Preformatted optical recording card and method of producing...

Details Preformatted optical recording card and method of producing... Preformatted optical recording card and method of producing...

G - Physics

11

B

352/32.4

G11B 7/013 (2006.01) G11B 7/26 (2006.01) G11B 7/0033 (2006.01)

Patent

CA 1287918

ABSTRACT OF THE DISCLOSURE An improved art of producing an optical recording medium by utilizing a photo-etching technique is disclosed. Pits pattern of address for guide groove and sector on each of tracks of optical recording medium to be preformatted is formed in accordance with a photo-etching process or a resist lift-off process. A film of optical recording medium is formed on a transparent base plate and it is then subjected to photo-etching process or alternatively to resist lift-off process to form preformatted pits pattern.

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