JP2729640B2 - Metal halide discharge lamp - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a metal halide discharge lamp.

BACKGROUND OF THE INVENTION Mercury and a metal halide, for example, a compound of a metal such as Na, Tl, Th, In, Sn, Si, Sc, Dy, Ho, Tm and a halogen such as iodine or bromine are placed in a quartz arc tube. The enclosed metal halide discharge lamp is used as a discharge lamp having excellent color rendering properties and efficiency.

A conventionally known arc tube of a metal halide discharge lamp is, for example, as shown in FIG. In FIG.
The arc tube 61 is made of quartz, and a mercury and a metal halide are charged into a high-vacuum arc tube portion 62, and a gas such as argon is further sealed.Each end of the arc tube portion 62 has a discharge electrode. A rod 63 is provided, one end of the discharge electrode rod 63 is welded to a molybdenum foil 64, a lead wire 65 is welded to the other end of the molybdenum foil 64, and the molybdenum foil 64 is sealed to the quartz S
To form a sealing portion 66. And
The sealing portion 66 is a sectional view taken along the line AA in FIG.
As shown in the figure, the cross section is formed in a substantially circular shape.

The arc tube 61 shown in FIG. 6 is manufactured from the arc tube product 71 shown in FIG. 8, for example, as follows. That is, in FIG. 8, the arc tube intermediate product 71 includes an arc tube portion 72.
A tube 73 for forming a sealing portion is provided at both ends of the tube, an exhaust tube 74 is provided at the center of the arc tube portion 72, and a discharge tube is provided at one end inside the tube 73 for the sealing portion. A molybdenum foil 64 to which the electrode rod 63 is welded and the lead wire 65 is welded to the other end is inserted, and a part of the discharge electrode rod 63 is protruded into the arc tube part 72 to be welded to the sealing part tube 73 at the welding part 75. It is fixed. First, the exhaust pipe 74 is evacuated to make the inside of the arc tube intermediate product 71 a high vacuum, and the exhaust pipe 74 is sealed. Then, the sealing tube 73 is heated and melted, as shown in FIGS. 6 and 7. The sealing portion 66 is formed as described above. Then the exhaust pipe
After cutting the sealed part of 74, the inside of the arc tube part 72 is evacuated to a high vacuum, then mercury and metal halide are put into the arc tube part, a gas such as argon is sealed, and the exhaust tube 74 is sealed and removed. Thus, the arc tube 61 is manufactured.

In the known method for manufacturing a metal halide arc tube as described above, an extra operation is required because the inside of the arc tube intermediate product 71 must be made to have a high vacuum when the sealing portion 66 is formed. It takes a very long time and a skilled technique to form 66, and since the cross-sectional shape of the sealing portion 66 is circular as shown in FIG. It is difficult to dissipate the heat of the foil 64, and it is about
There is a problem that the temperature must be 400 ° C. or lower, and the sealing portion 66 must be lengthened for that purpose. Especially for metal halide discharge lamps with high luminous flux and high current, the sealing part
66 would have to be very long, resulting in wasted resources and increased costs.

[Object of the Invention] The present invention can shorten the sealing portion in the case of a metal halide discharge lamp having the same luminous flux (current consumption) as compared with a conventionally known one, has a small number of operation procedures, and is easy in a short time. It is an object to provide an excellent metal halide discharge lamp that can be manufactured.

According to the present invention, a discharge electrode rod is protruded into an arc tube at the end of a quartz arc tube enclosing mercury and metal halide, and the discharge electrode bar and a lead wire are joined via a conductive portion; In a metal halide discharge lamp having a sealing portion sealed by quartz, the conductive portion is formed by welding a first molybdenum foil to one end of a discharge electrode rod and connecting one end of a conductive material to the other end of the first molybdenum foil. Welded, one end of a second molybdenum foil is welded to the other end of the conductive material, and a lead wire is formed by welding the other end of the second molybdenum foil, and the sealing part is at least the conductive part. The portion containing the first molybdenum foil and the portion containing the second molybdenum foil are sealed by softening and crushing of the sealing quartz, and the conductive material between the two molybdenum foils is used for sealing the quartz tube of the sealing portion. Characterized by being suspended inside Metal halide discharge lamps.

DETAILED DESCRIPTION OF THE INVENTION The metal halide discharge lamp of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an example of an arc tube of a metal halide discharge lamp of the present invention.

In FIG. 1, the arc tube 1 is made of quartz,
Mercury and metal halide are put in the arc tube part 2 which is made high vacuum, and a gas such as argon is further sealed. Discharge electrode rods 3 are provided at both ends of the arc tube part 2, respectively. One end is welded to the first molybdenum foil 41,
One end of the conductive material 6 is welded to the other end of the first molybdenum foil 41, one end of the second molybdenum foil 42 is welded to the other end of the conductive material 6, and the lead wire 5 is connected to the other end of the second molybdenum foil 42. Are welded to form a conductive portion, and the first molybdenum foil of the conductive portion
The portion including the portion 41 and the portion including the second molybdenum foil 42 are sealed by softening and crushing of the sealing portion quartz, and the conductive material 6 between the two molybdenum foils is sealed in the sealing portion quartz tube T. And a sealing portion 7 is formed.

