WO1999049496A1

WO1999049496A1 - Fluorescent lamp

Info

Publication number: WO1999049496A1
Application number: PCT/JP1999/001238
Authority: WO
Inventors: Kazuaki Ohkubo; Makoto Inohara; Tadashi Yano; Teruaki Shigeta
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 1998-03-20
Filing date: 1999-03-15
Publication date: 1999-09-30
Also published as: EP1063680A4; KR20010042052A; EP1063680A1; CN1293820A

Abstract

A fluorescent lamp, characterized in that the lamp comprises a glass tube the inner wall of which is coated with phosphor and which is filled with a metal vapor and a rare gas, discharge electrodes provided at both ends of the tube, electrode leads supporting the discharge electrodes and adapted for supplying electric power to the discharge electrodes, and reflecting plates each provided between an end sealing part at one end of the tube and the discharge electrode, and that the reflecting plates reflect part of the radiation produced by the discharge caused in the tube and part of the light emitted from the phosphor excited by the radiation, both parts traveling toward the tube ends.

Description

Specification

Hikari Hun Technical Field

The present invention relates to a fluorescent lamp capable of improving lamp efficiency. Background art

The challenge for fluorescent lamps used for lighting is to improve their lamp efficiency. The efficiency of fluorescent lamps has been improved by improving the quantum efficiency of phosphors and the development of high-frequency lighting technology, but it is also reaching its limits.

The electrode portion of the fluorescent lamp emits a large amount of 254 nm radiation that excites the phosphor. FIG. 3 shows the results of measuring the distribution of 254 ηm radiation in the tube axis direction using a GL 20 germicidal lamp. At the same time, the luminance distribution of the fluorescent lamp FL20SSEXD is shown. In this way, near the left and right electrodes of a fluorescent lamp (low-pressure mercury discharge lamp), a large amount of 254 nm radiation is emitted beyond the positive column of the discharge.

However, as shown in Fig. 7, of the radiation at the electrode part, of the 254 nm radiation generated at the electrode part, the radiation toward the tube end is absorbed at the tube end and contributes to the fluorescence. I haven't. In addition, the fluorescent light emitted from the phosphor applied to the glass tube wall is not absorbed by the lamp near the tube end, but is also absorbed in the direction toward the tube end. The inventor has found such a problem.

Improvement of the luminous flux can be expected by efficiently extracting the 254 nm radiation or fluorescent light that does not contribute to the luminous flux from the lamp as the luminous flux of the lamp. Have However, the current use of fluorescent lamps is very popular and the demand for replacing them is large, so that there is no need to change the lamp appearance, electrode socket specifications, and electrical characteristics.

° To improve efficiency. Disclosure of the invention

An object of the present invention is to provide a fluorescent lamp that can solve such a problem.

According to the present invention, there is provided a glass tube in which a phosphor is applied to an inner wall and metal vapor and a rare gas are sealed, discharge electrodes provided at both ends of the glass tube, and the discharge electrodes are supported. An electrode lead for supplying electric power to the discharge electrode; and a reflector provided between the discharge end and a tube end sealing portion at a tube end of the glass tube.

The reflection plate reflects, toward the inside of the glass tube, a component of radiation and light directed toward the end of the tube, out of the radiation generated by the discharge generated in the glass tube and the light excited and emitted by the phosphor by the emission. A fluorescent lamp characterized in that: In addition, the present invention provides a glass tube in which a phosphor is coated on an inner wall and metal vapor and a rare gas are sealed, discharge electrodes provided at both ends of the glass tube, and a support for the discharge electrode, An electrode lead for supplying electric power to the discharge electrode from the above, and a fluorescent plate provided between the discharge electrode and a tube end sealing portion of a tube end of the glass tube,

The fluorescent plate emits a component of the radiation generated by the discharge generated in the glass tube toward a tube end, and further emits a component of the light generated in the glass tube toward the tube end to the glass tube. Fireflies characterized by internal reflection It is a light lamp.

