JP3384451B2 - Fluorescent lamps and compact fluorescent lamps - Google Patents

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 compact fluorescent lamp.

[0002]

2. Description of the Related Art Conventionally, in a fluorescent lamp, as described in, for example, Japanese Unexamined Patent Publication No. 1-220360, a bulb having a bent discharge path formed by sequentially connecting three substantially U-shaped tubes. There is known a structure of a fluorescent lamp which is miniaturized while securing a discharge path length by forming an electrode and sealing electrodes at both ends of this bulb.

In such a fluorescent lamp, a main amalgam that controls the mercury vapor pressure in the bulb to an appropriate range during steady lighting, and mercury that adsorbs suspended mercury in the bulb when it is turned off and is adsorbed in the initial lighting stage, including the start-up period. Auxiliary amalgams that give off may be used. The main amalgam is housed in an exhaust thin tube protruding from the end of the bulb at one end of the bulb where the electrode is sealed, and the auxiliary amalgam is located at the end of the bulb in the middle of the bulb. .

However, when the main amalgam is housed in the exhaust thin tube protruding from the end where the electrode of the tubular body at one end of the valve is sealed, the temperature of the main amalgam increases due to the heat effect from the electrode. Too much, the mercury vapor pressure is not effectively suppressed, and there is a problem that the luminous flux is reduced due to excessive mercury vapor pressure. Moreover, the mercury vapor pressure on the tube side at the other end of the bulb away from the main amalgam is uniform. And there is a problem that it is difficult to stabilize.

Further, as described in Japanese Utility Model Publication No. 4-47893, the main amalgam is housed in a thin tube projecting from the end of the tubular body located in the middle of the three tubular bodies of the valve. Known fluorescent lamps are known. In this fluorescent lamp, the heat effect from the electrode on the main amalgam is reduced, the excessive rise of the temperature of the main amalgam is suppressed, and the mercury vapor pressure is kept in an appropriate range, and moreover, from the main amalgam to each end of the bulb. The distance is shortened almost uniformly so that the mercury vapor pressure inside the bulb is made uniform and stable.

However, if the main amalgam is housed in a thin tube projecting from the end of the tube located in the middle of the three tube bodies of the valve, the main amalgam will be too far from the electrodes and it will be difficult to warm up. , When the ambient temperature of the fluorescent lamp is low and the temperature of the main amalgam itself is low, such as at start-up, the temperature of the main amalgam does not quickly reach the temperature most suitable for its action, and the rate of releasing mercury is As a result, there is a problem in that the rising characteristics of the luminous flux are inferior, and it takes time to reach a stable state.

[0007]

As described above, as described in Japanese Patent Application Laid-Open No. 1-220360, the main amalgam is projected from the end of the bulb at one end of the bulb where the electrode is sealed. When housed in a thin tube for exhaust, the temperature of the main amalgam becomes too high under the influence of heat from the electrodes, and the mercury vapor pressure on the tube side at the other end of the valve away from the main amalgam becomes uniform and stable. There are difficult problems,
Further, as described in Japanese Utility Model Publication No. 4-47893, when the main amalgam is housed in a thin tube projecting from the end of the tube body located in the middle of the three tube bodies of the valve, The amalgam is too far from the electrodes and it is hard to warm up,
There is a problem that it takes time for the luminous flux to reach a stable state.

In addition, with the recent miniaturization of fluorescent lamps,
Although miniaturization of the valve is desired, it is necessary to reduce the diameter of the thin tube as the diameter of the valve decreases in the configuration in which the thin tube for exhaust is arranged at the end of the valve, but the thin tube has a certain size or less. When the diameter is reduced to 1, the exhaust conductance deteriorates and the exhaust efficiency decreases. Even if the diameter of the thin tube is not reduced, the gap between the pair of inner wells supporting the electrode is narrowed, which causes a problem that the sealing step becomes difficult.

The present invention has been made in view of the above point, and by devising the position of the thin tube of the bulb, the fluorescent lamp and the light bulb which can correspond to the position of the amalgam or the point of reducing the diameter of the bulb. An object of the present invention is to provide a fluorescent lamp.

