Title:
DIFFRACTION GRATING AND OPTICAL SYSTEM INCLUDING THE DIFFRACTION GRATING
Document Type and Number:
WIPO Patent Application WO/2006/038535
Kind Code:
A1
Abstract:
There is provided a diffraction grating for effectively diffracting three light rays having different wavelengths. The diffraction grating has a constant cyclic stepwise shape. The first light ray has a wavelength shorter than that of a second light ray. The second light ray has a wavelength shorter than that of a third light ray. Each of the wavelengths of the first, the second, and the third light ray corresponds to a different one of the wavelengths indicating the peak of the diffraction efficiency of the first degree diffracted light, 0-th degree diffracted light, and a minus first degree diffracted light. When it is assumed that the constant cycle is 10 micrometers, the diffraction efficiency of the first, the second, and the third light ray incident vertically to the diffraction grating surface is 50% or above.
Inventors:
HATADE KOUEI (JP)
SAKAGAMI NORIHISA (JP)
SAKAGAMI NORIHISA (JP)
Application Number:
PCT/JP2005/018029
Publication Date:
April 13, 2006
Filing Date:
September 29, 2005
Export Citation:
Assignee:
NALUX CO LTD (JP)
HATADE KOUEI (JP)
SAKAGAMI NORIHISA (JP)
HATADE KOUEI (JP)
SAKAGAMI NORIHISA (JP)
International Classes:
G02B5/18; G11B7/135; G11B7/125
Foreign References:
| JP2002100070A | 2002-04-05 | |||
| JP2002237081A | 2002-08-23 | |||
| JPH10261240A | 1998-09-29 | |||
| JPH0391126A | 1991-04-16 | |||
| JP2001283457A | 2001-10-12 | |||
| JP2001268318A | 2001-09-28 | |||
| JP2003057421A | 2003-02-26 | |||
| JP2002163837A | 2002-06-07 | |||
| JP2005259268A | 2005-09-22 |
Attorney, Agent or Firm:
Fushimi, Naoya (FUSHIMI AND HIRANO PC, NE Kudan Bldg., 2-7,
Kudan-minami 3-chom, Chiyoda-ku Tokyo, JP)
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