JPH07288107A - Small-sized rare gas discharge lamp eleltrode and manufacture thereof - Google Patents

Abstract

PURPOSE: To manufacture a small-sized neon lamp electrode capable of generating an arc at a precise position and enduring an extended service life with a number of starting counts. CONSTITUTION: In a method of manufacturing a neon lamp electrode comprising a lead member 12, a container 20, and a radiation coating 40, a needle 44 having a certain amount of radiation substances is advanced in a sleeve 20. This needle is rotated at a high speed, and a radiation substance is attached to a sleeve inner wall. The sleeve is coaxially clamped and processed to a lead, and a hollow negative electrode of a narrow inlet having radiation coating equally and clearly positioned is formed.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to electric lamps and more particularly to discharge lamps. More particularly, the present invention relates to small electrodes for neon or other rare gas discharge lamps.

[0002]

BACKGROUND OF THE INVENTION Rare gas discharge lamp electrodes are usually made by first dipping a wire or coil in a slurry of a radioactive material and a carrier medium or solvent. The radioactive material is sequentially baked to expel the carrier fluid. The lamp discharge in turn emits from the burning emissive material. When the wire and radioactive material are heated, the material can sputter from the electrodes,
And then it is deposited on the lamp wall. The sputtered material blackens the lamp and ultimately reduces the emissivity of the electrode. It is not uncommon to enclose a radioactive electrode in a can or container due to sputtering hermeticity. The sputtered material is partially trapped inside the container and easily reattaches to the container wall.

For larger electrodes, the radioactive material can be sprayed in the container. Immersion coats both the interior and exterior of the vessel and the external radioactive material draws the discharge to its external area. The discharge from the outside of the vessel approaches the envelope wall, which in turn can heat the envelope wall and the vessel irregularly, which adversely affects lamp life. Immersion also facilitates a large amount of material assembly due to irregular attachment to the electrodes. These irregularities result in hot spots or cold spots on the electrodes that cause distortion in the position of the arc and overheating of the electrodes or the envelope wall.

Sprays do not work well in small volumes. Small cracks interfere with the coating or instead accumulate excess coating. The spray is also easy to cover the inside of the container without division. It has been found that there is a need for a method of coating only certain areas inside the container, rather than coating everything inside the container. Furthermore, if the container is small (less than 1 cm)
Spraying becomes difficult. Atomization becomes even more difficult when the container is less than a few millimeters in diameter. The spray does not reach all parts of the container evenly, leaving some areas coated and other areas overcoated.

For lamps to provide rapid light output, the electrodes should have a minimum mass or mass for rapid heating. Dip and spray coatings can coat electrodes in their entirety, leaving a coating of radioactive mass that takes a long time to heat to some sufficient condition. Conversely, for life, the electrodes should be heavy and large and should be sufficiently coated to continue working despite material erosion. Balancing long life and response requires consideration. At this time, there is a demand for a coating method for uniformly but minimally coating the inside of the electrode container. Manufacturing costs and time are important for mass produced lamps. There is another need for inexpensive electrode manufacturing with fast response and long life.

Chemical vapor deposition (CVD) can be used for electrode coating, but has similar disadvantages. The coating can be even, but there is no selectivity for coating application. The vapor coats one area more easily than another, causing irregularities.
There is a need for a method to evenly coat the interior of a small electrode container.

It is known that neon lamps emit red light, thus providing the opportunity for unfiltered vehicle stop lights. A typical neon lamp has a diameter of about 1 or 2 which contains a diffused gaseous neon plasma light source.
It is a long tube of cm. These lamps typically have an input of 1100 to 1200 volts with a power of a few milliamps. These lamps emit diffuse low intensity light with a certain chromaticity that is not consistent with automotive standards. Although the warning light from the stop light does not have to match the rigorous illumination pattern of a headlight, there are still characteristic specifications that must be met to a degree that red light is well visible at great distances. The light must therefore be reflected and focused so that it is focused downwards towards the roadway for proper visibility. A light source having a diameter of 1 or 2 cm is not efficiently reflected or collected. There is a demand for small diameter neon stop lights.

SAE has found that a single bright spot is not as easily visible as a wide light source. SAE therefore requires a diffuse light source. In a typical taillight, using a tungsten filament lamp behind the red filter, the viewer usually sees a hot spot where the white lamp overwhelms the red filter. When moving away from the hot spot, the light appears lower white or yellow and is more reddish but at the same time less bright. A typical motor vehicle stop light varies in color and illumination across the surface. These changes are perceived by car designers as unaesthetic. There is a need for vehicle stop lights that have an even distribution of color and illumination intensity.

