A lens fiber array coupling system and a colorimetric measurement system

Abstract

The utility model provides a kind of lens optical fiber array coupling system and colorimetric measurement system, belong to colorimetric measurement field, lens optical fiber array coupling system includes: imaging component, the imaging component includes imaging lens, for obtaining the incident light of measured object, and it is guided to array optical fiber;Array optical fiber, the end face of array optical fiber is located the first image surface of imaging component, the normal line of at least part optical fiber end face in array optical fiber has deflection angle relative to the normal line of first image surface, the deflection angle is angle deflection with the chief ray of light received in corresponding optical fiber position as target reference;Imaging spectrometer, for receiving the light ray information sent by array optical fiber.The utility model is by setting the deflection angle of array optical fiber, so that optical fiber effective receiving area maximization, and eliminate the wavelength dependency refraction caused by light oblique incidence.

Description

Technical Field

[0001] This utility model relates to the field of colorimetric measurement technology, specifically to a lens fiber array coupling system and a colorimetric measurement system. Background Technology

[0002] In the field of display testing, a spectrophotometer (or spectroradiometer, spectral colorimeter) is a crucial precision measuring instrument. It is primarily used for high-precision, quantitative testing and analysis of the brightness, chromaticity, and other color characteristics of various display devices (such as LCD, OLED, MicroLED, MiniLED, etc.) before they leave the factory. This ensures the accuracy of color reproduction and visual quality of display products, meeting industry standards and user expectations. As display technology advances towards higher resolution and higher contrast, higher demands are placed on the measurement accuracy and multi-channel capabilities of colorimeters.

[0003] One current technique for spectrophotometers involves splitting the incident light into two paths using a beam splitter. A multi-point spectrometer measures one path, acquiring spectral information from several specific locations on the display screen. A field-array camera acquires the other path, obtaining chromaticity information from each point. The spectral information from these specific points is then used to calibrate the remaining points. Figure 1 As shown, the multi-point spectrometer and CMOS sensor can interchange positions, allowing the acquisition of either transmitted or reflected light. In this technique, the fiber optic axis is typically parallel to the imaging system's optical axis, such as... Figure 2 As shown (the beam splitter is omitted here). This method has the following drawbacks: Except for the central fiber (such as fiber 2), the end faces of the other fibers have a certain incident angle with their main rays (such as fiber 3). On the one hand, the oblique incidence of the fiber reduces the effective receiving area of ​​the light, which will reduce the fiber-to-fiber receiving efficiency. On the other hand, if a single fiber itself is incident at an angle, it will cause the transmission efficiency of light in different wavelength bands to change. Utility Model Content

[0004] This invention provides a colorimetric measurement system and method based on an array of optical fibers, which addresses at least one deficiency in the prior art.

[0005] In a first aspect, this utility model provides a lens fiber array coupling system, the system comprising: An imaging component, comprising an imaging lens for acquiring incident light from the object under test and guiding it to an array of optical fibers; An array of optical fibers, wherein the end face of the array of optical fibers is located on the first image plane of the imaging component, and the normal of at least a portion of the end face of the optical fibers in the array of optical fibers has a deflection angle relative to the normal of the first image plane, wherein the deflection angle is an angle deflection with the principal ray of the light received at the corresponding optical fiber position as the target reference. An imaging spectrometer is used to receive light information transmitted by the array of optical fibers.

[0006] According to the lens fiber array coupling system provided by this utility model, the imaging component further includes a relay lens group, which is located between the imaging lens and the array fiber, and is used to change the incident light rays passing through the imaging lens and guide them to the array fiber. According to the lens fiber array coupling system provided by this utility model, at least a portion of the fiber end faces in the array fiber have a deflection angle relative to the normal of the first image plane. Specifically, the array fiber has a central fiber, and the normal of the end face of the central fiber coincides with the normal of the first image plane; except for the central fiber, the other fibers have a deflection angle, which causes the normal of the fiber end face to coincide with the principal ray of the light received at the corresponding fiber position.

[0007] According to the lens fiber array coupling system provided by this utility model, at least a portion of the fiber end faces in the array fiber have a deflection angle relative to the normal of the first image plane, specifically: The array of optical fibers does not have a central fiber; all fibers have a deflection angle such that the normal to the end face of the fiber coincides with the principal ray of the light received at the corresponding fiber position.

