JPH0350608Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a high-pressure discharge lamp, and more specifically, to a high-pressure discharge lamp for large currents,
The present invention relates to a high-pressure discharge lamp characterized by its hermetically sealed structure.

[Conventional technology]

2. Description of the Related Art High-pressure discharge lamps, such as mercury lamps, are generally widely used in fields that utilize ultraviolet rays emitted from the lamps, such as the photochemical industry, semiconductor device manufacturing, and other fields.

For example, in high-pressure or ultra-high-pressure mercury lamps for large currents, the amount of mercury that is the main component of the luminescent gas is large, so the gas pressure inside the bulb when lit is extremely high, and the amount of heat generated is large. The glass of the stop part is required to have high heat resistance. It is necessary that the mercury in the enclosure be completely evaporated during lighting, and therefore it is necessary that there be no low-temperature areas where mercury would condense within the enclosure during lighting.

For this reason, conventional high-pressure or ultra-high-pressure mercury lamps do not use the so-called rod seal structure, in which the glass that forms the bulb's enclosure is directly welded to the power supply lead rod for an airtight seal. A so-called foil seal structure using metal foil is adopted.

Specifically, on the outer periphery of the bottomed cylindrical glass member 1A as shown in FIG. For example, four strip-shaped metal foils 2A are arranged, one end side 21A of each of these metal foils 2A is bent at the bottom edge 11A of the glass member 1A, and this is arranged so as to protrude from the bottom end surface 12A. It is connected to the base end 31A of the lead rod 3A, and the other end side 2 of each metal foil 2A is connected to the base end 31A of the lead rod 3A.
2A is bent at the open end edge 13A of the glass member 1A and connected to the outer periphery of an external lead rod 4A inserted and held in the cylindrical hole of the glass member 1A to form a conductive part 5A for sealing. 6A is an electrode fixed to the tip of the internal lead rod 3A, and 7A is a cylindrical glass piece for holding the internal lead rod.

Next, such a conductive part 5A for sealing is placed in a second
As shown in FIG.
Insert and arrange it so that it is located within 2. Then, the sealed tube portion 81A is heat-treated from the outside and the sealed tube portion 81A is heated.
The inner periphery of the glass member 1A and the outer periphery of the glass member 1A are covered with metal foil 2.
Weld it airtight through A. On the proximal end side of the internal lead rod 3A, a sealed tube portion 81A is provided.
The part of the glass facing the glass piece 7A is heated and pressed, or negative pressure is applied inside the sealed tube part 81A, and the negative pressure is used to weld the glass piece 7A to the narrowed part 9A as shown in FIG. At the outer end of the sealed tube portion 81A, the exposed portion of the metal foil 2A is covered with glass by heating and melting the glass at the outer end. In the other sealed tube portion 81B, a sealing conductive portion 5B having the same structure as the sealing conductive portion 5A is connected in the same manner as described above, thereby constructing a high-pressure mercury lamp as shown in FIG.

[Problem that the invention attempts to solve]

However, in the high-pressure mercury lamp configured as described above, in the process of connecting the sealing conductive parts 5A, 5B, the inner circumferences of the sealing tube parts 81A, 81B and the outer circumferences of the glass members 1A, 1B are connected with metal foils 2A, 2B. When welding through the glass members 1A, 1B, the bent portions 23A, 23B of the metal foils 2A, 2B bent at the bottom edges 11A, 11B and their surroundings are deformed, so wrinkles are likely to occur. The bottom parts 15A, 15B of the members 1A, 1B and the sealing tube parts 81A, 81B are welded together so that there is no gap where mercury can enter and condense during lighting.
The glass in the sealed tube portions 81A, 81B is heated from the outer periphery and pressed from the outside with a relatively strong force, or negative pressure is applied inside the sealed tube portions 81A, 81B, and this negative pressure is used to cool the bottom end surfaces 12A, 12, so to speak.
It is necessary to crush the space facing B, and for this reason, the wrinkles generated in the bent portions 23A, 23B come into close contact with the glass of the sealed tube portions 81A, 81B, and therefore, during lighting. , since the bottom parts 15A and 15B communicate with the light emitting space and become quite high temperature, and the pressure inside the enclosure 8 is quite high, for example, 20 atmospheres or more, the bent parts 23A,
There is a problem in that the glass that comes into contact with the wrinkles formed on 23B is likely to be distorted, and this distortion may cause a crack, leading to a dangerous accident in which the high-pressure mercury lamp explodes in the worst case.

