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Patent US5559291A successfully refreshed from Google Patents.
US5559291A
Expired / Lapsed
US
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Angular velocity sensor
Assignee: Murata Manufacturing Co Ltd
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Filing: 1994-01-28
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Granted: 1996-09-24
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Expires: 2014-01-28
Abstract
Abstract An angular velocity sensor arranged to minimize the influence of viscous resistance of gases in association with a vibratory member, and to enhance the sensitivity of angular velocity detection through reduction of noises. The angular velocity sensor includes a first vibratory member supported on a first support beam for vibration in horizontally lateral direction perpendicular to the support axis, a second vibratory member horiztonally supported through a second support beam at a position on the support axis and inward of the first vibratory member for vibrations in the horizontally lateral direction and at the same time in the vertical direction to the face of an upper substrate, and a vibration generating means for imparting vibrations to the first and second vibratory members in the horizontally lateral direction. With these arrangements, when a turning moment about the support axis is applied, the second vibratory member is displaced in the vertical direction under the influence of Coriolis force, and an angular velocity signal indicative of this displacement is produced by a displacement detector.
Inventors
- 👤 Tomoyasu Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:50
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/56; G01C19/5719
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
137 words
A semiconductor angular velocity sensor, comprising: a substrate; a first vibratory member supported on said substrate and parallel thereto through a first support beam for vibration in a lateral direction relative to said substrate; a second vibratory member supported in axial alignment with the support axis of said first support beam and supported on said first vibratory member and parallel thereto through a second support beam for vibrating in the lateral direction and also in a perpendicular direction relative to the face of said substrate; a vibration generating means vibrating said first vibratory member and second vibratory member in the lateral direction relative to said substrate; and a displacement detection means detecting the extent of displacement of said second vibratory member in the perpendicular direction while the second vibratory member is vibrated by the vibration generating means.
Claim 2
Dependent Claim
137 words
A semiconductor angular velocity sensor, comprising: a substrate; a first vibratory member supported on said substrate and parallel thereto through a first support beam for vibration in a lateral direction relative to said substrate; a second vibratory member supported in axial alignment with the support axis of said first support beam and supported on said first vibratory member and parallel thereto through a second support beam for vibrating in the lateral direction and also in a perpendicular direction relative to the face of said substrate; a vibration generating means vibrating said first vibratory member and second vibratory member in the lateral direction relative to said substrate; and a displacement detection means detecting the extent of displacement of said second vibratory member in the perpendicular direction while the second vibratory member is vibrated by the vibration generating means.
Claim 3
Dependent Claim
74 words
An angular velocity sensor as defined in claim 1, wherein said vibration generating means is constituted by movable conducting sections located at opposite lateral sides of said first support beam and stationary conducting sections provided on the part of said substrate in face to face relation with said movable conducting sections, and vibrates said first vibratory member together with said second vibratory member upon application of a frequency signal to the respective conducting sections.
Claim 4
Dependent Claim
52 words
An angular velocity sensor as defined in claim 1, wherein said displacement detection means is constituted by a bridge circuit containing a pair of piezoresistance elements located on said second support beam in spaced positions in the transverse direction thereof and a pair of piezoresistance elements located on said first vibratory member.
Claim 5
Dependent Claim
69 words
An angular velocity sensor as defined in claim 1, wherein said displacement detection means is constituted by a conducting section provided on said second vibratory member and another conducting section provided on said substrate in confronting relation with said first-mentioned conducting section, and adapted to detect a displacement of said second vibratory member in said perpendicular direction by way of a variation in capacitance between said two conducting sections.
Claim 6
Dependent Claim
46 words
An angular velocity sensor as defined in claim 1, wherein said vibratory member is a cantilever frame having a central opening supported on said first support beam, and said second vibratory member is a cantilever plate supported on said second support beam in said central opening.
Claim 7
Dependent Claim
63 words
An angular velocity sensor as defined in claim 1, wherein said first vibratory memory is a frame having a central opening and the opposite ends thereof supported by a pair of said first support beams aligned with each other on a common support axis, and said second vibratory member is a cantilever plate supported on said second support beam in said central opening.
Claim 8
Dependent Claim
51 words
An angular velocity sensor as defined in claim 1, wherein said substrate is composed of a lower substrate and an upper substrate joined with each other through an insulation layer, said first and second vibratory members being integrally formed in said upper substrate in a shaping process for said upper substrate.
Claim 9
Dependent Claim
27 words
An angular velocity sensor as defined in claim 7, wherein said lower substrate includes a recess so that said first and second vibratory members can freely vibrate.
Claim 10
Dependent Claim
32 words
An angular velocity sensor as defined in claim 1, wherein said first vibratory member, said second vibratory member, said first support beam and said second support beam lie in the same plane.
Claim 11
Dependent Claim
41 words
An angular velocity sensor as defined in claim 1, wherein said displacement detection means is a diffused resistance element located on said second support beam which is formed by diffusing an impurity and said substrate is formed of a silicon material.
Claim 12
Dependent Claim
151 words
A semiconductor angular velocity sensor, comprising: a substrate; a first vibratory member in the shape of a frame having a central opening, supported on said substrate and parallel thereto through a first support beam for vibration in a lateral direction relative to said substrate; a second vibratory member supported in axial alignment with the support axis of said first support beam and supported within the frame of said first vibratory member and parallel thereto through a second support beam for vibration in the lateral direction and also in a perpendicular direction relative to the face of said substrate; a vibration generating means vibrating said first vibratory member and said second vibratory member in the lateral direction relative to said substrate; and a displacement detection means detecting the extent of displacement of said second vibratory member in the perpendicular direction while the second vibratory member is vibrated by the vibration generating means.
Claim 13
Dependent Claim
151 words
A semiconductor angular velocity sensor, comprising: a substrate; a first vibratory member in the shape of a frame having a central opening, supported on said substrate and parallel thereto through a first support beam for vibration in a lateral direction relative to said substrate; a second vibratory member supported in axial alignment with the support axis of said first support beam and supported within the frame of said first vibratory member and parallel thereto through a second support beam for vibration in the lateral direction and also in a perpendicular direction relative to the face of said substrate; a vibration generating means vibrating said first vibratory member and said second vibratory member in the lateral direction relative to said substrate; and a displacement detection means detecting the extent of displacement of said second vibratory member in the perpendicular direction while the second vibratory member is vibrated by the vibration generating means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-24 | 2000-03-25 | 2000-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-24 | 2004-03-25 | 2004-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-24 | 2008-03-25 | 2008-09-24 | $7700.00 | Window Closed / Lapsed |