[0010]

According to a first aspect of the present invention, there is provided a fluorescent lamp having a tube outer diameter of 8 to 11 mm, a straight tube portion and a bent portion.
Having a plurality of U-shaped pipes having a
The pipe part is arranged along the circumference and the communication pipe
Straight tube parts of the tube body so that one discharge path is formed
The maximum width in the valve arranging direction is 32 to
It is configured to be 43 mm, and the phosphor is formed on the inner surface.
Is a valve sealed gas is sealed in; position across the valves
Install a thin tube with a pinch seal at the end of the straight tube of the tube to be placed.
A pair of electrodes that are sealed without a pair ; these pair of electrodes
Straight section of the tubular body in which at least one of the electrodes is sealed
Formed on the end of the straight pipe that is closest to the
And the inner diameter of the pinch seal part is on the tube side.
Configured to be smaller than the inner diameter of the part away from
A tubule which communicates with the tube; the pinch seal portion of the narrow tube
And an amalgam enclosed in a portion farther from the tubular body than the portion .

With this structure, the outer diameter of the pipe is 8 to 11.
mm multiple U-shaped pipes are installed side by side,
Configure the valve so that the maximum width is 32 to 43 mm
Therefore, it should be miniaturized to a size equivalent to a general lighting bulb.
And the straight tube part of the tube in which the electrodes are sealed.
Form a pinch seal at the end of the straight pipe that is closest to
Since encapsulating the amalgam to form tubules, with suppress the temperature of the amalgam is too high, to help warm the amalgam during start-up. This keeps the mercury vapor pressure within a proper range and shortens the time until the luminous flux stabilizes at the time of starting. Moreover, the pinch seal part of the thin tube
The inner diameter of is smaller than the inner diameter of the part where amalgam is enclosed.
The amalgam can be securely held in the thin tube.

The fluorescent lamp according to a second aspect is the fluorescent lamp according to the first aspect, wherein one of the electrodes sealed at both ends of the bulb is a preheating side electrode and the other is a non-preheating side electrode, and the amalgam is a preheating side electrode. Is the one enclosed in the thin tube closest to.

In this structure, by enclosing the amalgam in the thin tube closest to the preheating side electrode of the valve,
The amalgam tends to warm up at startup, improving the rising characteristics of the luminous flux .

[0014] The fluorescent lamp of claim 3, wherein the claim 1 or
Or the fluorescent lamp according to 2 , having a bulb of a tube.
The auxiliary amalgam is arranged at the end portion which is not open.

In this structure, the valve thin tube is provided.
By arranging the auxiliary amalgam at the end which is not formed , the mercury vapor pressure is kept in an appropriate range and the time until the luminous flux is stabilized at the time of starting is shortened.

A fluorescent lamp according to a fourth aspect is the fluorescent lamp according to any one of the first aspect to the third aspect, in which the bulb is arranged so that each tube body corresponds to each side of the triangular section. There is something.

In this structure, the bulb is made small so that it can be applied to, for example, a compact fluorescent lamp.

According to a fifth aspect of the present invention, there is provided a self-ballasted fluorescent lamp including the fluorescent lamp according to any one of the first to fourth aspects and a lighting circuit for lighting the fluorescent lamp.

In this configuration, the first to fifth aspects are provided.
There is provided a self-ballasted fluorescent lamp having the function of the fluorescent lamp according to any one of the above.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the fluorescent lamp of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment, FIG. 1 (a) is a development view of a bulb of a fluorescent lamp, and FIG. 1 (b) is an enlarged sectional view of part A of FIG. 1 (a). 2 is a side view of the fluorescent lamp, FIG. 3 is a plan view of the globe of the fluorescent lamp seen through, and FIG. 4 is a partial sectional view of the fluorescent lamp.

