JPH10106498A - High pressure discharge lamp, lamp device, lighting device, lighting system and liquid crystal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To endure a lighting condition of a high load without reducing lamp efficiency, and improve reliability by setting a height of an exhaust tip in a specific height in a metal halide lamp having the small content unit volume of a discharge space part. SOLUTION: An exhaust tip 8 is protrusively arranged on an outside surface of a hollow elliptic circular sphere-shaped discharge space part 2a, and after the inside of the space part 2a is exhausted through a thin diameter exhaust pipe protrusively arranged on the outside surface of the space part 2a, a discharge medium such as metallic halide is also introduced into the space part 2a through the tip 8. For example, in a metal halide lamp on which the content unit volume of the space part is 0.4 to 2.3cc, a height of its tip 8 is set to 2 to 6mm. Therefore, even when this lamp is lighted in a high tube wall load not less than 40W/cm<2> , lamp efficiency is hardly reduced, and damage such as a crack is nor caused in an airtight vessel. Therefore, reliability sufficiently endurable to high load lighting can be improved without practically reducing the lamp efficeincy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high pressure discharge lamp such as a small metal halide lamp of a short arc type or the like, a lamp device using the lamp as a light source, a lighting device, a lighting device, and a liquid crystal projector.

[0002]

2. Description of the Related Art Conventionally, metal halide lamps have been widely used mainly for sports lighting and the like due to their high color rendering properties and high efficiency. In particular, in recent years, a short arc type metal halide lamp having a short arc length is close to a point light source, and a large amount of light is obtained for the power.
That is, because of its high luminous efficiency, it is often used as a light source for OHP (overhead projector) or floodlighting.

Conventionally, in a metal halide lamp of this type, when a bulb, which is a hermetic container for accommodating a pair of electrodes, is made of glass such as quartz glass, a small exhaust gas is provided on the outer surface of a discharge space, for example, a hollow elliptical sphere. Chips are protruding.

This exhaust chip exhausts the inside of the discharge space through a small-diameter exhaust pipe protruding from the outer surface of the discharge space of the bulb.
This is a trace after chipping, in which a discharge medium such as a rare gas is introduced, and after the introduction, the root of the exhaust pipe is heated and burned by a burner flame or the like, and at the same time, the opening is fused and sealed.

In a metal halide lamp having a discharge space having a small volume of, for example, 0.4 to 2.3 cc, the exhaust chip becomes thicker than the wall of the discharge space. Easy to receive.

For this reason, when the height and the like of the exhaust chip are relatively large with respect to the discharge space portion, a large thermal shock is applied, the pressure resistance of the exhaust chip is reduced, and cracks are easily generated.

Therefore, in the conventional metal halide lamp, the height of the exhaust tip is made as low as possible to maintain the coldest part temperature of the lamp and to improve the lamp characteristics.

[0008]

However, in such a conventional metal halide lamp, the thickness of the exhaust chip is merely reduced by merely reducing the height of the exhaust chip. Under lighting conditions under a high load (for example, a tube wall load of 40 W / cm ² or more) with enhanced characteristics of a light source, high brightness, and high efficiency, the withstand pressure of the exhaust chip cannot withstand the internal pressure of the lighting, and damage such as cracks may occur. It was found that reliability deteriorated.

Accordingly, the present invention has been made in view of such circumstances, and an object of the present invention is to provide a highly reliable high-pressure discharge lamp and a lamp apparatus capable of withstanding high-load lighting conditions without lowering lamp efficiency. , A lighting device, a lighting device, and a liquid crystal projector.

[0010]

According to the first aspect of the present invention,
A pair of electrodes arranged opposite to each other to generate a discharge; a discharge space part having a built-in pair of electrodes and having an inner volume of 0.4 to 2.3 cc; and both ends of the discharge space part are hermetically sealed.
A tube wall load integrally forming a sealing portion for hermetically sealing one end of each electrode shaft of the pair of electrodes is 40 W /
an airtight container having a size of not less than ² cm2; a discharge medium sealed in the discharge space; and a height projecting from the outer surface of the discharge space being 2 to 3 due to chipping of a root portion of an exhaust pipe for exhausting the discharge space. And a 6 mm exhaust tip.

