Patent US3473111A successfully refreshed from Google Patents.
EP0213623A2
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EP
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Optical disc recording and reproducing apparatus
Assignee: Sharp Corp
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Filing: 1986-08-30
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Granted: —
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Expires: 2006-08-30
Abstract
Abstract An optical disc apparatus provided with a record correcting system for controlling the variation in the record bit length. The record correcting system may be controlled not only while the power supply is put to work, but also during the unoccupied time when the recording, reproducing, easing operations to the information record region are not required from the upper apparatus. Also, the controlling operation may be performed so that the value of the record correction may be renewed at each of the proper time intervals. The repetition of the trial at the proper interval allows the time lapse after the apparatus power-supply is put to work and the characteristic variation between the respective discs during the disc exchange to be coped with.
Inventors
- 👤 Shigemi Maeda
- 👤 Toshihisa Daiyahaisu Gakuenmae C-722 Deguchi
- 👤 Takeshi Yamaguchi
- 👤 Shozou Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 13:38
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/125; G11B7/126; G11B11/00; G11B11/10; G11B11/105; G11B11/10502; G11B11/10504; G11B11/10506; G11B11/10515; G11B11/1053; G11B11/10595; G11B11/10597; G11B27/00; G11B27/36; G11B7/004; G11B7/005
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
107 words
An optical disc apparatus comprising a laser beam generating means for recording use which generates the laser beams of optional power, a recording means which generates laser beams of different power sequentially by the laser beam generating means for recording use to apply the laser beams upon the disc to form the record bits, and a laser beam power detecting means which detects the power of said laser beam in a case where the pulse width of the reprcduction signal with respect to said record bits becomes a given length, and the information is recorded on said disc in accordance with the power of said laser beam.
Claim 2
Dependent Claim
107 words
An optical disc apparatus comprising a laser beam generating means for recording use which generates the laser beams of optional power, a recording means which generates laser beams of different power sequentially by the laser beam generating means for recording use to apply the laser beams upon the disc to form the record bits, and a laser beam power detecting means which detects the power of said laser beam in a case where the pulse width of the reprcduction signal with respect to said record bits becomes a given length, and the information is recorded on said disc in accordance with the power of said laser beam.
Claim 3
Dependent Claim
27 words
The cptical disc apparatus in accordance with Claim 1, wherein the signal to be recorded on said disc by said recording means is of a constant frequency.
Claim 4
Dependent Claim
71 words
The optical disc apparatus in accordance with Claim 1, wherein said laser beam power detecting means comprises a signal edge detecting means fo r de tectiong the edge of the rise or the fall of said reproduction signal, a timer means to be started by the signal edge detecting means, and a polarity deciding means for deciding the polarity of said reproduction signal at the time up of the timer means.
Claim 5
Dependent Claim
104 words
An optieal dise apparatus comprising a laser beam generating means which geneates the laser beams es cptional power, a recording means which geneates the laser beams of different pulse width sequentially by laser beam generating means to apply the laser beams upon the disc to form the record bits, and a laser beam pulse-width detecting means which detects the pulse width of said laser beam in a case where the pulse width of the reproduction signal with respect to said record bits becomes a given length, and the information is recorded on said disc in accordance with the pulse width of said laser beam.
Claim 6
Dependent Claim
104 words
An optieal dise apparatus comprising a laser beam generating means which geneates the laser beams es cptional power, a recording means which geneates the laser beams of different pulse width sequentially by laser beam generating means to apply the laser beams upon the disc to form the record bits, and a laser beam pulse-width detecting means which detects the pulse width of said laser beam in a case where the pulse width of the reproduction signal with respect to said record bits becomes a given length, and the information is recorded on said disc in accordance with the pulse width of said laser beam.
Claim 7
Dependent Claim
24 words
The optical disc apparatus in accordance with Claim 4, wherein the signal said recording means records on said disc is of a constant frequency.
Claim 8
Dependent Claim
69 words
The optical disc apparatus in accordance with Claim 4, wherein said laser beam pulse width detecting means comprises a signal edge detecting means for detecting the edge of the rise or the fall of said reproduction signal, a timer means to be started by the signal edge detecting means, a polarity deciding means for deciding the polarity of said reproduction signal at the time up of the timer means.
Claim 9
Dependent Claim
131 words
An eptical disc apparatus comprising, in a dise apparatus for information processing use employing an optical disc medium which can be rewritten, a recording means for recording, on an optical disc medium, a pulse string having the single period, a difference detecting means for obtaining the average difference between the hich level period of the reproduction binary signal of the recorded pulse string and the low level period thereof, a record correcting means for correcting the duty ratio of the pulse string of the information to be recorded in accordance with the difference in said record means, and a controlling . means for controlling the record correction composed of the record by said recording means, the difference detection by said difference detecting means, and the correction by said record correcting means.
Claim 10
Dependent Claim
131 words
An eptical disc apparatus comprising, in a dise apparatus for information processing use employing an optical disc medium which can be rewritten, a recording means for recording, on an optical disc medium, a pulse string having the single period, a difference detecting means for obtaining the average difference between the hich level period of the reproduction binary signal of the recorded pulse string and the low level period thereof, a record correcting means for correcting the duty ratio of the pulse string of the information to be recorded in accordance with the difference in said record means, and a controlling . means for controlling the record correction composed of the record by said recording means, the difference detection by said difference detecting means, and the correction by said record correcting means.
Claim 11
Dependent Claim
33 words
The optical disc apparatus in accordance with Claim 7, wherein in said optical disc apparatus, said control means performs said record correcting operation in the unoccupied time not demanded by the upper apparatus.
Claim 12
Dependent Claim
28 words
The optical disc apparatus in accordance with Claim 7, wherein in the optical disc apparatus, said control means performs said record correcting operation in the proper time interval.
Claim 13
Dependent Claim
28 words
The optical disc apparatus in accordance with Claim 8, _wherein in the optical disc apparatus, said control means performs said record correcting operation in the proper time interval.
References Cited (Backward Citations)
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