Lighting systems

One of the most important and decisive components regarding the quality and price of an image processing system is the lighting used. The lighting system should be specially adapted and selected for the individual application. Special solutions are often necessary here, because the geometries of the existing lighting solutions do not deliver the desired quality.

Because: The better the lighting is adapted to the individual case, the less software development effort is subsequently required to bring the image processing solution to the desired quality level and the required performance. Every application has its own challenges in this regard. In this area, STV Electronic offers a large number of high-performance standard components that have been developed for a wide variety of tasks in the industrial environment. The spectrum of the STV lighting portfolio extends to RGB ring lights, back lights, direct lights and flat lights of various colors and dimensions. In addition, STV Electronic continuously develops innovative components and special solutions on behalf of customers.

Ringlicht stv electronic

Ring lights LAL-LE series

Our LAL-LE ring light units combine bright light incident at a small angle with compact dimensions. The optionally fitted diffuser screen prevents unwanted reflections on glossy objects. This ring light unit type is mainly used to detect minimal damage, such as scratches on glossy surfaces.

For the overview: Click on the picture

Ring lights LAL series

Our LAL ring light units combine bright light incident at a small angle with compact dimensions. The optionally fitted diffuser screen prevents unwanted reflections on glossy objects. The ring light units are controlled using a 24V PWM signal and there is no need to use PWM signals to transfer power. This ring light unit type is mainly used to detect minimal damage, such as scratches on glossy surfaces.

Click on the picture to see the product overview

HC=High Current (increased current and irradiance)

Ring lights HAL-LE series

HAL-LE-series ring light units combine bright, indirectly incident diffuse light with compact dimensions. The ring light units are equipped with one light source, producing very even, homogeneous light emissions. Use ring light units to produce diffuse dark field lighting with the optionally available shading sleeve.

Our ring light units are mainly used to illuminate objects with highly reflective surfaces where shading and reflections must be avoided.

Click on the picture to see the overview

Ring lights HAL series

HAL-series ring light units combine bright, indirectly incident diffuse light with compact dimensions. The ring light units are equipped with one light source, producing very even, homogeneous light emissions intended for additive colour mixing (RGB type). Use ring light units to produce diffuse dark field lighting with the optionally available shading sleeve. 24V PWM signals control the ring light units and there is no need to use PWM signals to transfer power.

Our ring light units are mainly used to illuminate objects with highly reflective surfaces where shading and reflections must be avoided.

The STV highlight: one RGB type with RGB LEDs and additive colour mixing – ideal for image processing! Create almost any lighting colour using just a single ring light unit. Create an enhanced white compared with conventional, white LEDs!

Click on the pictures to see the overview

HAL300-Serie

HAL600-Serie

HAL900-Serie

HC = High Current (erhöhte Strom- und Bestrahlungsstärke)

Image processing with black and white cameras

When selecting suitable lighting, the wavelength spectrum is very important. In a real black-and-white image different colors may have the same brightness values, so that there is no longer sufficient contrast difference and further processing becomes difficult or even impossible. Here it is worthwhile to try different colors of light in order to achieve a sufficient contrast. These are our RGB ring lights best suited. They simplify the commissioning of an image processing system on site or even make it possible for the customer to do so. It is no problem to change the color if the surrounding has changed. Thanks to our PWM modules with Web interface and Modbus-TCP, an RGB ring light can be operated completely independently or, alternatively, controlled by any image processing software.

Image processing with color cameras

White light is ideally composed of a multitude of spectral colors. Depending on the nature of the illuminated object, light of different wavelengths is absorbed, reflected or transmitted differently. For example, if a body illuminated with white light shows a high absorption for yellow light, in the remaining reflected light this proportion is lower than before. In this case this body appears blue (complementary color to yellow). If an object is illuminated with its “own color”, it will appear bright in the picture, if it is illuminated with the complementary color, it will appear dark.

In color image processing, it is expedient to work with white light. For this purpose, a suitable light source is of crucial importance. Although white LEDs appear to be halfway white to the observer’s eye, they actually have a limited spectral range of sufficient intensity. For a white LED, the luminescence wavelength conversion is used. RGB ring lights are also better in the color image processing.

Back lights FAL series

FAL-series backlight units boast compact dimensions and a bright, homogeneous light thanks to the integrated diffuser screen. This backlight model is mainly used to measure the outlines of work pieces, check their position and, for instance, detect barcodes on printed circuit boards.

Click on the picture to see the overview

FAL300-3131-Serie

FAL300-14431-Serie

FAL300-782582-Serie

FAL300-14476-Serie

Direct lights CDL series

The direct lights of the CDL-series were specially developed for the “Schmalz SWG vacuum grippers” for handling wafers and solar cells. In addition to compact dimensions, they have uniform, bright and diffused light and an integrated diffuser (except UV). The lights are controlled via 24 V PWM signals. Thanks to integrated electronics, no power transmission via the PWM module is required.

The field of application of direct lights is edge or edge break detection in the production of wafers and solar cells.

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Flat lights SFL series

The flat lights of the SFL-series have compact dimensions and uniform, bright and diffused light. The lights are controlled via 24 V PWM signals. Thanks to integrated electronics, no power transmission via the PWM module is required.

Field of application of square area lights is edge detection in the production of wafers and solar cells.

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Light control DAV1200

DAV1200 is a four-channel PWM-module and is used to actuate and supply the HAL300-RGB ring light or similar lighting products. The values for individual channels can be specified using a WEB interface or using the modbus TCP protocol.

  • Simpler operation and configuration 
  • Preferences for all STV Electronic distributed lighting products and optical systems 
  • Free configurable, even for appropriate lighting products of third party manufacturers 
  • Four 24V-PWM-channels with up to 1A output current 
  • One 24V I/O 
  • Specifying using WEB interface or modbus TCP protocol 
  • Extended range of functions: e.g. 5V trigger for flash mode 
  • Scalable via “STV light bus”

Individual service and advice

We will find the right solution for your requirement. Our experts support you in the development of your individual solution, in robot programming, software and hardware development as well as programming your PLC.

If you have any questions or need advice, please contact us!

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