Acceleration sensor |
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| 申请号 | JP27948889 | 申请日 | 1989-10-26 | 公开(公告)号 | JPH03140875A | 公开(公告)日 | 1991-06-14 |
| 申请人 | Nippon Seiko Kk; | 发明人 | TANAKA HIROSHI; | ||||
| 摘要 | PURPOSE: To make an acceleration sensor conduct an accurate switching operation even in a cryogenic environment by putting a conductive substance in an insulative hermetically-sealed container and by heating the conductive substance. CONSTITUTION: A mercury grain 2 as a conductive substance is put movably in an insulative hermetically-sealed container 1, which is fitted and fixed on a horizontal surface 5a of a fitting body 5 so that it is inclined at a prescribed angle θ to the surface. A heating body 4 is fitted to the fitting body 5 so that it is in proximity to the lower end part of the container 1, and two lead wires 8 are extended from the heating body 4 and connected to an electric circuit not shown in the figure. The electric circuit 5 electrifies the heating body 4 through the lead wires 8 at all times in a cryogenic temperature, so as to heat the mercury grain 2 in the container 1. Thereby the mercury grain 2 can be kept at the temperature of a melting point or above, even in the cryogenic temperature. Accordingly, the mercury grain 2 in the container 1 is kept in a state of liquid even when an acceleration sensor is employed in a cryogenic environment, and therefore the acceleration sensor conducts a reliable switching operation. COPYRIGHT: (C)1991,JPO&Japio |
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