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:
Apr. 16, 1996
Filed:
Sep. 24, 1993
Hitoshi Taniguchi, Tsurugashima, JP;
Fumio Matsui, Tsurugashima, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
An optical recording medium comprises a baseplate and a record film, on which information is recorded,disposed on the base plate, the record film containing 5-dimethylamino indolyl fulgide, of the specific formula, and a resin binder. The information recorded in the optical recording medium is reproduced by irradiating a first light to the record film, the first light being absorbed by 5-dimethylamino indolyl fulgide in an open ring form, whereby the open ring form is changed to a closed ring form and information is recorded and irradiating a second light to the record film in which record is recorded, the second light having zero of quantum yield in changing the closed ring form to the open ring form and being absorbed by the closed ring form, whereby the recorded information is reproduced.