A method of using vacuum-cleaner filters includes mounting a cylindrical-shaped filter cartridge coaxially on a rotatable spindle. In addition, the image data conversion section re-executes conversion of the picked-up image signals into image data and output of the image data. 5% by weight with respect to the metal oxide particles and a contact angle of the metal oxide particles with respect to water is from 7\xb0 to 12\xb0; and a photosensitive layer which is provided on the undercoat layer. The control signal blocking part prevents the control signal from being applied to the current controlling unit when the detected voltage is lower than the reference voltage. At least one semiconductor package may be mounted on the module substrate and electrically connected to the connection pads.