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:
Mar. 20, 1990
Filed:
Jun. 23, 1989
Haruki Kawada, Atsugi, JP;
Hiroshi Matsuda, Atsugi, JP;
Takashi Nakagiri, Tokyo, JP;
Yoshinori Tomida, Atsugi, JP;
Kenji Saito, Tokyo, JP;
Toshiaki Kimura, Sagamihara, JP;
Toshihiko Miyazaki, Atsugi, JP;
Ken Eguchi, Atsugi, JP;
Yukuo Nishimura, Sagamihara, JP;
Kunihiro Sakai, Yamato, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical recording-reproducing method comprising the step of irradiating a radiation for polymerization on an optical recording medium having a recording layer containing at least one selected from the group consisting of azulenium salt compounds, pyrylium dyes, diene compounds, croconic methine dyes and polymethine compounds (hereinafter called the group B) and a diacetylene derivative compound; the step of irradiating a radiation corresponding to a recording information to thereby change the color at the irradiated portion of the recording layer; and the step of reading the recorded information by irradiating a reading light with a shorter wavelength than said radiation on said recording layer. Also, an optical recording-reproducing device utilizes the above-mentioned method.