JP2001332213A - High-pressure mercury lamp, illuminating optical equipment using the mercury lamp, and image display apparatus using the optical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an electrode containing very few impurities and tungsten as a major component from breakage during the manufacturing process or during lighting. SOLUTION: This lamp is equipped with a luminescent portion 2, having electrodes 4 therein and sealing mercury, an inert gas and a halogen gas, and a luminescent bulb 1 having sealing portions 3 at the both ends of this luminescent portion 2, and polar axial portions 7 of the electrodes 4 are surrounded with reinforced members 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure mercury lamp used for general lighting and optical equipment, an illumination optical device using the high-pressure mercury lamp, and an image display device using the illumination optical device. .

[0002]

2. Description of the Related Art Conventionally, in an illumination optical device used for an image display device such as a liquid crystal projector, a light source and a concave reflecting mirror are usually integrated. As the light source, a short arc ultra-high pressure mercury lamp, which is close to a point light source in terms of efficiency, high brightness, good balance of red, blue, and green in emitted light, and long life, is often used. Used.

[0003] Such an ultra-high pressure mercury lamp includes an arc tube having a light emitting portion and sealing portions provided at both ends of the light emitting portion. In the light emitting portion, an electrode having an electrode shaft portion to which a coil is attached at a tip portion, and an electrode mainly containing tungsten is provided. In addition, a small amount of halogen gas is sealed in the light emitting portion in addition to mercury as a light emitting metal and an inert gas as a starting gas.

[0004] As described above, in the ultrahigh-pressure mercury lamp, generally, the life is extended by enclosing a halogen gas and using a halogen cycle. However, impurities (potassium, sodium, lithium, etc.)
If present, the halogen cycle is inhibited,
Life will be shortened. Therefore, impurities other than tungsten in the electrode as well as in the discharge space of the light emitting section are removed as much as possible.

[0005]

However, in such a conventional ultra-high pressure mercury lamp, the use of an electrode having a very small amount of impurities results in the production process, specifically, the formation of the sealing portion of the arc tube. The electrode is heated at a high temperature and easily recrystallized, which causes a problem that the mechanical strength of the electrode is remarkably reduced, cracks are generated in the electrode shaft, and in some cases, the electrode shaft is broken. there were.

Also, an electrode having a crack in the electrode shaft portion is broken by the influence of heat during lighting.

The present invention has been made to solve such a problem. In particular, in the case where an electrode containing extremely few impurities and containing tungsten as a main component is used, the electrode may be used during the manufacturing process or during lighting. It is an object of the present invention to provide a highly reliable high-pressure mercury lamp capable of preventing breakage inside, an illumination optical device using the high-pressure mercury lamp, and an image display device using the illumination optical device.

[0008]

According to a first aspect of the present invention, there is provided a high-pressure mercury lamp having electrodes therein.
A light-emitting tube having a light-emitting portion in which mercury, an inert gas, and a halogen gas are sealed, and sealing portions provided at both ends of the light-emitting portion; an electrode shaft portion of the electrode is surrounded by a reinforcing member; It has a configuration that

In a high-pressure mercury lamp according to a second aspect of the present invention, the component of the electrode shaft portion is mainly composed of tungsten,
The total content of subcomponents including potassium, iron, aluminum, calcium, chromium, molybdenum, nickel, and silicon is 40 ppm or less, and the content of potassium is 1
It has a configuration in which the content of iron is 0 ppm or less and the content of iron is 15 ppm or less.

The high-pressure mercury lamp according to claim 3 of the present invention has a configuration in which the reinforcing member has a pipe shape or a coil shape.

Further, in the high-pressure mercury lamp according to claim 4 of the present invention, the reinforcing member has a configuration in which molybdenum, tungsten, rhenium or iridium is a main component.

In the high-pressure mercury lamp according to a fifth aspect of the present invention, when the outer diameter of the electrode shaft is R (mm) and the thickness of the pipe-shaped reinforcing member is r ₁ (mm), 1 / mm. 30R
It has a configuration that satisfies the relational expression of ≦ r ₁ ≦ １ ／ R.