Neon sign lamps have large electrodes at each end that provide high durability. The large electrode is also substantially equal to the large blackening length at each end of the lamp tube. The blackened lamp ends frustrate vehicle designers who seek to provide even illumination across the lamp face. Vehicles require small reflectors and lenses due to reduced wind resistance, reduced vehicle cost and improved conformance flexibility. There is a need for a small diameter neon lamp that provides a large lumen number without the formation of elongated blackened sites at each end.

There are narrow tube neon lamps. These lamps can have tube diameters of a few millimeters and small electrodes and can provide very low output wattage. These lamps are used in artistic signs that are visible only a few feet. Small tubes do not emit enough light to be visible enough for automobile use. Alternatively, a narrow central tube is connected to the wide end that surrounds a conventional large electrode. The larger electrode provides increased power without undue electrode erosion, but again has a large blackening site towards the large electrode at each end.

It is expected that some vehicle stop lights will provide 100,000 to 800,000 lamp starts within the 2000 hour operating life range. It is expected that conventional neon lamps will only provide such benefits by increasing the size of the electrodes resulting in diffused light sources and blackened sites. The miniaturization of conventional electrodes results in a lamp that sputters the electrode which results in a short lamp life and also covers the interior of the lamp, thereby blackening the lamp and changing the lamp color. In any case the result will be unacceptable for a car. There is a need to create a small diameter neon lamp that can provide long life service or service in an automobile without failure and with substantially no change in color or brightness. In addition, there is a need to create neon lamp electrodes that do not visibly degrade and are compact over the expected life of the lamp.

Prior Art Example: US Pat. No. 2,874,324 issued to GF Klepp et al. Dated February 17, 1959 for an electric gaseous discharge tube shows a neon discharge component having a mercury pressure of about 25 mm. The choice of electrode size and lamp pressure optimizes the voltage regulation of the component and shifts the temperature induced response changes within the component.

US Pat. No. 2,811, issued to KJ Germeshausen on Nov. 5, 1957, for gaseous discharge components.
No. 2,465 shows a xenon discharge lamp using a hollow cathode. In FIG. 4, the electrodes are shown as surrounded by an open-ended cylinder held at one end by a wire mesh. The container and wire mesh structure trap the sputtered material.

US Pat. No. 2,847,605 issued to AA Byer on Aug. 12, 1958 for fluorescent lamp electrodes shows a fluorescent lamp having a hollow cathode electrode. The cathode interior is described as having a graded emission material leading to a maximum thickness at the rim of the cup. The coating is described as being formed by spraying or dipping.

US Pat. No. 3,505,553 issued to PTJ Piree on Apr. 7, 1970 for low pressure mercury vapor lamps without radio interference shows a radiant material with a boron component useful for radio interference suppression. . The emissive material is coated on the inner wall of the container-type electrode. The specific coating method is not described.

William E. Buescher, April 29, 1975, on a cathode for an electronic discharge component having a high adhesion emissive coating containing nickel and nickel coated carbonate.
U.S. Pat. No. 3,879,830, issued to Dr. U.S. Pat. The coating material is ground to a fineness sufficient to allow liquid spraying.

Harry W. Aptt Jr., September 16, 1975, on ceramic cup electrodes for gas discharge components.
U.S. Pat. No. 3,906,271 issued to U.S. Pat. The radioactive granules are pressed and sintered in a container to lock the material in place.

US Pat. No. 3,969,279 issued to Edmond R. Kern, dated July 13, 1976, for a method for treating an electron-emitting cathode, discloses heat treatment of radioactive material at an electrode for removal of excess barium. Show the method.

US Pat. No. 4,461,2970 issued to John M. Anderson on July 24, 1984 for shielded hollow cathode electrodes for fluorescent lamps discloses one container in the other. Figure 6 shows several hollow containers arranged coaxially. The electrode coating is described as being conventional and there is no description of how the coating is applied.

Be, dated August 6, 1985, regarding a method for producing a thermionic cathode and a thermionic cathode produced by the method.
U.S. Pat. No. 4,533,852 issued to rtohold Frank et al. shows a hot cathode type electrode having a vessel which is internally coated by chemical vapor deposition.

