JPH08162064A - Fluorescent discharge lamp - Google Patents

Abstract

PURPOSE: To provide a fluorescent discharge lamp in which a cathode luminescent spot can be easily and surely formed by a thermoelectron emitting material. CONSTITUTION: A discharge electrode 4 having a metal sleeve 41; a mercury emitting body structure 42 having a cylindrical body 420 charged with a mercury emitting alloy and an alloy getter, which is inserted and fixed to the metal sleeve 41; and a metal coil 43 doubly wound inside and outside into a sleeve and having a thermoelectron emitting material provided on both inner and outer surfaces, which is inserted and fixed to the top end part of the metal sleeve 41, is adapted. The metal coil 43 generates a cathode luminescent spot during discharge, makes the discharge electrode act as a hot cathode to allow an improvement in emitting efficiency and a reduction in the tube voltage necessary to keep the discharge, and contributes to the saving of power consumption.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact fluorescent discharge lamp used as a backlight for liquid crystal display devices.

[0002]

2. Description of the Related Art In order to secure a necessary amount of mercury in a compact fluorescent discharge lamp having an outer diameter of about several mm without shortening an effective light emission length, the present applicant has proposed a mercury-releasing alloy and alloy in a cylindrical body. We have previously filed a Japanese patent application No. 4-91304 regarding a technique of adopting a mercury emitting structure filled with a getter as a discharge electrode.

[0003]

However, the thermoelectron emission action (γ action) obtained from the composition of the alloy getter described above.
A high tube voltage is required to maintain the discharge. Further, in order to increase the electron emission efficiency of the cathode in such a discharge electrode, even if a hollow type cathode is formed by forming a recess at the tip of the cylindrical body, the cathode drop voltage in that case depends on the composition of the alloy getter. It has been clarified by the present inventor that the effect of the hollow-type cathode is just one step that can be obtained.

Therefore, the inventor of the present invention intends to reduce the power consumption of such a small fluorescent discharge lamp, that is, to reduce the cathode drop voltage of the discharge electrode (to increase the conductance) to reduce the tube voltage of the fluorescent discharge lamp. From the viewpoint of lowering it and from the viewpoint of facilitating the formation of cathode bright spots and improving the luminous efficiency by increasing the current density in the hollow cathode, adopting an electron emitting substance in the discharge electrode using the mercury emitting structure. Was examined. According to this, since the discharge electrode is small, it is necessary to increase the space holding efficiency of the electron emitting substance by increasing the space efficiency, and in order to facilitate or ensure the formation of the cathode bright spot, the discharge electrode itself. It has been found that it is necessary to reduce the heat capacity of the device and to provide high current tightness, and it is necessary to adopt a structure commensurate with it.

An object of the present invention is to provide a fluorescent discharge lamp capable of holding an electron emitting substance while improving space efficiency. Another object of the present invention is to provide a fluorescent discharge lamp that can easily and surely form a cathode bright spot with an electron emitting material. Yet another object of the present invention is to provide a fluorescent discharge lamp having high luminous efficiency and excellent power consumption.

[0006]

[Means for Solving the Problems]

(1) As shown in FIGS. 1 to 3, the fluorescent discharge lamp according to the present invention has a metal sleeve and a mercury emitting structure in which a cylindrical body is filled with a mercury emitting alloy and an alloy getter and is inserted and fixed in the metal sleeve. And a metal coil, which is wound in a sleeve shape in a plurality of layers inside and outside, is provided with electron emitting substances on both the inside and outside surfaces, and is inserted and fixed to the tip of the metal sleeve. In order to strengthen the fixing force of the electron emitting substance to the metal coil, it is desirable to sinter and fix it. In order to particularly facilitate the generation of the cathode bright spot inside the metal coil, it is preferable to provide an insulating coating on the outer peripheral surface of the metal sleeve.

(2) Further, the fluorescent discharge lamp according to the present invention is the fourth
As illustrated in the figure, a mercury-releasing structure in which a mercury-releasing alloy and an alloy getter are filled in a cylinder, and a plurality of inner and outer layers wound in a sleeve shape to provide electron-emitting substances on both inner and outer surfaces of the cylinder. A discharge electrode comprising a metal coil inserted into and fixed to the outer periphery of the cylinder and protruding from the tip of the cylindrical body is used.
At this time, as illustrated in FIG. 5, one end of the wire constituting the metal coil can be led out from the container as a lead wire of the discharge electrode.

