Optical recording medium
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsKeisuke Takuma, Tsutami Misawa, Kenichi Sugimoto, Taizo Nishimoto, Takeshi Tsuda, Hideki Umehara
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AssigneeMitsui Toatsu Chemicals, Inc.
InventorsKeisuke Takuma, Tsutami Misawa, Kenichi Sugimoto, Taizo Nishimoto, Takeshi Tsuda, Hideki Umehara
Estimating the term…
The present invention relates to an optical recording medium having a recording layer, a reflective layer and a protective layer on a substrate, wherein a quinophthalone compound represented by the following formula (1) is contained in the above recording layer. The use of the quinophthalone compound or a mixture of the quinophthalone compound and a photoabsorbing compound having an absorption maximum in a wavelength falling in a range of 550 to 900 nm in the recording layer makes it possible to provide an interchangeable optical recording medium not only capable of recording and reproducing with a laser having a wavelength falling in a range of 480 to 600 nm, but is also capable of recording and reproducing with red lasers having wavelengths of 630 nm and 680 nm and a near infrared laser having a wavelength of 780 nm. ##STR1##
An optical recording medium comprising a recording layer, a reflective layer and a protective layer provided on a substrate, wherein the recording layer contains a quinophthalone compound represented by the following Formula (1) and having an absorption maximum in a wavelength falling in a range of 400 to 500 nm:
Dependencies are inferred from the claim text.