B-70315EN/02 2.INTERNAL STRUCTURE
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(27) Interface PCB
This PCB communicates with the CNC via the FANUC I/O
LINK (serial interface).
(28) Stabilized power supply
This unit supplies DC power (24 VDC) to the interface PCB and
various units.
(29) Dew sensor
This sensor is mounted to the output coupler holder to monitor
the output coupler for condensation. It prevents faults in each
unit from occurring due to condensation.
(30) Guide laser (red semiconductor laser)
A diode laser is overlaid on the same optical axis as a guide beam
for checking the optical axis because the CO
2
laser beam is
invisible to the unaided eye. The guide beam is emitted in
synchronization with the mechanical shutter only when the
shutter is closed. The guide laser can be used for roughly
adjusting the optical path of an external optical system and for
obtaining a guide for the machining point.
(31) Beam folding unit
This unit extends the optical path length by folding back the laser
beam output from the output coupler in the oscillator and
outputting the beam from the outlet of the oscillator. It consists
of one circular polarization mirror and one zero shift mirror or of
two zero shift mirrors. It is provided in an oscillator of short
optical path length type; it is not provided in an oscillator of long
optical path length type.
(32) Oxygen sensor
This sensor measures oxygen density, so that it prevents that
trouble because of inflow of oxygen as assist gas from machine
tool occures.
(33) Low temperature sensor
This sensor measures the temperature of cooling water. When the
temperature in the laser oscillator is 20℃ or less in start-up of
the oscillator, warm-up driving is executed by software. So it
prevents output power decrease.