Title:
IMPACT SENSOR
Document Type and Number:
WIPO Patent Application WO/1991/005266
Kind Code:
A1
Abstract:
This invention relates to an impact sensor which does not have any electric contacts exposed to the open air and any moving portions but has high durability and high reliability and can reliably detect collision of a car for a long period even when mounted on a car. The impact sensor comprises a piezoelectric element (3, 13) which, when compressed, generate a voltage corresponding to the compressive force, a pair of electrodes (1c, 1d, 11c, 14) sandwiching the piezoelectric element, an inertia member (6, 16) for applying the compressive force to one of the electrodes and a biasing member (7, 17) for biasing the inertia member (6, 16) towards the piezoelectric element (3, 13). When an impact force is applied to the inertia member (6, 16), the inertia member (6, 16) compresses the piezoelectric element (3, 13) with the compressive force corresponding to this impact force and the piezoelectric element (3, 13) generates the voltage corresponding to the compressive force.
Inventors:
SUZUKI OTOHIKO (JP)
KANEKO KOUICHI (JP)
FUJIYAMA YOUICHI (JP)
KANEKO KOUICHI (JP)
FUJIYAMA YOUICHI (JP)
Application Number:
PCT/JP1990/001281
Publication Date:
April 18, 1991
Filing Date:
October 04, 1990
Export Citation:
Assignee:
TAKATA CORP (JP)
International Classes:
G01P15/00; G01P15/09; G01P21/00; H01H35/14; (IPC1-7): G01P15/00; G01P15/02; G01P15/09
Foreign References:
| JPS5014541Y1 | 1975-05-07 | |||
| JPS53151442U | 1978-11-29 | |||
| JPS6228523Y2 | 1987-07-22 |
Other References:
See also references of EP 0447560A4
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