公开(公告)号：US10261224B2

公开(公告)日：2019-04-16

申请号：US15368289

申请日：2016-12-02

Applicant: TOPPAN PRINTING CO., LTD.

Inventor： Kazuhiro Yashiki ,  Akira Kubo ,  Chikara Sawamura ,  Haruna Ooki

IPC: G02B5/02 ,  G02B5/08 ,  G02B5/18 ,  B42D25/328

Abstract: An optical element includes a transmission diffraction portion, which reflective portions and transmissive portions. The reflective portions are arranged at equal intervals along a given axis. Each reflective portion reflects light included in the visible light. The light reflected by the reflective portions forms a reflection image. The transmissive portions transmit the visible light. Each transmissive portion is sandwiched by two corresponding reflective portions that are adjacent to each other along the given axis. At least part of each reflective portion forms the reflection image by rendering a reflection angle of the light reflected by the reflective portions different from an angle of light incident on the reflective portions. The transmission diffraction portion forms diffracted images having different colors with diffracted light that is produced by diffracting light transmitted through the transmissive portions in a predetermined direction.