JPH09245737A - Lamp and rare gas discharge lamp and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp and a rare gas discharge lamp with their stable quality and high reliability and manufacture thereof capable of mechanizing manufacture process and more efficient productivity by means of relatively simple constitution. SOLUTION: This discharge lamp is provided with a glass bulb 2 having a light emission layer 3 on its inner face and having sealing portions 4A and 5A due to diameter contraction processing based on heating and softening at its ends, a pair of band-shaped external electrodes spaced and arranged each other on the outer circumference face of the glass bulb 2, and rare gas sealed in the internal space of the glass bulb. Of the foregoing sealing portions, one sealing portion 4A is so constituted as to be almost flat and the other sealing portions 5A are constituted so that a welded portion 5Aa during diameter contraction processing are recessed into the glass bulb, thereby enabling mass- production.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A conventional rare gas discharge lamp of this type is constructed, for example, as shown in FIGS.
5745). That is, 1 is a rare gas discharge lamp. Two
Is a glass bulb made of, for example, lead glass, soda glass, boro-silicate glass, etc., and a light emitting layer 3 made of a fluorescent material such as a rare earth fluorescent material or a halophosphate fluorescent material is formed on the inner surface thereof. The light emitting layer 3 has an aperture portion (light emitting portion) 2A on which no fluorescent substance is adhered, but the light emitting layer 3 can be formed on the entire inner peripheral surface of the glass bulb 2. . Also, the end 2 of this glass bulb 2
Disc-shaped sealing members 4 and 5 made of, for example, a glass member having a lower melting point than the glass bulb 2 are sealed in a and 2b. In the inner space of the glass bulb 2, rare gas such as xenon (Xe), krypton (Kr), neon (Ne), or helium (He) which does not contain metal vapor such as mercury is mixed alone or mixed. Although a predetermined amount of rare gas containing xenon as a main component is filled in, for example, 20 to 11
It is desirable to seal at a pressure of 0 Torr. On the other hand, on the outer peripheral surface of the glass bulb 2, for example, aluminum, copper,
A pair of external electrodes 6 and 7 made of a non-translucent metal member such as silver or nickel and having a small thickness are arranged so as to face each other across the light emitting portion 2A.

In this rare gas discharge lamp 1, a high frequency high voltage (for example, 2700 Vo-p at 28 KHz) is applied to the external electrodes 6 and 7.
Is applied to generate a discharge of xenon gas, the light emitting layer 3 is stimulated by the excitation line of the xenon gas to emit light, and light is emitted from the light emitting portion 2A between the side edges of the external electrodes 6 and 7. To be done. In particular, since no mercury is used in the rare gas discharge lamp 1, the light amount rises sharply after lighting, and the light amount is almost 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 document reading light source for facsimiles and the like.

[0004]

However, since this rare gas discharge lamp 1 is manufactured as follows, it has a problem that it is difficult to improve the productivity and the reliability of quality, which will be described later.

That is, first, the light emitting layer 3 is formed on the entire inner surface of the glass bulb 2 having a predetermined length, and then the aperture is formed.
The light emitting portion 2A is formed by removing the light emitting layer 3 in the portion corresponding to the tea portion (2A). Next, one sealing member 4 is inserted into the bottom of the vertical hole formed in the graphite jig, and the glass bulb 2 is placed on the sealing member 4. Next, this graphite jig is put into a vacuum chamber to make a vacuum, and the graphite jig is energized to heat the glass bulb 2 and the sealing member 4. As a result, the glass bulb 2 and the sealing member 4 are hermetically sealed.

Next, the graphite jig is attached to a vacuum chamber.
And pull out the glass bulb 2 from the hole. Then, the other sealing member 5 is inserted into the bottom of the hole of the jig, and the glass bulb 2 is placed on the sealing member 5. Next, this graphite jig is placed in a vacuum chamber to create a vacuum, and the inside of the vacuum chamber is set to a rare gas atmosphere having a predetermined pressure. As a result, the inside of the glass bulb also becomes a rare gas atmosphere having the same pressure. In this state, the graphite jig is energized to heat the glass bulb 2 and the sealing member 5. As a result, the glass bulb 2 and the sealing member 5 are hermetically sealed.