For this reason, the inventor of the present invention first proposed the
In No. 59-115961, the authors proposed a technique for making the ridgeline of the bottom edge of a glass member straight, and clarified that the above-mentioned problems could be solved by such a technique.

However, a new problem was discovered here.

That is, if it is necessary to have four or more metal foils 2A or 2B, the metal foils 2A or 2B must be
One end side 21A or 21B of B is likely to be airtightly welded while overlapping each other, and in this case, the bottom end surfaces 12A, 1 of the glass members 1A, 1B
Since the narrow parts 9A and 9B are formed along the metal foil 2B, the overlapping parts of the metal foil 2A or 2B are forcibly deformed and become complicated shapes, and therefore the narrow parts 9A contacting the overlapping parts. , 9B tends to be distorted, and the one end side 2
The parts where 1A and 21B are located are close to the light emitting space, so the temperature is quite high, and the pressure inside the enclosure 8 is quite high during lighting. It has been found that cracks may occur in the glass portions of portions 81A and 81B, which may cause an extremely dangerous accident in which the enclosure explodes.

In other words, in a large-current high-pressure discharge lamp where there are four or more metal foils 2A or 2B, if any of the metal foils has wrinkles, so-called foil breakage will occur in this area. in case of,
The current will concentrate and flow through other metal foils,
This triggers an explosion. However,
An explosion accident caused by a high-pressure discharge lamp can cause great damage to surrounding equipment and is extremely dangerous.
This is something that must be avoided at all costs.

[Purpose of invention]

The present invention was developed based on the above-mentioned circumstances, and its purpose is to reliably suppress the occurrence of distortion in the glass portion of the sealed tube, thereby preventing the occurrence of explosion accidents of the sealed tube. The object of the present invention is to provide a high-pressure discharge lamp that can be lit extremely safely and has a long service life.

[Means for solving problems]

The high-pressure discharge lamp of the present invention includes a glass enclosure consisting of a light-emitting space surrounding section and a sealed tube section following the glass enclosure, and is arranged inside the sealed tube section so that its open end faces toward the outer end of the sealed tube section. a bottomed cylindrical glass member; an external lead rod inserted into a cylindrical hole of the glass member; and an internal lead rod arranged to extend from a bottom end surface of the glass member into the light emitting space surrounding portion; The electrode provided at the tip of the internal lead rod extends along the outer periphery of the glass member, one end of which is bent at the ridgeline of the bottom edge of the glass member and connected to the internal lead rod, and the other end thereof is connected to the internal lead rod. 4 bent at the ridgeline of the edge of the opening end of the glass member and connected to the external lead rod, each of which is spaced apart in the circumferential direction of the glass member.
the ridgeline of the bottom edge of the glass member is linear, and the outer periphery of the glass member and the inner periphery of the sealed tube portion are airtightly connected via the metal foil. A high-pressure discharge lamp in which the inside of the enclosure is hermetically sealed by welding, and the sealed tube portion of the enclosure has a constriction on the side surrounding the light emitting space along the bottom end surface of the glass member. The other end of the metal foil located on the bottom end surface of the glass member has a tapered trapezoidal shape in which both corners of a rectangle are obliquely cut. It is characterized in that the tips of adjacent metal foils do not overlap with each other.

According to this configuration, even if there are four or more metal foils, the tips of the metal foils located on the bottom end surface of the glass member have a rectangular shape with both corners cut off diagonally. Since the tips of adjacent metal foils do not overlap with each other due to the tapered trapezoidal shape, the one end side of each metal foil is spaced apart from each other and comes into close contact with the bottom end surface of the glass member in a substantially flat state. The sides are not subjected to excessive deformation, and therefore, when the one end sides of the metal foils are overlapped, the glass portion of the sealed tube portion that comes into contact with the overlapped portion is not likely to be distorted. Moreover, since the ridge line at the bottom edge of the glass member is straight, the bent part of the metal foil can be brought into close contact with the ridge line, and wrinkles will not occur in the bent part and its surroundings. This prevents distortion from occurring in the sealed tube section. As a result of the above, it is possible to obtain a light bulb that uses a relatively wide metal foil to obtain a large current capacity, can be extremely safely lit without causing an explosion accident, and has a long service life.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings regarding the construction of a high-pressure mercury lamp.

