CN111879499B - Optical image stabilization performance test method for camera driving motor - Google Patents

Optical image stabilization performance test method for camera driving motor Download PDF

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Publication number
CN111879499B
CN111879499B CN202011037048.1A CN202011037048A CN111879499B CN 111879499 B CN111879499 B CN 111879499B CN 202011037048 A CN202011037048 A CN 202011037048A CN 111879499 B CN111879499 B CN 111879499B
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driving motor
camera driving
ois
camera
hall
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CN111879499A (en
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张超
吴志江
张启
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Changzhou Ruitai Photoelectric Co Ltd
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Changzhou Ruitai Photoelectric Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M7/00—Vibration-testing of structures; Shock-testing of structures
    • G01M7/02—Vibration-testing by means of a shake table
    • G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M7/00—Vibration-testing of structures; Shock-testing of structures
    • G01M7/02—Vibration-testing by means of a shake table
    • G01M7/025—Measuring arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M7/00—Vibration-testing of structures; Shock-testing of structures
    • G01M7/02—Vibration-testing by means of a shake table
    • G01M7/027—Specimen mounting arrangements, e.g. table head adapters

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  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Studio Devices (AREA)
  • Adjustment Of Camera Lenses (AREA)

Abstract

The invention provides a method for testing optical image stabilization performance of a camera driving motor, which comprises the following steps: installing a camera driving motor on a test tool, and electrically connecting the camera driving motor with the X, Y direction displacement monitoring module and the OIS driving module respectively; starting an OIS driving module to enable a camera driving motor and the OIS driving module to form an OIS closed-loop control system; starting X, Y direction displacement monitoring module to obtain X, Y direction initial position data of the camera driving motor; starting a shaking table; obtaining real-time X, Y direction displacement data of a camera driving motor through an X, Y direction displacement monitoring module; and analyzing the data in the X direction and the data in the Y direction by the upper computer to judge whether the OIS performance reaches the standard or not. Compared with the prior art, the method for testing the optical image stabilization performance of the camera driving motor has good reliability, effectively increases the production efficiency, and reduces the production cost and the risk of reject ratio.

Description

Optical image stabilization performance test method for camera driving motor
Technical Field
The present invention relates to a test method, and more particularly, to a test method for optical image stabilization performance of a camera driving motor applied in the field of portable camera electronic products.
Background
In recent years, micro motor control systems with an OIS (Optical Image Stabilization) function have been adopted by many high-end mobile phone camera modules. In order to ensure that the camera module has excellent OIS performance, a camera module factory usually tests the actual imaging effect of a camera module sample on a shaking vibration table before shipment, and uses a calculated SR (Suppression Ratio) parameter as a criterion for determining whether the OIS performance is good or bad. According to the evaluation method, the camera module and the gyroscope are required to be installed on the signal transfer module and are jointly fixed on the shaking vibration table, and only after the camera module is completely assembled, the camera module can be successfully carried out by normal power-on shooting and group image analysis, but the OIS performance of a camera driving motor (a motor monomer) in the camera module cannot be evaluated in the feeding stage, so that once the OIS performance of the camera driving motor does not reach the standard, an assembled camera module sample is scrapped, and the risk that the production yield does not reach the standard is increased; meanwhile, assembly again after reworking and debugging the OIS control parameters also causes low production efficiency and increased production cost.
Therefore, it is necessary to provide a new method for testing the optical image stabilization performance of the camera driving motor to solve the above problems.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for testing the optical image stabilization performance of a camera driving motor, which can be used for carrying out an OIS (optical input/output) performance test on the camera driving motor in a material feeding stage before a camera module is completely assembled, thereby effectively increasing the production efficiency, reducing the production cost and effectively controlling the risk that the performance of the camera module does not reach the standard after the camera module is assembled.
