JP2022061375A - Structure for sealing lamp, lamp, and method for sealing lamp - Google Patents

Abstract

To provide a structure for sealing a lamp, which hardly causes damage to a luminous tube and which hardly causes illuminance unevenness.SOLUTION: A structure for sealing a lamp 10, which comprises a luminous tube 12 having an airtight internal space 24 and at least one sealing part 22, is constituted as follows: the sealing part 22 is provided with a communication hole 26 for communicating the internal space 24 with the outside; and a chip part 28 for closing the communication hole 26 is formed at the outside end of the communication hole 26.SELECTED DRAWING: Figure 1

Description

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

Conventionally, widely used gas-filled lamps form a sealed space inside the arc tube by sealing both ends or one end of the arc tube (glass container) by a pinch seal method. There is.

Examples of the gas-containing lamp include a halogen lamp used for heating and the like, a metal halide lamp used for lighting and the like, an ultraviolet lamp for ultraviolet cleaning, a discharge lamp and the like. (Note that 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 inserting a pair of mount portions 2 and sealing both ends of the arc tube 3 by a pinch seal method, an impurity removal step such as heat treatment is performed, and then FIG. 18 shows. As shown, the heat is exhausted through the exhaust pipe 5 attached to the arc tube 3 so as to communicate with the internal space 4 in advance. After that, the necessary inclusions are put into the internal space 4, the internal space 4 is put into a negative pressure state, and then the exhaust pipe 5 is heated and melted to seal the internal space 4 and the exhaust pipe 5 is removed. The discharge lamp 1 is formed.

It should be noted that a discharge lamp that generates a discharge between a pair of electrodes in the internal space of the arc lamp and uses light emission by mercury, a light emitting metal that uses light emission, or an inner surface of the arc tube during lighting. When a halide is sealed in the internal space for the purpose of preventing blackening, it is necessary to put the necessary inclusions in the internal space before exhausting through the exhaust pipe.

Japanese Unexamined Patent Publication No. 2000-306547

In the case of the conventional gas-filled lamp 1, as shown in FIG. 17, after sealing the internal space 4, the “chip portion 6” which is an airtight processing mark is formed on the surface of the arc tube 3 facing the internal space 4. This chip portion 6 is the weakest in terms of strength because it is a place where stress generated in the arc tube 3 is concentrated, and when the lamp 1 is made to emit light, the temperature rises from 700 ° C to 900 ° C to the arc tube 3. Since the structural destruction of quartz glass (SiO ₂ ), which is the material of the above, progresses, there is a problem that the arc tube 3 is easily damaged from the chip portion 6.

Furthermore, there is also a problem that when the chip portion 6 receives ultraviolet rays having a wavelength of 200 nm or less depending on the type of the lamp 1, the progress of structural destruction of the quartz glass becomes more remarkable.

Further, since the chip portion 6 is located at a position facing the internal space 4 provided with a light emitting portion such as an electrode, the light beam emitted from the lamp 1 is blocked by the chip portion 6 and the irradiation illuminated by the lamp 1. There was also a problem that uneven illumination occurred in the subject.

The present invention has been made in view of the above-mentioned problems, and an object thereof is a lamp sealing structure, a lamp, and a lamp sealing method in which the arc tube is less likely to be damaged and the illuminance unevenness is less likely to occur. Is to provide.

According to one aspect of the invention
A lamp encapsulation structure comprising an airtight interior space and an arc tube having at least one encapsulation.
The sealing portion is provided with a communication hole that communicates the internal space with the outside.
A lamp sealing structure is provided in which a tip portion for closing the communication hole is formed at the outer end of the communication hole.

According to other aspects of the invention
A lamp encapsulation structure comprising an airtight interior space and an arc tube having at least one encapsulation.
An exhaust pipe that communicates the internal space with the outside is embedded in the sealing portion.
A lamp sealing structure is provided at the outer end of the exhaust pipe, in which a tip portion for closing the exhaust pipe is formed.

According to another aspect of the invention
A lamp having any of the sealing structures described above is provided.

According to yet another aspect of the invention.
A lamp sealing method that seals at least one end of an arc tube to form an airtight internal space inside the arc tube.
When the end portion is sealed to form a sealing portion in the arc tube, a communication hole for communicating the internal space and the outside is formed.
An exhaust pipe is attached to the outer end of the communication hole, and exhaust from the internal space and encapsulation of the enclosed material in the internal space are performed through the exhaust pipe.
Provided is a method for sealing a lamp, which heats and melts the root of the exhaust pipe to form a chip portion that closes the communication hole.

