JPH1140108A - Rare gas discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rare gas discharge lamp, capable of enhancing light- emitting efficiency of a light-emitting layer with a relatively simple constitution and of improving light emission. SOLUTION: This discharge lamp is provided with an envelope 1 having a light-emitting layer 2A on an inner face, a pair of band-shaped external electrodes 5 and 6 consisting of metal members disposed, so as to be spaced with each other on an outer circumference face of the envelope 1 over substantially a full length thereof so that first and second openings 7 and 8 are formed at a spaced part, and an insulation member 4 mounted to the outer circumference of the envelope 1, so that the external electrodes 5 and 6 are covered. In this case, the light-emitting layer 2A includes at least first and second phosphors, and the first and second phosphors comprise phosphors in which an energizing region of the second phosphor exists in a light-emitting region of the first phosphor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rare gas discharge lamp, and more particularly, to a rare gas discharge lamp in which a light emitting layer having an aperture is formed on the inner surface of a glass bulb and a pair of band-shaped external electrodes are arranged on the outer peripheral surface. In an electric lamp, the present invention relates to an improvement of a light emitting layer structure capable of increasing a light output.

[0002]

2. Description of the Related Art The present applicant has previously proposed a rare gas discharge lamp L shown in FIGS. In FIG. 1, reference numeral 1 denotes a straight tubular envelope which is hermetically sealed by a glass bulb, for example, and has a light emitting layer 2 made of a phosphor such as a rare earth phosphor or a halophosphate phosphor on the inner surface thereof. Is formed. In particular, the light emitting layer 2 is formed with an aperture 2a having a predetermined opening angle over substantially the entire length. The sealing structure of the envelope 1 is configured by sealing a disk-shaped sealing glass plate to an end of a glass bulb. It can also be configured. In the enclosed space of the envelope 1, a rare gas such as xenon (Xe), krypton (Kr), neon (Ne), and helium (He) which does not contain metal vapor such as mercury is used alone or mixed. A predetermined amount is enclosed.

[0003] A sheet structure 3 is wound around the outer peripheral surface of the envelope 1 so as to be in close contact therewith. This sheet structure 3
For example, an insulating translucent sheet 4 having a length substantially equal to the entire length of the envelope 1 and a thickness set in a range of 20 to 100 μm, and the translucent sheet 4 A pair of strip-shaped external electrodes 5 and 6 made of a non-translucent metal member which are adhered to one surface of the first electrode 4 at a predetermined distance from each other, and from the ends of the external electrodes 5 and 6, Terminals 51 and 61, which have an electrical connection relationship and are led out so that the leading ends protrude from an edge portion of the translucent sheet 4, and the translucent sheet 4
And an adhesive layer 9 having an adhesive or adhesive function provided to one surface of the substrate. In addition, when the sheet structure 3 is mounted on the envelope 1, one end 5 of the external electrodes 5, 6 is provided.
a and 6a, a first opening 7 is formed between the other ends 5b and 6b of the external electrodes 5 and 6, and a second opening 8 is formed between the other ends 5b and 6b. It is mainly emitted outside through the first opening 7 through the aperture 2a.
Further, in the sheet structure 3, as the translucent sheet 4,
For example, polyethylene terephthalate (PET) resin is suitable, but other resins such as polyester resin can also be used.

The above-mentioned sheet structure 3 is mounted on the outer peripheral surface of the envelope 1 so that the external electrodes 5 and 6 are located between the envelope 1 and the translucent sheet 4 (see FIG. 1). Winding). This sheet
The mounting of the structure 3 on the envelope 1 is performed, for example, as shown in FIG. First, the sheet structure 3 is arranged on the stage 10 in an expanded state. Next, the envelope 1 is arranged at one end 4a of the translucent sheet 4 in the sheet structure 3, and
The envelope 1 is formed by a pair of driven rollers 11
After the stage 10 is set so as to be pressed against the stage 4, the stage 10 is slightly moved in the M direction and then moved in the N direction. Then, the sheet structure 3 relatively rolls on the translucent sheet 4, and the outer peripheral surface of the sheet structure 3 is mounted by being wound. In the sheet structure 3, the external electrodes 5 and 6 are adhered to the outer peripheral surface of the envelope 1 by using an adhesive layer formed on the surface thereof, and the translucent sheet 4 is Using the adhesive layer 9 formed on one side, it is adhered to the outer peripheral surface of the envelope 1 at the time of winding, and the respective ends 4a and 4b are overlapped and adhered at the second opening 8. .

