JPS6013173Y2 - discharge lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a discharge lamp equipped with a metal capsule for supplying the required amount of mercury to the space inside the bulb.

Generally, during the exhaust process of a discharge lamp, a certain amount of mercury is sealed inside the bulb through the exhaust pipe from the exhaust head, but because the temperature of the bulb is high during the exhaust operation, a certain amount of mercury is sealed inside the bulb. A considerable amount of mercury evaporates shortly after.

The mercury vapor then dissipates into the vacuum system (exhaust system), and most of it is condensed in the trap, but some of it is released from the vacuum pump to the outside and tends to contaminate the working environment.

In addition, the amount of mercury sealed in the bulb is about 3 to 5 times greater than the required amount, taking into account dissipation into the vacuum system, which is not preferable from the point of view of effective use of resources.

Therefore, as shown in Figures 1 and 2, the originator is
Electrodes are connected to the tips of two strut lines C9C extending from the stem B sealed at the end of the bulb A, and a ring-shaped metal member F having a space E is arranged near the electrodes. At the same time, a metal capsule G formed by incorporating a required amount of mercury in this metal member F and crushing and sealing the opening is positioned so that the space E is bridged, and one crushed part H is placed so that the space E is bridged. We proposed a discharge lamp welded to a metal member F.

According to this discharge lamp, the mercury in the metal capsule G is supplied to the space inside the bulb by high-frequency heating of the metal member F1 and the metal capsule G after the completion of the exhaust operation, so that mercury vapor is released from the exhaust system to the outside. Therefore, there is no contamination of the working environment, and since the metal capsule G contains the minimum amount of mercury necessary for a discharge lamp, resources can be used effectively. During high-frequency heating of the metal member F and the metal capsule G, the metal capsule G is concentrated because the metal capsule G is smaller than the metal member F and is welded to bridge the space E. Since the mercury is heated to a temperature of

However, this metal capsule G has a width of, for example, 2 to 3 r.
IgR1 total length is 5rIrIn1 crushed part H length is 21r
Since it is extremely small, about the size of rIIt, great care must be taken when fixing it to the metal member F.

In particular, when fixing by welding is used, the wall thickness of the metal capsule itself is small, and depending on the welding conditions, the crushed part H may melt, or even the fused part may extend to the un-collapsed part, causing mercury to escape. It has the disadvantage of leakage.

In view of these points, the present invention provides a discharge lamp in which the metal capsule can be easily fixed to a metal member, and leakage of mercury due to damage to the un-collapsed portion can be completely eliminated.Examples will be described below. .

In FIGS. 3 to 6, 1 is a bulb, and a fluorescent material 2 is coated on the inner surface of the bulb.

3 is a stem sealed at the end of the valve 1; 4, 4 is a strut line that is planted on the stem 3 and extends into the interior space of the valve; 5;
is an electrode such as a filament coil connected between the ends of the strut wires 4, 4.

6 is a ring-shaped metal member disposed to surround the electrode 5; 7 is a nonvolatile getter made of, for example, zirconium-aluminum, coated on the inner surface; 8 is a metal member 6;
This is a space formed between the ends 6a and 6b.

Incidentally, the non-volatile getter 7 is attached to the outer surface of the metal member 6 and the support wire 4.
It can also be applied to the surface, or it can be omitted.

Reference numeral 9 denotes a support wire that supports the metal member 6 while electrically insulating it from the support wire 4. The support wire 9 is installed on the stem 3.

Note that the metal member 6 can also be arranged so as to be separated from the electrode 5 toward the non-discharge space, and in particular in this case, the support wires 4, 4
It can also be supported by connecting to either one of them.

A metal capsule 10 is welded to the ends 6a and 6b of the metal member 6 so that a space 8 is bridged therebetween, and has, for example, a bottomed cylindrical uncollapsed part 11 and a crushed part 12. 11 contains a required amount of mercury 13.

Incidentally, this metal capsule 10 is manufactured, for example, as shown in FIG. 7.

That is, first, as shown in FIG. to store.

Next, as shown in c in the same figure, a cylindrical opening 12' having a diameter larger than that of the bottomed cylindrical portion 11 is crushed and sealed.

