Semiconductor accelerometer

Details Semiconductor accelerometer Semiconductor accelerometer

1993-11-16

1996-04-02

Jackson, Jr., Jerome

Active solid-state devices (e.g., transistors, solid-state diode

Field effect device

Responsive to non-optical, non-electrical signal

257415, 257417, 257419, H01L 2978, H01L 2984

Patent

active

055043569

ABSTRACT:
This invention aims at providing a novel semiconductor accelerometer comprising a smaller number of substrates and a production method thereof.
An insulating film is formed on a main plane of a P-type silicon substrate, and a beam-like movable electrode is formed on the insulating film. Fixed electrodes are then formed on both sides of the movable electrode in self-alignment with the movable electrode by diffusing an impurity into the P-type silicon substrate, and the insulating film below the movable electrode is etched and removed. There is thus produced a semiconductor accelerometer comprising the P-type silicon substrate 1, the movable electrode 4 having the beam structure and disposed above the P-type silicon substrate 1 with a predetermined gap between them, and the fixed electrodes 8, 9 consisting of the impurity diffusion layer and formed on both sides of the movable electrode 4 on the P-type silicon substrate 1 in self-alignment with the movable electrode 4. This sensor can detect acceleration from the change (increase/decrease) of a current between the fixed electrodes 8 and 9 resulting from the displacement of the movable electrode 4 due to acceleration.

REFERENCES:
patent: 3440873 (1969-04-01), Eichelberger
patent: 4481042 (1984-11-01), Takigawa
patent: 4873871 (1989-10-01), Bai
patent: 4894698 (1990-01-01), Takeuchi et al.

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