Patent ID: 7534024

Claim:
An optical deflector element comprising: a light incoming surface into which enters a light emitted from a light-emitting face of a light guide having a light-incident face into which a light emitted from a primary light source enters; and a light outgoing surface which is positioned on a side opposite to the light incoming surface and from which the light is emitted, wherein plural elongated prisms are arrayed in parallel with each other on the light incoming surface, and each of the elongated prisms is constituted by a top end flat face having an inclination angle of 1 to 50 degrees and positioned at a top end part of the elongated prism, a first prism face positioned on one side of the top end flat face, and a second prism face positioned on another side of the top end flat face, wherein the first prism face is a flat face and the second prism face is a curve face.