JP2003197005A - Bulb-type fluorescent lamp - Google Patents

Abstract

(57) [Summary] (Modified) [PROBLEMS] To provide a bulb-type fluorescent lamp capable of easily applying a heat conductive substance to an electronic component of a lighting circuit. When a heat conductive substance is filled inside a divided body, the cover body of the bulb-shaped fluorescent lamp is constituted by a plurality of divided bodies.
Since the work of filling the heat conductive substance 6 can be performed before the plurality of divided bodies 10a and 10b are joined to each other, the work of filling the cover body with the heat conductive substance 6 becomes easy.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a bulb-type fluorescent lamp.

[0002]

2. Description of the Related Art A bulb-type fluorescent lamp is constructed by supporting a fluorescent lamp having a discharge path formed by connecting a plurality of U-shaped and bent bulbs together. ing. The cover body has a base and houses a lighting circuit for lighting the fluorescent lamp.

In such a bulb-type fluorescent lamp, there is a concern that the temperature inside the cover body during lighting may exceed the heat resistant temperature of the electronic parts constituting the lighting circuit. As a countermeasure against this, for example, as described in Japanese Patent Application Laid-Open No. 5-250905, in order to prevent the temperature in the cover from rising due to the heat generated in the lighting circuit, the lighting circuit, the case, the holder, and the glove are respectively bonded with a silicone adhesive. Then, a technique is known in which the heat of the lighting circuit is radiated from the cover and the globe through the silicone adhesive.

[0004]

The above-mentioned prior art has a structure in which the heat radiation adhesive flows into the lighting device through the opening formed in the edge portion of the holder and comes into contact with the lighting device. Therefore, when the electronic components of the lighting device are filled with the synthetic resin, there is a problem that the synthetic resin flows out before curing, and there is a problem that the filling work is difficult.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a light bulb type fluorescent lamp capable of easily depositing a thermally conductive substance on electronic components of a lighting circuit.

[0006]

According to a first aspect of the present invention, there is provided a self-ballasted fluorescent lamp having a bent fluorescent lamp, a holder for supporting the fluorescent lamp, a base attached to one end and a holder attached to the other end. A cover body composed of a plurality of divided bodies divided in a direction orthogonal to the direction from one end to the other end; and a plurality of electronic components constituting a lighting circuit for lighting a fluorescent lamp are mounted on a circuit board. Is
A lighting circuit housed in the cover body; a thermally conductive substance filled inside some of the divided bodies so as to contact at least a part of a plurality of electronic components of the lighting circuit and an inner surface of the cover body, respectively. Is provided.

The term "heat-conductive substance" as used herein means a substance having a heat conductivity higher than that of air and formed of a viscous body having a certain fluidity before curing.

Further, the fluorescent lamp has a U-shaped straight bulb.
In the case of being bent in a letter shape, the bent portion may have a semicircular shape or a U shape. Further, the bent portions may be formed by connecting the adjacent ends of the two straight pipe valves to each other with a connecting pipe.

In the compact fluorescent lamp according to the first aspect of the present invention, the cover body is composed of a plurality of divided bodies, and when the thermally conductive substance is filled inside the divided bodies, before the plurality of divided bodies are joined to each other. The work of filling the heat conductive substance can be performed, and the work of filling the heat conductive substance into the cover body becomes easy.

In the light bulb type fluorescent lamp according to a second aspect, among the plurality of electronic components mounted on the circuit board of the light bulb type fluorescent lamp according to the first aspect, the electronic component having low heat resistance comes into contact with the heat conductive substance. It is characterized by doing.

As used herein, the electronic component having low heat resistance means
It refers to electronic components such as electrolytic capacitors that have a relatively low heat resistance temperature.

In the self-ballasted fluorescent lamp according to the second aspect, in addition to the effect according to the first aspect, the electronic parts having a low heat resistance on the circuit board and the inner surface of the cover are in contact with the heat conductive material. The heat effect of the electronic component having low heat resistance is suppressed, and the heat of the lighting circuit is efficiently radiated from the cover body to the outside.

According to a third aspect of the present invention, in the light bulb type fluorescent lamp, among the plurality of electronic components mounted on the circuit board of the light bulb type fluorescent lamp according to the first aspect, the electronic component having a large heat generation comes into contact with the heat conductive substance. It is characterized by doing.

The component having a large amount of heat generation here means an electronic component including a switching element such as a transistor.

According to the electric bulb type fluorescent lamp of the third aspect, in addition to the effect of the first aspect, the electronic component having a large heat generation among the plurality of electronic components mounted on the circuit board and the inner surface of the cover are heated. Since it is in contact with the conductive material, the heat from the electronic component that generates a large amount of heat is efficiently radiated to the outside, and it is possible to further suppress the temperature rise inside the cover body.

According to a fourth aspect of the present invention, the light bulb type fluorescent lamp is characterized in that the heat conductive material of the light bulb type fluorescent lamp according to any one of the first to third aspects is a silicone resin.

According to the invention described in claim 4, in addition to the effect of the light bulb type fluorescent lamp according to any one of claims 1 to 3, the heat conductive material is made of a highly versatile silicone resin, so that heat It is possible to obtain a bulb-type fluorescent lamp that has good conductivity and can be manufactured at low cost.

According to a fifth aspect of the present invention, there is provided a light bulb type fluorescent lamp including the light bulb type fluorescent lamp according to any one of the first to fourth aspects; and an instrument body to which the light bulb type fluorescent lamp is attached. It is a feature.

According to the lighting equipment of the fifth aspect, it is possible to provide the lighting equipment equipped with the bulb-type fluorescent lamp having the action of the invention of any one of the first to fourth aspects.

[0020]

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

FIG. 1 is a side view showing a first embodiment of the compact fluorescent lamp of the present invention, FIG. 2 is an exploded view of the compact fluorescent lamp of FIG. 1, and FIG. 3 is a compact fluorescent lamp of FIG. It is sectional drawing which shows the manufacturing process of a lamp.

The cover 1 of the bulb-type fluorescent lamp is made of a heat-resistant synthetic resin such as polybutylene terephthalate (PB).
T), the upper end 1c has a cylindrical portion 1a on which the mouthpiece 2 is covered, and the upper end 1c has a substantially bowl-shaped rotating body shape that is extended in the direction of the lower end 1d and has an opening on the lower end 1d side. Have On the inner surface inside the opening 1d of the cover body 1,
A groove 1b is formed around the periphery thereof. The cover body 1 is divided into approximately two parts so as to be divided by a pair of boundary lines formed from the top circumferential surface of the cylindrical portion 1a of the upper end 1c to the lower end surface 1d. That is, the divided bodies 10a, 10b of the divided cover body 1
Is divided such that each circumferential surface has a substantially semi-circular shape. Engaging means (not shown) that is elastically engaged with each other by concave-convex fitting is integrally formed on each of the joint portions 10c of the two divided bodies 10a and 10b.

At the lower end 1d of the cover body 1, for example, PBT
A holder 3 formed of a heat-resistant synthetic resin such as a resin and having a substantially disc shape is attached. Several mounting holes (not shown) for mounting a plurality of fluorescent lamps are formed on the disc surface of the holder 3. Further, a side wall 3a is formed on the peripheral edge of the holder 3 so as to stand up from the disc surface, and a flange-shaped convex portion 3b protruding outward from a substantially middle portion of the side wall is formed. Then, the convex portion 3b of the holder 3 and the groove portion 1b formed on the inner surface of the cover are engaged and fixed.

