Adjustable electronic time switch

Details Adjustable electronic time switch Adjustable electronic time switch

1977-11-30

1979-05-15

Thesz, Joseph M.

Registers

Platform operated

Platform actuated traffic counters

235 92PE, 235 92CV, 235 92R, G06M 302

Patent

active

041550030

ABSTRACT:
In the illustrated embodiments, a rotary position encoder is manually positioned to select any of a set of x-ray exposure times to be used in making medical x-ray photographs. In one form, the encoder output selects a code word from a read only memory, and a comparator ends the timing cycle when a counter reaches a count value corresponding to the active code word. The pulse generator supplying input pulses to the counter, rather than operating at a constant rate, may be controlled so that the pulse count per unit time corresponds to a specified mAs-product, an x-ray tube being switched off when a selected count value (corresponding to a desired mAs-product) is reached.

REFERENCES:
patent: 3746842 (1973-07-01), Fowler
patent: 3824378 (1974-07-01), Johnson et al.
patent: 3824379 (1974-07-01), Tomisawa et al.
patent: 3835384 (1974-09-01), Liff
patent: 3930142 (1975-12-01), Meier

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