(3) The fluorescent discharge lamp according to the present invention is shown in FIG.
As illustrated in, adopting a discharge electrode comprising a metal coil and a mercury emitting structure filled in a hollow space of the metal coil in which a cylindrical body is filled with a mercury emitting alloy and an alloy getter, and at this time, In the metal coil, the electron emitting material is sintered and fixed on both the inner and outer surfaces, the wound element wires constituting it are not in contact with each other, and the mercury emitting structure is electrically connected to only one end of the element wire. Is connected to the outside of the container by conductive connection, that is, electrically connected to the outside of the container.

(4) The fluorescent discharge lamp according to the present invention is shown in FIG.
, A discharge electrode comprising a metal coil and a mercury emission structure filled in a cylindrical body with a mercury emission alloy and an alloy getter and arranged in a hollow space of the metal coil in a non-contact manner with the discharge electrode is adopted. At this time, the metal coil is
It is assumed that the electron emitting material is sintered and fixed on both the inner and outer surfaces, the wound element wires constituting it are not in contact with each other, and both ends of the element wires are conductively connected to the outside of the container.

(5) The fluorescent discharge lamp according to the present invention is shown in FIG.
As illustrated in FIG. 2, a cylindrical body is provided with a mercury-releasing structure in which a mercury-releasing alloy and an alloy getter are filled in the base end portion of the supporting body electrically conductively connected to the outside of the container, and the tip of the supporting body is provided. A discharge electrode formed by fixing a metal coil having a plurality of inner and outer layers wound in a sleeve shape and having electron emitting materials provided on both inner and outer surfaces is fixed to the portion.

[0011]

According to the above-mentioned means (1), the metal coil can hold a large amount of electron emitting substances on both the inner and outer surfaces due to the surface shape of the metal coil. This metal coil produces a cathode bright spot during discharge, makes the discharge electrode function as a hot cathode type, improves the luminous efficiency, and makes it possible to lower the tube voltage required to maintain the discharge and reduce the power consumption. Contribute. Further, since the metal coil is wound in multiple layers inside and outside, it is possible to prevent the metal coil from partially falling off due to partial disconnection of the wire. Further, the metal coil adopts an element wire having a small wire diameter to hold a large amount of electron emitting material while suppressing the heat capacity. At this time, a metal sleeve is used to support such a metal coil and the mercury emitting structure. The adoption prevents the discharge electrode from becoming large in the radial direction, and makes it possible to keep the heat capacity of the discharge electrode extremely small depending on the thickness of the metal sleeve, which facilitates the formation of the cathode bright spot. Also, the insulating coating provided on the outer peripheral surface of the metal sleeve is
The discharge between the discharge electrodes is limited to the metal coil. In other words, the glow discharge before the transition to the arc discharge is concentrated on the electron emitting material of the metal coil and the temperature of the metal coil is sufficiently raised, so that the transition to the arc discharge is facilitated and the energy due to the arc discharge is increased. The degree of concentration is also increased.
As a result, the cathode bright spots are more likely to be formed and high luminous efficiency can be obtained even at the time of low current discharge.

According to the above means (2), the structure in which the metal coil is inserted and fixed to the outer circumference of the cylindrical body of the mercury emitting structure can be connected to each other without the need for the metal sleeve, thereby reducing the number of parts. The metal coil provided on the mercury emitting structure causes a cathode bright spot to improve the luminous efficiency as in the case of the above-mentioned means (1).

According to the means (3) and (4) described above, the temperature can be increased by energizing the metal coil at the time of starting, so that the cathode bright spot can be formed more efficiently. A metal coil having an electron emitting substance sinter-fixed on the surface thereof produces a cathode bright spot during discharge similarly to the above, and it is not necessary to energize the metal coil after lighting.

According to the above-mentioned means (5), since it is possible to suppress the radial size increase of the discharge electrode as much as possible, it is possible to make the container extremely thin. In such a fluorescent discharge lamp, the metal coil can be used. By making the discharge electrode function as a hot cathode type, it is possible to lower the tube voltage required to maintain discharge and contribute to lower power consumption, and the metal coil is partially broken due to partial disconnection of the metal coil wire. It has the effect of preventing the situation of falling out.

