JPH09259825A - Rare gas electric discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rare gas electric discharge lamp capable of effectively restricting corrosion caused by contact between different kinds of metal together with improvement in productivity in addition to the capability of reducing the dispersion in the configuration of the final product by means of a comparatively simple constitution. SOLUTION: The present electrically discharging lamp is provided with a linear tube-like envelope 1 having a luminous layer 2 on its inside surface and a sheet structural body 3 in which a pair of band-like outside electrodes 5, 6 made of metallic member are arranged mutually separately on one side surface of a light transmissible sheet 4 having its length approximately equal to the total length of the envelope, and terminals 51, 61 having electric relationship of connection to the outside electrode are led out from the terminal part of the outside electrode. And as well as folding to stack the outside electrodes 5, 6 and the terminals 51, 61 of the sheet structural body 3 together, placing the folded to stack part in connection by ultrasonic welding (52, 56). By winding the seat structural body around the outer peripheral surface of the envelope so that the outside electrodes may be positioned between the envelope and the light transmissible sheet, dispersion of configuration and generation of corrosion on account of contact between different kinds of metal can be restricted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rare gas discharge lamp, and more particularly, to a rare gas discharge lamp having a pair of strip-shaped external electrodes on the outer peripheral surface of a glass bulb, and an improvement in a lead-out structure of a terminal from an end of the external electrode. About.

[0002]

2. Description of the Related Art A conventional rare gas discharge lamp of this kind is constructed as shown in FIGS. That is, A is a straight tubular envelope made of, for example, a glass bulb,
On its inner surface, a light emitting layer B made of a phosphor such as a rare earth phosphor or a halophosphate phosphor is formed. A predetermined amount of a rare gas mainly containing xenon gas or the like that does not contain metal vapor such as mercury is sealed in the inner space of the envelope A. On the other hand, a pair of band-shaped external electrodes C and D made of a light-impermeable metal member such as aluminum are attached to the outer peripheral surface of the envelope A so as to face each other. Protective tube E made of heat-shrinkable resin
Covered and protected by Terminals F, F made of, for example, copper are soldered to ends of the external electrodes C, D with solders G for aluminum connection (hereinafter referred to as aluminum solder).

In this rare gas discharge lamp, discharge of xenon gas is generated by applying a high-frequency high voltage (for example, 2500 Vo-p at 25 KHz) to the external electrodes C and D, and the light-emitting layer B is excited by the xenon gas excitation line. The light is emitted from the opening P between the ends Ca and Da of the external electrodes C and D. In particular, since no mercury is used in this rare gas discharge lamp, the rise of the light quantity after lighting is steep, and the light quantity is about 10 at the same time as lighting.
It has the characteristic of reaching nearly 0%. For this reason, it has recently been spotlighted as a light source for reading originals in OA equipment such as facsimiles, image scanners, and copying machines.

[0004]

However, since this rare gas discharge lamp is manufactured as follows, there are problems that it is difficult to stabilize the form of the final product and to improve the mass productivity.

[0007] First, as shown in FIG. 11, external electrodes C and D made of aluminum foil having an adhesive layer on one surface on the outer peripheral surface of an envelope A are separated from each other by a predetermined distance. , Attached by hand. Next, terminals F, F made of copper were connected to the ends of the external electrodes C, D by aluminum solder G,
At the same time as soldering at G, an external lead harness (not shown) is soldered to the terminals F and F. The external electrodes C,
D can be attached to the envelope A after the terminals F, F are soldered thereto. Next, the envelope A is immersed in a silicone varnish solution, pulled up, and dried, for example, for about one hour. As a result, a silicone varnish coating is formed on the surfaces of the envelope A and the external electrodes C and D. Thereafter, the envelope A is covered with a protective tube E made of a heat-shrinkable resin, and the protective tube E is heated to about 150 to 200 ° C. to be thermally contracted. The rare gas discharge lamp shown in FIG. 10 is manufactured by bringing the protective tube E into close contact with the outer peripheral surface.

As described above, the manufacturing process of the rare gas discharge lamp includes:
Terminals F, F are connected to the ends of the external electrodes C, D by aluminum solder G, G
However, since the width of the terminals F and F with respect to the external electrodes C and D is large and the soldering area is large, the soldering is performed manually, so that there is a large variation between workers. There is a tendency that the swelling form of G, G is not constant. For example, if the aluminum solders G, G rise greatly, the area of the terminals F, F is large, so that the external electrodes C of the terminals F, F in a state where the protection tube E is mounted as shown in FIG. , D is locally larger than the outer diameter of the central portion of the envelope A.

