JP2000208102A - Rare gas discharge lamp and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce discharge starting voltage/lamp voltage and increase filling gas pressure and quantity of light and improve earthquake-proof against vibration. SOLUTION: An external electrode 3 is arranged on an outer surface of a glass tube bulb 2. An internal electrode 4 is applied on an inner surface of the bulb 2. Discharge starting voltage/lamp voltage are reduced and filling gas pressure is increased by reducing loss due to a dielectric (the bulb 2) by dielectric barrier discharge between the electrodes 3, 4. This causes increase in quantity of light and improvement of earthquake-proof against vibration. The quantity of light further increases by arranging either the electrode 3 or the electrode 4 opposite an aperture part (an opening part). Discharge area is spread by arranging the electrode 3 or the electrode 4 at the both sides of the aperture (the opening part), thereby a phosphor layer is effectively converted into visible light by ultraviolet rays by excimer molecule and effective light emitting area can be expanded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Hg-free excimer molecule which forms excimer molecules by dielectric barrier discharge, converts ultraviolet light emitted from the excimer molecules into visible light by a phosphor layer, and emits light to the outside. It relates to rare gas discharge lamps,
It can be used for manuscript illumination used in information equipment such as facsimile, copier, image reader, etc., and also as a backlight device for liquid crystal display. It relates to a discharge lamp.

[0002]

2. Description of the Related Art As a technique related to the present invention, for example, a discharge vessel is filled with a discharge gas for forming excimer molecules, and excimer molecules are formed by a dielectric barrier discharge (also known as an ozonizer discharge or a silent discharge). A discharge vessel for extracting light emitted from the excimer molecule is described, i.e., a dielectric barrier discharge lamp, wherein the discharge vessel is cylindrical and at least a portion of the discharge vessel is a dielectric of the dielectric barrier discharge. At least a part of the dielectric is light-transmissive to light emitted from the excimer molecule, and at least a part of the light-transmissive dielectric is a conductive mesh electrode or a conductive strip. A dielectric barrier discharge lamp structure provided with electrodes is known. Also, there is known a rare gas discharge lamp having an aperture (opening) provided in parallel with a discharge path of the dielectric barrier discharge, that is, a rare gas discharge lamp for extracting light in a direction perpendicular to the discharge path. Have been.

[0003] The rare gas discharge lamps described above are useful because they have various features not found in conventional low-pressure mercury discharge lamps and high-pressure arc discharge lamps. Further, since the aperture is provided in parallel with the discharge path, the radiance can be increased by increasing the dimension of the rare gas discharge lamp in the direction perpendicular to the aperture. Is also increased.

Specifically, in a rare gas discharge lamp used as a light source of OA equipment, a backlight of a display device, etc., a discharge is maintained by a pair of external electrodes formed on an outer wall of a bulb. There are, for example, FIG. 14, FIG.
It is configured as shown in FIG. That is, 71 is a rare gas discharge lamp. 72 is, for example, lead glass, soda glass,
A glass bulb made of quartz glass or the like, and a light emitting layer 73 made of a phosphor layer such as a rare earth phosphor layer and a halophosphate phosphor layer is formed on the inner surface of the bulb. The light emitting layer 73 has an aperture (opening) 72A on which the phosphor layer is not attached.
The light emitting layer 73 can be formed on the entire inner peripheral surface of the light emitting element 2.
The ends E and F of the glass bulb 72 are sealed with sealing members 74 and 75 made of a glass material having a lower melting point than the glass bulb 72, for example.