[0008] The lens fiber array coupling system provided by this utility model also includes a fiber fixing component, which has a plurality of angled holes, and the array fiber is mounted on the fiber fixing component through the holes.

[0009] According to the lens fiber array coupling system provided by this utility model, at least a portion of the optical fiber includes fiber N. i The optical fiber N i The deflection angle satisfies θ i =arctan(h i / f), where h i For fiber N i The corresponding image height, where f is the lens focal length.

[0010] Secondly, this utility model provides a colorimetric measurement system, which includes the lens fiber array coupling system described above, and further includes: a beam splitter, an array fiber, and an image sensor; The beam splitter is located between the imaging lens and the array fiber, and is used to partially reflect and partially transmit the incident light, so that the incident light is split into a first part of light and a second part of light. The arrayed optical fiber, with its end face located on the first image plane of the imaging component, is used to receive a portion of the first portion of light and transmit it to the imaging spectrometer. The imaging spectrometer is used to obtain the first color information of the object under test based on the received light information; The image sensor is used to receive the second portion of light and acquire the second color information of the object under test.

[0011] According to the colorimetric measurement system provided by this utility model, the array of optical fibers is arranged in two dimensions and symmetrically distributed, and is used to simultaneously acquire spectral information from multiple different specific locations on the object under test.

[0012] According to the colorimetric measurement system provided by this utility model, the object to be measured is uniformly and virtually divided into multiple measurement regions. Each optical fiber in the array is located at a position corresponding to the center point of the multiple measurement regions, and is used to obtain the spectral information of the center position of each measurement region.

[0013] This invention provides a lens fiber array coupling system and a colorimetric measurement system. By making the normal of at least a portion of the fiber end face in the array fiber deflected relative to the normal of the first image plane of the imaging component, the deflection angle is an angular deflection with the principal ray of the light received at the corresponding fiber position as the target reference, thereby increasing the effective receiving area of ​​the fiber and greatly improving the light flux of the edge field of view.

[0014] Furthermore, this invention sets a deflection angle for all optical fibers except the central fiber, so that the optical axis of each optical fiber coincides with the principal ray of the light received at the corresponding optical fiber position. That is, the principal ray of the light received at the optical fiber position is perpendicularly incident on the end face of the optical fiber. In this way, the effective receiving area of ​​the optical fiber is maximized, and wavelength-dependent refraction caused by oblique incidence is eliminated.

[0015] Furthermore, this invention secures the array of optical fibers by using an optical fiber fastener with multiple angled holes, thereby ensuring the accuracy of the optical fiber deflection angle.

[0016] Furthermore, this invention improves the light-gathering efficiency of the fiber optic array by adding a relay lens group between the lens and the optical fiber array. The relay lens group is used to change the light emitted by the imaging lens from the object under test and send it to the optical fiber array. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a colorimetric measurement system in the prior art; Figure 2 This is a schematic diagram of a lens fiber array coupling system in the prior art; Figure 3 This is a schematic diagram of a lens fiber array coupling system according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the optical path of a colorimetric measurement system according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the optical path of a colorimetric measurement system according to another embodiment of this utility model; Figure 6 This is a schematic diagram of the virtual division of the test area provided by this utility model. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] It should be noted that in the description of the embodiments of this utility model, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more.

[0022] The following is combined with Figures 3-6 This invention describes the lens fiber array coupling system, colorimetric measurement system, and method provided in the embodiments of the present invention.

[0023] This utility model provides a specific embodiment of a lens fiber optic array coupling system. For example... Figure 3 As shown, the lens fiber array coupling system includes: An imaging assembly includes an imaging lens for acquiring incident light from the object under test and guiding it to an array of optical fibers; an array of optical fibers, the end face of which is located on a first image plane of the imaging assembly, wherein the normal of at least a portion of the end face of the array of optical fibers has a deflection angle relative to the normal of the first image plane, the deflection angle being an angular deflection with the principal ray of light received at the corresponding optical fiber position as the target reference; and an imaging spectrometer for receiving light information transmitted by the array of optical fibers.

