US 12,332,482 B2
Optical member
Yujiro Mizobuchi, Nisshin (JP); Hiroshi Ando, Nisshin (JP); and Kazuyuki Ishihara, Nisshin (JP)
Assigned to DENSO CORPORATION, Kariya (JP); TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP); and MIRISE Technologies Corporation, Nisshin (JP)
Filed by DENSO CORPORATION, Kariya (JP); TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP); and MIRISE Technologies Corporation, Nisshin (JP)
Filed on Mar. 3, 2023, as Appl. No. 18/178,089.
Claims priority of application No. 2022-077697 (JP), filed on May 10, 2022.
Prior Publication US 2023/0367070 A1, Nov. 16, 2023
Int. Cl. G02B 6/26 (2006.01); B60R 1/12 (2006.01)
CPC G02B 6/26 (2013.01) [B60R 1/1207 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An optical member to be attached to a mounting member comprising
a light guide having
an incident surface on which an external scene light is incident from a blind area,
a first reflecting surface configured to reflect light from the incident surface,
a second reflecting surface configured to reflect light reflected by the first reflecting surface,
an exit portion that emits the light from the incident surface and the light reflected by the second reflecting surface to outside,
a first rough surface cross-connected with the incident surface, the first reflecting surface, and the second reflecting surface, and
a second rough surface cross-connected with the first reflecting surface and the second reflecting surface, the second rough surface being located opposite to the first rough surface,
a first direction is defined from the first rough surface to the second rough surface and perpendicular to a normal direction of the first reflecting surface,
a second direction is perpendicular to the normal direction and the first direction,
the exit portion is one of a plurality of exit portions arranged at a predetermined interval in the second direction,
the first reflecting surface is defined between the exit portions adjacent to each other, and the first reflecting surface is one of a plurality of first reflecting surfaces arranged at a predetermined interval in the second direction,
an inclination angle γr of the first reflecting surface with respect to the first direction is defined in a rotational direction about an axis extending in the normal direction,
a line segment Lb is defined by connecting a viewer and the light guide in a cross section perpendicular to the first direction,
an inclination angle β of the line segment Lb with respect to the second direction is defined in a rotational direction about an axis extending in the first direction, and
the first reflecting surface is formed so as to satisfy Inequation of 10°≤arctan(tan γr×sin β)≤90°.