JP2002289141A - High pressure discharge lamp, its production method and its lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high pressure discharge lamp, its production method and its lighting system to realize longer operation life as well as to improve luminous flux maintenance factor. SOLUTION: A translucent discharge container 1 equipped with a first and a second reduced pressure sealing parts 1b and 1c at both sides, a pair electrode 2 and 2 in which a rear anchor connects with an attached metal foil 3 in the first and the second reduced pressure sealing parts 1b and 1c and is equipped in the translucent discharge container 1 and a discharge medium which includes mercury and noble gas being at least 15 MPa or more in mercury vapor pressure when a light is switched on and halide or halogen being 8 or more in halogen density (g/m<3> ) per unit capacity of the translucent discharge container and which doesn't include alkali metal or alkali metal halide to an influenced extent for emission spectrum in the range from 580 to 780 nm in wave length, are provided in the invention.

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 that generates visible light by ultra-high-pressure mercury vapor discharge, a method of manufacturing the high-pressure discharge lamp, and a lighting device.

[0002]

2. Description of the Related Art In recent years, high-pressure discharge lamps have been employed as light sources in devices for enlarging and projecting images, such as liquid crystal projectors and overhead projectors. In particular, a liquid crystal projector is a device that can project not only a still image but also a moving image. Since various images can be projected by inputting a video signal or an image signal of a personal computer, it is used in various fields such as for a presentation tool, a theater, or a large-screen television.

In such an apparatus, the light source is required to be close to a point light source and to have a long life. The high-pressure discharge lamp has contributed to this.

[0004] For the point light source, there is a method of using a xenon lamp. However, recently, a more efficient high-pressure discharge lamp is disclosed in, for example, Japanese Patent No. 28293.
No. 39, the vapor pressure of mercury was set to 2
High pressure discharge lamps having an ultra-high pressure of 00 bar and containing halogen have come to be used. In this high-pressure discharge lamp, the enclosed halogen prevents the tungsten forming the electrode from evaporating due to the electrode temperature at the time of lighting, and suppresses blackening caused by solidification on the inner wall surface of the light-transmitting discharge vessel. It states that it can be done.
In addition, by enclosing a metal halide having a lighting spectrum in a wavelength range of 580 to 780 nm,
It is also described in the above-mentioned publication that the red component is increased and light emission having excellent color rendering properties is obtained.

The improvement of the life of the high-pressure discharge lamp is described in Japanese Patent Application Laid-Open No. Hei 6-52830 and Japanese Patent No. 298.
Japanese Patent Application Laid-Open No. 0882 discloses that an appropriate amount of halogen is sealed to improve the illuminance maintenance rate of screen illuminance.

Further, regarding the halide to be sealed, sealing with CH ₂ Br ₂ gas is disclosed in JP-A-8-2458.
No. 40 discloses this.

[0007]

However, according to the study of the present inventor, if the alkali metal encapsulated as a discharge medium or as an impurity is present inside a light-transmitting discharge vessel, the alkali metal is reduced. It becomes a devitrification nucleus on the inner wall of the translucent discharge vessel, and the devitrification spreads from the nucleus. For this reason, the quartz glass forming the light-transmitting discharge vessel becomes clouded in several hundred hours of lighting. In addition, it was found that the occurrence of white turbidity developed to blackening of the light-transmitting discharge vessel, and these were synergistically affected, resulting in a decrease in screen illuminance.

[0008] On the other hand, the reason why the alkali metal is present as an impurity is in what form the halogen is encapsulated. That is, for example, the amount of halogen and the method of sealing disclosed in JP-A-6-52830 are as follows.
Although it can be manufactured relatively easily,
As described in Japanese Patent Publication No. 80882, even if a prototype is produced many times, the screen illuminance is remarkably reduced by lighting for several hundred hours, and the object cannot be achieved.

Further, the halogen encapsulation amount and encapsulation method disclosed in Japanese Patent No. 2980882 can be manufactured relatively easily. In this case, the screen illuminance is significantly reduced, and the object cannot be achieved. This is because, in the method of sealing in the form of mercury bromide described in Japanese Patent No. 2980882, an alkali metal is mixed as a material impurity, and the amount is limited to that of Patent No. 2980882.
This is because the intensity reaches a level at which a strong luminous intensity is exhibited as described in JP-A-829339.

[0010] From the above, in order to improve the life of a high-pressure discharge lamp that performs ultrahigh-pressure mercury vapor discharge, regardless of whether or not it is intentionally sealed as a discharge medium (that is, impurities), the alkali metal is used. Alternatively, it is important that the alkali metal halide is not encapsulated. Also,
In applications where this type of high-pressure discharge lamp is used as a light source,
Since light emission of a relatively high color temperature is used, it is not necessary to increase the red component by enclosing a metal halide having a lighting spectrum in a wavelength range of 580 to 780 nm even at the expense of life.

On the other hand, of the encapsulation methods in the prior art, C
When H ₂ Br ₂ gas is mixed with a rare gas and sealed, 50
00 ppm is the limit in the production method and cost. However, this is not always sufficient for the required halogen encapsulation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a high-pressure discharge lamp having an improved luminous flux maintenance factor and a long life, a method of manufacturing the high-pressure discharge lamp, and a lighting device.

