JPS6129109A - Transformer - Google Patents

Abstract

PURPOSE:To enable to employ a split mold structure as a mold of a coil bobbin by forming collars at both ends of a winding body formed with a bent piece for forming square-sectional cylinder by bending and coupling with both open ends in U-shape. CONSTITUTION:Collars 12, 13 are respectively formed at both ends of a winding body having bent pieces 10, 10' for forming square-sectional cylinder by projecting upward and bending perpendicularly at both open ends in U-shape. Further, a terminal unit 15 to which terminal pins 14 are implanted is provided at the lower ends of the collars 12, 13. The pieces 10, 10' are bent and coupled with a coil bobbin 9, and a winding is then wound on the body 11 between the collars 12 and 13. E-shape and I-shaped cores 18, 19 made of ferrite core or laminated core are associated with the bobbin 9 to construct a transformer.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to transformers used in various audio equipment, video equipment, industrial equipment, and the like.

Conventional Structures and Problems Therein In recent years, the demand for transformers has increased significantly with the growth of the electronics industry. Under these circumstances, market needs include lighter, thinner, shorter, and smaller products, lower costs, and even shorter lead times for commercialization.

Hereinafter, a conventional transformer will be explained with reference to the drawings.

1 is E, which is a ferrite core or a laminated iron core.
2 is an I-type magnetic core such as a ferrite core or a laminated iron core that is combined with the E-type magnetic core 1 to form a closed magnetic circuit magnetic core; 3 is a synthetic resin □ coil bobbin; Flanges 5 and 6 are provided at both ends of the body 4, and a terminal portion 8 having a terminal pin 7 implanted therein is integrally provided at the lower end of the flanges 5.about.6'.

A winding wire was wound around the winding body 4 of this coil bobby 73, and the E-shaped magnetic core 1 and the engineered magnetic core 2 were assembled to form a transformer.

With this configuration, since the coil bobbin 3 has a rectangular cylindrical six-winding drum 4, the mold structure requires a four-way split type structure, which is the direction of the so-called terminal pin 7 and the EI type magnetic core 1. , 2, it was impossible to make the hem without dividing it in the insertion direction. For this reason, the cost of the molding die was high, the manufacturing time of the molding die was long, and it could not be said that it could fully meet market needs.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks, and aims to provide a transformer that can reduce costs and shorten the lead time for commercialization.

Structure of the Invention In order to achieve the above-mentioned object, the transformer of the present invention has flanges at both ends of the winding drum, which is in the shape of a trowel and has bent pieces that form a rectangular tube by being bent and joined at both open ends. A coil bobbin is provided with a terminal portion provided with a terminal pin at the lower part of the collar, and a wire is wound on the winding body of the coil bobbin and a core is incorporated.With this structure, the coil bobbin is A two-way split mold structure can be adopted as the mold, reducing mold cost and manufacturing time, which in turn reduces the cost of the transformer and shortens the lead time for commercialization. It is possible to shorten the time.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 to 4 of the drawings.

9 is a coil bobbin formed by molding synthetic resin;
This coil bobbin 9 has a trowel-like shape, and has flanges 12. at both ends of a winding drum 11 which has bent pieces 10, 10' projecting upward from both open ends and forming a rectangular tube by being bent at right angles.
13 is provided, and a terminal pin 14 is provided at the lower end of this collar 12゜13.
The terminal portion 16 is provided with a terminal portion 16 implanted therein.

The bent pieces 10 and 10' are dimensioned so that they overlap at their tips when folded together, and these overlapping parts become thin parts 10a and 10'a, and the thin parts 10 have thin parts 10a and 10'a. is provided with an inverted trapezoidal connecting protrusion 16,
The other thin portion 10'a is provided with an inverted trapezoidal coupling groove 17 into which the coupling protrusion 16 is fitted.

After the above-mentioned bent pieces 10 and 10' are bent and combined, the coil bobbin 9 is wound with a winding on the winding drum 111' between the flanges 12 and 13. This coil bobbin 9 has an E-type magnetic core 18 made of a ferrite core or a laminated iron core.
and a molded magnetic core 19 are incorporated to form a transformer.

As mentioned above, since the winding drum 11 of the coil bobbin 9 is initially in the shape of a trowel, the coil bobbin 9 can be molded using a two-way split mold, which can significantly reduce the cost of the mold. By making the structure of the mold into a subassembly, the number of days required for manufacturing the mold can be shortened, and as a result, the transformer can be made at low cost and the lead time for commercialization can be shortened. In addition, since the two bent pieces 10 and 10' are combined, there is no inferiority in terms of insulation and other aspects compared to conventional coil bobbins.
It can be made highly reliable.

Effects of the Invention As described above, the transformer of the present invention has a trowel-shaped winding body as a coil bobbin, so a mold split in two directions can be used for molding the coil bobbin, simplifying the mold structure and reducing costs. This will meet market needs, such as reducing cost, production time, and greatly increasing the number of molded parts, making insert molding of terminal bins easier, and ultimately reducing transformer costs and shortening the lead time for commercialization. It has the advantage of being able to meet the above requirements, and has the same quality as conventional products in terms of insulation and other qualities, making it of great industrial value.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the main parts of a conventional transformer, and FIG. 2 is an exploded perspective view of the main parts of an embodiment of the transformer of the present invention.
FIG. 3 is a perspective view of a coil bobbin used in the transformer, and FIG. 4 is a cutaway perspective view of essential parts of the coil bobbin. 9... Coil bobbin, 10.10'...
Bent piece, 10a, 10'a...thin part,
11... Winding barrel, 12° 13... Tsuba, 14.
Middle...Terminal pin, 16...Terminal section, 16...
・Joining protrusion, 17...Joining groove, 18, 19...
····core. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 4

Claims (1)

[Claims] A collar is provided at both ends of the winding drum, which has a U-shaped bent piece that forms a rectangular tube by being bent and joined at both open ends, and a terminal portion with a terminal pin is attached to a part of the collar. A coil bobbin is provided, a winding is applied to the winding body of the coil bobbin,
A transformer that incorporates a magnetic core.