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:
May. 30, 1989
Filed:
Jul. 15, 1987
Kazuhiko Maeda, Tokyo, JP;
Toshio Koishi, Sakado, JP;
Central Glass Company, Limited, Ube, JP;
Abstract
An information recording card using a semiconductor laser beam for writing and reading information. The card comprises a recording layer formed on one side of a card substrate and a light absorbing layer closely interposed between the substrate and the recording layer. The material of the recording layer is a polymer blend which comprises a copolymer of vinylidene fluoride and at least one F-containing comonomer, preferably hexafluoroacetone, and an acylic or methacylic ester polymer and which exhibits phase separation by heating. The light absorbing layer is for efficiently absorbing laser light used for recording and transforming it into heat energy. A good embodiment of the light absorbing layer is a film of Bi or Te, and another good embodiment is a thin layer of a resin composition containing fine particles of at least one of Bi, Te and C dispersed in a thermoplastic or thermosetting resin.