JPH057695Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] This invention relates to a ballast mounting structure for a lighting fixture,
More specifically, the present invention relates to a structure for mounting a ballast in a lighting fixture, particularly a lighting fixture using a fluorescent lamp, by abutting the terminal forming surface of the ballast against the fixture body.

[Background Art] In general, in a ballast 5 that is attached with its terminal-forming surface abutting against the fixture body 1 as shown in Fig. 7, the terminal 6 and fixture body 1 are in close proximity, and there is a risk of the terminal 6 coming into contact with the fixture body 1 and causing a short circuit. Furthermore, when a leakage transformer type ballast is used as the ballast 5, a path gap exists in the center of the iron core 13, so that as shown in Fig. 8, magnetic flux leaks from the cutout window 15 where the terminal 6 of the ballast 5 is exposed, causing the problem that this leakage magnetic flux causes the fixture body 1 made of steel plate to vibrate and generate noise. Furthermore, in the case of ballast 5 which is attached by abutting the terminal forming surface against the fixture body 1, the contact area with the fixture body is smaller by the amount of terminal 6, so the area available for heat conduction is small and the heat dissipation efficiency is low. Moreover, since ballast 5 generates a large amount of heat and is fixed to fixture body 1 with screws 9, ballast 5 and fixture body 1 are not completely in contact with each other and there is often a small gap 16 as shown in Figure 9. This results in a low efficiency of heat transfer from ballast 5 to fixture body 1 and insufficient heat dissipation through fixture body 1, creating a risk of the ballast overheating.

[Purpose of the invention] The present invention was created in view of the above points, and its main purpose is to prevent short circuits between the terminal and the main body of a ballast that has a terminal on the main body side of the device. Another purpose is to prevent vibration of the device body due to magnetic flux leakage from the ballast, and another purpose is to bring the ballast and the device body into close contact. By doing so, it is possible to efficiently dissipate heat from the ballast.

[Disclosure of the invention] (Examples) Examples of the invention will be described below based on the drawings. As shown in FIG. 1, a device main body 1 is used for an annular fluorescent lamp, and is formed into a cylindrical shape that is open downward. A circular base 2, which is the upper bottom wall of the device main body 1, is formed of a steel plate, and the base 2 has a pair of protrusions 3 running approximately parallel to each other with the center in between.
is provided to protrude upward, and this protrusion 3 allows the instrument body 1 to be
has been reinforced. A stabilizer mounting portion 4 is formed on the base 2 along the outside of one of the protrusions 3.
The ballast 5 is a leakage transformer type ballast, and is formed by winding a primary coil 11 and a secondary coil 12 around an iron core 13, as shown in FIGS. 3 and 4. A ballast base 14 having a substantially U-shaped cross section and opening downward is provided to surround the ballast. Cutout windows 15 are formed at three locations along the longitudinal direction of the upper surface of the ballast base 14, and are spaced apart from each other.
A terminal 6 is exposed at a position corresponding to each cutout window 15. In addition, a third
As shown in Figures c and d, a path gap 17 is formed, and leakage magnetic flux is generated at this location. The ballast mounting part 4 is connected to the terminal 6 of the ballast 5 as shown in FIG.
Convex portions 7 that protrude upward are formed at three positions corresponding to , and convex portions 8 that protrude slightly downward from the lower surface of the base 2 are formed between a pair of adjacent convex portions 7 . The protrusion height of the convex portion 7 is determined by conducting the following experiment.

That is, as shown in FIG.
0 is installed, the terminal forming surface of the stabilizer 5 is opposed to the strip plate 10, and the strength of vibration of the strip plate 10 is measured while changing the distance D between the strip plate 10 and the stabilizer 5. An example of the results of this experiment is shown in FIG. Here, a ballast 5 for lighting a 60 to 70 W fluorescent lamp is used. In FIG. 6, the upper curve is the measurement result when the terminal forming surface faces the strip plate 10, and the lower curve is the measurement result when the surface opposite to the terminal forming surface faces the strip plate 10. These are the measurement results.
From this result, it can be seen that when the terminal forming surface faces the strip plate 10, the vibration of the strip plate 10 increases due to the large leakage magnetic flux.
In order to make the vibration smaller than the maximum vibration when the surface opposite to the terminal forming surface faces the strip plate 10, the distance D between the ballast 5 and the strip plate 10 should be set to 4.5.
It turns out that it is best to keep it at mm or more. Therefore, if the protruding height of the convex portion 7 is set to 4.5 mm or more, the influence of vibration caused by leakage magnetic flux can be reduced when the terminal forming surface is brought into contact with the device main body 1. In particular, the central convex portion 7 corresponding to the pass gap 17 is set to a sufficient protrusion height so as not to be affected by leakage magnetic flux.

