JP2001338614A - Fluorescent lamp and discharge lamp lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent lamp and a discharge lamp lighting device which prevents heat deterioration of a lamp base due to discharge generated between lead wires when a filament electrode is broken in the last period of life. SOLUTION: An almost rectangular flat divider plate 10 is provided as an arc-extinguishing means arranged between lead wires 3, 3 protruding from a base stand 4 formed at an end of a light-emitting tube 6 inwardly protruding. When discharge occurs between the lead wires 3, 3 with a breaking of a filament electrode 2 toward its end of life, the lead wires 3 gets shorter fused by the heat of discharge, the divider plate 10 extending a discharge pass as a result. With this, discharge cannot jump across the divider plate 10 and the arc is extinguished, heat generation from the lead wires thus suppressed. As a result, a problem such as a lamp base 1 made of a resin mold suffering heat deterioration can be prevented, doing without bothering to heat the base stand 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp having electrodes and a discharge lamp lighting device for lighting the fluorescent lamp.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, for example, an arc tube 6 in which at least one pair of filament electrodes is sealed.
And a compact fluorescent lamp provided with a base 1 of a resin molded product attached so as to close one end of the arc tube 6.

As shown in FIG. 7, lead wires 3, mainly made of iron or nickel, are provided at both ends of the filament electrode 2.
One end of each of the lead wires 3 is connected to the other end of the lead wire 3, and the other end of the lead wire 3 is supported by a base 4 mainly made of soft glass, which is formed at one end of the arc tube 6 so as to project inward. 4, it is led out to the base 1 outside the arc tube 6.
The filament electrode 2 has two lead wires 3, 3
And is arranged with a gap from the base 4.

On the other hand, a lighting device for lighting a fluorescent lamp includes a type in which the filament electrode 2 is heated even after lighting,
There is a type in which the filament electrode 2 is not heated after lighting. In general, there are many types of high-frequency lighting devices that include a filament electrode heating circuit and heat the filament electrode 2 even after the lamp is turned on.

[0005]

By the way, in the high-frequency lighting device provided with the filament electrode heating circuit, when the filament electrode 2 is disconnected at the end of the life of the fluorescent lamp, etc.,
Due to the presence of the filament electrode heating circuit, for example, FIG.
As shown in FIG. 5, a discharge 5 is generated between the lead wires 3 supporting the filament electrode 2. In particular, in a high-frequency lighting device having a constant-current filament electrode heating circuit, the voltage between the leads 3 and 3 is increased so as to maintain a constant current, and the leads 3 and 3 are heated. Then, as shown in FIG. 9, when the lead wire 3 is melted and shortened by the heat generated by the discharge 5, the base 4 supporting the lead wire 3 is also heated, and further problems such as the base 1 being thermally degraded occur. There was a problem of doing.

As described above, for example, a fluorescent lamp as shown in FIG. 10 has been considered for the thermal deterioration of the base 1 caused by an abnormal temperature rise occurring in the lead wires 3 and 3 (Japanese Patent Laid-Open No. Hei 10-31975). Reference).

In this fluorescent lamp, a thin portion 4a is formed on the base 4 with a reduced thickness. Accordingly, when the filament electrode 2 is disconnected and a discharge occurs between the lead wires 3, the thin portion 4 a is broken by heat generated by the discharge, and the outside air flows into the arc tube 6 to stop the discharge. Thus, it is possible to prevent a problem caused by an abnormal rise in the electrode temperature.

However, when the thin portion 4a is formed, the mechanical strength is reduced and the fluorescent lamp is easily broken.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and when a filament electrode is disconnected at the end of its life, a fluorescent lamp and a discharge lamp lighting for preventing thermal deterioration of a base due to discharge generated between lead wires. Provide equipment.

