KR20090024082A - Metal halide lamp - Google Patents

Abstract

A metal halide lamp is provided to perform a stable discharge with a uniform luminance distribution by preventing a separated luminance. A discharge medium is sealed inside a light emitting tube(2). The discharge medium is rear gas, mercury, and thallium iodide. Electrodes(3, 4) for discharging are installed in both ends of a tube axis direction of the light emitting tube. A light emitting length of the light emitting tube is more than 800mm. The rare gas is an argon gas or a xenon gas.

Description

Metal Halide Lamp {METAL HALIDE LAMP}

The present invention relates to a metal halide lamp.

Metal halide lamps in which a rare gas, mercury, and thallium iodide are enclosed in an airtight light emitting tube and discharge electrodes are provided at both ends in the tube axis direction of the light emitting tube have ultraviolet light emission having a high emission intensity around 365 nm. Since it is generated, it is useful as a light source used for curing an ultraviolet curable paint, photoreaction to a functional polymer film having a high market use, and the like. As one of these kinds of uses, in the use as a light source for manufacturing a panel of a liquid crystal display device, an increase in the lamp emission length is required in response to the expansion of the panel size.

By the way, in this type of metal halide lamp, mercury, which is a sealing medium, reacts with quartz constituting the valve to blacken the valve inner surface, thereby shortening the life of the lamp. However, in the case of containing thallium iodide as the sealing medium, the thallium ions remain in the vicinity of the tube wall and prevent the recombination of mercury and other metal ions in the quartz tube wall, which has the advantage of measuring the life of the lamp.

However, such a metal halide lamp containing thallium iodide such as a so-called separate light emission phenomenon occurs in which the light emission of mercury and thallium iodide is separated during lighting, so that uniform lamp light emission in the axial direction of the lamp cannot be obtained. There is a flaw. This separated light emission phenomenon is particularly remarkable when the lamp length is increased.

In addition, when the lamp length is increased, there is a problem that the arc under discharge does not remain in a straight line along the tube axis, and that so-called arc vibration occurs, in which an ups and downs are generated about the axis. When such an arc vibration occurs, an arc approaching the tube wall locally overheats the valve and causes a hole in the tube wall, resulting in a shortened lamp life.

[Patent Document 1] Japanese Unexamined Patent Publication No. 06-275234

SUMMARY OF THE INVENTION The present invention has been made in view of the above technical problem, and an object thereof is to provide a long metal halide lamp which can prevent separate light emission, and which is capable of long life and stable discharge.

The metal halide lamp of the present invention encloses a rare gas, mercury, and thallium iodide as a discharge medium in an airtight light emitting tube, and provides discharge electrodes at both ends in the tube axis direction of the light emitting tube, and has a light emission length of 800 mm or more. For halide lamps,

The loading amount (Mh) (mg / cc) of the mercury (Hg) and the loading amount (Mt) (mg / cc) of the thallium iodide (TlI) are respectively in the following ranges.

0.3 mg / cc <Mh <5.0 mg / cc

0.006 mg / cc <Mt <0.048 mg / cc

It is characterized by being selected within.

In the metal halide lamp of the present invention, when the inner diameter of the light emitting tube is D mm and the sealing gas pressure is P torr, the values of P and D are represented by the following equation.

75 <P × D <2125

It is characterized by selecting to satisfy.

According to the present invention, separate light emission can be prevented, a stable discharge can be maintained with a uniform light emission distribution along the tube axis, and there is no deterioration in reliability due to blackening of mercury, thereby providing a long-life metal halide lamp. .

In addition, according to the present invention, it is possible to provide a long metal halide lamp that can prevent arc vibration, and can maintain a long life and stable discharge.

(1st embodiment)

EMBODIMENT OF THE INVENTION Hereinafter, 1st Embodiment of this invention is described in detail based on drawing. 1 shows a metal halide lamp 1 according to an embodiment of the present invention. The metal halide lamp 1 is made of refractory metals such as tungsten, nickel, molybdenum and tantalum, or metals such as stainless steel and titanium at both ends of the inner side of the quartz tube 2 having ultraviolet rays. Electrodes 3 and 4 are arranged, and the sockets 5 and 6 are provided outside, respectively.

