Machine vision light source uniformity evaluation device and method

Abstract

The invention discloses a machine vision light source uniformity evaluation device and method, and relates to the field of light source uniformity evaluation, the machine vision light source uniformity evaluation device comprises a bottom frame, the top of the bottom frame is fixedly provided with a top box, a movable cavity is reserved in the top box, the lower end part of the movable cavity is communicated with an extension groove, and the top box is also internally provided with an oil cavity; the side wall of the top box is fixedly connected with a driving motor, an output shaft of the driving motor is in transmission connection with a first threaded rod, the outer ring of the first threaded rod is in threaded connection with a movable block, the movable block slides in the movable cavity and the extension groove, and the lower end of the movable block is fixedly connected with a side connecting plate. The driving motor drives the first threaded rod to rotate, so that the two movable blocks in threaded connection with the two sections of threads on the outer ring of the first threaded rod move in the opposite directions or away from each other, the two movable blocks move in the opposite directions and enter the bottom frame to form a closed space, and therefore the light source of the surrounding environment is single; and the uniformity detection effect of the to-be-detected surface light source is better.

Description

Technical Field

[0001] The present invention relates to the field of light source uniformity evaluation, and in particular to a device and method for machine vision light source uniformity evaluation. Background Art

[0002] Light source uniformity plays a crucial role in various fields. A uniform light source can overcome ambient light interference and ensure image stability. A stable and uniform light source ensures consistent input data quality under varying ambient light conditions, thus ensuring the proper operation of machine vision systems.

[0003] Existing Chinese patent authorization publication number: CN109443707A, discloses a device for measuring the brightness uniformity of a surface light source, comprising a first platform, a second platform, a third platform, a third platform motion assembly, a light collection unit, a light collection control unit, and a brightness display unit. The second platform is disposed on the first platform, and the surface light source is disposed on the second platform. The second platform has a three-degree-of-freedom adjustment function for adjusting the surface light source to a horizontal state. The third platform is disposed on the first platform via a bracket. The third platform motion assembly includes an XY axis assembly disposed within the third platform, an XY axis drive assembly connected to the XY axis assembly, and a Z axis drive assembly for controlling the vertical movement of the third platform along the bracket. The light collection unit is mounted on the XY axis assembly of the third platform, with its photosensitive surface facing the surface light source. The light collection unit is connected to the light collection control unit, which is in turn connected to the brightness display unit. This measuring device is simple and convenient to operate, has a smart design, is highly versatile, and has low measurement error.

[0004] The above-mentioned surface light source brightness uniformity detection device still has the following problems when in use: when the above-mentioned device implements evaluation and detection, the working environment of the entire device is relatively open, which may cause the external ambient light source to affect the detection result.

[0005] Therefore, it is necessary to invent a machine vision light source uniformity evaluation device and method to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a machine vision light source uniformity evaluation device and method to solve the problem that when the above-mentioned device proposed in the background technology implements evaluation and detection, the working environment of the entire device is relatively open, which may cause the external ambient light source to affect the detection results.

[0007] In order to achieve the above-mentioned objectives, the present invention provides the following technical solutions: a machine vision light source uniformity evaluation device, comprising a bottom frame, a top box fixedly installed on the top of the bottom frame, a movable cavity reserved inside the top box, and the lower end of the movable cavity is connected to an extension groove, and an oil cavity is also provided inside the top box, the side wall of the top box is fixedly connected to a driving motor, and the output shaft of the driving motor is transmission-connected to a threaded rod 1, and the outer ring of the threaded rod 1 is threadedly connected to a movable block, and the movable block slides inside the movable cavity and the extension groove, the lower end of the movable block is fixedly connected to a side connecting plate, and an imaging luminance meter is fixedly installed on the outer wall of one side connecting plate, and a surface light source to be detected is installed inside the other side connecting plate through an installation component, and the oiling component and the ejection component on demand are used to realize the lubrication operation of the threaded connection between the threaded rod 1 and the movable block inside the oil cavity.

[0008] Preferably, the bottom frame is in a square "U" shape, and the inner wall of the bottom frame is in contact with the outer wall of the side connecting plate and is slidably connected to facilitate the movement of the side connecting plate inside the bottom frame, thereby creating a closed space for uniformity evaluation of the light source.

