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:
Dec. 24, 1991
Filed:
Nov. 20, 1990
Masaru Yamamoto, Tokyo, JP;
Yoshinobu Tanaka, Tokyo, JP;
Kyocera Corporation, Kyoto, JP;
Abstract
A film is placed on a front surface of a pressure plate. The pressure plate has, at its central portion, a plurality of small through-holes through which the film is sucked to provide sufficient flatness of the film during each exposure. A closed variable space is formed in the rear of the pressure plate by a variable container including the central portion of the pressure plate. The film is sucked by increasing the volume of the closed variable space by means of an electromagnetic actuator which comprises a moving coil mounted on the variable container at its rear side and a fixed permanent magnet providing a magnetic field for interaction with the moving coil. The actuator is driven by a drive circuit.