JP3577521B2 - Fluorescent lamp - Google Patents

Description

これらの結果から、通常はバルブ内の排気および希ガスや水銀の封入に使用する側の排気管内径は２ｍｍ以上を必要とし、また、アマルガムを収容する側の排気管内径は１．５〜２ｍｍを必要とするところから、標準的な封止バーナ調整で鉛ガラス製の場合は外径４．７０〜５．００ｍｍ、肉厚０．６０〜０．８５ｍｍ、ソーダ石灰ガラス製の場合は外径３．７５〜４．０５ｍｍ、肉厚０．４〜０．７ｍｍのものがよい。
【００４２】
なお，本発明は上記実施例に限定されない。たとえば，上記実施例ではバルブに形成する屈曲部を二つの角部を有するＵ字形のものについて述べたが、図９（ａ）、（ｂ）に示す連続的に丸みを有するＵ字形でもあるいはＨ字形などでもよく、また、本発明は上記Ｕ字形バルブを組み合わせ接続して、鞍形や図９（ｃ）に示すＷ（Ｍ）形あるいはＵ字形バルブを３個以上接続して形成したランプに適用することも可能である。また、バルブ２、３の接続部とする部分の蛍光体膜を予め四角形状に剥がしたが、四角形状に限らず円形などできる限り小面積を剥離した方が光特性上好ましい。
【００４３】
また、実施例ではＷ（Ｍ）形バルブに２本の排気管を有し、端の１本はアマルガム収容用、他の１本はバルブ内の排気と希ガスの封入用として排気効率を上げるため中央寄りに設けたものについて述べたが、この配置に限らず図９（ｃ）に示すようにマウントが封止されるバルブの両端部にそれぞれ排気管を設け、両端から同時に排気したりまたは一方から不活性ガスを送り他方から排出して通流させるなどしてもよい。また、排気管は２本でなくても１本でもあるいは必要に応じ３本以上であっても差支えない。
【００４５】
さらにまた、実施例ではリード線としては内部リード線と封着線を接続した２パーツのもので説明したが、本発明は２パーツのものに限らず１パーツ（全体が封着線からなる。）、３パーツのものであってもよい。なお、封着線を内外のリード線とした場合は、封着線表面にガラス質や酸化膜が形成されているためこれらを剥がしてフィラメントコイルや口金の端子と接続しなくてはならない。
【００４６】
【発明の効果】
以上詳述したように本発明の蛍光ランプは、Ｕ字形ガラスバルブの接続部を形成する近傍の封止部にはリード線などの異種のものが介在せず排気管が封止されているので圧潰加工による残存歪みが少なく、接続部の形成にあたり熱加工してもこの封止部にリード線などに起因するクラックやリークの発生がない。
【００４７】
また、細管の縮径部を圧潰封止部内に設けることにより水銀アマルガムの移動が阻止されるとともに封止部外へ延出する細管の長さを短くできるので、後工程などでの取扱時に細管の折損を低減して歩留りを向上がはかれ、また、細管を短縮した分、ランプを小形化または同一長さとした場合は放電路が長くなるので発光効率を向上させることができる。
このため、接続部をバルブの端部に近い部分に形成できるので、同一のバルブを用いても放電路が長くなるので発光効率を向上させることができるとともに外観的に少々形状の劣る接続部を封止部と一緒に口金内に収容できるなど、特性、品質および歩留りの向上がはかれるコンパクト形などの蛍光ランプを提供できる。
【図面の簡単な説明】
【図１】本発明に係る鞍形のコンパクト形蛍光ランプを示す斜視図である。
【図２】図１におけるバルブ端部（圧潰封止部近傍）を拡大して示す断面正面図である。
【図３】図１におけるバルブ端部（圧潰封止部近傍）を拡大して示す断面背面図である。
【図４】図１におけるバルブ端部（圧潰封止部近傍）を拡大して示す断面側面図である。
【図５】（ａ）〜（ｅ）は本発明に係る蛍光ランプの蛍光体の塗布工程を順を追って示す説明図である。
【図６】（ａ）〜（ｅ）は本発明に係る蛍光ランプの封止工程を順を追って示す説明図である。
【図７】（ａ）〜（ｄ）は本発明に係る蛍光ランプの接続部の形成工程から排気工程までを順を追って示す説明図である。
【図８】排気管の肉厚と縮径率を対比して示す説明図である。
【図９】（ａ）〜（ｃ）は本発明に係る他の蛍光ランプバルブの形態を示す正面図である。
【図１０】従来の鞍形のコンパクト形蛍光ランプを示す斜視図である。
【符号の説明】
１：鞍形バルブ、 ２、３：Ｕ字形バルブ、 １ｒ、２ｒ、３ｒ、２３ｒ：放電路、 ２ａ、２ｂ、３ａ、３ｂ：圧潰封止部、 ４：ビードマウント、 ５１、５２：排気管（細管）、 縮径部：５ｃ、 ６：蛍光体膜、[0001]
[Industrial applications]
The present invention relates to a compact type in which a plurality of U-shaped glass bulbs are connected in close proximity to form one meandering discharge path.Such as fluorescent lampsRelated to fluorescent lamps.
