Optical recording disk

Details Optical recording disk Optical recording disk

1991-06-25

1993-05-25

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428913, 430945, 346 76L, 3461351, 3692751, B32B 300

Patent

active

052138593

ABSTRACT:
In an optical recording disk 1 comprising a dye layer 2 formed on a substrate 3 as a light absorbing layer and a reflective layer 4 stacked thereon, tracking servo control is carried out by the push-pull method. To produce normal and accurate tracking error signals, the surface of the dye layer 2 includes depressed and raised sections corresponding to grooves 31 and lands 35 and .DELTA.D which is given by the formula:

REFERENCES:
patent: 4949331 (1990-08-01), Maeda et al.
patent: 5060223 (1991-10-01), Segawa
Nikkei Electronics; Jan. 23, 1989; No. 465; p. 107.
SPIE; vol. 1078; Optical Recording Topical Meeting; 1989, pp. 80-87.
Kinki Chemical Society; Mar. 3, 1989, Functional Dye Department; pp. 15-20.

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