In order to solve the technical problem, the invention provides a method for testing the optical image stabilization performance of a camera driving motor, which comprises the following steps:
the shaking table is used for simulating the shaking process of actual hand-held shooting of a person;
the test tool is used for mounting a camera driving motor to be capable of bearing a lens and comprises an X/Y direction displacement monitoring module and an OIS driving module; the camera driving motor is internally provided with an X-direction Hall sensor for detecting the displacement of the lens in the X direction and a Y-direction Hall sensor for detecting the displacement of the lens in the Y direction;
the X/Y direction displacement monitoring module is connected with the upper computer;
the test method comprises the following steps:
step S1, installing a camera driving motor to be tested on a testing tool, and electrically connecting the camera driving motor to the X/Y direction displacement monitoring module and the OIS driving module respectively;
step S2, the OIS driving module is started, so that the camera driving motor and the OIS driving module form an OIS closed-loop control system for driving OIS performance adjustment of a lens in the camera driving motor;
step S3, starting the X/Y direction displacement monitoring module to obtain the initial position data X of the initial posture of the camera driving motor in the X direction and the Y directionTarget(t0) and YTarget(t0), and acquiring initial displacement data X of the lens in the X direction and the Y direction in the camera driving motorHall(t0) andYHall(t0), wherein t0 is the time corresponding to the initial posture of the camera driving motor;
step S4, starting the shaking table to enable the test tool to vibrate according to a preset program;
step S5, acquiring position data of the real-time posture of the camera driving motor in the X direction and the Y direction after projection through the X/Y direction displacement monitoring module: offset X of displacementTarget(t) and displacement offset YTarget(t) and acquiring real-time position data of a lens in the camera driving motor in the X direction and the Y direction: compensating displacement XHall(t) and the compensation displacement amount YHall(t) wherein t is the time corresponding to the real-time attitude of the camera driving motor;
step S6, X-direction data analysis, Y-direction data analysis:
the upper computer is used for aligning the data X acquired by the X/Y direction displacement monitoring moduleTarget(t0)、YTarget(t0)、XHall(t0)、YHall(t0)、XTarget(t)、YTarget(t)、XHall(t) and YHall(t) analyzing the phase and the difference value, and obtaining the compensation rate and the compensation amount which can be provided by the OIS function of the camera driving motor in the X/Y direction; and setting a reasonable threshold value frame line for the compensation rate and the compensation quantity to judge whether the OIS performance of the camera driving motor reaches the standard or not.
Preferably, the method further comprises step S7: and displaying the test result of the OIS performance of the camera driving motor through an upper computer.
Preferably, the OIS driver module includes an OIS driver chip electrically connected to the camera driver motor and a first gyroscope electrically connected to the OIS driver chip;
the OIS driving chip adjusts the magnitude and the direction of the driving current in real time to control the real-time movement of the lens in the camera driving motor in the X/Y direction, wherein the direction of the real-time movement of the lens in the camera driving motor in the X/Y direction driven by the OIS driving chip is opposite to the direction of the movement of the lens in the camera driving motor generated by the shaking table, and the generated displacements are equal.
Preferably, the X/Y direction displacement monitoring module comprises a DSP processing module, and a hall signal preprocessing module and a second gyroscope electrically connected to the DSP processing module, respectively;
the DSP processing module obtains X through the Hall signal preprocessing moduleHall(t) and YHall(t)；
The DSP processing module acquires the real-time angular rate data of the self attitude through the second gyroscope, and performs integration and conversion processing on the angular rate data: the deflection angle generated in the Yaw direction is thetaYaw(t) a displacement offset X projected to the X direction and generated in the X direction by the camera driving motor when the camera driving motor is shakenTarget(t); the deflection angle occurring in the Pitch direction is θPitch(t) a displacement offset Y projected to the Y direction and generated in the Y direction by the camera driving motor when the camera driving motor is shakenTarget(t)。
Preferably, the X-direction Hall sensors are provided with two and arranged on two opposite sides of the lens at intervals, and the Y-direction Hall sensors are provided with two and arranged on the other opposite sides of the lens at intervals.