[0024] Figure 3 In this system, the imaging component is an imaging lens, which has a first image plane. The array fiber consists of three fibers: fiber 1, fiber 2, and fiber 3. The array fiber is located on the first image plane of the imaging lens, and the three fibers are positioned at specific locations on the first image plane to simultaneously receive light information from points A, B, and C on the object under test, where B is the center point of the object. The system has an optical axis OA, which is also the normal to the first image plane. Fiber 2 is the central fiber, and its optical axis coincides with the optical axis of the entire imaging system. It is used to acquire light information from the center point B of the object under test. For fiber 2, the principal ray of light entering fiber 2 is along the optical axis OA. This principal ray is perpendicular to the end face of fiber 2; therefore, fiber 2 can maximize the reception of light from the center point B without angular deflection.

[0025] For optical fiber 1 and optical fiber 3, they are edge optical fibers and need angular deflection to ensure the effective receiving area of the optical fibers. Taking optical fiber 1 as an example, optical fiber 1 is configured to acquire light information at point C of the object to be measured. The chief ray received at the position of optical fiber 1 is the ray OC passing through the center point of the imaging lens. If the end face of optical fiber 1 is parallel to the end face of optical fiber 2, then the chief ray OC will form an acute angle with the end face of optical fiber 1, that is, the chief ray OC of optical fiber 1 has an incident angle, which will cause changes in the light transmission efficiency of different wavelength bands. Meanwhile, since the chief ray OC of optical fiber 1 is obliquely incident, the effective receiving area of light is reduced, thereby lowering the response efficiency of the system. Therefore, angular deflection is required for optical fiber 1.

[0026] Specifically, the normal line OB of the end face of optical fiber 1 has a deflection angle relative to the normal line OA of the first image plane, and this deflection angle is an angular deflection performed with the chief ray OC of the received light at the position of optical fiber 1 as the target reference. That is, the deflection objective of optical fiber 1 is to make the normal line OB of the end face of optical fiber 1 approximately coincide or directly coincide with the chief ray OC of the received light at the position of optical fiber 1. At this time, the deflection angle between the normal line OB of the end face of optical fiber 1 and the optical axis OA of the imaging system satisfies 0 < θ1 ≤ arctan(h1 / f), wherein h1 is the image height of optical fiber 1, and f is the focal length of the lens. When 0 < θ1 < arctan(h1 / f), although the normal line OB of the end face of optical fiber 1 does not coincide with the chief ray OC of the received light at the position of optical fiber 1, compared with the situation where optical fiber 1 is not deflected, the effective receiving area of the optical fiber can already be increased. When θ1 = arctan(h1 / f), the normal line OB of the end face of optical fiber 1 coincides with the chief ray OC of the received light at the position of optical fiber 1, and at this time, optical fiber 1 can receive incident light at this position to the maximum extent. Similarly, optical fiber 3 can also have a deflection angle, and the deflection angle thereof satisfies 0 < θ3 ≤ arctan(h3 / f), wherein h3 is the image height of optical fiber 3, and f is the focal length of the lens. Preferably, θ3 = arctan(h3 / f). By performing angular deflection on the edge optical fibers, the problem of oblique incidence of the chief ray of received light at the position of the optical fiber is avoided, thereby greatly increasing the effective receiving area of light and eliminating the wavelength-dependent refraction caused by oblique incidence.

[0027] After the arrayed optical fibers acquire the light information at each position, they send the light information to an imaging spectrometer, and the imaging spectrometer acquires the spectral information or first color information of the object to be measured according to the received light information.

[0028] It should be noted that the imaging assembly further comprises a relay lens group, wherein the relay lens group is located between the imaging lens and the arrayed optical fibers, and is configured to adjust incident rays passing through the imaging lens and guide the incident rays to the arrayed optical fibers, thereby improving the light receiving efficiency of the optical fibers. At this time, the first image plane is a new image plane formed after the relay lens group is added.

