Fine adjustment method of high-precision optical focusing camera module

Abstract

The invention discloses a fine adjustment method for a high-precision optical focusing camera module, and the method comprises the steps: carrying out the glue drawing operation after an AA optical focusing technology is completed; after glue painting is completed, a fine-tuning focus searching function is started again, a lens is finely tuned through a high-precision optical sensor and a fine-tuning mechanism, and Z-axis coordinates at the position of the optimal clear point are moved by a rated distance in the negative direction to serve as a focus searching starting point; the Z axis begins to seek focus in the positive direction at the rated step pitch of 1 micrometer; according to the focus searching data, after calculation of an AA focusing processing system, the Ty / Tx / Tz / Theta attitude of the Lens is automatically adjusted; and comparing the fine-tuned optimal clear point position with the SFR image analysis value of the optimal clear point position of the Fire AA check before glue drawing. When the difference is larger than + / -0.5, overall material throwing of the camera is executed; and when the SFR score of the optimal clear point before and after glue painting exceeds the set specification, judging that the camera is bad. An operator is reminded in a material throwing mode to intervene immediately, and abnormity is corrected.

Description

Technical Field

[0001] The present invention relates to the field of camera module assembly, and in particular to a fine-tuning method for a high-precision optical focus camera module. Background Art

[0002] Conventional camera module lens assembly uses optical focus automatic calibration software algorithm logic. The process is a non-contact (lens and bracket suspended) AA focus search process. Its disadvantages are: glue is applied after optical focus, and there is no optical focus after glue application. As a result, the optical focus is affected by the reverse force of the bonding glue non-Newtonian fluid, especially for lenses and large-size camera modules, resulting in low focusing accuracy; the finished camera module cannot stay at the best clear point, and its DOF ​​(Depth of Field) best clear point fluctuation range is greater than ±3um. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides a fine-tuning method for a high-precision optical focus camera module, which improves the focusing accuracy.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A fine-tuning method for a high-precision optical focus camera module, characterized in that: based on an AA device, it also includes the following steps:

[0006] S1. Position the camera module on the AA device and initialize the device.

[0007] S2, parts loading, the QR code of the Lens and Sensor of the camera module is bound to the system, if the binding is successful, go to step S3, if the binding fails, go to step S130;

[0008] S3, check the switch control of the ICR of the camera module between infrared light mode and visible light mode;

[0009] S4, the first AA, the Z axis of the AA device drives the sensor to focus forward, and calculates the SFR image resolution values ​​of the center and four corners with the standard version imaging diagram to obtain a complete focus process curve; and based on the obtained focus data, the AA focus processing system is calculated to automatically adjust the Ty / Tx / Tz / Tθ posture of the Lens, and determine whether the best clear point position is reached. If so, go to step S5, if not, go to step S110;

[0010] S5, obtaining a frame of SFR image resolution value at the best clear point position;

[0011] S6, using a white light source to obtain an image of the white light source, and performing optical center calibration of the sensor in the X and Y axis directions;

[0012] S7, return to the best clear point position again, obtain a frame of SFR image resolution value, and determine whether it meets the preset specifications, if yes, go to step S8, if not, go to step S10;

[0013] S8, the sensor moves to the glue painting position to complete the UV glue painting. If the glue painting fails, it goes to step S140;

[0014] S9, return to the best clear point position again, obtain a frame of SFR image resolution value, and determine whether it meets the preset specifications, if yes, go to step S10, if not, go to step S150;

[0015] S10, using a white light source to obtain an image of the white light source;

[0016] S11, start fine-tuning the focus again near the clear point, move the Z-axis coordinate of the best clear point position in the negative direction by a predetermined distance as the focus starting point, start focusing in the positive direction along the Z axis with a rated step of 1μm, and automatically adjust the Ty / Tx / Tz / Tθ posture of the Lens based on the acquired focus data and after calculation by the AA focus processing system, compare the fine-tuned best clear point position with the SFR image resolution value of the best clear point position in step S9, and if the difference value is within the range of ±0.5 minutes, proceed to step S12, and if the difference value is greater than ±0.5 minutes, proceed to step S150;

[0017] S12, compensation in Z axis direction;

[0018] S13, UV light irradiates UV glue to pre-cure it and keep the structure stable;

[0019] S14, open the Lens and Sensor stabilization mechanism;

[0020] S15, finally obtaining a frame of SFR image analysis value, judging whether it meets the preset specification, if yes, then completing; if no, proceeding to step S150;

