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| Introducing a new product platform of high brightness LED light lines for long length web scanning | | Print | |
| News - Latest Machine Vision News | |||
| Sunday, 27 July 2008 22:59 | |||
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Introducing a new product platform of high brightness LED light lines for long length web scanning inspections. Optical, mechanical and eletronical features are designed in a way to allow flexible adaptation to length, output power and controllability of the units. The LED board design enables usage of different LED-Types. In standard modules (SMT) high current LEDs are used for highest intensity and excellent homogeneity in diffuse applications. Alternatively Chip-on-Board-Technology (COB) enables adaptation to high homogeneity requirements in reflective applications. Thus the LEDs board can be custom tailored to the application, even in regard to mixed - color requirements. It also allows future upgrade to even higher performance LEDs, if and when they become available.  The LED board design enables usage of different LED-Types. In standard modules (SMT) high current LEDs are used for highest intensity and excellent homogeneity in diffuse applications. Alternatively Chip-on-Board-Technology (COB) enables adaptation to high homogeneity requirements in reflective applications. Thus the LEDs board can be custom tailored to the application, even in regard to mixed - color requirements. It also allows future upgrade to even higher performance LEDs, if and when they become available. The mechanical design is based on extruded side profiles that integrate MayTec® profile grooves along the sides of the slim housing. This allows easy and flexible mounting into manufacturing lines. In addition, the housing is mechanically stabilized for longer lengths. The design concept allows scalable lengths from 300 mm up to 3000 mm (in steps of 150 mm). Depending on the LED type and the operating parameters, the modular heat sink concept comprises an active air cooling for standard or water cooling for high-end applications. The LED board temperature is continuously monitored to prevent overheating and thus damage to the LEDs. Each 300 mm segment is controlled by an integrated controller unit attached to the cooling element. Control can be either performed by means of a dimmable potentiometer via constant current and remotely via fast TTL-input. The LED light line can be externally triggered with frequencies upt to 50 kHz. The light output is focusable with an acrylic lens that allows for adjustable working distances between 50 and 100 mm. At 50 mm working distance, an illuminance of 400 kLux will be achieved at 700 mA per LED. Depending on the optical system, web scanning applications for highly reflective surfaces like steel and polymer foils will most likely image the individual LED chips onto the reflective surface. Due to the large packing size demanded by cooling requirements, high current LEDs thus create a pattern of bright and dark areas, which rules them out for this application. Utilizing Chip-On-Board (COB) LEDs mounted as close as possible onto the circuit board a homogeneous line of light can be generated. Vision Light Tech offers the High Brightness LED Light Line also in a COB version as an optional version.
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