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. 24, 2012
Filed:
Sep. 12, 2008
Yoshiaki Maeno, Mizuho, JP;
Atsushi Yamaguchi, Mizuho, JP;
Yoshiaki Maeno, Mizuho, JP;
Atsushi Yamaguchi, Mizuho, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Sanyo Optec Design Co., Ltd., Tokyo, JP;
Abstract
A laser beam and a servo beam are incident on a mirror and a transparent member, respectively, so that an angle direction Afrom an optical axis of the laser beam to be incident on the mirror to an incidence plane of the mirror and an angle direction Afrom an optical axis of the servo beam to be incident on the transparent member to an incidence plane of the transparent member are opposite to each other. With such layout of an optical system, scan loci of the servo beam corresponding to respective scan lines become closer to parallel. In the incidence plane and the outgoing plane of the servo beam of the transparent member, fine periodic structures tapered from the incidence plane and the outgoing plane are formed at pitches each equal to or less than a wavelength band of the servo beam. By this periodic structure, reflection of the servo beam on the incidence plane and the outgoing plane is suppressed.