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1. (WO1991009400) OPTICAL RECORDING APPARATUS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/009400 International Application No.: PCT/JP1990/001641
Publication Date: 27.06.1991 International Filing Date: 17.12.1990
IPC:
G11B 11/105 (2006.01) ,G11B 20/10 (2006.01) ,G11B 7/0045 (2006.01) ,G11B 7/125 (2012.01)
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
11
Recording on, or reproducing from, the same record carrier wherein for these two operations the methods or means are covered by different main groups of groups G11B3/-G11B7/212; Record carriers therefor
10
using recording by magnetisation or demagnetisation
105
using a beam of light or a magnetic field for recording and a beam of light for reproducing, e.g. light-induced thermo-magnetic recording, Kerr effect reproducing
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
20
Signal processing not specific to the method of recording or reproducing; Circuits therefor
10
Digital recording or reproducing
[IPC code unknown for G11B 7/045]
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
12
Heads, e.g. forming of the optical beam spot or modulation of the optical beam
125
Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
Applicants:
SONY CORPORATION [JP/JP]; 7-35, Kitashinagawa 6-chome Shinagawa-ku Tokyo 141, JP (AllExceptUS)
UDAGAWA, Toshiki [JP/JP]; JP (UsOnly)
YOSHIMURA, Shunji [JP/JP]; JP (UsOnly)
OHTA, Masumi [JP/JP]; JP (UsOnly)
Inventors:
UDAGAWA, Toshiki; JP
YOSHIMURA, Shunji; JP
OHTA, Masumi; JP
Agent:
MATSUKUMA, Hidemori; Shinjuku Building 8-1, Nishishinjuku 1-chome Shinjuku-ku Tokyo 160, JP
Priority Data:
1/33083820.12.1989JP
Title (EN) OPTICAL RECORDING APPARATUS
(FR) APPAREIL D'ENREGISTREMENT OPTIQUE
Abstract:
(EN) An optical recording apparatus for recording pulse signals onto a recording medium using a laser beam. A pattern detector (31) is provided to detect a pattern of recording signal pulses. If the pulse spacing of the signal is shorter than a predetermined value, the amplitude of the subsequent signal pulses is decreased by a control signal from an amplitude limiting memory (33) so as to reduce the irridiation energy of the laser pulse. This offsets the influences of remaining heat of the recording medium due to the laser pulse corresponding to the preceding signal pulse and makes it possible to record accurately the pulse signals in a high density.
(FR) Appareil d'enregistrement optique servant à enregistrer des signaux impulsionnels sur un support d'enregistrement à l'aide d'un faisceau laser de la manière représentée par la figure 4. Un détecteur de configuration (31) sert à détecter une configuration de signaux impulsionnels d'enregistrement. Si l'espacement des impulsions du signal est inférieur à une valeur prédéterminée, un signal de commande provenant d'une mémoire d'écrêtage (33) réduit l'amplitude des impulsions suivantes afin de réduire l'énergie d'irradiation de l'impulsion laser. Ceci compense l'influence de la chaleur restante du support d'enregistrement, laquelle chaleur est due à l'impulsion laser qui correspond à l'impulsion précédente, et rend possible un enregistrement précis et à densité élevée des signaux impulsionnels.
Designated States: JP, KR, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)
Also published as:
EP0458975JP3028605KR1019920701949