JPH05114387A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To reduce a decrease in luminous efficiency, and to eliminate directional restriction at the outer surfaces of a tube, and to facilitate insulation, and to reduce leakage current and noise by extendedly positioning a first and a second electrode on only the outer surfaces at both the local end parts of a translucent tube. CONSTITUTION:Electrodes 6, 7 are extendedly positioned on only the outer surfaces 9, 10 respectively at both the local end parts 1g, 1h of a translucent tube 1. Therefore, the ratio of the area occupying the region corresponding to the region positioning the electrodes 6, 7 of a fluoescent material layer 3 and its nearby region to the total area of the layer 3 is reduced compared with conventional area ratio. The result reduces a decrease in luminous efficiency as a fluorescent lamp compared with conventional decrease in luminous efficiency. In addition, in using the fluorescent lamp, restriction relating to the directions of the outer surfaces of the tube 1 is substantially eliminated to readily apply insulation, and to dramatically reduce leakage current compared with conventional leakage current, and to dramatically reduce noise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent discharge lamp which can be used as a light source required for liquid crystal display devices, copying machines, facsimiles and the like.

[0002]

2. Description of the Related Art Conventionally, both ends are closed by end plate portions 1a and 1b, and the inner surface 2 except the inner surfaces of the end portions 1d and 1e having a slight length on the side of both end plate portions 1a and 1b. The phosphor layer 3 is uniformly formed over the entire area, and the inside thereof is made of a rare gas such as xenon gas that emits ultraviolet rays when receiving a discharge, or is formed of argon, krypton, neon, xenon gas, or the like. There is a transparent tube 1 made of, for example, glass, in which an enclosure 4 made of a rare gas and mercury is sealed, and the transparent tube 1 is provided.
On the outer surface 5 of the portion 1f having a long length, excluding the end portions 1d and 1e having a slight length on the side of the end plate portions 1a and 1b, continuous between both end edges in the length direction. A fluorescent discharge lamp having a structure in which two electrodes 6 and 7 extending in a strip shape are arranged so as to face each other with a tube axis 0-0 interposed therebetween is proposed.

According to the conventional fluorescent discharge lamp having such a structure, an AC voltage having a relatively high frequency of 30 KHz and a relatively high voltage of 1 KV is applied between the electrodes 6 and 7. When the obtained AC power source 8 is connected, a discharge is generated in the translucent tube body 1, whereby
Ultraviolet rays are emitted from the enclosure 4, and the ultraviolet rays cause the phosphor layer 3 formed on the inner surface 2 of the transparent tube 1 to
Irradiation is performed over the entire area, and thus light emission is obtained from the entire area of the phosphor layer 3, and the light is emitted to the outside of the translucent tube body 1. Therefore, it can be used as a light source required for liquid crystal display devices, copying machines, facsimiles and the like.

[0004]

In the case of the fluorescent discharge lamp shown in FIG. 4, since the electrodes 6 and 7 are not arranged in the transparent tube body 1, the electrodes 6 and 7 are not damaged by the discharge, Therefore, the life of the fluorescent discharge lamp is longer than that in the case where the electrodes 6 and 7 are arranged in the translucent tube 1, and the fluorescent discharge lamp uses the electrodes 6 and 7 as the translucent tube. It has an advantage that it can be easily configured as compared with the case where it is arranged in one.

However, the electrodes 6 and 7 are arranged in the longitudinal direction on the outer surface 5 of the portion 1f having a long length excluding the ends 1d and 1e having a slight length of the transparent tube 1. Since it continuously extends in a strip shape between both end edges, the ratio of the area occupied by the region corresponding to the region where the electrodes 6 and 7 of the phosphor layer 3 are arranged to the entire area of the phosphor layer 3. However, it is relatively large. For this reason, the region corresponding to the region where the electrodes 6 and 7 of the phosphor layer 3 are arranged and the region in the vicinity thereof are changed to other regions by the ions generated in the translucent tube 1 by the above-mentioned discharge. As compared with the above, the light emitting efficiency of the fluorescent discharge lamp is reduced because it deteriorates earlier.
It had the drawback that the amount of reduction was relatively large.

