UV light-emitting diodes as a radiation source in a device...

Details UV light-emitting diodes as a radiation source in a device... UV light-emitting diodes as a radiation source in a device...

2008-03-25

2008-03-25

Wells, Nikita (Department: 2881)

Radiant energy

Radiant energy generation and sources

With radiation modifying member

C073S865600, C073S866000

Reexamination Certificate

active

07348581

ABSTRACT:
The usual xenon radiation source in conventional weathering testers is replaced by UV light-emitting diodes (LEDs) (6). These can be used to provide a good approximation of the UV component of the solar spectrum, in particular when different types of UV light-emitting diodes (6) with different emission characteristics are employed. Optionally, further light-emitting diodes in the visible spectral range may also be used in order to cover other parts of the solar spectrum. The light-emitting diodes (6) may be mounted on a flexible printed circuit board (5), which may in turn be fitted on a tubular holding body (4). The flexible printed circuit board carrying the light-emitting diodes may also be placed on other substrates (7) which are pliable in a geometrically stable way, so that that they can be arranged at a uniform distance from material samples with a particular surface topology, in order to obtain uniform exposure.

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