Semiconductor yaw rate sensor
First Claim
1. A semiconductor yaw rate sensor comprising:
- a semiconductor substrate;
a movable electrode having a beam structure disposed upon said semiconductor substrate at a specified interval therefrom;
a first fixed electrode for excitation use disposed via a specified gap with said movable electrode to cause vibration of said movable electrode at a specified cycle by means of electrostatic force; and
a second fixed electrode for current detection use provided on said semiconductor substrate opposing said movable electrode;
wherein when yaw rate to be detected, which has as an axis a direction intersecting a direction of excitation of said movable electrode, acts upon said movable electrode, said yaw rate is detected based on a change in current produced at said second fixed electrode by means of a change in relative position of said movable electrode and said second fixed electrode.
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Abstract
A semiconductor yaw rate sensor, which can be structured easily by means of an IC fabrication process, such that a yaw rate detection signal due to a current value is obtained by means of a transistor structure and a method of producing the same is disclosed. A weight supported by beams is disposed at a specified interval from a surface of a semiconductor substrate, and movable electrodes and excitation electrodes are formed integrally with the weight. Fixed electrodes for excitation use are fixed to the substrate in correspondence to the excitation electrodes. Along with this, source electrodes as well as drain electrodes are formed by means of a diffusion layer on a surface of the substrate at positions opposing the movable electrodes, such that drain current changes in correspondence with displacement of the movable electrodes by means of Corioli'"'"'s force due to yaw rate, and the yaw rate is detected by this current.
38 Citations
27 Claims
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1. A semiconductor yaw rate sensor comprising:
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a semiconductor substrate; a movable electrode having a beam structure disposed upon said semiconductor substrate at a specified interval therefrom; a first fixed electrode for excitation use disposed via a specified gap with said movable electrode to cause vibration of said movable electrode at a specified cycle by means of electrostatic force; and a second fixed electrode for current detection use provided on said semiconductor substrate opposing said movable electrode; wherein when yaw rate to be detected, which has as an axis a direction intersecting a direction of excitation of said movable electrode, acts upon said movable electrode, said yaw rate is detected based on a change in current produced at said second fixed electrode by means of a change in relative position of said movable electrode and said second fixed electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A semiconductor yaw rate sensor comprising:
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a semiconductor substrate; a movable electrode disposed at a first interval above a surface of said semiconductor substrate, and supported so as to be freely displacable via a beam structure body; a fixed electrode for excitation use disposed at a second interval above said semiconductor substrate surface, and disposed via a specified gap with said movable electrode to utilize static electricity to cause vibration of said movable electrode; and source and drain electrodes formed by means of an impurity diffusion layer on a surface portion of said semiconductor substrate at positions opposing said movable electrode; wherein a transistor is formed by said movable electrode, said semiconductor substrate and said source and drain electrodes, a current change is produced between said source and drain electrodes by means of displacement of said movable electrode produced when said fixed electrode vibrates said movable electrode at a specified cycle, and yaw rate is detected by means of said current change. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification