Fixed time delay quench strobe

A photographic camera for use with lighting apparatus of the type having a source of artificial illumination, said camera comprising:

• a housing;
• means for mounting an objective lens on said housing;
• means associated with said housing for receiving a source of electrical energy;
• means for effecting an electrical connection from said camera to lighting apparatus;
• means within said housing for defining a film exposure plane;
• a blade assembly mounted and arranged within said housing for displacement from an initial closed arrangement wherein said blade assembly precludes scene light from impinging on said exposure plane to a second arrangement wherein said blade assembly defines a maximum aperture through which scene light is permitted to impinge on said exposure plane and then to a final closed arrangement wherein said blade assembly again precludes scene light from impinging on said exposure plane, such a displacement of said blade assembly serving to define an exposure interval during which scene light is incident upon said film exposure plane;
• scene light detecting means energizable by the source of electrical energy for providing an output signal in correspondence to the amount of scene light detected subsequent to the commencement of an exposure interval;
• and
• means, at least in part, energizable by the source of electrical energy, for initiating the displacement of said blade assembly from its said initial closed arrangement towards its said second arrangement thereby commencing said exposure interval and for providing a first select signal when said camera is electrically connected to the lighting apparatus to initiate the energization of the source of artificial illumination to effect the firing thereof subsequent to the initiation of the exposure interval, and then responsive to said output signal of said scene light detecting means reaching a predetermined value, for effecting the displacement of said blade assembly into its said final closed arrangement and for providing a second select signal immediately subsequent to the expiration of a time delay of predetermined duration, said time delay commencing immediately after said scene light detecting means reaches said predetermined value, said second select signal being operative to initiate the deenergization of the source of artificial illumination to effect the termination of the firing thereof.

Lighting apparatus for use with a photographic camera of the type having means for providing at least two control signals in sequence during the course of a photographic interval, said lighting apparatus comprising:

• a source of artificial illumination;
• means for accommodating at least one electrical connection from said lighting apparatus to the camera in order to facilitate the transmission of the two signals from the camera to said lighting apparatus;
• means for coupling to a source of electrical energy;
• and
• means energizable by the source of electrical energy, and responsive to the first of the two signals from the camera for initiating the energization of the source of artificial illumination to effect the firing thereof, and then responsive to the second of the two signals from the camera for initiating the deenergization of the source of artificial illumination immediately subsequent to the expiration of a time delay of predetermined duration, said time delay commencing immediately after receipt of the second of the two signals from the camera.