Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000680
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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CURVED GATES IN OPTICAL PRINTERS WILLIAM S. VAUGHN AND FORDYCE TUTTLE* In certain types of optical motion picture printers, it is desirable for the film, in its printing position, to be curved along its length. With certain pull-downs, for example, it is almost essential that a curved gate be used ; and in some cases it is possible, by using curved gates, to dispense with pressure pads and thus avoid the difficulties attendant upon accumulated dirt, grease, and emulsion. The question arises: When a curved object gate is used, what should be the shape of the image gate in order that the image formed by the printing lens will fall on the raw stock? Assuming a lens with a field that is flat over the angle subtended at the lens by the aperture C' FIG. 1. Image of a curved object formed by a flat field lens. in the object gate, the problem has been solved analytically for the general case. (Note: The analytical treatment and the diagrams which follow are two-dimensional and apply to a vertical plane which includes the optical axis of the system. The object gate is thus designated as a circle instead of a circular cylinder, etc.) Let the circle, C (see Fig. 1), of radius, ry represent the object circle, * Development Department, Eastman Kodak Co., Rochester, N. Y. 663