公开(公告)号：EP2840417A1

公开(公告)日：2015-02-25

申请号：EP13778310.6

申请日：2013-03-11

Applicant: NHK Spring Co.,Ltd.

Inventor： HOSHINO, Hidekazu ,  TAKEUCHI, Itsuo ,  YOSHIDA, Shinsuke ,  SHIBUYA, Seiya ,  IDA, Tohru ,  OKUBO, Syuhei

IPC: G02B5/30 ,  B42D15/10 ,  G02B5/32

CPC classification number: G06K7/1094 ,  B42D25/29 ,  B42D25/328 ,  B42D25/364 ,  B42D2033/26 ,  G02B27/021 ,  G03H1/0011

Abstract: An optical reading device authenticates an identification medium with cholesteric liquid crystal layer, having a structure in which no movable parts are necessary for switching circular circularly polarized light filter. The optical reading device reads an image from an identification medium having a cholesteric liquid crystal layer having a hologram processed, and an ink printed pattern layer in this order, and the device includes a light emitting part 12 in which a right circularly polarized light filter 14 is arranged in front of an LED 20, a light emitting part 13 in which a right circularly polarized light filter 17 is arranged in front of an LED 21, and a controlling part 26 which switches light emission between the light emitting parts 12 and 13.