Head for a color enlarger

Details Head for a color enlarger Head for a color enlarger

1995-05-31

1996-11-05

Royer, William J.

Photocopying

Projection printing and copying cameras

Multicolor picture

G03B 2772

Patent

active

055722865

ABSTRACT:
An arrangement of a color enlarger head is disclosed that allows an original picture negative to be irradiated for print-out with an even quantity of light without the need for adjusting a quantity of light transmitted through a diffuse transmission plate disposed on an exit side of a diffusion box. Them is provided below the diffusion box a light distribution adjusting box in which the light rays transmitted through the diffuse transmission plate are appropriately reflected so as to increase the quantity of light entering a peripheral zone of the original picture negative and thereby to equalize the light rays available to print out the original picture negative. Specifically, below The diffuse transmission plate 60 there is provided a light distribution adjusting box 62 defined by a frame 62a and a bottom 62b provided at a central zone with an opening serving as a projecting window 62c. The light rays having entered light distribution adjusting box 62 through a peripheral zone of diffuse transmission plate 60 are reflected not only by the inner surface but also by a lower surface of diffuse transmission plate 60 so that the light rays reflected by the lower surface of diffuse transmission plate 60 at a zone extending around its central zone enter the peripheral zone of original picture negative 66 and then an enlarged lens 42 while the light rays reflected by the lower surface of the diffuse transmission plate at its central zone enter the original picture negative but do not enter enlarging lens 42.

REFERENCES:
patent: 3754823 (1973-08-01), Weisglass et al.
patent: 3880520 (1975-04-01), Weisglass
patent: 4191466 (1980-03-01), Gandini
patent: 4893149 (1990-01-01), Satou et al.
patent: 5008701 (1991-04-01), Tokuda

Affiliated with

Also associated with

Rating

Head for a color enlarger does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Head for a color enlarger, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Head for a color enlarger will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2018380