An image obtained by reading an original using a reading device is input in units of band images, the input band image is analyzed, and an area corresponding to the original within the band image is detected. The battery also includes an oxygen ion-conducting electrolyte that receives the oxygen ions from the cathode during discharge of the battery. The analyzer is instructed to automatically create therefrom, by itself, the desired new trigger specification. Opposite blade ends are coupled to respective ones of the two aperture rings, permitting pivotal movement in one ring and radial movement in the other ring, when the rings are rotated relative to one another, to change the size of the formed aperture.