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Lever-arm displacement-increasing device

a technology of displacement and lever, which is applied in the direction of device details, generator/motor, device components, etc., can solve the problems of increasing the input power, increasing the size of the actuator itself, and complicated structure, and achieve the effect of increasing the displacemen

Inactive Publication Date: 2005-04-21
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] In view of the increase in size of the housing and problems in motion of the housing caused by increasing the degree of freedom of the fulcrum, an object of the present invention is to provide a lever-arm displacement-increasing device in which the displacing direction of an output displacing portion is orthogonal to the displacing direction of an actuator element, the output displacing portion outputs a displacement larger than the displacement of the actuator element, and the position of the fulcrum can be freely determined.

Problems solved by technology

This increases input power, and also increases the size of the actuator itself.
Therefore, the structure is complicated, and the cost is increased.
That is, it is impossible to freely move the fulcrum of the lever.
As a result, the displacement-increasing mechanism cannot have a linear shape, but must be shaped like a box.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0033]FIGS. 1A and 1B are a front view and a perspective view, respectively, of a lever-arm displacement-increasing device according to the present invention.

[0034] In the first embodiment, a lever-arm displacement-increasing device 1 includes an actuator-holding space 14 for storing an actuator element 3 that displaces along a center axis 2 of the device. The actuator element 3 is, for example, a piezoelectric, electrostrictive, or magnetostrictive element.

[0035] The lever-arm displacement-increasing device 1 also includes a pair of first and second upper lever arms 5 and 6 and a pair of first and second lower lever arms 7 and 8.

[0036] The actuator element 3 is stored in the actuator-holding space 14, and a rear end thereof is fixed to a fixed portion 4. It is preferable that the fixed portion 4 have as high a strength as possible, and have a thickness more than or equal to double the thickness of the lever arms 5, 6, 7, and 8.

[0037] A front end of the actuator element 3 is join...

second embodiment

[0053] In the second embodiment, a displacement and a force produced from an actuator element 3 along a center axis 2 are transmitted to a connecting portion 9 made of a rigid material, and are then transmitted to a junction 10 through a first upper lever arm 5 joined to the connecting portion 9.

[0054] In this case, the displacement and force of the actuator element 3 are turned 90 degrees through the junction 10 between the first upper lever arm 5 and a second upper lever arm 6, and are directed in an upward direction 12, and the degree of displacement is increased. That is, the junction 10 functions as a displacing portion, and increases the displacement.

third embodiment

[0055] In a lever-arm displacement-increasing device 21 shown in FIG. 4, a second upper lever arm 17 and a second lower lever arm 18 protrude from the side of a connecting portion 9 toward junctions 10 and 11. In this structure, action points shift from the junctions 10 and 11 to displacing portions 19 and 20 at the front ends of the second upper lever arm 17 and the second lower lever arm 18. Therefore, a small displacement can be converted into a large displacement.

[0056] While the displacing portions 19 and 20 are formed by protruding the second upper and lower lever arms 17 and 18 in the above third embodiment, they may be formed by protruding first upper and lower lever arms 5 and 7.

[0057] In order to ensure a high displacement increasing ratio (output displacement / displacement of the actuator element), it is important to arrange the first and second upper lever arms 5 and 17 parallel to each other with a gap smaller than the thickness of the lever arms therebetween, and to s...

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PUM

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Abstract

In a lever-arm displacement-increasing device, two lever arms are joined at one end. The other end of one of the lever arms is connected to a fixed portion that supports the rear end of an actuator element, and the other end of the other lever arm is connected to a rigid connecting portion connected to the front end of the actuator element. The displacement force of the actuator element is transmitted to the lever arms through the connecting portion, and is further transmitted to a joint between the lever arms. The joint functions as an output displacing portion. The joint changes the displacing direction of the actuator element to a direction orthogonal thereto, and produces a displacement larger than the displacement of the actuator element.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a lever-arm displacement-increasing device for use, for example, in a precise positioning device and a sound-generating actuator in the fields of cars, airplanes, high-precision machining, precise measuring apparatuses, and electronic apparatuses. [0003] 2. Description of the Related Art [0004] There is a demand for high-power and compact actuators that produce sound, vibration, or displacement. As a displacement-producing element that satisfies this demand, a magnetostrictive actuator has attracted interest which uses a magnetic material having magnetostrictivity and a rigidity higher than that of a piezoelectric material such as PZT, that is, which uses a magnetostrictive material. [0005] In the magnetostrictive actuator, the magnetostrictive material must be greatly displaced in order to produce great acoustic waves or oscillatory waves. However, in order to greatly displace the m...

Claims

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Application Information

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IPC IPC(8): H02N2/00F16H21/44H01L41/00H01L41/09H01L41/12H04R15/00
CPCH02N2/043F16H21/44H02N2/00
Inventor OHASHI, YOSHIOURYU, MASARU
Owner SONY CORP