[0021]

SUMMARY OF THE INVENTION A mini neon lamp electrode has a coating of electrode lead ends, positioning of a quantity of fluid emissive coating material at a needle end, a rim defining a first inlet and an inner diameter of 5. It may be formed by advancing a needle end and an amount of radiation coating material into a tubular can or container having an inner wall defining a cavity of less than 0.0 mm and a second inlet. The needles are successively rotated to deposit the emissive coating material on the inner wall. The coated inner end of the electrode lead is the second
Is inserted through the inlet and positioned within the cavity. The lead and container are sequentially bonded, leaving a first inlet opening to the cavity and a coated inner wall. The coated emissive material is hardened on the inner wall.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a partial cutaway cross-sectional view of a preferred embodiment of a miniature electrode positioned within a lamp envelope. Like reference numerals refer to like or corresponding parts throughout the drawings and specification. The miniature neon lamp electrode 10 is assembled from the lead member 12, the can or container 20 and the radiation coating 40. The electrodes 10 are sequentially sealed within the lamp envelope 32.

The lead member 12 is made of molybdenum to have the form of a blanket circular wire. Molybdenum is selected to closely match the thermal expansion properties of hard silica borosilicate glass suitable for use in lamp envelope 32. Usual quartz encapsulation structures using tungsten electrodes, molybdenum encapsulation foil and external molybdenum leads can be used but would be more expensive. The circular lead member 12 has a diameter 14
And an inner end portion 16. The lead diameter 14 is small to suppress heat conduction to the lamp encapsulation, but large enough to provide adequate electrical conduction for discharge and large enough to mechanically support the tip structure of the electrode 10. To be selected. In the preferred embodiment, the lead member 12 is butt welded to the end of the outer lead 18 having the larger diameter and thus mechanically strong.
A preferable inner lead diameter 14 is 0.38 to 0.79 mm (
0.015 to 0.030 inch). The lead end 16 is preferably planar and perpendicular to the axis of the lead 12. The preferred outer lead 18 has a diameter that is about 1.00 mm (0.04 inch).

The container 20 can be made of any high temperature material and is preferably an electrically conductive material. Tungsten, molybdenum or nickel are suitable metals to use. Applicants prefer nickel or nickel alloys in the form of blanket hollow tubes. The container 20 has a rim portion 2
2, overall length 24, inner diameter 26, thickness 28 and outer shape 30
Have. The rim portion 22 is along the innermost boundary of the electrode 10. The overall length 24 is sufficient to enclose the internal electron-generating region and the means for coupling the lead member 12 to the container 20. The inner diameter 26 accommodates the lead end,
Sufficient to contain the inner coating of the emissive coating 40 and at least partially include some of the sputter material. The inner diameter 26 should not be so small as to limit electron production below that required for sustaining the intended discharge. The inner diameter 26, on the other hand, allows the arc discharge to wander or allow sputtered material from the enclosure portion of the lead member 12 or the enclosure 20 to be immediately lost to the enclosure lamp space. It shouldn't be big. The preferred inner diameter 26 is 0.38 mm (0.015 inc, which is the same diameter as the smallest lead wire).
h) from 1.5 mm (0.060 of the largest sized container 20 that can be reasonably located within the narrow lamp envelope 32)
Inch).

Vessel thickness 28 is intended for vessel 20 to withstand operating temperatures over lamp life (estimated to be 200,000 starts with frequent shocks and vibrations and 10,000 hours of operation), typical of automotive use. Selected to be strong enough. On the other hand, the thickness 28 is chosen as small as possible to limit the total electrode mass and thereby allow rapid heating of the electrode tip structure. The preferred thickness 28 is 0.348-
0.414 mm (0.0137-0.0163 inc
h). Outer diameter 30 is 1.466 to 1.481 mm
The range is (0.0577 to 0.0583 inch). The outer diameter 30 should not be large enough to close the gap between the electrode 10 and the surrounding lamp envelope 32, and should be less than the amount that causes the lamp envelope 32 to overheat and devitrify or distort. Should be. A reasonable gap between the vessel 20 and the envelope 32 was found to be about 0.765 mm (0.03 inch) for a 3 mm inside diameter lamp.

