JPS6235255Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a fluorescent lamp having a double inner and outer tube structure in which an inner bulb is disposed substantially coaxially within an outer bulb.

1 and 2 are cross-sectional views and vertical cross-sectional views showing the structure of a conventional fluorescent lamp of this type, and diagrams showing a lighting circuit. In the figure, 1 is a cylindrical outer bulb made of a translucent material such as glass, and 2 is an inner bulb that is installed approximately coaxially with this outer bulb 1 and has an open upper end. 1 forms a discharge vessel. 3 is the inner side of the outer valve 1 and the inner valve 2
4 is a filament-shaped cathode coated with an electron radioactive material provided inside the inner bulb 2; 5 and 6 are outside of the inner bulb 2 and of the outer bulb 1; This is the anode provided inside. The insides of the inner and outer valves 2 and 1 are evacuated, and a predetermined amount of rare gas and mercury (not shown) are sealed therein. Note that 7 is a ballast, 8 is a diode bridge, and 9 is an AC power source.

When AC power is applied to the fluorescent lamp configured as described above, the fluorescent lamp lights up. The fluorescent lamp is started by connecting the open end of the cathode 4 to the
A glow lamp or the like may be connected between the anodes to utilize the kick voltage generated in the ballast 7, or a starter using a semiconductor or the like may be used. Here, a discharge current that has been full-wave rectified by the diode bridge 8 flows through the fluorescent lamp, and at this time, the discharge flows through the anode 5.
This occurs between the anode 6 and the cathode 4 and between the anode 6 and the cathode 4.
Therefore, when looking at the luminance of the fluorescent lamp surface in the circumferential direction, it is high near where plasma is generated by the discharge, and decreases in the direction perpendicular to the discharge. That is, the luminance on the surface of the fluorescent lamp was uneven, and the appearance was not desirable. Furthermore, the lighting circuit also required a diode bridge 8, which tended to be expensive.

SUMMARY OF THE PRESENT EMBODIMENT The present invention is directed to providing a fluorescent lamp which can be lit by a simple lighting circuit, has a uniform surface brightness, and has a simple sealing portion, thereby eliminating the above-mentioned drawbacks.

The details of this invention will be explained below according to the illustrated embodiments. 3 and 4 are a cross-sectional view and a vertical cross-sectional view of a fluorescent lamp showing an embodiment of this invention, and FIG. 5 is a cross-sectional view and a diagram showing a lighting circuit. In the figure, 1 is the outer bulb, 2 is the inner bulb, 3 is the phosphor, 4 is the cathode, 7 is the ballast, 9
are AC powered and are similar to conventional fluorescent lamps. According to the embodiment, the dimensions of each part of the fluorescent lamp are as follows: the outer bulb 1 has a diameter of 75 mm and a length of
120mm, and the inner bulb 2 has a diameter of φ32mm and a length of 100mm, so the cathode 4 and anodes 51, 52, 61, 6
The discharge distance with 2 is approximately 190mm. Although not shown, the inner and outer valves 2,
The inside of the chamber 1 is evacuated, and a predetermined amount of rare gas and mercury are sealed.

51, 52, 61 and 62 are arranged at equal intervals between the inner bulb 2 and the outer bulb 1, and
and 52 and 61 and 62 are rod-shaped anodes provided at opposing positions, and these anodes 51 and 52 and anodes 61 and 62 are connected by connecting wires 10 and 11 in the outer bulb 1, respectively. 2
They form a group of anodes. Anodes 51, 52 and 6
Reference numerals 1 and 62 are bar-shaped rods that protrude in the direction of discharge generated between the anodes and the anodes, and the connecting wires 10 and 11 are connected so that the tips of the anodes 51 and 52 protrude from the connecting wires 10 and 11. be. Also, the anode is not coated with any material that facilitates electron emission. Note that the distance between the connecting line 10 and the connecting line 11 is 5 mm. 8
1 and 82 are diodes whose cathodes are connected to the anode 51 and the anode 6, respectively.
1 lead wires 12 and 13, and each anode is connected to one end of the cathode 4. Although not shown, the cathode is coated with an electron emitting material to facilitate electron emission. 6th
The figure is a perspective view to make it easier to understand Figure 5, and to simplify the figure, the fluorescent lamp has an anode 5.
Only 1, 52, 61, 62, the cathode 3, and its accessories are shown, and the others are omitted.

In this figure, 14 and 15 are lead lines 12 and 1.
3 and a discharge vessel composed of inner and outer bulbs 2 and 1.