It is another object of the present invention to provide a method for manufacturing a high-pressure discharge lamp capable of enclosing a large amount of CH ₂ Br ₂ to a desired degree.

[0014]

According to a first aspect of the present invention, there is provided a high-pressure discharge lamp comprising: a light-transmitting discharge vessel having first and second decompression sealing portions at both ends of which a sealing metal foil is hermetically embedded; A pair of electrodes whose base ends are connected to the sealing metal foils of the first and second decompression sealing portions and sealed inside the translucent discharge vessel; and that the mercury vapor pressure at the time of lighting is at least 15 MPa or more. Concentration (g / m ³ ) of mercury, rare gas and halogen per unit internal volume of the light-transmitting discharge vessel contains a halide or halogen of 8 or more and affects the emission spectrum in the wavelength range of 580 to 780 nm. And a discharge medium containing no alkali metal or alkali metal halide.

In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

<Translucent Discharge Vessel> A translucent discharge vessel is a discharge vessel made of quartz glass.
If necessary, it is permissible to form a halogen-resistant or metal-resistant transparent coating on the inner surface of the translucent quartz glass discharge vessel or to modify the inner surface.

The light-transmitting discharge vessel has an enclosing portion at the center in the longitudinal direction, and first and second decompression sealing portions formed at both ends of the enclosing portion. The surrounding part forms a space surrounding the discharge space inside. The space can be preferably formed in a shape like a sphere or a spheroid. The first and second decompression sealing portions extend in a rod shape from the surrounding portion, support electrodes to be described later inside, seal both ends of the quartz glass discharge vessel, and further connect an introduction conductor to the electrodes. ing. To this end, it is possible to seal the quartz glass discharge vessel by connecting the electrode and the introducing conductor with a sealing metal foil interposed therebetween, and sealingly sealing the quartz glass of the sealing portion to the sealing metal foil. it can. In this case, the pressure resistance can be increased by using a reduced pressure sealing method.

<Regarding a Pair of Electrodes> The high-pressure discharge lamp of the present invention may be operated by either AC lighting or DC lighting. Further, the electrode can be formed of tungsten, thorium tungsten, or doped tungsten.

In the case of AC lighting, the pair of electrodes can be formed in a symmetric structure. Each electrode is generally composed of an electrode shaft and a coil wound around the tip of the electrode shaft. However, if necessary, the coil portion can be omitted by replacing the structure with the protruding portion of the cut-out structure or by using only the electrode shaft portion.

On the other hand, in the case of DC lighting, one of the pair of electrodes is an anode and the other is a cathode. Since the temperature of the anode becomes high due to the heat generated by the inflow of electrons that occupy most of the lamp current, the anode is generally formed relatively large in order to increase the heat radiation area. An anode can be formed by shaving a relatively large diameter rod of tungsten to form an anode, or a coil formed by winding a tungsten thin wire around the tip of a tungsten rod to form an anode. On the other hand, the cathode is formed by a tungsten rod having a relatively small diameter because the cathode emits thermoelectrons and occupies a small part of the lamp current.

In the present invention, the distance between the electrodes is sealed such that a so-called short arc discharge occurs. In the short arc type, the arc discharge region forming the light emitting portion can be reduced by reducing the distance between the electrodes formed in the translucent discharge vessel. For this reason, the light emission of the high-pressure discharge lamp can be made as close as possible to the point light source, so that the light can be efficiently condensed by an optical system such as a reflecting mirror or a lens. For projection such as a liquid crystal projector, a small short arc type high pressure discharge lamp is used, and the distance between the electrodes is preferably 3 mm or less. When the distance between the electrodes exceeds 4 mm, the distance from the point light source is increased, and the focus characteristic of the optical system is deteriorated. When used for a liquid crystal projector, the screen illuminance is reduced. In addition, optimally, it is 0.5 to 2.0 mm.

Further, when the quartz glass of the first and second decompression sealing portions is welded to the electrode shaft portion, cracks tend to occur in the quartz glass due to the difference in thermal expansion coefficient between the two, thereby preventing deflection of the electrode. Care should be taken not to weld, only to the extent supported. Further, as means for making the quartz glass less likely to be welded to the electrode shaft, a thin tungsten wire may be wound around the electrode shaft at a large pitch, and the quartz glass may be loosely contacted from above.

<Regarding the Discharge Medium> In the present invention, the discharge medium sealed in the translucent discharge vessel is mercury, a rare gas,
It is configured to contain a halide or a halogen.

Mercury is encapsulated in such an amount that a desired lamp voltage is obtained. For example, it is preferable that 0.18 mg / mm ³ or more of the inner volume of the quartz glass discharge vessel be sealed.

As the rare gas, one kind or a mixture of plural kinds such as argon, krypton and xenon can be used.

The halide or halogen is selected from I, Br
One or more of Cl and Cl, preferably Br
Consisting of a halide or a simple halogen. And
When the halide or the halogen to be enclosed has a concentration (g / m ³ ) of 8 per unit internal volume of the translucent discharge vessel,
Encapsulate as described above. When the concentration of the halide is less than 8 (g / m ³ ), the yield of non-defective products decreases rapidly. The "non-defective rate" means that after a lighting test for a predetermined time (for example, a cycle of lighting for 12 hours and lighting for 15 minutes is repeated and continuously performed for 72 hours), a black color is observed on the translucent discharge container by observation with a microscope. A high-pressure discharge lamp in which neither whitening nor clouding is observed. Therefore,
The “non-defective rate” refers to a ratio of all non-defective items.

