Title:
積層型回折光学素子および光学系
Document Type and Number:
Japanese Patent JP5496258
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a laminate type diffractive optical element in which a chromatic aberration caused by diffraction is reduced while imparting a strong power to a laminate type diffractive optical element.SOLUTION: A laminate type diffractive optical element is configured by laminating a plurality of diffraction gratings. In the laminate type diffractive optical element, individual lattice surfaces 11 and 12 of a plurality of diffraction gratings have a blazed structure in mutually different shapes according to mutually different specific wavelengths. Mutually different translucent mediums 41, 42, and 43 are arranged on the light incident side and the light emission side of each of the lattice surfaces. Each of the translucent mediums has dispersion characteristics in which the refractive index with respect to the specific wavelength of the translucent medium arranged on the light incident side and the light emission side of the lattice surface corresponding to a specific wavelength is mutually different and the refractive index with respect to the specific wavelength of the translucent medium arranged on the light incident side and the light emission side of a lattice surface other than the lattice surface corresponding to the specific wavelength is mutually equal.
Inventors:
Kenichi Saito
Kazutaka Inoguchi
Kazutaka Inoguchi
Application Number:
JP2012131570A
Publication Date:
May 21, 2014
Filing Date:
June 11, 2012
Export Citation:
Assignee:
Canon Inc
International Classes:
G02B5/18; G02B13/00; G02B13/18; G02B17/08; G11B7/135
Domestic Patent References:
| JP2007149249A | ||||
| JP2002318306A | ||||
| JP11064616A | ||||
| JP2001290017A | ||||
| JP2002350625A | ||||
| JP2004030724A | ||||
| JP2006085756A | ||||
| JP2006073042A | ||||
| JP2007333957A | ||||
| JP2009093795A | ||||
| JP2008511019A | ||||
| JP2005116147A | ||||
| JP2006012393A |
Foreign References:
| WO2003079061A1 | ||||
| WO2004044905A1 | ||||
| WO2007069660A1 |
Attorney, Agent or Firm:
Ryosuke Fujimoto
Atsushi Mizumoto
Atsushi Mizumoto