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:
Aug. 08, 1989
Filed:
Dec. 23, 1987
Sumio Ikegawa, Tokyo, JP;
Akio Hori, Kawasaki, JP;
Shuichi Komatsu, Yokohama, JP;
Shinji Arai, Chigasaki, JP;
Nobuaki Yasuda, Zushi, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
There is disclosed a bubble-mode data-rewritable optical disc, which has a transparent substrate and a recording layer, formed on the substrate, for storing data to be optically rewritable. The substrate is at least partially formed of an organic material, which releases a gas component when it is heated at a radiation region of a data recording light beam. The recording layer is deposited on the substrate by co-sputtering or co-vacuum evaporation. The recording layer is made of a specific amorphous material containing silicon and fine metal particles. When the gas component is released from the substrate, the recording layer is deformed to be locally peeled off out of the substrate by pressure of the gas component, thus forming a protuberance. In a data erasing mode, a data erasing light beam is radiated onto the recording layer, which is then deformed so as to cause the protuberance to disappear, and has a substantially flat surface, thereby erasing the stored information.