Optical recording medium

Details Optical recording medium Optical recording medium

1995-03-30

1997-05-20

Ryan, Patrick

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 644, 428 648, 428913, 43027013, 430945, 430531, 3692751, 3692752, 369283, 369288, B32B 300

Patent

active

056310560

ABSTRACT:
There is disclosed an optical recording medium for high density recording without degradation of reproducing output signals. The optical recording medium includes a transparent substrate made of resin having an information recorded portion on which optically readable information signals are recorded, a thermochromic layer provided over the transparent substrate, the thermochromic layer having a larger light transmittance when the thermochromic layer has a higher temperature than a threshold value by absorbing heat off a laser beam spot and the thermochromic layer having a smaller light transmittance when the thermochromic layer has a lower temperature than the threshold value by being cooled down, and a reflecting layer provided on the thermochromic layer, wherein a heat radiating layer made of transparent inorganic material is further provided in contact with the thermochromic layer so as to absorb heat generated in the thermochromic layer by being irradiated with the laser beam spot.

REFERENCES:
patent: 5153873 (1992-10-01), Spruit et al.
patent: 5246758 (1993-09-01), Matsui
patent: 5344682 (1994-09-01), Mizukuki
patent: 5356685 (1994-10-01), Fleming

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