JP2583317Y2 - lamp - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp, and more particularly to a lamp having a hermetically sealed structure suitable for a large current.

[0002]

2. Description of the Related Art In general, lamps such as mercury lamps are widely used in fields utilizing ultraviolet rays emitted therefrom, for example, in the photochemical industry, in the field of manufacturing semiconductor devices, and in other fields.

For example, in a high-current or ultra-high-pressure mercury lamp for a large current, the amount of mercury, which is the main component of the luminescent gas, is large, the gas pressure in the envelope at the time of lighting is very high, and the calorific value is large. The glass of the hermetically sealed portion needs to have high heat resistance and pressure resistance.
During lighting, it is necessary that the mercury in the enclosure is completely evaporated. Therefore, it is necessary that there is no low temperature portion in the envelope during lighting in which mercury is condensed.

In view of the above, in a conventional high-pressure or ultra-high-pressure mercury lamp, a so-called rod which achieves hermetic sealing of the envelope by directly welding glass forming the envelope of the lamp to a power supply lead rod. Instead of a seal structure,
A so-called foil seal structure using a metal foil for sealing is employed.

FIG. 6 is an explanatory view showing an example of a high-pressure mercury lamp having a foil seal structure. In this high-pressure mercury lamp, a tapered outer peripheral surface of the tapered wall portion that follows the bottom wall outer end face 12 (hereinafter, this portion of "tapered portion") to the peripheral wall 16 of the glass member 1 having a T, of the glass member 1 strip of metal foil 2 so as to extend in the axial direction of the glass member 1 in the circumferential direction apart from each other, are arranged four example, each of the end portion 21 of the metal foil 2, the taper of the peripheral wall 16 of the glass member 1 The other end of each of the metal foils 2 is connected to a metal plate 31 disposed at the base end of the internal lead bar 3 which extends along the portion T and further protrudes from the outside of the bottom wall 15. The part 22 is connected to the outer periphery of the external lead rod 4 inserted into the cylindrical hole of the glass member 1 to form the conductive part 5 for sealing. Reference numeral 10 denotes a glass cylinder for holding the external lead 4 inserted into the glass member 1, and reference numeral 6 denotes the internal lead 3.
The electrode 7 fixedly provided at the tip of is a glass cylinder for holding the internal lead 3.

[0006] Then, the sealing conductive portion 5 is inserted and arranged in the sealing tube portion 81 of the glass sealing member 8 so that the electrode 6 is positioned in the light emitting space surrounding portion 82 of the sealing member 8. Heat treatment from the outside of the inside of the sealing pipe 81 and the glass
The outer periphery of the member 1 is hermetically welded via the metal foil 2.
Then, on the base end side of the inner lead rod 3, the glass at the portion of the sealing tube portion 81 facing the glass cylinder 7 is heated and pressed , or a negative pressure is applied to the inside of the sealing tube portion 81 . The glass tube 7 is welded by this negative pressure to form the constricted portion 9, and the sealing tube portion 81 is formed.
At the outer end portion, the exposed portion of the metal foil 2 is covered with the glass by heating and melting the glass at the outer end portion. Also in the other sealing tube portion, a high-pressure mercury lamp is configured by connecting the sealing conductive portion configured similarly to the sealing conductive portion 5 in the same manner as described above.

[0007]

However, the conventional high-pressure mercury lamp having the above-described structure is generally used for a current of 50 to 150 A. For example, a high-pressure mercury lamp for a large current of 200 A or more is manufactured. Then, cracks and the like occur in the sealing tube portion 81, and a long service life cannot be obtained.
There is a problem.

The present invention has been made in view of the above circumstances, and has as its object a long service life without causing an accident in the glass part of the sealing tube even for a large current. It is to provide a lamp which can obtain the following.

[0009]

A lamp according to the present invention is a glass member having a light emitting space surrounding portion, a sealing tube portion following the light emitting space surrounding portion, and a tapered portion disposed inside the sealing tube portion and having a tapered portion on the light emitting space side. A metal plate disposed on the light emitting space side of the glass member, an internal lead rod having a base end fixed to the metal plate, and a distal end disposed to extend into the light emitting space; and An electrode or filament provided at the tip, an external lead bar extending outward from the sealing tube, and connected to the metal plate at one end, and extending in the longitudinal direction on the outer surface of the glass member. In a lamp made of a metal foil electrically connected to the external lead bar at the other end, the metal foil is formed such that the width thereof is gradually reduced in the tapered portion of the glass member. Moni, its opposite edges are formed in a knife edge shape, the metal foil is a plurality, substantially equal intervals
The glass member is disposed so as to extend on an outer surface of the glass member . Furthermore, at the outer peripheral edge of the metal plate
The distance between adjacent metal foils must be 1 to 5 mm.
And features .

[0010] The lamp of the present invention includes a light emitting space surrounding portion,
And a sealing tube portion following this, a glass member disposed inside the sealing tube portion and having a tapered portion on the light emitting space side, a metal plate disposed on the light emitting space side of the glass member, and a base end. An inner lead rod fixed to the metal plate and arranged so that the tip of the inner lead rod extends into the light emitting space; an electrode or a filament provided at the tip of the inner lead rod; An external lead rod extending outward,
One end is connected to the metal plate, a lamp made of a metal foil extending the outer surface of the glass member in the longitudinal direction and electrically connected to the external lead bar at the other end, wherein the metal foil includes The present invention is characterized in that another metal foil is further laminated on a portion extending in the longitudinal direction on the outer surface of the glass member .

[0011]

The glass member has a plurality of outer surfaces extending in the longitudinal direction thereof.
Each of the metal foils is located at the tapered portion of the glass member.
Therefore, while the width is formed so as to become gradually smaller,
Both edges are shaped like a knife edge.
However, these metal foils are almost equally spaced
Is disposed so as to extend on the outer surface of the glass member, so that the distortion generated in the hermetic sealing portion due to the outer peripheral surface of the glass member on the light emitting space surrounding portion side and the inner wall surface of the sealing tube portion is small, and as a result, Life is obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the lamp according to the present invention will be described below for the case of constituting a high-pressure mercury lamp. FIG. 1 is an explanatory diagram showing a configuration of an embodiment of the present invention. In this figure, 1
Is a glass cylinder (hereinafter, also referred to as a bottomed cylinder ), 2 is a first metal foil, 3 is an internal lead rod, 4 is an external lead rod, and 25 is a first metal foil which is disposed on the first metal foil 2. 2 metal foils, 31
Is a metal plate, and 41 is a metal member, and these constitute the conductive part 5 for sealing. Reference numeral 6 denotes an electrode, and 8 denotes a sealing body.

A cylindrical bottomed cylinder 1 made of quartz glass
Has a tapered portion T on the peripheral wall 16 at a portion following the outer end surface 12 of the bottom wall 15, and the bottom is formed in a truncated cone shape.

A disk-shaped metal plate 31 having a diameter slightly smaller than the diameter of the bottom wall outer end surface 12 is disposed on the bottom wall outer end surface 12 of the bottomed cylindrical body 1. The internal lead bar 3 is provided so as to extend in the axial direction of the sealing body 8 toward the light emitting space surrounding portion 82. A cylindrical electrode 6 is provided at the tip of the inner lead rod 3, and the outer periphery of the inner lead rod 3 and a constriction 9 in the sealing body 8 are provided.
A glass cylinder 7 for holding the internal lead rod 3 is disposed between the glass cylinder 7 and the inner periphery of the glass cylinder.

The method of connecting the metal plate 31 and the internal lead bar 3 is not particularly limited. For example, the metal plate 31 and the internal lead bar 3 are butt-welded, or a hole is formed in the center of the metal plate 31. A method of inserting the base end of the internal lead rod 3 into this hole and welding the both can be used.
Materials for forming the metal plate 31 include tantalum,
Refractory metals such as niobium, tungsten, and molybdenum can be used.

An external lead rod 4 having an outer diameter suitable for this is inserted into the cylindrical hole of the bottomed cylindrical body 1, and connected to the external lead rod 4 at the open end of the bottomed cylindrical body 1. A dish-shaped metal member 41 having a hole formed in the bottom portion is arranged, and a glass cylinder for holding the external lead rod 4 is arranged via the metal member 41. As a material for forming the metal member 41, molybdenum or the like can be given.

On the outer periphery of the bottomed cylindrical body 1, a strip-shaped first metal foil 2 made of molybdenum is provided so as to extend in the axial direction of the bottomed cylindrical body 1 at substantially equal intervals in the circumferential direction.
One end 21 of each of these first metal foils 2 extends along the tapered portion T of the peripheral wall of the bottomed cylinder 1.
They extend in a state of being separated from each other at substantially equal intervals, and are further connected to a metal plate 31 arranged at the base end of the internal lead rod 3 by means such as spot welding. In addition, metal foil 2
Are connected to the metal member 41.

