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Voice coil motor control method and lens focusing system

A technology of voice coil motor and control method, which is applied in the direction of control system, AC motor control, electrical components, etc., can solve the problem of short adjustment time, achieve the effect of short control time and eliminate resonance

Active Publication Date: 2015-03-25
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this solution can effectively eliminate the vibration of the voice coil motor, the shortest adjustment time is half the resonance cycle

Method used

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  • Voice coil motor control method and lens focusing system
  • Voice coil motor control method and lens focusing system
  • Voice coil motor control method and lens focusing system

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Embodiment Construction

[0023] Several preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the present invention. In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0024] refer to figure 2 Shown is a current schematic diagram of the voice coil motor control method according to the present invention; the voice coil motor control method shown is applied to the lens focusing system, for example, it can be applied to the mobile phone lens focusing system, and the structure of the voice coil motor is as...

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Abstract

The invention discloses a voice coil motor control method and a lens focusing system. Coil current of a voice coil motor is controlled to enable current of a coil moving from a middle displacement position to a target position and current of the coil moving from an initial position to the middle displacement position to be centrally symmetric relative to middle points (I1 / 2 and t1 / 2), and accordingly the speed of the coil of the voice coil motor can be zero when the coil reaches the target position. By means of the voice coil motor control method, the resonance oscillation of the voice coil motor can be effectively eliminated, and control time is short.

Description

technical field [0001] The invention relates to the field of voice coil motor control, and more specifically relates to a voice coil motor control method and a lens focusing system. Background technique [0002] Voice coil motors are widely used in mobile phone camera focusing systems due to their small size and fast response. Refer to figure 1 Shown is a voice coil motor focusing schematic diagram, the voice coil motor 11 includes a spring 15, an electromagnet 12 and a magnet 17, the coil 16 current I in the voice coil motor 11 M The magnetic force generated by the coil of the electromagnet 12 interacts with the magnet 17, thereby moving the electromagnet 12. Therefore, the voice coil motor control circuit 13 controls and adjusts the coil current I in the voice coil motor 11 M , by adjusting the magnitude of the current to control the position of the prism lens 14, so as to realize the focusing of the mobile phone. [0003] However, due to the resonance of the spring in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/02G02B7/04G03B30/00
Inventor 蔡勇斌
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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