Invention Grant
- Patent Title: Discrimination medium comprising a liquid crystal layer acting as a half-wave plate wherein a gradation of gradual or continuous color changes are displayed according to an area
- Patent Title (中): 鉴别介质包括用作半波片的液晶层，其中根据区域显示渐变或连续颜色变化的渐变
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Application No.: US12225479Application Date: 2007-03-30
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Publication No.: US08279394B2Publication Date: 2012-10-02
- Inventor: Hidekazu Hoshino , Itsuo Takeuchi , Suzushi Nishimura , Gorou Suzaki
- Applicant: Hidekazu Hoshino , Itsuo Takeuchi , Suzushi Nishimura , Gorou Suzaki
- Applicant Address: JP Yokohama-Shi JP Tokyo
- Assignee: NHK Spring Co., Ltd.,Nippon Oil Corporation
- Current Assignee: NHK Spring Co., Ltd.,Nippon Oil Corporation
- Current Assignee Address: JP Yokohama-Shi JP Tokyo
- Agency: Oliff & Berridge, PLC
- Priority: JP2006-101907 20060403
- International Application: PCT/JP2007/057293 WO 20070330
- International Announcement: WO2007/116844 WO 20071018
- Main IPC: C09K19/02
- IPC: C09K19/02 ; G02F1/1335
Abstract:
An object of the present invention is to provide a discrimination medium which has high discrimination ability, and which is more difficult to counterfeit than conventional discrimination mediums. A discrimination medium comprises: a cholesteric liquid crystal layer; and a liquid crystal layer acting as a half-wave plate and provided on the cholesteric liquid crystal layer in a predetermined pattern.
Public/Granted literature
- US20090128772A1 Discrimination Medium, Discrimination Method, and Discrimination Apparatus Public/Granted day:2009-05-21
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