Image photography method, image photography play method, spatial lighting modulator, image play device, and digital hologram forming device

Patent metadata

Field	Value
Publication number	US-10108147-B2
Application number	US-201214122188-A
Country	US
Kind code	B2
Filing date	May 31, 2012
Priority date	May 31, 2011
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

An image photography play method which is suited to playing a stereoscopic video. The image photography method includes: a step of forming a hologram pattern from a reference light and a subject light; a step of digitally processing the obtained hologram pattern; a step of writing the digitized hologram pattern as a magnetized vector pattern to a spatial lighting modulator which is formed from a magneto-optical material; and a step of inputting linearly polarized light into the spatial lighting modulator and playing an image according to the digitized hologram pattern.

First claim

The invention claimed is:

1. A digital hologram-forming device, wherein a hologram represents stereoscopic images with full-parallax, the device comprising:
a first spatial light modulator, comprising a stereoscopic image formation surface provided by a magneto-optical material,
wherein the stereoscopic image formation surface has magnetic moments aligned perpendicularly to the surface,
wherein the stereoscopic image formation surface includes a first region having a first magnetic moment pointing in a first direction and a second region having a second magnetic moment pointing in a second direction opposite to the first direction,
wherein minimum widths of the first region and the second region are equal to or less than 1 μm; and
wherein the first spatial light modulator is configured to modulate light incident thereon via a thermomagnetic effect, caused in said magneto-optical material by illuminating said magneto-optical material with a light beam; and

a magnetic moment inverting device configured to supply heat to at least portions of the first region and the second region to invert magnetic moments of the stereoscopic image formation surface at the at least portions supplied with the heat, wherein
the magnetic moment inverting device is configured to operate as a second spatial light modulator to reflect the light beam carrying the heat to form a reflected light beam incident on the first spatial light modulator.

2. The digital hologram forming device according to claim 1 further comprising:
a polarizer that faces the stereoscopic image formation surface of the spatial light modulator.

3. A digital hologram forming device according to claim 1 , wherein:
the first spatial light modulator is formed as a translucent sheet of said magneto-optical material having first and second surfaces,
the stereoscopic image formation surface is the first surface, and
each of the first and second magnetic moments are maintained at any point between the first and second surfaces;

and
the magnetic moment inverting device is configured to impinge the reflected light beam to the second surface,
to supply the heat to the second surface of the first spatial light modulator to reverse first and second magnetic moments in the first region and the second region of the first surface.

4. A digital hologram forming device comprising:
a first spatial light modulator having a stereoscopic image formation surface provided by a magneto-optical material,
wherein the stereoscopic image formation surface has magnetic moments, axes of which are aligned in a direction perpendicular to the surface,
wherein the stereoscopic image formation surface includes a first region having a first magnetic moment aligned in a first direction and a second region having a second magnetic moment aligned in a direction opposite to the first direction, and
wherein minimum widths of the first region and the second region are equal to or less than 1 μm; and
wherein the first spatial light modulator is configured to modulate light incident thereon via a thermomagnetic effect, caused in said magneto-optical material by illuminating said magneto-optical material with a light beam;

a magnetic moment inverting device configured to supply heat to the stereoscopic image formation surface to at least portions of the first region and the second region to invert magnetic moments of the stereoscopic image formation surface at the at least portions supplied with the heat, wherein
the magnetic moment inverting device is configured to operate as a second spatial light modulator to reflect the light beam carrying the heat to form a reflected light beam incident on the first spatial light modulator.

5. A digital hologram-forming device comprising:
a first spatial light modulator (SLM) including a layer of magneto-optical (MO) material, said layer being structured to define a plurality of first and second regions sized to be sub-micron in dimensions,
wherein the first and second regions are respectively characterized by first and second magnetic momenta that point in opposite directions and that are substantially perpendicular to a surface of the layer, and
wherein said first SLM is structured to have the first and second magnetic momenta changed via a thermomagnetic effect, caused in said magneto-optical material by illuminating said magneto-optical material with an energy beam;

a second SLM in radiative communication with the first SLM, the second SLM configured
to reflect the energy beam directed thereto to form a reflected energy beam, and
to deliver the reflected energy beam onto an area within limits of a first region or a second region from, said first and second regions, to produce results of the thermomagnetic effect in said layer.

6. A device according to claim 5 ,
wherein the first SLM is configured as an optically-translucent sheet of material,
wherein the first and second magnetic momenta are maintained throughout a thickness of the sheet, and
wherein said first SLM is structured to have the first and second magnetic momenta changes due to heat carried in said reflected energy beam and delivered, respectively, to the first and second regions.

Assignees

• Inoue Mitsuteru
• Takagi Hiroyuki
• National Univ Corporation Toyohashi Univ Of Technology

Inventors

• Inoue Mitsuteru
• Takagi Hiroyuki

Classifications

• G03H2240/25

  Magnetic variations · CPC title

• G03H1/0891

  Processes or apparatus adapted to convert digital holographic data into a hologram (G03H1/2294 takes precedence) · CPC title

• G03H2222/31

  Polarised light · CPC title

• G03H2260/35

  Rewritable material allowing several record and erase cycles · CPC title

• G03H1/0866

  Digital holographic imaging, i.e. synthesizing holobjects from holograms · CPC title