JPH0935954A - Small-sized wire wound electric component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized wire wound electric component, in which break of a coil wound through a diagonal lamp winding method is prevented effectively while looseness of the coil on a core is reduced extremely and accuracy of which is improved. SOLUTION: The external surface 52g of the winding section 52a of a bobbin 52 is formed obliquely in a slight gradient while the internal surface 52f of the winding section 52a is made parallel with the external surface 52g and formed slantingly, and a tapered part 50d conformed to the oblique shape of the internal surface 52f of the winding section of the bobbin 52 is formed to a leg surface in a core 50b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to small electric winding parts, and more particularly to small transformers, choke coils and the like.

[0002]

2. Description of the Related Art Small electric winding parts are widely used in electric appliances such as televisions, video cameras, tape recorders, and flashlight emitters used for photography. FIG.
FIG. 1 is a simplified cross-sectional view of a small transformer showing an example of this type of small winding component. Reference numerals 1 and 2 are E-shaped cores of the same shape made of ferrite material, 3 is a bobbin, 4 is a secondary coil, and 5 is a secondary coil. Primary coils 6, 6 and 7 are insulating coating materials, and 8 is a terminal pin embedded in the collar of the bobbin 3.

As shown in FIGS. 6A and 6B, the E-shaped core 1 has a yoke portion 1a, a central leg 1b, and left and right legs 1c integrally formed of a ferrite material, and the left and right legs 1c are a yoke. Extending from both ends of the portion 1a at right angles to the yoke portion 1a, a central leg 1b projects from the central portion of one surface of the yoke portion 1a in parallel with the left and right legs 1c. Further, the center leg 1b is formed so as to be offset so that its lower surface is flush with the lower surface of the rectangular yoke portion 1a. The E-shaped core 2 is the E-shaped core 1 described above.
It has the same shape as. The bobbin 3 has a rectangular tubular winding portion 3
a, end flanges 3b, 3c are formed on both sides of the winding portion 3a.

The secondary coil 4 is wound around the winding portion 3a of the bobbin 3 a number of times with a thin wire material, and an insulating coating material 6 is applied to the outer peripheral surface thereof. The secondary coil 4 is wound by a diagonal lap winding method which is a winding method for improving withstand voltage and efficiency. FIG. 7 is an explanatory view showing a winding method by the oblique lap winding. The secondary coil 4 is formed of a single wire rod including a first winding portion 4a, a second winding portion 4b, and a third winding portion 4c. The first winding portion 4a is
A forward winding of several turns is applied in the direction of the end flange 3c from the lowermost part of the inner surface of the end flange 3b, and a return winding is applied on this outward winding so as to reduce the number of turns of one turn. A forward winding is provided to reduce the number of turns of one turn, and the forward and backward windings are sequentially repeated to form a triangular cross-section layer in which the hypotenuse part forms an angle θ with respect to the axes of the cores 1 and 2. Formed as. The second winding portion 4b is formed by advancing the winding pitch in an oblique direction along the hypotenuse of the above-mentioned triangular cross-section layer.
The third winding portion 4c is wound from the lowermost portion of the inner surface of the end collar 3c so as to increase the number of turns by one turn each time the forward winding and the backward winding are repeated. It is formed as a triangular cross-section layer having an angle θ with respect to the axis of 2.

The primary coil 5 is formed by winding a thick wire several times on an insulating coating material 6 formed on the outer peripheral surface of the secondary coil 4. An insulating coating material 7 is applied to the outer peripheral surface of the primary coil 5, and an insulating coating material 9 is wound around the non-winding portion of the primary coil 5 formed on the right side of the primary coil 5. The winding start end and the winding end of the primary coil 5 and the secondary coil 4 are connected to the terminal pin 8.

[0006]

In the above-mentioned small transformer, the secondary coil 4 is wound by the oblique lap winding method. In this winding method, the secondary coil 4 is tilted with respect to the cylinder axis of the winding portion 3a. Since the winding is performed by winding the wire, the wire rod may slip on the outer surface of the winding portion to cause a positional deviation, or the wire rod wound on the upper layer may slip down on the lower layer to cause winding collapse. Such a positional displacement of the wire rod or a collapse of the winding wire is not preferable because it increases the voltage difference between the wires.

[0007]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems of small winding parts such as small transformers, and has a bobbin having a cylindrical winding portion and this bobbin. In a small electrical winding component consisting of a coil wound around the winding part of the bobbin and a core that has legs inserted into the winding part and assembled to the bobbin, the bobbin winding part has an outer surface with a slight slope. And the inner surface of the core is formed in a slant shape in parallel with the outer surface, and the leg portion of the core is formed by taper so that the leg surface is aligned with the slant shape of the inner surface of the winding portion of the bobbin. We propose a characteristic small electric winding component.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which the present invention is applied to a small transformer will be described with reference to the drawings. FIG. 1 shows the first embodiment of the present invention.
It is a longitudinal cross-sectional view of a small transformer showing an embodiment. This small transformer has an iron core composed of an E-shaped core 50 and an I-shaped core 51, a bobbin 52 having a rectangular tubular winding portion 52a, a primary coil 53 and a secondary coil. It is composed of a coil 54 and the like.