According to yet another aspect of the invention.
A lamp sealing method that seals at least one end of an arc tube to form an airtight internal space inside the arc tube.
With the exhaust pipe inserted in the end portion, the end portion is sealed to form a sealing portion, and the internal space and the outside communicate with each other via the exhaust pipe embedded in the sealing portion. To be in a state of
Exhaust from the internal space and encapsulation of the enclosed material in the internal space are performed through the exhaust pipe.
Provided is a lamp sealing method in which an exhaust pipe is heated and melted at an outer end portion of the sealing portion to form a chip portion that closes the exhaust pipe.

According to the sealing structure and sealing method of the lamp according to the present invention, the chip portion that seals and closes the internal space of the arc tube is formed at the outer end of the sealing portion separated from the internal space. Since the outer end of the sealing portion has a relatively low temperature (for example, 300 ° C. or lower) even when the lamp is emitting light, the structural destruction of the quartz glass progresses during the emission of the lamp, and the arc tube from the chip portion. Can be reduced from being damaged.

Further, since the chip portion formed at the outer end of the sealing portion is difficult to be exposed to the light emitted from the internal space of the arc tube, even when ultraviolet rays having a wavelength of 200 nm or less are emitted depending on the type of lamp. The progress of structural destruction of quartz glass is not remarkable.

Furthermore, since the light emitted from the internal space of the arc tube is difficult to hit the chip portion, the light beam emitted from the lamp is blocked by the chip portion, reducing the possibility of uneven illuminance in the irradiation target illuminated by the lamp. can.

It is a figure which shows the lamp 10 to which this invention was applied. It is the end view of the line AA. It is a figure which shows the manufacturing procedure of the lamp 10 to which this invention was applied. It is a figure which shows the manufacturing procedure of the lamp 10 to which this invention was applied. It is a figure which shows the manufacturing procedure of the lamp 10 to which this invention was applied. It is a figure which shows the state which the end portion of the arc tube 12 is pinch-sealed in the manufacturing procedure of a lamp 10. It is a figure which shows the state which the end portion of the arc tube 12 is pinch-sealed in the manufacturing procedure of a lamp 10. It is a figure which shows the manufacturing procedure of the lamp 10 to which this invention was applied. It is a figure which shows the lamp 10 which concerns on modification 1. FIG. It is a BB line end view. It is a figure which shows the manufacturing procedure of the lamp 10 which concerns on modification 1. FIG. It is a figure which shows the state of pinch-sealing the end portion of the arc tube 12 in the manufacturing procedure of the lamp 10 which concerns on modification 1. FIG. It is a figure which shows the state of pinch-sealing the end portion of the arc tube 12 in the manufacturing procedure of the lamp 10 which concerns on modification 1. FIG. It is a figure which shows the lamp 10 which concerns on the modification 2. It is a figure which shows the lamp 10 which concerns on the modification 2. It is a figure which shows the halogen lamp to which this invention was applied. It is a figure which shows the conventional gas-filled lamp 1. It is a figure explaining the manufacturing procedure of the conventional gas-filled lamp 1.

(Structure of lamp 10)
The structure of the lamp 10 according to an example to which the present invention is applied will be described with reference to FIGS. 1 and 2. The lamp 10 is a discharge lamp, and is generally composed of an arc tube 12, a pair of electrodes 14, a pair of foils 16, and a pair of lead rods 18.

The arc tube 12 is made of, for example, quartz glass, and has 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 a pair of sealing portions 22 is formed in the light emitting portion 20.

Further, a predetermined amount of mercury 25 and a halogen (iodine, bromine, or a mixture of iodine and bromine) are enclosed in the internal space 24 of the light emitting unit 20.

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

Further, the pair of lead rods 18 are substantially rod-shaped members made of molybdenum, and one end of each is electrically connected to the other end of each foil 16. Further, the other ends of the pair of lead rods 18 extend outward from each sealing portion 22.

Explaining the structure of the sealing portion 22, one sealing portion 22 is provided with a communication hole 26 for communicating the internal space 24 of the arc tube 12 with the outside.

Further, a tip portion 28 that closes the communication hole 26 is formed at the outer end of the communication hole 26, that is, at the outer end of the sealing portion 22 in which the communication hole 26 is formed. The communication hole 26 and the internal space 24 are airtight from the outside by the chip portion 28.

(Manufacturing procedure of lamp 10)
Next, the manufacturing procedure of the lamp 10 described above will be described. First, as shown in FIG. 3, the arc tube 12 before sealing is prepared. Further, the electrode 14 and the lead rod 18 are attached to the foil 16 by means such as welding to form a pair of mount portions 30.

After that, the mount portion 30 was inserted from the electrode 14 into the end portion of the arc tube 12, and one of the arc tubes 12 (the mount portion 30 was inserted) while holding the mount portion 30 at a predetermined position. Seal by pinch-sealing the (side) end. As a result, as shown in FIG. 4, one sealing portion 22 is formed.

