Acceleration detector
First Claim
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1. An acceleration detector for triggering passenger protection devices in motor vehicles, comprising a plate-like spring;
- means for fixing one end portion of said spring while leaving the opposite end portion free;
means for retaining an intermediate portion of said spring to define a non-bending spring area between the intermediate and the fixed end portions, and a flexible spring area between the free end and the intermediate portions;
a seismic mass secured to said free end portion to form therewith a flexural resonator;
at least one expansion sensitive resistor arranged on said flexible spring area; and
an active evaluation circuit arranged on said non-bending spring area and being connected to said at least one expansion sensitive resistor to evaluate its condition.
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Abstract
An acceleration detector, the spring is a substrate plate, e.g., of Al2 O3, which is fixed at one end in a housing. The resistors and the evaluating circuit are arranged on the spiral spring and can be applied to the substrate plate in a single work step using thick-film technology.
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Citations
6 Claims
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1. An acceleration detector for triggering passenger protection devices in motor vehicles, comprising a plate-like spring;
- means for fixing one end portion of said spring while leaving the opposite end portion free;
means for retaining an intermediate portion of said spring to define a non-bending spring area between the intermediate and the fixed end portions, and a flexible spring area between the free end and the intermediate portions;
a seismic mass secured to said free end portion to form therewith a flexural resonator;
at least one expansion sensitive resistor arranged on said flexible spring area; and
an active evaluation circuit arranged on said non-bending spring area and being connected to said at least one expansion sensitive resistor to evaluate its condition. - View Dependent Claims (2, 3, 4, 5, 6)
- means for fixing one end portion of said spring while leaving the opposite end portion free;
Specification