公开(公告)号：US20150069128A1

公开(公告)日：2015-03-12

申请号：US14394894

申请日：2013-03-11

Applicant: NHK SPRING CO., LTD.

Inventor： Hidekazu Hoshino ,  Itsuo Takeuchi ,  Shinsuke Yoshida ,  Seiya Shibuya ,  Tohru Ida ,  Syuhei Okubo

IPC: G06K7/10 ,  G03H1/00

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 in which a right circularly polarized light filter is arranged in front of an LED, a light emitting part in which a right circularly polarized light filter is arranged in front of an LED, and a controlling part which switches light emission between the light emitting parts.

Abstract translation: 光学读取装置认证具有胆甾醇型液晶层的识别介质，其具有不需要可移动部件来切换圆形圆偏振光滤光器的结构。 光学读取装置从具有全息图处理的胆甾型液晶层的识别介质和墨水印刷图案层依次读取图像，并且该装置包括其中布置有右圆偏振滤光器的发光部分 在LED的前方，在LED的前方配置有右圆偏光滤光器的发光部，以及在发光部之间切换发光的控制部。