Next, as shown in FIGS. 6 and 7, the outer electrode 6, which has an adhesive layer on one surface on the outer peripheral surface of the glass bulb 2,
7 are attached so as to sandwich the light emitting portion 2A and to be separated from each other by a predetermined distance. And, although not shown,
While soldering the copper terminals to the ends of the external electrodes 6 and 7,
Solder an external lead-out harness (not shown) to the terminals. Next, the glass bulb 2 is dipped in the silicone varnish liquid and pulled up to deposit the silicone varnish on the surfaces of the glass bulb 2 and the external electrodes 6, 7. Then, for example, it is dried for about 1 hour. Thereafter, the glass bulb 2 is covered with a protective tube made of a heat-shrinkable resin, and the protective tube is heated to, for example, about 150 to 160 ° C. to be thermally shrunk to protect the outer peripheral surface of the glass bulb 2. By bringing the tube into close contact, a rare gas discharge lamp is manufactured.

As described above, the manufacturing process of the rare gas discharge lamp is mainly a batch process based on manual work as a whole.
The work efficiency is low and the yield is low, and it is difficult to expect satisfactory reliability. Particularly, in the step of sealing the glass bulb 2 and the sealing members 4 and 5, the sealing member 4 and the glass bulb 2 are inserted and arranged in the holes of the graphite jig, and further, the holes of the graphite jig are sealed. Since the member 5 and the glass bulb 2 have to be inserted and arranged, there is a problem that work efficiency is low and it is difficult to enhance mass productivity.

Moreover, the glass bulb 2 and the sealing members 4, 5
Since the sealing part of and is hidden in the hole of the graphite jig, it is not known at all whether or not they maintain the normal positional relationship until they are taken out from the graphite jig after the sealing work is completed. . For this reason, there is a problem in that the two may be sealed while their positional relationship remains displaced, and there is also a problem that a reliable rare gas discharge lamp of stable quality cannot be expected.

Therefore, an object of the present invention is to enable mechanization of the manufacturing process with a relatively simple structure, to effectively enhance the productivity, and to provide a reliable lamp with stable quality and a rare lamp. A gas discharge lamp and a manufacturing method thereof are provided.

[0011]

SUMMARY OF THE INVENTION Therefore, in order to achieve the above-mentioned object, the present invention has a glass bulb having a sealing portion formed on at least one end thereof by a diameter reduction process based on heating and softening. The fusing part at the time of reducing the diameter of the sealing part is recessed and positioned in the glass bulb.

A second aspect of the present invention is a glass bulb having a light emitting layer on its inner surface and a sealing portion at its end, and a pair of strip-shaped members arranged on the outer peripheral surface of the glass bulb so as to be spaced apart from each other. External electrodes and a rare gas enclosed in the inner space of the glass bulb, and the sealing portion is heated by the glass bulb.
Characterized by being formed by diameter reduction processing based on softening,
A third aspect of the present invention has a light emitting layer on the inner surface and has heating at the end.
A glass bulb having a sealing portion formed by a diameter reduction process based on softening, a pair of strip-shaped external electrodes arranged on the outer peripheral surface of the glass bulb apart from each other, and a rare gas sealed in the inner space of the glass bulb. Of the sealing parts, one of the sealing parts is configured to be substantially flat, and the other sealing part is configured such that the fusing part at the time of reducing the diameter is recessed into the glass bulb. .

In a fourth aspect of the present invention, a step of heating / softening a desired portion of the glass bulb after negative pressure is applied to the inner space of the glass bulb, and a step of heating / softening the heated / softened portion on both sides or on one side thereof. The process of pulling the positioned glass bulb part in a direction relatively away from it to melt and melt the heating / softening part, and heating / softening the melting part or the peripheral part separated from the melting part, so that the melting part becomes inside the glass bulb. And a step of sucking so as to make a recess.

