Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
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.
Aoi Toshiki
Shinkai Masahiro
Evans Elizabeth
Ryan Patrick J.
TDK Corporation
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