Method of producing masks for rom type optical recording...

Details Method of producing masks for rom type optical recording... Method of producing masks for rom type optical recording...

G - Physics

11

B

352/32.1

G11B 7/26 (2006.01) G11B 7/0033 (2006.01) G11B 7/24 (2006.01)

Patent

CA 1330837

ABSTRACT OF DISCLOSURE A method of producing a plurality of masks which are used when ROH type data are written in an optical recording medium for ROH type optical recording cards The method is practiced by way of steps of producing a mother mask having a preformatting pattern, next, transcribing the preformatting pattern for the mother mask, next, producing a master mask having a required optical recording pattern written therein and next, producing a working mask from the master mask. When the preformatting pattern is prepared in a writable type, writing or inspecting of the master mask or inspecting of the working mask or mother mask can be achieved using a writing/reading apparatus for writable type optical recording cards.

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