[0010]

In order to achieve the above object, the invention according to claim 1 comprises an arc tube having a base attached to at least one end, at least one pair of filament electrodes housed inside the arc tube, A fluorescent lamp comprising: one end connected to each filament electrode; and at least two leads leading to the other end of the arc tube outside the arc tube. Characterized in that it comprises an arc extinguishing means for extinguishing the discharge generated in the end of the life, when the filament electrode is disconnected at the end of life and a discharge occurs between the lead wires, the arc extinguishing means extinguishes the discharge, Generation of heat from the lead wire can be suppressed to prevent thermal deterioration of the base.

According to a second aspect of the present invention, in the first aspect of the invention, the die is formed of a resin molded product, and the arc extinguishing means extinguishes the discharge to suppress the generation of heat from the lead wire. This makes it possible to prevent thermal deterioration even when the die is a resin molded product that is easily thermally deteriorated.

According to a third aspect of the present invention, in the first or second aspect of the present invention, a base is provided for supporting the lead wires, and the arc extinguishing means is a partition plate protruding from the base and disposed between the lead wires. When a discharge occurs between the lead wires due to the breakage of the filament electrode, when the lead wire is melted and shortened by the heat of the discharge, the partition plate extends the discharge path to extinguish the discharge, and the lead wire is extinguished. The generation of heat from the heat can be suppressed.

According to a fourth aspect of the present invention, in the third aspect of the present invention, a storage material in which a highly insulating gas is stored is attached to the partition plate. When a discharge occurs, the occlusion substance is heated by the discharge and a highly insulating gas is released, so that the discharge is reliably extinguished and the generation of heat from the lead wire can be further suppressed.

According to a fifth aspect of the present invention, in the third or fourth aspect of the present invention, a different amount of the electron emitting material is applied to each of the pair of filament electrodes, and the lead is connected to the filament electrode having a small amount of the electron emitting material. It is characterized by the fact that a partition plate is provided only between the wires, and at the end of life, the filament electrode with a small amount of electron emitting material is consumed before the filament electrode with a large amount of electron emitting material, and the wire breaks down due to consumption of the electron emitting material, It is only necessary to provide a partition plate only on one of the filament electrode sides where the amount of the electron-emitting substance is small, and the cost can be reduced.

The invention of claim 6 is the invention of claims 3 to 5, characterized in that a plurality of partition plates are provided between the lead wires, and the material of the partition plates is made of an insulating material. With such a partition plate, the charged particles constituting the discharge can be diffused and easily extinguished, the arc can be extinguished more reliably, and the generation of heat from the lead wire can be further suppressed.

The invention of claim 7 is the invention of claims 3 to 5, characterized in that a plurality of partition plates are provided between the lead wires, and the material of the partition plates is made of a ferromagnetic material. The discharge between the lead wires is divided by the partition plate consisting of the body,
It is possible to increase the electric field intensity between the lead wires necessary to maintain each of the divided discharges, thereby extinguishing the discharge between the lead wires and suppressing the generation of heat from the lead wires. .

According to an eighth aspect of the present invention, in the invention of the seventh aspect, a notch is provided at an end of the partition plate, and a discharge occurs between the lead wires, and the lead wire is melted by the heat of the discharge. When the length is shortened, the discharge is guided to the notch of the partition plate, so that the magnetic flux generated by the discharge causes an electromagnetic force to act on the discharge by a magnetic field formed through the partition plate, and the discharge can be drawn into the partition plate. As a result, it is possible to divide the discharge between the lead wires and increase the electric field strength necessary to maintain each of the divided discharges, extinguish the discharge between the lead wires, and generate heat from the lead wires. Can be suppressed.

According to a ninth aspect of the present invention, there is provided a fluorescent lamp according to any one of the first to eighth aspects, further comprising a high-frequency lighting circuit for applying a high-frequency alternating voltage to light the filament. When the high-frequency lighting circuit raises the voltage between the lead wires and causes a discharge between the lead wires when the wire breaks, the arc extinguishing means suppresses the heat generation from the lead wires by extinguishing the discharge. Thus, heat deterioration of the base can be prevented.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) The basic configuration in this embodiment is common to that of the conventional example. Only parts will be described in detail.

