This invention relates to a tampon. A time indicator of a display informs a user whether the photosensitive body has to be replaced, and deterioration of an image quality caused by a decrease in the thickness of the photosensitive body can be prevented when a potential of the developing unit is controlled. A blurred and normalized weighting image is produced from image frame data, and this normalized weighting image is multiplied by the composite image. The second direction is at an angle to the first direction. The system determines the relationships between the discovered service components, and matches them into groups of related services. A band-pass filter comprising a first all pass filter and a second adder, a second APF, and a multiplier are used to detect how much a current resonance frequency of the actuator deviates from a set value of a center frequency of the first APF, and based on a result of the detection, the center frequency of the first APF is properly adjusted.