OptiCentric^® MOT 100

OptiCentric^® MOT 100 is the heart of the OptiCentric^® system being used in a wide range of applications, either fulfilling complex measurement tasks or accomplishing important steps in the assembly and production process of optical systems. Recognized as industry’s standard for centering error measurement, OptiCentric^® MOT 100 provides outstanding accuracy and flexibility covering applications from tiny endoscope and mobile phone lenses to precision digital camera lenses.

OptiCentric^® MOT 100 is PC-controlled and equipped with an accurate stepper motor stage for positioning or focusing of the measuring head. The measuring head can be programmed to drive to several focus positions or centers of curvature of multi element lenses. The setup data containing the positions of centers of curvatures, radii and other design data can be saved to a file and loaded for any future measurements or analysis. In this way the centering error measurement, alignment and assembly of multielement lenses becomes an efficient and reliable production process.

The measuring head includes a precision electronic autocollimator achieving an accuracy of 0.1 μm when measuring centering errors. In addition all instruments belonging to OptiCentric^® MOT 100 can be equipped with an autocollimator with a longer effective focal length or a CCD camera with a higher resolution thus further increasing the accuracy and reliability of the measurements.

For applications requiring highest accuracy, OptiCentric^® MOT 100 can be equipped with an ultra-precision rotary air bearing table. The rotary air bearing provides lens rotation facilities and an ultra-stable and ultra-accurate reference (rotation) axis for measurement of centering errors. For alignment needs the air bearing is equipped with a stable tilt and translation stage (see left page).

The air bearing integrated in OptiCentric^® MOT 100 is specially designed for optical applications requiring outstanding accuracy and stiffness (axial and radial errors of less than 0.05 μm). Typical example is the assembly of high performance multi-lens objectives. The air bearing features a central hole for measuring in transmission mode or for checking the lens surfaces in reflection mode in connection with the dual measuring head. The precision rotation motor provides smooth rotation - without any vibrations - and, if necessary, accurate angular positioning. For a long operational life, the air bearings are supplied with a complete air conditioning control unit including a membrane dryer, filter and manometer.

The TRT 200 tilt and translation table belongs to the air bearing and is used for aligning the sample or the sample holder. OptiCentric^® MOT 100 systems are fitted with an AB100 air bearing which has an external diameter of 120 mm and a maximum load capacity of 20 kg.

OptiCentric^® MOT 100 - Single Head

The standard instrument includes a measuring head consisting of an electronic autocollimator mounted on a motorized linear stage. The travel of the standard measuring head is 450 mm. Versions with a travel of 250 and 550 mm are also available. The linear stage is mounted on the base of the instrument. This base contains a collimator for measuring transmission.
The light of the horizontally mounted collimator is reflected by a 45 dregree deflection mirror through the sample under test.

The measuring head can be moved to any number of previously saved focal points or centers of curvature. This enables the fast and easy alignment and assembly of multi-lens objectives. The OptiCentric^® MOT 100 is suitable for automated measurement process.

In addition to taking centering error measurements the instrument can also be upgraded to measure radius of curvature or can also be upgraded to measure effective focal length, flange focal length and axial MTF.

OptiCentric^® MOT 100 - Dual Head

For the alignment and assembly of complex and multi-lens objectives, TRIOPTICS developed a dual head instrument series allowing the simultaneous alignment and measurement of bottom and upper lens surfaces. Thus it is possible to determine and correct in real time the centering errors of two optical surfaces in both the x and y axis after just one rotation. This proprietary design improves dramatically the capabilities of the instrument in the field of lens assembly and measurement of centering errors. The dual head is particularly efficient at measuring multiple lenses in order to determine the centering errors within an assembled optical system. The travel of the lower axis is limited to 250 mm due to the height of the instrument.

Extended Sample Diameter

The maximum diameter of a sample handled by the OptiCentric^® MOT range is determined by the distance between the center of the rotation axis and the linear stage. The standard systems presented here handle a sample with a maximum diameter of 225 mm. The diameter range may be increased by enlarging the distance between the rotation axis and column with the linear stage.