In the high-pressure mercury lamp according to claim 6 of the present invention, when the outer diameter of the electrode shaft is R (mm) and the wire diameter of the coil-shaped reinforcing member is r ₂ (mm), 1 / 10R
≦ r ₂ ≦ 3 / 4R.

According to these configurations, even if the mechanical strength of the electrode is reduced, the reduction in the mechanical strength of the electrode can be compensated for by the reinforcing member. Can be prevented from being broken.

Further, in the high-pressure mercury lamp of the present invention, the component of the electrode shaft portion is mainly composed of tungsten, and potassium, iron,
The total content of sub-components including aluminum, calcium, chromium, molybdenum, nickel and silicon is 40 pp
The effect can be particularly exerted when an electrode having a content of potassium of 10 ppm or less and an iron content of 15 ppm or less is used.

The "main component" is defined as having a content of 99.9% or more and 100% or less (the same applies hereinafter).

According to a seventh aspect of the present invention, there is provided an illumination optical device, comprising: a high-pressure mercury lamp according to any one of the first to sixth aspects; and a reflecting mirror having a parabolic or elliptical reflecting surface. Are integrated.

Thus, a highly reliable illumination optical device can be obtained while maintaining high lamp efficiency, high color rendering, and long life.

The illumination optical device according to the present invention may further comprise a light source unit, a light condensing unit for condensing light emitted from the light source unit, and a light condensing unit for condensing the light condensed from the light collecting unit. A projection lens system for projecting and a screen on which light projected from the projection lens system is projected, and the illumination optical device according to claim 7 is used for the light source unit.

As a result, it is possible to obtain a highly reliable image display device while maintaining high lamp efficiency, high color rendering, and long life.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An ultra-high pressure mercury lamp with a lamp power of 150 W according to a first embodiment of the present invention, an illumination optical device using the ultra-high pressure mercury lamp, and an image display device using the illumination optical device Will be described with reference to the drawings.

As shown in FIG. 1, the ultra-high pressure mercury lamp is
An arc tube 1 made of quartz glass is provided. The arc tube 1 has a substantially spheroidal shape, a maximum inner diameter of 5.3 mm at the center, an inner volume of 0.10 mm ³ , and a wall thickness of 2.6 m.
The light-emitting unit 2 includes a light-emitting unit 2 and a sealing unit 3 provided at both ends of the light-emitting unit 2.

Electrodes 4 are provided at both ends in the light emitting section 2. The distance between the electrodes 4 is 1.2 mm. Further, in the light emitting section 2, one mercury as a light emitting metal is contained.
7.5 mg (about 0.175 mg / mm ³ , mercury vapor pressure during stable lighting: 17.5 MPa), 1.2 × 10 ⁻⁴ μmol / mm ³ of bromine as a halogen gas, and argon gas as a starting gas. Each of 20 kPa is sealed.

The electrode 4 is connected to external lead wires 6a and 6b via a metal foil conductor 5 such as molybdenum sealed in the sealing portion 3. This electrode 4 has an outer diameter of 0.4 m.
m, an electrode shaft 7 having a length of 9.0 mm, and the electrode shaft 7
Consisting of a wire diameter of 0.20 mm attached to the tip of
It has a densely wound coil portion 8 (the first layer has 14 turns, the second layer has 7 turns).

The components of the electrode shaft portion 7 and the coil portion 8 are mainly composed of tungsten, and contain impurities, that is, potassium, iron, aluminum, calcium, chromium, molybdenum, nickel, and silicon as subcomponents. . The total content of these subcomponents is 40 ppm or less, for example, 8 ppm, and among them, the content of potassium is 10 ppm.
pm or less, for example, 3 ppm, and the iron content is 15 ppm or less, for example, 2 ppm.

The electrode shaft 7 has the same components as those of the electrode shaft 7 and the coil 8 except for the tip where the coil 8 is provided, and has an outer diameter of 0.52 mm, an inner diameter of 0.42 mm,
A pipe-shaped reinforcing member 9 having a length of 4.0 mm is surrounded. The electrode shaft 7 and the reinforcing member 9 are fixed by, for example, resistance welding or the like.