[0002]
[Prior art]
Recently, many fluorescent lamps having excellent luminous efficiency and long life have been used in place of incandescent lamps. When a fluorescent lamp is used as an alternative light source for an incandescent lamp, it is advantageous to further increase the light efficiency by downsizing the lamp. For this reason, a U-shaped, H-shaped, meandering or saddle-shaped fluorescent lamp is used instead of a straight tube fluorescent lamp. A fluorescent lamp called a compact type having a bent discharge path such as a shape has been developed and is on the market.
[0003]
And usually, except for a U-shaped fluorescent lamp in which an electrode mount is sealed at both ends of a glass bulb and a fluorescent lamp in which one long glass bulb is bent at several places, it is basically formed in a U-shape. A fluorescent lamp bent by connecting two glass bulbs facing each other is obtained.
[0004]
The sealing between the glass bulb end formed in this U-shape and the electrode mount is performed by interposing a mount made of a flare stem in the opening at both ends of the glass bulb, and rotating the bulb and the mount coaxially, thereby forming both ends of the bulb. Are heated by the same burner to seal both ends simultaneously. At this time, since one end of the bulb only needs to be hermetically closed, the mount uses a ready-made flare stem that does not have a filament coil constituting a hot cathode.
[0005]
In the lamp using the mount with this flare stem, the sealing machine is sealed while rotating the glass bulb as described above, so the sealing machine is complicated and expensive, and even though the same stem is used, the lamp is heated by the same burner In some cases, sealing at both ends cannot be performed evenly, and one of them sometimes has an over-baked hole or cannot be completely sealed due to insufficient baking.
[0006]
For this reason, recently, a lamp has been manufactured by using a bead mount having a simple structure in which a pair of lead wires is supported by a glass bead, and performing crush sealing for easy operation.
[0007]
With this crush sealing, both ends of the bulb in a stationary state without rotating the glass bulb are heated by applying individual burners from both sides facing each other, and the two walls that have been softened and melted by the flame pressure of the burner It is pushed inward. Then, when the heating is further promoted, the wall surface is recessed to the lead wire portion on the center line of the bulb, and both wall surfaces come into contact with each other in a state of being caught by the lead wire. Therefore, when pressed by pinchers from both sides of the bulb, the bulbs are melted at the contact surface and the lead wire is embedded inside the glass. Also, at this time, the exhaust pipe is sealed together with the lead wire in one of the sealing portions, but a heat-resistant metal wire is inserted into the exhaust pipe, and after being pressed by the pincher, the metal wire is pulled out so that the exhaust pipe hole is not closed. I have to.
[0008]
The sealing of the U-shaped valve is preferably performed at the both ends at the same time in terms of work efficiency in manufacturing, and the burners for heating each end are different, but the sealing is promoted at the same time also in the crushing sealing, so that FIG. As described above, in the lamp using this type of bead mount, the filament coil F is connected between the lead wires L and L on one mount M1, while the filament coil F is connected on the other mount M2 only with the lead wires L and L. Are not connected, and when the valve B is sealed, both ends are heated with the same shape burner for the same time so as to be sealed evenly to form the sealed portions B1 and B2.
