Device for exposing theremosensitive media

An illumination system comprising:

• (a) a plurality of laser radiation sources;
• (b) a first collimating lens for collimating at least a portion of the rays provided by the plurality of laser radiation sources;
• (c) a first lens group which receives the collimated rays and provides a reduced first image;
• (d) a second lens group which collimates and focuses rays from the reduced first image received from the first lens group;
• (e) a modulator which modulates rays from the first image received from the second lens group;
• (f) a third lens group which provides a second image of the modulated rays;
• (g) a plate having a slit, wherein the plate receives rays from the modulated second image and the slit permits only zero order rays of the modulated second image to pass therethrough;
• and
• (h) a fourth lens group which provides an image of the zero order rays.

An illumination system comprising:

• (a) a plurality of laser radiation sources;
• (b) means for collimating at least a portion of the rays provided by the laser radiation sources;
• (c) first imaging means for providing an image of the laser radiation sources;
• (d) means for transmitting rays from the first image of the collimated rays, the means having an entrance end and exit end;
• (e) second imaging means for imaging the exit end of the transmitting means;
• (f) means for collimating and means for focusing rays from the first image;
• (g) means for modulating rays from the first image;
• (h) third imaging means for providing an image of the modulated rays;
• (i) means for separating the diffraction orders of rays from the modulated second image to permit the passage of only zero order rays;
• and
• (j) means for imaging the zero order rays.

An illumination system comprising:

• (a) a plurality of laser radiation sources;
• (b) a first collimating lens for collimating at least a portion of the rays provided by the plurality of laser radiation sources;
• (c) a first lens group which receives the collimated rays and provides a reduced first image;
• (d) a light transmissive plate having entrance and exit ends, wherein the plate is capable of transmitting rays received at the entrance end to the exit end;
• (e) a plate lens group which provides an image of the exit end of the transmissive plate;
• (f) a second lens group which collimates and focuses rays from the reduced first image received from the first lens group;
• (g) a modulator which modulates rays from the first image received from the second lens group;
• (h) a third lens group which provides a modulated second image;
• (i) a plate having a slit, wherein the plate receives rays from the modulated second image and the slit permits only zero order rays of the modulated second image to pass therethrough;
• and
• (j) a fourth lens group which provides an image of the zero order rays.

A laser printer head comprising:

• (a) a laser source;
• (b) a first lens group for forming on the optical axis of the first lens group a reduced first image of the radiant energy from the laser source;
• (c) a second lens group for collimating and focusing rays from the reduced first image;
• (d) a modulator which modulates rays from the first image;
• (e) a third lens group for forming a modulated second image;
• (f) a plate having a slit, wherein the plate receives rays from the modulated second image and the slit permits only zero order rays of the modulated second image to pass therethrough;
• and
• (g) a fourth lens group which provides an image of the zero order rays.