Photographic flash device
AssigneeWest Electric Company, Ltd.
InventorsYoshikazu Kaneko, Hisashi Ogura
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Abstract
An automatic photographic flash device wherein the amount of light of the flash tube is automatically controlled in response to intensity of light from the direction of the photographic object by means of an electric circuit A flash tube part is movably installed on a main case part containing a battery and the circuit A switch is installed in the device in such a manner that when the flash tube part is moved to a position not directed at the photographic object, the switch causes the circuit to appropriately increase the amount of light discharged by the flash tube when it is actuated.
Claims5
In an automatic type photoelectric flash device which includes:
- a strobo flash tube retained in a flash tube part rotatably installed on a main part,
- a capacitor connected to said flash tube, said capacitor being adapted to store electrical energy and to supply current for flashing said tube,
- a battery for charging said capacitor,
- a flash-terminating circuit operatively associated with said flash tube, and
- an electric circuit joined to said flash-terminating circuit for controlling same, said circuit comprising light-receiving means for producing an output in response to light reflected from the direction of a photographic object and switching means responsive to said output reaching a preset level for producing a flash-terminating signal which is applied to the flash-terminating circuit, the improvement comprising:
- additional switch means operatively related to said flash tube part and to said electric circuit, said additional switch means actuated in response to the position of said tube part relative to the main part for altering a circuit constant of said electric circuit thereby changing the time required for said electric circuit to produce a flash-terminating signal.
Dependencies are inferred from the claim text.