In addition, the present invention provides a glass tube in which a phosphor is coated on an inner wall and metal vapor and a rare gas are sealed, discharge electrodes provided at both ends of the glass tube, and a support for the discharge electrode, And an electrode lead for supplying power to the discharge electrode from

A fluorescent lamp characterized in that a portion of the tube end sealing portion of the tube end of the glass tube facing the discharge electrode forms a reflection surface capable of reflecting the radiation and / or light. It is.

A fluorescent lamp is characterized in that a fluorescent material is applied to a portion of the tube end sealing portion of the tube end of the glass tube facing the discharge electrode side.

According to the present invention, the luminous flux or the radiant flux of the fluorescent lamp can be improved with the same electric characteristics as those of the related art by the above means, and the improvement of the lamp efficiency can be realized. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a configuration diagram near the electrodes of the fluorescent lamp according to the first embodiment of the present invention.

FIG. 2 is a configuration diagram near the electrodes of the fluorescent lamp according to the second embodiment of the present invention. FIG. 3 is a luminance distribution diagram of the GL2 20 and the fluorescent lamp in the tube axis direction. FIG. 4 is a configuration diagram near an electrode of a fluorescent lamp according to a fourth embodiment of the present invention.

FIG. 5 is a process chart for explaining a method for manufacturing a fluorescent lamp according to the fourth embodiment of the present invention.

FIG. 6 is a cross-sectional view showing various forms of a portion facing the discharge electrode side in the embodiment of the present invention.

FIG. 7 is a configuration diagram of a conventional fluorescent lamp.

(Explanation of code)

1 Phosphor

2 Glass tube

3 Discharge electrode

4 Electrode lead

5 Pipe end

6 Diffuse reflector

7 fluorescent screen

5 0 Sealed part at pipe end

50 a Sealing body

50 b Part of the sealing part facing the discharge electrode side BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)

FIG. 1 shows a configuration diagram of Embodiment 1 of the present invention. δ

In FIG. 1, both tube ends 5 (only the left side is shown in FIG. 1) of a glass tube 2 coated with a phosphor 1 have a sealing portion 50 protruding inward for manufacturing. An electrode lead 4 is provided from the outside to the inside of the tube through the sealing portion 50. The discharge electrode 3 is attached to the inner end of the electrode lead 4. The electrode lead 4 supports the discharge electrode 3 and supplies power from the outside of the tube to the electrode 3 inside the tube.

Further, a diffusion reflector 6 is provided on the electrode lead 4 between the sealing portion 50 and the discharge electrode 3. A metal lamp and a rare gas are sealed in the interior to form a fluorescent lamp.

The diffuse reflection plate 6 has no conductivity such as glass plate or ceramic plate, and the material capable of withstanding the high temperatures at the time of the fluorescent lamp manufacturing, high subjected ultraviolet wavelength region from B a S 0 ₄ T i O which visible It is composed of a material coated with reflectivity.

The radiation generated by the discharge generated in the glass tube 2 and the emission of the phosphor 1 reflected by the radiation inside the tube, of which the radiation and light components heading toward the tube end 5 are diffused by the diffuse reflector 6. The light reflected from the inside of the glass tube 2 enhances the luminous flux or radiant flux.

(Embodiment 2)

FIG. 2 shows a configuration of Embodiment 2 of the present invention.

In FIG. 2, both tube ends 5 (only the left side is shown in FIG. 1) of the glass tube 2 coated with the phosphor 1 have a sealing portion 50 protruding to the inside for manufacturing. An electrode lead 4 is provided from the outside to the inside of the tube through the sealing portion 50. The discharge electrode 3 is attached to the inner end of the electrode lead 4. The electrode lead 4 supports the discharge electrode 3 and supplies power from the outside of the tube to the electrode 3 inside the tube.

Further, a fluorescent plate 7 is provided on the electrode lead 4 between the sealing portion 50 and the discharge electrode 3. A metal lamp and a rare gas are sealed inside to construct a fluorescent lamp.