[0009]
The bulb B sealed in this way then forms a protruding portion C of glass by making a hole in the bulb wall on the side where the filament coil is not connected. Then, similarly to this bulb B, the projection C is fused and connected to another bulb B having the projection C formed therein, thereby producing a lamp having a discharge path such as a saddle type or a W (M) type. ing.
[0010]
Thus, in forming a hole C in the bulb wall of the sealing portion B2 to form the protruding portion C of the glass, it is necessary to heat and process the bulb wall in the vicinity of the portion to be drilled. However, lead wires L, L made of a metal material are buried in the sealing portion B2 even though the coefficient of thermal expansion of the sealing portion B2 is close to that of the glass of the bulb B, so that processing distortion during sealing remains. . Reheating the vicinity of the sealing portion B2 of the valve B in which the distortion remains causes cracks to be easily generated in the vicinity of the sealing portion B2. It was necessary to separate the formation position from the sealing portion B2.
[0011]
[Problems to be solved by the invention]
However, the fact that the formation position of the protruding portion C is away from the sealing portion B2 does not mean that the discharge path from one end of the U-shaped bulb B to the other end is used effectively, , And the length of the discharge path such as the saddle type or the W (M) type is shortened, and the luminous efficiency of the lamp is reduced. Further, after the lamp is completed, the portion to which the protruding portion C is connected is not covered with the phosphor film and is arranged so as to be located in the base from the appearance, which also causes a reduction in luminous efficiency. I was Furthermore, the lead wires L, L buried in the sealing portion B2 may leak, and the number of buried leads is preferably as small as possible.
[0012]
Unless the phosphor film is peeled off from the sealing portion B2 and the portion where the projecting portion C is formed, phosphor particles having a higher melting point than glass are mixed into the melted glass, and cracks may occur after molding. It is because it becomes.
[0013]
In addition, there is a U-shaped valve in which a mount made of a flare stem is sealed at one end, and the other end is formed so as to shrink and close the tip of the valve without intervening the mount, thereby sealing and closing the bulb. . However, also in this case, both ends are heated and sealed with a common burner while rotating the U-shaped valve, so that the sealing machine becomes complicated and expensive, and it is necessary to use a burner to simultaneously seal both ends. It was difficult to adjust and required skill to work, and productivity was not very good.
[0014]
The present invention has been made in view of the above circumstances, and it is possible to lengthen a discharge path to improve luminous efficiency and crack or leak a bulb.Or there is little risk of breakage of the thin tube.The aim is to provide a compact fluorescent lamp.
[0015]
[Means for Solving the Problems]
The fluorescent lamp according to claim 1 of the present invention has a crush seal portion at an end.Was formed and electrodes were provided inside.Glass bulbAnd a thin tube sealed in the crushable sealing portion, and amalgam stored in the thin tube.At
The capillary isCrush sealFormed with a smaller diameter than the outer part of the crushed seal that contains amalgam in the inner partIt is characterized by being.
[0016]
The fluorescent lamp according to claim 2 of the present invention is a glass bulb.When the end is crushed, the finetubePart has reduced diameter partFormedToIt is characterized by:
[0019]
[Action]
According to the first aspect of the invention, the crushable sealing portionOutside detailstubeThe amalgam housed inside is prevented from moving inside the reduced-diameter crushed sealing portion, preventing it from entering the glass bulb and sealing compared to forming a small-diameter portion on the narrow tube outside the crushed sealing portion. Reduce the length of the thin tube extending outsideit can.
According to the invention described in claim 2,A reduced diameter portion is formed at the narrow tube portion inside the sealing portion at the same time as forming the crushed sealing portion without special workit can.
[0020]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
1 is a perspective view of a saddle-shaped fluorescent lamp bulb viewed from obliquely above, FIG. 2 is a cross-sectional front view of one U-shaped glass bulb of FIG. 1, and FIG. 3 is a cross-sectional front view of the other U-shaped glass bulb of FIG. 4 shows a side view of FIG.
[0022]
In the figure, reference numeral 1 denotes a saddle-shaped bulb, which is formed by connecting a pair of U-shaped glass bulbs 2 and 3 which are formed by bending a central portion of a glass tube made of soda-lime glass or lead glass. Accordingly, this bulb 1 forms one meandering discharge path 1r by connecting one U-shaped glass bulb 2, the other U-shaped glass bulb 3 and each of the discharge paths 2r, 3r, 23r inside the connecting portion 23. are doing.
