CN114388342A

CN114388342A - Lamp sealing structure, lamp, and lamp sealing method

Info

Publication number: CN114388342A
Application number: CN202110994168.9A
Authority: CN
Inventors: 高桥浩; 池田富彦
Original assignee: Phoenix Electric Co Ltd
Current assignee: Phoenix Electric Co Ltd
Priority date: 2020-10-06
Filing date: 2021-08-27
Publication date: 2022-04-22
Also published as: KR20220045890A; TW202215489A; JP2022061375A

Abstract

Provided is a lamp sealing structure which is not easy to damage a light emitting tube and not easy to generate uneven illumination. A sealed structure of a lamp (10) having an arc tube (12) including an airtight internal space (24) and at least 1 sealing part (22) is configured as follows. A communication hole (26) for communicating the internal space (24) with the outside is provided in the seal section (22). In addition, a tip portion (28) for closing the communication hole (26) is formed at the outer end of the communication hole (26).

Description

Lamp sealing structure, lamp, and lamp sealing method

Technical Field

The invention relates to a sealing structure of a lamp, a lamp and a sealing method of the lamp.

Background

Conventionally, a widely used gas-filled lamp forms a space sealed inside a light-emitting tube (glass container) by sealing both ends or one end of the light-emitting tube by a pinch seal method.

Examples of gas-filled lamps include halogen lamps for heating applications and the like, metal halide lamps for lighting applications and the like, ultraviolet lamps for ultraviolet cleaning, discharge lamps, and the like (patent document 1 discloses an example of a "gas discharge lamp").

For example, in the case of the conventional discharge lamp 1 shown in fig. 17, after the pair of fitting portions 2 are inserted to seal both ends of the arc tube 3 in a pinch seal manner, the exhaust gas is discharged through the exhaust pipe 5 attached to the arc tube 3 so as to communicate with the internal space 4 in advance, as shown in fig. 18, after the impurity removal process such as heat treatment. Then, after a necessary sealing material is added to the internal space 4 to put the internal space 4 in a negative pressure state, the exhaust pipe 5 is heated and melted to seal the internal space 4, and the exhaust pipe 5 is removed to form the discharge lamp 1.

Further, in the case of sealing a halide in an internal space of an arc tube by using mercury light emission by generating discharge between a pair of electrodes, by using light emission by a light-emitting metal, or for the purpose of preventing blackening of the inner surface of the arc tube during lighting, as in a discharge lamp, it is necessary to add a necessary sealing material to the internal space before discharging gas through an exhaust pipe.

Documents of the prior art

Patent document

Patent document 1: JP 2000-306547 publication

Disclosure of Invention

(problems to be solved by the invention)

In the case of the conventional gas-filled lamp 1, as shown in fig. 17, after the inner space 4 is sealed, a "tip portion 6" as a mark of hermetic processing is formed on the surface of the light-emitting tube 3 facing the inner space 4. The tip portion 6 is a portion where stress generated in the arc tube 3 is concentrated, and is therefore weakest in strength, and when the lamp 1 is caused to emit light, the temperature rises to about 700 to 900 ℃, and is made of quartz glass (SiO) as a material of the arc tube 3₂) The structural breakdown of (2) is increased, and thus the arc tube 3 is easily broken from the tip portion 6.

Further, when the tip portion 6 receives ultraviolet rays having a wavelength of 200nm or less depending on the kind of the lamp 1, there is a problem that the structural destruction of the silica glass is more remarkably progressed.

Further, since the tip portion 6 is located at a position facing the internal space 4 where the light emitting portion such as an electrode is provided, there is a problem that: the light emitted from the lamp 1 is blocked by the tip portion 6, and uneven illuminance occurs on the irradiation target irradiated with the lamp 1.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a lamp sealing structure, a lamp, and a lamp sealing method, in which breakage of an arc tube is less likely to occur, and uneven illuminance is less likely to occur.

(means for solving the problems)

According to an aspect of the present invention, there is provided a sealed structure of a lamp including an arc tube having an airtight internal space and at least 1 sealing portion, wherein the sealing portion is provided with a communication hole for communicating the internal space with the outside, and a tip portion for closing the communication hole is formed at an outer end of the communication hole.