[0005] The rare gas discharge lamp DL is lit by, for example, a lighting device shown in FIG. This lighting device comprises an inverter circuit H for generating a high-frequency high voltage having a frequency of, for example, 30 KHz and a voltage of about 2500 V0 _-P, and an inverter circuit H.
The inverter circuit H includes a switching transistor Q for controlling the supply of DC power to the inverter circuit H, and a smoothing capacitor C. The inverter circuit H includes, for example, primary coils TRa and TRb, a secondary coil TRc, Excitation coil T
An oscillation transformer TR having Rd and a primary coil TRa,
A choke coil CH connected between the middle point of TRb and the switching transistor Q, and primary coils TRa and T
First and second transistors Qa, Qb connected to Rb
And resistors Ra and Rb connected between the bases of the first and second transistors Qa and Qb and the exciting coil TRd. External electrodes 5 and 6 of the rare gas discharge lamp DL are connected to the output side of the inverter circuit H.

In this lighting device, when a DC power source obtained by, for example, full-wave rectification of a commercial power source is connected between the terminals T1 and T2 and a drive signal is applied to the terminal T3 at appropriate intervals, the switching transistor Q is turned on, When the first and second transistors Qa and Qb are turned ON and OFF at appropriate times, the high-frequency high voltage described above is generated in the secondary coil TRc of the oscillation transformer TR, and the external electrodes 5 and 6 of the rare gas discharge lamp DL are generated. Is applied to Thereby, the rare gas discharge lamp D
L is different from a discharge lamp using a hot cathode or a cold cathode, which is lit by one discharge path along the longitudinal direction of the envelope, between the external electrodes 5 and 6 (the longitudinal direction of the envelope 1). (In a direction substantially perpendicular to the direction), the lighting is performed in a striped state by forming an infinite number of discharge paths. In this state, an excimer (approximately 172 nm) is generated in the inner space of the envelope 1 due to collision between rare gas atoms, and the light emitting layer 2 is excited by ultraviolet rays emitted by the excimer to emit light, and light is transmitted through the aperture.
The light is released from the first opening 7 to the outside through the tea portion 2a. In a normal lighting state, a striped discharge state cannot be visually observed.

Particularly, since no mercury is used in the rare gas discharge lamp DL, the light quantity rises sharply after lighting and has a characteristic that the light quantity reaches almost 100% simultaneously with lighting. ing. For this reason, it is suitable as a light source for reading originals of OA equipment such as a facsimile, an image scanner, and a copying machine.

[0008]

By the way, in this rare gas discharge lamp, the light emitting layer 2 may be formed by appropriately mixing two or more kinds of phosphors. However, the facsimile, the image scanner, and the copier When applied to a document irradiating device of OA equipment, the light emitting layer 2 is often formed of a single phosphor. For example, a single luminescence of cerium and terbium-activated lanthanum phosphate phosphor (LaPO ₄ : Ce, Tb) having an excitation spectrum and an emission spectrum characteristic as shown in FIG. 14 and exhibiting an emission peak at 544 nm. Layer 2 is constituted.

This lanthanum phosphate phosphor is most efficiently excited by ultraviolet light near 300 nm, and is emitted at 544 nm.
In this rare gas discharge lamp DL, an excimer of approximately 172 nm is generated, and the ultraviolet light emitted from the excimer excites the light emitting layer 2 to emit light. The excitation efficiency of the phosphor is reduced, and the amount of light is also reduced.