[0009] Preferably, the outer ring of the threaded rod 1 is provided with two sections of threads with opposite screw directions, and the two threads are respectively threadedly connected with two symmetrically arranged movable blocks, and the movable blocks are in a "T" shape. The outer wall of the movable block is in contact with the inner wall of the movable cavity and the inner wall of the extension groove to achieve a sliding connection. At the same time, there is a gap between the top of the movable block and the top of the movable cavity. When the threaded rod 1 is driven to rotate, the two movable blocks can move toward or away from each other, which is convenient for adjusting the distance between the imaging luminance meter and the surface light source to be measured.

[0010] Preferably, the mounting assembly includes a vertical slot preset inside a side connecting plate, and the inner wall of the vertical slot is rotatably connected to a second threaded rod, and the lower end of the second threaded rod extends to a notch reserved at the bottom of the side connecting plate;

[0011] The installation assembly also includes an abutment block that is slidably connected to the side wall of the side connecting plate, wherein two abutment blocks are symmetrically arranged above and below, and the inclined surfaces arranged at the opposite ends of the two abutment blocks abut against the upper and lower ends of the surface light source, and a fixed block is fixedly connected to one side wall of the abutment block, and the fixed block is threadedly connected to the threaded rod 2 and slides inside the vertical groove, so as to facilitate the installation of the surface light source.

[0012] Preferably, the on-demand oiling component includes two symmetrically arranged oil outlets arranged at the bottom of the oil chamber, wherein a block is fittedly installed inside the oil outlet, a long rod is fixedly connected to the top of the block, and a cover plate is movably installed on the top of the long rod, and the special-shaped rod fixedly connected to the side of the cover plate slides inside the limiting groove reserved inside the top box, and the spring applies pressure to the cover plate so that the cover plate supports the block and the oil outlet, which facilitates the subsequent ejection component to movably lift the block to realize the reset movement after oiling.

[0013] Preferably, the blocking block is in a pointed cone shape, and a plane is provided at the lower end of the blocking block, and the lower end of the blocking block cooperates with the ejection assembly to realize the oil outlet operation.

[0014] Preferably, the upper end of the long rod extends to the top of the top box and is connected to the top box in an up and down sliding manner, and the upper end of the long rod is against the cover plate. A columnar buffer cavity is reserved inside the long rod, and the bottom of the buffer cavity is in a pointed cone shape. The buffer cavity is connected to the notch provided inside the long rod, and the notch is connected to the oil cavity, which makes it convenient to inject the lubricating oil into the buffer cavity and then leak it into the oil cavity through the notch.

[0015] Preferably, the special-shaped rod is in an inverted "T" shape, and the outer wall of the special-shaped rod is in contact with the inner wall of the limiting groove and is connected to slide up and down. The outer ring of the special-shaped rod is movably sleeved with a spring, and the upper and lower ends of the spring are fixedly connected to the cover plate and the top of the top box respectively.

[0016] Preferably, the ejection assembly includes a conical cavity preset inside the movable block, and the inner wall of the conical cavity is fixedly connected to the ejection block through a connecting block, and the ejection block is in a pointed cone shape, and there is a gap between the edge of the ejection block and the conical cavity body. At the same time, the top of the ejection block is higher than the top of the movable block, which facilitates the sliding of the movable block so that the ejection block can move and contact the blocking block and lift the blocking block so that the lubricating oil drips into the inside of the conical cavity through the oil outlet and contacts the threaded rod 1, thereby realizing the lubrication operation of the threaded connection between the threaded rod 1 and the movable block.

[0017] The present invention also provides a method for evaluating the uniformity of a machine vision light source, which uses the above-mentioned machine vision light source uniformity evaluation device. The specific operating steps are as follows:

[0018] Step 1: Fixed installation of the surface light source: Move the threaded rod 2 to drive the fixing block connected to the two sections of the threaded rod 2 in different directions to drive the two abutting blocks to move toward each other. The inclined surfaces provided on the opposite ends of the two abutting blocks abut against the upper and lower ends of the surface light source to fix the surface light source;

[0019] Step 2: The closed space is formed by driving the motor to rotate the threaded rod 1, causing the two movable blocks that are threadedly connected to the two sections of the thread on the outer ring of the threaded rod 1 to move toward or away from each other. The two movable blocks drive the side connecting plates to move toward each other and enter the bottom frame to form a closed space. In this way, the ambient light source is relatively uniform, which is more effective for detecting the uniformity of the surface light source to be tested.

