JPS61231709A - Method for mounting ballast in lighting device - Google Patents

Abstract

PURPOSE:To contrive improvement in heat radiating property of the titled ballast by a method wherein the ballast is installed by interposing a metallic corrugated plate between rubber bushings. CONSTITUTION:An aluminum corrugated plate 8 is interposed between a pair of rubber bushings 6 and 6. Also, a device main body 1, rubber bushings 6 and 6, the bottom plate 21 of a ballast 2, rubber bushings 7 and 7, and washers 9 and 9 are superposed, and nuts 10 are cramped on the mounting screws 5 which are passed through the above-mentioned materials. The crest part 82 and the valley part 83 of the corrugated plate 8 are gradually crushed into flat form as the fastening margin increases, and they are transformed into flat shape when cramping work is finished. Accordingly, as the area of contact between the corrugated plate can be enlarged, the ballast and the main body of the device can be made larger, a high degree of heat radiating effect can be obtained, and the temperature rise of the ballast can also be suppressed effectively.

Description

[Detailed description of the invention] The present invention relates to a method for attaching a ballast in a lighting device,
In particular, the present invention relates to an appropriate method for clamping a corrugated metal plate interposed between a mounting member and a ballast.

In general, this type of lighting device is, for example, as shown in FIG. It is constructed by attaching a reflecting plate 3 to the opening with mounting screws 4.

By the way, the above-mentioned ballast has leakage characteristics, so if the ballast is installed in direct contact with the device body, the leakage magnetic flux of the ballast will leak into the device body, causing the device body to vibrate, causing many problems. In this case, resonance vibrations occur and cause unpleasant noise.

As a countermeasure against such noise, a method has been adopted in which a rubber bushing is interposed between the ballast and its mounting surface. According to this, the vibration of the device body is absorbed by the elasticity of the rubber bushing, so the problem of noise is solved.

However, on the other hand, the following problem arises. In other words, when a ballast operates, it generates heat due to iron loss, copper, etc., but if a rubber bushing is used as described above, the ballast is isolated from the main body of the device, and the heat is only dissipated by convection. As a result, heat dissipation performance deteriorates significantly. This causes problems such as an increase in the internal temperature of the ballast and deterioration of the insulation of the coil.

Therefore, an aluminum corrugated plate is interposed between the device body and the ballast attached to the device body via a rubber bushing, and this corrugated plate forms a heat conduction path connecting the ballast and the device body. is being attempted. A method of attaching a ballast in this type of lighting device will be explained with reference to FIGS. 6 and 7. In addition, in FIGS. 6 and 7, 6.7 indicates a rubber bushing, and 8 indicates an aluminum corrugated plate.

A pair of rubber bushings 6, 6 are arranged with an interval between both ends of the bottom plate 21 of the ballast 2 and the main body 1, and aluminum corrugations are placed between these rubber bushings 6, 6. A plate 8 is interposed. Then, nuts 1° are tightened into the mounting screws 5 inserted through the device main body 1, the rubber bushing 6, the bottom plate 21 of the stabilizer 2, the rubber bushing 7, and the washer 9. In this case, the width 10 of the corrugated sheet 8 in its natural state is shorter than the mutual spacing L0 between the pair of rubber bushings 6, 6, as clearly shown in FIG. 8 wave height d. is larger than the height of the rubber bushing 6. Then, tighten the mounting screw 5 and NAND 1o to attach the stabilizer 2 to the device body 1.
When the is installed, as shown in Figure 7,
The corrugated plate 8 is clamped by the device main body 1 and the stabilizer 2, and is pushed and expanded in the wave repetition direction A (lateral direction).
Both end portions 81, 81 of are in contact with the bushings 6°6, respectively. At this time, the corrugated plate 8 is compressed so that its wave height d is the same as the height of the bushing 6, and its width l is the mutual distance between the pair of bushings 6.6. It has been expanded so that it has the same dimensions.