As an example of the specification of this metal halide lamp 1, the lamp emission length is 1000 mm, the inner diameter is 25 mm, the lamp voltage to be applied is 1275 V and the lamp current value is 13.5 A. Incidentally, the encapsulation gas contains argon as a rare gas component, and 0.032 mg / cc of thallium iodide and 1.68 mg / cc of mercury are added thereto. The gas pressure P (torr) of the rare gas is 250 torr.

Mercury loading (Mh) (mg / cc) and thallium iodide loading (Mt) (mg / cc) were 0.3 mg / cc <Mh <5.0 mg / cc and 0.006 mg / cc <Mt <0.048 mg, respectively. Select within the range of / cc.

The present inventors conducted experiments in which the amount of mercury and thallium iodide was changed and the lamp was operated to observe the occurrence of separated luminescence. When the amount of mercury and thallium iodide was contained in these ranges, it was confirmed that no separate luminescence occurred. It was.

EXAMPLE

Hereinafter, the Example which applied this invention to ten types of prototypes is demonstrated.

Table 1 shows the composition ratio in the case where the loading amounts of mercury (Hg) and thallium iodide (TlI) for each of the ten kinds of prototypes ① to ⑩ are changed.

Table 1

Start lamp specification

In Table 1, prototypes ③, ⑤, ⑥ to ⑩ are examples, and prototypes ①, ②, ④ and ⑤ are comparative examples.

In addition, Table 2 is a table which shows the electrical property at the time of operation | movement of each prototype and the presence or absence of the separate light emission.

[Table 2]

Electrical characteristics and presence of separated luminescence

2 (a) to 2 (g) are graphs showing the spectral distributions at the start numbers ③, ⑤, and ⑥ to ⑩. These graphs are graphs showing the spectral distribution in the left and right electrode portions of each prototype lamp. In these graphs, the spectral distribution of the start number (5) which is one of the comparative examples showed the spectral distribution from which left and right differed, and has shown that the separated luminescence has generate | occur | produced. On the other hand, the spectral distributions of the start numbers ③, ⑥ to ⑩ which are the examples of the present invention show the same spectral distribution to the left and the right, indicating that no separate emission occurs.

From these experimental results, in a metal halide lamp having a rare gas, mercury, and thallium iodide as a discharge medium, and having a light emission length of 800 mm or more, the amount of mercury (Mh) (mg / cc) and the amount of thallium iodide ( Mt) (mg / cc) can be selected within the ranges of 0.3 mg / cc <Mh <5.0 mg / cc and 0.006 mg / cc <Mt <0.048 mg / cc, respectively, to suppress the undesired separation luminescence phenomenon. It was confirmed that there was.

(2nd embodiment)

Next, a second embodiment of the present invention will be described.

In the present embodiment, as a result of examining the relationship between the amount of encapsulation of the entire discharge medium, the separated light emission phenomenon, and the arc vibration, 75 <P × D Only the amount of the range which satisfies <2125 (Pascal conversion, 75x133.320 <PxD <2125x133.320) is enclosed. For example, in the case of inner diameter D = 15 mm, the sealing pressure P of rare gas shall be 5 torr (about 667 kPa) or more, and even if inner diameter D = mm, the sealing pressure P of rare gas will be. It is preferable to set it as 60 torr (about 8000 Pa) or less. Moreover, when inner diameter D = 25 mm, it was confirmed that it is suitable to set sealing pressure P of rare gas = 10 torr (about 1332 kPa).

When the amount of rare gas is encapsulated, the blackening of mercury occurs remarkably, and the reliability is low. However, when P × D is set to 75 or more, the rare gas can be enclosed to the extent that the effect of blackening does not occur. I can keep it. In addition, the diffusion of mercury and thallium iodide is facilitated, and light emission of the lamp can be stably maintained without causing arc vibration. On the other hand, when the amount of inclusion of the rare gas is increased until P × D exceeds 2125, the starting and restarting characteristics of the lamp deteriorate, and the separated light emission is remarkable. Therefore, by adjusting the amount of filling of the rare gas so that the gas pressure P and the lamp tube diameter D are in the range of 75 <P x D <2125, there is no degradation of reliability due to blackening, and no separate light emission occurs. Therefore, a metal halide lamp having excellent starting and restarting characteristics can be obtained.

Below, the experiment result at the time of determining the optimum range of PxD is shown.

