Optical information recording medium
AssigneeFuji Photo Film Co., Ltd.
InventorYoshihisa Usami
Life of this patent
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Abstract
A disk-shaped optical information recording medium comprising a recording layer, a pressure sensitive adhesive layer or an adhesive layer, and a cover sheet in this order on a substrate, and having a central hole, a track pitch of 300 to 600 nm and a groove depth of 40 to 150 nm, for recording and playing back information by being irradiated with a laser light at a wavelength of 500 nm or less, wherein the substrate and the cover sheet are closely adhered via the pressure sensitive adhesive layer or the adhesive layer at a region including a portion of an inner circumference vicinity and an outer circumference vicinity, and the maximum value for the radial length of the closer adhesion region is at least 0.4 mm.
Claims6
A disk-shaped optical information recording medium comprising a recording layer, at least one of a pressure sensitive adhesive layer and an adhesive layer, and a cover sheet in this order on a substrate, and having a central hole, a track pitch of 250 to 400 nm and a groove depth of 10 to 150 nm, the recording medium for recording and playing back information by being irradiated with a laser light at a wavelength of no more than 500 nm,
- wherein the substrate and the cover sheet are closely adhered via the at least one of the pressure sensitive adhesive layer and the adhesive layer at a region, which includes at least a portion of at least one of an inner circumference vicinity and an outer circumference vicinity.
Dependencies are inferred from the claim text.