The fluorescent lamp 4 is constructed by joining three bending bulbs 4a. The tops of the bent bulbs 4a are located at equal intervals in a circle around a central axis whose longitudinal direction is the vertical direction of the bulb-type fluorescent lamp. Are located at regular intervals around a center axis of the. That is,
The bent portion of each bending valve 4a is arranged corresponding to each side of the substantially triangular shape. A luminous body is formed on the inner surface of each bending bulb 4a, and a rare gas such as argon and mercury are enclosed in the interior of the bulb 4a as an enclosed gas. The three bulbs 4a are made of glass and have a substantially cylindrical cross section, and are smoothly bent in a U-shape at an intermediate portion. A pair of continuous straight tube portions 4b of the respective bulbs 4a, which are parallel to each other, serve as a communicating tube to form one continuous discharge path. A pair of electrodes are sealed at the ends 4c of the fluorescent lamp 4 located at both ends of the discharge path.

The bulb sealing end 4c of the fluorescent lamp 4 is inserted into a lamp mounting hole formed in the holder, and the bulb end 4c and the periphery of the lamp mounting hole are bonded and fixed by a silicone resin or the like. The fluorescent lamp 4 is fixed to the holder 3.

On the side of the holder 3 where the fluorescent lamp is not mounted, the lighting circuit 5 is attached by fitting means (not shown).

The lighting circuit 5 is a disc-shaped circuit board 5 arranged on a plane parallel to the longitudinal direction of the fluorescent lamp 4.
In addition, a plurality of electronic components 5b are mounted on the non-fluorescent lamp side surface of the circuit board 5a, that is, the side surface of the base, to form an inverter circuit for high-frequency lighting.

The inverter circuit as the lighting circuit 5 mounted on the holder 3 is located in the space covered by the cover body 1 via the holder 3, and the circuit board 5a.
An electronic component for high frequency lighting using a transistor inverter is mounted on and configured. As the electronic component, for example, a noise filter, a full-wave rectifier, an electrolytic capacitor, a field effect transistor (FET), a choke ballast, a DC cut capacitor, a resonance inductor, a resonance capacitor and the like are used.

A resonance inductor is arranged substantially in the center of the circuit board 5a, and an electrolytic capacitor is arranged above the resonance inductor. A part of the electrolytic capacitor is housed inside the cylindrical portion 1a at the upper end of the cover body 1 while standing upright on the circuit board 5a. Lead wire (not shown)
Is led out from the circuit board 5a, is placed in the gap between the electrolytic capacitor and the cylindrical portion 1a, and is connected to the base 2.

Circuit board 5 centering on the resonance inductor
Of the plurality of electronic components 5b in the region on one side of a,
An electronic component 5b such as a film capacitor or an electrolytic capacitor having low heat resistance is arranged, and on the other hand, a field effect transistor having a large heat generation amount is arranged.

Next, the manufacturing and assembling steps of the compact fluorescent lamp of this embodiment will be described with reference to FIG.

First, the holder 3 to which the fluorescent lamp 4 and the lighting circuit 5 are mounted as described above is prepared, and one side portion of the lighting circuit 5 on which the electronic component 5b having low heat resistance is mounted is downward. The divided body 1 thus arranged on the lower side
The holder protrusion 3b is attached to the groove 1b of 0a. That is, the side of the lighting circuit 5 to which the electronic component 5b having low heat resistance is attached is attached so as to be located inside the divided body 10a. Therefore, the opening of the divided body 10a is directed upward, and the electronic component 5b having lower heat resistance than the opening side is filled with the silicone resin 6 as the heat conductive material (FIG. 3A). As a result, the silicone resin 6 is filled in the divided body 10a, the silicone resin 6 is less likely to flow to the outside of the cover body 1, and the filling work is facilitated. Further, the silicone resin 6 before curing tends to slowly flow down on the inclined surface, but since it has such a viscosity that it does not flow out on a substantially flat surface, the silicone resin 6 is removed from the cylindrical portion inside the cover body 1. It is difficult to leak. A rib or the like may be formed inside the cylindrical portion of the divided body 10a as a means for preventing the silicone resin from flowing out.

