Light guide member

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.