Furthermore, a fifth aspect of the present invention is a step of heating and softening a desired portion on one end side of a glass bulb having a light emitting layer on the inner surface, and a step of forming a cullet in the heated and softened state. The method is characterized by including a step of pulling the glass bulb to reduce the diameter of the heating / softening portion and a step of fusing the reduced diameter portion to form one sealing portion.

In addition, a sixth aspect of the present invention is a step of heating and softening a desired portion on one end side of a glass bulb having a light emitting layer on the inner surface, and a side which becomes a cullet in a heated and softened state. In the step of heating and softening the step of pulling the glass bulb of No. 1 to melt and heat the softened portion to form one sealing portion, the step of heating and softening the desired portion on the other end side of the glass bulb, Using the process of pulling the glass bulbs located on both sides or one side of the heating / softening portion in the direction to relatively separate, to reduce the diameter of the heating / softening portion, and the opening on the other end side of the glass bulb. And a step of enclosing a rare gas in the internal space so that the pressure is lower than the atmospheric pressure, and a step of fusing the reduced diameter portion to form the other sealing portion. According to the invention, after the formation of the other sealing portion, By heating and softening a peripheral portion spaced from the blow portion or fusing portions in the same section,
It is characterized in that the fused portion is recessed so as not to project from the outer peripheral surface of the glass bulb.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. The same parts as those of the conventional example shown in FIGS. 6 to 7 are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, a characteristic part of this embodiment is that at least one end of the glass bulb 2 has a sealing portion 5A by a diameter reduction process based on heating and softening.
The fusing part 5Aa of A is recessed and positioned in the glass bulb. More specifically, the light emitting layer 3 is provided on the inner surface.
In addition, a pair of strip-shaped external electrodes 6 and 7 are arranged apart from each other on the outer peripheral surface of the glass bulb 2 having the sealing portions 4A and 5A at the ends, and one of the sealing portions 4A and 5A is sealed. Part 4A
Is substantially flat, and the other sealing portion 5A is configured such that the fusing portion 5Aa by fusing after the diameter reduction processing is recessed in the glass bulb.

This rare gas discharge lamp 1 is shown, for example, in FIGS.
It is manufactured as shown in FIG. First, as shown in FIG. 3A, the light emitting layer 3 is formed on the entire inner surface of the glass bulb 2 excluding the other end, and the light emitting layer corresponding to the light emitting portion 2A is removed. Next, as shown in FIG. 2B, one end 2a of the glass bulb 2 is supported by the first and second chucks 8 and 9 so as to be separated by a predetermined distance.
Then, the glass bulb 2 is attached to the first and second chucks 8 and 9.
While being rotated while being supported by, the predetermined glass bulb portion between the first and second chucks 8 and 9 is burner 10.
Heat with. The heating position of the glass bulb portion by the burner 10 is almost constant.

Next, as shown in FIG. 3C, when the heated portion of the glass bulb 2 is in the softened state, the first chuck 8 is pulled in the P direction while maintaining the rotating state. As a result, the diameter of the heated / softened portion of the glass bulb 2 is reduced. In addition, when pulling the first chuck 8 in the P direction, the rotation of the first chuck 8 is stopped and heating / heating is performed.
The softened portion can be twisted. Next, as shown in FIG. 3D, when the first chuck 8 is further pulled in the P direction, the heating / softening portion is further reduced in diameter and becomes thinner. Then, the reduced diameter portion is blown by the heating by the burner 10. As a result, a sealing portion 4A that hermetically closes the opening is formed at the end of the glass bulb 2 supported by the second chuck 9. The glass bulb supported by the first chuck 8 is discarded as a cullet. Furthermore, as shown in FIG.
By heating the fusing part 4Aa formed in the substantially central part of the glass bulb 2 by the burner 10, the sealing part 4A has a slightly thicker central part, but its shape is shaped to be substantially flat. To be done.

