Hologram recording device

Patent metadata

Field	Value
Publication number	US-9939782-B2
Application number	US-201615226193-A
Country	US
Kind code	B2
Filing date	Aug 2, 2016
Priority date	Mar 18, 2016
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A hologram recording device includes a light outputting unit, which sequentially outputs laser beams having different wavelengths such that the laser beams are coaxial and includes an optical member and laser beam sources, and a recording unit, which sequentially irradiates the recording medium with the laser beams to record holograms in a multiwavelength superimposing manner. The optical member includes optical elements that reflect, in the optical direction, a laser beam incident thereon in a direction crossing the optical axis direction, and that allow a laser beam incident thereon in the optical axis direction to pass therethrough. The laser beam sources radiate laser beams to the optical member, and are arranged so that a laser beam emitted from a laser beam source among the laser beam sources that exposes a recording medium for a longer exposure period with the laser beam passes through a smaller number of optical elements.

First claim

What is claimed is:

1. A hologram recording device comprising:
a light outputting unit configured to sequentially output a plurality of laser beams having different wavelengths such that the laser beams are coaxial with one another, the light outputting unit including:
an optical member that includes a plurality of optical elements arranged in an optical axis direction, the optical elements configured to reflect, in an optical direction, a first laser beam, of the plurality of laser beams, incident thereon in a direction crossing the optical axis direction, and the optical elements configured to allow a second laser beam, of the plurality of laser beams, incident thereon in the optical axis direction to pass therethrough, and
a plurality of laser beam sources configured to emit the plurality of laser beams having different wavelengths, to radiate the laser beams to the optical member, and that are arranged so that third laser beam, of the plurality of laser beams, emitted from a laser beam source among the laser beam sources exposes a recording medium for a longer exposure period, than at least another of the plurality of laser beams, with the third laser beam passing through a smaller number of optical elements than the at least another of the plurality of laser beams; and

a recording unit configured to sequentially irradiate the recording medium with the laser beams, which have different wavelengths, and which the light outputting unit is configured to sequentially output, so as to be coaxial with one another, for use as recording beams to record a plurality of holograms in a multiwavelength superimposing manner,
wherein the light outputting unit includes:
a first optical element configured to reflect, in the optical axis direction, the first laser beam incident thereon in a first direction, the first optical element is further configured to allow the second laser beam incident thereon in the optical axis direction to pass therethrough and outputting the second laser beam,
a second optical element configured to reflect, in the optical axis direction, a fourth laser beam incident thereon in a second direction and to cause the fourth laser beam to be incident on the first optical element, the second optical element is further configured to allow a fifth laser beam incident thereon in the optical axis direction to pass therethrough and to cause the fifth laser beam to be incident on the first optical element,
a first laser beam source configured to cause the first laser beam to be incident on the first optical element in the first direction,
a second laser beam source configured to cause the fourth laser beam to be incident on the second optical element in the second direction, and
a third laser beam source configured to cause the fifth laser beam to be incident on the second optical element in the optical axis direction,

wherein, in a case in which the first laser beam, the fourth laser beam, and the fifth laser beam are emitted by respective ones of the first laser beam source, the second laser beam source and the third laser beam source, an exposure period for which the recording medium is exposed with the fifth laser beam is greater than the exposure period for which the recording medium is exposed with the fourth laser beam and the exposure period for which the recording medium is exposed with the fourth laser beam is greater than the exposure period for which the recording medium is exposed with the first laser beam, and
wherein the first laser beam source is further configured to emit the first laser beam of a wavelength corresponding to a color blue, the second laser beam source is further configured to emit the fourth laser beam of a wavelength corresponding to a color red, and the third laser beam source is further configured to emit the fifth laser beam of a wavelength corresponding to a color green.

2. The hologram recording device according to claim 1 , wherein the longer exposure period is an exposure period required to acquire a white hologram by additive mixing when at least one of the plurality of laser beams does not cause an optical loss after passing through a corresponding number of optical elements.

Assignees

• Fuji Xerox Co Ltd

Inventors

• Nakamura Shigetoshi
• Minabe Jiro
• Ogasawara Yasuhiro

Classifications

• G03H2001/266

  Wavelength multiplexing · CPC title

• G03H2222/18

  RGB trichrome light · CPC title

• G03H1/0465

  Particular recording light; Beam shape or geometry (G03H1/06 takes precedence) · CPC title

• G03H1/268 Primary

  Holographic stereogram · CPC title

• G03H1/30 Primary

  discrete holograms only · CPC title