Acceleration detecting apparatus
AssigneeKabushiki Kaisha Tokai Rika Denki Seisakusho
InventorsHitoshi Iwata, Katsuya Kogiso, Kenichi Kinoshita
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Abstract
An accelerometer sensor is disclosed, utilizing a casing having a center axis, and a pressure sensitive element located at the bottom portion of the casing. A gel based medium is accommodated in the casing. Given that "x" denotes a positional deviation of the pressure sensitive element with respect to the center axis of the casing and that "h" denotes a height of the medium in the casing, the positional deviation (x) and the height (h) are set such that the value 2 x/h falls within a predetermined range and serves as a function of the anisotropic sensitivity ratio of the sensor.
Claims8
A sensor for detecting the acceleration of an object to which the sensor is attached, comprising:
- a casing having a bottom portion and a center axis;
- a pressure sensitive element located at the bottom portion of said casing at a position that deviates from said center axis by a value "x";
- and
- a gel based medium filled within said casing to a height "h", measured relative to the height of said casing, said medium being used to apply pressure to said pressure sensitive element, said value x and said height h being adjusted to set an anisotropic sensitivity ratio of the sensor to a desired value, wherein the anisotropic ratio is equal to the value of 2 x/h.
A sensor for detecting the acceleration of an object to which the sensor is attached, comprising:
- a casing having a bottom portion and a center axis;
- a pressure sensitive element located at the bottom portion of said casing at a position that deviates from said center axis by value "x";
- and
- a gel based medium filled within said casing to a height "h", measured relative to the of said casing, said medium being used to apply pressure to said pressure sensitive element, said value x and said height h being adjusted to set an anisotropic sensitivity ratio of the sensor to a desired value, wherein the anisotropic ratio is equal to the value of 2 x/h, wherein said casing has a cylindrical shape with a diameter no bigger than 13 mm.
A method of setting the anisotropic sensitivity of an accelerometer sensor having a casing with a center axis, a pressure sensitive element disposed at the bottom portion of the casing, and a medium filled in the casing, the method comprising the steps of:
- using a gel composition as said medium;
- adjusting a height "h" of said medium in said casing and a positional deviation "x" of said pressure sensitive element with respect to the center axis of said casing, in order to set the anisotropic sensitivity ratio of said sensor to a desired value;
- and
- wherein the relationship between the height "h" of said medium in said casing and the deviation "x" of said pressure sensitive element from the center axis of said casing is 2 x/h, the value of which is a function of the anisotropic sensitivity ratio.
Dependencies are inferred from the claim text.