Alkali metals such as sodium and lithium are substances that generate an emission spectrum in the wavelength range of 580 to 780 nm, regardless of whether these metals or halides are intentionally sealed as a so-called discharge medium. Nevertheless, the amount which affects the emission spectrum distribution of the high-pressure discharge lamp must not be enclosed. In the present invention, “wavelength 580 to 780n
m to the extent that it affects the emission spectrum in the range of m. "
In a graph showing a spectral distribution as shown in FIG. 2 described later, when the relative power in a wavelength region including a wavelength of 546.5 nm is set to 100, the wavelength is 580 when the alkali metal or the alkali metal halide is sealed.
It means that the relative power has changed by more than 5 in a part of the range of ７780 nm. The configuration for preventing alkali metal or alkali metal halide from affecting the emission spectrum distribution of the high-pressure discharge lamp is not particularly limited, but can be realized by, for example, a manufacturing method described later.

<Other Configurations of the Present Invention> Although not essential components of the present invention, the following configurations can be added as necessary.

1. Concave Reflector A concave reflector can be added to the high-pressure discharge lamp to collect light emitted from the high-pressure discharge lamp. The concave reflecting mirror is suitably fixed in a predetermined positional relationship with respect to the high-pressure discharge lamp by fixing means such as an inorganic adhesive such as a die cement. However, if necessary, both can be integrally fixed in a detachable form.

In order to fix the high-pressure discharge lamp to the concave reflecting mirror, a base fixed to the sealing portion of the translucent discharge vessel can be used. The high-pressure discharge lamp may be disposed so as to be completely housed in the concave reflecting mirror, or a part of the high-pressure discharging lamp may protrude from the reflecting mirror to the outside.

Further, as the concave reflecting mirror, one having glass or metal as a base can be used.
In any configuration, for example, by employing a dichroic mirror having visible light reflection / heat ray transmission performance on the reflection surface, it is possible to reduce the projection of heat rays on the illuminated surface.

Further, a light-transmitting front cover can be provided at the front opening of the concave reflecting mirror. In this case, the space between the concave reflecting mirror and the translucent front cover can be made airtight. However, it does not have to be airtight. Then, in order to fix the translucent front cover to the concave reflecting mirror, the translucent front cover may be adhered with a silicone adhesive or low-melting glass, or may be mechanically fixed with a metal frame. In addition, visible light can be transmitted to the inner or outer surface of the transparent front cover.
By forming the heat ray reflection film, heat rays projected on the surface to be illuminated can be more effectively blocked. If necessary, the transparent front cover may be provided with a color filter function of favorably transmitting light in a specific wavelength range with respect to visible light.

(2) Outer tube The high-pressure discharge lamp of the present invention can be housed in the outer tube. In this case, the purpose of the outer tube for the purpose of mechanical protection of the high pressure discharge lamp, blocking of ultraviolet rays, temperature control, and the like is not limited. Also, how to make the atmosphere in the outer tube
It can be suitably configured in light of its purpose. For example, if you want mechanical protection or UV protection,
There is no need to seal the inside of the outer tube against outside air. When the purpose is to control the temperature of the high-pressure discharge lamp, the inside can be evacuated to a vacuum atmosphere or a reduced pressure atmosphere of an inert gas.

<Function of the Present Invention> In the present invention, the concentration of halogen to be sealed is set to 8 (g / m ³ ) or more, and the wavelength of the emission spectrum is 580 to 780 nm.
Since the alkali metal is not sealed to such an extent as to affect the range of the electrode, blackening caused by solidification of the inner wall of the light-transmitting discharge vessel due to evaporation of the tungsten of the electrode is effectively suppressed, and the permeability of the alkali metal is suppressed. The clouding of the inner wall of the light discharge container can be effectively suppressed. Moreover, since the blackening suppression and the clouding suppression act synergistically, the screen illuminance can be maintained at a high value. As a result, the luminous flux maintenance factor is significantly improved, so that the high pressure discharge lamp has a long life.

According to a second aspect of the present invention, there is provided a high-pressure discharge lamp according to the first aspect, wherein the alkali metal or the alkali metal halide is at least one of sodium and lithium or a halide thereof. And

The present invention specifies an alkali metal that can affect the emission spectrum in the wavelength range of 580 to 780 nm. Since these metals are likely to be mixed as impurities when the discharge medium is sealed, it is necessary to pay close attention to the sealed form.

Thus, in the present invention, when the discharge medium is sealed, it is likely to be mixed as an impurity,
It is possible to obtain a high-pressure discharge lamp free from undesired problems caused by these alkali metals that can affect the emission spectrum in the range of ７780 nm.

A high pressure discharge lamp according to a third aspect of the present invention is the high pressure discharge lamp according to the first or second aspect, wherein the halide is CH ₂ Br ₂ .

In the present invention, since the halide is the above-mentioned substance, it can be mixed with a rare gas and sealed, and can be easily prevented from being mixed as an impurity of an alkali metal.

