Load sensor employing a crystal unit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
Jun 27, 2002
app pub date -
Dec 21, 2001
filing date -
Dec 22, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A load sensor measuring a load by a change in oscillation frequency of a crystal (quartz) blank due to stress sensibility against thereof when a load is applied to opposing outer circumferential portions of the crystal blank. In the sensor, the crystal blank is formed in a shape such that when the load is applied, any mechanical deformation in a direction perpendicular to the plane of the blank is prevented. For example, the crystal blank is constituted by two regions, a vibrating portion having a relatively small thickness and a protective frame portion having a relatively large thickness. Alternatively, in a planar blank, a groove is formed so as to extend along the outer circumference of the blank. In the rectangular blank, the frame portion or groove is preferably arranged along sides of the blank parallel with a direction in which the load is applied.
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