JPH09259828A - Rare gas electric discharge lamp and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rare gas electric discharge lamp capable of remarkably improving productivity as the result of possibility of mechanization of production process by means of a comparatively simple constitution. SOLUTION: A linear tube-like envelope 1 having a luminous layer 2 on its inside surface and a sheet structural body 3 are provided while in the sheet structural body 3, a pair of band-like outside electrodes 5, 6 having their length approximately equal to the total length of the envelope 1 and made of metallic members are arranged mutually separated from each other on one side surface of the light transmissible sheet 4 whose thickness is set within a range of 20-100μm. By winding the sheet structural body 3 on the outer peripheral surface of the envelope 1 so as to position the outside electrodes 5, 6 between the envelope 1 and the light transmissible sheet 4, the end parts 4a, 4b of the light transmissible sheet 4 are mutually folded on each other to be subjected to ultrasonic welding, thus the productivity is improved and end part of the light transmissible sheet is prevented from its peeling off.

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 a method for manufacturing the same, and more particularly to a rare gas discharge lamp having a pair of strip-shaped external electrodes on an outer peripheral surface of a glass bulb, which is a sheet structure having external electrodes. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a glass bulb outer peripheral surface and an improvement in a mounting method thereof.

[0002]

2. Description of the Related Art A conventional rare gas discharge lamp of this kind is constructed, for example, as shown in FIG. That is, A is an envelope made of, for example, a glass bulb, and a light emitting layer B made of a phosphor such as a rare earth phosphor or a halophosphate phosphor is formed on the inner surface thereof. 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. It is covered and protected by a protective tube E made of a heat-shrinkable resin.

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 facsimiles, image scanners and the like.

[0004]

However, since this rare gas discharge lamp is manufactured as follows, there is a problem that it is difficult to improve mass productivity.

[0005] First, as shown in FIG. 10, external electrodes C and D having an adhesive layer on one surface are provided on the outer peripheral surface of an envelope A.
Are manually attached so as to be separated from each other by a predetermined distance. Next, the terminals F, F made of copper are soldered to the end portions of the external electrodes C, D with solder for connecting aluminum made of a quaternary alloy of lead-tin-silver-antimony, and at the same time, the terminals F, F are connected to the terminals F, F. Solder an external lead-out harness (not shown). The external electrodes C and D can be attached to the envelope A after the terminals F and F are soldered to the external electrodes C and D. Next, the envelope A is dipped in the silicone varnish solution, pulled up, and then dried for, for example, about 1 hour to form a coating film of the silicone varnish on the surfaces of the envelope A and the external electrodes C and D. . After that, as shown in FIG. 9, the envelope A is covered with a protective tube E made of a heat-shrinkable resin, and the protective tube E is covered by 150 to 20.
A rare gas discharge lamp is manufactured by heating to about 0 ° C. to cause thermal contraction and bringing the protective tube E into close contact with the outer peripheral surface of the envelope A.

As described above, the manufacturing process of the rare gas discharge lamp includes:
Although there is a step of attaching the external electrodes C and D to the outer peripheral surface of the envelope A, it is necessary to attach the external electrodes C and D to a curved surface portion of the envelope A in addition to being formed in a strip shape with a thin film. To be
Difficult to mechanize. Therefore, since it is manually attached, the work efficiency is low, and human naval tactics must be adopted to increase productivity.

In addition, a number of manufacturing processes are performed, such as a manual process of attaching the external electrodes C and D, a process of applying and drying a silicone varnish, and a process of installing a protective tube E and a heat shrinking process. There is a problem that it is difficult to increase the mass productivity because of the necessity.

Therefore, it is an object of the present invention to provide a rare gas discharge lamp and a method for manufacturing the rare gas discharge lamp, which enables mechanization of the manufacturing process with a relatively simple structure and can remarkably enhance the productivity.

[0009]

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 arranged apart from each other, and a translucent sheet made of an insulating member wound around the outer peripheral surface of the envelope so as to cover the external electrodes. Equipped with,
While overlapping the ends of the translucent sheet,
A second invention of the present invention is to form an adhesive layer having an adhesive or adhesive function on the surface of the light-transmitting sheet on the side of the envelope, and the light-transmitting light is applied to the overlapped portion. It is characterized in that the sex sheet is wound and adhered to the outer peripheral surface of the envelope so that the end portions are superposed on each other and the superposed portion is welded.

