JP2002203516A - Fluorescent lamp and fluorescent lamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent lamp and a fluorescent lamp device wherein it is prevented that a sealing member is made to be thermally damaged or that an unnecessary large current flows due to accumulation and conduction of scattering substances of an electrode on the sealing member through which an inner lead wire penetrates. SOLUTION: In the fluorescent lamp wherein a pair of the inner lead wires 3 is penetrated through a sealing end part 2 of a light emitting tube 1 and wherein the filament 4 is bridged to the inside end parts of these inner lead wires, it is characterized that a concave part 7 is formed at a position of a root of the inner lead wires or the position between the inner lead wires on the sealing member 2 through which the pair of the inner lead wires 3 is penetrated. As the concave 7 is formed on the sealing member 2, the scattering substances of the electrode become difficult to be deposited, and an electroconductive path becomes difficult to be formed between the inner lead wires 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp and a fluorescent lamp device for preventing short-circuiting between internal leads caused by scattering of filament material.

[0002]

2. Description of the Related Art Generally, in a fluorescent lamp, an end portion of an arc tube formed of a glass tube having a phosphor film formed on an inner surface thereof is closed with a flare stem, and a pair of internal leads (wells) are hermetically sealed to the flare stem. And a filament coil is wound around the inner ends of these internal leads.

[0003]

When a lamp having such a structure is operated at a high frequency for a long period of time, a filament material (W), an electron emitting material such as barium oxide applied thereto, and an internal lead wire close to the filament are used. The scattered tip member (Ni) scatters, and the scattered matter adheres to the valve wall to cause blackening, and the scattered matter also adheres to the tip end surface of the flare stem near the filament and accumulates. In particular, at the end of the lamp life, the lamp may cause a half-wave discharge after the electron-emitting material of the filament is scattered. When such a half-wave discharge occurs, the material of the filament (W) or the material of the internal lead wire (Ni ) Becomes scattered, and these are likely to adhere to the tip surface of the flare stem near the filament.

[0004] Since such deposits are conductors, they may be energized when deposited to some extent. That is, when the electrode scattering material or the like is deposited on the tip surface of the flare stem, a conductive path formed by the electrode scattering material is formed between the pair of internal lead wires which are separated from each other and sealed. Wires may be conducted to each other by the conductive path of the deposit formed on the tip surface of the flare stem.

In such a case, for example, when the preheating circuit of the filament is of a constant current control type, even after the filament is broken, a current flows through the deposition conductive path between the pair of internal leads, and the conductive path generates heat. However, there is a problem that the flare stem is damaged by heat or a large amount of current flows to cause a large power loss.

In general, when the electron emitting material is completely scattered from the filament and becomes exhausted, the lamp becomes inconsistent. However, when the inverter is turned on, the secondary voltage is high, so that the electron emitting material is completely scattered. Even after the exhaustion, the half-wave discharge may be continued, and in such a case, current flows through the conductive path of the deposit formed between the pair of internal leads, and the conductive path generates heat and generates a flare stem. May be damaged or a large amount of current may flow, resulting in a large power loss.

Accordingly, an object of the present invention is to prevent a deposition conductive path formed by an electrode material or an electron emitting material from being formed between the internal lead wires of the sealing member, thereby causing the sealing member to be thermally damaged or unnecessary. An object of the present invention is to provide a fluorescent lamp and a fluorescent lamp device capable of preventing a large current from flowing.

[0008]

According to a first aspect of the present invention, there is provided a fluorescent lamp comprising: an arc tube having a phosphor coating formed on an inner surface thereof; a pair of internal lead wires for supporting a filament penetrating therethrough; A sealing member sealed at the toe; a concave portion formed at the root of at least one of the inner leads or between the pair of inner leads on the surface of the sealing member facing the filament; And;

A fluorescent lamp according to a second aspect of the present invention is characterized in that an arc tube having a phosphor coating formed on an inner surface thereof; and a pair of internal lead wires for supporting a filament penetrate therethrough and sealed at a sealing end of the arc tube. A sealing member made of an insulating material, supported by the inner leads so as to be located between the pair of inner leads, and preventing a short circuit between the pair of inner leads by a substance scattered from the filament. And a short-circuit preventing member.