Compared with the prior art, in the optical image stabilization performance testing method of the camera driving motor, the testing tool is shaken through the shaking table, the camera driving motor to be tested is installed on the testing tool, the camera driving motor and the OIS driving module on the camera driving motor form a motor OIS closed-loop control system for driving the OIS performance adjustment of the lens in the camera driving motor, and the X/Y direction displacement monitoring module obtains the X in real timeHall(t) and XTarget(t)，YHall(t) and YTargetAnd (t) analyzing the phase and the difference of the acquired data by the upper computer, so that the compensation speed and the compensation quantity parameter of the OIS function of the camera driving motor in the X/Y direction can be obtained, and the upper computer can judge whether the performance of the OIS of the camera driving motor reaches the standard or not by setting a reasonable threshold frame line. The method does not needThe OIS performance test is carried out after the camera driving motor is completely assembled into a finished product camera module, the test can be carried out in the camera driving motor feeding stage, the defect that the OIS performance of the camera driving motor in the camera driving motor is unqualified and the defect rate is generated in the camera driving motor is avoided, whether the OIS performance reaches the standard or not can be found in advance, the problem of rework maintenance is avoided, the production efficiency is effectively improved, the production cost is reduced, and the risk that the performance does not reach the standard after the camera module is assembled is effectively controlled.
Drawings
FIG. 1 is a block diagram of the flow of the method for testing the optical image stabilization performance of the camera driving motor according to the present invention;
FIG. 2 is a schematic structural diagram of a testing device of the method for testing the optical image stabilization performance of the camera driving motor according to the present invention;
FIG. 3 is a diagram of X-direction data analysis in the steps of the method for testing optical image stabilization performance of a camera driving motor according to the present invention;
FIG. 4 is a Y-direction data analysis diagram in the steps of the optical image stabilization performance testing method of the camera driving motor according to the present invention;
fig. 5 is an analysis diagram of the compensation rate and compensation amount that the OIS function of the camera driving motor can provide in the X direction in the step of the method for testing optical image stabilization performance of the camera driving motor according to the present invention;
fig. 6 is an analysis diagram of the compensation rate and the compensation amount that the OIS function of the camera driving motor can provide in the Y direction in the step of the method for testing the optical image stabilization performance of the camera driving motor according to the present invention.
Detailed Description
The invention will be further explained with reference to the drawings and the embodiments.
Referring to fig. 1-2, the present invention provides a method for testing optical image stabilization performance of a camera driving motor, which comprises:
the shaking table 1 is used for simulating the shaking process of actual hand-held shooting of a person.
The testing tool 2 is used for installing a camera driving motor 10 capable of bearing a lens 101, and comprises an X/Y direction displacement monitoring module 21 and an OIS driving module 22.
In this embodiment, the camera driving motor 10 is built in to detect the displacement of the internal lens 101 in the X direction and the Y direction and generate hall signals X respectivelyHallI.e., a set of X-direction hall sensors 102a for detecting displacement of the lens 101 in the X direction and a set of Y-direction hall sensors 102b for detecting displacement of the lens 101 in the Y direction.
Preferably, the two hall sensors 102a are arranged at intervals on two opposite sides of the lens 101, and the two hall sensors 102b are arranged at intervals on the other two opposite sides of the lens 101, and are symmetrically arranged to improve the detection accuracy.
And the X/Y direction displacement monitoring module 21 is connected with the upper computer 3.
The X/Y direction displacement monitoring module 21 is used for transmitting the obtained displacement signals of the camera driving motor 10 in the X/Y direction and the obtained displacement signals of the test tool 2 in the X/Y direction to the upper computer 3, and analyzing and comparing the signals through the upper computer 3.
The OIS driver module 22 includes an OIS driver chip 221 electrically connected to the camera driver motor 10 and a first gyroscope 222 electrically connected to the OIS driver chip 221.
