公开(公告)号：US10295830B2

公开(公告)日：2019-05-21

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: G02B26/00 ,  G02B27/09 ,  H01S3/00

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.

公开(公告)号：US11852847B2

公开(公告)日：2023-12-26

申请号：US16969666

申请日：2018-02-13

Applicant: Korea Electronics Technology Institute

Inventor： Young Min Kim ,  Ji Soo Hong ,  Hoon Jong Kang ,  Sung Hee Hong ,  Choon Sung Shin

IPC: G02B26/08 ,  G02B30/33 ,  G02B27/30

CPC classification number: G02B30/33 ,  G02B26/0816 ,  G02B27/30

Abstract: Provided is a Maxwellian view display which uses a space-time multiplexing scheme and widens a field of view, thereby having a degree of freedom within a set area instead of a fixed position while maintaining the advantage of the existing Maxwellian view, in which a clear image can be observed irrespective of the difference in individual ability for focal point adjustment since the focal point does not need to be adjusted. According to an embodiment of the present invention, a display includes: a light source unit for changing the position of a point light source according to time; a first lens for converting the light emitted from the light source unit to be parallel; an image generating unit for generating an image using the parallel light incident from the first lens; and a second lens for focusing the image generated by the image generating unit.

公开(公告)号：US10609563B2

公开(公告)日：2020-03-31

申请号：US15327375

申请日：2016-01-22

Applicant: Korea Electronics Technology Institute

Inventor： Choon Sung Shin ,  Sung Hee Hong ,  Ji Soo Hong ,  Young Min Kim ,  Hoon Jong Kang ,  Young Choong Park

IPC: G06K19/06 ,  H04W12/12 ,  B29C67/00 ,  B33Y50/02 ,  B33Y80/00 ,  G06K19/14 ,  G06K19/10 ,  G01V15/00 ,  G06K9/00 ,  H04W12/06

Abstract: A method for inserting information into a 3D structure and recognizing information in a non-destructive method is provided. A 3D printing method according to an exemplary embodiment of the present invention includes: generating a tag having specific information recorded thereon to be inserted into a 3D structure, and printing the tag on the inside of the 3D structure while printing the 3D structure. Accordingly, since the tag having information recorded thereon is printed on the inside of the 3D structure when the 3D structure is printed by a 3D printer, it is impossible to forge/falsify information.