A fluorescent lamp according to a third aspect of the present invention is characterized in that an arc tube having a phosphor film formed on an inner surface thereof; and a pair of internal leads supporting a filament penetrate therethrough and sealed at a sealing end of the arc tube. A sealing member, which is provided between the pair of internal leads along the longitudinal direction of the filament so as to face the filament; A short-circuit preventing member made of an insulator attached to at least one of the pair of internal lead wires so as to prevent a short circuit between the lead wires.

According to a fourth aspect of the present invention, in the fluorescent lamp according to the second or third aspect, the short-circuit preventing member is made of ceramics.

According to a fifth aspect of the present invention, there is provided a fluorescent lamp device.
Or a lighting device for lighting the fluorescent lamp with a high-frequency power supply.

[0013]

According to the first aspect of the present invention, the inner lead wire is recessed at the root of at least one of the inner lead wires or at a position between the pair of inner lead wires of the surface of the sealing member facing the filament. Since the portion is formed, even if the substance scattered from the electrode accumulates on the surface of the sealing member of the pair of internal leads, it is difficult to deposit in the concave portion, and thus it is difficult for the conductive path to be formed, and along the surface of the sealing member. Current hardly flows between the internal lead wires.

According to the present invention, a short-circuit preventing member made of an insulating material is provided on the internal lead wire so as to prevent a short circuit between the pair of internal leads caused by the substance scattered from the filament. Because it is supported, it is difficult for electrode scattering substances to deposit on the surface of the sealing member, thereby preventing a short circuit between the pair of internal lead wires.

Further, according to the invention of claim 5, since the fluorescent lamp of each of the above-mentioned inventions is applied as a fluorescent lamp device which is operated by a high-frequency power source, a high-frequency operation type lamp in which electrode materials and the like are scattered is provided. The effect becomes remarkable.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to a first embodiment shown in FIGS. FIG. 1 is a sectional view showing an end of a straight tube fluorescent lamp, and FIG. 2 is a perspective view showing the entire straight tube fluorescent lamp. In the figure, reference numeral 1 denotes an arc tube bulb made of a glass tube. The end of the arc tube 1 is hermetically closed by a flare stem 2, and a pair of internal leads (wells) 3 made of nickel or the like are hermetically penetrated through the flare stem 2. A filament 4 is attached to the inner end of each of these internal leads 3.
Has been passed over. The filament 4 is made of a tungsten wire and is formed of a double coil or a triple coil. Legs 5 and 5 formed at both ends of the filament 4 are clamped by hooks 6 and 6 formed on the internal lead wires 3 and 3, respectively. The filament 4 is coated with an electron emitting material (not shown) such as barium oxide.

The flare stem 2 has a recess 7 at the root of at least one of the internal leads 3 corresponding to the root through which the pair of internal leads 3 penetrate. A phosphor coating 8 is provided on the inner surface of such an arc tube 1.
The arc tube 1 is filled with a predetermined amount of mercury and a rare gas such as argon. Further, caps 10 and 10 are provided at both ends of the arc tube 1, respectively.
These bases 10 are provided with base pins 11, 11 protruding therefrom. These base pins 11, 1
Reference numeral 1 is connected to the internal lead wires 3,3.

In the fluorescent lamp having such a configuration, when the lamp is turned on for a long period of time, tungsten constituting the filament 4, an electron emitting substance applied thereto, and the material of the hook portion 6 of the internal lead wire 3 close to the filament 4 are used. Nickel is scattered, and these splatters are flare stem 2
May adhere to and accumulate on the tip end surface of the substrate. Since such deposits 9 are conductors, there is a possibility that electricity will flow when deposited to some extent.

However, in the case of the first embodiment,
Since the concave portion 7 is formed on the distal end surface of the flare stem 2 at the root of at least one of the internal lead wires 3, when the electrode scattering material 9 is deposited on the distal end surface of the flare stem 2, the concave portion 7 is formed. It becomes difficult to deposit. For this reason, even if the electrode scattered substance 9 is deposited on the tip end surface of the flare stem 2, the ratio of electrical conduction between the pair of internal lead wires 3, 3 separated from each other by the deposit 9 is reduced. Short circuit is prevented.