After the silicone resin 6 is cured, the other divided body 10b is covered from above so that the groove portion 1b in the divided body 10b and the convex portion 3b of the holder 3 are fitted to each other (FIG. 3).
(B)). Then, they are elastically fitted to each other by the concavo-convex fitting formed on the joint portion 10c of the respective divided bodies 10a and 10b. After that, the cylindrical portion 1a of the cover body 1 is covered with the base 2 (FIG. 3C), and the base 2 is attached by caulking or the like.

After that, the inner peripheral edge of the lower end 1d of the cover body and the outer peripheral edge of the globe opening 7a are bonded and fixed with an adhesive such as a silicone resin.

Incidentally, the fitting of the plurality of divided bodies 10a, 10b and the holder 3 is not limited to the above-mentioned embodiment as long as the connection can be surely made and no trouble is caused by the respective joining.

With the above configuration, when the lighting circuit 5 of the compact fluorescent lamp is powered on, a starting voltage is applied between the pair of electrodes of the fluorescent lamp by the lighting circuit 5 and the fluorescent lamp starts discharging. , The compact fluorescent lamp lights up.

During the lighting of the bulb-type fluorescent lamp, the lighting circuit 5
Generate heat and the temperature inside the cover body 1 housed compactly rises to some extent, but the electronic component 5b having low heat resistance is
Since it is covered with the heat conductive silicone resin 6, the temperature inside the silicone resin 6 and the cover body 1 rises to some extent, but since heat is efficiently radiated to the outside of the cover body 1 through the silicone resin 6, the self The temperature rise will be suppressed.

Further, it is possible to dissipate the heat in the cover body 1 by providing a gap in the fitting portions of the divided bodies 10a and 10b which are the joint portions 10c of the cover body 1 which are divided. However, due to the action of the silicone resin 6, a sufficient heat radiation effect can be obtained without providing such a gap.

Although the bulb-type fluorescent lamp of the above embodiment has the globe 7 that covers the arc tube 4, the globe 7 may not be provided.

As described above, in the light bulb type fluorescent lamp of the present embodiment, by making the cover body 1 separable, the work of filling the silicone resin 6 is facilitated and the electronic component 5b is surely made of the silicone resin 6. Can be filled. In addition, the inside of the divided body 10 divided into two and the lighting circuit 5
By filling the electronic component 5b having low heat resistance with the silicone resin 6 having good heat conductivity, it is possible to reliably protect the electronic component 5b having low heat resistance and provide the highly reliable lighting circuit 5. Become. As a result, it is possible to improve the life characteristics, and it is possible to provide a bulb-type fluorescent lamp having excellent commercial properties.

Next, the operation of the second embodiment will be described.

The bulb-type fluorescent lamp of this embodiment is
Except for the arrangement of electronic components on the circuit board, it is the same as in the first embodiment, and therefore illustration is omitted.

The holder 3 to which the fluorescent lamp 4 and the lighting circuit 5 are mounted as described above is prepared so that the other side portion of the lighting circuit 5 on which the electronic component 5b, which generates a large amount of heat, is mounted is on the lower side. And the divided body 10a arranged on the lower side,
The holder protrusion 3b is attached to the groove 1b. That is, the lighting circuit 5 to which the electronic component 5b that generates a large amount of heat is attached.
It is attached so that the side part of is positioned inside the divided body 10a. Therefore, the opening of the divided body 10a faces upward, and the electronic component 5b that generates more heat than the opening side.
A silicone resin 6 as a heat conductive substance is filled in the center.

During the lighting of the bulb-type fluorescent lamp, the lighting circuit 5
Heats up, and the temperature inside the cover body 1 housed compactly rises to some extent, but since the electronic component 5b with a large amount of heat is covered with the heat conductive silicone resin 6, the electronic component 5b with a large amount of heat is The heat is efficiently radiated to the outside of the cover body 1 via the silicone resin 6, so that the temperature rise in the cover body 1 is suppressed.

