| 摘要 |
PURPOSE:To exclude the resistance for control of voltage and to collect the unnecessary loss of electric power to utilize it effectively to other devices, by connecting a constant voltage circuit in series to a light emitting element driving part to control the light emitting element driving voltage. CONSTITUTION:A driving circuit consists of a light emitting element driving part including a light emitting element LD, a transistor Q1, a resistance R2, a diode D, a transistor TRQ2, a resistance R4 and an inverter I and a parallel control stabilized power supply P.C,P.S. The power supply P.C,P.S is connected to the return circuits of the element LD and the diode D to produce the voltage VO. As a result, the sum current (i) of the current i1 flowing to a TRQ1 and the element LD and the current i2 flowing to the TRQ2 and the diode D flows to the power supply P.C,P.S. Thus the electric power P=VO.i is produced to be utilized effectively as a power supply for other circuits. In such way, the electric power is collected. |