According to a third aspect of the present invention, one of a straight tubular envelope having a light emitting layer on the 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, and the sheet structure is provided on the outer peripheral surface of the envelope, and the sheet and the envelope are translucent. The external electrode is located between the sheet and
And the end portions of the translucent sheet overlap each other,
A fourth aspect of the invention is characterized in that the overlapping portions are welded, and an adhesive layer having an adhesive or adhesive function is formed on the sheet structure, and the sheet structure is formed on the outer peripheral surface of the envelope. A fifth aspect of the present invention is characterized in that the end portions of the light-transmitting sheet are wound and adhered so as to be overlapped with each other, and the overlapping portions are welded together. ~ 1
It is characterized in that it is set in the range of 00 μm.

A sixth aspect of the present invention is a straight tubular envelope having a light emitting layer on its inner surface, a sheet structure wound around the outer peripheral surface of the envelope, and an outer periphery of the sheet structure. A sheet-shaped pair of strips made of a metal member on one surface of a translucent sheet having a length substantially equal to the entire length of the envelope. External electrodes of the sheet structure are separated from each other, and when the sheet structure is wound around the outer peripheral surface of the envelope, the ends of the translucent sheet are overlapped with each other and the overlapped portions are welded together. According to a seventh aspect of the invention,
The protective layer is formed by a protective tube made of a heat-shrinkable resin.

Further, the eighth invention of the present invention is to provide a predetermined sheet structure in which a pair of external electrodes in the form of a metal member are arranged apart from each other on one surface of the translucent sheet. The step of arranging the envelope in the sheet structure, the step of arranging the straight tubular envelope having the light emitting layer on the inner surface thereof in the sheet structure so that the longitudinal direction thereof is along the longitudinal direction of the external electrode, The step of winding the sheet structure around the outer peripheral surface of the envelope by relative movement of the sheet structure, and superimposing the other end on one end of the translucent sheet; and After the structure is wound, the translucent sheet
A ninth aspect of the present invention is characterized in that an adhesive layer having an adhesive or adhesive function is formed on the sheet structure, and the sheet structure is The outer peripheral surface of the envelope is wound and adhered so that the ends of the light-transmitting sheet are superposed on each other, and then the superposed portion is ultrasonically welded continuously or partially along the longitudinal direction. Is characterized by.

[0013]

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, the envelope 1 is formed by sealing the disc-shaped sealing glasses 1a and 1b to the ends of the glass bulbs. Can also. 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.
And a pair of strip-shaped external electrodes 5 and 6 made of a non-translucent metal member adhered to one surface of the translucent sheet 4 with a predetermined gap therebetween. Terminals 51 and 61 integrally formed at the ends of the external electrodes 5 and 6,
It comprises an adhesive layer 9 provided on one surface of the translucent sheet 4 and having an adhesive or adhesive function. The terminals 51 and 61 are formed by members different from the external electrodes 5 and 6, and can be electrically connected by a connecting member such as a solder member, a conductive adhesive, caulking, or welding.

In this sheet structure 3, the translucent sheet 4 is preferably made of polyethylene terephthalate (PET) resin, for example, but if it is excellent in translucency and electric insulation, it is a polyester resin or the like. Other resins can also be used. For the external electrodes 5 and 6, for example, aluminum foil is suitable, but other metal members such as copper, silver, and nickel can be used as long as they have excellent conductivity and are opaque. further,
A silicone adhesive is suitable for the adhesive layer 9, but an acrylic adhesive or the like can also be used. In particular, this adhesive layer 9
The external electrodes 5 and 6 are also formed on the exposed surfaces, but the external electrodes 5 and 6 are formed on only one surface of the translucent sheet 4 in advance.
It is also possible not to form on the exposed surface of 6.

The above-mentioned sheet structure 3 is an outer peripheral surface of the envelope 1.
In addition, the external electrodes 5 and 6 are provided between the envelope 1 and the translucent sheet 4.
Is mounted so as to be located in the
In (8), the other end is attached to one end 4a of the translucent sheet 4.
One end 4b is overlaid and adhered, and then ultrasonic welding,
It is welded by thermocompression bonding. This welded part is superposed
Formed continuously or partially along the longitudinal direction of the mating part
Have been. In this state, the terminals 51 and 61 are
It is designed so that it projects from the end of the translucent sheet 4.
You. Especially when the seat structure 3 is attached to the envelope 1.
Between the ends 5a and 6a of the external electrodes 5 and 6, respectively.
The mouth portion 7 is located between the other ends 5b and 6b of the external electrodes 5 and 6 and
2 openings 8 are formed respectively, and from the light emitting layer 2
Light is mainly emitted from the first opening 7. In addition,
1, opening angle θ of the second opening 7, 8 ₁ , Θ_Two Is θ₁ > Θ
_Two It is desirable to set them in the relationship of, but set the same
You can also.