Also, the electrodes 5 and 6 are provided on the outer surface of the portion 1f having a long length excluding the end portions 1d and 1e having a slight length of the transparent tube 1, and both ends in the longitudinal direction thereof. Since the electrodes 6 and 7 have a light-shielding property, the light-transmitting property is increased because the electrodes 6 and 7 have a light-shielding property because they extend continuously in a band shape between the edges and face each other with the tube axis 0-0 interposed therebetween. Radiating outward from the tube axis 0-0 of the tube body 1 and radiating to the outside only in a direction in which a local region where the electrodes 6 and 7 of the transparent tube body 1 are not arranged is considered,
Therefore, there is a drawback in that there is a restriction on the orientation of the outer surface of the transparent tube 1 in use.

Further, the electrodes 6 and 7 are formed on the outer surface of the portion 1f having a long length excluding the end portions 1d and 1e having a slight length of the translucent tube 1 and the longitudinal direction thereof. As it is continuously extended between both edges of the
For safety, the electrodes 6 and 7 should be installed around the fluorescent discharge lamp.
When it is necessary to insulate from the above, the insulation has a long length corresponding to a long-length portion 1f excluding both ends 1d and 1e having a slight length of the translucent tube 1. However, there is a drawback in that it is difficult to apply the insulation.

In addition, in use, when the conductors are closely opposed to each other over the entire length of the translucent tube body 1 to form a stray capacitance between the conductor and each of the electrodes 6 and 7, the electrodes are Reference numeral 6 and 7 are parts 1 having a long length, except for a part of both ends 1d and 1e of the translucent tube 1 which are slightly long.
On the outer surface of f, since it continuously extends in a strip shape between both end edges in the length direction, the area where the electrodes 6 and 7 face the conductor is relatively large, and therefore the above-mentioned stray capacitance is Relatively large, and therefore the current from the AC power source 8 leaks to the outside through the stray capacitance between the conductor and the electrodes 6 and 7 and through the conductor to the outside as a leakage current with a large value, As the AC power supply 8, it is necessary to prepare one having a large capacity, and there is a drawback that a large noise is induced due to the large leakage current.

Thus, the present invention does not have the above-mentioned drawbacks.
The purpose is to propose a new fluorescent discharge lamp.

[0010]

The fluorescent discharge lamp according to the first invention of the present application has both ends closed and a phosphor layer formed on the inner surface, as in the case of the conventional fluorescent discharge lamp described above with reference to FIG. It has a light-transmitting tube body that is formed and has an enclosed material made of a rare gas or a rare gas and mercury enclosed therein, and a first tube is formed on the outer surface of the light-transmitting tube body. 1st and 2nd
The electrodes are arranged.

However, in the fluorescent discharge lamp according to the first invention of the present application, in the fluorescent discharge lamp having such a configuration, the first and second electrodes have local end portions of the transparent tube. Are extended only on the outer surface of each.

Further, the fluorescent discharge lamp according to the second invention of the present application is the fluorescent discharge lamp according to the first invention of the present application,
The at least one third electrode is arranged only on the outer surface of the translucent tube at the upper part of the local extension.

[0013]

In the fluorescent discharge lamp according to the first invention of the present application, the first and second electrodes have a long length excluding both ends having a slight length of the transparent tube. On the outer surface of the transparent part, only on the outer surface at the local both ends of the translucent tube, instead of being continuously extended between the both edges in the longitudinal direction in a strip shape and arranged opposite to each other. Since it has the same configuration as that of the conventional fluorescent discharge lamp described above with reference to FIG. 4 except that it is arranged in an extended manner, it has the same configuration as that of the conventional fluorescent discharge lamp described above with reference to FIG. When an AC power supply is connected between the first and second electrodes, a discharge is generated in the light-transmissive tube, whereby ultraviolet rays are radiated from the enclosed material, and the ultraviolet rays form the inner surface of the light-transmissive tube. The entire phosphor layer is irradiated, so that light is emitted from the entire phosphor layer. Is, the light is emitted to the translucent tube body. Therefore, as in the case of the conventional fluorescent discharge lamp described above with reference to FIG. 4, it can be used as a light source required for a liquid crystal display device, a copying machine, a facsimile and the like.

