JPH0488610A - E-shaped core - Google Patents

Abstract

PURPOSE:To prevent the reduction in cross-sectional area in the complementary notched part of a yoke section against the cross-sectional area of a first side magnetic leg or a second side magnetic leg, and to prevent occurrence of magnetic saturation by a method wherein the width of the yoke part of an E-shaped core is made wider than the width of magnetic legs. CONSTITUTION:The width of the yoke part 55 of an E-shaped core 51 is made wider than the width of side magnetic legs 53 and 54, and the E-shaped surface of the core 51 is divided into a plurality of parts along the groove section 56 and 57 provided between the center magnetic leg 52 and side magnetic legs 53 and 54. On the E-shaped core 51, the center magnetic leg cut part 61a of the groove section 61 formed by cutting and the yoke cut part 61b are positioned on the same surface, and as a disc-like grinder is used, a tapered first side magnetic leg notched part 63 having a width of W5 and a second side magnetic notched part 64 are formed respectively on the first side magnetic leg 53 and the second side magnetic leg 54. At this time, a relation of W1<W4 is formed between the width W1 of the center magnetic leg cut part 61a and the width W4 of the yoke cut part 61b, and the left and right sections obtained by deducting W1 from W4 becomes the complementary notched part 60.

Description

Detailed Description of the Invention (Industrial Field of Application) This invention relates to transformers, choke coils, etc. (Prior Art) In recent years, there has been an increasing demand for miniaturization of electronic devices, especially when used outdoors or indoors. There is a demand for thin and lightweight electronic devices that can be carried and used.

Therefore, there is a strong demand for smaller and lighter transformers, choke coils, noise filters, and the like used in these electronic devices.

Therefore, there is a strong demand for thinner and lighter cores made of magnetic materials used as magnetic cores in transformers, choke coils, noise filters, etc., and various proposals have been made to date. 6. An E-type core is generally used as a magnetic core incorporated in the transformer, etc., and a conventional example of the E-type core will be described with reference to FIG.

The E-type core l made of a magnetic material such as ferrite has a first groove 6 and a second groove 7 on both sides of a central magnetic leg 2 having a substantially square cross section, and is connected to a pair of 16!1Fi11 legs 3 and 3. Second side ff1ll! 4 are arranged, and one end of each of the central magnetic leg 2, the first (1111!) leg 3, and the second side magnetic leg 4 are connected by a yoke portion 5.

At this time, the central magnetic leg 2, the first side M1! IA3 and 2nd
The other end surface of the side magnetic leg 4 is formed on the same plane, and
In order to optimize the magnetic properties of the E-shaped core I, the cross-sectional area of the central magnetic leg 2 is made equal to the sum of the cross-sectional areas of the first side magnetic leg 3 and the second side magnetic leg 4. is formed.

When the E-type core 1 is incorporated into a transformer or the like, a coil bobbin 8 made of a coil or the like wound with enameled wire or the like is fitted into the central magnet 12, as shown by the imaginary line in the figure. Further, the E plastic molding is combined with the type 1 core and fixed with a fixing fitting or the like (not shown).

When the coil bobbin 8 is fitted into the E-type core 1, the upper and lower windings of the coil bobbin 8 are 2. The center of the E-type core 1 ffi! 1112 protruded by two widths from the upper and lower surfaces, and therefore it could not be said that the dimensions of each part were utilized effectively in accordance with the structural design of the E-shaped core 1.

Moreover, when the transformer or the like is mounted on an electronic circuit board or the like, the protruding two-width winding portion serves as the mounting portion on the board or the like, resulting in problems such as poor stability.

For this reason, the E-type core has a structural design that makes effective use of the dimensions of each part while satisfying the condition that the cross-sectional area of the central magnetic leg is equal to the sum of the cross-sectional areas of the first side magnetic leg and the second side magnetic leg. has been devised, and this E-type core will be explained with reference to FIG.

