Patent EP0414517A2 successfully refreshed from Google Patents.
EP0414517A2
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EP
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Optical disc recording apparatus and method
Assignee: Sony Corp
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Filing: 1990-08-22
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Granted: —
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Expires: 2010-08-22
Abstract
Abstract An optical disc recording apparatus for recording information signals on an optical disc having an optical recording medium with a larger thermal time constant, such as an organic dyestuff base material, by irradiating the disc with a recording light modulated by signals produced by eight fourteen modulation of information signals, is disclosed. The apparatus includes a recording pulse forming unit for forming recording pulses from the eight fourteen modulated signals, which recording pulses are of pulse widths shorter than the eight fourteen modulated signals by a pulse width corresponding to the elongation from the regular length of a pit formed on the recording medium on the basis of the eight fourteen modulated signals, and an optical head supplied with the recording pulses formed by the pulse forming unit for producing the light which has been eight pulse width modulated by the recording pulses.
Inventors
- 👤 Hiroshi Ogawa
- 👤 Shinichiro Iimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 14:34
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24085; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426; G11B2020/1461
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
An optical disc recording apparatus for recording information data by irradiating a recording medium of an optical disc with light modulated in accordance with baseband signals, the recorded signals being subject to elongation due to a recording time constant characteristic of the recording medium, said apparatus comprising: recording pulse forming means for forming recording pulses from said baseband signals, said recording pulses having pulse widths shorter than said baseband signals by a pulse width corresponding to the elongation from the regular length of a recorded signal formed on the recording medium on the basis of said baseband signals, and an optical head supplied with the recording pulses formed by said pulse forming means and producing the recording light which has been light pulse width modulated by said recording pulses.
Claim 2
Dependent Claim
129 words
An optical disc recording apparatus for recording information data by irradiating a recording medium of an optical disc with light modulated in accordance with baseband signals, the recorded signals being subject to elongation due to a recording time constant characteristic of the recording medium, said apparatus comprising: recording pulse forming means for forming recording pulses from said baseband signals, said recording pulses having pulse widths shorter than said baseband signals by a pulse width corresponding to the elongation from the regular length of a recorded signal formed on the recording medium on the basis of said baseband signals, and an optical head supplied with the recording pulses formed by said pulse forming means and producing the recording light which has been light pulse width modulated by said recording pulses.
Claim 3
Dependent Claim
62 words
The optical disc recording apparatus according to claim 1 wherein said recording pulse forming means is operative to generate signals elongated by a predetermined time duration as compared with the pulse width which is shorter by a clock pulse width corresponding to said elongation than the pulse width of the recording pulse corresponding to the minimum transition distance of the baseband signals.
Claim 4
Dependent Claim
59 words
The optical disc recording apparatus according to claim 2 wherein the pulse width of said recording pulse corresponding to said minimum transition distance is longer than the pulse width shorter by a pulse width corresponding to said elongation from the regular length associated with said minimum transition distance and shorter than the pulse width corresponding to said regular length.
Claim 5
Dependent Claim
53 words
The optical disc recording apparatus according to any one of claims 1 to 3 wherein said recording pulse forming means is operative to generate recording pulses having a pulse width shorter by a pulse width corresponding to the elongation from the regular length of the baseband signals longer than said minimum transition distance.
Claim 6
Dependent Claim
51 words
The optical disc recording apparatus according to claim 4 wherein said recording pulse forming means is operative to generate recording pulses having a pulse width shorter by a pulse width corresponding to one clock bit of the baseband signals which are longer than said minimum transition distance of the baseband signals
Claim 7
Dependent Claim
126 words
An optical disc recording apparatus for recording information data by irradiating a recording medium of an optical disc with light modulated in accordance with baseband signals, the recorded signals being subject to elongation due to a recording time constant characteristic of the recording medium, said apparatus comprising: recording pulse forming means for forming recording pulses from said baseband signals, said recording pulses having pulse widths shorter than said baseband signals by a pulse width corresponding to the elongation from the regular length of a pit formed on the recording medium on the basis of said baseband signals, and in which said baseband signals are recorded by a recording light which has been light-intensity pulse width modulated by recording pulses formed by said recording pulse forming means.
Claim 8
Dependent Claim
126 words
An optical disc recording apparatus for recording information data by irradiating a recording medium of an optical disc with light modulated in accordance with baseband signals, the recorded signals being subject to elongation due to a recording time constant characteristic of the recording medium, said apparatus comprising: recording pulse forming means for forming recording pulses from said baseband signals, said recording pulses having pulse widths shorter than said baseband signals by a pulse width corresponding to the elongation from the regular length of a pit formed on the recording medium on the basis of said baseband signals, and in which said baseband signals are recorded by a recording light which has been light-intensity pulse width modulated by recording pulses formed by said recording pulse forming means.
Claim 9
Dependent Claim
55 words
The optical disc recording apparatus according to claim 6 wherein said recording pulse forming means generate signals elongated by a predetermined time duration from the pulse width shorter by a clock pulse width corresponding to said elongation than the pulse width of the recording pulse corresponding to the minimum transition distance of the baseband signals.
Claim 10
Dependent Claim
59 words
The optical disc recording apparatus according to claim 7 wherein the pulse width of said recording pulse corresponding to said minimum transition distance is longer than the pulse width shorter by a pulse width corresponding to said elongation from the regular length associated with said minimum transition distance and longer than the pulse width corresponding to said regular length.
Claim 11
Dependent Claim
50 words
The optical disc recording apparatus according to any one of claims 6 to 8 wherein said recording pulse forming means generate recording pulses having a pulse width shorter by a pulse width corresponding to the elongation from the regular length of the baseband signals longer than said minimum transition distance.
Claim 12
Dependent Claim
48 words
The optical disc recording apparatus according to claim 9 wherein said recording pulse forming means generate recording pulses having a pulse width shorter by a pulse width corresponding to one clock bit of the baseband signals which are longer than said minimum transition distance of the baseband signals.
References Cited (Backward Citations)
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