The conductive material 6 is made of a material having a relatively small electric resistance such as copper, nickel, molybdenum, and stainless steel, and has an arbitrary shape such as a round bar wire, a stranded wire, or a plate. It is.

FIG. 2 is a side view showing one sealing portion 7 of the arc tube of the metal halide discharge lamp shown in FIG. 1, and FIG. 3 is an enlarged sectional view taken along line BB in FIG. FIG. 4 is an enlarged sectional view taken along line CC in FIG.

In FIGS. 1 to 4, the sealing portion 7 is an area P1 centered on a portion W1 including the molybdenum foil 41 to which the electrode rod 3 and the conductive material 6 are welded. Sealed. As shown in FIG. 3, the section W1 including the molybdenum foil 41 is sealed by the sealing portion quartz S, and the electrode rod 3 and the conductive material 6
The middle part in the lateral direction to the direction connecting
Are flattened portions 11, 11 formed by crushing at two locations during heat softening, and the substantially flat portions 11, 11 extend in a direction connecting the electrode rod and the conductive material. Also, the sealing portion 7
Quartz softened due to the crushing of the intermediate portion protrudes from the crushed portion at the both ends in the lateral direction of the section P1 and bulges 1
2, 12 are formed, and further, in the center of the area P1,
The ribs 13 are formed by swelling in the same manner as the intermediate portion is crushed.

In addition, the sealing portion 7 has an area centered on the portion W2 including the molybdenum foil 42 to which the conductive material 6 and the lead wire 5 are welded.
At P2, the sealing portion quartz S is sealed by softening and crushing.
As shown in FIG. 4, the section W2 including the molybdenum foil 42 in the section P2 along the line CC in FIG. An intermediate portion in the lateral direction with respect to the joining direction is a substantially flat plate portion formed by crushing the sealing portion quartz S at one place during heating and softening.
The swelled portions 15 and 15 are formed at both ends in the lateral direction by squeezing the quartz softened due to the crushing of the intermediate portion from the crushed portion.

Further, the conductive material 6 whose both ends between the above-mentioned sections P1 and P2 are welded to the molybdenum foils 41 and 42 has a sealing portion quartz tube T
It is suspended inside. The sealing portion quartz tube T is filled with an inert gas such as nitrogen containing no oxygen.

Area P1 may have a cross-sectional shape as shown in FIG. 4, and area P2 may have a cross-sectional shape as shown in FIG.

In addition, in FIGS. 3 and 4, the substantially flat plate portion 11 may be formed so as to become thicker toward the center of the sealing portion.

The size of the substantially flat portion 11, the bulging portion 12, and the rib portion 13 can be arbitrarily set according to the size of the metal halide discharge lamp.

The arc tube 1 shown in FIG. 1 is manufactured from the arc tube intermediate product 21 shown in FIG. 5, for example, as follows. That is, in FIG. 5, the arc tube intermediate product 21 includes an arc tube portion 22.
A tube 23 for forming a sealing portion is provided at both ends of the tube, an exhaust tube 24 is provided at the center of the arc tube portion 22, and a discharge electrode rod is provided in the tube 23 for the sealing portion. 3 is welded to the first molybdenum foil 41, one end of the conductive material 6 is welded to the other end of the first molybdenum foil 41, and one end of the second molybdenum foil 42 is welded to the other end of the conductive material 6. Then, a conductive part formed by welding the lead wire 5 to the other end of the second molybdenum foil 42 is inserted, and a part of the discharge electrode rod 3 is protruded into the arc tube part 22 so that the discharge electrode rod 3 and / or Alternatively, a part of the lead wire is temporarily fixed to the sealing portion tube 23.

The arc tube intermediate product 21 is set so that the two sealing portion tubes 23, 23 are positioned in a vertical relationship, and while blowing an inert gas, for example, nitrogen gas into the arc tube intermediate product 21,
A portion of the sealing portion tube 23 corresponding to the portion W2 including the molybdenum foil 42 is heated and softened by, for example, an oxygen-hydrogen flame,
In FIG. 2, the portion for forming 14 is sandwiched between the upper and lower sides (in the actual operation, on both the left and right sides) by crushing members and crushed, and the entire area including the portion W2 is sealed with quartz of the sealing portion tube 22. At this time, a substantially flat portion 14 is formed in a portion where the crushing member hits, and a softened quartz protrudes in a portion where the crushing member does not touch, and bulging portions 15 and 15 rounded by the surface tension.
Is formed. Thus, the area P2 of the sealing portion 7 as shown in FIGS. 1 and 2 is formed.

Next, while blowing the inert gas into the arc tube intermediate product 21 in the same manner as described above, the area of the sealing portion tube 23 corresponding to the portion W1 including the molybdenum foil 41 is heated and softened by, for example, an oxygen-hydrogen flame, The portions (two places) where the substantially flat plate portion 11 is formed are sandwiched between the crushing members in the same manner as described above, and crushed.
The surrounding area including the portion W1 is sealed with quartz of the sealing member tube 22. At that time, the portion hit by the crushing member has a substantially flat plate portion 11, and the portion not hit by the crushing member has softened quartz protruding and bulging portions 12 and 12 and rib portions 13 and 13 which are rounded by the surface tension. Is formed. Thus, the area P1 of the sealing portion 7 as shown in FIGS. 1 and 2 is formed.

