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:
Jul. 05, 2011
Filed:
Apr. 25, 2007
Kohji Sakai, Tokyo, JP;
Yoshinori Hayashi, Kanagawa, JP;
Takeshi Ueda, Tokyo, JP;
Daisuke Ichii, Kanagawa, JP;
Kenichiroh Saisho, Kanagawa, JP;
Kohji Sakai, Tokyo, JP;
Yoshinori Hayashi, Kanagawa, JP;
Takeshi Ueda, Tokyo, JP;
Daisuke Ichii, Kanagawa, JP;
Kenichiroh Saisho, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An optical scanning device includes a first optical system for guiding light beams emitted from a plurality of light emitting units to an optical deflector, and a second optical system for focusing the light beams to optically scan a surface to be scanned. At least one of the first optical system and the second optical system includes a resin lens having a diffractive surface. The diffractive surface includes a diffractive portion and a refractive portion. A power of the diffractive portion and a power of the refractive portion cancel each other.