According to a fourth aspect of the present invention, there is provided a method for manufacturing a high pressure discharge lamp, wherein the first sealing tube of the light-transmitting discharge vessel bulb having the first and second sealing tubes at both ends of the enclosing portion. A first electrode mount having the base end of the electrode connected to the tip of the sealing metal foil and the lead wire connected to the base end is inserted, and the first electrode mount is sealed by vacuum sealing.
A first sealing step of forming a reduced-pressure sealing portion, and a second electrode mount formed by connecting the base end of the electrode to the tip of the sealing metal foil and connecting the lead wire to the base end of the second sealing. While being inserted into the stop pipe, the second sealing pipe is connected to the exhaust manifold, and the CH ₂ B is inserted into the light-transmitting discharge vessel bulb from the exhaust manifold.
a discharge medium introduction step of introducing r ₂ and a rare gas;
A second sealing step of forming the reduced-pressure sealing portion.

The present invention specifies a method for manufacturing a high-pressure discharge lamp in which a predetermined amount of halogen can be sealed inside a bulb for a light-transmitting discharge vessel while avoiding contamination of impurities, particularly alkali metals. Mercury is, for example, CH ₂ Br
₂ and the rare gas can be introduced into the surrounding portion of the light-transmitting discharge vessel by dropping it through the second sealing tube before being sealed. CH ₂ Br ₂ and the rare gas are
It can be mixed prior to encapsulation.

In the discharge medium introducing step, the second electrode mount 7 is supported on the exhaust head in advance, and then the second sealing tube is connected to the exhaust head. Is inserted at the position of.
Then, CH ₂ Br ₂ and a rare gas are introduced. In addition,
When introducing CH ₂ Br ₂ and the rare gas, the first reduced-pressure sealing portion and the surrounding portion of the light-transmitting discharge vessel bulb may or may not be immersed in liquid nitrogen to be cooled. . Further, before forming the second decompression sealing portion in the second sealing tube, the sealing may be temporarily cut off at a portion relatively close to the exhaust head, or may not be performed.

In the second sealing step, the first reduced-pressure sealing portion and the surrounding portion of the light-transmitting discharge vessel bulb are immersed in liquid nitrogen and the second sealing tube is heated. Accordingly, even if the introduction amount of CH ₂ Br ₂ and the rare gas is large, a large temperature gradient is formed inside the light-transmitting discharge vessel bulb by cooling and heating, so that the discharge medium surely moves into the surrounding portion. And aggregate. CH ₂ B in discharge medium
r ₂ and mercury aggregate and solidify in the enclosure, and the noble gas condenses. Then, while maintaining the state in which the discharge medium is agglomerated in the surrounding portion, vacuum sealing is performed to form a second vacuum sealing portion. As a result, a required amount of the discharge medium can be sealed in the enclosure of the translucent discharge vessel.

Therefore, according to the present invention, even if a large amount of discharge medium is sealed, the discharge medium can be reliably sealed in the surrounding portion of the light-transmitting discharge vessel.

Further, by enclosing the halogen with a halide on the gas of CH ₂ Br ₂ , it is possible to effectively prevent the alkali metal from being encapsulated as an impurity.

According to a fifth aspect of the present invention, there is provided a method for manufacturing a high-pressure discharge lamp, comprising the steps of: After inserting the first electrode mount formed by connecting the base end of the electrode to the front end of the sealing metal foil and connecting the lead wire to the base end, the first pressure reduction sealing portion is formed by pressure reduction sealing. (1) a sealing step; inserting a second electrode mount formed by connecting the base end of the electrode to the tip of the sealing metal foil and connecting the lead wire to the base end into the second sealing tube; Is connected to the exhaust manifold, and the first depressurized sealing part is turned down, immersed in liquid nitrogen up to the surrounding area of the bulb for the light-transmitting discharge vessel, and pre-cooled, and the light-transmitting light is transmitted from the exhaust manifold. CH in discharge vessel bulb
A discharge medium introducing step of introducing ₂ Br ₂ and a rare gas to seal a portion of the sealing tube relatively close to the exhaust head; It is immersed in liquid nitrogen and cooled to the surrounding portion of the discharge vessel bulb, and the second sealing tube is heated to aggregate the internal discharge medium in the surrounding portion. And a second sealing step of forming a reduced-pressure sealing portion.

The present invention specifies a method of manufacturing a high-pressure discharge lamp suitable for enclosing a larger amount of halogen in a translucent discharge vessel while avoiding contamination of impurities, particularly alkali metals. That is, in the present invention, in the discharge medium introducing step, the discharge medium is introduced and the second sealed tube is sealed while pre-cooling the first decompression sealing portion and the surrounding portion using liquid nitrogen. In addition, the amount of the discharge medium that can be introduced into the light-transmitting discharge vessel bulb can be dramatically increased.

Further, in the second decompression sealing step, the enclosing portion and the first decompression sealing portion are cooled with liquid nitrogen and the second sealing tube is heated, so that the enclosing portion and the second encapsulation tube are heated. Since a large temperature gradient is formed between the discharge tube and the stop tube, the discharge medium surely moves to the inside of the enclosure even when the amount of the discharge medium is large. Then, after the discharge medium has moved into the surrounding portion, a second reduced-pressure sealing portion is formed.

