US5072431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magneto-optical disk recording apparatus
Assignee: Sony Corp
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Filing: 1990-04-10
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Granted: 1991-12-10
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Expires: 2010-04-10
Abstract
Abstract A magneto-optical recording apparatus comprising an optical head shiftable in the diametrical direction of a magneto-optical disk and capable of irradiating a light beam onto the magneto-optical disk, and a magnetic head disposed to be mutually opposite to the optical head with the magneto-optical disk interposed therebetween and capable of applying a magnetic field to the magneto-optical disk while being shifted in the diametrical direction of the magneto-optical disk, wherein the magnetic head is shiftable in the diametrical direction of the magneto-optical disk together with the optical head. The magnetic head consists of an E-shaped core and a coil wound around a center core element thereof, and the E-shaped core is so formed that the sectional length of the center core element in one direction extending toward two side core elements becomes equal to or shorter than the sectional length in another direction orthogonal thereto. The magnetic head is so disposed that the orthogonal direction of its core becomes coincident with the diametrical direction of the magneto-optical disk.
Inventors
- 👤 Takashi Ohmori
- 👤 Hirotoshi Fujisawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:45
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B17/00; G11B17/02; G11B17/04; G11B17/05; G11B17/051; G11B11/105; G11B11/10532; G11B11/10534; G11B11/1055; G11B11/10556; G11B11/10558; G11B33/00; G11B33/02; G11B33/027
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
137 words
A magneto-optical disk recording apparatus comprising: an optical head shiftable in the diametrical direction of a magneto-optical disk for irradiating a light beam onto the magneto-optical disk; a magnetic head disposed to be opposite said optical head with the magneto-optical disk interposed therebetween for applying a magnetic field to the magneto-optical disk, said magnetic head being shifted in the diametrical direction of the magneto-optical disk; and means for shifting said optical head and said magnetic head in said diametrical direction of said disk; wherein said magnetic head consists of an E-shaped core and a coil wound around a center core element thereof, said E-shaped core being so formed that the intensity of the magnetic field generated from said magnetic head changes more gradually in the diametrical direction of the magneto-optical disk than in a direction orthogonal thereto.
Claim 2
Dependent Claim
137 words
A magneto-optical disk recording apparatus comprising: an optical head shiftable in the diametrical direction of a magneto-optical disk for irradiating a light beam onto the magneto-optical disk; a magnetic head disposed to be opposite said optical head with the magneto-optical disk interposed therebetween for applying a magnetic field to the magneto-optical disk, said magnetic head being shifted in the diametrical direction of the magneto-optical disk; and means for shifting said optical head and said magnetic head in said diametrical direction of said disk; wherein said magnetic head consists of an E-shaped core and a coil wound around a center core element thereof, said E-shaped core being so formed that the intensity of the magnetic field generated from said magnetic head changes more gradually in the diametrical direction of the magneto-optical disk than in a direction orthogonal thereto.
Claim 3
Dependent Claim
63 words
A magneto-optical disk recording apparatus according to claim 1, wherein said magnetic head is so formed that a sectional length of said center core element in one direction extending toward two side core elements equals a sectional length in another direction orthgonal thereto, and said magnetic head is so disposed that said orthogonal direction coincides with the diametrical direction of the magneto-optical disk.
Claim 4
Dependent Claim
65 words
A magneto-optical disk recording apparatus according to claim 1, wherein said magnetic head is so formed that a sectional length of said center core element in one direction extending toward two side core elements is shorter than a sectional length in another direction orthogonal thereto, and said magnetic head is so disposed that said orthogonal direction coincides with the diametrical direction of the magneto-optical disk.
Claim 5
Dependent Claim
155 words
A magneto-optical disk recording apparatus comprising: a body equipped with an optical head shiftable in the diametrical direction of a magneto-optical disk for irradiating a light beam onto the magneto-optical disk; a cover hingedly attached to said body; a magnetic head disposed in said cover to be shiftable in the diametrical direction of the magneto-optical disk for applying a magnetic field to the disk; wherein said magnetic head consists of an E-shaped core and a coil wound around a center core element thereof, said E-shaped core being so formed that the intensity of the magnetic field generated from said magnetic head changes more gradually in the diametrical direction of the magneto-optical disk than in a direction orthogonal thereto; means for shifting said optical head and said magnetic head in said diametrical direction of the disk; and lock means for swinging said magnetic head relative to the magneto-optical disk in compliance with movement of the cover.
Claim 6
Dependent Claim
155 words
A magneto-optical disk recording apparatus comprising: a body equipped with an optical head shiftable in the diametrical direction of a magneto-optical disk for irradiating a light beam onto the magneto-optical disk; a cover hingedly attached to said body; a magnetic head disposed in said cover to be shiftable in the diametrical direction of the magneto-optical disk for applying a magnetic field to the disk; wherein said magnetic head consists of an E-shaped core and a coil wound around a center core element thereof, said E-shaped core being so formed that the intensity of the magnetic field generated from said magnetic head changes more gradually in the diametrical direction of the magneto-optical disk than in a direction orthogonal thereto; means for shifting said optical head and said magnetic head in said diametrical direction of the disk; and lock means for swinging said magnetic head relative to the magneto-optical disk in compliance with movement of the cover.
Claim 7
Dependent Claim
65 words
A magneto-optical disk recording apparatus according to claim 4, further comprising: said shifting means comprising optical head support means for supporting said optical head to be shiftable in the diametrical direction of the magneto-optical disk; magnetic head support means for supporting said magnetic head to be shiftable in the diametrical direction of the magneto-optical disk; and means for connecting said optical means to each other.
Claim 8
Dependent Claim
41 words
A magneto-optical disk recording apparatus according to claim 5, wherein said magnetic head support means is so held in said cover as to be shiftable in the diametrical direction of the magneto-optical disk and to be swingable together with said cover.
Claim 9
Dependent Claim
25 words
A magneto-optical disk recording apparatus according to claim 6, further comprising control means for controlling the amount of swing of said magnetic head support means.
Claim 10
Dependent Claim
28 words
A magneto-optical disk recording apparatus according to claim 7, wherein said control means has a mechanism for adjusting the amount of swing of said magnetic head support means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-09 | 1995-06-10 | 1995-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-09 | 1999-06-10 | 1999-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-09 | 2003-06-10 | 2003-12-10 | $7700.00 | Window Closed / Lapsed |