JP2003197004A - Compact self-ballasted fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact self-ballasted fluorescent lamp capable of easily sticking a heat conductive substance to an electronic component of a lighting circuit. <P>SOLUTION: This compact self-ballasted fluorescent lamp is provided with openings for injecting the heat conductive substance 6 from an opening part 2c of its holder 2 and an guide hole 4e of a circuit substrate 4a so as to facilitate the filling of the heat conductive substance 7 and the manufacturing, and to efficiently radiate heat from the electronic component 4d to the outside via the heat conductive substance 6 filling a base 5 and cover body 1. <P>COPYRIGHT: (C)2003,JPO

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 light bulb type fluorescent lamp, there is a concern that the temperature inside the cover body rises during lighting and the heat-resistant temperature of the electronic components forming the lighting circuit may be exceeded. As a measure against this,
For example, as described in Japanese Unexamined Patent Publication No. 5-250905, in order to prevent the temperature inside the cover from rising due to heat generation of the lighting circuit, the lighting circuit, the case, the holder, and the globe are respectively joined by a silicone adhesive, There is known a technique for radiating the heat of the heat from the cover and the globe through the heat conductive substance.

[0003]

The above-mentioned prior art is a structure in which the heat conductive resin flows into the lighting device through the opening formed in the holder edge. Therefore, there is a problem that it is difficult to fill the heat conductive resin so that the heat conductive resin surely contacts the electronic component, and the work of filling the heat conductive resin is complicated.

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 in which a heat conductive resin can be easily attached to electronic parts of a lighting circuit.

[0005]

According to a first aspect of the present invention, there is provided a self-ballasted fluorescent lamp having a bent fluorescent lamp, a plurality of electronic components constituting a lighting circuit for lighting the fluorescent lamp, and the electronic components mounted thereon. And a lighting device having a circuit board on which an introduction hole is formed;
A cover body that houses the lighting device such that a surface on which a plurality of electronic components are mounted faces the base side; a base portion that supports the fluorescent lamp, and an opening formed so as to face the introduction hole of the lighting device. A holder disposed on the non-base side of the cover body; injected into the cover through the opening of the holder and the introduction hole of the circuit board, and at least a part of a plurality of electronic components of the lighting circuit is covered. And a heat conductive material filled so as to come into contact with the inner surface of the cover body.

[0006] The heat conductive substance means a substance having a higher heat conductivity than air and formed of a viscous body having a certain fluidity before curing.

Further, the fluorescent lamp has a single straight bulb U
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 adjacent ends of two straight pipe valves with a connecting pipe. Further, a fluorescent lamp may be constructed by joining a plurality of bulbs having these bent portions.

The introduction hole of the circuit board is a hole penetrating the circuit board, and its shape is not particularly limited as long as the heat conductive substance can be introduced.

The holder has a base for supporting the fluorescent lamp, and an opening is formed in the base. The base has a structure that supports the fluorescent lamp,
The fluorescent lamp is fixed to the base with an adhesive or the like. Also,
The shape of the opening formed in the base is not particularly limited as long as the heat conductive substance can be introduced, but it is preferable to make it as small as possible so as not to impair the support strength and appearance of the fluorescent lamp.

The holder is generally mounted in the opening provided on the non-base side of the cover body, but the opening of the base portion and the introduction hole of the circuit board have a relationship of facing each other. If so, it may be formed integrally with the cover body.

The heat conductive material is filled in the cover body through the opening of the base portion and the introduction hole of the circuit board and is attached to a part of a plurality of electronic parts of the lighting device. A filling nozzle may be inserted into the introduction hole to fill the heat conductive substance in the cover body.

The heat conductive substance may be filled from the side of the base before attaching the base to the cover, but it is preferable to fill the cover after attaching the base. This is because the electrical connection between the lighting device and the base is not completed before the base is attached, and the electric wiring connecting the lighting device and the base may be defective due to the filling of the heat conductive substance. is there. Further, since the wiring member for electrical connection is close to the portion of the cover body to which the base is attached, the work of filling the heat conductive substance becomes complicated.