Thus, according to the present invention, CH ₂ Br ₂
And the pre-cooling at the introduction of the rare gas to once seal the second sealing tube, and then cool again at the time of decompression sealing,
It is possible to reliably enclose a large amount of discharge medium to the required degree inside the surrounding portion of the translucent discharge vessel.

In the discharge medium introducing step and the second sealing step, the alkali metal is hardly encapsulated as impurities, so that a high-pressure discharge lamp having a long life can be obtained.

According to a sixth aspect of the present invention, there is provided a lighting device, comprising: a lighting device main body; and the high-pressure discharge lamp according to any one of the first to fifth aspects provided in the lighting device main body. And

In the present invention, the illuminating device is a broad concept including any device utilizing the light emission of a high-pressure discharge lamp, and is therefore a light projecting device such as a liquid crystal projector, an overhead projector, a headlight for an automobile,
Lighting equipment, display devices, fiber optic lighting devices, etc. are permitted. Of course, the lighting equipment may be either indoor or outdoor.

Thus, in the present invention, it is possible to obtain a lighting device having improved color characteristics, that is, color rendering and color temperature, without lowering the light collection efficiency and the light emission efficiency.

[0054]

Embodiments of the present invention will be described below with reference to the drawings.

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

In the figure, 1 is a translucent discharge vessel, 2 and 2
Is a pair of electrodes, 3 is a sealing metal foil, 4 is an introduction conductor, 5 is a base, and 6 is a connection conductor.

The translucent discharge vessel 1 is made of quartz glass, and has a central surrounding portion 1a and first and second reduced-pressure sealing portions 1b and 1c at both ends. The first and second sealing portions 1b and 1c are formed integrally at both ends of the surrounding portion 1a by a reduced pressure sealing structure. Note that the first and second
Has a sectional area of 9π (mm ² ).

The electrode 2 comprises an electrode shaft 2a and a coil 2
b. The electrode shaft 2a is a 0.45 mm pure tungsten rod. The coil portion 2b has a 0.15 mm pure tungsten wire wound around the tip of the electrode shaft portion 2a. The distance between the electrodes is set to about 1.4 mm.

The sealing metal foil 3 is made of molybdenum and has a sealing portion length of 20 mm. Then, the sealing metal foil 3 is welded to the base end of the electrode shaft 2a at the tip end and the tip end of the introduction conductor 4 to the base end portion, respectively, to form an electrode mount. Are hermetically buried inside the first and second decompression sealing portions 1b and 1c at both ends.

The encapsulating medium was mercury, argon and CH ₂
Consisting of Br _2. The halogen of CH ₂ Br ₂ is sealed so that the concentration per unit internal volume of the surrounding portion 1a of the translucent discharge vessel 1 is 8 or more.

The leading conductor 4 is made of a molybdenum wire, and the leading end is welded to the base end of the sealing metal foil 3 and the base end is exposed to the outside from the first reduced pressure sealing portion 1b. In addition, introduction conductor 4
Has a symmetrical structure in the figure, but the lead conductor on the right side is not visible from the outside because it is located in the base 5 described later.

The base 5 has a cylindrical body 5a and a screw terminal 5b. The cylindrical body 5a is made of a metal such as brass, and one end of the cylindrical body 5a is fixed to an end of the first reduced-pressure sealing portion 1b by a die cement. The screw terminal 5b has a thread groove formed around it, a base end thereof is fixed to the cylindrical body 5a and protrudes from the cylindrical body 5a to the outside, and is connected to the corresponding introduction conductor 4 inside the screw terminal 5b.

The connection conductor 6 has a first sealing portion 1 at its tip.
The tip is welded to the introduction conductor 4 protruding from the outside b.

FIG. 2 is a graph showing the spectral distribution of the high-pressure discharge lamp according to the first embodiment of the present invention. In the figure, the horizontal axis indicates the wavelength [nm], and the vertical axis indicates the relative power. In the figure, the wavelength is measured by integrating the radiation power every 5 nm, and the wavelength band of the maximum radiation power is 10
The relative power is shown as 0%.

As can be understood from FIG.
In the range of 80 nm, only the continuous emission of mercury does not show the emission spectra of the alkali metals Li and Na, and thus the emission spectra of Li and Na do not affect the emission spectrum of the high-pressure discharge lamp.

FIG. 3 is a graph showing the relationship between the Br concentration (g / m ³ ) and the yield rate (%) in the first embodiment of the high-pressure discharge lamp device of the present invention. In the figure, the horizontal axis shows the Br concentration (g / m ³ ), and the vertical axis shows the non-defective rate (%). In addition, "non-defective" means lighting for 12 hours, 15
After a lighting test in which repetition of minute lighting is repeated for 72 hours, no blackening or white turbidity is observed in the translucent discharge vessel when observed with a microscope. In addition, "good product rate"
Manufactured 100 high-pressure discharge lamps for each Br concentration, performed the lighting test on them,
In this example, 00 pieces are indicated by%.

As can be understood from the figure, the Br concentration (g / g
When m ³ ) is less than 8, the yield rate drops sharply.

Next, a high-pressure discharge lamp of this embodiment and a high-pressure discharge lamp of the same specifications as the high-pressure discharge lamp of this embodiment except that Li was included in the discharge medium as a comparative example were manufactured. Perform, lighting 500, 100
Table 1 shows the measurement results of the illuminance maintenance ratio (%) at 0 and 1500 hours.

