JPH03110754A - Circular electric lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a tube-shaped light bulb used, for example, as a heater or a light source.

(Prior art) High output power (e.g. 1.5~
2. Annular light bulbs (Okw) generally have a structure in which an internal wire, such as a filament coil, is housed in a circular tube made of heat-resistant glass.

However, since such an annular light bulb is arranged with both ends of the tube spaced apart from each other on the annular line, the separated region becomes a portion that does not generate heat. For this reason, when cooking using a frying pan, pot, etc., there is a problem in that temperature unevenness occurs in parts of the frying pan, pot, etc. that correspond to parts that do not generate heat.

Therefore, in order to eliminate temperature unevenness, the present applicant previously filed an application for an annular light bulb in which the entire circumference of an annular line is a heat-generating portion.

FIG. 7 shows the structure of this annular bulb.

To explain this ring-shaped light bulb, reference numeral 1 denotes a ring-shaped bulb (corresponding to a tube) made of a heat-resistant hard member, such as quartz. The ends of the valve 1 are crossed with each other,
The intersecting ends extend to the periphery, and each end is sealed (by crushing) to form an annular shape. Further, inside this bulb 1, a filament coil 3 (each corresponds to an internal wire) consisting of a tungsten coil with internal lead wires 2 of tungsten wire integrally connected to both ends as a leg portion is accommodated along the axial direction. There is. The filament coil 3 is inserted into the annular portion la of the bulb 1, and the internal lead wires 2.2 are inserted into the extension portions 1b and lb of the bulb 1, respectively, so that the entire annular portion of the bulb 1 becomes the heat generating portion 4. There is. The ends of each internal lead wire 2.2 are connected to external lead wires 7 (made of molybdenum wells) via metal foil conductors 6 (made of molybdenum or the like) sealed to sealing parts 5 at both ends of the bulb. (equivalent to an external line). Note that a plurality of anchors 8 are disposed inside the tube 1 and support the filament coil 3 on the axis of the tube.

By the way, the extension part 1b of this ring-shaped light bulb, that is, the straight pipe part after the bulb intersection, is very long, and in addition to the circle diameter,
Variations tend to occur due to the overall length of the filament, etc. That is, when using this annular light bulb, the heat insulating material 9 is attached along the outer periphery of the bulb 1 as shown by the two-dot chain line.
At this time, in order to protect the sealing part 5 from heat and lowering the temperature of the sealing part 5, it is necessary to expose it to the outside of the heat insulating material 9, and the straight pipe portion becomes considerably long.

Therefore, when sealing the valve 1 with a different diameter as described above,
Due to variations in the circle diameter, variations in the overall length of the filament, etc., it is often impossible to set the metal foil conductor 6 in the correct position.

In such a case, hold the external lead wire 7 and connect the valve 1.
It is necessary to push up or pull the internal wire to correct the metal foil conductor 6 to its normal position.

(Problem to be Solved by the Invention) By the way, when adjusting the position of the metal foil conductor 6, the internal lead wire 2 and the filament coil 3 are moved, but the filament coil 3 used in the cooker has a high output (
1,5-2. In addition to the wire diameter being thick in order to produce
Since the anchor 8 contacts the inner surface of the valve 1, the internal wire of the valve 1 cannot move freely.

Therefore, if the internal wire is forcibly pushed up or pulled, there is a problem that the metal foil conductor 6 may be cut, carelessly bent, or wrinkled due to the excessive force.

When this happens, it causes non-lighting or slow leakage, resulting in a shortened lifespan.

This invention was made with attention to these circumstances,
The object is to provide an annular light bulb in which the metal foil conductor can be set in the correct position without applying excessive force.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the tube-shaped light bulb of the present invention includes a tube-shaped light bulb having an inner line extending through the extension portion of the tube at least along the axial direction of the tube. A telescopic part is provided that can be expanded and contracted.

(Function) According to the tube-shaped light bulb of the present invention, in order to correct the misalignment of the metal foil conductor, when the external wire is pushed up or pulled, the expandable portion expands and contracts in accordance with the movement. It becomes possible to align the metal foil conductor by only displacing the parts.

(Example) The present invention will be described below based on a first example shown in FIGS. 1 and 2. However, in the drawing, the above “
The same parts as those described in the section ``Prior Art'' will be given the same reference numerals and their explanations will be omitted, and in this section, different parts (main parts of the invention) will be explained.

This embodiment is different in that the internal lead wire 2 passing through the extension part 1b of the valve 1 is made into a telescopic part 10.

That is, the expandable and retractable portion 10 is formed of a tungsten wire having a larger diameter than the wire diameter of the filament coil 3, for example, and is spirally wound in a large circular arc so as to be loosely wound. That is, the telescopic portion 10 is configured in the shape of a flexible spring that can be freely displaced in the axial and radial directions. In addition, the elastic part 10 uses a tungsten wire with a diameter larger than that of the filament coil 3 to reduce resistance.
This entire part is made into a part that does not generate heat, that is, a non-heat generating part.

The total length of the telescopic portion 10 has a length corresponding to the internal lead wire 2. This telescopic portion 10 is movably disposed inside each extension portion 1b, lb of the valve 1 in place of the internal lead wire 2.

