JPS6427195A - Lighting device - Google Patents
Lighting deviceInfo
- Publication number
- JPS6427195A JPS6427195A JP62180953A JP18095387A JPS6427195A JP S6427195 A JPS6427195 A JP S6427195A JP 62180953 A JP62180953 A JP 62180953A JP 18095387 A JP18095387 A JP 18095387A JP S6427195 A JPS6427195 A JP S6427195A
- Authority
- JP
- Japan
- Prior art keywords
- light
- reference voltage
- discharge lamp
- inverter
- output signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
PURPOSE:To prevent unnecessary power from being supplied to a lighting device by arranging a light receiving element for receiving light emanated from the lighting device and stopping the operation of an inverter when the output signal of the light receiving element drops to a specified reference voltage. CONSTITUTION:When an inverter 2 works to light a discharge lamp 1, the light L emanated from the discharge lamp 1 is received with a solar cell 6 which outputs a signal 6a commensurate with the amount of the light. The signal 6a, together with a specified reference voltage VR set in a reference voltage generator 7 in control circuit 3A, is inputted to a comparator 9. The comparator compares the output signal 6a with the reference voltage VR from the time point where a delay time set in a timer 8 has elapsed and determines, if the light amount of the discharge lamp 1 runs down and the output signal 6a becomes smaller than the reference voltage VR, than the discharge lamp 1 is broken or its life is close to the end, stops operation of the inverter 2 and prevents unnecessary power from being supplied to the lamp.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62180953A JPS6427195A (en) | 1987-07-22 | 1987-07-22 | Lighting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62180953A JPS6427195A (en) | 1987-07-22 | 1987-07-22 | Lighting device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6427195A true JPS6427195A (en) | 1989-01-30 |
Family
ID=16092162
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62180953A Pending JPS6427195A (en) | 1987-07-22 | 1987-07-22 | Lighting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6427195A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007021479A (en) * | 2005-07-14 | 2007-02-01 | Ark Co Ltd | Sludge dehydrator |
-
1987
- 1987-07-22 JP JP62180953A patent/JPS6427195A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007021479A (en) * | 2005-07-14 | 2007-02-01 | Ark Co Ltd | Sludge dehydrator |
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