JPS6149407A - Transformer - Google Patents

Abstract

PURPOSE:To stably secure a magnetic shielding plate by positioning by prividing a piece for holding the lower end of the shielding plate at an insulation protecting case mounted on a transformer body. CONSTITUTION:A core 10 is contained in an insulation protecting case 12, and a transformer body 11 is associated. Mounting pieces 13 are provided integrally with the lower portions of both outsides of the case 12. The lower end of a -shaped electromagnetic shielding plate 14 made of directional silicon steel plate is engaged with the outside of the case 12 at the upper portions of reinforcing portions 13a at both sides of the pieces 13, and a holding piece 16 having a positioning gap 15 is integrally provided. When the plate 14 is associated on the outer periphery of the case 12, the plate 14 is held by the piece 16, positioned at the height direction to completely correspond to the core 10. Then, the plate 14 is secured by an adhesive or adhesive tape to complete it. With this construction, the irregularity in the mounting position is entirely eliminated to hold stable shielding effect, and a beat noise between the shielding plates of between the core and the plates can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to transformers used in consumer and industrial electronic equipment.

Structure of the conventional example and its problems In the conventional transformer, as shown in Fig. 1, a winding 2 is wound around a coil bobbin 1, a lead wire of the winding 2 is wound around it, and it is connected to a terminal 3 by soldering. , the iron core 4 is incorporated and an insulating protective case 5 made of a molded product is attached, but the radio equipment suffers from hum due to the influence of leakage magnetic flux generated from the iron core 4.

In video equipment, in order to block this leakage magnetic flux, a hole made of grain-oriented silicon steel plate or the like is installed on the outer periphery of the iron core 4, as shown in Figs. A character-shaped or U-shaped electromagnetic shielding plate 6 came to be incorporated, and was used by being fixed to the outer periphery of the insulating protective case 5 with adhesive or tape, as shown in FIG.

In this case, the problem is that when fixing the electromagnetic shield plate 6, as shown in FIG. However, when installing the electromagnetic shielding plate 6, deviations and variations in the → direction occur during work, resulting in reduced shielding effectiveness and variations. Furthermore, in terms of work, attaching the mounting brackets requires extra time in the process, causing an increase in costs. .

OBJECTS OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned conventional drawbacks, and to provide a transformer with stable mounting of an electromagnetic shield plate and a shielding effect.

Structure of the Invention In order to achieve the above object, the transformer of the present invention has a structure in which an insulating protection case attached to the transformer body is provided with a holding piece for holding the lower end of the electromagnetic shield plate, and with this structure, the stain magnetic shield can be removed. The board can be positioned and fixed.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 6 to 8 of the drawings. In Fig. 6, the winding 8 is attached to the coil bobbin 7.
and connect the lead wire of this winding 8 to the pin terminal 9,
An iron core 10 made of a silicon steel plate is incorporated to constitute the transformer body 1.1.

This transformer body 11 is assembled into an insulating protective case 12 such that at least the iron core 10 is completely housed therein.

Attachment pieces 13 are integrally provided at the lower portions of the outer surfaces on both sides of the insulation protection case 12, and at the upper portions of the reinforcing portions 13a on both sides of the attachment pieces 13, the outer surfaces of the insulation protection case 12 are connected. A holding piece 16 having a slit 16 in which the lower end of a mouth-shaped electromagnetic shielding plate 14 made of grain-oriented silicon steel plate or the like is inserted and positioned is integrally provided therebetween.

Therefore, an electromagnetic shielding plate 14 is incorporated into the outer peripheral surface of this insulating protection case 12, and this electromagnetic shielding plate 14
is held by the above-mentioned holding piece 16 and positioned in the height direction, so that it completely corresponds to the iron core 1o. After that, the electromagnetic shielding plate 14 is fixed with adhesive or adhesive tape to obtain the finished product shown in FIG. 6.

Incidentally, as the electromagnetic shielding plate 14, a square-shaped plate shown in FIG. 6 may be used.

As described above, the transformer of the present invention has an electromagnetic shielding plate,
By providing a mechanical holding piece on the outside of the insulation protection case, installation workability is improved and there is no variation in installation position, making it possible to maintain a stable shielding effect. .

In addition, since the shield plate is attached to the iron core while keeping the distance equal to the thickness of the molded product, the mutual hum of the electromagnetic shield plates,
It also has the effect of reducing the humming noise of the iron core and electromagnetic shield plate.

[Brief explanation of the drawing]

A perspective view of a plate, FIG. 4 is a completed perspective view of another conventional transformer, FIG. 6 is a perspective view of a conventional transformer in the process of being assembled, and FIG. 6 is an assembly of an embodiment of the transformer of the present invention. FIG. 7 is a perspective view of the completed transformer of the present invention, and FIG. 8 is a perspective view of an electromagnetic shield plate used in the transformer. 7... Coil bobbin, 8... Winding wire, 9
...Pin terminal, 10...Iron core, 11.
...Transformer body, 12...Insulation protection case, 13...Mounting piece, 14...Electromagnetic shielding plate, 16...Slit, 16・・・・・・
...Holding piece. Name of agent: Patent attorney Toshio Nakao and one other person (Q

Claims (1)

[Claims] The transformer body is constructed by winding a winding around a coil bobbin made of a molded product, and incorporating an iron core into this coil bobbin.A protective insulation case made of a molded product is attached to the outer periphery of the transformer body, and is assembled into the part corresponding to the outer periphery of the iron core. A transformer characterized in that a holding piece is provided on the outer surface of the insulating protection case to hold the lower end of the square-shaped or U-shaped electromagnetic shielding plate.