JPS6489186A - Lighting device for discharge lamp - Google Patents
Lighting device for discharge lampInfo
- Publication number
- JPS6489186A JPS6489186A JP24625987A JP24625987A JPS6489186A JP S6489186 A JPS6489186 A JP S6489186A JP 24625987 A JP24625987 A JP 24625987A JP 24625987 A JP24625987 A JP 24625987A JP S6489186 A JPS6489186 A JP S6489186A
- Authority
- JP
- Japan
- Prior art keywords
- discharge lamp
- lighting state
- dim lighting
- output
- detection
- 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)
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Abstract
PURPOSE:To keep the input power to the minimum required by providing a detecting means detecting the half-wave discharge of a discharge lamp and providing a control means controlling the discharge lamp at the dim lighting state in response to this detection output. CONSTITUTION:When a discharge lamp 3 is half-wave-discharged at the terminal stage of its life, the detection current through a serial circuit 13 is increased, the detection input level of the comparator 15 of a detecting means 4 rises, and the comparator 15 generates an output. A one-shot multivibrator 16 then generates an output, thereby a transistor 19 is turned on, a relay contact is kept closed, a dimming element 2 is invariably inserted in series to the discharge lamp 3, thus the discharge lamp 3 continues the dim lighting state. The input increase is suppressed, and a lighting device is prevented from being made large-sized. An abnormality of the discharge lamp 3 is reported at the time of the dim lighting state, the room is not made dark because of the dim lighting state, and the lamp can be easily replaced.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24625987A JPS6489186A (en) | 1987-09-30 | 1987-09-30 | Lighting device for discharge lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24625987A JPS6489186A (en) | 1987-09-30 | 1987-09-30 | Lighting device for discharge lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6489186A true JPS6489186A (en) | 1989-04-03 |
Family
ID=17145861
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24625987A Pending JPS6489186A (en) | 1987-09-30 | 1987-09-30 | Lighting device for discharge lamp |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6489186A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997038560A1 (en) * | 1996-04-10 | 1997-10-16 | Seiko Epson Corporation | Light source lamp unit, light source device, and projection display device |
JP2006085974A (en) * | 2004-09-15 | 2006-03-30 | Shin Daiwa Kogyo Co Ltd | Battery floodlight |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5622583A (en) * | 1979-07-27 | 1981-03-03 | Toshiba Electric Equip Corp | Transistor inverter device |
JPS59163798A (en) * | 1983-03-07 | 1984-09-14 | 三菱電機株式会社 | Device for firing discharge lamp |
-
1987
- 1987-09-30 JP JP24625987A patent/JPS6489186A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5622583A (en) * | 1979-07-27 | 1981-03-03 | Toshiba Electric Equip Corp | Transistor inverter device |
JPS59163798A (en) * | 1983-03-07 | 1984-09-14 | 三菱電機株式会社 | Device for firing discharge lamp |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997038560A1 (en) * | 1996-04-10 | 1997-10-16 | Seiko Epson Corporation | Light source lamp unit, light source device, and projection display device |
US6268799B1 (en) | 1996-04-10 | 2001-07-31 | Seiko Epson Corporation | Light-source lamp unit, light-source device and projection-type display apparatus and method of use |
US6690282B2 (en) | 1996-04-10 | 2004-02-10 | Seiko Epson Corporation | Light-source lamp unit, light-source device and projection-type display apparatus |
US7006004B2 (en) | 1996-04-10 | 2006-02-28 | Seiko Epson Corporation | Light-source lamp unit, light-source device and projection-type display apparatus |
JP2006085974A (en) * | 2004-09-15 | 2006-03-30 | Shin Daiwa Kogyo Co Ltd | Battery floodlight |
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