Device and method for chemical deposition on an elongated member of vitreous material in which a rotating gripping member causes a first end portion of the elongated member to rotate. The communication systems include authorized electronic devices that proxy authentication and registration for one or more unauthenticated electronic devices. The clamped image signal is supplied to a noise-eliminating circuit 6a and a defect signal concerning the thickness of the assembled fiber band is extracted. At least two of the color filters are laminated in the peripheral portion, and a thickness of the protective film in the display portion is greater than a thickness of the protective film at a position of one of the spacers arranged in the peripheral portion.