Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1976-03-19
1978-06-27
Cardillo, Jr., Raymond F.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
1791003V, 274 41A, 274 42R, 346 76L, 346135, H04N 576, G11B 724, G01D 1534
Patent
active
040978958
ABSTRACT:
A flat major surface of a disc-shaped substrate (e.g., of glass) is coated with a light-reflective layer (e.g., of aluminum). Overlying the reflective layer is a layer of material (e.g., fluorescein) which is highly absorptive for light of a frequency supplied by a recording laser. The coating parameters are chosen to establish an anti-reflection condition for the coated record blank at the recording light frequency. The light output of the laser, which is intensity modulated in accordance with a signal to be recorded, is focused upon the coated surface of the disc as the disc is rotated. With the peak intensity of the focused light sufficient to cause ablation of the absorptive layer, an information track is formed as a succession of spaced pits in which the reflecting layer is effectively exposed. For playback, light of a constant intensity is focused on the information track as the disc is rotated. The focused light is of insufficient intensity to effect ablation of the remaining absorptive material, but is of a frequency at which the undisturbed regions of the coated disc exhibit an anti-reflection condition. A photodetector, positioned to receive light reflected from the information track as the pits pass through the path of the focused light, develops a signal representative of the recorded information.
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Greenblott, High-density Information Recording by Vaporization of Film Areas, IBM Tech. Disc. Bulletin, vol. 14, No. 8, 1/72 p. 2358.
Cardillo, Jr. Raymond F.
Meagher William H.
RCA Corporation
Whitacre Eugene M.
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