JP2004095494A - Short arc type ultra high pressure discharge lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cause no damage to a part of a side-tube contacted with an external lead rod during work to connect the external lead rod and a feeder wire, and improve the reliability of a connected part of a caulking member connected to the feeder wire and the external lead rod, in a short arc type ultra high pressure discharge lamp having a very high mercury vapor pressure at lighting. <P>SOLUTION: The external lead rod extending out from the side-tube is buried in one side-tube of side-tubes extending from both sides of an arc tube. The caulking member caulked previously to the feeder wire connected electrically to an external circuit is welded to the external lead rod. The caulking member is composed of nickel or a material containing nickel. The external lead rod and the caulking member are so welded that the longitudinal direction of the external lead rod and that of the caulking member intersect. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an ultra-high pressure discharge lamp containing mercury. In particular, the present invention relates to a short arc type ultra-high pressure discharge lamp used as a light source for a large-screen projection device such as a liquid crystal projector or a digital micromirror device projector.
[0002]
[Prior art]
The liquid crystal projector is required to project an image having a uniform color rendering property on a screen. As a light source lamp, a short arc type ultra-high pressure mercury lamp having high brightness in addition to a point light source is used.
[0003]
Such a lamp is filled with mercury in an amount calculated so that the mercury vapor pressure at the time of operation becomes 150 atmospheres or more. By increasing the vapor pressure of mercury, the spread of the arc is suppressed and the luminance is improved.
[0004]
FIG. 5 shows a lamp unit 21 in which the lamp 11 and the reflector 12 are combined. The reflector 12 has a front opening 13 on the emission direction 16 side. One side tube 2a of the lamp 11 is arranged on the front opening 13 side (outgoing direction 16 side) of the reflector, and the other side tube 2b is fixed to the reflector 12. A front glass 15 is attached to the opening 13 in order to prevent glass fragments from scattering at the time of lamp rupture. A power supply line 6 is electrically connected to the external lead rod 5 of the side tube 2a located on the opening 13 side. This connection is made by spot welding the ends of the external lead bar 5 and the power supply line 6 as shown in FIG. The power supply line 6 extends through the power supply line opening 14 provided in the reflector 12 to the outside of the reflector 12 and is electrically connected to an external circuit (not shown).
[0005]
Since the connecting portion 7 between the external lead rod 5 and the power supply line 6 is formed by spot welding, the area is small. Therefore, when a stress is applied to the power supply line 6, the power supply line 6 easily comes off the external lead rod 5. In particular, when assembling the lamp unit 21, it is necessary to pass the power supply line 6 through the power supply line opening 14 provided in the reflector 12, so that stress is easily applied to the power supply line 6 and the power supply line 6 comes off. It was often.
[0006]
Such a problem is solved, for example, by the technology described in JP-A-2001-345069. In this technique, the external lead rod 5, the power supply line 6, and the caulking member are swaged to make the external lead rod 5 and the power supply line 6 multi-point contact, thereby increasing the area of the connection portion 9. Thereby, the mechanical strength of the connecting portion 9 is improved. Specifically, as shown in FIG. 7, the external lead bar 5 and the power supply line 6 are inserted into the internal space of the caulking member 8, and a stress is applied from the outside of the caulking member 8 in the direction of the arrow, and the caulking member is attached. By tightening, the external lead bar 5 and the power supply line 6 are connected.
[0007]
However, in the caulking operation, when an external stress is applied to the caulking member 8, this stress is transmitted to the side pipe 2 through the external lead rod 5, and the external lead rod 5 of the side pipe 2 contacts. May be damaged. For this reason, it is very difficult to caulk so as not to damage the side tube portion 2.
[0008]
[Patent Document 1]
JP-A-02-148561 [Patent Document 2]
JP-A-2001-345069 (page 5, FIG. 2)
[0009]
[Problems to be solved by the invention]
In the short arc type ultra-high pressure discharge lamp with extremely high mercury vapor pressure at the time of operation, the part of the side tube that is in contact with the external lead rod is not damaged when connecting the external lead rod and the power supply line. Another object of the present invention is to improve the reliability of the connecting portion between the caulking member preliminarily caulked on the power supply line and the external lead rod.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the short arc type ultra-high pressure discharge lamp of the present invention has an external lead rod buried outside extending from a side tube formed so as to extend on both sides of the light emitting portion, and is externally embedded. A caulking member previously caulked to a power supply line electrically connected to the circuit and the external lead bar are welded.
Further, the caulking member is made of nickel or a material containing nickel.
Further, the outer lead bar and the caulking member are welded so that, at the time of welding them, the longitudinal axis of the outer lead bar and the caulking member intersect.
[0011]
[Action]
According to the present invention, when connecting the external lead rod and the power supply line, the caulking member and the external lead rod are so arranged that the longitudinal axis of the caulking member preliminarily caulked to the power supply line and the longitudinal axis of the external lead rod intersect. Is welding.
