Method and means for selectively positioning a light source for

Details Method and means for selectively positioning a light source for Method and means for selectively positioning a light source for

1971-09-29

1976-04-27

Engle, Samuel W.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 30, 315 31R, 178 68, 401061, 358 51, H01J 2970

Patent

active

039537641

ABSTRACT:
A light source for illuminating film transparencies is in the form of a cathode-ray tube provided with electronic circuitry which causes the beam of the tube to trace a raster on the screen. The circuitry is such that the area of the raster and its position on the screen can be selectively controlled by the observer for illuminating predetermined portions of the screen. The observer can thus illuminate only that portion of the film transparency of particular interest to him, and can select the intensity of illumination by controlling the electron beam intensity. The raster is developed by sweeping the beam in the horizontal and vertical directions at different speeds using a sweep wave form that is of a symmetrical triangular shape thus eliminating the necessity for blanking the beam as the raster is developed.

REFERENCES:
patent: 2717329 (1955-09-01), Jones et al.
patent: 3249691 (1966-05-01), Bigelow
patent: 3423749 (1969-01-01), Newcomb
patent: 3437873 (1969-04-01), Eggert
patent: 3614766 (1971-10-01), Kievit
patent: 3648098 (1972-03-01), Talbert
patent: 3659144 (1972-04-01), Flemming

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