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Image modulation transfer function (MTF) evaluation-based module motor curve testing method

A test method and motor technology, applied in the direction of engine test, machine/structural component test, measurement device, etc., can solve problems such as abnormal motor and assembly tilt, and achieve the effect of ensuring quality

Active Publication Date: 2013-06-12
NINGBO SUNNY OPOTECH CO LTD
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Problems solved by technology

[0002] At present, with the wide application of AF (auto-focus) mobile phone cameras, assembly tilt and abnormal motor problems often occur due to reasons such as manufacturing process and motor incoming materials.

Method used

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  • Image modulation transfer function (MTF) evaluation-based module motor curve testing method
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  • Image modulation transfer function (MTF) evaluation-based module motor curve testing method

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Embodiment Construction

[0022] The problem to be solved by the present invention is to detect abnormal products of AF mobile phone module motors, and to provide a technical scheme of motor curve testing based on image MTF evaluation. The basis is that for a fixed object distance, changing the defocus of the lens can change the definition of the module image. By selecting an appropriate definition calculation function, it can replace the laser distance measurement and be used to test the consistency of the motor characteristics, such as the starting current. , stop current, linearity, hysteresis, etc. In this scheme, the MTF evaluation using the image definition calculation function replaces the traditional laser test. The MTF of the image is used because this function has good anti-interference and can accurately reflect the defocusing situation of the lens, so that it can be better Evaluate motor curve characteristics.

[0023] The operation of the motor is mainly displacement. The change of displa...

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Abstract

The invention provides an image modulation transfer function (MTF) evaluation-based module motor curve testing method. An MTF capable of reflecting a defocusing change condition of a lens and testing the consistency of motor characteristics is used as a definition calculation function, MTFs of different positions of a motor are analyzed according to a motor curve fitted by the MTFs, the kinetic characteristics of the motor are judged, and when the motor curve is tested, the positions of the highest points of the motor curve in four corners of a displayed image are simultaneously found, the positions of the four corners are calculated to obtain focal length differences of the four corners, a tilting height difference of the lens and the surface of a sensor is judged, and a tilting angle is calculated. According to the motor curve testing scheme applied by the invention, an MTF testing target and image detection equipment are used for effectively detecting the motor characteristics of a module and bad conditions of tilting of the motor, so that the quality of the product is ensured.

Description

technical field [0001] The invention relates to a motor curve testing method of a camera module of a mobile phone, in particular to a technical method for testing a motor curve of an AF mobile phone camera module based on image MTF evaluation. Background technique [0002] At present, with the wide application of AF (autofocus) mobile phone cameras, assembly tilt and abnormal motor problems often occur due to reasons such as manufacturing process and motor incoming materials. How to detect this defective product will be the key to ensure product quality. The traditional method is to use laser ranging to test the motor curve and the dynamic tilt of the motor. The dynamic tilt of the motor cannot fully reflect the tilt between the lens and the sensor. Therefore, it will be particularly important to study a method that can accurately detect the tilt between the lens and the sensor and at the same time be able to test the motor curve. Contents of the invention [0003] The p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B43/00G01M15/00G01B21/22
Inventor 丁亮张宝忠张扣文王刚
Owner NINGBO SUNNY OPOTECH CO LTD
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