[0069]

Table 1 Lighting time 500 hr 1000 hr 1500 hr This embodiment 100% 95% 90% Comparative example 70% 40% 30% As can be understood from Table 1, the high pressure discharge lamp of this embodiment has a high illuminance maintenance rate and a long life. long.

FIG. 4 is an explanatory diagram showing a discharge medium introducing step in the first embodiment of the method for manufacturing a high-pressure discharge lamp of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. Reference numeral 31 denotes a light-transmitting discharge vessel bulb, 32 denotes a second electrode mount, 33 denotes an exhaust manifold, 34 denotes liquid nitrogen, and 35 denotes a liquid nitrogen storage layer.

In this embodiment, the light-transmitting discharge vessel bulb 31 has first and second sealing tubes (only the second sealing tube 31b is shown in the figure) at both ends of the surrounding portion. First, a first electrode mount is inserted into the first sealing tube, and the first sealing tube is sealed by a reduced-pressure sealing method to form a first reduced-pressure sealing portion 1b. I do. In this step, the first sealing tube is facing up.

Next, a discharge medium introducing step and a second sealing step shown in FIG. 4 are performed. That is, the second sealing tube 31b
After the mercury is dropped into the enclosure 1a with the surface facing upward, the second electrode mount 32 is supported by the exhaust head 33, and the second electrode mount 32 is inserted into the second sealing tube 31b. To be supported by the exhaust head 33. Then, the inside of the second sealing tube 31b is evacuated while immersing the first decompression sealing portion 1b and the surrounding portion 1a in the liquid nitrogen 34, and then a mixed gas of argon and CH ₂ Br ₂ is exhausted into the exhaust manifold ( (Not shown)) through the exhaust head 33 to the second sealing pipe 3.
1b. At this time, since the first reduced-pressure sealing portion 1b and the surrounding portion 1a are cooled to a sufficiently low temperature by the liquid nitrogen 34, the introduced discharge medium is coagulated inside the surrounding portion 1a along a large temperature gradient. And mercury and CH
₂ Br ₂ solidifies. Next, the second sealing tube 31b is heated and melted, and sealed by a reduced pressure sealing method to form a second sealed portion.

FIG. 5 is an explanatory view showing a second sealing step in the second embodiment of the method for manufacturing a high-pressure discharge lamp according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In the present embodiment, the step shown in FIG. 4 is a discharge medium introduction step, and then the process shifts to the second sealing step shown in FIG. That is, in the discharge medium introducing step, after introducing the discharge medium from the exhaust manifold 33 into the light-transmitting discharge vessel bulb 31, the end of the sealing tube 31B is sealed, and the temporarily sealed transparent tube shown in FIG. Light emitting vessel bulb 31 '
To form

Next, a second sealing step is performed in FIG. That is, the first decompressed sealing portion 1b and the surrounding portion 1a of the temporarily sealed translucent discharge vessel bulb 31 'are connected to the liquid nitrogen 34.
By heating the portion of the second sealing tube 31b facing the sealing metal foil 3 while cooling by dipping in the second sealing tube 31b to form a large temperature gradient, the discharge medium is aggregated in the surrounding portion and reduced pressure sealing is performed. A second sealing portion is formed by the method, and the second sealing step is completed.

Next, Table 2 shows the measurement results of the amount of halogen enclosed in the first and second embodiments of the method of manufacturing the high-pressure discharge lamp of the present invention, together with those of the comparative example. The comparative example is a method disclosed in JP-A-8-245849. However, in all cases, except for the amount of halogen enclosed in the discharge medium, the first embodiment of the high-pressure discharge lamp of the present invention is used.

[0077]

[Table 2] FIG. 6 is a partial sectional front view showing a second embodiment of the high-pressure discharge lamp of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 11 denotes a high-pressure discharge lamp, 12 denotes a concave reflecting mirror, 13 denotes an inorganic adhesive, 14 denotes a relay terminal, 15 denotes a wire harness, and 16 denotes a front cover.

The high-pressure discharge lamp 11 has the same structure as that shown in FIG.

The concave reflecting mirror 12 comprises a glass substrate 12a having a concave inner surface, a visible light reflecting / heat ray transmitting film 12b, and a cylindrical portion 12c. The glass substrate 12a has a concave portion on the inner surface formed into a curved surface based on a paraboloid of revolution, and a cylindrical portion 12c integrally formed outside the top portion. The visible light reflection / heat ray transmission film 12b is formed of a dichroic reflection film.

To mount the high-pressure discharge lamp 11 on the concave reflecting mirror 12, the base 5 is inserted into the cylindrical portion 12c, and the emission center of the high-pressure discharge lamp 11 is made to coincide with the focal point of the concave reflecting mirror 12, so that the base 5 is mounted. Adhesive 13 between the cylindrical part 12c
To fix both.

The connection conductor 6 is welded to the introduction conductor 5 on one electrode 2 side of the high-pressure discharge lamp 11 and led out to the back side of the concave reflecting mirror 12. That is, the connection conductor 6 is led out to the back side of the concave reflecting mirror 12 through a through hole 12d formed in a part of the mirror surface.

