JP2005190844A - Fluorescent lamps and lighting fixtures - Google Patents

Abstract

[Purpose] Even if the scattered matter continuously adheres to the stem between a pair of lead wires and the abnormal discharge continues due to a short circuit between the pair of lead wires, the translucent discharge vessel melts and breaks. It is in providing the fluorescent lamp which can suppress this.
The valve inner diameter (a) and flare tube outer diameter (b) are b / a> 0.65 or more, and the length from the valve end to the electrode stem end is 20 mm or more. Even if heat is generated at the end stage and the stem is melted, heat conduction from the melted stem to the base side can be reduced, and breakage and melting of the lamp can be suppressed.
[Selection] Figure 1

Description

  The present invention relates to a fluorescent lamp and a luminaire that particularly suppress damage to the lamp end when abnormal discharge continues at the end of the life of a fluorescent lamp that is lit at high frequency.

  In general, when a fluorescent lamp equipped with a hot cathode is turned on for a long period of time, a substance such as tungsten constituting the filament, an electron emitting substance such as barium oxide applied thereto, and nickel constituting an introduction line close to the filament are introduced. The wire tip member is scattered and worn out. These scattered matter adheres to the valve wall and causes blackening, and also adheres to and accumulates on the distal end surface of the stem close to the filament. In particular, in the case of high-frequency lighting, since a relatively high voltage is applied, the lamp may cause a half-wave discharge after the electron emission material of the filament is scattered at the end of the lamp life. When such an abnormal discharge occurs, the scattering of the filament material and the material of the lead-in wire becomes more intense, and these are likely to adhere to the tip surface of the flare stem close to the filament.

  Since such a deposit is a conductor, there is a possibility that an energization path will be formed if it is deposited to some extent. In other words, if scattered electrode or the like is deposited on the front end surface of the sealing portion that seals the pair of lead wires such as the flare stem, the scattered matter forms a conductive path between the pair of lead wires.

  In general, when the filament breaks at the end of the life, the fluorescent lamp lighting device is configured to stop oscillation, but as described above, the pair of lead wires are connected (short-circuited) by the conductive path of the deposit due to the scattered matter. If the filament is broken, the lighting device may continue to operate. For example, a fluorescent lamp lighting device is a so-called capacitor preheating method in which a preheating capacitor is connected between the non-power supply side terminals of a pair of filaments. Oscillation stops because feedback control is not performed. However, if a conductive path is formed between the pair of lead-in lines due to scattered deposits, a current flows through the conductive path even if the filament is disconnected, so feedback control is maintained, and the lighting device Continues to oscillate. In this case, since one broken filament of the fluorescent lamp does not act as a hot cathode, so-called half wave discharge is repeated, and lighting by abnormal discharge is continued. In addition, the abnormal discharge generates heat in the conductive path, causing the flare stem to be damaged by heat, or causing an excessive current to flow in the conductive path, resulting in a large power loss.

In general, when the electron emitting material is completely scattered from the filament and depleted, it becomes inconvenient, but when the inverter is lit, the secondary voltage is high, so even after the electron emitting material is completely scattered and depleted. In this case, a current flows through the conductive path formed between the pair of lead wires, the conductive path generates heat, and the flare stem is damaged or excessively large. Current can flow and cause significant power loss. In view of this, a technique for preventing a short circuit between a pair of lead wires caused by such a discharge radiation material has been proposed (see, for example, Patent Document 1).
JP 2000-260393 A

  The fluorescent lamp of Patent Document 1 has a non-conductive heat-resistant surface on the stem surface that seals a pair of lead wires that hold the electrode even when the temperature of the electrode part rises and the temperature of the electrode part rises at the end of life. It is covered with a functional material. However, even if the stem surface made of glass is covered with a heat-resistant material, the temperature of the electrode part continues to rise, and when the stem begins to melt, the structure of the heat-resistant material coating is destroyed, and the stem melting action is suppressed. Is not sufficient and can cause lamp damage problems.

  The object of the present invention has been made in view of such circumstances, and the object is accompanied by a short circuit between the pair of introduction lines due to the continuous adhering of scattered matter on the stem between the pair of introduction lines. An object of the present invention is to provide a fluorescent lamp capable of preventing the translucent discharge vessel from being melted and broken even if the abnormal discharge is continued.

