JP3025191B2 - Rare gas discharge lamp and method of manufacturing the same - Google Patents

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 of manufacturing the same, 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. The present invention relates to an improvement in a mounting structure on a glass bulb outer peripheral surface and 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 occurs when a high frequency high voltage (for example, 2500 Vo-p at 25 KHz) is applied 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 light quantity rises sharply after lighting, and the light quantity is almost 10
It has the characteristic of reaching nearly 0%. For this reason, recently, it has been spotlighted as a light source for reading an original such as a facsimile or an image scanner.

[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, terminals F, F made of copper are soldered to the ends of the external electrodes C, D with solder for aluminum connection made of a quaternary alloy of lead-tin-silver-antimony. An external lead harness (not shown) is soldered. 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 immersed in a silicone varnish solution, pulled up, and then dried, for example, for about one hour to form a silicone varnish film on the surfaces of the envelope A and the external electrodes C and D. . Thereafter, 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 placed in the range of 150 to 20.
A rare gas discharge lamp is manufactured by heating to about 0 ° C. to cause thermal contraction and bringing a 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 steps are performed, such as a step of manually attaching the external electrodes C and D, a step of applying and drying a silicone varnish, and a step of installing a protective tube E-a heat shrinking step. There is a problem that it is difficult to increase the mass productivity because of the necessity.

[0008] Therefore, an object of the present invention is to provide a rare gas discharge lamp and a method of manufacturing the rare gas discharge lamp, in which the manufacturing process can be mechanized with a relatively simple configuration, and productivity can be significantly increased.

[0009]

SUMMARY OF THE INVENTION Accordingly, in order to achieve the above-mentioned object, the present invention provides a straight tubular envelope having a light-emitting layer on the inner surface, and an outer peripheral surface of the envelope substantially over its entire length. A pair of band-shaped external electrodes made of a metal member spaced apart from each other, and a light-transmitting sheet made of an insulating member wound around the outer peripheral surface of the envelope so as to cover the external electrodes. And
The ends of the translucent sheet are along the outer peripheral surface of the envelope.
In the second invention of the present invention, an adhesive layer having an adhesive or adhesive function is formed on the surface of the translucent sheet on the side of the envelope. The translucent sheet is wound and adhered to the outer peripheral surface of the envelope so that the ends are overlapped with each other along the outer peripheral surface, and the overlapped portion is welded.

[0010] A third aspect of the present invention relates to a straight tubular envelope having a light-emitting layer on the inner surface, and 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 band-shaped external electrodes made of a metal member are arranged apart from each other, and the sheet structure is provided on the outer peripheral surface of the envelope, and an external member is provided between the envelope and the light-transmitting sheet. The electrodes are located
And the ends of the translucent sheet are along the outer peripheral surface of the envelope with each other
In the fourth invention, 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. The edges of the translucent sheet are outside of each other.
In the fifth invention, the thickness of the light-transmitting sheet is set in a range of 20 to 100 μm, and the winding and bonding are performed so as to be overlapped along the peripheral surface, and the overlapped portion is welded. It is characterized by the following.

According to a sixth aspect of the present invention, there is provided a straight tubular envelope having a light-emitting layer on the inner surface, a sheet structure wound around the outer surface of the envelope, and an outer peripheral surface of the sheet structure. A protective layer, and the sheet structure is formed by disposing a pair of strip-shaped external electrodes made of a metal member on one surface of a translucent sheet having a length substantially equal to the entire length of the envelope. In a state where the sheet structure is wound around the outer peripheral surface of the envelope, the ends of the translucent sheets are arranged along the outer peripheral surface of the envelope with each other.
In the seventh invention, the protective layer is formed of a protective tube made of a heat-shrinkable resin.

