JP2000323096A - Discharge lamp, lamp device, lithing device, lighting system, and liquid crystal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce breaking possibility of a blocking body when a discharge lamp is installed in a reflector, by equalizing an outer end of the blocking body fixed to an electrode to an outer end of a luminescent tube, or placing it on an electrode side of the outer end of the luminescent tube. SOLUTION: Inside of a blocking tube 15 connected to both ends of a luminescent tube 11 is blocked by a blocking body 30 made of a tilting function material. Holes are opened from non-conductive and conductive end surfaces 31, 32 of the blocking body 30 to a part having conductivity, core bars 22, 23 of a positive electrode and a negative electrode and an outer lead wire 24 are inserted into them, and the core bars 22, 23 and the outer lead wire 24 are electrically interconnected. A cylindrical alumina-made spacer 25 is inserted between the outer lead wire 24 connected to the conductive side of the blocking body 30 and the blocking tube 15 to reduce a clearance generated in the blocking tube 15. Preferably, the non-conductive end surface 31 of the blocking body 30 is made of about 100% silica and the conductive end surface 32 is made of 70 % silica and 30% molybdenum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp such as a small metal halide lamp having a short arc length and a lamp apparatus and a lighting device using the lamp as a light source, and more particularly to a manufacturing method suitable for a discharge lamp having a short arc length. .

[0002]

2. Description of the Related Art Conventionally, as described in JP-A-10-172514, a closed tube at the end of a discharge vessel is formed of a functionally gradient material composed of a nonconductive material such as silica and a conductive material such as molybdenum. Attention is being paid to discharge lamps that are closed by closed closures.

A closed body made of such a functionally graded material has one end rich in a non-conductive component such as silica, and the other has a continuous ratio of a conductive component such as molybdenum toward the other end. Or gradually.

Accordingly, in the case of a functionally graded material formed of a silica component and a molybdenum component, the vicinity of one end of the closing body is non-conductive and has a coefficient of thermal expansion close to the linear expansion coefficient of quartz glass and the other side. Is electrically conductive and has a characteristic that its thermal expansion coefficient is close to that of molybdenum.

[0005] Such a functionally graded material can increase the gradient at which the ratio between the non-conductive component and the conductive component changes, so that the closure formed of the functionally graded material has a short axial length. Also, the non-conductive component on one end face can be made rich and the conductive component on the other end face can be made rich.

Further, since the functionally graded material does not have a boundary surface in which the composition of the constituents is greatly changed, it is resistant to heat shock, and the sealing portion for welding the closing body to the closing tube can be brought close to the luminous tube which becomes hot at the time of lighting. This has the advantage that the occlusion tube can be shortened.

[0007]

As shown in FIG. 6, in the lamp structure of the prior art, a quartz glass closed tube 1 connected to the end of a quartz glass arc tube 101 is used.
When closing 02 with a closing body 110 formed of a functionally graded material, first, a core rod 111 of an electrode is inserted into the closing body 110, and an end face 112 of the closing body 110 where the non-conductive component of silica is rich is illuminated. The closing body 110 is fitted to the closing tube 102 on the 101 side, and the closing tube 102 near the end face 112 is heated and welded to the closing tube 102.

Incidentally, both end surfaces 113 and 11 of the closing body 110 are provided.
4 to the conductive portions, respectively, and in each hole, the core rod 111 of the electrode and the outer lead wire 11 are formed.
A discharge lamp in which the core rod 111 is electrically connected to the outer lead wire 112 has been put into practical use.

Thereafter, the discharge lamp is accommodated and supported with its lamp axis coinciding with the optical axis, and is mounted on a reflector (not shown) which reflects light emitted from the lamp and projects the light from the front opening. There is a process.

However, in the lamp having the structure shown in FIG. 6, the end 103 of the closed tube 102 is closer to the discharge tube 101 side than the end 115 of the closed body 110. When the lead wire is connected to the outer lead wire 112 by spot welding or the like, or when the reflector and the discharge lamp are aligned, a force acts on the closing body 110 existing outside the closing tube 102 to break the closing body. The problem arose.

