Journal of the Society of Motion Picture and Television Engineers (1950-1954)

Record Details:

Title:
Journal of the Society of Motion Picture and Television Engineers
Date:
1950-1954
Publisher:
Easton, Pa. : The Society
Volume:
Journal of the Society of Motion Picture and Television Engineers
Leaf #:
00055
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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Fig. 1. 24-sided polygon and sprocket assembly. filled in order to obtain compensation of film motion. These are : (1) Uniform film velocity. (2) Uniform polygon velocity. (3) Synchronism between (1) and (2). (4) Phase identity between (1) and (2). Isotransport enables all four conditions to be fulfilled simultaneously and automatically, and in fact neither uniform film velocity nor uniform polygon velocity is any longer essential as long as both film and polygon rotate at the same speed. Contained within the rotating polygon is a stationary optical system called a "core." This is shown in Fig. 2. It consists of a stationary platform which carries a number of optical elements essential to the functioning of the system. These elements are first, two plano-convex cylindrical lenses Fig. 2. "Core" assembly and shrinkage compensator. January 1954 Journal of the SMPTE Vol.62