The interior space of the glass bulb 72 contains, for example, xenon (X) which does not contain metal vapor such as mercury.
e), a predetermined amount of rare gas such as krypton (Kr), neon (Ne), helium (He) or the like is enclosed alone or in a mixed state.
It is desirable to seal at a pressure of 0 to 110 Torr.
On the other hand, on the outer peripheral surface of the glass bulb 72, a pair of band-shaped external electrodes 76, 7 made of an opaque metal member such as aluminum, copper, silver, and nickel and having a small thickness are provided.
7 are arranged to face each other with the opening 72A interposed therebetween. Specifically, the external electrodes 76 and 77 are formed in a belt shape along the axial direction of the glass bulb 72 using a metal tape such as an aluminum tape or a copper tape, or a conductive paint such as a silver paste.

The rare gas discharge lamp 71 includes an external electrode 76,
High frequency high voltage at 77 (eg 2700V at 28KHz)
When xenon gas is discharged, ultraviolet light is emitted by excitation of the xenon gas, and this ultraviolet light is converted into visible light by the phosphor layer 73, and the light emitting portion 72A between the side edges of the external electrodes 76 and 77 is emitted. Released from In particular, since no mercury is used in the rare gas discharge lamp 71,
The light quantity rises sharply after lighting, and the light quantity reaches almost 100% at the same time as lighting. For this reason, it has recently been spotlighted as a light source for reading originals such as facsimile machines. In addition, it has been spotlighted as a light source for vehicles and a backlight for liquid crystal of notebook computers. However, in the dielectric barrier discharge between the external electrodes, the loss due to the dielectric (bulb) is large, the discharge starting voltage is high, the lamp voltage is naturally high, and the sealed gas pressure cannot be increased. Was impossible. Therefore, in recent years, as shown in FIGS. 16 and 17, dielectric barrier discharge between the outer electrode 93 and the inner central electrode 94 reduces the loss due to the dielectric (bulb), thereby reducing the firing voltage / lamp voltage. It has been found that it is possible to increase the filling gas pressure and to increase the amount of light. However, since the inner center electrode 94 has a structure in which the inner center electrode 94 is stretched around the center of the tubular glass bulb 91, there is a concern about vibration resistance such as vibration especially in a vehicle.

[0007]

SUMMARY OF THE INVENTION According to the present invention, an external electrode is provided on an outer surface of a glass tube bulb, an internal electrode is applied to an inner surface of the glass tube bulb, and a dielectric (bulb) is formed by dielectric barrier discharge between the electrodes. ),
It is an object of the present invention to provide a rare gas discharge lamp that not only increases the amount of light by reducing the discharge start voltage / lamp voltage and increases the sealed gas pressure, but also has high resistance to vibration and other earthquakes. Further, by arranging either the external electrode or the internal electrode to face the aperture (opening), it is possible to further increase the light amount.

Further, the inner electrode is coated with a conductive material and formed on the inner surface of the glass bulb to provide a structure having excellent earthquake resistance. In addition, the rare gas can be sealed by pressing the conductive line from the internal electrode with a sealing stem or a sealing bead or guiding the conductive wire from the inside to the outside through the sealing stem or the sealing bead. The discharge lamp is sealed. Also, the sealing operation can be simplified by stretching the applied internal electrode and press-fitting it with a sealing stem or a sealing bead.

[0009]

In a rare gas discharge lamp in which a rare gas is sealed in a sealed tubular glass bulb and a dielectric barrier discharge is performed using the tubular glass bulb as a dielectric, an outer surface side of the tubular glass bulb is provided. There is an external electrode, an internal electrode provided on the inner surface side facing the external electrode, a phosphor layer is formed on the internal electrode and on the inner surface side of the tubular glass bulb, the tubular glass bulb In the rare gas discharge lamp, the light extraction opening is provided in parallel with the tubular glass bulb axis, and the external electrode or the internal electrode is arranged to face the opening to further increase the light amount. Let me. Further, a light reflection layer is formed on the phosphor layer to increase the amount of light. Further, the invention is characterized in that the external electrode and the internal electrode are strip electrodes. By forming the strip-shaped electrode in a grid-like electrode shape, stable discharge is possible. In addition, since the internal electrode is easily formed by coating on the inner surface side of the tubular glass bulb, the loss due to the tubular glass bulb is reduced, thereby reducing the discharge start voltage / lamp voltage and increasing the filling gas pressure, We provide rare gas discharge lamps that not only increase the amount of light but also have high resistance to vibration and other earthquakes.
The rare gas is at least one of Xe, Kr, Ne, He, and Ar, or a mixture of a plurality of the gases, and the phosphor is excited by ultraviolet light to emit visible light, and the rare gas is sealed with Xe. By setting the pressure to 50 to 250 torr, the light amount can be further increased.