In the fluorescent lamp configured as described above, when AC power source 9 is applied, the fluorescent lamp lights up. To start the fluorescent lamp, a glow lamp may be connected between the open end of the cathode 4 and the lead wires 12 and 13, and the kick voltage generated in the ballast 7 may be used. You may also use Here, a case will be described in which a glow lamp is connected between the open end of the cathode 4 and the lead wire 12. When the contacts of the glow lamp close due to glow discharge, the polarity of the AC power source 9 is reversed to the polarity shown in FIG. 5, the glow lamp → cathode 4 → diode 81 → ballast 7
The preheating current flows in this order. With this preheating current, the cathode 4
is heated to a temperature of 800 to 1000°C, where it easily emits electrons. In this state where the cathode 4 is sufficiently heated, the cathode 4 and anodes 51, 52 (or 61, 6
The discharge starting voltage between 2) is approximately 200V. After that, the contacts of the glow lamp are opened, and the cathode 4 and anode 5
The voltage of the AC power supply 9 and the kick voltage generated in the ballast 7 are applied in a superimposed manner between 1 and 52 or 61 and 62. This voltage is applied to the anodes 51, 52 and 6 at the same time.
It is also applied between cathode 4 and anode 5.
1, 52 (or 61, 62) is as low as about 200V, the cathode 4 and anode 51, 52
(or 61, 62), the discharge starts, becomes an arc discharge, and lights up with the current limited by the ballast 7,
Anodes 51 and 52, anodes 61 and 62, and connection wire 1
No discharge occurs between the connection line 11 and the connection line 11. Also, if there is no discharge between the anodes 51, 52 and 61, 62 (for example, if both ends of the cathode 4 are short-circuited), the kick voltage will increase. A slight discharge occurs due to dielectric breakdown only during the period when voltage is generated.
However, this discharge does not receive a large amount of electrons from the anode, so when the high voltage caused by the kick voltage ends, the discharge cannot be maintained and disappears. When the polarity of the AC power source 9 is changed to the half cycle shown in the figure, the discharge current of the fluorescent lamp lit in this way is as follows: AC power source 9 → ballast 7 → lead wire 13 → anodes 61 and 62 → cathode 4 diode 82 → AC It flows along the route of power supply 9. Note that since the anodes 61 and 62 simultaneously operate as anodes, the discharge current is divided almost equally between the anode 61 and the cathode 4 and between the anode 62 and the cathode 4. Therefore, between the anode 61 and the cathode 4, and the anode 62
Two lines of discharge occur simultaneously between the cathode 4 and the cathode 4. At this time, the anodes 51 and 52 have almost the same potential as the cathode 4, but because they are not coated with an electron radioactive substance, it is difficult to emit electrons and they cannot operate as cathodes, and the anodes 51 and 52 Anode 61,6
No discharge occurs between the two.

On the other hand, when the polarity of the AC power supply 9 is reversed, the discharge current flows in the order of the AC power supply 9 → the lead wire 12 → the anodes 51 and 52 → the cathode 4 → the diode 81 → the ballast 7 → the AC power supply 9. At this time as well, the polarity of the AC power source 9 is the same as that shown in the figure.
The discharge currents between the anode 52 and the cathode 4 and between the anode 52 and the cathode 4 become approximately equal. Therefore, two lines of discharge occur between the anode 51 and the cathode 4 and between the anode 52 and the cathode 4. Further, discharge between the anodes 61 and 62 and the anodes 51 and 52 does not occur as in the case where the polarity of the AC power supply 9 is as shown.

As described above, in the fluorescent lamp of the above embodiment, discharge is performed in each opposing discharge path in response to the positive and negative half cycles of the AC power supply 9, and the uniformity of plasma in the circumferential direction is increased. The brightness of the surface is approximately uniform in the circumferential direction. Also, the lighting circuit is simplified because it only requires two diodes. Furthermore, anodes 51 and 52 and anodes 61 and 62
are connected by connecting lines 10 and 11 within the outer valve 1, respectively, so the inner and outer valves 2 and 1
Only the lead wires 12 and 13 from the discharge vessel consisting of
Two locations, 4 and 15, are sufficient, and each anode 51, 52, 6
Compared to the case where each of the lead wires 1 and 62 is brought out of the discharge vessel and sealed, the steps in manufacturing the fluorescent lamp can be omitted, and the external structure of the fluorescent lamp is also simplified.

FIG. 7 is a cross section of a fluorescent lamp and its lighting circuit diagram showing another embodiment of the invention. This is because the above embodiment has anodes 51 and 52 and anode 61.
and 62 are arranged in the diametrical direction centering on the cathode 4, whereas the anodes 51 and 52 and the anodes 61 and 62 are arranged adjacent to each other, respectively.

