JP2596889Y2 - Discharge 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 discharge lamp, and more particularly, to a discharge lamp having a hermetically sealed structure particularly suitable for a large current.

[0002]

2. Description of the Related Art Discharge lamps, for example, mercury lamps, are widely used in fields utilizing ultraviolet rays emitted therefrom, for example, in the photochemical industry, in the manufacture of 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 luminous tube 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 arc tube is completely evaporated. Therefore, it is necessary that there is no low temperature portion in the arc tube during lighting in which mercury condensation occurs.

[0004] For this reason, in a conventional high-pressure or ultra-high-pressure mercury lamp, a so-called rod seal that achieves hermetic sealing of the arc tube by directly welding the glass forming the arc tube to a power supply lead rod. Instead of a structure, a so-called foil seal structure using a sealing metal foil is employed.

FIG. 4 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 peripheral wall 16 of a bottomed cylindrical glass member 1 having a tapered outer peripheral surface having a tapered outer peripheral surface at a peripheral wall portion following one end surface 11 on the bottom wall B side is separated from each other in the circumferential direction of the glass member 1. The band-shaped metal foil 2 extends in the axial direction of the glass
It is single arrangement. One end 2 of each of these metal foils 2
1 is connected to a metal plate 3 arranged at the base end of an internal lead rod 4 arranged to protrude and extend from one end face 11 of the glass member 1, while the other end 22 of each of the metal foils 2 is connected.
Is the external lead rod 5 inserted into the cylindrical hole of the glass member 1.
Is connected to the outer periphery of A glass inner lead rod holding cylinder 6 is arranged on the outer periphery of the inner lead rod 4, and a glass cylinder is provided between the outer periphery of the outer lead rod 5 and the inner periphery of the cylindrical hole of the glass member 1. Are arranged to form a sealing conductive portion S. Also, 9
Is an electrode fixedly provided at the tip of the internal lead bar 3.

[0006] The conductive portion S for sealing configured as described above is inserted and arranged in the sealing tube portion 81 of the glass envelope 8 so that the electrode 9 is located in the light emitting space surrounding portion 82 of the envelope 8. Then, the sealing body 8 in which the sealing conductive portion S is inserted and arranged,
For example, 100 r. p. m. While rotating in the circumferential direction at about the same speed, a heat treatment is performed from the outside of the sealing tube portion 81 using a burner or the like, and the sealing tube portion 81 is heated.
Is hermetically welded to the outer periphery of the glass member 1 via the metal foil 2. On the base end side of the inner lead rod 4,
The glass at the portion of the sealing tube portion 81 facing the internal lead rod holding cylinder 6 is heated and pressed, or the sealing tube portion 8 is heated or pressed.
By applying a negative pressure to the inside 1 and welding the inner lead rod holding cylinder 6 with the negative pressure, a constricted portion K is formed. The exposed portion of the metal foil 2 is covered with glass by heating and melting the portion of the glass. Also, in the other sealing tube portion, a sealing conductive portion configured similarly to the sealing conductive portion S is connected in the same manner as described above.

[0007]

However, the conventional high-pressure mercury lamp having the above-mentioned structure is usually 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, the following problem occurs.

(1) In a high-pressure mercury lamp for a large current, since a large heat capacity is required for the electrode 9, for example, an electrode of 500 g or more is used. Such an electrode 9
Since the weight of the electrode 9 side is larger than the weight of the external lead rod 5 side in the sealing conductive portion S in which is installed, the external lead rod 5 side and the electrode 9 side cannot be balanced, and FIG. As shown in the figure, a sealing tube portion forming the sealing tube portion 81 of the sealing member 8 with the electrode 9 side inclined downward with respect to the axial direction of the sealing member 8.
Will be placed in the material . In such a state, when the sealing body 8 on which the conductive portion S for sealing is arranged is rotated in a circumferential direction by a glass lathe, the centrifugal force causes the metal foil 2 to be pulled in the direction in which the metal foil 2 extends. Is disconnected.

(2) In the step of connecting the sealing tube portion 81 and the conductive portion S for sealing, the portion of the sealing tube portion 81 facing the internal lead rod holding cylinder 6 is uniformly heated over its entire area. Subsequent portions on the light emitting space surrounding portion 82 side are similarly heated. For this reason, as shown in FIG. 6, the sealing pipe 81 is
A deformed portion H is formed at an end of the light emitting space surrounding portion 82 on a portion facing the light emitting space surrounding portion 82, and is welded to the internal lead rod holding cylinder in this state. As a result, during the operation of the high-pressure mercury lamp, cracks and the like occur in the sealing tube portion 81, and a long service life cannot be obtained.

