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Compact telecentric lenses

Telecentric lenses


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Telecentric lenses

Lenses in which the chief rays are parallel to the optical axis, providing a constant magnification regardless of the object distance.

The human eye suffer from a parallax error which causes the distant objects to look smaller than closer ones. Actually, this error is only a change in magnification within the range of depth of field of human eye. In a telecentric lens the system pupil is at infinity and this results in minimum perspective errors when changing the object position.

Therefore the size of the viewed object appears to be the same when changing the distance of the object (within the range of depth of field). These lenses are ideal for precision measurements applications.

Comparative diagrams of different optical systems
 

Standard lens

Object side telecentric lens

Both sides telecentric lenses

Standard lens

Object side telecentric lensBoth sides telecentric lens
The size of viewed object changes when the distance between object and lens varies.
Lens has smaller dimensions.		The size of viewed object does not change when the distance between object and lens varies.
Diameter of lens is larger.
Cost is higher than standard lenses.		The size of viewed object does not change when the distance between object and lens and the distance between lens and sensor varies.
This lens is rather expensive
Available types
Compact telecentric lenses with 40mm working distanceCompact telecentric lenses with 65mm working distanceCompact telecentric lenses for micro mount cameras

with 17mm and 12mm micro mount

For 40mm working distance
Suitable for small devices such as bonding machine or chip mounter.
Compact design with vibration resistance.		For 65mm working distance
For midde working distance, short distance between object and sensor and high numerical aperture.
 
Compact telecentric lenses for 110mm working distance
Compact telecentric lenses with 220mm working distance
For 110mm working distance
Long working distance and compact, suitable for "custom" system.
 		For 220mm working distance
Long working distance (220mm or more). For high resolution and short lens length.
Telecentric lenses are available either as standard version or with a side derivation for coax lighting

 

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