JPH0525165Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrode for a discharge lamp used in a cold cathode discharge lamp or the like.

[Conventional technology]

This type of electrode includes a plate electrode and a cylindrical electrode, and examples of their structures are shown in FIGS. 3 and 4.

FIG. 3 shows a plate-shaped electrode in which a getter part 32 made of zircon/aluminum is formed on a predetermined part of one side of an electrode body 31 made of a nickel-plated iron plate, and a getter part 32 made of zircon/aluminum is made of an amalgam with mercury titanide on the back side. The structure is such that the material 33 is fixed, and the electrode main body 31 is connected to the lead-in wire 35 supported by the stem 34 by spot welding.

FIG. 4 shows a cylindrical electrode, in which a cylindrical electrode main body 41 is formed of a material made of nickel plated iron plate, a getter storage part 42 having an L-shaped cross section is fixed to the tip of the main body 41 by spot welding, and the inside is Getter ring (formed into an O-ring shape using iron and nickel, and getter material (zircon, aluminum) inside it
The electrode main body 41 is connected to a lead-in wire 45 supported by a stem 44 by spot welding.

[The problem that the idea aims to solve]

However, in such a structure, since the getter part and the mercury-containing part are arranged in the main parts of the inflow and outflow parts of the discharge current, the getter material and the titanium material for fixing mercury are easily sputtered by ions, and the lamp electrode part An early blackening phenomenon occurs, which shortens the effective light emission length of the lamp and reduces the amount of light.

Furthermore, the cylindrical electrode shown in FIG. 4 requires a hook-like process at the tip of the electrode main body 41 to form a getter storage portion, which has the problem of poor workability.

An object of the present invention is to provide an electrode for a discharge lamp that can prevent sputtering of the getter material and simplify manufacturing.

[Means to solve the problem]

The present invention is characterized in that the electrode body has a cylindrical shape with a narrow base, and a required number of ring getters are attached to the narrow diameter part and fixed by caulking at the ends of the narrow diameter part.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

Figures 1 and 2 show an embodiment of the present invention, in which the electrode main body 1 has a cylindrical shape with a narrower diameter at the base, and the required number of electrodes (the number that matches the characteristics of the lamp) is provided in the narrower diameter part 1A. For example, after two ring getters 2 are attached, the ring getters 2 are fixed by caulking the caulking portions 1B.

The electrode body 1 is formed using iron, nickel, an alloy of iron and nickel, a material made of iron plated with nickel, or a tantalum titanium niobium material having a getter action.

In addition, the ring getter 2 is one in which zircon/aluminum having a getter action and mercury titanide containing mercury are integrally stored in a groove-shaped getter storage portion 2A on one end surface of the ring, and the gap between the ring getters is 0.1 to 0.1. Set to 0.5mm.

Note that 4 is an inlet wire, 5 is a stem portion, 6 is a lamp envelope (glass tube), and 7 is an exhaust pipe, and the electrode body 1 is connected to the inlet wire 4. The stem flare and the lamp envelope 6 are welded together, and after being filled with an appropriate amount of inert gas as a discharge lamp, the exhaust pipe 7 is
is sealed.

With this structure, the ring getter 2 is located at the root portion of the electrode body 1 in a manner facing outward, and ions are prevented from entering the getter material during discharge. As a result, the getter material is less likely to be sputtered by ions, blackening is significantly reduced, and the getter effect is maintained for a long period of time. This is because when the getter material is sputtered by ions and adheres to the envelope 6, it becomes ineffective as a getter material and conversely, it re-releases the impurity gas that has been adsorbed as a getter, but the present invention prevents this phenomenon. It is from.

Further, when the ring getters 2 have a gap of 0.1 to 0.5 mm, the getter adsorption properties are stabilized. Furthermore, by providing this gap, mercury can be easily released into the lamp during the lamp manufacturing process (mercury release process from the ring getter).

[Effect of idea]

As described above, according to the present invention, the electrode body has a cylindrical shape with a narrow base, and the required number of ring getters are attached to the narrow diameter part, so it is possible to prevent ions from directly entering the getter, and the lamp It can greatly contribute to preventing blackening around the electrode part, and the getter effect can be maintained for a long period of time, thereby stabilizing the characteristics. In addition, in the case of multiple ring getters, the gap between them is set to 0.1 to 0.5 mm, so
In addition to stabilizing getter adsorption, mercury can be easily released from the ring getter during the lamp manufacturing process. Furthermore, since the ring getter is fixed by caulking, the getter material can be fixed easily and reliably. Moreover, it has the advantage of eliminating metal oxidation due to welding.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the discharge lamp electrode according to the present invention, Fig. 2 is a half sectional view of the same embodiment, and Figs. 3 and 4 are perspective views showing conventional examples. be. DESCRIPTION OF SYMBOLS 1... Electrode body, 1A... Thin diameter part, 1B... Caulking part, 2... Ring getter, 2A... Getter storage part, 4... Lead-in wire, 5... Stem part.

Claims (1)

[Scope of utility model registration request] An electrode for a discharge lamp, characterized in that the electrode body has a cylindrical shape with a narrow base, a required number of ring getters are attached to the narrow diameter part, and the ends of the narrow diameter part are fixed by caulking.