[0023]
Both ends of the U-shaped glass bulbs 2 and 3 are crushed and hermetically sealed, and the crushed sealing portions 2a and 2b and the crushed sealing portions 3a and 3b are crushed in the same direction. Surface. The bead mount 4 and an exhaust pipe 51 made of soda lime glass, lead glass, or the like are provided in the crushed sealing portion 2a, the bead mount 4 is provided in the sealing portion 3a, and the same material as described above is provided in the sealing portion 3b. The tubes 52 are respectively sealed, and there is no other than glass of the bulb 2 in the sealing portion 2b.
[0024]
The connecting portions 23 of both U-shaped glass bulbs 2 and 3 are formed by opening holes 23a and 23b near the sealing portion 2b and near the sealing portion 3b, projecting the glass, and connecting the projecting portions. It is. Reference numeral 6 denotes a phosphor film formed on the inner surface of the bulb 1. In the vicinity of the sealing portions 2a, 2b, 3a, and 3b, particularly, as described above, the phosphor particles do not enter the glass so that cracks do not occur. The sealing portions 2b and 3b are slightly longer for forming the connection portions, and have the non-formed portions 61 and 62 of the phosphor film 6.
[0025]
The bead mount 4 has a sealing wire 4b and an external lead wire 4c made of a nickel-iron alloy or an internal lead wire 4a nickel-plated with iron, a dumet wire having good air-tight sealing with glass, or a nickel-plated dumet wire. Using two lead wires connected as a lead, the internal lead wire 4a is buried in a glass bead 4d made of lead glass to support the lead wires 4a and 4a, and a coil-shaped wire is formed between the internal lead wires 4a and 4a. It is formed by connecting the filament electrode 4e. Then, the crushed sealing portions 2a and 3 of the valves 2 and 3aThe sealing wire 4b is hermetically sealed with the internal lead wire 4a embedded therein for a length of 0.5 mm or more.
[0026]
Although there are two exhaust pipes 51 and 52, the mercury amalgam 5d is provided in the exhaust pipe 51 on the side of the sealing portion 2a through a recess 5c.ButThe exhaust pipe 52 on the side of the sealing portion 3a is exhausted from the valve 1, sealed with a rare gas, and then sealed. 5a and 5b are exhaust passages.
[0027]
In the fluorescent lamp having such a configuration, up to the vicinity of each of the sealing portions 2a, 2b, 3a, and 3b is housed in a base and joined via an adhesive because of maintaining the bonding strength, electrical connection, and appearance. However, according to the present invention, the sealing portions 2b and 3b of the U-shaped glass bulbs 2 and 3 do not have a different kind such as a lead wire, and the sealing portion 3b is sealed by an exhaust pipe 52 made of the same material as the bulb 3. Since the connection portions 23 are formed near the ends of the bulbs 2 and 3 even when the connection portions 23 are formed near the ends of the valves 2 and 3, cracks and leaks caused by the lead wires are generated in the sealing portions 2b and 3b. There is no.
Further, the mercury amalgam 5d accommodated in the exhaust pipe 51 outside the crushable sealing portion 2a is prevented from moving inward of the glass bulb 2 by the reduced diameter portion 5c, thereby preventing the mercury amalgam 5 from entering the glass bulb 2 and crushing and sealing. Since the length of the exhaust pipe 51 extending outside the sealing portion 2a can be reduced as compared with the case where the diameter is reduced in the exhaust pipe portion outside the stop portion, the exhaust pipe 51 can be used at the time of handling in a later process such as a base attaching process. However, it is possible to improve the yield by reducing the breakage and to reduce the breakage, and to shorten the exhaust pipe 51. Therefore, when the lamp is downsized or has the same length, the discharge path can be lengthened.
In addition, since the connecting portion 23 can be formed near the ends of the bulbs 2 and 3, even if the same bulbs 2 and 3 are used, the discharge path becomes longer, so that the luminous efficiency can be improved.
[0028]
Next, the manufacturing process of this saddle-shaped fluorescent lamp will be described step by step as shown in FIGS. 5 (a) to 7 (n).