After that, the ends of the crushed portion 12 are welded to complete the manufacturing.

The thickness of the crushed portion 12 is set to be smaller than the thickness of the unsqueezed portion 11.

Reference numeral 14 denotes a separation portion formed between the metal capsule portion and the metal member 6, excluding the welded portion between the crushed portion 12 of the metal capsule 10 and the ends 6a, 6b of the metal member 6; for example, the crushed portion 12
is formed by bending a portion of the metal member 6 that is close to the non-squashed portion 11 so that the non-squashed portion forms an inclination angle of θ=20 to 70° with respect to the metal member 6.

Next, a method of fixing the metal capsule 10 to the metal member 6 and a method of supplying the mercury 13 to the interior space of the bulb in the metal capsule 10 will be explained.

First, a non-volatile getter 7 is coated on the inner surface of an elliptical metal member 6 having a long diameter part and a short diameter part, and the electrode 5 is surrounded by this metal member 6, and the end of the support wire 9 is attached to a part of the metal member 6. to weld.

Then, in the metal capsule 10, the portion of the crushed portion 12 close to the uncrushed portion 11 is set relative to the horizontal plane with θ=20 to 7Cf'.
After bending the metallic member 6 so that are superimposed and welded so that the space 8 is bridged.

As a result, a separation part 14 is formed between the uncrushed part 11 of the metal capsule 10a and the metal member 6.

Note that the separation portion 14 can also be formed by separating the unsquashed portion 11 from the metal member 6 after welding the metal capsule 10 to the metal member 6.

The mount thus constructed is sealed to the end of a bulb 1 whose inner surface is coated with phosphor 2.

Next, this discharge lamp is connected to the exhaust system of the exhaust device to exhaust impure gas from the space inside the bulb.

The valve is then filled with a certain amount of inert gas, and the exhaust pipe is sealed with a burner or the like.

Thereafter, a high-frequency heating coil is arranged around the outer circumference of the bulb 1 so that a loop current flows through a closed circuit consisting of the metal member 6 and the metal capsule 10, and high-frequency heating is performed.

Then, a loop current flows through the metal member 6 and the metal capsule 10, but the space 8 of the metal member 6 collapses into the collapsed portion 1.
2, the loop current is concentrated in the crushed portion 12.

For this reason, the crushed portion 12 is heated much more rapidly than the metal member 6 and reaches a high temperature.

At the same time, the uncollapsed portion 11 also becomes high in temperature due to heat conduction from the crushed portion 12, and the vapor pressure of the built-in mercury 13 increases significantly.

When the mercury vapor pressure exceeds the sealing force of the collapsed portion 12, the wall thickness of the crushed portion 12 is set to be smaller than that of the uncollapsed portion 11, so that the mercury vapor pressure increases in the axial direction of the valve 1. An opening that substantially coincides with the non-discharge space is easily formed, and the mercury 13 in the uncollapsed portion 11 is discharged into the bulb interior space through this opening.

This mercury release takes place in about 1 to 2 seconds after high-frequency heating.

At this time, if the ends 6a and 6b of the metal member 6 are welded so that tension is applied to the metal capsule 10 when the metal capsule 10 is bridged, the capsule can be opened more stably.

Impure gas released during high-frequency heating of the metal member 6 and metal capsule 10 is quickly adsorbed by the nonvolatile getter 7 attached to the metal member 6, and the space inside the bulb is kept clean.

In this way, the metal capsule 10 is constructed such that the cylindrical part 11 of the bottomed cylindrical body 10' is filled with mercury 13.
Since it is constructed by crushing the opening 12' with a larger outer diameter, the crushed part 12 can be replaced with the bottomed cylindrical part (uncrushed part) 11.
The end portion 6 of the metal member 6 can be made sufficiently wide.
A sufficiently large welding margin can be provided when welding to AV 6 B.

For this reason, when welding the crushed portion 12 to the metal member 6, the welded portion can be sufficiently separated from the un-squashed portion 11, so that damage to the un-squashed portion 11 caused by the welding operation can be completely eliminated. Moreover, there is no leakage of mercury-13 at all.