Next, in the illumination optical device, as shown in FIG. 2, such an ultra-high pressure mercury lamp is provided inside the reflector 10, and the lamp axis of the ultra-high pressure mercury lamp coincides with the optical axis of the reflector 10. As shown in FIG.

In FIG. 2, the optical axis of the reflecting mirror 10 is represented by a symbol X.
Indicated by

One external lead (not shown) of the ultra-high pressure mercury lamp is connected to a base 11 provided at the end of the ultra-high pressure mercury lamp, and the other external lead 6b is similarly connected to a power supply line 12. Have been. The end of the power supply line 12 opposite to the external lead wire 6b penetrates the reflecting mirror 10 and is led out on the opposite side to the reflecting surface 10a of the reflecting mirror 10 described later.

The reflecting mirror 10 is made of ceramic and has a funnel shape, and has a concave reflecting surface 10a made of a deposited film of titanium oxide and silicon oxide on its inner surface. The front projection part of the reflecting mirror 10, that is, the opening part 10b has a diameter of about 65 mm. The reflecting mirror 10 has a supporting cylinder 10c on the opposite side to the opening 10b.
have. A base 11 is fixed to the support cylinder portion 10c with insulating cement 13.

Further, as shown in FIG. 3, an image display device using such an illumination optical device was constructed.

This image display device includes a light source unit 14 having an illumination optical device, a light collecting unit 15 for collecting light emitted from the light source unit 14, and a screen 16 for collecting the collected light.
And a projection lens system 17 for projecting the light to the projector.

Next, the operational effects of the ultra-high pressure mercury lamp, the illumination optical device, and the image display device according to the first embodiment of the present invention were examined.

[0034] First, ultra-high pressure mercury lamp electrode shaft 7 as described above using an electrode 4 which is surrounded by a pipe-shaped reinforcing member 9 (hereinafter, book invention product A ₁₎ during the manufacturing process of the (sealing The breaking rate of the electrode 4 (at the time of forming the portion 3) or during lighting was examined.

For comparison, the same configuration as that of the ultrahigh-pressure mercury lamp with a lamp power of 150 W according to the first embodiment of the present invention is adopted except that the electrode shaft 7 is not surrounded by the reinforcing member 9. have been and ultra-high pressure mercury lamp of the lamp power 150 W (hereinafter, referred to as Comparative product a ₁₎ for were also examined breakage of the electrode 4 in the same conditions as the present invention product a _1.

Incidentally, 200 pieces of the product A _{1 of} the present invention and 200 pieces of the comparative product A ₁ were produced.

[0037] Consequently, the present invention product A _1, electrode 4 in that of the total number were not those breakage and during the lighting time of manufacture process. In other words, breakage rate of the inventive product A ₁ in the electrode 4 was 0%. On the other hand, in the comparative product A _1, 200 present in eighteen electrodes 4 of those were broken or lit during the manufacturing process. In other words, breakage rate of Comparative Product A ₁ in the electrode 4 was 9%.

Next, an image display apparatus according to a first embodiment of the present invention (hereinafter, referred to as the present invention product A ₂₎ in the illumination optical apparatus, an AC power supply between the mouthpiece 11 and the power supply line 12 ( (Not shown), the ultra-high pressure mercury lamp is turned on at a lamp voltage of about 68 V, a lamp current of about 2.2 A, and a lamp power of 150 W, and the lamp efficiency (lm / W) and the reflector 10
The color temperature (K) of the radiated light and the temporal change of the screen illuminance maintenance ratio were examined.

Further, for comparison, has an image display device the same configuration as the first embodiment of the present invention except for using the same ultra-high pressure Mercury lamp and the Comparative Product A ₁ With respect to the image display device (hereinafter, comparative product A ₂ ), the lamp efficiency, the color temperature of the light emitted from the reflecting mirror 10, and the change over time in the screen illuminance maintenance ratio were examined under the same conditions as those of the inventive product A ₂ .

[0040] Note that the temporal change of screen illuminance maintenance factor of the present invention product A ₂ and Comparative Product A ₂ are respectively shown in FIG. However, shown in FIG. 4, the symbol i is the present invention product A _2, symbol B is a comparative product A ₂ respectively.