Recently, OA equipment such as a facsimile, an image scanner, and a copying machine has been downsized in accordance with a request from a user or the like, and has been used as a light source for reading an original incorporated therein. There is also a demand for miniaturization of the rare gas discharge lamps. Therefore, the clearance between the rare gas discharge lamp and the OA equipment at the installation part is extremely small.

For this reason, there is no problem if the variation in the outer diameter of the rare gas discharge lamp is small over the entire length, but if the outer diameter of the rare gas discharge lamp locally increases as described above, the OA There is a problem that the device cannot be installed at a predetermined position of the device.

Further, in this rare gas discharge lamp, from the viewpoints of the adhesion of the external electrodes C and D to the envelope A, the sticking property and the connection strength of the terminals F and F to the external electrodes C and D, etc. Aluminum having a small thickness is used for the external electrodes C and D, and strip-shaped copper having a width exceeding 50% of the width of the external electrodes C and D is used for the terminals F and F. However, since the corrosion potential trains of these metal members are far apart from each other, a long-term use causes the two contact portions to undergo dissimilar metal contact corrosion. In particular, this rare gas discharge lamp, in use,
Since a high frequency high voltage is applied to the external electrodes C and D thereof through the terminals F and F, corrosion of dissimilar metal contacts is accelerated,
Finally, there is a problem in that the electrical connection between the terminals F, F and the external electrodes C, D is broken, and it becomes impossible to maintain lighting of the rare gas discharge lamp.

On the other hand, in the manufacture of this rare gas discharge lamp, for example, a step of manually attaching the external electrodes C and D, a step of applying and drying a silicone varnish, a step of attaching a protective tube E and a step of heat shrinkage. There is also a problem that it is difficult to improve the mass productivity, because it has to go through a number of manufacturing steps as in the above.

Therefore, an object of the present invention is to provide a rare gas discharge lamp which not only can reduce the variation in the form of the final product with a simple structure, but also can improve the productivity and suppress the contact corrosion of dissimilar metals. It is in.

[0012]

SUMMARY OF THE INVENTION Therefore, in order to achieve the above-mentioned object, the present invention provides a straight tube-shaped envelope having a light emitting layer on the inner surface thereof, and an outer peripheral surface of the envelope having substantially the entire length thereof. A pair of strip-shaped external electrodes made of a metal member that are spaced apart from each other, a terminal that has an electrical connection with the external electrodes, and that is derived from the end of the external electrode, and an outer peripheral surface of the envelope. A transparent insulating member mounted so that the external electrode is covered, the external electrode and the terminal are superposed, and the superposed portion is connected by ultrasonic welding,
According to a second aspect of the present invention, the translucent insulating member is formed of a protective tube made of a translucent sheet or a heat-shrinkable resin.

According to a third aspect of the present invention, one of a straight tubular envelope having a light emitting layer on its inner surface and a translucent sheet having a length substantially equal to the entire length of the envelope. And a sheet structure in which a pair of strip-shaped external electrodes made of a metal member are spaced apart from each other on the surface of the sheet, and terminals having electrical connection with the external electrodes are led out from the ends of the external electrodes. The external electrodes and terminals of the sheet structure are superposed on each other, and the superposed portions are connected by ultrasonic welding, and the sheet structure is attached to the outer peripheral surface of the envelope, and the envelope and the light are transmitted. It is characterized in that it is wound so that the external electrode is positioned between the sex sheet and the sex sheet.

Further, according to a fourth aspect of the present invention, the external electrode and the terminal are formed of a metal member at a position away from the corrosion potential row, and the width W of the external electrode and the width d of the terminal are different. The relationship is set to 0.1 W ≦ d ≦ 0.5 W, and the fifth invention is characterized in that the external electrode is made of aluminum and the terminal is made of copper.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the present invention will be described with reference to FIGS. In the figure, 1
Is a straight tubular envelope that is hermetically sealed by a glass bulb, for example, and has a light emitting layer 2 made of a phosphor such as a rare earth phosphor or a halophosphate phosphor formed on the inner surface thereof. In particular, although the sealing structure of the envelope 1 is configured by sealing the disk-shaped sealing glass plates 1a and 1b to the end of the glass bulb, for example, the diameter is reduced while simply heating the glass bulb. It can also be configured by fusing. In the enclosed space of the envelope 1, a rare gas such as xenon (Xe), krypton (Kr), neon (Ne), or helium (He) which does not contain metal vapor such as mercury is used alone or mixed. However, it is preferable to fill a rare gas containing xenon as a main component at a pressure of, for example, 20 to 110 Torr.