Next, as shown in FIG. 4 (a), the other end side of the glass bulb 2 is provided with an appropriate interval so that the third and fourth ends are provided.
Supported by the chucks 11 and 12, and the glass bulb portion between the chucks 11 and 12 is heated and softened by the burner 13. In this state, the reduced diameter portion 2B is formed by pulling one or both of the third and fourth chucks 11 and 12 in directions away from each other. The glass bulb 2 may be rotated when forming the reduced diameter portion 2B. Next, as shown in FIG. 2B, the other end of the glass bulb 2 having the reduced diameter portion 2B is mounted on the exhaust head 14 of the exhaust device, and the glass bulb 2 is attached to the fifth chuck 15. To support. Then, the glass bulb 2 is heated for degassing. After completion, a predetermined amount of a rare gas is sealed in the glass bulb 2 from the exhaust system. After that,
The reduced diameter portion 2B is heated by the burner 16. Then, when the fifth chuck 15 is pulled in the P direction away from the exhaust head 14 in accordance with the softened state of the heated portion, the reduced diameter portion becomes thinner, and the reduced diameter portion eventually becomes as shown in FIG. ,
Fused. At this stage, a sealing portion 5A that hermetically closes the opening is formed at the other end of the glass bulb 2 supported by the fifth chuck 15. In addition, a protrusion-shaped fusing part 5Aa due to chip-off is formed in a substantially central portion of the sealing part 5A. Next, as shown in FIG. 3D, the shoulder 5Ab of the sealing portion 5A is heated by the burner 17 while rotating the glass bulb 2 supported by the fifth chuck 15 in a fixed direction. Soften. Then, the fusing part 5Aa is recessed so as to be sucked into the glass bulb as shown in (e) of the same figure, and substantially does not protrude from the outer peripheral surface of the glass bulb 2. The fusing part 5Aa can be recessed in the glass bulb by heating the fusing part. After that, the rare gas discharge lamp is manufactured through steps such as the arrangement of the external electrodes 6 and 7 on the outer peripheral surface of the glass bulb 2 and the insulation treatment of the external electrodes 6 and 7.

According to this embodiment, since the sealing portions 4A and 5A at the ends of the glass bulb 2 are formed by reducing the diameter of the heating / softening portion of the glass bulb 2 and fusing the reduced diameter portion, The conventional disc-shaped sealing member can be completely omitted. Therefore, the cost of the rare gas discharge lamp can be effectively reduced, and the reliability of the quality can be improved by making the sealing form uniform.

Further, since the fusing part 5Aa of the other sealing part 5A is recessed in the glass bulb, an undesired external force does not act on the fusing part 5Aa in the assembly process. Therefore, for example, when a resin socket or the like is attached to the end of the glass bulb 2, damage to the fusing part 5Aa can be reliably prevented.

In particular, since the fusing part 5Aa of the sealing part 5A is recessed in the glass bulb, the shape of the glass bulb 2 can be made uniform, so that the glass bulb 2 can be easily incorporated into OA equipment.

Further, according to the above-mentioned method, one sealing portion 4
A can be formed into a substantially flat shape by pulling only the glass bulb 2 on the cullet side after the heating position by the burner 10 is made substantially constant during the diameter reduction work of the heating / softening portion. ~ It can be made compatible with the conventional rare gas discharge lamp shown in FIG.

In addition, a protruding fusing part 5Aa is formed on the other sealing part 5A. By heating the fusing part or the peripheral part of the fusing part, the inside of the glass bulb becomes a negative pressure than the atmospheric pressure. By utilizing the setting, the fusing part 5Aa can be easily recessed in the glass bulb.

