Current control device and current control method

A current control device for controlling, on a basis of a current command value input from an external device, a light-emitter current flowing from a power supply device to a light emitter that includes one or a plurality of laser diodes, the current control device comprising:

• a switching element coupled in parallel to the light emitter;
• and
• a pulse-width-modulation control circuit to provide pulse width modulation control of the switching element in a case in which an output current output from the power supply device is greater than a present current command value or a next current command value upon a start of supply of, upon a termination of supply of, or during supply of, the light-emitter current, wherein
• the power supply device outputs the output current corresponding to the current command value, and
• the pulse-width-modulation control circuit provides pulse width modulation control of the switching element until the output current becomes the next current command value in a case in which the output current is greater than the next current command value upon the termination of supply of the light-emitter current.

A current control device for controlling, on a basis of a current command value input from an external device, a light-emitter current flowing from a power supply device to a light emitter that includes one or a plurality of laser diodes, the current control device comprising:

• a switching element coupled in parallel to the light emitter;
• and
• a pulse-width-modulation control circuit to provide pulse width modulation control of the switching element in a case in which an output current output from the power supply device is greater than a present current command value or a next current command value upon a start of supply of, upon a termination of supply of, or during supply of, the light-emitter current, wherein
• the power supply device outputs the output current corresponding to the current command value, and
• the pulse-width-modulation control circuit provides pulse width modulation control of the switching element until the output current becomes 0 in a case in which the output current is greater than the next current command value upon the termination of supply of the light-emitter current.