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:
Jul. 03, 1984
Filed:
Jun. 23, 1983
Koichi Kotera, Hyogo, JP;
Takeo Ohta, Nara, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
Proposed is a method for manufacturing an optical memory disc having a pregrooved substrate and a recording film on the pregrooved substrate. In the step of depositing the recording film on the pregrooved substrate, light is incident on the pregrooved substrate, and at least one of exposure amounts of light reflected by and light transmitted through the pregrooved substrate and the recording film while the recording film is being deposited on the pregrooved substrate is measured. When one of the exposure amounts of light reflected by and light transmitted through the pregrooved substrate and the recording film has reached the corresponding preset exposure amount, the deposition of the recording film is stopped.