This rare gas discharge lamp is manufactured, for example, as follows. First, as shown in FIG. 5, the sheet structure 3 is placed in a predetermined position, for example, an assembly stage in a state where the sheet structure 3 is unfolded. Next, the envelope 1 is attached to the light-transmitting sheet 4 of the sheet structure 3.
The longitudinal direction of the envelope 1 is positioned at one end 4a of the (1) such that the longitudinal direction of the envelope 1 is parallel to the longitudinal direction of the external electrodes 5 and 6. 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. Next, the overlapping portion is welded by bringing the tip portion of the horn of the ultrasonic welding device having a frequency of, for example, 40 KHz into contact with the overlapping portion of the translucent sheet 4 while slightly pressing it.
Then, by appropriately moving the contact position of the horn along the longitudinal direction, the welding of the overlapping portion is completed.

According to this method, the outer electrodes 5 and 6 can be attached to the outer peripheral surface of the envelope 1 by simply rolling the envelope 1 on the sheet structure 3, and the outer electrode can be attached. Since 5 and 6 are arranged on the translucent sheet 4 at a predetermined interval in advance, it is not necessary to adjust the interval of the external electrodes 5 and 6 to be a predetermined interval when attaching. Even if it is manual work, the work efficiency can be remarkably 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.

A light-transmitting sheet 4 in the sheet structure 3 is also provided.
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.

In addition, when the sheet structure 3 is wound and adhered to the outer peripheral surface of the envelope 1, the end portion 4 of the translucent sheet 4 is provided.
Since a and 4b are overlapped and adhered to each other,
In addition to facilitating the welding operation of the overlapped portion, 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 superposed portion of b is easily peeled off, and not only the welding operation but also the winding operation becomes troublesome. Therefore, it is desirable to set the sheet thickness in the above range.

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. Therefore, even when applied to an OA device such as a facsimile machine and a high voltage is applied during use, it is possible to sufficiently secure not only the space between the external electrodes but also the ground insulation.

Further, the end portions 4a, 4 of the translucent sheet 4 are
Since b is superposed on the second opening 8, the light emission property from the first opening 7 can be enhanced.

FIG. 6 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 document reading accuracy 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. 7 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, and this portion is ultrasonically welded.
The superposed / welded portion may be on the outer surface side of the external electrode 6.

According to this embodiment, since ultrasonic welding is performed on the outer surface side of the outer electrode 5, ultrasonic vibration acting on the light emitting layer 2 on the inner surface of the envelope is alleviated. Therefore,
As compared with the first and second embodiments, peeling of the light emitting layer 2 from the inner surface of the envelope can be significantly suppressed, and the light output can be improved.

FIG. 8 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 a light-transmitting property. 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 a pair of external electrodes 5 and 6 are attached to the outer peripheral surface of the envelope 1, the transparent sheet 4 is coated on the outer peripheral surface of the envelope 1 with the external electrodes 5 and 6. The end portions 4a and 4b of the translucent sheet 4 are superposed and ultrasonically welded while being wound and closely attached as described above. The welding can also be performed by thermocompression bonding.

According to this embodiment, compared with the above-mentioned respective embodiments, the mechanization and work efficiency are inferior, but it 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. .

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 overlapping portions of the translucent sheet can be welded by ultrasonic welding, thermocompression bonding, or high frequency welding.

[0034]

As described above, according to the present invention, the outer electrode can be attached to the outer peripheral surface of the envelope by simply rolling the envelope on the sheet structure. The electrodes are translucent
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.

If an adhesive layer is formed on one surface of the light-transmitting sheet of the sheet structure, the envelope can be rolled by simply moving the sheet on the sheet structure. The structure can be wound around the outer peripheral surface of the envelope. 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 is wound around the outer peripheral surface of the envelope, the ends of the translucent sheet are overlapped and welded to each other, so that the translucent sheet is welded. Is not peeled off, and the coating reliability of the external electrode can be improved. In particular, if the thickness of the translucent sheet is set in the range of 20 to 100 μm, peeling off of the overlapping portions of the end portions can be reliably prevented, so that not only the welding work is facilitated, but also desirable insulation is achieved. Sex is obtained.

