Additive tri-color lamphouse for a photographic printer

DETAILED DESCRIPTION The subject invention controls the time of exposure of the three separate light sensitive emulsion layers of conventional color print paper so that the exposure time of the three additive primary colors is approximately equal.
Through the use of a combination of additive primary color filters and subtractive primary color filters positioned in front of three lamps the quantity of red light can be adjusted to be approximately three times the quantity of green or blue light.
By controlling the quantities of red, green and blue light the exposure time on the color print paper is greatly reduced thereby increasing the overall speed in producing color prints and copies from the photographic printer.
The lamp house, through the use of light transfer rods for conveying the filtered light to a mixing chamber in the lamp house, greatly improves the quality of the color prints by a more thorough mixing of the filtered colors.
The lamp house eliminates the need of controlling light intensity and provides greater efficiency in the operation of the photographic printer through the use of controlled filtering of the three lamps using additive primary color filters and subtractive primary color filters.
By using a combination of color filters not only can the amount of red light be controlled to the mixing chamber, but also the amount of green and blue light can be controlled thereto should the red exposure requirement be satisfied prior to satisfying the green or blue light exposure requirement.
Also the filters may be used in combination to block essentially all of the light from the three lamps when the red, green and blue exposure requirements are satisfied.
The additive tri-color lamp house for a photographic printer includes a lamp house housing having a first lamp, a second lamp and a third lamp, mounted therein for passing light therethrough.
A first filter holder having a first yellow filter, a red filter and a first magenta filter is positioned in front of the lamps.
The first yellow filter is positioned in front of the first lamp