JPH066501Y2 - Coil bobbin - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coil bobbin used in an electromagnetic device including a plurality of coils such as a leakage transformer used in a discharge lamp ballast and a choke for multiple lights.

[Background technology]

Conventionally, coil bobbins as shown in FIGS. 8 and 9 have been used in leakage transformers, multi-lamp chokes and the like. FIG. 9 is a side view of the coil bobbin shown in FIG. In the figure, reference numerals 30 and 31 denote coil winding portions (primary winding portion and secondary winding portion), and these coil winding portions 3
0 and 31 are formed in a rectangular tube shape. Each coil winding unit 30,
An outer flange 34 and an inner flange 35 are provided at both ends of 31, respectively. Then, as shown in FIG. 10, the coil 3 is formed on the outer peripheral surface of each coil winding portion 30, 31.
6 and 37 are wound, and the polarized magnetic path forming iron core 3 is provided on both sides between the inner flanges 35 and 35 having a constant gap.
8, 38 (hereinafter referred to as "pass") is attached. Then,
As shown in FIG. 11, T is placed in the coil winding parts 30 and 31.
The inner core 39 of the shape is inserted, and the outer cores 40 are arranged on both sides of the coils 36 and 37. Pass 38, inner and outer iron cores 39, 4
0 is formed by laminating many thin electromagnetic steel plates. Here, the path 38 is used to divert and split the magnetic flux of the inner and outer iron cores 39 and 40.

At this time, in order to form a predetermined gap between the inner iron core 39 and the path 38, a gap member 41 such as paper or cotton cloth is mounted between them. Then, after assembling the magnetic circuit, an adhesive is injected into the gap (pass gap) for the purpose of reducing vibration.

Therefore, in manufacturing the conventional coil bobbin, the gap member 41 must be prepared in advance,
Further, since it takes time and effort to insert the gap member 41 into the gap between the path 38 and the inner core 39, it is difficult to automate the assembly of an electromagnetic device such as a ballast, which causes a cost increase of the electromagnetic device.

Further, since the paper and cotton cloth used as the gap member 41 are flexible, the path 38 and the iron core 3 are not attached when the electromagnetic device is assembled.
There is a problem in that when they are pressed against each other by 9, 40, they are easily deformed, and thus the characteristics of the electromagnetic device are not constant.

[Purpose of device]

An object of the present invention is to provide a coil bobbin that eliminates the use of a gap material, saves the labor of inserting the gap material, and can reliably secure a gap of a certain size.

[Disclosure of device]

A coil bobbin according to the present invention comprises at least two coil winding portions, an inner iron core is inserted into the coil winding portions, and a polarization magnetic path forming iron core is provided between inner flanges of the coil winding portions facing each other. In the coil bobbin with the interposition of, the inner core of the coil winding part is connected with the connecting part that also serves as a gap material interposed between the inner iron core and the polarized magnetic path forming iron core, and the connecting part is It is characterized in that the coil winding portion is formed to be thinner than the wall thickness and a slit for impregnating an adhesive is formed in the connecting portion.

As described above, according to this invention, since the connecting portion that also serves as the gap member is provided between the coil winding portions, it is possible to secure a constant gap without separately using the gap member. As a result, the characteristics of the assembled electromagnetic device (such as a ballast) become constant.

Further, since the gap material as a separate component can be omitted, the number of components can be reduced and the work of inserting the gap material can be omitted, and as a result, the automation of the assembly of the electromagnetic device such as the ballast becomes easy. Furthermore, since the connection part is thin, the gap can be easily adjusted, and since the slit for adhesive impregnation is formed in the connection part, the connection part and the polarization magnetic path forming iron core can be easily bonded, The vibration noise of the iron core for forming the polarized magnetic path can be reduced.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 7. FIG. 1 is a perspective view showing a coil bobbin of this embodiment, FIG. 2 is a side view thereof, and FIG. 3 is a partially cutaway perspective view showing a main part thereof. As shown in these figures, the coil bobbin 1 of this embodiment has two coil winding parts 2,
A connecting portion 4 is provided between the three and these are integrally connected.

The connecting portions 4 are provided on both sides which are path mounting portions between the coil winding portions 2 and 3, and are interposed between a path which is a polarization magnetic path forming iron core and an inner core to serve as a gap material for filling the gap. Function.

