Variable light beam scanning apparatus

Light beam scanning apparatus in which light beams are modulated with image information signals and the modulated light beams are radiated onto a photosensitive body comprising:

• a light source for producing light beams in which the light energy distribution displays a normal distribution;
• a first scanning means comprising a rotating mirror for causing the light beams produced by said light source to effect scanning at a first speed and in a first direction with respect to a photosensitive body;
• a second scanning means for causing the light beams produced by said light source to effect scanning at a second speed and in a second direction which is perpendicular to said first direction;
• an image formation means for forming developed image constituted by continuous or discontinuous dots on said photosensitive body after scanning in said first and second directions;
• a light source lighting control means connected to said light source for lighting said light source and for changing the diameter of the light beam dot should be developed on said photosensitive body by changing said normal distribution;
• a speed control means for controlling the speed of the rotation of said rotating mirror and the light beam scanning in said first direction caused by said first scanning means in a manner such that the density of dots successively formed in said second direction is variable;
• and
• a frequency control means for variable controlling the frequency of image information signals modulating said light beams is effected in a manner such that the density of dots successively formed in said first direction becomes variable.