Title:
光学要素、積層体、冊子体
Document Type and Number:
Japanese Patent JP7003931
Kind Code:
B2
Abstract:
Provided are an optical element, a laminate body, and a book form having improved security. The optical element 40 is equipped with a hologram layer 41 on which a hologram image 41b is recorded, and a diffraction grating layer 50 laminated under the hologram layer 41. The diffraction grating layer 50 is equipped with a diffraction grating 52a having recesses and protrusions in the thickness direction. In addition, a card 1 is equipped with this optical element 40.
Inventors:
Takumi Motoi
Yuko Masuyama
Jun Sato
Yuko Masuyama
Jun Sato
Application Number:
JP2018547823A
Publication Date:
January 21, 2022
Filing Date:
October 30, 2017
Export Citation:
Assignee:
Dai Nippon Printing Co.,Ltd.
International Classes:
G03H1/02; B32B7/023; B42D25/23; B42D25/24; B42D25/328; G02B5/18; G07D7/12
Domestic Patent References:
| JP2012071477A | ||||
| JP2007203568A | ||||
| JP2005189168A | ||||
| JP2016510431A |
Foreign References:
| US20130056972 | ||||
| US20030038239 | ||||
| US20100060989 |
Attorney, Agent or Firm:
Masayuki Masabayashi
Tetsuo Shiba
Hayashi Kazuyoshi
Tetsuo Shiba
Hayashi Kazuyoshi