JP2003203518A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire whereby temperature of a discharge lamp ballast can be effectively lowered and miniaturization/thinning can be expedited. <P>SOLUTION: A built-in discharge lamp ballast 6 fixed to a chassis 2 is provided with a ballast element (circuit module) 16 fixed to a case body while including a heating component (transformer) 32 disposed so that is can come close to the case body 13 and the inner surface of the wall part 12a of the case body or can conduct heat to them. A first heat radiating plate 41 of a radiator 9 is sandwiched between the chassis 2 and the main base wall 11a of the case body while making surface contact with them. A second heat radiating plate 42 of the radiator 9 is disposed on the outer surface of the wall part 12a facing the transformer 32 while making surface contact with it. The both heat radiating plates are connected through a heat conducting plate 43 integrally molded with them. Thereby, heat of the wall part 12a is brought to the first heat radiating plate 41 from the second heat radiating plate 42 through the heat conducting plate 43, and is emitted to the chassis 2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a lighting fixture such as a fluorescent lamp lighting fixture provided with a discharge lamp ballast for lighting a discharge lamp such as a fluorescent lamp.

[0002]

2. Description of the Related Art A discharge lamp ballast in which a ballast element having a combination of an iron core and a coil is built in a case body, and a discharge lamp ballast called a so-called electronic ballast for lighting a lamp at a high frequency by inverter control. It has been known. The electronic ballast has a configuration in which a circuit module (ballast element) having a printed wiring board on which electric components are mounted is arranged in a case body made of a metal base case and a cover case while being electrically insulated from the case body. Is equipped with.

In order to meet the demands for downsizing and thinning of lighting fixtures, particularly discharge lamp ballasts fixed to the chassis of lighting fixtures are also being downsized and thinned. for that reason,
Since the space for accommodating the ballast element is narrowed and the heat dissipation area of the case body is reduced, the temperature of the ballast element easily rises. When this temperature rises above a predetermined temperature, the function of the ballast element is likely to deteriorate.

Further, due to the thinning, electric parts which are tall and generate heat in the ballast elements, such as transformers in the case of the circuit module, are close to the inner surface of the wall of the case body or through an insulating sheet. Therefore, the temperature of the circuit module tends to rise unless the temperature of the wall portion is effectively reduced. Under these circumstances, in order to promote the thinning, there is a demand for a heat radiation technique that effectively lowers the temperature of the ballast element.

By the way, conventionally, a heat radiating plate is sandwiched between a case body provided in a discharge lamp ballast and a ballast installation component such as a chassis to which the case body is screwed. The heat sink is an aluminum plate with a U-shaped cross section.The side plates that are parallel to each other sandwich the ballast case in the width direction, and the web part that connects these side plates together is sandwiched between the case body and the chassis. Has been.

However, this heat radiating plate only absorbs the heat of the discharge lamp ballast from the side close to the chassis and radiates it to the chassis by heat conduction. for that reason,
Under the condition that the temperature is likely to rise due to the miniaturization and thinning as described above, it is becoming difficult to exhibit the necessary and sufficient heat dissipation performance, and improvement thereof is required.

In particular, in a structure such as an electronic ballast in which the case body is divided into two parts, a side closer to the chassis and a side farther from the chassis,
The thermal resistance due to the gap between the two divided cases is large. Therefore, it is difficult to effectively lower the temperature of the case portion of the case body farther from the chassis. Therefore, the conventional heat dissipation technology is not suitable for downsizing and thinning of lighting fixtures and discharge lamp ballasts.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to obtain a lighting fixture capable of effectively lowering the temperature of a discharge lamp ballast and promoting miniaturization and thinning.

[0009]

A discharge lamp lighting device according to a first aspect of the present invention includes a chassis, a case body, and a heat-generating component that is arranged close to or capable of conducting heat to an inner surface of a wall of the case body. And having a ballast element built into the case body, and fixed to the ballast housing case or the chassis in a posture in which the wall portion is separated from the chassis or a ballast housing case that is placed separately from the chassis. A discharge lamp ballast, a first heat dissipation plate sandwiched between the discharge lamp ballast and the ballast housing case or the chassis in surface contact therewith, and in surface contact with the outer surface of the wall portion. The first
A second heat radiating plate disposed so as to sandwich the discharge lamp ballast between the heat radiating plate, a discharge lamp socket attached to the chassis, and a detachably supported by the socket, the discharge lamp ballast And a discharge lamp that is turned on.

The present invention can be applied to a discharge lamp ballast in which a ballast element having a combination of an iron core and a coil is built in a case body, and a so-called electronic ballast for lighting a lamp at a high frequency by inverter control. In the present invention, the first and second
A material having excellent thermal conductivity can be used for the heat radiating plate of, and particularly, when non-ferrous metal such as aluminum and its alloy, or copper and its alloy is used, the material cost is low and extrusion molding is possible. It is preferable in that it can be easily processed, and the shape and size of these heat sinks are not particularly limited. In the present invention, it does not prevent that the first and second heat dissipation plates may be processed or improved to improve the heat dissipation performance, and the heat dissipation plates and the members that make surface contact with each other in a heat conductive manner are not disturbed. In addition, it does not prevent that a means for reducing the thermal resistance may be interposed.

