The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 19, 1996
Filed:
Nov. 08, 1994
Mikiya Kuroda, Yokohama, JP;
Victor Company of Japan, Ltd., Yokohama, JP;
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.