One end of the expandable portion 10 serving as a valve end is connected to the metal foil conductor 6 of the sealing portion 5. Moreover, the other end is connected to the end of the filament coil 3 via the connection part 11. Specifically, the connecting portion 11 includes, for example, a tightly wound coil portion 12 for reception formed at the end of the filament coil 3 as shown in FIG. A tightly wound coil portion 13 for insertion having a diameter slightly smaller than that of 12 is formed. Then, by inserting the coil portion 13 into the coil portion 12, the coil portion 13 and the coil portion 12 are fixed to each other by inscribing the coil portion 13 into the coil portion 12.

However, when sealing the bulb 1 of the annular light bulb constructed in this way, if the position of the metal foil conductor 6 shifts due to variations in the circle diameter, variations in the overall length of the filament, etc., it is necessary to hold the external lead wire 7. Push it up or pull it out. Then, the extensible portion 10 is displaced in the axial direction, radial direction, etc. according to the movement, allowing the metal foil conductor 6 to move.

However, the metal foil conductor 6 can be aligned simply by displacing the expandable portion 10 without applying excessive force to the metal foil conductor 6.

Therefore, occurrence of cuts, bends, wrinkles, etc. in the metal foil conductor 6 can be prevented, and a high-quality ring-shaped light bulb can be provided.

Further, the present invention is not limited to the first embodiment, but can be applied to the second embodiment shown in FIGS. 3 and 4, and the fifth embodiment shown in FIGS.
The third embodiment shown in FIGS. and FIG. 6 may also be used.

In the second embodiment, the expandable/contractable part 10 is constructed by utilizing, for example, the metal foil conductor 6 on one side of the sealing part 5.5.

That is, the metal foil conductor 6 has a band shape with the end portion on the filament coil side extending toward the extension portion 1b side. The metal foil conductor portion 15 within this extension portion 1b is in a slightly bent state. The end portion of the bent metal foil conductor 6 is connected to the internal lead wire 2, and the bent metal foil conductor portion 15 is used as an expandable portion 10. Note that FIG. 4 shows the area around the internal lead wire 2 and the metal foil conductor portion 15.

Even with such a telescopic portion 10, the metal foil conductor 6 can be set in a normal position without applying excessive force to the metal foil conductor 6, as in the first embodiment. That is, when the telescopic portion 10 is provided on one side, the valve 1 is sealed by first sealing the valve end on the side where the telescopic portion 10 is not provided, and then setting the metal foil conductor 6 in its normal position. After that, the valve end on the side where the expandable part 10 is located is sealed. At this time, if the metal foil conductor 6 is out of position, hold the metal foil conductor 6 and push it up or pull it to the correct position as in the first embodiment.
Just go.

The third embodiment is a modification of the second embodiment, in which a metal foil conductor 20 made of a very thin band-shaped molybdenum foil bent into a bellows shape is inserted into a part of the internal lead wire 2. The telescoping section 10 is provided by Even in this case, the same effects as in the first embodiment described above can be achieved.

However, in the second embodiment and the third embodiment, the same parts as in the first embodiment are given the same reference numerals, and the explanation thereof is omitted.

In addition, in each of the above-mentioned embodiments, the present invention is applied to an annular light bulb used as a heater, but the present invention is not limited to this.
It may also be applied to an annular light bulb used as a light source.

Further, in the above embodiment, an external lead wire is connected to a metal foil conductor, but this is not limited to this.A metal foil conductor made of molybdenum or the like may be extended to the outside of the bulb and used as an external lead wire. This also has the advantage of reducing the number of parts.

[Effects of the Invention] As explained above, according to the present invention, the metal foil conductor can be set in a normal position without applying excessive force.

Therefore, occurrence of cuts, bends, wrinkles, etc. in the metal foil conductor can be prevented, and a high-quality ring-shaped light bulb can be provided.

[Brief explanation of drawings]

FIG. 1 is a front view showing an annular light bulb according to a first embodiment of the present invention, FIG. 2 is a vertical cross-sectional view showing an enlarged structure of the telescoping portion, and FIG. 3 is a second embodiment of the present invention. FIG. 4 is a longitudinal cross-sectional view showing an enlarged structure of the telescoping part, FIG. 5 is a front view of the ring-shaped light bulb according to the third embodiment of the present invention, and FIG. FIG. 7 is a longitudinal cross-sectional view showing an enlarged structure of the telescoping portion, and FIG. 7 is a front view showing a conventional ring-shaped light bulb. 1... Valve (tube) 2... Internal lead (internal wire part), 3... Filament coil, 5... Sealing part, 6... Metal foil conductor, 7... External lead wire (External line), 10... Telescopic part. 1!3wA lI4Figure 1=iS-rupu' (+knee 7") 2-4QO Lee)
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Claims (1)

[Claims] An annular tube is provided whose ends are crossed with each other, the crossed ends are extended, and each end is sealed, an internal wire is disposed within this tube along the axial direction, and In an annular light bulb in which a metal foil conductor connecting the inner wire and the outer wire is sealed to the stop part, the inner wire portion passing through the extension part of the tube has an expandable and retractable part that can be expanded and contracted at least along the axial direction of the tube. A ring-shaped light bulb characterized by having a flexible part.