PURPOSE: To eliminate uneven illuminance owing to a self-focusing type photoconductive fiber array and eliminate white streaks from images by performing random luminance modulation to a cathode ray tube in addition to luminance modulation by video signal.

CONSTITUTION: Random signal B is generated in a random number circuit 1. In a mixing circuit 2, video signal A is added to the signal B to create the input signal. A cathode ray tube 3 is luminance-modulated by this input signal and is let to make positionally random light emission by the random signal B, thus the regular luminance unevenness owing to a self-focusing type photoconductive fiber array 4 is eliminated. The photosensitive drum 5 is exposed from the cathode ray tube 3 by way of the self-focusing type photoconductive fiber array 4, whereby latent images are formed. This constitution eliminates the illuminance unevenness owing to the self-focusing type photoconductive fiber array and the white streaks may be eliminated from the recording images.