Dischaege lamp lighting device |
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| 申请号 | JP28812387 | 申请日 | 1987-11-13 | 公开(公告)号 | JPH01130499A | 公开(公告)日 | 1989-05-23 |
| 申请人 | Toshiba Corp; | 发明人 | HIRAO YOSUKE; | ||||
| 摘要 | PURPOSE:To reduce the light emitting loss of a discharge lamp by connecting No.1 capacitor between ends of preheat electrodes of the discharge lamp, and connecting No.2 capacitor between he other ends of the preheat electrodes. CONSTITUTION:At the time of start lightup, the current flowing in a resonance circuit consisting of a coil 13 and No.1 and No.2 capacitors 16, 17 diverges to these No.1 and No.2 capacitors 16, 17, and the current flowing in the No.2 capacitor 17 preheats the preheat electrodes 15a, 15b of a discharge lamp 15. Even when the discharge lamp is put in normal lighting condition, the current flowing in the preheat electrodes of discharge lamp 15 consists only of the current flowing in the capacitor 17, and the discharge path will be connected parallelly with the No.1 capacitor 16 equivalently, so that major part of the power is cast into the discharge path. This minimizes the current flowing in the preheat electrodes at the time of normally lighting. Thereby the light emitting loss of the discharge lamp can be reduced. | ||||||
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