The lead end 16 mates with one end of the container 20 and the inner end 16 of the lead member 12 extends into the container 20 with an inner offset between the inner lead end 16 and the rim 22. Leave a distance of 34. Lead end 16 and rim 2
There is a total cavity 36 that is substantially defined by 2 and the inner wall of the container 20. It is believed that the entire cavity 36 is where most of the arcing electrons are generated and most of the electrode heat is generated. The total cavity 36 should be long and narrow to provide the electron-generating response of the hollow cathode. In particular, the total cavity 36 area preferably has an axial length to diameter ratio of greater than 1.5.

The lead member 12 and the container 20 are bonded together on one side towards the lamp encapsulation. Many coupling methods are available. The applicant has crimped or crimped the nickel tube forming the container 20 onto the molybdenum lead member 12 and each has four indentations.
We have found it convenient to make two loops. The indentation of each annulus is spread 90 degrees around the container 20. Two annuluses of crimped indents lock lead member 12 and container 20 in place, axially align lead member 12 and container 20 and cause container 20 to oscillate (rotate across axis). ) Of.

With the lead member 12 and the container 20 crimped together, the connection between the lead member 12 and the container 20, the inner wall of the container 20 and the lead end 16 are substantially distinct. A narrow cavity 38 is formed. The narrow cavity 38 is a separate electron source. Narrow cavity 38
The lead end 16 forming the electrode is the hottest part of the electrode 10 and is considered to be the region most likely to sputter or release material. The restrained distance between the lead end 16 and the container 20 within the narrow cavity 38 serves to trap and retain sputtered material. The wall-forming material of the narrow cavity 38 is in turn reasonably contained within the narrow cavity 38. The preferred axial length of the narrow cavity 46 is otherwise equal to what would be the heated tip of the unencapsulated electrode 10. Applicants use a diameter ratio of the lead member 12 to a length of the narrow cavity 46 that is 1/3 or less.

The emissive coating 40 should be a material having a low work function to improve electron generation, thereby reducing the required operating voltage of the lamp. The emissive coating 40 should have sufficient thermal and mechanical durability to last under operating conditions. Specifically, the electrode is 1 cm
40 to 70 volts (RMS) per electrode distance and 1
It is designed to provide about 0.5 to 5.0 milliamps (RMS) per cm electrode distance. Best operating value is about 2.2 milliamps (RMS) per 1 cm electrode distance
Is considered to be. Lamp wattage can range from about 5.0 to 50.0 watts, and longer lamps have greater wattage. Lamp pressure is also related to electrode performance. Preferred colors below 10 Torr (SAE red)
Is difficult to achieve and the electrodes sputter. With increasing pressure the color improves and the electrodes last longer. Above 300 torr, it is increasingly costly to meet ballast or stabilization requirements. Preferred pressure is 10-200
Torr, especially in the range of 50 to 130 Torr. Applicants use low work function emissive materials in ceramic binders. The preferred emissive coating 40 is an alumina and zirconium getter material known as Sylvania 8488. The radiation coating 40 is about 4 weight percent alumina powder,
It is formed as a slurry of water and acetone with 36 weight percent zirconium and 15 weight percent binder. The emissive coating 40 is applied to form a thin layer of coating over substantially all of the inner exposed surface of the full cavity 36 and narrow cavity 38. The lead end 16 is coated downward toward the site where the lead end 12 and the container 20 are joined. The inside of the container 20 is also coated downward toward the site where the lead member 12 and container 20 are joined. The radiation coating 40 should be uniform. The uneven radiation coating 40 results in uneven electron generation and uneven heat distribution over time. Uneven heating and heat transfer results in a strained electrode that produces a poorly placed arc and wears more quickly. Radiation coating 40
Should be thick enough to provide good emission over the life of the lamp, but not thick enough to cause significant delamination, flakes or other erosion. 1.0
A preferred coating weight of milligrams is evenly and smoothly coated inside the container.

The preferred emissive coating 40 does not extend to the rim portion of the container 20. In the preferred embodiment, the rim portion 22
There is an uncoated band 42 at the periphery just inside the entrance to the container 20. The radiation coating 40 is the uncoated strip 4
2 is offset from the rim portion 22. Band 42
There is a reduced electron emission at. The offsetting of the rim portion 22 from the radiation coating 40 helps limit the amount of sputter material that can be emitted from the container 20 and deposited on the envelope 32. The material emitted axially from the container 20 is probably evenly distributed on the envelope 32 and thus has a minimal effect. A substance that is emitted into the inlet of the container 20 at a sharp angle, such as a substance that might otherwise be sputtered from the uncoated strip 42.
Will probably be deposited on the envelope 32 near the tip of the electrode 10 in a considerable amount. A considerable amount of deposition causes the lamp to fade or discolor,
The deterioration of the material of the envelope 32 is enhanced. Uncoated strip 42
Will then help increase lamp life. The uncoated strip 42 preferably has an axial extent of 1/2 or more of the inner diameter 26. The preferred inner wall is preferably coated smoothly and evenly to a sufficient depth with a slurry of zirconium and alumina to leave about 1.0 milligram of emissions after the slurry has been dried and cured in place.

