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. 06, 1993
Filed:
Aug. 18, 1989
Hitachi Maxell, Ltd., Osaka, JP;
Abstract
An apparatus for producing an optical data recording medium comprising a turn table adapted to support a substrate of the recording medium and a nozzle for dropping a coating liquid onto the substrate, the coating liquid dropped on the substrate being spread over the substrate by a rotational force of the turn table to form a coating layer, the apparatus being provided with a gas flow suppressing type housing which is partitioned off from the atmosphere so as to suppress the convection current flowing, due to the rotation of the turn table, toward a central portion of the substrate and further toward the outer circumferential portion thereof along a top surface of the substrate and to suppress the evaporation of a solvent of the coating liquid into the atmosphere, the nozzle being arranged above the inner circumferential portion of the substrate with its end portion being directed to the outer circumferential portion of the substrate, the end portion of the nozzle being inclined so as to form an angle less than 90 degrees relative to the substrate as viewed from a side of the substrate, the coating liquid application being carried out in a hermetically sealed atmosphere within a sealed chamber.