Patent ID: 8687205

Claim:
An optical detection device comprising: a first emitting unit that emits first emitting light in a radial pattern and having an intensity that differs in accordance with an emitting direction; a second emitting unit that emits second emitting light in a radial pattern and having an intensity that differs in accordance with an emitting direction; a light receiving unit that receives first reflection light acquired by reflecting the first emitting light emitted from the first emitting unit off an object and second reflection light acquired by reflecting the second emitting light emitted from the second emitting unit off the object; and a detection unit that detects a position of the object based on a result of the light reception in the light receiving unit, wherein the first emitting unit includes: a first light source unit that emits first source light; a second light source unit that emits second source light; a curve-shaped first light guide that includes surfaces including: a first light incident surface to which the first source light is incident, the first light incident surface being located on one end portion of the first light guide, a second light incident surface to which the second source light is incident, the second light incident surface being located on the other end portion of the first light guide, and a convex surface from which the first source light incident from the first light incident surface and the second source light incident from the second light incident surface are output; and a first emitting direction setting unit that receives the first source light or the second source light output from the convex surface of the first light guide and sets an emitting direction of the first emitting light to a direction of a normal line of the convex surface, and wherein the second emitting unit includes: a third light source unit that emits third source light; a fourth light source unit that emits fourth source light; a curve-shaped second light guide that includes surfaces including: a third light incident surface to which the third source light is incident, the third light incident surface being located on one end portion of the second light guide, a fourth light incident surface to which the fourth source light is incident, the fourth light incident surface being located on the other end portion of the second light guide, and a convex surface from which the third source light incident from the third light incident surface and the fourth source light incident from the fourth light incident surface are output; and a second emitting direction setting unit that receives the third source light or the fourth source light output from the convex surface of the second light guide and sets an emitting direction of the second emitting light to a direction of a normal line of the convex surface.