The fluorescent plate 7 is formed by applying or attaching a fluorescent substance to a material that does not have conductivity, such as a glass plate or a ceramic plate, and that can withstand the high temperature at the time of manufacturing the fluorescent lamp.

The fluorescent plate 7 is illuminated by ultraviolet radiation, such as 254 nm and 185 nm, emitted from the discharge of the discharge electrode 3 in the direction of the tube end 5 to excite the phosphor. Also, the phosphor 1 coated on the tube wall of the glass tube 2 emits light due to the radiation generated by the discharge generated in the glass tube 2, and a component of the light emission toward the tube end 5 is separated by the fluorescent plate 7. The light is reflected toward the inside of the glass tube to increase the luminous flux or radiant flux.

Actually, a lamp was manufactured in which the fluorescent plate 7 coated with the same fluorescent material for EXD was attached to the electrode lead 4 of the fluorescent lamp of FL20SSEXD. At this time, the fluorescent plate 7 was fixed at a position of 10 to 15 mm from the discharge electrode 3 toward the tube end 5.

The lamp with the fluorescent plate 7 and the lamp without the fluorescent plate (conventional lamp) were manufactured simultaneously, and their characteristics were compared at lighting power of 18 W. The lamp voltage and tube current were almost the same, and the luminous flux was low. An improvement of about 2.3% was obtained.

(Embodiment 3)

Embodiment 3 of the present invention will be described. The configuration of the third embodiment is similar to that of the second embodiment. In this configuration, the phosphor 1 applied to the glass tube 2 and the phosphor applied to the phosphor plate 7 are intentionally different from each other.

The FL20S SEXD fluorescent lamp described in the second embodiment is a three-wavelength emission fluorescent lamp, in which three or more kinds of phosphors are mixed and applied. Therefore, the color of the entire lamp can be easily adjusted by changing the phosphor of the fluorescent plate 7 in various ways with respect to the fluorescent lamp having the same mixing ratio.

(Embodiment 4)

FIG. 4 is a fourth embodiment of the present invention. In this embodiment, a portion 50b of the tube end sealing portion 50 of the tube end 5 facing the discharge electrode 3 has a disk shape. This disc-shaped portion 50b is larger than the thickness of the main body 50a of the sealing portion 50.

(Embodiment 3)

Further, in the embodiment of FIG. 4, the size of the disc-shaped portion 50 b is substantially the same as the size of the cross section inside the glass tube 2.

Further, on the surface of the disc-shaped portion 50b, the material of the diffuse reflection plate and the material of the fluorescent plate described in the first and second embodiments are formed. This portion 5 Ob makes it possible to improve the radiant flux and the luminous flux as described in the first and second embodiments.

Next, a method of forming such a disk-shaped portion 50b will be described. In FIG. 5, first, a member for forming the pipe end 5 is made. That is, a glass tube 20 having both open ends is prepared (a). Both ends of the glass tube 20 are conically enlarged and formed (b). A thin glass tube 21 and an electrode lead material 22 are introduced into the glass tube 20 (c). And the glass tube 20 On the other side, a flat mold 23 (a through hole in the center, in which the tip of the electrode lead material 22 escapes) is abutted, and the center of the glass tube 20 is While pressing the mold 24, the center of the glass tube 20 is squeezed and fused to the thin glass tube 21. At this time, the tip of the thin glass tube 21 is sealed, and air is fed from the other end, so that a hole 25 is formed in the lateral portion. As a result, a disk-shaped surface 26 is formed at the portion in contact with the mold 23. Then, a discharge electrode is attached to the tip of the electrode lead 22.

The member for forming the tube end portion 5 formed in this way is fitted and fused to the end of the glass tube of another prepared fluorescent lamp with the discharge electrode 3 inside. Thus, the fluorescent lamp according to the fourth embodiment is completed.

By changing the shape of the mold 23, various shapes of the disk-shaped portion 26 can be obtained.

The shape of the portion of the present invention that faces the reflection plate, the fluorescent plate, and the discharge electrode is not limited to the shapes described in the embodiments, but may be various shapes as shown in FIG. It is only necessary to prevent radiation toward the part 5 and light components from being directed toward the tube end 5 and absorbed.

