JPS6223017Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a high-pressure discharge lamp with a built-in ballast that houses a ballast filament coil together with an arc tube in an outer bulb, and particularly relates to a support structure for the filament coil.

[Conventional technology]

Conventionally, the filament coil in this type of high-pressure discharge lamp with a built-in ballast is arranged so as to surround one end of the arc tube. To support this filament coil, a filament holder made of an insulator such as glass or ceramic is attached to the support wire, and multiple anchor wires are planted in this filament holder. It had come to hold.

However, according to the conventional structure described above, since multiple anchor wires are planted in a filament holder made of an insulator, the number of anchor wires is large, and the anchor wire and filament coil are assembled almost in a cage shape, so the structure is poor. There was a problem that it became complicated and moreover, the amount of light emitted from the arc tube was blocked. In addition, the filament holder has multiple anchor wires planted in it, making it large and heavy, so when vibrations or shocks are applied, the members supporting the filament holder may deform, causing the filament holder to become The filament coil may be misaligned from its installation position, and problems such as the filament coil approaching the arc tube and damaging the arc tube bulb due to the heat generated may also occur.

For this reason, the filament coil is bridged between the support wire and the main electrode of the arc tube, and the intermediate part of the filament coil is
It is conceivable that the arc tube be supported by an anchor wire implanted in the sealed portion of the arc tube.

This eliminates the need for a special large and heavy filament holder, reduces the number of anchor wires required, reduces the number of parts, simplifies the structure, and improves vibration and impact resistance. There are advantages such as expected.

[Problem that the invention attempts to solve]

However, when implanting the anchor wire into the sealed portion of the arc tube, conventionally it has been considered to form the anchor wire as one continuous thin wire. The reason why the anchor wire is a thin wire (wire diameter 0.3 to 0.4 mm) is that the anchor wire is usually made of a hard-to-melt metal such as molybdenum or tungsten, and has good bending workability to be hooked to the middle part of the filament coil. It's to make things better.

However, when such a small-diameter anchor wire is implanted in the sealing part of an arc tube, the small diameter of the wire means that the contact area with the quartz glass is small, and there is a risk that it may easily come out of the sealing part. .

Therefore, the present invention aims to provide a high-pressure discharge lamp with a built-in ballast that uses an anchor wire that does not come out of the sealed portion of the arc tube and is easy to bend for hooking the filament coil. It is.

[Means for solving problems]

The present invention consists of an anchor wire that has a relatively thick embedded wire that is implanted in the sealing part of the arc tube, and a wire that is thinner in diameter than the embedded wire and that has one end joined to the embedded wire and a filament at the other end. It is characterized by comprising a support wire that supports the intermediate portion of the coil.

[Effect]

According to this invention, the embedded wire can have a large diameter, so it is firmly connected to the sealing part of the arc tube, so it will not come off, and the support wire has a small diameter, so it cannot be bent. It is easy to process, and the filament coil can be hooked and supported reliably.

〔Example〕

An embodiment of this invention will be described below with reference to FIGS. 1 and 2.

The drawing shows a 100V250W high-pressure mercury lamp, and 1 is the outer tube. This outer tube 1 has a protrusion 2 projecting outward at the top, and a cap 3 at the other end.
This is a so-called BT type valve. A light emitting tube 4 is housed within the outer tube 1 . The arc tube 4 has main electrodes 6a and 6b disposed opposite to each other at both ends of a quartz glass bulb 5.
An auxiliary starting electrode 7 is arranged close to the other main electrode 6b. Both ends of the valve 5 form crushing sealing parts 8a and 8b, and each of these sealing parts 8
Metal foil conductors 9a, 9b connected to the main electrodes 6a, 6b and another metal foil conductor 10 connected to the auxiliary electrode 7 are sealed in a, 8b. External lead wires 11a, 11b and 12 are connected to each of these metal foil conductors 9a, 9b and 10, and led out from each of the sealing portions 8a and 8b.
The sealing parts 8a and 8b are held between holders 13 and 13, and these holders 13 and 1
3 is fixed to the support wire 14. The support wire 14 also serves as a conductive wire, and is bent into a substantially U-shape, for example. The upper ends 15a and 15b of the support wire 14 are in elastic contact with the inner wall surface of the protrusion 2 of the outer tube 1, and the base is connected to the stem 1.
It is welded to the inner conductor 17a sealed in the inner conductor 17a. Another inner conducting wire 17b is sealed in the stem 16, and this inner conducting wire 17b is connected via a conductive wire 18 to a lead wire 11b leading to the other main electrode 6b. Note that the inner conductor 17a of the stem 16
and 17b are connected at one end to the base 3 and at the other end to the eyelet terminal 19. Further, a lead wire 12 connected to the auxiliary electrode 7 is connected to a support wire 14 via an auxiliary resistor 20.

Lead wire 1 connected to the one main electrode 6a
1a is bent outside the sealing portion 8a, and one end leg portion 22a of the ballast filament coil 21 is welded to the tip of this bend. The other end leg portion 22 of the ballast filament coil 21
b is welded to approximately the center of the support wire 14. The filament coil 21 is made of tungsten, for example, and is formed into a double coil with a coil length of about 40 mm. By the way, the diameter of the coil wire is approximately 0.1 mm, and the coil is formed into a double coil from a thin wire with a total length of approximately 120 cm. An intermediate portion of the filament coil 21 is held by an anchor wire. The anchor wire has a two-part structure: a support wire 23 made of a molybdenum wire with a wire diameter of about 0.3 to 0.4 mm, and a buried wire made of a doped molybdenum wire with a diameter similar to that of the external lead wires 11a and 11b. It is composed of a connecting line 24.
The tip of the support wire 23 is a filament coil 21
The base end of the embedded wire 24 is bent to hold the intermediate portion of the valve 5.
It is planted in. The proximal ends of these support wires 23 and the distal ends of the embedded wires 24 are welded together.
Although the embedded wire 24 is implanted in conjunction with the sealing molding operation of the sealing portion 8a, it may be implanted by heating so as to slightly soften the sealing portion 8a after sealing. .

