EP0189135A2
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EP
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Recording method and device of optical recording medium
Assignee: Hitachi Ltd
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Filing: 1986-01-17
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Granted: —
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Expires: 2006-01-17
Abstract
Abstract The present invention relates to the method and the device for an optical recording disk, on which the wobbled pre-pitsare recorded by projecting the laser beam modulated by the pre-pit recording signal. This invention comprises the step for dividing the modulating signal source output waveforms into the three signal waveforms having signal waveforms different in time, the step for frequency/modulating each of three signals divided above by the signal waves having different carrier frequency according to each of said plural signals, the step for modulating the said optical beam by the signal outputs which have been frequency/modulated in the preceding process, the step for pre-wobbling said pre-pits by the laser beam which have been modulated in the prior process.
Inventors
- 👤 Seiji Yonezawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 06:58
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/125; G11B7/128; G11B7/004; G11B7/0045; G11B7/08; G11B7/09; G11B7/0938; G11B7/24; G11B7/2407; G11B7/24085
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
112 words
A recording method for an optical recording medium on which the pre-pit is recorded by projecting the optical beam which is modulated by the pre-pit recording signal, which comprises; the step for dividing the modulating signal source output waveforms into the.plural signal waveforms having signal waveforms different in time, the step for frequency/modulating each of the plural signals divided above by the signal waves having different carrier frequency according to each of said plural signals, the step for modulating said optical beam by the signal outputs which have been frequency/modulated in the preceding process, the step for pre-wobbling said pre-pits by the optical beam which have been modulated in the prior process.
Claim 2
Dependent Claim
112 words
A recording method for an optical recording medium on which the pre-pit is recorded by projecting the optical beam which is modulated by the pre-pit recording signal, which comprises; the step for dividing the modulating signal source output waveforms into the.plural signal waveforms having signal waveforms different in time, the step for frequency/modulating each of the plural signals divided above by the signal waves having different carrier frequency according to each of said plural signals, the step for modulating said optical beam by the signal outputs which have been frequency/modulated in the preceding process, the step for pre-wobbling said pre-pits by the optical beam which have been modulated in the prior process.
Claim 3
Dependent Claim
25 words
A recording method for an optical recording medium according to claim 1, wherein said step for dividing includes dividing three different signal waveforms in time.
Claim 4
Dependent Claim
45 words
A recording method for an optical recording medium according to claim 1, wherein said step for frequency modulating is characterized by using the ultrasonic signal waves different in carrier frequency, and said step for modulating the optical beam is characterized by using the acoustic modulator.
Claim 5
Dependent Claim
31 words
A recording method for an optical recording medium according to claim 1, wherein said step for modulating the optical.beam includes the modulator using an adding signal output which has been frequency/modulated.
Claim 6
Dependent Claim
21 words
A recording method for an optical recording medium according to claim 1, wherein said optical recording medium is the optical disk.
Claim 7
Dependent Claim
101 words
A recording device of an optical recording medium comprising; a modulating signal source, means for dividing said modulating signal source output waveform into the plural signal waveforms having the signal waveforms different in time, a modulator driver which is structured so as to frequen- cy/modulate each of said plural signals divided in the previous means by the acoustic signal waves different in carrier frequency according to said plural signals, an acoustic modulator for modulating said optical beam by the signal outputs of said modualtor driver, and a means for pre-wobbling said pre-pits by the optical beam modulated by said acoustic modualtor.
Claim 8
Dependent Claim
101 words
A recording device of an optical recording medium comprising; a modulating signal source, means for dividing said modulating signal source output waveform into the plural signal waveforms having the signal waveforms different in time, a modulator driver which is structured so as to frequen- cy/modulate each of said plural signals divided in the previous means by the acoustic signal waves different in carrier frequency according to said plural signals, an acoustic modulator for modulating said optical beam by the signal outputs of said modualtor driver, and a means for pre-wobbling said pre-pits by the optical beam modulated by said acoustic modualtor.
Claim 9
Dependent Claim
23 words
A recording device of an optical recording medium according to claim 6, wherein said plural signal waveforms are composed of three signal waveforms.
Claim 10
Dependent Claim
39 words
A recording device of an optical recording medium according to claim 6, wherein said modulator driver includes a means for adding said plural signals obtained by said driver so as to modulate said optical beam by said added signal.
Claim 11
Dependent Claim
27 words
A recording device of an optical recording medium according to calim 6, wherein said modulator driver consists of plural modulator drivers having different carrier frequency each other.
Claim 12
Dependent Claim
27 words
A recording device of an optical recording medium according to calim 6, wherein said modulator driver consists of plural modulator drivers having different carrier frequency each other.
Claim 13
Dependent Claim
31 words
A recording device of an optical recording medium according to claim 6, wherein said recording device includes an optical system for converting the said acous-. tic modulator into a parallel beam.
References Cited (Backward Citations)
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