Patent US4393709A successfully refreshed from Google Patents.
US4393709A
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Direction detection apparatus
Assignee: Alps Alpine Co Ltd
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Filing: 1981-11-12
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Granted: 1983-07-19
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Expires: 2001-11-12
Abstract
Abstract A direction detection apparatus which detects the traveling direction of a moving object on the basis of the movement of a weight. It comprises a centrifugal force detector, a clock signal generator, and a velocity detector, and also a detection device which receives signals from the detectors and the generator to provide a directional angle.
Inventors
- 👤 Masatoshi Harumatsu
- 👤 Makoto Tomoyori
- 👤 Noboru Tsushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:17
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/10; G01P; G01P13/00; G01P13/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A direction detection apparatus comprising a centrifugal force detector including a weight and a detecting means for detecting a movement of said weight and generating a centrifugal force signal, a clock signal generator generating a time signal, a velocity detector generating a velocity signal, and a computation means connected to said force detector, clock signal generator and velocity generator to compute a directional angle on the basis of said centrifugal force signal, said time signal and said velocity signal.
Claim 2
Dependent Claim
79 words
A direction detection apparatus comprising a centrifugal force detector including a weight and a detecting means for detecting a movement of said weight and generating a centrifugal force signal, a clock signal generator generating a time signal, a velocity detector generating a velocity signal, and a computation means connected to said force detector, clock signal generator and velocity generator to compute a directional angle on the basis of said centrifugal force signal, said time signal and said velocity signal.
Claim 3
Dependent Claim
33 words
A direction detection apparatus according to claim 1, wherein said detecting means of said centrifugal force detector is constructed of thread resistors which are expanded and contracted by the movement of said weight.
Claim 4
Dependent Claim
33 words
A direction detection apparatus according to claim 1, wherein said detecting means of said centrifugal force detector is constructed of pressure-sensitive resistance elements whose resistances are changed by the movement of said weight.
Claim 5
Dependent Claim
37 words
A direction detection apparatus according to claim 1, wherein said detecting means of said centrifugal force detector is constructed of a piezoelectric transducer in the form of a cantilever and said weight is mounted on said cantilever.
Claim 6
Dependent Claim
29 words
A direction detection apparatus according to claim 1, wherein said detecting means of said centrifugal force detector is constructed of an electrostriction transducer on which said weight is mounted.
Claim 7
Dependent Claim
38 words
A direction detection apparatus according to claim 1, wherein said detecting means of said centrifugal force detector is constructed of a diaphragm which allows a surface elastic wave to pass therethrough and on which said weight is mounted.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |