Title:
DISCHARGE LAMP LIGHTING CIRCUIT
Document Type and Number:
Japanese Patent JP3210570
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent bad effects, on life of a discharge lamp and decrease of visibility by abnormality detection of an input voltage and/or current to a lighting circuit.
SOLUTION: An abnormality detection means 5 is provided to detect an input voltage and/or an input current from a power source 2 to a lighting circuit 1, and stop supply of power to a discharge lamp 6 in the case where abnormality in an input voltage value and/or an input current value is detected. Reference values for comparison V1, V2 (V1<V2) are set to the input voltage value and/or input current value, and when a condition of these being smaller than V1 continues for a specified time or more, the abnormality detection means 5 stops supply of power to the discharge lamp 6. When a condition of the input voltage value and/or input current value being larger than V2 continues for a specified time or more, the abnormality detection means 5 allows supply of power to the discharge lamp 6.
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Inventors:
Masayasu Yamashita
Atsuyuki Toda
Satoru Oda
Atsuyuki Toda
Satoru Oda
Application Number:
JP6932496A
Publication Date:
September 17, 2001
Filing Date:
February 29, 1996
Export Citation:
Assignee:
Koito Manufacturing Co., Ltd.
International Classes:
H05B41/282; H05B41/292; (IPC1-7): H05B41/282
Domestic Patent References:
| JP2197441A | ||||
| JP3179694A | ||||
| JP4155796A | ||||
| JP4184895A | ||||
| JP6267679A | ||||
| JP963781A |
Attorney, Agent or Firm:
Yuji Komatsu