JP2006318742A - Fluorescent lamp and lighting system using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp capable of stable lighting without causing non-lighting by a pin hole or a crack in a part of an external electrode. <P>SOLUTION: This fluorescent lamp 1 is provided with the external electrodes 5 at both ends on the outside surface of a translucent tube. Each external electrode 5 is characterized by being formed with: a solder layer 2 formed on the outside surface of the translucent tube; a coil-like metal wire 3 wound around the solder layer; and an outer solder layer 4 formed on the surface of the coil-like metal wire. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fluorescent lamp and an illumination device using the fluorescent lamp.

  Conventionally, as a fluorescent lamp having an electrode on the outer surface of a glass tube, one having a configuration shown in FIGS. 7 and 8 is known. In this conventional outer electrode fluorescent lamp 11, solder layers are formed as outer electrodes 12 at both ends of the outer surface of the glass tube. When the conventional external electrode fluorescent lamp 11 is mounted on the power supply side electrode portion for lighting, as shown in FIGS. 8A and 8B, the external electrode 12 at the end of the fluorescent lamp 11 is spring-loaded. It is mounted so as to be press-fitted into the contact terminal 13 having elasticity.

  In the case of this conventional fluorescent lamp 11, since the solder layer as the external electrode 12 can be easily manufactured with a uniform thickness, the electric resistance distribution is uniform and the electric field generated when the lamp current flows is uniform. And the luminance can be improved.

However, since the conventional fluorescent lamp 11 has a structure in which only a thin solder layer is provided as the external electrode 12 at both ends, when it is incorporated in the contact terminal 13 as shown in FIG. There is a problem in terms of product life, because the part is scratched and easily peeled off and partly removed, and pinholes and cracks may occur in the underlying glass tube, leading to non-lighting. Further, in the conventional fluorescent lamp, when the electrode part temperature becomes 180 ° C. or more due to the heat generation of the external electrode part, there is a problem that pinholes or cracks are generated in the same manner, leading to non-lighting.
JP 2003-168392 A

  The present invention has been made in view of the above-mentioned problems of the prior art, and a fluorescent lamp capable of stable lighting without causing non-lighting due to pinholes or cracks in the external electrode portion, and the like It aims at providing the illuminating device using.

  The invention of claim 1 is a fluorescent lamp provided with external electrodes at both ends of the outer surface of the translucent tube, wherein the external electrode includes a solder layer formed on the outer surface of the translucent tube; The coil-shaped metal wire wound around the solder layer and an outer solder layer formed on the surface of the coil-shaped metal wire are characterized in that they are formed.

  According to a second aspect of the present invention, in the fluorescent lamp of the first aspect, the coiled metal wire is a wire having a flat cross-sectional shape that comes into surface contact with the solder layer.

  An illumination device according to a third aspect of the invention is characterized in that the fluorescent lamp of the first or second aspect is used as a light source and an external electrode of the fluorescent lamp is attached to a contact terminal.

  According to the fluorescent lamp of the present invention and the lighting device using the same, since the coiled metal wire is wound around the outer electrode and the hand layer around the external electrode, this is used as the contact terminal of the lighting device. There is no risk that the solder layer will be peeled off or detached when it is mounted, and it is possible to make mechanical and electrical stable contact with the contact terminal, resulting in pinholes or cracks in the external electrode, leading to non-lighting. And stable lighting is possible.

  Further, according to the fluorescent lamp of the present invention and the lighting device using the same, the coil-shaped metal wire provided on the external electrode portion of the fluorescent lamp has a flat cross-sectional shape, so that the inner solder layer The electrical contact with the surface becomes a surface contact, and the electrical characteristics can be further stabilized.

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

  (First Embodiment) FIG. 1 shows a fluorescent lamp 1 according to one embodiment of the present invention. In the figure, 1 is a fluorescent lamp, 2 is a solder layer, 3 is a coil, 4 is an outer solder layer formed on the outer surface of the coil 3, and 5 is an external electrode. In the present embodiment, phosphors are applied to the inner wall, both ends are closed, and both ends of the outer surface of the fluorescent lamp 1 made of a translucent tube in which an enclosure made of rare gas and mercury is enclosed. The solder layer 2 is formed, the coil 3 is wound around the outer surface of the solder layer 2, and the outer solder layer 4 is further formed on the surface of the coil 3 to constitute the external electrode 5. In the case of the present embodiment, the wire of the coil 3 has a circular cross section.

  As shown in FIG. 8, the fluorescent lamp 1 according to the present embodiment is press-fitted into the contact terminal 13 of the lighting device to elastically contact the contact terminal 13 and the external electrode 5 as shown in FIG. The terminal 13 is turned on by supplying high frequency power.