FIG. 6A shows a type in which a large number of projections are formed on the surface, FIG. 6B shows a type in which a large number of irregularities are formed, and FIG. 6C shows a type in which a concave shape is formed. Industrial applicability

As described above, according to the present invention, the luminous flux of the fluorescent lamp can be improved with the same electrical characteristics as before, and the lamp efficiency can be improved.

Claims

The scope of the claims

1. A glass tube in which a phosphor is applied to the inner wall and metal vapor and a rare gas are sealed, discharge electrodes provided at both ends of the glass tube, the discharge electrodes are supported, and electric power is supplied from outside the tube to the discharge electrodes. And a reflector provided between the tube end sealing portion at the tube end of the glass tube and the discharge electrode, wherein the reflector is formed by discharge generated in the glass tube. A fluorescent lamp characterized in that, of the radiation and the light excited and emitted by the phosphor by the radiation, a component of the radiation and light directed toward the end of the tube is reflected inside the glass tube.

2. A glass tube coated with a phosphor on the inner wall and filled with metal vapor and a rare gas, discharge electrodes provided at both ends of the glass tube, supporting the discharge electrodes, and supplying power to the discharge electrodes from outside the tube. And a fluorescent plate provided between a tube end sealing portion at a tube end of the glass tube and the discharge electrode, wherein the fluorescent plate emits radiation due to discharge generated in the glass tube. The fluorescent lamp emits light with a component traveling toward the end of the tube, and further reflects, of the light generated in the glass tube, a component traveling toward the end of the tube into the inside of the glass tube.

3. The fluorescent lamp according to claim 1, wherein the fluorescent plate has a different kind of fluorescent material from the fluorescent material applied inside the glass tube.

4. The fluorescent lamp according to claim 1, wherein the fluorescent plate has the same kind of fluorescent material as the fluorescent material applied inside the glass tube. Pump.

5. The shape of the reflection plate or the fluorescent plate may be a cone or dome shape whose axis is substantially coincident with the tube axis of the glass tube, or a plurality of irregularities are formed on the surface, or the surface thereof The fluorescent lamp according to claim 1, wherein a plurality of protrusions are formed on the fluorescent lamp.

6. A glass tube in which a phosphor is applied to the inner wall and metal vapor and a rare gas are sealed, discharge electrodes provided at both ends of the glass tube, the discharge electrodes are supported, and power is supplied from outside the tube to the discharge electrodes. A portion facing the discharge electrode side of the tube end sealing portion of the tube end of the glass tube, a reflecting surface capable of reflecting the radiation and / or light. A fluorescent lamp characterized by forming

7. A glass tube coated with a phosphor on the inner wall and filled with metal vapor and a rare gas, discharge electrodes provided at both ends of the glass tube, supporting the discharge electrodes, and supplying power to the discharge electrodes from outside the tube. An electrode lead for supplying a fluorescent material, wherein a fluorescent material is applied to a portion of the tube end sealing portion at the tube end of the glass tube facing the discharge electrode side.

8. The fluorescent light according to claim 6, wherein a portion of the tube end sealing portion facing the discharge electrode has a disk shape larger than a thickness of a main body portion of the tube end sealing portion. lamp.

9. The portion of the tube end sealing portion facing the discharge electrode has a disk shape having substantially the same size as the internal longitudinal section of the glass tube. Or the fluorescent lamp according to 7.

10. Shape of the part of the glass tube sealing part facing the discharge electrode side The shape may be a cone or dome shape whose axis is substantially coincident with the tube axis of the glass tube, or a plurality of irregularities may be formed on the surface, or a plurality of protrusions may be formed on the surface. The fluorescent lamp according to any one of claims 6 to 9, wherein the fluorescent lamp is formed.

11. The portion of the tube end sealing portion facing the discharge electrode side has a disk shape having a size smaller than a size of an internal vertical cross section of the glass tube. The fluorescent lamp as described.