In the invention of claim 1, the temperature of the discharge lamp ballast rises as the ballast element heats up. However, the heat of the discharge lamp ballast is conducted to the ballast housing case or chassis to which the case body is fixed and is radiated through the first heat radiating plate sandwiched between the ballast and the case body. It Further, the wall portion of the case body that is distant from the ballast housing case or the chassis is heated by the heat generating component that is arranged close to or capable of conducting heat, but the heat of this wall portion causes the second heat radiating plate to move. It is discharged to the outside of the discharge lamp ballast via the. for that reason,
As described above, although the heat-generating component is arranged close to the wall of the case body or capable of heat conduction and the discharge lamp ballast is formed in a thin shape, the temperature rise of this ballast is effectively suppressed. Therefore, the temperature can be maintained below a predetermined temperature so that the function of the ballast element can be exerted.

According to a second aspect of the present invention, the case body according to the first aspect is a combination of a base case that contacts the first heat radiating plate and a cover case that contacts the second heat radiating plate. It is characterized in that the first and second heat radiation plates are connected to each other via a heat conduction plate integrally formed therewith.

In this case, a heat conducting plate having a U-shaped cross section can be formed by integrally connecting the first and second heat radiating plates on one side in the width direction, or by using the heat conducting plate. It is also possible to integrally connect the widthwise opposite sides of the first and second heat radiating plates to form a tubular, for example, rectangular tubular, radiator. Further, in the case where the radiator has a U-shaped cross section as described above, the first and second radiator plates may be formed so as to elastically sandwich the discharge lamp ballast in the thickness direction thereof. When adopting, the adhesion of the first and second heat radiating plates to the base case and cover case of the discharge lamp ballast is enhanced by the elastic force of the heat radiating body.

According to the second aspect of the present invention, despite the large thermal resistance between the base case and the cover case,
Not only the heat of the cover case can be released to the outside of the discharge lamp ballast by the second heat radiating plate, but also the heat of the cover case can be conducted to the first heat radiating plate via the heat conducting plate and radiated to the ballast housing case or chassis. it can.

According to a third aspect of the present invention, at least the second heat radiating plate of the first and second heat radiating plates according to the first or second heat radiating plate has a ballast contacting surface or a ballast non-contacting side opposite to this surface. At least one of the contact surfaces is painted. In this invention, black coating is preferable,
Other colors may be applied.

In the present invention, when at least one surface of the first heat dissipation plate is coated, the coating of the adhesion to the ballast housing case or chassis that contacts the painted surface or the discharge lamp ballast. Can be increased by
Due to the heat absorbing property and heat releasing property of the coating film, the thermal resistance between the coated surface and the ballast housing case or chassis in contact with the surface, or the discharge lamp ballast can be reduced. Further, when at least one surface of the second heat dissipation plate is coated, the closeness and thermal resistance between the discharge lamp ballast and the second heat dissipation plate can be reduced, or the second heat dissipation plate is exposed to the outside. Heat release can be accelerated.

According to a fourth aspect of the present invention, a display portion for indicating a name is provided on an outer surface of the wall portion away from the ballast accommodating case or the chassis according to any one of the first to third aspects. The second heat dissipation plate has means for visually recognizing the display unit.

In this case, the second means for visually recognizing the display section is the second.
Notches and openings for exposing the display unit can be provided on the heat dissipation plate, or the entire second heat dissipation plate or at least a portion covering the display unit may be formed of a semitransparent material. Silicon rubber or the like is used as the semi-transparent material having heat absorption and heat dissipation. Further, when the notch or the opening is used as the display unit visual confirmation means, at least the second heat dissipation plate can be formed of alumina-containing silicon mixed with alumina powder. Since it has excellent heat dissipation and therefore excellent thermal conductivity, it can be suitably used as the second heat dissipation plate or heat dissipation member.

In the present invention, the name of the display content of information for managing the discharge lamp ballast during manufacturing can be visually recognized as necessary without being obstructed by the second heat radiating plate.

According to a fifth aspect of the present invention, an electric wire wired along the chassis is provided between the discharge lamp ballast according to any one of the first to fourth aspects and the second heat radiating plate. A holding means is formed.

In this case, as a means for holding the electric wire, a tunnel-shaped space through which the electric wire is passed may be formed between the corner portion formed by the second heat radiating plate and the heat conducting plate and the discharge lamp ballast. Alternatively, as a means for holding the electric wire, a gap is formed between the side edge portion of the second heat radiating plate in the width direction and the discharge lamp ballast, which is open to the side of the ballast and through which the electric wire passes. At the same time, a line support that can be bent toward the discharge lamp ballast can be provided at the side edge portion.

According to the fifth aspect of the present invention, when the discharge lamp ballast is fixedly installed on the chassis, the electric wire in the device wired along the chassis is provided between the second heat radiating plate and the heat conducting plate. It can be held through the formed electric wire holding means.

