| 摘要 |
<p>A laser element driving apparatus is provided for safely driving a laser element. The laser element driving apparatus (1) includes a laser element LD which changes light intensity corresponding to a flowing current, a light detecting element PD which monitors the light intensity of the laser element LD and converts it into an electrical signal, a light emission control switch (11) for controlling a current flowing to the laser element LD, a feedback amplifier (12) which feeds back the electrical signal of the light detecting element PD to control the light emission control switch (11), and a light emission control switch control circuit (16) which controls the light emission control switch (11) to gradually increase the current flowing to the laser element LD when the laser element LD starts emission, or/and judges abnormal and turns off the light emission control switch (11) when the current continuously flows for a prescribed time to the laser element LD from the emission start of the laser element LD. ® KIPO & WIPO 2007</p> |