A nickel container 20 surrounds the radiator tip and is slightly further into the tubular envelope than the innermost portion of the rod of the electrode 10 and the radiation coating 40 is, perhaps 2.0 millimeters. , Has been extended. Material of the radiation coating 40 or electrode 10 that may sputter from the emitter tip is likely to be contained within the extension vessel 20. In the manufacture of the small electrode 10, since the electron emission site outside the container 20 is easily drawn to an external location where an arc discharge is generated, uneven local heating near the envelope wall is caused, and thus the radiation coating 4
0 requires consideration that it is not attached to the outside of the container 20. Uneven heating causes material degradation of adjacent envelope 32 and shortens lamp life.

The electrode 10 is made by first precisely dipping the ends of the lead member 12 into the radiant material 13 (FIG. 2A) and curing the coating in place with moderate heat (FIG. 2B). To be In the preferred procedure, the inner end 16 is about 37.7.
Slightly heated to 100 ° F. (100 ° F.) and sequentially immersed in a slurry containing the radiation coating material. The coated inner end 16 is slowly dried and cured with sufficient heat in order to drive off any organic or other volatile material that would interfere with lamp operation. Multiple dips and cures can be used to deposit the radiation coating 40 of sufficient thickness.

The containers are sequentially placed and held within the jaw members of the crimping device 48 (FIGS. 2C, 2D). Needle 44 is attached so that a small amount of radioactive material 13 is retained at the end of needle 44.
Are immersed in the radiant material 13 (FIG. 2E). Applicants use a needle 44 having one or more small cross holes 46 to draw some emissive material 13 into the cross holes 46. Small cavities will work much the same.

The end of the needle 44 is progressively advanced axially into the container 20 (FIG. 2F). The needle 44 is axially positioned with one or more intersecting holes 46 facing the inner region of the container 20 to be coated. Needle 44 is sequentially rotated (FIG. 2G), causing radioactive material 13 to roll off needle 44 and applied to the adjacent inner wall of container 20. The emissive material 13 is deposited on the needle 44 in the coated area, i.e. in the strip opposite the location where the cross hole 46 is located. The selective positioning of the cross holes 46 in turn allows selective deposition of the inner wall of the container. By placing needle 44 and cross hole 46 low enough on needle 44,
An uncoated strip 42 around the rim 22 of the container 20 can be formed. Repeated tumbling deposition and curing can be used to build up the emissive coating 40 to the desired thickness. The lead member 12 and the container 20 are sequentially coupled.
In a preferred method, the container 20 is a crimping machine 4
8 and the pre-coated lead end is advanced to place inner lead end 16 in container 20 accordingly. The container 20 is sequentially crimped into a lead member by the crimping tool 48 (FIG. 2I). The crimping preferably results in coaxial alignment of the lead member 12 and the container 20. The electrodes are sequentially vacuum baked to separately ensure that no extraneous or foreign material is introduced into the lamp.
The electrodes 10 are sequentially inserted and sealed in the lamp envelope 32 by standard methods (not shown).

In working example, some of the dimensions are approximately as follows: The inner lead member is made from molybdenum and 0.5 mm (0.02 inch)
Had a lead diameter of. The end of the lead is 2.0 mm (0.0
About 78 mg (78 inch) of axial length was coated to a thickness sufficient to leave about 1.0 mg of curing radiation in place. The outer lead member was made from nickel-plated stainless steel wire and had a lead diameter of 1.0 mm (0.40 inch). The inner and outer lead members were butt welded together and had a bond length of 50.54 mm (2.0 inch). The container is made from nickel and 6.00
mm (0.236 inch) length and 1.09 mm (0.
043 inch) and 1.473 mm (0.05
The outer diameter was 8 inches). The container is 0.38 mm (0.015 inch) to 4.31 mm from the rim of the container
It was internally coated with a strip portion extending to (0.170 inch). An uncoated strip of 0.38 mm (0.015 inch) was left around the inside of the rim. About 1.0 mg of dry radioactive material was deposited inside the container. This provided an area density of about 0.075 g / mm 2.
Concentrations of 0.050 to 0.100 per square millimeter are considered practical. The coated lead member and the coated container were sequentially crimped together. In crimping, the lead member and the container were coaxially coupled. The inner end of the lead member is offset inward from the rim of the container by 2.0 mm (0.078 inch). Offsets of the lead ends relative to the rim that are equal to or greater than the inner container diameter are preferred. 1. About the coated lead member
0 mm (0.078 inch) was exposed at the depth of the container before crimping bonded the container to the lead member.

