Optical recording elements

Details Optical recording elements Optical recording elements

1991-07-26

1993-08-17

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428457, 428913, 430270, 430945, 346 76L, 3461351, 369283, 369288, B32B 300

Patent

active

052367550

ABSTRACT:
An optical recording element has a recording layer (18) protected by an overcoat layer (20) which is transmissive to laser radiation used for writing pits in the recording layer (18). The thickness of the overcoat layer (20) is selected to be less that the conventional 1/2 wavelength thickness and the recording layer thickness is selected, in conjunction with the overcoat layer thickness in such a way that the minimum value of reflectivity on the reflectivity-v-thickness curve is depressed.

REFERENCES:
patent: 4195312 (1980-03-01), Bell et al.
patent: 4305081 (1981-12-01), Spong
patent: 4940618 (1990-07-01), Hamada et al.
Bell, et al., "Antireflection Structures for Optical Recording", IEEE Journal of Quantum Electronics, vol. QE-14, No. 7, Jul. 1978, pp. 487-495.

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