According to another aspect of the present invention, in the bulb-type fluorescent lamp, at least a part of the electronic components mounted on the circuit board of the lighting device is attached to the holder, and the heat conductive substance contacting the inner surface of the cover body is held in the holder. Since it is filled through the opening part of the cover and the introduction hole of the circuit board, the heat in the cover body is efficiently radiated to the outside through the heat conductive substance, and the temperature rise in the cover body is suppressed and It becomes possible to fill the thermally conductive substance after the holder and the base are attached, which facilitates the manufacturing.

According to a second aspect of the present invention, the light bulb type fluorescent lamp is characterized in that the heat conductive substance is filled at least from the inside of the base to the surface side of the circuit board on which electronic components are mounted.

The circuit board surface is the surface on the base side on which electronic parts are mounted. Since at least the contact portion of the base is made of metal, it has a relatively high thermal conductivity, so that the heat dissipation effect can be enhanced by conducting the heat of the lighting device to the base.

According to the bulb-type fluorescent lamp of the second aspect, since the heat conductive substance is filled inside the base, the heat in the cover can be radiated through the base having a high heat radiating action, and the temperature rise of the cover can be further improved. It becomes possible to suppress.

A light bulb shaped fluorescent lamp according to a third aspect of the present invention is characterized by comprising the light bulb shaped fluorescent lamp according to the first aspect; and a main body of an instrument on which the light bulb shaped fluorescent lamp is mounted. is there.

According to the lighting equipment of the third aspect, it is possible to provide the lighting equipment provided with the bulb-type fluorescent lamp having the action of the invention of the first or second aspect.

[0019]

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 a compact fluorescent lamp of the present invention, and FIG. 2 is an exploded view of FIG. In addition, in the assembly and exploded view of FIG. 2, the illustration of the gloves is omitted.

The cover 1 of the bulb-type fluorescent lamp is made of a heat-resistant synthetic resin such as polybutylene terephthalate (PB).
T) and the like, the upper end of which is a cylindrical portion 1 covered with a base.
It has a substantially bowl-shaped rotating body shape having an opening a on the lower end side, which has an opening a on the lower side. On the inner surface inside the opening of the cover body 1, a plurality of engagement recesses 1c are formed around the periphery thereof.

On the lower side of the cover body 1, there is mounted a holder 2 having a base portion 2a formed of a heat-resistant synthetic resin such as PBT resin in a substantially disc shape. Several mounting holes 2b for mounting the fluorescent lamps 3 are formed circumferentially around the opening of the cover body 1 at equal intervals. A circular opening 2c for filling a silicone resin 7 as a heat conductive substance having a diameter of about several millimeters is formed in a portion surrounded by the mounting hole 2b. Further, a side wall is formed on the peripheral edge of the holder 2 so as to rise from the base portion 2a. Further, the holder upper side wall 2d is formed with a plurality of engaging claws 2e which are engaged and fixed to the engaging concave portions 1c on the inner surface of the cover body 1.

The fluorescent lamp 3 is constructed by joining three bending bulbs 3a. The top of each bending valve 3a is
It is smoothly bent into a U-shape in the middle part and is arranged at equal intervals on the circumference centered on the central axis whose longitudinal direction is the vertical direction of the bulb-shaped fluorescent lamp, and the straight pipe part of each bulb 3a. Is also configured to be arranged at equal intervals on the circumference centered on the central axis of the bulb-shaped fluorescent lamp. That is,
The bent portion of each bending valve 3a is arranged corresponding to each side of the substantially triangular shape. A phosphor layer is formed on the inner surface of each bending bulb 3a, and a rare gas such as argon and mercury are enclosed as an enclosure gas in the bulb 3a.
In the three bulbs 3a, one continuous discharge path is formed by the communication pipe 3b connecting the respective bulbs.
At the ends of the fluorescent lamp 3 located at both ends of this discharge path,
A pair of electrodes is sealed.

