Lens focusing mechanism and panel detection device

Abstract

The utility model relates to a lens focusing mechanism and a panel detection device, the lens focusing mechanism comprises a fixed seat, a lens module and a transmission assembly, the lens module is telescopically arranged on the fixed seat; the transmission assembly comprises a first gear and a plurality of second gears, the plurality of second gears are simultaneously engaged with the same tooth groove of the first gear, the installation directions of two adjacent second gears are opposite, the first gear is fixed on the lens module, and in the rotation process of the first gear, the first gear can drive the lens module to stretch out and draw back relative to the fixed seat. According to the lens focusing mechanism provided by the invention, the meshing gap between the second gear and the first gear can be adjusted to be small, the rotation adjustment precision of the first gear is improved, the telescopic distance of the lens module is finely adjusted, and the imaging quality of the lens module for each point of the measured workpiece is further ensured.

Description

Technical Field

[0001] This application relates to the field of optical focusing technology, and in particular to a lens focusing mechanism and a panel detection device. Background Technology

[0002] With the rapid development of optical technology, the technology and product application scale of display devices have grown rapidly. Display technology has been continuously iterating and developing from LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode), Mini LED (Mini Light-Emitting Diode), and Micro LED (Micro Light-Emitting Diode Display), which has put forward higher requirements for the performance and defect testing of display panels.

[0003] Currently, in the process of testing the performance and defects of display panels, lens modules are generally used to obtain the brightness, color and other performance and surface defects of the display panel. However, when performing multi-point testing on the display panel, due to the deviation between the test stations and the fixed lens module, the image is prone to problems such as blurring and ghosting during the multi-point imaging process of the display panel, which seriously affects the reliability of the performance and defect testing of the display panel. Utility Model Content

[0004] Therefore, it is necessary to provide a lens focusing mechanism and a panel detection device to address the problems of blurry images and ghost images that easily occur when the lens module performs multi-point imaging on the display panel.

[0005] A lens focusing mechanism, the lens focusing mechanism comprising:

[0006] Fixed base;

[0007] A lens module, wherein the lens module is retractably mounted on the mounting base; and

[0008] The transmission assembly includes a first gear and a plurality of second gears, the plurality of second gears simultaneously meshing with the same tooth groove of the first gear, and the installation directions of two adjacent second gears being opposite. The first gear is fixed to the lens module, and during the rotation of the first gear, the first gear can drive the lens module to extend and retract relative to the mounting base.

[0009] In one embodiment, the transmission assembly further includes a drive element and a transmission shaft, the transmission shaft being drively connected to the output end of the drive element, and a plurality of second gears being sequentially and intermittently fitted onto the transmission shaft along the axial direction of the transmission shaft.

[0010] In one embodiment, one of two adjacent second gears is fitted onto the drive shaft in a clockwise direction, and the other of the two gears is fitted onto the drive shaft in a counterclockwise direction.

[0011] In one embodiment, there are two second gears, one of which is fixed to the other, and the other is fixed to the drive shaft.

[0012] In one embodiment, the lens focusing mechanism further includes a sensing module for acquiring the rotation angle of the first gear.

[0013] In one embodiment, the sensing module includes a sensor and a sensing plate. The sensor is disposed on the fixed base, and the sensing plate is disposed on the first gear. During the rotation of the first gear, the sensor can acquire the position information of the sensing plate.

[0014] In one embodiment, the lens module includes a lens barrel and a lens disposed within the lens barrel. The lens barrel is telescopically disposed on the fixed base. The first gear is sleeved on the outside of the lens barrel. The lens is used to acquire an image of the workpiece being measured.

[0015] In one embodiment, the mounting base includes a base body and a mounting bracket protruding from the base body, the lens barrel is screwed onto the mounting bracket, and is movable in the direction of extending out of or retracting from the mounting bracket.

[0016] A panel inspection device, the panel inspection device including a lens focusing mechanism as described in any of the above technical solutions.

[0017] In one embodiment, the panel inspection device further includes a defect detection module and a colorimetric detection module;

[0018] Both the defect detection module and the colorimetry detection module are mounted on the fixed base, and the defect detection module and the colorimetry detection module can receive the images acquired by the lens module.

[0019] The aforementioned lens focusing mechanism and panel inspection device, during the process of multi-point imaging of the workpiece under test by the lens module, can drive the lens module to extend and retract relative to the fixed seat through the rotation of the first gear, thereby adjusting the distance between the lens module and the workpiece under test and ensuring the imaging quality of each point of the workpiece under test by the lens module. In the lens focusing mechanism provided in this application, the installation directions of two adjacent second gears are opposite. When two adjacent second gears simultaneously mesh with the same tooth groove of the first gear, the two adjacent second gears can compensate for the gear backlash between themselves and the first gear, thereby adjusting the meshing gap between the second gear and the first gear to a smaller value, improving the rotation adjustment accuracy of the first gear, and thus finely adjusting the extension and retraction distance of the lens module, further ensuring the imaging quality of each point of the workpiece under test by the lens module. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the lens focusing mechanism provided in some embodiments.

