembly 03 matches the cross-sectional size of the end of the conductive optical fiber 05, ensuring that the outgoing light beam covers the end of the conductive optical fiber 05.

[0047] It should be noted that the end face of the conductive optical fiber 05 does not coincide with the rear focal plane 04.

[0048] In this embodiment, first, the lens assembly 02 is arranged in the light beam channel of the lens body 01. After the light on the screen to be measured passes through the lens assembly 02 in the light beam channel, an outgoing light beam with uniform intensity is formed. The aperture stop assembly 03 and the end face of the conductive optical fiber 05 are both arranged in front of the rear focal plane 04 of the outgoing light beam. Compared with the prior art where the conductive optical fiber is arranged on the rear focal plane 04, in this application, the aperture stop assembly 03 and the end of the conductive optical fiber 05 are moved forward towards the lens assembly 02, which can shorten the length of the lens body 01, reduce the total mass of the lens, and further reduce the total mass of the color analyzer, improving portability.

[0049] In addition, the outgoing light beam with uniform intensity means that the light intensity on the outgoing light beam remains consistent in all directions without significant differences in strength. The realization of the outgoing light beam with uniform intensity improves the uniformity of the outgoing light beam entering the port of the conductive optical fiber 05, thereby improving the measurement accuracy of the color analyzer. By irradiating the end of the conductive optical fiber 05 with the outgoing light beam with uniform intensity, the outgoing light beam is transmitted to the color analyzer through the conductive optical fiber 05. Thus, the color analyzer can accurately capture the color information in all directions, avoiding color distortion or deviation caused by uneven light intensity. The outgoing light beam with uniform intensity formed by convergence is as Figure 7 shown.

[0050] In an alternative embodiment, the lens assembly 02 includes a first lens 06, a second lens 07, a third lens 08, and a fourth lens 09 arranged in sequence along the light transmission direction. Among them,

[0051] The radius of curvature of the first lens 06 is 40 mm for both.

[0052] The radius of curvature of the second lens 07 is 40 mm for both.

[0053] The curvature radius of the third lens 08 is 25 mm;

[0054] The curvature radius of the fourth lens 09 is 20 mm.

[0055] In a specific implementation, other parameters of the lens assembly 02 are: the thickness of the first lens 06 is 7 mm, and the refractive index is 1.5168; the thickness of the second lens 07 is 2.5 mm, and the refractive index is 1.7231; the thickness of the third lens 08 is 1.2 mm, and the refractive index is 1.53; the thickness of the fourth lens 09 is 5 mm, and the refractive index is 1.712.

[0056] In this embodiment, each lens in the lens assembly 02 is set with special parameters to achieve accurate convergence and correction of light. The coordinated work between the lenses can reduce the generation of aberrations and distortions and improve the imaging quality and stability of the lens.

[0057] The first lens 06 is used to receive the light from the screen to be tested, and to preliminarily refract and focus the light. The first lens 06 uses a larger curvature radius (40mm) and a moderate refractive index (1.5168) to help maintain the stability and directionality of the light and reduce the scattering and loss of the light when it enters the lens assembly 02. At the same time, the first lens 06 is set to a thicker thickness (7mm) to provide sufficient refraction effect, so that the light can be preliminarily converged, which is convenient for further correction and convergence of the subsequent three lenses.

[0058] The second lens 07 is located behind the first lens 06 along the light transmission direction. The second lens 07 is used to further adjust the direction of the light and achieve the initial convergence of the light together with the first lens 06. The curvature radius of the second lens 07 is the same as that of the first lens 06 (40mm), which can maintain the stability and directionality of the light; the second lens 07 uses a higher refractive index (1.7231) and a thinner thickness (2.5mm) so that the light can be refracted more accurately when passing through the second lens 07, further reducing scattering and absorption, and improving the light transmission performance of the optical lens.