According to another aspect of the present invention, there is provided a sealed structure of a lamp including a light emitting tube having an airtight internal space and at least 1 sealed portion, an exhaust pipe that communicates the internal space with the outside being buried in the sealed portion, and a tip portion that closes the exhaust pipe being formed at an outer end of the exhaust pipe.

According to still another aspect of the present invention, there is provided a lamp including any one of the seal structures described above.

According to still another aspect of the present invention, there is provided a lamp sealing method for sealing at least 1 end portion of an arc tube to form an airtight internal space within the arc tube, the lamp sealing method including the steps of: when the end portion is sealed to form a sealed portion in the light emitting tube, a communication hole for communicating the internal space with the outside is formed, an exhaust tube is attached to an outer end of the communication hole, the exhaust tube is used for exhausting air from the internal space and sealing a sealed object into the internal space, and a root portion of the exhaust tube is heated and melted to form a tip portion for closing the communication hole.

According to another aspect of the present invention, there is provided a lamp sealing method for sealing at least 1 end portion of an arc tube to form an airtight internal space within the arc tube, the lamp sealing method including the steps of: the tip end portion is formed by sealing the end portion with an exhaust pipe inserted in the end portion to form a seal portion, and in a state where the internal space is communicated with the outside via the exhaust pipe embedded in the seal portion, exhausting from the internal space via the exhaust pipe and sealing a sealed object into the internal space, and heating and melting the exhaust pipe at an outer end portion of the seal portion to close the exhaust pipe.

(effect of the invention)

According to the sealing structure and the sealing method of the lamp of the present invention, the tip end portion for closing the internal space of the arc tube is formed at the outer end of the sealing portion away from the internal space. Since the outer end of the sealing portion is at a relatively low temperature (for example, 300 ℃ or lower) even during light emission of the lamp, the possibility that the structural destruction of the quartz glass progresses during light emission of the lamp and the arc tube is damaged from the tip portion can be reduced.

Further, since the tip end portion formed at the outer end of the sealing portion is not easily irradiated with light emitted from the inner space of the arc tube, the structural destruction of the quartz glass is not remarkably increased even when ultraviolet rays having a wavelength of 200nm or less are emitted depending on the type of the lamp.

Further, since the light emitted from the inner space of the arc tube is less likely to be irradiated to the tip portion, it is possible to reduce the possibility that the light emitted from the lamp is blocked by the tip portion and uneven illuminance is generated on the irradiation target irradiated with the lamp.

Drawings

Fig. 1 is a diagram showing a lamp 10 to which the present invention is applied.

Fig. 2 is an a-a line end view.

Fig. 3 is a diagram showing a manufacturing process of the lamp 10 to which the present invention is applied.

Fig. 4 is a diagram showing a manufacturing process of the lamp 10 to which the present invention is applied.

Fig. 5 is a diagram showing a manufacturing process of the lamp 10 to which the present invention is applied.

Fig. 6 is a view showing a state where the end portion of light-emitting tube 12 is sealed by shrinkage during the manufacturing process of lamp 10.

Fig. 7 is a view showing a state where the end portion of light-emitting tube 12 is sealed by shrinkage during the manufacturing process of lamp 10.

Fig. 8 is a diagram showing a process of manufacturing a lamp 10 to which the present invention is applied.

Fig. 9 is a diagram showing a lamp 10 according to modification 1.

Fig. 10 is a B-B line end view.

Fig. 11 is a diagram showing a process of manufacturing the lamp 10 according to modification 1.

Fig. 12 is a view showing a state in which the end portion of light-emitting tube 12 is sealed by shrinkage in the manufacturing process of lamp 10 according to modification 1.

Fig. 13 is a view showing a state in which the end portion of light-emitting tube 12 is sealed by shrinkage in the manufacturing process of lamp 10 according to modification 1.

Fig. 14 is a diagram showing a lamp 10 according to modification 2.

Fig. 15 is a diagram showing a lamp 10 according to modification 2.

Fig. 16 is a view showing a halogen lamp to which the present invention is applied.

Fig. 17 is a diagram showing a conventional gas filled lamp 1.