In this way, when using a corrugated plate 8 whose width 10 in its natural state is shorter than the mutual spacing L0 between the pair of rubber bushings 6, 6, the wave height do of the corrugated plate 8 in its natural state is equal to the height of the rubber bushing 6. Even if the corrugated sheet 8 has a larger dimension than the rubber bushing 6, when the corrugated sheet 8 is clamped as described above, its lateral elongation, that is, its lateral expansion, is absorbed by the gap between the corrugated sheet 8 and the rubber bushing 6. I end up. Therefore, as shown in detail in FIG. 8, the state of contact between the peaks 82 of the corrugated sheet 8 and the bottom plate 21 of the ballast 2, and the state of contact between the troughs 83 of the corrugated sheet 8 and the main body 1 of the device are The contact area between the ballast 2 and the device main body 1 with respect to the corrugated plate 8 becomes very small.

■However, when the above-mentioned contact area is very small as in the conventional case, the heat transfer area between the corrugated plate 8, the ballast 2, and the device main body 1 also becomes small. Therefore, heat dissipation from the ballast 2 using the corrugated plate 8 as a heat conduction path is severely restricted. Therefore, although the conventional mounting method can suppress the increase in internal temperature of the ballast 2 to a certain extent compared to a structure without a corrugated plate, it is difficult to say that the suppressing effect is sufficient. For example, compared to the lighting device shown in FIG. 5, the temperature is about 5° C. higher on average.

Therefore, an object of the present invention is to provide a ballast that can improve heat dissipation by improving the contact between the corrugated plate and the ballast as well as the contact between the corrugated plate and the main body of the device and other mounting members. The purpose is to provide an installation method.

Means for solving IO problems Accordingly, in order to achieve the above object, the present invention provides a lighting device in which a ballast is attached to its mounting member via a pair of spaced apart rubber bushings. A metal corrugated plate having a width equal to or approximately the same as the mutual spacing is interposed between the rubber bushings, and while the rubber bushings prevent the corrugated plates from spreading laterally, the above The corrugated sheet is clamped by the mounting member and the stabilizer, thereby crushing the peaks and troughs of the corrugated sheet into a flat shape.

According to this invention, when attaching a stabilizer by interposing corrugated plates having substantially the same length between the rubber bushings, the peaks and valleys of the corrugated plates are crushed into a flat shape. For this reason, the contact area of the corrugated plate with the ballast and the mounting member is expanded, and heat dissipation performance is improved.

Therefore, the temperature rise of the ballast can be appropriately controlled.

Large business group Hereinafter, the present invention will be described in detail with reference to the drawings.

The corrugated plate 8 illustrated in FIG. 1 is not limited to aluminum, but other thin metal plates that are highly thermally conductive and easily deformable can be used. The width l of this corrugated plate 8 is the same as the mutual spacing L0 when the pair of rubber bushings 6.degree. 6 are spaced apart. Also, the wave height d of the corrugated plate 8
is larger than the height of the rubber bushing 6. This corrugated plate 8 is connected to a pair of rubber bushings 6 as shown in the figure.
It is interposed between ゜6. Further, the device main body 1, the rubber bushing 6, the bottom plate 21 of the stabilizer 2, the rubber bushing 7, and the washer 9 are stacked on top of each other as shown in the figure, and the nut 10 is tightened into the mounting screw 5 inserted therethrough.

While tightening the mounting screw 5 and nut 10, both ends 81 and 81 of the corrugated plate 8 are always in contact with the rubber bushing 6.
．． 6, the wave Fi caused by the above tightening
8 is prevented from expanding laterally by a pair of rubber bushings 6.6.

Therefore, the peaks 82 and troughs 83 of the corrugated plate 8 are gradually crushed into a flat shape as the tightening allowance increases, and when the tightening is completed, they are deformed into a flat shape as clearly shown in Figure 2. There is. As shown in detail in FIG. 3, the flattened portions 82a, 83a produced by this deformation come into surface contact with the bottom plate 21 of the ballast 2 and the device main body 1 with an area corresponding to the contact width W, . This surface contact area increases or decreases the tightening allowance tI! It can be easily increased or decreased by adjusting the knot. Note that the wave height d' of the corrugated plate 8 shown in FIG. 2 is the same as the height of the rubber bushing 6. Further, since the corrugated plate 8 itself has elasticity, the flat parts 82a and 83b are connected to the bottom plate 2 of the stabilizer 2.
1 and the device main body I, respectively.