However, in this rare gas discharge lamp, since the aperture portion 2a is formed in the light emitting layer 2, the radiated light emitted from the light emitting layer 2 to the outside through the first opening 7 is to some extent. Since the density of the document can be increased, the illuminance of the document surface can be increased and the reading accuracy of the document can be improved. However, recently, there has been a demand for further improvement in the processing capability of OA equipment. To increase the illumination on the original surface,
This rare gas discharge lamp may be difficult to cope with.

Therefore, an object of the present invention is to increase the luminous efficiency of the light emitting layer with a relatively simple structure,
An object of the present invention is to provide a rare gas discharge lamp capable of improving light output.

[0012]

SUMMARY OF THE INVENTION Accordingly, in order to achieve the above-mentioned object, the present invention provides an envelope having a light emitting layer on the inner surface and an outer peripheral surface of the envelope over substantially the entire length thereof. A pair of band-shaped external electrodes made of a metal member arranged so as to be separated from each other and to form the first and second openings in the separated portion, wherein the light emitting layer has at least the first and second electrodes; It is characterized by including a phosphor, and wherein the first and second phosphors are phosphors in which an excitation region of the second phosphor exists in a light emitting region of the first phosphor.

According to a second aspect of the present invention, there is provided an envelope having a light-emitting layer on an inner surface thereof, and an outer peripheral surface of the envelope substantially separated from the outer surface over substantially the entire length thereof, and a first portion provided on a separated portion. A pair of band-shaped external electrodes made of a metal member arranged so as to form a second opening, and an insulating member mounted on the outer peripheral surface of the envelope so as to cover the external electrodes. The light emitting layer includes at least first and second phosphors;
The second phosphor is a phosphor in which the excitation region of the second phosphor exists in the emission region of the first phosphor.

A third invention of the present invention is characterized in that the light emitting layer is constituted by mixing at least first and second phosphors, and a fourth invention is characterized in that the light emitting layer comprises First
A second light emitting layer is formed by laminating the first light emitting layer, a second light emitting layer is formed by a second phosphor, and a first light emitting layer is formed by a second phosphor. Is disposed on the inner surface side of the envelope, and the second light emitting layer is disposed on the discharge space side.

Further, the fifth invention of the present invention is directed to the first invention.
Wherein the phosphor of the present invention is a lead-activated barium / zinc / magnesium silicate phosphor, and the second phosphor is a cerium / terbium-activated lanthanum phosphate phosphor.
The total amount of the light emitting layer is set in a range of 5 to 30 mg per 1 cm ^2. The seventh invention is characterized in that the ratio of the first phosphor in the light emitting layer is 0.5 to 10.0. % By weight.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the rare gas discharge lamp according to the present invention will be described with reference to FIGS. The same parts as those in the prior art shown in FIGS. 9 to 11 are denoted by the same reference numerals, and detailed description thereof will be omitted. In this figure, the characteristic part of this embodiment is that the light emitting layer 2A includes at least the first and second phosphors, and the first and second phosphors correspond to the second phosphor in the light emitting region of the first phosphor. That is, the excitation region of the phosphor is constituted by the existing phosphor.

More specifically, the light emitting layer 2A is composed of a mixture of at least a first and a second phosphor, and a lead-activated barium / zinc / magnesium phosphor ((BaZnMg) is used as the first phosphor. ) ₃ Si ₂ O ₇ : Pb)
Cerium and terbium-activated lanthanum phosphate phosphors (LaPO ₄ : Ce, Tb) are each applied as the phosphors. This first phosphor has the excitation spectrum and emission spectrum characteristics shown in FIG. In particular, the excitation spectrum has two maximum points at approximately 210 nm and 250 nm, and exhibits an emission peak at approximately 300 nm. On the other hand, the second phosphor has the excitation spectrum and emission spectrum characteristics shown in FIG. 14, and the emission region of the first phosphor overlaps the excitation region. Therefore, at the time of operation, the second phosphor is excited by the first emission spectrum at the same time as being excited by the ultraviolet rays accompanying the discharge, so that the excitation efficiency is improved and the amount of emitted light can be increased.