[0021] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle.

[0022] Figure 3 for Figure 1 A magnified view of a portion of region B in the middle.

[0023] Figure 4 This is a schematic diagram of the panel detection device provided in some embodiments.

[0024] Figure label:

[0025] 100. Lens focusing mechanism;

[0026] 110. Mounting base; 111. Base body; 112. Mounting bracket; 120. Lens module; 121. Lens barrel; 122. Lens; 130. Transmission assembly; 131. First gear; 132. Second gear; 133. Drive element; 134. Drive shaft; 140. Sensing module; 141. Sensor; 142. Sensing plate;

[0027] 200. Panel testing device;

[0028] 210. Defect detection module; 220. Colorimetric detection module. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application 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 application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not 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 application.

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

[0032] In this application, unless otherwise expressly 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 expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via 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. Similarly, "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 if 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. If 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. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0035] The technical solutions provided by the embodiments of this application are described below with reference to the accompanying drawings.

[0036] See Figure 1 and Figure 2 As shown, this application provides a lens focusing mechanism 100, which includes a fixed base 110, a lens module 120 and a transmission assembly 130. The lens module 120 is telescopically mounted on the fixed base 110. The lens focusing mechanism 100 is used to adjust the focal position of the lens module 120 relative to the workpiece being measured, so as to ensure the imaging quality of each point of the workpiece being measured by the lens module 120.

[0037] The transmission assembly 130 includes a first gear 131 and a plurality of second gears 132. The plurality of second gears 132 simultaneously mesh with the same tooth groove of the first gear 131, and adjacent second gears 132 are installed in opposite directions. For example, if there are two second gears 132, one second gear 132 is installed clockwise and the other second gear 132 is installed counterclockwise; or if there are three second gears 132, the three second gears 132 are stacked sequentially along the tooth thickness direction, with the second gear 132 in the middle position installed clockwise and the second gears 132 on both sides installed counterclockwise, or the second gear 132 in the middle position installed counterclockwise and the second gears 132 on both sides installed clockwise. The first gear 131 is fixed to the lens module 120, and during the rotation of the first gear 131, the first gear 131 can drive the lens module 120 to extend and retract relative to the fixing base 110. Specifically, when the lens module 120 performs multi-point imaging on the workpiece under test, since there will be deviations at each test point, the rotation of the first gear 131 can drive the lens module 120 to extend and retract relative to the fixed base 110 to adjust the distance between the lens module 120 and the workpiece under test, thereby adjusting the focal position of the lens module 120 and ensuring the imaging quality of each point of the workpiece under test by the lens module 120.

[0038] Typically, if focusing of the lens module 120 is achieved by meshing a first gear 131 and a second gear 132, the large backlash between the first gear 131 and the second gear 132 will cause the first gear 131 to rotate excessively when the power source outputs power once. This results in an excessive single adjustment of the lens module 120, affecting the image quality of the lens module 120. In this application, the installation directions of two adjacent second gears 132 are opposite. During installation, one of the second gears 132 can adjust and correct the gear backlash between the other second gear 132 and the first gear 131. When two adjacent second gears 132 mesh with the same tooth groove of the first gear 131 at the same time, the two adjacent second gears 132 can compensate for the gear backlash between themselves and the first gear 131, so as to adjust the meshing gap between the second gear 132 and the first gear 131 to a smaller value, improve the rotation adjustment accuracy of the first gear 131, so as to make fine adjustments to the telescopic distance of the lens module 120, and further ensure the imaging quality of each point of the workpiece being measured by the lens module 120.

[0039] In one embodiment, see Figure 1 and Figure 2As shown, the transmission assembly 130 also includes a drive element 133 and a transmission shaft 134. The transmission shaft 134 is tractively connected to the output end of the drive element 133. A plurality of second gears 132 are sleeved on the transmission shaft 134 along the axial direction, and the plurality of second gears 132 are stacked along the tooth thickness direction to realize the installation of the plurality of second gears 132. The plurality of second gears 132 and the outer periphery of the transmission shaft 134 have gaps, so that the second gears 132 can be finely adjusted during the process of fixing the second gears 132 to the transmission shaft 134, thereby adjusting the backlash between the second gears 132 and the first gear 131. Thus, when the drive element 133 outputs power to the transmission shaft 134, the transmission shaft 134 rotates, causing multiple second gears 132 to rotate synchronously. The second gears 132 serve as the driving source to drive the first gear 131 to rotate, thereby causing the lens module 120 to extend and retract relative to the fixed base 110. This adjusts the distance between the lens module 120 and the workpiece being measured, ensuring the imaging quality of each point of the workpiece by the lens module 120. Furthermore, by placing multiple second gears 132 on the same side of the first gear 131, the second gears 132 drive the first gear 131 to rotate on one side, avoiding any jamming or other adverse phenomena that may occur when the second gears 132 drive the first gear 131 to rotate.