[0020] Step 3: Evaluation and monitoring: The imaging luminance meter detects the uniformity of the light source and transmits the results to the terminal to form a test report.

[0021] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0022] 1. The present invention drives the rotation of the threaded rod 1 by a driving motor, causing the two movable blocks threadedly connected to the two sections of the thread on the outer ring of the threaded rod 1 to move toward or away from each other. The two movable blocks move toward each other and enter the interior of the bottom frame to form a closed space. In this way, the ambient light source is relatively single, and the uniformity detection effect of the light source on the surface to be measured is better. At the same time, the movable block slides to make the top block move and contact the blocking block, and the blocking block is lifted up, so that lubricating oil drips into the interior of the tapered cavity through the oil outlet and contacts the threaded rod 1, thereby achieving lubrication operation of the threaded connection between the threaded rod 1 and the movable block, ensuring smoother movement of the connecting plates on both sides.

[0023] 2. Move the shift block at the lower end of the threaded rod to drive the rotation of the threaded rod, so that the two fixed blocks that are threadedly connected to the two sections of the threaded rod in different directions drive the two abutting blocks to move toward each other, so that the inclined surfaces set at the opposite ends of the two abutting blocks abut against the upper and lower ends of the surface light source, thereby fixing and removing the surface light source, making it convenient to replace different light sources for detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0026] Figure 2 This is an exploded view of the bottom frame and top box connection structure of the present invention;

[0027] Figure 3 A perspective view of the internal structure of the top box of the present invention (partially cut away);

[0028] Figure 4 An exploded view of the connection structure between the top box (partially cut away from the side) and some parts of the on-demand oiling assembly of the present invention;

[0029] Figure 5 This is an exploded view of the overall structure of the installation assembly of the present invention;

[0030] Figure 6 A three-dimensional diagram of the internal structure of the movable block (partially cut away) of the present invention;

[0031] Figure 7 It is a three-dimensional diagram of the internal structure of the long rod (partially cut away) of the present invention.

[0032] Description of reference numerals:

[0033] 1. Bottom frame; 2. Top box; 3. Movable cavity; 4. Extension groove; 5. Oil cavity; 6. Drive motor; 7. Threaded rod 1; 8. Movable block; 9. Side connecting plate; 10. Imaging luminance meter; 11. Mounting assembly; 111. Vertical groove; 112. Abutment block; 113. Fixed block; 114. Threaded rod 2; 115. Notch; 12. On-demand oiling assembly; 121. Oil outlet; 122. Block; 123. Long rod; 124. Cover plate; 125. Special-shaped rod; 126. Spring; 127. Restriction groove; 128. Buffer cavity; 129. Notch; 13. Ejection assembly; 131. Conical cavity; 132. Connecting block; 133. Ejector block. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] The present invention provides Figure 1-7 A machine vision light source uniformity evaluation device shown in the figure includes a bottom frame 1, a top box 2 is fixedly installed on the top of the bottom frame 1, an active cavity 3 is reserved inside the top box 2, and the lower end of the active cavity 3 is connected to an extension groove 4, and an oil cavity 5 is also provided inside the top box 2, the side wall of the top box 2 is fixedly connected to a drive motor 6, and the output shaft of the drive motor 6 is transmission-connected to a threaded rod 7, and the outer ring of the threaded rod 7 is threadedly connected to a movable block 8, the movable block 8 slides inside the active cavity 3 and the extension groove 4, the lower end of the movable block 8 is fixedly connected to a side connecting plate 9, and an imaging luminance meter 10 is fixedly installed on the outer wall of one side connecting plate 9, and the inside of the other side connecting plate 9 is installed with a surface light source to be detected through an installation component 11, and the inside of the oil cavity 5 realizes the lubrication operation of the threaded connection between the threaded rod 7 and the movable block 8 through the on-demand oiling component 12 and the ejection component 13.

[0036] During use, the threaded rod 7 is driven to rotate by the driving motor 6, causing the two movable blocks 8 threadedly connected to the two sections of the thread on the outer circle of the threaded rod 7 to move toward or away from each other. The two movable blocks 8 drive the side connecting plates 9 to move toward each other and enter the bottom frame 1 to form a closed space. In this way, the surrounding light source is relatively single, and the uniformity detection effect of the surface light source to be tested is better. Subsequently, the two movable blocks 8 move away from each other, causing the two side connecting plates 9 to move out of the bottom frame 1, which makes it convenient to remove the surface light source.