As a result, even if the preheating circuit of the filament 4 is of a constant current control type or an inverter lighting type, for example, current is prevented from flowing between the pair of internal leads 3 and 3 Problems such as thermal damage of the flare stem 2 due to the heat generation of 9 and generation of a large power loss due to the flow of a large current can be avoided.

FIG. 3 shows a second embodiment of the present invention. In this embodiment, a concave portion 7 is formed on the front end surface of the flare stem 2 between the pair of internal lead wires 3. Even in this case, even if the electrode scattering material 9 is to be deposited on the tip end surface of the flare stem 2, it is difficult for the electrode scattering material 9 to deposit in the recessed portion 7, and the conductive material 9 is conducted between the pair of internal lead wires 3, which are separated from each other. Is reduced, and short circuiting is prevented.

FIG. 4 shows a third embodiment of the present invention. In this embodiment, the root of at least one of the internal leads 3 is surrounded by an insulating tube 30. Insulation tube 30
The insulating tube 30 may be embedded at the tip of the flare stem 2.

In such a case, even if scattered matter such as an electrode substance accumulates on the tip surface of the flare stem 2, the internal lead wire 3
Is surrounded by the insulating tube 30, the deposit 9 (see FIG. 1) is prevented from coming into contact with the lead wire 3 and the creepage distance is increased.
No mutual short circuit occurs.

FIG. 5 shows a fourth embodiment of the present invention. In this embodiment, a short-circuit preventing member for preventing a scattered substance from reaching the front end face of the flare stem 2 from the filament 4 in the middle of at least one of the internal leads 3,
For example, a flange member 40 is attached as an overhang member. The flange member 40 serving as an overhanging blocking member is made of ceramics, quartz, ordinary glass or metal, and is joined to the internal lead wire 3. In such a configuration,
Hook 6 of filament 4, coating material or lead wire
Material evaporates and attempts to scatter on the tip end surface of the flare stem 2, the scattered matter adheres to the flange member 40 provided on the way,
Therefore, deposition on the front end surface of the flare stem 2 is reduced. For this reason, the ratio of short-circuiting of the internal lead wires 3 is reduced, and it takes a long time to deposit, and the life characteristics are improved.

FIG. 6 shows a fifth embodiment of the present invention. In this embodiment, a glass rod made of ceramics, quartz, ordinary glass, or the like is used as an overhang preventing member in the middle of at least one of the internal lead wires 3. 50 are provided.

FIGS. 7 and 8 show a sixth embodiment of the present invention. In this embodiment, at least one of the internal lead wires 3 is made of glass made of ceramics, quartz, ordinary glass, or the like as an overhang preventing member. A bead 60 is provided. In this case, the glass bead 60 can be attached by the method shown in FIG. That is, FIG.
And 55, 55 are jigs, and glass balls 57, 57
And holding recesses 56, 56 for holding. Glass balls 57, 57 are fitted into the holding recesses 56, 56, and the glass balls 57, 57 are heated and softened by gas burners 58, 58 as shown in FIG. When the surfaces of the glass spheres 57 and 57 are softened, the jig 5 is moved as shown in FIG.
The lead wire 3 is sandwiched between the glass balls 57, 57 softened by bringing them closer to each other. In this state, the glass balls 57, 5
Wait for cooling and solidification of 7, and when this solidifies, jigs 55 and 55
Are separated as shown in FIG. Then, the glass spheres 57 and 57 are welded to each other and adhere to the lead wire 3 to form a glass bead 60 shown in FIG. In the case of the sixth embodiment having such a configuration, the same effect as in the case of the fourth embodiment shown in FIG. 5 can be obtained.

