Radiant energy – With charged particle beam deflection or focussing – With target means
Patent
1977-08-11
1978-09-26
Church, Craig E.
Radiant energy
With charged particle beam deflection or focussing
With target means
250409, G03B 4116
Patent
active
041173350
ABSTRACT:
In a fluoroscopic and photographic exposure installation where photographic exposure high voltage is normally automatically derived from the voltage setting during fluoroscopy, a pair of manually operable switches are provided in the motor control circuit for inserting respective preselected reference levels which override the normal adjustment of exposure voltage based on fluoroscopic voltage, and instead control the exposure voltage selectively to a higher setting giving a particularly brief exposure, or to a relatively low value giving improved contrast.
REFERENCES:
patent: 3902069 (1975-08-01), Sharke
patent: 3991314 (1976-11-01), Schmitman
Church Craig E.
Siemens Aktiengesellschaft
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