[0010] The present invention has been made based on the above-described circumstances, and the purpose of the present invention is to provide a high current
A discharge lamp capable of obtaining a long service life without a metal foil being cut in a connecting step between a sealing conductive portion and a sealing tube portion, and without causing an accident of a glass portion of the sealing tube portion. To provide.

[0011]

DISCLOSURE OF THE INVENTION The discharge lamp of the present invention comprises:
A glass envelope comprising a light emitting space surrounding portion and a sealing tube portion following the glass member, a columnar glass member disposed inside the sealing tube portion of the sealing member, and a glass member disposed on the light emitting space surrounding portion side of the glass member. A metal plate disposed on one side facing, an inner lead bar fixed at the base end to the metal plate, and a distal end disposed so as to extend into the light emitting space surrounding portion; and a distal end of the inner lead rod. An electrode, made of glass disposed between the outer periphery of the inner lead rod and the inner periphery of the sealing tube of the sealing body.
An inner lead rod holding cylinder, an external lead rod disposed on the other side of the glass member facing the outer end side of the sealing tube, and extending along the outer periphery of the glass member, one end of which is made of metal; connected to the plate, it becomes the other end and an electrically connected metal foil to the external lead rod, the internal Lee
De rod cylindrical retaining member, the outer diameter of one end surface of the metal plate side is substantially the same as the diameter of the metal plate, one end following the end surface
The part is formed in a tapered shape with a gradually increasing diameter.
A cylindrical body is formed following the
It is characterized by being welded to the inner circumference of the sealing tube .

[0012] The internal lead rod cylindrical retaining body, characterized by the this <br/> having a mortar-like recess on the other end surface of the emission space surrounding portion side.

[0013]

The glass inner lead rod holding cylinder disposed between the outer circumference of the inner lead rod and the inner circumference of the sealing tube of the sealing body.
The outer diameter of one end face on the metal plate side is substantially the same as the diameter of the metal plate
The one end following this one end gradually increases in diameter.
Is formed in a tapered shape, and a cylindrical body is formed following this one end.
Formed so that the body has a large diameter
Therefore, a tubular sealing tube is formed to form a sealing tube.
When the conductive part for sealing is arranged in the material, even if the inclination with respect to the axial direction of the sealing body occurs, the degree is small, and as a result, the cutting of the metal foil in the connecting step between the conductive part for sealing and the sealing tube part Can be prevented.

[0014] The internal lead rod cylindrical retaining body, since the outer diameter of one end face of the metal plate side is virtually identical to the diameter of the metal plate, the outer peripheral surface of the inner lead pin cylindrical retaining member Along
Thus, a sealed tube portion welded can be formed .

[0015] The internal lead rod cylindrical retaining body, the other end surface of the emission space surrounding portion side has a cone-shaped recess
Therefore, for holding the internal lead rod in the sealing tube part forming material
On the light emitting space surrounding portion side of the portion facing the cylindrical body , even if it is heated with a smaller amount of heat compared to the outer end side, the inner lead rod holder is held.
The holding cylinder can be welded, and as a result, a deformed portion is prevented from being formed at the light emitting space surrounding portion side end of the portion of the sealing pipe portion located on the outer periphery of the inner lead rod holding cylinder.
Is stopped.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a discharge 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 illustrating one end side of the discharge lamp according to the embodiment. In this figure, 1 is a cylindrical glass member, 2 is a strip-shaped metal foil, 3 is a disk-shaped metal plate, 4 is an internal lead bar, 5 is an external lead bar, 51 is a dish-shaped metal member, and 6 is an inner plate. The lead rod holding cylinder 7 is an external lead rod holding cylinder, and these form a conductive portion S for sealing. Also, 9
Reference numeral 8 denotes an electrode, and reference numeral 8 denotes a sealing body including a light emitting space surrounding portion 82 and a sealing tube portion 81 following the light emitting space surrounding portion 82.

The cylindrical glass member 1 has a tapered outer peripheral surface at a portion of the peripheral wall 16 following the one end surface 11 on the light emitting space surrounding portion 82 side, and a portion on the one end surface 11 side has a truncated cone shape. It is configured. In addition, a hole 13 for installing the external lead bar 5 is formed in the other side surface 12 on the outer end side of the sealing tube portion 81.

A disk-shaped metal plate 3 having a diameter slightly smaller than the diameter of the one end surface 11 is arranged on one end surface 11 of the glass member 1, and an inner lead rod 4 is provided at the center of the metal plate 3. It is fixed so as to extend in the axial direction of the sealing body 8 toward the light emitting space surrounding portion 82. An electrode 9 is provided at the tip of the internal lead bar 4.