In the figure, reference numeral 11 is a light bulb type fluorescent lamp (hereinafter referred to as a light bulb type fluorescent lamp). This light bulb type fluorescent lamp 11 includes a cover 13 having an E26 type base 12 and a light-transmitting globe 14. , Arc tube 15 stored in globe 14,
The lighting circuit 16 housed in the cover 13 is provided. Then, the envelope composed of the cover 13 and the globe 14 is
It has an outer shape similar to the standard size of a general lighting bulb. That is, the height H1 including the base 12 is 110 to 125.
mm, diameter, that is, the outer diameter D1 of the globe 14 is 50 to 6
The outer diameter D2 of the cover is about 0 mm and about 40 mm. The general lighting bulb is JIS C 75.
01 is defined. Then, the base 12 side will be described as the lower side and the globe 14 side as the upper side.

The cover 13 is provided with a cover body 21 made of a heat resistant synthetic resin such as polybutylene terephthalate (PBT). The cover main body 21 has a substantially cylindrical shape that expands upward, and a lower end of the cover main body 21 is covered with a mouthpiece 12 such as an E26 type, and is fixed by adhesion or caulking.

Further, the globe 14 is transparent or has a light diffusing property such as milky white, and is made of glass or synthetic resin into a smooth curved surface having substantially the same shape as the glass bulb of a general lighting bulb. The portion is fitted and fixed inside the opening at the upper end of the cover 13. The globe 14 can be combined with another member such as a diffusion film to improve the brightness uniformity.

Such a globe 14 and a valve 31 described later
By combining with, the light output emitted in the direction of the base 12 is increased, and a light distribution characteristic close to that of a general lighting bulb can be obtained.

Further, the lighting circuit 16 is a horizontal circuit board, that is, a disk-shaped circuit board arranged vertically to the longitudinal direction of the arc tube 15.
The circuit board 24 is provided with a plurality of parts (electrical parts) 25 and 26 on both sides of the circuit board 24, that is, the lower surface on the side of the base 12 and the upper surface on the side of the arc tube 15, and an inverter circuit (high frequency light) Lighting circuit) is configured.

The circuit board 24 is substantially disk-shaped, and has a diameter (maximum width dimension) of 1.2 times or less of the maximum width D3 in the direction in which the valves 31 to be described later are arranged side by side, and is formed to about 40 mm. .

Of the plurality of components 25 and 26, the component 25 such as an electrolytic capacitor or a film capacitor having a relatively low heat resistance is mounted on the lower surface of the circuit board 24, and the upper surface of the circuit board 24 is relatively heat resistant. The components 26 such as a chip-shaped REC (rectifier, rectifier, diode bridge), transistor, resistor, etc. having a thickness of about 2 to 3 mm are mounted. .

Further, the arc tube 15 has a bulb 31, a phosphor (phosphor layer) 32 is formed on the inner surface of the bulb 31, and a rare gas such as argon and mercury are filled in the bulb 31 as a filling gas. A pair of electrodes 33 that are enclosed and are located on both ends of the valve 31.
Is enclosed by a pinch seal.

The valve 31 has three pipes 34a, 34b, 34c. These pipes 34a, 34b, 34c have, for example, a pipe outer diameter of 8 to 11 mm, a pipe inner diameter of 6 to 9 mm, and a wall thickness. Is 0.7-
A 1.0 mm glass tube having a substantially cylindrical cross section and a length dimension of 110 to 130 mm is formed in a substantially U shape having a top portion 35 that is smoothly curved in the middle portion. That is, each tubular body 34a, 34b, 34c includes a bent portion 36 that smoothly inverts, and a pair of parallel straight tube portions 37 that are continuous with each other at both ends of the bent portion 36.

Both ends of the tube 34b in the middle of the bulb 31 and one ends of the tubes 34a and 34c at both ends of the bulb 31 are sequentially connected by a communication tube 38 to form one continuous discharge path 39. ing. The bulb height H2 is 50-60mm and the discharge path length is 20.
0 to 300 mm, the maximum width D3 in the valve parallel direction is 32 to 4
It is formed to 3 mm.