[0037] The bottom frame 1 is in a square "U" shape, and the inner wall of the bottom frame 1 is in contact with the outer wall of the side connecting plate 9 and is slidably connected to facilitate the movement of the side connecting plate 9 inside the bottom frame 1, thereby creating a closed space for uniformity evaluation of the light source.

[0038] The outer ring of the threaded rod 7 is provided with two sections of threads with opposite screw directions, and the two threads are respectively threadedly connected with two symmetrically arranged movable blocks 8, and the movable blocks 8 are in a "T" shape. The outer wall of the movable block 8 is in contact with the inner wall of the movable cavity 3 and the inner wall of the extension groove 4 to achieve a sliding connection. At the same time, there is a gap between the top of the movable block 8 and the top of the movable cavity 3.

[0039] In this way, when the threaded rod 7 is driven to rotate, the two movable blocks 8 can move toward or away from each other, which is convenient for adjusting the distance between the imaging luminance meter 10 and the surface light source to be measured. At the same time, the two movable blocks 8 move toward each other and enter the interior of the bottom frame 1 to form a closed space. In this way, the surrounding light source is relatively single, and the uniformity detection effect of the surface light source to be measured is better.

[0040] To facilitate the installation of the surface light source, the installation component 11 includes a vertical groove 111 preset inside a side connecting plate 9, and the inner wall of the vertical groove 111 is rotatably connected to a threaded rod 2 114, and the lower end of the threaded rod 2 114 extends to the notch 115 reserved at the bottom of the side connecting plate 9, which facilitates the manipulation of the threaded rod 2 114, and at the same time, the lower end of the threaded rod 2 114 is flush with the lower end of the side connecting plate 9; the installation component 11 also includes an abutment block 112 that is slidably connected to the side wall of the side connecting plate 9, wherein the abutment blocks 112 are symmetrically arranged in the upper and lower parts, and the opposite ends of the two abutment blocks 112 are provided with inclined surfaces that abut against the upper and lower ends of the surface light source, and a fixed block 113 is fixedly connected to one side wall of the abutment block 112, and the fixed block 113 is threadedly connected to the threaded rod 2 114 and slides inside the vertical groove 111.

[0041] The shifting block at the lower end of the threaded rod 114 drives the threaded rod 114 to rotate, causing the two fixing blocks 113 that are threadedly connected to the two sections of the threaded rod 114 in different directions to drive the two abutting blocks 112 to move toward each other, so that the inclined surfaces provided at the opposite ends of the two abutting blocks 112 abut against the upper and lower ends of the surface light source, thereby fixing the surface light source.

[0042] The on-demand oiling component 12 includes two symmetrically arranged oil outlets 121 at the bottom of the oil chamber 5, wherein a block 122 is fitted inside the oil outlet 121, a long rod 123 is fixedly connected to the top of the block 122, and a cover plate 124 is movably installed on the top of the long rod 123, and a special-shaped rod 125 fixedly connected to the side of the cover plate 124 slides inside the limiting groove 127 reserved inside the top box 2, and the spring 126 applies pressure to the cover plate 124 so that the cover plate 124 supports the block 122 and the oil outlet 121.

[0043] It is convenient for the subsequent ejection component 13 to movably lift the blocking block 122 to achieve the reset movement after oiling.

[0044] The block 122 is in a pointed cone shape, and a flat surface is provided at the lower end of the block 122. The lower end of the block 122 cooperates with the ejection assembly 13 to realize the oil discharge from the oil outlet 121. The upper end of the long rod 123 extends to the top of the top box 2 and is connected to the top box 2 in an up and down sliding manner. The upper end of the long rod 123 is against the cover plate 124. A columnar buffer cavity 128 is reserved inside the long rod 123. The bottom of the buffer cavity 128 is in a pointed cone shape, and the buffer cavity 128 is connected to the notch 129 provided inside the long rod 123, and the notch 129 is connected to the oil cavity 5, which is convenient for injecting lubricating oil into the buffer cavity 128 and then leaking it into the oil cavity 5 through the notch 129.

