Delay timer for a camera

Details Delay timer for a camera Delay timer for a camera

1982-02-16

1984-02-21

Gellner, Michael L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

354266, 361196, G03B 964, G03B 1740

Patent

active

044326246

ABSTRACT:
A relatively inexpensive electronic delay timer particularly suitable for portable use in such applications as control of a camera shutter. The timer can be used in either a leading or trailing mode and employs a small 6V battery as a power source. An integrated circuit timer device is arranged to provide an output signal at the end of a time delay period which can be variably selected by means of a built-in capacitive-resistive network and which is arranged to start in response to a movement of an external control switch. The output signal triggers a second time period of predetermined duration in a second integrated circuit timer during which time a second output signal is generated thereform which is used to activate a transistor device, allowing a capacitor in the circuit to discharge therethrough and through a solenoid which is mechanically coupled to the camera shutter. When the second output signal ceases, at the end of the second time period, the transistor is deactivated and the capacitor recharges. The device is particularly adapted for use in sport coaching, professional and amateur photography and amateur naturalist pursuits.

REFERENCES:
patent: 3686672 (1972-08-01), Ishizuka
patent: 4323789 (1982-04-01), Dion
patent: 4383744 (1983-05-01), O'Connell

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