When the bulb 31 is incorporated in the bulb-type fluorescent lamp 11, the tops 35 (bent portions 36) of the tubes 34a, 34b, 34c are arranged such that the vertical direction of the bulb-type fluorescent lamp 11 is the longitudinal direction. The straight pipe portions 37 of the pipe bodies 34a, 34b, 34c are arranged at equal intervals on one circumference centered on the central axis.
Are also located at equal intervals on a predetermined circumference centered on the central axis of the bulb-type fluorescent lamp 11, that is, the tubes 34a, 34b,
The straight pipe portion 37 of 34c is arranged corresponding to each side of the triangular cross section. Furthermore, regarding each straight pipe portion 37, the distance between the straight pipe portions 37 adjacent to each other in the circumferential direction is determined by the pipe bodies 34a, 3
It is formed to be smaller than the outer diameter of 4b and 34c.

Cylindrical thin tubes 40a, 40b, 40c, which are also called exhaust pipes, are provided at one end of each of the pipes 34a, 34b, 34c so as to communicate with each other. However, the pipes at both ends of the valve 31
The thin tubes 40a and 40c of 34a and 34c are provided so as to project from the end (non-electrode side) opposite to the end where the electrode 33 is sealed. Valve 31
The exhaust of the inside is performed through the thin tubes 40a, 40b and the thin tubes 40c or a part of these thin tubes 40a, 40b, 40c, and after the enclosed gas is filled and replaced, the thin tubes 40a, 4
It is sealed by fusing 0b and 40c. Note that FIG. 1 is a schematic view showing a state before the thin tubes 40a, 40b, 40c are sealed. The tubular body 34 is provided in the thin tubes 40a, 40b, and 40c.
An opening 41 communicating with a, 34b, 34c is formed, and the inner diameter L2 of the opening 41 is smaller than the inner diameter L1 of the inner portion of the thin tubes 40a, 40b, 40c.

The thin tube 40a (or thin tube 40c) closest to the electrode 33 among the thin tubes 40a, 40b, 40c of the tubular bodies 34a, 34b, 34c, that is, the end of the bulb 31 at which the electrode 33 of the tubular body 34a is sealed. An amalgam 42 is enclosed in the thin tube 40a at the end opposite to the portion (non-electrode side) when the thin tube 40a is sealed. The amalgam 42 is an alloy composed of bismuth, indium and mercury, is formed in a substantially spherical shape having a diameter larger than the opening 41 of the thin tube 40a, and controls the mercury vapor pressure in the valve 31 within an appropriate range. Has an effect. The amalgam 42 may be formed of an alloy of tin and lead in addition to bismuth and indium.

If necessary, an auxiliary amalgam may be arranged in the bulb 31 to adsorb the floating mercury in the bulb when it is turned off and to release the adsorbed mercury when the bulb is initially lit, including at the time of starting.

The electrode 33 is a filament coil composed of a triple coil formed by triple winding a tungsten (W) wire.
43, and this filament coil 43 has a beat stem 44
Is supported by a pair of wells (introduction line) 45 fixed by, and each wells 45 is outside the pipes 34a, 34c via a Dumet wire 46 sealed to the glass at the end of the pipes 34a, 34c. It is connected to the derived wire 47. The dumet wire 46 is sealed by a pinch seal portion 48 at the end of the valve. Then, the wire 47 is connected to the lighting circuit 16 when the bulb 31 is incorporated in the bulb-type fluorescent lamp 11.
The filament coil 43 of the electrode 33 in FIG. 4 and the like is a schematic representation.

Further, in FIG. 4, the pipe inner diameter a of the valve 31 is
The relationship between the inner diameter b of the communication tube 38 and the width c of the electrode 33 is shown. The communication tube 38 is formed by connecting the openings formed by blowing and blowing after heating and melting before sealing the thin tubes 40a, 40b, 40c.

The inner diameter a of the bulb 31 and the inner diameter b of the communication tube 38 are set to a relationship of 0.6 <a / b <1.0, and the lamp starting voltage can be lowered and the rise of the light output can be improved. .