In particular, the ratio of the first phosphor occupying the light emitting layer 2A is in a practical range of 0.5 to 10.0% by weight, but is preferably in a range of 1.0 to 3.0% by weight. desirable. However, if the ratio is less than 0.5% by weight, the second phosphor cannot be sufficiently excited by the first emission spectrum, and an increase in the amount of light cannot be expected. On the other hand, when the ratio exceeds 10.0% by weight, the amount of light decreases. Therefore, it is desirable that the ratio of the first phosphor in the light emitting layer 2A be set within the above range.

Further, as described above, the light emitting layer 2A includes the first and second light emitting layers.
The second phosphor is mixed, and the attached amount is set in the range of 5 to 30 mg per 1 cm ² . Although the desired light output can be obtained in this range, if the amount of adhesion is less than 5 mg, the light output is reduced and the illuminance of the original surface becomes insufficient. Conversely, if the amount exceeds 30 mg, the uniform light emission is obtained. It becomes difficult to form the layer 2A. Therefore, it is desirable that the amount of the light emitting layer 2A attached be set within the above range. Note that, depending on the use of the rare gas discharge lamp, the second phosphor may be formed by mixing a plurality of phosphors. For example, in the case of a three-wavelength emission type, it is possible to mix phosphors having emission spectra in the blue, green, and red regions.

Further, first and second openings 7 and 8 are formed in the separated portions of the external electrodes 5 and 6, respectively.
The respective opening angles θ ₁ and θ ₂ are set in a relation of θ ₁ > θ ₂ . The opening angle θ ₁ of the first opening 7 is 60 to 12
In the range of 0 °, the opening angle θ ₂ of the second opening 8 is preferably about 55 °. However, the second opening 8
Is desirably small enough not to cause dielectric breakdown. For example, it is recommended to secure a separation distance of at least about 2 mm.
The opening angle of the aperture 2a is the first opening 7
Is set to be substantially the same as the opening angle θ _{1 of} .

According to this embodiment, the light emitting layer 2A has the first
The second phosphor is excited by the ultraviolet light emitted by the excimer and the second phosphor is excited by the emission spectrum of the first phosphor, so that the excitation efficiency of the second phosphor is improved, The amount of light emitted from the light emitting layer 2A to the outside can be increased. Therefore, when the rare gas discharge lamp is applied to a document irradiating device, the illuminance of the document surface can be further increased,
Reading accuracy can be improved.

In particular, the adhesion amount of the light emitting layer 2A is set in the range of 5 to 30 mg per 1 cm ^2, but the adhesion amount is set to about 2 to 10 times as compared with a normal fluorescent lamp for illumination. In spite of the amount that is considered to be unfavorable in terms of characteristics in ordinary fluorescent lamps for illumination, the light output is effectively increased in rare gas discharge lamps. Although the cause is not clear, the innumerable discharge paths are formed between the external electrodes 5 and 6 (in a direction substantially perpendicular to the longitudinal direction of the envelope 1A), so that the rare-earth lamps are lit in a striped state. This is considered to be a phenomenon peculiar to gas discharge lamps.

The amount of the light emitting layer to be deposited is 5 to 30 mg / cm.
² , the opening angle θ ₁ of the first opening 7 is 60 to 12
If the angle is set to 0 ° and the outer electrodes 5 and 6 are provided with light reflectivity on the envelope side, the light output emitted from the first opening 7 can be further increased. On this occasion,
If the separation length of the second opening 8 is set to a narrow opening angle of about 2 mm (corresponding to approximately 29 °), light leakage from the second opening 8 is suppressed, and the first opening 7 The effect of improving the light output emitted from is expected.

FIG. 3 shows a second embodiment of the present invention, and the basic configuration is the same as that of the rare gas discharge lamp shown in FIG. The difference is that the light emitting layer 2A is different from the first light emitting layer 2A.
a and the second light emitting layer 2Ab are laminated,
The first light-emitting layer 2Aa is formed of a first phosphor, the second light-emitting layer 2Ab is formed of a second phosphor, and the first light-emitting layer 2Aa is formed on the inner surface side of the envelope 1, Second light emitting layer 2A
b is arranged on the discharge space side. The first light emitting layer 2Aa may be formed of a second phosphor, and the second light emitting layer 2Ab may be formed of a first phosphor.