The coil winding parts 2 and 3 and the connecting part 4 are integrally formed of an insulating synthetic resin. Each of the coil winding portions 2 and 3 is formed in a rectangular tube shape having an outer flange 5 and an inner flange 6 provided at both ends.

At this time, the connecting portion 4 is formed to be thinner than the coil winding portions 2 and 3, as shown in FIG. This is because the wall thickness of the connecting portion 4 is determined by the gap size required between the path and the inner core.

FIG. 4 shows a mold structure for molding the coil bobbin 1 of this embodiment, which is composed of an upper mold 7, a lower mold 8 and a core 9, and a resin is formed in a cavity 10 formed when these are combined. 11 is injected to mold the coil bobbin 1. 5 and 6 are sectional views taken along line XX of FIG. 4, FIG. 5 shows a conventional integrated coil bobbin, and FIG. 6 shows a coil bobbin of this embodiment. As is apparent from the comparison of FIGS. 5 and 6, the coil bobbin 1 of this embodiment has a cavity 10a forming the upper and lower connecting portions 12 and 13, and a cavity 10b forming the connecting portions 4 and 4 on both side surface portions. Since the sliding contact surface (rubbing surface, A shown in FIG. 5) between the upper die 7 and the lower die 8 and the core 9 is eliminated, it is possible to prevent the die from being worn.

When the integral coil bobbin is obtained by molding as described above, the slit 14 as shown in FIG. 7 may be formed without allowing the resin to sufficiently flow into the thin-walled connecting portion 4. Rather, the presence of such slits 14 is preferable because it is sufficiently impregnated with the adhesive when the path is fixed with the adhesive. At this time, if a path (thin electromagnetic steel plates are laminated) is used by forming a block by welding or the like, a part of the electromagnetic steel plates does not go to the inner core side through the gap of the slit 14. However, if the size of the slit 14 is such that the path and the inner core do not come into contact with each other, the path does not have to be blocked by welding or the like.

[Result of device]

According to this invention, since the connecting portion that also serves as the gap member is provided between the coil winding portions, it is possible to ensure a certain gap between the path and the inner core without separately using the gap member. You can As a result, the characteristics of the assembled electromagnetic device (such as a ballast) become constant.

Further, since the gap material as a separate component can be omitted, the number of components can be reduced and the work of inserting the gap material can be omitted, resulting in easy automation of the assembly of the electromagnetic device. Furthermore, since the connection part is thin, the gap can be easily adjusted, and since the slit for adhesive impregnation is formed in the connection part, the connection part and the polarization magnetic path forming iron core can be easily bonded, The vibration noise of the iron core for forming the polarized magnetic path can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a partially cutaway perspective view showing an essential part thereof, and FIG. 4 is a cross section showing a die structure for molding a coil bobbin. Figure, fifth
Both FIG. 6 and FIG. 6 are sectional views taken along the line XX of FIG. 4, FIG. 5 is a sectional view showing a connecting portion of a conventional coil bobbin, and FIG. 6 is a sectional view showing a connecting portion of the coil bobbin of this embodiment. FIG. 7 is a partial side view showing another connecting portion in the present invention, FIG. 8 is a perspective view of a conventional coil bobbin, FIG. 9 is a side view thereof, and FIG. 10 is a state of winding a coil around the conventional coil bobbin. FIG. 11 is a plan view of a ballast using a conventional coil bobbin. 1 ... Coil bobbin, 2, 3 ... Coil winding section, 4 ...
Connection part, 6 …… Inner flange, 14 …… Slit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Kodachi, 404-1 Nishinobu Suise, Himeji City, Hyogo Prefecture, Ikeda Denki Co., Ltd. (72) Susumu Nabeshima 404-1 Nishinobu Suise, Himeji City, Hyogo, Japan (56) References: Actual development: Sho-55-99126 (JP, U) Actual development: Sho-56-24119 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A coil winding part comprising at least two coil winding parts,
In a coil bobbin in which the inner iron core is inserted into these coil winding portions and the polarization magnetic path forming iron core is interposed between the inner flanges of the coil winding portions facing each other, the inner iron core and the polarization magnetic path forming core are formed. The inner flanges of the coil winding portion are connected by a connecting portion that also functions as a gap material interposed between the iron core and the connecting portion, and the connecting portion is formed thinner than the coil winding portion. A coil bobbin characterized in that a slit for impregnating an adhesive is formed in the portion.