According to the present invention, the height of the exhaust chip is set to 2 to 6 mm in a small metal halide lamp having an inner volume of the discharge space of 0.4 to 2.3 cc.
Even when this lamp was lit at a high tube wall load of 40 W / cm ² or more, the lamp efficiency was hardly reduced, and no damage such as cracks occurred in the airtight container.

That is, according to the present invention, it is possible to improve the reliability of sufficiently withstanding high-load lighting without substantially lowering the lamp efficiency.

According to a second aspect of the present invention, the diameter of the exhaust tip is 2
４4 mm.

According to the present invention, since the diameter of the exhaust chip according to the first aspect of the present invention is set to 2 to 4 mm, the reliability that can sufficiently withstand high-load lighting is improved without substantially lowering the lamp efficiency. Can be done.

According to a third aspect of the present invention, the hermetic container is made of quartz glass, and the sealing portion crushes both ends of the hermetic container and is connected to one end of each electrode and each outer lead wire. It is characterized by burying a body foil.

According to this invention, since the invention of claim 1 or 2 is provided, the same operation and effect as those of the invention can be obtained.

The invention according to claim 4 is characterized in that the pair of electrodes are an anode and a cathode.

According to the present invention, even when the invention of any one of claims 1 to 3 is applied to a high-pressure discharge lamp of DC lighting having an anode and a cathode, the invention of any of claims 1 to 3 is applied. The same operation and effect as described above can be obtained.

The invention according to claim 5 is characterized in that the discharge medium is a metal halide.

According to the present invention, even when the invention of any one of claims 1 to 4 is applied to a metal halide lamp whose discharge medium is a metal halide, the invention is similar to any of the inventions of claims 1 to 4 The effect of the invention can be obtained.

According to a sixth aspect of the present invention, the conductive foil is a molybdenum foil.

According to the present invention, since any one of the first to fifth aspects of the present invention is provided, the same operation and effect as those of the present invention can be obtained.

According to a seventh aspect of the present invention, there is provided a high-pressure discharge lamp according to any one of the first to sixth aspects, wherein the lamp is housed with its lamp axis coinciding with the optical axis and emitted from the lamp. And a reflector that reflects light and projects the light through the front opening.

According to an eighth aspect of the present invention, there is provided a high-pressure discharge lamp according to any one of the first to sixth aspects, and a lighting circuit for supplying a lamp power to a pair of electrodes of the high-pressure discharge lamp to stably light the lamp. It is characterized by having.

According to a ninth aspect of the present invention, there is provided a lighting device according to the eighth aspect, and a device main body for housing the lighting device.

According to a tenth aspect of the present invention, there is provided a lighting device according to the eighth aspect, a liquid crystal display panel driven by a liquid crystal driving device, and controlling light from a high pressure discharge lamp of the lighting device to a screen through the liquid crystal display panel. An optical system for projecting light; a housing that houses a lighting device, a liquid crystal driving device, a liquid crystal display panel, and an optical system, and that has an opening formed to project light transmitted through the liquid crystal display panel onto a screen. It is characterized by having.

The lamp device according to claim 7, the lighting device according to claim 8, the lighting device according to claim 9, and the lighting device according to claim 9.
Since the liquid crystal projector described in Item 0 includes the high-pressure discharge lamp according to any one of Claims 1 to 6,
The same operational effects as those of the present invention can be obtained.

[0028]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. 1 to 6, the same or corresponding parts are denoted by the same reference numerals.

FIG. 1 is a front view showing a main part of a metal halide lamp according to a first embodiment of the present invention in a longitudinal section.
In this figure, a short-arc, small-sized metal halide lamp 1 for direct current lighting has a hollow elliptical spherical discharge space portion of a bulb 2 which is turned on at a tube wall load of 40 W / cm ² or more, which is an airtight container made of, for example, quartz glass. 2a and a pair of sealing portions 2b, 2c formed by hermetically pinching both ends in the major diameter direction in the diametric direction in an integrated manner.

The discharge space 2a has an inner volume of 0.4 to
2.3 cc, and a pair of left and right anodes 3a and cathodes 3b in the figure is provided inside thereof at a predetermined distance between the electrodes (for example, 1 to 3).
5mm) is placed facing each other. Discharge space 2
In a, an appropriate amount of mercury (Hg), a rare gas such as argon (Ar), and an appropriate amount of a metal halide such as dysprosium bromide or cesium iodide are sealed.