In particular, when the outer diameter of the closing body is 2.5 mm or less, the absolute strength of the closing body 110 is insufficient and breakage is remarkably caused.

Further, a closing body 1 formed of a functionally graded material
10 is one in which the non-conductive component of silica is rich at one end, and the ratio of the conductive component of molybdenum continuously changes toward the other end, and the composition of the component is large. Although it does not have a changing mirror interface,
Even when the zero-gradient composition changes continuously, the existence of at least a tensile stress or a compressive stress in the axial direction located at the point of polarization is one cause of the failure.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a discharge lamp that reduces the possibility of breakage of a closed body when the discharge lamp using the closed body is installed on a reflector or the like.

[0014]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a pair of electrodes are disposed opposite to each other in an arc tube made of a non-conductive material, and an end portion of the arc tube is electrically conductive. The plug and the non-conductive component having a coefficient of thermal expansion that is closer to the material of the arc tube than the component and the conductive component are inserted into the inner end of the arc tube. In the hermetically sealed discharge lamp, the outer end of the closed body is equal to the outer end of the arc tube or is located closer to the electrode than the outer end of the arc tube.

According to the present invention, when the discharge lamp is installed on the reflector, when the lead wire is connected to the external electrode by spot welding or when the axis of the reflector and the discharge lamp are aligned, the closing body emits light. Since it is not exposed from the tube, the possibility of breakage of the closing body can be reduced.

In a preferred embodiment, it is preferable that the outer end side of the closing body is configured so that the ratio of the conductive component to the non-conductive component is larger than that of the electrode side. Further, it is preferable to weld the portion of the closed body having a large ratio of the non-conductive component to the arc tube.

According to the present invention, an external electrode is fixed to an outer end of the closing body, and a spacer is inserted into a gap between the closing body and the arc tube outside the outer end of the closing body. It is characterized by the following.

That is, when the outer end of the closing body is closer to the electrode than the outer end of the arc tube, a gap is formed between the outside and the closing tube, and when force is applied from the outside, the closing is performed according to the principle of leverage. External force may concentrate on the sealing portion between the body and the arc tube and damage the closing body, but by inserting the spacer as in the present invention, the external force concentrates on the sealing portion between the closing body and the lighting tube. Can be prevented.

In a preferred embodiment, a reinforcing material is provided for fixing the external electrode and the arc tube. An embodiment of the reinforcing substance is preferably an inorganic adhesive or a resin adhesive.

In another preferred embodiment, the present invention can be applied to a direct current discharge lamp in which a pair of electrodes are an anode and a cathode.

The discharge medium enclosed in the arc tube is a metal halide or a gas of mercury, neon, argon, krypton, xenon, or radon. These discharge mediums may be used alone or in combination. May be. That is, whether the discharge medium is adapted to a metal halide lamp that is a metal halide, the discharge medium is adapted to a mercury lamp that is mercury, or the discharge medium is adapted to a gas discharge lamp that is a gas. .

As the components of the closing member, it is preferable that the conductive component is molybdenum and the non-conductive component is silica.

The above-mentioned discharge lamp is provided with a discharge lamp and a reflector which accommodates and supports the discharge lamp so that the lamp axis coincides with the optical axis, and reflects the light radiated from the lamp and projects the light from the front opening. The present invention can be used for a lamp device.

It is also possible to use the present invention in a lighting device provided with a discharge lamp and a lighting circuit for supplying electric power to a pair of electrodes of the lamp and stably lighting the lighting device. Further, the lighting device and the lighting device are accommodated. An illuminating device having a fixture body, an optical system that controls light from a discharge lamp of the lighting device, a liquid crystal display panel driven by the lighting device and the liquid crystal driving device, and projects the light on a screen through the liquid crystal display panel; The present invention can also be used for a liquid crystal projector that houses a device, a liquid crystal driving device, a liquid crystal display panel, and an optical system, and has an opening for projecting light transmitted through the liquid crystal display panel onto a screen.

[0025]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a lamp according to an embodiment of the present invention. This lamp is
Although a high-pressure mercury discharge lamp with a short arc length for 180 W DC lighting is used, the discharge lamp of the present invention is not limited to this, and may be a discharge lamp such as a metal halide lamp or a xenon lamp. Further, a discharge lamp having a long arc length or an AC lamp may be used.

