Patent ID: 7701584

Claim:
A circling light path apparatus, comprising: a base having a standard plane; a plurality of substrates laminated parallel to the standard plane in a direction orthogonal to the standard plane; and a first light source including a laser, and wherein the circling light path apparatus includes three or more reflective surfaces, and wherein said three or more reflective surfaces have normal lines that are parallel to, or tilted by a predetermined angle with respect to, a predetermined plane, and wherein said predetermined plane is orthogonal to the standard plane, and wherein said three or more reflective surfaces are located on said base and/or one or more of said substrates, the light source is disposed to emit light within the predetermined plane, and the light emitted from the light source circulates within the predetermined plane in forward and backward directions, and is reflected by said three or more reflective surfaces, and constitutes a circling light path that oscillates said laser.