US 4,394,764 AGranted

Laser processing apparatus

AssigneeTokyo Shibaura Denki Kabushiki Kaisha

InventorKen Ishikawa

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Abstract

Disclosed is a laser processing apparatus, which includes a falling waveform control circuit for controlling the falling of discharge current waveform. A direct current power supply circuit is connected to a main discharge circuit and the falling waveform control circuit for supplying discharge current to these circuits. The main control circuit causes the discharge of the main discharge circuit and falling waveform control circuit successively. The discharge of the main discharge circuit is provided so that it is stopped when the discharge of the falling waveform control circuit is started. The discharge of the falling waveform control circuit is stopped by a discharge current stopping circuit. The main discharge circuit and falling waveform control circuit are connected to a laser beam oscillating section. The laser beam oscillating section irradiates the workpiece with laser beam according to the main discharge current and discharge current having controlled falling waveform supplied from both the aforementioned circuits.

Claims8

Dependent claims

A laser processing apparatus comprising:

direct current power supply circuit means;
main discharge circuit means connected to said direct current power supply circuit means for supplying main discharge current thereto;
falling waveform control circuit means connected to said direct current power supply circuit means for controlling the falling of the discharge current waveform;
discharge current stopping circuit means connected to said waveform control circuit means for effecting the control thereof so that the discharge current is stopped when the discharge current becomes lower than a predetermined value;
main control circuit means connected to said main discharge circuit means, falling waveform control circuit means and discharge current stopping circuit means for effecting the control of these individual circuit means at predetermined timings;
and
laser beam oscillating means connected to said main discharge circuit means and falling waveform control circuit means for providing a laser beam according to the main discharge current and discharge current having a controlled falling waveform portion.

4 more elements

Dependencies are inferred from the claim text.