In addition, since the metal capsule 10 is welded to the ends 6a and 6b of the metal member 6 so that the crushed portion 12 bridges the space 8, when the metal member 6 and the metal capsule 10 are high-frequency heated, the metal Since the capsule 10 is smaller than the metal member 6 and the separation part 14 is formed between the uncollapsed part 11 and the metal member 6, the capsule 10 is heated intensively and the uncollapsed part 11 is heated. The temperature of mercury 13 increases rapidly.

Therefore, the internal pressure of the uncollapsed portion 11 is increased to a pressure sufficient to open the collapsed portion 12 in a short time, and the mercury 13 can be reliably supplied to the inner space of the bulb.

In particular, the crushed portion 12 of the metal capsule 10 has a thickness smaller than that of the uncrushed portion 11, for example, the wall thickness t1 of the bottomed cylindrical portion 11 is set to 0.051, and the wall thickness of the opening portion 12' before crushing is set to 0.051. Since it is set to 0.0251 rgft, the opening of the crushing portion 12 during high-frequency heating can be facilitated, and the release properties of the ice-silver 13 can be further improved.

Further, in the metal capsule 10, the crushed portion 12 is the un-squeezed portion 1.
1, it is possible to improve the weldability to the metal member 6. For example, when the metal capsule 10 is supplied to the stem mounting process, it is possible to By supporting the protruding portion (shoulder portion) 12a nearby, automatic conveyance can be easily carried out, and directionality can be imparted, thereby improving assembly workability.

In this regard, according to the inventor's study, the diameter d of the cylindrical portion 11
1 in order of 1.78φ, and the diameter d2 of the opening 12' is 2.54.
When the final width of the crushed portion 12 after crushing is set in 4 order as φ,
Good results were obtained in terms of weldability, feedability, and mercury release.

Furthermore, since the metal capsule 10 is fixed to the metal member 6 so as to be substantially aligned with the axial direction of the bulb 1, the mercury 13 during high-frequency heating is released from the opening formed in the crushed portion 12 so that the mercury 13 is approximately aligned with the axis of the bulb 1. It is released into the matching internal valve space.

Therefore, the released mercury does not collide with the inner surface of the bulb, and peeling of the phosphor 2 can be reliably prevented.

Note that the present invention is not limited to the above embodiments in any way,
For example, the metal capsule may be a cylindrical body other than a cylindrical body with a bottom, and the wall thickness, diameter, width, etc. of each part thereof can be set arbitrarily within the scope of the purpose of the present invention.

As described above, according to the present invention, it is possible to easily fix the metal capsule to the metal member, eliminate leakage of mercury due to damage to the uncollapsed part during fixation, and furthermore, the opening of the crushed part is (openability) can be further improved, and excellent effects such as being able to supply mercury to the space inside the bulb within a short time can be obtained.

[Brief explanation of drawings]

Figure 1 is a side sectional view of the main parts of the discharge lamp, which is the premise of this proposal;
The figure is a cross-sectional view taken along line II in Figure 1, Figure 3 is a side cross-sectional view showing an embodiment of the present invention, Figure 4 is a cross-sectional view taken along ■--■ in Figure 3, and Figure 5 is a cross-sectional view taken along line 4 in Figure 3. ■-■ sectional view of Figure 6 is IV- of Figure 4.
The IV sectional view and FIG. 7 are a front sectional view and a side sectional view for explaining the method of manufacturing the metal capsule. In the figure, 1 is a valve, 3 is a stem, 4 is a strut line, 5 is an electrode, 6 is a metal member, 8 is a space, 10 is a metal capsule, 1
1 is an uncrushed part, 12 is a crushed part, and 13 is mercury.

Claims (1)

[Scope of utility model registration request] Electrodes are connected to two strut wires extending from the stem at the end of the bulb, a ring-shaped metal member with a space is placed near the electrodes, and a required amount of mercury is built into this metal member and an opening is placed. A metal capsule formed by crushing and sealing a portion is fixed so that the crushed portion bridges a space, wherein the crushed portion of the metal capsule is wider than the uncrushed portion, and the wall thickness of the crushed portion is thinner. A discharge lamp characterized in that the thickness is smaller than the wall thickness of the uncrushed part.