[0059] The third lens 08 is set with a smaller curvature radius (25mm) and a moderate refractive index (1.53) so that the light will be refracted more violently when passing through the third lens 08, thereby further converging the light. At the same time, the thinner thickness (1.2mm) can reduce the loss of light and has the effect of precise refraction and convergence.

[0060] The fourth lens 09 is used to adjust the direction of light, ensuring that the light can be precisely converged onto the rear focal plane 04 to form an outgoing light beam with uniform intensity. The fourth lens 09 is set with the smallest radius of curvature (20 mm) and a relatively high refractive index (1.712), enabling the light to undergo the final precise refraction when passing through the fourth lens 09, further reducing the generation of aberrations and distortions. The appropriate thickness (5 mm) ensures that the fourth lens 09 has sufficient refractive power to facilitate the formation of a high-quality outgoing light beam.

[0061] In this alternative embodiment, the first lens 06 and the second lens 07, the second lens 07 and the third lens 08, and the third lens 08 and the fourth lens 09 are respectively connected by gluing.

[0062] The material used for gluing can be optical clear adhesive, also known as optical UV glue, which has excellent transparency and refractive index consistency, ensuring that the light is not significantly affected during the transmission between the lenses; it can also be optical epoxy resin, which also has the advantages of high strength, high transparency, and good weather resistance.

[0063] In this embodiment, adjacent lenses are adhered together by gluing to form a more compact and stable lens assembly 02, which can ensure the precise alignment between adjacent lenses, while reducing the light refraction and scattering caused by air gaps, thereby improving the overall performance of the optical lens of this application. Secondly, it can reduce the loss of light between the lenses and maintain the stability and consistency of the light. Additionally, it helps to improve the anti-vibration and anti-shock capabilities of the optical lens of this application.

[0064] In an alternative embodiment, the aperture assembly 03 includes a first adjusting sleeve 10, an adjustable aperture 11, and an adjusting rod 12. The adjustable aperture 11 is connected inside the lens body 01. The first adjusting sleeve 10 is sleeved outside the lens body 01. One end of the adjusting rod 12 is connected to the adjusting plate of the adjustable aperture 11, and the other end passes through the lens body 01 and is connected to the first adjusting sleeve 10. The first adjusting sleeve 10 is controlled to rotate to adjust the aperture size of the adjustable aperture 11 through the adjusting plate.

[0065] To adapt to conductive optical fibers 05 with different cross-sectional sizes, the aperture size of the diaphragm assembly 03 needs to be adjusted. Therefore, in this embodiment, the diaphragm assembly 03 is composed of a first adjusting sleeve 10, an adjustable diaphragm 11, and an adjusting rod 12. The adjustable diaphragm 11 is fixed in the beam channel of the lens body 01. A perforation is provided on the lens body 01, and the adjusting sleeve is arranged outside the perforation. The adjusting rod 12 passes through the perforation and is connected to the adjusting plate on the adjustable diaphragm 11. When the first adjusting sleeve 10 rotates, it can drive the adjusting plate on the adjustable diaphragm 11 to rotate through the adjusting rod 12. When the adjusting plate rotates, the aperture size of the adjustable diaphragm 11 can be adjusted, and the size of the outgoing beam passing through the adjustable diaphragm 11 can be adjusted, so that the cross-sectional size of the outgoing beam after passing through the adjustable diaphragm 11 matches the cross-sectional size of the conductive optical fiber 05.

[0066] Please continue to refer to Figure 1 and Figure 2 , Figure 2 FIG. is a schematic diagram of the cooperation between the second adjusting sleeve 13 and the slider 14. In this alternative embodiment, the diaphragm assembly 03 further includes a second adjusting sleeve 13 and a slider 14. The second adjusting sleeve 13 is sleeved outside the lens body 01. One end of the slider 14 is connected to the adjustable diaphragm 11, and the other end passes through the lens body 01 and is connected to the adjusting sleeve. The adjusting sleeve is used to adjust the movement of the adjustable diaphragm 11 in a direction perpendicular to the rear focal plane 04.