As shown in FIGS. 2A and 2B, the core 50 is an E-shaped core in which a yoke portion 50a, a central leg 50b, and left and right legs 50c are integrally formed of a ferrite material. E
Like the cores 1 and 2, the central leg 50b has a rectangular cross section such that the lower surface of the central leg 50b is flush with the lower surface of the yoke portion 50.
Are formed on one side.

The core 50 has a taper 50d formed on the central leg 50b. The taper 50d is shown in FIG.
As shown in (B), the left and right surfaces 50e and 5e of the center leg 50b.
1f and the upper and lower surfaces 50g, 50h are formed to have a slight downward slope from the base of the central leg 50b toward the tip.

The bobbin 52 has flanges 52b and 52c on both sides of a rectangular tubular winding portion 52a, and terminal pins 55 are planted in thick portions 52d and 52e formed below the flanges 52b and 52c. There is. The winding portion 52a described above has its inner and outer surfaces obliquely formed with a slight gradient. That is, the inner surface 52f of the winding portion 52a is formed in a slanted shape so as to match the central leg 50b of the core 50, and the outer surface 52g of the winding portion 52a is formed into the inner surface 5 described above.
It is formed in an oblique shape parallel to 2f.

The secondary coil 54 is wound by the diagonal lap winding method similar to the conventional example. That is, the secondary coil 54 has its winding start end entangled with the terminal pin 55, and one of the collars 52
A wire rod is obliquely overlapped and wound from the b side toward the other brim 52c side, and the winding end is twisted to the terminal pin 55 and wound around the bobbin 52.

The primary coil 53 is wound several times around the outer peripheral surface of the secondary coil 54 with a thick wire.

Between the primary coil 53 and the secondary coil 54 and on the outer peripheral surface of the primary coil 53, insulating coating materials 56 and 57 are applied, and the secondary coil 54 which is a non-winding portion of the primary coil 53.
An insulating coating material 58 is also wound around the outer peripheral surface of the.

In the small transformer described above, since the secondary coil 54 is obliquely overlapped and wound so that the inclination of the outer surface of the winding portion 52a rises, the wire rod of the secondary coil 54 is directed in the direction of the collar 52c during the winding process. There is no possibility of slippage and displacement, and since the center of gravity of the wound wire rod tilts toward the brim 52b, the upper wire rod does not slide down to the lower layer. It is possible to reliably prevent line breakage.

Further, a core 50 having a taper 50d formed on the central leg 50b so as to match the inner hole of the winding portion 52a.
Has good releasability when it is formed by vertical punching, and since the central leg 50b has a thick base portion, the central leg 50b is less likely to be damaged and the productivity of the core 50 is improved.

Further, the inner surface of the winding portion 50a is the core 50
Since the central leg 50b and the winding portion 52 are in close contact with each other, the core 50 is formed in an inclined shape that matches the leg surface of the central leg 50b.
Can be attached to the bobbin 52 without play.

FIG. 3 is a vertical sectional view of a small transformer showing a second embodiment of the present invention. This small transformer is EE.
It is a core transformer.

A bobbin 59 having a rectangular tubular winding portion 59a.
Two E-shaped cores 60, 61 of the same shape made of ferrite material are inserted into the inner holes of the winding portion 59a from both sides of the winding portion 59a.
The input side primary coil 62 and the output side secondary coil 6 are shown in a.
3, a terminal pin 64 in which the ends of the coils 62 and 63 are planted in the thick portion of the bobbin, and an intermediate collar 59d described later.
Are connected to the terminal pins 65 that are planted in.

The cores 60 and 61 are the core 50 of the first embodiment.
An E-shaped core similar to the above, but has tapers 60d and 61d formed on the respective central legs 60b and 61b.

The bobbin 59 comprises a rectangular tubular winding portion 59a, end flanges 59b and 59c formed on both sides of the winding portion 59a, and an intermediate flange 59d formed in the middle of the winding portion 59a. By the collar 59d, the first and second winding sections C,
D is formed.

The winding portion 59a described above has its inner and outer surfaces obliquely formed with a slight inclination. That is, the winding portion 59a
The inner surface 59e of the winding portion 59a, which is the first winding section C, is formed in a slanted shape in conformity with the leg surface of the central leg 60b of the core 60, and the outer surface 59f thereof is the inner surface 59e. It is formed in a slant shape that is parallel to. In addition, the inner surface 59g of the winding portion 59a which is the second winding section D is the core 6
The first central leg 61b is formed in a slanted shape in conformity with the leg surface, and its outer surface 59h is slanted in parallel with the inner surface 59g.

