Digital flash intensity control system for phototypesetters

Details Digital flash intensity control system for phototypesetters Digital flash intensity control system for phototypesetters

B - Operations, Transporting

41

B

95/16

B41B 13/00 (2006.01) B41B 21/12 (2006.01)

Patent

CA 1075946

DIGITAL FLASH INTENSITY CONTROL SYSTEM FOR PHOTOTYPESETTERS ABSTRACT OF THE DISCLOSURE For variable letter sizes being pnotographically recorded in a second generation phototypesetter, it is desired to in- crease generated quantities of light flux produced by the flash lamp operating in conjunction with a font disc where larger letter sizes are thereby imaged upon the photosensitive medium, and conversely, to reduce such flux where smaller characters are to be projected. The disclosed system employs a digital letter size code for controlling the amount of charge inserted into a storage capacitor via a digital to analog converter and multi- vibrator. When the flash lamp is triggered at the appropriate time to selectively illuminate a given character, the energy associated with the stored charge is employed to energize the lamp.

263545

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