Graphic arts camera flashing attachments

Claim 1

A flashing attachment for a Graphic Arts process camera of the type comprising a lens structure the optical axis of which is at right angles to a film plane structure disposed on one side of said lens structure and at right angles to a copyboard structure disposed on the other side of said lens structure, said attachment comprising a flashing light source located within the light acceptance angle of said lens structure and outside the image acceptance angle of said lens structure for selectively projecting flashing light toward said film plane structure, and translucent light diffusing material disposed between said flashing light source and said film plane structure for controlling the intensity of flashing light incident on said film plane structure to produce illuminance of substantially uniform intensity throughout a predetermined area of a sheet of photosensitive material supported by said film plane structure, said diffusing material comprising a non-Lambertian radiator the diffusion characteristics of which, when using a measuring light beam having a divergence of substantially 2* and incident perpendicular to the diffusing material, are defined by a polar curve of light intensity versus viewing angle exhibiting a light intensity 10* off-axis not more than 82 percent and not less than 60 percent of the intensity on-axis, exhibiting a light intensity 20* off-axis not more than 53 percent and not less than 26 percent of the intensity on-axis, exhibiting an intensity 30* off-axis not more than 36 percent and not less than 14 percent of the intensity on-axis, exhibiting an intensity 40* off-axis not more than 26 percent and not less than 9 percent the intensity on-axis, and exhibiting an intensity 50* off-axis not more than 18.5 percent and not less than 7 percent the intensity on-axis.