Base plate for recording disc and a method for its manufacture

Details Base plate for recording disc and a method for its manufacture Base plate for recording disc and a method for its manufacture

1990-01-09

1991-01-15

Powell, William A.

Stock material or miscellaneous articles

Surface property or characteristic of web, sheet or block

Surface modified glass

156628, 156645, 156654, 156663, 65 31, 252 792, 360135, 427129, 428156, B44C 122, C03C 1500, C03C 2506, B32B 1700

Patent

active

049853066

ABSTRACT:
Herein disclosed is a method for manufacturing a base plate for a recording disc, which comprises steps of: subjecting a base plate containing therein SiO.sub.2 -Li.sub.2 O-Al.sub.2 O.sub.3 series crystallized glass to crystallizing treatment; then polishing the surface of said base plate; and thereafter subjecting the base plate to etching treatment with use of etching agents having different rates of etching between the crystallized layer and the amorphous layer, and also a base plate for a recording disc which is produced by the method as described above.

REFERENCES:
patent: 3976523 (1976-08-01), Andreeva et al.
patent: 4725375 (1988-02-01), Fujii et al.
patent: 4797316 (1989-01-01), Hecq et al.
patent: 4859505 (1989-08-01), Nakayama et al.

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