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:
Jun. 12, 2012
Filed:
Aug. 22, 2006
Tetsuya Nagase, Yokohama, JP;
Tetsuya Nagase, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
At least one exemplary embodiment is directed to a first airflow guide device covering an upper portion of a polygon mirror and having respective opening portions in an upper surface and a lower surface. The lower surface opening portion can have an annular wall opened in the direction all around the perimeter of the polygon mirror, facilitating an airflow path capable of circulating an airflow between the upper surface opening portion and the lower surface opening portion. Thus, airflow generated in a vertical direction in association with the rotation of the polygon motor, is guided, and variations in pressure applied to the polygon motor are reduced, thus facilitating an increase in the rotation accuracy of the polygon motor.