The E-type core 11 has a central magnetic leg 12 elongated in the horizontal direction extending from the lower center of the front surface of the yoke part IS, and a first full 16 and a second full magnetic leg 12 on both sides of the central magnetic leg 12. 17, the first side magnetic leg 13 and the second side magnetic leg 14 are arranged,
One end of each of the first side magnetic leg 13 and the second side magnetic leg m14,
They are connected by the yoke portion 15.

Further, the E-shaped core 11 has the central magnetic leg 12, the first gs
The other end surfaces of the magnet 17113 and the second side magnetic leg 14 are formed on the same plane, and the lower surfaces of the central magnetic leg 12, the first gII magnetic leg 13, and the second side magnetic leg 14 are formed on the same plane. It is composed of:

A coil bobbin 18 is fitted into the central magnetic leg 12 of the E-type core 11, as shown by the imaginary line in the figure, and when combined with an E-type or I-type core, a transformer etc. It is beginning to form.

According to the E-shaped core 11, since the central magnetic leg 12 is elongated in the lateral direction, the height of the central magnetic leg 12 is equal to that of the first side magnetic leg 13. Second side magnetic leg 14 and yoke part 1
5, and therefore the central magnetic field 1111
2, so that the upper winding part of the coil bobbin 18 fitted in the central magnetic leg 12 is lower than the upper surface of the first magnetic leg 13, the second magnetic leg 14, and the yoke part 15. There is no protrusion, and thus the structure is designed to accommodate miniaturization of the E-shaped core 11.

The E-shaped core 11 is molded, for example, by press-molding a magnetic material using a double-acting press device (not shown) having a plurality of pressurizing surfaces.

According to the above-mentioned double-acting type press device, each pressurizing surface operates in a double manner to pressurize the magnetic material, so it is difficult to mold the magnetic material into a uniform density. There was a risk that microcracks or the like would occur in the E-shaped core 11 due to internal stress during the double-acting pressurization.

Furthermore, the double-acting press device is large, has complicated operation control, and has a slow molding speed, making it unsuitable for mass production.

For this reason, a method of manufacturing an E-type core as shown in FIGS. 11(a) to 11(d) has been proposed.

According to this method, a magnetic material is molded into a molding section 28 using a single-acting press device (not shown);
Cutting grooves 27a, 2 are formed in the molded member 28 using a lathe or the like, for example.
7b is cut (FIG. 7(b)).

Next, the molded member 28 is sequentially cut to a predetermined width (see FIG.
C)) By cutting the approximately central upper part of the cut piece, the first side magnetic leg 23 and the second side magnetic leg 24 are arranged and formed on both sides of the central magnetic leg 22, and the central magnetic leg - 22,
An E-shaped core 21 is manufactured in which a yoke portion 25 connecting one end of each of the first side magnetic leg 23 and the second side magnetic leg 24 is formed.

A cutting groove 26 is formed in the E-shaped core 21 by cutting, in which the central magnetic leg cutting part 26a and the yoke cutting part 26b are flush with each other, and the width of the yoke cutting part 26b of the cutting groove 26 is W4 is.

Thread cutting large portions 30 are formed wider than the width Wl' of the central magnetic leg cutting portion 26a, and are provided on both sides of the yoke portion cutting portion 26b.
was generally formed.

The E-shaped core 21 has a coil bobbin (not shown) fitted into the central magnetic leg 22, and is combined with other E-shaped or I-shaped cores to form a transformer or the like. .

At this time, since the cutting groove portion 26 is formed, as shown in FIG. 12, 5. Height H of the central magnetic leg 22
1' is H1' and H2' with respect to the height H2' of the first side magnetic leg 23 and the second inverted magnetic leg 24, so that the upper winding portion of the coil bobbin is This prevents the magnetic legs 23 and the second side magnetic legs 24 from protruding from the upper surface, contributing to stable mounting on an electronic circuit board, etc., and to a reduction in size and height.