In this embodiment, as shown in FIGS. 1A and 1B, a partition plate 10 serving as an arc extinguishing means protruding from the base 4.
Is provided between the lead wires 3. The partition plate 10 is made of an insulating material and has, for example, a height of about 10 mm and a width of 10 mm.
It is formed in a substantially rectangular flat plate having a thickness of about 1 mm, and is arranged with a gap so as to be substantially perpendicular to the longitudinal direction of the filament electrode 2.

At the end of life, when the filament electrode 2 is disconnected and a discharge occurs between the lead wires 3 and 3, when the lead wire 3 is melted and shortened by the heat of the discharge, the partition plate 10 extends the discharge path long. It will be. As a result, the discharge is extinguished without being able to jump over the partition plate 10 and the generation of heat from the lead wire 3 can be suppressed. as a result,
A base 1 made of a resin molded product without heating the base 4
Can be prevented from being thermally degraded.

Further, an occlusion substance in which a highly insulating gas such as hydrogen or nitrogen is occluded may be attached to the partition plate 10. When a discharge occurs between the lead wires 3 and 3, the occlusion substance is heated by the discharge and a highly insulating gas is released, so that the discharge is surely extinguished and the heat generated from the lead wire 3 is reduced. It can be further suppressed. (Embodiment 2) Since the basic configuration in this embodiment is common to Embodiment 1, the same reference numerals are given to the common parts, and the description thereof will be omitted, and only the characteristic parts of this embodiment will be described in detail. I do.

In this embodiment, as shown in FIG. 2, the filament electrode 2b of the pair of filament electrodes 2a and 2b
The partition plate 10 of the first embodiment is provided only on the side.

A different amount of the electron emitting material 8 is applied to each of the filament electrodes 2a and 2b, and the applied amount of the electron emitting material 8 on the filament electrode 2a side is made larger than the applied amount on the filament electrode 2b side. ing.

The electron emitting material 8 on the filament electrode 2b side
Is applied less than the filament electrode 2a side, so that it is consumed earlier than the filament electrode 2a side at the end of life. Then, the temperature of the filament electrode 2b in which the electron emitting material 8 has been exhausted is locally increased, and the filament electrode 2b is disconnected before the filament electrode 2a.

Therefore, in this embodiment, the partition plate 1 is provided only on the side of the filament electrode 2b where the amount of application of the electron emitting substance 8 is small.
0 may be provided, and the cost can be reduced as compared with the first embodiment. (Embodiment 3) Since the basic configuration in this embodiment is common to Embodiment 1 or 2, the same reference numerals are given to the common parts, and the description thereof will be omitted, and only the characteristic parts of this embodiment will be described in detail. Will be described.

In this embodiment, as shown in FIGS. 3A and 3B, two partition plates 10 are provided between the lead wires 3.

When the filament electrode 2 is broken and a discharge is generated between the lead wires 3 and the lead wire 3 is melted and shortened by the heat of the discharge, the two partition plates 10 made of insulating material are removed. The charged particles constituting the discharge can be diffused and easily extinguished, the discharge can be surely extinguished, and the generation of heat from the lead wire 3 can be further suppressed.

Incidentally, the material of the partition plate 10 may be a ferromagnetic material.
Thus, the electric field intensity between the lead wires 3 and 3 necessary for maintaining the divided discharges can be increased. As a result, the discharge between the lead wires 3 and 3 is extinguished, and the generation of heat from the lead wire 3 can be suppressed.

In this embodiment, two partition plates 10 are provided, but three or more partition plates may be provided. (Embodiment 4) Since the basic configuration of this embodiment is common to that of Embodiment 3, the same reference numerals are given to the common parts and the description thereof will be omitted, and only the features that are characteristic of this embodiment will be described in detail. I do.

In this embodiment, as shown in FIGS. 4 (a) and 4 (b), the two partition plates 10 made of the ferromagnetic material according to the third embodiment are provided at substantially the center of the leading edge of each of them. Notch 10
a is provided.

