A rainbow pattern detection device

Abstract

The utility model relates to a kind of rainbow pattern detection devices, comprising: base, the base has a rotation axis line;Annular track, the annular track is rotatably arranged on the base around the rotation axis line, the rotation axis line extends along the radial direction of the annular track and passes through the center of the annular track;Illumination unit, the illumination unit is movably arranged on the annular track;Detection unit, the detection unit is used to photograph the optical waveguide located at the center of the annular track.

Description

Technical Field

[0001] This utility model relates to the field of optical detection, and in particular to a rainbow pattern detection device. Background Technology

[0002] The mainstream display optical solutions for AR glasses are waveguides and BirdBath (BB for short). Among them, waveguides are considered the ultimate optical display solution for future AR glasses due to their thin and light shape, large eye box, and high transmittance.

[0003] However, optical waveguides also have some display defects, such as the rainbow effect unique to diffractive waveguides. Specifically, when external light passes through the waveguide sheet, it undergoes multiple diffractions and interferences. Light of different wavelengths disperses due to phase differences, and from the human eye's perspective, the rainbow effect appears as rainbow-like spots on the waveguide sheet. This rainbow effect can affect the viewer's perception of the image, reducing the wearing experience of AR glasses. Therefore, detecting the rainbow effect is a crucial step in comprehensively evaluating the display effect of optical waveguides.

[0004] In the process of detecting rainbow patterns, it is necessary to control the rotation of the light source in the longitude and latitude directions of the optical waveguide to capture images of the optical waveguide under different test conditions. However, in existing rainbow pattern detection devices, the rotation of the light source in the longitude and latitude directions is often accompanied by changes in the distance between the light source and the optical waveguide. This increases the difficulty of data analysis of the optical waveguide images and reduces the detection accuracy of rainbow patterns. Utility Model Content

[0005] Therefore, it is necessary to provide a rainbow pattern detection device to address the problem of poor rainbow pattern detection performance.

[0006] A rainbow pattern detection device, comprising:

[0007] The base has a pivot axis;

[0008] A circular track is rotatably mounted on the base about the axis of rotation, the axis of rotation extends radially along the circular track and passes through the center of the circular track, and the central angle of the circular track is greater than 180°.

[0009] A lighting unit, which is movably mounted on the circular track;

[0010] A detection unit is used to capture images of the optical waveguide located at the center of the annular track.

[0011] Based on this invention, after the optical waveguide is placed at the center of the circular track, the lighting unit can rotate in the latitudinal direction of the optical waveguide by moving on the circular track; simultaneously, the circular track can rotate in the longitudinal direction of the optical waveguide by rotating around its axis. This effectively avoids mutual interference between the latitudinal and longitudinal rotations of the lighting unit, thereby achieving decoupled adjustment at any latitude and longitude.

[0012] Furthermore, since the axis of rotation extends radially along the circular track and passes through its center, and the optical waveguide is located at the center of the circular track, rotation of the illumination unit in both the latitude and longitude directions of the optical waveguide will not change the distance between the illumination unit and the optical waveguide. Accordingly, this invention's rainbow pattern detection device can photograph the optical waveguide under fixed illumination unit longitude or fixed illumination unit latitude conditions. This reduces the number of variables and the difficulty of data analysis during the analysis of the optical waveguide photographs, ultimately improving the accuracy of rainbow pattern analysis.

[0013] Furthermore, since the central angle of the circular track is greater than 180°, the illumination unit can reach the front side of the optical waveguide (the side of the optical waveguide away from the detection unit) to illuminate the optical waveguide, or it can reach the rear side of the optical waveguide (the side of the optical waveguide closer to the detection unit) to illuminate the optical waveguide, thus meeting the needs of different detection scenarios.

[0014] In some embodiments, the entrance pupil position of the detection unit coincides with the eye point position of the optical waveguide.

[0015] In some embodiments, the lighting unit includes a telescopic assembly and a light source disposed at the output end of the telescopic assembly, the telescopic assembly being used to drive the light source to move radially along the annular track.

[0016] The telescopic component can adjust the distance between the light source and the waveguide under test according to actual needs to ensure the illumination effect. For example, it can improve the test errors or effects caused by excessive illumination distance leading to an increased beam angle of the light source and poor consistency of the light color space distribution.

[0017] In some embodiments, the lighting unit further includes an angle adjustment component disposed between the light source and the output end of the telescopic component, the angle adjustment component being used to drive the light source to perform pitch rotation and / or yaw rotation.