[0021] S110, the second AA, the Z axis of the AA device drives the sensor to focus forward, and calculates the SFR image resolution values ​​of the center and the four corners with the standard version imaging diagram to obtain a complete focus process curve; and based on the obtained focus data, the AA focus processing system is calculated to automatically adjust the Ty / Tx / Tz / Tθ posture of the Lens, and determine whether the best clear point position is reached. If so, go to step S5, if not, go to step S120;

[0022] S120, the third AA, the Z axis of the AA device drives the sensor to focus forward, and calculates the SFR image resolution values ​​of the center and the four corners with the standard version imaging diagram to obtain a complete focus process curve; and based on the obtained focus data, the AA focus processing system is calculated to automatically adjust the Ty / Tx / Tz / Tθ posture of the Lens, and determine whether the best clear point position is reached. If so, go to step S5, if not, go to step S130;

[0023] S130, executing the Lens throwing process and replacing the Lens;

[0024] S140, executing the PCB board throwing process;

[0025] S150, executing the camera module whole machine throwing process.

[0026] Furthermore, in step S120, when the predetermined specifications cannot be met, a Lens material throwing process or a PCB board material throwing process is executed.

[0027] Furthermore, in any of steps 1-7, if the sensor cannot light up or the lens cannot meet the specifications after being replaced twice in succession, the PCB board discarding process is executed.

[0028] The beneficial effects of the present invention include: by adding a clear point near the glue after painting, the "fine-tuning focus search" function is again used to achieve precision control of less than um level, so that the fluctuation range of the DOF best clear point at the final stop position is less than ±1um. In addition, the instability abnormality in the AA process can be automatically detected to avoid batch quality accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0031] A kind of Figure 1 The fine-tuning method of the high-precision optical focus camera module shown in the figure assembles a 5MP camera module based on the AA device, and also includes the following steps:

[0032] S1. Position the camera module on the AA device and initialize the device.

[0033] S2, parts loading, the QR code of the Lens and Sensor of the camera module is bound to the system, if the binding is successful, go to step S3, if the binding fails, go to step S130;

[0034] S3, check the switch control of the ICR of the camera module between infrared light mode and visible light mode;

[0035] S4, the first AA, the Z axis of the AA device drives the sensor to focus forward, and calculates the SFR image resolution values ​​of the center and four corners with the standard version imaging diagram to obtain a complete focus process curve; and based on the obtained focus data, the AA focus processing system is calculated to automatically adjust the Ty / Tx / Tz / Tθ posture of the Lens, and determine whether the best clear point position is reached. If so, go to step S5, if not, go to step S110;

[0036] S5, obtaining a frame of SFR image resolution value at the best clear point position;

[0037] S6, using a white light source to obtain an image of the white light source, and performing optical center calibration of the sensor in the X and Y axis directions;

[0038] S7, return to the best clear point position again, obtain a frame of SFR image resolution value, and determine whether it meets the preset specifications, if yes, go to step S8, if not, go to step S10;

[0039] S8, the sensor moves to the glue painting position to complete the UV glue painting. If the glue painting fails, it goes to step S140;

[0040] S9, return to the best clear point position again, obtain a frame of SFR image resolution value, and determine whether it meets the preset specifications, if yes, go to step S10, if not, go to step S150;

[0041] S10, using a white light source to obtain an image of the white light source;

[0042] S11, start fine-tuning the focus again near the clear point, move the Z-axis coordinate of the best clear point position in the negative direction by a predetermined distance as the focus starting point, start focusing in the positive direction along the Z axis with a rated step of 1μm, and automatically adjust the Ty / Tx / Tz / Tθ posture of the Lens based on the acquired focus data and after calculation by the AA focus processing system, compare the fine-tuned best clear point position with the SFR image resolution value of the best clear point position in step S9, and if the difference value is within the range of ±0.5 minutes, proceed to step S12, and if the difference value is greater than ±0.5 minutes, proceed to step S150;

[0043] S12, compensation in Z axis direction;

[0044] S13, UV light irradiates UV glue to pre-cure it and keep the structure stable;

[0045] S14, open the Lens and Sensor stabilization mechanism;

[0046] S15, finally obtaining a frame of SFR image analysis value, judging whether it meets the preset specification, if yes, then completing; if no, proceeding to step S150;

[0047] S110, the second AA, the Z axis of the AA device drives the sensor to focus forward, and calculates the SFR image resolution values ​​of the center and the four corners with the standard version imaging diagram to obtain a complete focus process curve; and based on the obtained focus data, the AA focus processing system is calculated to automatically adjust the Ty / Tx / Tz / Tθ posture of the Lens, and determine whether the best clear point position is reached. If so, go to step S5, if not, go to step S120;

[0048] S120, the third AA, the Z axis of the AA device drives the sensor to focus forward, and calculates the SFR image resolution values ​​of the center and the four corners with the standard version imaging diagram to obtain a complete focus process curve; and based on the obtained focus data, the AA focus processing system is calculated to automatically adjust the Ty / Tx / Tz / Tθ posture of the Lens, and determine whether the best clear point position is reached. If so, go to step S5, if not, go to step S130;

[0049] S130, executing the Lens throwing process and replacing the Lens;

[0050] S140, executing the PCB board throwing process;

[0051] S150, executing the camera module whole machine throwing process.

