Automatic optical angle measuring system

Abstract

The present application relates to an automatic optical angle measurement system, which comprises a first position moving platform, a polarization state generator, a polarization state analyzer, a light detector and a measurement host. A light source projects a light spot of a light beam through the polarization state generator, a measured optical component and the polarization state analyzer to a light receiving surface of the light detector. The measurement host and the light detector determine the position of the light spot on the light receiving surface. When the light spot is not at the center of the light receiving surface, the measurement host controls the position moving platform to move the light source until the light spot is at the center of the light receiving surface. When the light spot is at the center of the light receiving surface, the light detector detects the light intensity of the light spot and transmits the light intensity to the measurement host to measure the angle of the measured optical component on the optical axis. The system can also use a cross mask to determine whether the light spot is at the center of the light receiving surface.

Description

TECHNICAL FIELD

[0001] The present application relates to a measurement system, in particular to an automatic optical angle measurement system. BACKGROUND

[0002] Virtual reality (VR) products are optical components of irregular curved surface structure, mainly composed of a reflective polarizer (RP) and a quarter wave plate (QWP) as a phase delay component. The sample after bonding is measured by a polarimeter to measure the angle between the optical axes of the quarter wave plate and the reflective polarizer. When the measured value is subtracted from the theoretical value (45°), a difference value is formed, which is the included angle (AA). The closer the difference value is to 0, the more accurate the optical axis alignment of the quarter wave plate and the reflective polarizer.

[0003] Because the sample to be measured is an irregular curved surface structure, if the incident light beam is not accurately adjusted and collimated to the center of the optical axis of the measured object, the incident light beam angle will be offset, causing the electric field (Ex, Ey) and phase difference (δ) of the polarized light in the X and Y directions to change, resulting in inaccurate measurement data. Therefore, the repeatability of the measurement data is poor, and the stability is not good. The prior art mainly adjusts the laser light incident position manually, and judges whether the laser source is collimated to the center position of the measured sample and the detector by the naked eye to obtain the measurement value. Table 1 is the actual measurement stability test data sample of the prior art. The deviation of the measurement value reaches 0.15-0.23 degrees, but the specification requires that it be within 0.1 degree. Because there is a large error in the manual and naked-eye judgment of the light spot position information, the repeatability of the measurement is poor, which affects the judgment of the optical axis alignment accuracy of the bonded film of the virtual reality product.

[0004] Table 1

[0005]

[0006] SUMMARY

[0007] Therefore, based on the above problems, the present application provides an automatic optical angle measurement system to solve the problems of the prior art.

[0008] The present application provides an automatic optical angle measurement system which reduces the time of adjusting the optical path, increases the measurement speed, and improves the stability and accuracy of the measurement value.

[0009] In an embodiment of the present application, an automatic optical angle measurement system is used to measure an angle between two adjacent optical components of a measured optical component. The automatic optical angle measurement system includes a first position moving platform, a polarization state generator, a polarization state analyzer, a light detector, a capturing lens, a mechanical arm and a measurement host. The first position moving platform is used to movably carry a light source. A light receiving surface of the light detector is provided with a cross-shaped mask, and a cross-shaped intersection of the cross-shaped mask is located at a center point of the light receiving surface. An image capturing surface of the capturing lens faces the cross-shaped mask, and a position of the mechanical arm corresponds to a position of the cross-shaped mask. The measurement host is electrically connected to the first position moving platform, the light detector, the capturing lens and the mechanical arm. The light source, the polarization state generator, the measured optical component, the polarization state analyzer and the light detector are sequentially arranged along an optical axis. The light source is used to generate a light beam, and the light beam passes through the polarization state generator, the measured optical component and the polarization state analyzer to the cross-shaped mask. The measurement host is used to determine a position of a light spot of the light beam on the cross-shaped mask by using the capturing lens. When the light spot does not fall on the cross-shaped intersection, the measurement host controls the first position moving platform to move the position of the light source until the light spot falls on the cross-shaped intersection. When the light spot falls on the cross-shaped intersection, the measurement host controls the mechanical arm to remove the cross-shaped mask from the light detector, and the light detector detects an intensity of the light spot and transmits the intensity to the measurement host to measure the angle.

