Dynamic magnetic information storage or retrieval – Head mounting – For moving head into/out of transducing position
Patent
1998-06-08
2000-07-11
Letscher, George J.
Dynamic magnetic information storage or retrieval
Head mounting
For moving head into/out of transducing position
369 13, G11B 554, G11B 1110
Patent
active
060882034
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates a magnetic head vertical movement device for a magneto-optical recording and/or reproducing apparatus using magneto-optical disc as recording medium, and more particularly to a magnetic head vertical movement device capable of moving the magnetic head so that it is placed (located) at a position caused to be further elevated as compared to the case where it is placed (located) at the non-recording position of information signals with respect to the recording medium.
BACKGROUND ART
Hitherto, there have been proposed magneto-optical recording/reproducing apparatuses adapted to selectively use, as a recording medium for information signals, the magneto-optical disc capable of carrying out overwrite recording of information signals and the reproduction only (type) optical disc.
The magneto-optical disc or the optical disc used for a magneto-optical recording/reproducing apparatus as described above is accommodated within the disc cartridge in order to prevent damage of at least the signal recording surface and/or attachment of dust thereto, and is loaded into the magneto-optical recording/reproducing apparatus in the state where it remains to be accommodated within the disc cartridge.
The magneto-optical recording/reproducing apparatus (unit) using the disc cartridge comprises holder for holding the disc cartridge, and is adapted so that this holder is rotated from the rising position for carrying out insertion or ejection of the disc cartridge toward the falling position side for carrying out recording and/or reproduction with respect to the magneto-optical disc within the disc cartridge, whereby the disc cartridge inserted and held within the holder is loaded into the recording/reproduction unit.
The recording/reproduction unit for carrying out recording and/or reproduction with respect to the magneto-optical disc within the disc cartridge comprises a magnetic head disposed above the holder and adapted to be rotated following rotation of the holder, and an optical head disposed at the position opposite to this magnetic head. Further, at the recording/reproduction unit, there is provided a cartridge loading section within which disc cartridge held within the holder is loaded after undergone positioning, and there is provided a disc rotational operation mechanism for allowing the magneto-optical disc or the optical disc accommodated within the disc cartridge loaded at the cartridge loading portion to undergo rotational operation.
In order to carry out recording of information signals such as music signal, etc. by the magneto-optical recording/reproducing unit constituted as described above, the disc cartridge within which the magneto-optical disc which permits overwrite recording of information signals is accommodated is held into the holder to rotate this holder toward the falling position side where recording and/or reproduction of information signals are carried out with respect to the magneto-optical disc to allow the disc cartridge to undergo loading with respect to the cartridge loading portion. When the disc cartridge is loaded with respect to the cartridge loading portion, the magneto-optical disc accommodated within the disc cartridge is clamped with respect to the disc rotational operation mechanism. At this stage, the disc rotational operation mechanism is driven to allow the magneto-optical disc to undergo rotational operation, and to allow the magnetic head and the optical head to undergo movement operation in the radial direction of the magneto-optical disc in a manner synchronous with each other. Then, light beams emitted from the optical head are irradiated onto the magneto-optical disc caused to experience rotational operation to heat the portion where light beams have been irradiated so that its temperature becomes equal to the Curie temperature or more, and to apply, to the heated portion, external magnetic field which has been magnetically modulated in accordance with information signal to be recorded from the magnetic head. Thus, recording of desi
REFERENCES:
patent: 5299185 (1994-03-01), Sakurai et al.
patent: 5557589 (1996-09-01), Mukawa et al.
patent: 5648943 (1997-07-01), Omi et al.
Kurita Kazuhito
Kusunoki Toshihiro
Nakamura Tadami
Toda Kiyoshi
Letscher George J.
Sony Corporation
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