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Fast-Cycling
Intermittent for 16mm Film
By WARREN R. ISOM
A 16mm mechanism designed to advance the film during the vertical blanking time of the television system and its use with a flying-spot film scanner for color television is described. The order of the forces encountered is indicated. Also, solutions to certain auxiliary problems are given as well as operating characteristics and performance data.
J? OR A LONG TIME, the need has been recognized for a film-handling machine that is capable of transporting the film from frame to frame within the vertical blanking time of the television system. Of the uses for such a machine, none is more important than that related to the problems of color television. The purpose of this paper is to describe a 16mm mechanism that advances the film in the vertical blanking time and to tell something of its use with a flying-spot scanner as a source of a video signal for color television.
Use in the System
The scanner is a flying-spot tube, RCA No. 73236-D, the raster of which is imaged by a //1. 6 objective lens upon the frame of film in the gate of the film
Presented on October 7, 1953, at the Society's Convention at New York by Warren R. Isom, Radio Corporation of America, RCA Victor Div., Engineering Products Dept., Camden, N.J. (This paper was received October 9, 1953.)
transport (Fig. 1). This frame of film is held in the gate alternately for two and three scans, being advanced during the vertical blanking time. The light that is transmitted through the film is modulated by the photographic image upon the film. This modulated light is gathered up and directed by suitable condensers through selective reflecting and transmitting dichroics to the sensitive surfaces of electron multipliers, the red component to an RCA 6217 tube, the blue and the green each to an RCA 5819 tube. There is a preamplifier for each of these tubes, which work into channel amplifiers and other associated gear for the final processing of the original video signal to NTSC proposed standards. The preamplifiers as well as the servicing equipment for the flying-spot itself are a part, physically, of the film scanner unit. However, the scope of this paper does not include any further mention of this equipment. The principal concern here is the intermittent mechanism, shown in Figs. 2 and 3.
January 1954 Journal of the SMPTE Vol. 62
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