The connection method between the metal plate 3 and the internal lead rod 4 is not particularly limited.
Or a method in which a hole is formed in the center of the metal plate 3 and the base end of the internal lead rod 4 is inserted into this hole to weld them together. Materials for forming the metal plate 3 include tantalum, niobium,
Refractory metals such as tungsten and molybdenum are mentioned.

Between the outer periphery of the inner lead bar 4 and the inner periphery of the sealing tube 81 of the sealing body 8, a glass inner lead rod holding cylinder 6 is disposed.

FIG. 2 is an explanatory view showing an example of the internal lead rod holding cylinder 6. This internal lead rod holding cylinder 6 is
One end portion 65 following the one end surface 61 on the metal plate 3 side is formed in a tapered shape having a gradually increasing diameter, and a cylindrical body portion 62 formed subsequently has a light emission of the internal lead rod holding cylinder 6. It extends to the space surrounding portion 82 side end.

The outer diameter D of the body 62 is adapted to the inner diameter of the material for forming the sealing tube 81 for forming the sealing tube 81 of the sealing body 8 ;
0.5mm~1.0mm is smaller diameter than the cost of the inner diameter. Further, the outer diameter d of one end face 61 of the inner lead rod holding cylinder 6 on the metal plate 3 side is substantially the same as the diameter of the metal plate 3.

The inner lead rod holding cylinder 6 has a horn-shaped recess 64 in the other end surface 63 on the light emitting space surrounding portion 82 side. In particular, the outer peripheral edge 66 of the other end surface 63 has a knife edge shape. Is preferably formed.

A stopper 41 made of a molybdenum wire wound around the outer periphery of the inner lead rod 4 is provided at the end of the cylindrical hole of the inner lead rod holding cylinder 6 on the light emitting space surrounding portion 82 side. The inner lead rod holding cylinder 6
Can be prevented from being displaced.

An external lead rod 5 having an outer diameter adapted to the hole 13 is inserted into the hole 13 of the glass member 1, and the other end surface 12 of the glass member 1 has a bottom portion connected to the external lead rod 5. A dish-shaped metal member 51 having a hole formed therein is arranged,
An external lead rod holding cylinder 7 made of glass is arranged via the metal member 51. As a material for forming the metal member 51, molybdenum or the like can be given.

On the outer periphery of the glass member 1, for example, six strip-shaped molybdenum metal foils 2 extending in the axial direction of the glass member 1 are arranged apart from each other in the circumferential direction. Each end 21 extends along the tapered portion of the peripheral wall 16 of the glass member 1 and is connected to the metal plate 3 disposed at the base end of the internal lead rod 4 by means such as spot welding. . The other end 22 of each metal foil 2 is connected to a metal member 51.

As shown in FIG. 3A, a notch-like shape having a radius of curvature substantially equal to the radius of curvature of the outer peripheral surface of the inner lead bar 4 is formed at the leading edge of one end 21 of the metal foil 2. An arc-shaped recess A is formed, and the metal foil 2 is welded to the metal plate 3 in a state where the arc-shaped recess A is in contact with the outer peripheral surface of the internal lead rod 4.

Further, each of the metal foils 2 has two side edges 23, 24 at one end side portion following the one end portion 21 connected to the metal plate 3.
Is formed as a hypotenuse portion L whose width decreases toward the one end portion 21. This hypotenuse portion L is formed as shown in FIG.
As shown in FIG. The hypotenuse portion L is located on a tapered outer peripheral surface of the peripheral wall 16 of the glass member 1 as shown in FIG.

Then, the sealing body in which the conductive portion S for sealing is arranged
Sealing the forming material while rotating it with a glass lathe, for example
Heat treatment from outside of the tube forming material allows metal
Of the sealing tube portion forming material on the outer periphery of the glass member 1 through the foil 2
The inner circumference is welded airtight and the inner lead rod
The inner periphery of the material for forming the sealing tube is melted airtightly around the outer periphery of the holding cylinder 6.
To form a sealing tube 81 having a constricted portion K formed therein.
It is. Also in the other sealed tube portion, although not shown, sealing the conductive portion which is constructed similarly to the sealing conductive portions S are connected in the same manner as described above.

According to the above embodiment, the inner lead rod holding cylinder 6 arranged between the outer periphery of the inner lead rod 4 and the inner periphery of the sealing tube portion 81 of the sealing body 8 is provided on the metal plate 3 side. One end face 61
Has an outer diameter substantially the same as the diameter of the metal plate 3.
One end 65 following 61 has a tapered shape with a gradually increasing diameter.
This one end 65 is followed by a large-diameter cylindrical body 6
2 is formed, so that the conductive portion S for sealing is sealed in a tubular portion.
If the sealing material is inclined in the axial direction when it is arranged in the composite material, the degree of the inclination is small. As a result, in the step of connecting the sealing conductive portion S and the sealing tube portion 81, the metal foil 2
Can be prevented from being disconnected.