[0015]

1 shows a fluorescent discharge lamp according to a first embodiment of the present invention. The fluorescent discharge lamp of the present embodiment consumes a few watts and is a small size used for a backlight of a liquid crystal display. In FIG. 1, 1 is a bulb made of straight glass, and 2 is a glass stem for closing both ends of the bulb 1 (the configuration of one end of the bulb is shown in the figure as a representative). An example is constructed. The container constructed in this way has an outer diameter of 2 m, for example.
It has a size of m to 4 mm and a total length of 50 mm to 300 mm. The bulb 1 has a phosphor coating (not shown) formed on the inner surface thereof, and an inert gas such as a mixture of neon, argon, or xenon, for example, 50 Tor.
The discharge electrode 4 is fixed to the introduction end of the lead wire 3 filled with r and introduced through the stem 2, and the interior of the container is hermetically sealed. The power consumption of the fluorescent discharge lamp of this embodiment is 0.6 to 1.5 W (watt) when the tube current is 3 to 5 mA (milliamperes) when the bulb has an outer diameter of 3 mm and the total length is 200 mm. It is considered as a degree.

The discharge electrode 4 has a metal sleeve 41 and
A mercury-releasing structure 42 in which a cylindrical body 420 is filled with a mercury-releasing alloy and an alloy getter and is inserted and fixed in the metal sleeve 41.
And a metal coil 43 which is wound in a sleeve shape in a double manner and is provided with an electron emitting substance on both inner and outer surfaces thereof, for example, the entire surface, and which is inserted and fixed to the tip of the metal sleeve 41.

In the metal coil 43, for example, a 6 MG tungsten wire is closely wound inside and outside, and an electron emitting material is sintered and fixed around the tungsten wire, the outside diameter is 0.8 mm, and the length is about 2 to 3 mm. It consists of The electron emitting substance may be mainly composed of a carbonate compound such as barium, but if stability in air is taken into consideration, compounds such as barium tungstate (barium tungstate) and strontium tungstate should be adopted. You can The sinter-fixed electron emitting material is firmly held by the wire of the metal coil 43.

The cylindrical body 420 is made of a conductive metal and can be made of an electrode material such as stainless steel or nickel. The mercury-releasing alloy can be composed mainly of an intermetallic compound of titanium and mercury. The alloy getter can be mainly composed of an intermetallic compound consisting of one of zirconium or titanium and one of aluminum or nickel. The alloy getter has a getter function of absorbing the impure gas inside the valve, as is clear from its composition. The mercury-releasing alloy and the alloy getter are powders, and they are mixed and press-filled into the cylindrical body 420. According to the present embodiment, the mercury emitting structure 42 has an outer diameter of 0.8 mm and a length of about 2 mm.

The metal sleeve 41 can be made of an electrode material such as stainless steel, nickel or sintered metal, and has a wall thickness of 50 μm, an inner diameter of 0.8 mm and a length of about 2.5 mm. The leading end portion of the lead wire 3 is formed in a flat shape and is not particularly limited, but the metal sleeve 41 is fixedly supported by the flat portion 30 by laser welding. At the back of the metal sleeve 41, the mercury emission structure 4
2 is inserted, and the metal coil 43 is inserted in the tip portion thereof. In this embodiment, both the mercury emitting structure 42 and the metal coil 43 are fixed to the metal sleeve 41 during the laser welding. Particularly, in the discharge electrode 4 of this embodiment, the outer peripheral surface of the metal sleeve 41 and the flat portion 30 of the lead wire 3 are coated with an insulating coating such as alumina.

According to the present embodiment, the metal coil 43 can hold a large amount of electron emitting material on the entire surface because of its surface shape. This metal coil 43 produces a cathode bright spot during discharge, and makes the discharge electrode 4 function as a hot cathode type, thereby improving the luminous efficiency. Further, it is possible to lower the tube voltage required to maintain the discharge, which contributes to lower power consumption. In addition, the metal coil 43 can employ an element wire having a small wire diameter to hold the electron emitting substance while suppressing the heat capacity. At this time, since the metal sleeve 41 is used to support the metal coil 43 and the mercury emitting structure 42, it is possible to prevent the discharge electrode 4 from becoming large in the radial direction, and the metal sleeve 41 is formed thin. Therefore, the heat capacity of the discharge electrode 4 can be made extremely small, and also in this respect, the formation of the cathode bright spot can be facilitated and the luminous efficiency can be improved.

