Cooling fan with light-emitting device
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United States of America Patent
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-
Jan 20, 2004
Grant Date -
Oct 9, 2003
app pub date -
Apr 1, 2003
filing date -
Apr 4, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cooling fan with a light-emitting device has a frame, multiple light-emitting diodes (LEDs), a circuit board, a stator, permanent magnets and an impeller. The permanent magnets are formed around the inside-perimeter of the casing of the impeller. The impeller is rotated by the interaction force between the poles of the electro-magnetized stator and the poles of the permanent magnets in the impeller. The rotational speed of the impeller is controlled by the drive circuitry on the circuit board. Each LED projects light towards the impeller and to the frame so the light will reflects and bounces all over the fan to produce a fantastic visual effect. The LEDs can be made to twinkle based on the rotational speed of the fan to increase the visual attractiveness.
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