The ends of the bulb 3a of the fluorescent lamp 3 are inserted into the lamp mounting holes 2b formed in the holder 2,
The end portion of the bulb 3a and the lamp mounting hole 2b are adhesively fixed with silicone resin or the like. As a result, the fluorescent lamp 3
Are supported by the holder 2.

A lighting device 4 is arranged on the surface 4b of the holder 2 on which the fluorescent lamp 3 is not mounted. This lighting device 4
The fluorescent lamp 3 is provided with a disk-shaped circuit board 4a arranged on a parallel surface orthogonal to the longitudinal direction, and a plurality of electronic components 4d are mounted on both surfaces of the circuit board 4a, that is, the upper surface 4b which is the base 5 side. Thus, an inverter circuit for performing high frequency lighting is configured. Components such as an electrolytic capacitor and a film capacitor having relatively weak heat resistance are also mounted on the plurality of electronic components 4d. A resonance inductor is arranged at the center of the circuit board 4a. An electrolytic capacitor is arranged above the resonance inductor. A part of the electrolytic capacitor is covered with the cover body 1 while being erected on the circuit board 4a.
It is stored in the upper cylindrical portion 1a. In addition, on the lower surface 4c of the circuit board 4a, a chip-shaped REC (rectifier, rectifying element, diode bridge), transistor, resistor, or other package having a relatively large heat resistance and a small thickness, has a thickness of 2-3 mm. Parts that are formed to some extent are mounted.

An introduction hole 4e having a diameter of several millimeters is formed through the circuit board at a position corresponding to the opening 2c of the holder 2. The introduction hole 4e is formed so as to avoid the electronic component 4d and the circuit pattern mounted on both surfaces 4b and 4c of the circuit board. A lead wire (not shown) led out from the circuit board 4a is wired in the gap between the electrolytic capacitor and the cylindrical portion 4a and connected to the base 5.

On the side of the holder 2 where the fluorescent lamp 3 is not mounted, the lighting device 4 is attached by pushing the circuit board 4a so that the peripheral edge of the circuit board 4a engages with the inside of the engaging claw 2e.

Next, a manufacturing and assembling process of the compact fluorescent lamp of this embodiment will be described.

First, the holder 2 to which the fluorescent lamp 3 and the lighting device 4 are attached as described above is prepared, and the holder 2 is inserted from the opening of the cover body 1 to the inner surface of the lower side of the cover body 1. The plurality of engaging recesses 1c and the engaging claws 2e formed on the holder 2 are fitted and fixed. And the cover body 1
The cylindrical portion 1a is covered with the base 5, and the lead wire led out from the circuit board 2a and the base 5 are connected. And the base 5
The base 5 is attached to the cover body 1 by caulking. Next, the base 5 is placed on the lower side and the fluorescent lamp 3 is placed on the upper side, that is, the opening 2c formed in the holder 2 faces upward. In this state, the silicone resin 7 as a heat conductive substance is injected into the cover body 1 through the opening 2c and the introduction hole 4e of the circuit board 2a. As a result, the silicone resin 7 injected from the openings 2c and the introduction holes 4e according to gravity is filled almost entirely in the cover body 1 from the bottom of the base 5 to the surface of the circuit board 4b. . As described above, the filling work is facilitated by filling the silicone resin 7 after the base 5 is attached to the cover body 1.

Finally, the peripheral edge portion 1b of the opening of the cover body 1 and the peripheral edge portion 6a of the globe opening are joined and fixed by adhesion with an adhesive such as a silicone resin.

Although the bulb-type fluorescent lamp of the above embodiment has the globe 6 that covers the fluorescent lamp 3, the globe 6 may not be provided.

With the above structure, when the lighting device 4 for the compact fluorescent lamp is powered on, a starting voltage is applied between the pair of electrodes of the fluorescent lamp 3 by the lighting circuit, and the fluorescent lamp 3 starts discharging. The compact fluorescent lamp lights up.

