US 11,885,984 B2
Aerial image display device
Motohiro Makiguchi, Tokyo (JP); and Hideaki Takada, Tokyo (JP)
Assigned to Nippon Telegraph and Telephone Corporation, Tokyo (JP)
Appl. No. 16/982,659
Filed by Nippon Telegraph and Telephone Corporation, Tokyo (JP)
PCT Filed Apr. 11, 2019, PCT No. PCT/JP2019/015734
§ 371(c)(1), (2) Date Sep. 21, 2020,
PCT Pub. No. WO2019/198780, PCT Pub. Date Oct. 17, 2019.
Claims priority of application No. 2018-076627 (JP), filed on Apr. 12, 2018.
Prior Publication US 2021/0116718 A1, Apr. 22, 2021
Int. Cl. G02B 30/56 (2020.01); G02B 27/28 (2006.01)
CPC G02B 30/56 (2020.01) [G02B 27/281 (2013.01)] 3 Claims
OG exemplary drawing
 
1. An aerial image display device comprising:
a housing including a first viewing direction facing inward from an outside of one end and a second viewing direction facing inward from an outside of an other end;
a first display unit disposed to be spaced from a top surface on a side of the one end of the housing at a first interval with a display surface facing the housing;
a second display unit disposed to be spaced from a top surface on a side of the other end of the housing at a second interval with a display surface facing the housing;
a first optical element having a plane, a size of which is larger than a size of the first display unit in plan view, disposed to be inclined toward the side of the one end, and configured to transmit a portion of light emitted from the first display unit and reflect a portion of the light;
a second optical element having a plane, a size of which is larger than a size of the second display unit in plan view, disposed to be inclined toward the side of the other end, and configured to transmit a portion of light emitted from the second display unit and reflect a portion of the light; and
a third optical element disposed outside a lower surface of the housing, and configured to transmit a portion of the light emitted from the first display unit and the second display unit and reflect a portion of the light;
wherein sizes of the first interval and the second interval are different.