Multi-layered optical recording medium

Details Multi-layered optical recording medium Multi-layered optical recording medium

2005-10-11

2005-10-11

Mulvaney, Elizabeth (Department: 1774)

Stock material or miscellaneous articles

Circular sheet or circular blank

C428S064400, C430S270120

Reexamination Certificate

active

06953616

ABSTRACT:
A multi-layered optical recording medium comprising a plurality of sets of at least a recording layer formed of an inorganic material and a resin layer formed of an energy-beam curable resin as an overlaying layer of the recording layer on a base with a fitting center hole formed in a center part. The recording layer except the recording layer immediately adjacent to the base are formed so that the inner circumferential edge of a cover layer, an upper layer, having a larger inner diameter than that of a spacer layer, a lower layer, is located on the outside of the inner circumferential edge of the recording layer in a range of 2 mm to 15 mm inclusive. The adhesive force between the spacer layer and the cover layer can be increased, and thus, separation at each inner circumferential edge between the recording layer and the spacer layer, between the recording layer and the cover layer, and between the spacer layer and the cover layer can be effectively avoided.

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English Language Abstract of JP 57-169938, published Nov. 2, 2001.
English Language Abstract of JP 57-172549. published Oct. 23, 1982.
English Language Abstract of JP 8-279183,published Oct. 22, 1996.
English Language Abstract of JP 2000-36132, published Feb. 2, 2000.
English Language Abstract of JP 2001-273674, published Oct. 5, 2001.
English Language Abstract of JP 2000-235733, published Aug. 29, 2000.

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