JPS5819813Y2 - Discharge lamp with preheating electrode for starting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a discharge lamp equipped with a starting preheating electrode to facilitate starting.

It is common for high-pressure mercury lamps and the like to be provided with a starting preheating electrode to facilitate starting.

A portable discharge lamp usually comprises a pair of main electrodes 1, 2 and at least one starting preheating electrode 3 adjacent thereto, as shown in FIG.

When starting, the starting preheating electrode 3 is energized to promote ionization of the substance sealed in the arc tube, and the main electrodes 1, 2
Facilitate discharge between.

When discharge starts, the preheating circuit is opened by a thermally responsive switch 4 provided externally.

Conventionally, the starting preheating electrode portion of such a discharge lamp often has a structure as shown in FIG.

That is, linear legs 5, 6 are provided at both ends of the starting preheating electrode 3, one of them 5 is connected to the main electrode 2 or another lead-in conductor 1 connected thereto, and the other 6 is connected to another lead-in conductor 8. It is a structure connected to the

FIG. 3 is a side view of the turning section.

However, with this structure, the tip of the extremely thin linear leg is welded to the main electrode or lead-in conductor, which not only makes assembly difficult, but also makes it difficult to assemble after assembly because the entire starting preheating electrode is supported only by the linear leg. When vibrations are applied, the starting preheating electrode 3 comes into contact with the main electrode, and the straight legs 5 and 6 tend to break.

Furthermore, if the arc spont that should be generated at the tip of the main electrode 2 during lighting of the discharge lamp moves to the starting preheating electrode 3 for some reason, the linear leg 5 which is mechanically and thermally weakest.
Accidents such as melting at the , 60 section were also likely to occur.

The present invention was developed in view of the above points, and aims to provide a discharge lamp equipped with a starting preheating electrode that is easy to assemble, resistant to mechanical shock and thermal shock, and of stable quality. That is.

FIG. 4 shows a part of the starting preheating electrode, and FIG. 5 shows a side view thereof.

2 is a main electrode, and 3 is a starting preheating electrode.

Both ends of this starting preheating electrode 30 are coiled legs 9 and 10, into which core frames 11 and 12 are inserted, respectively.

One end of the core frame LL12 is connected to the lead-in conductors 7, 8 of the arc tube hermetic sealing part 13 together with the coiled legs 9, 10.

The other ends of the core frames 11 and 12 are enclosed in the arc tube together with the starting preheating electrode 3.

The coiled legs 9 and 10 are arranged at the tips of the core frames 11 and 12 at an appropriate angle θ with respect to the core frames 11 and 12 so that the starting preheating electrode 3 does not come into contact with the main electrode 2. It is bent in the vicinity.

The bending angle θ varies depending on the shape and dimensions of the main electrode 2, but is generally desirably 45 degrees or more.

Moreover, in order to maintain such an angle, it is sufficient to first bend it by mechanical means and then perform heat treatment.

Such a structure has the following advantages.

First, since both ends of the starting preheating electrode are coiled and a core frame is inserted into the coiled portions, welding to the lead-in conductor is easier than when connecting thin straight legs directly, making assembly work less difficult. can be solved.

Furthermore, since the coiled leg and the core frame are welded together to the lead-in conductor, the starting preheating electrode will not come off or come off the core frame.

Secondly, the entire starting preheating electrode is not supported by straight legs, but by the coiled leg and the core frame inserted into it, so it is resistant to mechanical shock, and even if vibration is applied, the starting Accidents such as the preheating electrode breaking or coming into contact with the main electrode are rare.

In addition, since there is no straight leg that is the weakest point in terms of heat, it is resistant to thermal shock, and even if the arc spot of the main electrode moves to the starting preheating electrode during lighting, there is almost no chance that the electrode will melt. Who?

Thirdly, since the coiled leg of the starting preheating electrode is bent near the tip of the core frame, the part to be bent can be easily determined and a structure with stable quality can be provided. .

Furthermore, by selecting the bending angle within a certain range, contact between the starting preheating electrode and the main electrode can be more reliably prevented.

[Brief explanation of the drawing]

Fig. 1 is a principle diagram of a discharge lamp equipped with a starting preheating electrode, Figs. 2 and 3 are a front view and a side view of a conventional starting preheating electrode section, and Figs. 4 and 5 are from the book. FIG. 2 is a front view and a side view of the starting preheating electrode section according to the invention. In FIGS. 4 and 5, 2... main electrode, 3
...Starting preheating electrode, 1,8...Introduction conductor, 9゜10...Coil-shaped leg, 11,12
... Core frame.

Claims (1)

[Scope of utility model registration request] For a discharge lamp equipped with a pair of main electrodes and at least one starting preheating electrode, a core frame is inserted into the coiled legs at both ends of the starting preheating electrode, and one end of the core frame is used to emit light together with the coiled legs. At the same time, the other end of the core frame is enclosed in the arc tube together with the starting preheating electrode, and the coiled leg of the starting preheating electrode is bent near the tip of the concentric frame. A discharge lamp equipped with a preheating electrode for starting.