| 摘要 |
<p>Disclosed is a laser diode driving device (1) provided with a variable DC power source (3) which outputs a voltage for driving laser diodes (LD1-LDn), a current driving element (4) which applies a current (If), a current controller (5) which controls the ON/OFF state of the current driving element (4) and the magnitude of the current (If), and a power source controller (7) which controls the output voltage of the variable DC power source (3). On the basis of If-Vf characteristics data (D2), voltage drop characteristics data (D3) and Vds setting data (D4) stored in a memory unit (8), the power source controller (7) controls the output voltage of the variable DC power source (3) such that the voltage between the terminals of the current driving element (4) is constant regardless of the magnitude of the current (If).</p> |