[0023]

DETAILED DESCRIPTION OF THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

Reverse Fuji type fluorescent lamp luminaire 1 shown in FIG.
Is provided with an elongated box-shaped steel plate chassis 2 having an open lower surface. The chassis 2 is fixed to a fixture installation wall (not shown) such as a ceiling, and is covered with a reflection plate 3 having a V-shaped cross section that is fixed to the chassis 2. As shown in FIG. 2, a fluorescent lamp socket 4 as a discharge lamp socket is attached to each of the socket attachment fittings 2a of the chassis 2 having both longitudinal end portions thereof. Penetrates through. Inside the chassis 2, a power supply terminal block 5 and a lighting device 7 including a discharge lamp ballast 6, which is a so-called electronic ballast, are housed. A straight tube type fluorescent lamp 8 as a discharge lamp which is turned on by the discharge lamp ballast 6 is arranged on the lower side of the reflector plate 3 so that both longitudinal ends thereof are detachably supported by the lamp socket 4.

As shown in FIGS. 3 to 6, the lighting device 7 includes:
The discharge lamp ballast 6 and the radiator 9 are provided. The discharge lamp ballast 6 includes a case body 13 as a ballast case formed by assembling a base case 11 and a cover case 12, insulating sheets 14 and 15 on the base side and the cover side, and ballast elements by inverter control, for example. And a circuit module 16 for controlling lighting by performing power conversion.

The case body 13 is formed in the shape of a relatively elongated box-shaped container. The aluminum alloy base case 11 includes a flat base main wall 11a and mutually parallel base side walls 11b that are bent in the same direction from both sides in the width direction of the base main wall 11a and project from one side of the base main wall 11a. And has a U-shaped cross section.

As shown in FIG. 6, fixing holes 17 are formed at both ends in the longitudinal direction of the base main wall 11a. By screwing a nut 19 into a screw 18 that passes through the case main wall 11a through these fixing holes 17 and tightening the screw 18, the discharge lamp ballast 6 is fixed to the chassis 2 together with the radiator 9. It The heat generated in the discharge lamp ballast 6 in this mounted state is conducted to the chassis 2 to be released.

As shown representatively in FIG. 3, the base main wall 11
A pair of end substrate supports 21 standing inside the base case 11 are cut and raised at both ends in the longitudinal direction of a.
An intermediate substrate support 22 (see FIGS. 4 and 5) that is located at the center portion in the width direction and stands upright inside the base case 11 is cut and raised in the middle portion in the longitudinal direction of the base main wall 11a.

Cover case 12 made of aluminum alloy
3 to 5, etc., the cover main wall 12a, the cover side walls 12b parallel to each other, which are bent from both sides in the width direction of the cover main wall 12a to the same side and project to one side of the cover main wall 12a, and It has a cover end wall 12c (only one is shown in FIG. 3) bent from both ends in the longitudinal direction of the cover main wall 12a. The cover main wall 12a is formed of a flat plate-shaped wall portion provided in parallel with the base main wall 11a, and an inclined portion 12bb that connects the wall portion and the cover side wall 12b and is inclined in opposite directions.

An inward stopper protrusion 24 is formed on each of the pair of left and right cover side walls 12b provided on the outer surface of the base side wall 11b, as shown in FIG. Correspondingly, the respective stopper protrusions 24 are hooked by entering from above the stopper grooves (not shown) which are notched in the upper edge of the base side wall 11b. As a result, the depth at which the cover case 12 is fitted into the base case 11 (fitting depth) is defined, and the cover case 12 is defined so as not to move along the longitudinal direction of the base case 11. ing.

In this combined state, both cases 11 and 12 are
Are connected by connecting means (not shown) to form the case body 13. As shown in FIG. 6, the total length of the cover case 12 is shorter than the total length of the base case 11. As a result, when the cover case 12 is connected to the base case 11, the fixing hole 17 is exposed so as not to hinder the screwing to the chassis 2.

A display portion 25 is provided on the outer surface of the cover main wall 12a of the cover case 12 so as to be close to one longitudinal end of the case 12. The display unit 25 includes the discharge lamp ballast 6
Is a label having information for managing information on its manufacture, etc., and can be engraved and displayed by irradiating with a laser beam, but in the present embodiment, a so-called name plate is used. It is attached using a heat resistant adhesive that does not.

The display section 25 is an output circuit section 16b described later.
Is provided at a position as far as possible from, preferably corresponding to an input circuit section 16a described later. With such an arrangement, the display unit 25 is less likely to be affected by the heat generation of the transformer 32 of the output circuit unit 16b, which will be described later. According to this configuration, since an adhesive having a low heat resistance grade can be used as the adhesive for attaching the display unit 25 to the cover case 12, it is advantageous in that the cost can be reduced accordingly.

The base side insulating sheet 14 is formed of an electric insulating material such as Lumirror (trade name). This sheet 14 is housed in the base case 11 without covering the fixing holes 17 so as not to interfere with the attachment of the discharge lamp ballast 6 to the chassis 2, and as shown in FIGS. Is provided to cover the inner surface of the. The base side insulating sheet 14 is provided with a positioning hole (not shown) through which the intermediate substrate support 22 is inserted and a notch (not shown) opposed to the stopper groove (not shown) while being arranged in the base case 11. ing.

The cover side insulating sheet 15 is also made of an electric insulating material such as Lumirror (trade name). The sheet 15 is housed in the cover case 12 without covering the inner surface of the cover end wall 12c, and is arranged so as to cover the inner surface of the cover case 12 as shown in FIGS. 4 and 5.