And as a result, the pipe for the sealing portion between the area P1 and the area P2
The area T of 23 remains almost undeformed, and the quartz tube in the area T is filled with an inert gas and the conductive material 6 is suspended.

A method and apparatus for heating and softening a quartz sealing tube to form a sealed portion by crushing and crushing the tube are known in the manufacture of incandescent lamps such as halogen lamps, and manufacture the metal halide discharge lamp of the present invention. In the formation of the sealing portion when
Known techniques such as those described above can be used as appropriate.

The formation of the zone P1 and the zone P2 may be opposite to the above-described order, and the zone P1 may be formed first, then the zone P2 may be formed, or the zone P1 and the zone P2 may be formed simultaneously.

Then, after evacuation from the exhaust pipe 24 to make the inside of the arc tube part 22 a high vacuum, mercury and metal halide are put into the arc tube part 22, gas such as argon is further added, and the exhaust tube 24 is sealed off to emit light. The tube 1 is manufactured. A metal halide discharge lamp is manufactured by using the arc tube manufactured as described above and appropriately attaching a base.

The metal halide discharge lamp of the present invention is the same as a conventionally known metal halide discharge or the like, except that the sealing portion has the specific shape as described above. For example, a metal halide, a discharge electrode rod, a molybdenum foil, a lead For the material and size of the wire, the quartz tube, and the like, and the method of manufacturing portions other than the sealing portion, materials, manufacturing methods, and manufacturing conditions known per se for the metal halide discharge lamp can be appropriately used.

[Effect of the Invention] Since the metal halide discharge lamp of the present invention has the sealing portion formed as described above, the calorific value in the sealing portion is smaller than that of the conventionally known metal halide discharge lamp, In addition, there is an effect that a large amount of heat is dissipated, so that the length of the sealing portion can be made shorter than that of a conventionally known metal halide discharge lamp.

Further, when manufacturing the metal halide discharge lamp of the present invention, in some cases, it is not necessary to apply a high vacuum to the arc tube when forming the sealing portion, and the softened quartz in the sealing portion is crushed and sealed. Since the stop portion is formed, a remarkable effect that the sealing portion can be easily formed in a short time is achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an arc tube of the metal halide discharge lamp of the present invention, and FIG. 2 is a side view showing one sealing portion 7 of the arc tube of the metal halide discharge lamp shown in FIG. FIG. 3 is an enlarged sectional view taken along line BB in FIG. 2, FIG. 4 is an enlarged sectional view taken along line CC in FIG. 2, and FIG. FIG. 6 is a cross-sectional view showing an arc tube intermediate product for manufacturing the arc tube shown in FIG. 6, FIG. 6 is a plan view showing an example of an arc tube of a known metal halide discharge lamp, and FIG. FIG. 8 is a sectional view taken along line AA, and FIG. 8 is a sectional view showing an arc tube intermediate product for manufacturing the arc tube shown in FIG. 1: arc tube, 2: arc tube portion, 3: discharge electrode rod, 41: first molybdenum foil, 42: second molybdenum foil, 5: lead wire, 6: conductive material, 7: sealing portion, 11 : Substantially flat part, 12: Bulging part, 13: Rib part, 14: Substantially flat part, 15: Bulging part, 21: Arc tube intermediate product, 22:
Arc tube part, 23: tube for sealing part, 24: exhaust tube, 61: arc tube, 62:
Arc tube part, 63: discharge electrode rod, 64: molybdenum foil, 65: lead wire, 66: sealing part, 71: arc tube intermediate product, 72: arc tube part, 7
3: Tube for sealing part, 74: exhaust pipe, 75: welded part, S: quartz for sealing part,
W1: a portion including the molybdenum foil 41, W2: a portion including the molybdenum foil 42.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 47-4779 (JP, U) Japanese Utility Model 16-18965 (JP, Y1) Japanese Patent Publication 54-36431 (JP, B2)

Claims (1)

(57) [Claims] 1. A discharge electrode rod is protruded into an end of a quartz arc tube in which mercury and metal halide are sealed, and the discharge electrode bar and a lead wire are joined via a conductive portion and sealed by quartz. In a metal halide discharge lamp having a sealed portion, the conductive portion has a first molybdenum foil welded to one end of a discharge electrode rod and one end of a conductive material welded to the other end of the first molybdenum foil. One end of a second molybdenum foil is welded to the other end of the conductive material and a lead wire is welded to the other end of the second molybdenum foil, and the sealing portion is at least the first molybdenum of the conductive portion. The portion containing the foil and the portion containing the second molybdenum foil are sealed by softening and crushing of the sealing quartz, and the conductive material between the two molybdenum foils is suspended in the sealing quartz tube. Metal characterized by being formed by Ride discharge lamp.