[0067] In actual use, at the position of the adjustable diaphragm 11, if the maximum light-passing aperture of the adjustable diaphragm 11 is larger than the cross-sectional size of the outgoing beam at this position, increasing the light-passing aperture of the adjustable diaphragm 11 at this time cannot increase the cross-sectional size of the outgoing beam. For example, at the position of the adjustable diaphragm 11, the maximum cross-section of the outgoing beam is 5 cm in diameter, while at this position, the maximum aperture of the light-passing aperture of the adjustable diaphragm 11 is 7 cm in diameter. Therefore, when a conductive optical fiber 05 with a cross-section of 6 cm in diameter appears, continuing to increase the light-passing aperture cannot increase the cross-sectional size of the outgoing beam.

[0068] Based on this, the diaphragm assembly 03 of this embodiment further includes a second adjusting sleeve 13 and a slider 14. The second adjusting sleeve 13 is also sleeved outside the lens body 01. The outer diameter of the second adjusting sleeve 13 is the same as that of the first adjusting sleeve 10. The second adjusting sleeve 13 is connected to the adjustable diaphragm 11 through the slider 14. When the second adjusting sleeve 13 rotates, it is used to adjust the distance between the slider 14 on the lens body 01 and the lens assembly 02, so as to realize the adjustment of the movement of the adjustable diaphragm 11 in the beam channel.

[0069] The adjustable diaphragm 11 is connected to the first adjusting sleeve 10 and the adjusting rod 12. Therefore, when the adjustable diaphragm 11 moves horizontally (the moving path is parallel to the light transmission path), the first adjusting sleeve 10 and the adjusting rod 12 also move accordingly. At this time, the length of the perforation provided is the same as the path length of the horizontal movement of the adjustable diaphragm 11. To prevent external dust from entering the lens body 01 through this perforation, a baffle 15 is provided inside the lens body 01. The baffle 15 is connected to the first adjusting sleeve 10. When the first adjusting sleeve 10 rotates, the baffle 15 can block the perforation. At the same time, when the adjustable diaphragm 11 and the first adjusting sleeve 10 move horizontally, the baffle 15 also blocks the perforation, thereby achieving the effect of preventing dust from entering the lens body 01.

[0070] In this alternative embodiment, an opening extending through is provided on the lens body 01 in a direction perpendicular to the rear focal plane 04. The opening is located on the side surface of the lens body 01. A number of card slots are provided on the side of the slider 14 facing the second adjusting sleeve 13. The inner wall of the second adjusting sleeve 13 is provided with threads, and the number of card slots pass through the opening and engage with the threads.

[0071] In realizing the horizontal movement of the adjustable diaphragm 11, one end of the slider 14 is fixedly connected to the adjustable diaphragm 11. When the second adjusting sleeve 13 rotates, through the cooperation of the threads and the number of card slots, the slider 14 moves horizontally as a whole, thereby realizing the position adjustment of the adjustable diaphragm 11.

[0072] In an alternative embodiment, an annular groove is provided in the beam channel for clamping the lens assembly 02. In the way of fixing the lens assembly 02, specifically, an annular groove is provided in the beam channel. The annular groove is integrally formed with the lens body 01 and is a part of the lens body 01. The outer edge of the lens assembly 02 is clamped into the annular groove, and the fixing of the lens assembly 02 can be realized, thereby avoiding the situation of the lens assembly shifting in position.

[0073] The above describes the situation where the entire conduction optical fiber 05 is inside the housing 17. In this case, the rear focal plane 04 formed by the outgoing light beam needs to be inside the housing 17 and behind the end face of the conduction optical fiber 05. In another alternative embodiment, the rear focal plane 04 is located between the end face of the outgoing end and the diaphragm assembly 03 (the part of the lens body 01 located behind the diaphragm assembly 03 is called the outgoing end). At this time, the front end face of the conduction optical fiber 05 extends into the outgoing end, and the front end face of the conduction optical fiber 05 is in front of the rear focal plane 04. The front end face of the conduction optical fiber 05 is located between the rear focal plane 04 and the diaphragm assembly 03, and this front end face does not coincide with the rear focal plane 04.

