JPS6330105Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a bulb whose end is covered with a cap, such as in a high-pressure mercury lamp.

For example, in a high-pressure mercury lamp, a keyway is provided on the outer peripheral surface of the end of the glass bulb along the tube axis direction, and an external conductor led out from the end of the bulb is conducted through this keyway, and a cap is connected to the end of the bulb. The external conductive wire is soldered to the inside of the cap, and a portion of the solder is interposed in the keyway to prevent rotation of the cap.

However, the conventional keyway has a short end portion located inside the opening edge of the cap. Further, the end of the external conductor was positioned inside the cap so that it did not protrude from the edge of the cap opening. For this reason, it is difficult to pour solder into the key groove after the cap is capped, and there is a problem in that the cap and the valve and the cap and the external conductor cannot be bonded well.

In addition, because the conventional keyway has a shallow dish-shaped cross section, and the solder is a soft metal, it adheres to the mouthpiece side when a relative twisting force is applied to the mouthpiece with respect to the valve. As the cap rotates, the solder in the cap deforms to a certain extent, and as the cap rotates, it rides on the side wall of the keyway like a wedge and gets wedged between the cap and the valve, deforming the cap and causing damage to the valve. , which sometimes caused cracks.

This invention was developed based on these circumstances, and its purpose is to prevent deformation of the cap and cracking of the valve due to solder bite, and to effectively fill the keyway with solder. To provide a tube whose cap can be surely prevented from rotating.

An embodiment of this invention will be described below based on the drawings. In the figure, 1 indicates a bulb for a high-pressure discharge lamp, and 2 is an outer bulb made of glass. A threaded thread 2b is formed at the end of the neck portion 2a formed at one end of the valve 2, and a cap 4 is screwed into this threaded thread 2b to be crowned. Further, external conductive wires 5 and 6 are led out from the end of the bulb 2, and one of the external conductive wires 5 is soldered to the eyelet terminal 7 of the cap 4. The other external conductor 6 is located in a key groove 10 formed on the outer peripheral surface of the valve end along the tube axis direction and in a portion of the end of the key groove 10 that extends beyond the opening edge 4a of the cap 4. Therefore, even when the cap 4 is screwed into the thread 2b at the end of the valve 2, the external conductor 6 does not come off from within the keyway 10 and can be securely held within the keyway 10. Furthermore, the opening edge 4a of the cap 4 allows the external conducting wire 6 to be screwed in smoothly without causing any damage.

Next, the external conductive wire 6 is cut near the end of the keyway 10. At this time, the end of the keyway 10 has a shape in which a gap is formed between the external conducting wire 6 and the bulb 2, so that the external conducting wire 6 can be cut without causing any damage to the bulb 2.

Thereafter, the opening edge 4a of the cap 4 is soldered 11.

The solder 11 is interposed between the inner surface of the cap 4 and the keyway 10, so that the cap 4 is prevented from rotating. That is, to explain the keyway 10 in detail, the length of the keyway 10 in the tube axis direction is longer than the portion covered by the cap 4,
The end of the keyway 10 is exposed to the outside from the base opening edge 4a, and the solder 11 is loaded into the keyway 10 through this opening 12. In addition, as shown in FIG. 4, the keyway opening 1
The angle θ formed by the keyway side wall 10b with respect to the tangent x of the valve 2 at 0a is set in the range of 90° to 130°.

In addition, in FIG. 1, 14 is a stem, 15, 1
Reference numeral 6 denotes a support line which also serves as a power supply line, and these support lines 15 and 16 are electrically connected via a lead wire 18. Further, 19 is another power supply line. These power supply lines 19 and one support line 16
are electrically connected to electrodes (not shown) at both ends of the arc tube 17, respectively.

According to the bulb 1 having the above configuration, the end portion of the keyway 10 is exposed to the outside beyond the mouthpiece opening edge 4a, and the angle of the keyway side wall 10b is
The angle is set between 90° and 130°, and the external conductor 6 is led out to the vicinity of the opening edge 4a, so when pouring the solder 11 into the keyway 10 through the opening 12 at the end of the keyway 10, the solder 11 is It can easily flow into the keyway 10 along the conductor 6 and along the keyway side wall 10b, and can also be easily poured into the keyway 11 through the opening 12 to the inner surface of the cap 4 and the outer end of the valve 2. It is possible to confirm the compatibility of the solder 11 with the solder 11. Therefore, the inner surface of the cap 4 at the keyway 10 and the end of the valve 2 are well bonded via the solder 11, and the cap 4 can be reliably prevented from rotating.

