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Method for driving piezoelectric actuator, piezoelectric-actuator control circuit, and image-stabilization control circuit

一种执行元件、控制电路的技术，应用在电气元件、压电效应/电致伸缩或磁致伸缩的电动机、发电机/电动机等方向，能够解决控制复杂等问题，达到抑制异常噪声、控制简单、简单结构的效果

Inactive Publication Date: 2010-10-27
SANYO ELECTRIC CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] There is a possibility that the generation of abnormal noise at the time of such movement and stop can be reduced by gradually changing the driving speed at the time of driving start or stop
However, in order to gradually change the driving speed, it is necessary to gradually change the pulse width of the driving pulse signal or the applied voltage, which may complicate the control.

Method used

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  • Method for driving piezoelectric actuator, piezoelectric-actuator control circuit, and image-stabilization control circuit
  • Method for driving piezoelectric actuator, piezoelectric-actuator control circuit, and image-stabilization control circuit
  • Method for driving piezoelectric actuator, piezoelectric-actuator control circuit, and image-stabilization control circuit

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Embodiment Construction

[0015] Hereinafter, embodiments of the present invention (hereinafter referred to as "embodiments") will be described based on the drawings. In the present embodiment, the present invention is applied to a camera in which a piezoelectric actuator is used as a hand-shake correction mechanism.

[0016] figure 1 It is a schematic block diagram of the camera shake correction system using piezoelectric actuators in this camera. This camera shake correction system is configured to include a sensor unit 2 , a circuit unit 4 , and a drive unit 6 . The circuit unit 4 is an anti-vibration control circuit that performs camera shake correction control. There are several methods for the hand-shake correction system. For example, this system adopts a method of controlling the position of the lens 8 that forms an optical image on the light-receiving surface of an imaging element (not shown).

[0017] The sensor unit 2 is composed of a Hall element 10 and a gyro sensor 12 . The Hall elemen...

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Abstract

Abnormal noise generated while driving a piezoelectric actuator is prevented. A pulse-generation circuit is capable of selectively generating a displacement pulse and a stationary pulse as a drive pulse for application to a piezoelectric element, the displacement pulse having a duty ratio for causing a lens to be displaced by a predetermined step width, and the stationary pulse having a duty ratio for causing the lens to remain stationary in a current position. The pulse-generation circuit controls the production of the drive pulse continuously for a plurality of times within the servo control cycle, causes the displacement pulse to be produced when the remainder of a required amount of displacement is equal to or greater than a threshold value, and causes the stationary pulse to be continuously produced until the initiation of the next servo control cycle when the remainder is less than the threshold value.

Description

technical field [0001] The present invention relates to a driving method and a control circuit for generating a driving pulse corresponding to an impact-driven actuator using a piezoelectric element, and an anti-vibration control circuit for correcting camera shake in an imaging device. Background technique [0002] Piezoelectric actuators utilizing the electrostrictive effect of piezoelectric elements have been proposed, and have attracted attention as ultra-small actuators (see Non-Patent Document 1). Such piezoelectric actuators are used, for example, in camera shake correction, automatic focus adjustment, and the like. [0003] The impact-driven piezoelectric actuator has a drive shaft that frictionally holds a moving object and expands and contracts with a piezoelectric element (piezoelectric element). The drive circuit generates a voltage signal that is different from the speed of the drive shaft when it is stretched and contracted, that is, slowly stretches and fast ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N6/00G03B5/00
CPCH02N2/062G03B5/00
Inventor 所哲也重冈幸彦伊藤久男吉田秀夫永光毅造
Owner SANYO ELECTRIC CO LTD
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