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. 13, 2009
Filed:
Dec. 26, 2007
Yoshihiro Inagaki, Toyokawa, JP;
Makoto Ooki, Toyohashi, JP;
Yoshihiro Inagaki, Toyokawa, JP;
Makoto Ooki, Toyohashi, JP;
Konica Minolta Business Technologies, Inc., Chiyoda-Ku, Tokyo, JP;
Abstract
In a main-scanning direction, light incident on a resonance mirror is convergent light and a first lens of a second optical system has a negative refractive power. Consequently, even with a small angle of deflection, the distance from the resonance mirror to a photoconductor required for obtaining a desired scanning width in the main-scanning direction can be reduced. Moreover, in a sub-scanning direction, light incident on the resonance mirror is parallel light, and the first lens of the second optical system has a negative refractive power and a second lens thereof has a positive refractive power. In addition, the first lens has both surfaces formed with a free curved surface and the second lens thereof also has a free curved surface. This permits keeping the sub-scanning magnification uniform, thus avoiding, even in high-speed drawing with a plurality of beams, image quality deterioration due a change in an interval in the sub-scanning direction between the plurality of beams.