A sheet structure 3 is wound around the outer peripheral surface of the envelope 1 so as to be in close contact therewith. This sheet structure 3
For example, a light-transmitting sheath having a length substantially equal to the entire length of the envelope 1 and a thickness set in a range of 20 to 100 μm.
A pair of band-shaped external electrodes 5 and 6 made of a non-translucent metal member that is attached to one surface of the translucent sheet 4 at a predetermined distance and adhered thereto; Terminals 51 and 61 extending from the ends of the external electrodes 5 and 6 so as to be electrically connected thereto and protrude from the edge portions of the light-transmitting sheet 4; And a bonding layer 9 having a sticking or bonding function provided on one surface of the substrate 4. In particular, the terminals 51 and 61 and the external electrodes 5 and 6
Is electrically connected to each other by superimposing them and performing ultrasonic welding (52, 62) on the superimposed portion.

In the sheet structure 3, the light-transmitting sheet 4 is, for example, polyethylene terephthalate (PE).
T) A resin is preferable, but a polyester resin, a fluorine resin (Teflon: registered trademark) and the like can also be used. A silicone adhesive is suitable for the adhesive layer 9, but an acrylic adhesive or the like can also be used. In particular, the adhesive layer 9 is also formed on the exposed surfaces of the external electrodes 5 and 6, but the translucent sheet is previously formed.
It is also possible to form it on only one surface of the grate 4 and not to form it on the exposed surface of the external electrodes 5, 6.

The external electrodes 5 and 6 and the terminals 51 and 61
Is formed of a metal member at a position away from the corrosion potential train. For example, strip-shaped aluminum foil is suitable for the external electrodes 5 and 6, and strip-shaped copper is suitable for the terminals 51 and 61. However, as the external electrodes 5 and 6, a metal member such as nickel can be used in addition to aluminum as long as the metal member has excellent conductivity and is opaque.
Silver, stainless steel, Cu-N
Metal members such as i-alloys can also be used. In particular, the width W of the external electrodes 5 and 6 and the width d of the terminals 51 and 61 are 0.1W ≦
d ≦ 0.5W. Terminal 5
The wall thickness of 1,61 is preferably in the range of 0.1 to 0.5 mm.

The above-mentioned sheet structure 3 is mounted on the outer peripheral surface of the envelope 1 so that the external electrodes 5 and 6 are located between the envelope 1 and the translucent sheet 4. In a second opening (8) to be described later, one end 4a of the translucent sheet 4 and another end 4b are overlapped and bonded. In particular, when the sheet structure 3 is attached to the envelope 1, the first opening 7 is provided between the one ends 5a and 6a of the external electrodes 5 and 6.
However, second openings 8 are formed between the other ends 5 b and 6 b of the external electrodes 5 and 6, and light from the light emitting layer 2 is mainly emitted from the first openings 7. It is desirable that the opening angles θ ₁ and θ ₂ of the first and second openings 7 and 8 are set to satisfy the relationship of θ ₁ > θ ₂ , but they may be set to the same value.

The rare gas discharge lamp is manufactured, for example, as follows. First, as shown in FIG. 4, the terminals 51 and 61 are superimposed on the ends of the external electrodes 5 and 6, and the horn tip of the ultrasonic welding apparatus whose frequency is set to, for example, 40 KHz is superposed on the superimposed portion. They are brought into contact with each other so as to be pressed and welded (52, 62). Thereby, both are electrically connected. The external electrodes 5 and 6 are arranged on one surface of the translucent sheet 4. Next, as shown in FIG. 6, the sheet structure 3
Is placed in a predetermined position, for example, an assembly stage. Next, the envelope 1 is connected to the translucent sheet of the sheet structure 3.
The longitudinal direction of the envelope 1 is connected to one end 4a of the
6 along the longitudinal direction (so as to be parallel). In this state, the envelope 1 is rolled in the direction indicated by the arrow (the direction of the other end 4b of the translucent sheet 4) by slightly pressing the envelope 1 against the translucent sheet 4. As a result, the sheet structure 3 is wound around the outer peripheral surface of the envelope 1 as shown in FIG. 1, and the other end 4b is superimposed on one end 4a of the translucent sheet 4 and adhered. Glued by layer 9.

