A printer includes a dispensing head for dispensing viscous material, such as solder paste. A phase difference pixel which is at least a part of the plurality of pixels is configured in such a manner that the photoelectric conversion unit is divided into a plurality of photoelectric conversion units and an insulated light shielding film is embedded in a region for separating the plurality of photoelectric conversion units, which are divided, from each other. An adjusting member engages in an end region of the locking elements accessible from outside.