[0012]
Accordingly, since the external lead bar and the caulking member are not directly caulked, no stress is transmitted to the side tube portion through the external lead bar, so that the portion of the side tube portion that is in contact with the external lead bar can be prevented from being damaged. .
Also, compared to the conventional configuration in which each end of the external lead rod and the power supply line are spot-welded, a part of the outer periphery of the external lead rod is partially Since welding is performed, the area of the connection portion can be increased. Furthermore, since the external lead rod and the caulking member are welded so as to intersect, the area of the connection portion can be further increased. That is, as described later, the reliability of the connection portion can be improved.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a schematic configuration of a short arc type ultra-high pressure discharge lamp according to the present invention. Side tube portions 2 are formed so as to extend on both sides of the light emitting portion 1. A pair of electrodes 3 are arranged in the light emitting section 1 so as to face each other, a metal foil 4 connected to the electrodes 3 is sealed by the side tube section 2, and an external lead bar 5 is connected to the metal foil 4. I have.
[0014]
Mercury, a rare gas, and a halogen gas are sealed in the light emitting unit 1. Mercury is sealed in order to obtain a visible light wavelength, for example, radiation light having a wavelength in the range of 360 to 780 nm, and a quantity calculated so that the mercury vapor pressure at the time of lighting exceeds 150 atm. The rare gas is sealed to improve the lighting startability, and the halogen gas is sealed to prevent clouding of the arc tube.
[0015]
The configuration of the external lead bar 5 and the connection portion 10 of the power supply line 6 according to the present invention will be described with reference to FIG. The caulking member 8 and the external lead bar 5 are welded so that the longitudinal axis A of the caulking member 8 previously caulked to the power supply line 6 and the longitudinal axis B of the external lead bar 5 intersect.
Numerical examples of the external lead rod 5 and the power supply line 6 will be introduced. The external lead rod 5 has a diameter of 0.8 mm and a length of 7 mm. The power supply line 6 has a diameter of 0.4 mm and a length of 120 mm.
[0016]
Here, a method of connecting the external lead bar 5 and the power supply line 6 will be specifically described with reference to FIG. First, as shown in a), the caulking member 8 is a cylindrical member having a space inside, and the power supply line 6 is inserted into the internal space. Next, as shown in (b), a stress is applied from the outside of the caulking member 8 in the direction of the arrow, and the caulking member 8 is caulked on the power supply line 6. Finally, as shown in (c), the caulking member 8 caulked to the power supply line 6 and the external lead bar 5 are welded.
[0017]
When the external lead bar 5 and the power supply line 6 are connected in such a manner, since the external lead bar 5 and the caulking member 8 are not directly caulked, no stress is transmitted to the side tube portion 2 through the external lead bar 5. Thereby, it can prevent that the part which contacts the external lead bar 5 among the side tube parts 2 is damaged.
Also, as shown in FIG. 2, the connecting portion 10 is formed by welding a part of the outer periphery of the external lead rod 5 to the caulking member 8 caulked in a substantially planar shape. 6, the area is larger than that of the connection portion 7 formed by the conventional method of spot welding the ends of the external lead rod 5 and the power supply line 6 to each other.
Further, as described above, since the welding is performed so that the longitudinal axis A of the caulking member 8 and the longitudinal axis B of the external lead bar 5 intersect, the area of the connecting portion 10 is further increased. The caulking member 8 is usually cylindrical and has a longitudinal axis A in the tube axis direction. If the caulking member 8 and the external lead bar 5 are welded so that the longitudinal axis A of the caulking member 8 and the longitudinal axis B of the external lead bar 5 overlap, the area of the connecting portion 10 is maximized. However, when assembling a lamp unit 21 shown in FIG. 4 described below, the caulking member 8 may come into contact with the front glass 15, and thus performing such welding is not preferable in terms of the reliability of the connection portion 10. .
[0018]
By increasing the area of the connection portion, the mechanical strength of the connection portion is improved, and the electrical connection is not incomplete. Furthermore, since the contact resistance can be reduced, even if a large current, for example, a current of 3.0 to 5.0 A flows through the lamp, it is possible to suppress a rise in the temperature of the connection portion when the lamp is turned on. For this reason, the reliability of the connection can be improved.
In addition, even if a large current is applied to the lamp, the temperature rise can be suppressed for the above-described reason, so that a point light source lamp with a reduced arc length can be manufactured.
[0019]
Here, the caulking member 8 will be described. The caulking member 8 used in the present invention is a cylindrical shape having a space inside before plastic deformation, but is not limited to this shape. For example, a C-shaped shape, a U-shaped shape, or other shapes It does not matter.