Further, since the external electrodes are arranged so as to be located between the translucent sheet and the outer peripheral surface of the envelope when the sheet structure is mounted on the envelope. Even when applied to an OA device such as a facsimile machine and a high voltage is applied during use, not only between external electrodes but also between ground electrodes can be sufficiently secured.

[Brief description of drawings]

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

FIG. 2 is a side view of the partially broken state of FIG. 1;

FIG. 3 is a development view of a sheet structure according to the present invention.

FIG. 4 is a sectional view taken along line XX of FIG. 3;

FIG. 5 is a vertical cross-sectional view for explaining the method of the present invention.

FIG. 6 is a vertical sectional view showing a second embodiment of the present invention.

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

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

FIG. 9 is a longitudinal sectional view of a conventional example.

FIG. 10 is a perspective view for explaining a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 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 7 First opening part 8 Second opening part 9 Adhesive layer 10 Protective tube

Claims (9)

[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. ,
The outer peripheral surface of the envelope is provided with a translucent sheet made of an insulating member wound so as to cover the external electrodes, and the end portions of the translucent sheet are overlapped with each other, A rare gas discharge lamp characterized in that the overlapping portions are welded. 2. An adhesive layer having an adhesive or adhesive function is formed on the surface of the light-transmitting sheet on the side of the envelope, and the light-transmitting sheet is attached to the outer peripheral surface of the envelope at the end. 2. The rare gas discharge lamp according to claim 1, wherein the parts are wound and adhered so that the parts are superposed on each other, and the superposed parts are welded. 3. A straight tubular envelope having a light-emitting layer on the inner surface, and 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, wherein the sheet structure is provided on an outer peripheral surface of the envelope, and the envelope and the translucent sheet are provided.
A rare gas discharge lamp characterized in that an external electrode is located between it and the end of the translucent sheet, and the overlapping portions are welded together. 4. An adhesive layer having an adhesive or adhesive function is formed on the sheet structure, and the sheet structure is laminated on the outer peripheral surface of the envelope with the ends of the translucent sheet. 4. The rare gas discharge lamp according to claim 3, wherein the overlapping portion is welded while being wound and adhered as described above. 5. The thickness of the translucent sheet is 20 to 100.
The range of μm is set, and the range is 1 or 3.
A rare gas discharge lamp as described. 6. A straight tubular envelope having a light emitting layer on its inner surface, a sheet structure wound around the outer peripheral surface of the envelope, and a protective layer covering the outer peripheral surface of the sheet structure. The sheet structure is such that a pair of strip-shaped external electrodes made of a metal member are spaced apart from each other on one surface of a translucent sheet having a length substantially equal to the entire length of the envelope. A rare gas discharge lamp characterized in that the end portions of the translucent sheet are overlapped with each other and the overlapped portions are welded in a state where the sheet structure is wound around the outer peripheral surface of the envelope. . 7. The rare gas discharge lamp according to claim 6, wherein the protective layer is formed of a protective tube made of a heat-shrinkable resin. 8. A step of locating a sheet structure, in which a pair of strip-shaped external electrodes made of a metal member are spaced apart from each other on one surface of a light-transmitting sheet, at a predetermined portion, and an inner surface. The step of arranging the straight tubular envelope having the light emitting layer in the sheet structure so that its longitudinal direction is along the longitudinal direction of the external electrode, and the relative movement of the envelope or the sheet structure. , A step of winding the sheet structure around the outer peripheral surface of the envelope, and superimposing the other end on one end of the translucent sheet, and after the sheet structure is wound, the translucency And a step of welding the overlapping portions of the end portions of the sheet, the method for manufacturing a rare gas discharge lamp. 9. An adhesive layer having an adhesive or adhering function is formed on the sheet structure, and the sheet structure is laminated on the outer peripheral surface of the envelope so that the ends of the translucent sheet are superposed on each other. 9. The method for producing a rare gas discharge lamp according to claim 8, wherein the overlapped portion is ultrasonically welded continuously or partially along the longitudinal direction after being wound and adhered as described above.