  The fluorescent lamp according to claim 1, wherein a discharge medium is sealed inside, a bulb having an inner surface coated with a phosphor, a pair of lead wires supporting both ends of the filament electrode, and the lead wires are sealed. A mount having a stem and sealed at least at one end of the bulb; and an insertion hole for inserting the bulb end continuous with the internal space is formed, and is electrically connected to a wire led out from the electrode A base having a base pin, and b / a> 0.65 or more when the valve inner diameter is a flare tube outer diameter b and the length from the valve end to the electrode stem end The thickness is 20 mm or more.

  The bulb is made of, for example, a quartz glass bulb, and includes a phosphor layer formed on the inner surface side of the glass bulb and a discharge medium sealed in the glass bulb. However, the bulb may be translucent ceramic or the like in addition to quartz glass. In particular, the present invention is effective in the case of a material that is easily melted or damaged due to abnormal heat generation at the end of the life of a fluorescent lamp.

  The discharge medium is generally made of, for example, an inert gas such as argon, neon, krypton, or xenon as a rare gas and mercury, but is not limited to this in the present invention.

  The shape of the valve can be any shape. For example, a straight pipe, a U shape, a W shape, a spiral shape, and the like are allowed.

  The pair of lead-in wires is formed of a wire mainly composed of nickel or iron. Of these lead wires, lead wires present in the bulb have an extremely low electrical resistance and a small resistance difference from the filament. Filaments are stretched and supported on the inner ends of these lead wires. Furthermore, the lead-in wire is sealed at both ends of the valve using a stem, a pinch seal, a bead glass, or the like, but the lead-line sealing member and the sealing method are not particularly limited. In short, any method may be used as long as the lead-in wire is sealed so as to form an electrode inside the bulb and a sealed end is formed between the pair of lead-in wires.

  The electrode is preferably made of tungsten, which is a high-melting-point material that is made of a filament, has conductivity enough to cause discharge, and does not easily deform due to heat generated by the discharge. The shape is preferably formed in a coil shape, and may be a single-winding coil, a double-winding coil, or a multiple-winding coil. The filament is coated with an emitter such as barium oxide, strontium oxide, or calcium oxide.

  The flare tube outer diameter refers to the length in the longitudinal direction of the sealed portion sealing the pair of lead wires that hold the filament coil. Note that if the flare tube outer diameter and the valve inner diameter are too close, the filament supported by the pair of lead wires, the pair of lead wires, etc. may become shadowed, and the outer end of the valve may be in the manufacturing process. When sealing the flare stem, the lead-in wire or filament electrode may come into contact with the inner wall of the bulb and rub the phosphor. On the other hand, if the interval is too wide, when an abnormal discharge at the end of the life occurs, it becomes easier to conduct through the electron emitting material deposited between the pair of lead wires, or the sealing portion of the lead wires becomes hot, The stem glass can easily melt and break. Therefore, when the bulb inner diameter is a and the flare tube outer diameter is b, b / a> 0.65, and in the range of 0.6 to 0.84, melting failure of the fluorescent lamp can be suppressed. There is a preferred range of 0.65 to 0.7.

  According to the fluorescent lamp of claim 1, the bulb inner diameter (a) and the flare tube outer diameter (b) are b / a> 0.65 or more, and the length from the bulb end to the electrode side stem end is Since it is 20 mm or more, even if the vicinity of the electrode abnormally generates heat at the end of its life and the stem starts to melt, the breakage and melting speed of the lamp can be reduced and the lamp melting and breaking can be suppressed.

  According to a second aspect of the present invention, at least one of the pair of lead wires that support the filament electrode of the fluorescent lamp according to the first aspect is provided with an insulating coating made of a flame-retardant material. It is characterized by forming.

  Since the insulating coating made of a flame retardant material that covers at least one of the pair of lead wires prevents the pair of lead wires from contacting each other, one of the pair of lead wires The side and each lead wire may be covered. Furthermore, the insulating coating may cover all of the lead wires extending from the end of the bulb, but may be partially provided if the lead wires do not contact each other. Further, since the insulating coating covering the lead wire is disposed in the vicinity of the flare stem, it is exposed to a high temperature condition at the time of abnormal heating at the end of the life, and there is a possibility that the insulating coating may catch fire due to the thermal effect. Therefore, the insulating coating must be flame retardant. In addition, although it is desirable that it is an insulating coating of a flame retardant material, the member which coat | covers a lead wire is good also as a separate member for an insulating coating and a flame retardant.

  According to the fluorescent lamp of claim 2, even if the temperature around the electrode rises at the end of the life of the fluorescent lamp and the glass of the stem portion melts, the lead wire on at least one side of the pair of lead wires is flame retardant. Since it is covered with an insulating film made of a material, it is possible to prevent the glass from melting, and even if it ignites from the insulating film, it is possible to suppress a lamp break by misfiring and suppressing the spread of fire.

  A fluorescent lamp according to claim 3, wherein an electrode is sealed at both ends so that a bent discharge path is formed, a discharge medium is sealed inside, and a fluorescent material is applied to the inner surface; The insertion hole into which the part is inserted and the cap pin which is electrically connected to the wire led out from the electrode sealed at the valve end part, and the peripheral wall of the insertion hole into which the valve end part having the electrode is inserted The thickness is characterized by comprising: a base having a thickness not less than 1.5 times the thickness around the valve end insertion hole having no electrode.

  Insert the valve end if the thickness around the insertion hole for inserting the valve end with the electrode sealed is 1.5 times the thickness around the insertion hole for inserting the valve end without the electrode The holes may be formed so as to face the respective end portions, or may be one insertion hole into which a plurality of end portions can be inserted. In addition, it is desirable that the thickness around the insertion hole for inserting the valve end is 1.5 times or more around the insertion hole for inserting the valve end with the electrode sealed. Can be prevented from melting due to the heat effect of Kotosuji.

  According to the fluorescent lamp of claim 3, the insertion hole of the base that inserts and supports the end of the bulb that inserts and supports the end of the bulb that seals the electrode portion that reaches the end-of-life temperature is inserted. By making the thickness 1.5 times or more, lamp breakage due to melting of the die can be suppressed.

  The fluorescent lamp according to claim 4 is characterized in that the lamp output of the fluorescent lamp according to any one of claims 1 to 3 is 27 to 40 W and is lit at a high frequency.

  According to the fluorescent lamp of claim 4, even a lamp that applies a relatively high voltage for high-frequency lighting that tends to cause a half-wave discharge after the electron emission material of the filament is scattered at the end of the lamp life is melted or damaged. Can be suppressed.

  A lighting fixture according to claim 5 comprises: the fluorescent lamp according to any one of claims 1 to 4; an appliance main body to which the fluorescent lamp is mounted; and a lighting device for lighting the fluorescent lamp. It is a feature.

  According to the lighting fixture of Claim 5, the lighting fixture provided with the fluorescent lamp which has an effect | action of the invention as described in any one of Claim 1 thru | or 4 can be provided.

  According to the fluorescent lamp of claim 1, the bulb inner diameter (a) and the flare tube outer diameter (b) are b / a> 0.65 or more, and the length from the bulb end to the electrode side stem end is Since it is 20 mm or more, even if it generates heat at the end of its lifetime and the stem melts, heat conduction from the melted stem to the base side can be reduced, and breakage and melting of the lamp can be suppressed.

  According to the fluorescent lamp of claim 2, even if the temperature around the electrode rises at the end of the life of the fluorescent lamp and the glass of the stem portion melts, the lead wire on at least one side of the pair of lead wires is flame retardant. Since it is covered with an insulating film made of a material, it is possible to prevent the glass from melting, and even if it ignites from the insulating film, it is possible to suppress a lamp break by misfiring and suppressing the spread of fire.

  According to the fluorescent lamp of claim 3, the insertion hole of the base that inserts and supports the end of the bulb that inserts and supports the end of the bulb that seals the electrode portion that reaches the end-of-life temperature is inserted. By making the thickness 1.5 times or more, lamp breakage due to melting of the die can be suppressed.

  According to the fluorescent lamp of claim 4, even a lamp that applies a relatively high voltage for high-frequency lighting that tends to cause a half-wave discharge after the electron emission material of the filament is scattered at the end of the lamp life is melted or damaged. Can be suppressed.

  According to the lighting fixture of Claim 5, the lighting fixture provided with the fluorescent lamp which has an effect | action of the invention as described in any one of Claim 1 thru | or 4 can be provided.

  Hereinafter, a fluorescent lamp according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a compact fluorescent lamp, and FIG. 2 is a sectional view of an end portion of an electrode sealing portion in FIG.

  The compact fluorescent lamp has two glass bulbs with one end of a glass bulb with an outer diameter of 16 to 19 mm and an inner diameter of 15 to 18 mm with a phosphor layer 11 formed on the inner surface and the other end sealed with a flare stem 20. Are connected by a bridge 12 in the vicinity of a closed portion at one end thereof, and a rare gas such as mercury and argon is sealed therein to form an arc tube 10 having a single discharge path. A resin base 30 having an insertion hole (not shown) for inserting each end of the arc tube 10 is attached to the other end side of the arc tube 10 with a silicon adhesive or the like.