In a method for manufacturing a rare gas discharge lamp,
Forming an external electrode on the outer surface side of the tubular glass bulb, applying an internal electrode substantially opposed to the external electrode to the tubular glass bulb, and providing a reflective layer on the inner surface of the tubular glass bulb; Forming a phosphor layer on a reflective layer, fixing one end of the tubular glass bulb with a sealing stem or a sealing bead, and disposing an internal electrode outside the tubular glass bulb. Alternatively, a step of connecting and sealing with a conductive wire from the outside with the sealing bead, and sealing a rare gas from an unsealed end with a sealing stem or a sealing bead. There is provided a method for manufacturing a rare gas discharge lamp, comprising a step of sealing. In addition, the conductive wire is sealed by pressing with the sealing stem or the sealing bead, or is sealed through the inside of the sealing stem or the sealing bead. The method further comprises a step of extending the internal electrode applied and formed on the inner surface of the tubular glass bulb in place of the conductive wire, welding the internal electrode with the sealing stem or the sealing bead, and extracting the same to the outside. The present invention provides a method for manufacturing a rare gas discharge lamp.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a rare gas discharge lamp and a power supply of the present invention, and FIG. 2 is a main part AA of the rare gas discharge lamp of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of a cross section, 1 shows a rare gas discharge lamp. 2
Is a valve closed by stems 7 and 8 at both ends. On the inner surface and the outer surface of the bulb 2, the phosphor layer on the inner surface of the bulb located between the pair of opposing internal electrodes 4 and external electrodes 3 and edges 9 and 10 facing each other is removed, and an aperture (opening) is formed. ) 2A. A phosphor layer 5 is applied to the inner surface, the outer electrode 3 is a band-shaped electrode provided along the valve axis direction of the bulb 2, and the inner electrode 4 is a conductive material such as silver on the inner surface of the bulb 2. Band-shaped electrodes provided in a pair along the axial direction of the valve provided by coating a conductive material. Also, as other conductive materials, gold,
Nickel, copper, and aluminum are used. Furthermore, external electrodes 3
Is made of aluminum tape. Other materials include a metal tape such as a copper tape and a conductive paint such as a silver paste. Noble gas is
Any of Xe, Kr, Ne, He, and Ar alone or a plurality of mixed gases may be used as long as the phosphor emits visible light when excited by ultraviolet light.
e is sealed at 50 to 250 torr.

An inner reflective layer 6 is provided below the phosphor layer 5 to further increase the amount of light. Further aperture
The light quantity of the char (opening) 2A is increased even in a structure in which only the phosphor layer is provided without providing the reflection layer. The external conduction line 11 is provided on the internal electrode 4 through the stem 7. A bead may be used instead of the stem 7. A dumet wire is used as the external conduction line 11. It is preferable to use the same member as the conductive material for the connection member of the external conduction line 11 of the internal electrode 4. Further, the connecting portion is reinforced with the glass powder 12 for sealing. By doing so, it is possible to provide a rare gas discharge lamp excellent in earthquake resistance for use in vehicles.