[0052] In step S120, when the predetermined specifications cannot be met, the Lens material throwing process or the PCB board material throwing process is executed.

[0053] In any of steps 1-7, if the sensor cannot light up or the lens cannot meet the specifications after two consecutive changes, the PCB board discarding process is performed.

[0054] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A fine-tuning method for a high-precision optical focus camera module, characterized in that: Based on the AA device, the following steps are also included: S1. Position the camera module on the AA device and initialize the device. S2, parts loading, the QR code of the Lens and Sensor of the camera module is bound to the system, if the binding is successful, go to step S3, if the binding fails, go to step S130; S3, check the switch control of the ICR of the camera module between infrared light mode and visible light mode; S4, the first AA, the Z axis of the AA device drives the sensor to focus forward, and calculates the SFR image resolution values ​​of the center and four corners with the standard version imaging diagram to obtain a complete focus process curve; and based on the obtained focus data, the AA focus processing system is calculated to automatically adjust the Ty / Tx / Tz / Tθ posture of the Lens, and determine whether the best clear point position is reached. If so, go to step S5, if not, go to step S110; S5, obtaining a frame of SFR image resolution value at the best clear point position; S6, using a white light source to obtain an image of the white light source, and performing optical center calibration of the sensor in the X and Y axis directions; S7, return to the best clear point position again, obtain a frame of SFR image resolution value, and determine whether it meets the preset specifications, if yes, go to step S8, if not, go to step S10; S8, the sensor moves to the glue painting position to complete the UV glue painting. If the glue painting fails, it goes to step S140; S9, return to the best clear point position again, obtain a frame of SFR image resolution value, and determine whether it meets the preset specifications, if yes, go to step S10, if not, go to step S150; S10, using a white light source to obtain an image of the white light source; S11, start fine-tuning the focus again near the clear point, move the Z-axis coordinate of the best clear point position in the negative direction by a predetermined distance as the focus starting point, start focusing in the positive direction along the Z axis with a rated step of 1μm, and automatically adjust the Ty / Tx / Tz / Tθ posture of the Lens based on the acquired focus data and after calculation by the AA focus processing system, compare the fine-tuned best clear point position with the SFR image resolution value of the best clear point position in step S9, and if the difference value is within the range of ±0.5 minutes, proceed to step S12, and if the difference value is greater than ±0.5 minutes, proceed to step S150; S12, compensation in Z-axis direction; S13, UV light irradiates UV glue to pre-cure it and keep the structure stable; S14, open the Lens and Sensor stabilization mechanism; S15, finally obtaining a frame of SFR image analysis value, judging whether it meets the preset specification, if yes, then completing; if no, proceeding to step S150; S110, the second AA, the Z axis of the AA device drives the sensor to focus forward, and calculates the SFR image resolution values ​​of the center and the four corners with the standard version imaging diagram to obtain a complete focus process curve; and based on the obtained focus data, the AA focus processing system is calculated to automatically adjust the Ty / Tx / Tz / Tθ posture of the Lens, and determine whether the best clear point position is reached. If so, go to step S5, if not, go to step S120; S120, the third AA, the Z axis of the AA device drives the sensor to focus forward, and calculates the SFR image resolution values ​​of the center and the four corners with the standard version imaging diagram to obtain a complete focus process curve; and based on the obtained focus data, the AA focus processing system is calculated to automatically adjust the Ty / Tx / Tz / Tθ posture of the Lens, and determine whether the best clear point position is reached. If so, go to step S5, if not, go to step S130; S130, executing the Lens throwing process and replacing the Lens; S140, executing the PCB board throwing process; S150, executing the camera module whole machine throwing process.

2. The fine-tuning method of a high-precision optical focus camera module according to claim 1, characterized in that: In step S120, when the predetermined specifications cannot be met, the Lens material throwing process or the PCB board material throwing process is executed.

3. The fine-tuning method of a high-precision optical focus camera module according to claim 1, characterized in that: In any of steps 1-7, if the sensor cannot light up or the lens cannot meet the specifications after two consecutive changes, the PCB board discarding process is performed.

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