The material constituting the caulking member is preferably excellent in oxidation resistance because the location where the caulking member is located is a place where heat is likely to be generated due to the contact resistance of light or current of the lamp, for example, nickel is preferable. Applicable. In addition, for example, a material containing nickel such as a copper nickel alloy or a manganese nickel alloy can also be used.
To give a numerical example of the caulking member 8, the outer diameter is 0.6 mm, the inner diameter is 0.5 mm, and the length is 3 mm.
[0020]
Here, numerical examples of the short arc type ultra-high pressure discharge lamp of the present invention will be introduced.
Maximum diameter of anode: 1.8mm
Anode length: 10.5mm
Outer diameter of cathode: 1.3 mm
Cathode length: 9.5mm
Distance between electrodes: 1.2mm
Metal foil width: 2mm
Metal foil length: 18mm
Outer diameter of side tube: 5.8 mm
Side tube length: 22mm
Lamp length: 70mm
Inner volume of arc tube: 0.1cc
Amount of enclosed mercury: 250mg
Rated lighting voltage: 80V
Rated lighting current: 2.5A
Rare gas: Argon 100 Torr
[0021]
The short arc type ultra-high pressure discharge lamp described above can be combined with a reflector to form a lamp unit. FIG. 4 is a sectional view of a lamp unit 21 in which the lamp 11 according to the embodiment of the present invention is incorporated.
[0022]
In the lamp unit 21, one side tube 2 a of the lamp 11 is arranged on the side of the opening 13 of the reflector (on the emission direction 16 side), and the other side tube 2 b is fixed to the reflector 12. The reflector 12 has an opening 13 on the emission direction 16 side. A front glass 15 is attached to the opening 13. The external lead bar 5 extending from the side tube portion 2a disposed on the opening 13 side (outgoing direction 16 side) of the reflector is welded to the caulking member 8 to which the power supply line 6 is connected. The power supply line 6 extends through the power supply line opening 14 of the reflector 12 to the outside of the reflector, and is electrically connected to an external circuit (not shown).
[0023]
The power supply line opening 14 through which the power supply line 6 passes is provided at a position where excessive tension is not applied to the power supply line 6 connected to the external lead rod 5 via the caulking member. In addition, the power supply line opening 14 must be provided at a position where the optical characteristics of the lamp are not adversely affected.
[0024]
The other side tube portion 2b protrudes from the top 17 (center hole) of the reflector 12, and is supported by the reflector 12 via an adhesive. A base 18 is attached to an end of the side tube 2b.
[0025]
As described above, the short arc type ultra-high pressure discharge lamp of the present invention, in the work of connecting the external lead rod and the power supply line, the caulking member previously caulked to the power supply line, the external lead rod is welded, The portion of the side tube that is in contact with the external lead rod is not damaged, and the reliability of the connection between the external lead rod and the power supply line can be improved.
[0026]
【The invention's effect】
According to the short arc type ultra-high pressure discharge lamp of the present invention, in the operation of connecting the external lead rod and the power supply line, the caulking member previously caulked to the power supply line and the external lead rod are welded, so that the side tube portion is Of these, the portion that is in contact with the external lead rod is not damaged, and the reliability of the connection between the external lead rod and the power supply line can be improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a short arc type ultra-high pressure discharge lamp.
FIG. 2 is a partially enlarged view of a connecting portion 10 of the present invention.
FIG. 3 is a diagram illustrating a method for connecting an external lead rod and a power supply line according to the present invention.
FIG. 4 is a sectional view showing a configuration of a lamp unit according to the present invention.
FIG. 5 is a cross-sectional view showing a configuration of a conventional lamp unit.
FIG. 6 shows a partially enlarged view of a connection portion 7;
FIG. 7 is a partially enlarged view of a connection portion 9;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Light-emitting part 2 Side tube part 3 Electrode 4 Metal foil 5 External lead rod 6 Power supply line 7 Connection part 8 Caulking member 9 Connection part 10 Connection part 11 Short arc type ultra-high pressure discharge lamp 12 Reflector 13 Front opening part 14 Power supply line opening Part 15 Front glass 16 Emission direction 17 Top (center hole)
18 base

Claims (3)

In a short arc type ultra-high pressure discharge lamp in which an external lead rod extending to the outside from a side tube portion formed to extend on both sides of the light emitting portion is embedded,
A short arc type ultra-high pressure discharge lamp characterized in that a caulking member preliminarily caulked to a power supply line electrically connected to an external circuit and the external lead rod are welded. The short arc type ultra-high pressure discharge lamp according to claim 1, wherein the caulking member is made of nickel or a material containing nickel. The said external lead rod and the said caulking member are welded so that the longitudinal axis of the said external lead rod and the said caulking member may cross | intersect at the time of welding of both. Short arc type ultra-high pressure discharge lamp.

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