[First Embodiment]

Table 3

Lamp length: 850 mm Lamp inner diameter: 25 mm Lamp current: 113.5 A Lamp voltage: 1130 V

Tallium iodide: 0.032 mg / cc, mercury: 1.68 mg / cc Encapsulated gas: argon

In the first embodiment, argon gas is 2.5 torr (about 333 kPa), 5 torr (about 667 kPa), and 10 torr for the metal halide lamp having a lamp length of 850 mm and a lamp inner diameter of 25 mm as shown in the above table. 1333 kPa), 30 torr (about 4000 kPa), 40 torr (about 5328 kPa), 60 torr (about 8000 kPa), 80 torr (about 10656 kPa), 90 torr (about 11988 kPa) A luminescence test was done.

As a result, in the case of the metal halide lamp whose PxD (mm * torr) is 62.5, blackening was remarkable and it was determined that reliability was low. In the case of a metal halide lamp having a P x D (mm x torr) of 2250, blackening was not recognized, but separate light emission occurred, and operation characteristics of starting and restarting were also deteriorated. It was determined.

On the other hand, in the case of the metal halide lamps having a P x D (mm x torr) of 125 to 2000, it was confirmed that there was no separate light emission, good operating characteristics of starting and restarting, and good lamp characteristics without blackening. there was.

Second Embodiment

Table 4

Lamp length: 1000 mm Lamp inner diameter: 25 mm Lamp current: 13.5 A Lamp voltage: 11330 V

Tallium iodide: 0.032 mg / cc Mercury: 1.68 mg / cc Encapsulated gas type: Argon

In the second embodiment, argon gas is 2.5 torr (about 333 kPa), 5 torr (about 667 kPa), and 10 torr (about 1000 mm) for a metal halide lamp having a lamp length of 1000 mm and a lamp inner diameter of 25 mm as shown in the above table. 1333 kPa), 30 torr (about 4000 kPa), 40 torr (about 5328 kPa), 60 torr (about 8000 kPa), 80 torr (about 10656 kPa), 90 torr (about 11988 kPa) A luminescence test was done.

As a result, in the case of the metal halide lamp whose PxD (mm * torr) is 62.5, blackening was remarkable and it was determined that reliability was low. In the case of a metal halide lamp having a P x D (mm x torr) of 2250, blackening was not recognized, but separate light emission occurred, and the operating characteristics of the start-up and restart were also significantly deteriorated. It was determined.

On the other hand, in the case of the metal halide lamps having a P x D (mm x torr) of 125 to 1500, it was confirmed that they exhibit good lamp characteristics without separate light emission, good operation characteristics of starting and restarting, and no blackening. there was. In addition, in the case of a metal halide lamp having a P x D (mm x torr) of 2000, a slight decrease was observed in the starting and restarting characteristics, but no separate light emission occurred and blackening was not recognized. It was determined that.

Third Embodiment

Table 5

Lamp length: 11000 mm Lamp inner diameter: 25 mm Lamp current: 13.5 A Lamp voltage: 1330 V

Tallium iodide: 0.032 mg / cc, mercury: 1.68 mg / cc Encapsulated gas: xenon

In the third embodiment, the xenon gas is 2.5 torr (about 333 kPa), 5 torr (about 667 kPa), and 10 torr for the metal halide lamp having the lamp length of 1000 mm and the lamp inner diameter of 25 mm as shown in the above table. 1333 kPa), 30 torr (about 4000 kPa), 40 torr (about 5328 kPa), 60 torr (about 8000 kPa), 80 torr (about 10656 kPa), 90 torr (about 11988 kPa) A luminescence test was done.

As a result, in the case of the metal halide lamp whose PxD (mm * torr) is 62.5, blackening was remarkable and it was determined that reliability was low. In the case of a metal halide lamp having a P x D (mm x torr) of 2250, blackening was not recognized, but separate light emission occurred, and the operating characteristics of the start-up and restart were also significantly deteriorated. It was determined.

On the other hand, in the case of the metal halide lamps having a P x D (mm x torr) of 125 to 1500, it was confirmed that they exhibit good lamp characteristics without separate light emission, good operation characteristics of starting and restarting, and no blackening. there was. In addition, in the case of a metal halide lamp having a P x D (mm x torr) of 2000, a slight decrease was observed in the starting and restarting characteristics, but no separate light emission occurred and blackening was not recognized. It was determined to be good.