[0041] As a result, none of the present invention product A ₂ and Comparative Product A _2, lamp efficiency is 65lm / W, also color temperature of the emitted light from the reflecting mirror 10 was about 7000K.
Further, as apparent from FIG. 4, is almost the same even none of the present invention product A ₂ and Comparative Product A ₂ for aging of the screen illuminance maintenance factor, for example, 3000 hours of light after the lapse of the screen illuminance maintenance factor Both were about 85%.

As described above, according to the configuration of the ultrahigh-pressure mercury lamp according to the first embodiment of the present invention, the mechanical strength of the electrode 4 is maintained while maintaining high lamp efficiency, high color rendering, and long life. Even if the value decreases, the electrode 4 can be prevented from being broken during the manufacturing process or during lighting, and high reliability can be obtained.

When the outer diameter of the electrode shaft 7 is R (mm) and the thickness of the pipe-shaped reinforcing member 9 is r ₁ (mm),
It is preferable to satisfy the relational expression of 1 / 30R ≦ r ₁ ≦ 1 / 2R. The reason is as follows.

In the ultra-high pressure mercury lamp with a lamp power of 150 W according to the first embodiment of the present invention, the outer diameter R of the electrode shaft 7 of the electrode 4 is set to, for example, 0.4 mm, and the pipe-shaped reinforcing member 9 is formed. The presence or absence of breakage of the electrode 4 (electrode shaft portion 7) when the wall thickness r ₁ (mm) is variously changed, and the arc tube 1
Each was examined for the occurrence of cracks, and the results shown in Table 1 were obtained.

In Table 1, the mark “○” is good,
The “x” mark indicates that each is defective.

[0046]

[Table 1]

As is clear from Table 1, when the outer diameter of the electrode shaft 7 is 0.4 mm, the thickness r ₁ of the reinforcing member 9 is set.
It was found that when the thickness was 0.013 mm or more, the electrode 4 did not break. On the other hand, the thickness r ₁ of the reinforcing member 9 is 0.013.
If the thickness is less than 1 mm, for example, 0.01 mm, the electrode 4 breaks.
This is considered to be because the thickness r ₁ of the reinforcing member 9 is too thin. The thickness r ₁ of the reinforcing member 9 is 0.2 mm.
It was found that cracks occurred in the arc tube 1 at, for example, 0.205 mm. This is the reinforcement member 9
Is considered to be because the thickness r ₁ of the light emitting tube was too thick, and the strength of the arc tube 1 was reduced.

Therefore, when the thickness r ₁ (mm) of the pipe-shaped reinforcing member 9 satisfies the above relational expression of 1 / 30R ≦ r ₁ ≦ 1 / 2R, the reinforcing member 9 prevents the electrode 4 from being broken. In addition, it is possible to sufficiently fulfill the function of reducing the strength of the arc tube 1 and to prevent the arc tube 1 from cracking.

Further, according to the configuration of the illumination optical apparatus according to the first embodiment of the present invention, high reliability can be obtained while maintaining high lamp efficiency, high color rendering, and long life.

Further, according to the configuration of the image display device according to the first embodiment of the present invention, high reliability can be obtained while maintaining high lamp efficiency, high color rendering, and long life.

Next, an ultra-high pressure mercury lamp with a lamp power of 150 W, an illumination optical device using the ultra high pressure mercury lamp, and an image display device using the illumination optical device according to a second embodiment of the present invention will be described. explain.

As shown in FIG. 5, the ultra-high pressure mercury lamp with a lamp power of 150 W is provided on the electrode shaft portion 7 except for the tip portion where the coil portion 8 is provided, instead of the pipe-shaped reinforcing member 9. A lamp according to a first embodiment of the present invention except that a single-layer tightly wound coil-shaped reinforcing member 18 mainly composed of tungsten having a wire diameter of 0.01 mm and a length of 4.0 mm is surrounded. It has the same configuration as an ultra-high pressure mercury lamp with a power of 150 W.

The electrode shaft 7 and the reinforcing member 18 are fixed by, for example, resistance welding.

