Fixed time delay circuit for quench strobe

Details Fixed time delay circuit for quench strobe Fixed time delay circuit for quench strobe

1976-04-08

1977-08-02

Adams, Russell E.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

354 32, 354 33, 354 34, 354139, 354145, 354149, 307293, G03B 714, G03B 716

Patent

active

040400697

ABSTRACT:
A time delay circuit is provided to control a quench strobe so that the quench strobe may be utilized in conjunction with a camera of the type having an automatic exposure control system for controlling a pair of scanning shutter blade elements having respective primary apertures therethrough for collectively defining a gradually varying effective aperture size as a function of the position of the blade elements together with corresponding photocell sweep secondary apertures therethrough for movement in correspondence with the primary apertures to define a small secondary effective aperture for admitting the passage of scene light to a photocell. The time delay circuit is made responsive to the shutter blade closing command signal from the camera control system to provide a quench signal to the strobe only after a predetermined time delay thereby compensating for the fact that the command signal anticipates for the additional light admitted by the shutter blade elements during the time required for the shutter blade elements to close when an ordinary flash lamp is utilized.

REFERENCES:
patent: 3756132 (1973-09-01), Ogawa
patent: 3774072 (1973-11-01), Ogawa
patent: 3858227 (1974-12-01), Ellin et al.

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