As shown in FIGS. 4 to 6, the circuit module 16 has a printed wiring board 31 having a component mounting surface on one side and a wiring layer on the other side, and a transformer 3 as a heat generating component.
2, the switching transistor 34, and other various electric parts 35, the input electric wire connector 36, the output electric wire connector 37, etc. are mounted to form an inverter type lighting circuit.

As shown in FIG. 6, an input circuit section 16a to which commercial AC power is applied is formed through the input electric wire connector 36 by various electric parts arranged at one longitudinal end of the circuit module 16. . Circuit module 16
By various electrical parts arranged at the other end in the longitudinal direction of
An output circuit portion 16b connected to the fluorescent lamp socket 4 via an electric wire connector for output 37 and an insulating coated electric wire.
Are formed. The transformer 32 is included in the electric components forming the output circuit section 16b, and the height of these transformers is the highest among the electric components mounted on the printed wiring board 31. The input circuit unit 16 is provided at the center in the longitudinal direction of the circuit module 16 located between the two circuit units 16a and 16b.
A switching transistor 34, which is a power conversion circuit component that converts the direct current generated in a into a high frequency, is arranged. The transistor 34 generates heat due to its operation.

The circuit module 16 has the other surface, on which the leads of various electric components are soldered to the wiring layer, on the base main wall 11a.
It is housed in the base case 11 toward. In this housing, the printed wiring board 31 is positioned at a predetermined position by the board supports 21 and 22 of the base case 11. or,
The printed wiring board 31 is fixed so as not to move in the vertical direction by bending the nails or the like accompanying the assembly of the case body 13.

Circuit module 16 and both insulating sheets 1
In a state where both cases 11 and 12 are assembled to accommodate 4 and 15, both side edges of the base-side insulating sheet 14 interposed between the base case 11 and the circuit module 16 and the leading edge in the width direction, Cover case 12 and circuit module 1
6 and the both sides of the cover-side insulating sheet 15 in the width direction interposed between the insulating sheet 14 and the insulating sheet 14,
15 is continuous in a substantially cylindrical shape. As a result, the circuit module 16 is insulated from the case body 13.

Due to the regulation of the fitting depth of the cover case 12 with respect to the base case 11 described above, the tip of the electric component such as the transformer 32 having the highest height is brought close to the inner surface of the cover main wall 12a or is insulated. It is designed to be arranged so that heat can be conducted through the sheet 15. Thereby, the thickness of the case body 13 is made small, that is, the discharge lamp ballast 6 is formed in a thin shape, and accordingly, the height of the chassis 2 can be made low, and thus the lighting fixture 1 can be made thin. There is.

Among the above-mentioned electric parts, the base case 1 is representatively shown in FIG.
The heat releasing means to 1 is adopted. The heat releasing means is formed of a material having excellent electric insulation and thermal conductivity, for example, a heat releasing piece 38 made of silicon containing alumina. This piece 38 corresponds to the position where the transformer 32 is mounted, for example, the printed wiring board 31 and the base main wall 11.
The transformer 39 is installed so as to be tightly sandwiched between it and a, and the lead 39 of the transformer 32 is inserted to a height position in the middle in the thickness direction.

By using the heat-dissipating piece 38 as described above, the heat generated in the transformer 32 is passed through the lead 39 and directly taken out to the heat-dissipating piece 38, and the base case 11 is cut from the piece 38 through the insulating sheet 14. It is possible to conduct heat to the base main wall 11a. In this case, if the insulating sheet 14 is provided with a hole having a size that allows the heat releasing piece 38 to escape, the heat releasing performance can be further improved. When both the heat radiating means and the heat radiating body 9 described below are used together, the temperature rise of the discharge lamp ballast 6 can be more effectively suppressed, so that the operating conditions are severe in terms of temperature. Even if there is, the discharge lamp ballast 6 can be preferably used.

The heat radiating body 9 is obtained by extruding a non-ferrous metal excellent in heat radiating property and workability, for example, an aluminum alloy, and as shown in FIGS. 3 to 5, the first heat radiating plate 41 is formed. And a second heat dissipation plate 42 and a heat conduction plate 43 integrally connecting the one side in the width direction with each other, and the second heat dissipation plate 42 is formed in a substantially U-shaped cross section. The heat radiator 9 can also be formed of a synthetic resin material such as silicon rubber or alumina-containing silicon. The widths of the first and second heat dissipation plates 41 and 42 are substantially the same as the width of the discharge lamp ballast 6, and the width of the heat conduction plate 43 is substantially the same as the thickness of the discharge lamp ballast 6.

This radiator 9 is fitted and attached to the discharge lamp ballast 6 from its side, and this attachment causes the first radiator plate 41 to make surface contact with the outer surface of the base main wall 11a as shown in FIG. Then, the second heat dissipation plate 42 comes into surface contact with the outer surface of the cover main wall 12a. The heat conducting plate 43 does not have to be in contact with the discharge lamp ballast 6, but as a more preferable example, in this embodiment, it is in surface contact with one cover side wall 12b located in the fitting direction.

