US 11,914,145 B2
Floating hologram system using holographic optical element
Seung Hyun Lee, Namyangju (KR); Lee Hwan Hwang, Incheon (KR); Jae Hyun Lee, Seoul (KR); Sung Jae Ha, Seoul (KR); Soon Chul Kwon, Seoul (KR); and Kwang Pyo Hong, Seoul (KR)
Assigned to KWANGWOON UNIVERSITY INDUSTRY-ACADEMIC COLLABORATION FOUNDATION, Seoul (KR)
Appl. No. 17/285,851
Filed by KWANGWOON UNIVERSITY INDUSTRY-ACADEMIC COLLABORATION FOUNDATION, Seoul (KR)
PCT Filed Dec. 10, 2020, PCT No. PCT/KR2020/018002
§ 371(c)(1), (2) Date Apr. 15, 2021,
PCT Pub. No. WO2022/124446, PCT Pub. Date Jun. 16, 2022.
Claims priority of application No. 10-2020-0171264 (KR), filed on Dec. 9, 2020.
Prior Publication US 2022/0397761 A1, Dec. 15, 2022
Int. Cl. G03H 1/22 (2006.01); G02B 27/01 (2006.01); G02B 5/32 (2006.01)
CPC G02B 27/0103 (2013.01) [G02B 5/32 (2013.01); G03H 1/2205 (2013.01); G03H 2001/2213 (2013.01); G03H 2223/14 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A floating hologram system comprising:
a diffuser configured to form a projection image using light beams transmitted from an image transmitter and configured to diffuse the formed image; and
a holographic optical element on which the image diffused from the diffuser is incident and which generates a virtual image floating at a position a predetermined distance therefrom and has a convex lens characteristic,
wherein a distance between the diffuser and the holographic optical element is determined based on a focal length of the holographic optical element and a distance from the holographic optical element to the virtual image, wherein a size (Lv) of the virtual image is determined based on a size (Ld) of the image formed by the diffuser, the focal length (doh) of the holographic optical element, and the distance (dvh) from the holographic optical element to the virtual image according to an equation of

OG Complex Work Unit Math