[0074] Please continue to refer to Figure 6, in an optional embodiment, a threaded portion 16 is provided on the exit end. The threaded portion 16 is connected to the housing 17. The exit end is controlled to rotate through the threaded portion 16 to control the distance between the diaphragm assembly 03 and the conduction optical fiber 05. In this embodiment, the lens body 01 is screwed to the housing 17 through the threaded portion 16 on the exit end. The threaded portion 16 is provided with external threads, and the connection port on the housing 17 is provided with internal threads, and the internal threads match the external threads. In actual use, for color analyzers of different specifications, the positions of the ends of the conduction optical fiber 05 are inconsistent (the lengths from the connection port are different). Therefore, to ensure that the rear focal plane is always behind the end of the conduction optical fiber 05 (along the transmission direction of the outgoing light beam, the incoming direction is the front and the outgoing direction is the rear), the threaded portion 16 is provided. By controlling the screwing depth of the threaded portion 16 into the housing 17, the rear focal plane 04 is controlled to move in the light beam transmission direction.

[0075] In an optional embodiment, a soft protective layer 19 is provided on the incident end. The soft protective layer 19 is used to abut against the screen to be measured. The soft protective layer 19 is used to protect the screen to be measured and reduce the wear on the screen to be measured. The soft protective layer 19 can be made of materials such as rubber and silica gel.

[0076] In addition, to protect the lens assembly 02, a protective lens can be provided between the soft protective layer 19 and the lens assembly 02. The protective lens has a fully light-transmissive property (does not block light). By providing the protective lens, substances such as dust and moisture are prevented from entering the light beam channel, which can not only protect the lens assembly 02 but also reduce the influence on the measurement results.

[0077] Please continue to refer to Figures 5 - 6 , the second aspect of the present application provides a color analyzer, including a housing 17, a conduction optical fiber 05, a trichromatic filter 18, a processing module 20, and the optical lens in any of the above embodiments. The conduction optical fiber 05, the trichromatic filter 18, and the processing module 20 are all arranged in the housing 17. The optical lens is connected to the housing 17. The optical lens penetrates the housing 17 to form an optical path connection with the conduction optical fiber 05. The optical lens is used to converge the light on the screen to be measured to form an outgoing light beam with uniform intensity. The outgoing light beam converges on the end face of the conduction optical fiber 05. The end face of the end of the conduction optical fiber 05 close to the optical lens is in front of the rear focal plane 04. This front represents the front of the incoming outgoing light beam. The conduction optical fiber 05 is used to guide the outgoing light beam into the trichromatic filter 18, so that the outgoing light beam reaches the processing module 20 after passing through the trichromatic filter 18.

[0078] The light beam entering through the conduction optical fiber 05 reaches the processing module 20 after passing through the trichromatic filter 18, and the processing module 20 detects and analyzes these light beams.

[0079] The optical lens adopted by the color analyzer of the present application shortens the length of the optical lens by arranging the diaphragm assembly 03 and the end of the conduction optical fiber 05 before the rear focal plane 04, thereby reducing the weight of the optical lens, and further reducing the weight of the color analyzer and improving the portability.

[0080] In addition, since the optical lens adopts a lens assembly 02 formed by combining 4 lenses with specific parameters, the lens assembly 02 can converge the light on the screen to be measured to form an outgoing light beam, and the light intensity of the outgoing light beam remains consistent in all directions without significant differences in strength. Therefore, a uniform converging light spot is formed on the end face of the conduction optical fiber by the outgoing light beam, thereby improving the uniformity of the outgoing light beam entering the port of the conduction optical fiber 05, and thus improving the accuracy of the color analyzer.