In FIG. 1, a discharge vessel 1 made of quartz glass is used.
The 0 arc tube 11 has a spherical shape or an elliptical spherical shape, the maximum outer diameter of the elliptical spherical portion is 9 mm, and the internal volume of the discharge space portion 12 is 0.07 cc. Inside the discharge space 12, an anode 20 and a cathode 21 made of tungsten are opposed to each other with an arc length of 1.3 mm. Also, the discharge space 1
2, 150 torr of argon gas and 134 of mercury
0 mg mercury bromide 15 0.03 mg is enclosed.
Then, both ends of the arc tube 11 have an outer diameter of 6.3 mm and an inner diameter of 2.2.
A closed tube 15 of mm is connected to the closed tube 1 (the light emitting tube 11 and the closed tube 15 may be collectively referred to as a light emitting tube).
2 has an outer diameter of 2.1 mm and a length of 2 made of a functionally graded material.
It is closed by a 5 mm closing body 30.

Here, the functionally graded material used is a mixture of a non-conductive component and a conductive component of the same material as the discharge vessel,
For example, when the discharge vessel is made of quartz glass, it is obtained by sintering silica powder and molybdenum powder, and changing the mixing ratio continuously or stepwise in the length direction, making one end non-conductive, The other end is made conductive.

As an example, the non-conductive end face 31 of the closing body 30 is made of almost 100% silica, and the conductive end face 32 is made of silica 70% + molybdenum 30% (volume ratio).
However, the composition ratio is not necessarily limited to this.

Holes are formed from both end surfaces 31 and 32 of the closing body 30 formed of the functionally graded material to conductive portions, respectively, and the core rods 22 and 23 of the electrode and the outer lead wire 24 (external) are formed in the respective holes. Electrodes) are inserted and fixed, whereby the core rods 22, 23 and the outer lead wires 24 can be electrically connected.

The core rod 22 of the anode 20 and the core rod 23 of the cathode 21 and the outer lead wire 24 are made of tungsten. ing.
By filling the cermet, the core rods 22, 23 and the outer lead wire 24 are fixed, and the closing body 3 is closed.
It serves to prevent cracks in the closing body 30 due to the difference in the coefficient of thermal expansion between the zero and the core rods 22 and 23 and the outer lead wire 24, and to improve the reliability of the electrical conduction part.

It is needless to say that the composition of the cermet 31 must be changed to an optimum condition by a combination of the outer diameters of the core rods 22 and 23 and the outer lead wire 24 made of tungsten and the inner diameter of the hole of the closing body 30. .

The outer lead wire 24 connected to the conductive side of the closing body 30 made of a functionally graded material and the closing pipe 1
5, a columnar spacer 25 of alumina is inserted. This alumina spacer has an outer diameter of 2 mm and an inner diameter of 1
A cylindrical member having a length of 2 mm and a length of 2 mm was used. By inserting the columnar spacer 25 into the gap between the closed pipe 15 and the outer lead wire 24, the gap generated inside the closed pipe 15 was reduced.

The reinforcing substance 26 is a ceramic adhesive, and further includes an outer lead wire 24 fixedly connected to the conductive side of the closing body 30 made of a functionally gradient material by a cermet, the closing pipe 15, and a columnar spacer 25. Used when firmly fixing. The reinforcing substance 26 may be used without the columnar spacer 25 in the gap between the outer lead wire 24 and the closed tube 15. Further, the material of the columnar spacer 25 may be metal, glass, or another ceramic material.

As described above, the outer lead wire 25 and the closed pipe 1 are formed by the reinforcing material 26 and the columnar spacer 25.
By filling and fixing the gap between the outer lead wire 24 and the outer lead wire 24, even if a force is generated from the outside, the force is directly
It is possible to eliminate the concentration at the portion where the closed tube 15 and the closed body 30 are welded, and to prevent an impact when the outer lead wire 24 and the outer lead wire 27 are connected by spot welding, and to prevent the reflector (not shown) from being connected to the discharge lamp. In the process of aligning the optical axis and fixing, there is no breakage of the closing body 30.