Further, as in the case of the conventional fluorescent discharge lamp described above with reference to FIG. 4, since the first and second electrodes are not arranged in the light-transmitting tube, the first and second electrodes are The fluorescent discharge lamp is not damaged by the discharge, so that the life of the fluorescent discharge lamp is the same as that of the conventional fluorescent discharge lamp described above with reference to FIG. 4, and the first and second electrodes are arranged in the transparent tube. In addition to the above case, the fluorescent discharge lamp has the first and second electrodes arranged in the light-transmitting tube as in the case of the conventional fluorescent discharge lamp described above with reference to FIG. Compared with the case, it has an advantage that it can be easily configured.

However, in the case of the fluorescent discharge lamp according to the first invention of the present application, the first and second electrodes are arranged so as to extend only on the outer surfaces at both local ends of the transparent tube. Therefore, the ratio of the area occupied by the region corresponding to the region where the first and second electrodes of the phosphor layer are arranged and the region in the vicinity thereof to the total area of the phosphor layer is as described above with reference to FIG. It is much smaller than the conventional fluorescent discharge lamp. For this reason, the region corresponding to the region where the first and second electrodes of the phosphor layer are arranged and the region in the vicinity thereof are changed to other regions by the ions generated in the transparent tube by the above-mentioned discharge. As compared with the conventional fluorescent discharge lamp described above with reference to FIG. 4, the luminous efficiency of the fluorescent discharge lamp is reduced, and the amount of decrease is significantly smaller than that of the conventional fluorescent discharge lamp.

Further, since the first and second electrodes are respectively extended and arranged only on the outer surfaces at the local both ends of the light-transmitting tube, and are not extended on the outer surfaces of other portions, Even if the first and second electrodes have a light-shielding property, the light is radiated from the tube axis of the translucent tube through a portion excluding both ends of the translucent tube having a slight length. To the outside 360
It is obtained by radiating outwards in all directions of 0 ° and therefore has practically no restrictions on the orientation of the outer surface of the transparent tube in use.

Further, since the first and second electrodes are respectively extended and arranged only on the outer surfaces at the local both ends of the light-transmissive tube body, from the viewpoint of safety in use, Even when it is necessary to insulate the periphery of the fluorescent discharge lamp from the first and second electrodes, the insulation may be provided only in a region of a short length corresponding to both ends of the translucent tube. The insulation can be provided more easily than in the case of the conventional fluorescent discharge lamp described above with reference to FIG.

In use, since the conductors are closely opposed to each other over the entire length of the transparent tube, the conductors and the first
Even when a stray capacitance is formed between the first and second electrodes, the first and second electrodes are extended and arranged only on the outer surfaces of the local ends of the translucent tube. Therefore, the area where the first and second electrodes face the conductor is smaller than that in the conventional fluorescent discharge lamp described above with reference to FIG.
The stray capacitance described above is significantly smaller than that of the conventional fluorescent discharge lamp described above with reference to FIG. 4, so that the current from the AC power source and the conductor and the first and second
Even if the leakage current leaks to the outside through the stray capacitance between the electrode and the electrode, and through the conductor, the leakage current is significantly higher than that of the conventional fluorescent discharge lamp described above with reference to FIG. Therefore, it is sufficient to prepare, as the AC power supply, one having a significantly smaller capacity than that of the conventional fluorescent discharge lamp described above with reference to FIG. 4, and noise is induced due to the leakage current. Even so, the noise is significantly smaller than that of the conventional fluorescent discharge lamp described above with reference to FIG.

[0019]

First Embodiment Next, a first embodiment of the fluorescent discharge lamp according to the present invention will be described with reference to FIG.

In FIG. 1, parts corresponding to those in FIG. 4 are designated by the same reference numerals.

