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:
Sep. 20, 2011
Filed:
Sep. 16, 2008
Takeshi Sowa, Matsumoto, JP;
Yujiro Nomura, Shiojiri, JP;
Ryuta Koizumi, Shiojiri, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A line head includes a positive lens system having two lenses, image-side and object-side lens arrays, a light emitter array on an object side of the positive lens system, and an aperture plate that forms an aperture diaphragm. Where the row number of lenses arrayed in a second direction is 'm', a gap between effective regions of two image-side lenses adjacent to each other in a first direction is 'α', an image-side angle of aperture is ‘θi’, a width of light-emitting elements images in the first direction is ‘Wi’, a focal length of the image-side lens is ‘f’ and a distance from an image-side principal plane of the image-side lens to an image surface is ‘Si’, the following conditions are satisfied: f≦(mWi−α)/(2θi), Wi≧2Siθi/(m−1)+α/(m−1).