The insulating coating provided on the outer peripheral surface of the metal sleeve 41 limits the discharge between the pair of opposed discharge electrodes 4 to the metal coil 43. In other words, the glow discharge before the transition to the arc discharge is concentrated on the electron emitting material of the metal coil 43 and the temperature of the metal coil 43 is sufficiently raised, so that the transition to the arc discharge is facilitated and the arc discharge is facilitated. Concentration of energy due to is also increased. Therefore, even at the time of low current discharge, the formation of the cathode bright spot becomes easier, and high luminous efficiency can be realized.

Further, since the metal coil 43 is wound inside and outside twice, it is possible to prevent the metal coil 43 from partially falling off due to partial disconnection of the wire.

2 and 3 show a modification of the embodiment shown in FIG. Like the discharge electrode 9 shown in FIG. 2, the metal coil 43 can be set in a non-projecting state from the metal sleeve 41. Further, like the discharge electrode 10 shown in FIG. 3, a structure in which the tip of the metal sleeve 101 is opened through a comparatively small through hole 102 and the surface of the metal sleeve 101 and the flat portion 30 is provided with an insulating coating can be adopted. . The electrode structure shown in FIG. 3 can favorably concentrate the discharge through the through hole 102.

FIG. 4 shows a fluorescent discharge lamp according to the second embodiment of the present invention. The discharge electrode 5 of this embodiment is wound in a sleeve-like manner with the same mercury-releasing structure 42 as described above and is double wound inside and outside, and an electron-emitting substance is provided on the entire surface thereof, and the discharge electrode 5 is closely fitted and fixed to the outer peripheral surface of the cylindrical body 420. It is provided with a metal coil 53 protruding from the tip of the tubular body 420. In short, the point that the metal coil 53 is fitted and fixed to the outer periphery of the mercury emitting structure 42 is different from the above embodiment. In this embodiment, the mercury emitting structure 42 is fixedly supported by the cap 31 provided at the introduction end of the lead wire 3. The other points are similar to those of the above-described embodiment, and thus detailed description thereof is omitted.

According to this embodiment, the structure in which the metal coil 53 is closely fitted and fixed to the outer circumference of the cylindrical body 420 can be connected to each other without the need for the metal sleeve 41, and the number of parts can be reduced. . The metal coil 53 protruding from the tip of the mercury emitting structure 42 produces a cathode luminescent spot during discharge through the action of the electron emitting substance therein, similarly to the embodiment of FIG. 1, and functions the discharge electrode 5 as a hot cathode type. Let If an insulating coating such as alumina is applied to the outer peripheral surface of the metal coil 53, higher luminous efficiency can be realized as in the above embodiment.

FIG. 5 shows a fluorescent discharge lamp according to a modification of FIG. The discharge electrode 6 of this embodiment is a metal coil 63.
4 is different from the embodiment of FIG. 4 in that one end 630 of the element wire constituting the above is led out from the container as a lead wire of the discharge electrode 6. In this embodiment, the mercury emitting structure 42 is the metal coil 6
Since it is supported by No. 3, a filament having a larger wire diameter than that of the embodiment shown in FIG. 4 is used. When the diameter of the wire is not thickened, the metal coil 63 may be formed with three or more inner and outer windings. This embodiment can reduce the number of parts of the discharge electrode as compared with the embodiment of FIG. 4 in terms of the support structure of the discharge electrode. The metal coil 63 protruding from the tip of the mercury-emitting structure 42 produces a cathode bright spot during discharge as in the embodiment of FIG. 1 to improve luminous efficiency. If the outer peripheral surface of the metal coil 63 is provided with an insulating coating such as alumina, higher luminous efficiency can be obtained as in the above embodiment. If there is a possibility that the one end portion 360 of the coil 63 and the stem 2 may be incompletely sealed, a lead wire made of stainless steel or nickel is used.
The one end 360 of the coil 36 may be fixedly coupled thereto.