The relay terminal 14 is fixed near the through hole 12d on the outer surface of the concave reflecting mirror 13. The connection between the connection conductor 6 connected to the high-pressure discharge lamp 11 and the wire harness 15 is relayed.

The wire harness 15 is composed of a connector 15a and a pair of insulated conductors 15b and 15c. The connector 15 is detachably connected to and connected to a connector at an output end of a lighting device (not shown), and is also connected to one end of the insulated conductors 15b and 15c. The other end of the insulated conductor 15 b is connected to the relay terminal 14. The other end of the insulated conductor 15c is connected to the screw terminal 5b of the base 5 by being tightened with a knurled nut 5c.

The front cover 16 is made of a transparent glass plate and is adhered to the front opening end of the concave reflecting mirror 12.

When the connector 15a of the wire harness 15 is connected to the lighting device and the high-pressure discharge lamp 11 is turned on, the light rays generated from the high-pressure discharge lamp 11 The light enters the reflective film 12b, and the visible light is reflected and emitted in parallel with the optical axis, passes through the front cover 16, and is used for illumination. On the other hand, heat rays are transmitted through the visible light reflection / heat ray transmitting film 12b, further transmitted through the glass substrate 12a, and radiated to the back side of the concave reflecting mirror 12, thereby suppressing a rise in temperature of the liquid crystal display and the like. can do.

FIG. 7 is a conceptual sectional view showing a liquid crystal projector as one embodiment of the illumination device of the present invention.

In the figure, 21 is a high-pressure discharge lamp, 22
Is a liquid crystal display, 23 is an image controller, 24 is an optical system,
25 is a high pressure discharge lamp lighting device, 26 is a main body case, 2
7 is a screen.

The high pressure discharge lamp 21 is the same as that of the second embodiment of the present invention shown in FIG.

The liquid crystal display means 22 displays an image to be projected by liquid crystal, and is illuminated from the back by a high-pressure discharge lamp device 21.

The image control means 23 drives and controls the liquid crystal display means 22, and may have a television receiving function if necessary.

The optical system 24 projects the light passing through the liquid crystal display means 22 onto a screen 27.

The high pressure discharge lamp lighting device 25 turns on the high pressure discharge lamp 21.

The main body case 26 is provided with each of the above elements 21 to 2
6 is stored.

[0095]

According to the first to third aspects of the present invention, a light-transmitting discharge vessel having first and second decompression sealing portions at both ends and a first and second decompression sealing base are provided. A pair of electrodes connected to the sealing metal foil of the stop portion and sealed inside the translucent discharge vessel, and mercury, a rare gas and a translucent discharge vessel having a mercury vapor pressure of at least 15 MPa or more when turned on. It contains a halide or halogen having a halogen concentration per unit volume (g / m ³ ) of 8 or more and has a wavelength of 580 to 78.
By providing a discharge medium containing no alkali metal or alkali metal halide to such an extent as to affect the emission spectrum in the range of 0 nm, the luminous flux maintenance factor is improved and a long-life high-pressure discharge lamp is provided. Can be provided.

According to the second aspect of the present invention, since the alkali metal or the alkali metal halide is at least one of sodium and lithium or a halide thereof, the alkali metal or the alkali metal halide is mixed as an impurity when the discharge medium is sealed. It is possible to provide a high-pressure discharge lamp that is easy and has no undesired problems due to these alkali metals, which can affect the emission spectrum in the wavelength range of 580 to 780 nm.

According to the third aspect of the present invention, in addition, since the halide is CH ₂ Br _2, it is possible to provide a high-pressure discharge lamp which is easy to be mixed with a rare gas and sealed in a translucent discharge vessel. .

According to the fourth aspect of the present invention, the first sealing step of forming the first reduced-pressure sealing portion, and the second sealing pipe of the light-transmitting discharge vessel bulb is connected to the exhaust manifold. ,And,
Dipping the first vacuum sealing portion and the surrounding portion in liquid nitrogen
A discharge medium introduction step of introducing a discharge medium for introducing H ₂ Br ₂ and a rare gas, and a second step of forming a second reduced pressure sealing portion.
Of the required amount of CH
_A method for manufacturing a high-pressure discharge lamp capable of enclosing ₂ Br ₂ can be provided.

According to the fifth aspect of the present invention, the first reduced pressure sealing
A first sealing step of forming a portion, and a bulb for a light-transmitting discharge vessel.
Connected to the exhaust manifold at the second sealing pipe of the valve, and
Immerse the first decompression sealing part and the surrounding part in liquid nitrogen and reserve
CH while cooling₂Br ₂And introducing rare gas
Seal the portion of the sealing tube relatively close to the exhaust head
The discharge medium introduction step, and the first reduced pressure sealing portion and the surrounding portion
Cooling by immersing in liquid nitrogen and then a second sealing tube
Is heated to aggregate the discharge medium in the surrounding portion, and then the second
And a second sealing step of forming a reduced pressure sealing portion.
As a result, a large amount of CH₂Br₂Can be enclosed
Thus, a method for manufacturing a high-pressure discharge lamp can be provided.

According to the invention of claim 6, it is possible to provide a lighting device having the effects of claims 1 to 3.