Fig. 18 is a diagram illustrating a manufacturing process of the conventional gas filled lamp 1.

Detailed Description

(Structure of the Lamp 10)

A configuration of a lamp 10 according to an example to which the present invention is applied will be described with reference to fig. 1 and 2. The lamp 10 is a discharge lamp and is roughly composed of a light-emitting tube 12, a pair of electrodes 14, a pair of foils 16, and a pair of lead bars 18.

The arc tube 12 is formed of, for example, quartz glass, and includes a light emitting portion 20 and a pair of sealing portions 22 extending from the light emitting portion 20. An internal space 24 sealed by the pair of sealing portions 22 is formed in the light emitting portion 20.

In addition, mercury 25 and a halogen (iodine, bromine, or a mixture of iodine and bromine) are sealed in a predetermined amount in the internal space 24 of the light emitting section 20.

The pair of electrodes 14 are substantially rod-shaped members formed of tungsten, and are arranged in the internal space 24 such that one ends of the electrodes face each other. The other end of each electrode 14 is electrically connected to one end of each molybdenum foil 16 embedded in each sealing portion 22.

The pair of lead bars 18 are substantially rod-shaped members made of molybdenum, and one end of each lead bar is electrically connected to the other end of each foil 16. The other end of each lead bar of the pair of lead bars 18 extends outward from each seal portion 22.

The structure of the sealing portions 22 will be described, and a communication hole 26 is provided in one sealing portion 22, and the communication hole 26 communicates the internal space 24 of the light-emitting tube 12 with the outside.

Further, a tip (tip) 28 that closes the communication hole 26 is formed at the outer end of the communication hole 26, that is, the outer end of the seal portion 22 where the communication hole 26 is formed. The communicating hole 26 and the internal space 24 are airtight to the outside by the pointed portion 28.

(Process for manufacturing Lamp 10)

Next, a manufacturing process of the above-described lamp 10 is explained. First, as shown in fig. 3, the arc tube 12 before sealing is prepared. The electrodes 14 and the lead bars 18 are attached to the foil 16 by welding or the like to form a pair of mounting portions 30.

Then, the end portion of the light-emitting tube 12 is sealed by inserting the mounting portion 30 from the electrode 14, and by shrink-sealing one end portion (the side where the mounting portion 30 is inserted) of the light-emitting tube 12 while holding the mounting portion 30 at a predetermined position. Thereby, as shown in fig. 4, one seal portion 22 is formed.

Next, the other mounting portion 30 is inserted into the other end portion of the light-emitting tube 12, and the other end portion is sealed by shrinkage. Thereby, the inner space 24 is formed in the substantially central portion of the light-emitting tube 12. At this time, the other end portion of the light-emitting tube 12 is sealed so as to form a communication hole 26 for communicating the internal space 24 of the light-emitting tube 12 with the outside, as shown in fig. 5, instead of being completely sealed. This can be performed, for example, by using a clamp member 50 as shown in fig. 6 and 7, in which the clamp member 50 is formed by forming a recess 54 in a part of a pressing surface 52 that presses and seals an end portion of the light-emitting tube 12. Of course, it is conceivable to form the seal portions 22 having the communication holes 26 first, and to form the pair of seal portions 22 substantially simultaneously.

The position of formation of the communication hole 26 may be any position in the width direction of the sealing portion 22 (the radial direction of the light-emitting tube 12 (vertical direction in fig. 2)), but is preferably formed at an end portion in the width direction of the sealing portion 22 (the end portion in the radial direction of the light-emitting tube 12) as shown in fig. 2. The reason for this is that the end portion in the width direction of the sealing portion 22 is originally a portion where airtightness is difficult to achieve due to the problem of the thickness of the arc tube 12, so that it is rather easy to form the communication hole 26, and further, if the communication hole 26 is formed in the vicinity of the center portion in the width direction of the sealing portion 22, airtightness of the end portion in the width direction of the sealing portion 22 becomes more difficult.

After the communication hole 26 is formed, as shown in fig. 8, a tubular exhaust pipe 60 is attached to the outer end of the communication hole 26 (the sealing portion 22 side of the light-emitting tube 12) by welding or the like.