[Example 4]

Table 6

Lamp length: 1800 mm Lamp inner diameter: 25 mm Lamp current: 13.5 A Lamp voltage: 2400 V

Tallium iodide: 0.032 mg / cc, mercury: 1.68 mg / cc Encapsulated gas: argon

In the fourth embodiment, argon gas is 2.5 torr (about 333 kPa), 5 torr (about 667 kPa), and 10 torr for the metal halide lamp having the lamp length of 1800 mm and the lamp inner diameter of 25 mm as shown in the above table. 1333 kPa), 30 torr (about 4000 kPa), 40 torr (about 5328 kPa), 75 torr (about 10000 kPa), 85 torr (about 11332 kPa), 90 torr (about 11988 kPa) A luminescence test was done.

As a result, in the case of the metal halide lamp whose PxD (mm * torr) is 62.5, blackening was remarkable and it was determined that reliability was low. In the case of a metal halide lamp having a P x D (mm x torr) of 2250, blackening was not recognized, but separate light emission occurred, and the operating characteristics of the start-up and restart were also significantly deteriorated. It was determined.

On the other hand, in the case of each metal halide lamp having a P x D (mm x torr) of 125 to 1875, it can be confirmed that there is no separate light emission, the operation characteristics of start-up and restart are good, and the lamp characteristics exhibit good lamp characteristics without blackening. there was. In addition, in the case of a metal halide lamp having a P x D (mm x torr) of 2125, slight deterioration was observed in the starting and restarting characteristics, but no separate light emission occurred and blackening was not recognized. It was determined that.

[Example 5]

Table 7

Lamp length: 2000 mm Lamp inner diameter: 125 mm Lamp current: 13.5 A Lamp voltage: 2660 V

Tallium iodide: 0.032 mg / cc, mercury: 1.68 mg / cc Encapsulated gas: argon

In the fifth embodiment, argon gas of 2.5 torr (about 333 kPa), 5 torr (about 667 kPa) and 10 torr (about) for a metal halide lamp having a lamp length of 2000 mm and a lamp inner diameter of 25 mm as shown in the above table 1333 kPa), 30 torr (about 4000 kPa), 40 torr (about 5328 kPa), 75 torr (about 10000 kPa), 85 torr (about 11332 kPa), 90 torr (about 11988 kPa) A luminescence test was done.

As a result, in the case of the metal halide lamp whose PxD (mm * torr) is 62.5, blackening was remarkable and it was determined that reliability was low. In the case of a metal halide lamp having a P x D (mm x torr) of 2250, blackening was not recognized, but separate light emission occurred, and the operating characteristics of the start-up and restart were also significantly deteriorated. It was determined.

On the other hand, in the case of each metal halide lamp having a P x D (mm x torr) of 125 to 1875, it can be confirmed that there is no separate light emission, the operation characteristics of start-up and restart are good, and the lamp characteristics exhibit good lamp characteristics without blackening. there was. In addition, in the case of a metal halide lamp having a P x D (mm x torr) of 2125, slight deterioration was observed in the starting and restarting characteristics, but no separate light emission occurred and blackening was not recognized. It was determined that.

(2nd embodiment)

Next, a second embodiment of the present invention will be described. In this embodiment, there is provided a discharge lamp lighting device capable of stably lighting a metal halide lamp having a light emission length of 800 mm or more without causing arc vibration.

As described in the above-described first embodiment, a metal halide in which a rare gas, mercury, iron, and thallium iodide are enclosed as a discharge medium in an airtight light emitting tube, and discharge electrodes are provided at both ends in the tube axis direction of the light emitting tube. Since the lamp contains iron, ultraviolet light with high luminous intensity is generated in the vicinity of 350 nm to 400 nm. Therefore, the lamp is useful as a light source for curing UV cured paints or photoreaction to functional polymer films having high market applications. will be.

However, such a metal halide lamp has a problem of easily separating arcs of mercury and thallium iodide during lighting, and also causing arc vibration depending on the lamp length.

This arc vibration is a phenomenon in which the arc under discharge does not go straight but is bent in the lamp axis direction. When this arc vibration occurs, there is a problem that the lamp voltage is fluctuated and the light emitting tube is expanded due to an increase in the light tube temperature.

