Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1978-12-11
1980-08-05
Cardillo, Jr., Raymond F.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
1791003V, 274 42R, 346 76L, 3461351, H04N 576, G11B 724, G01D 1534
Patent
active
042165016
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) which is coated with a dielectric material (e.g., silicon dioxide) highly transparent for light of a frequency supplied by a recording laser, which dielectric material is coated with a thin layer of a material absorptive for light of the frequency supplied by the recording laser (e.g., titanium). 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 at least cause melting of the absorptive layer, an information track is formed as a succession of spaced pits in which the reflective layer is effectively exposed through the layer of dielectric material. 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 melting of the remaining absorptive layer, 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.
REFERENCES:
patent: 3560994 (1971-02-01), Wolff et al.
patent: 3665483 (1972-05-01), Becker
patent: 3739088 (1973-06-01), Landsman
patent: 3747117 (1973-07-01), Fechter
patent: 4023185 (1977-05-01), Bloom et al.
patent: 4069487 (1978-01-01), Kasai
patent: 4097895 (1978-06-01), Spong
Greenblott, High Density Information Recording by Vaporization of Film Areas, IBM Tech. Disc. Bulletins, vol. 14, No. 8, 1/72, p. 2358.
Cardillo, Jr. Raymond F.
RCA Corporation
Roehling J. E.
Tripoli J. S.
Whitacre E. M.
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