Automatic CRT exposure regulation

Details Automatic CRT exposure regulation Automatic CRT exposure regulation

1981-09-28

1983-11-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354 1, 430 24, H01J 4014

Patent

active

044182791

ABSTRACT:
A method and apparatus are disclosed for altering the exposure time of a master timer in a CRT light house to accommodate masks having different aperture sizes. For each expected aperture size, an exposure time modifier is pre-stored, the aperture size of a mask is sensed, and the modifier corresponding to the mask's aperture size is automatically selected. The selected modifier is used to alter the rate at which the master timer times out so as to provide an exposure interval appropriate for the mask being processed.

REFERENCES:
patent: 3949226 (1976-04-01), Dugan et al.
patent: 4053904 (1977-10-01), Williams et al.
patent: 4059834 (1977-11-01), Hosokoshi et al.

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