The acoustic resonance is known as an arc vibration generating factor. The ramp periodically increases and decreases due to the frequency of the power supply voltage, and dense waves (mild when the input increases and decreases when the input increases) by plasma (mercury vapor) from the arc toward the lamp tube wall. At the same time, a reflected wave is generated which is reflected and returned from the tube wall with respect to the traveling wave to the lamp tube wall. When these two waves interfere, standing waves in which the pressure distribution does not change in time are generated. When such standing waves occur, an uneven pressure in the lamp tube destabilizes the arc state and generates arc vibration (bending).

In the present embodiment, a metal halide lamp having a light emission length of 800 mm or more in which a rare gas, mercury, and thallium iodide are enclosed as a discharge medium in an airtight light emitting tube, and discharge electrodes are provided at both ends in the tube axis direction of the light emitting tube. By supplying a square wave voltage and a current to the discharge electrode of this lamp by an electronic ballast, fluctuations in the input voltage and current on the time axis can be made uniform, and light emission of the lamp can be stably maintained.

Hereinafter, the discharge lamp of this embodiment is demonstrated in detail using FIG.2 (a)-FIG.2 (g). The ultraviolet (UV) discharge lamp 52 is a metal halide lamp, and is made of a refractory metal such as tungsten, molybdenum, tantalum, or stainless steel, titanium, etc. Metal electrodes 521 and 522 are disposed, and sockets 523 and 524 are provided outside, respectively. An example of the specification of the metal halide lamp 52 is shown: appearance diameter 27.5 mm, thickness 1.5 mm, emission length 1000 mm, lamp voltage 1100 V, lamp current value 11.0 A. In the present invention, the light emission length L of the light emitting tube 520 can be adopted that L ≥ 800 mm.

Inside the light emitting tube 520, a rare gas having an argon (Ar) gas pressure of 10 Torr (about 13, 3322 kPa), mercury 1.68 mg / cc or less, and thallium iodide (TlI) 0.01 mg / cc or less are encapsulated. Tallium iodide has a large emission peak near wavelength 352 nm, 365 nm, and 378 nm, particularly near wavelength 352 nm and 378 nm.

Thallium (Tl) has a strong bright spectrum in the wavelength region of 352 nm, 365 nm, and 378 nm, has the effect of reducing the luminescence intensity of mercury, thereby suppressing the mercury emission of 313 nm, which is 340 to 400 nm Ultraviolet light can be made to emit light with a relatively high emission in the wavelength region. Therefore, when the metal halide lamp 52 of this embodiment is used for the process of irradiating an ultraviolet-ray, superposing | polymerizing an ultraviolet-ray reactive material, and forming an oriented film on a glass plate in liquid crystal panel manufacture, it will greatly affect the characteristic of a liquid crystal panel. Irradiation of the ultraviolet-ray which is a wavelength range 340 nm or less can be reduced.

The lighting circuit 54 in the discharge lamp lighting device of the present embodiment uses both the AC power source 541 and the voltage and current of the AC power source 541 as stable square waves, so that both end electrodes of the metal halide lamp 52 ( It consists of the electronic ballast 542 applied to 521,522. That is, the sockets 523 and 524 at both ends of the metal halide lamp 52 are mounted in the power supply side sockets 531 and 532, respectively, and the power supply side sockets 531 and 532 are fed from the electronic ballast 542. Thus, the metal halide lamp 52 is discharged to light up.

The detailed structure of the electronic ballast 542 is shown in FIG. The electronic ballast 542 includes a power input terminal 61 for an AC power source 541, an input filter 62 for suppressing surge voltage, a full wave rectifier 63 for rectifying AC, and a low frequency filter 64 for rectified current. And a DC / DC converter 65 for DC-DC conversion to a DC of a predetermined voltage, a polarity switching device 66 for switching polarity, an output filter 67 for an output current, and an igniter 68, and a lamp The output terminals HV1 and HV2 for connection are connected to the igniter 68. In addition, a cooling fan 69 is provided.

On the other hand, in order to electronically control the electronic ballast 542, an analog control circuit 72 for controlling the control power source 71, the DC / DC converter 65, the polarity switch 66, the cooling fan 69, The microcomputer control circuit 73 and the operation panel circuit 74 are provided. In addition, the microcomputer control circuit 73 is connected to the input / output signal connector 75.

In the discharge lamp lighting device of the present embodiment, the electronic ballast 542 converts the alternating current of the AC power source 541 into a square wave voltage and a square wave current of a predetermined frequency for discharging both ends of the metal halide lamp 52. The electric power is supplied to the electrodes 521 and 522 to make the discharge light.