Then, the exhaust gas is discharged from the internal space 24 of the arc tube 12 through the exhaust pipe 60, and the sealed material is sealed in the internal space 24. As described above, the enclosed material may be mercury 25 and halogen (iodine, bromine, or a mixture of iodine and bromine). Of course, an appropriate enclosure is selected according to the type of the lamp 10.

Finally, as shown in fig. 1, the root of the exhaust pipe 60 is heated and melted to form the tip portion 28 that closes the communication hole 26. The tip portion 28 is formed at the outer end of the communication hole 26, that is, the outer end of the sealing portion 22 where the communication hole 26 is formed. Thereby, the communication hole 26 and the internal space 24 are airtight to the outside, and the lamp 10 is completed.

When a predetermined high voltage is applied to the pair of lead bars 18 provided in the lamp 10, the glow discharge that starts between the pair of electrodes 14 disposed in the internal space 24 of the light-emitting portion 20 is transferred to the arc discharge, and light (mainly ultraviolet rays) is emitted by the mercury 25 evaporated and excited by the arc.

(features of the lamp 10)

According to the sealing structure and the sealing method of the lamp 10 to which the present invention is applied, the tip portion 28 that closes the internal space 24 of the light-emitting tube 12 is formed at the outer end of the sealing portion 22 that is apart from the internal space 24. Since the outer end of the sealing portion 22 is at a relatively low temperature (for example, 300 ℃ or lower) even during the light emission of the lamp 10, the possibility that the structural destruction of the quartz glass progresses during the light emission of the lamp 10 and the light-emitting tube 12 is damaged from the tip portion 28 can be reduced.

Further, since the tip end 28 formed at the outer end of the sealing portion 22 is not easily irradiated with light emitted from the internal space 24 of the arc tube 12, the structural destruction of the quartz glass is not remarkably increased even when ultraviolet rays having a wavelength of 200nm or less are emitted depending on the type of the lamp 10.

Further, since the light emitted from the inner space 24 of the light-emitting tube 12 is less likely to be irradiated to the tip portion 28, it is possible to reduce the possibility that the light emitted from the lamp 10 is blocked by the tip portion 28 and uneven illuminance is generated on the irradiation target irradiated with the lamp 10.

(modification 1)

In the lamp 10 according to the above embodiment, the communication hole 26 is formed in at least one sealing portion 22, and the exhaust pipe 60 is connected to the outer end of the communication hole 26, but instead of this, the exhaust pipe 60 may be embedded in at least one sealing portion 22 as shown in fig. 9 and 10. In this case, it is preferable to use the same quartz glass as the arc tube 12 as the material of the exhaust pipe 60.

With regard to the lamp 10 according to modification 1, the same configuration as that of the lamp 10 according to the above-described embodiment will be referred to, and only the different configuration will be described with reference to the description of the lamp 10.

In at least 1 of the sealed portions 22 in the lamp 10 according to modification 1, an exhaust pipe 60 for communicating the internal space 24 of the arc tube 12 with the outside is embedded, and a tip portion for closing the exhaust pipe 60 is formed at an outer end of the exhaust pipe 60 (that is, an outer end of the sealed portion 22).

Next, a manufacturing process of the lamp 10 according to modification 1 will be described. In the description of the manufacturing process, the same process as that of the lamp 10 according to the above embodiment is referred to, and only a different process will be described with reference to the description of the lamp 10.

When at least 1 sealing portion 22 is formed, as shown in fig. 11 to 13, the mounting portion 30 and the exhaust pipe 60 are inserted into the end portion of the light-emitting tube 12, and the end portion is sealed by shrinkage. Thereby, the internal space 24 of the arc tube 12 is in a state of communication with the outside through the exhaust pipe 60 embedded in the sealing portion 22.

Then, the inside space 24 of the light-emitting tube 12 is exhausted through the exhaust pipe 60, and the sealed material is sealed in the inside space 24. As described above, the enclosed material may be mercury 25 and halogen (iodine, bromine, or a mixture of iodine and bromine). Of course, an appropriate enclosure is selected according to the type of the lamp 10.