According to the method for manufacturing the E-type core described above, there is no need to use the double-acting type press device, and the E-type core 21 can be manufactured using common equipment and processes.

Further, as shown in FIG. 13, the E-type core 31 having a different shape from the E-type core 21 has two cutting grooves 37a and 37bfjir on both sides of the central magnetic leg 32, respectively, and a pair of first side magnetic legs 33. A second side magnetic leg 34 is also arranged, and one end of each of the central magnetic leg 32, first side magnetic leg 33, and second side magnetic leg 34 is connected by a yoke portion 35.

Furthermore, in the E-type core 31, the central magnetic leg 32
The upper surface is cut to a height H1', and the yoke part 35 is cut to a height H3', which is higher than the height H1', with a tapered part 40 to form a cutting groove part 36. has been done.

In the cutting groove portion 36 of the E-shaped core 31, the upper surface of the cut central magnetic leg 32 and the upper surface of the yoke portion 35 were not formed on the same plane.

(Problem to be Solved by the Invention) However, according to the above-mentioned conventional E-type core, the width Wl' of the central magnetic leg cut part and the width W4' of the yoke part cut part are
By satisfying the relationship 1'<W4', a large thread-cutting portion is formed in the yoke part, and the width W2' of the first side magnetic leg and the second side magnetic leg and the width W3' of the yoke part are Approximately W2'
By having the relationship W3', the cross-sectional area of the thread cutting portion becomes smaller than the cross-sectional area of the first side magnetic leg and the second side magnetic leg, so that the first side magnetic leg and the second side magnetic leg The relationship in which the sum of the cross-sectional areas is equal to the cross-sectional area of the central magnetic leg cannot be maintained, and when a high load is not applied to a transformer etc. in which the E-type core is incorporated, the thread cutting large portion There is a problem in that magnetic saturation occurs below a predetermined characteristic value, and as a result, desired characteristics of the transformer or the like cannot be obtained.

In addition, in order to avoid magnetic saturation due to the thread cutting portion,
Even if the central magnetic leg and yoke portion are cut so that Wl' and W4' are approximately in the relationship W1'=W4',
Due to a slight deviation in the notch position during the cutting process, a convex portion that is not cut remains on the surface of the central magnetic leg, resulting in a poor appearance, so the cutting process requires high precision. However, there was a problem in that working efficiency was reduced due to the processing accuracy.

Furthermore, when assembling a transformer or the like by fitting a coil bobbin into the central magnetic leg of the E-shaped core, internal stress concentrates at the connecting portion between the central magnetic leg and the yoke portion during the assembly process. There is a problem in that the connecting portion or the like may be damaged.

Furthermore, in the assembly process of assembling a transformer etc. by fitting a line-symmetrical coil bobbin into the central magnetic leg of the E-shaped core, the coil bobbin is not temporarily fixed sufficiently;
There was a problem in that the assembly was hindered.

The present invention has been made in view of the above circumstances, and prevents magnetic saturation below a predetermined characteristic value due to a reduction in the cross-sectional area of the extra notch, and also eases processing accuracy by widening the extra notch. Furthermore, the present invention provides an E-type core that can be reliably assembled without fear of damaging connecting parts such as the central magnetic leg during the assembly process of transformers and the like.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a central magnetic leg, a pair of side magnetic legs arranged opposite to each other so as to sandwich the central magnetic leg, and a pair of side magnetic legs arranged opposite to each other so as to sandwich the central magnetic leg. In the E-type core, the E-shaped core has a yoke portion that connects one end and one end of each of the pair of side magnetic legs to each other, the width of the yoke portion being wider than the width of the side magnetic legs; The E-shaped surface of the mold core, the side magnetic leg,
In addition, the above object is achieved by dividing the magnetic pole into a plurality of parts along the groove provided between the central magnetic leg and the side magnetic leg.

