Drive circuit of light emitting element

Details Drive circuit of light emitting element Drive circuit of light emitting element

1999-02-24

2000-08-01

Wong, Don

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

315149, 372 31, 372 38, H01S 300

Patent

active

060971592

ABSTRACT:
A drive circuit of a light emitting element capable of setting a desired constant current and capable of operating stably at a high speed while holding a forward direction voltage required for the emission of light even under a low power supply voltage, wherein there is provided an input circuit which receives differential drive signals and outputs differential signals of levels in accordance with the level of a supplied drive voltage, a differential output circuit in which an emitter-connection portion of transistors is grounded via a resistor, the differential signals and are supplied to bases, and a laser diode is connected to a collector of the transistor, a reference voltage generation circuit which generates a reference voltage, a comparison circuit which compares the voltage of the emitter-connection portion with the reference voltage and outputs a signal of the level in accordance with the result of comparison, and a variable voltage supply circuit which generates a voltage in accordance with the input level of the output signal and supplies the same as the drive voltage of the input circuit.

REFERENCES:
patent: 4320964 (1982-03-01), Ishida et al.
patent: 4998043 (1991-03-01), Unami et al.
patent: 5638390 (1997-06-01), Gilliland et al.

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