Light irradiation device
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United States of America Patent
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Jul 15, 2014
Grant Date -
May 26, 2011
app pub date -
Jun 1, 2009
filing date -
Jul 30, 2008
priority date (Note) -
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Abstract
The present invention uniforms a size of an LED substrate 2 to realize reduction of the number of parts and reduction of a manufacturing cost, and is a light irradiation device comprising: a long LED substrate 2 on which a plurality of same LEDs 21 are mounted; a chassis 3 having a substrate housing space for housing the LED substrate 2, wherein the number of LEDs 21 in which a difference between a power source voltage VE and a sum of a forward voltage Vf in the series connection of the LEDs 21 is within an allowable range is employed as the number of LED units, and the number of LEDs 21 mounted on the LED substrate 2 is a common multiple of the number of LED units determined in each of LEDs 21 of different wavelengths.
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