JP3093475B2 - High pressure discharge lamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure discharge lamp device using a high- pressure discharge lamp such as a metal halide lamp.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional high-pressure discharge lamp apparatus has a high-pressure discharge lamp 6 (hereinafter referred to as a discharge lamp 6).
U) and having a lighting device 7 for lighting the same. The discharge lamp 6 includes an arc tube 6a, an outer tube 6b covering the arc tube 6a, and a base 6c for supporting and fixing them. Base part 6
One end of each of the two insulated wires 8 is connected to a respective electrode of the arc tube 6 in c. A connector 9 is connected to the other end of the insulated wire 8. The lighting device 7 includes a starting circuit 7a including a step-up transformer that generates a high voltage at the time of starting,
A circuit 7b having a current control function for maintaining stable lighting after startup and a DC power supply circuit 7c are provided. A connector 11 is connected to the other end of the insulated wire 10 having one end connected to the lighting device 7. The connector 11 is connected to the connector 9 on the discharge lamp 6 side, so that the output voltage of the lighting device 7 is reduced. The power is supplied to the discharge lamp 6. The insulated wire 8 is a shield 1 for preventing unnecessary radiation.
2 and a corrugated tube 13 for shielding protection.

[0003]

However, in such a conventional configuration, the diameter of the insulated wires 8 and 10 becomes large because it is necessary to use a high withstand voltage type for the insulated wires 8 and 10. Further, under the use condition in which unnecessary radiation noise from the insulated wire 8 is a problem, the insulated wire 8 is
2 and the corrugated tube 13, there is a problem that the insulated wire 8 becomes thicker and more difficult to handle. Further, since the wiring distance of the high-voltage charging section from the lighting device 7 to the discharge lamp 6 is long, there is a high risk of electric shock and a problem that the pulse voltage is reduced due to the floating capacity of the electric wire.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and has a high handleability, a high level of safety, and a high- pressure discharge lamp capable of suppressing a decrease in pulse voltage due to stray capacitance of electric wires. An apparatus is provided.

[0005]

According to the present invention, there is provided a high-pressure discharge lamp apparatus comprising: a power supply circuit for supplying electric power;
A lighting circuit having a starting circuit for generating the light;
An insulated wire having one end connected to a road and the other end of the insulated wire
And a connector to which the high-pressure discharge lamp is to be connected.
The boost transformer of the starting circuit is built in the connector
And the secondary winding of the step-up transformer
The power supply circuit is connected and generates high voltage at startup
Connected to apply a current to the primary winding .

[0006]

With this configuration, the step-up transformer and the high-pressure discharge lamp are close to each other, so that the routing distance of the high-voltage charging section can be shortened. Thus, since a high voltage required for starting the high pressure discharge lamp to be applied is boosted by the booster transformer in the connector to the high pressure discharge <br/> electric lamp, the output voltage of the lighting device itself conventional high-pressure discharge lamp apparatus It can be set lower.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, a high-pressure discharge lamp device according to an embodiment of the present invention comprises a high-pressure discharge lamp 1 (hereinafter referred to as a discharge lamp).
Lamp 1) and its lighting device 2. The discharge lamp 1 includes an arc tube 1a having a pair of electrodes inside, an outer tube 1b covering the arc tube 1a, and a base 1c for supporting and fixing them. One electrode of the arc tube 1a is connected to the contact 1d, and the other electrode is connected to the contact 1e. The lighting device 2 includes a circuit described below, and the circuit includes an insulated wire 3.
Are connected at one end. A connector 4 is connected to the other end of the insulated wire 3, and a boosting transformer 5 is provided in the connector 4.

The connector 4 has a step-up transformer 5 and insulating casings 4a and 4b made of PBT resin and covering the step-up transformer 5. The step-up transformer 5 includes a primary winding 5b wound around the center of the bobbin 5a, secondary windings 5c and 5d wound symmetrically on both sides thereof, and a co-shaped ferrite core 5e sandwiching the bobbin 5a from both sides. , 5f. One ends of the secondary windings 5c and 5d are connected to the contacts 4c and 4d of the connector 4,
The other ends are connected to the internal conductors 3a and 3b of the insulated wire 3, respectively. Both ends of the primary winding 5b are internal conductors 3 respectively.
c, 3d. Inner conductors 3a, 3b, 3
The insulated wire 3 having c and 3d is led out of a hole of the insulated housing 4b, and the insulated wire 3 is firmly fixed to the connector 4 by tightening the cylindrical rubber bush 4f with the fastening ring 4e and the insulated housing 4b. . This connector 4 and discharge lamp 1
And the contacts 4c, 4c of the connector 4
4d, contacts 1d and 1e provided on the base 1c of the discharge lamp 1 are fitted and connected, respectively.
Is supplied to the discharge lamp 1.

In FIG. 3, a lighting device 2 includes a power supply circuit (current control circuit) 2a for supplying power during stable lighting, a DC power supply circuit 2b, a switch element 2c composed of an FET, and a switch element drive circuit 2d. The switch element 2c is turned on or off by the switch element drive circuit 2d.
The output lines 2e and 2f of the power supply circuit 2a are connected to the internal conductors 3a and 3
b, respectively, are connected to one ends of secondary windings 5c, 5d of a step-up transformer 5, which is one component of the starting circuit , and the other ends of the secondary windings 5c, 5d are connectors 4 Are connected to the contacts 4c and 4d, respectively. The output line 2g of the DC power supply circuit 2b and the output line 2h via the switch element 2c are connected to the primary winding 5b of the step-up transformer 5 via the internal conductors 3c and 3d, respectively.

With this configuration, after the switch element 2c is turned on by a signal from the switch element drive circuit 2d, a high voltage is generated in the primary winding 5b of the step-up transformer 5 at the moment when the switch element 2c is turned off. , 5d, a voltage boosted according to the turns ratio is induced, and a pulse voltage of about 14 kV is applied to the connector 4.
Contacts 4c and 4d and contact 1 of the discharge lamp 1
The discharge lamp 1 is applied to the discharge lamp 1 via d and 1e, and the discharge lamp 1 starts and lights up. Therefore, the voltage applied to the insulated wire 3 is about 14 kV output voltage of the secondary winding of the step-up transformer in the conventional discharge lamp device, whereas the voltage applied to the insulated wire 3 is the primary winding of the step-up transformer 5 in the high-pressure discharge lamp device of the present embodiment. Line 5
It may be several hundred volts for supplying to b.

As described above, in the high-pressure discharge lamp device according to the embodiment of the present invention, since the discharge lamp 1 and the step-up transformer 5 are close to each other, the routing distance of the high-pressure charging section can be shortened. For this reason, the high voltage necessary for starting the discharge lamp 1 is boosted by the boosting transformer 5 built in the connector 4 and applied to the discharge lamp 1, so that the output voltage for lighting the lamp is reduced to the conventional discharge voltage. It can be set lower than the lamp device, and a low-voltage specification can be used for the insulated wire 3, so that the diameter can be reduced and the handleability can be improved. In addition, the risk of electric shock can be reduced, and the occurrence of unnecessary radiation noise and a decrease in pulse voltage can be suppressed with a simple configuration. Further, since the discharge lamp 1 is connected to the lighting device 7 via the connector 4, the attachment and detachment of the discharge lamp 1 becomes easy.

[0012]

As described above, in the high-pressure discharge lamp device of the present invention, the output voltage of the lighting device for supplying the high-pressure discharge lamp can be set lower than that of the conventional high-pressure discharge lamp. Can be used as an insulated wire for electrically connecting the wires, and the handleability can be improved. In addition, there is no danger of electric shock, and the generation of unnecessary radiation noise and a decrease in pulse voltage can be suppressed with a simpler configuration. Furthermore, high
Since it is pressure discharge lamp mounting or removal, lamp replacement can be easily performed.

[Brief description of the drawings]

FIG. 1 is an exploded front view showing a high-pressure discharge lamp device according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the same exploded view.

FIG. 3 is also a circuit diagram

FIG. 4 is a front view showing a conventional high-pressure discharge lamp device.

[Explanation of symbols]

1 High-pressure discharge lamp 2 Lighting device 3 Insulated wire 4 Connector 5 Step-up transformer

Claims (1)

(57) [Claims] 1. A power supply circuit for supplying electric power, and
A lighting circuit comprising a starting circuit for generating a voltage;
An insulated wire having one end connected to a lighting circuit;
At the other end, a connector to which a high pressure discharge lamp is to be connected
And the step-up transformer of the starting circuit is connected to the connector.
Built-in and secondary winding of the step-up transformer
Is connected to the power supply circuit, and generates a high voltage at startup.
To be applied to the primary winding.
A high-pressure discharge lamp device.