[0045] The special-shaped rod 125 is in an inverted "T" shape, and the outer wall of the special-shaped rod 125 is in contact with the inner wall of the limiting groove 127 to realize an up and down sliding connection. The outer ring of the special-shaped rod 125 is movably sleeved with a spring 126, and the upper and lower ends of the spring 126 are respectively fixedly connected to the cover plate 124 and the top of the top box 2, so that under the pressure applied by the spring 126, the cover plate 124 is pressed against the top of the long rod 123, thereby making the block 122 block the oil outlet 121, while not affecting the subsequent ejection component 13 to lift and reset the block 122.

[0046] The ejection assembly 13 includes a conical cavity 131 preset inside the movable block 8, and the inner wall of the conical cavity 131 is fixedly connected to a top block 133 through a connecting block 132, and the top block 133 is in the shape of a pointed cone. There is a gap between the edge of the top block 133 and the cavity of the conical cavity 131, and the top of the top block 133 is higher than the top of the movable block 8.

[0047] This facilitates the sliding of the movable block 8 so that the top block 133 moves and contacts the blocking block 122 and lifts the blocking block 122 so that the lubricating oil drips into the inside of the tapered cavity 131 through the oil outlet 121 and contacts the threaded rod 7, thereby realizing the lubrication operation of the threaded connection between the threaded rod 7 and the movable block 8.

[0048] The present invention also provides a method for evaluating the uniformity of a machine vision light source, which uses the above-mentioned machine vision light source uniformity evaluation device. The specific operating steps are as follows:

[0049] Step 1: Fixed installation of the surface light source: Move the second threaded rod 114 to drive the fixing block 113, which is threadedly connected to the two sections of the second threaded rod 114 in different directions, to drive the two abutting blocks 112 to move toward each other. The inclined surfaces provided on the opposite ends of the two abutting blocks 112 abut against the upper and lower ends of the surface light source to fix the surface light source;

[0050] Step 2: Formation of a closed space: The driving motor 6 drives the threaded rod 7 to rotate, causing the two movable blocks 8 that are threadedly connected to the two sections of the thread on the outer ring of the threaded rod 7 to move toward or away from each other. The two movable blocks 8 drive the side connecting plates 9 to move toward each other and enter the interior of the bottom frame 1 to form a closed space. In this way, the ambient light source is relatively uniform, and the uniformity detection effect of the surface light source to be tested is better.

[0051] Step 3: Evaluation and monitoring: The imaging luminance meter 10 detects the uniformity of the light source and transmits the results to the terminal to form a detection report (the detection technology of the imaging luminance meter 10 is an existing and relatively mature technology on the market and will not be repeated here).

[0052] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A machine vision light source uniformity evaluation device, comprising a bottom frame (1), characterized in that: The top of the bottom frame (1) is fixedly mounted with a top box (2), an active cavity (3) is reserved inside the top box (2), and the lower end of the active cavity (3) is connected to an extension groove (4), and an oil cavity (5) is also arranged inside the top box (2), a side wall of the top box (2) is fixedly connected with a driving motor (6), and the output shaft of the driving motor (6) is transmission-connected with a threaded rod (7), and the outer ring of the threaded rod (7) is threadedly connected with a movable block (8), and the movable block (8) slides inside the active cavity (3) and the extension groove (4), the lower end of the movable block (8) is fixedly connected with a side connecting plate (9), and an imaging luminance meter (10) is fixedly mounted on the outer wall of one side connecting plate (9), and a surface light source to be detected is mounted inside the other side connecting plate (9) through an installation component (11), and the oiling component (12) and the ejection component (13) are used inside the oil cavity (5) to realize the lubrication operation of the threaded connection between the threaded rod (7) and the movable block (8).

2. The machine vision light source uniformity evaluation device according to claim 1, characterized in that: The bottom frame (1) is in a square "U" shape, and the inner wall of the bottom frame (1) is in contact with the outer wall of the side connecting plate (9) to achieve a sliding connection.

3. The machine vision light source uniformity evaluation device according to claim 1, characterized in that: The outer ring of the threaded rod (7) is provided with two sections of threads with opposite screw directions, and the two threads are respectively threadedly connected with two symmetrically arranged movable blocks (8), and the movable blocks (8) are in a "T" shape. The outer wall of the movable block (8) is in contact with the inner wall of the movable cavity (3) and the inner wall of the extension groove (4) to achieve a sliding connection, and at the same time, there is a gap between the top of the movable block (8) and the top of the movable cavity (3).

