Optical recording medium and the producing method of the optical

Details Optical recording medium and the producing method of the optical Optical recording medium and the producing method of the optical

1994-11-08

1996-11-19

Ryan, Patrick

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 644, 428 648, 428913, 4302701, 43027011, 43027014, 5692752, 5692754, 569283, 569288, B32B 300

Patent

active

055760848

ABSTRACT:
An optical recording medium for high density recording and reproducing has a transparent substrate formed with at least a series of information pits readable with a laser beam from an apparatus or formed with guide grooves for controlling operation of recording the information pits on the substrate and a masking layer provided on the transparent substrate for minimizing an effective spot diameter of the laser beam to pass through the masking layer. The masking layer has an optical transmittance reversely changeable corresponding to a change of temperature by being irradiated with the laser beam. The masking layer is made of a thermochromic material consisting of an electron donative color compound and an electron acceptant developer without polarized materials and is uniformly provided on the uneven transparent substrate formed with the information pits or the guide grooves by using a vacuum deposition method. As the electron acceptant developer, there are employed such organic materials as having electron acceptant developing function and decoloring function by a change of temperature.

REFERENCES:
patent: 5153873 (1992-10-01), Spruit et al.
patent: 5234797 (1993-08-01), Satake
patent: 5246758 (1993-09-01), Matsui
patent: 5284691 (1994-02-01), Taniguchi
Proceeding of the Third Sony Research Forum (1993) pp. 291-295. Title: A High Density Read-Only Optical Disk System Using Superresolution.

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