Development of an Exploratory Developmental Photographic Contact and Projection Printer

摘要

Under contract DA 28-043 AMC-00177 (E), Itek has designed and fabricated a multifunction contact and projection printer capable of making 2x and 4x enlargements and of performing contact printing in a step and repeat mode. In addition, the printer provides automatic dodging, automatic exposure control, contrast control, automatic registration of the negative, and multiple copies of any single negative. The printer can handle 500-foot rolls of 70-millimeter, 5-inch, and 9 1/2-inch duplicating film, as well as 9 3/8-inch variable contrast paper. With the exception of the print cycle (design goal was 3 seconds, excluding the exposure duration of 4 seconds), the numerous and difficult specifications in the SCL-4611 technical requirements have been met. With a 4-second exposure, relatively good exposures can be obtained in the 4x enlargement modes. The dodging in this mode was 20 percent. Resolutions on the order of 100 lines per millimeter AWAR have been obtained in the 2x and 4x enlargement modes. In the contact mode, the resolution is approximately 50 lines per millimeter. Dodging on the order of 60 to 70 percent can be obtained in the 2x and contact modes. The registration function operates reliably. The automatic exposure control is very sensitive; it operates well in the 2x and 4x enlargement modes. The unit tracks all the duplicating film formats as well as the variable contrast paper. Because of its operational simplicity, the phosphor quench dodging technique is distinctly superior to other methods of dodging; however, the numerous other functions required by this printer make it a highly complex unit. (Author)