According to this embodiment, the first light emitting layer 2Aa
And the second light-emitting layer 2Ab are excited by the ultraviolet light emitted by the excimer and the second light-emitting layer 2Ab is excited by the emission spectrum from the first light-emitting layer 2Aa from the side not in contact with the discharge space. The second light emitting layer 2Ab
Is improved, and the amount of light emitted from the light emitting layer 2A to the outside can be increased. Therefore, when the rare gas discharge lamp is applied to a document irradiating device, the illuminance of the document surface can be increased, and the reading accuracy can be improved.

FIG. 4 shows a third embodiment of the present invention. The basic configuration is the same as that of the rare gas discharge lamp shown in FIG. The difference is that the opening angle θ ₃ of the aperture 2 a formed in the inner surface of the envelope 1 corresponding to the first opening 7 is set to be larger than the opening angle θ ₁ of the first opening 7. It was done. Ame - opening angle theta ₃ tea unit 2a is set in a range of, for example, 70 to 130 degrees, applications,
It can be changed appropriately according to the purpose and the like. The opening angle theta ₁ of the first opening 7 and the opening angle theta ₂ of the second opening 8 theta _1>
θ ₂ is set.

According to this embodiment, when the sheet structure 3 is wound around the outer peripheral surface of the envelope 1, the first opening 7 and the aperture
Even if the center with respect to the cha portion 2a is slightly shifted, the shift of the optical axis of the light emitted from the first opening 7 can be reduced. For this reason, even when applied to, for example, a document irradiation device, sufficiently high reading accuracy can be obtained.

FIG. 5 shows a fourth embodiment of the present invention. The basic configuration is the same as that of the rare gas discharge lamp shown in FIG. The difference is that the ends 4a and 4b of the translucent sheet 4 are overlapped on the external electrode 5, and the overlapped portion is ultrasonically welded. The ends 4a and 4b can be overlapped on the external electrode 6, and this part can be subjected to ultrasonic welding.

According to this embodiment, the overlapping portion 4
Since the ultrasonic welding of a and 4b is performed on the outer surface of the external electrode 5, the ultrasonic vibration acting on the light emitting layer 2A on the inner surface of the envelope is reduced. Therefore, as compared with the above-described embodiments, the separation of the light emitting layer 2A from the inner surface of the envelope can be significantly suppressed, and the light output can be improved.

FIG. 6 shows a fifth embodiment of the present invention. The basic structure is the same as that of the rare gas discharge lamp shown in FIG. The difference is that after a pair of external electrodes 5 and 6 are attached to the outer peripheral surface of the envelope 1 using an adhesive layer, a translucent sheet 4A such as PET resin is attached to the outer peripheral surface of the envelope 1. Is wound and adhered so that the external electrodes 5 and 6 are covered.

According to this embodiment, prior to winding the translucent sheet 4A around the outer peripheral surface of the envelope 1, a translucent material such as a silicone varnish is applied to the outer peripheral surface of the envelope 1. If an insulating film is formed, the dielectric strength between external electrodes can be improved.

FIG. 7 shows a sixth embodiment of the present invention. The basic structure is the same as that of the rare gas discharge lamp shown in FIG. The difference is that after a pair of external electrodes 5 and 6 are attached to the outer peripheral surface of the envelope 1 using an adhesive layer, the protection made of a heat-shrinkable resin such as PET resin is applied to the outer peripheral surface of the envelope 1. That is, the tube 12 was mounted so as to cover the external electrodes 5 and 6, and was thermally contracted. In addition, this protection tube 1
2 is, for example, 150 to 200 ° C.
By heating and shrinking to a certain degree, it is brought into close contact with the outer peripheral surface of the envelope 1.

