IDENTIFYING MEDIUM, IDENTIFYING MEDIUM MANUFACTURING METHOD, ARTICLE AND IDENTIFYING MEDIUM IDENTIFYING METHOD

WIPO Patent Application WO/2008/018560

A1

Provided is an identifying medium which can utilize a multi-tone latent image at a low cost. An identifying medium (1) is provided with a structure wherein a light reflecting layer (12), a transparent base material (11), an orientation layer (21) and a nematic liquid crystal layer (31) are laminated. In the identifying means, deviation of the thickness distribution of the nematic liquid crystal layer (31) from the thickness that functions as a (1/4) wavelength plate is intentionally controlled, and the thickness distribution corresponds to the contrasting densities of the image. When the identifying medium (1) is directly viewed, the nematic liquid crystal layer (31) cannot be seen and an image cannot be recognized. When the identifying means is observed through a linear polarizing plate, an image (latent image) having contrasting densities corresponding to the thickness distribution of the nematic liquid crystal layer (31) can be recognized.

JP6070354	A manufacturing method of an extension optical film
JP2006513443	Reference plate
JP2000155215	WIDE VIEW ANGULE POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY DEVICE

HOSHINO HIDEKAZU (JP)
TAKEUCHI ITSUO (JP)
NASUBIDA SHINYA (JP)

PCT/JP2007/065653

February 14, 2008

August 09, 2007

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NHK SPRING CO LTD (JP)
HOSHINO HIDEKAZU (JP)
TAKEUCHI ITSUO (JP)
NASUBIDA SHINYA (JP)

G02B5/30; B41M3/14; B42D15/10; G09F3/02

JP2002090533A	2002-03-27
JP2006133385A	2006-05-25
JP2006525139A	2006-11-09
JP2006171259A	2006-06-29
JP2000066136A	2000-03-03
JP2006139178A	2006-06-01

See also references of EP 2056134A4

SUENARI, Mikio (6-13 Kyobashi1-chome, Chuo-k, Tokyo 31, JP)

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