PHASE-TYPE DIFFRACTION ELEMENT, MANUFACTURING METHOD THEREOF, AND IMAGE PICKUP APPARATUS

WIPO Patent Application WO/2010/095568

A1

A phase-type diffraction element comprises a transparent substrate (2) having a front surface and a rear surface, and solid liquid crystal layer (3) which is provided on the front surface of the transparent substrate and is comprised of a continuous layer containing at least a liquid crystal compound. The solid liquid crystal layer is comprised of periodically arranged first areas (3a) and second areas (3b) and third areas (3m) formed between the first and second areas. The first areas are optically anisotropic, the second areas are optically isotropic, and the third areas are not optically isotropic. The degree of orientation of a mesogen of the liquid crystal compound is lower in the third areas than in the first areas. The in-plane mean refractive index ni and the in-plane mean refractive index na of the first areas are different from one another, and the third areas have an in-plane mean refractive index nm between the indices ni and na.

AKAO SOSUKE (JP)
ITOI TAKESHI (JP)

PCT/JP2010/052061

August 26, 2010

February 12, 2010

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TOPPAN PRINTING CO LTD (JP)
AKAO SOSUKE (JP)
ITOI TAKESHI (JP)

G02B5/18; G02B5/30; G02B27/46

WO2008004570A1

2008-01-10

JPH09288206A	1997-11-04
JPS63205605A	1988-08-25
JP3592383B2	2004-11-24
JP2007093918A	2007-04-12
JPH049803A	1992-01-14
JP3490214B2	2004-01-26
JP3965732B2	2007-08-29
JPH0451740B2	1992-08-19

SUZUYE, Takehiko et al. (JP)
Takehiko Suzue (JP)

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