Furthermore, the sealing portions 4A and 5A at the end of the glass bulb 2 do not require the use of a special sealing member as in the prior art, but simply reduce the diameter of the heating / softening portion of the glass bulb 2. Since it is formed by fusing the reduced diameter portion, not only can work efficiency be significantly increased,
Mass productivity can also be improved.

FIG. 5 shows another embodiment of the present invention, which has the same basic structure as the rare gas discharge lamp shown in FIG. The difference is that the fusing part 4Aa of the one sealing part 4A and the fusing part 5Aa of the other sealing part 5A are still in a state of protruding from the outer peripheral surface of the glass bulb 2.

According to this embodiment, each fusing part 4
Since the flattening and suction operations of Aa and 5Aa can be omitted, the workability can be further improved as compared with the above embodiment.

The present invention is not limited to the above-described embodiment. For example, the structure of the fusing portion of the other sealing portion into the glass bulb is not limited to the rare gas discharge lamp but the top seal. Shaped halogen bulbs, glow lamps and other lamps are also applicable. In addition, the other sealing part may temporarily seal the part outside the planned sealing part after sealing the rare gas in the glass bulb, and then formally seal the planned sealing part. it can. It is desirable to impart rotation to the glass bulb at the time of forming each sealing portion. However, the rotation is prevented from being imparted by arranging a plurality of burners radially around the outer periphery of the glass bulb. You can also. Further, the other end of the glass bulb can be blown by reducing the diameter after setting it in the exhaust device.

[0029]

As described above, according to the present invention, the respective sealing portions at the ends of the glass bulb are formed by reducing the diameter of the heating / softening portion of the glass bulb and fusing the reduced diameter portion. Therefore, not only the work efficiency can be remarkably increased, but also the mass productivity can be improved. In particular, when this structure is applied to a rare gas discharge lamp, the disk-shaped sealing member used conventionally can be completely omitted. Therefore, the cost of the rare gas discharge lamp can be effectively reduced, and the reliability of the quality can be improved by making the sealing form uniform.

Further, if the fusing part (chip-off part) of the other sealing part is formed to be recessed in the glass bulb, for example, an external electrode is arranged on the outer peripheral surface of the glass bulb or the outer periphery of the outer electrode. An undesired external force does not act on the fusing part in the assembly process such as applying insulation treatment to the surface or mounting a resin socket on the end of the glass bulb.
Therefore, in the assembly process, it is possible to reduce the occurrence of defective products due to breakage of the fusing part.

Moreover, if one of the sealing portions is flattened and the fusing portion of the other sealing portion is recessed into the glass bulb,
The shape of the glass bulb can be made uniform, and compatibility with conventional rare gas discharge lamps can be provided, so that the OA
Easy to incorporate into equipment.

In particular, one of the above-mentioned sealing portions is flattened by melting the heating / softening portion while reducing the diameter of the heating portion by making the heating position of the burner substantially constant and pulling only the glass valve on the cullet side. Can be achieved by doing. In addition, a protruding fusing part is formed in the other sealing part described above, but by utilizing the fact that the inside of the glass bulb is set to a negative pressure than atmospheric pressure, the fusing part or the fusing part The fusing part can be easily recessed into the glass bulb by heating the peripheral part of the. Therefore, mass production equipment can be realized, and productivity can be improved.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

3A and 3B are views for explaining a method of forming one sealing portion, where FIG. 3A is a side sectional view of a glass bulb having a light emitting layer formed on an inner surface thereof, and FIG. 3B is a chuck state of the glass bulb. The side view shown, (c) is a side view showing the reduced diameter state of the heating / softening portion, (d) is a side view showing the fusing state, and (e) is a cross-sectional view of the main part of the sealing portion.

4A and 4B are views for explaining a method of forming the other sealing portion, FIG. 4A is a side view showing a state where a reduced diameter portion is formed at the other end of the glass bulb, and FIG. A side view showing a state in which a glass bulb is attached to an exhaust head, (c) a side view showing a fused state, (d) a side view showing a state where a shoulder portion of a sealing portion is heated, (e) showing Sectional drawing of the principal part which shows the recessed state of a fusion cutting part.