In one embodiment of the present invention, as shown in FIGS.
In each of 02A, the glass member 10A is formed into an octagonal tube shape, for example, so that ridgelines 103A and 104A on which bent portions 23A and 23B of a metal foil 2A to be described later are located are linear. The width of each of the four flat surfaces 105A on the outer periphery of the octagonal cylindrical glass member 10A is equal to or larger than the width of the metal foil 2A. Next, as shown in FIG. Four metal foils 2A made of molybdenum, for example, each having a tapered trapezoidal shape, each having a notch 27A formed by cutting both corners diagonally, are placed on one end side 21A.
The base end 3 of the internal lead rod 3A is connected to the four sides of the connecting member 28A in a spaced apart state so as not to overlap with each other, and the base end 3 of the internal lead rod 3A is connected to the center of the connecting member 28A.
1A, and one end side 21 of each metal foil 2A.
A is bent at the linear ridgeline 103A of the bottom edge 101A of the glass member 10A, and these bent portions 23A are brought into close contact with the ridgeline 103A, and the connecting member 28A is brought into close contact with the bottom end surface 106A of the glass member 10A to connect the inside. The lead rod 3A is arranged so as to protrude and extend from the bottom end surface 106A. Then each metal foil 2A is attached to a glass member 1.
The other end 22A is bent at the linear ridge line 104A of the opening end edge 102A of the glass member 10A to bring the bent portion 24A into close contact with the glass member 10A. The end 26A is attached to the glass member 10
The electrically conductive part 50A for sealing is connected to the outer periphery of the external lead rod 4A inserted and held in the cylinder of A.
6A is an electrode fixedly provided at the tip of the internal lead rod 3A, and 7A is a cylindrical glass piece for holding the internal lead rod.

Next, such a conductive part 50A for sealing is placed in the first
As shown in the figure, the electrode 6A is inserted into the sealed tube portion 81A of the quartz glass envelope 8 so as to be located within the light emitting space surrounding portion 82 of the envelope 8. Then, heat treatment is performed from the outside of the sealed tube portion 81A to airtightly weld the inner periphery of the sealed tube portion 81A and the outer periphery of the glass member 10A via the metal foil 2A. On the proximal end side of the internal lead rod 3A, the glass in the portion of the sealed tube portion 81A facing the glass piece 7A is heated and pressed from the outside, or the sealed tube portion 8
Negative pressure is applied inside 1A, and the negative pressure causes the glass piece 7A to be welded to form a narrowed portion 9A (see Fig. 1, G). By heating and melting the glass, the exposed portion of the metal foil 2A is covered with glass.

In the other sealed tube part 81B, a conductive part 50B for sealing, which is constructed in the same manner as the conductive part 50A for sealing, is constructed in the same manner as described above, thereby constructing a high-pressure mercury lamp as shown in FIG.

In a specific example, the power consumption is 2KW (current: about 60A, voltage: about 35V), the mercury vapor pressure inside the envelope when lit is about 30 atmospheres, the width of the metal foils 2A and 2B is 6 to 15 mm, Length 30~50mm, thickness 30~50μm
It is.

One end side 21A, 21B of the metal foil 2A, 2B
In the notches 27A and 27B, if the opening angle α (see FIG. 1 D) of both side edges is approximately 30 to 100 degrees, it is possible to arrange the notches 27A and 27B on one end side reliably so that they do not overlap. . This notch 2
7A, 27B may be easily formed by cutting and removing the corner portions of a band-shaped metal foil, for example, but by cutting the corner portions in this way, the cutout portions 27A, 2
7B, the corresponding notches 27A, 27
Burrs are likely to form on the cut ends 29A and 29B of B, and these burrs may cause distortion in the glass portions of the sealed tube portions 81A and 81B. As shown, it is preferable that the cuts 29A and 29B have smooth curved surfaces. Specifically, after forming the notches 27A, 27B, the cut portions 29A, 29B are electrolytically polished,
It may be formed into a curved shape by means such as mechanical polishing or chemical polishing. For example, the radius of curvature of this curved surface is
It is preferably about 0.005 to 0.3 mm. Further, it is preferable that the tip edges 30A, 30B of the one end sides 21A, 21B are also curved.

