Patent ID: 9715053
Date: 2017-07-25
CPC Classifications: G02B

Claim:
1. A light guide comprising: an entrance portion which light emitted from a point light source enters; a light-splitting portion configured to split the light passing through the entrance portion into first light and second light; a first light guide portion and a second light guide portion configured to guide the first light and the second light, respectively, in a specified direction while total-reflecting the first light and the second light, respectively; and a first reflective portion and a second reflective portion provided in the first light guide portion and in the second light guide portion, respectively, the first reflective portion and the second reflective portion configured to reflect the first light propagating in the first light guide portion and the second light propagating in the second light guide portion, respectively; wherein the first light guide portion and the second light guide portion are configured to emit part of the first and second light to outside as a first linear light beam and a second linear light beam, respectively; wherein the light-splitting portion projects toward the entrance portion, and includes a first inclined surface, a second inclined surface and a connecting section, the first inclined surface and the second inclined surface extending toward a first point on an optical axis of the point light source and being substantially symmetrical with each other when viewed from a direction perpendicular to the optical axis, the connecting section connecting the first inclined surface and the second inclined surface near the first point; wherein the entrance portion includes a light-diffusing section opposed to the connecting section in a direction of the optical axis, the light-diffusing section configured to diffuse the light emitted from the point light source toward the first light guide portion and the second light guide portion; wherein each of the first light guide portion and the second light guide portion comprises a boundary surface with outside; and wherein each of the first inclined surface and the second inclined surface is at an angle of θ to the optical axis,