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1.发明申请公开(公告)号：US20250044739A1
公开(公告)日：2025-02-06
申请号：US18713918
申请日：2021-12-07
Applicant: Korea Electronics Technology Institute
Inventor： Sung Hee HONG , Young Min KIM , Ji Soo HONG
IPC: G03H1/04
Abstract: Provided is a holographic printer using a mechanical shutter having adjustable exposure time and no vibration. The holographic printer according to an embodiment of the present invention comprises: a light source; a modulator for generating a holographic fringe pattern in hogel units; a stage on which a hologram recording medium is placed; a driving part for moving the position of the stage in hogel units; and a shutter for periodically exposing an object light due to the holographic fringe pattern generated by the modulator to the hologram recording medium. The shutter comprises: a rotation plate having formed therein an arc-shaped opening which exposes the object light due to the holographic fringe pattern; and a motor for rotating the rotation plate. Therefore, the exposure period and exposure time of the shutter can be variously adjusted by adjusting the rotational state of the rotation plates having the arc-shaped opening formed therein.
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公开(公告)号：US20240111250A1
公开(公告)日：2024-04-04
申请号：US18013305
申请日：2021-12-15
Applicant: Korea Electronics Technology Institute
Inventor： Ji Soo HONG , Sung Hee HONG , Young Min KIM , Jin Soo JEONG , Byoung Hyo LEE
CPC classification number: G03H1/0476 , G03H1/024 , G03H1/2249 , G03H2001/0224 , G03H2001/0232 , G03H2001/2263
Abstract: Provided is a hologram image normalization method for a holographic printer. In a holographic printing method according to an embodiment, generating, encoding, and normalizing for the (n+1)-th hogel are performed in parallel with loading and recording of a normalized hologram for the n-th hogel, and moving and waiting for the (n+1)-th hogel. Accordingly, a global maximum value and a global minimum value for normalization may be calculated as approximate estimation values, and a hologram generation process and a printing process may be performed in parallel, so that a total printing time may be minimized and memory usage may be optimized when holographic printing is performed.
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3.发明公开公开(公告)号：US20240118661A1
公开(公告)日：2024-04-11
申请号：US18013321
申请日：2021-12-15
Applicant: Korea Electronics Technology Institute
Inventor： Ji Soo HONG , Sung Hee HONG , Young Min KIM , Jin Soo JEONG , Byoung Hyo LEE
IPC: G03H1/04
CPC classification number: G03H1/0476 , G03H2001/0482 , G03H2223/24 , G03H2225/32 , G03H2225/52 , G03H2226/00
Abstract: Provided is a holographic optical element printing method using a tunable focus lens and a rotating mirror. According to an embodiment, a holographic printer includes: a first optical engine and a second optical engine configured to adjust a phase of an incident collimated beam and emit the collimated beam; and a first reduction optical system and a second reduction optical system configured to reduce the beam emitted from the first optical engine and the second optical engine and to allow the beam to enter a holographic material, wherein each of the first optical engine and the second optical engine includes: a rotating mirror configured to reflect while adjusting the phase of the incident collimated beam through rotation; and a tunable focus lens configured to refract while adjusting the phase of the incident collimated beam reflected from the rotating mirror through focus tuning. Accordingly, by using a combination of a tunable focus lens and a rotating mirror, instead of using an SLM of a holographic printer, quality of an HOE may be enhanced, a printing time per hogel may be reduced and a total recording time may be greatly reduced when holographic printing of the HOE is performed.
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公开(公告)号：US20180267324A1
公开(公告)日：2018-09-20
申请号：US15317203
申请日：2015-12-01
Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE
Inventor： Ji Soo HONG , Hoon Jong KANG , Sung Hee HONG , Choon Sung SHIN , Young Min KIM
IPC: G02B27/09
CPC classification number: G02B27/0955 , G02B26/00 , G02B27/0983 , H01S3/0085
Abstract: A laser light source shutter system includes a light source, a variable focus optical element to transmit a beam emitted from the light source, a pinhole located on an optical path through which the beam travels from the variable focus optical element, and a controller to control a transmission and blocking of the beam by controlling a focal length of the variable focus optical element to be equal to a distance between the variable focus optical element and the pinhole or to be equal to other distances different from the distance. Therefore, a laser light source shutter free from vibration can be realized electronically with a low cost and a high light-blocking rate using a variable focus optical element such as a variable focus lens and a variable focus mirror.
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公开(公告)号：US20250044738A1
公开(公告)日：2025-02-06
申请号：US18713782
申请日：2021-12-06
Applicant: Korea Electronics Technology Institute
Inventor： Sung Hee HONG , Young Min KIM , Ji Soo HONG
IPC: G03H1/04
Abstract: A holographic printer using a vibration-free mechanical shutter is provided. A holographic printer, according to an embodiment of the present invention, comprises: a light source which emits light; a modulator which modulates the light emitted from the light source to generate a holographic fringe pattern in a hogel unit; a stage on which a holographic recording medium, on which a holographic fringe pattern generated by the modulator is to be recorded in a hogel unit, is placed; a driving part which moves a position of the stage in a hogel unit; and a shutter which periodically exposes, to the holographic recording medium, object light generated by the holographic fringe pattern generated by the modulator, wherein the shutter includes a rotating plate having a slit that exposes the object light by means of the holographic fringe pattern, and a motor rotating the rotating plate. Accordingly, by applying a mechanical shutter having a structure in which vibration does not occur to the holographic printer, it is possible to prevent degradation of hologram recording quality caused by vibration generated during opening/closing of the shutter.