The fluorescent discharge lamp according to the present invention shown in FIG. 1 has both ends thereof closed by the end plate portions 1a and 1b, and the inner surface 2 is the same as in the conventional fluorescent discharge lamp described in FIG.
Ends 1 having a slight length on both end plate portions 1a and 1b
The phosphor layer 3 is uniformly formed over the entire area excluding the inner surfaces of d and 1e, and the inside thereof is made of a rare gas such as xenon gas that emits ultraviolet rays by receiving a discharge, or argon. , A krypton, neon, xenon gas, or another rare gas such as mercury, and a light-transmitting tube body 1 made of, for example, glass. Localized ends 1d and 1 including ends 1d and 1e, respectively, having a slight length
Only on the outer surfaces 9 and 10 at both ends 1g and 1h which are longer than e but have only a slight length, the two electrodes 6 and 7 are located on the outer surfaces of the parts 1i and ij excluding the ends 1d and 1e, respectively. They are arranged so as to surround each of them and extend in an annular shape.

In this case, the electrodes 6 and 7 may be a conductive foil such as a copper foil, a ring conductor, or a conductive paint.

The above is the configuration of the first embodiment of the fluorescent discharge lamp according to the present invention.

According to the fluorescent discharge lamp of the present invention having such a structure, the electrodes 6 and 7 have a long length excluding both ends 1d and 1e having a slight length of the transparent tube 1. On the outer surface 5 of the portion 1f, instead of being continuously extended between the both edges in the lengthwise direction and extending in the form of a strip so as to be opposed to each other, the both end portions 1g of the translucent tube 1 are locally located. And 1h, the structure is similar to that of the conventional fluorescent discharge lamp described above with reference to FIG. 4, except that it is arranged only on the outer surfaces 9 and 10 respectively. Similar to the case of the fluorescent discharge lamp, if a similar AC power source 8 is connected between the electrodes 6 and 7, a similar discharge is generated in the translucent tube body 1, whereby ultraviolet rays from the enclosure 4 are also generated. The fluorescent light that is emitted and is formed on the inner surface of the transparent tube 1 by the ultraviolet rays. The layer 3 is irradiated similarly over its entire area, thus, likewise emission is obtained from the entire area of the phosphor layer 3, the light radiates similarly to first outer translucent tube. Therefore, as in the case of the conventional fluorescent discharge lamp described above with reference to FIG. 4, it can be used as a light source required for a liquid crystal display device, a copying machine, a facsimile and the like.

Also, since the electrodes 6 and 7 are not arranged in the transparent tube 1 as in the case of the conventional fluorescent discharge lamp described above with reference to FIG. 4, the electrodes 6 and 7 are damaged by the discharge. Therefore, when the life of the fluorescent discharge lamp is assumed to be the same as that of the conventional fluorescent discharge lamp described above with reference to FIG. 4, the electrodes 6 and 7 are arranged in the translucent tube body 1. In comparison with the case where the electrodes 6 and 7 are arranged in the translucent tube 1, as in the conventional fluorescent discharge lamp described above with reference to FIG. It has an advantage that it can be easily configured.

However, in the case of the fluorescent discharge lamp according to the present invention shown in FIG. 1, the electrodes 6 and 7 extend only on the outer surfaces 9 and 10 at the local ends 1g and 1h of the transparent tube 1, respectively. Therefore, the ratio of the area occupied by the region corresponding to the region where the electrodes 6 and 7 of the phosphor layer 3 are arranged and the region in the vicinity thereof to the entire area of the phosphor layer 3 is It is significantly smaller than that of the conventional fluorescent discharge lamp described above with reference to FIG. Therefore, the phosphor layer 3
The region corresponding to the region in which the electrodes 6 and 7 of the above and the region in the vicinity thereof are deteriorated earlier than other regions by the ions generated in the translucent tube body 1 by the above-mentioned discharge. Therefore, the luminous efficiency of the fluorescent discharge lamp is reduced, and the amount of the decrease is significantly smaller than that of the conventional fluorescent discharge lamp described above with reference to FIG.