In the lamp of this embodiment having such a configuration, a starting discharge is generated between the auxiliary starting electrode 7 and the main electrode 6b adjacent thereto when the power is connected, and this starting discharge is then transferred to the main electrode 6a. , 6b. In this way, the arc tube 4 is lit. When the arc tube 4 is lit, the ballast filament coil 21 connected in series with the arc tube 4 is also energized. It also emits light.
Therefore, the arc tube 4 and the ballast filament coil 2
1 and 2 emit light at the same time.

In the lamp having the above configuration, one end of the ballast filament coil 21 is welded to the lead wire 11a which is electrically connected to the main electrode 6a, and the other end is welded to the support wire 14. The continuity connection is between the lead wire 11a and the support wire 1.
4 is directly connected. Therefore, a special lead wire or the like is not required for conducting the filament coil 21.

Further, since the intermediate portion of the filament coil 21 is held by the anchor wire, the filament coil 21 is not deformed by vibration or impact, and can be prevented from sagging. In this case, since the anchor wire is implanted in the sealing portion 8a of the arc tube 4, there is no need for a special filament holder like the conventional one to hold the anchor wire. This reduces the number of parts and simplifies the structure. In particular, since a filament holder is not required, there is no deformation due to vibration or impact caused by the large weight of the filament holder, and thus displacement or deformation of the filament coil 21 can be prevented. In the anchor wire, since the embedded wire 24 having a relatively large diameter is implanted in the sealing part 8a of the arc tube 4, the contact area between the embedded wire 24 and the quartz glass of the sealing part 8a is small. Large and twisted sealing part 8a
There's no need to worry about getting out of it. Moreover, this embedded line 24
Since the support wire 23 welded to has a small diameter, it is easy to bend it to support the intermediate portion of the filament coil 21.

In the above embodiment, one anchor wire was used, but one anchor wire was used.
The device is not limited to a book, and two or more books may be used, for example, as shown in a modified example in FIG. In the case of Fig. 3, at least one anchor line is the support line 41.
This embedded wire 42 was embedded in the sealing part 8a of the arc tube 4, and the other anchor wire 43 was fixed to the support wire 14 via an insulator 44 such as a glass bead. It is something.

Further, although the above embodiment has been described in which the auxiliary starting electrode 7 is disposed close to the main electrode 6b, it is also possible to use an auxiliary starting coil in place of the auxiliary electrode 7. That is, although FIG. 4 shows a lamp provided with an auxiliary coil 51, this lamp is provided with a bimetallic switch 52 in the starting circuit.
is installed so as to form a parallel circuit with the arc tube 4, so it is interposed between the auxiliary coil 51 and the lead wire 11a, and the conductive wire 5 is connected to the lead wire 11a.
3.

Furthermore, in each of the embodiments described above, the support wire 14 is approximately U-shaped, but the support wire 14 is not limited to the shape of the embodiments described above, as it has been implemented in various shapes.

Furthermore, this invention is not limited to high-pressure mercury lamps, but can also be applied to metal halide lamps and the like.

[Effect of idea]

As detailed above, according to this invention, one end of the ballast filament coil is connected to one main electrode, and the other end is connected to the support wire,
Since the middle part of this filament coil is held by an anchor wire and this anchor wire is implanted in the sealing part of the arc tube, the number of anchor wires used is reduced, and these anchor wires are attached to the sealing part of the arc tube. Since it is planted, there is no need to use a conventional large filament holder, which simplifies the structure and improves vibration resistance and impact resistance.
Furthermore, the anchor wire joins the embedded wire that is implanted in the sealed portion of the arc tube and the support wire that holds the intermediate portion of the filament coil, and the embedded wire has a relatively large diameter so that it can be sealed. firmly fixed to the
There is no need to worry about it slipping out, and since the support wire has a relatively small diameter, bending is easy and the filament coil can be held securely.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of this invention, with Figure 1 being a front view in cross section of the outer bulb of a high-pressure mercury lamp, Figure 2 being a perspective view of the main parts, and Figure 3 being this invention. FIG. 4 is a front view of a mount showing a modification of this invention. FIG. 4 is a front view showing still another embodiment of this invention. 1... Outer tube, 4... Arc tube, 6a, 6b... Main electrode, 8a, 8b... Sealing part, 14... Support wire, 21... Ballast filament coil, 23, 41... Support wire ( anchor line), 2
4, 42...Embedded line (anchor line).

Claims (1)

[Scope of utility model registration request] A ballast filament coil is housed in the outer tube along with the arc tube, one end of the filament coil is connected to the main electrode of the arc tube, the other end is connected to a support wire, and an intermediate portion of the filament coil is connected to the main electrode of the arc tube. In a high pressure discharge lamp supported by an anchor wire implanted in the sealing part, the anchor wire has a diameter smaller than that of the embedded wire implanted in the sealing part of the luminous tube. A high-pressure discharge lamp with a built-in ballast, characterized in that one end is connected to the embedded wire and the other end is a support wire that supports an intermediate portion of the filament coil.