As described above, while the light bulb type fluorescent lamp is lit, the lighting device 4 generates heat and the temperature in the compactly housed cover body 1 rises to some extent, but heat is radiated from the base 5 and the entire cover body 1. As a result, the heat radiation area is widened and heat can be efficiently radiated to the outside through the silicone resin 7. Thereby, the influence of the heat of the electronic component 4d is suppressed, and by protecting the plurality of electronic components 4d, it becomes possible to provide the highly reliable lighting device 4. 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.

Further, since the heat conductive substance 7 is filled after the base 5 is mounted, the heat conductive substance 7 is filled in the cover body 1 without affecting the electrical connection between the lighting device 4 and the base 5. And the filling work becomes easy.

In the above embodiment, the opening 2c of the holder 2 is used.
However, the cylindrical portion reaching from the opening 2c to the circuit board surface 4a may be integrally provided on the inner surface of the base portion 2a of the holder 2. By thus providing the cylindrical portion on the inner surface of the base portion 2b, the work of filling the heat conductive substance 7 is facilitated, and even when the heat conductive substance 7 overflows from the circuit board introduction hole 4e, the fluorescent lamp It is possible to prevent the circuit board 4c on the third side from being filled with the thermally conductive substance 7.

The opening 2c of the holder 2 may be covered with a heat conductive substance 7 or the like. By doing so, the waterproofness of the bulb-type fluorescent lamp can be improved and the appearance thereof can be improved. It doesn't hurt.

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

In the figure, reference numeral 31 is a bulb-type fluorescent lamp.
Reference numeral 0 denotes an embedded lighting fixture body, and the fixture body 30 includes a base 32, a socket 33, and a reflector 34.

[0039]

According to the first aspect of the present invention, the heat conductive substance which is adhered to at least a part of the electronic components mounted on the circuit board of the lighting device and which is in contact with the inner surface of the cover body is used. Since it is filled through the opening of the holder and the introduction hole of the circuit board, the heat in the cover body is efficiently radiated to the outside through the heat conductive material, and the temperature rise in the cover body is suppressed, A heat-conducting substance can be filled after the holder and the base are attached, and a bulb-type fluorescent lamp that can be easily manufactured can be provided.

According to the second aspect of the present invention, since the heat conductive substance is filled inside the base, the heat in the cover can be radiated through the base having a high heat dissipation effect, and the temperature rise of the cover can be further suppressed. It is possible to provide a self-ballasted fluorescent lamp capable of

According to the third aspect of the present invention, it is possible to provide a lighting fixture provided with the bulb-type fluorescent lamp having the action of the first or second aspect of the present invention.

[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 partial side sectional view of an embodiment of the lighting fixture of the present invention.

[Explanation of symbols]

1 ... Cover body, 2 ... Holder, 2c ... Opening part, 3 ... Fluorescent lamp, 4 ... Lighting device, 4e ... Introduction hole, 5 ... Base, 6 ... Globe, 7 ... Silicone resin

Claims (3)

[Claims] 1. A bent fluorescent lamp; a plurality of electronic components that constitute a lighting circuit for lighting the fluorescent lamp; and a lighting device having a circuit board on which the electronic components are mounted and an introduction hole is formed; With the base attached,
A cover body that houses the lighting device such that a surface on which a plurality of electronic components are mounted faces the base side; a base portion that supports the fluorescent lamp, and an opening formed so as to face the introduction hole of the lighting device. A holder disposed on the non-base side of the cover body; injected into the cover through the opening of the holder and the introduction hole of the circuit board, and at least a part of a plurality of electronic components of the lighting circuit is covered. A light-bulb-shaped fluorescent lamp, comprising: a heat-conductive substance which is attached so as to come into contact with the inner surface of the cover body; 2. The bulb-type fluorescent lamp according to claim 1, wherein the thermally conductive substance is filled from at least the inside of the base to the surface side of the circuit board on which electronic components are mounted. 3. A lighting fixture comprising: the light bulb type fluorescent lamp according to claim 1; and a fixture main body to which the light bulb shaped fluorescent lamp is attached.