US 12,111,499 B2
Light guide member
Hiroshi Ando, Nisshin (JP); and Kodai Takeda, 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 Jul. 11, 2022, as Appl. No. 17/861,909.
Claims priority of application No. 2021-118058 (JP), filed on Jul. 16, 2021.
Prior Publication US 2023/0022565 A1, Jan. 26, 2023
Int. Cl. G02B 6/24 (2006.01); G02B 5/02 (2006.01); G02B 6/34 (2006.01); G02B 27/00 (2006.01)
CPC G02B 6/34 (2013.01) [G02B 27/0018 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A light guide member comprising:
an incident portion having a first side and a second side opposite to the first side, and configured to allow an external light from an external scene to be incident on;
an emission portion being in contact with the first side of the incident portion to be inclined with respect to the incident portion, and configured to transmit a part of the external light incident on the emission portion and reflect another part of the external light incident on the emission portion;
a reflection portion disposed in parallel with the emission portion to be separated from the emission portion, and configured to reflect the external light incident on the reflection portion; and
an inclined portion connecting the second side of the incident portion and a side of the reflection portion close to the incident portion, wherein
an internal reflection angle inside the reflection portion and the emission portion is larger than an incident angle of the external light in a light guide cross section that is a plane defined by a first normal line and a second normal line, the first normal line is a normal line of the emission portion, the second normal line is a normal line of the incident portion, and the incident angle is an angle of the external light with respect to the first normal line,
a first inclination angle that is an inclination angle of the incident portion with respect to the first normal line is smaller than the internal reflection angle,
a height from the emission portion to the second side of the incident portion in a direction parallel to the first normal line is larger than a distance between the emission portion and the reflection portion, and
a second inclination angle that is an inclination angle of the inclined portion with respect to the first normal line is smaller than the internal reflection angle,
wherein the inclined portion is inclined so as to intersect a surface of the reflection portion.