The tube inner diameter a of the valve 31 and the width c of the electrode 33 are
(Ac) / 2 <1.5 mm, that is, valve 31
The distance between the inner surface of the tube and the electrode 33 is set to 1.5 mm or less, and the bulb 31 is melted by the excessive heat generation of the electrode 33 at the end of the lamp life, whereby the enclosed gas leaks and the lamp does not light up.

Alternatively, the weight of the electrode 33 per 200 mm is set within the range of 13 mg ± 30, the electrode 33 is generally thick, and it is difficult for the electrode 33 to be broken at the end of the lamp life. The side can be destroyed and stopped so that it goes out.

Alternatively, the electrode 33 is in the form of a coil, the width c of the electrode 33 is in the range of 4 to 7 mm, and the number of 3rd turns of the coil per unit length is set to 1.3 turns / mm or more. At the end of the lamp life, the glow discharge is concentrated on the electrode 33, so that it is easy to break the wire and it is possible to prevent the lamp from being turned off.

The bulb-shaped fluorescent lamp 11 thus constructed has an input power rating of 14 W, and the arc tube 15 has 1
The lamp current is 280 with the high frequency of 2.5W.
mA, lamp voltage is 65V, 3 wavelength emission type phosphor
By using 32, the total luminous flux is 810 lm.

Next, the operation of this embodiment will be described.

A plurality of thin tubes 40 in the middle of the valve 31
By enclosing the amalgam 42 in the thin tube 40a closest to the electrode 33 among a, 40b, and 40c, the temperature of the amalgam 42 is prevented from becoming too high due to the heat effect from the electrode 33, and the amalgam 42 is kept at the start. Can be warmed easily.

That is, the amalgam 42 is connected to the electrode of the bulb 31.
Compared to the case where 33 is arranged at the sealed end, the thermal effect from the electrode 33 on the amalgam 42 is reduced, the excessive rise of the temperature of the amalgam 42 is suppressed, and the mercury vapor pressure is maintained in an appropriate range, Moreover, the distance from the amalgam 42 to both ends of the bulb 31 can be shortened to make the mercury vapor pressure in the bulb 31 uniform and stable. Further, as compared with the case where the amalgam 42 is arranged in the tube body 34b in the middle portion of the valve 31, the amalgam 42 can be easily warmed,
The rising characteristics of the luminous flux are improved, and the time required to reach a stable state can be shortened.

As described above, among the plurality of thin tubes 40a, 40b, 40c in the middle portion of the valve 31, the thin tube 4 closest to the electrode 33 is provided.
By enclosing the amalgam 42 in the 0a (or the thin tube 40c), it is possible to prevent the temperature of the amalgam 42 from becoming too high due to the heat effect from the electrode 33, and it is possible to easily warm the amalgam 42 at the time of starting. The pressure can be maintained within an appropriate range, and the time until the luminous flux becomes stable at the time of starting can be shortened.

By enclosing the amalgam 42 in the thin tube 40a on the non-electrode side of the tube 34a located at one end of the bulb 31, the mercury vapor pressure is kept in an appropriate range and the time until the luminous flux is stabilized at the time of starting is shortened. can do.

Since the opening portion 41 communicating with the tube 34a is narrower than the inner portion of the thin tube 40a in which the amalgam 42 is enclosed, the amalgam 42 can be reliably held in the thin tube 40a.

When the inner diameter of the valve 31 is as thin as 6 to 9 mm, it is difficult to form the thin tubes 40a and 40c together at the ends of the tubes 34a and 34c at both ends of the valve 31 having the electrodes 33. However, it can be easily manufactured by forming the thin tubes 40a and 40c at the non-electrode side ends of the tube bodies 34a and 34c located at both ends. Further, even if the valve 31 has a thin inner diameter of 6 to 9 mm, it is not necessary to reduce the diameters of the thin tubes 40a, 40b, 40c excessively.

By disposing the three tube bodies 34a, 34b, 34c of the valve 31 in correspondence with the respective sides of the triangular cross section, the valve 31 can be formed without bending in a complicated shape such as a saddle shape. The bulb 31 can be constructed in a small size and can be applied to the bulb-type fluorescent lamp 11.

