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Title:
ACCELEROMETER
Document Type and Number:
WIPO Patent Application WO2004109299
Kind Code:
A3
Abstract:
An accelerometer is limited to a very small displacement range, and within that range, is useful for detecting motion and change of rate of motion by optical, magnetic, or electrical means. A unique spring comprising elongate beams extending around the circumference of the movable mass suspends a planar mass that is very sensitive to motion of an object in which the accelerometer is held. In one embodiment, an optical detector detects the motion of the mass by the intensity of reflected radiation. In another embodiment, a Hall-effect sensor detects the motion of the mass by a current generated by the motion of the mass in an electric field. The accelerometer may be used in a variety of automotive, appliance, and industrial applications. For better resistance against fatigue, the width of the supporting beams linearly decreases from the end connected to the mass towards the outer frame member.

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Inventors:
JOSEPH PETER D (US)
LINSKE ERIK W (US)
ALBRECHT KENNETH A (US)
Application Number:
PCT/US2004/016598
Publication Date:
March 10, 2005
Filing Date:
May 25, 2004
Export Citation:
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Assignee:
CHERRY CORP (US)
JOSEPH PETER D (US)
LINSKE ERIK W (US)
ALBRECHT KENNETH A (US)
International Classes:
G01P15/08; G01P15/093; (IPC1-7): G01P15/08
Foreign References:
DE4431232A11996-03-14
EP1031837A12000-08-30
EP0395922A11990-11-07
US5824901A1998-10-20
US4849655A1989-07-18
EP0431807A11991-06-12
US3961185A1976-06-01
Other References:
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 06 4 June 2002 (2002-06-04)
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