A MTF value test fixture for camera module

Abstract

The utility model discloses an MTF value test fixture for a camera module, comprising: a bracket, a teleconverter frame and a conveying mechanism; a central light tube mounting hole is provided on the top of the bracket, the central light tube mounting hole is used to mount the central light tube, the teleconverter frame can be horizontally rotatably arranged on the bracket, the central light tube mounting hole can be on the same straight line as the teleconverter frame, the bracket can be slidably arranged on the conveying mechanism, the conveying mechanism is used to drive the bracket, so that the teleconverter and the central light tube can be switched to test the camera module, and the MTF value test fixture of the camera module can save the number and loss of the central light tube, thereby reducing the test cost.

Description

Technical Field

[0001] The utility model relates to the field of test fixtures, in particular to an MTF value test fixture for a camera module. Background Art

[0002] Camera modules have become common components of mobile phones, tablets and other devices with display screens. Before shipping, camera modules need to undergo a series of tests, such as testing the MTF values ​​of camera modules at different distances to obtain the relationship curve between MTF and test distance, and then determine the highest point of MTF value at the corresponding distance. However, the staff needs to test the MTF values ​​of multiple camera modules at different distances, but a central light tube can only test the MTF value at one field of view, and different central light tubes need to be replaced. The central light tube is expensive, and the loss cost of the test equipment is high. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a MTF value test fixture for a camera module.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A MTF value test fixture for a camera module comprises: a bracket, a teleconverter frame and a conveying mechanism; a central light tube mounting hole is provided on the top of the bracket, the central light tube mounting hole is used to mount the central light tube, the teleconverter frame can be horizontally rotatably arranged on the bracket, so that the teleconverter and the central light tube can be switched for testing, the central light tube mounting hole can be in the same straight line as the teleconverter frame, the bracket can be slidably arranged on the conveying mechanism, and the conveying mechanism is used to drive the bracket.

[0006] In one embodiment, the conveying mechanism includes a driving assembly, a conveying platform, a connecting block and a screw rod; the screw rod is arranged on the conveying platform, the connecting block is slidably connected to the screw rod, the top of the connecting block is connected to the bracket, and the driving assembly drives the screw rod to drive the connecting block to move.

[0007] In one embodiment, the driving component is a motor.

[0008] In one embodiment, the motor is arranged at one end of the bracket, and the central light tube and the teleconverter frame are arranged at the other end of the bracket.

[0009] In one embodiment, limit stops are provided on both sides of the conveying platform.

[0010] In one embodiment, two sides of the teleconverter frame extend outwardly from a toggle handle.

[0011] In one embodiment, the toggle handles are symmetrically arranged.

[0012] In one embodiment, the bracket includes a support plate, which is disposed below the conveying mechanism and is used to support the conveying mechanism.

[0013] In one embodiment, support blocks extend outwardly from both sides of the bottom of the support plate.

[0014] In one embodiment, the support plate is made of stainless steel.

[0015] Compared with the prior art, the utility model has at least the following advantages:

[0016] The MTF value test fixture of the camera module of the utility model is provided with a bracket, a teleconverter frame and a conveying mechanism. A central light tube mounting hole for mounting a central light tube is provided on the top of the bracket. The teleconverter frame can be horizontally rotatably arranged on the bracket. The teleconverter frame is used to mount the teleconverter. The central light tube mounting hole can be on the same straight line as the teleconverter frame. The difference between the central MTF obtained by the central parallel light tube and the central MTF obtained by the teleconverter can be compared, so that the teleconverter and the central light tube can be switched to test the camera module. The use of the MTF value test fixture of the camera module can save the number and loss of the central light tube, thereby reducing the testing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.

[0018] Figure 1 Schematic diagram of the structure of the MTF value test fixture of the camera module in one embodiment of the utility model.

[0019] Reference numerals:

[0020] The camera module includes an MTF value test fixture 100, a bracket 10, a teleconverter frame 11, a central light tube mounting hole 12, a conveying mechanism 20, a driving assembly 21, a conveying platform 22, a limit stop block 23, a toggle handle 24, a support plate 30, and a support block 31. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0022] This application proposes a MTF value test fixture 100 for a camera module, see Figure 1, including: a bracket 10, a teleconverter frame 11 and a conveying mechanism 20. A central light tube mounting hole 12 is provided on the top of the bracket 10, and the central light tube mounting hole 12 is used to install the central light tube. The teleconverter frame 11 can be horizontally rotatably arranged on the bracket 10, and the teleconverter frame 11 is used to install the teleconverter. The central light tube mounting hole 12 can be in the same straight line as the teleconverter frame 11, and the bracket 10 can be slidably arranged on the conveying mechanism 20, and the conveying mechanism 20 is used to drive the bracket 10. The teleconverter and the central light tube can be switched to test the camera module, and the MTF value test fixture 100 using the camera module can save the number and loss of the central light tube, thereby reducing the test cost.

[0023] It should be noted that the staff first installed the central light tube in the central light tube installation hole 12, and placed the camera module to be tested at the bottom of the central light tube. After the central light tube and the camera module were aligned, the central light tube was used to test the group of data, and the central light tube was removed. Then, the staff rotated the teleconverter frame 11 to align with the camera module to be tested, placed the teleconverter on the teleconverter frame 11, and tested multiple groups of data by adjusting the teleconverter. The central light tube can test the camera module's larger field of view, and the teleconverter can test the camera module's resolution at different distances, even at infinity.