In order to enhance the close contact between the first and second heat radiating plates 41 and 42 with respect to both outer surfaces of the case body 13 in the thickness direction, when the heat radiating body 9 is in the free state, as shown in FIGS. The first and second heat radiating plates 41 and 42 are slightly tilted so that their tip ends approach each other. As a result, when the radiator 9 is fitted in the discharge lamp ballast 6, the first and second radiator plates 41 and 42 are elastically deformed. Therefore, the plates 41 and 42 elastically sandwich the discharge lamp ballast 6 in the thickness direction thereof, so that the mutual contact can be enhanced and the thermal resistance can be reduced.

At least the first radiator plate 41 in the radiator 9
The length of the base case 11 is the same as that of the cover case 12.
Is shorter than the length, and more specifically, shorter than the distance between the fixing holes 17 at both ends of the base case 11. As a result, when the discharge lamp ballast 6 to which the radiator 9 is attached is screwed to the chassis 2, the first radiator plate 41 does not get in the way. The first heat dissipation plate 41 may have substantially the same length as the base case 11, but in that case, holes communicating with the fixing holes 17 are provided at both ends of the first heat dissipation plate 41 in the longitudinal direction. The radiator 9 may be positioned with respect to the discharge lamp ballast 6 so as to properly face the fixing hole 17.

As shown in FIGS. 3 and 6, the second heat dissipation plate 42
A notch 45 is formed at one end in the longitudinal direction as a means for visually recognizing the display unit 25. Instead of the notch 45, an opening may be provided to form the display unit visual recognition means. By providing such a notch 45, the name (display unit 25) having the display content of information for managing the discharge lamp ballast 6 in manufacturing or the like is not disturbed by the second heat dissipation plate 42. , Visible as needed. Therefore,
Despite covering the discharge lamp ballast 6 with the radiator 9, there is no need to support the management of the discharge lamp ballast 6 or the like.

As described above, since the cover side wall 12b of the cover case 12 has the inclined portion 12bb, when the radiator 9 is attached to the discharge lamp ballast 6, as shown in FIG. 2 A tunnel-shaped gap G is formed as an electric wire holding means between a corner formed by the heat dissipation plate 41 and the heat conduction plate 43 and the inclined portion 12bb covered by the corner. Insulation-coated electric wires 46 wired along the chassis 2 are passed through the gap G in the longitudinal direction of the discharge lamp ballast 6. Therefore, in order to hold the insulation-coated electric wire 46 along the chassis 2, for example, the chassis 2 is processed to hold the electric wire,
Alternatively, attaching an electric wire holder to the chassis 2 can be omitted or reduced.

At least one of the first and second heat radiating plates 41 and 42, at least one of the ballast contact surface of the second heat radiating plate 42 and the ballast non-contact surface opposite to this surface, is coated. It is covered with a coating film formed by. Therefore, as shown in FIGS. 4 and 5, in this embodiment, the entire inner surface and outer surface of the radiator 9 are coated. For convenience of explanation, the coating film on the inner surface of the radiator 9 is referred to as an inner coating film 47, and the coating film on the outer surface of the radiator 9 is referred to as an outer coating film 48, which will be distinguished below. A black paint is preferably used as the paint forming the coating films 47 and 48.

The discharge lamp ballast 6 and the radiator 9 fitted to the outer surface thereof form a lighting device 7, which is, as described above, a screw 18 passing through the fixing hole 17 of the base case 11.
Also, the discharge lamp ballast 6 is fixed by the transformer 32 in a posture in which the cover main wall 12a heated directly by the transformer 32 is connected to the chassis 2 by using a nut 19 screwed to the chassis 2. It Due to this fixing, as shown in FIGS. 4 and 5, the first radiator plate 41 of the radiator 9 is
Both the inner and outer surfaces are in surface contact with the chassis 2 and the base case 11 of the case body 13 of the discharge lamp ballast 6, respectively, and are sandwiched between them. The first heat radiating plate 41 to which a tightening force is particularly applied by the sandwiching is formed on the outer surface coating film 4 thereof.
8 improves the close contact with the chassis 2 and
The inner coating film 47 can improve the close contact with the base main wall 11a and reduce the thermal resistance between them.

When the luminaire 1 having the above-described structure is turned on, the transformer 32 and the switching transistor 34 among the electric parts included in the circuit module 16 generate particularly large heat. Along with that, both cases 11 and 12 that form the case body 13 are heated by direct heat conduction and radiant heat to them, but the heat of the case body 13 is not only emitted by heat radiation to its surrounding space but also , Is mainly conducted to the chassis 2 and discharged as follows. Therefore, it is possible to suppress the temperature rise of the electric parts of the discharge lamp ballast 6, particularly the electric module included in the circuit module 16, and to make the discharge lamp ballast 6 exhibit the desired performance.

Specifically, the heat of the base case 11 passes from the main wall 11a of the base case 11 through the first heat dissipation plate 41 to the chassis 2
It is released by conducting heat. On the other hand, the heat of the cover case 12 heated by the transformer 32 is transferred from the cover main wall 12a to the second side because the transformer 32 is arranged at a close distance or in a heat conductive manner with respect to the cover main wall 12a. The heat is conducted to the heat dissipation plate 42, and is further conducted to the first heat dissipation plate 41 via the heat conduction plate 43. In addition, in the present embodiment, one cover side wall 12b of the cover case 12 is in surface contact with the heat conducting plate 43, so that the heat of the cover case 12 passes through the heat conducting plate 43 from the cover side wall 12b. 1 Heat is conducted to the heat sink 41. Then, the first heat dissipation plate 41
The heat of the cover case 12 that has been conducted to the heat dissipation plate 4 is
The heat is conducted from 1 to the chassis 2 and discharged.

