Photographic printing apparatus

GPHYSICS G03Photography G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES ACCESSORIES THEREFOR

G03B27/00Photographic printing apparatus

G03B27/02Exposure apparatus for contact printing G03B27/04Copying apparatus without a relative movement between the original and the light source during exposure G03B27/06for automatic repeated copying of the same original G03B27/08for automatic copying of several originals one after the other G03B27/10Copying apparatus with a relative movement between the original and the light source during exposure G03B27/12for automatic repeated copying of the same original G03B27/14Details G03B27/16Illumination arrangements G03B27/18Maintaining or producing contact pressure between original and light-sensitive material G03B27/20by using a vacuum or fluid pressure G03B27/22by stretching over a curved surface G03B27/24Separating the original from the print G03B27/26Cooling G03B27/28Edge-masking devices G03B27/30adapted to be combined with processing apparatus G03B27/303Gas processing G03B27/306Heat development G03B27/32Projection printing apparatus G03B27/323Copying cameras G03B27/326Enlargers G03B27/34Means for automatic focusing therefor G03B27/36by mechanical connections G03B27/38embodying screws with non-uniform pitch G03B27/40adapted for use with lenses of different focal length G03B27/42for automatic sequential copying of the same original G03B27/423in copying cameras G03B27/426in enlargers G03B27/44for multiple copying of the same original at the same time G03B27/46for automatic sequential copying of different originals G03B27/462in enlargers G03B27/465at different positions of the same strip G03B27/47at different positions of the same sheet G03B27/475copying cinematographic film G03B27/48with original in the form of a film strip moving continuously and compensation for consequent image movement G03B27/50with slit or like diaphragm moving over original for progressive exposure G03B27/52Details G03B27/521Arrangements for applying a supplementary information onto the sensitive material G03B27/522Projection optics G03B27/523for full time exposure G03B27/525for slit exposure G03B27/526in which the projection optics move G03B27/527as a whole in a translatory movement G03B27/528in which the projection optics remain stationary G03B27/53Automatic registration or positioning of originals with respect to each other or the photosensitive layer G03B27/54Lamp housings Illuminating means G03B27/542for copying cameras, reflex exposure lighting G03B27/545for enlargers G03B27/547colour mixing heads G03B27/56Mounting enlarger head on column Mounting reproduction camera on column G03B27/58Baseboards, masking frames, or other holders for the sensitive material G03B27/581in copying cameras G03B27/582Baseboards, easels G03B27/583Handling microfiche G03B27/585Handling cut photosensitive sheets G03B27/586Supply stacks; Peeling off G03B27/587Handling photosensitive webs G03B27/588Supply rolls; Cutting arrangements G03B27/60using a vacuum or fluid pressure G03B27/62Holders for the original G03B27/6207in copying cameras G03B27/6214Copy boards G03B27/6221Transparent copy platens G03B27/6228Platen covers G03B27/6235Reciprocating copy platens G03B27/6242Masks; Overlays; Transparent carriers G03B27/625Apparatus which relate to the handling of originals G03B27/6257Arrangements for moving an original once or repeatedly to or through an exposure station G03B27/6264Arrangements for moving several originals one after the other to or through an exposure station G03B27/6271in enlargers G03B27/6278Handling single frame negatives G03B27/6285Handling strips G03B27/6292Handling microfiche G03B27/64using a vacuum or fluid pressure G03B27/66specially adapted for holding half-tone screens G03B27/68Introducing or correcting distorsion G03B27/70Reflectors in printing beam G03B27/72Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus G03B27/722when the reproduction scale is changed G03B27/725Optical projection devices wherein the contrast is controlled electrically ( G03B27/727Optical projection devices wherein the contrast is controlled optically ( G03B27/73Controlling exposure by variation of spectral composition G03B27/735in dependence upon automatic analysis of the original G03B27/74Positioning exposure meters in the apparatus G03B27/80in dependence upon automatic analysis of the original