Opto-electrical acceleration sensor having a mechanical tilting

Details Opto-electrical acceleration sensor having a mechanical tilting Opto-electrical acceleration sensor having a mechanical tilting

1989-06-08

1991-05-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73517R, G01D 534

Patent

active

050139096

ABSTRACT:
An acceleration sensor (10) comprises a light transmitter (21) and a light receiver (37) arranged opposite each other on one optical axis (z). A tilting element (45) of axially symmetrical design, relative to the said axis (z), is arranged coaxially to the said axis (z) in a first operating position. It is provided with a passage opening (47) extending coaxially to the axis (z). Holding means (30, 31) serve for holding the tilting element (45) in a first operating position at a predetermined force in the direction of the axis (z). Guide means (27, 29, 31, 46, 48, 49) permit the tilting element (45), when an acceleration acts upon the tilting element (45), in a direction (x, y) perpendicular to the axis (z), to perform a limited tilting movement against the action of the predetermined force, about a center of rotation arranged at a distance from the axis, into a second operating position. In order to make the acceleration sensor insensitive to accelerations in the direction of the axis (z), the tilting element (45) is designed, as regards its mass distribution in space, in a manner such that the ratio of the breakaway acceleration required for causing the tilting element (45) to be lifted off in the direction of the axis (z) and the tilting acceleration required for causing the tilting element to tilt about its center of rotation is greater than one.

REFERENCES:
patent: 3778572 (1973-12-01), Matsui et al.
patent: 3798454 (1974-03-01), Weiss
patent: 4737630 (1988-04-01), Andersson

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