公开(公告)号：EP3637378A1

公开(公告)日：2020-04-15

申请号：EP18805832.5

申请日：2018-05-25

Applicant: Toppan Printing Co., Ltd.

Inventor： MASUDA, Tomohito ,  MIYAMOTO, Eri

IPC: G07D7/121 ,  G02B5/18 ,  G07D7/17 ,  G07D7/206

Abstract: An identification apparatus includes an estimation unit that estimates an operating distance between the surface of an optical device and an imaging unit as an estimated value. A reference distance refers to the distance between a first face of an identification target and the imaging unit and at which light diffracted by a diffraction grating is capable of being recorded by the imaging unit. The identification apparatus includes a first determination unit that determines whether the estimated value matches the reference distance and a second determination unit that determines whether an image captured by the imaging unit matches a reference image. Conditions for identifying the optical device as the identification target include a condition that the first determination unit determines that the estimated value matches the reference distance and a condition that the second determination unit determines that the image captured by the imaging unit matches the reference image. When these conditions are satisfied, the identification apparatus identifies the optical device as the identification target.

公开(公告)号：EP2068208B1

公开(公告)日：2015-03-04

申请号：EP07807874.8

申请日：2007-09-26

Applicant: Toppan Printing Co., Ltd.

Inventor： MIYAMOTO, Eri ,  TODA, Toshiki ,  KISHIMOTO, Yasushi

IPC: B42D25/00

CPC classification number: B42D25/364 ,  B42D25/328 ,  B42D25/373 ,  B42D2033/10 ,  B42D2033/26 ,  G02B5/10 ,  G02B5/1814 ,  G02B5/1861

公开(公告)号：EP2068208A1

公开(公告)日：2009-06-10

申请号：EP07807874.8

申请日：2007-09-26

Applicant: Toppan Printing Co., Ltd.

Inventor： MIYAMOTO, Eri ,  TODA, Toshiki ,  KISHIMOTO, Yasushi

IPC: G03H1/18 ,  B42D15/10

CPC classification number: B42D25/364 ,  B42D25/328 ,  B42D25/373 ,  B42D2033/10 ,  B42D2033/26 ,  G02B5/10 ,  G02B5/1814 ,  G02B5/1861

Abstract: Increased is the variety of changes of an image in accordance with observation conditions displayed on an optical device including a solidified liquid crystal material. An optical device (10) includes a layered structure including a recess-forming layer (13) with light-transmitting property, a main surface of which includes one or more recess-forming regions each provided with first grooves equal in longitudinal directions to one another and adjacent to one another in a direction crossing the longitudinal directions, and a liquid crystal layer (15) supported by the main surface and made of a solidified liquid crystal material, and a reflection layer (12) facing the layered structure.