Next, a second embodiment will be described with reference to the drawings. FIG. 3 is an explanatory view of a rare gas discharge lamp and a power supply according to the present invention, and FIG. 4 is an explanatory view of a cross section taken along line BB of the rare gas discharge lamp of the present invention. Show. FIG.
Fig. 2 shows a sectional view of the main part. 32 is a valve closed by stems at both ends. On the inner surface and the outer surface of the bulb 32, a pair of substantially opposed internal electrodes 34 and external electrodes 33,
The phosphor layer 35 on the inner surface of the bulb located between the opposing edges 39, 310 is removed and the aperture is removed.
(Opening) 32A is formed and an aperture (Opening)
The internal electrode 34 is arranged at a position facing 32A. A phosphor layer 312 is applied on the inner surface, and the external electrode 33
Is a band-shaped electrode provided along the valve axis direction of the valve 32, and the internal electrode 34 is a band-shaped electrode provided along the valve axis direction provided by applying a conductive material such as silver to the inner surface of the valve 32. Electrodes. In addition, gold, nickel, copper, and aluminum are used as other conductive materials. Further, the external electrode 33 is formed of an aluminum tape.
Other materials include metal tape such as copper tape,
It is formed of a conductive paint such as silver paste.

Below the phosphor layer 312, an inner reflective layer 35 is provided.
Is provided to further increase the amount of light. The external conductive line 311 is provided to the internal electrode 34 through the stem 37. As the external conduction line 311, a Dumet wire is used. Then, the external conductive line 3 of the internal electrode 34
It is preferable to use the same member as the conductive material 13 for the connection member 11. Further, the connection part is reinforced with a sealing powder glass 313. By doing so, a rare gas discharge lamp excellent in earthquake resistance is provided for use in vehicles.

In a third embodiment of the present invention, the positions of the internal electrode 34 and the external electrode 33 in the second embodiment are reversed. FIG. 5 shows a cross-sectional view of the main part. The description is omitted here because it is substantially the same as the second embodiment.

Further, as the fourth and fifth embodiments of the present invention, as shown in the sectional views of the main parts in FIGS. 6 and 7, the external electrodes 33 or the internal electrodes 34 of the third and fourth embodiments are shown.
Are provided at both ends of the aperture 32A (opening), thereby expanding the discharge region, and expanding the effective light emitting region where the phosphor layer is effectively converted into visible light by the ultraviolet rays of the excimer molecules.

Next, as shown in a sectional view of a main part of FIG. 8, an external electrode 33 is provided on the outer peripheral surface of the tubular valve 32 by an aperture.
The embodiment of the present invention also has a structure in which the internal electrode 34 is arranged at a position substantially opposite to the aperture portion (opening) except for the portion (opening). At this time, laminating the reflective layer and the phosphor layer except for the aperture part (opening part)
This is the same as the above embodiment. As described above, by adopting a shape in which an electrode is applied and provided inside, a rare gas discharge lamp excellent in earthquake resistance for use in a vehicle is provided.

FIGS. 9, 10, 11, 12 and 13 show the details (main parts) of the method for manufacturing a rare gas discharge lamp according to the present invention. 9 and 10 show first and second embodiments showing a method for sealing a rare gas discharge lamp according to the present invention. Here, the description of the reflection layer provided on the inner surface of the bulb is omitted, but it goes without saying that the reflection layer is interposed. Examples of the reflection layer include titanium oxide and barium sulfate. An external electrode 85 is formed of a metal tape such as an aluminum tape on the outer peripheral surface of the bulb, and an internal electrode 83 made of a conductive material is applied and formed. Next, an electrical connection is made with the external conductive line 82 using the same conductive material, and the connection location is fixed with a sealing powder glass 86. Subsequently, an external conducting wire 82 is led out from a through hole of the sealing stem 87 or the sealing bead 88 to seal the sealing stem 87 or the sealing bead 88. Next, Xe is sealed at 50 to 250 torr from one open end, and the other is also sealed.

