US5206843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for erasing information recorded on an information recording medium by applying light and a magnetic field over a plurality of recording tracks
Assignee: Toshiba Corp
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Filing: 1991-07-29
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Granted: 1993-04-27
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Expires: 2011-07-29
Abstract
Abstract An information recording medium processing apparatus including a light radiating device that uniformly radiates a light beam on a plurality of recording tracks of an information recording medium and a magnetic field applying unit that applies a magnetic field to a region of the information recording medium irradiated with the light beam, thereby simultaneously erasing information recorded in the plurality of recording tracks.
Inventors
- 👤 Koji Kaburagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:12
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10502; G11B11/10526
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
A processing apparatus for erasing information recorded on an information recording medium having a plurality of recording tracks on which the information is recorded by applying light and a magnetic field, comprising: magnetic field applying means for applying the magnetic field to said plurality of recording tracks of said information recording medium, the magnetic field applying means including a substantially U-shaped member having two extending portions between which the information recording medium is positioned; and light radiating means for radiating the light on at least two tracks of said plurality of recording tracks having the magnetic field applied thereon by said magnetic field applying means, the light radiating means being positioned between the two extending portions of the magnetic field applying means and radiating the light on said at least two tracks simultaneously.
Claim 2
Dependent Claim
133 words
A processing apparatus for erasing information recorded on an information recording medium having a plurality of recording tracks on which the information is recorded by applying light and a magnetic field, comprising: magnetic field applying means for applying the magnetic field to said plurality of recording tracks of said information recording medium, the magnetic field applying means including a substantially U-shaped member having two extending portions between which the information recording medium is positioned; and light radiating means for radiating the light on at least two tracks of said plurality of recording tracks having the magnetic field applied thereon by said magnetic field applying means, the light radiating means being positioned between the two extending portions of the magnetic field applying means and radiating the light on said at least two tracks simultaneously.
Claim 3
Dependent Claim
15 words
The apparatus according to claim 1, further comprising means for rotating said information recording medium.
Claim 4
Dependent Claim
49 words
The apparatus according to claim 2, wherein said light radiating means includes means for radiating the light on all regions of said plurality of recording tracks between a center of rotation of the information recording medium and a circumference of an information recording portion on said information recording medium.
Claim 5
Dependent Claim
25 words
The apparatus according to claim 1, wherein said magnetic field applying means includes a square-pillar-like magnetic core and a coil wound around said magnetic core.
References Cited (Backward Citations)
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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) | 1996-04-26 | 1996-10-26 | 1997-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-26 | 2000-10-26 | 2001-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-26 | 2004-10-26 | 2005-04-27 | $7700.00 | Window Closed / Lapsed |