Patent EP0453161A2 successfully refreshed from Google Patents.
EP0453161A2
Expired / Lapsed
EP
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Optical recording apparatus
Assignee: Seiko Epson Corp
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Filing: 1991-04-10
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Granted: —
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Expires: 2011-04-10
Abstract
Abstract The present invention provides optical recording apparatus having an optical head (101) with a semi-conductor laser as a light source. Data read means (102) generate data read signals obtained by monitoring recorded pits on an optical recording medium, and recording state detection means (103) detect the state of the recorded pits based on the data read signals and co-operate with optical output control means (104) so as to control the optical output of the light source at the time of information recording in dependence upon the state of the recorded pits.
Inventors
- 👤 Takao Miyazawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:39
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/125; G11B7/126; G11B27/00; G11B27/36
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
131 words
Optical recording apparatus having an optical head (101) with a laser as a light source, optical output control means (104) for generating signals for controlling the optical output of the light source for information recording, and optical source drive means (105) for driving the light source according to the output of the optical output control means, characterised by data read means (102) for generating data read signals obtained by monitoring recorded pits in a recording medium, and recording state detection means (103), which detect the state of the recorded pits based on the data read signals and which co-operates with the optical output control means so as to control the optical output of the light source at the time of information recording in dependence upon the state of the recorded pits.
Claim 2
Dependent Claim
42 words
Optical recording apparatus according to claim 1 characterised in that the recording state detection means comprise means for converting the data read signal into a digital signal, and pulse width measurement means (139) for measuring the pulse width of the digital signal.
Claim 3
Dependent Claim
43 words
Optical recording apparatus according to claim 1 characterised in that the recording state detection means comprise means for converting the data read signal into a digital signal, and duty detection means (151 to 163) for monitoring the duty ratio of the digital signal.
Claim 4
Dependent Claim
34 words
Optical recording apparatus according to claim 1 characterised in that the recording state detection means comprise amplitude measurement means (174 to 180, 187 to 195) for measuring the amplitude of the data read signal.
Claim 5
Dependent Claim
27 words
Optical recording apparatus according to any preceding claim characterised in that the optical output control means are arranged to control the recording power of the light source.
Claim 6
Dependent Claim
30 words
Optical recording apparatus according to any preceding claim characterised in that the optical output control means are arranged to control the duration of recording pulses output by the light source.
Claim 7
Dependent Claim
38 words
Optical recording apparatus according to any preceding claim characterised in that the data read means are arranged to generate data read signals derived from a specific pattern of pits recorded in a calibration region on the recording medium.
Claim 8
Dependent Claim
36 words
Optical recording apparatus according to any preceding claim characterised in that the data read means are arranged to generate data read signals at a time of data verification to check whether information has been correctly recorded.
Claim 9
Dependent Claim
129 words
Optical recording re-generation apparatus characterised in that it comprises (a) within optical recording re-generation apparatus that performs record re-generation of information using an optical head with such as a semi-conductor laser as a light source, (b) a signal re-generation means that re-generates recorded pits, (c) a recording state detection means that detects the state where pits from the output of the said signal re-generation means are recorded, (d) an optical output control means generating signals that control the optical output of the light source at time of information recording in correspondence with the recording state of the pits detected by the said recording state detection means, and (e) an optical source drive means that drives the said light source with the output of the said light output control means.
References Cited (Backward Citations)
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