  According to this embodiment, when this is press-fitted into the contact terminal 13 of the illuminating device in order to use it as a light source of the illuminating device, the winding is not formed on the outer surface of the solder layer 12 instead of the thin solder layer 12 as in the prior art. Therefore, the coil 3 and the outer solder layer 4 are in contact with the contact terminal 13, so that a part of the external electrode 5 is not easily peeled off and dropped as in the prior art. Stable contact is possible, and stable lighting is possible.

(Second Embodiment) FIGS. 2 and 3 show a fluorescent lamp according to a second embodiment of the present invention. The feature of the second embodiment lies in the shape of the coil 30. In the first embodiment, the coil 3 has a circular cross section, but in the present embodiment, FIGS. ), The coil 30 has a flat shape with an oval cross section. 2 and 3, elements common to the first embodiment shown in FIG. 1 are denoted by the same reference numerals. That is, 1 is a fluorescent lamp, 2 is a solder layer, 4 is an outer solder layer formed on the outer surface of the coil 30, and 5 is an external electrode. As shown in FIG. 8, the contact terminal 13 and the external electrode 5 are brought into elastic contact with each other by press-fitting into the contact terminal 13 of the lighting device, and the contact terminal 13 is turned on by supplying high frequency power. .

  According to the present embodiment, as shown in FIG. 3, since the cross section of the coil 30 is flattened, the contact area with the solder layer 2 or the contact terminal 13 is widened compared to the coil having a circular cross section. In addition, more stable contact can be achieved mechanically, and the lighting characteristics can be further improved.

  4 is a cross-sectional view of the external electrode 5 portion of the fluorescent lamp 1 of the first embodiment, and FIG. 5 is a cross-sectional view of the external electrode 5 portion of the fluorescent lamp 1 of the second embodiment. Yes. As is clear from these figures, in the case of the first embodiment, the coil 3 is in line contact with the inner solder layer 2, but in the case of the second embodiment, the coil 30 has a flat cross section. Because of its shape, it is in surface contact with the solder layer 2 and can improve electrical stability.

  FIG. 6 is a graph showing the distribution of the tube wall temperature in the lamp axis direction of the fluorescent lamps of the conventional example, the first embodiment, and the second embodiment. The tube wall temperature distribution of the conventional fluorescent lamp shown by curve A, the tube wall temperature distribution of the fluorescent lamp of the first embodiment shown by curve B1, and the fluorescent lamp of the second embodiment shown by curve B2. Comparing the tube wall temperature distribution, the fluorescent lamp of the first embodiment shows that the tube wall temperature at the external electrode 5 at the end of the lamp is significantly lower than that of the conventional fluorescent lamp. I understand. In the case of the fluorescent lamp of the second embodiment, it can be seen that the tube wall temperature of the portion of the external electrode 5 is further lower than that in the case of the first embodiment.

  Thus, in the case of the fluorescent lamp according to the second embodiment, the tube wall temperature at the external electrode 5 can be greatly reduced, and pinholes or cracks can occur in the glass tube, leading to non-lighting. The reliability is low and the reliability is improved.

The front view of the fluorescent lamp of the 1st Embodiment of this invention. The front view of the fluorescent lamp of the 2nd Embodiment of this invention. The front view and sectional drawing of the coil used for the part of the external electrode in the said 2nd Embodiment. Sectional drawing of the part of the external electrode in the fluorescent lamp of the said 1st Embodiment. Sectional drawing of the part of the external electrode in the fluorescent lamp of the said 2nd Embodiment. The figure which shows distribution of the tube wall temperature of the lamp axial direction in each lighting test of the conventional fluorescent lamp, the fluorescent lamp of 1st Embodiment, and the fluorescent lamp of 2nd Embodiment. The front view of the conventional fluorescent lamp. The front view and side view which show the structure of the electrode part of the conventional illuminating device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluorescent lamp 2 Solder layer 3 Coil 4 Outer solder layer 5 External electrode 13 Contact terminal 30 Coil

Claims (3)

A fluorescent lamp provided with external electrodes at both ends of the outer surface of the translucent tube,
The external electrode includes a solder layer formed on the outer surface of the translucent tube, a coiled metal wire wound around the solder layer, and an outer solder formed on the surface of the coiled metal wire. A fluorescent lamp characterized by being formed of layers.   The fluorescent lamp according to claim 1, wherein the coiled metal wire is a wire having a flat cross-sectional shape in surface contact with the solder layer. 3. A lighting device comprising the fluorescent lamp of claim 1 or 2 as a light source, and an external electrode of the fluorescent lamp attached to a contact terminal.

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