The anode 3a and the cathode 3b are connected to the outer ends of the electrode shafts 3c, 3d by a pair of sealing portions 2b,
The pair of molybdenum foils 4a and 4b, which are conductor foils hermetically buried in 2c, are fixed to inner ends of the foils by welding or the like.

The outer ends of the molybdenum foils 4a, 4b are electrically connected to a pair of outer lead wires 5a, 5b, respectively. A base 6 is closely fitted around the outer periphery of one sealing portion 2b, and is fixed with a ceramic adhesive. The conductive screw rod 6a of the base 6 and the other outer lead wire 5
A predetermined lamp voltage is applied to b between the anode 3a and the cathode 3b via a pair of lead wires 7,7.

An exhaust chip 8 protrudes from the outer surface of the discharge space 2a. The exhaust chip 8 exhausts the inside of the discharge space 2a through a small-diameter exhaust pipe (not shown) protruding from the outer surface of the discharge space 2a, and further discharges a discharge medium such as a metal halide through the exhaust pipe. Discharge space 2
After being introduced into a, the root portion of the exhaust pipe is heated by a burner flame or the like to be melted, and at the same time, is a mark formed after chipping for welding and sealing the opening end.

FIG. 2 shows a metal halide lamp 1 constructed as described above, wherein the height h of the exhaust chip 8 is 1.5 mm,
The relative relationship between the height h (mm) of the exhaust chip 8 and the hydrostatic pressure of the chip (atm) when the prototype is manufactured according to the following specifications while changing to 0 mm, 6.0 mm, and 10 mm, respectively. Note that FIG.
In the figure, diamonds indicate the characteristics of the present embodiment, and triangles indicate the characteristics of the conventional example.

[0035]

[Outside 1]

From FIG. 2, it has been found that as the height h of the exhaust chip 8 increases, the chip breakdown voltage gradually increases.

FIG. 3 shows a metal halide lamp 1 having the above specifications.
Shows the relative relationship between the height h (mm) of the exhaust chip 8 and the lamp efficiency. From FIG. 3, it was found that the lamp efficiency (lm / W) gradually decreased as the height of the exhaust chip 8 increased. In FIG. 3, rhombic marks indicate the characteristics of the present embodiment, and triangle marks indicate the characteristics of the conventional example.

Therefore, in consideration of FIGS. 2 and 3, by setting the height of the exhaust chip 8 to 2 to 6 mm, it is possible to improve the chip breakdown voltage without greatly lowering the lamp efficiency. found. That is, according to the present embodiment, since the height of the exhaust chip 8 is set to 2 to 6 mm, the chip withstand voltage can be improved without greatly lowering the lamp efficiency, and 40 W / cm ^2.
It is possible to obtain reliability enough to withstand the lighting conditions of the above high tube wall load.

FIG. 4 shows a configuration of an example of a lamp device 11 and a lighting device 12 thereof according to a second embodiment of the present invention. The lamp device 11 is a metal halide lamp 1
Is housed in a bowl-shaped reflector 13 which is a reflector, and is mounted concentrically on the inner bottom portion having a reduced diameter.

The reflector 13 is formed in a bowl shape from glass or metal, and has a reflection surface 14 made of a vapor-deposited film of TiO ₂ -SiO ₂ having excellent reflection characteristics formed on the inner surface of the rotary curved surface having the focal position F. ing. The reflector 13 has a front projection opening having an opening diameter of, for example, 90 to 130 mm.
The supporting cylindrical portion 15 is formed on the outer bottom of the bowl so as to protrude concentrically outward. The base 6 of the lamp 1 is fixed in the support tube 15 with an adhesive 16 such as insulating cement. Thereby, the lamp 1 is attached to the reflector 13 such that the lamp axis Oa-Ob substantially coincides with the central axis of the reflector 13, that is, the optical axis Oc-Od.