(Function) In the present invention, by making the width of the yoke portion of the E-shaped core wider than the width of the side magnetic leg, the yoke is By preventing the cross-sectional area at the extra notch of the part from becoming small, even if a high load is applied to a transformer, etc. in which the E-type core is incorporated, the front It is possible to prevent occurrence of magnetic saturation below a predetermined characteristic value at the incised portion.

In addition, since the E-shaped surface of the E-shaped core is processed to be divided into a plurality of parts along the approximate center of the groove provided between the central magnetic leg and the side magnetic leg, cutting work is difficult. In this case, even if the notch position is slightly shifted, there is no risk that an uncut protrusion will remain on the surface of the central magnetic leg (and the appearance defect can be prevented).

Furthermore, by dividing the side magnetic leg portions of the E-shaped core into a plurality of parts, a cutout portion for locking the locking portion of the coil bobbin is formed, so that the coil bobbin can be fitted into the central magnetic leg of the E-type core. The internal stress at the time of cutting can be alleviated by the notch.

Furthermore, by locking the coil bobbin fitted to the central magnetic leg through the notch, the coil bobbin can be temporarily fixed during the process of assembling a transformer or the like.

(Example) Embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a perspective view showing an embodiment of an E-type core according to the present invention, FIG. 2(a) is a plan view showing an E-type core of the same embodiment, and FIG. 3(a) and 3(b) are perspective views showing a coil bobbin fitted to the E-type core of the same embodiment, and FIG. 4 is a cross-sectional view of the E-type core of the same embodiment. FIG. 5(a) is a perspective view showing a transformer configured by a mold core.

(b) is an explanatory diagram illustrating another embodiment of the E-type core according to the present invention, and FIGS.
FIGS. 7 and 8 are perspective views showing a part of the coil bobbin to be fitted into the E-type core according to the present invention.

The E-type core 51 shown in FIG. 1 is manufactured by the following steps.

Magnetic material is connected to a pair of side columns using a single-acting press device,
It is molded into a day-shaped molded member having a pair of common columns that connect both ends of the side columns, and a central common column that connects the center portions of the pair of side columns.

Along the central common column of the day-shaped molded member, the surfaces of the pair of side columns and the central common column are cut using a disk-shaped grinder or the like made of an abrasive material or the like.

At this time, the cutting process uses a disc type grinder whose ridge part has a curved shape, and the side end face of the disc type grinder is made to hang on the side pillar, and the disc type grinder is The cutting depth is determined by the installed height of the rotary shaft.

Further, since the press surface of the single-acting press device is flat-processed, the upper and lower surfaces of the pair of side columns, the pair of common columns, and the central common column of the day molded member form the same surface. are doing.

Next, a pair of E-shaped cores are manufactured by cutting the pair of common columns and the central common column of the day-shaped molded member approximately at the center.

As shown in FIG. 1, the E-type core 51 manufactured by the above method has a first groove 56 and a second groove 57 on both sides of the central magnetic leg 52, and has a first side magnetic leg 53 and a second groove 57. 2nd side magnet wJ5
4 are arranged, and one end of each of the central magnetic leg 52, the first side magnetic leg 53, and the second side magnetic leg 54 is connected by a yoke part 55, and furthermore, the central magnetic leg 52, the first side magnetic leg 53, and the second side magnetic leg A cutting groove portion 61 is formed by cutting the magnetic leg 52 and the yoke portion 55 .

The E-shaped core 51 has a central magnetic leg cut portion 61a of the cut groove portion 61 formed by the cutting process, and a yoke portion cut portion 6.
1b are on the same plane, and since the disk-type grinder is used, the first side magnetic leg 53 and the second side magnetic leg 54 are provided with a tapered first side magnetic leg having a width of W5. A leg notch 63 and a second side magnetic leg notch 64 are respectively formed.

At this time, the width W1 of the central magnetic leg cut portion 61a.