Even in such a fluorescent lamp, if the polarity of the AC power source 9 is as shown in the figure, the discharge will occur between the anode 61 and the cathode 4.
and between the anode 62 and the cathode 4, and when the polarity of the AC power source is reversed, between the anode 51 and the cathode 4, and between the anode 52 and the cathode 4.
A discharge occurs simultaneously between the two. Therefore, discharge occurs in each adjacent discharge path corresponding to the positive and negative half cycles of the AC power supply 9, the uniformity of the plasma in the circumferential direction increases, and the brightness of the fluorescent lamp increases in the circumferential direction. It becomes Hoichi-sama. Further, since only the lead wires 12 and 13 are drawn out from the discharge vessel, sealing with the discharge vessel is also simplified.

In the above embodiments, the case where there are four anodes has been described, but it is also possible to provide an even number of anodes of four or more, and to form two anode groups. becomes even more uniform, and even if the number of anodes increases, the sealing with the discharge vessel is only with the lead wires 12 and 13 and is not complicated.

Further, the shape of the outer bulb 1 is not limited to a cylindrical shape, and the cross section may be a circular shape, an oval shape, or the like. Further, although it is not necessary to arrange the anodes at equal intervals, it is desirable to arrange the anodes at equal intervals in the circumferential direction in order to improve the uniformity of the plasma in the circumferential direction. Furthermore, the lighting circuit such as the ballast 7, diodes 81 and 82, and the starting circuit are connected to the inner and outer valves 1,
It can also be integrated with a second-class light emitting part and attached with an E-26 cap, which is used for general lighting incandescent light bulbs, to create a structure that can replace incandescent light bulbs.

As described above, according to this invention, the fluorescent lamp has a double inner and outer tube structure consisting of an outer bulb and an inner bulb, and four or more anodes are provided between the inner bulb and the outer bulb. The anode is divided into two anode groups, each anode group is connected in parallel inside the outer bulb, and one set of anode group is sealed with the discharge vessel consisting of the inner and outer bulbs using one lead wire. , and since discharge is performed between the cathode provided in the inner bulb and the anode group in the positive and negative half cycles of the AC power supply, multiple lines of discharge are different between each anode. Because the discharge path passes through the pipe, the uniformity of the plasma inside the discharge vessel is improved, and not only can the entire fluorescent lamp emit light uniformly, but the lighting circuit is also simpler, and the sealing with the discharge vessel is also easier. This has the advantage of simplifying the manufacturing process of a fluorescent lamp that requires only two lead wires.

[Brief explanation of the drawing]

Figures 1 and 2 are a cross-sectional view of a conventional fluorescent lamp, a vertical cross-section of the fluorescent lamp, and its lighting circuit diagram, and Figures 3 and 4 are diagrams of a fluorescent lamp showing an embodiment of this invention. cross-sectional and longitudinal sections;
Figure 5 is a cross section of the fluorescent lamp shown in Figures 3 and 4 and its lighting circuit diagram, Figure 6 is a perspective view of only the main parts of Figure 5 and the lighting circuit, and Figure 7 is a diagram showing the lighting circuit. 2 is a cross section of a fluorescent lamp and its lighting circuit diagram showing another embodiment of this invention. In addition, the same reference numerals in the figures indicate the same or equivalent parts, 1 is the outer bulb, 2 is the inner bulb, 3 is the phosphor, 4 is the phosphor, 51, 52 and 61, 6.
2 is an anode, 7 is a ballast, 81 and 82 are diodes, 9 is an AC power supply, 10 and 11 are connection wires, 1
2 and 13 are lead lines, and 14 and 15 are sealing parts.

Claims (1)

[Scope of utility model registration request] A rare gas and a metal are sealed in a discharge vessel with a double tube structure inside and outside, in which an inner bulb with one end opened almost coaxially with an outer bulb is provided, and a cathode coated with an electron radioactive substance is provided in the inner bulb. Further, in a fluorescent lamp in which two sets of anode groups are provided between the inner bulb and the outer bulb, and a discharge occurs between the anode group and the cathode, the anode group has a rod-like shape protruding in the direction of the discharge. The method comprises a plurality of anodes and a connecting wire that connects the anodes, the connecting wires are connected such that the anodes protrude from the connecting wires, and the anodes and the connecting wires are made of a material that does not easily emit electrons, Each of the two anode groups has one lead wire from the outer bulb, and a cathode is connected to each lead wire, and both anodes each have a diode connected to one end of the cathode, and A fluorescent lamp characterized in that an AC power source is connected between each lead wire through a ballast.