US4954803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic-resistor sensor and a magnetic encoder using such a sensor
Assignee: Yamaha Corp
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Filing: 1989-03-15
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Granted: 1990-09-04
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Expires: 2009-03-15
Abstract
Abstract A magnetic-resistor sensor is provided with two or more comb-like patterns of different pitches formed on a single base plate and each comb-like pattern is adapted for use in combination with a magnetic scale of a corresponding information pitch so that one magnetic-resistor sensor could span magnetic scales of different information pitches. Such a universal magnetic-resistor sensor is used for a magnetic encoder having a magnetic scale in which a magnetic information pattern and a reference position pattern are formed in the same single track, thereby conserving space on the magnetic scale.
Inventors
- 👤 Kenzaburou Iijima
- 👤 Yoshinori Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:56
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/142; G01D5/145; H; H10; H10N; H10N50/00; H10N50/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
80 words
An improved magnetic-resistor sensor, comprising: a base; and a plurality of juxtaposed comb-like patterns formed on said base plate; each said comb-like pattern including a plurality of juxtaposed sensor sections spaced from each other by a distance fixed depending on the pitch of a respective magnetic information pattern stored on a magnetic scale, usable in combination with said resistor sensor and a plurality of connector portions intervening between said sensor sections; and said distance being different from pattern to pattern.
Claim 2
Dependent Claim
80 words
An improved magnetic-resistor sensor, comprising: a base; and a plurality of juxtaposed comb-like patterns formed on said base plate; each said comb-like pattern including a plurality of juxtaposed sensor sections spaced from each other by a distance fixed depending on the pitch of a respective magnetic information pattern stored on a magnetic scale, usable in combination with said resistor sensor and a plurality of connector portions intervening between said sensor sections; and said distance being different from pattern to pattern.
Claim 3
Dependent Claim
33 words
An improved magnetic-resistor sensor as claimed in claim 1, in which said comb-like patterns are spaced from each other in the direction of relative displacement between said resistor sensor and said magnetic scale.
Claim 4
Dependent Claim
25 words
An improved magnetic-resistor sensor as claimed in claim 2, in which said sensor sections are spaced from each other in said direction of relative displacement.
Claim 5
Dependent Claim
23 words
An improved magnetic-resistor sensor as claimed in claim 2, in which said sensor sections extend substantially normal to said direction of relative movement.
Claim 6
Dependent Claim
143 words
A magnetic encoder, comprising: a magnetic scale including a magnetic information pattern magnetized along a track on a magnetic recording medium and a magnetic reference position pattern magnetized at selected positions in said track; and a magnetic sensor arranged facing said magnetic scale for sensing relative displacement and including first and second juxtaposed comb-like patterns; said first comb-like pattern including a plurality of juxtaposed sensor sections spaced from each other by a distance fixed depending on the pitch of said magnetic information pattern on said magnetic scale, and a plurality of connector portions intervening between said sensor sections; and said second comb-like pattern including a plurality of juxtaposed sensor sections spaced from each other by a distance fixed depending on the pitch of said magnetic reference position pattern on said magnetic scale, and a plurality of connector portions intervening between said sensor sections.
Claim 7
Dependent Claim
143 words
A magnetic encoder, comprising: a magnetic scale including a magnetic information pattern magnetized along a track on a magnetic recording medium and a magnetic reference position pattern magnetized at selected positions in said track; and a magnetic sensor arranged facing said magnetic scale for sensing relative displacement and including first and second juxtaposed comb-like patterns; said first comb-like pattern including a plurality of juxtaposed sensor sections spaced from each other by a distance fixed depending on the pitch of said magnetic information pattern on said magnetic scale, and a plurality of connector portions intervening between said sensor sections; and said second comb-like pattern including a plurality of juxtaposed sensor sections spaced from each other by a distance fixed depending on the pitch of said magnetic reference position pattern on said magnetic scale, and a plurality of connector portions intervening between said sensor sections.
Claim 8
Dependent Claim
95 words
A magnetic encoder, comprising: a magnetic scale including: (i) a magnetic information pattern magnetized along a track on a magnetic recording medium; and (ii) a magnetic reference position pattern magnetized at selected positions in said track; and magnetic sensor means arranged to face said magnetic scale for sensing relative displacement and including a pair of comb-like patterns each having a plurality of juxtaposed sensor sections spaced from each other by a respective distance that respectively corresponds to the respective pitches of said magnetic scale and of said magnetic reference position pattern on said magnetic scale.
Claim 9
Dependent Claim
95 words
A magnetic encoder, comprising: a magnetic scale including: (i) a magnetic information pattern magnetized along a track on a magnetic recording medium; and (ii) a magnetic reference position pattern magnetized at selected positions in said track; and magnetic sensor means arranged to face said magnetic scale for sensing relative displacement and including a pair of comb-like patterns each having a plurality of juxtaposed sensor sections spaced from each other by a respective distance that respectively corresponds to the respective pitches of said magnetic scale and of said magnetic reference position pattern on said magnetic scale.
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) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |