JPS6072197A - Device for firing discharge lamp - 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] [Technical Field of the Invention] The present invention provides a discharge lamp lighting device, in particular, an auxiliary electrode is provided in the discharge lamp to maintain the ionized state of gas inside the tube even when the discharge lamp is not lit. This article relates to measures to extend the life of discharge lamps.

[Technical background of the invention and its problems]

For example, the display image of discharge lamps used as pixels in large display devices installed at baseball stadiums and the like changes at a 60 Hz cycle, so the lighting time is controlled and dimmed at this cycle.

Therefore, when the lamp is turned on and off frequently, and the extinction period is not constant, and the extinction period becomes longer due to dimming, the gas inside the discharge lamp tube returns from an ionized state to a non-ionized state. , the next time the light is turned on, a high voltage is required at the beginning, and as a result, the ions accelerated by the high voltage have a large interlocking energy, and these ions [7
There is a problem in that the wLK collision causes severe wear on the electrodes and shortens their lifespan.

Therefore, an auxiliary electrode is attached to the tube body of the discharge lamp, and this auxiliary N1 pole and a pair of 9 poles (for lighting purposes, to distinguish from the auxiliary electrode, will be referred to as the main electrode from now on). Even when a power source for separation is applied between one of the auxiliary electrodes and one of the main electrodes, and a power source for lighting is not applied between a pair of piezo electrodes, the auxiliary electrode It was considered to maintain the gas inside the tube in an ionized state by performing an auxiliary discharge.

In this case, a current-limiting impedance element for auxiliary lightning is provided between the auxiliary electrode and the power supply for remote use, but the auxiliary discharge between the 9-pole auxiliary pole and the corresponding live electrode does not ionize the gas. It is said that the power source for gas ionization applied between the auxiliary electrode, the main lightning, and the beam is attenuated by the stray capacitance between the five poles of both cylinders. There was a problem, especially when the power source was a high frequency power source, the effect was likely to be large.

[Purpose of the invention]

Kisha's plan was developed in consideration of the points mentioned above, and effectively maintains the ionized state of the gas inside the tube by reducing the influence of stray capacitance between the auxiliary electrode and the corresponding main electrode. conduct,
This is an attempt to increase the effect of extending the life of discharge lamps.

[Requires invention Ml]

The discharge lamp lighting device of the present invention has a bent tube with both ends facing the same direction, and a pair of piezo electrodes built into both ends of the tube are used for lighting! A gas 1iill is connected to the lamp which is lit by discharging between the pair of main N1 poles when a source is applied, and one of the pair of main N1 poles provided on the tube wall in the middle of the discharge lamp. The high frequency power supply is applied to the corresponding main '\iS
, an auxiliary electrode that maintains the gas in the tube in an ionized state by auxiliary discharge between the electrodes, and an auxiliary electrode that holds both ends of the tube and projects the middle part of the tube to one side thereof. holder and
The inside of this holder t7t is characterized by being equipped with the above-mentioned auxiliary discharge current-limiting impedance element disposed in an example part of this holder.

[Embodiments of the invention]

A discharge lamp lighting device of the present invention will be described in detail based on an embodiment shown in the drawings.

In Figure 1, (1) is a discharge lamp;
has a tube body (2) bent in a U-shape, and this tube body (1
) have built-in main cylinders 8i, (3) and (4), respectively.

Both ends of the tube body (2) of this discharge lamp (1) are held in a holder (51K), and the middle part of the tube body (2) is held in a holder (51K).
) is protruded from the negative side.

Further, a lamp housing (6) partially or entirely formed of a translucent moon is attached to the negative side of the hole (5), and the discharge lamp (1) is mounted in this lamp housing (6). Holder (5) with 'lx covered
Two pairs of pin terminals (7) are removed on the other side, and this 6
The pair of bin terminals (7) is the main 'Rg of the lamp (1) when the above discharge occurs.
(3) Connected to (4).

Further, an auxiliary electrode (8) is attached to the middle part of the tube body (2) of the discharge lamp (1), in this embodiment, inside the bent part of the central part of the tube body (1). ) connected to IJ
A - lead wire (9) passes between the U-shaped tube body (2) and is led out from the - side of the holder (5) to the other side, and connects the auxiliary electrode (8) and the holder. (5), that is, between the U-shaped tubes (2) in the housing (6), the current limiting resistor 00 as a current limiting impedance resistor is located above F'J. - connected in series to the lead wire (9).

As shown in Fig. 2, the main M, camphor (3) (4'l) of the lightning and lamp (1) are connected to an inverter with N<1 as a lighting power source via the bin terminal (7), respectively. The main electrode (4) and the auxiliary electrode (8) on one side of the discharge lamp (1) are connected to the circuit α°C, and the high-frequency electricity for gas ionization is connected to the main electrode (4) and the auxiliary electrode (8) on one side of the discharge lamp (1) via the bottle terminal (7) and the lead wire (9). , are connected to the second inverter circuit α2 as a source.

Next, the operation will be explained. For example, when the discharge lamp (1) is used as the image (5) of a large display device as described above, the first inverter circuit α
η is illuminated by controlling the output period of the high frequency output at a cycle of 60 Hz in response to changes in the displayed image, and is repeatedly turned on and off.

When using this large display device, the high frequency output is always auxiliary from the second inverter circuit (b).

A corresponding main voltage is applied between the pole (8) and the pole (4), and an auxiliary discharge is caused between the auxiliary electrode (8) and the main electrode (4) to discharge the gas in the tube body (2). In addition to maintaining the electrodes (8) and (4) in an ionized state, the auxiliary discharge when both electrodes (8) and (4) are open is controlled by the current limiting resistor 01.

By the way, in the circuit shown in Figure 2, the electric path Q■ between the second inverter circuit O2 and the auxiliary W pole (8) and the electric path (A) between the second inverter circuit (C) and the main electrode (4)
Stray capacitance (a) is generated in each part between
However, since the circuit is close to the auxiliary electrode (8) as shown in Figure 3, the current limiting resistor head as shown in Figure 4 is used as an auxiliary electrode.
l Wj, compared to the part separated from (8), due to the influence of stray capacitance, (a), the attenuation of the high frequency power source can be reduced, and the gas box in the QW body (2), The separation state can be maintained effectively and reliably, and therefore, the life of discharge (1) can be extended.

In addition, since the current limiting resistor α0) is located between the U-shaped tube bodies (2), there is no difference in the light distribution of the discharge lamp (1).
・Since it does not cause any damage and can be held on the auxiliary electrode (8) and holder (5) via the lead wire (9), special support is required to hold the current limiting resistor α (J). There is no need to provide sections.

In this embodiment, the current limiting resistor Oo is held via the lead wire (9), but it may be held directly on the holder (5).

〔Effect of the invention〕

As described above, according to the present invention, an auxiliary electrode is attached to the tube body of the discharge lamp, and an auxiliary discharge is caused between the auxiliary electrode and the main electrode of the discharge lamp, so that the gas in the tube is turned off when the discharge lamp is turned off. In a discharge lamp lighting device, the current-limiting impedance resistor is placed close to the auxiliary electrode in a discharge lamp lighting device that is kept in an ionized state at times, thereby preventing parabolism and shortening of lamp life due to repeated turning on and off. Therefore, the influence of the stray capacitance of IIJ between the auxiliary electrode and the main 4-pole can be reduced, and therefore the gas force and thermal state can be maintained effectively and appropriately, promoting a longer life of the discharge month. can.

[Brief explanation of the drawing]

The figures show one embodiment of the discharge lamp lighting system of the present invention, Fig. 1 is a T414 side view of the discharge lamp, Fig. 2 is its circuit diagram, and Figs. 3 and 4 are diagrams explaining its operation. , Fig. 3 shows an example of the present invention, and Fig. 4 shows an example in contrast to the present invention. (1)...discharge lamp, (2)...tube, (31(4)...
Main Raichair, (5)...Holder, (8)...Sodesuke Shimogoku, 0υ
Current limiting resistor as a current limiting impedance element, 01J
...First inverter circuit as a power source for fishing (c)
Φ Gas-1 separation high frequency frost, second inverter circuit as a source.

Claims (1)

[Claims] (1) It has a tube body bent with both sides facing the same direction.Lighting power is applied to a pair of main poles built into both ends of the tube body, and a discharge occurs between the pair of main electrodes. A high-frequency power source is applied between the discharge lamp, which is lit, and one of the main neck and poles of the upper pair of devices provided on the tube wall in the middle of the discharge lamp, and the corresponding main electrode is applied. An auxiliary electrode that discharges auxiliary lightning in the dark to maintain the gas inside the tube in an ionized state, and an auxiliary electrode that holds both ends of the sacrificial and phantom tube body and protrudes from the middle part of the tube body on one side. 1. A discharge lamp lighting device comprising: a holder; and the auxiliary lightning current-limiting impedance element disposed within the holder or on one side of the holder.