Optical recording medium

Details Optical recording medium Optical recording medium

1979-01-26

1981-01-13

Miller, Jr., George H.

Recorders

Record receivers and/or driving means therefor

Laminated, impregnated, or coated bases

346 11, G01D 1534

Patent

active

042452295

ABSTRACT:
An optical recording medium is disclosed which comprises a reflecting material, the surface of which is characterized by cavities of average depth D and of average spacing S such that for incident radiation of wavelength .lambda., S is less than about .lambda./20 and D is either greater than .lambda./6 or less than .lambda./6 and is capable of being altered to either less than or greater than .lambda./6, respectively.
In the practice of the invention, the heat from a high intensity energy source, such as a laser operating in the ultraviolet, optical or near-infrared region or a beam of electrons, softens the reflective material at the surface and, depending on the sign of the surface energy, either increases or decreases D, thus lowering or raising the reflectivity of the surface, respectively.

REFERENCES:
patent: 3427628 (1969-02-01), Clunis
patent: 3787873 (1974-01-01), Sato et al.
patent: 3893127 (1975-07-01), Kaplan et al.
patent: 4065306 (1977-12-01), Ross et al.
Bartolini, R. A. et al., Optical Disk Systems Emerge, IEEE Spectrum, Aug. 1978, pp. 20-28.

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