The ballast 5 is attached to the ballast mounting portion 4 and is fixed to the instrument body 1 by a pair of screws 9 such that each terminal 6 of the ballast 5 corresponds to a convex portion 7, respectively. A screw hole (not shown) is formed in the instrument body 1, and the lower surface of the protrusion 8 protrudes below the surface on which the screw hole is formed. Therefore, when the ballast 5 is fixed to the device body 1 with the screws 9, the lower surface of the protrusion 8 comes into pressure contact with the top surface of the ballast 5, and the ballast 5 comes into close contact with the device body 1 without any gaps, so the terminal Even though the forming surface is attached to the device body 1, sufficient heat conduction can be carried out from the ballast 5 to the device body 1, and the heat dissipation of the ballast 5 is through the device body 1. It is done efficiently.

[Effects of the invention] As described above, in the present invention, a convex part is formed on the main body of the device that protrudes on the opposite side of the ballast at a position corresponding to the terminal of the ballast. This has the advantage that a sufficiently large insulation distance can be provided between the terminal and the device body, and short circuits between the terminal and the device body can be prevented. In addition, the protruding height of the convex part at the position corresponding to the pass gap of the leakage transformer type ballast should be set so that the vibration is lower than the maximum vibration of the device body when the surface opposite to the terminal forming surface is brought into contact with the device body. Since the protrusion height is set to such an extent that the ballast is small, it is possible to separate the ballast from the main body of the device so that the influence of leakage magnetic flux from the pass gap of the ballast on the main body of the steel plate can be sufficiently reduced. This has the effect of reducing noise caused by vibration of the instrument body.
Furthermore, between a pair of adjacent protrusions, a protrusion that protrudes toward the ballast and presses against the ballast is formed on the device body, so when the ballast is attached to the device body, the protrusion is in close contact with the ballast. This has the advantage that the ballast can be prevented from being installed in a floating state from the appliance body, and the appliance body functions as a heat sink for the ballast. In particular, while the ballast tends to separate from the device body due to its own weight, by forming a protrusion on the device body that protrudes toward the ballast, the tight contact between the device body and the ballast is improved. can be maintained. That is, although the contact area between the device body and the ballast is reduced by forming the convex portion at the portion corresponding to the terminal of the ballast, the convexity brings the device body and the ballast into close contact.
This can compensate for the decrease in heat transfer efficiency. Moreover, since the protrusion that comes into close contact with the ballast is formed between the protrusions formed corresponding to the terminals, even though the main body of the device and the ballast are in close contact, the terminal of the ballast and the device This has the advantage that there will be no short circuit with the main body, and there will be no increase in vibration of the instrument main body due to the influence of leakage magnetic flux from the pass gap.

[Brief explanation of drawings]

Fig. 1 is a plan view showing one embodiment of the present invention;
The figures are a sectional view taken along the line X-X in Figure 1, Figures 3 a, b,
c and d are respectively a plan view and a front view showing the ballast used in the above, a sectional view taken along line X-X in the same figure a, a partially omitted plan view showing the iron core of the ballast, and Figure 4 is used in the same as the above. Figures 5a and 5b are a plan view and side view showing the experimental method for determining the protrusion height of the convex portion, and Figure 6 is a graph showing an example of the results of the same experiment. 7 is a partially cutaway front view showing a conventional example, FIG. 8 is an explanatory diagram of the operation of the same ballast, and FIG. 9 is an enlarged view of section A in FIG. 7. 1 is a device main body, 5 is a stabilizer, 6 is a terminal, 7 is a convex portion, and 8 is a convex portion.

Claims (1)

[Scope of utility model registration request] In a structure where a leakage transformer type ballast is attached to the bottom side of the device body with the terminal forming surface of the ballast in contact with the steel plate device body, the side opposite to the ballast at the position corresponding to the terminal of the ballast In addition to forming a protrusion on the device body, the protrusion height of the protrusion at a position corresponding to the pass gap of the ballast is adjusted to the height of the protrusion on the device body when the surface opposite to the terminal forming surface is brought into contact with the device body. In a lighting equipment, the protrusion height is set to such an extent that the vibration is smaller than the maximum vibration of Stabilizer mounting structure.