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Optical recording disk
| Details |
Inventors: Arioka, Hiroyuki; Aoi, Toshiki; Ogawa, Akio; Dohi, Hideki;
Assignee: TDK Corporation (Tokyo, JP)
Primary Examiner: Ryan; Patrick J.
Assistant Examiner: Evans; Elizabeth
Attorney, Agent or Firm: Watson, Cole Grindle & Watson
An optical recording disk includes a dye base recording layer, an intermediate layer, and a reflective layer on a substrate in the described order. The reflective layer is composed of one or more metal elements, for example, copper alloy, and the intermediate layer contains a compound of the one metal element or a compound of at least one of the metal elements, for example copper oxide. The intermediate layer minimizes undesirable interactions between the recording and reflective layers. |
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DETAILED DESCRIPTION Therefore, an object of the invention is to provide a novel and improved optical recording disk having a dye base recording layer which disk is less expensive and highly reliable.
The present invention provides an optical recording disk comprising on a substrate a dye base recording layer, an intermediate layer, and a reflective layer in the described order.
The reflective layer is composed of one or more metal elements, and the intermediate layer contains a compound of the one metal element or a compound of at least one of the metal elements where the reflective layer contains more than one metal element.
Typically the intermediate layer is 3 to 30 nm thick.
Preferably the reflective layer contains at least one metal element selected from the group consisitng of Zn, Sn, Ag, Cu, Ti, V, Ta, Cr, Mo, W, Mn, Fe, Co, Rh, Ni, Pd, Pt, Au and Al.
The metal element contained in the intermediate layer is the same as the metal element contained in the reflective layer in an amount of at least 1% by weight.
The metal element is contained in the intermediate layer in an amount of at least 5% by weight.
The metal element compound contained in the intermediate layer is an oxide, nitride or sulfide or a mixture thereof, especially an oxide.
ADVANTAGES The present invention provides an optical recording disk having a dye base recording layer, an intermediate layer, and a reflective layer on a substrate in a close contact arrangement and capable of recording/reproducing operation according to the CD standard.
The intermediate layer disposed between the recording and reflective layers contains a compound of the same metal element as in the reflective layer.
The intermediate layer is effective for mitigating the differential potential between the adjoining layers for preventing any reaction of the dye and quencher in the recording layer with the reflective layer, thus minimizing deterioration of the dye and reflective layers and a lowering of signal outputs.
The intermediate layer is also effective for enhancing the adhesion between the intermediate and reflective layers
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