FIG. 6 shows a fluorescent discharge lamp according to the third embodiment of the present invention. The discharge electrode 7 of this embodiment comprises a metal coil 73, and a mercury emission structure 42 which is arranged in a hollow space of the metal coil 73, in which a cylindrical body 420 is filled with a mercury emission alloy and an alloy getter. At this time, the electron emitting material is sintered and fixed on the entire surface of the metal coil 73, and the wound element wires constituting the metal coil 73 are not in contact with each other, and the one end portion 731 of the element wire with the mercury emission structure 42 is formed. Only are electrically connected by laser welding or the like, and the other end 730 of the wire is led out from the container. The mercury emitting structure 42 is fixed to the cap 31 provided on the lead wire 3 as in the embodiment shown in FIG. The compositions of the mercury emitting alloy, the alloy getter and the electron emitting material are the same as those described in the embodiment of FIG.
If there is a possibility that the one end 730 of the coil 73 and the stem 2 may be incompletely sealed as described above, another lead wire may be adopted and the one end 730 of the coil 73 may be connected thereto. Good.

According to the embodiment shown in FIG. 6, the metal coil 73 can be energized at the time of start-up through the other end 730 of the wire of the metal coil 73 and the lead wire 3, whereby a metal composed of a tungsten filament is formed. Since the temperature of the coil 73 can be raised, the cathode bright spot can be formed more efficiently on the electron emitting material. Further, it becomes possible to easily light up even in a completely dark place. It is not necessary to energize the metal coil 73 after lighting.

FIG. 7 shows a fluorescent discharge lamp according to the fourth embodiment of the present invention. The discharge electrode 8 of this embodiment includes a metal coil 83 and a mercury emission structure 42 which is filled in a cylindrical body 420 with a mercury emission alloy and an alloy getter and is arranged in the hollow space of the metal coil 83 in a non-contact manner. In the metal coil 83, the electron emitting material is sintered and fixed on the entire surface, the wound element wires constituting it are not in contact with each other, and both ends 830 and 831 of the element wire are led out from the container. It consists of The other structure is similar to that of the embodiment shown in FIG. According to the fourth embodiment, it is possible to energize the metal coil 83 through both ends 830 and 831 of the wire of the metal coil 83 at the time of starting, and thereby the temperature of the metal coil 83 made of a tungsten filament can be raised. Therefore, it is possible to further facilitate the formation of the cathode bright spot through the electron emitting substance.

FIG. 8 shows a fluorescent discharge lamp according to the fifth embodiment of the present invention. The discharge electrode 11 of this embodiment has a structure in which the mercury emitting structure 42 and the metal coil 43 described in FIG. 1 are arranged in series in the axial direction of the bulb 1. The mercury emitting structure 42 is fixed to the base end portion of the flat portion 30 of the lead wire 3, and the metal coil 43 is fixed to the tip end portion of the flat portion 30. Spot welding or the like can be used as the fixing means. In this embodiment, in order to ensure the spot welding of the metal coil 43 having a small wire diameter, a cylindrical body 111 made of nickel or the like is inserted into a part of the hollow portion of the metal coil 43, and the cylindrical body 111 is also spot-welded at the time of spot welding. The metal coil 43 is melted and stably fixed to the flat portion 30. Cylinder 11
It is also possible to replace 1 with a cylinder. In the present embodiment, the surfaces of the flat portion 30 and the mercury-releasing structure 42 are coated with the insulating coating.

According to this embodiment, like the first embodiment shown in FIG. 1, the metal coil 43 causes the discharge electrode 11 to function as a hot cathode type, thereby making it possible to lower the tube voltage required to maintain discharge. It is possible to obtain an effect of contributing to low power consumption and preventing a situation where the metal coil 43 is partially dropped due to a partial disconnection of a wire of the metal coil 43, and further, the metal coil 43 and the mercury emission. Since the structural bodies 42 are arranged in series and the size increase of the discharge electrode 11 in the radial direction can be suppressed as much as possible, it is possible to easily cope with the miniaturization of the container. In addition, in the fifth embodiment, the lead wire 3 also serves as a support for the mercury emitting structure 42 and the metal coil 43, but it is also possible to employ a support different from the lead wire.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited thereto, and needless to say, various modifications can be made without departing from the scope of the invention. Yes. For example,
A container such as a glass bulb is not limited to a straight pipe type, and an appropriate shape can be adopted. Further, the supporting structure of the discharge electrode with respect to the lead wire is not limited to the laser welding of the lead wire or the structure using the cap, and can be appropriately changed. Also, in the embodiment of FIGS. 6 and 7, the metal coils 73, 8
The strands of 3 are shown wound with a relatively large spacing, but it should be understood that this is a drawing consideration for emphasizing that the strands are not in contact with each other. .
Therefore, the size of the space does not matter, and the space may be insulated in some sense by, for example, a physical space or an electron emitting material. The metal coil is not limited to a double-wound structure inside and outside, and in other words, depending on the wire diameter, it is also possible to employ a coil wound in three or more layers to satisfy the required mechanical strength. is there.