Next, the other mount portion 30 is inserted into the other end portion of the arc tube 12, and the other end portion is pinch-sealed. As a result, the internal space 24 is formed in the substantially central portion of the arc tube 12. At this time, instead of completely sealing, as shown in FIG. 5, the other end of the arc tube 12 is formed so that a communication hole 26 that communicates the internal space 24 of the arc tube 12 with the outside is formed. Seal the part. This is done, for example, by using a pinch member 50 in which a recess 54 is formed in a part of a pressing surface 52 that presses and seals the end portion of the arc tube 12, as shown in FIGS. 6 and 7. can. Of course, the sealing portion 22 having the communication holes 26 may be formed first, or the pair of sealing portions 22 may be formed at almost the same time.

The communication hole 26 may be formed at any position in the width direction of the sealing portion 22 (the radial direction of the arc tube 12 (= the vertical direction in FIG. 2)), but is shown in FIG. As described above, it is preferable to form the sealing portion 22 at the widthwise end portion (the radial end portion of the arc tube 12). The reason is that the end portion in the width direction of the sealing portion 22 is a portion where airtightness is difficult due to the problem of the wall thickness of the arc tube 12, so that it is relatively easy to form the communication hole 26. Further, if the communication hole 26 is formed near the center portion in the width direction of the sealing portion 22, it becomes more difficult to airtight the end portion in the width direction of the sealing portion 22.

After the communication hole 26 is formed, as shown in FIG. 8, a pipe-shaped exhaust pipe 60 is attached to the outer end of the communication hole 26 (the end of the sealing portion 22 in the arc tube 12) by means such as welding.

Then, the exhaust from the internal space 24 of the arc tube 12 and the encapsulation of the enclosed material in the internal space 24 are performed through the exhaust pipe 60. As the inclusion, mercury 25 and a halogen (iodine, bromine, or a mixture of iodine and bromine) can be considered as described above. Of course, an appropriate inclusion 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 a chip 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, at the outer end of the sealing portion 22 in which the communication hole 26 is formed. As a result, the communication hole 26 and the internal space 24 are airtight from the outside, and the lamp 10 is completed.

When a predetermined high voltage is applied to the pair of lead rods 18 provided in the lamp 10, the glow discharge started between the pair of electrodes 14 arranged in the internal space 24 of the light emitting unit 20 shifts to an arc discharge. Light (mainly ultraviolet light) is emitted by the mercury 25 evaporated and excited by the arc.

(Characteristics of lamp 10)
According to the sealing structure and sealing method of the lamp 10 to which the present invention is applied, the chip portion 28 that seals and closes the internal space 24 of the arc tube 12 is separated from the internal space 24, and the outside of the sealing portion 22. Formed on the edge. Since the outer end of the sealing portion 22 has a relatively low temperature (for example, 300 ° C. or lower) even when the lamp 10 is emitting light, the structure of the quartz glass is destroyed during the light emission of the lamp 10, and the chip portion is formed. From 28, the possibility that the arc tube 12 is damaged can be reduced.

Further, since the chip portion 28 formed at the outer end of the sealing portion 22 is difficult to be exposed to the light emitted from the internal space 24 of the arc tube 12, ultraviolet rays having a wavelength of 200 nm or less are emitted depending on the type of the lamp 10. Even in this case, the progress of structural destruction of the quartz glass is not remarkable.

Further, since the light emitted from the internal space 24 of the arc tube 12 is difficult to hit the chip portion 28, the light rays emitted from the lamp 10 are blocked by the chip portion 28, and the illuminance unevenness in the irradiation target illuminated by the lamp 10 Can be reduced.

(Modification 1)
In the lamp 10 according to the above-described embodiment, the communication hole 26 is formed in at least one of the sealing portions 22, and the exhaust pipe 60 is connected to the outer end of the communication hole 26. , 9 and 10, the exhaust pipe 60 may be embedded in at least one sealing portion 22. 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.

Regarding the lamp 10 according to the modification 1, the same configuration as the lamp 10 according to the above-described embodiment will be referred to, and only the different configurations will be described.

An exhaust pipe 60 that communicates the internal space 24 of the arc tube 12 with the outside is embedded in at least one sealing portion 22 of the lamp 10 according to the first modification, and the outer end of the exhaust pipe 60 (that is, that is). A tip portion that closes the exhaust pipe 60 is formed at the outer end of the sealing portion 22).

Next, the manufacturing procedure of the lamp 10 according to the first modification will be described. Also in the description of this manufacturing procedure, the description of the lamp 10 will be referred to for the same procedure as the lamp 10 according to the above-described embodiment, and only the different procedure will be described.

