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Patent US4339953A successfully refreshed from Google Patents.
US4339953A
Expired / Lapsed
US
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Position sensor
Assignee: Aisin Corp
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Filing: 1980-08-29
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Granted: 1982-07-20
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Expires: 2000-08-29
Abstract
Abstract A position sensor comprising a ferromagnetic member operatively connected to an operation means and movable in response to displacement of the operation means, a magnetically soft member surrounded by an electrical coil secured adjacent to a range of movement of the ferromagnetic member, and a displacement pulse phase conversion unit including a permanent magnet. Voltage pulses are applied to one end of the electrical coil, the other end of which is connected in series with a resistor. A voltage drop across the resistor is detected and a time lag of the resistor voltage, which time lag corresponds to displacement of the operation means, is provided in the form of an analog voltage or a digital code.
Inventors
- 👤 Shinichiro Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:44
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/20; G01B; G01B7/00; G01B7/003
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
134 words
A position sensor for detecting operational displacement of an operation means, comprising: a ferromagnetic member movable in response to displacement of said operation means; permanent magnet means for providing a magnetic field; core means including a magnetically soft material disposed adjacent said ferromagnetic member and said permanent magnet means for forming a magnetic circuit therewith; at least one electrical coil disposed on said core means; detector means for detecting a change of intensity of magnetic flux produced in said core means by the magnetic field of said permanent magnet means in response to a displacement of said strong ferromagnetic member, comprising means for applying a pulse voltage to said at least one coil; and means for measuring the time delay occurring from the application of said pulse voltage until saturation of said core means.
Claim 2
Dependent Claim
134 words
A position sensor for detecting operational displacement of an operation means, comprising: a ferromagnetic member movable in response to displacement of said operation means; permanent magnet means for providing a magnetic field; core means including a magnetically soft material disposed adjacent said ferromagnetic member and said permanent magnet means for forming a magnetic circuit therewith; at least one electrical coil disposed on said core means; detector means for detecting a change of intensity of magnetic flux produced in said core means by the magnetic field of said permanent magnet means in response to a displacement of said strong ferromagnetic member, comprising means for applying a pulse voltage to said at least one coil; and means for measuring the time delay occurring from the application of said pulse voltage until saturation of said core means.
Claim 3
Dependent Claim
21 words
A position sensor according to claim 1, further comprising; non-magnetic connection means for connecting said ferromagnetic member to said operation means.
Claim 4
Dependent Claim
22 words
A position sensor according to claim 1, in which said core means of magnetically soft material consists of: an amorphous magnetic member.
Claim 5
Dependent Claim
18 words
A position sensor according to claim 1, in which said ferromagnetic member consists of: an amorphous magnetic member.
Claim 6
Dependent Claim
33 words
A position sensor according to claim 1, further comprising: said core means of magnetically soft material comprising a pair of magnetically soft members disposed adjacent said permanent magnet means at opposite sides thereof.
Claim 7
Dependent Claim
35 words
A position sensor according to claim 1, further comprising: said permanent magnet means comprising a pair of permanent magnets; and a pair of magnetically soft members disposed in opposing relationship with the respective permanent magnets.
References Cited (Backward Citations)
GB909023A
Cited
US4140971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |