Telecentric Scanning Lenses
Telecentric scanning lenses are specially designed scanning lens in order to make the focused beam is always perpendicular to the flat focal plane regardless of the beam’s position in the scan lens. This is accomplished by making the exit pupil of the lens system far away enough in the imaging space.
Telecentric scanning lens has special advantages in minimizing spot distortion and drill angle. It’s widely used in critical laser marking applications and drilling holes through a material. A typical application is electronics microvia drilling.
The design of telecentric scanning lens is usually more complex than f-theta scanning lens. Since at least one element will be larger than the field size to be scanned, only small scanning field sizes are possible in practical application.