Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1974-09-18
1976-12-28
Wintercorn, Richard A.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307278, G03B 1912, H03K 300
Patent
active
040004996
ABSTRACT:
An exposure control system is provided for a photographic apparatus in order to selectively actuate drive means including a tractive electro-magnetic means together with other instrumentality means to perform various functions in a predetermined order in the course of producing a photographic record. The control system includes a galvano-magnetic effect means having a predetermined output signal condition responsive to the magnetic field condition of the tractive electro-magnetic means. The galvano-magnetic effect means includes a Hall effect switching device stationed in proximate relation to the tractive electro-magnetic means. The galvano-magnetic effect means may further include a delay means for delaying the time of transmission of a change in the output signal condition from the Hall effect switching device together with a latching means having at least two output signal conditions, the first of which is indicative of a magnetic field intensity below a predetermined level and the second of which is assumed as a result of the magnetic field intensity increasing above the predetermined level. Once the second output signal condition of the latching means is assumed, it will remain thereafter regardless of the level of the magnetic field intensity or output signal condition from the Hall effect switching device and will change back to the first output signal condition only upon receipt of an appropriate trigger signal.
REFERENCES:
patent: 3610968 (1971-10-01), Yamada
patent: 3744385 (1973-07-01), Burgarella et al.
Polaroid Corporation
Roman Edward S.
Wintercorn Richard A.
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