To provide a lighting device whose light use efficiency is high.
The lighting device which lights up an object area to be lit up has a current control circuit 10 which supplies a current controlled to a specified value, a plurality of LEDs 12 which emit lights according to the supplied current, a sequential turn-on circuit 14 which distributes the current supplied by the current control circuit to a specified number of LEDs 12 to make them illuminate, and a guide-in opening 22, and is equipped with a light guide rod 20 which is constituted to move the guide-in opening 22 relatively to the LEDs 12 and guides light taken in through the guide-in opening 22 to the object area to be lit up, and a PLL circuit 16 and a timing generating circuit 18 which controls the sequential turn-on circuit 13 in synchronism with the movement of the guide-in opening 22 of the light guide rod 20, and the sequential turn-on circuit 14 sequentially turns on every specified number of LEDs 12 disposed nearby the guide-in opening of the light guide rod 20 under the control of the PLL circuit 16 and timing generating circuit 18.
| JPH10293233A | 1998-11-04 | |||
| JP2000294491A | 2000-10-20 | |||
| JPH10333588A | 1998-12-18 | |||
| JP2003024275A | 2003-01-28 | |||
| JP2003344948A | 2003-12-03 | |||
| JP2001076525A | 2001-03-23 | |||
| JP2003346503A | 2003-12-05 |
Satoshi Kono
Sadao Muramatsu
Tetsuya Kazama
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