Information recording medium having a protection film and a read

Details Information recording medium having a protection film and a read Information recording medium having a protection film and a read

1995-06-05

1997-04-22

Hindi, Nabil

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 58, G11B 700

Patent

active

056234791

ABSTRACT:
A substantially transparent optical protection film formed on the surface of an information recording medium on which a dot pattern is printed for preventing printing quality from being degraded due to wear of the dot pattern. The protection film is formed to have such an optical thickness as to lower a predetermined amount of contrast of the dot pattern so that an image of dust or flaw on the protection film is defocused on an image pickup device, with the result that an adverse effect of the dust or flaw upon reading of the dot pattern can be eliminated.

REFERENCES:
patent: 4855992 (1989-08-01), Ikegawa et al.
patent: 5235591 (1993-08-01), Nakamura et al.
patent: 5270987 (1993-12-01), Kaku et al.
patent: 5363352 (1994-11-01), Tobita et al.
patent: 5485444 (1996-01-01), Kuhn et al.

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