As shown in FIG. 2A, the first metal foil 2 is formed such that both side edges 23 and 24 of the one end portion following the one end portion 21 connected to the metal plate 31 become closer to the one end portion 21. Is formed as a hypotenuse portion S whose width is reduced, and this hypotenuse portion S is formed in a knife edge shape as shown in FIG. Further, as shown in FIG. 2C, the oblique side S is located on the outer peripheral surface of the tapered portion T of the bottomed cylindrical body 1.

At the tip edge of each end 21 of the metal foil 2, there is formed a notch-shaped arc-shaped concave portion C having a radius of curvature substantially the same as the radius of curvature of the outer peripheral surface of the inner lead bar 3, As shown in FIG. 3, the metal foil 2 is welded to the metal plate 31 in a state where the arc-shaped concave portion is in contact with the outer peripheral surface of the internal lead rod 3.

The distance P1 between the adjacent first metal foils 2 at the outer peripheral edge of the metal plate 31 varies depending on the diameter of the metal plate 31, but is usually selected in the range of 1 to 5 mm. When the separation distance P1 is less than 1 mm, the distortion of the sealing pipe 81 increases near the outer peripheral edge of the metal plate 31, so that the pressure resistance of the sealing pipe 81 decreases. When the separation distance P1 is 5 mm or more, the metal plate 31
It is necessary to reduce the width of the metal foil 2 or the number of the metal foils 2 at the outer peripheral edge of the above, so that it is difficult to cope with a large current.

As shown in FIG. 4, the distance P2 between the adjacent first metal foils 2 on the outer peripheral surface of the portion of the bottomed cylinder 1 below the tapered portion T is equal to the distance of the bottomed cylinder 1. Although it depends on the diameter, it is usually selected in the range of 1 to 5 mm for the same reason as the distance P1 between the adjacent first metal foils 2 at the outer peripheral edge of the metal plate 7 described above.

As shown in FIG. 5, on the outer surface of the first metal foil 2, a second metal foil 2 made of molybdenum
5 are arranged. The second metal foil 25 is disposed at a portion other than the one end portion following the one end portion 21 of the first metal foil 2, and in particular, a tip 25 a at one end side of the second metal foil 2
It is preferable that the distance d1 from the bottom to the rear edge R of the tapered portion T of the bottomed cylindrical body 1 is arranged to be 1 to 2 mm. By arranging the second metal foil 25 in this way, the sealing between the tapered portion T of the bottomed cylindrical body 1 and the sealing tube portion 81 becomes sufficient, and the pressure inside the sealing body 8 can be sufficiently endured. It will be.
In addition, the second metal foil 25 is provided at the other end 2 of the first metal foil 2.
It is preferable that the distance d2 from the tip 25b on the other end side of the second metal foil 25 to the opening edge 13 of the bottomed cylinder 1 is 1-2 mm. Is preferably performed. By arranging the second metal foil 25 in this manner, the sealing between the opening end side of the peripheral wall of the bottomed cylindrical body 1 and the sealing pipe portion 81 is sufficient, and The oxidation of the first metal foil 2 and the oxidation of the second metal foil are prevented.

Then, by heating the bottomed cylinder 1 from the outside of the sealing tube 81 of the sealing body 8, for example, the outer periphery of the bottomed cylinder 1 and the inner periphery of the sealing tube 81 become the first metal. The glass is hermetically welded through the foil 2 and the second metal foil 25, and further, at the base end side of the inner lead bar 3, the glass in the portion of the sealing tube portion 81 facing the glass cylinder 7 is heated and pressed. Alternatively, by applying a negative pressure to the sealing pipe portion 81 and welding the glass tube 7 with the negative pressure,
A constriction 9 is formed. Although not shown, the other sealing tube is connected to the sealing conductive portion configured in the same manner as the sealing conductive portion 5 in the same manner as described above, and the sealing body 8 is formed.

According to the above embodiment, the outer surface of the bottomed cylinder 1
Of a plurality of first metal foils 2 extending along its longitudinal direction .
Each has, on both side edges 23 and 24 of the one end portion following the one end portion 21 connected to the metal plate 31, a hypotenuse portion S formed so that its width decreases toward the one end portion 21. The hypotenuse portion S is formed in a knife edge shape, and is formed on the outer surface of the bottomed cylindrical body 1 including the tapered portion T.
In the condition that they are separated from each other at almost equal intervals in the circumferential direction
Since it is arranged , one end 21 of the first metal foil 2
The distortion generated in the hermetically sealed portion by the outer peripheral surface of the bottomed cylindrical body and the inner wall surface of the sealing tube portion 81 at both side edges of the one end side portion is reduced.