Further, when the inner diameter of the bulb 31 is as thin as 6 to 9 mm, the secondary voltage of the lighting circuit 16 becomes high, it is necessary to increase the voltage at the time of starting the lamp, and the rise of the light output is delayed. There is a problem that the electrode 33 generates heat at the end of the lamp life and causes a thermal effect on the resin product such as the cover body 21 that supports the bulb 31, but these problems are caused by the inner diameter a of the bulb 31 and the communicating pipe. 38 inner diameter b and 0.6
<A / b <1.0, the inner diameter a of the valve 31 and the electrode
This can be solved by setting the width c of 33 to (ac) / 2 <1.5 mm.

The inner diameter a of the valve 31 and the inner diameter b of the communication pipe 38 are set to have a relationship of 0.6 <a / b <1.0, and the communication pipe 38 has a size corresponding to the inner diameter a of the valve 31. By increasing the inner diameter b, the lamp starting voltage can be lowered and the rise of the light output can be improved.

The tube inner diameter a of the valve 31 and the width c of the electrode 33 are set to a relationship of (ac) / 2 <1.5 mm, that is, the valve 31
Set the distance between the inner surface of the tube and the electrode 33 to 1.5 mm or less,
By bringing the inner surface of the bulb 31 closer to the electrode 33, the bulb 31 melts and leaks due to heat generation of the electrode 33 at the end of the lamp life, and the arc tube 15 can be turned off.

Alternatively, if the weight of the electrode 33 per 200 mm is set within the range of 13 mg ± 30, the electrode 33 is less likely to be broken at the end of the lamp life, so that the lighting circuit 16 side is destroyed first and then stopped to emit light. Even if the tube 15 does not leak, the arc tube 15 can be turned off.

Alternatively, if the number of turns of the coil per unit length of the electrode 33 is set to 1.3 turns / mm or more, the glow discharge is concentrated on the electrode 33 at the end of the lamp life, which facilitates the disconnection of the arc tube. 15 can be unlit.

Then, the light bulb type fluorescent lamp 11 is attached to the main body of the equipment having the socket for connecting the general lighting bulb, whereby the lighting equipment can be constructed.

If necessary, an auxiliary amalgam may be provided. With this auxiliary amalgam, mercury can be released in the initial stage of lighting and the rising characteristics of the luminous flux can be improved.

Next, FIGS. 5 and 6 show a second embodiment. FIG. 5 is a developed view of a bulb of a fluorescent lamp, and FIG. 6 is a circuit diagram of a lighting circuit of the fluorescent lamp.

In the arc tube 15, one of the electrodes sealed at both ends of the bulb 31 is a preheating side electrode 33a and the other is a non-preheating side electrode 3
3b, lighting circuit such as inverter connected to power supply E
16 corresponds to a lighting circuit system in which only one side of the preheating side electrode 33a is preheated and started.

The thin tubes 40a, 40b, 40c are projected from one end of each of the tubular bodies 34a, 34b, 34c of the valve 31 in a communicating state. Of these, the thin tubes 40a, 40c of the tubular bodies 34a, 34c at both ends of the valve 31 are Each of the electrodes 33a and 33b is provided so as to project at the end (non-electrode side) opposite to the end where the electrodes are sealed.

The main amalgam 42a as an amalgam is enclosed in the thin tube 40a closest to the preheating side electrode 33a.
The main amalgam 42a has the same structure as the amalgam 42 described above.

An auxiliary amalgam 52a is attached to the wells 45 of each of the electrodes 33a and 33b, and the auxiliary amalgam 52a is enclosed in the bulb 31 together with the electrodes 33a and 33b. The auxiliary amalgam 52a is formed by plating or vapor depositing indium on the surface of a metal foil such as stainless steel or nickel or a high melting point metal foil such as molybdenum, tantalum or niobium.

The thin tube 4 of the tube body 34b located in the middle of the valve 31
An auxiliary amalgam 52b is arranged at the end opposite to 0b and at the end far from the main amalgam 42a. The auxiliary amalgam 52b has the same mercury vapor pressure characteristics as the auxiliary amalgam 52a, and adsorbs mercury vapor when the lamp is off and emits mercury vapor when the lamp is on.