FIG. 5 is a side sectional view showing another embodiment of the present invention.

FIG. 6 is a side sectional view of a conventional example.

7 is a vertical cross-sectional view of FIG.

[Explanation of Codes] 1 rare gas discharge lamp 2 glass bulb 2A light emitting part (aperture part) 2B reduced diameter part 3 light emitting layer 4A one sealing part 4Aa, 5Aa fusing part 5A other sealing part 5Ab shoulder part 6,7 External electrode 8, 9, 11, 12, 15 Chuck 10, 13, 16, 17 Burner 14 Exhaust head

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiaki Tomita 1-44-2 Jomi, Chuo-ku, Osaka-shi, Osaka NEC Home Electronics Co., Ltd.

Claims (7)

[Claims] 1. A glass bulb has at least one end portion with a sealing portion by a diameter reduction process based on heating and softening, and a fusing portion at the time of the diameter reduction process of the sealing portion is recessed into the glass bulb. -A lamp characterized by being positioned. 2. A glass bulb having a light emitting layer on an inner surface thereof and a sealing portion at an end thereof, a pair of strip-shaped outer electrodes arranged on the outer peripheral surface of the glass bulb and spaced apart from each other, and an inside of the glass bulb. A rare gas discharge lamp, comprising: a rare gas sealed in a space; and the sealing portion formed by a diameter reduction process based on heating and softening of a glass bulb. 3. A light emitting layer is provided on the inner surface, and heating is applied to the end portion.
A glass bulb having a sealing portion formed by a diameter reduction process based on softening, a pair of strip-shaped external electrodes arranged on the outer peripheral surface of the glass bulb apart from each other, and a rare gas sealed in the inner space of the glass bulb. Of the sealing parts, one of the sealing parts is configured to be substantially flat, and the other sealing part is configured such that the fusing part at the time of reducing the diameter is recessed into the glass bulb. Noble gas discharge lamp. 4. A step of heating and softening a desired portion of the glass bulb after reducing the internal space of the glass bulb to a negative pressure;
A process of melting and cutting the heating / softening part by pulling the glass bulb part located on both sides or one side of the heating / softening part in a direction to relatively separate, and heating / softening the melting part or the peripheral part separated from the melting part And a step of sucking the melted portion so that the melted portion is recessed into the glass bulb. 5. A step of heating and softening a desired portion on one end side of a glass bulb having a light emitting layer on an inner surface;
In the softened state, the method includes a step of pulling the glass bulb on the side to be the cullet to reduce the diameter of the heated / softened portion, and a step of fusing the reduced diameter portion to form one sealing portion. Noble gas discharge lamp manufacturing method. 6. A step of heating and softening a desired portion on one end side of a glass bulb having a light emitting layer on the inner surface, and heating and
In the softened state, a step of pulling the glass bulb on the cullet side to melt and heat the softened portion to form one sealing portion, and a step of heating and softening the desired portion on the other end side of the glass bulb. And in the heated / softened state, a step of pulling the glass bulbs located on both sides or one side of the heated / softened portion in a direction in which they are relatively separated from each other to reduce the diameter of the heated / softened portion, and the other end of the glass bulb. A step of filling a rare gas into the internal space so as to have a pressure lower than the atmospheric pressure by using the opening portion on the part side, and a step of fusing the reduced diameter portion to form the other sealing portion. A method for manufacturing a rare gas discharge lamp, characterized in that 7. After the formation of the other sealing portion, the fusing portion or a peripheral portion separated from the fusing portion of the same sealing portion is heated and softened so that the fusing portion does not protrude from the outer peripheral surface of the glass bulb. 7. The method for manufacturing a rare gas discharge lamp according to claim 6, wherein the rare gas discharge lamp is inserted.