NL_2021-08 Lens inspection systems from Intego - Evosys Laser


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Lens inspection systems from Intego

Intego develops and produces automatic inspection and measurement systems for industrial manufacturing. A typical field of application for such systems is the quality control of lenses made of glass, plastic or silicone which are used in various industries such as medical technology, the automotive sector or in optical sensors. Depending on the application of the lenses, it is important that the lens surfaces and volumes are free of defects and particles, that the photometric requirements (e.g. focal length or MTF) are fulfilled and that the geometric dimensions are met.

Owing to the customer specific design of the inspection systems, Intego is able to provide tailor-made solutions for exceptional requirements or complex part geometries. For additional flexibility, different lens variants can be inspected in a single machine.

The methods used cover the entire range of optical inspection technology: from bright-field, dark-field and transmitted-light stations (some with specially developed illuminations) to autocollimators, 3D sensors and interferometers.

Typical inspection criteria:

  • Surface defects such as scratches, digs, holes and chippings (DIN ISO 10110-7)
  • Volume defects such as bubbles and inclusions (DIN ISO 10110-3)
  • Inhomogeneities and streaks (DIN ISO 10110-4)
  • Contamination, stains, haze
  • Centering error
  • Determination of the focal length
  • Evaluation of the imaging performance using the modulation transfer function (MTF)
  • Dimensional accuracy test: e.g. thickness measurement or sprue cut-off

Depending on customer requirements, the systems are designed for manual loading or integrated into a fully automated production line or incoming goods inspection with robot loading. The communication interface is freely selectable, e.g. Profinet, Profibus, or Ethernet/IP.

The adapted software with different user levels allows a comfortable operation of the system. By storing the collected measurement data and detected defects, the inspection results can be traced back for each individual part. A statistical real-time evaluation of the data also provides valuable information for the rapid detection of problems in the manufacturing process and gives clues for its optimization.

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Automated testing of medical lenses
Defect detection in dark field
Streaks in an injection moulded lens