According to an eighth aspect of the present invention, a sheet structure in which a pair of strip-shaped external electrodes made of a metal member are arranged on one surface of a light-transmitting sheet so as to be separated from each other is provided at a predetermined position. And a step of positioning a straight tubular envelope having a light-emitting layer on the inner surface thereof in a sheet structure such that the longitudinal direction thereof is along the longitudinal direction of the external electrode, and the relative movement of the envelope or the sheet structure. Thereby, the sheet structure is wound around the outer peripheral surface of the envelope, and the other end is attached to one end of the translucent sheet.
The ninth invention is characterized in that the ninth invention is characterized in that the ninth invention comprises a step of overlapping the outer peripheral surface of the envelope, and a step of welding the overlapped portion of the end portion of the translucent sheet after winding the sheet structure. Forming an adhesive layer having an adhesive or adhesive function on the sheet structure, winding the sheet structure on the outer peripheral surface of the envelope so that the ends of the translucent sheets are overlapped with each other along the outer peripheral surface . After the bonding, the overlapped portion is continuously or partially ultrasonically welded along the longitudinal direction.

[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.
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, 61 formed integrally with the ends of the external electrodes 5, 6,
An adhesive layer 9 having an adhesive or adhesive function is provided on one surface of the translucent sheet 4. Note that the terminals 51 and 61 are formed of members separate from the external electrodes 5 and 6, and can be electrically connected by connection means such as a solder member, a conductive adhesive, caulking, and welding.

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

The above-mentioned sheet structure 3 has external electrodes 5 and 6 mounted on the outer peripheral surface of the envelope 1 so as to be located between the envelope 1 and the translucent sheet 4. 2, the other end 4b is superposed on and adhered to one end 4a of the translucent sheet 4 along the outer peripheral surface of the envelope 1 , and is then subjected to ultrasonic welding and heat. Welded by crimping. This welded portion is formed continuously or partially along the longitudinal direction of the overlapped portion. In this state, care is taken so that the terminals 51 and 61 protrude from the ends of the translucent sheet 4. In particular, the sheet structure 3
Of the external electrodes 5, 6 between the one ends 5a, 6a of the external electrodes 5, 6, the external electrode 5,
A second opening 8 is formed between the other ends 5 b and 6 b of the light emitting element 6, and light from the light emitting layer 2 is mainly emitted from the first opening 7. The first and second openings 7, 8
It is desirable to set the opening angles θ ₁ and θ ₂ in a relationship of θ ₁ > θ ₂ , but they can be set the same.

The rare gas discharge lamp is manufactured, for example, as follows. First, as shown in FIG. 5, the sheet structure 3 is placed on a predetermined portion, for example, an assembly stage in a state where the sheet structure 3 is expanded. Next, the envelope 1 is connected to the translucent sheet 4 of the sheet structure 3.
Is positioned so that the longitudinal direction of the envelope 1 is along (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 connected to one end 4a of the translucent sheet 4 by the envelope 1
Are superposed along the outer peripheral surface of the substrate and bonded by the adhesive layer 9. Next, the overlapping portion is welded by pressing the tip of the horn of the ultrasonic welding device having a frequency of, for example, 40 KHz so as to slightly press the overlapping portion of the translucent sheet 4. Then, by appropriately moving the contact position of the horn along the longitudinal direction, welding of the overlapped portion is completed.

According to this method, the external electrodes 5 and 6 can be adhered to the outer peripheral surface of the envelope 1 simply by rolling the envelope 1 on the sheet structure 3, and the external electrode Since the electrodes 5 and 6 are arranged on the translucent sheet 4 at a predetermined interval in advance, there is no need to adjust the interval between the external electrodes 5 and 6 to a predetermined interval at the time of sticking. Even if manual work is performed, the 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.

The translucent 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.

In addition, when the sheet structure 3 is wound and adhered to the outer peripheral surface of the envelope 1, the end 4
Since a and 4b are overlapped and adhered to each other along the outer peripheral surface of the envelope 1, not only the welding operation of the overlapped portion is facilitated but also the coating reliability of the external electrodes 5 and 6 is improved. Can also be enhanced. In particular, if the thickness of the translucent sheet 4 is set in the range of 20 to 100 μm, the end portions 4a,
A stable polymerization and adhesion of 4b can be obtained. However, if the thickness is less than 20 [mu] m, to sufficient insulation can not be <br/> secured, it exceeds 100μm Conversely, end 4a to the waist of the sheet becomes stronger, peeling overlapped portion of 4b It becomes easy, and not only welding work but also winding work 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 and a high voltage is applied during use, sufficient insulation between the external electrodes as well as between the external electrodes can be ensured.