[Brief description of the drawings]

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

FIG. 2 is a graph showing a spectral distribution of the high-pressure discharge lamp according to the first embodiment of the present invention.

FIG. 3 is a graph showing a relationship between a Br concentration (g / m ³ ) and a non-defective rate (%) in the first embodiment of the high-pressure discharge lamp device of the present invention.

FIG. 4 is a process explanatory view showing a discharge medium introducing step in the first embodiment of the method for manufacturing a high-pressure discharge lamp of the present invention.

FIG. 5 is a process explanatory view showing a second sealing step in a second embodiment of the method for manufacturing a high-pressure discharge lamp of the present invention.

FIG. 6 is a partial sectional front view showing a second embodiment of the high-pressure discharge lamp of the present invention.

FIG. 7 is a conceptual cross-sectional view showing a liquid crystal display device as one embodiment of the lighting device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Translucent discharge container 1a ... Surrounding part 1b ... 1st pressure reduction sealing part 1c ... 2nd pressure reduction sealing part 2 ... Electrode 2a ... Electrode shaft part 2b ... Coil part 3 ... Sealing metal foil 4 ... Introduction Conductor 5 ... Base 5a ... Cylinder 5b ... Screw terminal 6 ... Connection conductor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satoko Ishikawa 5-2-2 Asahi-cho, Imabari-shi, Ehime 1 Harrison Toshiba Lighting Corporation (72) Inventor Tetsuo Otani 5-2-2 Asahi-cho, Imabari-shi, Ehime (1) Harrison Toshiba Lighting Co., Ltd. (72) Inventor Hisashi Kotobuki 5-chome, Asahimachi, Imabari-shi, Ehime Prefecture 2 in 1 Harrison Toshiba Lighting Co., Ltd. (72) Inventor Yasutaka Gogami 5-chome, Imabari-City, Ehime Prefecture 2-1-2 in 1 Harrison Toshiba Lighting Co., Ltd. (72) Inventor Nansei Murase Asahi, Imabari-shi, Ehime F-term (reference) in 1 Harrison Toshiba Lighting Co., Ltd., 5-chome 2-chome 5C012 SS01 TT05 5 C015 QQ02 QQ03 QQ33 QQ34 QQ35 QQ36

Claims (6)

[Claims] 1. A light-transmissive discharge vessel having first and second decompression-sealed portions at both ends in which a sealing metal foil is buried in an airtight manner; and a first and second decompression-sealed base end. A pair of electrodes connected to the sealing metal foil of the portion and sealed inside the translucent discharge container; units of mercury, a rare gas, and the translucent discharge container having a mercury vapor pressure of at least 15 MPa or more when turned on. It contains a halide or halogen having a halogen concentration (g / m ³ ) of 8 or more per internal volume and has a wavelength of 580 to 780.
a discharge medium containing no alkali metal or alkali metal halide to such an extent that the emission spectrum in the range of nm is affected. 2. The high-pressure discharge lamp according to claim 1, wherein the alkali metal or the alkali metal halide is at least one of sodium and lithium or a halide thereof. 3. The high pressure discharge lamp according to claim 1, wherein the halide is CH ₂ Br ₂ . 4. A base end of an electrode at a distal end of a sealing metal foil in a first sealing tube of a light-transmitting discharge vessel bulb having first and second sealing tubes at both ends of an enclosing portion. A first sealing step of inserting a first electrode mount formed by connecting and connecting an introductory wire to a base end, and forming a first decompression sealing portion by decompression sealing; A second electrode mount formed by connecting the base end of the electrode and connecting the lead wire to the base end is inserted into the second sealing tube, and the second sealing tube is connected to the exhaust manifold to transmit light. A discharge medium introducing step of introducing CH ₂ Br ₂ and a rare gas from the exhaust manifold into the discharge vessel bulb; and a second decompression sealing of the second sealing pipe of the light-transmitting discharge vessel bulb under reduced pressure. And a second sealing step of forming a stop portion. 5. A base end of an electrode at a distal end of a sealing metal foil in a first sealing tube of a light-transmitting discharge vessel bulb having first and second sealing tubes at both ends of an enclosing portion. A first sealing step in which a first electrode mount formed by connecting and connecting a lead wire to the base end is inserted, and then a first reduced-pressure sealing portion is formed by reduced-pressure sealing; A second electrode mount formed by connecting the base end of the electrode to the distal end and connecting the lead wire to the base end is inserted into the second sealing tube, and the second sealing tube is connected to the exhaust manifold. 1 is immersed in liquid nitrogen up to the surrounding portion of the bulb for the light-transmitting discharge vessel with the pressure-reducing sealing part downward, and CH ₂ Br ₂ and the rare earth are introduced from the exhaust manifold into the bulb for the light-transmitting discharge vessel while pre-cooling. A discharge medium introduction step of introducing a gas to seal a portion of the sealing tube relatively close to the exhaust head; Immerse in liquid nitrogen with the pressure sealing part down to the surrounding part of the bulb for the translucent discharge vessel, cool it, and heat the second sealing tube to aggregate the internal discharge medium in the surrounding part. And a second sealing step of forming a second reduced-pressure sealed portion by reduced-pressure sealing. 6. A lighting device comprising: a lighting device main body; and the high-pressure discharge lamp according to claim 1 disposed in the lighting device main body.