As described above, by filling the electronic component 5b, which generates a large amount of heat in the lighting circuit 5, and the one-piece divided body 10 divided into two, with the silicone resin 6 as the heat conductive material, the outside of the cover body 1 is covered. It enables efficient heat dissipation,
The temperature inside the cover body 1 is suppressed from becoming high. further,
Since the electronic component 5b having low heat resistance is also protected, it is possible to provide the highly reliable lighting circuit 5.

FIG. 3 is a partially cutaway sectional view showing an embodiment of the lighting fixture of the present invention.

In the figure, numeral 34 is a compact fluorescent lamp. Reference numeral 30 denotes an embedded luminaire main body, which comprises a base 31, a socket 32, and a reflector 33.

[0048]

According to the first aspect of the invention, the cover body is composed of a plurality of divided bodies, and when the thermally conductive substance is filled inside the divided bodies, the plurality of divided bodies are joined to each other. A bulb-type fluorescent lamp can be provided in which the work of filling the thermally conductive substance can be performed before and the work of filling the thermally conductive substance in the cover body is easy.

According to the second aspect of the invention, in addition to the effect of the first aspect, the electronic parts having low heat resistance on the circuit board and the inner surface of the cover are in contact with the heat conductive material. It is possible to provide a self-ballasted fluorescent lamp in which the heat effect of electronic components having low heat resistance is suppressed and the heat of the lighting circuit is efficiently radiated from the cover body to the outside.

According to the third aspect of the present invention, in addition to the effect of the light bulb type fluorescent lamp according to the first aspect, an electronic component having a large heat generation among a plurality of electronic components mounted on the circuit board and the inner surface of the cover. Since it is in contact with the heat conductive material, the heat from the electronic component with a large amount of heat is efficiently radiated to the outside, and the bulb type fluorescent lamp that can further suppress the temperature rise inside the cover body is provided. it can.

According to the fourth aspect of the present invention, in addition to the effect of the light bulb type fluorescent lamp according to any one of the first to third aspects, the heat conductive substance is made of a highly versatile silicone resin, so that heat The fluorescent bulb has a high conductivity and can be manufactured at low cost, and can be used as a fluorescent bulb.

According to the invention of claim 5, it is possible to provide a lighting fixture equipped with the light bulb type fluorescent lamp according to any one of claims 1 to 4.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a light bulb type fluorescent lamp of the present invention.

FIG. 2 is an exploded view of the bulb-type fluorescent lamp shown in FIG.

FIG. 3 is a side view showing a manufacturing process of the bulb-type fluorescent lamp of FIG.

FIG. 4 is a partially cutaway sectional view of an embodiment of the lighting fixture of the present invention.

[Explanation of symbols]

1 ... Cover body, 2 ... Base, 3 ... Holder, 4 ... Fluorescent lamp, 5 ... Lighting device, 6 ... Heat conductive resin, 7 ... Globe

Claims (5)

[Claims] 1. A bent fluorescent lamp; a holder for supporting this fluorescent lamp; a base attached to one end and a holder attached to the other end, respectively, and a direction orthogonal to a direction from one end to the other end. A cover body composed of a plurality of divided bodies divided into: a plurality of electronic components forming a lighting circuit for lighting a fluorescent lamp, mounted on a circuit board,
A lighting circuit housed in the cover body; a heat conductive substance filled inside a part of the divided body so as to contact at least a part of a plurality of electronic components of the lighting circuit and the inner surface of the cover body; A bulb-type fluorescent lamp characterized by comprising: 2. The bulb-type fluorescent lamp according to claim 1, wherein among the plurality of electronic components mounted on the circuit board, the electronic component having low heat resistance is in contact with the heat conductive substance. 3. The bulb-type fluorescent lamp according to claim 1, wherein among the plurality of electronic components mounted on the circuit board, the electronic component having a large heat generation is in contact with the heat conductive substance. 4. The bulb-type fluorescent lamp according to claim 1, wherein the heat conductive substance is a silicone resin. 5. A lighting fixture comprising: the light bulb type fluorescent lamp according to any one of claims 1 to 4; and a fixture body to which the light bulb shaped fluorescent lamp is mounted.