Patent ID: 8905525

Claim:
A timing detection device, comprising: a moving object which includes a first face and a second face placed opposite to the first face, has a predetermined thickness between the first face and the second face, and in which the first face and the second face move in a moving direction that is parallel to the first face and the second face; a plurality of openings which are formed by penetrating the moving object from the first face to the second face, and disposed with a spacing along the moving direction; a sensor unit which emits detection light from the first face side toward the moving object, and receives the detection light that passes through the openings on the second face side; and a timing detection unit which detects timing of movement of the moving object based on a pulse signal of the received detection light; wherein in a cross sectional view including the moving direction of the moving object and a thickness direction of the moving object from the first face toward the second face, the moving object includes: an inner wall part which demarcates a lateral edge of the openings on an upstream side or a downstream side in the moving direction; and an edge part which protrudes toward the downstream side or the upstream side in the moving direction at an end fringe part on the first face side or the second face side of the inner wall part; the moving object is molded with a plurality of molds that are separable into respective segments on the first face side and the second face side, and a separation position of the plurality of molds is placed at a position at a distance, with a spacing and in the thickness direction of the moving object, from the edge part.