The illumination optical device (not shown) uses the first embodiment of the present invention as shown in FIG. 2 except that an ultra-high pressure mercury lamp with a lamp power of 150 W according to the second embodiment of the present invention is used. It has the same configuration as the illumination optical device according to the embodiment.

An image display device (not shown) has a first embodiment of the present invention as shown in FIG. 3 except that an illumination optical device according to a second embodiment of the present invention is used. It has the same configuration as the image display device which is an embodiment.

Next, the operational effects of the ultra-high pressure mercury lamp, the illumination optical device, and the image display device according to the second embodiment of the present invention were examined.

First, during the manufacturing process (sealing) of an ultra-high pressure mercury lamp (hereinafter referred to as the product B _{1 of} the present invention) using the electrode 4 in which the electrode shaft portion 7 is surrounded by the coil-shaped reinforcing member 18 as described above. The electrode 4 (at the time of forming the part 3) or the lighted electrode 4 (electrode shaft part 7)
Was examined for the breakage rate.

[0058] Incidentally, the present invention product B ₁ produced 200 present.

[0059] Consequently, the present invention product B _1, electrode 4 in that of the total number were not those breakage and during the lighting time of manufacture process. In other words, breakage rate of the present invention product B ₁ at electrode 4 is was 0%.

Next, an image display apparatus according to a second embodiment of the present invention (hereinafter, referred to as the present invention product B ₂₎ in the illumination optical apparatus, connecting the AC power source between the cap and the power supply line And a lamp voltage of about 68 V and a lamp current of about 2.2
A, an ultra-high pressure mercury lamp was turned on at a lamp power of 150 W, and the lamp efficiency (lm / W), the color temperature of emitted light from a reflecting mirror (K), and the change over time in the screen illuminance maintenance ratio were examined.

[0061] For comparison, it has an image display device the same configuration as the first embodiment of the present invention except for using the same ultra-high pressure mercury lamp and the Comparative Product A ₁ With respect to the image display device (hereinafter, comparative product B ₂ ), the lamp efficiency, the color temperature of light emitted from the reflecting mirror, and the change over time in the screen illuminance maintenance ratio were examined under the same conditions as those of the inventive product B ₂ .

[0062] Note that the temporal change of screen illuminance maintenance factor of the present invention product B ₂ and Comparative Product B ₂ are respectively shown in FIG. However, shown in FIG. 6, the symbol c is the present invention product B _2, the symbol D is a comparative product B _2, respectively.

As a result, the product B of the present invention_TwoAnd comparative product B_Twoof
In each case, the lamp efficiency is 65 lm / W and the reflection is
The color temperature of the light emitted from the mirror was about 7000K. Ma
In addition, as is clear from FIG.
The product of the present invention B with time change _TwoAnd comparative product B_TwoNozomi
They are almost the same, for example, after 3000 hours of lighting.
Were about 86% in both cases.

According to the configuration of the extra-high pressure mercury lamp according to the second embodiment of the present invention as described above, the first
As in the case of the ultrahigh-pressure mercury lamp 1 according to the embodiment, while maintaining high lamp efficiency, high color rendering, and long life, even if the mechanical strength of the electrode 4 is reduced, the electrode 4 may be turned on or off during the manufacturing process. Breakage inside can be prevented, and high reliability can be obtained.

When the outer diameter of the electrode shaft 7 is R (mm) and the wire diameter of the coil-shaped reinforcing member 18 is r ₂ (mm), a relational expression of 1 / 10R ≦ r ₂ ≦ 3 / 4R It is preferable to satisfy the following. The reason is as follows.

In the ultra-high pressure mercury lamp with a lamp power of 150 W according to the second embodiment of the present invention, the outer diameter R of the electrode shaft 7 of the electrode 4 is set to, for example, 0.4 mm, and the coil-shaped reinforcing member 18 is formed. When the thickness of the electrode 4 (electrode shaft portion 7) was changed and the occurrence of cracks in the arc tube 1 was examined when the thickness r ₂ (mm) was variously changed, the results were as shown in Table 2. was gotten.