[0029] In another embodiment, the array of optical fibers has a central fiber, the normal of the end face of which coincides with the normal of the first image plane; the other optical fibers, besides the central fiber, have deflection angles such that the normal of the end face of the fiber coincides with the principal ray of the light received at the corresponding fiber position. Figure 4 As shown, fiber 2 is the central fiber, which has no deflection angle because the normal of its end face coincides with the principal ray of the light received at that position. However, fibers 1 and 3 both have deflection angles. The deflection angle of fiber 1 causes the normal of its end face to coincide with the principal ray of the light received at that position. The deflection angle of fiber 3 causes the normal of its end face to coincide with the principal ray of the light received at that position.

[0030] In another embodiment, the array of optical fibers does not have a central fiber; all fibers have a deflection angle such that the normal to the end face of the fiber coincides with the principal ray of the light received at the corresponding fiber position. In this embodiment, fiber 2 is not present; only fiber 1 and fiber 3 are present. Fiber 1 and fiber 3 both have deflection angles. The deflection angle of fiber 1 causes the normal to the end face of fiber 1 to coincide with the principal ray of the light received at fiber 1 position, and the deflection angle of fiber 3 causes the normal to the end face of fiber 3 to coincide with the principal ray of the light received at fiber 3 position.

[0031] In another embodiment, the system further includes an optical fiber fixing component having multiple angled holes through which one end of the arrayed optical fiber is mounted. This fixing component ensures the deflection accuracy of the optical fiber.

[0032] This utility model also provides a specific embodiment of a colorimetric measurement system, which includes the aforementioned lens fiber optic coupling system.

[0033] The colorimetric measurement system also includes: a beam splitter, an array of optical fibers, and an image sensor; The beam splitter is located between the imaging lens and the array fiber, and is used to partially reflect and partially transmit the incident light, so that the incident light is split into a first part of light and a second part of light. The arrayed optical fiber, with its end face located on the first image plane of the imaging component, is used to receive a portion of the first portion of light and transmit it to the imaging spectrometer. The imaging spectrometer is used to obtain the first color information of the object under test based on the received light information; The image sensor is used to receive the second portion of light and acquire the second color information of the object under test.

[0034] like Figure 4 As shown, the beam splitter is a beam splitter, the imaging component is an imaging lens, and the array fiber is located on the first image plane of the imaging lens to receive the first portion of light transmitted through the beam splitter. The image sensor CMOS is located on the second image plane of the imaging lens to receive the second portion of light reflected by the beam splitter. At least a portion of the fiber end faces in the array fiber have a deflection angle relative to the normal of the first image plane. This deflection angle is a angular deflection with the principal ray of the light received at the corresponding fiber position as the target reference. Preferably, if the array fiber has a central fiber, the central fiber has no angular deflection, while the other fibers have angular deflection, and the normal of the fiber end face coincides with the principal ray of the light received at the corresponding fiber position, thereby maximizing the fiber-to-fiber efficiency.

[0035] In another embodiment, such as Figure 5 As shown, the beam splitter is a beam splitter, and the imaging component is an imaging lens. The array fiber is located on the first image plane of the imaging lens and is used to receive the first portion of light reflected by the beam splitter. The image sensor CMOS is located on the second image plane of the imaging lens and is used to receive the second portion of light transmitted through the beam splitter. In this case, the angular deflection method of the array fiber is the same as in the previous embodiment, and will not be described again here.

[0036] In another embodiment, the imaging assembly includes the imaging lens and a relay lens group. The relay lens group is located between the beam splitter and the array fiber, and is used to receive the first portion of light and transmit it to the array fiber. That is, a relay lens group can be added at the front end of the array fiber to receive light transmitted or reflected by the beam splitter and transmit the light to the array fiber, thereby improving the light collection efficiency of the fiber.

[0037] In another embodiment, the array of optical fibers is arranged in a two-dimensional and symmetrical distribution to simultaneously acquire spectral information from multiple different specific locations on the object under test. It should be noted that the number and position of the optical fibers in the array can be set as needed. Preferably, the array of optical fibers is arranged in a two-dimensional and symmetrical distribution, thus ensuring uniform fiber distribution and facilitating accurate subsequent color correction.