[0040] In this embodiment, the driving element 133 can be a drive motor, a drive cylinder, or other elements capable of outputting power. This application does not limit the specific type of the driving element 133.

[0041] Specifically, see Figure 1 and Figure 2 As shown, one of the two adjacent second gears 132 is mounted clockwise on the drive shaft 134, and the other second gear 132 is mounted counterclockwise on the drive shaft 134, so that the installation directions of the two adjacent second gears 132 are opposite. When the two adjacent second gears 132 mesh with the same tooth groove of the first gear 131 at the same time, the two adjacent second gears 132 can compensate for the gear backlash between them and the first gear 131, so as to adjust the meshing gap between the second gear 132 and the first gear 131 to a smaller value, improve the rotation adjustment accuracy of the first gear 131, so as to make fine adjustments to the telescopic distance of the lens module 120, and further ensure the imaging quality of each point of the workpiece being measured by the lens module 120.

[0042] In one embodiment, see Figures 1-3As shown, the lens focusing mechanism 100 also includes a sensing module 140, which is used to acquire the rotation angle of the first gear 131. Since the focusing range of the lens module 120 is related to the rotation angle of the first gear 131, by acquiring the rotation angle of the first gear 131 through the sensing module 140, the focusing range of the lens module 120 can be acquired in real time, so as to adjust the focal position of the lens module 120 to a preset position to capture the workpiece under test, ensuring the imaging quality of each point of the workpiece under test by the lens module 120.

[0043] Specifically, see Figures 1-3 As shown, the sensing module 140 includes a sensor 141 and a sensing plate 142. The sensor 141 is disposed on the fixed base 110, and the sensing plate 142 is disposed on the first gear 131. During the rotation of the first gear 131, the sensor 141 can acquire the position information of the sensing plate 142 to obtain the focusing amplitude of the lens module 120 in real time. For example, see [reference]. Figure 3 As shown, if the position where the first gear 131 drives the sensor 142 to move to the position directly below the sensor 141 is taken as the zero point position, the sensor 141 obtains the deviation information between the sensor 142 and the zero point position, so as to obtain the rotation angle of the first gear 131, and the focusing amplitude of the lens module 120 can be obtained in real time.

[0044] In this embodiment, sensor 141 can be a position sensor, proximity sensor, or other element capable of sensing position information. This application does not limit the specific element type of sensor 141.

[0045] In one embodiment, see Figure 1 and Figure 2 As shown, the lens module 120 includes a lens barrel 121 and a lens 122. The lens 122 is installed inside the lens barrel 121 by means of embedding or snap-fitting, and is used to acquire images of the workpiece under test. The lens barrel 121 is telescopically mounted on the fixed base 110. A first gear 131 is sleeved on the outside of the lens barrel 121. When the second gear 132 drives the first gear 131 to rotate, the first gear 131 drives the lens barrel 121 to extend and retract relative to the fixed base 110. The lens barrel 121 drives the lens 122 to move, thereby adjusting the distance between the lens 122 and the workpiece under test, and thus adjusting the focal position of the lens 122. During the imaging process of the lens 122 on the workpiece under test, the imaging quality of the lens 122 on the workpiece under test is ensured.

[0046] Specifically, see Figure 1 and Figure 2As shown, the mounting base 110 includes a base body 111 and a mounting bracket 112. The mounting bracket 112 protrudes from the base body 111, and the lens barrel 121 is screwed onto the mounting bracket 112. The lens barrel 121 can move in the direction of extending out of or retracting from the mounting bracket 112 to adjust the distance between the lens 122 and the workpiece being measured, thereby adjusting the focal position of the lens 122. During the imaging process of the lens 122 onto the workpiece being measured, the imaging quality of the lens 122 is ensured. Exemplarily, the mounting bracket 112 has a cylindrical structure, and an internal thread is provided inside the mounting bracket 112. An external thread is provided outside the lens barrel 121. Through the cooperation between the internal thread of the mounting bracket 112 and the external thread of the lens barrel 121, the lens barrel 121 is screwed onto the mounting bracket 112, so that the lens barrel 121 is telescopically set on the mounting bracket 112. By changing the amount of screwing of the lens barrel 121 on the mounting bracket 112, the distance between the lens 122 and the workpiece being measured can be adjusted.

