PURPOSE: To improve the utilizing efficiency of electron beams by providing a plurality of modulating electrodes divided in the longitudinal direction to a plurality of linear cathodes laid at a determined pitch.
CONSTITUTION: Electrons generated from a linear cathode is passed through the electron beam passing holes of a face electrode 4 as electron beams 9 by an electric field applied to the face electrode 4 and deflected horizontally by a horizontal deflecting electrode 5, and makes a light emitting part 7 luminous over a determined range to form a picture plane. At this time, the following voltage is applied to a-d of each modulating electrode 2. When the number of electron beams (the number of cathodes) is A, the image insertion time T of an image signal in a horizontal scanning period (1H) is divided to T/A, the time axis of the image signal in the divided individual period is increased A times and extended to T hours, and the resulting signal is applied to each corresponding modulating electrode (for example, 2-a). In the following 1H period, the signal is applied to the electrode 2 in the state where each electron beam is deflected in the vertical direction by a vertical deflecting electrode 6, and after then on, this is repeated.
KAWACHI YOSHIKAZU
TOMII KAORU
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