[0029]
FIGS. 5 (a) to 5 (e) show a process of applying a phosphor to a bent bulb. First, a bulb 2 (3) having a glass tube bent in a U-shape is prepared, and the phosphor liquid 6a with its open end facing upward. Until about 7 minutes. (Figure a)
When the two-leg discharge paths 2c and 2d (3c and 3d) of the bulb 2 (3) are on the same plane and the valve 2 (3) is inclined in a direction perpendicular to the plane, the two-leg discharge paths 2c 2d (3c, 3d), the phosphor liquid 6a starts to spill from the open ends (FIGS. B and c), and furthermore, if the valve 2 (3) is tilted and rotated so that the open end is directed downward, the phosphor liquid 6a will be in the two leg portions. The flow also flows near the open ends of the discharge paths 2c, 2d (3c, 3d), that is, the phosphor liquid 6a is applied to the entire surface of the bulb 2 (3). (Figure d)
Next, with the opening end side of the bulb 2 (3) facing downward, the phosphor coating solution 6a is baked to form a phosphor coating 6 by passing through a baking oven, and the fluorescent light at the opening end which becomes an obstacle at the time of sealing is formed. The body coating is peeled off to obtain the fluorescent film 6 forming valve 2 (3) provided with the non-formed portion 61. In addition, a non-formed portion 62 is provided in the one leg discharge path 2d (3d), which is continuous with the non-formed portion 61 and a part of which is further peeled off. (The side surface is the opposite side in the leg discharge path 3d.) (FIG. E)
6 (a) to 6 (e) show a sealing step. In FIGS. 6 (b) to 6 (e), the upper side shows a step on the valve 2 side, and the lower side shows a step on the other valve 3 side. Although the specific structure of the body is different, the operation is the same, and therefore the description will be mainly made mainly on the valve 2 side.
[0030]
A bead mount 4 and an exhaust pipe 51 are prepared on the leg discharge path 2c side of the bulb 2 bent in a U-shape, and nothing is prepared on the leg discharge path 2d side. (Figure b)
(Bead mount 4 is prepared on the leg discharge path 3c side of the other bulb 3 and exhaust pipe 52 is prepared on the leg discharge path 3d side (FIG. B)).
The bead mount 4 and the exhaust pipe 5a are interposed at the open end of the leg discharge path 2c (FIG. C), and nothing is placed at the open end of the leg discharge path 2d, and the bulb 2 is not rotated. The two open ends in the stationary state are melted by heating with separate burners 71, 71 from opposite side surfaces. (Figure d)
Both wall surfaces softened and melted by this heating are pushed inward by the frame pressure of the burners 71, 71. When the heating is further promoted, the wall surface on the side of the leg discharge path 2c becomes a lead wire on the center line of the bulb 2.Sealing lines 4b, 4bAnd dent up to the exhaust pipe 51Sealing lines 4b, 4bThe two wall surfaces come into contact with each other in such a manner as to be caught by the exhaust pipe 51. In addition, the wall surface on the side of the leg discharge path 2d is recessed to the center of the bulb 2, and the wall surfaces contact each other. At this time, the heating power of each burner 71 is adjusted so that both open ends are melted in the same time at substantially the same time. Therefore, when the melted portion is pressed by the pinchers 8 from both sides, the melted portions are mixed at the contact surface, and the sealing wires 4b, 4b of the lead wires are embedded in the glass on the leg discharge path 2c side. A sealing portion 2a is formed on the side of the leg portion discharge path 2d, and a sealing portion 2b formed by crushing the glass is formed on the leg portion discharge path 2d side. (Figure e)
In addition, this sealing must be heated so that the outside of the exhaust pipe 51 is melted, and it is necessary to increase the heat of the burners 71, 71 on the leg discharge path 2c side from the leg discharge path 2d side. There is. Also, if a concave portion is formed by applying a burner to the intermediate portion of the exhaust pipe 51 during the sealing operation, the concave portion is formed with the reduced diameter portion 5c in the sealing portion 2a as shown in FIG. Become. Further, since the bulb 3 has inclusions in the discharge passages 3c and 3d of the two legs, it is sufficient to use the same thermal power. (Figure e)
In addition, as for the lead wire portion embedded in the crushed sealing portions 2a and 3b at the time of this sealing, it is needless to say that the sealing wire 4b portion that is familiar with glass is hermetically sealed. It is preferable that the inner lead wire 4a welded to the wire 4b has a length of 0.5 mm or more and a length less than or equal to 50% of the height of the crush sealing portions 2a, 3a.
