NORMALLY CLOSED COMPACT VIBRATION SENSOR

Japanese Patent JP3823292

B2

PROBLEM TO BE SOLVED: To provide an omnidirectional normally closed compact vibration sensor which facilitates installation of electrode members constituting the major portion of assembly work, has a simple structure, robustness, capability of downsizing the whole, increases manufacturability, lowers a price, durability and abrasion resistance, and has high degree of reliability.
SOLUTION: A pair of electrode members A1, A2 forming an opening 2A having a nearly semi-ellipsoidal surface having an opening at the front end face are adhered to a molded insulator B so that a gap 4 having a predetermined width is formed between the electrode members A1 and A2. The openings of the electrode members facing each other form a cavity 2 having a nearly ellipsoidal inner surface, in which two electrically conductive spherical bodies C are accommodated in a rollable manner. In a stationary state, regardless of their attitudes, two spherical bodies make contact with the electrode members, while the spherical bodies always make contact with each other, providing electric conduction between the two electrode members. When vibration is applied, regardless of its vibration direction, electrical conduction and nonconduction are repeated, when the spherical bodies move.

Kiyotsugu Arai

JP2001360605A

September 20, 2006

November 27, 2001

Click for automatic bibliography generation  

Nittei Radio Co., Ltd.
Star Trading Co., Ltd.

G01H1/00; G01P15/135; H01H35/14; (IPC1-7): G01H1/00; G01P15/135; H01H35/14

JP57166524A
JP2251725A
JP1021804A
JP10154451A
JP1164087A
JP200021277A
JP2000173420A
JP2001208770A

US5025246
US3706867
US4331171
US5168138
US5332876
US6198396

Kimio Hashimoto
Yoichi Hashimoto

Previous Patent: PROCESSOR FOR CALCULATING AVERAGE QUEUE LENGTH

Next Patent: BROADBAND ANTENNA