Invention Grant
- Patent Title: Hologram, detection device, and method for verifying authenticity of hologram
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Application No.: US16938204Application Date: 2020-07-24
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Publication No.: US11662689B2Publication Date: 2023-05-30
- Inventor: Soko Koda , Akihito Kagotani , Tomoyuki Shirasaki , Noriko Harashima
- Applicant: TOPPAN PRINTING CO., LTD.
- Applicant Address: JP Tokyo
- Assignee: TOPPAN PRINTING CO., LTD.
- Current Assignee: TOPPAN PRINTING CO., LTD.
- Current Assignee Address: JP Tokyo
- Agency: Foley & Lardner LLP
- Priority: JP 2018021399 2018.02.08
- Main IPC: G03H1/00
- IPC: G03H1/00 ; G02B5/32 ; G03H1/02 ; G03H1/08 ; G03H1/22

Abstract:
A hologram that includes a formation layer and a reflection layer that are laminated. The formation layer has an optical phase modulation structure on a first interface in contact with the reflection layer. When reference light emitted from a point light source enters through a second interface different from the first interface of the formation layer, the entirety or part of an image to be reconstructed by the optical phase modulation structure is reconstructed as spatial information on the point light source side relative to the second interface.
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