This is because if the sealing wire 4b is exposed outside the sealing portions 2a and 3b, the load of the inner lead wire 4a which is larger in diameter and heavier than the sealing wire 4b is applied to the sealing wire 4b and the vibration is caused. Lead wire 4a bends due to shock or impactCoiledfilamentelectrode4e may be deformed or disconnected to obtain predetermined characteristics, or in the case of a dumet wire, an impure gas may be generated from the surface coating to increase the discharge starting voltage, to quickly blacken, and to shorten the life. It may cause deterioration in quality such as loss of quality. Conversely, if the internal lead wire 4a is too deeply buried, the difference in thermal expansion coefficient from glass is so large that it does not fit well, so that cracks and leaks occur in the sealing portions 2a and 3b, and the yield decreases.
[0031]
In this crushing sealing, a non-oxidizing gas such as nitrogen is introduced at a pressure of about 500 mAq from the exhaust pipe 51 (52) on the side of the leg discharge path 2c (3d), so that the non-oxidizing gas flows on the side of the leg discharge path 2d (3c). The gas is discharged from the opening end, and the holes 5a (5b) of the exhaust pipes 51 (52) are crushed, so that the exhaust becomes impossible (the amalgam contained in the exhaust pipes 52 does not function). And the oxidation of the phosphor film 6 and the removal of impurity gases such as water vapor adsorbed by the bulb 2 (3) and the phosphor film 6. Then, when the mount 4 is sealed, the pressure of nitrogen is increased to about 2000 mAq to extend the glass wall of the sealing portion, and the sealing portions 2a and 2b (3a to 3b) are formed. By flowing the non-oxidizing gas in this way, the impurity gas in the bulb 2 (3) is removed, so that the lamp is quickly blackened, the starting voltage is increased, and the adhesion of mercury to the inner wall of the bulb 2 (3) is prevented. Is peeled off.
[0032]
7 (a) to 7 (d) show the steps from the step of forming the connection portion to the exhaust step. In FIG. 7 (b), the upper side shows the steps on the valve 2 side, and the lower side shows the steps on the other valve 3 side.
[0033]
The bulb 2 having both ends sealed as described above heats the non-formed portion 62 without the phosphor coating 6 adjacent to the crushed sealing portion 2b. Then, when the heating portion is softened and melted, a high-pressure gas such as nitrogen gas, for example, nitrogen gas is blown into the valve 2 from the exhaust pipe 51. When the internal pressure increases, the softened molten portion blows out, and the protruding hole 23a is formed. It is formed. (The upper side of FIG. A) (In FIG. A, the left side is a rear view, and the right side is a side view.) Also, as for the bulb 3, the non-formed portion 62 without the phosphor coating 6 is heated in the same manner as above, and the same as above. A protruding hole 23b is formed. Next, the protruding holes 23a and 23b of the valves 2 and 3 are opposed to each other, and these protruding portions are heated by the burners 72 and 72. (Figure b)
By this heating, the two protruding portions 23a and 23b are fused to form the connecting portion 23, and the two bulbs 2 and 3 are integrated to form the saddle-shaped bulb 1 having one meandering discharge path 1r. (Figure c)
The saddle-shaped valve 1 integrated in this manner accommodates the amalgam 5d in the exhaust pipe 51 of the sealing portion 2a and seals the tip. The amalgam 5d does not fall out of the space formed by the sealed portion and the previously formed reduced diameter portion 5c. Next, an exhaust pipe 52 provided in the sealing portion 3b of the valve 1 is connected to an exhaust device, the inside is evacuated, a predetermined impurity gas is released, and then a rare gas and mercury as needed are filled. The exhaust pipe 52 is sealed. (Figure d)
Then, a base (not shown) is covered so as to cover the sealing portions 2a, 2b, 3a, 3b, and the lamp is completed by attaching the base with an adhesive or the like.