According to the discharge lamp lighting device of the present embodiment, as described above, the electronic ballast 542 feeds a square wave voltage and a current to the metal halide lamp 52 having a light emission length of 800 mm or more, thereby providing an input voltage and a current on the time axis. Can be made uniform, and light emission of the metal halide lamp 52 can be stably maintained.

[First Embodiment]

A rare gas having an argon (Ar) gas pressure of 10 Torr (about 13.3322 kPa), mercury 1.68 mg / cc, and thallium iodide (TlI) 0.012 mg in an interior of a light emitting tube having an outer diameter (ø) of 27.5 mm, a thickness of 1.5 mm, and an emission length of 800 mm. The metal halide lamp enclosed with / cc was lighted by applying a square wave voltage and a current having a frequency of 100 Hz with an electronic ballast, but stable lighting without arc vibration was maintained. Fig. 5A shows the no-load ramp voltage waveform at startup, and Fig. 5B shows the lamp current waveform immediately after lighting. In addition, although FIG. 5 shows the lamp current waveform during lighting, it can be seen that stable lamp current is obtained during lighting.

[First Comparative Example]

In the same manner as in the first embodiment, Hg, Fe, Sn and HgI ₂ were enclosed in a light emitting tube having an outer diameter of 27.5 mm, a thickness of 1.5 mm, and a light emitting length of 800 mm, and a metal gas having an Ar gas pressure of 10 Torr (about 13.3322 kPa). A light was applied to the ride lamp by applying a sine wave voltage and a current of 50 Hz to the choke coil ballast, but arc vibration occurred and stable lighting was not obtained.

Second Embodiment

A rare gas having an argon (Ar) gas pressure of 10 Torr (about 13.3322 kPa), mercury 1.68 mg / cc, and thallium iodide (TII) 0.032 mg in an inside of a light emitting tube having an outer diameter (ø) of 27.5 mm, a thickness of 1.6 mm, and a luminous length of 1300 mm. The metal halide lamp enclosed with / cc was lighted by applying a square wave voltage and a current having a frequency of 100 Hz with an electronic ballast, but stable lighting without arc vibration was maintained. Fig. 6 shows a lamp current waveform during lighting, which shows that a stable lamp current is obtained during lighting.

Second Comparative Example

The same metal halide lamp as in the second embodiment was applied by applying a sine wave voltage and a current having a frequency of 50 Hz to the choke coil ballast, but arc vibration occurred and stable lighting could not be obtained.

(Third embodiment)

Next, a third embodiment of the present invention will be described. This embodiment relates to the metal halide lamp used for the ultraviolet irradiation device which can irradiate light of the wavelength which is 300 nm-330 nm.

In the metal halide lamp in each of the embodiments described above, the wavelength of irradiated light is around 340 nm to 400 nm, so it cannot be irradiated at another wavelength. However, in the production of liquid crystal panels and the like, resins such as functional films that are cured by ultraviolet rays having a shorter wavelength range of 300 nm to 330 nm are also used, so that the light emitting light in this region can be efficiently and stably emitted. Metal halide lamps are also required.

In the metal halide lamp of the present embodiment, at least one of indium, manganese, bismuth cobalt, and zinc is 0.01 mg / cc or more in a metal halide lamp in which at least mercury and thallium iodide are encapsulated. It is enclosed.

EMBODIMENT OF THE INVENTION Below, this embodiment is described with reference to drawings.

8 shows a configuration diagram of a metal halide lamp according to the present embodiment. The metal halide lamp 10, the rare gas 11, the airtight container 12, the electrodes 13 and 14, and the lead wire 15 are shown.

A pair of electrodes 13 and 14 made of tungsten is used for the single-sealed airtight container 12 made of ultraviolet-permeable quartz, and as the rare gas 11 in the inner space of the airtight container 12, for example, For example, argon gas is enclosed.

In the metal halide lamp 10 having such a configuration, in the metal halide lamp in which at least mercury and thallium iodide are enclosed, the inner diameter D of the discharge tube is about D ≦ 30 mm and the input per unit length W / Cm) when the potential hardness (D) (V / cm) at 60 W / cm or more and stable lighting is lit at 9 <D <30, the amount of encapsulation (M) of indium, manganese and bismuth (Mg / cc) is characterized in that M? 0.01 mg / cc.