Further, since the electrodes 6 and 7 are arranged only on the outer surfaces 9 and 10 at the local both ends 1g and 1h of the light-transmissive tube 1, respectively, and do not extend onto the outer surfaces of other portions. Even if the electrodes 6 and 7 have a light-shielding property, the light is transmitted through the light-transmitting tube 1 at both ends 1g and 1h having a slight length.
It is obtained by radiating outward in all directions of 360 ° when viewed in the radial direction from the tube axis 0-0 of the translucent tube 1 from the portion excluding. There is substantially no restriction on the orientation of the outer surface of the light tube 1.

Further, since the electrodes 6 and 7 are arranged so as to extend only on the outer surfaces 9 and 10 at the local ends 1g and 1h of the light-transmissive tube 1, respectively, they are safe to use. Even if it is necessary to insulate the area around the fluorescent discharge lamp from the electrodes 6 and 7 from the above surface, the insulation should be provided only in a short length region corresponding to both ends 1g and 1h of the transparent tube 1. It suffices to apply it, and therefore the insulation can be applied more easily than in the case of the conventional fluorescent discharge lamp described above with reference to FIG.

In addition, in use, even when stray capacitance is formed between the conductor and each of the electrodes 6 and 7 due to the conductor being closely opposed to the transparent tube body 1 over its entire length. Since the electrodes 6 and 7 are extended and arranged only on the outer surfaces 9 and 10 of the local end portions 1g and 1h of the transparent tube 1, the areas where the electrodes 6 and 7 face the conductor However, it is significantly narrower than the case of the conventional fluorescent discharge lamp described above with reference to FIG. 4, and thus the stray capacitance described above is significantly smaller than that of the conventional fluorescent discharge lamp described above with reference to FIG. Therefore, even if the current from the AC power source 8 leaks through the stray capacitance between the conductor and the electrodes 6 and 7 and through the conductor to the outside as a leakage current, the leakage current is small. Compared with the case of the conventional fluorescent discharge lamp mentioned above, And thus, as the AC power source 8, FIG. 4
It is sufficient to prepare a lamp having a significantly smaller capacity than the conventional fluorescent discharge lamp described above, and even if noise is induced due to the leakage current, the noise is shown in FIG. It is significantly smaller than the case of the conventional fluorescent discharge lamp described above.

In use, instead of directly connecting the AC power supply 8 between the electrodes 6 and 7, both ends of the AC power supply 8 are connected to the primary coil as shown in FIG. 1A. 11a and a secondary coil 11b connecting the middle point to the ground
And a secondary coil 11b of the transformer 11 connected to both ends of the primary coil 11a of the transformer 11, respectively.
It is also possible to obtain the light radiated to the outside of the transparent tube 1 by connecting both ends of each to the electrodes 6 and 7, respectively, and by doing so,
When the AC power source 8 is directly connected between the electrodes 6 and 7, there is a difference in the emission intensity between one side and the other side of the electrodes 6 and 7, such as uneven emission intensity distribution. Does not substantially occur.

[0031]

Second Embodiment Next, a second embodiment of the fluorescent discharge lamp according to the present invention will be described with reference to FIG.

In FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the fluorescent discharge lamp according to the present invention shown in FIG. 2, the light-transmitting tube 1 is curved in a W shape and extends for a long time, and
Only on the outer surface 13 at the local central portion 1k as a locally extending upper part of the translucent tube 1, the other electrodes 12 are disposed on the outer surfaces 9 and 10 at both ends 1g and 1h. 7 has the same structure as the fluorescent discharge lamp according to the present invention described above with reference to FIG.

Since the fluorescent discharge lamp according to the present invention having such a structure has the same structure as the fluorescent discharge lamp according to the present invention described above with reference to FIG. 1, except for the matters described above,
Although detailed description is omitted, for example, one end of the AC power supply 8 is connected to the electrodes 6 and 7 and the other end is connected to the electrode 1 as illustrated.
It is apparent that, by connecting the light-transmissive tube 1 to the light-transmissive tube 1, the same operational effect as in the case of the fluorescent discharge lamp according to the present invention described above with reference to FIG. ..