[0047] Additionally, see Figure 1 , Figure 2 and Figure 4 As shown, this application also provides a panel inspection device 200, which includes a lens focusing mechanism 100 as described above. The panel inspection device 200 is used to perform imaging inspection on the workpiece (such as a display module).

[0048] In the panel inspection device 200 described above, when the lens module 120 is performing multi-point imaging on the workpiece under test, the rotation of the first gear 131 can drive the lens module 120 to extend and retract relative to the fixed base 110, thereby adjusting the distance between the lens module 120 and the workpiece under test, and thus adjusting the focal position of the lens module 120, so as to ensure the imaging quality of each point of the workpiece under test by the lens module 120. The lens focusing mechanism 100 provided in this application has two adjacent second gears 132 installed in opposite directions. During installation, one of the second gears 132 can adjust and correct the gear backlash between the other second gear 132 and the first gear 131. When two adjacent second gears 132 are simultaneously meshed in the same tooth groove of the first gear 131, the two adjacent second gears 132 can compensate for the gear backlash between themselves and the first gear 131, so as to adjust the meshing gap between the second gear 132 and the first gear 131 to a smaller value, improve the rotation adjustment accuracy of the first gear 131, and make fine adjustments to the telescopic distance of the lens module 120, so as to further ensure the imaging quality of each point of the workpiece being measured by the lens module 120.

[0049] In one embodiment, see Figure 1 , Figure 2 and Figure 4As shown, the panel inspection device 200 also includes a defect detection module 210 and a colorimetry detection module 220, both of which are mounted on the mounting base 110. The defect detection module 210 receives images acquired by the lens module 120 to detect surface defects in the workpiece under test. When the workpiece has surface defects with uneven brightness, it can promptly eliminate the MURA problem using Demura compensation technology. The colorimetry detection module 220 receives images acquired by the lens module 120 to obtain the image display brightness of the workpiece under test. When there is a deviation between the image display brightness of the workpiece under test and the color brightness perceived by the human eye, it can promptly adjust the image display brightness of the workpiece under test to a level closer to the color brightness observed by the human eye.

[0050] 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.

[0051] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A lens focusing mechanism, characterized in that, The lens focusing mechanism includes: Fixed base; A lens module, wherein the lens module is retractably mounted on the mounting base; and The transmission assembly includes a first gear and a plurality of second gears, the plurality of second gears simultaneously meshing with the same tooth groove of the first gear, and the installation directions of two adjacent second gears being opposite. The first gear is fixed to the lens module, and during the rotation of the first gear, the first gear can drive the lens module to extend and retract relative to the mounting base.

2. The lens focusing mechanism according to claim 1, characterized in that, The transmission assembly further includes a drive element and a transmission shaft. The transmission shaft is connected to the output end of the drive element, and a plurality of second gears are sequentially and intermittently fitted onto the transmission shaft along the axial direction of the transmission shaft.

3. The lens focusing mechanism according to claim 2, characterized in that, One of the two adjacent second gears is fitted onto the drive shaft in a clockwise direction, and the other of the two gears is fitted onto the drive shaft in a counterclockwise direction.

4. The lens focusing mechanism according to any one of claims 2 or 3, characterized in that, There are two second gears, one of which is fixed to the other, and the other is fixed to the drive shaft.

5. The lens focusing mechanism according to claim 1, characterized in that, The lens focusing mechanism also includes a sensing module, which is used to obtain the rotation angle of the first gear.

6. The lens focusing mechanism according to claim 5, characterized in that, The sensing module includes a sensor and a sensing plate. The sensor is disposed on the fixed base, and the sensing plate is disposed on the first gear. During the rotation of the first gear, the sensor can acquire the position information of the sensing plate.

7. The lens focusing mechanism according to claim 1, characterized in that, The lens module includes a lens barrel and a lens disposed within the lens barrel. The lens barrel is telescopically disposed on the fixed base. The first gear is sleeved on the outside of the lens barrel. The lens is used to acquire an image of the workpiece being measured.

8. The lens focusing mechanism according to claim 7, characterized in that, The mounting base includes a base body and a mounting bracket protruding from the base body. The lens barrel is screwed onto the mounting bracket and can move in the direction of extending out of or retracting from the mounting bracket.

9. A panel detection device, characterized in that, The panel detection device includes the lens focusing mechanism as described in any one of claims 1-8.

10. The panel inspection device according to claim 9, characterized in that, The panel inspection device also includes a defect detection module and a colorimetry detection module; Both the defect detection module and the colorimetry detection module are mounted on the fixed base, and the defect detection module and the colorimetry detection module can receive the images acquired by the lens module.

Images