(under subclass 32) Subject matter wherein the intensity of the light reaching the light sensitive paper is variable, wherein the time interval during which light reaches the photosensitive paper is variable, wherein the contrast of relative brightness of a portion of the picture or margin is regulated in accordance with other portions, or wherein the relative brightness of the various colors (color balance) is controlled.
(1) Note. This subclass provides for copiers having a claimed shutter, adjustable diaphragm, diffraction grating, multicolor filter, variable or neutral density filter, a filter selectively placed in the light path, and means to vary the length of time a filter is in the light path. The subclass does not include a copier having a mere stationary color filter or unadjustable diaphragm but is in parent subclass 32 above.
SEE OR SEARCH THIS CLASS, SUBCLASS:
83, for a contact printer with light monitoring exposure control means.
115, for contact printer light box structure with exposure timing means.
