Title:
HOLOGRAM AUTHENTICATION SYSTEM AND HOLOGRAM AUTHENTICATION METHOD
Document Type and Number:
Japanese Patent JP2018025814
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a hologram authentication system capable of easy authenticity determination with a simple structure, a hologram authentication method, and a volume hologram.SOLUTION: A hologram authentication system determines a member to be an authentic volume hologram in the case that a light-emitting part 2 emits light at a second incident angle and a first light receiving part 31 receives a quantity of light equal to or larger than first threshold and a second light receiving part 32 receives a quantity of light equal to or larger than second threshold, and determines the member to be unauthentic in the case that the first light receiving part 31 does not receive light or receives a quantity of light smaller than the first threshold or the case that the second light receiving part 32 does not receive light or receives a quantity of light smaller than a second threshold when the light-emitting part 2 emits light at the second incident angle, and determines the member to be other than the hologram in the case a light receiving part 3 receives a quantity of light smaller than a reference value, the reference value being a quantity of light of the light receiving part 3 that has received light from the light-emitting part 2 reflected by a standard white board, when the light-emitting part 2 emits light.SELECTED DRAWING: Figure 14
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Inventors:
YAMAUCHI TAKESHI
KITAMURA MITSURU
KITAMURA MITSURU
Application Number:
JP2017192663A
Publication Date:
February 15, 2018
Filing Date:
October 02, 2017
Export Citation:
Assignee:
DAINIPPON PRINTING CO LTD
International Classes:
G03H1/22; B42D25/328; G03H1/04
Domestic Patent References:
| JP2010266647A | 2010-11-25 | |||
| JPH05188845A | 1993-07-30 |
Attorney, Agent or Firm:
Takashi Koyama
Teiji Tanaka
Teiji Tanaka