[0035]

Third Embodiment Next, a third embodiment of the fluorescent discharge lamp according to the present invention will be described with reference to FIG.

In FIG. 3, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the fluorescent discharge lamp according to the present invention shown in FIG. 3, the end plate portions 1a and 1b of the transparent tube body 1 are curved inward, and the local end portions 1g of the transparent tube body 1g. The outer surfaces 9 and 10 of 1 and 1h include the outer surfaces of the end plate portions 1a and 1b, and only on the outer surfaces 9 and 10, the electrodes 6 and 7 extend to the outer surfaces of the end plate portions 1a and 1b, respectively. It has the same structure as the fluorescent discharge lamp according to the present invention described above with reference to FIG. 1, except that the fluorescent discharge lamp is extended and arranged.

Since the fluorescent discharge lamp according to the present invention having such a structure has the same structure as the fluorescent discharge lamp according to the present invention described above with reference to FIG. 1, except for the matters described above,
Although detailed description is omitted, the same operation and effect as in the case of the fluorescent discharge lamp according to the present invention described above with reference to FIG. 1 can be obtained.

However, in the case of the fluorescent discharge lamp according to the present invention shown in FIG. 3, both local end portions 1g and 1h of the transparent tube 1 are provided.
The electrodes 6 and 7, which are respectively extended only on the outer surfaces 9 and 10, of the end plates 1a and 1b, respectively, are provided on the outer surfaces of the end plates 1a and 1b as compared with the case of the fluorescent discharge lamp according to the present invention described above with reference to FIG. As it has a large area due to extension,
The same operational effects as in the case of the fluorescent discharge lamp according to the present invention described above in (1) can be obtained more effectively than in the fluorescent discharge lamp according to the present invention described above with reference to FIG.

In the above description, only a few examples of the present invention are shown, and in the structure of the fluorescent discharge lamp according to the present invention shown in FIGS. 1 and 2, the transparent tube 1 is curved and extended. In addition, the plurality of electrodes may be extended in accordance with the case of the fluorescent discharge lamp according to the present invention described above with reference to FIG. Alternatively, various modifications and changes may be made without departing from the spirit of the present invention.

[Brief description of drawings]

FIG. 1 shows a first embodiment of a fluorescent discharge lamp according to the present invention, and is a schematic plan view (FIG. 1A) showing a part in section and a vertical sectional view through a portion where an electrode thereof is arranged (FIG. 1B).

FIG. 2 is a schematic plan view showing a second embodiment of the fluorescent discharge lamp according to the present invention.

FIG. 3 is a schematic plan view showing a third embodiment of the fluorescent discharge lamp according to the present invention, a part of which is shown in section.

FIG. 4 is a schematic plan view (FIG. 4A) partially showing a cross section of a conventional fluorescent discharge lamp and a vertical cross section thereof (FIG. 4B).

[Explanation of symbols]

 1 translucent tube 1a, 1b end plate part 1d, 1e, 1g, 1h, 1i, 1j, 1k end part 2 inner surface 3 phosphor layer 4 inclusion 5 outer surface 6, 7 electrode 8 AC power supply 9, 10 outer surface 11 Transformer 12 Electrode 13 Outer surface

Front Page Continuation (72) Inventor Yasushi Kitajima 2-17-8 Chuo, Ota-ku, Tokyo Elevam Co., Ltd.

Claims (2)

[Claims] 1. A translucent tube body having both ends closed, a phosphor layer formed on the inner surface, and an enclosure containing a rare gas or a rare gas and mercury enclosed therein. A fluorescent discharge lamp having first and second electrodes on the outer surface of the transparent tube, wherein the first and second electrodes are local to the transparent tube. A fluorescent discharge lamp, wherein the fluorescent discharge lamp is arranged so as to be extended only on the outer surfaces of both end portions. 2. The fluorescent discharge lamp according to claim 1, wherein at least one third electrode is provided only on an outer surface of the translucent tube in a locally extending upper part thereof. Fluorescent discharge lamp to do.