[0010] In an embodiment of the present application, an automatic optical angle measurement system is used to measure an angle between two adjacent optical components of a measured optical component. The automatic optical angle measurement system includes a first position moving platform, a polarization state generator, a polarization state analyzer, a light detector and a measurement host. The first position moving platform is used to movably carry a light source, and the measurement host is electrically connected to the first position moving platform and the light detector. The light source, the polarization state generator, the measured optical component, the polarization state analyzer and the light detector are sequentially arranged along an optical axis. The light source is used to generate a light beam, and a light spot of the light beam passes through the polarization state generator, the measured optical component and the polarization state analyzer to a light receiving surface of the light detector. The light detector is used to detect an intensity of the light on the light receiving surface, and the measurement host is used to determine a position of the light spot on the light receiving surface according to the intensity. When the light spot does not fall on a center point of the light receiving surface, the measurement host controls the first position moving platform to move the position of the light source until the light spot falls on the center point. When the light spot falls on the center point, the measurement host measures the angle according to the intensity of the light spot.

[0011] In an embodiment of the present application, the polarization state generator includes a linear polarizer and a phase retarder, and the linear polarizer and the phase retarder are sequentially arranged along the optical axis, and the light beam sequentially passes through the linear polarizer and the phase retarder.

[0012] In an embodiment of the present application, the polarization state analyzer comprises a phase retarder and a linear polarizer, the phase retarder and the linear polarizer are sequentially arranged along an optical axis, and the light beam sequentially passes through the phase retarder and the linear polarizer.

[0013] In an embodiment of the present application, the phase retarder is a quarter wave plate.

[0014] In an embodiment of the present application, the cross mask is a target paper.

[0015] In an embodiment of the present application, the light detector is a charge coupled device (CCD).

[0016] In an embodiment of the present application, the light source is a laser light source.

[0017] In an embodiment of the present application, the optical assembly comprises a reflective polarizer and a phase retarder.

[0018] In an embodiment of the present application, the automatic optical angle measurement system further comprises a second position moving platform, the second position moving platform is electrically connected to the measurement host, and the second position moving platform is used to movably carry the optical assembly to be measured.

[0019] Based on the above, the automatic optical angle measurement system uses the cross mask to determine whether the light spot is located at the center point of the light receiving surface of the light detector by means of position alignment or light intensity detection. When it is determined that the light spot is located at the center point of the light receiving surface of the light detector, the light intensity of the light spot is transmitted to the measurement host to measure the angle, so as to reduce the time for adjusting the light path, increase the measurement speed, and improve the stability and accuracy of the measurement value.

[0020] In order to further understand and recognize the structural features and effects achieved by the present application, the preferred embodiment diagrams are described below in combination with detailed descriptions. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a schematic diagram of an automatic optical angle measurement system according to a first embodiment of the present application.

[0022] Figure 2 FIG. 4 is a schematic diagram of a light receiving surface of a light detector, a cross mask, and a light spot according to an embodiment of the present application.

[0023] Figure 3 FIG. 5 is a flowchart of an operation process of an automatic optical angle measurement system according to the first embodiment of the present application.

[0024] Figure 4 FIG. 6 is a schematic diagram of an automatic optical angle measurement system according to a second embodiment of the present application.

[0025] Figure 5A schematic diagram of a light receiving surface of a light detector of an embodiment of the present application and a light spot.

[0026] Figure 6 An operation flowchart of an automatic optical angle measurement system of a second embodiment of the present application.

[0027] Figure 7 A curve diagram of a test number and an angle degree of an embodiment of the present application.

[0028] Symbol explanation:

[0029] 1. An automatic optical angle measurement system

[0030] 10. A first position moving platform

[0031] 11. A polarization state generator

[0032] 110. A linear polarizer

[0033] 111. A phase retarder

[0034] 12. A polarization state analyzer

[0035] 120. A phase retarder

[0036] 121. A linear polarizer

[0037] 13. A light detector

[0038] 14. A pick-up lens

[0039] 15. A robot arm

[0040] 16. A measurement host computer

[0041] 17. A light source

[0042] 170. A light beam

[0043] 171. A light spot

[0044] 18. A cross mask

[0045] 19. A second position moving platform

[0046] 190. A through hole

[0047] 2. An optical component to be measured

[0048] 20. A phase retarder

[0049] 21. A reflective polarizer

[0050] S10, S12, S14, S16, S18, S20, S22, S24, S26, S28, a step DETAILED DESCRIPTION

[0051] Embodiments of the present application will be described further herein below with reference to the accompanying drawings. Whenever possible, like components will be referred to with like reference numerals. In the drawings and in the description below, like or similar components are referred to using the same or similar reference numerals. In the drawings, the shape and thickness of components can be exaggerated for the sake of clarity and convenience. It is understood that components not specifically shown or described in the drawings or the specification can take forms well known to those of ordinary skill in the art. Those of ordinary skill in the art can make various changes and modifications without departing from the scope of the present application.

