Discharge lamp lighting device
AssigneeMatsushita Electric Works, Ltd.
InventorTomoyuki Nakano
Life of this patent
Estimating the term…
Abstract
A discharge lamp lighting device capable of minimizing the dimensions and weight of socket and decreasing costs is to be provided. The discharge lamp lighting device is provided with a power supply line for supplying a power to a discharge-lamp starting circuit in addition to a pair of output lines for discharge-lamp lighting outputs from a lighting circuit, and is arranged for supplying the power from the lighting circuit through the power supply line, auxiliary electrode of the lamp socket, outer peripheral electrode and output lines to the starting circuit, to thereby realize the dimensional and weight minimization and the cost reduction.
Claims22
A discharge lamp lighting device comprising:
- a discharge lamp having a lamp base including a first central electrode and
- an outer peripheral electrode surrounding the first central electrode,
- a lighting circuit for lighting the discharge lamp,
- a starting circuit for starting the discharge lamp to have it lighted, and
- a lamp socket to which the lamp base of the discharge lamp is mounted,
- wherein the lamp socket is provided integral with the starting circuit and includes a second central electrode to be connected to the first central electrode of the lamp base and outer and auxiliary electrodes to be connected to the outer peripheral electrode of the lamp base when the lamp base is mounted to the lamp socket, and
- the device further comprises a power supply means including a pair of lighting output lines and a power supply line, at least one of the lighting output lines supplying a lighting output of the lighting circuit through the starting circuit to the first and second central electrodes, the power supply line being connected through the starting circuit to the auxiliary electrode of the lamp socket, and the power is supplied to the starting circuit when the lamp base of the discharge lamp is mounted to the lamp socket by connecting through:
- the outer peripheral electrode of the lamp base connected to the outer electrode of the lamp socket when mounted thereto, the auxiliary electrode, the other output line, the lighting circuit and the power supply line.
A discharge lamp lighting device comprising a discharge lamp, a lighting circuit for lighting the discharge lamp, a starting circuit for starting the discharge lamp, and a socket to which the discharge lamp is mounted, a power supply means is further provided, the means including a pair of lighting output lines at least one of which connects the lighting circuit through the starting circuit to the discharge lamp for stably lighting the discharge lamp, and a power supply line for supplying a power to the starting circuit, the arrangement being such that the power is supplied to the starting circuit when the discharge lamp is mounted to the socket, and the lighting circuit, starting circuit and socket are provided integral;
- wherein a conducting case covering the starting circuit is connected to the starting circuit through a capacitor included in the filter circuit.
A discharge lamp lighting device comprising a discharge lamp, a lighting circuit for lighting the discharge lamp, a starting circuit for starting the discharge lamp, and a socket to which the discharge lamp is mounted;
- a power supply means is further provided, the means including a pair of lighting output lines at least one of which connects the lighting circuit through the starting circuit to the discharge lamp for stably lighting the discharge lamp, and a power supply line for supplying a power to the starting circuit, the arrangement being such that the power is supplied to the starting circuit when the discharge lamp is mounted to the socket;
- and the lighting circuit, starting circuit and socket arc provided integral;
- wherein a conductive reflector is provided for adjusting the distribution of light of the discharge lamp, the reflector being connected to a conducting case covering the socket incorporating the starting circuit.
Dependencies are inferred from the claim text.