A transfer point of a transfer arm is detected accurately and stably by using a position detecting wafer having an electrostatic capacitance sensor. A packaged substrate with an opening disposed in the central region, and a connecting terminal is passed through the packaged substrate and disposed around the opening. A display image source is configured to project an image onto the display surface. The nozzle unit cells 1 are manufactured using semiconductor and micro mechanical techniques such that the spacing between adjacent nozzle apertures 5 in the printhead is less than 100 microns. The course image is acquired by electrically turning on the objective lens. The redundant voice data that is actually received is discarded.