The thickness r ₂ (mm) of the reinforcing member 18 was variously changed by changing the wire diameter of the coil-shaped reinforcing member 18.

In Table 2, the mark “○” is good,
The “x” mark indicates that each is defective.

[0069]

[Table 2]

As is clear from Table 2, when the outer diameter of the electrode shaft 7 is 0.4 mm, the thickness r
₂ it was found that the breakage of the electrode 4 does not occur in the above 0.04 mm. On the other hand, the thickness r ₂ of the reinforcing member 18 is 0.04
The electrode 4 was broken when the thickness was less than 0.03 mm, for example, 0.03 mm.
This is considered to be because the thickness r ₂ reinforcing member 18 is too thin. The thickness r ₂ of the reinforcing member 18 is 0.3
It was found that cracks occurred in the arc tube 1 when the diameter exceeded 0.3 mm, for example, 0.35 mm. This wall thickness r ₁ is too thick reinforcing member 18, the intensity of the light emission tube 1 is considered to be due to decreased.

Therefore, when the thickness r ₂ (mm) of the coil-shaped reinforcing member 18 satisfies the relational expression of 1 / 10R ≦ r ₁ ≦ 3 / 4R, the reinforcing member 18 prevents the electrode 4 from being broken. In addition, it is possible to sufficiently fulfill the function of reducing the strength of the arc tube 1 and to prevent the arc tube 1 from cracking.

Further, according to the configuration of the illumination optical device according to the second embodiment of the present invention, like the illumination optical device according to the first embodiment of the present invention, high lamp efficiency and high color rendering properties are obtained. And high reliability can be obtained while maintaining a long life.

Further, according to the configuration of the image display device according to the second embodiment of the present invention, as with the image display device according to the first embodiment of the present invention, high lamp efficiency,
High reliability can be obtained while maintaining high color rendering properties and long life.

Next, an ultra-high pressure mercury lamp with a lamp power of 150 W, an illumination optical device using the ultra high pressure mercury lamp, and an image display device using the illumination optical device according to the third embodiment of the present invention will be described. explain.

As shown in FIG. 7, the ultra-high pressure mercury lamp with a lamp power of 150 W has the same configuration as the ultra-high pressure mercury lamp with a lamp power of 150 W according to the second embodiment of the present invention except that the electrode structure is different. have.

The electrode 19 has a maximum outer diameter of 1.2 mm at the distal end of the discharge path, an outer diameter of 0.8 mm at the distal end of the discharge path, and an outer diameter of 0.4 mm of the electrode shaft 20 at the sealing section 3 side. It consists of body electrodes. The distance between the electrodes 19 is 1.2 mm. The end of the electrode 19 on the sealing portion 3 side is connected to an external lead wire (not shown) via a metal foil conductor 5 such as molybdenum sealed in the sealing portion 3.

The electrode 19 has tungsten as a main component and potassium as an impurity, that is, an auxiliary component.
Iron, aluminum, calcium, chromium, molybdenum,
Contains nickel and silicon. The total content of these subcomponents is 40 ppm or less, for example, 7 ppm, and among them, the potassium content is 10 ppm or less, for example, 2 ppm.
ppm, iron content is 15 ppm or less, for example, 2 ppm
It is.

The electrode shaft portion 20 of the electrode 19 is made of the same components as the electrode 19, and has a wire diameter of 0.01 mm and a length of 4.0 mm.
Is surrounded by the coil-shaped reinforcing member 18. The reinforcing member 18 and the electrode shaft portion 20 are fixed by, for example, resistance welding or the like.

The illumination optical device (not shown) uses the first embodiment of the present invention as shown in FIG. 2 except that an ultra-high pressure mercury lamp with a lamp power of 150 W according to the third embodiment of the present invention is used. It has the same configuration as the illumination optical device according to the embodiment.

An image display device (not shown) has a first embodiment of the present invention as shown in FIG. 3 except that an illumination optical device according to the third embodiment of the present invention is used. It has the same configuration as the image display device which is an embodiment.

Next, the operational effects of the ultra-high pressure mercury lamp, the illumination optical device, and the image display device according to the third embodiment of the present invention were examined.

