Drive regulation structure of piezoelectric actuator and lens drive equipped with the same

A technology of piezoelectric actuator and structure, which is applied in the focus device of camera, focus device of projector, piezoelectric device/electrostrictive device, etc., and can solve the problems of damage and pull-out of abutting parts

Inactive Publication Date: 2009-07-22
ALPS ALPINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a problem that the contact member is damaged, or the rotating shaft bites into the contact member and cannot be pulled out from the stopped state.

Method used

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  • Drive regulation structure of piezoelectric actuator and lens drive equipped with the same
  • Drive regulation structure of piezoelectric actuator and lens drive equipped with the same
  • Drive regulation structure of piezoelectric actuator and lens drive equipped with the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0028] figure 1 It is an exploded perspective view of a lens driving device to which a driving restriction structure of a piezoelectric actuator according to an embodiment of the present invention is applied; figure 2 is assembled figure 1 A perspective view of the appearance of the case of the lens driving device shown.

[0029] Such as figure 1 As shown, the lens driving device 1 of this embodiment includes: a substrate 3 on which an image sensor 2 is mounted; a base 5 on which an IR cut filter 4 is mounted; a housing on which a lens holder 6 and a motor 7 as a piezoelectric actuator are mounted. 8; the shielding case 9 for housing the housing 8 .

[0030] Substrate 3 in from figure 1 The shown upper side is assumed to be a square when viewed from the upper side. Image sensor 2 is running from figure 1 The shown upper side is viewed as a rectangle,...

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PUM

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Abstract

The invention provides a drive regulation structure of a piezoelectric actuator for efficiently regulating parallel translation of the rotating shaft of the piezoelectric actuator without causing any damage on the peripheral member or abrasion thereof. The drive regulation structure of a piezoelectric actuator for rotating the rotating shaft by controlling application of a voltage to a piezoelectric element and translating the rotating shaft to the axial direction is characterized by comprising a stopper (7c) projecting in the direction intersecting the axial direction of a rotating shaft (7b) perpendicularly and rotating integrally with the rotating shaft (7b), and regulation pieces (16a, 16b) abutting against the stopper (7c) when the rotating shaft (7b) translates up to a predetermined position and regulating rotation of the rotating shaft (7b).

Description

technical field [0001] The present invention relates to a drive limiting structure of a piezoelectric actuator and a lens driving device having the structure, and more particularly to a piezoelectric actuator that rotates a rotating shaft by controlling the voltage applied to the piezoelectric element and moves parallel to the axial direction. A drive limiting structure of an actuator and a lens driving device having the structure. Background technique [0002] Currently, piezoelectric actuators are widely used in the precision control of semiconductor manufacturing and industrial equipment. In recent years, applications to digital cameras and camera mobile phones have rapidly expanded, and they are used in various fields such as hand-shake correction functions of digital cameras and drive control of lenses for autofocus, for example. [0003] As such a piezoelectric actuator, there is provided a piezoelectric actuator including a rotating shaft having threaded threads form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/00H01L41/09
CPCG02B7/102H02N2/043H02N2/0095G02B7/04G03B13/34G03B3/10G03B2205/0061
Inventor 石黑克之龟山泰明
Owner ALPS ALPINE CO LTD
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