[0052] When an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0053] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular component, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" are not necessarily referring to the same embodiment. Furthermore, the described components, structures, or characteristics can be combined in a suitable manner in one or more embodiments.

[0054] The disclosure is described with particularity and with reference to the following examples, which illustrate embodiments of the disclosure and are not intended to limit the scope of the disclosure. Various other embodiments, as well as various combinations of features that are not specifically enumerated, are within the scope of the disclosure. It is, therefore, not intended that the disclosure be limited to the particular embodiments described. In general, statement as to the scope of the application are meant to be illustrative and not restrictive and are not intended to exclude other embodiments or applications of the subject disclosure. Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the subject disclosure. Various substitutions and modifications can be made to the embodiments disclosed without departing from the scope of the subject disclosure. The disclosure is not limited by the specific examples described herein. The disclosure covers all alternatives falling within the scope of the claims.

[0055] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Pronouns in the masculine form include the feminine and neuter forms as well, and vice versa, and the singular form includes the plural form, unless the context clearly dictates otherwise. The terms "comprising," "including," "containing," "having," and the like are to be construed to be open-ended, that is, to mean including, but not limited to. Furthermore, any embodiments or claims that incorporate portions of this disclosure by reference are not intended to be limited to the specific embodiments or claims contained therein.

[0056] Unless specifically stated otherwise, some of the conditions or words e.g., "can," "could," "might," or "may," for example, are used throughout the disclosure in an attempt to reflect that implementations of the disclosure have yet to be decided, but that the features, components, or steps can be needed. In other embodiments, these features, components, or steps can not be needed.

[0057] The present application relates to an automatic optical angle measurement system. The system uses a cross mask to determine whether a light spot is at the center of a light receiving surface of a light detector. When the light spot is at the center of the light receiving surface, the light intensity of the light spot is transmitted to a measurement host to measure the angle, thereby reducing the time for adjusting the light path, increasing the measurement speed, and improving the stability and accuracy of the measurement value.

[0058] Figure 1 FIG. 1 is a schematic diagram of an automatic optical angle measurement system according to a first embodiment of the present application. Figure 2 FIG. 2 is a schematic diagram of a light receiving surface of a light detector, a cross mask, and a light spot according to an embodiment of the present application. Figure 1 Figure 2 The first embodiment of an automatic optical angle measurement system 1 of the present application is described below. The automatic optical angle measurement system 1 is used to measure the angle between two adjacent optical components of a measured optical assembly 2 on an optical axis. For example, the optical components can include a phase delay plate 20 and a reflective polarizer 21. The automatic optical angle measurement system 1 includes a first position moving platform 10, a polarization state generator 11, a polarization state analyzer 12, a light detector 13, a capturing lens 14, a mechanical arm 15, a measurement host 16, a light source 17, and a cross mask 18. In the first embodiment, the cross mask 18, the light detector 13, and the light source 17 can be exemplified by a target paper, a charge-coupled device (CCD), and a laser light source, respectively, but the present application is not limited thereto. The first position moving platform 10 can movably carry the light source 17. The cross mask 18 is disposed on a light receiving surface of the light detector 13, and the intersection of the cross shape of the cross mask 18 is at the center of the light receiving surface. The capturing lens 14 has an imaging surface facing the cross mask 18, and the mechanical arm 15 is positioned corresponding to the position of the cross mask 18. The measurement host 16 is electrically connected to the first position moving platform 10, the light detector 13, the capturing lens 14, and the mechanical arm 15. The electrical connection includes wired electrical connection or wireless electrical connection. The light source 17, the polarization state generator 11, the measured optical assembly 2, the polarization state analyzer 12, and the light detector 13 are sequentially arranged along an optical axis. The first position moving platform 10 can move the light source 17 in the y direction, and the mechanical arm 15 can move in the x direction and the y direction.

