| 摘要 |
<p>The luminous output of the luminescent diode, operated at a constant light source, is held constant by electric control. The dissipated light, impinging at a constant spatial angle from the diode, is received and converted into an electric control magnitude, changing inversely with the luminous output. The control magnitude regulates the operating current of the luminescent diode. Preferably a current analogous to the control magnitude is super-imposed with an independent base current, and the luminous output of the diode is adjusted by changes in the base current. Alternately a base voltage may be used in the same manner. An opto-electronic receiver is used for this purpose, i.e. a phototransistor, or a photodiode.</p> |
