Invention Grant
- Patent Title: Color display, authentication medium, and method of determining authenticity of color display
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Application No.: US17699665Application Date: 2022-03-21
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Publication No.: US11977938B2Publication Date: 2024-05-07
- Inventor: Keitaro Sugihara , Akihito Kagotani
- Applicant: TOPPAN INC.
- Applicant Address: JP Tokyo
- Assignee: TOPPAN INC.
- Current Assignee: TOPPAN INC.
- Current Assignee Address: JP Tokyo
- Agency: Foley & Lardner LLP
- Priority: JP 19174228 2019.09.25
- Main IPC: G06K19/06
- IPC: G06K19/06 ; G02B5/20

Abstract:
A forming mold has a surface in contact with a deposited film, a part or an entire part being a first wavy surface. A wave period of the first wavy surface is in a range of 250 nm or more and 500 nm or less. The deposited film conforms to the surface of the forming mold. The first wavy surface includes a plurality of rib surfaces, a plurality of groove surfaces, and a plurality of taper surfaces connecting the rib surfaces to the respective groove surfaces. The deposited film has a peak zone, a valley zone, and a transition zone. One of the peak zone, the valley zone, and the transition zone and another one of the peak zone, the valley zone, and the transition zone are different or has portions different in thickness and/or volume density.
Public/Granted literature
- US20220215215A1 COLOR DISPLAY, AUTHENTICATION MEDIUM, AND METHOD OF DETERMINING AUTHENTICITY OF COLOR DISPLAY Public/Granted day:2022-07-07
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