Title:
LIGHT GUIDE FILM, FORGERY PREVENTION STRUCTURE AND FORGERY PREVENTION ARTICLE
Document Type and Number:
WIPO Patent Application WO/2018/105750
Kind Code:
A1
Abstract:
A light guide film whereby a pattern of light emitted from an emission part can be displayed in a desired color or as a multicolor image, and a forgery prevention function can be stably fulfilled, the light guide film being provided with: a support film; and a diffraction structure layer located on one surface of the support film, wherein with a region having a predetermined width from the center of the support film of the diffraction structure layer being defined as an incidence region, and a region having a predetermined width from the end side of the support film being defined as an emission region, the incidence region and/or the emission region has a diffraction grating, and the diffraction grating has recesses and protrusions in the thickness direction of the support film.
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Inventors:
AOYAMA YUKO (JP)
SATO JUN (JP)
SATO JUN (JP)
Application Number:
PCT/JP2017/044282
Publication Date:
June 14, 2018
Filing Date:
December 11, 2017
Export Citation:
Assignee:
DAINIPPON PRINTING CO LTD (JP)
International Classes:
G02B5/18; B42D25/328; G02B5/00; G07D7/12
Foreign References:
| US20120162771A1 | 2012-06-28 | |||
| US20120162770A1 | 2012-06-28 | |||
| US20100315713A1 | 2010-12-16 | |||
| US20130056972A1 | 2013-03-07 | |||
| JP2007203568A | 2007-08-16 | |||
| JP2005019066A | 2005-01-20 |
Attorney, Agent or Firm:
OTA Masataka (JP)
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