
B–70115EN/03
11. LASER OPTICAL SYSTEM
339
(8) Move the lens cleaning paper horizontally to and fro across the
mirror.
NOTE
Since the lens cleaner has a high surface tension, it may be
difficult to move the cleaning paper. As the paper is slowly
moved to and fro across the mirror, however, the ethyl
alcohol will gradually evaporate.
(9) Blow clean air (using, for example, a camera blower) across the
mirror surface to completely evaporate the ethyl alcohol or lens
cleaner.
(10)Repeat steps (7) to (9) until all dirt on the mirror surface has been
removed. Finally, clean the mirror surface with ethyl alcohol.
(11) Check the transmitting side of the mirror. If its surface is dirty,
perform steps (6) to (9) for the transmitting side also. Note that if an
excessive amount of ethyl alcohol or lens cleaner is applied, it may
flow around the back of the mirror, leading to contamination.
(12)Wipe the mirror holder and O–ring with ethyl alcohol.
(13)Reinstall the output coupler in the mirror holder, then insert the
O–ring. When installing the output mirror, pay particular attention
to the mirror orientation. The reflecting plane (the plane indicated
by the arrow on the side of the mirror) must face the discharge tubes.
The arrow is both scribed and marked with ink such that, even if the
ink is entirely removed, it will still be possible to find the scribed
arrow. Align the arrow on the side of the output mirror with the
mirror holder position.
(14)Mount the mirror by reversing steps (2) to (4). Install the mirror
holder in the alignment unit so that the mark on the mirror holder
faces down.
Tighten the mirror holder screw manually, then further tighten the
screw through approximately 30 degrees using a jig. If an
appropriate jig is not available, use the key for the cabinet of the
oscillator instead.
(15) Close the main circuit breaker or turn on the power supply of the laser
oscillator, then turn on the power to the CNC.
(16)Perform a leak check. If the Setting value of the DGN905 (FS16–L,
16i–L) or DGN860 (0–L) is 100 or less, tighten the mirror holder
screw again. In this case, loosen the mirror holder screw first, tighten
the screw manually, then tighten the screw through approximately 30
degrees, using the jig.
(17)This completes cleaning and replacement.
(18)Perform discharge aging.
(19)Then, perform alignment.
NOTE
Never attempt to adjust any part other than the output
coupler.