Abstract: An external light integrating circuitry connectable over two-wires to a flash control circuitry, for causing automatic disabling of an internal light integrating circuitry connected within the control circuitry. The external integrating circuitry receives power over the two wires and transmits light integrating information back to flash termination circuitry within the control circuitry. Camera shutter contacts are connectable with the external integrating circuitry for transmitting a flash initiating signal via the two wires for initiating the photographic flash.

Abstract: A control/calculator device for an associated camera photoflash system, wherein a plurality of photographic variables are manually entered into the device for responsively controlling automatic flash termination and visual display of photographic information including calculated distance information.

Abstract: Circuitry for digitizing received light into a digital pulsating signal, including a photodiode operable in response to light intensity for passing current to a capacitor for developing a voltage level thereacross. A voltage comparator with a hysteresis responds to the magnitude of the capacitor voltage level for tripping the comparator's output between a HIGH and LOW state which directs capacitor discharge to cycle the comparator output in a pulsating manner.In a preferred embodiment, the circuitry is powered by a flash storage capacitor along a pair of conductors which serve both to power the circuitry and to receive pulsating current levels indicating voltage comparator switching. The current levels are sensed and counted for producing a binary count output of received light energy. In another embodiment, the conductors also serve to carry a trigger signal for directing flash initiation.

Abstract: A first circuit arrangement including a zener diode coupled to the base of a transistor for keeping the transistor turned ON in response to the magnitude of voltage developed across a storage capacitor. The capacitor provides power to a photographic flash tube connected in series with a silicon controlled rectifier (SCR). After the flash tube is ignited, energy is drained from the charged capacitor until its voltage level reaches a predetermined magnitude at which time the zener diode becomes non-conducting, turning OFF the transistor, which causes a commutation of the SCR, terminating the flash of the flash tube. The capacitor is then recharged for preparation of the next flash operation.A second circuit arrangement utilizes a programmable unijunction transistor in which the voltage magnitude of the flash storage capacitor is followed by the gate of the unijunction transistor until the gate voltage reaches a corresponding voltage level preset at the anode of the unijunction transistor.

Abstract: An electronic flash device for associated camera attachment, in which the flash device is rotatable about an axis generally perpendicular to the normally horizontal viewing plane of the camera lens. The light sensor of the flash device is automatically positioned by the rotational movement of the flash device, for maintaining the sensor's line of sight, parallel with the camera lens' view direction.

Abstract: A calculator device for an electronic photoflash system in which a photosensor receives light reflected back from the scene being photographed and generates an electrical signal for providing termination of the flash upon sensing a predetermined amount of light. The light received from the scene is reflected from either of two surfaces having different light reflectivities, prior to receipt by the photosensor. The pair of surfaces are carried by a slidable member and selectively positionable at the point of light reflection in accordance with the selection of indicia carried on the front side of the member, by movement of the same by the photographer.

Abstract: An improved trigger circuit for triggering an electronic flash apparatus and for energizing a remote sensor is disclosed.

Abstract: An attachment for photographic flash equipment comprises a dome shaped member which is primarily constructed of light diffusing material but having a portion thereof which is considerably less light diffusing and which operates to direct some of the light emitted by the flash equipment away from a subject to be photographed so that it may be reflected from a nearby surface and thus indirectly illuminate the subject.

Abstract: Electronic flash apparatus includes a flash storage capacitor, a flash tube for selectively discharging the flash storage capacitor to produce light flashes, and terminating means for terminating the light flash. Separate charging means supplies charging current to the flash storage capacitor. Control means causes the charging means to supply the charging current to the flash storage capacitor each time the terminating means terminates a light flash.