4. The machine vision light source uniformity evaluation device according to claim 2, characterized in that: The mounting assembly (11) includes a vertical groove (111) preset inside a side connecting plate (9), and the inner wall of the vertical groove (111) is rotatably connected to a second threaded rod (114), and the lower end of the second threaded rod (114) extends to a notch (115) reserved at the bottom of the side connecting plate (9); The mounting assembly (11) further includes an abutment block (112) that is slidably connected to the side wall of the side connecting plate (9), wherein two abutment blocks (112) are symmetrically arranged in the upper and lower parts, and the inclined surfaces arranged at the opposite ends of the two abutment blocks (112) abut against the upper and lower ends of the surface light source, and a fixed block (113) is fixedly connected to one side wall of the abutment block (112), and the fixed block (113) is threadedly connected to the second threaded rod (114) and slides inside the vertical groove (111).

5. The machine vision light source uniformity evaluation device according to claim 1, characterized in that: The on-demand oiling assembly (12) includes two symmetrically arranged oil outlets (121) arranged at the bottom of the oil chamber (5), wherein a blocking block (122) is fitted inside the oil outlet (121), a long rod (123) is fixedly connected to the top of the blocking block (122), and a cover plate (124) is movably installed on the top of the long rod (123), and a special-shaped rod (125) fixedly connected to the side of the cover plate (124) slides inside a limiting groove (127) reserved inside the top box (2).

6. The machine vision light source uniformity evaluation device according to claim 5, characterized in that: The blocking block (122) is in a pointed cone shape, and a plane is provided at the lower end of the blocking block (122). The lower end of the blocking block (122) cooperates with the ejection assembly (13) to realize oil discharge from the oil outlet (121).

7. The machine vision light source uniformity evaluation device according to claim 5, characterized in that: The upper end of the long rod (123) extends to the top of the top box (2) and is connected to the top box (2) in an up-and-down sliding manner, and the upper end of the long rod (123) abuts against the cover plate (124). A columnar buffer cavity (128) is reserved inside the long rod (123), and the bottom of the buffer cavity (128) is in a pointed cone shape. The buffer cavity (128) is connected to a notch (129) provided inside the long rod (123), and the notch (129) is connected to the oil cavity (5).

8. The machine vision light source uniformity evaluation device according to claim 5, characterized in that: The special-shaped rod (125) is in an inverted "T" shape, and the outer wall of the special-shaped rod (125) is in contact with the inner wall of the limiting groove (127) to achieve an up-and-down sliding connection. The outer ring of the special-shaped rod (125) is movably sleeved with a spring (126), and the upper and lower ends of the spring (126) are fixedly connected to the cover plate (124) and the top of the top box (2), respectively.

9. The machine vision light source uniformity evaluation device according to claim 6, characterized in that: The ejection assembly (13) includes a conical cavity (131) preset inside the movable block (8), and the inner wall of the conical cavity (131) is fixedly connected to a top block (133) via a connecting block (132), and the top block (133) is in a pointed cone shape, with a gap between the edge of the top block (133) and the cavity of the conical cavity (131), and the top of the top block (133) is higher than the top of the movable block (8).

10. A method for evaluating uniformity of a machine vision light source, using a machine vision light source uniformity evaluation device according to any one of claims 1 to 9, characterized in that: The specific steps are as follows: Step 1: limited installation of the surface light source, the threaded rod 2 (114) is moved to drive the fixing block (113) which is threadedly connected to the threaded rod 2 (114) with two different threads to drive the two abutting blocks (112) to move toward each other, and the inclined surfaces provided on the opposite ends of the two abutting blocks (112) are abutted against the upper and lower ends of the surface light source to achieve the fixation of the surface light source; Step 2: The closed space is formed by driving the threaded rod (7) by the driving motor (6), so that the two movable blocks (8) connected with the two sections of the thread of the outer ring of the threaded rod (7) are threadedly connected to each other or move away from each other. The two movable blocks (8) drive the side connecting plates (9) to move toward each other and enter the bottom frame (1) to form a closed space. In this way, the ambient light source is relatively uniform, and the uniformity detection effect of the surface light source to be tested is better. Step 3: Evaluation and monitoring: the imaging luminance meter (10) detects the uniformity of the light source and transmits the results to the terminal to form a detection report.

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