īˈkänəˌskōp noun
Etymology: from Iconoscope, a trademark
: a camera tube containing an electron gun and a photoemissive mosaic screen each cell of which produces a charge proportional to the varying light intensity of the optical image focused on the screen by the camera lenses, these charges being transformed as the beam of electrons from the gun scans the screen into voltages that are subsequently amplified and transmitted as television picture signals — called also ike