US4520409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal and magnetic recording head
Assignee: Fujifilm Business Innovation Corp
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Filing: 1982-07-08
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Granted: 1985-05-28
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Expires: 2002-07-08
Abstract
Abstract A combination thermal and magnetic recording head is advantageously designed such that the heat generating resistor elements forming the thermal device are incorporated with the magnetic head device. Specifically, the thermal head may be incorporated in the air gap of the magnetic device.
Inventors
- 👤 Toshifumi Kimoto
- 👤 Teruhiko Itami
- 👤 Nobuo Nishimura
- 👤 Koichi Saitoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:22
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/385; B41J2/43; G; G11; G11B; G11B5/00; G11B5/127; G11B2005/0002; G11B2005/0005; G11B2005/0021; G11B5/29; G11B5/48; G11B5/49; G11B5/4969; G11B5/4984
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
101 words
A magnetic recording head, comprising: a high permeability element having a relatively low magnetic transformation point; a non-magnetic element in the form of a layer formed on said high permeability element, said non-magnetic element being in close contact with a magnetic recording medium; and heat generating means divided for selectively applying a voltage to said high permeability element to thereby heat the latter, said high permeability element, non-magnetic element and heat generating means being provided in an air gap formed in a magnetic head core; said heat generating means comprising an array of selectively energizable resistors collectively forming a thermal head.
Claim 2
Dependent Claim
101 words
A magnetic recording head, comprising: a high permeability element having a relatively low magnetic transformation point; a non-magnetic element in the form of a layer formed on said high permeability element, said non-magnetic element being in close contact with a magnetic recording medium; and heat generating means divided for selectively applying a voltage to said high permeability element to thereby heat the latter, said high permeability element, non-magnetic element and heat generating means being provided in an air gap formed in a magnetic head core; said heat generating means comprising an array of selectively energizable resistors collectively forming a thermal head.
Claim 3
Dependent Claim
30 words
A recording head as claimed in claim 1, said heat-generating means selectively generating a temperature greater than a Curie point of said high permeability element, to effect selective demagnetization thereof.
Claim 4
Dependent Claim
25 words
A recording head as claimed in claim 1, said non magnetic element comprising head insulating means for preventing thermal deformation of a magnetic recording medium.
Claim 5
Dependent Claim
77 words
In a magnetic recording head for forming a magnetic latent image on a magnetic recording medium, the imporvement comprising heat-generating resistors formed in or proximate an air gap of a bias magnetic field applying head, said heat-generating resistors being caused to generate heat according to image signals applied thereto to form a thermal recording head in combination with said magnetic head; said heat generating means comprising an array of selectively energizable resistors collectively forming a thermal head.
Claim 6
Dependent Claim
77 words
In a magnetic recording head for forming a magnetic latent image on a magnetic recording medium, the imporvement comprising heat-generating resistors formed in or proximate an air gap of a bias magnetic field applying head, said heat-generating resistors being caused to generate heat according to image signals applied thereto to form a thermal recording head in combination with said magnetic head; said heat generating means comprising an array of selectively energizable resistors collectively forming a thermal head.
Claim 7
Dependent Claim
15 words
A recording head as claimed in claim 4, said heat-generating resistors filling said air gap.
Claim 8
Dependent Claim
26 words
A recording head as claimed in claim 4, said heat-generating resistors being coated with a glass layer on a side thereof for contacting a recording medium.
Claim 9
Dependent Claim
32 words
A recording head as claimed in claims 4 or 5, said heat generating resistors being selectively operated to generate heat at a temperature approximating a Curie temperature of a magnetic recording medium.
Claim 10
Dependent Claim
22 words
A recording head as claimed in claim 4, said heat-generating resistors being formed on a side of said magnetic field applying head.
Claim 11
Dependent Claim
69 words
A thermal and magnetic writing recording head, comprising; two bias magnetic field generating sections, each comprising a magnetizable plate and a winding provided on said magnetizable plate, said two bias magnetic field generating sections being spaced from each other; and a plurality of heat generating resistors provided between said two bias magnetic field generating sections; said two magnetic field generating sections and said heat generating resistors being substantially coplanar.
Claim 12
Dependent Claim
69 words
A thermal and magnetic writing recording head, comprising; two bias magnetic field generating sections, each comprising a magnetizable plate and a winding provided on said magnetizable plate, said two bias magnetic field generating sections being spaced from each other; and a plurality of heat generating resistors provided between said two bias magnetic field generating sections; said two magnetic field generating sections and said heat generating resistors being substantially coplanar.
Claim 13
Dependent Claim
25 words
A recording head as claimed in claim 9, said bias magnetic field generating sections and said heat generating resistors being covered with a wear-resisting layer.
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) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |