JPS62195899A - Discharge lamp burner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention] (Industrial Application Field) The present invention relates to a discharge lamp lighting device for controlling high-frequency lighting of a cold star 1-shaped discharge lamp.

(Prior Art) Conventionally, as such a discharge lamp lighting device, those shown in FIGS. 4 and 5 are known. What is shown in Figure 4 is
Connect the input end of a nine-frequency inverter circuit 3 having an optical Pit 1 and a lance 2 at the output part to the DC power supply 1, and connect each end of the output winding 2S of the oscillation 1 to lance 2 in the inverter circuit 3 for high frequency current limiting] For example, a cold start type discharge lamp 6 such as a rare gas discharge lamp is connected via the capacitors 4 and 5, respectively.
are connected. A proximal conductor 7 is attached to the tube wall of the discharge lamp 6 in order to improve starting performance. Note that the high frequency inverter circuit 3 includes, for example, a pair of transistors 8 and 9.
A push-pull type is used. Also,
In the one shown in FIG. 5, a discharge lamp 6 is connected to the output winding 2S of the oscillation transformer 2 via one high-frequency current-limiting capacitor 4.
Moreover, one end of the proximity conductor 7 is connected to one of the external leads of the discharge lamp 6.

(Problem to be solved by the invention) However, in such a device, the close conductor 7 fills the
Although the starting performance of the lamp 6 was improved, the potential distribution of the tube wall of the discharge lamp was different, and the current value flowing through the bundled adjacent conductor and the surface of the tube wall was different, which caused the problem that the brightness of the discharge lamp was not uniform. . This is thought to be due to the influence of the leakage resistance and capacitance between the electrodes of the discharge lamp, the tube ends, and the tube inner and outer wall assembly n, the leakage resistance of the tube and inner wall surfaces, and the capacitance between the tube and inner and outer walls.

This invention was made to solve these problems, and its purpose is to provide a discharge lamp lighting device that can make the brightness distribution of the discharge lamp uniform even when a nearby conductor is provided to assist in starting. It is about providing.

[Structure of the Invention] (Means for Solving Problems) This invention connects a cold start type discharge lamp to a high frequency inverter circuit provided with an oscillating h-lance at the output section via a first high frequency current limiting impedance element. At the same time,
In cases where a nearby conductor is attached to the tube wall of the discharge lamp to assist in starting, the conductor may be connected directly between the nearby conductor and the output winding of the oscillation transformer, or through the first high-frequency current limiting impedance element. A second high frequency current limiting impedance element is connected.

(Function) In the present invention having such a configuration, the second high-frequency current-limiting impedance element is connected directly between the adjacent conductor and the output winding of the optical oscillation transformer, or via the first high-frequency impedance cable. Since these are connected, it is possible to reduce the effects of leakage resistance and capacitance between the electrodes of the discharge lamp, the tube ends, and the inner and outer walls of the tube, as well as the leakage resistance and capacitance of the tube inner and outer wall surfaces.
The tube wall potential distribution can be made uniform.

(Embodiment) FIG. 1 shows an embodiment of the present invention, in which a DC type m1
1 is connected to a high frequency inverter circuit 13 having an oscillation transformer 12 at its output section. At each end of the output winding 12s of the oscillation transformer 12 in the inverter circuit 13,
Each electrode 16a of a cold star 1-type discharge lamp 16, such as a rare gas discharge lamp, is filled with, for example, xenon or krypton via a high-frequency current-limiting capacitor 14, 15, which is a high-frequency current-limiting impedance element.

16b is connected. The structure of the electrode of the discharge lamp 16 may be either a cold cathode or a preheated electrode, as long as the starting method is a cold start type.

A proximal conductor 17 is attached to the discharge lamp 16 on its tube wall, spanning from the position of one electrode 16a to the position of the other electrode 16b. The other electrode 16b of the adjacent conductor 17
A high-frequency current-limiting capacitor 18, which is a second high-frequency current-limiting impedance element, is connected between a position near the oscillation transformer 12 and one end of the output @112s of the oscillation transformer 12.

The high frequency inverter circuit 13 is of a push-pull type having a pair of NPN transistors 21, 22, the collectors of each of which are connected to each end of the input winding 12p of the oscillation transformer 12, Its emitters are connected together. The bases of the transistors 21 and 22 are connected to each end of the base winding 12b of the oscillation transformer 12 through resistors 23 and 24, and the bases of the oscillation I-lance 12 are connected through resistors 25 and 26, respectively. It is connected to the neutral point t of the input winding 12p. Note that a capacitor 27 is connected in parallel to the input winding 121) of the oscillation lance 12.

A capacitor 30 is connected to the DC type 111 via a diode 28 and an inductance coil 29, and one terminal of the capacitor 30 is connected to the oscillation transformer 12.
It is connected to the neutral point t of the input winding 12p, and the other terminal is connected to the emitter of each of the transistors 21 and 22.

In this embodiment having such a configuration, the inverter circuit 1
3 is applied with a DC voltage from the DC power supply 11 to cause self-excited oscillation, and generates a high frequency voltage in the output winding 12s of the oscillation 1 Herance 12. This high frequency voltage is applied to each electrode 16 of the discharge lamp 16 via each high frequency current limiting capacitor 14, 15, 18.
a, 16b and the adjacent conductor 17, and the discharge lamp 17 is quickly started and lit with the starting assistance provided by the adjacent conductors 6 and 17.

When the discharge lamp 16 is turned on, a high frequency voltage is applied to the adjacent conductor 17 from the output winding IJ12s via the capacitor 18. As a result, in the discharge lamp 16, the influence of the electric currents w116a, 16b, the leakage resistance and capacitance between the tube ends and the tube inner and outer walls, and the leakage resistance and capacitance of the tube inner and outer wall surfaces is reduced, so that the tube wall potential distribution is approximately It becomes even. Therefore, the light distribution characteristics are uniform throughout the discharge lamp 16, and the brightness distribution is uniform. Moreover, in this embodiment, the connection of the capacitor 18 to the adjacent conductor 17 is on the opposite polarity side from one end of the output winding 128 to which the capacitor 18 is connected, that is, on the side closer to the N pole 16b. The uniformity of the tube wall potential distribution becomes better, and the brightness distribution of the tIi lamp 16 becomes more excellent and uniform.

Next, another embodiment of the invention will be described with reference to the drawings.

It should be noted that the same parts as in the previous embodiment are given the same reference numerals, and only the main parts will be described.

One of the other embodiments, as shown in FIG. 2, is one in which the capacitor 15 is omitted from the previous embodiment, and even if this is done, the tube wall potential distribution of the discharge lamp 16 is not affected to the same extent. The same effects as in the above embodiment can be obtained.

In yet another embodiment, as shown in FIG.
In addition to the capacitor 18, another high-frequency current-limiting continuum 119 is connected between the other end of the discharge lamp 16 as a second high-frequency current-limiting impedance element. The distribution becomes even more uniform, and a more uniform distribution of brightness is obtained by 1q.

Furthermore, one of the other embodiments is as shown in FIG. A frequency current limiting condenser 20 is connected to the discharge lamp 16. Even in this way, the tube wall potential distribution of the discharge lamp 16 can be made uniform and the same effect as in the previous embodiment can be obtained.

In the above embodiments, a push-pull type high frequency inverter circuit is used, but the present invention is not necessarily limited to this, and a square type high frequency inverter circuit may also be used. Further, in the embodiment described above, a capacitor is used as the second high-frequency current limiting impedance element, but the present invention is not necessarily limited to this, and a resistor or the like may be used.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a discharge lamp lighting device that can make the brightness distribution of the discharge lamp uniform even if a nearby conductor is provided for starting assistance.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing one embodiment of this invention, FIGS. 2, 3, and 4 are main circuit diagrams showing other embodiments of this invention, and FIGS. 5 and 6 are conventional circuit diagrams. FIG. 2 is a circuit diagram showing an example. 11... DC power supply, 12... Oscillation transformer, 13.
...^ Frequency inverter circuit, 14.15...High frequency current limiting capacitor (first high frequency current limiting impedance element), 16...Cold start type hII lamp,
17... Proximity conductor, 18.19.20... High frequency current limiting capacitor (second high frequency current limiting impedance element). Applicant's representative Patent attorney Takehiko Suzue Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A high frequency inverter circuit with an oscillation transformer installed in the output section, and a first
A cold start type discharge lamp connected via a high frequency current limiting impedance element, a nearby conductor attached to the tube wall of this discharge lamp, and a direct connection between this nearby conductor and the output winding of the oscillation transformer. or a second high-frequency current-limiting impedance element connected via the first high-frequency current-limiting impedance element.