Also, since the second metal foil 25 is arranged so as to overlap the first metal foil 2, the thickness (cross-sectional area) is large.
Conductive paths are formed, the electrical resistance is reduced, and the first gold
Heat Q generated in metal foil 2 and second metal foil 25
Is proportional to the electric resistance (Q = I ² R), so that heat generation of the sealing conductive portion 5 due to a large current can be suppressed. As a result, distortion of the sealing tube portion 81 generated during lighting can be suppressed to a small value. can do.

Although one embodiment of the present invention has been described above, various changes can be made in the present invention. For example, the outer shape of the bottomed cylindrical body 1 is not limited to a columnar shape, and is appropriately selected according to the number of the first metal foils 2 to be used.
It may have a hexagonal column shape or other shapes.

Further, the other end 22 of the first metal foil 2 is bent at the opening end edge 13 of the bottomed cylindrical body 1 without using the metal member 41 and is directly connected to the outer periphery of the external lead rod 4. You may.

Further, if necessary, a metal foil can be further arranged so as to overlap the second metal foil 25.

The hermetically sealed structure described above can be used for other lamps requiring a large current.
For example, instead of using the electrode 6, a so-called incandescent light bulb connected to a coiled filament may be used.

[0030]

[Effects of the Invention] As described above, according to the present invention,
It is possible to provide a lamp capable of obtaining a long service life without causing an accident in the glass portion of the sealing tube even for a large current.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional front view showing an enlarged main part of an embodiment of the present invention.

FIG. 2 is an explanatory view showing a first metal foil in one embodiment of the present invention.

FIG. 3 is an explanatory view showing a connection state between a first metal foil and a metal plate in one embodiment of the present invention.

FIG. 4 is an explanatory view showing an arrangement state of a first metal foil in one embodiment of the present invention.

FIG. 5 is an explanatory view showing an arrangement state of a second metal foil in one embodiment of the present invention.

FIG. 6 is an explanatory longitudinal sectional front view showing a configuration of a conventional discharge lamp having a foil seal structure.

[Explanation of symbols]

Reference Signs List 1 bottomed cylindrical body 12 bottom wall outer end face 13 open end edge 15 bottom wall 16 peripheral wall 2 first metal foil 21 one end 22 other end 25 second metal foil 3 internal lead rod 31 metal plate 4 external lead rod 41 Metal member 5 Sealing conductive part 6 Electrode 7 Glass cylinder 8 Seal 81 Sealing tube part 82 Light emitting space surrounding part 9 Narrowed part 10 Glass cylinder C Arc-shaped concave part S Oblique side T Tapered part

Continuation of the front page (56) References JP-A-61-147447 (JP, A) JP-A-2-142053 (JP, A) JP-A-62-147057 (JP, U) JP-A-4-99663 (JP) , U) Hikaru Hei 3-28650 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) H01J 61/36 H01K 1/38 H01K 1/40

Claims (3)

(57) [Scope of request for utility model registration] 1. A light emitting space surrounding portion, a sealing tube portion following the light emitting space surrounding portion, a glass member arranged inside the sealing tube portion and having a tapered portion on the light emitting space side, and a glass member on the light emitting space side of the glass member. A metal plate disposed, a base end fixed to the metal plate, a distal end of which is disposed so as to extend into the light emitting space; and an electrode or electrode provided at a distal end of the internal lead rod. An external lead rod extending outward from the sealing tube portion, connected to the metal plate at one end, and extending in the longitudinal direction on the outer surface of the glass member, and having the external lead rod at the other end. In a lamp made of a metal foil electrically connected to the glass member, the metal foil is formed so that its width is gradually reduced in a tapered portion of the glass member, and both end edges are knife-edge. Jo is formed on the metal foil
There are multiple sheets, and the outer surface of the glass member is
A lamp characterized by being arranged to extend . 2. An adjacent metal foil at an outer peripheral portion of a metal plate
The lamp according to claim 1, wherein a distance between the lamps is 1 to 5 mm . 3. A light emitting space surrounding portion, a sealing tube portion following the light emitting space surrounding portion, a glass member disposed inside the sealing tube portion and having a tapered portion on the light emitting space side, and a glass member on the light emitting space side of the glass member. A metal plate disposed, a base end fixed to the metal plate, a distal end of which is disposed so as to extend into the light emitting space; and an electrode or electrode provided at a distal end of the internal lead rod. An external lead rod extending outward from the sealing tube portion, one end of which is connected to the metal plate, and the outer surface of the glass member extends in the longitudinal direction thereof, and the other end of the external lead rod extends at the other end. A lamp made of a metal foil electrically connected to a metal foil, wherein another metal foil is further laminated on the metal foil at a portion extending in the longitudinal direction of the outer surface of the glass member.