The performance of the discharge lamp of the present invention described above is as follows: lamp power DC 180 W, lamp voltage DC 85 V,
Arc length 1.3 mm, Zenhikaritabachi 11340Lm, color temperature 10400 ^○ K, a color rendering index 70Ra, mercury lamp performance ultra high pressure was obtained. FIG. 2 shows the spectral distribution of the discharge lamp.

FIG. 3 shows a configuration of an example of a lamp device 40 and a lighting device 41 thereof according to a second embodiment of the present invention. The lamp device 40 accommodates the discharge lamp 10 in a reflector 42 on a bowl, which is a reflector, and concentrically mounts the discharge lamp 10 on a reduced-diameter inner bottom portion.

The reflector 42 is formed in a bowl shape from glass or metal, and a reflection surface 43 made of a deposited film of TiO ₂ —SiO ₂ having excellent reflection characteristics is formed on the inner surface of the rotating curved surface having the focal position. I have. This reflector 42
Has an opening diameter of, for example, about 90 mm, and a front glass 47 for explosion proof is attached to the opening. A support cylinder 44 projects concentrically outward from the outer bottom of the bowl of the reflector 42. In the support tube 44, the closed tube 15 of the discharge lamp 10 is fixed by an adhesive 45 such as insulating cement and an insulating cover 46 made of a material such as alumina. As a result, the discharge lamp 10 is mounted on the reflector 42 such that the axis of the lamp substantially coincides with the axis of the reflector 42.

The discharge lamp 10 comprises an anode 20 and a cathode 2
1 is arranged such that the midpoint between them substantially coincides with the focal position of the reflector 42. An introduction hole 48 is formed in the reflector 42. One lead wire 27 of the discharge lamp 10 penetrates through the introduction hole 48 and is led to the rear side. The leading end of the lead wire 27 is connected to one end of a lighting circuit 49, and the other end of the lighting circuit 49 is connected to the outer lead wire 24 of the discharge lamp 10 via another lead wire 27. Power is stably supplied to the anode 20 and the cathode 21 via the pair of lead wires 27, the outer lead wire 24, and the closing body 30, and the discharge lamp 10
Is lit. Thus, the lighting device 41 is configured.
In addition, the lighting device 41 and a fixture body (not shown) that accommodates the lighting device 41 can be configured as a lighting fixture.

Therefore, the lamp device 40 and the lighting device 4
Since the discharge lamp 10 and the lighting device use the discharge lamp 10 of the present invention as a light source, the reliability of these devices 40 and 41 can be improved.

FIG. 4 shows an example of the configuration of a projector 50 according to the third embodiment of the present invention. The lighting device 41 includes the discharge lamp 10 and supplies power to the discharge lamp 10 to stably turn on the discharge lamp 10. The optical system 52 projects light from the discharge lamp 10 and the reflector 42 to a screen 51. And these discharge lamps 10,
A box 53 containing a reflector 42, a lighting circuit 49, and an optical system 52 is provided. The box 53 has an optical system 5
Window 54 for projecting light from 2 to screen 51
Is opened.

The optical diameter 52 is a condenser lens 55 for condensing light from the discharge lamp 10 and the reflector 42,
The discharge lamp 10 and the reflector 42 have a flat mirror 56, a Fresnel lens 57, a second flat mirror 58, and the like.
From the window 53 of the box 53 to be projected onto the screen 51.

FIG. 5 shows an example of a liquid crystal projector 60 according to a fourth embodiment of the present invention. For example, a liquid crystal display panel 61 of a color or the like and a light projecting lens
2 for projecting a shadow image displayed on the liquid crystal display panel 61 onto a screen 63. The lamp device 40 including the lighting device 41, the liquid crystal display panel 61, and the liquid crystal driving device 64 for driving the liquid crystal display panel 61 are housed in a box 65.

Therefore, the reliability of the liquid crystal projector 60 can be obtained similarly to the discharge lamp 10 described above.

[0044]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a discharge lamp according to a first embodiment of the present invention.