The OIS driver chip 221 adjusts the magnitude and direction of the driving current in real time to control the real-time movement of the lens 101 in the camera driving motor 10 in the X/Y direction, wherein the direction of the real-time movement of the lens 101 in the camera driving motor 10 in the X/Y direction, which is driven by the OIS driver chip 221, is opposite to the direction of the movement of the lens 101 in the camera driving motor 10 caused by the shake table 1, and the magnitude is equal to the magnitude.
The X/Y direction displacement monitoring module 21 includes a DSP processing module 211, and a hall signal preprocessing module 212 and a second gyroscope 213 electrically connected to the DSP processing module 211, respectively.
The test method comprises the following steps:
step S1, the camera driving motor 10 to be tested is mounted on the testing tool 2, and is electrically connected to the X/Y direction displacement monitoring module 21 and the OIS driving module 22, respectively.
Step S2, the OIS driver module 22 is turned on, so that the camera driving motor and the OIS driver module 22 form a motor OIS closed-loop control system for driving the OIS performance adjustment of the lens 101 in the camera driving motor 10.
In this step, when the camera driving motor 10 and the OIS driving module 22 form a motor OIS closed-loop control system, it is necessary to ensure that the component model, the relative position of the component, the firmware program version, and the like in the system are completely equal to the camera motor OIS closed-loop control system in the complete camera module product, that is, the OIS performance of the camera driving motor 10 in the motor OIS closed-loop control system can be completely equal to the OIS performance of the camera motor OIS closed-loop control system in the complete camera module product. Different, compared with the prior art that the OIS test is carried out on the complete camera module product, the camera driving motor 10 (namely, the motor unit) in the motor OIS closed-loop control system of the invention is not assembled into a camera module, so that the camera module can be conveniently replaced; by replacing different camera driving motors 10 and researching the OIS performance of the camera driving motor 10 in the motor OIS closed-loop control system, the OIS performance of the camera driving motor 10 can be evaluated, the OIS performance can be obtained before the camera driving motor 10 is assembled into a camera module, and the risk that the test OIS performance does not reach the standard and needs to be disassembled and reworked after the camera driving motor 10 is assembled is effectively controlled.
After the camera driving motor 10 and the OIS driving module 22 form a motor OIS closed-loop control system, OIS performance of the camera driving motor 10 in the motor OIS closed-loop control system is mainly expressed as follows: when the external environment shakes to cause the camera driving motor 10 to displace in the X/Y direction, whether the camera driving motor 10 can rapidly drive the lens 101 to generate equal reverse displacement in the X/Y direction under the action of the motor OIS closed-loop control system is determined, so as to compensate the external shake and achieve the purpose of optical image stabilization.
Ideally, the camera driving motor with good OIS performance has phase delay and displacement deviation approaching zero between the compensation offset in the X/Y direction and the offset in the X/Y direction generated by jitter; in actual circumstances, the phase delay and the displacement deviation become larger as the OIS performance of the camera driving motor is reduced. Therefore, the objective of evaluating the OIS performance of the camera drive motor 10 can be achieved by evaluating the phase delay and the displacement deviation.
Step S3, the X/Y direction displacement monitoring module 21 is turned on to obtain the initial position data X of the initial posture of the camera driving motor 10 in the X direction and the Y directionTarget(t0) and YTarget(t0), and acquiring initial displacement data X of the lens 101 in the X-direction and the Y-direction in the camera driving motor 10Hall(t0) and YHall(t 0). T0 is the time corresponding to the initial posture of the camera driving motor 10.
And step S4, starting the shaking table to enable the test tool to vibrate according to a preset program.
Step S5, acquiring, by the X/Y direction displacement monitoring module 21, post-projection position data of the real-time posture of the camera driving motor 10 in the X direction and the Y direction: offset X of displacementTarget(t) and displacement offset YTarget(t); and acquiring real-time position data of the lens 101 in the camera driving motor 10 in the X direction and the Y direction: compensating displacement XHall(t) and the compensation displacement amount YHall(t) of (d). And t is the time corresponding to the real-time posture of the camera driving motor.
