LED lighting device

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 9006984
APP PUB NO 20130234609A1
SERIAL NO

13817234

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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When a pulsating current is applied to an LED string included in an LED lighting device, and the number of LEDs caused to light up is changed, the LED lighting device is in efficient, since there are LEDs lighting up for a long period of time and LEDs lighting up only for a short period of time. The LED string includes LED string 407 that lights up for a long period of time and LED string 408 that lights up only for a short period of time within a period of the pulsating current. The element size of the LED 102 included in LED string 407 is different from the element size of LED 203 string 408. Thus, the amount of light emission per unit area LED string 407 may be equal to the amount of light emission per unit area LED string 408.

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Patent Owner(s)

  • CITIZEN ELECTRONICS CO., LTD.;CITIZEN HOLDINGS CO., LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Akiyama, Takashi Saitama, JP 182 1892

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