G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.1
G11B 7/013 (2006.01) G11B 7/0045 (2006.01) G11B 11/105 (2006.01) G11B 13/04 (2006.01)
Patent
CA 1296425
PHN 11.915 24 04.02.1987 ABSTRACT: Method of recording a binary signal on an optically readable record carrier and apparatus for carrying out the method. A method and apparatus are described for re- cording a binary information signal (Fig. 2a) on a record carrier (1) having an information layer (2) whose optical properties are modified upon heating. An information pattern corresponding to this informa- tion signal (Fig. 2a) is obtained in that the record carrier 1 is moved relative to an optical system (3) for focussing a radiation beam (4) on the information layer (2), a subsequent recording mark (5) being written on the information layer (2) in selected time inter- vals (?) by locally heating the information layer by means of the radiation beam (4). The amount of radiation energy (E) applied in a selected time interval depends on the position of the selected time interval (?) in the sequence of consecutive selected time intervals (?). This provides compensation for the influence of the radiation energy (E) applied in the preceding time interval ( ? ) on the temperature at the location of the recording mark (5) to be written in the time interval (?), so that for each recording mark (5) the temperature (Tr) which is reached in the informa- tion layer (2) and hence the size of the recording mark (5) is substantially the same. (Fig. 2).
549716
Farla Martin A.j.p.
Van Tongeren Hendricus F.j.j.
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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