US 11,993,147 B2
Head-up display apparatus
Ken Kawamura, Yokohama (JP)
Assigned to JVCKENWOOD CORPORATION, Yokohama (JP)
Filed by JVCKENWOOD Corporation, Yokohama (JP)
Filed on Jan. 25, 2023, as Appl. No. 18/101,541.
Application 18/101,541 is a continuation of application No. PCT/JP2021/007913, filed on Mar. 2, 2021.
Claims priority of application No. 2020-155196 (JP), filed on Sep. 16, 2020.
Prior Publication US 2023/0166595 A1, Jun. 1, 2023
Int. Cl. B60K 35/00 (2024.01); B60K 35/23 (2024.01)
CPC B60K 35/00 (2013.01) [B60K 35/23 (2024.01); B60K 2360/23 (2024.01); B60K 2360/29 (2024.01); B60K 2360/334 (2024.01)] 6 Claims
OG exemplary drawing
 
1. A head-up display apparatus configured to project a virtual image to be perceived by a user onto a virtual image display part provided in front of the user, comprising:
a display light emitting unit configured to emit display light; and
a display light reflection unit configured to reflect the display light and emit the reflected display light,
wherein the display light reflection unit comprises a mirror part having a concave shape, and a transmissive-type volume hologram part provided on a surface of the mirror part;
wherein the display light reflection unit is set so that an incident angle of the display light from the display light emitting unit when the display light is incident on the mirror part through the transmissive-type volume hologram part is smaller than the incident angle of the display light from the display light emitting unit when the display light is incident on the mirror part without passing through the transmissive-type volume hologram part.