Apparatus for imaging on a recording medium

An apparatus for imaging on a recording medium, the apparatus comprising:

• at least two imaging heads each having a multiplicity of individual radiation sources electrically driven individually to direct respective light beams onto a radiation-sensitive layer of the recording medium;
• a drive for moving the recording medium and said radiation sources relative to one another;
• a control device connected to said imaging heads for adjusting a power of the light beams of said radiation sources separately for each imaging head;
• a photoelectric sensor connected to said control device;
• and
• at least one light guide disposed to guide a portion of the light emanating from said radiation sources to said photoelectric sensor, said light guide being a rod-shaped light guide formed with light-receiving ends, said light guide being disposed between two imaging heads, and said sensor being disposed between said light-receiving ends of said light guide.

An apparatus for imaging on a recording medium, the apparatus comprising:

• at least two imaging heads each having a multiplicity of individual radiation sources electrically driven individually to direct respective light beams onto a radiation-sensitive layer of the recording medium;
• a drive for moving the recording medium and said radiation sources relative to one another;
• a control device connected to said imaging heads for adjusting a power of the light beams of said radiation sources separately for each imaging head;
• a photoelectric sensor connected to said control device;
• and
• at least one light guide disposed to guide a portion of the light emanating from said radiation sources to said photoelectric sensor, said light guides having light entry surfaces disposed in each case in a housing of a respective said imaging head.