According to the rare gas discharge lamp, the terminals 51, 6
Numeral 1 is directly superposed on the ends of the external electrodes 5 and 6, and the superposed portions are connected by ultrasonic welding (52, 62). Can be greatly reduced compared to. For this,
In a state in which the sheet structure 3 is wound and closely attached to the outer peripheral surface of the envelope 1, the outer diameter of the rare gas discharge lamp is substantially equalized over the entire length, and the outer diameter is locally reduced at the end of the envelope. The diameter does not increase. Therefore, in the OA equipment, even if the installation space of the rare gas discharge lamp is considerably restricted, it can be incorporated reliably.

In particular, the width W of the external electrodes 5 and 6 and the terminals 51 and
Since the relation between the width d of the external electrode 61 and the width d of the external electrode 5 is set to 0.1 W ≦ d ≦ 0.5 W, the external electrodes 5, 6 and the terminals 51, 61
Even if ultrasonic welding is performed by directly superposing the above, the occurrence of dissimilar metal contact corrosion can be effectively suppressed. Therefore, a stable operation state can be maintained for a long period of time. However, when the width d of the terminals 51 and 61 is less than 0.1 W, the contact area between the external electrodes 5 and 6 and the terminals 51 and 61 is reduced, the connection strength is reduced, and the assemblability is impaired. Conversely, if the width d exceeds 0.5 W, in order to make the terminals 51 and 61 easily follow the outer peripheral surface of the envelope 1 when the sheet structure 3 is wound around the envelope 1. In addition, it is necessary to previously process the outer surface of the envelope 1 into a curved surface, which not only makes the processing extremely troublesome, but also lowers the reliability of ultrasonic welding. Therefore, it is desirable that both are set in the above-described relationship.

On the other hand, according to the above-mentioned method, the outer electrode 1 is simply rolled on the sheet structure 3, and the outer electrodes 5,
6 can be attached to the outer peripheral surface of the envelope 1, and the external electrodes 5, 6
Are arranged at predetermined intervals on the translucent sheet 4 in advance, so that there is no need to adjust the intervals between the external electrodes 5 and 6 to be the predetermined intervals at the time of sticking. Even for work, work efficiency can be significantly improved. Specifically, while the conventional method required 60 minutes for production, the method of the present invention can reduce the time to about 1 minute.

Further, the light-transmitting sheet 4 in the sheet structure 3
Since the adhesive layer 9 is formed on one surface of the sheet structure 3, the sheet structure 3 is moved by the simple operation of rolling the envelope 1 on the sheet structure 3. Can be wound around and adhered to the outer peripheral surface of the. Therefore, not only the work efficiency can be dramatically improved, but also mechanization becomes possible, and a further mass production effect can be expected.

Moreover, when the sheet structure 3 is wound around and adhered to the outer peripheral surface of the envelope 1, the end portion 4 of the translucent sheet 4 is covered.
Since a and 4b are overlapped and adhered to each other,
The coating reliability of the external electrodes 5 and 6 can be improved. In particular, when the thickness of the translucent sheet 4 is set in the range of 20 to 100 μm, stable polymerization and adhesion of the end portions 4a and 4b can be obtained. However, if the thickness is less than 20 μm, sufficient insulation cannot be ensured.
If it exceeds μm, the stiffness of the sheet becomes strong and the ends 4a, 4
The superimposed portion of b becomes easy to peel off, and the winding operation becomes troublesome. Therefore, it is desirable to set the sheet thickness in the above range.

Further, the external electrodes 5 and 6 are located between the translucent sheet 4 and the outer peripheral surface of the envelope 1 when the sheet structure 3 is mounted on the envelope 1. Due to such consideration, even when applied to an OA device such as a facsimile machine and a high voltage is applied at the time of use, not only the external electrodes but also the ground insulation can be sufficiently secured.

FIG. 7 shows a second embodiment of the present invention, and the basic construction is the same as that of the rare gas discharge lamp shown in FIG. A different point is that an aperture portion (light emitting portion) 2a in which the light emitting layer 2 is not formed is formed on the inner surface portion of the envelope 1 corresponding to the first opening 7. The aperture angle of the aperture portion 2a is set in the range of, for example, 70 to 110 degrees, but it can be appropriately changed depending on the use, purpose and the like.

According to this embodiment, the light emitted from the light emitting layer 2 is densified in the envelope and is emitted to the outside from the aperture 2a through the first opening 7. When applied to the document irradiation device, the illuminance on the document surface can be increased and the reading accuracy of the document can be improved.