[0024] In one embodiment, see Figure 1 The conveying mechanism 20 includes a driving assembly 21, a conveying platform 22, a connecting block and a screw. The screw is arranged on the conveying platform 22, and the connecting block is slidably connected to the screw. The upper part of the connecting block is connected to the bracket 10, and the driving assembly 21 is used to drive the screw to drive the connecting block to move. The side of the screw is provided with a thread. When the driving assembly 21 drives the screw to rotate, the screw drives the connecting block to move horizontally, thereby driving the bracket 10 and the central light tube mounting hole 12 thereon to align with the teleconverter on the teleconverter frame 11, so that the central light tube mounting hole 12 can be consistent with the center of the teleconverter frame 11, thereby switching the use of the central light tube mounting hole 12 and the teleconverter frame 11. Preferably, the driving assembly 21 is a motor.

[0025] Specifically, see Figure 1 The motor is arranged at one end of the bracket 10, and the central light tube and the teleconverter frame 11 are arranged at the other end of the bracket 10, so that the center of gravity of the MTF value test fixture 100 of the camera module is kept balanced to prevent the MTF value test fixture 100 of the camera module from tipping over to one side.

[0026] Furthermore, limit stops 23 are provided on both sides of the conveying platform 22 to prevent the bracket 10 from being separated from the conveying platform 22 after being driven. When the bracket 10 moves to the edge of the conveying platform 22, the limit stops 23 limit the bracket 10 to prevent the central light pipe or the teleconverter on the bracket 10 from being damaged. In another embodiment, a limit switch is provided on the conveying platform 22 to prevent the connection block from always hitting the limit stops 23 when moving at both ends, thereby affecting the performance of the central light pipe and the teleconverter. The connection block is controlled by software, and braking is started when the connection block is about to hit the limit stops 23, thereby protecting the functions of the central light pipe and the teleconverter.

[0027] In a preferred embodiment, see Figure 1 The two sides of the teleconverter frame 11 extend outwardly with a toggle handle 24, so that the tester can easily rotate the teleconverter frame 11 by turning the toggle handle 24, thereby avoiding contamination of the teleconverter and affecting the test results.

[0028] Furthermore, the toggle handles 24 are symmetrically arranged so that the tester can toggle the toggle handle 24 on one side at will.

[0029] In another embodiment, see Figure 1 The bracket 10 includes a support plate 30, which is arranged below the conveying mechanism 20. The support plate 30 is used to support the conveying mechanism 20. When the conveying mechanism 20 is working, the conveying mechanism 20 directly contacts the workbench, which will cause the central light tube and the teleconverter to be misaligned with the camera module to be tested, affecting the accuracy of the camera module test result.

[0030] Furthermore, support blocks 31 extend outward from both sides of the bottom of the support plate 30 to increase the contact area between the support plate 30 and the workbench, so that the MTF value test fixture 100 of the camera module placed on the workbench is more stable.

[0031] In addition, the support plate 30 is made of stainless steel, which prevents the support plate 30 from being corroded and causing pollution to the workbench, and can extend the service life of the fixture.

[0032] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A MTF value test fixture for a camera module, characterized in that: include: Brackets, teleconverter frames and transport mechanisms; A central light tube mounting hole is provided at the top of the bracket, and the central light tube mounting hole is used to mount the central light tube. The teleconverter frame can be horizontally rotatably arranged on the bracket, so that the teleconverter and the central light tube can be switched for testing. The central light tube mounting hole can be consistent with the center of the teleconverter frame. The bracket can be slidably arranged on the conveying mechanism, and the conveying mechanism is used to drive the bracket.

2. The MTF value test fixture of the camera module according to claim 1, characterized in that: The conveying mechanism includes a driving assembly, a conveying platform, a connecting block and a screw rod; The screw rod is arranged on the conveying platform, the connecting block is slidably connected to the screw rod, the upper part of the connecting block is connected to the bracket, and the driving component drives the screw rod to drive the connecting block to move.

3. The MTF value test fixture of the camera module according to claim 2, characterized in that: The driving component is a motor.

4. The MTF value test fixture of the camera module according to claim 3, characterized in that: The motor is arranged at one end of the bracket, and the central light tube and the teleconverter frame are arranged at the other end of the bracket.

5. The MTF value test fixture of the camera module according to claim 2, characterized in that: Limiting blocks are arranged on both sides of the conveying platform.

6. The MTF value test fixture of the camera module according to claim 1, characterized in that: Toggle handles extend outward from both sides of the teleconverter frame.

7. The MTF value test fixture of the camera module according to claim 6, characterized in that: The toggle handles are symmetrically arranged.

8. The MTF value test fixture of the camera module according to claim 1, characterized in that: The bracket includes a support plate, which is arranged below the conveying mechanism and is used to support the conveying mechanism.

9. The MTF value test fixture of the camera module according to claim 8, characterized in that: Support blocks extend outwardly from both sides of the bottom of the support plate.

10. The MTF value test fixture of the camera module according to claim 8, characterized in that: The support plate is made of stainless steel.

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