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US4757410A
Expired / Lapsed
US
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Magnetoresistance effect for short and long wavelength recordings
Assignee: Sony Corp
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Filing: 1985-10-30
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Granted: 1988-07-12
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Expires: 2005-10-30
Abstract
Abstract A multi-channel magnetoresistance effect type magnetic head has a short wavelength region magnetic head element and a relatively longer wavelength region magnetic head element. The two head elements are provided on a magnetic substrate with each having a magnetic circuit containing a magnetic gap facing a surface adjacent to and across from a magnetic recording medium. Each magnetic circuit has a discontinuity portion with a bridging magnetoresistance effect sensing element to magnetically connect the discontinuity portion. The longer wavelength magnetic head discontinuity portion is spaced at a greater distance from the adjacent surface than is the discontinuity portion of the shorter wavelength magnetic head element.
Inventors
- 👤 Satoru Seko
- 👤 Yutaka Soda
- 👤 Hiroyuki Uchida
- 👤 Tetsuo Sekiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:01
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/3906; G11B5/3916; G11B5/3919; G11B5/3922; G11B5/3925; G11B5/3967; G11B5/397; G11B5/3977; G11B5/48; G11B5/488
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
257 words
A multi-channel magnetoresistance effect type magnetic head assembly for use with a magnetic recording medium having first and second recording tracks, the first track being recorded in a region of a first wavelength and the second track being recorded in a region of a second wavelength, comprising: a first reproduction magnetic head element operable in a region of said first wavelength and positioned for engagement at the first recording track of the magnetic recording medium so as to produce a first information signal; a second reproduction magnetic head element operable in a region of said second wavelength wherein the second wavelength is longer than the first wavelength and positioned for engagement at the second recording track of the magnetic recording medium so as to produce a second information signal different than the first signal said first signal and said second signal being adapted to be used independently; the first and second head elements being arranged on a magnetic substrate; each of the head element having a magnetic circuit with a magnetic gap at a surface adjacent to and facing a location where the magnetic recording medium is positioned; each of said magnetic circuits being provided with a discontinuity portion having a magnetoresistance effect sensing element thereat so as to connect the discontinuity portion magnetically; and the magnetoresistance effect sensing element of the second magnetic head element of the second wavelength being positioned rearwardly with respect to the magnetoresistance effect sensing element of the first magnetic head element of the first wavelength region relative to the adjacent surface.
Claim 2
Dependent Claim
257 words
A multi-channel magnetoresistance effect type magnetic head assembly for use with a magnetic recording medium having first and second recording tracks, the first track being recorded in a region of a first wavelength and the second track being recorded in a region of a second wavelength, comprising: a first reproduction magnetic head element operable in a region of said first wavelength and positioned for engagement at the first recording track of the magnetic recording medium so as to produce a first information signal; a second reproduction magnetic head element operable in a region of said second wavelength wherein the second wavelength is longer than the first wavelength and positioned for engagement at the second recording track of the magnetic recording medium so as to produce a second information signal different than the first signal said first signal and said second signal being adapted to be used independently; the first and second head elements being arranged on a magnetic substrate; each of the head element having a magnetic circuit with a magnetic gap at a surface adjacent to and facing a location where the magnetic recording medium is positioned; each of said magnetic circuits being provided with a discontinuity portion having a magnetoresistance effect sensing element thereat so as to connect the discontinuity portion magnetically; and the magnetoresistance effect sensing element of the second magnetic head element of the second wavelength being positioned rearwardly with respect to the magnetoresistance effect sensing element of the first magnetic head element of the first wavelength region relative to the adjacent surface.
Claim 3
Dependent Claim
265 words
A multi-channel magnetoresistance effect type magnetic head assembly for use with a magnetic recording medium having first and second recording tracks, the first track being recorded in a region of a first wavelength and the second track being recorded in a region of a second wavelength, comprising: a first reproduction magnetic head element operable in said first wavelength region and positioned for engagement at the first recording track of the magnetic recording medium so as to produce a first information signal; a second reproduction magnetic head element operable in said second wavelength region which is of a relatively longer wavelength as compared to the wavelength of the first region and positioned for engagement at the second recording track of the magnetic recording medium so as to produce a second information signal different than the first signal; the first and second head elements being arranged on a magnetic substrate; each of the head elements having a magnetic circuit with a magnetic gap at a surface adjacent to and across from a location where the magnetic recording medium is positioned; each of the magnetic circuits being provided with a discontinuity portion comprising respective end faces of a front core and back core so as to form a gap therebetween, and wherein a magnetoresistance effect sensing element is positioned beneath the front and back core end faces and beneath the gap so as to magnetically connect the discontinuity portion gap; and the second head element discontinuity portion gap being spaced at a greater distance from said adjacent surface than the discontinuity portion gap of the first head element.
Claim 4
Dependent Claim
265 words
A multi-channel magnetoresistance effect type magnetic head assembly for use with a magnetic recording medium having first and second recording tracks, the first track being recorded in a region of a first wavelength and the second track being recorded in a region of a second wavelength, comprising: a first reproduction magnetic head element operable in said first wavelength region and positioned for engagement at the first recording track of the magnetic recording medium so as to produce a first information signal; a second reproduction magnetic head element operable in said second wavelength region which is of a relatively longer wavelength as compared to the wavelength of the first region and positioned for engagement at the second recording track of the magnetic recording medium so as to produce a second information signal different than the first signal; the first and second head elements being arranged on a magnetic substrate; each of the head elements having a magnetic circuit with a magnetic gap at a surface adjacent to and across from a location where the magnetic recording medium is positioned; each of the magnetic circuits being provided with a discontinuity portion comprising respective end faces of a front core and back core so as to form a gap therebetween, and wherein a magnetoresistance effect sensing element is positioned beneath the front and back core end faces and beneath the gap so as to magnetically connect the discontinuity portion gap; and the second head element discontinuity portion gap being spaced at a greater distance from said adjacent surface than the discontinuity portion gap of the first head element.
Claim 5
Dependent Claim
95 words
An assembly according to claim 2 wherein a strip-shaped bias conductor runs underneath the magnetoresistance effect sensing elements of the first and second head elements and is common to both, and wherein a second portion of the bias conductor underlying the second head element sensing element is offset relative to a first portion of the bias conductor of the first head element sensing element, said offset of the second head element providing the second portion of the bias conductor at a greater distance form said adjacent surface than the first portion of the bias conductor.
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) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |