Sensor for detecting acceleration and angular velocity
First Claim
1. A sensor for detecting acceleration and angular velocity, comprising an acceleration detecting section and an angular velocity detecting section,the acceleration detecting section comprising:
- a weight body for acceleration detection;
a pedestal for acceleration detection arranged in such a manner as to surround the weight body for acceleration detection;
a flexible connection for acceleration detection for connecting the weight body for acceleration detection and the pedestal for acceleration detection;
the flexible connection for acceleration detection including a plurality of plate-like bridge portions, each of the plate-like bridge portions of the flexible connection for acceleration detection including a piezoresistive element arranged on an inner side that is closer to the weight body for acceleration detection and a piezoresistive element arranged on an outer side that is closer to the pedestal for acceleration detection;
the piezoresistive elements being embedded in a surface layer of the flexible connection for acceleration detection; and
an acceleration detecting circuit for detecting an applied acceleration based on changes in electrical resistance of the piezoresistive elements,the angular velocity detecting section comprising;
a weight body for angular velocity detection;
a pedestal for angular velocity detection arranged in such a manner as to surround the weight body for angular velocity detection;
a flexible connection for angular velocity detection for connecting the weight body for angular velocity detection and the pedestal for angular velocity detection;
the flexible connection for angular velocity detection including a plurality of plate-like bridge portions, each of the plate-like bridge portions of the flexible connection for angular velocity detection including a driving piezoelectric element arranged on an inner side that is closer to the weight body for angular velocity detection, a driving piezoelectric element arranged on an outer side that is closer to the pedestal for angular velocity detection, a detecting piezoelectric element arranged on an inner side that is closer to the weight body for angular velocity detection, a detecting piezoelectric element arranged on an outer side that is closer to the pedestal for angular velocity detection;
the driving piezoelectric elements and the detecting piezoelectric elements being fixed directly or indirectly to a surface of the flexible connection for angular velocity detection; and
an angular velocity detecting circuit for detecting an applied angular velocity based on a signal generated in the detecting piezoelectric element while supplying an alternating signal to the driving piezoelectric element to periodically deform the flexible connection for angular velocity detection and to generate a periodic motion of the weight body for angular velocity detection, whereinthe pedestal for acceleration detection and the pedestal for angular velocity detection form a monolithic structure and are fixed to a device chassis.
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Accused Products
Abstract
Static and dynamic acceleration as well as static and dynamic angular velocity are detected with a simple structure. An acceleration detecting section includes a weight body, a pedestal around the weight body, flexible plate-like bridge portions, and piezoresistive elements embedded in the upper surface of the bridge portions. An angular velocity detecting section includes a weight body, a pedestal around the weight body, flexible plate-like bridge portions, and piezoelectric elements fixed to the upper surface of the bridge portions. The pedestals are fixed to a device chassis. When the weight body is displaced by acceleration, the plate-like bridge portions are deflected, so that the acceleration is detected based on the change in the electrical resistances of the piezoresistive elements. When the weight body is displaced by a Coriolis force based on angular velocity while supplying alternating signals to the piezoelectric elements to oscillate the weight body, the plate-like bridge portions are deflected, so that the angular velocity is detected based on charge generation in the piezoelectric elements.