[Brief description of drawings]

FIG. 1 is a partial cutaway cross-sectional view of a preferred embodiment of a miniature electrode positioned within a lamp envelope.

FIG. 2 is a schematic diagram showing a configuration step of a small electrode.

[Explanation of symbols]

 10 Small Neon Lamp Electrode 12 Lead Member 20 Container 32 Lamp Enclosure 40 Radiation Coating

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H01J 61/073 F 61/26 Z 61/36 B

Claims (19)

[Claims] 1. A lead end having: a) a lead member having a diameter and an inner end portion; b) a rim portion defining an inlet and an inner wall portion defining an inner diameter of 5.0 mm or less; Small neon lamp electrode having a tubular container coupled to the lead end due to the surrounding of the part and the deviation of the lead end from the rim, and c) a radiative coating evenly formed on the inner wall of the container. 2. The miniature neon lamp electrode of claim 1, wherein the enclosed lead ends are further coated with a radiant material. 3. The small neon lamp electrode according to claim 1, wherein the inside of the lead member is narrower than the outside of the lead member. 4. The mini neon lamp electrode according to claim 1, wherein the container has an inner diameter of 2 mm or less. 5. The mini neon lamp electrode of claim 1, wherein the container has a wall thickness of 0.5 mm or less. 6. The mini neon lamp electrode according to claim 1, wherein the container has a total length of 10 mm or less. 7. The miniature neon lamp electrode of claim 1, wherein the inner length is about twice the length of the surrounding portion of the lead member. 8. The small neon lamp electrode of claim 1, wherein the inner end of the lead member is offset from the rim of the container by at least the inner diameter of the container. 9. The miniature neon lamp electrode of claim 1, wherein the emissive coating includes a getter. 10. The mini neon lamp electrode of claim 1, wherein the inner wall around the rim portion of the container is not coated with the radiation and the other parts inside the container are coated with the radiation. 11. The miniature neon lamp electrode of claim 1, wherein the emissive coating has an areal concentration of 0.05 to 0.1 g per square millimeter. 12. The miniature neon lamp electrode of claim 1, wherein the emissive coating has an areal concentration of about 0.0075 g / mm 2. 13. A) locating a quantity of fluid radiant coating on the needle end, b) locating the needle tip and a quantity of radiant coating material on the rim portion defining the first inlet and not more than 5.0 mm. Advancing to a tubular container having an inner wall defining a cavity having an inner diameter and a second inlet, c) turning the needle to deposit the radiation coating material on the inner wall, and d) the electrode lead member. Inserting the inner end through the second inlet, e) coupling the lead member with the container, leaving the first inlet opening to the cavity and the coated inner wall, and f) the radiation deposited on the inner wall. A method of making a mini neon lamp electrode comprising curing a material. 14. The method for manufacturing a miniature neon lamp electrode according to claim 13, further comprising coating the electrode lead end and positioning the coated lead member lead end in the cavity. 15. The method of claim 13, wherein the needle includes at least one cavity for holding a quantity of emissive material. 16. The container is crimped to the lead end for coaxial alignment of the lead member and the container.
Manufacturing method of small neon lamp electrode of. 17. A radiator is coated on the inner wall of the container,
14. The method for manufacturing a miniature neon lamp electrode according to claim 13, wherein a radiation-free region is left around the inner surface of the first inlet. 18. The container is symmetrically crimped to coaxially position the container with respect to the lead member.
Manufacturing method of small neon lamp electrode of. 19. The method of manufacturing a small neon lamp electrode according to claim 13, wherein the lead member is advanced into the container to leave a deviation from the end of the lead toward the first inlet that is at least equal to the inner diameter of the container.