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:
Jan. 22, 2013
Filed:
Mar. 09, 2011
Takashi Urakawa, Kawasaki, JP;
Keiichiro Ishihara, Yokohama, JP;
Takashi Urakawa, Kawasaki, JP;
Keiichiro Ishihara, Yokohama, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
The image projection apparatus includes a laser light source, and a scanning device scanning a light flux from the laser light source in horizontal and vertical directions at mutually different frequencies on a projection surface. A condition of is satisfied. A represents a diameter of an exit pupil when viewed from a projection surface side, L represents a distance from the exit pupil to an image formation position of the light flux, X represents a distance from the exit pupil to an output measurement position, B and C respectively represent vertical and horizontally scanning angular subtenses of a scan pulse formed by the light flux, the scan pulse having a pulse length equal to or shorter than 18 microseconds and passing through a measurement aperture placed at the output measurement position.