
B–70115EN/03
11. LASER OPTICAL SYSTEM
342
To clean the folding mirrors, follow the procedure given below. Since it
is necessary to touch the optical parts and vacuum parts while cleaning
the folding mirrors, wear clean gloves or finger cots. Do not touch these
parts with your bare hands.
Before starting cleaning, wipe away any foreign matter from around the
parts to be removed. If a removed part is inadvertently soiled, wipe it
clean with ethyl alcohol.
[Procedure]
(1) Turn off the power to the CNC, then open the main circuit breaker or
turn off the power supply of the laser oscillator.
(2) Loosen the mirror holder mounting screw, and remove the mirror
holder from the folding mirror unit. To simply replace the folding
mirror at this point, go to step (11).
(3) The folding mirror is attached to its holder using vacuum grease. It
is, therefore, very difficult to remove the mirror from its holder.
Therefore, clean the folding mirror without removing it from its
holder.
(4) Place the mirror with its reflecting side facing up. Gently blow clean
air (using, for example, a camera blower) across the mirror surface
to remove dust and dirt. Drop ethyl alcohol or lens cleaner onto the
mirror surface, moisten a cotton swab with the fluid, and gently wipe
any dirty areas.
(5) Place lens cleaning paper over the mirror, then spray ethyl alcohol or
lens cleaner over the paper and mirror.
(6) Move the lens cleaning paper horizontally to and fro across the
mirror.
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.
(7) Blow clean air (using, for example, a camera blower) across the
mirror surface to completely evaporate the ethyl alcohol or lens
cleaner.
(8) Repeat steps (4) to (7) until all dirt on the mirror surface has been
removed.
(9) By using a cotton swab moistened with ethyl alcohol, clean that part
of the alignment unit which touches the mirror. This is because flakes
of coating may remain in this area. If the flakes of coating are not
removed, they may cause the mirror to become misaligned.
(10) Install the mirror holder by reversing steps (2) to (3). Insert the holder
perpendicular to the alignment unit, so that the mirrors touch the
alignment unit evenly. When tightening the fixing screws, tighten
them evenly in a crisscross sequence.
11.1.3
Cleaning and
Replacing the Folding
Mirrors