[0038] In another embodiment, the object to be tested is uniformly and virtually divided into multiple measurement regions, and each fiber in the array is located at a position corresponding to the center point of the multiple measurement regions, for acquiring spectral information at the center position of each measurement region. Figure 6As shown, the display screen under test is divided into four virtual regions, with the center points of each region being P1, P2, P3, and P4, and the center point of the entire display screen being P5. The array also has five optical fibers, used to acquire the light information of P1, P2, P3, P4, and P5, thereby obtaining the spectral information of the corresponding locations. Finally, this spectral information is used to correct the color information of the entire display screen.

[0039] The foregoing description is merely an exemplary embodiment of this disclosure and should not be construed as limiting the scope of this disclosure. Any equivalent changes and modifications made in accordance with the teachings of this disclosure shall still fall within the scope of this disclosure. Those skilled in the art will readily conceive of embodiments of this disclosure upon considering the specification and practicing the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not described herein. The specification and embodiments are to be considered exemplary only, and the scope and spirit of this disclosure are defined by the claims.

[0040] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0041] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lens fiber optic array coupling system, characterized in that, The system includes: An imaging component, comprising an imaging lens for acquiring incident light from the object under test and guiding it to an array of optical fibers; An array of optical fibers, wherein the end face of the array of optical fibers is located on the first image plane of the imaging component, and the normal of at least a portion of the end face of the optical fibers in the array of optical fibers has a deflection angle relative to the normal of the first image plane, wherein the deflection angle is an angle deflection with the principal ray of the light received at the corresponding optical fiber position as the target reference. An imaging spectrometer is used to receive light information transmitted by the array of optical fibers.

2. The lens fiber array coupling system as described in claim 1, characterized in that, The imaging assembly also includes a relay lens group located between the imaging lens and the array fiber, which is used to change the incident light rays passing through the imaging lens and guide them to the array fiber.

3. The lens fiber array coupling system as described in claim 1, characterized in that, At least a portion of the fiber end faces in the array fiber have a deflection angle relative to the normal of the first image plane, specifically: The array fiber has a central fiber, and the normal of the end face of the central fiber coincides with the normal of the first image plane. Except for the central optical fiber, the other optical fibers have a deflection angle such that the normal of the end face of the optical fiber coincides with the principal ray of the light received at the corresponding optical fiber position.

4. The lens fiber array coupling system as described in claim 1, characterized in that, At least a portion of the fiber end faces in the array fiber have a deflection angle relative to the normal of the first image plane, specifically: The array of optical fibers does not have a central fiber; all fibers have a deflection angle such that the normal to the end face of the fiber coincides with the principal ray of the light received at the corresponding fiber position.

5. The lens fiber array coupling system as described in claim 1, characterized in that: It also includes an optical fiber fixing component, which has multiple angled holes through which the array of optical fibers are mounted.

6. The lens fiber array coupling system as described in claim 1, characterized in that: The imaging component is an imaging lens, the first image plane is the image plane of the imaging lens, and the at least part of the optical fiber includes optical fiber N. i The optical fiber N i The deflection angle satisfies θ i =arctan(h i / f), where h i For fiber N i The corresponding image height is f, where f is the lens focal length.

7. A colorimetric measurement system, said colorimetric measurement system comprising the lens fiber array coupling system as described in any one of claims 1-6, characterized in that, The colorimetric measurement system also includes: a beam splitter, an array of optical fibers, and an image sensor; The beam splitter is located between the imaging lens and the array fiber, and is used to partially reflect and partially transmit the incident light, so that the incident light is split into a first part of light and a second part of light. The arrayed optical fiber, with its end face located on the first image plane of the imaging component, is used to receive a portion of the first portion of light and transmit it to the imaging spectrometer. The imaging spectrometer is used to obtain the first color information of the object under test based on the received light information; The image sensor is used to receive the second portion of light and acquire the second color information of the object under test.

8. The colorimetric measurement system as described in claim 7, characterized in that: The array of optical fibers is arranged in two dimensions and symmetrically distributed, and is used to simultaneously acquire spectral information from multiple different specific locations on the object under test.

9. The colorimetric measurement system as described in claim 7, characterized in that: The object to be tested is uniformly and virtually divided into multiple measurement regions. Each fiber in the array is located at a position corresponding to the center point of the multiple measurement regions, which is used to obtain the spectral information of the center position of each measurement region.

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