Actuator

A driver and driven technology, applied in the direction of instruments, generators/motors, piezoelectric effect/electrostrictive or magnetostrictive motors, etc., can solve the problem of increasing the number of drivers and achieve the effect of reducing the number

Inactive Publication Date: 2007-02-14
FUJI PHOTO OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the driver of Patent Document 1 requires one driving member and one driven member for one moving lens, and in a lens device having a plurality of moving lenses, there is a problem that the number of drivers increases corresponding to the number of moving lenses.
Therefore, there is a problem of upsizing in a lens device having a plurality of moving lenses

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0026] Hereinafter, preferred embodiments of the actuator of the present invention will be described in detail with reference to the drawings.

[0027] figure 1 It is a perspective view showing a lens device 10 to which an actuator of the present invention is applied, figure 2 It is a perspective view showing its internal structure.

[0028] Such as figure 1 As shown, the lens device 10 has a body 12 formed in a substantially rectangular shape, and the inside of the body 12 is equipped with figure 2 Zoom lens (sets) 14, 16 are shown. One of the zoom lenses (groups) 14 and 16 is a zoom lens, and the other is a correction lens. Further, the zoom lenses (groups) 14 , 16 are held by holding frames 18 , 20 , respectively, and the holding frames 18 , 20 are slidably supported in the direction of the optical axis P by two guide shafts 22 , 24 . The two guide shafts 22 and 24 are arranged at diagonal positions inside the main body 12 and parallel to the optical axis P, and are ...

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PUM

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Abstract

The invention provides a miniature actuator in which a plurality of driven members can be driven with common drive friction member and electromechanical conversion element. The actuator 34 comprises a piezoelectric element 42, a drive shaft 44 fixed to the displacement surface 42A of the piezoelectric element 42, coupling pieces 46 and 47 friction-engaged with the drive shaft 44, and presser springs 56 and 57 for biasing the coupling pieces 46 and 47 individually. The presser springs 56 and 57 are composed of a shape memory alloy and when they are heated by means of heaters 66 and 67, the presser springs 56 and 57 deform to regulate the biasing force individually.

Description

technical field [0001] The present invention relates to a driver, and more particularly to a driver mounted on a small precision device such as a digital camera or a mobile phone to drive a zoom lens. Background technique [0002] As a driving device for a lens unit of a digital camera or the like, there is a driver using a piezoelectric element. For example, in the actuator of Patent Document 1, the drive shaft is fixed to one side of the piezoelectric element, and the other side of the piezoelectric element is fixed to the device body. A lens barrel is slidably supported on the drive shaft, and the lens barrel is friction-fitted to the drive shaft by biasing force of a leaf spring. A driving pulse having a substantially sawtooth waveform is applied to the piezoelectric element, and the piezoelectric element deforms at different speeds in the direction of expansion and the direction of contraction. For example, if the piezoelectric element deforms slowly, the lens barrel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/00G02B7/04
CPCG02B7/102H02N2/025
Inventor 佐佐木龙太
Owner FUJI PHOTO OPTICAL CO LTD
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