[0018] In this invention, the angle adjustment component can be used to flexibly adjust the incident angle and incident position of the light source on the optical waveguide.

[0019] In some embodiments, the light source is a brightness and / or color temperature adjustable light source.

[0020] In some embodiments, the rainbow pattern detection device further includes a support platform on which the detection unit is placed.

[0021] In some embodiments, the support platform is used to support the optical waveguide so that the optical waveguide is located at the center of the annular track.

[0022] In some embodiments, a first six-axis adjustment assembly is provided on the support platform, which is used to adjust the position of the optical waveguide to the center of the annular track.

[0023] In some embodiments, a second six-axis adjustment assembly is provided on the support platform, and the detection unit is placed on the second six-axis adjustment assembly. The second six-axis adjustment assembly is used to adjust the entrance pupil position of the detection unit to coincide with the eye point position of the optical waveguide.

[0024] In some embodiments, the annular track is provided with a clearance gap, and the detection unit and the support platform are located at the clearance gap, so that the annular track is spaced apart from the detection unit and the support platform. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the main structure of the rainbow pattern detection device.

[0026] Figure 2 This is a top view of the rainbow pattern detection device.

[0027] Figure label:

[0028] 1. Base; 11. First motor; 12. First drive shaft; 2. Circular track; 21. Clearance notch; 3. Lighting unit; 31. Telescopic assembly; 32. Light source; 33. Angle adjustment assembly; 4. Detection unit; 5. Support platform; 51. First six-axis adjustment assembly; 52. Second six-axis adjustment assembly; 100. Optical waveguide. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0035] Example:

[0036] like Figure 1 and Figure 2 As shown, this embodiment provides a rainbow pattern detection device, including a base 1, a ring track 2, an illumination unit 3, and a detection unit 4.

[0037] First, the optical waveguide 100 is located at the center of the annular track 2, and the illumination unit 3 is movably mounted on the annular track 2. This configuration means that the movement of the illumination unit 3 on the annular track 2 is equivalent to the rotation of the illumination unit 3 in the latitude direction of the optical waveguide 100. Second, the base 1 has a rotation axis extending radially along the annular track 2, and the annular track 2 is rotatably mounted on the base 1 around the rotation axis. This configuration allows the annular track 2 to drive the illumination unit 3 to rotate around the rotation axis, and the rotation of the illumination unit 3 around the rotation axis is equivalent to the rotation of the illumination unit 3 in the longitude direction of the optical waveguide 100. Furthermore, by setting the rotation axis to pass through the center of the annular track 2, the longitude and latitude adjustment processes of the illumination unit 3 are made independent, allowing for individual adjustment of either the longitude or latitude of the illumination unit 3. This also prevents changes in the distance between the illumination unit 3 and the optical waveguide 100 due to longitude and latitude adjustment movements.

[0038] As the longitude or latitude of the illumination unit 3 changes continuously, the detection unit 4 will continuously take pictures of the optical waveguide 100, and the detection unit 4 will also perform data analysis on the series of pictures taken to obtain the relevant information about the rainbow pattern.

[0039] In some embodiments, the longitude of the illumination unit 3 can be kept constant while the latitude of the illumination unit 3 changes continuously. In this case, in a series of photos taken by the detection unit 4, the relevant variable data, while including the latitude of the illumination unit 3, excludes the longitude of the illumination unit 3 and the distance between the illumination unit 3 and the optical waveguide 100. This reduces the difficulty of data analysis during the photo analysis process and ultimately improves the detection accuracy of the rainbow pattern.

[0040] In other embodiments, the latitude of the illumination unit 3 can be kept constant while the longitude of the illumination unit 3 changes continuously. In this case, in a series of photos taken by the detection unit 4, the relevant variable data, while including the longitude of the illumination unit 3, excludes the latitude of the illumination unit 3 and the distance between the illumination unit 3 and the optical waveguide 100. This reduces the difficulty of data analysis during the photo analysis process and ultimately improves the detection accuracy of the rainbow pattern.

[0041] In actual testing, with the optical waveguide 100 located at the center of the circular track 2, the entrance pupil position of the detection unit 4 is further controlled to coincide with the eye point position of the optical waveguide 100, and the optical axis of the detection unit 4 is ensured to be parallel to the optical axis of the optical waveguide 100 under test.