Between the width W4 of the yoke part cutting part 61b, Wl<W4.
There is a relationship such that the left and right parts obtained by subtracting Wl from W4 are the extra notches 60.

In the E-type core 5z, as can be seen with reference to FIG. 2(a), the width W2 of the first magnetic leg 53 or the second magnetic leg 54 and the width W3 of the yoke portion 55 are The relationship is W2<W
3, the yoke portion 55 is wider than the first side magnetic leg 53 and the 21111th magnetic leg 54.

That is, from the relationship W2<W3, the cross-sectional area of the extra notch 60 in the yoke portion 55 is equal to the first side magnet 1lI153.
In addition, the cross-sectional area of the central magnetic leg 52 is the sum of the cross-sectional areas of the first magnetic leg 53 and the second magnetic leg 11154. ing.

In addition, when cutting the central magnetic leg 52 and the yoke portion 55, a first side magnetic leg notch 63 having a width of W5 and a second side The magnetic leg notches 64 are formed respectively, but due to the relationship W2<W3, the cross-sectional area of the extra notches 60 is not smaller than the first side magnetic leg 53 and the 2111th magnetic leg 54.
In the cutting process, the cutting width and cutting depth of the cutting groove portion 61 are determined.

Further, as shown in FIG. 3(a), a coil bobbin 101 made of a coil etc. wound with enameled wire etc.
A fitting frame 95 is attached to both longitudinal ends of the winding frame 93 through which an insertion hole 94 into which the central magnetic leg 52 of the mold core 51 is inserted is formed, and the fitting frame 95 is supported by a pedestal 96. ing.

At this time, a first side magnetic leg notch 63 and a second side magnetic leg notch are formed by cutting on the 11111m1153 of the E-shaped core 51 and the second side magnetic leg 54 on both the left and right upper portions of the fitting frame 95. Locking protrusions LO3a and 103b having similar tapered shapes are formed so that the portion 64 is abutted and temporarily fixed.

Furthermore, the said stand! ! ! 96, an input/output bin 92 for transmitting and receiving electrical signals with the outside is installed in the lower part.

Therefore, the central magnetic legs 52 of the pair of E-shaped cores 51 are shown along the arrows in the figure. By fitting the first side magnetic leg 53 and the second side magnetic leg 54 to the coil bobbin 101, the central magnetic leg 52 is inserted into the first side magnetic leg 53 through the insertion hole 94, and
The side magnetic leg notch 63 and the second side magnetic leg notch 64 of the second side magnetic leg 54 are fixed and locked by locking protrusions 103a and 103b, respectively.

The state in which the coil bobbin 101 is assembled into the E-type core 51 as described above can be understood by referring to FIG. The first side magnetic leg 53 and the second side magnetic leg 5 are formed by cutting the cutting groove portion 61.
It is formed to have a lower height than the height H2 of No. 4.

That is, when the coil bobbin 101 (represented by imaginary lines) consisting of a coil or the like wound with enameled wire or the like is fitted into the central magnetic leg 52, one upper winding portion of the coil bobbin 1st side magnetic 1llII53 and 2nd side magnetic leg 54
can be prevented from protruding beyond the height H2.

According to the E-shaped core 51, there is a relationship of Wl<W4, and furthermore, the width of the entire notch 60 is equal to that of the first groove 56 and the second groove.
Since cutting is performed to approximately the center of the magnetic leg 57, even if the notch position is slightly shifted during the cutting, it is possible to prevent a convex portion that is not cut from remaining on the surface of the central magnetic leg 52.

Further, in the E-type core 51, all the notches 60 are formed on the left and right sides of the yoke section cut portion 61b due to the relationship Wl<W4, but since the E-type core 51 has the relationship W2<W3, the 1f-th
It is possible to prevent the cross-sectional area of the entire notch 60 from becoming smaller than the cross-sectional area of the magnetic leg 53 or the second side magnetic leg 64, and the magnetic Saturation can be avoided.

