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:
Feb. 18, 1992
Filed:
Nov. 06, 1989
Kazunari Taki, Nagoya, JP;
Hideo Maruyama, Kuwana, JP;
Yumiko Ohashi, Hajima, JP;
Riki Matsuda, Nagoya, JP;
Brother Kogyo Kabushiki Kaisha, Aichi, JP;
Abstract
An optical recording disk comprises a base plate, a flat layer, an optical recording layer and a protection layer which are laminated in this order. The flat layer has a flat surface which contacts with the optical recording layer to thereby enable the optical recording layer to have a uniform thickness over the layer and make the surface of the optical recording layer flat. At least one of the other layers constituting the above optical disk other than the optical recording layer comprises a material capable of recording and reproducing information, such as a magnetooptic material, a phase-change material, an organic pigment and a pit-formable material in which the information is recordable.