Further, in the discharge electrode of each of the above embodiments,
In order to deal with the deterioration of the immediate lighting performance caused by the lack of initial electrons in the dark, that is, the dark effect,
A substance that excites and emits light according to a change in the electric field intensity to supplement initial electrons for discharge can be placed on the surface of the discharge electrode or in the vicinity thereof. Examples of such a substance include, for example, a light emitting body for electroluminescence (for example, ZnS: Cu).
Such as electroluminescent phosphor) can be adopted. Such an electroluminescent light emitter can be employed as a part or all of the insulating coating.
The formation of coatings containing such materials includes radiation, vacuum deposition,
Alternatively, sputtering or the like can be adopted. Spraying is a method in which each mixed powder of substances to be formed into films is melted by heat and then sprayed and fixed to an object in a molten state. In addition, on the outer circumference of the cylindrical body of the mercury emitting structure as shown by 42, an electron emitting material such as LaB ₆ , an electroluminescent light emitting body such as an electroluminescent phosphor (ZnS: Cu) for the dark effect countermeasure, The mixed powder of Al ₂ O ₃ and Al ₂ O ₃ fixed by spraying can be used for various discharge electrodes. At this time, Al ₂ O ₃ is mixed for the purpose of enhancing the bond strength of the substance fixed by radiation.

[0034]

Due to the surface shape of the metal coil, many electron-emitting materials can be held on both the inner and outer surfaces. This metal coil produces a cathode bright spot during discharge and makes the discharge electrode function as a hot cathode type, and can improve the luminous efficiency. Further, it is possible to lower the tube voltage required to maintain the discharge, thereby contributing to lower power consumption. Since the metal coil is wound in multiple layers inside and outside, it is possible to prevent a situation where the metal coil is partially dropped due to a partial disconnection of the wire. Therefore, a long life of the fluorescent discharge lamp can be achieved.

Further, the metal coil adopts an element wire having a small wire diameter to hold the electron emitting substance while suppressing the heat capacity to a small value. At this time, by adopting a metal sleeve for supporting such a metal coil and the mercury emitting structure, it is possible to prevent the discharge electrode from becoming large in the radial direction and keep the heat capacity of the discharge electrode extremely small depending on the thickness of the metal sleeve. Therefore, the cathode bright spot can be easily formed.

Further, the insulating coating provided on the outer peripheral surface of the metal sleeve limits the discharge between the discharge electrodes to the metal coil. In other words, the glow discharge before the transition to the arc discharge is concentrated on the electron emitting material of the metal coil. As a result, the temperature of the metal coil is sufficiently raised, the transition to arc discharge is facilitated, and the energy concentration due to arc discharge is increased. As a result, the cathode bright spots are more easily formed even at the time of low current discharge, and high luminous efficiency can be obtained.

Furthermore, by arranging the metal coil and the mercury-releasing structure in series inside the container, it is possible to suppress an increase in the radial dimension of the discharge electrode as much as possible. it can.

Further, the structure in which the metal coil is inserted and fixed to the outer circumference of the cylindrical body of the mercury-releasing structure makes it possible to connect the both without using the metal sleeve and reduce the number of parts.

By making the metal coil energizable, the temperature of the metal coil can be raised at the time of starting, so that the cathode bright spot can be formed more efficiently.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a fluorescent discharge lamp according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a fluorescent discharge lamp according to a modified example of the first embodiment.

FIG. 3 is a partial cross-sectional view of a fluorescent discharge lamp according to another modification of the first embodiment.