Further, since the outer diameter of the one end face 61 of the inner lead rod holding cylinder 6 on the side of the metal plate 3 is substantially the same as the diameter of the metal plate 3, the tapered outer peripheral surface of the glass member 1 is formed. Further, the sealing pipe portion 81 can be welded along the tapered outer peripheral surface of the inner lead rod holding cylinder 6.

Since the other end surface 63 of the inner lead rod holding cylinder 6 on the side of the light emitting space surrounding portion 82 has a slash-shaped recess 64, the inner lead rod holding cylinder 6 is formed in the sealing tube portion 81 . On the light emitting space surrounding portion 82 side of the portion facing the cylindrical body 6, the sealing tube portion welded to the internal lead rod holding cylindrical body 6 even when heated with a smaller amount of heat than the outer end side.
81 can be formed, as a result, to form a deformed portion emission space surrounding portion 82 side end portion of the portion located on the outer periphery of the inner lead pin cylindrical retaining member 6 in the sealed tube portion 81
Is prevented.

Although the 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 glass member 1 is not limited to a columnar shape, but is appropriately selected according to the number of metal foils 2 to be used, and may be, for example, an octagonal column, a hexagonal column, or the like. Further, the other end 22 of the metal foil 2 may be directly connected to the outer periphery of the external lead bar 5 without using the metal member 51.

The hermetically sealed structure described above can be used for other lamps requiring a large current.

[0036]

[Effects of the Invention] As described above, according to the present invention,
Provided is a discharge lamp capable of obtaining a long service life without a metal foil being cut in a sealing step of a sealing tube portion even in a case of a large current without causing an accident of a glass portion of the sealing tube portion. be able to.

[Brief description of the drawings]

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

FIG. 2 is an explanatory view showing an example of an internal lead rod holding cylinder.

FIG. 3 is an explanatory diagram illustrating an example of a metal foil.

FIG. 4 is an explanatory vertical sectional front view showing a configuration of a conventional discharge lamp having a foil seal structure.

FIG. 5 is an explanatory diagram showing a conventional discharge lamp having a foil seal structure in which a conductive portion for sealing is arranged in a sealing tube portion of a sealing body.

FIG. 6 is an explanatory view showing a deformed portion of a sealing tube portion generated in a conventional discharge lamp having a foil seal structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Glass member 11 One end surface 12 Other end surface 13 Hole 16 Peripheral wall 2 Metal foil 21 One end 22 Other end 3 Metal plate 4 Internal lead rod 41 Stopper 5 External lead rod 51 Metal member 6 Internal lead rod holding cylinder 61 One end surface 62 Body 63 Other end surface 64 Recess 65 One end 66 Outer peripheral edge of other end surface 7 External lead rod holding cylinder 8 Seal 81 Sealing tube 82 Light emitting space surrounding portion 9 Electrode A Arc-shaped concave portion B Bottom wall D Outer diameter d Outer diameter of one end surface H Deformed part K Narrowed part L Oblique part S Sealing conductive part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01J 61/36

Claims (2)

(57) [Scope of request for utility model registration] 1. A glass enclosure comprising a light emitting space surrounding portion and a sealing tube portion following the light emitting space surrounding portion, a columnar glass member disposed inside the sealing tube portion of the sealing member, and the light emission of the glass member. A metal plate disposed on one side facing the space surrounding portion side; an internal lead rod having a base end fixed to the metal plate and a distal end arranged to extend into the light emitting space surrounding portion; An electrode provided at the tip, a glass internal lead rod holding cylinder disposed between the outer periphery of the internal lead rod and the inner periphery of the sealing tube of the sealing body, and the sealing of the glass member An external lead rod disposed on the other side facing the outer end side of the tube, extending along the outer periphery of the glass member, one end of which is connected to a metal plate, and the other end of which is electrically connected to the external lead rod; it and a connected metal foil, the internal Lee Stick cylindrical retaining body is diameter substantially the same outer diameter of the metal plate at one end face of the metal plate side, the formation of tapered one end following the end surface is gradually larger diameter
A cylindrical body is not formed following this one end.
A discharge lamp having an outer periphery welded to an inner periphery of the sealing tube portion . Wherein the internal lead rod cylindrical retaining body, the discharge lamp according to claim 1, characterized in that it comprises a cone-shaped recess on the other end surface of the emission space surrounding portion side.