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:
May. 15, 2018
Filed:
Nov. 29, 2016
Canon Kabushiki Kaisha, Tokyo, JP;
Fumihiko Yamaya, Mishima, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
An image forming apparatus includes an optical scanning unit including a rotatable polygonal mirror, a detecting portion, and a slit; and a controller. The slit includes a first portion where a slit width is a first width with respect to a main scan direction and a second portion, different in position from the first portion with respect to a sub-scan direction, where the slit width is a second width different from the first width with respect to the main scan direction. The controller identifies one of reflecting surfaces of the rotatable polygonal mirror as a reference surface on the basis of a plurality of detected signals acquired by detecting a plurality of light beams which are deflected by the respective reflecting surfaces and which pass through the slit.