The test fixture 2 is rigidly connected to the camera driving motor 10, so that the test fixture is displaced in the X/Y direction, which represents the displacement offset (X) of the camera driving motor 10 caused by shakingTarget(t)、YTarget(t)) which is in accordance with the amount of compensation displacement (X) caused by the movement of the lens 101Hall(t)、XTarget(t)) the smaller the phase difference and displacement deviation between them, the better the OIS performance.
The X/Y displacement monitoring module 21 mainly monitors signals in two aspects:
on the one hand, real-time monitoring of Hall signals X from X/Y directions in the camera drive motor 10HallThe signal represents the actual position of the lens 101 in the camera drive motor 10 at X/Y, i.e. as represented by XHall(t) and YHall(t)；
In this step, specifically, the DSP processing module 211 of the X/Y direction displacement monitoring module 21 obtains X through the hall signal preprocessing module 212Hall(t) and YHall(t) acquiring a lens X/Y direction displacement signal, that is, real-time position data of the lens 101 in the X direction and the Y direction, expressed as the X directionHall(t) and YHall(t)；
And on the other hand, the attitude angular rate data of the second gyroscope 213 in the X/Y direction displacement monitoring module 21 is monitored in real time.
In this step, specifically, in the X/Y direction displacement monitoring module 21, the DSP processing module 211 obtains the real-time angular rate data of its own posture through the second gyroscope 213, and performs integration and conversion processing on the angular rate data: the deflection angle generated in the Yaw direction is thetaYaw(t) a displacement offset X projected to the X direction representing a displacement in the X direction caused by the camera driving motor 10 itself shaking due to external vibrationTarget(t); the deflection angle occurring in the Pitch direction is θPitch(t) a displacement offset Y projected to the Y direction representing the Y direction displacement of the camera driving motor 10 caused by the self-shake due to the external vibrationTarget(t) of (d). Wherein, the Yaw direction is the direction of rotating around the Y axis, and the Pitch direction is the direction of rotating around the X axis.
Step S6, X-direction data analysis, Y-direction data analysis:
according to the working principle of OIS, when the function of an OIS driving module is started, the OIS driving chip can adjust the magnitude and the direction of driving current in real time, and further control a lens in a camera driving motor to move in the X/Y direction in real time; ideally, the moving direction should be opposite to the direction of the shift generated in the X/Y direction by the shake of the camera driving motor, and the generated displacements are equal, so that the X/Y shift generated by the shake can be compensated, and the objective of OIS is achieved. In practical situations, due to the limitations of the OIS performance of the system, there is a time delay and a displacement error between the target displacement amount in the X/Y direction and the actual compensation displacement amount. Therefore, on the contrary, the time delay and the displacement error can accurately reflect the quality of the OIS performance of the camera driving motor.
According to the above principle, XHall(t) and XTarget(t) between, and YHall(t) and YTargetThe smaller the phase delay and displacement deviation of (t), the better the OIS performance of the camera drive motor 10, and vice versa.
Therefore, in the step, the upper computer is used for processing the data X acquired by the X/Y direction displacement monitoring moduleTarget(t0)、YTarget(t0)、XHall(t0)、YHall(t0)；XTarget(t) and XHall(t)；YTarget(t) and YHall(t) of (d). And setting a reasonable threshold value frame line for the compensation rate and the compensation quantity to judge whether the OIS performance of the camera driving motor reaches the standard or not.
After the camera driving motor 10 is tested by the above-mentioned testing method of the present invention, as shown in fig. 3, the data analysis diagram in the X direction, X, in the step of the optical image stabilization performance testing method of the camera driving motor of the present invention is shownTarget(t) and XHall(t) As can be seen from FIG. 3, X is the direction of the abscissa time axisHall(t) and XTarget(t) there is no significant phase delay, which indicates that the OIS performance of the camera drive motor is good, i.e. the camera drive motor can achieve low delay fast compensation.