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Citations
24 Claims
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1. A sensor for detecting acceleration and angular velocity, comprising an acceleration detecting section and an angular velocity detecting section,
the acceleration detecting section comprising: -
a weight body for acceleration detection;
a pedestal for acceleration detection arranged in such a manner as to surround the weight body for acceleration detection;a flexible connection for acceleration detection for connecting the weight body for acceleration detection and the pedestal for acceleration detection;
the flexible connection for acceleration detection including a plurality of plate-like bridge portions, each of the plate-like bridge portions of the flexible connection for acceleration detection including a piezoresistive element arranged on an inner side that is closer to the weight body for acceleration detection and a piezoresistive element arranged on an outer side that is closer to the pedestal for acceleration detection;
the piezoresistive elements being embedded in a surface layer of the flexible connection for acceleration detection; andan acceleration detecting circuit for detecting an applied acceleration based on changes in electrical resistance of the piezoresistive elements, the angular velocity detecting section comprising; a weight body for angular velocity detection; a pedestal for angular velocity detection arranged in such a manner as to surround the weight body for angular velocity detection; a flexible connection for angular velocity detection for connecting the weight body for angular velocity detection and the pedestal for angular velocity detection;
the flexible connection for angular velocity detection including a plurality of plate-like bridge portions, each of the plate-like bridge portions of the flexible connection for angular velocity detection including a driving piezoelectric element arranged on an inner side that is closer to the weight body for angular velocity detection, a driving piezoelectric element arranged on an outer side that is closer to the pedestal for angular velocity detection, a detecting piezoelectric element arranged on an inner side that is closer to the weight body for angular velocity detection, a detecting piezoelectric element arranged on an outer side that is closer to the pedestal for angular velocity detection;the driving piezoelectric elements and the detecting piezoelectric elements being fixed directly or indirectly to a surface of the flexible connection for angular velocity detection; and an angular velocity detecting circuit for detecting an applied angular velocity based on a signal generated in the detecting piezoelectric element while supplying an alternating signal to the driving piezoelectric element to periodically deform the flexible connection for angular velocity detection and to generate a periodic motion of the weight body for angular velocity detection, wherein the pedestal for acceleration detection and the pedestal for angular velocity detection form a monolithic structure and are fixed to a device chassis. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A sensor for detecting acceleration and angular velocity, comprising:
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a weight body; a pedestal arranged in such a manner as to surround the weight body and fixed to a device chassis; a flexible connection for connecting the weight body and the pedestal; a piezoresistive element embedded in a surface layer of the flexible connection; a driving piezoelectric element and a detecting piezoelectric element fixed directly or indirectly to a surface of the flexible connection; an acceleration detecting circuit for detecting an applied acceleration based on a change in an electrical resistance of the piezoresistive element; and an angular velocity detecting circuit for detecting an applied angular velocity based on a signal generated in the detecting piezoelectric element while supplying an alternating signal to the driving piezoelectric element to periodically deform the flexible connection and to generate a periodic motion of the weight body, wherein the flexible connection includes a plurality of plate-like bridge portions, each plate-like bridge portion includes a plurality of the piezoresistive elements arranged, respectively, on an inner side that is closer to the weight body and on an outer side that is closer to the pedestal, and each plate-like bridge portion includes a plurality of the driving piezoelectric elements arranged, respectively, on the inner and outer sides and detecting piezoelectric elements arranged, respective on the inner and outer sides. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A sensor for detecting acceleration and angular velocity, comprising:
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a weight body; a pedestal arranged to a side of the weight body and fixed to a device chassis; a flexible connection for connecting the weight body and the pedestal;
the flexible connection including a plate-like bridge portion connecting an upper part of the weight body and an upper part of the pedestal, a lower part of the pedestal being fixed to the device chassis, the plate-like bridge portion including piezoresistive elements arranged, respectively, at a first position close to the weight body and at a second position close to the pedestal, and further including driving piezoelectric elements arranged, respectively, at the first position and at the second position and detecting piezoelectric elements arranged, respectively, at the first position and at the second position, the piezoresistive elements being embedded in an upper surface layer of the flexible connection, and the driving piezoelectric elements and the detecting piezoelectric elements being fixed directly or indirectly to an upper surface of the flexible connectionan acceleration detecting circuit for detecting an applied acceleration based on changes in electrical resistance of the piezoresistive elements; and an angular velocity detecting circuit for detecting an applied angular velocity based on signals generated in the detecting piezoelectric elements while supplying alternating signals to the driving piezoelectric elements to periodically deform the flexible connection and to generate a periodic motion of the weight body. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification