Patent JPH04161702A successfully refreshed from Google Patents.
EP0109130A2
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EP
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Apparatus for controlling the write beam on an optical data recording system
Assignee: Koninklijke Philips NV
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Filing: 1983-11-10
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Granted: —
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Expires: 2003-11-10
Abstract
Abstract Apparatus for recording data by means of a beam or radiation on a recording medium which upon exposure to the beam undergoes optically detectable changes in the form of pits, which apparatus includes means for reducing the beam intensity as a result of pit initiation thereby forming more accurate pits.
Inventors
- 👤 Eric Jan Frankfort
- 👤 George Churchill Ii Kenney
- 👤 Robert Mcfarlane
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 07:55
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/125; G11B7/126; G11B27/00; G11B27/36; G11B7/004; G11B7/0045
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
144 words
An apparatus for recording data in a form detectable by a read beam of radiation on a recording medium which comprises a radiation sensitive material, said apparatus comprising means for directing a write beam of radiation onto the recording medium; means for producing relative movement between said write beam and said recording medium, means for modulating said write beam in accordance with the data to be recorded so that said write beam records the data on the recording medium by forming thereon a pattern of spaced apart data spots arranged in an elongated track; characterized in that it comprises means for detecting the reflected beam caused by said write beam when it strikes said recording medium; means for determining the intensity of said reflected beam; and control means responsive to the intensity of said reflected beam for reducing the intensity of said write beam.
Claim 2
Independent Claim
144 words
An apparatus for recording data in a form detectable by a read beam of radiation on a recording medium which comprises a radiation sensitive material, said apparatus comprising means for directing a write beam of radiation onto the recording medium; means for producing relative movement between said write beam and said recording medium, means for modulating said write beam in accordance with the data to be recorded so that said write beam records the data on the recording medium by forming thereon a pattern of spaced apart data spots arranged in an elongated track; characterized in that it comprises means for detecting the reflected beam caused by said write beam when it strikes said recording medium; means for determining the intensity of said reflected beam; and control means responsive to the intensity of said reflected beam for reducing the intensity of said write beam.
Claim 3
Dependent Claim
50 words
Apparatus according to Claim 1, characterized in that said control means includes a comparator which compares the intensity of said reflected beam with a predetermined intensity and reduces the intensity of said write beam upon a prescribed relationship existing between said predetermined intensity and the intensity of said reflected beam.
Claim 4
Dependent Claim
26 words
Apparatus according to Claim 2, characterized in that said detecting means produces an electrical signal responsive to and representative of the intensity of said reflected beam.
Claim 5
Dependent Claim
23 words
Apparatus according to Claim 3, characterized in that the comparator compares the electrical signal with a predetermined electrical signal representing said predetermined intensity.
Claim 6
Dependent Claim
15 words
Apparatus according to Claim 4, characterized in that the detecting means is a photodiode detector.
Claim 7
Dependent Claim
18 words
Apparatus according to Claim 5, characterized in that the control means controls the output of the modulating means.
References Cited (Backward Citations)
No citation records indexed.
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