Vehicular marker lamp using planar light emitter

1. A vehicular marker lamp comprising:

a planar light emitter; and

a lens coupled to the planar light emitter and including an incident portion formed on a surface facing the planar light emitter,

wherein a plurality of cross-sectionally triangular prisms are arranged in the incident portion in a state where vertexes of the triangular prisms face the planar light emitter, and

each of the prisms includes an incident surface formed on one surface and arranged along the incident portion to make a light from the planar light emitter incident on the incident surface, and a light-shielding portion formed on a surface opposite to the incident surface to shield incidence of the light from the planar light emitter, wherein the light-shielding portion is formed at a substantially right angle with respect to the planar light emitter.

2. The vehicular marker lamp of claim 1 , wherein the light-shielding portion of each of the prisms is configured to shield a light directed in a predetermined direction from the planar light emitter.

3. The vehicular marker lamp of claim 1 , wherein the light-shielding portion of each of the prisms includes a reflective layer that reflects the light from the planar light emitter toward an adjacent prism.

4. The vehicular marker lamp of claim 1 , wherein the incident surface of each of the prisms is formed on a surface including a longer side of each of the cross-sectionally triangular prisms.

5. The vehicular marker lamp of claim 1 , wherein the lens includes a light-emitting surface at an opposite side to the surface facing the planar light emitter, and

the light-emitting surface is included in an outer surface of a vehicle windowpane.

6. The vehicular marker lamp of claim 5 , wherein the lens is formed integrally with the vehicle windowpane.

7. The vehicular marker lamp of claim 5 , wherein the planar light emitter is transparent as a whole.

8. A vehicular marker lamp comprising:

a planar light emitter; and

a lens coupled to the planar light emitter and including an incident portion formed on a surface facing the planar light emitter,

wherein the incident portion includes a plurality of cross-sectionally triangular prisms each having a vertex facing the planar light emitter, the prisms being arranged along a longitudinal direction of a vehicle, and

a light-shielding portion is formed on a surface of each of the prisms, which is directed toward a rear side of the vehicle, to shield incidence of a light from the planar light emitter, wherein the light-shielding portion is formed at a substantially right angle with respect to the planar light emitter.

9. The vehicular marker lamp of claim 8 , wherein the lens includes a projection in a region excluding the prisms on the surface facing the planar light emitter to assemble the planar light emitter.

10. The vehicular marker lamp of claim 9 , wherein the planar light emitter includes an assembly hole through which the projection passes, in a non-light-emitting region that does not face the prisms.

11. The vehicular marker lamp of claim 9 , further comprising:

a plate including, formed therein, an assembly hole through which the projection passes,

wherein the planar light emitter is sandwiched between the lens and the plate.