Laser processing apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
N/A
Issued Date -
Jan 31, 2002
app pub date -
Apr 24, 2001
filing date -
Apr 25, 2000
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
When an IGBT turns on, a current from a laser power supply unit is supplied via a switching element to an excitation lamp of a laser oscillation unit so that the excitation lamp lights to oscillatorily output a laser beam. A switching control unit uses as a main feedback signal a measured-value-of-laser-output signal from a laser output measurement unit and uses as a sub-feedback signal for correction an AC component of a lamp measured-value-of-power signal from a power computing circuit or of a measured-value-of-lamp-current signal from a current measuring circuit. The switching control unit compares the feedback signals with a reference signal having a desired pulse waveform from a CPU to obtain a comparison error. The switching control unit then generates a switching control signal, PWM so as to nullify the comparison error and provides a switching control of the IGBT via a drive circuit in response to the switching control signal.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully