Capacitive detector for absolute pressure
First Claim
1. A capacitive detector for the measurement of the absolute pressure of a medium, which comprises:
- a first insulating plate functioning as a base;
a stationary capacitor plate attached onto said first insulating plate;
a silicon plate attached onto said first insulating plate and having a thin, membrane-like middle portion functioning as a mobile capacitor plate and defining a chamber between itself and said first insulating plate, and a channel allowing free entrance of the medium into said chamber;
a second insultating plate attached hermetically onto said silicon plate so as to define an aneroid capsule between itself and said membrane-like middle portion, the distance of said membrane-like middle portion from said stationary capacitor plate being a function of the absolute pressure to be measured;
a first terminal arranged outside said silicon plate in conductive contact therewith, anda second terminal arranged outside said silicon plate; and
a conductor electrically connecting said second terminal with said stationary capacitor plate through said channel.
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Accused Products
Abstract
A capacitive detector for absolute pressure, which comprises a base and a stationary capacitor plate (7) attached onto the base (3). An aneroid capsule (4) is arranged in connection with the base (3) and provided with a mobile capacitor plate area (5, 6) directed towards the base (3) and changing its distance from the stationary capacitor plate (7) by the effect of pressure. A silicon plate (2) is attached onto the base and has membrane-like middle portion (5, 6) acting as a mobile capacitor plate. A plate structure (1) is attached hermetically onto the silicon plate (2) such that the space of the aneroid capsule (4) is located between the plate structure (1) and the silicon plate (2).
37 Citations
8 Claims
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1. A capacitive detector for the measurement of the absolute pressure of a medium, which comprises:
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a first insulating plate functioning as a base; a stationary capacitor plate attached onto said first insulating plate; a silicon plate attached onto said first insulating plate and having a thin, membrane-like middle portion functioning as a mobile capacitor plate and defining a chamber between itself and said first insulating plate, and a channel allowing free entrance of the medium into said chamber; a second insultating plate attached hermetically onto said silicon plate so as to define an aneroid capsule between itself and said membrane-like middle portion, the distance of said membrane-like middle portion from said stationary capacitor plate being a function of the absolute pressure to be measured; a first terminal arranged outside said silicon plate in conductive contact therewith, and a second terminal arranged outside said silicon plate; and a conductor electrically connecting said second terminal with said stationary capacitor plate through said channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification