Photoflash detector
First Claim
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1. A photoflash detector for use with a camera having a photoflash unit for producing a flash of light when the camera shutter opens, said detector comprising:
- a light-activated SCR electrically disconnected from said photoflash unit and operatively arranged to be activated in response to a flash of light from the photoflash unit;
a signalling device which produces an audible signal;
circuit means operatively coupling said light-activated SCR to said signalling device to operate the latter in response to the activation of said SCR;
a battery operatively connected to power said light-activated SCR, said signalling device and said circuit means;
and a housing containing said battery, light-activated SCR, signalling device and circuit means to provide a self-contained unit.
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Abstract
A self-contained photodetector for detecting the light flash from a photoflash unit which is supposed to flash when the shutter of a camera opens. The detector has a light-activated SCR for turning on an IC chip timer, which produces an output signal that turns on a transistor and causes a piezoelectric buzzer to produce an audible signal. All these components are powered by a battery which is contained in the same housing with them. This housing has an opening for passing light onto the SCR.
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Citations
5 Claims
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1. A photoflash detector for use with a camera having a photoflash unit for producing a flash of light when the camera shutter opens, said detector comprising:
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a light-activated SCR electrically disconnected from said photoflash unit and operatively arranged to be activated in response to a flash of light from the photoflash unit; a signalling device which produces an audible signal; circuit means operatively coupling said light-activated SCR to said signalling device to operate the latter in response to the activation of said SCR; a battery operatively connected to power said light-activated SCR, said signalling device and said circuit means; and a housing containing said battery, light-activated SCR, signalling device and circuit means to provide a self-contained unit. - View Dependent Claims (2, 3, 4, 5)
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Specification