| 摘要 |
PURPOSE: To lengthen replacement time of the parts, etc., of a laser beam machine and avoid the alterations of its working conditions, etc., which become the obstacles for automation, by increasing the laser average power of its laser oscillator when the power of its laser oscillator is lowered due to the deterioration of its electrodes and optical parts, etc., by aging. CONSTITUTION: In the control circuit of the power supply for a laser beam machine, a power feedback circuit for making its laser average power constant by increasing its pulse duty factor is provided. In the loop of the power feedback circuit, a power sensor 13, an error amplifier 11, an adder 17, an amplitude limiter 19, a comparator 5, an analog gate 7, a power supply 15 and a laser oscillator 25 are connected in series with each other. |
