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Lens

Industrial lenses have been inevitable optical element for machine vision and precision measurement along with industrial camera, also have been applied to machine vision systems in various fields such as FPD (TFT&LCD, OLED), SMT&PCB, semiconductor, mobile phone, auto parts, next-generation semiconductor industry, Align, and measuring. Industrial lenses can be classified into different types according to the applications and inspection methods of lenses those are telecentric lens and CCTV(General lens). Generally, standard telecentric lens are said to be object side telecentric. That means that the parallel beams originating from the object are reproduced on the sensor. Thus telecentric lens is good for the accurate measurement tool that has no perspective error over the whole F.O.V. There is no changed the magnification in depth of field (D.O.F) even if up and down the W.D which is different with general lens.

CCTV Lens

Telecentric Lens

Besides, general lens happens magnification changes when W.D moves up& down also perspective error and can see the barrier in case of height object. Finally, it is proper way to composite the system to accurate measurement in the machine field. The angle of view of the lens varies depending on the focal length, and it is mainly used in applications where you want to see a wide F.O.V
CCTV Lens Telecentric Lens
Lens Size Compact Large
Price Low – Priced High – Priced
Magnification Variable Ο X
Viewing angle O X
Inner Coaxial Illumination X O
Application Inspection Precise Measurement
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