Acceleration sensor with a circuit board separated from a base plate by a space
First Claim
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1. An acceleration sensor comprising:
- an acceleration detecting element comprising a piezoelectric element subjected to polarization processing, and a weight fastened on said piezoelectric element and composed of a material having a coefficient of thermal expansion equal to that of said piezoelectric element;
a circuit board on which said acceleration detecting element is mounted, said acceleration detecting element being mounted at a center position of a major surface of said circuit board, such that the direction in which acceleration is to be detected is parallel to the major surface of said circuit board;
a base plate arranged opposed to said circuit board while being separate from said circuit board by a space;
at least one connecting terminal extending from said circuit board toward one side of said base plate, and projecting away from an opposite side of said base plate, and fixed to said base plate, said connecting terminal comprising a plurality of connecting terminals arranged along each of a pair of opposite sides of said circuit board in a rectangular shape, and said acceleration detecting element being mounted on said circuit board so that the direction in which acceleration is to be detected is a direction orthogonal to the direction in which said connecting terminals are aligned along said circuit board; and
a substrate supporting member arranged between said circuit board and said base plate for separating the same.
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Abstract
An acceleration sensor 1 comprises a circuit board 3 on which an acceleration detecting element 2 is carried. A plurality of connecting terminals 4 arranged along the periphery of the circuit board 3 are projected outward after penetrating through a metal base plate 5. The metal base plate 5 is fixed to the connecting terminals 4 spaced apart from the circuit board 3 by a predetermined distance in a state being insulated from the connecting terminals 4. The peripheral edge of the metal base plate 5 is connected to a case 7 covering the entire acceleration sensor 1. Circuit elements constituting a signal processing circuit for processing a detection signal of the acceleration detecting element 2 are arranged on the upper surface and the lower surface of the circuit board 3.
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Citations
21 Claims
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1. An acceleration sensor comprising:
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an acceleration detecting element comprising a piezoelectric element subjected to polarization processing, and a weight fastened on said piezoelectric element and composed of a material having a coefficient of thermal expansion equal to that of said piezoelectric element; a circuit board on which said acceleration detecting element is mounted, said acceleration detecting element being mounted at a center position of a major surface of said circuit board, such that the direction in which acceleration is to be detected is parallel to the major surface of said circuit board; a base plate arranged opposed to said circuit board while being separate from said circuit board by a space; at least one connecting terminal extending from said circuit board toward one side of said base plate, and projecting away from an opposite side of said base plate, and fixed to said base plate, said connecting terminal comprising a plurality of connecting terminals arranged along each of a pair of opposite sides of said circuit board in a rectangular shape, and said acceleration detecting element being mounted on said circuit board so that the direction in which acceleration is to be detected is a direction orthogonal to the direction in which said connecting terminals are aligned along said circuit board; and a substrate supporting member arranged between said circuit board and said base plate for separating the same. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification
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Current AssigneeMurata Manufacturing Co Limited
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Original AssigneeMurata Manufacturing Co Limited
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InventorsAsano, Hiroshi, Yamashita, Muneharu, Mizuno, Toshihiro, Ichimaru, Masayuki, Tabota, Jun
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Primary Examiner(s)Kwok, Helen C.
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Application NumberUS08/925,896Time in Patent Office1,058 DaysField of Search73/493, 73/431, 73/514.16, 73/514.34US Class Current73/493CPC Class CodesG01P 1/023 for acceleration measuring ...G01P 15/0915 of the shear mode typeH05K 3/306 Lead-in-hole components, e....