[0034]
As described above, the manufacture of this fluorescent lamp can be performed without greatly changing the conventional manufacturing process. In particular, in the crushing sealing process, since there is no foreign material such as a lead wire in one sealing portion, adjustment of a heating burner or the like is performed. Also, it is possible to prevent the occurrence of cracks and leaks caused by the lead wires and the like. Further, when the exhaust pipe is interposed in the sealing portion, if the exhaust pipe is made of substantially the same material, it can be fused without any problem and no crack is generated.
[0035]
Usually, soda lime glass or lead glass is used as the material for the bulbs and exhaust pipes of these fluorescent lamps, and the same or different materials are used in combination. Sometimes, if the valve is melted at the same time as the valve, the exhaust hole is deformed and the diameter is reduced or crushed. Therefore, in the related art, a metal rod whose surface is oxidized is interposed in an exhaust pipe when pressing with a pincher, and after the pressing, the metal rod is pulled out so that an exhaust hole remains.
[0036]
However, putting a metal rod in and out of the exhaust pipe each time complicates the mechanism of the device and attaches glass, so the exhaust pipe must be cooled to some extent before the metal rod can be pulled out and it takes time to work. There was a defect.
[0037]
Therefore, it has been found that during the crushing sealing operation as in the above-described embodiment, it is only necessary to flow gas through the exhaust pipe to prevent the crushing. Note that this collapse is related to the diameter and thickness of the exhaust pipe, and the following has been confirmed in experiments by the inventors.
[0038]
First, in a bulb made of lead glass and having an outer diameter of 17.5 mm, an outer diameter made of lead glass and soda-lime glass was 4.85 ± 0.15 mm, and the thickness was 1.0 mm, 0.7 mm and 0.5 mm. And a bead mount was heated, crushed and sealed with a standard burner flame for the same time.
[0039]
As a result, as shown in FIG. 8, the inner diameter of the exhaust pipe in the sealing portion was smaller as the wall thickness was smaller than at the beginning. FIG. 8 shows the exhaust pipe wall thickness (mm) on the horizontal axis and the reduction ratio (%) of the exhaust pipe inner diameter on the vertical axis.
[0040]
From FIG. 8, the reason why the soda-lime glass exhaust pipe is smaller in diameter than the lead glass even with the same diameter is that the melting point is about 610 ° C. for lead glass and about 695 ° C. for soda-lime glass because of the difference in melting point. The exhaust pipe made of soda-lime glass can have a smaller diameter.
[0041]
In addition, Table 1 shows the results of observations on breakage, leakage, and reduction in the inner diameter of the exhaust pipe due to the relationship between the outer diameter of the exhaust pipe and the wall thickness. The test was carried out using an exhaust pipe made of lead glass having an outer diameter of 4.85 ± 0.15 mm and an exhaust pipe made of soda-lime glass having an outer diameter of 3.9 ± 0.15 mm, and sealing the lamp as described above. Five of each were fabricated and tested.
[Table 1]

From these results, the inner diameter of the exhaust pipe on the side normally used for exhausting the inside of the valve and charging rare gas or mercury requires 2 mm or more, and the inner diameter of the exhaust pipe on the side containing amalgam is 1.5 to 2 mm. Is required, the outer diameter is 4.70 to 5.00 mm, the wall thickness is 0.60 to 0.85 mm in the case of lead glass, and the outer diameter is in the case of soda lime glass by standard sealing burner adjustment. Those having a thickness of 3.75 to 4.05 mm and a thickness of 0.4 to 0.7 mm are preferable.
[0042]
The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the bent portion formed in the valve has been described as having a U-shape having two corners. However, a continuously rounded U-shape or an H-shape shown in FIGS. The present invention may be a lamp formed by connecting and connecting the above-mentioned U-shaped bulbs, and connecting three or more saddle-shaped or W (M) -shaped or U-shaped bulbs shown in FIG. 9 (c).It is also possible to apply to. In addition, although the phosphor film at the connection portion of the bulbs 2 and 3 is peeled off in a rectangular shape in advance, it is preferable from the viewpoint of optical characteristics that the area of the phosphor film is not limited to a square shape but is as small as possible.