Further, the ends 4a, 4a of the translucent sheet 4
Since b is overlapped in the second opening 8, light emission from the first opening 7 can be enhanced.

FIG. 6 shows a second embodiment of the present invention. The basic configuration is the same as that of the rare gas discharge lamp shown in FIG. The difference is that an aperture portion (light emitting portion) 2a in which the light emitting layer 2 is not formed is formed in the inner surface portion of the envelope 1 corresponding to the first opening 7. The aperture angle of the aperture portion 2a is set, for example, in the range of 70 to 110 degrees, but can be changed as appropriate according to the use and purpose.

According to this embodiment, the light radiated from the light emitting layer 2 is densified in the envelope and is emitted from the aperture 2a to the outside through the first opening 7. When applied to a document irradiating 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 envelope side are provided with light reflectivity, the illuminance of the aperture portion 2a can be further increased, and the reading accuracy of the document can be further improved. As such a material, a metal member having light reflectivity such as an aluminum foil is preferable.

FIG. 7 shows a third embodiment of the present invention. The basic structure 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 and adhered to the envelope 1, the main overlapping portions of the ends 4a and 4b of the translucent sheet 4 are connected to the outer surface of the external electrode 5. , And this part was ultrasonically welded.
Note that this overlapped / welded portion may be on the outer surface side of the external electrode 6.

According to this embodiment, since the ultrasonic welding is performed on the outer surface side of the external electrode 5, the ultrasonic vibration acting on the light emitting layer 2 on the inner surface of the envelope is reduced. Therefore,
Compared with the first and second embodiments, the separation of the light emitting layer 2 from the inner surface of the envelope can be greatly suppressed, and the light output can be improved.

FIG. 8 shows a fourth embodiment of the present invention. The basic structure is the same as that of the rare gas discharge lamp shown in FIG. The difference is that a protective tube 10 made of a heat-shrinkable resin is placed on the outer peripheral surface of the sheet structure 3.
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 under severe environmental conditions or high safety standards, for example, a protective tube having excellent heat resistance and translucency is used. By coating the sheet structure 3 with the bush 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 adhered to the outer peripheral surface of the envelope 1, the translucent sheet 4 is coated on the outer peripheral surface of the envelope 1 with the external electrodes 5 and 6. In addition, the ends 4a and 4b of the translucent sheet 4 are superposed and ultrasonically welded together. This welding can be performed by thermocompression bonding.

According to this embodiment, although it is inferior in mechanization and work efficiency as compared with the above-described embodiments, 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 embodiment. 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 each operation can be used together. Also, seal the envelope.
In the case of rolling on the sheet structure, it may be positioned at a portion other than the end of the sheet structure, for example, at the center portion, and rolled back and forth to adhere. Also, each end of the sheet structure can be overlapped at the first opening. further,
Welding of the overlapping portions of the translucent sheets may be performed by ultrasonic welding, thermocompression bonding, or high frequency welding.

[0034]

As described above, according to the present invention, the external electrode can be stuck to the outer peripheral surface of the envelope simply by rolling the envelope on the sheet structure, The electrodes are translucent
Since there is no need to adjust the distance between the external electrodes at the time of pasting, the work efficiency is significantly improved even if manual work is performed. it can.

Further, if an adhesive layer is formed on one surface of the translucent sheet in the sheet structure, the sheet can be simply moved by rolling the envelope 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.

