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Driving mechanism

A driving device and driver technology, applied in the direction of installation, generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, etc., can solve the problems of large displacement, unreliable driven parts, movement, etc.

Active Publication Date: 2009-01-28
FUJI PHOTO OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in the actuator of Patent Document 3, since the drive shaft is attached to one side of the piezoelectric element, and the other side is in a free state, when a high-frequency voltage is applied to the piezoelectric element to expand and contract, the other side of the free state Displacement is large on one side, and the drive shaft side hardly displaces, causing the problem that the thrust of the driven part cannot be obtained sufficiently
Therefore, it is necessary to install a hammer member on the other side of the piezoelectric element, but in this case, as described above, since resonance occurs between the piezoelectric element, the hammer member, and the drive shaft, the driven shaft cannot be reliably driven. Problems with moving parts

Method used

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no. 1 Embodiment approach

[0062] First, a drive device according to a first embodiment of the present invention will be described.

[0063] figure 1 It is a schematic diagram showing the configuration of the driving device according to the first embodiment. The driving device shown in the same figure includes a driver 10 and a support member 22 that supports the driver 10 on a fixed frame 24 .

[0064] The actuator 10 includes a piezoelectric element (corresponding to an electromechanical conversion element) 12 , a drive shaft (corresponding to a driving friction member) 14 , and a weight member 18 . The piezoelectric elements 12 are formed by being laminated in the arrow direction, and are deformed (expandable) in the lamination direction by applying a voltage. Therefore, the piezoelectric element 12 has a structure in which the end surfaces 12A and 12B in the longitudinal direction are displaced.

[0065] The proximal end of the drive shaft 14 is fixed to one end surface 12A of the end surfaces 1...

no. 2 Embodiment approach

[0102] then based on Figure 7 The driving device related to the present invention will be described.

[0103] Such as Figure 7 As shown, in the second embodiment, the actuator 10 is supported by a pair of support plates 40 and 42 in a state of being pressed from both sides in the expansion and contraction direction of the piezoelectric element 12 . The support plate 40 is formed into a U-shape by a thin metal plate, and is attached to the fixed frame 24 in a state in which the weight member 18 is pushed. The support plate 42 is made of a thin metal plate, and is fixed to the fixed frame 24 by an adhesive 44 in a state of pressing the front end surface of the drive shaft 14 .

[0104] According to the second embodiment configured as described above, the actuator 10 is sandwiched between the pair of support plates 40 and 42 in the expansion and contraction direction of the piezoelectric element 12, and is supported in a nearly floating state. Since the driver 10 supported in ...

no. 3 Embodiment approach

[0106]then based on Figure 8 A drive device according to a third embodiment of the present invention will be described.

[0107] Such as Figure 8 As shown, the actuator 10 of the third embodiment is supported by a pair of support members 50 , 50 in a state where the side surfaces of the piezoelectric element 12 are pressed from both sides. The support members 50 , 50 are made of metal, resin, or rubber, and are attached to the fixed frame 24 . In addition, the top ends of the support members 50, 50 and the side surfaces of the piezoelectric element 12 may be bonded together with an elastic adhesive. In addition, instead of the pair of support members 50 , 50 , a cylindrical support member may be used to push the entire piezoelectric element and support the side surfaces of the piezoelectric element 12 .

[0108] According to the third embodiment configured as above, since the actuator 10 is supported by pressing the side surfaces of the piezoelectric element 12 from both ...

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Abstract

A driving mechanism and producing method thereof is provided, wherein the driving mechanism enables move the moving object with high precision via support part which made of resin material to support piezoelectric elements. A driving shaft (14) is set on the piezoelectric element (12), a drived part (16) is set movably along with axial direction of the driving shaft (14), filling and harding resin material between the piezoelectric element (12) and a stationary part (10) to arrange support part (5) to support the piezoelectric element (12). Thereby through filling and harding resin material after set the piezoelectric element (12) and the driving shaft (14) at the prescribed position, the piezoelectric element (12) and the driving shaft (14) is set at the accurate position, the drived part (16) and the moving lens (70) arranged on thereof is moved with high precision.

Description

technical field [0001] The present invention relates to a drive device using a driver, and more particularly to a drive device for driving optical components such as relatively small lenses mounted in a compact digital camera, a network camera, or a mobile phone with a camera. Background technique [0002] A driver using a piezoelectric element is known as a driving device for a lens such as a digital camera. For example, the actuator of Patent Document 1 is composed of a piezoelectric element, a driving member, and a base. A driving member is fixed to one end surface of the piezoelectric element in a stretching direction, and a driven member is friction-fitted to the driving member. In addition, a base is fixed to the other end surface of the piezoelectric element in the expansion and contraction direction. When a pulsed voltage is applied to the piezoelectric element with such a configuration, vibrations in the expansion direction and the contraction direction of the pie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/04H02N2/00
Inventor 真锅充雄佐佐木龙太一宫武史江黑亨德宫元贵
Owner FUJI PHOTO OPTICAL CO LTD