Application To Television Tubes
The einzel lens principle in a simplified form was also used as a focusing mechanism in modern display and television cathode ray tubes, and has the advantage of providing a good sharply focused spot throughout the useful life of the tube's electron gun, with minimal or no readjustment needed (many mono TVs did not have or need focus controls), although in high-resolution mono displays and all colour CRT displays an (engineer-adjustable) focus potentiometer control is provided.
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