Title:
点灯回路および灯具システム
Document Type and Number:
Japanese Patent JP6691348
Kind Code:
B2
Abstract:
A lighting circuit is configured to turn on or off a semiconductor light source in accordance with a turning-on/off instruction signal. The lighting circuit includes a pulse input determining circuit and a drive circuit. The pulse input determining circuit receives the turning-on/off instruction signal which is in pulse form in commanding turning-on and which is at a constant level in commanding turning-off. The pulse input determining circuit determines whether or not the turning-on/off instruction signal is in a turn-on state in which the turning-on/off instruction signal is in pulse form. The pulse input determining circuit generates a determination signal which is asserted if the turning-on/off instruction signal is in pulse form. The drive circuit supplies the semiconductor light source with a drive current if the determination signal is asserted. The drive circuit does not supply the semiconductor light source with the drive current if the determination signal is negated.
Inventors:
Tomoyuki Ichikawa
Toshihiko Koubayashi
Toshihiko Koubayashi
Application Number:
JP2014240408A
Publication Date:
April 28, 2020
Filing Date:
November 27, 2014
Export Citation:
Assignee:
Koito Manufacturing Co., Ltd.
International Classes:
H05B47/00; B60Q1/04; H05B44/00
Domestic Patent References:
| JP11260569A | ||||
| JP61224596A | ||||
| JP2004241142A |
Foreign References:
| WO2005093916A1 | ||||
| WO2010070720A1 |
Attorney, Agent or Firm:
Sakaki Morishita
Yusuke Murata
Tomoyuki Miki
Yusuke Murata
Tomoyuki Miki