According to this embodiment, although the mechanization and work efficiency are inferior to those of the above-described embodiments, since the adhesive layer is not used for the protective tube 12, the constituent members of the terminal and the adhesive are not used. There is no corrosion due to reaction with the components, a stable operating state can be maintained for a long time, and the protection tube 1
Since there is no seam in 2, peeling of the overlapping portion at the end of the translucent sheet 4 as in each of the above embodiments can be completely prevented.

In particular, a protective tube 1 is provided on the outer peripheral surface of the envelope 1.
Prior to mounting 2, the outer peripheral surface of the envelope 1 is
If a light-transmitting insulating film such as a varnish is formed, the dielectric strength between the external electrodes can be further increased.

FIG. 8 shows a seventh embodiment of the present invention. The basic structure is the same as that of the rare gas discharge lamp shown in FIG. The difference is that a protective tube 12 made of a heat-shrinkable resin such as PET resin is mounted on the outer peripheral surface of the sheet structure 3 and then heat-shrinked. After the protective tube 12 is mounted on the envelope 1 (the sheet structure 3), it is heated to, for example, about 150 to 200 ° C. and shrunk, so that the outer peripheral surface of the translucent sheet 4 is formed. Adhered to.

According to this embodiment, when the environment where the rare gas discharge lamp is applied is under severe environmental conditions or high safety standards, for example, a protective tube having excellent heat resistance and translucency is used. By covering the sheet structure 3 with the valve 12, a higher quality product can be provided.

In particular, the structure of this embodiment is shown in FIGS.
The present invention can be applied to the embodiments shown in FIGS.

It should be noted that the present invention is not limited only to the above-described embodiment, and for example, the first and second phosphors contained in the light emitting layer are excited by ultraviolet rays and emit light of the first phosphor. Any phosphor other than the lead-activated barium / zinc / magnesium silicate phosphor and the cerium / terbium-activated lanthanum phosphate phosphor can be used as long as the excitation region of the second phosphor is present in the region. . Alternatively, the aperture portion on the inner surface of the envelope may be omitted, and the light emitting layer may be formed on the entire inner surface of the envelope. Further, the overlapping portion at the end of the translucent sheet can be heat-welded, ultrasonic-welded, or combined with the welding in addition to the simple bonding.

[0039]

Next, an experimental example will be described. First, a phosphor coating solution obtained by mixing a lead-activated barium / zinc / magnesium silicate phosphor (first phosphor) and a cerium / terbium-activated lanthanum phosphate phosphor (second phosphor) is removed. It is applied to the entire inner surface of an envelope made of lead glass having a diameter of 8 mm, a thickness of 0.5 mm, and a length of 360 mm to form a light emitting layer. Next, an aperture having an opening angle of 75 ° is formed by forcibly peeling off a part of the light emitting layer using a scraper. The amount of the light emitting layer per 15 cm ² was 15 m.
g and the ratio of the first phosphor in the light emitting layer was 1.
It was set to 0, 2.0, and 3.0% by weight. Hereinafter, a rare gas discharge lamp was manufactured in the same manner as in the prior art shown in FIGS. The opening angle θ ₁ of the _first opening was set to 75 °, and the opening angle θ ₂ of the _second opening was set to 55 °.

This rare gas discharge lamp is incorporated in the lighting circuit shown in FIG. 13 and the output voltage (frequency is 30) of the inverter circuit.
KHz) to the rated voltage (2500V _0-P ),
When the illuminance of the original irradiation surface 8 mm away from the envelope was measured, the first phosphor was mixed 1.0% or 3.0% by weight as compared with the rare gas discharge lamp not mixed with the first phosphor. The improvement of about 5% was recognized in the sample, and the improvement of about 10% was recognized in the case of 2.0% by weight.

When the amount of the light emitting layer to be attached is changed in the range of 3 to 35 mg, the range of 5 to 30 mg is sufficient for practical use from the viewpoints of the illuminance of the original surface and the formation of the uniform light emitting layer. It was confirmed.