Then, the thin tube 40a closest to the preheating side electrode 33a of the valve 31, that is, the tubular body 3 located at one end of the valve 31.
By enclosing the main amalgam 42a in the thin tube 40a on the non-electrode side of 4a, the main amalgam 42a can be easily warmed by the heat from the preheating side electrode 33a at the time of starting, and the luminous flux rising characteristic can be improved.

Auxiliary amalgam placed on each electrode 33a, 33b
The auxiliary amalgam 52b disposed at the intermediate position between the electrodes 52a and the respective electrodes 33a and 33b allows mercury to be emitted in the initial stage of lighting and the rising characteristics of the light flux can be improved.

By enclosing the auxiliary amalgam 52b having substantially the same mercury vapor pressure characteristics as the main amalgam 42a and the auxiliary amalgam 52a in the valve 31, the main amalgam 4
In cooperation with 2a and the auxiliary amalgam 52a, it is possible to keep the mercury vapor pressure in the bulb 31 in an appropriate range and shorten the time until the luminous flux is stabilized at the time of starting.

Further, in particular, when the lighting circuit 16 of the type in which a preheating current flows is used as in this embodiment, the weight of the preheating side electrode 33a per 200 mm is 13 m.
By setting it within the range of g ± 30, the preheating side electrode 33a is less likely to be broken at the end of the lamp life.
Can be turned off even if the arc tube 15 does not leak, because the lighting circuit 16 side is destroyed and stopped before the leak occurs.

Next, FIG. 7 shows a third embodiment, and FIG. 7 is a plan view of a globe of a fluorescent lamp seen through.

A plurality of U-shaped tube bodies 34a, 34b, 34c are connected and bent so that the surfaces formed by the plurality of U-shaped tube bodies 34a, 34b, 34c are parallel and face each other. A bulb 31 having a shaped discharge path 39 is formed.

In this case, the tubular bodies 34a, 3a on which the electrodes 33 are arranged
Since the distance L2 between the end of the adjacent tube 34b and the electrode 33 is smaller than the distance L1 between the other end of 4c and the electrode 33,
Evaporation of mercury is better when the amalgam 42 (or the main amalgam 42a) is provided in the end portion of the adjacent tube 34b.

In each embodiment, four, five or more valve tubes may be connected.

[0072]

According to the fluorescent lamp of the first aspect, the tube
A plurality of U-shaped pipes with an outer diameter of 8 to 11 mm are installed in parallel and
The bar so that the maximum width in the parallel installation direction is 32 to 43 mm.
As the lens is configured, it has a size equivalent to a bulb for general lighting.
It becomes possible to miniaturize, and furthermore, the electrode is sealed
Pin on the end of the straight pipe section closest to the straight pipe section of the
For encapsulating the amalgam tubules forming the Chishiru portion
So, while suppressing the temperature of the amalgam from becoming too high, the amalgam can be easily warmed up at the time of starting, which allows the mercury vapor pressure to be maintained in an appropriate range, and the time until the luminous flux becomes stable at the time of starting can be shortened. . Only
Also, the inner diameter of the pinch seal part of the thin tube is amalgam
It becomes smaller than the inner diameter of the enclosed part, and
Can hold rugam securely.

According to the fluorescent lamp of the second aspect, in addition to the effect of the fluorescent lamp of the first aspect, by enclosing the amalgam in the thin tube closest to the preheating side electrode of the bulb, the amalgam is easily warmed at the time of starting. Therefore, the rising characteristics of the light flux can be improved .

According to the fluorescent lamp of the third aspect , in addition to the effect of the fluorescent lamp of the first or second aspect , a bulb is provided.
By arranging the auxiliary amalgam at the end portion which does not have the thin tube , the mercury vapor pressure can be kept in an appropriate range and the time until the luminous flux is stabilized at the time of starting can be shortened.

According to the fluorescent lamp of the fourth aspect , in addition to the effect of the fluorescent lamp of any one of the first to third aspects, each tube of the bulb is arranged corresponding to each side of the triangular section. With this, the bulb can be made compact and can be applied to, for example, a bulb-type fluorescent lamp.