[0081] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An optical lens, applied in a color analyzer, the color analyzer comprising a housing and a transmission optical fiber located inside the housing, the optical lens being connected to the housing and penetrating the housing to form an optical path connection with the transmission optical fiber, the end face of the transmission optical fiber connected to the optical path of the optical lens being a front end face, characterized in that: The optical lens comprises: a lens body, a lens assembly and an aperture assembly; The lens body is provided with an incident end and an exit end, the incident end and the exit end are connected through a beam channel, and the beam channel is a channel for the light on the screen to be measured to be transmitted from the incident end to the exit end; the lens assembly is arranged in the beam channel, and the lens assembly is used to converge the light to form an exit beam with uniform intensity; The aperture assembly is arranged in the beam channel, the outgoing beam is irradiated on the front end face of the transmission optical fiber after passing through the aperture assembly, the plane on which the outgoing beam is focused is the back focal plane, the front end face of the transmission optical fiber is located in front of the back focal plane of the outgoing beam, and the outgoing beam forms a converging spot on the front end face of the transmission optical fiber; The lens assembly comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along the light transmission direction; Wherein, the curvature radius of the first lens is 40 mm; The curvature radius of the second lens is 40 mm; The curvature radius of the third lens is 25 mm; The curvature radius of the fourth lens is 20 mm.

2. The optical lens according to claim 1, characterized in that: The first lens and the second lens, the second lens and the third lens, and the third lens and the fourth lens are connected by gluing.

3. The optical lens according to claim 1 or 2, characterized in that: The aperture assembly includes a first adjustment sleeve, an adjustable aperture and an adjustment rod. The adjustable aperture is connected inside the lens body, and the first adjustment sleeve is arranged outside the lens body. One end of the adjustment rod is connected to the adjustment plate of the adjustable aperture, and the other end passes through the lens body and is connected to the first adjustment sleeve. The first adjustment sleeve is controlled to rotate to adjust the aperture size of the adjustable aperture through the adjustment plate.

4. The optical lens according to claim 3, characterized in that: The aperture assembly also includes a second adjustment sleeve and a slider. The second adjustment sleeve is arranged outside the lens body. One end of the slider is connected to the adjustable aperture, and the other end passes through the lens body and is connected to the second adjustment sleeve. The second adjustment sleeve is used to adjust the adjustable aperture to move in a direction perpendicular to the rear focal plane.

5. The optical lens according to claim 4, characterized in that: The lens body is provided with a through opening in a direction perpendicular to the rear focal plane, the sliding block is provided with a plurality of slots on a side facing the second adjustment sleeve, the inner wall of the second adjustment sleeve is provided with threads, and the plurality of slots pass through the opening and engage with the threads.

6. The optical lens according to claim 1 or 2, characterized in that: The rear focal plane is located between the terminal end face of the emission end and the aperture assembly, the front end face of the transmission optical fiber passes through the housing and extends into the emission end, and the front end face of the transmission optical fiber is located between the rear focal plane and the aperture assembly.

7. The optical lens according to claim 1 or 2, characterized in that: The emission end is provided with a threaded portion, the emission end is connected to the housing via the threaded portion, and the controlled rotation of the threaded portion is used to control the distance between the aperture assembly and the transmission optical fiber.

8. The optical lens according to claim 1 or 2, characterized in that: A soft protective layer is arranged on the incident end, and the soft protective layer is used to abut against the screen to be tested.

9. A color analyzer, characterized in that: It comprises a shell, a transmission optical fiber, a three-color filter, a processing module and an optical lens according to any one of claims 1 to 8, wherein the transmission optical fiber, the three-color filter and the processing module are all arranged in the shell, the optical lens is connected to the shell, the optical lens penetrates the shell to form an optical path connection with the transmission optical fiber, the optical lens is used to converge the light on the screen to be measured to form an outgoing light beam with uniform intensity, the outgoing light beam converges at the end face of the transmission optical fiber, the end face of one end of the transmission optical fiber close to the optical lens is located in front of the rear focal plane, the front is the front of the outgoing light beam entering, and the transmission optical fiber is used to guide the outgoing light beam to the three-color filter, so that the outgoing light beam reaches the processing module after passing through the three-color filter.

Images