FIG. 2 is a spectral distribution diagram of the discharge lamp according to the first embodiment of the present invention.

FIG. 3 is a partial vertical sectional view of a lamp device according to a second embodiment including the discharge lamp shown in FIG. 1 and a lighting device thereof.

FIG. 4 is a schematic diagram showing an overall configuration of a projector according to a third embodiment including the discharge lamp shown in FIG.

FIG. 5 is a schematic diagram showing a configuration of a liquid crystal projector according to a fourth embodiment including the discharge lamp shown in FIG.

FIG. 6 is a diagram showing a conventional technique.

[Explanation of symbols]

10 discharge lamp, 11 arc tube, 12 discharge space part,
13 ... mercury, 14 ... mercury bromide, 15 ... closed tube, 20 ... anode, 21 ... cathode, 22 ... anode core rod, 23 ... cathode core rod, 24 ... outer lead wire, 25 ... spacer, 26 ...
Reinforcement material, 27 Lead wire, 30 Closed body, 31 Non-conductive end face, 32 Conductive end face, 40 Lamp device, 41 Lighting device, 42 Reflector, 43 Reflecting surface, 44 Support cylinder, 45: adhesive, 46: insulating cover,
48 ... introduction hole, 49 ... lighting circuit, 50 ... projector,
51: screen, 52: optical system, 53: box, 5
4 Window, 55 Condenser lens, 56 First plane mirror, 57 Fresnel lens, 58 Second plane mirror, 60 Liquid crystal projector, 61 Liquid crystal display panel, 62 Projection lens, 63 Screen , 64: liquid crystal drive, 65: box

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (12)

[Claims] An arc tube made of a non-conductive material is provided with a pair of electrodes opposed to each other, and an end portion of the arc tube has a conductive component and a material of the arc tube in comparison with the conductive component. A non-conductive component having a coefficient of thermal expansion close to that of the non-conductive component is inserted, and a closing member is inserted at the inner end side and the outer electrode is fixed at the outer end side. In a discharge lamp which is hermetically sealed, the outer end of the closing body is equal to the position of the outer end of the arc tube or is located closer to the electrode than the outer end of the arc tube. . 2. The discharge lamp according to claim 1, wherein a ratio of a conductive component to a non-conductive component is larger at an outer end side of the closing body than at the electrode side. 3. An external electrode is fixed to an outer end of the closing body, and a spacer is inserted into a gap between the closing body and the arc tube outside the outer end of the closing body. The discharge lamp according to claim 1, wherein the discharge lamp comprises: 4. The discharge lamp according to claim 1, further comprising a reinforcing substance for fixing the external electrode and the arc tube. 5. The discharge lamp according to claim 4, wherein the reinforcing substance is an inorganic adhesive or a resin adhesive. 6. The discharge lamp according to claim 1, wherein said pair of electrodes are an anode and a cathode. 7. The discharge medium sealed in the arc tube is a metal halide, mercury, or a gas of neon, argon, krypton, xenon, or radon. These discharge mediums may exist alone or in combination. The discharge lamp according to any one of claims 1 to 6, wherein: 8. The conductive component of the closing body is molybdenum,
2. The non-conductive component is silica.
8. The discharge lamp according to any one of claims 7 to 7. 9. The discharge lamp according to claim 1, wherein the lamp axis is accommodated and supported in a state where the lamp axis coincides with the optical axis, and the light radiated from the lamp is reflected so as to be reflected from the front opening. A lamp device comprising a reflector for projecting light. 10. A lighting device comprising: the discharge lamp according to claim 1; and a lighting circuit that supplies power to a pair of electrodes of the discharge lamp and stably lights the discharge lamp. 11. A lighting device, comprising: the lighting device according to claim 10; and a fixture main body that houses the lighting device. 12. An optical system for controlling a light from a discharge lamp of the lighting device, a liquid crystal display panel driven by the liquid crystal driving device, and a discharge lamp of the lighting device, and projecting the light on a screen through the liquid crystal display panel. Device, liquid crystal drive,
A liquid crystal projector containing a liquid crystal display panel and an optical system, and having an opening for projecting light transmitted through the liquid crystal display panel onto a screen.