It goes without saying that the solder 11 can be poured into the keyway 10 and at the same time electrical connection can be made between the base 4 and the external conductor 6 via the solder 11.

Furthermore, since the angle θ formed by the keyway side wall 10b with respect to the tangent x of the valve 2 at the keyway opening 10a is set in the range of 90° to 130°, even when a torsional force is applied to the cap 4, Deformation of the cap 4 and cracking of the valve 2 can be prevented. In other words, when the above angle θ becomes 130° or more, as a result of an experiment with the torsional strength set to 50 kg cm (JIS standard),
The solder 11 attached to the cap 4 is deformed and rides on the keyway side wall 10b, and it wedges between the cap 4 and the valve 2 like a wedge, causing slippage, which causes the cap 4 to rotate in the direction of rotation. 10 to 15
%, which impairs the rotation prevention function of the keyway 10. Furthermore, the solder 11 between the cap 4 and the valve 2 bites into the cap 4, causing deformation of the cap 4 or pressure on the valve 2, causing the valve 2 to crack.

Furthermore, if the angle θ is 130° or less, the above problems will disappear; however, if the angle θ becomes small, such as 90° or less, it becomes extremely difficult to form the keyway 10 itself, and the wall thickness The variation and internal distortion of the valve 2 also increase, which tends to cause the valve 2 to crack.

By setting the angle θ in the range of 90° to 130° as described above, it is possible to prevent deformation of the cap 4 and cracking of the valve 2 due to biting of the solder 11, and also facilitate the forming process of the keyway 10. This also prevents the valve 2 from cracking due to this molding process.

This invention is not limited to the high-pressure discharge lamp bulb as shown in the above embodiment, but can be similarly applied to other bulbs such as incandescent light bulbs commonly used for home use.

As detailed above, according to this invention, the angle formed by the keyway side wall of the keyway is set in the range of 90° to 130° with respect to the tangent to the valve at the keyway opening, and Since the end is extended beyond the opening edge of the cap and exposed to the outside, when the cap is screwed into the end of the valve to cover it, the external conductor is reliably positioned in the keyway. It will not fall out of the keyway. This allows the cap to be smoothly screwed into the end of the valve without damaging the external conductor due to the opening edge of the cap. Also,
When cutting the portion of the external conductor protruding from the opening edge of the cap, the external conductor can be cut without creating any scratches or the like on the bulb. Moreover, even if a twisting force is applied to the cap after the solder has flowed into the keyway and the cap is fixed, the cap will not be deformed or the valve will crack due to the solder biting.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, in which Fig. 1 is a partially cutaway front view of the tube, Fig. 2 is a sectional view taken along the line of Fig. 1, and Fig. 3 is a cross-sectional view taken along the line of Fig. 2. FIG. 4 is an enlarged sectional view of the keyway shown in FIG. 3. 1...tube, 2...valve, 4...cap, 4a
...Opening edge of the cap, 5, 6...External conductor, 10...
...Keyway, 10a...Keyway opening, 10b...
Key groove side wall, 11...solder, x...tangent of valve.

Claims (1)

[Scope of utility model registration request] a valve, a thread provided on the outer peripheral surface of the valve end of the valve, a key groove provided along the tube axis direction on the outer peripheral surface of the valve end, and an external conductor led out to the key groove; In the bulb, the cap is screwed into the thread so as to cover the external conductor, and the cap and the conductor are connected by solder filled in the keyway at least near the opening edge of the cap. The angle formed by the keyway side wall of the keyway is set in the range of 90° to 130° with respect to the tangent to the valve at the keyway opening, and the end of the keyway is extended beyond the opening edge of the cap. The external conductive wire is formed to be exposed to the outside, and further includes:
A tube characterized in that the keyway extends to the end.