  The flare stem 20 is supported by a pair of lead wires 21 (wells) made of nickel or the like penetrating airtightly. The filament electrode 22 is configured by spanning and supporting the filament electrode 22 on the inner end portions of these lead wires 21. The filament 22 is made of a tungsten wire and is formed of a double coil or a triple coil. The filament 22 sandwiches leg portions 22a formed at both ends thereof at one end side of the introduction wire 21. The filament 22 is coated with an electron emitting material (not shown) such as barium oxide. Note that the pair of lead wires 21 that support the filament 22 is usually configured by an internal lead wire 21a, a dumet wire 21b, and an external lead wire 21c, and the dumet wire 21b is connected to the internal lead wire 21a and the external wire at the crush sealing portion of the stem 20. Each lead wire 21c is welded and connected. The other end of the lead-in wire 21 is led out of the arc tube 10, and a pair of external lead wires 21c are covered with a flame-retardant silicon tube 26, and the inner space of the base 30 located on one end side of the arc tube 10 It is fixed to the inner wall with a flame retardant adhesive and is connected to the cap pin 31. In addition, the crushing sealing part which crushes and seals the jumet line 21b of the flare stem 20, ie, the stem tube 23 outer diameter a is formed in 4-14 mm, optimally 8-11 mm.

  The flare stem 20 is mainly interposed in the stem tube portion 23 for crushing and sealing the above-described jumet wire 21b, the flare portion 24 welded to the end of the arc tube 10, the flare portion 24 inward, and the flare tube portion 23. Has a small tube 25. One end side of the thin tube 25 is arranged in the back of the flare tube portion 23, that is, in the vicinity of the crushing and sealing portion of the jumet wire 21b, and welded so as not to close one end side of the thin tube 25, and the other end side projects outward from the flare portion 24. ing. Then, the inside of the bulb is evacuated through the opening on the other end side of the narrow tube 25, and after a discharge medium such as mercury and a rare gas is sealed, the chip is turned off. The flare portion 24 sealed at the end of the arc tube 10, that is, the height b from the arc tube end to the stem tube 23 is formed to be 20 to 40 mm.

  The base 30 has a base body and four base pins 31 protruding from one end face of the base body, and forms, for example, a GY10q type for a compact fluorescent lamp.

  The entire base 30 is made of, for example, an insulating synthetic resin, and has an outer peripheral surface formed in a substantially oval shape in the longitudinal cross section, and both end surfaces are formed in a substantially flat shape. An insertion hole for inserting each end of the arc tube is formed on one end surface in the longitudinal direction, and the base 30 and the bulb are bonded and fixed by silicon resin as an adhesive.

  The compact fluorescent lamp configured in this way is scattered at the end of the life of the fluorescent lamp, such as tungsten constituting the filament electrode 22, the electron emitting material applied thereto, and nickel in the pair of lead-in wires 21 close to the filament 22. Adheres to the surface of the stem 20, the electron emitting material applied to the filament 22 at the end of the life is depleted, the vicinity of the electrode is abnormally heated by heat, the stem base portion sealing the lead-in wire is locally heated, and the stem glass Melts. However, since the distance between the stem 20 and the inner wall of the arc tube 10 and the distance between the stem 20 and the arc tube end portion are formed at predetermined intervals, the resin cap 30 that holds the arc tube 20 even if the stem glass melts. The melting can be stopped without reaching. If the wall thickness of the insertion hole for inserting the end of the arc tube sealed with the electrode 22 of the base 30 holding the arc tube 10 is increased, the temperature in the vicinity of the electrode becomes high at the end of the life, and the thermal effect is reduced to resin. Even if the base 30 receives, it is possible to reduce the melting of the base 30 easily.

  In the above embodiment, a fluorescent lamp in which one arc tube 30 is bent and connected has been described, but two glass bulbs are formed by bridge connection or three glass bulbs are connected. The same effect can be expected regardless of the number of glass bulbs to be connected and the power consumption, such as fluorescent lamps and fluorescent lamps formed by connecting four glass bulbs.

