Digital flash intensity control system for phototypesetters

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

1975-11-03

1977-09-27

Hix, L. T.

B41B 1300

Patent

active

040514862

ABSTRACT:
For variable letter sizes being photographically recorded in a second generation phototypesetter, it is desired to increase 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 multivibrator. 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.

REFERENCES:
patent: 3710698 (1973-01-01), Sinnott et al.
patent: 3738242 (1973-06-01), Lee et al.
patent: 3909832 (1975-09-01), Booth

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