Range finder

Details Range finder Range finder

1995-11-03

1997-05-20

Le, Que

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214LS, 327520, H01J 4014

Patent

active

056314582

ABSTRACT:
In a range finder, a capacitor for light emission is charged by turning off first and second switching elements and turning on third and fourth switching elements before light is emitted from a light emitting diode. A sum of a charging voltage of the capacitor for light emission and the voltage of a direct current power source is applied to the light emitting diode by turning on the first and second switching elements and turning off the third and fourth switching elements when light is emitted from the light emitting diode. At this time, an operation of the second switching element is controlled with a constant electric current by a constant current control circuit constructed by a transistor, a resistor for current limitation, a diode, etc. so that an electric current flowing through the light emitting diode is constant and a light emitting amount of the light emitting diode becomes constant.

REFERENCES:
patent: 3813680 (1974-05-01), Wagensonner et al.
patent: 4498753 (1985-02-01), Mizokami

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