Holographic viewing device, and holographic viewing card incorporating it

Patent metadata

Field	Value
Publication number	US-2017293263-A1
Application number	US-201715586508-A
Country	US
Kind code	A1
Filing date	May 4, 2017
Priority date	Jul 4, 2005
Publication date	Oct 12, 2017
Grant date	—

Abstract

The invention relates to a holographic viewing device that enable printing or the like to be directly applied to a transmission hologram substrate without recourse to any frame for supporting and reinforcing a transmission hologram, thereby simplifying construction while enhancing aesthetic and decorative attributes, and a holographic viewing card incorporating it. The holographic viewing device enables a given image or message to be viewed near the positions of point light sources upon viewing the point light sources through a hologram, and comprises a transparent substrate 41 , a hologram-formation layer 42 and a printing layer 45 . The hologram-formation layer 42 may be any one of a phase type diffractive optical element having a relief structure 43 on its surface, a phase type diffractive optical element having a refractive index profile in its layer, and an amplitude type diffractive optical element having a transmittance profile in its layer.

First claim

What is claimed is:

1 . A holographic viewing device comprising:
a transparent substrate; a hologram-formation layer formed on a first side of the transparent substrate and constructed of a transmission Fourier transform hologram area functioning as a Fourier transform lens and a non-hologram area not functioning as the Fourier transform lens; and a printing layer formed on a second side of the transparent substrate opposite to the first side, the holographic viewing device being structured such that a holographic image or message is visible at each of a plurality of point light sources when the plurality of light sources are viewed through the holographic viewing device, where said hologram-formation layer comprises a phase type diffractive optical element having a relief structure on a surface thereof.

Assignees

• Dainippon Printing Co Ltd

Inventors

• Kitamura Mitsuru
• Ueda Kenji
• Eto Koji

Classifications

• G03H1/16

  using Fourier transform ({G03H1/10}, G03H1/12, G03H1/14 take precedence; analogue computers G06G, e.g. G06G7/19) · CPC title

• G03H2001/2234

  Transmission reconstruction · CPC title

• G03H1/0244

  Surface relief holograms (replicating hologram without interference recording G03H1/0276) · CPC title

• G03H2001/0055

  in advertising or decorative art · CPC title

• G03H1/08

  Synthesising holograms, {i.e. holograms synthesized from objects or objects from holograms}(using electric digital computers G06F; G06T) · CPC title