JPS6129523B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a discharge lamp ballast applied to a fluorescent lamp.

[Background technology]

A conventional discharge lamp ballast is shown in FIG. In the figure, 1 is the iron core, 2 is the coil, 3 is the terminal, and 4
is a coil cover, 5 is a mounting plate, 6 is a mounting hole provided in the mounting plate 5, 7 is a varnish hanging hole provided in the mounting plate 5, and 8 is a crimping hole bent on both sides of the mounting plate 5. The ribs 9 are crimping holes through which the coil cover 4 is crimped and fixed to the iron core 1.

In the discharge lamp ballast configured in this way,
The coil cover 4 is made of a metal material. This is because if a plastic molded product is used, the insulation deteriorates at the end of the discharge lamp ballast's life, and if the discharge lamp ballast were to catch fire, it could ignite the coil cover 4 and cause a fire. This is because it becomes a cause.

However, for example, when using iron with a thickness of 0.5 mm, its natural frequency is 3 to 4 KHz,
Since this almost matches the frequency of the anode vibration of the fluorescent lamp, there is a problem in that the noise of the discharge lamp ballast increases. It has been proven that the cause of this is due to the coil cover 4, since the noise is lower when the coil cover 4 is removed.

As a solution to this problem, if the metal coil cover 4 is closely attached to the coil 2 through a suitable insulator, the coil cover 4 will be in close contact with the iron core 1 through varnish treatment, etc., and the vibration of the coil cover 4 will be prevented. However, if the coil cover 4 is brought into close contact with the coil 2 via an insulating material, it will be difficult for the coil cover 4 to be inserted through the coil cover 4 when the coil cover 4 is crimped and installed. This applies force to the coil 2, damaging the insulating coating of the coil 2 and causing problems such as interlayer short circuits. Furthermore, if only the number of turns is changed between, for example, 50Hz and 60Hz, the coil 2 and coil cover 4 will not be able to fit properly if the number of turns is small, which will increase the vibration of the coil cover 4 and increase the noise. .

Therefore, it is considered necessary to raise (or lower) the natural frequency of the coil cover 4 or to increase the rigidity of the coil cover 4.

[Purpose of the invention]

An object of the present invention is to provide a discharge lamp ballast in which the natural frequency of the coil cover is shifted without complicating the manufacturing process.

[Disclosure of the invention]

The discharge lamp ballast of the present invention includes an iron core, a coil around which the iron core is wound, and a hole that is attached to the iron core and covers an exposed portion of the coil and exposes a terminal of the coil. and a metal coil cover formed by cutting and raising the coil toward the coil side.

According to the structure of the present invention, since the cut and raised pieces are cut and raised on the metal coil cover, the natural frequency of the coil cover changes and deviates from the frequency of the anode frequency of the fluorescent lamp. can reduce noise. Furthermore, since the cut-and-raised piece is formed by cutting and raising a hole for exposing the terminal of the coil cover, there is no need to add any separate parts, and manufacturing is easy.

Embodiment An embodiment of the present invention will be described based on FIG. 2. That is, this discharge lamp ballast has an iron core 1,
A coil 2 wound around this iron core 1 and the iron core 1
a hole 10 attached to the coil 2 to cover the exposed portion of the coil 2 and expose the terminal 3 of the coil 2;
A metal coil cover 11 is formed by cutting and raising a piece 12 toward the coil 2 side.

Since the configurations of the iron core 1, coil 2, and terminal 3 are the same as those shown in FIG. 1, their illustrations are omitted and FIG. 1 is referred to in this embodiment. Note that 13 is a groove for crimping the rib 8 of the mounting plate 5, and 14 is a crimping piece for locking into the crimping hole 9 of the iron core 1.

When the natural frequency of this coil cover 11 was investigated, it was found to be 5 to 6 Hz, and the noise was significantly reduced.

According to this embodiment, the metal coil cover 1
Since the cut and raised piece 12 is cut and raised at 1, the natural frequency of the coil cover 11 changes and deviates from the frequency of the anode vibration of the fluorescent light, so that the noise of the discharge lamp ballast can be reduced. Moreover, coil cover 1
Since the hole 10 for exposing the terminal 3 of 1 is formed by cutting and raising, there is no need to add any separate parts, and manufacturing is easy.

A second embodiment of the invention is shown in FIG. That is, in the first embodiment, the cut and raised piece 12 is folded back to approach the coil cover 11 to form the groove 15 between it and the wall surface of the coil cover 11.
The surface coating varnish a is made to penetrate into the area 5. In this way, the noise of the coil cover 11 can be further reduced by the vibration absorption of the surface coating varnish a.

〔Effect of the invention〕

According to the discharge lamp ballast of the present invention, since the cut and raised pieces are cut and raised on the metal coil cover, the natural frequency of the coil cover changes and deviates from the frequency of the anode frequency of the fluorescent lamp, so it is stable. The noise of the equipment can be reduced. Furthermore, since the holes for exposing the terminals of the coil cover are formed by cutting and raising, there is no need to add any separate parts, and the manufacturing is easy.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional discharge lamp ballast, FIG. 2 is a perspective view of a coil cover according to the first embodiment of the present invention, and FIG. 3 is a sectional view of the coil cover according to the embodiment shown in FIG. be. 1... Iron core, 2... Coil, 3... Terminal, 10... Hole,
11...Coil cover, 12...Cut and raised piece.

Claims (1)

[Claims] 1. An iron core, a coil wound around this iron core, and a hole that is attached to the iron core to cover the exposed portion of the coil and expose the terminal of the coil, and a piece is cut and raised toward the coil side. A discharge lamp ballast comprising a metal coil cover formed by the above.