[0059] Figure 3 FIG. 3 is a flowchart of the operation of the automatic optical angle measurement system according to the first embodiment of the present application. Figure 1 Figure 2 Figure 3 ​​​First, as shown in step S10, the light source 17 generates a light beam 170, and the light beam 170 is transmitted through the polarization state generator 11, the optical assembly 2 under test, the polarization state analyzer 12, and is incident on the cross mask 18. Next, as shown in step S12, the measurement host 16 determines the position of a light spot 171 of the light beam 170 on the cross mask 18 by using the pick-up lens 14. Then, as shown in step S14, the measurement host 16 determines whether the light spot 171 falls on the intersection of the cross mask 18. When the measurement host 16 determines that the light spot 171 does not fall on the intersection of the cross mask 18, as shown in step S16, the measurement host 16 controls the first position moving platform 10 to move the position of the light source 17 until the light spot 171 falls on the intersection of the cross mask 18. When the measurement host 16 determines that the light spot 171 falls on the intersection of the cross mask 18, as shown in step S18, the measurement host 16 controls the mechanical arm 15 to remove the cross mask 18 from the light detector 13, and the light detector 13 detects the light intensity of the light spot 171 and transmits the same to the measurement host 16. The measurement host 16 measures the included angle between two adjacent optical assemblies of the optical assembly 2 under test on the optical axis, so as to reduce the time for adjusting the optical path, increase the measurement speed, and improve the stability and accuracy of the measurement value. Specifically, the measurement host 16 converts the light intensity into the Mueller matrix to be measured by using the Fourier analysis method, and obtains the included angle between two adjacent optical assemblies of the optical assembly 2 under test on the optical axis by using the calculation method of the Mueller matrix. If substantially the same result can be obtained, these steps do not necessarily have to be performed in the order shown in Figure 3 In some embodiments of the present application, the polarization state generator 11 can include a linear polarizer 110 and a phase retarder 111, wherein the phase retarder 111 can be, but is not limited to, a quarter-wave plate. The linear polarizer 110 and the phase retarder 111 are sequentially arranged along the optical axis, and the light beam 170 sequentially penetrates the linear polarizer 110 and the phase retarder 111. The polarization state analyzer 12 can include a phase retarder 120 and a linear polarizer 121, wherein the phase retarder 120 can be, but is not limited to, a quarter-wave plate. The phase retarder 120 and the linear polarizer 121 are sequentially arranged along the optical axis, and the light beam 170 sequentially penetrates the phase retarder 120 and the linear polarizer 121.

[0060] In some embodiments of the present application, the automatic optical angle measurement system 1 can further comprise a second position moving platform 19 electrically connected to the measurement host 16. The second position moving platform 19 is used to movably carry the optical component 2 to be measured. The second position moving platform 19 can move an object carried thereby in the x direction or the y direction, which object is exemplified by the optical component 2 to be measured. The second position moving platform 19 has a through hole 190 therethrough for the light beam 170 to pass through. In step S14, if it is judged that the light spot 171 does not fall on the intersection of the cross-shaped mask 18, then in step S16, the measurement host 16 simultaneously controls the second position moving platform 19 to move the optical component 2 to be measured so that the light beam 170 is collimated to pass through the optical axis center of the optical component 2 to be measured.

[0061] Figure 4 A schematic diagram of an automatic optical angle measurement system according to a second embodiment of the present application, Figure 5 A schematic diagram of a light receiving surface of a light detector and a light spot according to an embodiment of the present application. Please refer to Figure 4 And Figure 5 The second embodiment of the automatic optical angle measurement system 1 of the present application will be described below. The second embodiment differs from the first embodiment in that the second embodiment lacks the pickup lens, the mechanical arm and the cross-shaped mask. The positions and connection relationships of the other components have been described in the first embodiment and will not be described again here.

[0062] Figure 6 A flowchart of the operation of the automatic optical angle measurement system according to the second embodiment of the present application. Please refer to Figure 4 , Figure 5 And Figure 6first, as shown in step S20, the light source 17 generates a light beam 170, and a light spot 171 of the light beam 170 is transmitted through the polarization state generator 11, the optical assembly 2 under test, the polarization state analyzer 12, and the light-receiving surface of the light detector 13. Next, because the light detector 13 has a function of detecting the distribution of light intensity, i.e., the light detector 13 is preset with coordinates corresponding to each point of the light-receiving surface, and can transmit the coordinates and the corresponding light intensity to the measurement host 16, as shown in step S22, the light detector 13 measures the light intensity on the light-receiving surface of the light detector 13, and the measurement host 16 determines the position of the light spot 171 on the light-receiving surface according to the light intensity. Then, as shown in step S24, the measurement host 16 determines whether the light spot 171 falls on the center point of the light-receiving surface. When the measurement host 16 determines that the light spot 171 does not fall on the center point of the light-receiving surface, as shown in step S26, the measurement host 16 controls the first position moving platform 10 to move the position of the light source 17 until the light spot 171 falls on the center point of the light-receiving surface. When the measurement host 16 determines that the light spot 171 falls on the center point of the light-receiving surface, as shown in step S28, the measurement host 16 measures the included angle of the adjacent two optical assemblies of the optical assembly 2 under test on the optical axis according to the light intensity of the light spot 171, so as to reduce the time for adjusting the optical path, increase the measurement speed, and improve the stability and accuracy of the measurement value. Specifically, the measurement host 16 converts the light intensity into the Mueller matrix to be tested by the Fourier analysis method, and obtains the included angle of the adjacent two optical assemblies of the optical assembly 2 under test on the optical axis by the calculation method of the Mueller matrix. If substantially the same result can be obtained, these steps do not necessarily have to be performed in the order shown in Figure 6 The polarization state generator 11 can include a linear polarizer 110 and a phase retarder 111, wherein the phase retarder 111 can be, but is not limited to, a quarter-wave plate. The linear polarizer 110 and the phase retarder 111 are sequentially arranged along the optical axis, and the light beam 170 sequentially penetrates the linear polarizer 110 and the phase retarder 111. The polarization state analyzer 12 can include a phase retarder 120 and a linear polarizer 121, wherein the phase retarder 120 can be, but is not limited to, a quarter-wave plate. The phase retarder 120 and the linear polarizer 121 are sequentially arranged along the optical axis, and the light beam 170 sequentially penetrates the phase retarder 120 and the linear polarizer 121.