[0043]
Further, in the embodiment, the W (M) valve has two exhaust pipes, one at the end for accommodating amalgam, and the other at the end to exhaust gas in the valve and enclose rare gas to increase exhaust efficiency. Therefore, the arrangement provided near the center has been described. However, the present invention is not limited to this arrangement, and exhaust pipes are provided at both ends of the valve whose mount is sealed as shown in FIG. An inert gas may be sent from one side and discharged from the other side to flow. In addition, the number of exhaust pipes may be one, or two or more, if necessary.
[0045]
Furthermore, in the embodiment, the description has been made of the two-part lead wire in which the internal lead wire and the sealing wire are connected. However, the present invention is not limited to the two-piece type, but one part (the whole consists of a sealing wire). ) It may be three parts. When the sealing wire is an inner or outer lead wire, since a vitreous or oxide film is formed on the surface of the sealing wire, these must be peeled off and connected to a filament coil or a terminal of a base.
[0046]
【The invention's effect】
As described in detail above, in the fluorescent lamp of the present invention, a different kind of lead wire or the like is interposed in the sealing portion near the connection portion of the U-shaped glass bulb.The exhaust pipe is sealed withoutTherefore, there is little residual distortion due to the crushing process, and even if heat processing is performed in forming the connection portion, cracks and leaks due to lead wires and the like do not occur in the sealing portion.
[0047]
Also, by providing the reduced diameter portion of the thin tube in the crushed sealing portion, the movement of the mercury amalgam is prevented, and the length of the thin tube extending outside the sealing portion can be shortened. In addition, the yield is improved by reducing the breakage of the lamp, and when the lamp is miniaturized or made the same length by the shortened capillary, the discharge path becomes longer, so that the luminous efficiency can be improved.
For this reason, since the connection portion can be formed at a portion near the end of the bulb, the discharge path becomes longer even when the same bulb is used, so that the luminous efficiency can be improved, and the connection portion having a slightly inferior shape in appearance can be obtained. Compact type with improved characteristics, quality and yield, such as being able to be housed in the base together with the sealing partSuch asA fluorescent lamp can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating a saddle-shaped compact fluorescent lamp according to the present invention.
FIG. 2 is an enlarged sectional front view showing a valve end portion (near a crush sealing portion) in FIG.
FIG. 3 is an enlarged cross-sectional rear view showing a valve end portion (near a crush sealing portion) in FIG. 1;
FIG. 4 is an enlarged sectional side view showing a valve end portion (near a crush sealing portion) in FIG. 1;
5 (a) to 5 (e) are explanatory diagrams showing the application steps of the phosphor of the fluorescent lamp according to the present invention in order.
6 (a) to 6 (e) are explanatory views showing the sealing step of the fluorescent lamp according to the present invention in order.
FIGS. 7A to 7D are explanatory diagrams sequentially showing a process of forming a connection portion of a fluorescent lamp according to the present invention and a process of exhausting the fluorescent lamp.
FIG. 8 is an explanatory diagram showing a comparison between the thickness of the exhaust pipe and the diameter reduction ratio.
FIGS. 9A to 9C are front views showing another embodiment of the fluorescent lamp bulb according to the present invention.
FIG. 10 is a perspective view showing a conventional saddle-shaped compact fluorescent lamp.
[Explanation of symbols]
1: saddle-shaped valve, 2, 3: U-shaped valve, 1r, 2r, 3r, 23r: discharge path, 2a, 2b, 3a, 3b: crush sealing portion, 4: bead mount, 51, 52: exhaust pipe(Narrow tube),Reduced diameter part: 5c,    6: phosphor film,

Claims (2)

In a fluorescent lamp having a glass bulb in which an electrode is provided inside while a crushed sealing portion is formed at an end portion, a thin tube sealed in the crushed sealing portion, and amalgam contained in the thin tube . ,
The fluorescent lamp according to claim 1, wherein the narrow tube has a reduced diameter portion formed in an inner portion of the crushed sealing portion with a smaller diameter than an outer portion of the crushed sealing portion containing amalgam . During crushing of the glass bulb end, the fluorescent lamp according to claim 1, characterized in that the reduced diameter portion is Ru is formed to a fine tube part of the pinch seal portion.

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