When the filament electrode 2 is disconnected and a discharge is generated between the lead wires 3 and the lead wire 3 is melted and shortened by the heat of the discharge, the discharge is cut off by the notches 10a and 10a of the partition plates 10 and 10. The magnetic field generated by the discharge through the partition plates 10 causes an electromagnetic force to act on the discharge, so that the discharge can be drawn into the partition plates 10. As a result, it is possible to divide the discharge between the lead wires 3 and 3 and increase the electric field intensity between the lead wires 3 and 3 necessary to maintain each of the divided discharges. This extinguishes the discharge between the lead wires 3 and 3,
Generation of heat from the lead wire 3 can be suppressed.

The above-described fluorescent lamp or the fluorescent lamp of any of the first to third embodiments is lit by a discharge lamp lighting device as shown in FIG.

The discharge lamp lighting device includes a rectifying / smoothing circuit 22 for rectifying and smoothing a commercial power supply 21, and a high frequency lighting such as an inverter circuit for converting a DC voltage of the rectifying / smoothing circuit 22 into a high frequency alternating voltage and applying the voltage to a fluorescent lamp. A high frequency lighting circuit 23 comprising a circuit 23 and an electrode preheating capacitor 24 having both ends connected to the filament electrodes 2 and 2 of the fluorescent lamp.
The fluorescent lamp is turned on at a high frequency by applying an alternating voltage to the fluorescent lamp.

In such a discharge lamp lighting device, when the filament electrode 2 of the fluorescent lamp is disconnected, the high frequency lighting circuit 23 raises the voltage between the leads 3 and 3 to generate a discharge between the leads 3 and 3. Even if one or more partition plates 1
By extinguishing the discharge, the generation of heat from the lead wire 3 can be suppressed, and thermal deterioration of the base 1 can be prevented.

[0036]

According to the first aspect of the present invention, there is provided an arc tube having a base attached to at least one end, at least one pair of filament electrodes housed in the arc tube, one end connected to each filament electrode, A fluorescent lamp having at least two or more leads led out to a base outside the arc tube, wherein the arc extinguishing means extinguishes a discharge generated between the leads when the filament electrode is disconnected. When the filament electrode breaks at the end of its life and a discharge occurs between the lead wires, the arc extinguishing means extinguishes the discharge, thereby suppressing the generation of heat from the lead wire and reducing the thermal degradation of the die. There is an effect that it can be prevented.

According to the second aspect of the present invention, since the base is formed of a resin molded product, the arc extinguishing means can extinguish the discharge and suppress the generation of heat from the lead wire, thereby making the base easily heat-degraded. Thermal deterioration can be prevented even as a molded product.

According to a third aspect of the present invention, the base for supporting the lead wire is provided, and the arc-extinguishing means is a partition plate protruding from the base and arranged between the lead wires. When a discharge occurs between wires, if the lead wire melts and becomes shorter due to the heat of the discharge, the partition plate extends the discharge path to extinguish the discharge and suppress the generation of heat from the lead wire. There is.

According to the fourth aspect of the present invention, when the occluded substance in which a gas having a high insulating property is occluded is attached to the partition plate, when the filament electrode is disconnected and a discharge is generated between the lead wires, the occluded substance is discharged. Is heated to release a highly insulating gas, so that the arc can be surely extinguished and the generation of heat from the lead wire can be further suppressed.

According to a fifth aspect of the present invention, a different amount of the electron emitting material is applied to each of the pair of filament electrodes, and a partition plate is provided only between the lead wires connected to the filament electrode having less electron emitting material. So at the end of life,
Since the filament electrode with a small amount of electron-emitting material is consumed before the filament electrode with a large amount of electron-emitting material, and the wire breaks due to the consumption of the electron-emitting material, a partition plate may be provided only on one filament electrode side with a small amount of the electron-emitting material. This has the effect of reducing costs.

According to the invention of claim 6, since a plurality of partition plates are provided between the lead wires and the material of the partition plate is made of an insulating material, the charged particles constituting the discharge can be easily diffused and eliminated. There is an effect that the arc can be more reliably extinguished and the generation of heat from the lead wire can be further suppressed.

