EP0206824A2
Expired / Lapsed
EP
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Apparatus for thermally recording data
Assignee: International Business Machines Corp
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Filing: 1986-06-25
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Granted: —
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Expires: 2006-06-25
Abstract
Abstract An optical information-bearing-signal recorder employs thermally-induced recording of ablative, material movement, material phase change, magneto-optic or similar technologies. Synchronous noise in the recording is reduced by employing a heat-inducing energy pulse, coherent light for example, shaped to have an initial recording-initiating intensity amplitude followed by a recording-sustaining amplitude. The duration of the recording-initiating amplitude portion is constant for all lengths of signals being recorded. When a rotating optical disk is employed as a record-bearing medium, the recording-initiating and recording-sustaining amplitudes are increased with increasing radius of the recording on the disk.
Inventors
- 👤 Julian Lewkowicz
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 23:09
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; G11B11/1053; G11B11/10532; G11B11/10534; G11B11/10536; G11B7/004; G11B7/0045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
Apparatus for thermally recording data on a thermally-responsive record member (11) during motion thereof comprising:- an energy-emitting source (15) capable of locally heating the surface of such a record member in response to an applied recording signal with an intensity related to the amplitude of the recording signal, and recording signal generating means (12) responsive to an input data pulse train (40) to produce a corresponding train (25) of recording signal pulses, each recording signal pulse (54) comprising a high amplitude portion (44) followed by a lower amplitude portion (55), characterised in that the recording signal generating means is arranged to reduce the amplitude of each recording signal pulse in a predetermined time dependent manner.
Claim 2
Dependent Claim
115 words
Apparatus for thermally recording data on a thermally-responsive record member (11) during motion thereof comprising:- an energy-emitting source (15) capable of locally heating the surface of such a record member in response to an applied recording signal with an intensity related to the amplitude of the recording signal, and recording signal generating means (12) responsive to an input data pulse train (40) to produce a corresponding train (25) of recording signal pulses, each recording signal pulse (54) comprising a high amplitude portion (44) followed by a lower amplitude portion (55), characterised in that the recording signal generating means is arranged to reduce the amplitude of each recording signal pulse in a predetermined time dependent manner.
Claim 3
Dependent Claim
84 words
Apparatus as claimed in claim 1, in which said recording signal generating means includes means (52, 54, 56) for producing for each input data pulse a first signal (53) of predetermined amplitude and of duration proportional to that of the corresponding input pulse, means (43, 47, 50) for producing a second signal (45), initially coincident with the first signal, of predetermined amplitude and fixed duration, and means (14) for adding the first signal to the second signal to produce said recording signal pulse train.
Claim 4
Dependent Claim
85 words
Apparatus as claimed in claim 1, in which said recording signal generating means includes means (52, 54, 56) for producing for each input data pulse a first signal (53) of predetermined amplitude and of duration proportional to that of the corresponding input pulse, means (43, 47, 50, 62) for producing a second signal, initially coincident with the first signal, of gradually reducing amplitude and fixed duration, and means (14) for adding the first signal to the second signal to produce said recording signal pulse train.
Claim 5
Dependent Claim
22 words
Apparatus as claimed in any preceding claim, in which said thermally-sensitive record-member is also magnetically-sensitive and said energy-emitting source is a laser.
Claim 6
Dependent Claim
61 words
Apparatus as claimed in any preceding claim, in which said thermally-sensitive record-member is in the form of a rotatably-mounted disk, said energy-emitting source is at a variable distance from the axis of rotation of said disk, and said recording signal generating means is arranged to vary the amplitude of the recording signal in a manner dependent linearly on said variable distance.
References Cited (Backward Citations)
No citation records indexed.
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