The heat release to the chassis 2 through such a heat conduction path can suppress the temperature rise of the discharge lamp ballast 6. Particularly, the base case 11 and the cover case 12 are fitted to each other, and the heat resistance due to the fitting gap (gap) between the side walls 11b and 12b is large,
Moreover, despite the condition that the cover case 12 is heated by the transformer 32 or the like, the heat of the case 12 can be transferred to the first heat dissipation plate 41 by the heat conduction plate 43 and released to the chassis 2.

Therefore, the temperature rise of not only the base case 11 but also the cover case 12 can be effectively suppressed, and the temperature rise of the entire discharge lamp ballast 6 can be suppressed. Of course, in addition to such heat dissipation by heat conduction,
Since heat is radiated from the second heat radiating plate 42 and the heat conducting plate 43 to the surrounding space, it is naturally possible to expect a temperature decrease due to this. Moreover, in this embodiment, since the heat release piece 38 is provided as described above, the piece 38 can absorb heat from the heat generating component such as the transformer 32 and release the heat to the base case 11 by heat conduction. The temperature itself of the transformer 32 and the like can be suppressed low, and therefore, the temperature rise of the discharge lamp ballast 6 can be suppressed more effectively as a whole.

As described above, although the heat-generating components such as the transformer 32 and the cover case 12 are arranged at a close distance and the discharge lamp ballast 6 is made thin, the ballast 6 there is provided.
It is possible to effectively suppress the temperature rise. Therefore, it is possible to promote downsizing and thinning of the lighting fixture 1 in which the discharge lamp ballast 6 is incorporated.

Further, the black coating films 47 and 48, which cover the inner and outer surfaces of the radiator 9 having the above-mentioned structure, respectively have a heat absorbing function and a heat radiating function, so that the temperature rise of the discharge lamp ballast 6 is further suppressed. To help.

That is, the coating films 47 on the inner and outer surfaces of the first heat dissipation plate 41 sandwiched between the base main wall 11a and the chassis 2,
In addition to being effective in reducing the thermal resistance as described above, 48 absorbs heat in the inner coating film 47 of the first heat dissipation plate 41.
The heat transfer function improves the heat transfer performance from the main base wall 11a to the first heat dissipation plate 41, and the outer coating film 48 of the first heat dissipation plate 41 absorbs and dissipates heat from the first heat dissipation plate 41 to the chassis 2. The heat transfer performance of is improved. Therefore, the base main wall 1
The heat dissipation from the 1a to the chassis 2 is improved by the heat conductivity. In addition, the second heat dissipation plate 42 that is in surface contact with the main cover wall 12a.
The main wall 12a of the cover due to the heat absorption and heat dissipation effect of the inner coating film 47 of the
From the above, the heat transfer performance of the second heat dissipation plate 42 is improved, and the second heat dissipation function of the outer coating film 48 of the second heat dissipation plate 42 causes the second heat dissipation function.
The heat radiation to the space around the heat dissipation plate 42 is improved. The same applies to the heat dissipation effect of the outer coating film 48 of the heat conducting plate 43, so that the heat radiation to the surrounding space of the heat conducting plate 43 also improves. Therefore, the temperature rise of the discharge lamp ballast 6 can be more effectively suppressed by the coating films 47 and 48 on both the inner and outer surfaces of the radiator 9. In the above first embodiment, a pair of radiators 9 having a U-shaped cross section are used,
The discharge lamp ballast 6 may be fitted from both sides in the width direction so as to face each other, and two heat dissipation paths may be provided.

Since the second embodiment of the present invention shown in FIGS. 7 and 8 is basically the same as the first embodiment, the same components as those in the first embodiment are designated by the same reference numerals. The description is omitted, and the configuration different from that of the first embodiment will be described below. The configuration of the second embodiment different from that of the first embodiment is a configuration in which the discharge lamp ballast 6 holds an insulating coated electric wire 46 that is laid along the chassis 2.

More specifically, the side edge portion 42a of the second heat radiating plate 42 having a width dimension larger than that of the main cover wall 12a on the free end side in the width direction.
And the inclined portion 12bb of the cover case 12 that does not face the heat conduction plate 43, a gap G that is opened to the side of the discharge lamp ballast 6 is formed. The insulating coated electric wire 46 is accommodated in the gap G from the opened side. The direction in which the electric wire 46 is accommodated in the gap G is indicated by an arrow in FIG. 7. Then, in order to prevent the insulation-coated electric wire 46 housed in the gap G from coming off, one or more wire supports 42b are provided on the side edge portion 42a.
Is provided. As shown in FIGS. 8A and 8B, the line support 42b is formed in the shape of an elongated tongue so that it can be easily bent by a hand or the like. As shown in FIG. 7, wire support 42b,
By bending so as to approach the inclined portion 12bb of the cover case 12 that does not face the heat conduction plate 43, the insulated covered electric wire 46 in the gap G can be held.