[0042]

As described above, according to the present invention, in the light emitting layer, the first and second phosphors are excited by the ultraviolet rays generated by the discharge, and the second phosphor has the emission spectrum of the first phosphor. , The excitation efficiency of the second phosphor is improved, and the amount of light emitted from the light emitting layer to the outside can be increased. Therefore, when the rare gas discharge lamp is applied to an OA device, the illuminance on the document surface can be further increased, so that it is possible to cope with high illuminance for improving the processing performance of the OA device.

In particular, the amount of the light emitting layer deposited was 5 per cm ^2.
Since it is set to ３０30 mg, the light output emitted from the first opening can be further improved in combination with the above configuration without changing the size of the envelope or the tube input. Therefore, for example, when the present invention is applied to a document irradiating device of an OA device, the illuminance of the document surface can be increased, and an improvement in reading quality can be expected.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is an excitation spectrum and emission spectrum characteristic diagram of a first phosphor mixed in a light emitting layer shown in FIG.

FIG. 3 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing a third embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a fourth embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing a fifth embodiment of the present invention.

FIG. 7 is a longitudinal sectional view showing a sixth embodiment of the present invention.

FIG. 8 is a longitudinal sectional view showing a seventh embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a rare gas discharge lamp according to the prior art.

FIG. 10 is a development view of a sheet structure according to the prior art.

FIG. 11 is a sectional view taken along line XX of FIG. 10;

FIG. 12 is a longitudinal sectional view for explaining a method for manufacturing a rare gas discharge lamp according to the prior art.

FIG. 13 is a circuit diagram of a lighting device for a rare gas discharge lamp according to the prior art.

FIG. 14 is an excitation spectrum and emission spectrum characteristic diagram of a lanthanum phosphate phosphor used in a light emitting layer of a rare gas discharge lamp according to the prior art.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 envelope 2A light emitting layer 2Aa first light emitting layer 2Ab second light emitting layer 2a aperture 3 sheet structure 4, 4A translucent sheet (insulating member) 4a, 4b end 5, 6 External electrodes 51, 61 Terminal 7 First opening 8 Second opening 9 Adhesive layer 12 Protective tube (insulating member)

Claims (7)

[Claims] 1. An envelope having a light-emitting layer on an inner surface thereof, and an outer peripheral surface of the outer envelope formed with a first opening and a second opening which are separated from each other over substantially the entire length thereof, and which are separated from each other. And a pair of band-shaped external electrodes made of a metal member arranged in such a manner that the light emitting layer includes at least first and second phosphors, and the first and second phosphors are first phosphors. A rare gas discharge lamp comprising a phosphor in which an excitation region of a second phosphor exists in a light emitting region of the body. 2. An envelope having a light-emitting layer on an inner surface thereof, and an outer peripheral surface of the outer envelope formed with a first opening and a second opening which are separated from each other over substantially the entire length thereof, and which are separated from each other. A pair of band-shaped external electrodes made of a metal member arranged as described above, and an insulating member mounted on the outer peripheral surface of the envelope so as to cover the external electrodes, wherein the light emitting layer is at least a first or a first layer. Second
And the first and second phosphors are phosphors in which the excitation region of the second phosphor exists in the light emission region of the first phosphor. 3. The rare gas discharge lamp according to claim 1, wherein the light emitting layer is formed by mixing at least first and second phosphors. 4. The light-emitting layer is formed by laminating first and second light-emitting layers, the first light-emitting layer is made of a first phosphor, and the second light-emitting layer is made of a second phosphor. Each formed in the body,
The first light emitting layer is disposed on the inner surface side of the envelope, and the second light emitting layer is disposed on the discharge space side.
The rare gas discharge lamp according to 1. 5. The phosphor according to claim 1, wherein the first phosphor is a lead-activated barium / zinc / magnesium silicate phosphor, and the second phosphor is a cerium / terbium-activated lanthanum phosphate phosphor. Or the rare gas discharge lamp according to 2. 6. The rare gas discharge lamp according to claim 1, wherein a total amount of the light emitting layer is set in a range of 5 to 30 mg per 1 cm ² . 7. The method according to claim 1, wherein the ratio of the first phosphor in the light emitting layer is set in a range of 0.5 to 10.0% by weight. Noble gas discharge lamp.