Radiant energy – With charged particle beam deflection or focussing – With target means
Patent
1975-10-01
1977-05-03
Church, Craig E.
Radiant energy
With charged particle beam deflection or focussing
With target means
250409, 250413, H05G 130
Patent
active
040216721
ABSTRACT:
A dental X-ray diagnostic apparatus in which the setting of the adjustable exposure value, is automatically carried out. A ray detector is applied to the film carrier, which delivers an electrical signal in conformance with the dose rate when it is struck by X-radiation and which, together with the setting means and a dose rate regulator, is connected to an automatic exposure timer in such a manner whereby the adjustable exposure value is influenced by the output signal of the ray detector for the purpose of effecting maintaining constant the dose rate to a value producing an optimum degree of film darkening, and that there is positioned a sample-and-hold circuit between the regulator and the ray detector which stores this signal at a value corresponding to one of the lowest dose rates during a time which is required for the exposure of a plurality of teeth, and whose output signal is transmitted to the actual value input of the dose rate regulator.
REFERENCES:
patent: 3536913 (1970-10-01), Huchel
patent: 3546461 (1970-12-01), Craig
Church Craig E.
Siemens Aktiengesellschaft
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