US 9,810,908 B2
Virtual image display device
Yasuo Tanahashi, Kawasaki (JP)
Assigned to PIONEER CORPORATION, Kanagawa (JP)
Appl. No. 14/238,240
Filed by Yasuo Tanahashi, Kawasaki (JP)
PCT Filed Aug. 18, 2011, PCT No. PCT/JP2011/068659
§ 371(c)(1), (2), (4) Date Feb. 20, 2014,
PCT Pub. No. WO2013/024539, PCT Pub. Date Feb. 21, 2013.
Prior Publication US 2014/0218804 A1, Aug. 7, 2014
Int. Cl. G02B 27/14 (2006.01); G02B 27/01 (2006.01); G02B 27/00 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 27/0025 (2013.01); G02B 27/0101 (2013.01); G02B 2027/011 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A virtual image display device comprising:
a light source which emits a light corresponding to an image to be displayed;
an image forming element which forms the image to be displayed; and
an optical element which reflects a light emitted from the image forming element to display a virtual image, the optical element having a concave shape opposite to a traveling direction of the light emitted from the image forming element,
wherein the light emitted from the image forming element enters the optical element without being reflected by another optical element,
wherein the image forming element is an exit-pupil expanding element which expands an exit-pupil of the light irradiated from a light source,
wherein the light source is arranged such that the optical axis of the light emitted from the light source enters the image forming element non-perpendicularly to an incident surface of the image forming element, and
wherein an output surface of the image forming element is arranged in a direction substantially orthogonal to a direction of viewing the virtual image through the optical element.