[0042] For example, in this embodiment, a first motor 11 is installed on the base 1. The motor shaft of the first motor 11 can be connected to a first transmission shaft 12 through a coupling. The axis of the first transmission shaft 12 coincides with the axis of rotation. The end of the first transmission shaft 12 is fixed to the edge of the annular track 2. Thus, the first motor 11 can control the annular track 2 and the lighting unit 3 to rotate around the axis of rotation through the first transmission shaft 12.

[0043] In this embodiment, the first drive shaft 12 is perpendicular to the horizontal plane, so that the annular track 2 can be supported on the base 1.

[0044] For example, in some embodiments, a second motor can be installed on the lighting unit 3, and a first transmission gear can be installed on the motor shaft of the second motor. The annular track 2 can specifically be a gear ring. The first transmission gear meshes with the annular track 2, and the annular track 2 also limits the second motor in its own radial direction. In this way, the second motor can control the lighting unit 3 to move on the annular track 2.

[0045] Preferably, in this embodiment, the lighting unit 3 includes a telescopic component 31 and a light source 32 disposed at the output end of the telescopic component 31. The lighting unit 3 can illuminate the optical waveguide 100 through the light source 32. The telescopic component 31 can specifically be a cylinder or a linear motor. The axis of the telescopic component 31 passes through the center of the annular track 2, so that the telescopic component 31 can drive the light source 32 to move radially along the annular track 2, thereby adjusting the distance between the light source 32 and the optical waveguide 100.

[0046] It is worth noting that during the process of adjusting the distance between the light source 32 and the optical waveguide 100 by the telescopic component 31, the longitude and latitude of the light source 32 did not change. In other words, the adjustment process of the distance between the light source 32 and the optical waveguide 100 is independent of the adjustment of the longitude and latitude of the light source 32.

[0047] Therefore, in some embodiments, the longitude and latitude of the light source 32 can be kept constant, while the telescopic component 31 controls the distance between the light source 32 and the optical waveguide 100 to change continuously. At this time, in a series of photos captured by the detection unit 4, the relevant variable data, including the distance between the light source 32 and the optical waveguide 100, excludes the longitude and latitude of the light source 32. This reduces the difficulty of data analysis during the photo analysis process and ultimately improves the detection accuracy of the rainbow pattern.

[0048] In a further preferred embodiment, the lighting unit 3 may further include an angle adjustment component 33. The angle adjustment component 33 is disposed between the light source 32 and the output end of the telescopic component 31. The telescopic component 31 drives the light source 32 to move radially along the annular track 2 through the angle adjustment component 33. Specifically, the angle adjustment component 33 may be a motor. The angle adjustment component 33 can control the light source 32 to perform pitch rotation and / or yaw rotation on the telescopic component 31, thereby changing the incident angle of the light source 32 on the optical waveguide 100.

[0049] The adjustment action of the angle adjustment component 33 on the light source 32 does not change the longitude, latitude, or distance between the light source 32 and the optical waveguide 100. Therefore, in some embodiments, the longitude, latitude, and distance between the light source 32 and the optical waveguide 100 can be kept constant, while the angle adjustment component 33 continuously changes the incident angle of the light source 32 on the optical waveguide 100. In this case, in a series of photos captured by the detection unit 4, the relevant variable data, including the incident angle of the light source 32 on the optical waveguide 100, excludes the longitude, latitude, and distance between the light source 32 and the optical waveguide 100. This reduces the difficulty of data analysis during the photo analysis process and ultimately improves the detection accuracy of the rainbow pattern.

[0050] In some embodiments, a guide rail may be further provided on the telescopic component 31, and the angle adjustment component 33 can obtain movement guidance through the guide rail.

[0051] In this embodiment, the light source 32 can be, for example, a point light source, whose color temperature and brightness are adjustable. The adjustment method can be manual switching or software control by a host computer.

[0052] The annular track 2 can be a complete circle or a part of a circle. Correspondingly, the central angle of the annular track 2 can be 360° or less. In this embodiment, the central angle of the annular track 2 is greater than 180°, for example, 240°. With this design, as the illumination unit 3 rotates along the latitudinal direction of the optical waveguide 100, it can illuminate both the front side (the side of the optical waveguide 100 away from the detection unit 4) and the rear side (the side of the optical waveguide 100 closer to the detection unit 4), thus meeting the needs of different detection scenarios.

