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Lens edge-blackening

from manual application to an automated process-safe solution

+++ We offer the state-of-the-art solution of edge-blackening of your optics! +++ We will visit you! Make an appointment!


Edge-blackening of optical components is now automated!

ODMuv 50|1

Your advantages:

  • Automatic lens edge-blackening system
  • Non-contact applying of irises
  • Marking with S/No and QR code/labels
  • Indelible , durable UV ink
  • automated
  • extendable by modular design

Why are we doing this?

Because we have been dealing with the printing of optical components for many years!

The aim is to apply a light-absorbing layer outside the optically effective area (circumferential surface/aperture) of optical components by means of edge blackening in order to minimise stray light.



  • Optic manufacturer
  • Sensor technology
  • Camera manufacturer

Fields of application

  • Stray light minimisation
  • Reflex avoidance
  • False light suppression
  • Traceability
  • Contrast enhancement
  • Signal-to-noise ratio

Benefits & Advantages

  • from a stand-alone system up to a process-integrated solution in your production
  • short set-up times
  • variable lens diameters - adapted to your requirements
  • integrated UV-dryer ensures abrasion-resistant ink application
  • and many more

We have achieved this

  • Oursystem is a fully functional semi-automatic prototype.
  • Series models are configured according to customer requirements, for example with several print heads, additional drying and similar
  • Protection of utility models was granted by the German Patent Office on April 17, 2017.
  • Climate tests are commissioned
  • Transmission and reflection measurements are commissioned
  • Additional axes and print heads are currently being constructed
  • Possibilities of a UV solution are currently being investigated
  • We are looking forward to your requirements and your feedback!
More information can be found here › https://www.mwib.de/news/2016/randschwaerzen-und-kennzeichnen-auf-optiken/


State of the art - Status Quo

There is a strong desire to automate the edge-blackening of optical components.

However, state of the art is the manual application of quick-drying liquid lacquers, mostly based on ethanol, with a brush or ink-writer.

The lenses are mounted on a rotating table with vacuum suction or plug-in chuck.

A considerable disadvantage is that an increasing variety of shapes and decreasing production lot sizes stand in the way of a high degree of automation.

This is made more difficult by the use of a large number of coatings, whose property spectra vary greatly due to the different chemical bases.

At the Fraunhofer IOF in Jena, several experiments for the automated application of edge-blackening for this process have been developed and tested for possible industrial applications.

Scattered light in the optical system.

How does stray light arise in the optical system?

  • Scattering on non-ideal surfaces
  • Reflections from optically ineffective surfaces
  • Reflection & scattering at effective optical surfaces

How can it be avoided?

  • Use of iris plates is only possible to a limited extent due to lack of space
  • Geometry of the optically effective surfaces and radii is often at the expense of optical performance
  • Blackening of lens edges makes sense and is usually only a question of cost

About Us

Philosophy / Company policy

As a surface service provider for companies in the optical industry, Matthias Wetzel INDUSTRIEBSCHRIFTUNGEN GmbH has repeatedly come into contact with the subject of lens edge-blackening. In practice, there is a strong desire to automate the blackening of the edges of optical components.

However, state of the art is the manual application of fast-drying liquid lacquers with a brush or ink writer. For this reason, founder an CEO Matthias Wetzel has recently developed a process to automate the blackening of lens edges, supported by the German federal government.

The aim of this automation is to ensure higherprocess reliability and reproducibility, as previous production processes are subject to strong fluctuations in terms of lacquer film thickness and accuracy.

The process developed had been extensively tested on a first prototype. Based on this research, we have been developing on the development of since October 2017 a series production system with an extended range of functions and significant design changes, such as expandable modular construction to allow blackening and marking in one clamping position.

A highlight of this development is, among other things, blackening with UV inks and immediate drying in a UV drying station. Even the printing of different layers on one component is no challenge.


Brüsseler Str. 14, 07747 Jena

Tel: +49 (36 41) 57 93 0
Fax: +49 (36 41) 57 93 22

E-Mail: info(at)mwib.de