The lamp 1 is arranged such that an intermediate point between the anode 3a and the cathode 3b substantially coincides with the focal position F of the reflector 13. An introduction hole 17 is formed in the reflector 13. One lead wire 7 of the lamp 1 penetrates through the introduction hole 17 and is guided to the rear side. The leading end of the lead wire 7 is connected to one end of a lighting circuit 18, and the other end of the lighting circuit 18 is electrically connected to another conductive wire 7 and a conductive screw rod 6 a of the base 6 via a connector (not shown). The required power is supplied from the lighting circuit 18 to the anode 3a and the cathode 3b via the pair of lead wires 7, 7, the outer leads 5a, 5b, and the molybdenum foils 4a, 4b.
Is supplied stably and lights up. Thus, the lighting device 12 is configured. In addition, the lighting device 12 and a fixture body (not shown) that accommodates the lighting device 12 can be configured as a lighting fixture.

Accordingly, the lamp device 11, the lighting device 12, and the lighting device use the metal halide lamp 1 as a light source, which can improve both the lamp efficiency and the pressure resistance of the exhaust chip 8, so that these devices 11 , 12 can also improve the reliability.

FIG. 5 shows an example of the configuration of a projector 21 according to a third embodiment of the present invention. The projector 21 includes the above-described metal halide lamp 1 and a pair of anodes 3a and cathodes 3b of the lamp 1. A lighting device 12 for supplying a predetermined electric power through the lead wires 7 and 7 to stably light the lamp, and an optical system 23 for projecting light from the metal halide lamp 1 and its reflector 13 onto a screen 22.
And these lamp 1, reflector 13, lighting circuit 18,
And a housing 24 that houses the optical system 23. Case 24
Has an opening 24a for projecting light from the optical system 23 to the screen 22.

The optical system 23 includes a condenser lens 25 for condensing light from the lamp 1 and the reflector 13, a first plane mirror 26, a Fresnel lens 27, and a second plane mirror 28.
The light from the lamp 1 and the reflector 13 is controlled so that the light is projected onto the screen 22 from the opening 24 a of the housing 24.

FIG. 6 shows an example of a liquid crystal projector 31 according to a fourth embodiment of the present invention. For example, a liquid crystal display panel 32 of a color or the like and a light projecting lens 3 are arranged in front of the light projecting portion of the reflector 13 of the lamp device 11 shown in FIG.
3 for projecting a shadow image displayed on the liquid crystal display panel 32 onto a screen 34. The lamp device 11 including the lighting device 12, the liquid crystal display panel 32, and the liquid crystal driving device 35 for driving the liquid crystal display panel 32 are housed in a housing 36.

Therefore, the liquid crystal projector 31
Since the metal halide lamp 1 includes the metal halide lamp 1 as well, it is possible to obtain a reliability that can withstand high-load lighting without greatly lowering the lamp efficiency, similarly to the lamp 1.

[0047]

As described above, according to the first aspect of the present invention, in a small metal halide lamp having an inner volume of a discharge space of 0.4 to 2.3 cc, the height of an exhaust chip is set to 2 to 6 mm. This lamp was set to 40 W / cm ²
Even when the lamp was turned on with the above-mentioned high tube wall load, the lamp efficiency was hardly reduced, and no damage such as cracks occurred in the airtight container.

That is, according to the present invention, it is possible to improve the reliability of sufficiently enduring high-load lighting without substantially lowering the lamp efficiency.

According to the second aspect of the present invention, since the diameter of the exhaust chip according to the first aspect of the present invention is set to 2 to 4 mm, the reliability that can sufficiently withstand high-load lighting without substantially lowering the lamp efficiency. Performance can be improved.

According to the invention of claim 3, since the invention of claim 1 or 2 is provided, the same operation and effect as those of the invention can be obtained.

According to the fourth aspect of the present invention, even when any one of the first to third aspects of the invention is applied to a high pressure discharge lamp of DC lighting having an anode and a cathode, any of the first to third aspects of the present invention is applicable. The same operation and effect as those of the invention can be obtained.

According to the invention of claim 5, even when the invention of any of claims 1 to 4 is applied to a metal halide lamp whose discharge medium is a metal halide, the invention of any of claims 1 to 4 is applicable. The same operation and effect as the invention can be obtained.

According to the sixth aspect of the present invention, since any one of the first to fifth aspects of the present invention is provided, the same operational effects as those of the present invention can be obtained.

