US 12,189,125 B2
Virtual image display device and optical unit
Takashi Takeda, Suwa (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Aug. 27, 2021, as Appl. No. 17/458,937.
Claims priority of application No. 2020-144250 (JP), filed on Aug. 28, 2020.
Prior Publication US 2022/0066217 A1, Mar. 3, 2022
Int. Cl. G02B 27/01 (2006.01); G02B 27/09 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 27/0983 (2013.01); G02B 2027/013 (2013.01); G02B 2027/0174 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A virtual image display device comprising:
an image generation device;
a concave transmissive mirror configured to reflect image light emitted from the image generation device; and
a shade element having a partial reflective surface at an external side of the shade element, and comprising a light superimposer provided on an external side of a partial reflective film provided at the concave transmissive mirror, wherein
the light superimposer is an external light reflective film,
external light incident from the external side of the shade element is reflected in a wavelength range of the image light and is emitted as additional light in an external direction of the shade element,
the image light partially passed through the concave transmissive mirror impinges on an inside surface of the shade element,
a first portion of the image light passed through the concave transmissive mirror is reflected by the external light reflective film, and a second portion of the image light passed through the concave transmissive mirror is emitted as leaked light in the external direction of the shade element, and
the light superimposer is configured to superimpose the additional light in a visible range on the image light transmitted through the partial reflective film as the leaked light such that the leaked light is hidden in the additional light.