US 12,287,480 B2
Information display apparatus
Koji Hirata, Kyoto (JP); Masahiko Yatsu, Kyoto (JP); Toshinori Sugiyama, Kyoto (JP); and Kazuomi Kaneko, Ibaraki (JP)
Assigned to MAXELL, LTD., Kyoto (JP); and HITACHI INDUSTRY & CONTROL SOLUTIONS, LTD., Ibaraki (JP)
Filed by MAXELL, LTD., Kyoto (JP); and Hitachi Industry & Control Solutions, Ltd., Ibaraki (JP)
Filed on Feb. 14, 2024, as Appl. No. 18/441,027.
Application 17/714,280 is a division of application No. 16/328,985, granted, now 11,327,303, issued on May 10, 2022, previously published as PCT/JP2017/023187, filed on Jun. 23, 2017.
Application 18/441,027 is a continuation of application No. 18/139,495, filed on Apr. 26, 2023, granted, now 11,933,980.
Application 18/139,495 is a continuation of application No. 17/714,280, filed on Apr. 6, 2022, granted, now 11,675,189, issued on Jun. 13, 2023.
Claims priority of application No. 2016-167819 (JP), filed on Aug. 30, 2016.
Prior Publication US 2024/0219718 A1, Jul. 4, 2024
Int. Cl. G02B 27/01 (2006.01); B60K 35/00 (2024.01); G02B 5/08 (2006.01); G02B 5/10 (2006.01); G02B 27/00 (2006.01)
CPC G02B 27/0101 (2013.01) [B60K 35/00 (2013.01); G02B 5/0891 (2013.01); G02B 5/10 (2013.01); G02B 27/0018 (2013.01); G02B 27/0068 (2013.01); B60K 2360/334 (2024.01); G02B 2027/011 (2013.01); G02B 2027/0118 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An information display apparatus configured to display video information of a virtual image on a windshield of conveyance, the information display apparatus comprising:
a video generator configured to generate a video of the video information; and
an optical system configured to make light flux incident from the video generator and display the virtual image formed by enlarging the video generated by the video generator,
wherein the optical system includes a concave mirror and an optical element,
wherein the optical element is arranged between the video generator and the concave mirror,
wherein the optical system is configured to include an optical element with negative refractive power, the optical element with negative refractive power being configured to make video light incident on the optical element from the video generator and emit the video light toward the concave mirror, and
wherein a shape of the concave mirror is a shape having average radii of curvature different between a horizontal direction and a vertical direction so as to correct a difference between the radii of curvature in the vertical direction and the horizontal direction of the windshield.