Impact sensing device
First Claim
1. An impact sensing device comprising:
- springs;
an inertia member having a cylindrical structure, upper and lower portions, and at least three semispherical projections disposed equiangularly on an outer peripheral surface thereof;
a housing for accommodating said inertia member therein and having a cylindrical structure with a center axis, said cylindrical housing being disposed such that the center axis thereof is in a vertical direction and the cylindrical inertia member is coaxially retained therein and is suspensively supported at the upper and lower portions by the springs; and
at least three impact sensors disposed in the housing to be equiangularly spaced apart from each other, number of said impact sensors being the same as that of the semispherical projections so that respective tip portions of the impact sensors are in contact with the corresponding semispherical projections, each impact sensor including a piezoelectric element for generating a voltage having an amplitude corresponding to an applied stress, and an urging member for urging the piezoelectric sensor against said inertia member so that upon application of an impact force to the impact sensor, said inertia member presses the piezoelectric element with a stress corresponding to the impact force to allow the piezoelectric element to generate a voltage having an amplitude corresponding to the applied impact force.
1 Assignment
0 Petitions
Accused Products
Abstract
An impact sensing device including an inertia member, an housing for accommodating the inertia member therein and at least three impact sensors disposed in such a manner as to be in contact with an outer peripheral surface of the inertia member, each impact sensor comprising a piezoelectric element for generating a voltage having an amplitude corresponding to an applied stress and an urging member for urging the piezoelectric sensor against the inertia member. Upon application of an impact force to the impact sensor, the inertia member presses the piezoelectric element with a stress corresponding to the impact force to thereby allow the piezoelectric element to generate a voltage corresponding to the applied stress.
15 Citations
5 Claims
-
1. An impact sensing device comprising:
-
springs; an inertia member having a cylindrical structure, upper and lower portions, and at least three semispherical projections disposed equiangularly on an outer peripheral surface thereof; a housing for accommodating said inertia member therein and having a cylindrical structure with a center axis, said cylindrical housing being disposed such that the center axis thereof is in a vertical direction and the cylindrical inertia member is coaxially retained therein and is suspensively supported at the upper and lower portions by the springs; and at least three impact sensors disposed in the housing to be equiangularly spaced apart from each other, number of said impact sensors being the same as that of the semispherical projections so that respective tip portions of the impact sensors are in contact with the corresponding semispherical projections, each impact sensor including a piezoelectric element for generating a voltage having an amplitude corresponding to an applied stress, and an urging member for urging the piezoelectric sensor against said inertia member so that upon application of an impact force to the impact sensor, said inertia member presses the piezoelectric element with a stress corresponding to the impact force to allow the piezoelectric element to generate a voltage having an amplitude corresponding to the applied impact force. - View Dependent Claims (2, 3, 4, 5)
-
Specification