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Moving Film Oscilloscope Photography

IP.com Disclosure Number: IPCOM000093177D
Original Publication Date: 1967-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Murphy, RW: AUTHOR

Abstract

Lens 10 projects a moving image from the face of a cathode ray tube CRT 11. The latter has an X sweep accurately derived from digital counter 12 driven by crystal oscillator 16. The signal to be recorded controls the Y deflection of CRT 11. A succession of discrete, framed pictures 13A, 13B, etc., is recorded on the film with no loss of data in the interframe gaps 14A, 14BB, etc. The time accuracy of the recording is primarily dependent upon the sweep controlled by oscillator 16. An image of graticule 21 is superimposed to define the gap between picture frames in exact synchronism with the CRT 11 image and to represent both X and Y recorded references. Initial calibration is simple with the graticule. The X sweep direction on the CRT 11 face is displayed on the film in the forward direction of movement.

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Moving Film Oscilloscope Photography

Lens 10 projects a moving image from the face of a cathode ray tube CRT
11. The latter has an X sweep accurately derived from digital counter 12 driven by crystal oscillator 16. The signal to be recorded controls the Y deflection of CRT 11. A succession of discrete, framed pictures 13A, 13B, etc., is recorded on the film with no loss of data in the interframe gaps 14A, 14BB, etc. The time accuracy of the recording is primarily dependent upon the sweep controlled by oscillator 16. An image of graticule 21 is superimposed to define the gap between picture frames in exact synchronism with the CRT 11 image and to represent both X and Y recorded references. Initial calibration is simple with the graticule. The X sweep direction on the CRT 11 face is displayed on the film in the forward direction of movement.

The signal displayed in the Y direction on the CRT 11 face moves in the minus X direction at a rate determined by the oscillator 16 and counter 12 circuits to produce an image on the film which travels in the same direction as the film motion, but not as fast as the film. This velocity difference causes each resulting frame image to be compressed in this direction by an amount dependent on the velocity difference. When the sweep retraces before forming the next image, a gap is left on the film before the next effective frame recording begins. The time for retracing the sweep to generate the next CRT 11 a gap is left on the film...