Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1990-09-18
1992-07-28
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
21912162, 372 31, G01J 132, B23K 2604, H01J 313
Patent
active
051342731
ABSTRACT:
A pulsed light source comprising a laser for emitting light in pulse form in response to an electric power from a power supply which is changeable in accordance with a control signal from an external circuit and a photodetector responsive to the light from the laser so as to produce an electric signal corresponding to the intensity of the reception light. The output signal of the photodetector is supplied to a comparator so as to compare the electric signal therefrom with a reference signal to output a signal proportional to the difference between the electric signal and the reference signal. In response to the output signal of the comparator, a control circuit produces the control signal to be supplied to the power supply by adding the output signal of the comparator to a predetermined signal to control the electric power outputted from the power supply to the laser.
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Miki Tadaaki
Mimasu Mutsumi
Shimada Yasuhiro
Wani Koichi
Matsushita Electric - Industrial Co., Ltd.
Messinger Michael
Nelms David C.
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