Finally, the exhaust pipe 60 is heated and melted at the position of the outer end of the sealing portion 22 to form the tip end portion 28 that closes the exhaust pipe 60. Thereby, the exhaust pipe 60 and the internal space 24 are airtight to the outside, and the lamp 10 is completed (see fig. 9 and 10).

(modification 2)

In the case of the lamp 10 (lamp 10 having the communication hole 26) according to the above-described embodiment, after the lamp 10 is manufactured, the communication hole 26 may be heated from the outside to close the communication hole 26. This concentrates the enclosed materials (for example, mercury and halide) of the lamp 10 in the relatively low temperature communication hole 26, thereby preventing the light emission amount of the lamp 10 from decreasing or preventing the halogen cycle from being blocked.

As a method of closing the communication hole 26, the entire communication hole 26 may be closed (see fig. 14), or only an end portion of the communication hole 26 closer to the internal space 24 of the arc tube 12 may be closed (see fig. 15).

(modification 3)

Although the discharge lamp is configured as the lamp 10 in the above embodiment, the lamp 10 is not limited to the discharge lamp, and may be a halogen lamp as shown in fig. 16, a single electrode dielectric barrier discharge lamp, or an electrodeless discharge lamp. Further, it may be a dielectric barrier discharge lamp. That is, the present invention can be applied to any lamp having at least 1 sealing portion and having a gas sealed in a sealed inner space, regardless of the presence or absence of an electrode.

In this manner, at least 1 sealing portion 22 may be formed in the lamp 10, and conversely, the communicating hole 26 and the pointed end portion 28 may be formed on both sides of the pair of sealing portions 22, or not only the exhaust pipe 60 but also the pointed end portion 28 may be embedded. The mounting portion 30 (the electrode 14, the foil 16, and the lead bar 18) is not an essential component.

The shape of the light-emitting tube 12 (particularly, the light-emitting portion 20) is not limited to the shape having a circular cross section as in the above-described embodiment, and may be, for example, an oval cross section or a rectangular cross section.

The embodiments disclosed herein are illustrative in all respects and not restrictive. The scope of the present invention is defined not by the above description but by the claims, and is intended to include all modifications within the scope and meaning equivalent to the claims.

(description of reference numerals)

10 lamp, 12 luminous tube, 14 electrode, 16 foil, 18 leading bar, 20 luminous part, 22 sealing part, 24 internal space, 25 mercury, 26 communication hole, 28 tip part and 30 assembling part

50 clamping member, 52 pressing surface, 54 recess

60 exhaust pipe.

Claims

1. A sealed structure of a lamp includes a light emitting tube having an airtight internal space and at least 1 sealing portion,

a communication hole for communicating the internal space with the outside is provided in the sealing portion,

a tip portion for closing the communication hole is formed at an outer end of the communication hole.

2. A sealed structure of a lamp includes a light emitting tube having an airtight internal space and at least 1 sealing portion,

an exhaust pipe for communicating the internal space with the outside is embedded in the sealing portion,

a tip portion that closes the exhaust pipe is formed at an outer end of the exhaust pipe.

3. A lamp comprising the sealing structure of the lamp according to claim 1 or 2.

4. A method of sealing a lamp, wherein at least 1 end portion of a light-emitting tube is sealed to form an airtight internal space within the light-emitting tube,

the lamp sealing method comprises the following steps:

forming a communication hole for communicating the inner space with the outside when the end portion is sealed to form a sealing portion at the light emitting tube,

an exhaust pipe is attached to an outer end of the communication hole, and the exhaust pipe is used for exhausting air from the internal space and sealing the sealed object into the internal space,

and the root of the exhaust pipe is heated and melted to form a tip part which closes the communicating hole.

5. A method of sealing a lamp, wherein at least 1 end portion of a light-emitting tube is sealed to form an airtight internal space within the light-emitting tube,

the lamp sealing method comprises the following steps:

a sealing portion formed by sealing the end portion with an exhaust pipe inserted in the end portion, the internal space being in communication with the outside via the exhaust pipe embedded in the sealing portion,

exhausting gas from the internal space through the exhaust pipe and enclosing an enclosure in the internal space,

and heating and melting the exhaust pipe at an outer end of the sealing portion to form a tip end portion closing the exhaust pipe.