Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1997-07-09
2000-05-23
Korzuch, William R.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
G11B 554
Patent
active
060672072
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a magnetic head device used in a recording and/or reproducing apparatus using a disc-shaped recording medium such as a magneto-optical disc, etc. as a recording medium, and a recording and/or reproducing apparatus for a disc-shaped recording medium using such a head device.
BACKGROUND ART
Hitherto, there have been used magneto-optical discs capable of recording and/or reproducing, by using light beams and the external magnetic field, musical signals or information signals such as data, etc. processed in the computer.
Such magneto-optical discs are adapted so that recording of information signals is carried out at an extremely high density. For this reason, in the magneto-optical discs, errors in the recording and/or reproduction of information signals are caused by slight attachment of dust, or damage or impairment with respect to the signal recording area, thus failing to carry out precise recording and/or reproduction of information signals.
In view of the above, the magneto-optical discs are constituted as a disc cartridge in a manner rotatably accommodated within a cartridge body in which a pair of upper and lower halves are butt-joined. Thus, such magneto-optical discs are loaded into the recording and/or reproducing apparatus (hereinafter referred to as recording and/or reproduction unit as occasion may demand) in the state where they remain within the respective cartridge bodies, and are stored in the state where they remain within the respective cartridge bodies.
The magneto-optical disc accommodated within the disc cartridge is adapted so that the disc cartridge is loaded with respect to the cartridge loading portion within the unit body, the magneto-optical disc is loaded with respect to the disc rotational operation mechanism disposed within the unit body, and is caused to undergo rotational operation by the disc rotational operation mechanism. By irradiating light beams emitted from the optical pick-up unit onto the signal recording portion of the magneto-optical disc placed in the state where it has been caused to undergo rotational operation by the disc rotational operation mechanism, and applying an external magnetic field magnetically modulated in accordance with a desired information signal to be recorded from the magnetic head device, recording of the desired information signal is carried out.
On the other hand, by irradiating light beams emitted from the optical pick-up unit onto the signal recording portion of the magneto-optical disc placed in the state where it has been caused to undergo rotational operation by the disc rotational operation mechanism, and detecting return light reflected from the magneto-optical disc by means of a photo-detector provided at the optical pick-up unit, reading operation of information signals recorded on the magneto-optical disc is carried out.
As stated above, in the recording/reproduction unit using the magneto-optical disc as a recording medium and adapted to have the ability to record/reproduce information signals, the magnetic head device for applying an external magnetic field magnetically modulated in accordance with an information signal to be recorded onto the magneto-optical disc is used.
As a magnetic head device used in the recording/reproduction unit of this kind, a magnetic head device constituted as shown in FIGS. 1 and 2 is used.
This magnetic head device 152 is attached through a connection plate connected to an optical pick-up unit supported on the chassis where the mechanical parts such as the disc rotational operation mechanism, etc. are disposed so that it can be moved. As the result of the fact that the magnetic head device 152 is connected to the optical pick-up unit through the connection plate, it is caused to undergo movement operation in the radial direction of a magneto-optical disc 150 caused to undergo rotational operation by the disc rotational operation mechanism in synchronism with the optical pick-up unit.
The magnetic head device 152 constituting the recording/reproduction m
REFERENCES:
patent: 5572497 (1996-11-01), Kim et al.
patent: 5590098 (1996-12-01), Eom
patent: 5677897 (1997-10-01), Anada et al.
patent: 5682280 (1997-10-01), Takahashi et al.
patent: 5684777 (1997-11-01), Fukuyama et al.
Korzuch William R.
Sony Corporation
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