Optical storage medium

Details Optical storage medium Optical storage medium

1987-10-22

1989-06-27

Robinson, Ellis P.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428209, 428412, 428461, 428463, 428500, 428522, 428913, 428156, 428161, 428164, 428167, 369275, 369280, 369288, 369292, 430945, 346 76L, 3461351, B32B 302

Patent

active

048428248

ABSTRACT:
An optical storage medium comprises a thermoplastic resin substrate having a concave and convex surface grating on one surface thereof, and a metal layer covering the concave and convex surface grating. The period of the concave and convex surface grating is less than a wavelength of light so that light reflected from the concave and convex surface grating is changed from linear polarization to elliptical polarization, while there is no change in the polarization of light reflected from a recording pit in which the concave and convex surface grating has collapsed. Therefore, information can be read out of the optical storage medium in accordance with the change of light polarization.

REFERENCES:
patent: 4576850 (1986-03-01), Martens
patent: 4582885 (1986-04-01), Barber
patent: 4668558 (1987-05-01), Barber
Wilson et al., "The Optical Properties of `Moth Eye` Antireflection Surfaces", Optica Acta, vol. 29, No. 7, pp. 993-1009 (1982).
Craighead et al., "Textured Germanium Optical Storage Medium", Appl. Phys. Lett. 40(8), pp. 662-664 (Apr. 15, 1982).
Enger et al., "Optical Elements with Ultrahigh Spatial-Frequency Surface Corrugation", Applied Optics, vol. 22, No. 20, pp. 3220-3228 (Oct. 15, 1983).
Born, Principles of Optics, Chapter 14, Section 14.5.2, pp. 705-708 (2nd edition 1964).

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