Specifically, the metal halide lamp 10 is, for example, an outer diameter of 27.5 mm, a thickness of 1.5 mm, and an emission length of 1000 mm, and the lamp voltage of the metal halide lamp 10 is 1275 V, and the lamp The current value is 13.5 A, and 0.02 mg / cc of indium, manganese, and bismuth are respectively enclosed. As a result, light emission having a wavelength of 300 nm to 330 nm can be realized, and a metal halide lamp which does not generate spectral or illuminance deviation (separated light emission) in the longitudinal axis direction of the metal halide lamp 10 can be realized. .

In addition, the substance enclosed in the inner space of the airtight container 12 of the metal halide lamp 10 is demonstrated with reference to FIGS. 9-16 about the wavelength at the time of light emission of each substance. 9 to 16, the vertical axis shows luminance as% and the horizontal axis shows the wavelength of light (nm).

First, in FIG. 9, when cobalt (Co) is enclosed in the internal space of the metal halide lamp 10, the wavelength distribution at the time of the light emission is shown. In the case of cobalt, the peak of a wavelength exists in the vicinity of about 300 nm-330 nm, and light emission in this wavelength can be confirmed.

Next, FIG. 10 shows the wavelength distribution at the time of light emission when indium (In) is enclosed in the internal space of the metal halide lamp 10. FIG. In the case of indium, like cobalt, a peak appears at a wavelength in the range of about 300 nm to 330 nm.

Next, in FIG. 11, when bismuth Bi is enclosed in the internal space of the metal halide lamp 10, the wavelength distribution at the time of the light emission is shown. Similarly to cobalt and iridium, bismuth has a peak at a wavelength in the range of about 300 nm to 330 nm.

Next, FIG. 12 shows the wavelength distribution at the time of light emission when the metal halide lamp 10 is sealed in the internal space. Zinc also has a peak at a wavelength in the range of about 300 nm to 330 nm.

FIG. 13 shows the wavelength distribution at the time of light emission when manganese is enclosed in the internal space of the metal halide lamp 10. Manganese has a peak in the wavelength range of about 270 nm to 330 nm.

Moreover, although the wavelength characteristics in the light emission of cobalt (Co), indium (In), bismuth (Bi), zinc (Zn), and manganese (Mn) were shown, in addition, titanium (Ti) and antimony were shown. In the case of (Sb) and silicon (Si) light emission, there is a possibility of having a peak at a wavelength of 300 nm to 330 nm.

Next, Fig. 14 to Fig. 15 show graphs comparing the conventional iron metal halide lamp and the metal halide lamp of the present invention with the wavelength distribution at the time of each light emission.

First, FIG. 14 shows wavelength distribution characteristics during light emission by a conventional metal halide lamp encapsulated with iron (Fe), and wavelengths of cobalt (Co) and indium (In) shown in FIGS. 9 and 10, respectively. The distribution characteristics are superimposed. In the figure, the thick solid line represents iron (Fe), the middle wide solid line represents cobalt (Co), and the thin solid line represents indium (In).

In Fig. 14, the peak of the wavelength due to iron exists in the range of about 360 nm to 370 nm. On the other hand, it can be seen that both cobalt and indium emit light at a wavelength in the range of 300 nm to 330 nm. Similarly, in Fig. 15, both bismuth and zinc show peaks at the wavelength of light emission in the range of 300 nm to 330 nm compared with iron. In Fig. 16, the peak of the emission wavelength is shown within the range of manganese from 300 nm to 330 nm compared with iron.

As described above, when the metal halide lamp of the present invention is selected from any one of indium, manganese, bismuth, zinc, and cobalt in combination, the amount of each substance in each case is 0.01 mg / cc. By the above, separate luminescence which is easy to generate | occur | produce in a longitudinal direction can be suppressed, and light emission of 300-330 nm can be efficiently emitted.

And preferably, it is based on the ratio with the amount of mercury, but the total amount of these substances is preferably 0.1 mg / cc or less. In addition, when 0.3 mg / cc or more of indium, manganese, and bismuth are respectively encapsulated in the metal halide lamp, luminescence separation occurs due to a decrease in the diffusion efficiency of mercury, indium, manganese, and bismuth. As a result, it is not possible to satisfy the lamp performance by causing luminescence separation in the longitudinal direction, but by encapsulating the amount of inclusion of 0.1 mg / cc or less as a total, the luminescence properties of the metal halide lamp are stabilized, and the wavelength is 300 nm to 330 nm. Luminescence can be obtained. Therefore, it can apply to lamp irradiation in the manufacturing process of the functional film which was not applicable at the conventional wavelength, for example.