[0053] The rainbow pattern detection device in this embodiment also includes a support platform 5, on which the optical waveguide 100 and the detection unit 4 are placed. The optical waveguide 100 can be positioned at least at the center of the annular track 2 via the support platform 5, thereby allowing the entrance pupil position of the detection unit 4 to coincide with the eye point position of the optical waveguide 100.

[0054] In this embodiment, the annular track 2 is provided with a clearance notch 21, meaning the central angle of the annular track 2 is less than 360°. The detection unit 4 and the support platform 5 are located at the clearance notch 21, allowing the annular track 2 to be spaced apart from the detection unit 4 and the support platform 5. During the rotation of the annular track 2 along the longitude direction of the optical waveguide 100, the detection unit 4 and the support platform 5 can avoid the annular track 2 through the clearance notch 21, thereby reducing the restriction on the rotation angle of the annular track 2 in the longitude direction.

[0055] More preferably, the support platform 5 is provided with a first six-axis adjustment assembly 51 and / or a second six-axis adjustment assembly 52. ​​The optical waveguide 100 is supported on the first six-axis adjustment assembly 51, and the detection unit 4 is placed on the second six-axis adjustment assembly 52. ​​With the optical waveguide 100 and detection unit 4 supported by the support platform 5, the position of the optical waveguide 100 can be further adjusted to the center of the annular track 2 using the first six-axis adjustment assembly 51, and the entrance pupil position of the detection unit 4 can be further adjusted to coincide with the eyepoint position of the optical waveguide 100 using the second six-axis adjustment assembly 52.

[0056] In this embodiment, the detection unit 4 includes a humanoid eyepiece, a camera, and a luminance and colorimetry measurement device (imaging luminance and colorimeter or spectrometer). The field of view of the detection unit 4 must be greater than the field of view of the optical waveguide 100. During testing, by adjusting the first six-axis adjustment component 51 and the second six-axis adjustment component 52, the entrance pupil position of the detection unit 4 can be better aligned with the exit pupil position of the optical waveguide 100.

[0057] 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.

[0058] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A rainbow pattern detection device, characterized in that, include: The base (1) has a pivot axis; A circular track (2) is rotatably mounted on the base (1) around the axis of rotation. The axis of rotation extends radially along the circular track (2) and passes through the center of the circular track (2). The central angle of the circular track (2) is greater than 180°. Lighting unit (3), which is movably mounted on the annular track (2); The detection unit (4) is used to capture images of the optical waveguide (100) located at the center of the circular track (2).

2. The rainbow pattern detection device according to claim 1, characterized in that, The entrance pupil position of the detection unit (4) coincides with the eye point position of the optical waveguide (100).

3. The rainbow pattern detection device according to claim 1, characterized in that, The lighting unit (3) includes a telescopic component (31) and a light source (32) disposed at the output end of the telescopic component (31). The telescopic component (31) is used to drive the light source (32) to move radially along the annular track (2).

4. The rainbow pattern detection device according to claim 3, characterized in that, The lighting unit (3) further includes an angle adjustment component (33), which is disposed between the light source (32) and the output end of the telescopic component (31). The angle adjustment component (33) is used to drive the light source (32) to perform pitch rotation and / or yaw rotation.

5. The rainbow pattern detection device according to claim 3, characterized in that, The light source (32) is a brightness and / or color temperature adjustable light source.

6. The rainbow pattern detection device according to claim 1, characterized in that, The rainbow pattern detection device also includes a support platform (5), and the detection unit (4) is placed on the support platform (5).

7. The rainbow pattern detection device according to claim 6, characterized in that, The support platform (5) is used to support the optical waveguide (100) so that the optical waveguide (100) is located at the center of the annular track (2).

8. The rainbow pattern detection device according to claim 7, characterized in that, The support platform (5) is provided with a first six-axis adjustment component (51), which is used to adjust the position of the optical waveguide (100) to the center of the annular track (2).

9. The rainbow pattern detection device according to claim 6, characterized in that, The support platform (5) is provided with a second six-axis adjustment component (52), and the detection unit (4) is placed on the second six-axis adjustment component (52). The second six-axis adjustment component (52) is used to adjust the entrance pupil position of the detection unit (4) to coincide with the eye point position of the optical waveguide (100).

10. The rainbow pattern detection device according to claim 6, characterized in that, The circular track (2) is provided with a clearance gap (21), and the detection unit (4) and the support platform (5) are located at the clearance gap (21) so that the circular track (2) is spaced between the detection unit (4) and the support platform (5).

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