Further, in a state in which the sheet structure is wound around the outer peripheral surface of the envelope, the ends of the translucent sheet are connected to the envelope.
Are welded by being overlapped along the outer peripheral surface of the external electrode, so that the translucent sheet is not peeled off, and the coating reliability of the external electrode can be improved. In particular, if the thickness of the light-transmitting sheet is set in the range of 20 to 100 μm, peeling of the overlapped portion at the end can be reliably prevented, so that not only the welding operation is facilitated, but also a desirable insulating property is obtained. can get.

Further, since the external electrode is designed 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 OA equipment such as a facsimile and a high voltage is applied at the time of use, sufficient insulation can be ensured not only between the external electrodes but also between the ground and the ground.

[Brief description of the 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 longitudinal sectional view for explaining the method of the present invention.

FIG. 6 is a longitudinal 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]

 Reference Signs List 1 envelope 2 light emitting layer 2a aperture 3 sheet structure 4 translucent sheet 4a, 4b end 5, 6 external electrode 51, 61 terminal 7 first opening 8 second opening 9 Adhesive layer 10 Protection tube

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01J 65/00 H01J 9/02

Claims (9)

(57) [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 light-transmitting sheet made of an insulating member wound so as to cover the external electrode, on an outer peripheral surface of the envelope, wherein ends of the light-transmissive sheets extend along the outer peripheral surface of the envelope; heavy <br/> I with tailored to rare gas discharge lamp, characterized in that welded the overlapping portions. Wherein said translucent sheet, an adhesive layer having an adhesive or adhesive function to the surface of the envelope side, the light-transmitting sheet to the outer peripheral surface of the envelope, the outer peripheral ends to each other Along the plane
2. The rare gas discharge lamp according to claim 1, wherein the superposed portion is wound and adhered so that the superposed portion is welded. 3. A straight tubular envelope having a light-emitting layer on the inner surface, and a pair of strip-shaped metal members on one surface of a translucent sheet having a length substantially equal to the entire length of the envelope. A sheet structure in which external electrodes are arranged apart from each other, the sheet structure on the outer peripheral surface of the envelope, the external electrode is located between the envelope and the light-transmitting sheet, and A rare gas discharge lamp, wherein sheets are overlapped with each other along the outer peripheral surface of an envelope , and the overlapped portions are welded. 4. An adhesive layer having a sticking or adhering function is formed on the sheet structure, and the sheet structure is overlapped on the outer peripheral surface of the envelope, and the ends of the light-transmitting sheets are overlapped with each other along the outer peripheral surface. 4. The rare gas discharge lamp according to claim 3, wherein the overlapped portion is welded while being wound so as to be bonded. 5. The thickness of the translucent sheet is 20 to 100.
4. The method according to claim 1, wherein the distance is set in a range of μm.
A rare gas discharge lamp as described. 6. A sheet comprising: a straight tubular envelope having a light-emitting layer on the 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 structure is configured by disposing a pair of band-shaped external electrodes made of a metal member on one surface of a light-transmitting sheet having a length substantially equal to the entire length of the envelope, and separating the two from each other. While overlapping the ends of the translucent sheet with each other along the outer peripheral surface of the envelope in a state of being wound around the outer peripheral surface of the container ,
A rare gas discharge lamp characterized in that an overlapped portion is welded. 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, and arranging a light emitting layer on an inner surface. A step of positioning the envelope having a straight tubular shape on the sheet structure so that the longitudinal direction thereof is along the longitudinal direction of the external electrode, and by moving the envelope or the sheet structure relative to the outer peripheral surface of the envelope. Winding the sheet structure, overlapping one end of the light-transmitting sheet with the other end along the outer peripheral surface of the envelope ; Welding the overlapped portion at the end of the conductive sheet. 9. An adhesive layer having a sticking or adhering function is formed on the sheet structure, and the sheet structure is overlapped on the outer peripheral surface of the envelope with the ends of the translucent sheet along the outer peripheral surface. 9. The method for manufacturing a rare gas discharge lamp according to claim 8, wherein the overlapped portion is continuously or partially ultrasonically welded along the longitudinal direction after being wound and bonded so as to be joined.