by Chris Devers
Osram launches prototype LEDs for headlights
At the International Symposium on Automotive Lighting (ISAL 2011) in Darmstadt (26-28 September), Osram Opto Semiconductors GmbH of Regensburg, Germany showcased two new LED prototypes that combine new chip and package technologies to supply high light output (even at higher currents), a uniform light pattern, thermal stability and good contrast ratio. The OSLON Black Flat and OSTAR Headlamp Pro are matched to the specifications of headlight systems and are created to offer headlight companies with superior functionality and optimized price.
More and a lot more flexibility is necessary for the light sources used in headlights, says Osram. Not only do they have to be trustworthy and give the appropriate quantity of light in all visibility and driving circumstances, they have to carry out numerous functions and adjust to changing ambient circumstances, like high temperatures in the headlight itself. Osram says that it has developed the new LEDs to meet all of these specifications.
OSLON Black Flat is the most current addition to the OSLON Black Series and is equipped with a ceramic converter and a QFN package (quad flat no leads). Its common thermal resistance of 5K/W is 20% much better than the conventional OSLON Black Series. The black package represents high stability since the coefficient of thermal expansion of the LED matches the coefficient of expansion of the metal core board. The flat top, lens-cost-free style suits the close coupling needed for light guide styles and maximizes the in-coupling of light, says the firm. The solder pad is identical to the other members of the OSLON household (OSLON Black, OSLON MX and OSLON SX), which enables a wide range of light output from a largely identical board design and style. With a power draw of 2.3W and an operating existing of 700mA, the new OSLON Black Flat achieves a common luminous flux of 190lm.
The OSTAR Headlamp Pro is in a position to meet a wide range of specifications in terms of output and adaptability to ambient conditions. It offers a far more uniform light pattern, greater thermal stability (much more usable warm lumens) and greater brightness than its OSTAR Headlamp predecessor. The new 20mm x 20mm high-flux LED is obtainable in two- to 5-chip configurations. The new OSTAR LED gives headlight makers far better functionality at decrease expenses, claims the firm. AFS (Adaptive Frontlighting Program) functionality can now be achieved with chips that can be controlled individually or in series. This leads to configurations that enable matrix chip options. Standard luminous flux values are about 250lm for a single chip (1A operating present), equating to 1250lm for the five-chip version. The thermal resistance of the 5-chip version has been lowered to two.1K/W, which is .5K less (a 20% improvement) compared with its predecessor.
“The two new prototypes combine new technologies with new functionality and are perfectly matched to the demanding automotive specifications of headlight systems,” claims Peter Knittl, Osram’s director of Automotive LED. “This makes them particularly eye-catching for widespread use in all automobile classes,” he adds. The design and style of the prototypes makes use of Osram’s new UX:3 chip technologies (which produces high light output even at higher currents) and a ceramic converter (which supplies a uniform light pattern). Additionally, encapsulation of the chips directly in the reflector produces a defined light/dark boundary in the light pattern, supplying a specifically excellent contrast ratio for simpler and enhanced optical designs. Such properties make the LEDs appropriate for efficient use in headlights, claims Osram Opto.
General, the LED lights are widely utilised most new vehicles such as LED Dome Lights, LED Daytime Operating Lights, and will come out with even far more innovation in the future.
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