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Patent Agency Ranking
公开(公告)号：US20240393509A1
公开(公告)日：2024-11-28
申请号：US18343886
申请日：2023-06-29
Applicant: Korea Electronics Technology Institute
Inventor： Ji Soo HONG , Sung Hee HONG , Young Min KIM , Jin Soo JEONG , Yong Hwa KIM , Byoung Hyo LEE , Hyeon Chan OH
Abstract: There is provided a thin optical system for real-world occlusion in an augmented reality display. The optical system according to an embodiment includes: a first DCRA configured to reflect light beams focused on holes; a mask positioned on a light emitting surface of the first DCRA to pass or block the light beams emitted from the first DCRA; and a second DCRA configured to reflect the light beams which are focused on holes after passing through the mask. Accordingly, the optical system can implement real-world occlusion in the unit of pixel while having a thin form factor.
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公开(公告)号：US20230038253A1
公开(公告)日：2023-02-09
申请号：US17781474
申请日：2019-12-06
Applicant: Korea Electronics Technology Institute
Inventor： Ji Soo HONG , Sung Hee HONG , Young Min KIM
Abstract: Provided is a method in which, when configuring an HUD that produces a holographic image at a distance using a holographic optical element (HOE), an HOE capable of correcting aberrations generated by a projection optical system is manufactured and used to improve the quality of an HUD image. A method for manufacturing an HOE for HUD according to an embodiment of the present invention comprises the steps of: measuring aberrations generated by an optical system that projects an image of a display device; recording the measured aberrations in a master HOE; reproducing an aberrated wavefront of the optical system by playing the master HOE on a display plane on which the image of the display device is expressed; and causing an interference of the reproduced aberrated wavefront and a spherical wavefront irradiated from the HUD image plane on which the image of the display device is created, and recording the interference in the HOE. Accordingly, when configuring the HUD producing an image at a distance using the HOE, the quality of the HUD image can be improved by measuring aberrations in the projection optical system, creating a master HOE that reproduces the measured aberrations, and manufacturing a HOE that corrects the aberrations, and correcting aberrations generated in the projection optical system.
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公开(公告)号：US20250093815A1
公开(公告)日：2025-03-20
申请号：US18713785
申请日：2021-12-06
Applicant: Korea Electronics Technology Institute
Inventor： Sung Hee HONG , Young Min KIM , Ji Soo HONG
IPC: G03H1/04
Abstract: A continuous hologram recording method is provided. A holographic printer according to an embodiment of the present invention comprises: a light source that emits light; a modulator that modulates the light emitted from the light source, to generate a holographic fringe pattern in units of hogels; a stage having placed thereon a hologram recording medium on which a holographic fringe pattern generated by the modulator is to be recorded in units of hogels; a first driving unit that moves the position of the stage in a first axial direction by using a first-type motor; and a second driving unit that moves the position of the stage in a second axial direction by using a second-type motor different from the first type. Accordingly, continuous hologram recording is enabled by appropriately implementing a motor that moves the stage on which the hologram recording medium is placed, according to vibration characteristics, thereby remarkably reducing the printing time for large holograms, which used to take several days to tens of days, and thus accelerating the commercialization of hologram printing.
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公开(公告)号：US20250028280A1
公开(公告)日：2025-01-23
申请号：US18713728
申请日：2021-12-06
Applicant: Korea Electronics Technology Institute
Inventor： Sung Hee HONG , Young Min KIM , Ji Soo HONG
Abstract: A method and a system for foveated hologram rendering are provided. A method for foveated hologram rendering according to an embodiment of the present invention comprises: tracking a user's line of sight, rendering a hologram having a first resolution in the user's central line of sight, and rendering a hologram having a resolution lower than the first resolution in the user's peripheral line of sight. Accordingly, a hologram content with high quality and high resolution can be generated and reproduced at high speed through foveated hologram rendering in which holograms having different resolutions are rendered in the user's central line of sight and peripheral line of sight.
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公开(公告)号：US20240028857A1
公开(公告)日：2024-01-25
申请号：US17623221
申请日：2021-12-07
Applicant: Korea Electronics Technology Institute
Inventor： Sung Hee HONG , Young Min KIM , Ji Soo HONG
CPC classification number: G06K19/06037 , G06K19/16 , G06K2207/1015
Abstract: Provided is an uncopyable hologram QR code, According to an embodiment of the present disclosure, a 3D code generation method divides a 2D code having specific information recorded thereon into a plurality of sub 2D codes, and generatES a 3D code by coupling at least one of the divided sub 2D codes at a different depth. Accordingly, a QR code is recorded on a hologram recording medium as a hologram, and is displayed and scanned, so that it is impossible to easily duplicate the QR code unlike an existing 2D QR code.
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