Opto Engineering’s TCZR Zoom Revolver Telecentric Lens Provides 4 Discrete Magnification Factors
One of the difficulties when trying to apply a zoom lens to a machine vision application is based on calibration consistency. The use of a continuous zoom lens in a metrology application, even lenses with stepper motors and encoders, tends to leave a nagging feeling that the calibration values could be compromised as a continuous zoom is adjusted.
The TCZR Zoom Revolver Telecentric Lens works with image sensors up to 2/3” format and provides 4 discrete magnification changes, rather than having “continuous” zooming. This provides the ability to utilize 4 different fixed-magnification factors with the same lens, greatly increasing the flexibility of the imaging system and, thus, the flexibility of the machine it’s mounted to. More part sizes can be processed when the imaging system can adapt as needed.
At each magnification, the same fixed working F-number and the same working distance are applied. Focusing and image centering stability are guaranteed at every magnification position, thus avoiding the need to recalibrate when magnification changes are made. A calibration factor can be created and loaded for each lens setting.
Two models of the TCZR “Zoom Revolver” lens are available:
- The TCRZ036S provides magnification factors of 0.25X, 0.50X, 1.0X, and 2.0X with a working distance of 74mm
- The TCZR072S provides magnification factors of 0.125X, 0.25X, 0.50X, and 1.0X with a working distance of 157.8mm
The MTDV1CH-22A2 Motion Controller is used to control the lens and includes, in addition to the 15-pin connection to the lens, an RJ-45 connection, a USB connection, and terminal blocks for access by the automation system. The vision system and the machine it’s on can then utilize the magnification factor most appropriate for the situation.
To explore the use of these unique “zoom” lenses, please contact R.J. Wilson, Inc.