In each of the above embodiments, a fluorescent lamp using the flare stem 2 has been described. However, a recent fluorescent lamp may use a button stem or a bead stem in order to increase the effective light emission length. is there. When such a button stem or a bead stem is used, the lead wire passes through the button stem or the bead stem, so that the scattered matter of the electrode material accumulates on the surface of the button stem or the bead stem. Therefore, the present invention is also applicable to a fluorescent lamp using a button stem or a bead stem, and these stems are collectively referred to as a sealing member. Further, the shape of the lamp is not limited to a straight tube shape, but may be a bent shape or a rapid start type fluorescent lamp.

From the above, according to the above embodiments, it is possible to prevent the sealing member from being thermally damaged after the filament 4 is broken, or to prevent an unnecessary large current from flowing.

[0029]

According to the first aspect of the present invention, since the recessed portion is formed on the surface of the sealing member through which the internal lead wire passes, facing the filament, the electrode is provided on the surface of the sealing member of the pair of internal lead wires. Even if the scattered substance is deposited, it is difficult to deposit in the recessed portion, so that it is difficult to form a conductive path on the surface of the sealing member, thereby preventing a current from flowing between the internal leads along the surface of the sealing member.

According to the second to fourth aspects of the present invention,
A short-circuit preventing member made of an insulating material is supported on the internal lead wire so as to prevent a short circuit between the pair of internal leads caused by the substance scattered from the filament. To prevent scattered substances from reaching the surface and reduce the formation of conductive paths by deposits.

According to the invention of claim 5, since the fluorescent lamp is provided with the fluorescent lamp of claims 1 to 4 which is turned on by a high-frequency power source, the effect is remarkably exhibited, and particularly effective. is there.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an end portion of a fluorescent lamp according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing the entire fluorescent lamp of the embodiment.

FIG. 3 is a sectional view showing an end of a fluorescent lamp according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing an end of a fluorescent lamp according to a third embodiment of the present invention.

FIG. 5 is a sectional view showing an end of a fluorescent lamp according to a fourth embodiment of the present invention.

FIG. 6 is a perspective view of an electrode mount according to a fifth embodiment of the present invention.

FIG. 7 is a perspective view of an electrode mount according to a sixth embodiment of the present invention.

FIGS. 8A to 8D are views showing working steps when manufacturing the electrode mount of the sixth embodiment.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 1: arc tube bulb, 2: stem 3, internal lead wire, 4
... filament 7 ... concave part, 30 ... insulating tube 40
... short-circuit prevention member, 50 ... glass rod 60 ... glass bead.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mamoru Ikeda 4-4-2 Mita, Minato-ku, Tokyo F-term in Toshiba Lighting & Technology Corporation (reference) 5C043 AA20 CC09 CC10 CD10 DD06 DD07 DD17 DD19 EA01 EA06 EA09 EB15

Claims (5)

[Claims] An arc tube having a phosphor coating formed on an inner surface thereof; a sealing member penetrating a pair of internal leads supporting a filament and sealed at a sealing end of the arc tube;
And a recess formed at the base of at least one of the inner leads of the sealing member facing the filament or between the pair of inner leads. Fluorescent lamp. 2. An arc tube having a phosphor film formed on an inner surface thereof; a sealing member penetrating a pair of internal leads supporting a filament and sealed at a sealing end of the arc tube;
A short-circuit preventing member made of an insulating material, supported by the inner leads so as to be located between the pair of inner leads, and preventing a short circuit between the pair of inner leads by a substance scattered from the filament; A fluorescent lamp comprising: 3. An arc tube having a phosphor film formed on an inner surface thereof; and a sealing member penetrating a pair of internal leads supporting the filament and sealed at a sealing end of the arc tube.
It is provided so as to be located between the pair of internal leads along the longitudinal direction of the filament so as to face the filament, and adheres the material scattered from the filament and does not short-circuit between the pair of internal leads due to the deposited scattered material. And a short-circuit preventing member made of an insulator attached to at least one of the pair of internal leads. 4. The fluorescent lamp according to claim 2, wherein said short-circuit preventing member is made of ceramics. 5. A fluorescent lamp device, comprising: the fluorescent lamp according to claim 1; and a lighting device for lighting the fluorescent lamp with a high-frequency power supply.