Title:
光走査装置
Document Type and Number:
Japanese Patent JP4612842
Kind Code:
B2
Abstract:
Provided is an optical element capable of reducing Fresnel (surface) reflection on a lens surface which causes flare or ghost, an optical system including the optical element, and an optical scanning device including the optical element. The optical element includes: a plurality of two-dimensionally arranged subwave structures having an anti-reflection function, and in the optical element when directions orthogonal to each other within a plane including a tangent of a vertex of the optical surface are set as a first and second directions, each of distances between the subwave structures changes in at least one of the first and second directions, and an arbitrary subwave structure is located with a state in which a distance between the arbitrary subwave structure and one of the subwave structures closest to the arbitrary subwave structure is shorter than ½ of an average wavelength of the light beam incident on the optical surface.
Inventors:
Kazumi Kimura
Application Number:
JP2005011713A
Publication Date:
January 12, 2011
Filing Date:
January 19, 2005
Export Citation:
Assignee:
Canon Inc
International Classes:
G02B26/10; G02B1/11
Domestic Patent References:
| JP2003270569A | ||||
| JP2003185955A | ||||
| JP2004085831A | ||||
| JP2003114316A |
Attorney, Agent or Firm:
Yukio Takanashi