According to the 3rd Embodiment of this invention demonstrated above, the metal halide lamp which can irradiate the light of the wavelength which is 300 nm-330 nm can be provided.

1 is a front view of a metal halide lamp according to a first embodiment of the present invention.

2 (a) to 2 (g) are graphs showing the spectral distribution in the metal halide lamp according to the first embodiment of the present invention.

Fig. 3 is a block diagram showing the overall configuration of a discharge lamp and a lighting device according to the second embodiment of the present invention.

4 is a block diagram showing the configuration of the electronic ballast shown in FIG.

Fig. 5A is a diagram of a no-load lamp voltage waveform at start-up in the discharge lamp according to the second embodiment, and Fig. 5B is a lamp current waveform diagram immediately after lighting.

Fig. 6 is a diagram of waveforms of lamp currents being turned on according to the second embodiment of the present invention.

Fig. 7 is a diagram of waveforms of lamp currents being turned on according to the second embodiment of the present invention.

8 is a configuration diagram of a metal halide lamp according to a third embodiment of the present invention.

Fig. 9 is a graph for explaining light emission wavelength distribution of cobalt in a metal halide lamp according to a third embodiment of the present invention.

Fig. 10 is a graph for explaining the light emission wavelength distribution of indium in the metal halide lamp according to the third embodiment of the present invention.

Fig. 11 is a graph for explaining a light emission wavelength distribution of bismuth in a metal halide lamp according to a third embodiment of the present invention.

Fig. 12 is a graph for explaining light emission wavelength distribution of zinc in the metal halide lamp according to the third embodiment of the present invention.

Fig. 13 is a graph for explaining light emission wavelength distribution of manganese in the metal halide lamp according to the third embodiment of the present invention.

14 is a graph for comparing light emission wavelength distributions of iron, cobalt and indium in a metal halide lamp according to a third embodiment of the present invention.

Fig. 15 is a graph for comparing light emission wavelength distributions of iron, bismuth and manganese in the metal halide lamp according to the third embodiment of the present invention.

Fig. 16 is a graph for comparing light emission wavelength distributions of iron and manganese in the metal halide lamp according to the third embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1, 10, 52: metal halide lamp

2, 520: light emitting tube

3, 4, 521, 522: electrode

5, 6, 523, 524: socket

11: rare gas

12: airtight container

13, 14: electrode

15: lead wire

54: lighting circuit

541 AC power

542: Electronic Ballast

Claims (6)

In a metal halide lamp having a light emission length of 800 mm or more, a rare gas, mercury, and thallium iodide are enclosed as a discharge medium in an airtight light emitting tube, and discharge electrodes are provided at both ends in the tube axis direction of the light emitting tube. The amount of the mercury (Mh) (mg / cc) and the amount of the thallium iodide (Mt) (mg / cc) are respectively in the following ranges. 0.3 mg / cc <Mh <5.0 mg / cc 0.006 mg / cc <Mt <0.048 mg / cc Metal halide lamp, characterized in that selected within. The method of claim 1, wherein when the inner diameter of the light emitting tube is D mm and the encapsulating gas pressure is Ptorr, the values of P and D are represented by the following equation. 75 <P × D <2125 Metal halide lamp, characterized in that selected to satisfy. The metal halide lamp of claim 1, wherein the rare gas is argon or xenon gas. 3. The metal halide lamp of claim 2, wherein the rare gas is argon or xenon gas. The metal halide lamp according to claim 1, wherein at least one of indium, manganese, bismuth cobalt, and zinc is sealed in an amount of 0.01 mg / cc or more. A metal halide lamp having a light emission length of 800 mm or more and the metal halide, in which a rare gas, mercury, and thallium iodide are enclosed as a discharge medium in an airtight light emitting tube, and discharge electrodes are provided at both ends in the tube axis direction of the light emitting tube; A discharge lamp lighting device comprising: an electronic ballast for supplying a square wave voltage and a current to the discharge electrode of the lamp.

Images