Further, a first side magnetic leg notch 63 and a second side magnetic leg notch 64 are formed in the first side magnetic leg 53 and the second side magnetic leg 54 of the E-type core 51, respectively, so that the coil bobbin:/lot The locking protrusions 103a and 103b hold the coil bobbin lot.
Because it is configured to lock, internal stress generated when fitting the central magnetic leg 52, first side magnetic leg 53, and second side magnetic leg 54 of the E-shaped core 51 to the coil bobbin 101 is prevented. can be dispersed and relaxed.

Further, the coil bobbin 101 is temporarily fixed to the E-shaped core 51 by abutting and locking the first side magnetic leg notch 63 and the second side magnetic leg notch 64 with the locking protrusions 103a and 103b, respectively. This makes it possible to assist in the assembly process of transformers, etc.

Furthermore, since the direction in which the first side magnetic leg notch 63 and the second side magnetic leg notch 64 abut against the locking protrusions 103a and 103b is determined uniformly, there is a possibility that the coil bobbin IO1 may be erroneously fitted in the mounting direction. can be prevented.

In addition, as shown in FIG. 3(b), the input/output bin 92
Alternatively, a coil bobbin 105 with frame leads 98 extending from the side surface of the pedestal 96 may be used. Next, an example in which a transformer is constructed using a pair of the E-type cores 51 described above will be described in the following. This will be explained with reference to FIG.

The E-type core 51 and another E-type core 51 paired with the E-type core 51
When the type cores are combined, the central magnetic leg 52 of the E-type core 51 is inserted into the insertion hole 94 of the coil bobbin 101 into which the coil 90 is fitted, and the 111A magnetic leg 53 and the second The transformer 100 is constructed by fitting or locking the side magnetic legs 54 and fixing them with fixing fittings (not shown) or the like.

Next, another embodiment of the present invention will be described with reference to FIGS. 3(a) and 3(b).

Note that the same reference numerals are given to the four parts as in the previous embodiment, and the explanation thereof will be omitted.

The first side magnetic leg S3 and the 2611th magnetic leg 54 are cut by a disc type grinder or the like whose ridge portion has a curved shape, and the first side magnetic leg notch 73 and the second magnetic leg have a curved shape. A side notch 74 is formed.

At this time, the cross-sectional area of the central magnetic leg 52 is the same as that of the first side magnetic leg 53.
The cutting process is performed while adhering to the rule that the cross-sectional area is the sum of the cross-sectional area of the magnetic head and the second side magnetic leg 54.

Furthermore, chamfered portions 76 and 77 are formed on the outer lower portions of the first side magnetic leg 53 and the second side magnetic leg 54.

As shown in FIG. 7, the E-type core 71 configured as described above has locking protrusions 113a and 113b having curved parts.
A coil bobbin 111 is used.

According to the E-shaped core 71, the same excellent effects as in the previous example m can be achieved.

Another embodiment of the present invention is shown in FIG. 6(a).

This will be explained with reference to (b).

Note that the same parts as in the previous embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

On the opposing surfaces of the first side magnetic leg 53 and the second side magnetic leg 54 of the E-type core 81, a tapered first side magnetic leg notch 83 and a second side magnetic leg notch are provided, respectively, from the upper surface to the cutting groove 61. 84 is formed.

A coil bobbin 121 having tapered locking protrusions 123a and 123b as shown in FIG. 8 is used for the E-shaped core 81.

The E-type core 81 configured as described above provides excellent effects similar to those of the previous embodiment.

Note that when iron powder is used as the magnetic material, a powder magnetic core is formed by pressure molding, and when ferrite powder is used, a binder is added to the ferrite powder and granulated. A ferrite core is formed by pressure molding and further firing.