By providing such an electric wire holding means, there is no trouble of passing the insulating covered electric wire 46 in the gap G in the axial direction thereof, and the insulating covered electric wire 46 can be moved in the radial direction to easily enter the gap G. It can be accommodated, and after that, the wire support 42b is bent to close a part of the open portion of the gap G, so that the insulated covered electric wire 4 passed through the gap G.
6 can be held so as not to fall off.

The configuration of the lighting fixture according to the second embodiment other than the points described above is the same as that of the first embodiment including the configuration not shown in FIGS. 7 and 8, and therefore,
The intended problem can be achieved also in the second embodiment.

Since the third embodiment of the present invention shown in FIG. 9 is basically the same as the first embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. However, a configuration different from that of the first embodiment will be described below. The configuration of the third embodiment different from that of the first embodiment is the configuration of the radiator 9.

Specifically, the radiator 9 is composed of the first radiator plate 41.
And a second heat radiating plate 42, and a pair of heat conducting plates 43 in which both widthwise side edges of these two plates 41, 42 are integrally connected, respectively, and are formed in a rectangular tubular shape. And the first and second
The heat radiating plates 41, 42 are curved so as to slightly project inward of the heat radiating body 9 toward the center portion in the width direction. The heat radiator 9 is fitted into the outer surface of the discharge lamp ballast 6 by being press-fitted into the discharge lamp ballast 6 from one end in the longitudinal direction, and in this fitting, the first and second heat radiation plates 41, 42 are Elastically deformed. With the radiator 9 fitted in the discharge lamp ballast 6, the first radiator plate 41 of the radiator 9 is attached to the base main wall 11
a in close surface contact with the first heat radiating plate 42 and the cover main wall 12a.
And the pair of left and right heat conduction plates 43 are in surface contact with the pair of cover side walls 12b of the cover base 12.

The structure of the lighting fixture according to the third embodiment other than the points described above is the same as that of the first embodiment including the structure not shown in FIG.
The embodiment can also achieve the intended subject. Moreover, by providing the pair of heat conduction plates 43, two heat conduction paths from the cover case 12 to the base case 11 can be secured, which is excellent in high reliability of heat conduction.

Since the fourth embodiment of the present invention shown in FIG. 10 is basically the same as the first embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. However, a configuration different from that of the first embodiment will be described below.
The fourth embodiment differs from the first embodiment in that the heat radiation means provided in surface contact with the discharge lamp ballast 6 are first and second heat radiation plates 41, 42 which are independent of each other.

More specifically, the first heat dissipation plate 41 has a web portion 41a sandwiched between the base main portion 11a and the chassis 2.
And a pair of side plate portions 41b integrally bent from both side edges thereof are formed in a U-shaped cross section. The pair of side plate portions 41b are provided in surface contact with the outer surfaces of both cover side walls 12c of the cover case 12 with elastic deformation. The second heat radiating plate 42 is a mere flat plate having a width wider than that of the cover main portion 12a, and it is attached in surface contact with the outer surface of the cover main portion 12a. The second heat radiating plate 42 can be attached to the cover case 12 using an adhesive or the like (not shown) having good thermal conductivity.

The structure of the lighting fixture according to the fourth embodiment other than the points described above is the same as that of the first embodiment including the structure not shown in FIG. Can achieve the task of the period. In this case, the heat of the cover case 12 is conducted to the web portion 41a by conducting heat through the pair of side plate portions 41b, and from there, the chassis 2 is released.
To the second heat radiating plate 42 and then to the surrounding space by heat radiation.

Since the fifth embodiment of the present invention shown in FIG. 11 is basically the same as the first embodiment, the same components as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. However, a configuration different from that of the first embodiment will be described below.
The fifth embodiment differs from the first embodiment in that the discharge lamp ballast 6 is housed and arranged in a ballast housing case that is separate from the chassis 2.

The ballast accommodating case 51 is provided with a rectangular box-shaped case body 52 having an open upper surface, and a case lid 53 covering the case body 52. These case body 52 and case lid 5
3 is made of aluminum alloy or the like. Case body 52
A lighting device 7 in which a discharge lamp ballast 6 and a radiator 9 are combined is fixed to the bottom wall of the device by screws or the like. The ballast accommodating case 51 is arranged on the back surface of a fixture installation wall 54 such as a ceiling wall on which the lighting fixture 1 is mounted. It is electrically connected.

The configuration of the lighting fixture according to the fifth embodiment other than the points described above is the same as that of the first embodiment, including the configuration not shown in FIG. 11, and therefore the fifth embodiment also has the same configuration. Can achieve the task of the period.

[0071]

According to the first aspect of the present invention, not only the first heat radiation plate that radiates the heat of the discharge lamp ballast to the ballast housing case or chassis by heat conduction but also the ballast element is provided. Since the second heat radiating plate for radiating the heat of the wall portion of the case body arranged so that the heat generating component is close to or capable of conducting heat is provided, the discharge lamp ballast is formed in a thin shape in spite of that. It is possible to provide a lighting fixture that can effectively reduce the temperature rise, and thus can reduce the size and thickness of the discharge lamp ballast along with the reduction in thickness.

