Reshaping signal control method of camera voice coil motor actuator

A voice coil motor and signal shaping technology, applied in cameras, instruments, installations, etc., can solve problems such as long focusing time, reduce sensitivity, reduce chip complexity and cost, and reduce production.

Inactive Publication Date: 2013-10-09
GIANTEC SEMICON LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually the resolution of the voice coil motor driver system is 1 μm ~ 2 μm, which shows that the application of this method system still needs a long focusing time

Method used

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  • Reshaping signal control method of camera voice coil motor actuator
  • Reshaping signal control method of camera voice coil motor actuator
  • Reshaping signal control method of camera voice coil motor actuator

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Embodiment Construction

[0107] based on the following Figure 4 ~ Figure 10 , specifically explain the preferred embodiment of the present invention.

[0108] The present invention provides a shaping signal control method of a camera voice coil motor actuator, comprising the following steps:

[0109] Step 1. The transfer function of the second-order underdamped system is as follows:

[0110] G ( s ) = ω n 2 s 2 + 2 ζ ω n s + ω n 2 - - - ( 1 ) ;

[0111] Among them, ω n is the natural circular frequency of the system,...

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Abstract

Provided is a reshaping signal control method of a camera voice coil motor actuator. According to the reshaping signal control method of the camera voice coil motor actuator, high-level reshaping signals can be generated, and underdamping vibration in pushing of the actuator can be eliminated or greatly reduced, so that the purpose of fast, accurate and automatic focus is achieved, the sensitivity of a chip control system to natural frequency and a damping coefficient is lowered greatly, the complexity and the cost of a chip are reduced, and the cost of producing, manufacturing and testing a camera voice coil motor module is reduced.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a control method for shaping signals of a camera voice coil motor actuator applied in a second-order underdamped system control chip. Background technique [0002] Voice coil motors (VoiceCoilMotor) are widely used in electronic products. In recent years, it has been widely used in the camera lens drive of smartphones and tablet computers. The voice coil motor driver (LensDriver) chip receives external signals (usually provided by the image processing chip in the main chip in the mobile phone) and provides a corresponding linear output current to control the position of the camera lens through the voice coil motor actuator (VoiceCoilActuator), so as to achieve automatic focus (AutoFocus) effect. A voice coil motor actuator can be described as a second-order underdamped system, where the damping coefficient of the system decreases as the volume of the voice coil motor decrease...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B7/09G03B13/36
Inventor 张洪杨清徐红如张成
Owner GIANTEC SEMICON LTD
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