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Non-contact Lens Thickness Testing

TRIOPTICS GmbHRequest Info
 
Non-contact Lens Thickness TestingConventional tactile measurement of the lens center thickness usually limits the production process of single and cemented lenses in terms of achievable accuracy and production output. The OptiSurf® LTM non-contact lens center thickness measurement system by TRIOPTICS provides a solution to both problems. In addition to the surface form accuracy, center thickness is another important parameter for the manufacturing of lenses. Thus, during the production process, the center thickness of the workpiece is routinely measured in order to reach the usually tight specifications from the optical design.

If the conventional tactile thickness measuring method is used, the processed lens must first be removed from the supporting arbor tool including bonding cement and any protective lacquer – a considerable critical and time consuming process. In contrast, TRIOPTICS’ optical measurement of OptiSurf® LTM, which is based on low-coherence interferometry, makes it easy to determine the precise center thicknesses of individual lenses and doublets during the manufacturing process. This non-contact thickness measurement method allows measuring the lens thickness from one side and in the cemented state on the tool. This results in a substantial productivity increase and lower reject rate. Target values are achieved quickly and reliably.

The OptiSurf® LTM is a compact measurement system with an integrated touchscreen. Two clamping chucks were developed as a holder for the test lenses, which can be flexibly adjusted to different lens diameters (8 mm to 200 mm or 1 mm to 30 mm) and keep the samples centered at all times. USB interfaces offer the option, for example, to connect a barcode scanner for lens identification purposes. The software was adapted to the production workflow and has an easy-to-use interface with an optimized touch function.


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Trioptics GmbHProductsTest & MeasurementOptiSurfmeasure lens center thickness

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