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 great contrast ratio. The OSLON Black Flat and OSTAR Headlamp Pro are matched to the needs of headlight systems and are developed to give headlight makers with superior overall performance and optimized expense.
More and a lot more flexibility is required for the light sources utilised in headlights, says Osram. Not only do they have to be trustworthy and give the acceptable amount of light in all visibility and driving situations, they have to perform various functions and adjust to changing ambient circumstances, which includes higher temperatures in the headlight itself. Osram says that it has created the new LEDs to meet all of these requirements.
OSLON Black Flat is the most recent addition to the OSLON Black Series and is equipped with a ceramic converter and a QFN package (quad flat no leads). Its typical thermal resistance of 5K/W is 20% far better than the standard OSLON Black Series. The black package represents high stability due to the fact the coefficient of thermal expansion of the LED matches the coefficient of expansion of the metal core board. The flat prime, lens-totally free design suits the close coupling required for light guide designs and maximizes the in-coupling of light, says the firm. The solder pad is identical to the other members of the OSLON family members (OSLON Black, OSLON MX and OSLON SX), which enables a wide variety of light output from a largely identical board design. With a power draw of two.3W and an operating existing of 700mA, the new OSLON Black Flat achieves a common luminous flux of 190lm.
The OSTAR Headlamp Pro is able to meet a wide range of needs in terms of output and adaptability to ambient conditions. It provides a a lot more uniform light pattern, much better thermal stability (a lot more usable warm lumens) and higher brightness than its OSTAR Headlamp predecessor. The new 20mm x 20mm higher-flux LED is available in two- to 5-chip configurations. The new OSTAR LED gives headlight makers greater performance at lower fees, claims the firm. AFS (Adaptive Frontlighting Technique) functionality can now be achieved with chips that can be controlled individually or in series. This leads to configurations that permit matrix chip solutions. Typical luminous flux values are about 250lm for a single chip (1A operating current), equating to 1250lm for the 5-chip version. The thermal resistance of the five-chip version has been decreased to two.1K/W, which is .5K much less (a 20% improvement) compared with its predecessor.
“The two new prototypes combine new technologies with new functionality and are completely matched to the demanding automotive specifications of headlight systems,” claims Peter Knittl, Osram’s director of Automotive LED. “This tends to make them especially eye-catching for widespread use in all automobile classes,” he adds. The design of the prototypes uses Osram’s new UX:3 chip technology (which produces high light output even at high currents) and a ceramic converter (which offers a uniform light pattern). Furthermore, encapsulation of the chips directly in the reflector produces a defined light/dark boundary in the light pattern, offering a especially great contrast ratio for easier and improved optical designs. Such properties make the LEDs suitable for efficient use in headlights, claims Osram Opto.
All round, the LED lights are widely used most new cars such as LED Dome Lights, LED Daytime Running Lights, and will come out with even more innovation in the future.