Optical information recording medium

Details Optical information recording medium Optical information recording medium

1997-07-28

1999-10-05

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 644, 428 645, 428457, 428913, 43027013, 4304951, 430945, 369283, B32B 300

Patent

active

059621001

ABSTRACT:
In a rewritable optical information recording medium, a transparent interference layer, a translucent interference layer, a lower protection layer, a recording layer, an upper protection layer, and a reflection layer are formed on a substrate in that order. The transparent interference layer has a reflectance which changes in accordance with a wavelength of a beam incident on the substrate, and the translucent interference layer has a light transmittance smaller than that of the transparent interference layer. In this constitution, by determining appropriate thicknesses of the above-mentioned layers, a reflectance of a non-recorded portion of the recording medium with respect to a reproducing beam can be increased. Further, reflectances of the non-recorded and recorded portions with respect to a recording and erasing beam can be decreased, so that it becomes easy to record and erase information in the recording medium.

REFERENCES:
patent: 5234737 (1993-08-01), Ueno et al.
patent: 5314734 (1994-05-01), Nishida et al.
patent: 5395669 (1995-03-01), Kawahara et al.
patent: 5418030 (1995-05-01), Tominaga et al.
patent: 5419937 (1995-05-01), Coombs et al.

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