Deceleration sensor
First Claim
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1. A deceleration sensor comprising:
- magnetically soft core means having an electrical coil wound thereon,permanent magnet means for creating a magnetic flux,spring means,a movable ferromagnetic member normally biased by said spring means and adapted to be displaced against said spring means in response to deceleration to thereby change the magnetic flux acting on said magnetically soft core means, anddetection means for applying a predetermined pulse voltage to said electric coil to saturate said core means and for detecting changes in the external magnetic field strength provided by said permanent magnet means acting on said magnetically soft core means according to changes in the relative position of said ferromagnetic material member, comprising means for producing an output signal indicative of the deceleration based on the time between application of said pulse voltage and saturation of said core means.
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Abstract
A deceleration sensor comprising a magnetically soft core having an electrical coil wound thereon, a permanent magnet, a spring, and a ferromagnetic member adapted to be displaced against the action of the spring in response to deceleration to thereby change the magnetic flux acting on the magnetically soft core. A pulse voltage is applied to one end of the electrical coil and a corresponding voltage drop develops across a resistor connected to the other end of the coil with a delay corresponding to a deceleration. This delay may be represented in the form of an analog voltage or digital code.
22 Citations
39 Claims
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1. A deceleration sensor comprising:
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magnetically soft core means having an electrical coil wound thereon, permanent magnet means for creating a magnetic flux, spring means, a movable ferromagnetic member normally biased by said spring means and adapted to be displaced against said spring means in response to deceleration to thereby change the magnetic flux acting on said magnetically soft core means, and detection means for applying a predetermined pulse voltage to said electric coil to saturate said core means and for detecting changes in the external magnetic field strength provided by said permanent magnet means acting on said magnetically soft core means according to changes in the relative position of said ferromagnetic material member, comprising means for producing an output signal indicative of the deceleration based on the time between application of said pulse voltage and saturation of said core means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A deceleration sensor comprising:
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magnetically soft core means having an electrical coil wound thereon, permanent magnet means for creating a magnetic flux; spring means; and a movable ferromagnetic member normally biased by said spring means and adapted to be displaced against said spring means in response to deceleration to thereby change the magnetic flux acting on said magnetically soft core means; wherein the magnetic flux acting on said magnetically soft core means also passes through said movable ferromagnetic member, said magnetically soft core means at least partially shielded by said movable ferromagnetic member; wherein said magnetically soft core means, permanent magnetic means, and spring means comprise two magnetically soft cores, two permanent magnets, and two springs, respectively wherein one magnetically soft core faces one permanent magnet and the other magnetically soft core faces the other permanent magnet. - View Dependent Claims (36, 37, 38, 39)
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Specification