Method and apparatus for recording a pattern of areas of modifie

Details Method and apparatus for recording a pattern of areas of modifie Method and apparatus for recording a pattern of areas of modifie

1990-11-13

1993-10-19

Fuller, Benjamin R.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346 76L, 369116, G01D 900, G01D 1510, G11B 700

Patent

active

052550079

ABSTRACT:
A method and apparatus for recording an information signal on the recording layer of an optical record carrier by writing areas of modified optical properties in such layer. The layer is heated locally to a temperature above the write temperature by scanning with a laser beam whose power (P) is pulsed between a low level (Pl) and a write level (Ps) in accordance with the information signal. A signal (.alpha.(t)) which is indicative of the speed with which the write areas are formed, and therefore of the dimensions of such areas, is derived by a measurement circuit (50) from the radiation reflected from the recording layer. The measurement circuit is part of an adjustment circuit (12) which also includes a control circuit (60) which derives an adjustment signal (Ih) for a laser drive circuit (13) to control the write power (Ps) of the laser beam in accordance with the area forming-speed signal (.alpha.). This substantially reduces the effect of changing recording conditions on the dimensions of the write areas having modified optical properties, permitting substantially optimum dimensions of such areas to be maintained during recording.

REFERENCES:
patent: 4507767 (1985-03-01), Takasugi
patent: 4562567 (1985-12-01), Frankfort et al.
patent: 4631713 (1986-12-01), Romeas et al.
patent: 4680594 (1987-07-01), Bracht
patent: 4710908 (1987-12-01), Ohshima et al.
patent: 4998237 (1991-03-01), Osakabe et al.
patent: 5050156 (1991-09-01), Barton
patent: 5126994 (1992-06-01), Ogawa et al.

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