FIG. 11 shows a third embodiment of the method for sealing a rare gas discharge lamp according to the present invention. Although the basic parts are the same as above, they are omitted, but the main parts will be described. An external electrode 85 is formed of a metal tape such as an aluminum tape on the outer peripheral surface of the bulb, and an internal electrode 83 made of a conductive material is applied and formed. Next, an electrical connection is made with the external conductive line 82 using the same conductive material,
The connecting portion is fixed with a sealing powder glass 86. Next, the inner surface of the tubular glass bulb and the external conducting wire 82 are press-sealed with the sealing stem 87. Here, the sealing stem 8
7, the sealing bead may be used.

FIGS. 12 and 13 show fourth and fifth embodiments of the method for sealing a rare gas discharge lamp according to the present invention. Since the basic parts are the same as those in the above embodiment, the description will be omitted. FIG.
In both FIGS. 13 and 13, a conductive material is applied as the internal electrode 83 and extended to the outside. A fixing portion is provided on the glass bulb, and the sealing stem 87 or the sealing bead 88 is fixed, welded and sealed. Since the internal electrodes are applied to the glass bulb surface in advance and are drawn out to the outside, the internal electrodes can be drawn out to the outside without using an external conducting wire, so that the process is simplified and cost reduction is expected.

As described above, according to the present invention, an external electrode is provided on the outer surface of a glass tube bulb, an internal electrode is applied to the inner surface of the glass tube bulb, and a dielectric (bulb) is formed by dielectric barrier discharge between the electrodes. ),
By reducing the discharge starting voltage / lamp voltage and increasing the sealed gas pressure, it is possible to provide a rare gas discharge lamp which not only increases the amount of light but also has strong seismic resistance such as vibration. Further, by arranging either the external electrode or the internal electrode to face the aperture (opening), it is possible to further increase the light quantity. Further, the external electrode 33 or the internal electrode 34 is provided with an aperture, respectively.
By providing the discharge region at both ends of 32A (opening), the discharge region is expanded, and the phosphor layer is effectively converted into visible light by the ultraviolet rays of the excimer molecules, so that the effective light emission region can be expanded.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a rare gas discharge lamp according to the present invention.

FIG. 2 is an enlarged view of a main part of a cross-sectional view taken along the line AA of FIG. 1;

FIG. 3 is a view showing a second embodiment of the rare gas discharge lamp according to the present invention.

FIG. 4 is an enlarged view of an essential part of a sectional view taken along line BB of FIG. 2;

FIG. 5 is a sectional view showing a main part of a third embodiment of the rare gas discharge lamp according to the present invention.

FIG. 6 is a sectional view showing a main part of a fourth embodiment of the rare gas discharge lamp according to the present invention.

FIG. 7 is a sectional view showing a main part of a fifth embodiment of the rare gas discharge lamp according to the present invention.

FIG. 8 is a sectional view showing a main part of a sixth embodiment of the rare gas discharge lamp according to the present invention.

FIG. 9 shows a first embodiment of a main part of a method for manufacturing a rare gas discharge lamp according to the present invention.

FIG. 10 shows a second embodiment of the main part of the method for manufacturing a rare gas discharge lamp according to the present invention.

FIG. 11 shows a third embodiment of the main part of the method for manufacturing a rare gas discharge lamp according to the present invention.

FIG. 12 shows a fourth embodiment of the main part of the method for manufacturing a rare gas discharge lamp according to the present invention.

FIG. 13 shows a fifth embodiment of the main part of the method for manufacturing a rare gas discharge lamp according to the present invention.

FIG. 14 is a view showing an example of a conventional rare gas discharge lamp.

FIG. 15 is a view showing a cross-sectional view taken along the line CC of FIG. 13;

FIG. 16 is a view showing an example of a conventional rare gas discharge lamp.

