Vacuum fluorescent printer

A vacuum fluorescent printer for forming an image based on image data on a photosensitive material, comprising:

• a print head movable in a sub-scanning direction relative to said photosensitive material, and including:
• a luminous block having a plurality of luminous elements arranged in a main scanning direction for irradiating said photosensitive material with light released from phosphorous objects to which electrons are applied based on a drive signal, thereby forming dots on said photosensitive material;
• and
• a printer controller for generating a pulsed drive signal as said drive signal, said pulsed drive signal having a pulse width corresponding to a time period of irradiation of the light;
• wherein the number of pulses in said drive signal is determined based on a density value of the image data, and
• the pulse width of said pulsed drive signal is variable such that the pulse width becomes larger according as the moving speed of said print head in said sub-scanning direction relative to said photosensitive material becomes slower.