As shown in fig. 5, it is an analysis chart of the compensation rate and the compensation amount provided by the OIS function of the camera driving motor in the X direction in the step of the method for testing the optical image stabilization performance of the camera driving motor according to the present invention, as can be seen from fig. 5, X isHall(t) and XTarget(t) the result after the difference is zero at almost every moment, indicating that the OIS performance of the camera drive motor is good, i.e. the camera drive motor is able to achieve equivalent displacement compensation.
Similarly, as shown in fig. 4, the optical image stability of the driving motor of the camera head of the present invention is shownAnalysis of data in the Y-direction, Y, in the test method stepTarget(t) and YHall(t), as can be seen from FIG. 4, Y is the abscissa time axis directionHall(t) and YTarget(t) there is no significant phase delay, which indicates that the OIS performance of the camera drive motor is good, i.e. the camera drive motor can achieve low delay fast compensation.
As shown in fig. 6, it is an analysis chart of the compensation rate and the compensation amount provided by the OIS function of the camera driving motor in the Y direction in the step of the method for testing the optical image stabilization performance of the camera driving motor according to the present invention, as can be seen from fig. 6, Y isHall(t) and YTarget(t) the result after the difference is zero at almost every moment, indicating that the OIS performance of the camera drive motor is good, i.e. the camera drive motor is able to achieve equivalent displacement compensation.
Through comprehensive judgment of the test results in fig. 3-6, it can be known that the OIS performance of the camera driving motor (motor unit) is good, and low-delay rapid compensation and equivalent displacement compensation in the X/Y direction can be ensured.
Preferably, the testing method further includes step S7: and displaying the test result of the OIS performance of the camera driving motor through an upper computer.
Compared with the prior art, in the optical image stabilization performance testing method of the camera driving motor, the testing tool is shaken through the shaking table, the camera driving motor to be tested is installed on the testing tool, the camera driving motor and the OIS driving module on the camera driving motor form a motor OIS closed-loop control system for driving the OIS performance adjustment of the lens in the camera driving motor, and the X/Y direction displacement monitoring module obtains the X in real timeHall(t) and XTarget(t)，YHall(t) and YTargetAnd (t) analyzing the phase and the difference of the acquired data by the upper computer, so that the compensation speed and the compensation quantity parameter of the OIS function of the camera driving motor in the X/Y direction can be obtained, and the upper computer can judge whether the performance of the OIS of the camera driving motor reaches the standard or not by setting a reasonable threshold frame line. The method does not require the complete assembly of the camera drive motorOIS performance test is carried out after the camera module, and the camera driving motor can be tested in the material feeding stage, so that the defect rate of the camera driving motor OIS in the camera module testing and finding the assembled finished product caused by unqualified performance of the camera driving motor OIS is avoided, and whether the OIS performance reaches the standard or not can be found in advance, thereby avoiding the problem of rework maintenance, effectively increasing the production efficiency, reducing the production cost, and effectively controlling the risk that the performance of the camera module does not reach the standard after being assembled.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (5)

1. The method for testing the optical image stabilization performance of the camera driving motor is characterized by comprising the following steps of:
the shaking table is used for simulating the shaking process of actual hand-held shooting of a person;
the testing tool is used for installing a camera driving motor capable of bearing a lens and comprises an X/Y direction displacement monitoring module and an OIS driving module; the camera driving motor is internally provided with an X-direction Hall sensor for detecting the displacement of the lens in the X direction and a Y-direction Hall sensor for detecting the displacement of the lens in the Y direction;
the X/Y direction displacement monitoring module is connected with the upper computer;
the test method comprises the following steps:
step S1, installing a camera driving motor to be tested on a testing tool, and electrically connecting the camera driving motor to the X/Y direction displacement monitoring module and the OIS driving module respectively;
step S2, the OIS driving module is started, so that the camera driving motor and the OIS driving module form an OIS closed-loop control system for driving OIS performance adjustment of a lens in the camera driving motor;