(Effects of the Invention) Since the E-type core according to the present invention is configured as described above, it has the following effects: (1) The central magnetic leg cutting portion in the cutting groove portion of the E-type core The width W1 of the yoke part and the width W4 of the cutting part of the yoke part have a relationship of Wl<W4, and furthermore, by having left and right extra notch widths obtained by subtracting Wl from W4, it is possible to avoid notches during cutting. Even if the position is slightly off.

There is no risk of uncut protrusions remaining on the top surface of the central magnetic leg, which prevents appearance defects, and the cutting process does not require high precision, improving work efficiency. It has a great effect.

(2) Furthermore, by having the relationship Wl<W4, an extra notch is formed on the yoke portion, but the yoke In order to prevent the cross-sectional area of the extra notch from becoming small, the width W2 of the first slia IIl or second side magnetic leg and the width W3 of the central magnetic leg are made to have a relationship of W2<W3. Therefore, even if a large load is applied to a transformer or the like in which the E-type core is incorporated, it is possible to prevent magnetic saturation below the predetermined characteristics in the extra notch. It has the excellent effect of being able to prevent the desired characteristics of the transformer etc. from being impaired.

(3) Further, a first side magnetic leg notch and a second side magnetic leg notch are formed in the first side magnetic leg and the second side magnetic leg of the E-shaped core, respectively, so that the locking protrusion of the coil bobbin The coil bobbin is configured to be locked to disperse and relieve internal stress generated when the central magnetic leg, first side magnetic leg, and second side magnetic leg of the E-shaped core are fitted into the coil bobbin. This has the excellent effect of preventing damage to the E-shaped core when assembling a transformer or the like.

(4) Also, by abutting and locking the first side magnetic leg notch and the second side magnetic leg notch and the locking protrusion, respectively,
Since the coil bobbin can be temporarily fixed to the E-shaped core 51, it is possible to assist in the assembly process of transformers, etc., and it has the excellent effect of being able to perform reliable assembly.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of an E-type core according to the present invention. ! Figure 2 (a) is a plan view showing the E-type core of the same example, a sectional view showing the surface, Figure 3 (b) is a perspective view showing the coil bobbin fitted into the E-type core of the same example. Figure 4 is a perspective view showing a transformer constituted by the E-type core of the same embodiment, and Figures 5(a) and (b) are explanations explaining other embodiments of the E-type core according to the present invention. Figures 6(a) and 6(b) are explanatory diagrams illustrating other embodiments of the E-type core according to the present invention, and Figures 7 and 8 are diagrams showing the E-type core fitted into the E-type core according to the present invention. A perspective view showing a part of the coil bobbin, Fig. 9 and Fig. 1O.
The figure is a perspective view showing a conventional E-type core, Figures 11 (a) to (d) are explanatory diagrams explaining the manufacturing process of the conventional E-type core, and Figure 11112 is a partially cutaway cross-section of the conventional example. FIG. 13 is a cross-sectional view showing a partially cut away cross-section of another conventional example. Figure 2(b) shows the X-x section 5l of the E-type core of the same example.
・ 53 ・ 55 ・ 56 ・ 60 ・ 63 ・ 64 ・ ・E-type core, 52 ・ ・First side magnetic leg, 54 ・Yoke part, ・First groove, 57... Second groove, ・Full notch part, 61... Cutting groove part/first side magnetic leg notch part, - second side magnetic leg notch part. Central magnetic leg, ・Second side magnetic leg,

Claims (1)

[Claims] (1) A central magnetic leg, a pair of side magnetic legs arranged opposite to each other so as to sandwich the central magnetic leg, and a yoke portion that connects one end of the central magnetic leg and one end of each of the pair of side magnetic legs to each other. In the E-type core, the width of the yoke portion is made wider than the width of the side magnetic legs, and the E-shaped surface of the E-type core is connected to the side magnetic legs and the central magnetic leg. An E-type core characterized by being divided into a plurality of parts along a groove provided between the side magnetic legs.