JPH0225225Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to a ballast for discharge lamps.

(Prior art) As is well known, this type of ballast is normally constructed by winding a coil around an iron core, and when it is used for lighting a discharge lamp, it is used as shown in Figure 4. It is used connected to a discharge lamp. That is, in the figure, 1 is a ballast, and the configuration shown in the figure is composed of a primary coil 2 and a secondary coil 3 wound around an iron core 4, and a discharge lamp 5 is connected to the output end of the ballast. be. Conventionally, the coil 6 for heating the filament of the discharge lamp was wound around the primary coil 2 and connected to the filament of the discharge lamp.

However, with this configuration, the primary coil and the coils for each filament must be insulated from each other. It is necessary to wrap the coils 6 in an overlapping manner, wrap the insulating paper again, and further wind the other coil 6 on the surface of the insulating paper. Therefore, manufacturing of this type of ballast is extremely troublesome, and the overall size of the coil also increases.

(Problems to be Solved by the Invention) The purpose of this invention is to make it possible to downsize the coil of this type of ballast and to facilitate its manufacture.

(Means for Solving the Problem) This invention involves installing filament coils, which are made by winding electric wires, in parallel to the collar of a bobbin on which the ballast coil is wound, parallel to the collar. ,
Furthermore, the surface of the filament coil is covered with an insulating cover.

(Embodiment) An embodiment of this invention will be described with reference to the drawings. In FIGS. 1 to 3, numeral 11 denotes a molded bobbin around which the primary coil 2 is wound, and a bobbin body 12 and a flange extending from both ends of the bobbin. It consists of 13. Such a configuration is not particularly different from the conventional one. The filament coil 6 described above is constructed by winding an electric wire into a flat plate shape. 15 is an end thereof, and 16 is an insulating cover.

The coils 6 are arranged in parallel on the surface of one of the flanges 13 so as to be parallel thereto. In this case, the coil 6 has a cavity 17 formed in its center, into which the central leg 4A of the iron core 4 can be inserted.
In order to facilitate this insertion, the iron core 4 of the flange 13 is
It is preferable that a wall portion 18 is provided in advance around the periphery of the insertion hole 17, and the cavity 17 of the coil 6 is fitted into this wall portion 18.

The cover 16 is used to insulate the surface of the coil 6 arranged in parallel to the flange 13 from the iron core as described above, and is made of polyester film, for example. In this case, in order to prevent it from easily coming off from the flange 13, for example, a pin is attached to the surface of the flange 13 as shown in the figure.
It is preferable to establish a hole 20 in the cover 16 and support it by fitting a pin 19 into a hole 20 formed in the cover 16.

In the above configuration, after winding the primary coil 2 around the bobbin body 12 and arranging the coil 6 in parallel on the flange 13, the cover 16 is applied to the surface of the coil 6, and the pin 19 is inserted into the hole 20. Then, the cover 16 is attached to the flange 13. Note that this installation requires that the flange 1 be attached before the bobbin 11 is attached to the iron core 4.
It is sufficient as long as it does not deviate from 3.

In this way, the coil 6 becomes interlinked with the magnetic flux passing through the iron core leg 4A, thereby generating a voltage in the coil 6 due to electromagnetic induction. This voltage is used as the voltage for heating the filament.

Note that when it is necessary to insulate the outer periphery of the coil 6 from the iron core 4, etc., it is best to provide a wall 21 on the outer periphery of the flange 13 as shown in the figure. 6 will be installed. Furthermore, instead of the film shown in the figure, a resin-molded plate may be used as the cover 16. Although only one coil 6 is shown in the figure, there are actually two coils as shown in Figure 2.
It is necessary to prepare items. Therefore, these two coils may be installed in parallel.

(Effects of the invention) As detailed above, according to this invention, the filament heating coil is wound in a flat plate shape, and this is wrapped around the flange of the bobbin used for winding the ballast coil. In addition, like the coils wound around the bobbin, they are arranged in parallel so as to interlink with the magnetic flux passing through the ballast core, and the surface of this coil is covered with an insulating cover. It is no longer necessary to electrically insulate the surface of the ballast coil and wind a filament coil around it, which makes it possible to downsize the ballast coil and also to sequentially interpose insulating paper as in the past. There is no need to wind the coil by
Since all the parts used are an insulating cover, the device can be manufactured at an extremely low cost.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a bobbin showing an embodiment of this invention, FIG. 2 is a perspective view of the bobbin, FIG. 3 is a cross-sectional plan view of the ballast, and FIG. 4 is a lighting circuit diagram. 2, 3... Coil for ballast, 4... Iron core, 6
... Coil for heating the filament, 11 ... Bobbin, 13 ... Flange, 16 ... Cover.

Claims (1)

[Scope of utility model registration request] On the flange of the bobbin where the ballast coil is wound,
Coils for filament formed by winding electric wire into a flat plate are arranged parallel to the flange, and the surface of the coil for filament is covered with an insulating cover, and the coil for the bobbin and filament is covered with an insulating cover. A ballast for a discharge lamp is made of a ballast core that is magnetically interlinked with the ballast core.