In particular, if the surfaces of the external electrodes 5 and 6 on the side of the envelope are provided with light reflectivity, the illuminance of the aperture portion 2a can be further increased and the reading accuracy of the original can be further improved. As a material for this, a metal member having light reflectivity such as aluminum foil is suitable.

FIG. 8 shows a third embodiment of the present invention, and the basic construction is the same as that of the rare gas discharge lamp shown in FIG. The difference is that when the sheet structure 3 is wound around and adhered to the envelope 1, the main overlapping portions of the respective end portions 4a and 4b of the translucent sheet 4 are placed on the outer surface side of the external electrode 5. Is set to. It should be noted that this overlapping portion may be on the outer surface side of the external electrode 6.

FIG. 9 shows a fourth embodiment of the present invention, and the basic construction is the same as that of the rare gas discharge lamp shown in FIG. The difference is that the outer peripheral surface of the sheet structure 3 is covered with a protective tube 10 made of a heat-shrinkable resin.
After the protective tube 10 is mounted on the envelope 1, the tube is heated to, for example, about 150 to 200 ° C. and shrunk to be closely attached to the sheet structure 3.

According to this embodiment, when the environment where the rare gas discharge lamp is applied is harsh environmental conditions or safety standards are high, for example, a protective tube having excellent heat resistance and light transmission properties. By coating the sheet structure 3 with the bump 10, a higher quality product can be provided.

In particular, the structure of this embodiment can be applied to the second and third embodiments shown in FIGS.

A fifth embodiment of the present invention will be described with reference to the second and third embodiments shown in FIGS. In this embodiment, after the external electrodes 5 and 6 whose terminals are ultrasonically welded to the outer peripheral surface of the envelope 1, the translucent sheet 4 is attached to the outer peripheral surface of the envelope 1. The outer electrodes 5 and 6 are wound and adhered so as to be covered, and the respective end portions 4a and 4b of the translucent sheet 4 are overlapped and adhered.

According to this embodiment, compared with the above-mentioned respective embodiments, it is inferior in terms of mechanization and work efficiency, but can be improved as compared with the conventional example. In particular, if an insulating film such as a silicone varnish is formed on the outer peripheral surface of the envelope 1 before winding the translucent sheet 4, the insulating property can be further improved. .

Incidentally, the present invention is not limited to the above-mentioned embodiment at all, and for example, when the sheet structure is attached to the outer peripheral surface of the envelope, the envelope is placed on the sheet structure. In addition to rolling, the sheet structure can be rotated and attached, or the respective operations can be combined. In addition, the envelope is
In the case of rolling on the seat structure, the sheet structure can be positioned at a portion other than the end portion of the sheet structure, for example, the central portion, and can be rolled back and forth to be attached. Also, the respective ends of the sheet structure can be superposed at the first opening. further,
The respective end portions of the sheet structure may be overlapped with each other, but may be abutted with each other or may be treated so as to form a slight gap.

[0037]

Next, an experimental example will be described. Outer diameter is 8m
Figure 4 shows an enclosure made of lead glass with a length of m and a length of 300 mm.
The sheet structure shown in is wound and adhered. The outer electrodes of this sheet structure are made of band-shaped aluminum having a thickness of 70 μm and a width W of 8 mm, and the terminals have a thickness of 0.2 m.
Strip-shaped copper having an m and a width d of 1.5 mm is used, and both are superposed by ultrasonic welding. When this rare gas discharge lamp was placed in an atmosphere having an ambient temperature of 60 ° C. and a relative humidity of 90%, an acceleration test was conducted by applying a high frequency high voltage of 2000 Vo-p of 25 KHz and 2000 Vo-p to the external electrodes. After 1500 hours, no corrosion was observed at the joint between the external electrode and the terminal. However, in the conventional product having the same configuration as the product of the present invention except that the width d of the terminal was set to 4.5 mm and the external electrode and the terminal were connected by aluminum solder, corrosion started to progress after 700 hours had passed. It was recognized that

This is because in the product of the present invention, the width d of the copper terminal having a high corrosion potential is substantially 0.19, which is sufficiently narrower than the width W of the aluminum external electrode having a low corrosion potential. It is speculated that the progress of corrosion was suppressed.
However, in the case of the conventional product, 0.56, and since the progress of corrosion was observed in this state, the relationship between the width d of the terminal and the width W of the external electrode was set to d = 0.1W to 0.5W. Is desirable.

Further, in the product of the present invention, the variation of the outer diameter (maximum value-minimum value) was 0.5 mm over the entire length of the envelope, whereas in the conventional product, the variation was 2.6 mm. It was For this reason, the product of the present invention did not cause any trouble in assembling into a miniaturized OA device, but the conventional product caused trouble in assembling.