step S3, starting the X/Y direction displacementA monitoring module for acquiring initial position data X of the initial posture of the camera driving motor in X direction and Y directionTarget(t0) and YTarget(t0), and acquiring initial displacement data X of the lens in the X direction and the Y direction in the camera driving motorHall(t0) and YHall(t0), wherein t0 is the time corresponding to the initial posture of the camera driving motor;
step S4, starting the shaking table to enable the test tool to vibrate according to a preset program;
step S5, acquiring position data of the real-time posture of the camera driving motor in the X direction and the Y direction after projection through the X/Y direction displacement monitoring module: offset X of displacementTarget(t) and displacement offset YTarget(t) and acquiring real-time position data of a lens in the camera driving motor in the X direction and the Y direction: compensating displacement XHall(t) and the compensation displacement amount YHall(t), wherein t is the time corresponding to the real-time posture of the camera driving motor;
step S6, X-direction data analysis, Y-direction data analysis:
the upper computer is used for aligning the data X acquired by the X/Y direction displacement monitoring moduleTarget(t0)、YTarget(t0)、XHall(t0)、YHall(t0)、XTarget(t)、YTarget(t)、XHall(t) and YHall(t) analyzing the phase and the difference value, and obtaining the compensation rate and the compensation amount which can be provided by the OIS function of the camera driving motor in the X/Y direction; and setting a reasonable threshold value frame line for the compensation rate and the compensation quantity to judge whether the OIS performance of the camera driving motor reaches the standard or not.
2. The method for testing the optical image stabilization performance of the camera driving motor according to claim 1, further comprising the step S7: and displaying the test result of the OIS performance of the camera driving motor through an upper computer.
3. The method for testing the optical image stabilization performance of the camera driving motor according to claim 1, wherein the OIS driving module comprises an OIS driving chip electrically connected to the camera driving motor and a first gyroscope electrically connected to the OIS driving chip;
the OIS driving chip adjusts the magnitude and the direction of the driving current in real time to control the real-time movement of the lens in the camera driving motor in the X/Y direction, wherein the direction of the real-time movement of the lens in the camera driving motor in the X/Y direction driven by the OIS driving chip is opposite to the direction of the movement of the lens in the camera driving motor generated by the shaking table, and the generated displacements are equal.
4. The method for testing the optical image stabilization performance of the camera driving motor according to claim 3, wherein the X/Y direction displacement monitoring module comprises a DSP processing module, and a Hall signal preprocessing module and a second gyroscope which are respectively and electrically connected with the DSP processing module;
the DSP processing module obtains X through the Hall signal preprocessing moduleHall(t) and YHall(t)；
The DSP processing module acquires the real-time angular rate data of the self attitude through the second gyroscope, and performs integration and conversion processing on the angular rate data: the deflection angle generated in the Yaw direction is thetaYaw(t) a displacement offset X projected to the X direction and generated in the X direction by the camera driving motor when the camera driving motor is shakenTarget(t); the deflection angle occurring in the Pitch direction is θPitch(t) a displacement offset Y projected to the Y direction and generated in the Y direction by the camera driving motor when the camera driving motor is shakenTarget(t); wherein, the Yaw direction is the direction of rotating around the Y axis, and the Pitch direction is the direction of rotating around the X axis.
5. The method for testing the optical image stabilization performance of the camera driving motor according to claim 3, wherein two X-direction Hall sensors are arranged at intervals on two opposite sides of the lens, and two Y-direction Hall sensors are arranged at intervals on the other opposite sides of the lens.
CN202011037048.1A 2020-09-28 2020-09-28 Optical image stabilization performance test method for camera driving motor Active CN111879499B (en)

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Application Number Priority Date Filing Date Title
CN202011037048.1A CN111879499B (en) 2020-09-28 2020-09-28 Optical image stabilization performance test method for camera driving motor
PCT/CN2020/131932 WO2022062163A1 (en) 2020-09-28 2020-11-26 Method for testing optical image stabilization performance of camera driving motor

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