According to the second aspect of the present invention, the heat of the cover case can be conducted to the first heat radiating plate via the heat conducting plate to be radiated to the ballast housing case or the chassis. It is possible to provide a lighting fixture capable of effectively lowering the temperature of the discharge lamp ballast and accelerating downsizing and thinning of the discharge lamp ballast, despite the large thermal resistance between the two.

According to the third aspect of the invention, by using the coated heat dissipation plate, the heat resistance in the heat conduction path is improved due to the closeness of the coated surface and the heat absorption and heat dissipation of the coating film. Since it becomes smaller or heat is released to the outside of the discharge lamp ballast, the temperature of the discharge lamp ballast can be effectively lowered, and a lighting fixture capable of promoting miniaturization and thinning can be provided. .

According to the invention of claim 4, although the outer surface of the discharge lamp ballast is covered with the second heat radiation plate, the name indicating the management information of the discharge lamp ballast is changed to the second heat radiation. Since it can be visually recognized without being obstructed by the plate, it is possible to provide a lighting fixture that does not come to support the management of the discharge lamp ballast and the like.

According to the invention of claim 5, since the electric wire routed along the chassis can be held by using the discharge lamp ballast and the second heat radiating plate attached to the ballast, the electric wire holding to the chassis can be held. It is possible to provide a luminaire having a simple structure by omitting or reducing the number of electric wire holders that are processed or attached to the chassis.

[Brief description of drawings]

FIG. 1A is a perspective view showing a lighting fixture according to a first embodiment of the present invention. FIG. 1B is a plan view showing the lighting fixture of FIG.

FIG. 2A is a bottom view showing the chassis of the lighting fixture of FIG. FIG. 1B is a side view showing the chassis of FIG.

3 is an exploded perspective view showing a chassis, a discharge lamp ballast, and a radiator provided in the lighting fixture of FIG.

FIG. 4 is a cross-sectional view showing a part of the lighting fixture of FIG.

5 is an exploded cross-sectional view of a lighting device included in the lighting fixture of FIG.

6 is an exploded plan view showing a lighting device included in the lighting fixture of FIG. 1. FIG.

FIG. 7 is a cross-sectional view showing a part of a lighting fixture according to a second embodiment of the present invention.

8A is a perspective view showing a radiator provided in the lighting fixture of FIG. 7. FIG. FIG. 8B is a plan view showing the periphery of the electric wire support formed on the radiator of FIG.

FIG. 9A is an exploded perspective view showing a chassis, a discharge lamp ballast, and a radiator included in a lighting fixture according to a third embodiment of the present invention. FIG. 9B is a cross-sectional view showing a part of the lighting fixture of FIG.

FIG. 10 is a sectional view showing a part of a lighting fixture according to a fourth embodiment of the present invention.

FIG. 11 is a side view showing a state in which a lighting fixture according to a fifth embodiment of the present invention is installed on a ceiling wall with a partial cross section.

[Explanation of symbols]

1 ... Lighting fixture, 2 ... Chassis, 4 ... Fluorescent lamp socket (discharge lamp socket), 6 ... Discharge lamp ballast, 7 ... Lighting device, 8 ... Fluorescent lamp (discharge lamp), 9 ... Radiator, 11 ... Base case , 12 ... cover case, 12a ... cover main wall, 13 ... case body, 16 ... circuit module (ballast element), 25 ... display section, 31 ... printed wiring board, 32 ...
Transformer (heating component), 41 ... First heat dissipation plate, 42 ... Second
Heat dissipation plate, 42b ... Wire support (electric wire holding means), 43 ... Heat conduction plate, G ... Void (electric wire holding means), 46 ... Insulated coated electric wire, 47, 48 ... Coating film, 51 ... Ballast housing case.

Claims (5)

[Claims] 1. A chassis, a case body, and a ballast element built in the case body, which includes a heat-generating component arranged close to or capable of conducting heat to an inner surface of a wall portion of the case body, A ballast housing case that is placed separately from the chassis, or a discharge lamp ballast fixed to the ballast housing case or the chassis with the wall part away from the chassis, and the ballast housing and the ballast housing. The discharge lamp ballast is sandwiched between a first heat dissipation plate which is in surface contact with the case or the chassis, and a first heat dissipation plate which is in surface contact with the outer surface of the wall portion. A second heat radiating plate, a discharge lamp socket attached to the chassis, and a discharge lamp that is detachably supported by the socket and is turned on by the discharge lamp ballast. Lighting equipment 2. The case body is a combination of a base case in contact with the first heat radiating plate and a cover case in contact with the second heat radiating plate, wherein the first and second heat radiating plates are The lighting fixture according to claim 1, which is connected via a heat conduction plate integrally formed with the lighting fixture. 3. At least one of a ballast contact surface of at least a second heat dissipation plate of the first and second heat dissipation plates or a ballast non-contact surface opposite to this surface is coated. The lighting fixture according to claim 1 or 2, characterized in that. 4. A display unit for displaying a name is provided on an outer surface of the wall portion away from the ballast housing case or the chassis, and the second heat radiating plate has means for visually recognizing the display unit. The luminaire according to any one of claims 1 to 3, which is characterized. 5. A means for holding an electric wire wired along the chassis is formed between the discharge lamp ballast and the second heat radiating plate.
The luminaire according to any one of the items.