Precision Optical Measurement System Manufacturing: Challenges and Solutions

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The manufacturer of precision optical testing equipment Trioptics opted for HepcoMotion’s ring guides to develop its latest measurement system

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Precision Optical Measurement System Manufacturing: Challenges and Solutions
Precision Optical Measurement System Manufacturing: Challenges and Solutions

Trioptics is one of the leading manufacturers of precision optical testing equipment for the inspection of lenses and camera components. The company has been relying on HepcoMotion's products for a long time. However, for their latest development the ImageMaster® Cine Flex, a high precision optical measurement system, they only found their way to the British provider of linear motion solutions after a detour.

In developing this latest instrument, Trioptics was faced with three major challenges. Firstly, lenses for movie production are much larger and therefore more difficult to handle than normal, smaller and lighter digital camera lenses. Secondly, on top of the already challenging size and weight, the client wanted it to be possible to test the perfect functioning of the lens not only in its horizontal but also in its vertical position while also being able to undertake adjustments in that position if needed. Therefore, the optical measurement system had to be constructed in a manner that would be sufficiently stable without compromising on flexibility. Finally, yet importantly, the aim was to create a measurement system that would be able to accommodate up to fifty different lenses.

The right ring for though challenges

Just to achieve the required distance between the optical testing equipment and the lens that is being tested, a ring with an impressive 1500mm diameter was required. The first prototypes built by the Trioptics team used polymer pinions and rings to achieve the movement actuating the test cameras. However, it turned out that the plastic pinions could not handle the 10kg weight of the test cameras reliably over time. “But a safe and repeatable positioning of the optical testing telescopes was essential to achieve the needed high-quality measurement results," explains Dr Stefan Krey, Executive Director at Trioptics.

Trioptics´ test machines are shipped across the world, so the ability to easily readjust the bearings is an important feature for customers from a service point-of-view. In addition, the double-row bearings, which comprise a one-piece outer race with two rows of ball bearings, guarantee improved load capacity, service life and strength - essential for handling the weight of the test cameras. 

Accurate measurement system

During the measurement process on the test machine, two or three motorised test cameras move approximately seventy degrees to cover the entire field of view of the lens. Whilst these movements are relatively slow at about 10-20cm per second, they must be performed smoothly and with absolute precision. The stainless steel ring and double-row bearings manufactured by HepcoMotion comfortably accommodate the weight of the cameras. The camera lens that is being tested is fixed to a support which is completely independent of the ring. As a result, the entire assembly can be rotated from vertical to horizontal – one of the customer´s key requirements.

"This was quite a lengthy project - it was under development for two years," says Dr Krey. However, for the company it was more important to develop a long-term, perfectly functioning test instrument than to achieve in the short term and take risks on the long-term reliability of a machine. "We wanted to be absolutely sure the machine would function in just the same way 20 years from now and that is now the case”, says Krey. The machine's initial success proves him right: the first five of the ImageMaster® Cine Flex have been delivered to the customer´s branches around the world already and are working to their full satisfaction.

Posted on June 3, 2020 - (636 views)
Lower Moor Business Park Tiverton Way
EX16 6TG Tiverton - United Kingdom
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