[0040]

As described above, according to the present invention, the terminal is directly superposed on the end portion of the external electrode, and the superposed portion is connected by ultrasonic welding. The thickness can be significantly reduced as compared with the conventional example shown in FIG. For this reason, the outer diameter of the rare gas discharge lamp is substantially equalized over the entire length in a state in which the sheet structure is wound around and closely attached to the outer peripheral surface of the envelope, and is locally localized at the end of the envelope. The outer diameter does not become extremely large. Therefore, in the OA equipment, even if the installation space of the rare gas discharge lamp is considerably restricted, it can be incorporated reliably.

Particularly, if the relationship between the width W of the external electrode and the width d of the terminal is set to 0.1 W ≦ d ≦ 0.5 W, the external electrode and the terminal are directly superposed and ultrasonically welded. Also,
The occurrence of corrosion of dissimilar metals can be effectively suppressed. Therefore, a stable operation state can be maintained for a long period of time.

When the sheet structure is used, the outer electrode can be attached to the outer peripheral surface of the envelope by simply rolling the envelope on the sheet structure. Is a translucent sheet
Since it is arranged in advance at a predetermined interval, there is no need to adjust the interval of the external electrodes so that it becomes a predetermined interval at the time of sticking, and even if it is manual work, the work efficiency is significantly improved. it can.

Further, a light-transmitting sheet in the sheet structure is used.
If the adhesive layer is formed on one surface of the sheet, the sheet structure can be wound around and adhered to the outer peripheral surface of the envelope by a simple operation of rolling the envelope on the sheet structure. You can
Therefore, not only the work efficiency can be dramatically improved, but also mechanization becomes possible, and a further mass production effect can be expected.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a side view of the partially broken state of FIG. 1;

FIG. 4 is a development view of a sheet structure according to the present invention.

FIG. 5 is a sectional view taken along line YY of FIG. 4;

FIG. 6 is a longitudinal sectional view for explaining the method of the present invention.

FIG. 7 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 8 is a longitudinal sectional view showing a third embodiment of the present invention.

FIG. 9 is a longitudinal sectional view showing a fourth embodiment of the present invention.

FIG. 10 is a longitudinal sectional view of a conventional example.

FIG. 11 is a perspective view for explaining a conventional method.

FIG. 12 is a sectional view taken along the line ZZ of FIG. 10;

[Explanation of symbols]

 W Width of external electrode d Width of terminal 1 Envelope 2 Light emitting layer 2a Aperture part 3 Sheet structure 4 Translucent sheet 4a, 4b End part 5,6 External electrode 51, 61 Terminal 52, 62 Ultrasonic welding portion 7 First opening portion 8 Second opening portion 9 Adhesive layer 10 Protective tube

Claims (5)

[Claims] 1. A straight tubular envelope having a light-emitting layer on the inner surface, and a pair of strip-shaped external electrodes made of a metal member arranged on the outer peripheral surface of the envelope over substantially the entire length thereof. ,
A terminal having an electrical connection with the external electrode and led out from the end thereof, and a translucent insulating member mounted on the outer peripheral surface of the envelope so as to cover the external electrode. The external electrode and the terminal are superposed on each other, and the superposed portions are connected by ultrasonic welding. 2. The rare gas discharge lamp according to claim 1, wherein said light-transmitting insulating member is formed of a protective tube made of a light-transmitting sheet or a heat-shrinkable resin. 3. A straight tube-shaped envelope having a light emitting layer on its inner surface, and a strip-shaped envelope made of a metal member on one surface of a translucent sheet having a length substantially equal to the entire length of the envelope. A sheet structure in which a pair of external electrodes are arranged apart from each other, and a terminal having an electrical connection with the external electrode is led out from an end of the external electrode; While superimposing the external electrodes and terminals, the superposed portions are connected by ultrasonic welding, and the sheet structure is attached to the outer peripheral surface of the envelope.
A rare gas discharge lamp, which is wound such that an external electrode is located between an envelope and a translucent sheet. 4. The external electrode and the terminal are formed of a metal member at a position away from the corrosion potential line, and the relationship between the width W of the external electrode and the width d of the terminal is 0.1 W ≦ d ≦ 0. .
The rare gas discharge lamp according to claim 1 or 3, wherein the power is set to 5W. 5. The rare gas discharge lamp according to claim 4, wherein the external electrode is made of aluminum and the terminal is made of copper.