Exposure device for making a stripe screen on a faceplate of a color cathode ray tube

An exposure device for making a stripe screen on a panel section of a color cathode ray tube, said panel section including a shadow mask having a large number of slit apertures therein, said device comprising:

• an elongated light source;
• table means having an opening for allowing the passage of light emitted from said source and a mounting section for mounting said panel;
• a first correction lens disposed between said source and said panel, said first lens having a central portion through which the optical axis of the lens passes and an outlying portion, said outlying portion including means for refracting light from said source toward said axis, forming a first virtual image, the center of the longitudinal axis of said first image being displaced in a first direction from the center of the longitudinal axis of said light source, and the longitudinal axis of said first image being inclined with respect to said light source;
• and
• a second correction lens disposed between said first lens and said panel, said second lens having a central portion through which the optical axis of the lens passes and an outlying portion, said outlying portion including means for refracting light having passed through said first lens away from said axis, forming a second virtual image, the center of the longitudinal axis of said second image being displaced in a second direction opposite said first direction from the center of the longitudinal axis of said first image, to correct the displacement of the image of said light source and project the image of said light source on to the faceplate along the locus of electron beams passing in said color cathode ray tube.