20 September 1976 Simple Step-And-Repeat Precision Copy Camera
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The copy camera resolves 320 lines/mm on high-resolution film with less than 0.01-mm distortion throughout a 30-mm-diameter image made at 20:1 reduction in white or green light. This performance is the result of five special features: (1) an f/4 precision copy lens, which makes diffraction-limited images throughout the image field; (2) a precision focusing mount; (3) a pressure plate that maintains sharp focus for step-and-repeat exposures; (4) a simple indexing jig that locates the images precisely on 101.6- by 127.0-mm film; and (5) a film holder with registration pins to position the prepunched film precisely in relation to the image positions. The camera is used routinely to make single- and stepped-image photofabrication masks, high-contrast resolution test charts, and special reticles.
© (1976) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Berlyn Brixner, Berlyn Brixner, Michael Christian, Michael Christian, } "Simple Step-And-Repeat Precision Copy Camera", Proc. SPIE 0080, Developments in Semiconductor Microlithography, (20 September 1976); doi: 10.1117/12.954831; https://doi.org/10.1117/12.954831

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