[0082] First, ultra-high pressure mercury lamp electrode shaft portion 20 as described above using an electrode 19 which is surrounded by a coil-like reinforcing member 18 (hereinafter, referred to as present invention products C ₁₎ during the manufacturing process of the (sealing The breaking ratio of the electrode 19 (the electrode shaft portion 20) during the formation of the portion 3) or during lighting was examined.

For comparison, the electrode shaft 20 is reinforced.
The third aspect of the present invention except that it is not surrounded by the member 18
Ultra-high pressure mercury lamp with lamp power of 150 W according to an embodiment
Ultra high voltage with lamp power 150W having the same configuration as the lamp
Mercury lamp (hereinafter, comparative product C) ₁Book)
Invention C₁Check the breakage rate of electrode 19 under the same conditions as
Was.

Incidentally, 200 pieces each of the product C _{1 of} the present invention and the comparative product C ₁ were produced.

[0085] Consequently, the present invention product C _1, electrode 19 in what the total number was not obtained by breaking and during the lighting time of manufacture process. In other words, breakage rate of the inventive product A ₁ in the electrode 19 was 0%. On the other hand, in the comparative product C _1, 200
42 of the electrodes 19 were broken during the manufacturing process or during lighting. In other words, breakage rate of comparative C ₁ at electrode 19 was 21%.

[0086] Next, an image display apparatus according to a second embodiment of the present invention (hereinafter, referred to as the present invention product C ₂₎ the illumination optical apparatus, to connect the AC source between the cap and the power supply line An ultra-high pressure mercury lamp is turned on with a lamp voltage of about 68 V, a lamp current of about 2.2 A, and a lamp power of 150 W, and maintains the lamp efficiency (lm / W), the color temperature of light emitted from the reflector (K), and the screen illuminance. The rate of change over time was examined.

[0087] For comparison, it has an image display device the same configuration as the third embodiment of the present invention except for using the same ultra-high pressure mercury lamp and the comparative products C ₁ With respect to the image display device (hereinafter, comparative product C ₂ ), the lamp efficiency, the color temperature of the light emitted from the reflecting mirror, and the time-dependent changes in the screen illuminance maintenance ratio were examined under the same conditions as the inventive product C ₂ .

[0088] Note that the temporal change of screen illuminance maintenance factor of the present invention product C ₂ and comparative C ₂ are respectively shown in FIG. However, it is shown in FIG. 8, the symbol ho the present invention product C _2, the symbol f is the comparative C _2, respectively.

As a result, the product C of the present invention_TwoAnd comparative product C_Twoof
In each case, the lamp efficiency is 64 lm / W and the reflection is
The color temperature of the light emitted from the mirror was about 6900K. Ma
In addition, as is clear from FIG.
The product of the present invention C _TwoAnd comparative product C_TwoNozomi
They are almost the same, for example, after lighting for 5000 hours.
Was 92%.

According to the configuration of the extra-high pressure mercury lamp according to the third embodiment of the present invention as described above, the first
Similarly to the ultra high pressure mercury lamp according to the embodiment, the electrode 1 is maintained while maintaining high lamp efficiency, high color rendering, and long life.
Even if the mechanical strength of the electrode 9 is reduced, it is possible to prevent the electrode 19 from being broken during the manufacturing process or during lighting, and to obtain high reliability.

Further, according to the configuration of the illumination optical device according to the third embodiment of the present invention, like the illumination optical device according to the first embodiment of the present invention, high lamp efficiency and high color rendering properties are obtained. And high reliability can be obtained while maintaining a long life.

Further, according to the configuration of the image display device according to the third embodiment of the present invention, as with the image display device according to the first embodiment of the present invention, high lamp efficiency,
High reliability can be obtained while maintaining high color rendering properties and long life.

In the first to third embodiments, the reinforcing members 9 and 18 containing tungsten as a main component have been described. However, not only tungsten but also molybdenum, rhenium, or iridium as a main component. Even when a reinforcing member is used, the same effect as described above can be obtained.

