Device and method for printing dual holographic

Patent metadata

Field	Value
Publication number	US-2025383628-A1
Application number	US-202418796824-A
Country	US
Kind code	A1
Filing date	Aug 7, 2024
Priority date	Jun 18, 2024
Publication date	Dec 18, 2025
Grant date	—

Abstract

The present disclosure relates to a device for printing dual holographic, including a plurality of lasers that represents different wavelengths, a plurality of dichroic lenses and mirrors that combine beams output from the plurality of lasers into one beam and output the combined beam as a white beam, a plurality of beam splitters that separates the white beams output through the plurality of dichroic lenses and mirrors, transmit the separated white beams to a stereogram printing device, a wavefront printing device, and a reference beam, separates a beam heading to the reference beam, and transmits the separated beam to the stereogram printing device and the wavefront printing device, and a computer that controls the stereogram printing device and the wavefront printing device so that a hologram is printed with the beam transmitted through the beam splitters.

First claim

What is claimed is:

1 . A device for printing dual holographic, comprising:
a plurality of lasers that represents different wavelengths; a plurality of dichroic lenses and mirrors that combine beams output from the plurality of lasers into one beam and output the combined beam as a white beam; a plurality of beam splitters that separates the white beams output through the plurality of dichroic lenses and mirrors, transmits the separated white beams to a stereogram printing device, a wavefront printing device, and a reference beam, separates a beam heading to the reference beam, and transmits the separated beam to the stereogram printing device and the wavefront printing device; and a computer that controls the stereogram printing device and the wavefront printing device so that a hologram is printed with the beam transmitted through the beam splitters.

2 . The device according to claim 1 , wherein the plurality of lasers includes three first to third lasers that output beams of different wavelengths representing R, G, and B, and each of the first to third lasers outputs beams having wavelengths of 660 nm, 532 nm, and 473 nm.

3 . The device according to claim 1 , further comprising:
a plurality of acousto-optic modulators that is disposed in front of the plurality of lasers, connected to the computer, and controlled by the computer.

4 . The device according to claim 2 , wherein the plurality of dichroic lenses is disposed in front of each of the first and second lasers and passes the beams output from each of the first and second lasers to refract the beams in a specific direction,
the mirror is disposed in front of the third laser and reflects the beam output from the third laser in the specific direction, and the beam that passes through the plurality of dichroic lenses and the beam reflected by the mirror are synthesized into one light.

5 . The device according to claim 1 , wherein the plurality of beam splitters includes:
a first beam splitter that splits the beam reflected through the mirror and transmits the split beam to the stereogram printing device; a second beam splitter that splits the beam passing through the first beam splitter and transmits the split beam to the wavefront printing device; and a third beam splitter that splits the beam that passes through the second beam splitter and transmits the reference beam to the stereogram printing device and the wavefront printing device, respectively.

6 . The device according to claim 1 , wherein the computer controls a first automatic ND filter and a first shutter of the stereogram printing device and a second automatic ND filter and a second shutter of the wavefront printing device to perform holographic stereogram printing or holographic wavefront printing.

7 . The device according to claim 6 , wherein, in order for the holographic stereogram printing to be performed in a first spatial light modulation device, the computer activates the first automatic ND filter among the deactivated first and second automatic ND filters to a maximum value, and activates the first shutter among the deactivated first and second shutters while displaying images corresponding to specific coordinates of Hogel which is an elemental hologram to expose a holographic medium to a light for a specific exposure time.

8 . The device according to claim 7 , wherein after exposing the holographic medium to the light for the specific exposure time, the computer deactivates the first automatic ND filter and the first shutter, and then moves an XY stage to record the elemental hologram at next coordinates of the specific coordinate.

9 . The device according to claim 6 , wherein, in order to for the holographic wavefront printing to be performed in a second spatial light modulation device, the computer activates the second automatic ND filter among the deactivated first and second automatic ND filters to a maximum value, and activates the second shutter among the deactivated first and second shutters while displaying images corresponding to specific coordinates of an elemental hologram to expose a holographic medium to a light to for a specific exposure time.

10 . The device according to claim 9 , wherein after exposing the holographic medium to the light for the specific exposure time, the computer deactivates the second spatial light modulation device and the second shutter, and then moves an XY stage to record the elemental hologram at next coordinates of the specific coordinate.

11 . The device according to claim 6 , wherein, in order for the holographic stereogram printing and the holographic wavefront printing to be performed in a first and second spatial light modulation devices, the computer activates the first automatic ND filter among the deactivated first and second automatic ND filters to a maximum value, and activates the first shutter among the deactivated first and second shutters while displaying images corresponding to specific coordinates of an elemental hologram to expose a holographic medium to a light for a specific exposure time.

12 . The device according to claim 11 , wherein after exposing the holographic medium to the light for the specific exposure time, the computer deactivates the first spatial light modulation device and the first shutter, activates the second automatic ND filter among the deactivated first and second automatic ND filters to the maximum value, and activates the second shutter among the deactivated first and second shutters while displaying images corresponding to specific coordinates of an elemental hologram to expose a holographic medium to a light for a specific exposure time.

13 . The device according to claim 12 , wherein after exposing the holographic medium to the light for the specific exposure time, the computer deactivates the second spatial light modulation device and the second shutter, and then moves an XY stage to record the elemental hologram at next coordinates of the specific coordinate.

Assignees

• Univ Kwangwoon Ind Acad Collab

Inventors

• Lee Seunghyun
• Hwang Leehwan

Classifications

• G03H2001/2695

  Dedicated printer · CPC title

• G03H2001/269

  Two and more than two steps recording process · CPC title

• G03H2001/2685

  One step recording process · CPC title

• G03H2001/0482

  Interference based printer · CPC title

• G03H2001/048

  Parallel printer, i.e. a fringe pattern is reproduced · CPC title