According to the compact fluorescent lamp of the fifth aspect , a compact fluorescent lamp having the effect of the fluorescent lamp of any one of the first to fourth aspects can be provided.

[Brief description of drawings]

FIG. 1 shows a first embodiment of a fluorescent lamp of the present invention, (a) is a development view of a bulb of the fluorescent lamp, and (b) is FIG. 1 (a).
It is an expanded sectional view of the A section.

FIG. 2 is a side view of the same fluorescent lamp.

FIG. 3 is a plan view of the same fluorescent lamp as seen through a globe.

FIG. 4 is a partial cross-sectional view of the same fluorescent lamp.

FIG. 5 is a development view of a fluorescent lamp bulb showing a second embodiment of the fluorescent lamp of the present invention.

FIG. 6 is a circuit diagram of a lighting circuit for the fluorescent lamp of the above.

FIG. 7 is a plan view in which a globe of a fluorescent lamp showing a third embodiment of the fluorescent lamp of the present invention is seen through.

[Explanation of symbols]

11 Fluorescent lamp 16 Lighting circuit 31 Bulb 32 Phosphor 33 Electrode 33a Preheating side electrode 33b Non-preheating side electrode 34a, 34b, 34c Tubular body 36 Bent portion 37 Straight pipe section 38 Communication tube 39 Discharge path 40a, 40b, 40c Capillary tube 42 Amalgam 42a Main amalgam as amalgam 48 Pinch seal part 52b Auxiliary amalgam

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takeo Yasuda 4-3-1, Higashi-Shinagawa, Shinagawa-ku, Tokyo Inside Toshiba Lighting & Technology Corporation (56) Reference JP-A-9-92209 (JP, A) JP JP-A 63-225470 JP, A) JP-A 1-220360 (JP, A) JP-A 63-19751 (JP, A) JP-A 9-106782 (JP, A) JP-A 11-185704 (JP, A) ) JP 11-185705 (JP, A) JP 61-61340 (JP, A) JP 2-132749 (JP, A) JP 6-290746 (JP, A) JP 6- 267505 (JP, A) J. Kohei 4-47893 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01J 61/28 H01J 61/30-61/36

Claims (5)

(57) [Claims] 1. A straight pipe part having an outer diameter of 8 to 11 mm.
And a plurality of U-shaped pipe bodies each having a bent portion,
The straight pipe part of the pipe is arranged along the circumference and
Directly connect the tube so that one discharge path is formed by the tube.
The maximum width in the valve arranging direction when the pipe parts are connected in parallel
To be 32 to 43 mm, and the phosphor on the inner surface
Pinchishi the end of the straight tube portion of the tube located at both ends of the valves; but the filler gas is formed and a valve sealed
And a pair of electrodes that are sealed without a capillary tube by at least one of the electrodes ; at least one of the pair of electrodes is sealed.
At the end of the straight pipe section closest to the straight pipe section of the
The pinch seal part formed; the part where the inner diameter of this pinch seal part is away from the pipe side
It is configured to be smaller than the inner diameter of the minute and communicates with the pipe body.
Tubules and which, away from the tube side than the portion of the pinch seal portion of the narrow tube
A fluorescent lamp, comprising: an amalgam enclosed in a closed portion ; 2. One of the electrodes sealed at both ends of the valve is a preheating side electrode and the other is a non-preheating side electrode, and the amalgam is enclosed in a thin tube closest to the preheating side electrode. 1. The fluorescent lamp according to 1. 3. An auxiliary amalgam is sealed at the end of the valve which does not have a thin tube.
Or the fluorescent lamp according to 2 . 4. The fluorescent lamp according to any one of claims 1 to 3 , characterized in that the bulb is arranged so that each tube body corresponds to each side of the triangular cross section. 5. A method according to claim 1 to 4 any one described fluorescent lamp and, compact fluorescent lamp, characterized in that it comprises a; fluorescent lamp and lighting circuit to light the.