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:
Oct. 06, 1992
Filed:
Oct. 24, 1989
Kazuhiro Ichinokawa, Tokyo, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A laser shutter mechanism is provided and fitted to a window in an optical system container of, e.g., an optical scanning unit in a laser beam printer. The shutter comprises a screen member for preventing the laser beam from emitting through a window to a beam receiving unit. The screen member is movable between its operative and inoperative positions, while it is biased to its operative position wherein it closes the window. An operating member is provided on the beam receiving unit for moving the screen member to its inoperative position where the window is allowed to emit the laser beam therethrough. Only when said beam receiving unit is properly positioned against the window, does the operating member moves the screen member.