Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1979-06-11
1981-07-28
Gellner, Michael L.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
354 50, 354 60R, 354235, 361152, G03B 7097, H01H 4700
Patent
active
042807611
ABSTRACT:
In the disclosed circuit, an electromagnetically driven shutter is opened and closed by an electromagnetic drive device. A detector senses the current through or the voltage across an exciting member of the electromagnetic drive. A drive circuit is controlled by a comparator which compares the output of a constant voltage source with the output of the detector. The drive circuit is regulated so that when the shutter is opened and closed, the current is maintained at predetermined values so as to always keep the shutter characteristics constant.
REFERENCES:
patent: 4104666 (1978-08-01), Toyoda et al.
Kinoshita Takao
Ogawa Yukio
Suzuki Ryoichi
Uchiyama Takashi
Canon Kabushiki Kaisha
Gellner Michael L.
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