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:
Mar. 19, 2013
Filed:
Jul. 20, 2011
Noriyuki Chino, Kawasaki, JP;
Katsuhiko Takano, Yokohama, JP;
Shoji Kanemura, Sagamihara, JP;
Junji Yasuda, Kawasaki, JP;
Kota Kiyama, Kawasaki, JP;
Noriyuki Chino, Kawasaki, JP;
Katsuhiko Takano, Yokohama, JP;
Shoji Kanemura, Sagamihara, JP;
Junji Yasuda, Kawasaki, JP;
Kota Kiyama, Kawasaki, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
An optical scanning apparatus capable of properly correcting a main scanning scale factor. Upstream and downstream laser-light detection sensors of the optical scanning apparatus each generate a signal when first or second light beam passes through each of slits formed in the sensors. Based on signals, a scanning time required for each light beam to scan between the sensors is measured. A correction coefficient is decided by a correction value calculation unit based on a difference between wavelengths of the first and second light beams, a scanning time difference is calculated by a comparison unit based on the correction coefficient and scanning times of the light beams, and the downstream laser-light detection sensor is rotated by a sensor rotation drive unit to make the scanning time difference zero, whereby the slits are made parallel to each other.