The secondary coil 63 is wound around the winding portion 59a by the oblique lap winding method. That is, bobbin 5
After winding the winding start end on the terminal pin 65 provided on the intermediate flange 59d of No. 9, it is wound on the first winding section C by the oblique lap winding method, and the winding end is twisted on the terminal pin 64 of the flange 59b. A part of the secondary coil 63 is formed in the winding section C, and then the winding start end is entangled with another terminal pin 65 provided on the intermediate flange 59d of the bobbin 59, and then the second winding section D is diagonally overlapped. Winding is performed according to the winding method, the winding end is entangled with the terminal pin 64 of the collar 59c to form a part of the secondary coil 63 in the second winding section D, and each secondary coil 63 part is formed with the terminal pin 65. A secondary coil 63 is formed by connection.

The primary coil 62 is formed by winding a thick wire several times around each of the first and second winding sections C and D, and the primary coil 62 portion is connected to each winding start end by a terminal pin 65.
It is formed by connecting by.

Reference numerals 60a and 61a in FIG.
Is a yoke portion, and 66, 67 and 68 are insulating coating materials. The same effect as in the first embodiment can be obtained with the above-mentioned small transformer.

FIG. 4 shows a third embodiment of the present invention, E-
It is an IE type core transformer. This small transformer is composed of an iron core consisting of two E-shaped cores 69 and 70 of the same shape and an I-shaped core 71, a bobbin 72, a primary coil 73 and a secondary coil 74. The I-shaped core 71 is a rectangular tube. It is fitted in the split groove 72c of the intermediate brim 72b formed in the middle of the winding portion 72a.

The E-shaped cores are the E-shaped cores 60 and 6 of the second embodiment.
The same as No. 1, but the taper is attached to the central legs 69b and 70b.
69d and 70d are formed.

The winding 72a of the bobbin 72 has an intermediate collar 72.
The inner surface 72d of the winding portion 72a, which is the first winding section E at the boundary of b, is formed in a slanted shape in conformity with the leg surface of the central leg 69b of the core 69, and the outer surface 72e thereof is slanted in parallel with the inner surface 72d. It is formed on. The inner surface 72f of the winding portion 72a, which is the second winding section F, is formed in an inclined shape that matches the leg surface of the central leg 70b of the core 70, and the outer surface 72g is formed in an inclined shape that is parallel to the inner surface 72f. ing.

The secondary coil 7 is attached to the winding portion 72a.
Similarly to the secondary coil 63 of the second embodiment, 4 is wound by the oblique lap winding method, and the primary coil 73 is wound on the outer peripheral surface of the secondary coil 64.

A primary coil 73 is provided on the thick portion formed below the end collars 72h and 72i of the bobbin 72 and the intermediate collar 72b.
And a plurality of terminal pins 75 connecting the winding start end and the winding end of the secondary coil 74 are connected.

Incidentally, reference numerals 69a and 70a in FIG.
Is a yoke portion, and 76, 77 and 78 are insulating coating materials. Even in this small transformer, the same effects as those of the first and second embodiments can be obtained.

In each of the above-mentioned embodiments, the bobbins 52, 59,
Although the entire outer surface of each winding portion of 72 is formed in a slanted shape, for example, only the upper and lower surfaces or the left and right surfaces of the outer surface of the winding portion may be formed in a slanted shape. The inner surface of the winding portion may be formed parallel to the outer surface thereof, and the E-shaped core inserted into the winding portion may be formed by forming a taper on the leg surface of the central leg according to the shape of the inner surface of the winding portion.

Further, although the above-mentioned respective embodiments are constituted by including an E-shaped core, the present invention is not limited to such an E-shaped core, and a pot core or a T-shaped core in which a leg portion is inserted into a winding portion and assembled to a bobbin. The present invention can be implemented even with a core or the like.

Further, although each of the above-mentioned embodiments is implemented by a small transformer, it can be implemented in the same manner as a choke coil.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a small transformer showing a first embodiment of the present invention.

FIG. 2 shows a core provided in the small transformer, and FIG.
2A is a plan view of the core, and FIG. 2B is a sectional view taken along the line AA in FIG.

FIG. 3 is a vertical sectional view of a small transformer showing a second embodiment of the present invention.

FIG. 4 is a vertical sectional view of a small transformer showing a third embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a small transformer showing a conventional example.

FIG. 6 shows a core included in a conventional small transformer, and FIG.
6A is a plan view of the core, and FIG. 6B is a sectional view taken along line BB in FIG. 6A.

FIG. 7 is an explanatory diagram showing a winding method of a conventional small transformer.

[Explanation of symbols]

 50 E-shaped core 50b Central leg 50d Taper 51 I-shaped core 52 Bobbin 52a Winding portion 52f Winding portion inner surface 52g Winding portion outer surface 53 Primary coil 54 Secondary coil 55 Terminal pin

Claims (1)

[Claims] 1. A small electric winding comprising a bobbin having a tubular winding portion, a coil wound around the winding portion of the bobbin, and a core inserted into the winding portion by inserting legs into the bobbin. In the wire component, the winding part of the bobbin is formed so that its outer surface is inclined with a slight slope, and its inner surface is formed obliquely with its outer surface being parallel to the outer surface. A small electric winding component, characterized in that it is formed by forming a taper in conformity with the oblique shape of the inner surface.