[0063] Likewise, in some embodiments of the present application, the automatic optical angle measurement system 1 further comprises a second position moving platform 19, which is electrically connected to the measurement host 16. The second position moving platform 19 is used to movably carry the optical component 2 to be measured. The second position moving platform 19 can move the optical component 2 to be measured in the x direction or the y direction. The second position moving platform 19 has a through hole 190 through itself, so that the light beam 170 can pass through. In step S24, if it is determined that the light spot 171 does not fall on the center point of the light receiving surface, then in step S26, the measurement host 16 simultaneously controls the second position moving platform 19 to move the optical component 2 to be measured, so that the light beam 170 is collimated through the optical axis center of the optical component 2 to be measured.

[0064] FIG. 7 is a curve diagram of the number of tests and the number of degrees of the angle according to an embodiment of the present application. FIG. 7 corresponds to Table 2, which is a sample of the actual measurement stability test data of the automatic optical angle measurement system according to the present application. The circle, diamond, and square represent the numbers #1, #2, and #3 of the samples to be measured, respectively. The deviation of the measurement value is 0.03-0.07 degrees, which is within the specification requirement of 0.1 degrees. Therefore, the measurement stability and accuracy can be improved.

[0065] Table 2

[0066]

[0067] According to the above-mentioned embodiments, the automatic optical angle measurement system reduces the time for adjusting the optical path, increases the measurement speed, and improves the stability and accuracy of the measurement value.

[0068] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of the present application. Any equivalent changes and modifications made according to the shape, structure, features, and spirit of the present application described in the claims are included in the scope of the present application.

Claims

1. An automatic optical angle measurement system, characterized in that, include: The first position mobile platform is used to move and support the light source; Polarization state generator, polarization state analyzer, and photodetector; The measurement host is electrically connected to the first position moving platform and the photodetector; A capturing lens, wherein the image-capturing surface of the capturing lens faces a cross-shaped shield disposed on the light-receiving surface of the photodetector, and the intersection of the cross shape of the cross-shaped shield is located at the center point of the light-receiving surface; as well as A robotic arm, the position of which corresponds to the position of the cross shield, and the measuring host electrically connected to the capturing lens and the robotic arm; The light source, the polarization state generator, the optical component under test, the polarization state analyzer, and the photodetector are all arranged sequentially along an optical axis.

2. The automatic optical angle measurement system according to claim 1, characterized in that, The polarization state generator includes a linear polarizer and a phase retarder, which are arranged sequentially along the optical axis.

3. The automatic optical angle measurement system according to claim 2, characterized in that, The phase delay plate is a quarter-wave plate.

4. The automatic optical angle measurement system according to claim 1, characterized in that, The polarization state analyzer includes a phase retarder and a linear polarizer, which are arranged sequentially along the optical axis.

5. The automatic optical angle measurement system according to claim 4, characterized in that, The phase delay plate is a quarter-wave plate.

6. The automatic optical angle measurement system according to claim 1, characterized in that, The photodetector is a charge-coupled device.

7. The automatic optical angle measurement system according to claim 1, characterized in that, The light source is a laser light source.

8. The automatic optical angle measurement system according to claim 1, characterized in that, The cross-shaped shield is a target paper.

9. The automatic optical angle measurement system according to claim 1, characterized in that, The automatic optical angle measurement system further includes a second position moving platform, which is electrically connected to the measurement host and is used to movably carry the optical component to be measured.

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