FIG. 4 is a partial sectional view of a fluorescent discharge lamp according to a second embodiment of the present invention.

FIG. 5 is a partial sectional view of a fluorescent discharge lamp according to a modification of the second embodiment.

FIG. 6 is a partial sectional view of a fluorescent discharge lamp according to a third embodiment of the present invention.

FIG. 7 is a partial sectional view of a fluorescent discharge lamp according to a fourth embodiment of the present invention.

FIG. 8 is a partial sectional view of a fluorescent discharge lamp according to a fifth embodiment of the present invention.

[Explanation of symbols]

 1 Valve 2 Stem 3 Lead Wire 4 Discharge Electrode 41 Metal Sleeve 42 Mercury Emitting Structure 420 Cylindrical Body 43 Metal Coil 5 Discharge Electrode 53 Metal Coil 6 Discharge Electrode 63 Metal Coil 7 Discharge Electrode 73 Metal Coil 8 Discharge Electrode 83 Metal Coil 9 Discharge Electrode 10 Discharge electrode 101 Metal sleeve 11 Discharge electrode

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Ryuji Kashio 2-17-8 Chuo 2-chome, Ota-ku, Tokyo Inside Erebum Co., Ltd.

Claims (8)

[Claims] 1. A fluorescent discharge lamp in which a discharge electrode is built in a container having a phosphor coating on its inner surface, wherein the discharge electrode comprises a metal sleeve and a cylinder filled with a mercury-releasing alloy and an alloy getter. Provided are a mercury-releasing structure inserted and fixed in the metal sleeve, and a metal coil wound in a sleeve shape in a plurality of inner and outer layers and provided with electron-emitting substances on both inner and outer surfaces, and inserted and fixed at the tip of the metal sleeve. A fluorescent discharge lamp characterized in that 2. The fluorescent discharge lamp according to claim 1, wherein the electron emitting material provided on the metal coil is fixed by sintering. 3. The fluorescent discharge lamp according to claim 1, wherein the outer peripheral surface of the metal sleeve is provided with an insulating coating. 4. A fluorescent discharge lamp in which a discharge electrode is housed in a container having a phosphor coating on the inner surface thereof, wherein the discharge electrode has a mercury-emitting alloy and alloy getter filled in a cylindrical body. And a metal coil which is wound in a sleeve-like manner and is provided with electron-emitting substances on both inner and outer surfaces, is inserted and fixed to the outer periphery of the cylindrical body, and is projected from the tip of the cylindrical body. A fluorescent discharge lamp characterized in that 5. The fluorescent discharge lamp according to claim 4, wherein one end of an element wire forming the metal coil is led out of the container as a lead wire of a discharge electrode. 6. A fluorescent discharge lamp in which a discharge electrode is built in a container having a phosphor coating on its inner surface, wherein the discharge electrode comprises a metal coil and a cylinder filled with a mercury-releasing alloy and an alloy getter. And a mercury emitting structure arranged in the hollow space of the metal coil, wherein the metal coil has an electron emitting substance sintered and fixed on both inner and outer surfaces thereof, and between the wound element wires constituting the metal coil. A fluorescent discharge lamp which is non-contact and is electrically connected to the mercury-releasing structure only at one end of the wire, and the other end of the wire is conductively connected to the outside of the container. 7. A fluorescent discharge lamp in which a discharge electrode is built in a container having a phosphor coating on its inner surface, wherein the discharge electrode comprises a metal coil and a cylinder filled with a mercury-releasing alloy and an alloy getter. The metal coil is provided with a mercury-releasing structure arranged in a hollow space of the metal coil in a non-contact manner with the metal coil. A fluorescent discharge lamp characterized in that the wires are not in contact with each other, and both ends of the wires are electrically connected to the outside of the container. 8. A fluorescent discharge lamp in which a discharge electrode is built in a container having a phosphor coating on its inner surface, wherein the discharge electrode is provided on a base end portion of a support body electrically conductively connected to the outside of the container. A cylindrical body is provided with a mercury-releasing structure filled with a mercury-releasing alloy and an alloy getter, and an electron-emitting substance is provided on both the inner and outer surfaces of the support at the inner and outer surfaces by being wound in a sleeve-like manner. A fluorescent discharge lamp comprising a fixed metal coil fixed thereto.