EP0290281A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for giving auxiliary magnetic field
Assignee: Sharp Corp
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Filing: 1988-05-06
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Granted: —
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Expires: 2008-05-06
Abstract
Abstract An apparatus for operating a magneto-optic medium comprises auxiliary-magnetic field apply means (1) for applying an auxiliary magnetic field to the magneto-optic medium (3) when the magneto-optic medium erases or records data, which automatically returns to a neutral position (B) when the power source is switchd off and keys the neutral position (B) until the power source is switched on again.
Inventors
- 👤 Shigenobu Hisasi Minami
- 👤 Shozo Kobayashi
- 👤 Toshihisa Deguchi
- 👤 Yoshiki Nishioka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 10:50
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/1055; G11B11/10556; G11B11/1056
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
69 words
An apparatus for operating a magneto-optic medium, comprising: auxiliary-magnetic field apply means for applying an auxiliary magnetic field to said magneto-optic medium when said magneto-optic medium erases or records data; and neutral-position control means for positioning said medium in a neutral-magnetic position when said auxiliary-magnetic field apply means is switched off, said neutral-position control means maintaining said medium at the neutral-magnetic position until said apply means is switched on.
Claim 2
Independent Claim
69 words
An apparatus for operating a magneto-optic medium, comprising: auxiliary-magnetic field apply means for applying an auxiliary magnetic field to said magneto-optic medium when said magneto-optic medium erases or records data; and neutral-position control means for positioning said medium in a neutral-magnetic position when said auxiliary-magnetic field apply means is switched off, said neutral-position control means maintaining said medium at the neutral-magnetic position until said apply means is switched on.
Claim 3
Dependent Claim
14 words
The apparatus of claim 1, wherein said neutral-position control means comprises a permanent magnet.
Claim 4
Dependent Claim
40 words
Magneto-optic recording and/or reading apparatus having a permanent magnet movable between a first position in which it applies an auxiliary magnetic field to a record medium and a second position in which substantially no field is applied to the medium.
Claim 5
Dependent Claim
40 words
Magneto-optic recording and/or reading apparatus having a permanent magnet movable between a first position in which it applies an auxiliary magnetic field to a record medium and a second position in which substantially no field is applied to the medium.
Claim 6
Dependent Claim
19 words
Apparatus as claimed in claim 3, including a further magnet for moving said permanent magnet to its second position.
References Cited (Backward Citations)
No citation records indexed.
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