According to the seventh aspect of the present invention, since a plurality of partition plates are provided between the lead wires and the partition plate is made of a ferromagnetic material, the discharge between the lead wires is divided and the divided discharges are maintained. Therefore, the electric field intensity between the lead wires required for the above can be increased, and as a result, the discharge between the lead wires can be extinguished, and the generation of heat from the lead wires can be suppressed.

According to the eighth aspect of the present invention, since the notch is provided at the end of the partition plate, when a discharge is generated between the lead wires and the lead wire is melted and shortened by the heat of the discharge, the discharge is stopped. By inducing the notch, the magnetic flux generated by the discharge causes electromagnetic field to act on the discharge by the magnetic field formed through the partition plate, and the discharge can be drawn into the partition plate, thereby dividing the discharge between the lead wires. As a result, the electric field strength required to maintain each of the divided discharges can be increased, and the discharge between the lead wires can be extinguished to suppress the generation of heat from the lead wires.

According to a ninth aspect of the present invention, since the fluorescent lamp according to any one of the first to eighth aspects is provided with a high-frequency lighting circuit for lighting by applying a high-frequency alternating voltage, the filament electrode of the fluorescent lamp is disconnected. Even if the high-frequency lighting circuit raises the voltage between the lead wires to generate a discharge between the lead wires, the arc extinguishing means extinguishes the discharge, thereby suppressing the generation of heat from the lead wires and reducing the size of the base. Thermal degradation can be prevented.

[Brief description of the drawings]

FIG. 1A is a top cross-sectional view illustrating a first embodiment, and FIG.
FIG.

FIG. 2 is a side view of a main part showing a second embodiment.

FIGS. 3A and 3B show a third embodiment, and FIG.
FIG.

FIGS. 4A and 4B show a fourth embodiment, and FIG.
Is a side view of another main part.

FIG. 5 is a schematic circuit diagram showing a fifth embodiment.

FIG. 6 is a side view of a fluorescent lamp showing a conventional example.

FIG. 7 is a side view of a main part of the above.

FIG. 8 is a side view of a main part when the filament electrode is disconnected.

FIG. 9 is a side view of the main part when the lead wire is shortened.

FIG. 10 is a side view of another essential part of the above.

[Explanation of symbols]

 2 Filament electrode 3 Lead wire 4 Base 6 Arc tube 10 Partition plate

Claims (9)

[Claims] An arc tube having a base attached to at least one end, at least one pair of filament electrodes housed inside the arc tube, one end connected to each filament electrode, and the other end connected to the outside of the arc tube. A fluorescent lamp comprising at least two or more lead wires led to a base,
A fluorescent lamp comprising an arc extinguishing means for extinguishing a discharge generated between lead wires when a filament electrode is disconnected. 2. The fluorescent lamp according to claim 1, wherein the base is a resin molded product. 3. The fluorescent lamp according to claim 1, further comprising a base for supporting the lead wire, wherein the arc-extinguishing means is a partition protruding from the base and arranged between the lead wires. . 4. The fluorescent lamp according to claim 3, wherein an occlusion substance in which a highly insulating gas is occluded is attached to the partition plate. 5. A different amount of electron emitting material is applied to each of a pair of filament electrodes, and a partition plate is provided only between lead wires connected to the filament electrode having less electron emitting material. The fluorescent lamp according to claim 3. 6. A partition plate provided between a plurality of lead wires, wherein the partition plate is made of an insulating material.
The fluorescent lamp as described. 7. A method according to claim 3, wherein a plurality of partition plates are provided between the lead wires, and the partition plate is made of a ferromagnetic material.
Fluorescent lamp according to 5 8. The fluorescent lamp according to claim 7, wherein a notch is provided at a tip of the partition plate. 9. A discharge lamp lighting device comprising a high frequency lighting circuit for applying a high frequency alternating voltage to the fluorescent lamp according to claim 1 for lighting.