In addition, the rubber bushings 6 and 7 can be made into one piece, in addition to being separate parts.
Furthermore, it is also possible to integrally add a portion that fits into the device main body.

Figures 4a and 4b show ballasts 2 of different shapes. The structure of the ballast 2 is generally such that the gap between a closed case and an element consisting of a coil and a core built into the case is filled with a compound, and screw holes 21a are formed in the bottom plate 21 as shown in Fig. 4a. Thing, No. 4b
As shown in the figure, a screw hole 21a is formed in the cylindrical case 22,
There are various types of cases, such as cases in which elements are housed in the case 22 and filled with compound. The ballast to which the present invention can be applied may be of any type, even if it is not shown in Figures 4a and 4b, as long as an increase in internal temperature adversely affects its performance. Of course, it can be anything.

Furthermore, the stabilizer can be attached to a mounting member other than the apparatus main body, in addition to being attached to the apparatus main body as in the above-described embodiment, and the present invention is similarly applicable to such devices.

Furthermore, in the above-described embodiment, the case where the width l of the corrugated plate 8 is the same as the mutual distance L0 between the pair of rubber bushings 6.6 is explained. The mutual spacing may be slightly larger than L0, or conversely, the mutual spacing may be slightly smaller than L0. In short, when the corrugated sheet is clamped by the mounting member of the device main body or the like and the stabilizer, the width may be such that the lateral expansion of the corrugated sheet is prevented by the rubber bushing from the beginning or immediately after the clamping is applied.

Next, an experimental example will be explained.

[Experimental conditions]

Material of corrugated plate: Nialuminum, Width of corrugated plate: 225U, Vertical width: 64mm, Thickness: 50μ thick, Wave bift: 8f
l, Rubber bushing diameter: 10 Tsuru, Stabilizer type: Figure 4b.

Under the above conditions, as shown in Figures 1 and 2, the ballast is attached to the equipment body using two mounting screws, and at that time, the ballast and the equipment body adjust the wave height of the corrugated plate. For comparison, the temperature rise value of the ballast was measured using the above-mentioned conventional mounting method, in which the ballast was compressed from 4N in the natural state to 2N, using the method of the present invention.

According to this experiment, when the mounting method of the present invention was used, the temperature rise value of the ballast was about 5° C. lower than when using the conventional mounting method.

As described above, according to the present invention, the surface contact area between the corrugated plate and the ballast, the main body of the device, and other mounting members can be expanded, so a high heat dissipation effect can be obtained, and the temperature of the ballast can be reduced. The rise is effectively suppressed.

Note that noise generation is suppressed by the rubber bushing.

[Brief explanation of the drawing]

Fig. 1 is an exploded assembly view for explaining the method of attaching the ballast according to the embodiment of the present invention, Fig. 2 is a side view showing the state in which the ballast is attached to the main body of the device by the above method, and Fig. 3 is the Partial side view with enlarged main parts of the figure, Figures 4a and 4b
The figure is a perspective view showing the ballast, FIG. 5 is a perspective view schematically showing the mounting part of the ballast in a lighting device, and FIG. 6 is an exploded assembly diagram for explaining a conventional ballast mounting method. , 7th
The figure is a side view showing a state in which the stabilizer is attached to the main body of the device by a conventional method, and FIG. 8 is a partial side view showing an enlarged main part of FIG. 7. DESCRIPTION OF SYMBOLS 1... Device body, 2... Stabilizer, 6... Rubber bushing, 8... Corrugated plate, 82... Mountain part of corrugated plate, 83...
...Troughs of the corrugated plate, 82a, 83a...flat parts!・
... Width of corrugated plate, Lo ... Mutual spacing of rubber bushings. Patent applicant: NEC Home Electronics Co., Ltd.

Claims (1)

[Claims] (1) In a lighting device in which a ballast is attached to its mounting member via a pair of rubber bushings spaced apart, the width between the rubber bushings is the same or approximately the same as the mutual spacing. A metal corrugated plate is interposed between the corrugated plate and the corrugated plate is clamped by the mounting member and the stabilizer while the rubber bushings prevent the corrugated plate from spreading laterally. A method for attaching a ballast in a lighting device, characterized by flattening peaks and valleys.