JPH1126257A - Bobbin for thin transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To normally wind the winding of a thin transformer around a bobbin, by forming voids which are extended toward the terminal sides of a lower flange from the winding barrel section of the bobbin through the flange for escaping lead-out wires. SOLUTION: A bobbin for thin transformer has a hollow main body 1, and the main body 1 is provided with a winding barrel section 2, a thin upper flange 3 which is integrally formed with the upper end of the section 2, and a lower flange 4 integrally formed with the lower end of the section 2. Thick sections 5 are respectively formed below both ends of the lower flange 4, and the base- side end sections of an appropriately number of surface mounting type terminals are buried in the external side faces 5a of the thick sections 5. In addition, recessed guide grooves 7 having tapered side faces are formed between the base-end sections of the terminals 6, and thin belt-like voids 8 extended toward the winding barrel section 3 are formed from the grooves 7 so as to escape lead-out wires. Each void 8 is formed in the form of a through hole between the upper and lower surfaces of the flange 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin transformer bobbin incorporated in a communication card, for example.

[0002]

2. Description of the Related Art In recent years, various electronic devices have been increasingly required to be miniaturized, and accordingly, various electronic components mounted and mounted on a printed circuit board have also been required to be reduced in size and thickness.

As this type of thin transformer, for example, there is one having a thickness of about 3 mm, and the bobbin around which the winding is wound and the core incorporated therein are very small.

In such a thin transformer bobbin, what is important when winding the winding is to reduce the thickness of the bobbin flange as much as possible and to reduce the winding space in order to obtain desired characteristics. However, it is to earn money, and to efficiently wind many windings there, and for that purpose, it is preferable to wind the windings in alignment.

However, as shown in FIG. 3, the conventional thin transformer bobbin has a very small thickness of the flange 4 'so that the terminal 6' is attached to the body of the flange 4 'which protrudes outward. It is difficult to form a lead groove for a lead wire extending toward the winding drum part 2 'from a molding technique, so that a tapered shape is formed on the upper part of the thick part 5' formed at the outer end of the flange 4 '. Most of them have a structure provided with a lead wire guide groove 7 '.

[0006]

In this case, as shown in FIG. 4, the lead wire 9 is inserted into the winding space on the flange 4 '.
Since the a 'creeps, the surface becomes uneven, and when the winding 9' is performed, the leader 9a 'and the winding 9' intersect and are rubbed, so that the leader 9a 'is easily damaged, and the winding space is increased. In addition, since the lead wire 9a 'is creeping, there is a problem that the winding is apt to collapse and the aligned winding cannot be performed.

The present invention has been proposed in view of the above. An object of the present invention is to form a through hole in a flange so that a lead wire can escape there, and a lead wire can be formed on a winding space. An object of the present invention is to provide a thin transformer bobbin that can be aligned and wound without crawling.

[0008]

SUMMARY OF THE INVENTION The present invention provides a bobbin in which a flange is formed above and below a winding drum 2, respectively.
The above object is achieved by forming a gap 8 in the lower flange 4 extending from the winding drum section 2 toward the terminal 6 and allowing the lead wire 9a to escape. The space 8 has a through-hole shape that can be formed by injection molding.

[0009]

FIG. 1 shows an embodiment of the present invention.
In the figure, reference numeral 1 denotes a thin bobbin main body having a thin structure made of a molded product of an insulating resin. The bobbin main body 1 is hollow and has a cylindrical winding drum portion 2, a thin upper flange 3 integrally formed on an upper end of the winding drum portion 2, and a lower end of the winding drum portion 2. And a thin lower flange 4.

Thick portions 5 are respectively formed below both ends of the lower flange 4, and base portions of a suitable number of surface-mounting terminals 6 are buried in the outer surface 5 a of the lower flange 4 at intervals. A concave guide groove 7 having a tapered surface is formed therebetween.

A narrow band-shaped gap 8 extending from the guide groove 7 toward the winding drum 2 is formed. The gap 8 has a hole shape penetrating vertically through the lower flange 4, that is, a communicating structure.

That is, since the flange is extremely thin from the viewpoint of miniaturization and thinning, it is very difficult to form a groove therein by molding. For this reason, in the past, the conventional idea was to form a groove in a thin transformer bobbin, but it was impossible to form the groove. However, the present inventors changed the origin of the conventional ideas to form the gap 8 instead of the groove in order to realize the aligned winding, and formed the gap 8 to allow the lead wire to escape there.
The so-called flushing space is set on the winding space, so that the lead wire and the winding wire do not intersect with each other, so that aligned winding can be performed. That is, forming the gap 8 in the thin flange can be realized relatively easily by a molding technique.

FIG. 2 is an explanatory view showing the state of winding of the winding. When winding the winding wire 9 around the bobbin main body 1, the lead wire 9 a is accommodated in the gap 8, and the winding wire 9 is wound on the flush upper surface. In this case, the lead line 9a escapes into the gap 8 and the upper surface is flush, so that the lead line 9a
And the winding 9 do not intersect, thereby preventing the winding collapse and the like resulting from the intersection, sufficiently securing the winding space, and performing the aligned winding of the winding 9.

The end of the lead wire 9a is connected to a predetermined terminal 6
And are electrically connected. As is well known, a transformer is assembled in the bobbin main body 1 by incorporating a core (not shown) made of a desired material and shape corresponding to the purpose and application. It is needless to say that the lead wire 9a is properly accommodated in the gap 8, and does not come into contact with the core to be incorporated.

[0015]

As described above, according to the present invention, since the gap 8 for allowing the lead wire 9a to escape is formed in the flange, the lead wire 9a and the winding wire 9 do not intersect with each other. Unwinding can be prevented, and the windings can be aligned and wound around the winding space.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of the present invention.

FIG. 2 is a partial explanatory view showing a winding state of an electric wire.

FIG. 3 is a perspective view of a conventional example.

FIG. 4 is an explanatory view of a winding state of an electric wire in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bobbin main body 2 Winding body part 3 Upper flange 4 Lower flange 5 Thick part 6 Terminal 7 Guide groove 8 Air gap 9 Winding wire 9a Leader wire

Claims (2)

[Claims] 1. A bobbin in which a flange is formed above and below a winding drum section (2).
A bobbin for a thin transformer, wherein a void (8) extending from the winding drum section (2) toward the terminal (6) and allowing the lead wire (9a) to escape is formed. 2. The lower flange (4) in which the terminal (6) is implanted is thin and the gap (8) is different from the groove, and has a through-hole shape extending up and down the lower flange (4). The bobbin for a thin transformer according to claim 1, wherein