In the first to third embodiments, the case where the present invention is applied to an ultra-high pressure mercury lamp with a lamp power of 150 W has been described. Even when applied to a high-pressure mercury lamp having a vapor pressure (during stable lighting) of 10 Pa to 25 MPa, the same effect as described above can be obtained.

Further, the present invention can be applied not only to an ultra-high pressure mercury lamp of AC lighting but also to an ultra-high pressure mercury lamp of DC lighting.

[0096]

As described above, according to the present invention, while maintaining high lamp efficiency, high color rendering, and long life, even if the mechanical strength of the electrode is reduced, the electrode is broken during the manufacturing process or during lighting. Therefore, a highly reliable high-pressure mercury lamp can be provided.

Further, the present invention can provide a highly reliable illumination optical device while maintaining high lamp efficiency, high color rendering, and long life by using the high-pressure mercury lamp of the present invention. It is.

Further, the present invention provides a highly reliable image display device while maintaining high lamp efficiency, high color rendering, and long life by using the illumination optical device of the present invention for a light source section. You can do it.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a high-pressure mercury lamp according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of an illumination optical device using the same high-pressure mercury lamp.

FIG. 3 is a schematic diagram of an image display device also using the illumination optical device.

FIG. 4 is a diagram showing a temporal change of a screen illuminance maintenance ratio of the image display device.

FIG. 5 is an enlarged sectional view of a main part of a high-pressure mercury lamp according to a second embodiment of the present invention.

FIG. 6 is a diagram showing a temporal change of a screen illuminance maintenance ratio of the image display device.

FIG. 7 is an enlarged sectional view of a main part of a high-pressure mercury lamp according to a third embodiment of the present invention.

FIG. 8 is a diagram showing a temporal change of a screen illuminance maintenance ratio of the image display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Arc tube 2 Light emitting part 3 Sealing part 4, 19 electrode 5 Metal foil conductor 6a, 6b External lead wire 7, 20 Electrode shaft part 8 Coil part 9, 18 Reinforcing member 10 Reflecting mirror 10a Reflecting surface 10b Opening 10c Support cylinder Unit 11 Base 12 Power supply line 13 Insulating cement 14 Light source unit 15 Condensing unit 16 Screen 17 Projection lens system

Claims (8)

[Claims] 1. An arc tube having an electrode provided therein and having a light emitting portion in which mercury, an inert gas, and a halogen gas are sealed, and sealing portions provided at both ends of the light emitting portion. A high-pressure mercury lamp, wherein an electrode shaft of the electrode is surrounded by a reinforcing member. 2. The electrode shaft component has a total content of subcomponents containing tungsten as a main component, potassium, iron, aluminum, calcium, chromium, molybdenum, nickel and silicon of 40 ppm or less, and said potassium Is 10 ppm or less, and the iron content is 15 p
2. The high-pressure mercury lamp according to claim 1, wherein the pressure is not more than pm. 3. The high-pressure mercury lamp according to claim 1, wherein the reinforcing member has a pipe shape or a coil shape. 4. The high-pressure mercury lamp according to claim 1, wherein the reinforcing member contains molybdenum, tungsten, rhenium, or iridium as a main component. 5. When the outer diameter of the electrode shaft is R (mm) and the thickness of the pipe-shaped reinforcing member is r ₁ (mm),
_{1 / 30R ≦ r 1 ≦ 1} / 2R becomes a high-pressure mercury lamp according to any one of claims 1 to 4, characterized in that satisfies the relational expression. 6. When the outer diameter of the electrode shaft is R (mm) and the wire diameter of the coil-shaped reinforcing member is r ₂ (mm),
_{1 / 10R ≦ r 2 ≦ 3} / 4R becomes a high-pressure mercury lamp according to any one of claims 1 to 4, characterized in that satisfies the relational expression. 7. An illumination, wherein the high-pressure mercury lamp according to claim 1 is integrated with a reflector having a parabolic or elliptical reflecting surface. Optical device. 8. A light source unit, a condensing unit for condensing light emitted from the light source unit, a projection lens system for projecting the light condensed from the condensing unit, and a projection from the projection lens system. An image display device comprising: a screen on which reflected light is projected; and the illumination optical device according to claim 7 being used as the light source unit.