The lamp device according to claim 7, the lighting device according to claim 8, the lighting device according to claim 9, and the liquid crystal projector according to claim 10 each have a high voltage according to any one of claims 1 to 6. With the discharge lamp, the same operation and effects as those described above can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway longitudinal sectional view of a metal halide lamp according to a first embodiment of the present invention.

FIG. 2 is a graph showing the relative relationship between the height of the exhaust chip and the chip breakdown voltage of the metal halide lamp shown in FIG.

FIG. 3 is a graph showing the relative relationship between the height of the exhaust chip and the lamp efficiency of the metal halide lamp shown in FIG.

FIG. 4 is a longitudinal sectional view of an example of a lamp device according to a second embodiment including the metal halide lamp shown in FIG. 1 and a lighting device thereof.

FIG. 5 is a schematic diagram showing an overall configuration of a projector according to a third embodiment including the metal halide lamp shown in FIG.

FIG. 6 is a schematic diagram showing a configuration of a liquid crystal projector according to a fourth embodiment including the lamp device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Short-arc metal halide lamp of direct current lighting type 2 Bulb 2a Hollow elliptical spherical discharge space part 2b, 2c Bulb sealing part 3a Anode 3b Cathode 3c, 3d Electrode shaft 4a, 4b Molybdenum foil 5a, 5b Outer lead wire 6 Base 11 Lamp device 12 Lighting device 13 Reflector 14 Reflecting surface 18 Lighting circuit 21 Projector 22 Screen 23 Optical system 31 Liquid crystal projector 32 Liquid crystal display panel 35 Liquid crystal driving device

Continuing on the front page (72) Inventor Mamoru Furuya 4-3-1 Higashi-Shinagawa, Shinagawa-ku, Tokyo Toshiba Lighting & Technology Corporation (72) Inventor Nansei Murase 4-3-1 Higashi-Shinagawa, Shinagawa-ku, Tokyo Toshiba Lighting & Technology Corporation In company

Claims (10)

[Claims] 1. A pair of electrodes which are arranged opposite to each other to generate a discharge; and a capacity of the pair of electrodes is 0.4 to 2.3.
A discharge space portion of cc and a sealing portion that hermetically seals both ends of the discharge space portion and hermetically seals one end of each electrode shaft of the pair of electrodes are integrally formed. An airtight container having a tube wall load of 40 W / cm ² or more; a discharge medium sealed in the discharge space; and a projection protruding from the outer surface of the discharge space due to chipping at the base of an exhaust pipe for exhausting the discharge space. A discharge tip having a height of 2 to 6 mm. 2. The high-pressure discharge lamp according to claim 1, wherein the diameter of the exhaust chip is 2 to 4 mm. 3. The airtight container is made of quartz glass, and the sealing portion crushes both ends of the airtight container and embeds a conductive foil connected to one end of each electrode and each outer lead wire. The high-pressure discharge lamp according to claim 1 or 2, wherein 4. The high-pressure discharge lamp according to claim 1, wherein the pair of electrodes are an anode and a cathode. 5. The high-pressure discharge lamp according to claim 1, wherein the discharge medium is a metal halide. 6. The high-pressure discharge lamp according to claim 1, wherein the conductor foil is a molybdenum foil. 7. A high-pressure discharge lamp according to claim 1, wherein the lamp is housed and supported with its lamp axis coinciding with the optical axis, and the light radiated from the lamp is received. A reflector that reflects and projects light from a front opening. 8. A high-pressure discharge lamp according to any one of claims 1 to 6, and a lighting circuit for supplying electric power to a pair of electrodes of the high-pressure discharge lamp and stably lighting the same. Lighting device. 9. A lighting device comprising: the lighting device according to claim 8; and a fixture main body that houses the lighting device. 10. A lighting device according to claim 8, a liquid crystal display panel driven by a liquid crystal driving device, and an optical system for controlling light from a high-pressure discharge lamp of the lighting device to project light onto a screen through the liquid crystal display panel. And; containing a lighting device, a liquid crystal driving device, a liquid crystal display panel, and an optical system,
A housing having an opening for projecting light transmitted through the liquid crystal display panel onto the screen.