According to the above embodiment, the metal foils 2A and 2B's one end sides 21A and 21B each have the following shapes:
The glass members 10A and 10 have a tapered trapezoid shape with both corners of the rectangle cut diagonally, and the tips of adjacent metal foils are substantially flat without overlapping each other.
Since it is arranged in close contact with the bottom end surfaces 106A and 106B of metal foils 2A and 2B, one end side 21A of metal foils 2A and 2B
and the sealed tube part 81A without applying excessive force to 21B.
81B and the glass members 10A and 10B can be connected by heating and melting, and as a result, distortion occurs in the glass portions of the sealed tube portions 81A and 81B that contact the one end sides 21A and 21B of the metal foils 2A and 2B. can be suppressed.

Moreover, in the glass members 10A and 10B,
Ridge line 10 at bottom edge 101A and 101B
3A and 103B, and opening end edges 102A and 1
Since the ridge lines 104A and 104B in 02B are formed in a straight line, the bent portion 2 of the metal foil 2A
3A, 24A and bent portions 23B, 2 of metal foil 2B
4B to ridgelines 103A, 104A and ridgeline 103
B, 104B can be brought into close contact with the metal foils 2A without any difficulty.
3A, 24A and bent portions 23B, 2 of metal foil 2B
The sealing tube parts 81A and 81B and the glass members 10A and 10B can be sufficiently airtightly connected by heating and melting without causing wrinkles in 4B and the surrounding area, and in this respect, distortion due to the wrinkles is also avoided. Therefore, the occurrence of cracks can be prevented and the service life will not be shortened.

As a result of the above, it is possible to obtain a large current capacity by using metal foils 2A and 2B with a relatively large width, and it is possible to light the lamp safely for a long time without causing an extremely dangerous accident such as an explosion of the envelope. It can be stably lit over a period of time and has a long service life.

On the one end sides 21A and 21B of the metal foils 2A and 2B, the notches 27A and 27B are
By forming the cut ends 29A and 29B into smooth curved surfaces, if there are burrs on the cut ends 29A and 29B, the glass portions of the sealing tube portions 81A and 81B that come into contact with the burrs will be strained due to the burrs. Even if such distortion may occur, it is possible to suppress the occurrence of such distortion.

[Experiment example]

The high-pressure mercury lamp according to the present invention (the pressure inside the bulb when lit is approximately 20 atmospheres) is constructed based on the configuration shown in Figure 1 A to I.
We manufactured 1,000 lamps and used conventional high-pressure mercury lamps (the pressure inside the bulb when lit is approximately 20
An experiment was conducted in which 1,000 high-pressure mercury lamps (atmospheric pressure) were manufactured and these high-pressure mercury lamps were actually turned on, and it was found that the high-pressure mercury lamp according to the present invention could be used for a long period of time without causing any cracks. I was able to get the lights to turn on stably. In contrast, in conventional high-pressure mercury lamps, 100 out of 1000
The book caused an explosion and was extremely unsafe.

In addition, we fabricated 1,000 high-pressure mercury lamps according to the present invention and 1,000 conventional high-pressure mercury lamps in the same manner, except that the pressure inside the envelope when lit was changed to approximately 30 atmospheres, and conducted an experiment in which they were actually lit. In the high-pressure mercury lamp according to the present invention, all 1000 high-pressure mercury lamps were able to be lit stably for a long period of time without any cracks. In contrast, in conventional high-pressure mercury lamps, out of 1000
200 of them caused explosions, and as the pressure inside the enclosure increases when the lights are turned on, explosions are more likely to occur, and safety was extremely low.

Although one embodiment of the present invention has been described above, various modifications can be made to the present invention. That is, (1) the present invention is useful when the number of metal foils 2A and 2B is four or more, and may be five or more.

(2) The outer shape of the glass members 10A and 10B is not limited to an octagonal columnar shape, but may be appropriately selected depending on the number of metal foils 2A and 2B used, and may be, for example, a quadrangular columnar shape, a hexagonal columnar shape, or other shapes.

(3) Edge lines 104A and 1 of opening end edges 102A and 102B in glass members 10A and 10B
It is not necessarily necessary that 04B be linear. This is the ridgeline 104A and 104B.
Bent portions 24 of metal foils 2A and 2B bent at
Even if wrinkles occur in A and 24B, there is no need to consider the intrusion of mercury when welding the open end sides of glass members 10A and 10B and sealed tube parts 81A and 81B, and moreover, The glass of the sealed tube parts 81A and 81B is heated and pressed to the extent that the open end side of the sealed tube parts 81A and 81B can be held, or the glass of the sealed tube parts 81A and 81
Since it is sufficient to apply negative pressure inside B and heat weld it using this negative pressure, the wrinkles do not necessarily have to be in close contact with the glass part, and the opening end side is relatively soft compared to the bottom side during lighting. This is because the temperature is low and it is not affected by high pressure, so even if the wrinkles and the glass part are in close contact, no cracks will occur due to the wrinkles.