  FIG. 3 shows a second embodiment of the fluorescent lamp according to the present invention. In the fluorescent lamp according to the first embodiment described above, two arc tubes 20 configured to be bent in a U shape are used. These are configured by connecting them in a W shape by a bridge. Accordingly, the basic configuration of the base 30 is the same as that of the above-described embodiment. The base shown in FIG. 4 is made of, for example, a synthetic resin having an insulating property, and the outer peripheral surface is formed in a substantially oval shape in the longitudinal section, and both end surfaces are formed in a substantially planar shape. An insertion hole for inserting each end of the arc tube 10 is formed on one end surface in the longitudinal direction.

  The insertion hole for inserting each end is formed with an inner diameter slightly larger than the outer diameter of the arc tube 10 so that the end of the arc tube 10 can be inserted, and the base 30 and the arc tube 10 are formed by silicon resin as an adhesive. Is fixed by bonding. In addition, among the insertion holes for inserting the arc tube 10 formed in the base 30, the insertion holes formed at both ends are inserted at the ends of the arc tube 10 with the electrodes 22 sealed. The thickness is about 1.5 to 2 mm. In addition, the insertion hole into which two arc tube end portions located in the middle of the substantially bowl shape can be inserted so as to be sandwiched by the insertion hole into which the arc tube end portion sealing the electrode 22 is inserted has a thickness of 0.8 to It is formed to about 1 mm.

  In this way, the thickness of the insertion hole for inserting the end portion of the arc tube 10 having the electrode 22 is made thicker than that of the insertion hole for inserting the end portion of the arc tube 10 having no electrode. Even if the vicinity becomes high temperature, the resin base can be prevented from being deformed and melted.

  Next, the lighting fixture which is one Embodiment of this invention is demonstrated using FIG. FIG. 4 is a schematic cross-sectional view showing the illumination device of the present invention. This illumination device 40 is a ceiling-embedded lamp using two fluorescent lamps of the first embodiment. In the figure, reference numeral 41 denotes a fluorescent lamp, and 40 denotes a lighting device body.

  The illuminating device body 40 includes a base body 42, a reflecting plate 43, and a lighting device 44. The base 42 has a truncated cone shape in cross section, and a frame edge is formed on the periphery of the lower surface. The frame edge is embedded in the ceiling in a state where the frame edge is in contact with the opening of the ceiling from the lower surface. The reflection plate 43 has a V-shaped cross section and is arranged so as to divide the base 42 into two substantially. The lighting device 44 is disposed inside the reflection plate 43. Thus, two rows of elongated concave portions are formed in parallel inside the lighting device main body 40 by the base body 42 and the reflecting plate 43. Although not shown, a lamp socket is disposed at one end in the longitudinal direction of the recessed portion.

The schematic of the compact fluorescent lamp which shows 1st Embodiment. Sectional drawing of the electrode sealing part edge part of FIG. The schematic of the fluorescent lamp which shows 2nd Embodiment. The illuminating device which shows 1st Embodiment.

Explanation of symbols

10 ... arc tube, 20 ... stem, 21 ... lead-in wire, 22 ... filament electrode,
23 ... Stem tube, 24 ... Flare, 25 ... Narrow tube, 30 ... Base

Claims (5)

A bulb in which a discharge medium is enclosed and phosphor is applied on the inner surface;
A mount having a pair of lead wires for supporting both ends of the filament electrode and a stem for sealing the lead wires and sealed at least at one end of the bulb;
An insertion hole into which the valve end continuous to the internal space is inserted, and a base having a base pin electrically connected to a wire led out from the electrode;
B / a> 0.65 or more when the valve inner diameter is a and the flare tube outer diameter is b, and the length from the valve end to the electrode stem end is 20 mm or more. Fluorescent lamp characterized by 2. The fluorescent lamp according to claim 1, wherein an insulating coating made of a flame retardant material is formed on at least one of the pair of lead wires supporting the filament electrode that extends outside the bulb. A bulb in which electrodes are sealed at both ends so that a bent discharge path is formed, a discharge medium is sealed inside, and a phosphor is coated on the inner surface;
An insertion hole for inserting a valve end having an electrode, having an insertion hole into which the valve end is inserted and a cap pin for electrically connecting a wire led out from an electrode sealed at the valve end. The thickness around the hole is not less than 1.5 times the thickness around the valve end insertion hole without electrode;
Fluorescent lamp characterized by comprising The fluorescent lamp according to any one of claims 1 to 3, which has a lamp output of 27 to 40 W and is lit at a high frequency. A fluorescent lamp according to any one of claims 1 to 4;
An instrument body equipped with this fluorescent lamp;
A lighting device for lighting a fluorescent lamp;
The lighting fixture characterized by comprising.

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