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EP0392020A1
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EP
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Magnetooptical recording apparatus
Assignee: Sony Corp
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Filing: 1989-06-19
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Granted: —
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Expires: 2009-06-19
Abstract
Abstract A magnetooptical recording apparatus according to which light spots are successively formed on a magnetooptical disc (2) at a timing of a predetermined reference clock signal (S ck ), and record data are magnetically recorded onto the disc (2) by applying a predetermined modulation magnetic field (H M ) of which the polarity is inverted depending on the record data in synchronism with the reference clock signals (SC K ), wherein the timing for inverting the polarity of the modulation magnetic field (H M ) in response to the reference clock signals (S CK ) is delayed by a predetermined amount depending upon the characteristics of the disc (2) in order to form a pit (P) at a correct position relative to the timing of the reference clock signal (S CK ). Furthermore, the light beam (LA 1 ) is controlled depending upon the temperature of the disc (2) and/or the scanning position of the light spot, in order to form the pit (P) at a correct position relative to the timing of the reference clock signal (S ck ).
Inventors
- 👤 Tetsu Watanabe
- 👤 Tetsuji Kawashima
- 👤 Goro Fujita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 15:42
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B33/00; G11B33/14; G11B33/1406; G11B33/144; G11B11/105; G11B11/10502; G11B11/10504; G11B11/10508; G11B11/1051; G11B11/10513; G11B11/1053; G11B11/10595; G11B19/00; G11B19/02; G11B19/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
92 words
1) A magneto-optical recording apparatus in which light spots are formed one after another at the timing of a predetermined reference clock signal on a magneto-optical disk, and a predetermined modulating magnetic field is applied which is reversed in polarity as a function of record data in synchronism with the reference clock signals to magnetically record said record data on said magneto-optical disk, characterized in that the timing of polarity reversion of the modulating magnetic field with respect to the reference clock signal is delayed a predetermined amount for a magneto-optical disk.
Claim 2
Dependent Claim
92 words
1) A magneto-optical recording apparatus in which light spots are formed one after another at the timing of a predetermined reference clock signal on a magneto-optical disk, and a predetermined modulating magnetic field is applied which is reversed in polarity as a function of record data in synchronism with the reference clock signals to magnetically record said record data on said magneto-optical disk, characterized in that the timing of polarity reversion of the modulating magnetic field with respect to the reference clock signal is delayed a predetermined amount for a magneto-optical disk.
Claim 3
Dependent Claim
110 words
2) A magneto-optical recording apparatus in which, light spots are formed one after another on a magneto-optical disk at the timing of a predetermined reference clock signal, and a predetermined modulating magnetic field is applied which is reversed in polarity as a function of record data in synchronism with the reference clock signals to magnetically record said record data on said magneto-optical disk, characterized in that at least one of the timing of irradiating the light beam forming said light spots, the light volume of said light beam or the irradiation time is controlled as a function of the temperature of the magneto- optical disk obtained via temperature sensor means.
Claim 4
Dependent Claim
110 words
2) A magneto-optical recording apparatus in which, light spots are formed one after another on a magneto-optical disk at the timing of a predetermined reference clock signal, and a predetermined modulating magnetic field is applied which is reversed in polarity as a function of record data in synchronism with the reference clock signals to magnetically record said record data on said magneto-optical disk, characterized in that at least one of the timing of irradiating the light beam forming said light spots, the light volume of said light beam or the irradiation time is controlled as a function of the temperature of the magneto- optical disk obtained via temperature sensor means.
Claim 5
Dependent Claim
116 words
3) A magneto-optical recording apparatus in which light spots are formed one after another on a magneto-optical disk at the timing of a predetermined reference clock signal, and a predetermined modulating magnetic field is applied which is reversed in polarity as a function of record data in synchronism with the reference clock signals to magnetically record said record data on said magneto-optical disk, characterized in that at least one of the timing of irradiating the light beam forming said light spots, the light volume of said light beam or the irradiation time is controlled as a function of the sweeping position of said light spot on said magneto-optical disk obtained via light spot position detection means.
Claim 6
Dependent Claim
116 words
3) A magneto-optical recording apparatus in which light spots are formed one after another on a magneto-optical disk at the timing of a predetermined reference clock signal, and a predetermined modulating magnetic field is applied which is reversed in polarity as a function of record data in synchronism with the reference clock signals to magnetically record said record data on said magneto-optical disk, characterized in that at least one of the timing of irradiating the light beam forming said light spots, the light volume of said light beam or the irradiation time is controlled as a function of the sweeping position of said light spot on said magneto-optical disk obtained via light spot position detection means.
Claim 7
Dependent Claim
130 words
4) A magneto-optical recording apparatus in which light spots are formed one after another on a magneto-optical disk at the timing of a predetermined reference clock signal, and a predetermined modulating magnetic field is applied which is reversed in polarity as a function of record data in synchronism with the reference clock signals to magnetically record said record data on said magneto-optical disk, characterized in that at least one of the timing of irradiating the light beam forming said light spots, the light volume of said light beam or the irradiation time is controlled as a function of the temperature of the magneto- optical disk obtained via temperature sensor means and of the sweeping position of said light spot on said magneto-optical disk obtained via light spot position detection means.
Claim 8
Dependent Claim
130 words
4) A magneto-optical recording apparatus in which light spots are formed one after another on a magneto-optical disk at the timing of a predetermined reference clock signal, and a predetermined modulating magnetic field is applied which is reversed in polarity as a function of record data in synchronism with the reference clock signals to magnetically record said record data on said magneto-optical disk, characterized in that at least one of the timing of irradiating the light beam forming said light spots, the light volume of said light beam or the irradiation time is controlled as a function of the temperature of the magneto- optical disk obtained via temperature sensor means and of the sweeping position of said light spot on said magneto-optical disk obtained via light spot position detection means.
References Cited (Backward Citations)
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