[Effect of idea]

According to the present invention, one end side of each of the four or more metal foils is spaced apart from each other and closely attached to the bottom end surface of the glass member in a substantially flat state, so that the one end side is not subjected to unreasonable deformation. When the one end sides overlap, the glass part of the sealed tube part that comes into contact with the overlapped part does not suffer from distortion, and in addition, the ridge line at the bottom edge of the glass member is straight, Since the bent portion of the metal foil can be brought into close contact with the ridgeline, wrinkles do not occur in the bent portion and its surroundings, and in this respect as well, generation of distortion in the sealed tube portion is prevented.

As a result, it is possible to obtain a large current capacity using a relatively wide metal foil, and to achieve extremely safe lighting without causing an explosion accident.
Moreover, a high pressure discharge lamp with a long service life can be obtained.

[Brief explanation of the drawing]

Fig. 1 A and B show a side view and a front view, respectively, of a glass member in a high-pressure discharge lamp according to an embodiment of the present invention, and Fig. 1 C, D, and Ho respectively show a conductive part for sealing in the embodiment. Explanatory front view,
An explanatory enlarged vertical right side view, an explanatory vertical left side view, and FIG. 1 is an explanatory longitudinal sectional front view showing a high-pressure discharge lamp in this embodiment, and FIGS. Figures 2A and 2B are side and front views showing the glass members of a conventional high-pressure discharge lamp, respectively, and Figures 2C, 2D, and 3E respectively show the conductive parts for sealing of a conventional high-pressure discharge lamp. An explanatory front view, an explanatory right side view, an explanatory left side view, a second
FIG.
FIG. 2 is an explanatory longitudinal sectional front view showing the configuration of a conventional high-pressure discharge lamp. 1A, 1B...Glass member, 2A, 2B...Metal foil, 11A, 11B...Bottom edge, 13A, 1
3B... Opening end edge, 3A, 3B... Internal lead rod, 4A, 4B... External lead rod, 5A, 5B...
...Conductive part for sealing, 6A, 6B... Electrode, 8... Enclosure, 81A, 81B... Sealing tube part, 82... Light emitting space surrounding part, 9A, 9B... Narrowing part, 23A, 2
4A, 23B, 24B...Bending portion, 10A, 10
B... Glass member, 101A, 101B... Bottom edge, 102A, 102B... Opening edge, 10
3A, 104A, 103B, 104B...ridge line,
105A, 105B...Flat surface, 106A, 10
6B...Bottom end surface, 50A, 50B...Conductive part for sealing, 27A, 27B...Notch part, 28A, 28
B...Connection member, 29A, 29B...Cut, 3
0A, 30B...Tip edge.

Claims (1)

[Claims for Utility Model Registration] A glass enclosure consisting of a light-emitting space surrounding section and a sealed tube section following it, and an open end of the sealed tube section facing toward the outer end of the sealed tube section. A bottomed cylindrical glass member arranged, an external lead rod inserted into the cylindrical hole of the glass member, and an internal lead rod arranged so as to extend from the bottom end face of the glass member into the light emitting space surrounding section. , an electrode provided at the tip of the internal lead rod, extending along the outer periphery of the glass member, one end of which is bent at the ridgeline of the bottom edge of the glass member and connected to the internal lead rod, and the other end thereof. four or more strip-shaped metal foils, each of which is spaced apart in the circumferential direction of the glass member, the sides of which are bent at the ridgeline of the opening end edge of the glass member and connected to the external lead rod; The ridgeline of the bottom edge of the glass member is linear, and the outer periphery of the glass member and the inner periphery of the sealed tube portion are hermetically welded via the metal foil, so that the inside of the enclosure is hermetically sealed. A high-pressure discharge lamp consisting of a high-pressure discharge lamp, wherein the sealed tube portion of the envelope is formed with a narrowed portion on the side surrounding the light emitting space along the bottom end surface of the glass member, and a narrowed portion of the metal foil is formed on the side surrounding the light emitting space. The other end side located on the bottom end surface of the glass member is
A high-pressure discharge lamp characterized in that the shape of each tip of the metal foil is a tapered trapezoid with both corners of the rectangle cut off diagonally, and the tips of adjacent metal foils do not overlap each other.