Patent attributes
The problem to be solved of the present disclosure is to provide a detection apparatus that detects dropping of a droplet. The detection apparatus comprises an optical element array having three or more optical elements comprising a first light emitting element, a first light receiving element and a second light receiving element, wherein the first light emitting element, the first light receiving element and the second light receiving element are disposed within the optical element array so that a part of a light emitting region irradiated from the first light emitting element and a part of a light receiving region of the first light receiving element overlap and a part of a light emitting region irradiated from the first light emitting element and a part of a light receiving region of the second light receiving element overlap.