When forming at least one sealing portion 22, as shown in FIGS. 11 to 13, the mount portion 30 and the exhaust pipe 60 are inserted into the end portion of the arc tube 12, and the end portion is pinch-sealed. As a result, the internal space 24 of the arc tube 12 and the outside communicate with each other via the exhaust pipe 60 embedded in the sealing portion 22.

After that, the exhaust from the internal space 24 of the arc tube 12 and the encapsulation of the enclosed material in the internal space 24 are performed via the exhaust pipe 60. As the inclusion, mercury 25 and a halogen (iodine, bromine, or a mixture of iodine and bromine) can be considered as described above. Of course, an appropriate inclusion 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 a chip portion 28 that closes the exhaust pipe 60. As a result, the exhaust pipe 60 and the internal space 24 are airtight from the outside, and the lamp 10 is completed (see FIGS. 9 and 10).

(Modification 2)
Further, in the case of the lamp 10 (the lamp 10 having the communication hole 26) according to the above-described embodiment, the communication hole 26 may be further heated from the outside to close the communication hole 26 after the production of the lamp 10 is completed. .. This prevents the inclusions (for example, mercury and halides) of the lamp 10 from gathering in the communication hole 26 at a relatively low temperature, reducing the light emission amount of the lamp 10 and hindering the halogen cycle. can.

As a method of closing the communication hole 26, the entire communication hole 26 may be closed (see FIG. 14), or only the end of the communication hole 26 near the internal space 24 of the arc tube 12 may be closed (FIG. 15). reference).

(Modification 3)
In the above-described embodiment, the case where the discharge lamp is configured as the lamp 10 has been described, but the lamp 10 is not limited to the discharge lamp, and may be a halogen lamp as shown in FIG. 16 or a single electrode. It may be a dielectric barrier discharge lamp or an electrodeless discharge lamp. Furthermore, it may be a dielectric barrier discharge lamp. That is, the present invention can be applied to a lamp that has at least one sealing portion regardless of the presence or absence of an electrode and that encloses a gas body in the sealed internal space.

As described above, the lamp 10 may be configured with at least one sealing portion 22, and conversely, the communication hole 26 and the chip portion 28 are formed in both of the pair of sealing portions 22, or the exhaust gas is exhausted. The pipe 60 may be embedded and the chip portion 28 may be formed. Further, the mount portion 30 (electrode 14, foil 16, and lead rod 18) is not an essential component.

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

The embodiments disclosed this time should be considered to be exemplary and not restrictive in all respects. The scope of the present invention is shown by the scope of claims, not the description described above, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

10 ... lamp, 12 ... arc tube, 14 ... electrode, 16 ... foil, 18 ... lead rod, 20 ... light emitting part, 22 ... sealing part, 24 ... internal space, 25 ... mercury, 26 ... communication hole, 28 ... chip Part, 30 ... Mount part 50 ... Pinch member, 52 ... Pressing surface, 54 ... Recess 60 ... Exhaust pipe

Claims (5)

A lamp encapsulation structure comprising an airtight interior space and an arc tube having at least one encapsulation.
The sealing portion is provided with a communication hole that communicates the internal space with the outside.
A lamp sealing structure in which a chip portion that closes the communication hole is formed at the outer end of the communication hole. A lamp encapsulation structure comprising an airtight interior space and an arc tube having at least one encapsulation.
An exhaust pipe that communicates the internal space with the outside is embedded in the sealing portion.
A lamp sealing structure in which a tip portion for closing the exhaust pipe is formed at the outer end of the exhaust pipe. A lamp having the sealing structure according to claim 1 or 2. A lamp sealing method that seals at least one end of an arc tube to form an airtight internal space inside the arc tube.
When the end portion is sealed to form a sealing portion in the arc tube, a communication hole for communicating the internal space and the outside is formed.
An exhaust pipe is attached to the outer end of the communication hole, and exhaust from the internal space and encapsulation of the enclosed material in the internal space are performed through the exhaust pipe.
A method for sealing a lamp, which heats and melts the base of the exhaust pipe to form a chip portion that closes the communication hole. A lamp sealing method that seals at least one end of an arc tube to form an airtight internal space inside the arc tube.
With the exhaust pipe inserted in the end portion, the end portion is sealed to form a sealing portion, and the internal space and the outside communicate with each other via the exhaust pipe embedded in the sealing portion. To be in a state of
Exhaust from the internal space and encapsulation of the enclosed material in the internal space are performed through the exhaust pipe.
A lamp sealing method for forming a chip portion that closes the exhaust pipe by heating and melting the exhaust pipe at the outer end portion of the sealing portion.

Images