Output Hardcopy Devices by Robert Durbeck (Eds.)

By Robert Durbeck (Eds.)

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With modulation, intricate fast chang­ ing pictures can be produced. 1. Starting with simple black and white television picture tubes, the CRT becomes more expensive and more difficult to build as the applications proceed through instrument CRTs, military airborne CRTs, projection tubes, photo recording CRTs, and finally to the exotic high speed scope tubes and memory tubes. Aided considerably by solid state electronics, the CRT today can do many jobs which were not possible before the wide­ spread use of semiconductor electronics.

Therefore, the following discussion will compare high voltage ES focus with EM focus. Electrode Configuration and Comparison of ES and EM Focus. In high voltage ES focus, the focus lens is formed by the difference of potential between a cylinder at the end of the gun and the anode voltage which appears on the conductive coating inside the tube neck. ) The lens becomes “softer”, that is, has a longer focal length as the two voltages approach each other. As the distance from the focus element to the screen becomes longer, the focus voltage will therefore be higher.

Fortunately, there is enough latitude in most applications that it doesn’t matter if the wave length varies a few nanometers one way or the other. Although detail data is sometimes useful in designing a system, it has not in the past been deemed sufficiently important to spend a great deal of money on. For those who wish to go into the mechanism of cathodo-luminescence, see Leverenz (1950), Goldberg (1966), and Larach and Hardy (1975). There are now over fifty registered phosphors and in some cases, there is considerable confusion.

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