Invention Grant
- Patent Title: Manufacturing method for sheet with anti-counterfeit functions
- Patent Title (中): 具有防伪功能的片材制造方法
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Application No.: US11280735Application Date: 2005-11-17
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Publication No.: US07742136B2Publication Date: 2010-06-22
- Inventor: Seiji Umemoto , Miki Shiraogawa , Takahiro Fukuoka , Naoki Takahashi , Kentarou Takeda
- Applicant: Seiji Umemoto , Miki Shiraogawa , Takahiro Fukuoka , Naoki Takahashi , Kentarou Takeda
- Applicant Address: JP Ibaraki-Shi, Osaka
- Assignee: Nitto Denko Corporation
- Current Assignee: Nitto Denko Corporation
- Current Assignee Address: JP Ibaraki-Shi, Osaka
- Agency: Westerman, Hattori, Daniels & Adrian, LLP
- Priority: JP2004-337473 20041122
- Main IPC: G02F1/1335
- IPC: G02F1/1335 ; C09K19/02

Abstract:
A sheet with anti-counterfeit functions for making counterfeiting highly difficult in the case where authentication information is recorded using the properties of cholesteric liquid crystal is provided. A cholesteric liquid crystal layer 110 having a selective reflected wavelength band in at least the visible light region is provided in such a manner that this cholesteric liquid crystal layer 110 is a single layer of which thickness is approximately uniform, and an authentication region 112 of which selective reflected wavelength band is different is provided in at least one place. Preferably, an adhesive layer 130 is provided on one side of the cholesteric liquid crystal layer 110. Preferably, a base 120 is provided between the cholesteric liquid crystal layer 110 and the adhesive layer 130. Preferably, a light absorbing layer 140 is provided on adhesive layer 130 of the cholesteric liquid crystal layer 110.
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