| 摘要 |
PURPOSE:To obtain a new high-pressure discharge lamp small-sized and with high efficiency utilizing a high-frequency lighting method by connecting a luminous tube and an incandescent filament in parallel. CONSTITUTION:A housing 2 storing a lighting circuit contains a DC power supply section 3 consisting of a rectifier and a high-frequency inverter 4 inside, and the output of the inverter 4 is connected to a luminous tube 7 and an incandescent filament 8 stored in an outer tube 5 via connection terminals 6a, 6b. According to this connection, high voltage can be obtained across output terminals 6a-6b of the inverter 4 when the luminous tube 7 has high impedance at starting and restarting, thus facilitating the starting and restarting of the luminous tube 7. During the normal operation when the impedance of the luminous tube 7 reaches a rated value, the power used by the incandescent filament 8 becomes extremely small, almost all the power is consumed by the luminous tube 7, and the whole efficiency is improved. In addition, the lamp and lighting circuit are formed in one body and made compact. |
