The driving mechanism decreases durability and requires maintenance. There is also a concern about laser deterioration due to electrical noise.
[ No motorised mechanism ]
A system with no moving parts provides higher durability. This eliminates the problem of motor durability which has been a disadvantage of laser scan type micrometers.
[ Ultra long life LED ]
The GaN (Gallium Nitride) LED used as a light source has achieved high reliability without being affected by light source deterioration due to electrical noise.
A semiconductor laser beam is applied onto a polygon mirror which is rotated by a motor to scan the measuring range. The time in which the laser beam is interrupted by the target is measured to obtain the dimension of the target.