FIG. 17 is a diagram showing a DD cross-sectional view of FIG. 15;

[Explanation of symbols]

1, 31, 71, 91 ... rare gas discharge lamp 2, 32, 72, 92 ... tubular glass bulb 2A, 32A, 72A, 92A ... aperture (opening) 3, 33, 76 , 77, 85, 93 ... external electrode 4, 34, 83 ... internal electrode 5, 312, 73, 84, 95 ... phosphor layer 6, 35, 96 ... reflective layer 7, 8, 37, 38, 97, 98 ... Stem for sealing 9, 10, 39, 310 ... Edge 11, 311, 82 ... External conducting wire 12, 86, 313 ... Powder glass for sealing E, F: End 74, 75: Sealing member 88: Bead for sealing 94: Inner center electrode

Claims (15)

[Claims] 1. A rare gas discharge lamp for performing a dielectric barrier discharge using a tubular glass bulb as a dielectric, wherein a rare gas is sealed inside the sealed tubular glass bulb, and an external electrode is provided on an outer surface side of the tubular glass bulb. There is an internal electrode provided on the inner surface side substantially opposite to the external electrode, a phosphor layer is formed on the inner surface side of the tubular glass bulb, and the tubular glass bulb is provided with the phosphor layer. A rare gas discharge lamp characterized in that an opening for light extraction is provided parallel to the axis of the tubular glass bulb. 2. The rare gas discharge lamp according to claim 1, wherein the external electrode or the internal electrode is disposed to substantially face the opening. 3. The external electrode or internal electrode according to claim 2, wherein an electrode which is not disposed substantially opposite to the opening is provided near and parallel to the opening. Noble gas discharge lamp. 4. The rare gas discharge lamp according to claim 1, wherein a light reflecting layer is formed below said phosphor layer. 5. The rare gas discharge lamp according to claim 4, wherein a phosphor layer is formed in the opening as well as the inner surface of the tubular glass. 6. The rare gas discharge lamp according to claim 1, wherein the external electrode and the internal electrode are strip electrodes. 7. The apparatus according to claim 1, wherein at least one of said external electrode and said internal electrode is a grid-like electrode.
6. The rare gas discharge lamp according to 6. 8. The rare gas discharge lamp according to claim 1, wherein the internal electrode is formed by coating on the inner surface of the tubular glass bulb. 9. The rare gas discharge lamp according to claim 1, wherein a plurality of said internal electrodes or external electrodes are provided with an opening therebetween. 10. The rare gas is Xe, Kr, Ne, H
The rare gas discharge lamp according to any one of claims 1 to 9, wherein the phosphor emits visible light by being excited by ultraviolet light only with at least one of e and Ar or a plurality of mixed gases. 11. The rare gas is Xe, and the sealed pressure is 5
0 to 250 torr.
9. The rare gas discharge lamp according to 9. 12. A method of manufacturing a rare gas discharge lamp in which a rare gas is sealed in a sealed tubular glass bulb and a dielectric barrier discharge is performed using the tubular glass bulb as a dielectric, the method comprising the steps of: Forming an external electrode, applying an internal electrode substantially opposite to the external electrode to the tubular glass bulb, providing a reflective layer on the inner surface of the tubular glass bulb, and forming a fluorescent layer on the internal electrode and the reflective layer. Forming a body layer, fixing one end of the tubular glass bulb with a sealing stem or a sealing bead, and passing the internal electrode through the sealing stem or the sealing bead. And a step of sealing a conductive gas from the other end and a step of sealing a rare gas from the unsealed end and sealing with a sealing stem or a sealing bead. A method for manufacturing a rare gas discharge lamp. 13. The method for manufacturing a rare gas discharge lamp according to claim 12, wherein said conductive wire is welded and sealed by said sealing stem or said sealing bead. 14. A method for manufacturing a rare gas discharge lamp according to claim 12, wherein said conductive wire is sealed through said sealing stem or said sealing bead. 15. The method according to claim 15, further comprising a step of extending the internal electrode formed on the inner surface of the tubular glass bulb in place of the conductive wire, and pressing the internal electrode by the sealing stem or the sealing bead to draw it out. The method for manufacturing a rare gas discharge lamp according to claim 12, characterized in that: