JP2003243226A - Coil electronic component and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil electronic component which is provided with a core that is easily mass-produced, uniform in inductance value, and stable in bonding strength to a printed board when it is mounted on the board, and to provide its manufacturing method. <P>SOLUTION: A sheet of magnetic material or non-magnetic material is horizontally and vertically cut into the cores 1. A terminal electrode 2 is provided to each rear end of the core 1. A recess 4 whose depth is larger than the thickness of a winding 3 is provided by cutting on the rear of the core 1 between the electrodes 2, and another recess 5 of the same depth with the recess 4 is also provided by cutting on the front surface of the core 1. The circumferential part of the winding 3 is partially housed in the recesses 4 and 5, and the terminals 3a of the winding 3 are fixed to the terminal electrodes 2 respectively. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire-wound electronic component that can be surface-mounted on a printed circuit board and a method for manufacturing the same, and more particularly to a core structure and a method for manufacturing a core.

[0002]

2. Description of the Related Art A conventional wire-wound electronic component used as an inductor has a coil made of a highly conductive metal wire rather than a sintered body of metal powder, as compared with a laminated inductor having a coil embedded therein. Since it can be configured, it has a feature that a high Q value can be obtained. In such a wound inductor, the core made of a magnetic material or a non-magnetic material is
Conventionally, it has been obtained by molding a molding core material made of a magnetic or non-magnetic powder with a mold and then firing it.

FIG. 18A shows an example of a core 50 of a conventional wire-wound electronic component. As shown in FIG. 18B, the flange 51 of the core 50 molded and fired as described above.
Then, a silver paste is applied by dipping or the like and baked to complete the base electrode 52. Next, in FIG.
As shown in (C), after winding the winding wire 54 around the winding core 53 of the core 50, the winding ends that are the winding start and the winding end of the winding wire are welded, thermocompression-bonded or super-bonded to the base electrode 52. Bonding by sonic vibration or combination of these. Next, the base electrode 52 and the portion of the winding terminal that is welded to the base electrode 52 are electroplated to form a terminal electrode 55, and a resin or the like is applied to the upper surface of the collar 51, or a resin film is applied. By sticking on the upper surface, a plate 56 for automatic mounting by a mounter is formed on the printed circuit board and completed.

[0004]

As described above, the core 50 of the conventional wire-wound electronic component is obtained by molding the molding core material with a mold and firing the core material. However, there is a problem in that the mass production is poor and the mass production is poor. In addition, the size of the finished product varies from lot to lot due to the difference in the firing shrinkage of the core material, but in order to suppress this size variation as much as possible, it is necessary to prepare multiple molds even though they are products of the same standard. However, there is a problem that equipment costs will increase.

Further, since the mold is expensive, it is not possible to prepare a large number of molds. When selecting the mold size of the mold by back-calculating from the contraction rate data of the core material, two molds are required. If a die of an intermediate size of a certain die is required, it is necessary to produce the die with a size slightly larger or slightly smaller than a desired size. However, in the case of the type in which the winding wire 54 is wound around the core 50, the size of the winding core 53 is changed due to the shrinkage variation of the core material.
Unless the number of turns of 4 is adjusted, the inductance fluctuates as it is and stable production cannot be performed.

Further, as a conventional product, there is a product in which a core body is dented in a molding step using a mold, and after baking it, a silver paste is applied and then baking is carried out. The paste covers the recessed portions, and thus sufficient recesses cannot be formed or the recessed dimensions vary widely.

SUMMARY OF THE INVENTION In view of the above problems of the prior art, it is an object of the present invention to provide a wire wound electronic component and a manufacturing method that facilitate mass production of cores. Another object of the present invention is to provide a wire-wound electronic component having a structure in which a core having a desired size can be obtained and therefore the variation of the inductance value is small, and a method for manufacturing the same. Further, the present invention is
Another object of the present invention is to provide a wire-wound electronic component having a small variation in the dimensions of the base electrode and thus a stable fixing strength to the printed circuit board when mounted on the printed circuit board, and a manufacturing method thereof.

[0008]

A wire-wound electronic component according to claim 1 comprises a core cut out into a substantially rectangular shape by cutting a sheet made of a magnetic material or a non-magnetic material in the vertical and horizontal directions, and both end portions of the back surface of the core. A terminal electrode on the back surface, and a recess formed by cutting, which is deeper than the thickness of the winding, between the terminal electrodes on the back surface. A part of the winding portion of the winding is housed in each of the recesses and wound. It is characterized in that terminals at both ends of the wire are fixed to the terminal electrodes, respectively.

As described above, since the core is obtained by cutting out from the sheet, in the case of a core of a small wire-wound electronic component, by cutting the sheet vertically and horizontally, thousands of cores can be obtained at the same time. The property is improved.

The core of the wire wound electronic component of the present invention is
The core is formed by cutting out the sheet, and the recess that becomes the winding core is formed deeper than the winding by cutting, so the winding is a structure that is not exposed from the core, and the thickness of the winding electronic component is It can be set by the thickness of the core,
Can maintain high dimensional accuracy.

In the present invention, as the sheet, a copper-clad resin sheet or a ceramic sheet can be used as the core material, but a sheet obtained by laminating and pressing a plurality of green sheets can also be used. When this laminated pressure-bonded sheet is used, it is necessary to cut and then fire it as a core, but by adjusting the cutting dimensions and the like in consideration of the firing shrinkage of the core material, a core with high dimensional accuracy after firing can be obtained. . Further, since the terminal electrode or the base electrode thereof can be formed by cutting out, the dimensional accuracy of the terminal electrode is increased, and a wire-wound electronic component having sufficient fixing strength even when mounted on a printed board can be obtained.

According to a second aspect of the present invention, there is provided a wire-wound electronic component according to the first embodiment, wherein both side surfaces of the core have recesses formed by cutting so as to accommodate a part of a winding portion of the winding. .

As described above, since the side surface of the core also has the recess deeper than the thickness of the winding, the dimensional accuracy of the width between the side surfaces of the wire-wound electronic component can be improved.

According to a third aspect of the present invention, there is provided a wire-wound electronic component according to the first or second aspect, wherein each of the terminal electrodes is provided with a recess, and the winding terminal is conductively fixed to the recess.

By thus providing the terminal electrode with the recess and fixing the winding end to the recess, the end position of the winding is fixed, the variation of the inductance is reduced, and the protrusion is formed on the mounting surface of the collar. Does not appear and becomes flat, and the mounting on the printed circuit board is performed well.

According to a fourth aspect of the present invention, there is provided a wire-wound electronic component according to the third aspect, wherein each of the terminal electrodes is provided with a plurality of depressions, and one of the depressions is selected to electrically fix the winding terminal. And

As described above, by providing a plurality of depressions and selectively fixing the winding terminal to any one of them, the inductance can be finely adjusted and a more stable inductance value can be obtained. .

According to a fifth aspect of the present invention, there is provided a wire-wound electronic component according to any one of the first to fourth aspects, wherein each of the terminal electrodes and a winding terminal fixed to the terminal electrode are electroplated.

By electroplating the terminal electrode and the winding terminal in this manner, the surface of the terminal electrode with respect to the printed board becomes smooth, and the strength of fixation to the printed board can be further increased.

According to a sixth aspect of the present invention, there is provided a wire-wound electronic component according to any one of the first to fifth aspects, wherein the sheet includes a conductor green for forming a terminal electrode, wherein a back surface of a laminated pressure-bonded body of a green sheet contains a conductor powder. A sheet is fixed, and the core is formed by forming the grooves on the front and back surfaces of the sheet, cutting the sheet lengthwise and crosswise, and then firing.

As described above, when the green sheet is used as the sheet, wire-wound electronic parts having various magnetic permeability, dielectric constant and Q value can be obtained by selecting the material of the powder mixed with the green sheet. In addition, in a state in which green sheets are laminated and pressure-bonded before firing, using a dicer or the like,
The groove can be easily cut.

According to a seventh aspect of the present invention, there is provided a wire-wound electronic component according to any one of the first to fifth aspects, wherein the sheet is a copper-clad resin sheet or a ceramic sheet.

As described above, if the copper-clad resin sheet or the ceramic sheet is used as the sheet, the existing sheet can be used as the material.

A method of manufacturing a wire wound electronic component according to claim 8 is
Put vertical and horizontal cutting marks on the both sides of the sheet made of magnetic material or non-magnetic material at the same position on both sides,
Based on the cutting mark, on the front and back of the sheet, a plurality of grooves are cut at equal intervals in any of the vertical and horizontal directions,
A core is formed by cutting the sheet at equal intervals along a cutting line along the non-cutting portions on both sides of the groove and a cutting line perpendicular to the cutting line, and a winding is formed in the groove portion. Is wound, and terminals at both ends of the winding are fixed to terminal electrodes provided on both sides of the groove on the back surface.

With such a manufacturing method, mass productivity can be improved, variation in inductance value can be reduced by improving dimensional accuracy, and fixing strength to a printed circuit board can be improved.

A method of manufacturing a wire wound type electronic component according to claim 9 is
A quadrangular sheet made of a magnetic material or a non-magnetic material is cut along two lines adjacent to each other in the vicinity of the peripheral portion, and the cut side is used as a reference side, and the sheet is positioned on the basis of the reference side. Then, on the front and back surfaces of the sheet, a plurality of grooves are cut at equal intervals in any of vertical and horizontal directions, and the sheet is
By cutting line along the non-cutting portion on both sides of the groove, and by cutting at equal intervals along the cutting line perpendicular to the cutting line,
A core is formed, a winding is wound around the groove, and terminals at both ends of the winding are fixed to terminal electrodes provided on both sides of the groove on the back surface.

In this way, if two adjacent sides of the end portion of the material sheet are cut and positioned with the two sides as reference sides, the mark printing becomes unnecessary, the process is simplified, and the cost is reduced. Contribute to.

According to a tenth aspect of the present invention, there is provided the method of manufacturing a wire wound electronic component according to the eighth or ninth aspect, wherein the terminal electrode conductor is fixed to the back surface of the sheet at the stage of the sheet.

When the manufacturing method according to claim 8 or 9 is carried out, by fixing the conductor for the terminal electrode to the sheet in advance, as compared with the case where the terminal electrode conductor is retrofitted, grooves (recesses) for a large number of parts are formed. ) Can be formed simultaneously, mass productivity,
Dimensional accuracy and adhesion strength to the printed circuit board are improved.

According to an eleventh aspect of the present invention, in the method of manufacturing a wire wound electronic component according to the eighth or ninth aspect, a conductor green sheet for forming a terminal electrode containing conductor powder is fixed to the back surface of the laminated pressure-bonded body of green sheets. The core is obtained by forming the above-mentioned sheet by forming the groove on the front and back surfaces of the sheet, cutting the sheet lengthwise and crosswise, and then firing.

As described above, when the green sheet is used as the sheet, wire-wound electronic parts having various magnetic permeability, dielectric constant and Q value can be obtained by selecting the material of the powder mixed with the green sheet. In addition, in a state in which green sheets are laminated and pressure-bonded before firing, using a dicer or the like,
The groove can be easily cut.

According to a twelfth aspect of the present invention, in the method for manufacturing a wire wound electronic component according to the eighth or ninth aspect, the terminal electrode conductor is fixed to the back surface of the sheet at the stage of the sheet, and the conductive material is attached to the back surface of the sheet. It is characterized in that one or more grooves are formed in the body, which are recesses for conductively fixing the winding ends.

In the method of applying the silver paste after forming the depressions in the core element as in the prior art described above, the silver paste covers the depressions, so that sufficient depressions cannot be formed or the dimension of the depressions is small. It will vary greatly. On the other hand, as in the present invention, by providing a recess in the terminal electrode and fixing the winding terminal to the recess, the end position of the winding is fixed, variation in inductance is reduced, and the mounting surface of the collar is The protrusion does not appear and becomes flat, so that the mounting on the printed circuit board is favorably performed.

According to a thirteenth aspect of the present invention, there is provided a method for manufacturing a wire-wound electronic component according to any one of the eighth to twelfth aspects, in which one of the front and back surfaces of the sheet has a width other than that of a groove to be cut first. It is characterized by widening the width of the groove to be cut later.

As described above, when the groove is cut by the dicer, the groove cutting on the surface for cutting the groove later is performed by making the width of the groove on the surface to be cut first wider so that the dicer is pressed against the sheet. The sheet is prevented from being bent by the pressure, and the cutting dimension accuracy of the groove is improved.

According to a fourteenth aspect of the present invention, in the winding type electronic component manufacturing method according to any one of the eighth to thirteenth aspects, a groove deeper than a thickness of the winding is formed at a position corresponding to both side surfaces of the product core in the sheet. It is characterized in that a through slit is provided.

By providing such a through slit and cutting so that the portion of the through slit remains as a groove, it has an excellent width accuracy in which the core has a concave portion on the side surface and the winding does not protrude from the side surface. A wire wound electronic component can be provided.

According to a fifteenth aspect of the present invention, in the method for manufacturing a wire-wound electronic component according to any one of the eighth to fourteenth aspects, the width of the groove on the surface of the sheet is adjusted so as to correspond to the number of turns of the winding. It is characterized by doing.

As described above, by adjusting at least the groove on the front surface side of the sheet so as to have a width corresponding to the number of turns of the winding, the winding can be wound around the core in an orderly manner, and variations in the inductance value can be reduced. can do.

[0040]

1A is a side view showing an embodiment of a wire wound electronic component according to the present invention, and FIG. 1B is a perspective view showing a mounting state thereof on a printed circuit board. This wire wound type electronic component is produced by cutting the core 1 into a substantially rectangular shape by cutting a sheet made of a magnetic material or a non-magnetic material in the vertical and horizontal directions. On the back surface of the core, that is, at both ends of the mounting surface to the printed board 7 shown in FIG. 1B, terminal electrodes 2 for fixing to pads on the printed board 7 with solder 8 are provided.

Further, recesses 4 and 5 formed by cutting are formed deeper than the thickness of the winding wire 3 between the terminal electrodes 2 and 2 on the back surface and on the front surface. A part of the winding portion of the winding 3 is housed in each of the recesses 4 and 5, and the ends 3a at both ends of the winding are accommodated.
Are electrically conductively fixed to the terminal electrodes 2. Reference numeral 6 denotes a surface smoothing plate which is fixed to the surface of the core 1 with a resin after the winding 3 is applied to the core 1, and is mounted on a printed circuit board by adsorbing it to a mounter.

An example of a method of manufacturing the wire wound electronic component according to the present embodiment will be described with reference to FIGS. This method
It uses a green sheet. FIG. 2A shows a state before stacking the green sheets, with the side which is the back surface in the product state facing up. Reference numeral 9 denotes an insulator green sheet, and the green sheet 9 is formed into a sheet by mixing magnetic powder or non-magnetic powder with a binder and a solvent and molding. The required number of green sheets 9 is prepared to obtain the thickness of the core.

When a non-magnetic material is used as the insulator green sheet 9, for high frequencies, in order to reduce the distributed capacitance, alumina, cordierite, which has a relative dielectric constant of 30 or less,
It is preferable to use umlite, low dielectric constant glass, or the like, but in the present embodiment, a glass composition of strontium, calcium, alumina, silicon oxide 70%, alumina 30% (all by weight) is used as a ceramic composition. Was used.

Reference numeral 10 is a conductor green sheet for forming the terminal electrode 2. The green sheet 10 is formed into a sheet by mixing, for example, silver or silver alloy powder, glass powder, a binder and a solvent. Is. In the examples, the materials were blended so that the silver content was 47% by volume in the composition after firing. Cut marks 11 that serve as a reference at the time of cutting are formed on the green sheet 10 at equal intervals around the green sheet 10. Reference numeral 12 is a film that is peeled off after lamination and pressure bonding, and is a conductor green sheet 1 of a lamination pressure bonding sheet of the conductor green sheet 10 and the insulator green sheet 9.
It is for marking the cutting mark 13 on the surface opposite to 0.

The green sheets 9 and 10 shown in FIG.
And the film 12 is overlapped and pressure-bonded as shown in FIG. After pressure bonding, the film 12 is peeled off.

The laminated pressure-bonded sheet 14 shown in FIG. 2 (B) thus obtained is dried and then dried in a bottom view of FIG. 3 (A).
As shown in the side view of FIG. 3B, the surface of the conductor green sheet 10 side is cut at equal intervals with the dicing mark 11 as a reference to form grooves 4A to be the recesses 4. The conductor portion 2A remaining without cutting the groove 4A is the portion that becomes the terminal electrode 2.

Next, as shown in the plan view of FIG. 4 (A) and FIG. 4 (B), a groove 5A to be the concave portion 5 is cut on the surface of the laminated pressure-sensitive adhesive sheet 14 with the cutting mark 11 as a reference. Form.

Next, as shown in the plan view of FIG. 5A, the side view of FIG. 5B, and the partial bottom view of FIG. 5C, the groove 5A (4A) with the cutting mark 13 as a reference. ), The portions not having grooves are cut at equal intervals along a vertical cutting line 15 in the drawing, and further at equal intervals along a cutting line 16 that is perpendicular to the cutting line 15 with the cutting mark 11 as a reference. The core 1 for each individual electronic component is obtained by cutting into individual pieces.

This cutting operation is performed by fixing the laminated pressure-bonded sheet 14 to a heat-peelable release sheet (not shown), and then peeling the green core from the release sheet and water barreling. After drying, the core was completed by baking at about 900 ° C.

Next, after winding on the core 1, both ends of the winding 3 were thermocompression-bonded to the terminal electrodes 2 and electrolytic plating was performed, and then the automatic mounting plate 6 was fixed to the surface of the core 1 with resin. The electroplating in the fixed state to the terminal electrode 2 and the winding terminal 3a was performed with copper, nickel and tin in this order. In addition, a multi-layer structure in which nickel and tin, nickel and gold, nickel and palladium and gold, nickel and palladium and silver, nickel and silver, and the like are plated in the order described can be used. By electroplating the terminal electrode 2 and the winding terminal 3a in this manner, the surface of the terminal electrode 2 with respect to the printed board 7 becomes smooth, and the strength of fixation to the printed board can be further increased.

In the wire wound electronic component of this embodiment, the core is obtained by cutting out from the sheet 14. Therefore, in the case of a core of a small wire wound electronic component, several thousand pieces are simultaneously cut by cutting the sheet 14 vertically and horizontally. One core can be obtained, and mass productivity is improved. For example, 1.6 mm x 0.8 mm x 0.8
In the case of the mm size inductor, it is possible to obtain about 6000 to 10000 cores from one sheet 14.

Further, in the core 1 of the wire wound type electronic component of the present embodiment, the core 1 is formed by cutting out the sheet 14, and the recesses 4 and 5 which are the cores around which the winding 3 is wound are cut to form the winding 3. Since the winding 3 is formed deeper than the thickness of the core 1, the winding 3 is not exposed from the front and back surfaces of the core 1, and the thickness dimension of the wire-wound electronic component can be set by the thickness of the core, and high dimensional accuracy can be maintained.

When the green sheets are laminated and pressure-bonded to be used as a sheet before cutting and cutting as in the present embodiment, it is necessary to cut the core and fire it.
The cutting interval (cutting mark 1
By adjusting the intervals between 1 and between the cutting marks 13, a core with high dimensional accuracy after firing can be obtained. Also,
Since the conductor green sheet 10 having a predetermined thickness is pressure-bonded to the green sheet in advance and the base electrode is formed by cutting out, the dimensional accuracy of the terminal electrode 2 is increased and the printed circuit board 7
A wire-wound electronic component having a sufficient fixing strength can be obtained even when mounted on.

As in the present embodiment, if a green sheet laminated and pressure-bonded is used, various magnetic permeability, dielectric constant and Q can be selected by selecting the material of the powder to be mixed with the green sheet.
It is possible to obtain a wire-wound electronic component of value. In addition, the grooves can be easily cut by a dicer or the like in a state where the green sheets are laminated and pressure-bonded and before firing.

Further, in the present embodiment, the groove 5A to be cut after the width a of the groove 4A (recess 4) to be cut first is used.
The width b of the (recess 5) is increased (see FIG. 1A).
However, this is intended to: FIG. 6 shows groove 4
A dicer 17 is used for cutting A and 5A, and grooves 4A, in response to the difference in firing shrinkage between lots of green sheet material,
In order to change the width of 5A, after cutting the entire length of the grooves 4A and 5A, the position of the dicer 17 is slightly moved and the cutting is performed again so that a predetermined groove width is obtained. By thus performing the cutting twice for each groove, it is possible to perform cutting with an arbitrary width by using one dicer 17, which is more economical than using dicers with various widths. Is achieved.

Since cutting is performed by the dicer 17 as shown in FIG. 6, when the cutting of the groove 5A to be cut later is partially performed, as shown on the left side and the right side of the upper part of FIG. If the width is less than or equal to the width of the groove 4A, the groove 4 previously cut
Since the portion A is thin and there is no support, the sheet may be bent at that portion and the groove 5A may not be cut well. However, if the width of the groove 5A to be cut later is set to be larger than the width of the groove 4A to be cut first as in the present embodiment, the portion facing the dicer 17 is cut in the groove 4A when the groove 5A is cut. Since the other portion is included, the facing portion other than the groove 4A serves as a support, the bending of the cut portion of the sheet 14 is prevented, and the cutting can be performed in a good state.

FIG. 7 (A) is a side view showing another embodiment of the wire wound type electronic component according to the present invention, and FIG. 7 (B) is an end view showing the core thereof. In the present embodiment, a terminal is used. A recess 19 is provided in the electrode 2, and the winding terminal 3a is conductively fixed to the recess 19.

As described above, by providing the recess 19 in the terminal electrode 2 and by electrically conductively fixing the winding terminal 3a to the recess, the end position of the winding 3 is fixed and variation in inductance is reduced. At the same time, no protrusion appears on the mounting surface of the tsuba, and the flange becomes flat, so that the mounting on the printed circuit board is favorably performed.

8 to 10 show the manufacturing process of the core having the terminal electrode structure shown in FIGS. 7 (A) and 7 (B). When manufacturing this core, first, as shown in the bottom view of FIG. 8 (A) and the end view of FIG. 8 (B), on the surface of the conductor green sheet 10 of the laminated pressure-bonded sheet 16, a thin recess is formed. The groove 19A is cut.

Next, as shown in the bottom view of FIG. 9A, the end view of FIG. 9B, and the side view of FIG. 9C, the grooves 4A are equally spaced in the direction orthogonal to the grooves 19A. To cut. Next in FIG.
0 (A) plan view, FIG. 10 (B) end view, FIG.
As shown in the side view of (C) and the partial bottom view of FIG. 10, the core 1 is cut at equal intervals along a cutting line 15 parallel to the grooves 4A and 5A and a cutting line 16 orthogonal to the cutting line 15.
To get

FIG. 7C is a modification of FIG. 7B,
A plurality of (three in the illustrated example) the depressions 19 are provided, and any one of these depressions 19 is electrically conductively fixed to the winding terminal 3a so that the inductance value can be adjusted.

As described above, by providing a plurality of recesses 19 and selectively fixing the winding terminal 3a to any one of them, the inductance can be finely adjusted and a more stable inductance value can be obtained. You can

FIG. 11 shows another embodiment of the wire-wound electronic component of the present invention, and (A), (B) and (C) are a plan view, a side view and an end view of the core, respectively. In the present embodiment, the recesses 20 deeper than the thickness of the winding wire 3 are formed on the side surfaces of the core 1.
Is provided.

According to this structure, as shown in the side view of FIG. 11 (D), not only the winding 3 does not protrude from the front and back surfaces of the core 1, but also as shown in the plan view of FIG. 11 (E). Since the winding 3 does not project from both side surfaces of the core 1, the dimensional accuracy of the side surface in the width direction is also improved.

12 and 13 are views showing steps of manufacturing the wire-wound electronic component of FIG. First, FIG. 12 (A),
As shown in the plan view and side view of FIG.
Grooves 4A and 5A in the laminated pressure-sensitive adhesive sheet 14 obtained by cutting A
The cut mark 13 or 11 is used in the portion provided with, and a through slit is formed in the portion indicated by 20A by mechanical punching or laser.

Next, as shown in the plan view, side view and partial bottom view of FIGS. 13 (A), (B) and (C), the grooves 4A, 5
The core 1 is obtained by cutting along the cutting line 15 parallel to A and the cutting line 16 orthogonal to this at equal intervals.

The bottom and side views of FIGS. 14A and 14B show another embodiment of the manufacturing method according to the present invention.
As described above, as the laminated pressure-bonding sheet 14A, one not having the conductor green sheet 10 is used, and after cutting the groove 4A, the conductor layer 21 is processed into the groove 4A by printing a conductor paste containing silver or silver alloy powder. The groove 5A is provided in a portion (protruding portion) which is not formed, and thereafter, the groove 5A is processed as in the above-described embodiment, and further, the through slit 20A shown in FIG. ,
Cut along 16 to obtain the core. The conductor paste may be printed on one green sheet on the bottom surface in advance or on a laminated pressure-bonded sheet having no conductor green sheet before processing the groove 4A. Further, the core 1 may be coated with a conductor paste after cutting and baked.

FIG. 15A is a plan view showing another embodiment of the manufacturing method of the present invention, and FIG. 15B is a side view thereof. In this embodiment, a resin sheet or a resin sheet or a ceramic sheet mixed with magnetic powder or non-magnetic powder is used as the sheet 22, and the grooves 4A and 5A are cut into the sheet, and then the cutting line 15 is used. 1
The core 1 having no terminal electrode 2 is manufactured by cutting along the line 6, and then the terminal electrode 2 is provided by plating or baking.

In any of the embodiments shown in FIGS. 14 and 15, it is possible to obtain a wire wound electronic component with high dimensional accuracy. In the embodiment of FIG. 15, if a copper-clad sheet in which a conductor sheet is previously fixed to a resin plate or the like is used, the work of plating the conductor for the terminal electrode 2 becomes unnecessary.

FIG. 16 shows another embodiment of the wire wound type electronic component and the manufacturing method thereof according to the present invention.
As shown in (C), when the number of turns of the winding wire 3 is smaller than that of the recessed portion 5 on the surface, the winding wire 3 is bent and the variation in the inductance increases, and the yield decreases. Therefore, as shown in FIGS. 16A and 16B, the concave portion 5 on the surface is formed.
By setting the widths b1 and b2 of the windings to a width corresponding to the number of turns, the winding portions on the core surface of the winding 3 are aligned, thereby preventing the winding from bending and improving the yield by aligning the inductance. It was done.

Further, in FIG. 16D, the width a1 of the recess 4 on the back surface side of the terminal electrode 2 is set to a width corresponding to the number of turns of the winding 3, so that the bending of the winding is further prevented and the yield is further increased. It is intended to improve.

FIG. 17 is a process drawing showing another embodiment of the method for manufacturing a wire wound electronic component of the present invention. In this manufacturing method, as shown in FIG. 17A, a line 23 orthogonal to two adjacent sides in the vicinity of the peripheral portion of the rectangular sheet 14,
24 along the line 24 and the cut side is the reference side 14
x and 14y. Next, as shown in FIGS. 17B and 17C, when the grooves 4A and 5A are cut on the back and front surfaces, the reference sides 14x and 14y are aligned with the vertical and horizontal reference positions X and Y, and the sheet 14 is cut. Position the groove 4 at regular intervals.
A and 5A are cut. After processing the grooves 4A and 5A as shown in FIG.
Similarly, when cutting along the reference lines 14x and 14y
Is cut according to the reference positions X and Y.

In this way, if two adjacent sides of the end portion of the material sheet are cut and positioned with the two sides as the reference sides, the mark printing becomes unnecessary, the process is simplified, and the cost is reduced. Contribute to.

[0074]

According to the first aspect of the present invention, since the core is obtained by cutting out from the sheet, in the case of a core of a small wire-wound electronic component, thousands of cores are obtained at the same time by cutting the sheet vertically and horizontally. Therefore, mass productivity is improved. Also,
Since the recess that is the core of the winding is formed deeper than the winding by cutting, the winding is not exposed from the core, and the thickness of the wire-wound electronic component can be set by the thickness of the core. , High dimensional accuracy can be maintained.

When a core is produced using this laminated pressure-bonded sheet, a core with high dimensional accuracy after firing can be obtained by adjusting the cutting interval in consideration of the firing shrinkage of the core material. Further, since the terminal electrode or the base electrode thereof can be formed by cutting out, the dimensional accuracy of the terminal electrode is increased, and a wire-wound electronic component having sufficient fixing strength even when mounted on a printed board can be obtained.

According to the second aspect, since the side surface of the core also has a recess deeper than the thickness of the winding, the width between the side surfaces of the winding-type electronic component can be maintained with high dimensional accuracy.

According to the third aspect, since the terminal electrode is provided with the depression and the winding terminal is electrically conductively fixed to the depression,
The end position of the winding is fixed, the variation of the inductance is reduced, and the mounting surface of the collar is flat without any protrusions, so that the mounting on the printed circuit board is favorably performed.

According to the present invention, the terminal electrode is provided with a plurality of depressions, and the winding terminal is selectively fixed to any one of the depressions. Therefore, the inductance can be finely adjusted, which is more stable. Inductance can be obtained.

According to the fifth aspect, since the winding end and the winding end are electroplated, the surface of the terminal electrode with respect to the printed circuit board becomes smooth, and the fixing strength to the printed circuit board can be further increased.

According to the sixth aspect, since the green sheet is used as the sheet, the wire-wound electronic component having various magnetic permeability, dielectric constant and Q value can be obtained by selecting the material of the powder mixed with the green sheet. it can. In addition, the grooves can be easily cut by a dicer or the like in a state where the green sheets are laminated and pressure-bonded and before firing.

According to the seventh aspect, since the copper-clad resin sheet or the ceramic sheet is used as the sheet,
Existing sheets can be used for the material.

According to the eighth aspect, the mass productivity can be improved, the variation in the inductance can be reduced by the improvement in the dimensional accuracy, and the fixing strength to the printed board can be improved.

According to the ninth aspect, the two adjacent sides of the end portion of the sheet as the material are cut and the positioning is performed with the two sides as the reference sides. Therefore, the printing of the mark becomes unnecessary and the process is simplified. Contribute to cost reduction.

According to the tenth aspect, since the terminal electrode conductor is fixed to the sheet in advance and the groove is cut or the core is cut, a large number of terminal electrode conductors are provided as compared with the case where the terminal electrode conductor is attached later. Grooves (recesses) can be simultaneously formed for each piece, and mass productivity, dimensional accuracy, and adhesion strength to a printed circuit board are further improved.

According to the eleventh aspect, since the green sheet is used as the sheet, a wire-wound electronic component having various magnetic permeability, dielectric constant and Q value can be obtained by selecting the material of the powder mixed with the green sheet. it can. In addition, the grooves can be easily cut by a dicer or the like in a state where the green sheets are laminated and pressure-bonded and before firing.

According to the twelfth aspect, since the terminal electrode is provided with the recess and the winding terminal is conductively fixed to the recess, the terminal position of the winding is fixed, the variation of the inductance is reduced, and the collar is mounted. No protrusion appears on the surface, it becomes flat,
Good mounting on a printed circuit board.

According to the thirteenth aspect, since the width of the groove is widened when the groove is cut later, when the groove is cut by the dicer, the sheet is prevented from being bent by the pressing pressure of the dicer against the sheet. The cutting dimension accuracy of the groove is improved.

According to the fourteenth aspect, since the through slit is provided in the sheet as the material and cutting is performed so that the through slit portion remains as a groove, the core has a concave portion on the side surface and the winding protrudes from the side surface. A wire-wound electronic component that is excellent in terms of width accuracy can be configured.

According to the fifteenth aspect, since at least the groove on the front surface side of the sheet is adjusted to have a width commensurate with the number of turns of the winding, the winding can be wound around the core in an orderly manner, and the inductance value varies. Can be reduced and the yield can be improved.

[Brief description of drawings]

FIG. 1A is a side view showing an embodiment of a wire-wound electronic component according to the present invention, and FIG. 1B is a perspective view showing its mounting state on a printed circuit board.

FIG. 2A is a perspective view showing a state before stacking of the green sheets in the case where the wire-wound electronic component according to the present embodiment is manufactured by a sheet method, with a back surface side being a top side in a product state, B) is a perspective view showing a state after the lamination pressure bonding.

3A is a bottom view showing a state after groove cutting of the laminated pressure-bonded sheet in the manufacturing process of the present embodiment, and FIG. 3B is a side view thereof.

4A is a plan view showing a state after cutting grooves on the surface of the laminated pressure-sensitive adhesive sheet of FIG. 3, and FIG. 4B is a side view thereof.

5A is a plan view showing a cutting line of the laminated pressure-bonded sheet of FIG. 4, FIG. 5B is a side view showing a state after cutting, and FIG. 5C is a partial bottom view thereof.

FIG. 6 is a diagram illustrating a step of cutting the groove of the core of the wire wound electronic component of the present embodiment.

7A is a side view showing another embodiment of the wire wound electronic component of the present invention, FIG. 7B is an end view of the core thereof, and FIG.
[Fig. 11] is an end view showing a modified example of (B).

8A is a bottom view showing a state in which a groove for forming a recess in a terminal electrode is cut in the wire-wound electronic component of FIGS. 7A and 7B, and FIG. 8B is an end view thereof. is there.

9A is a plan view showing a state in which a groove for forming a recess is cut in the laminated pressure-bonded sheet of FIG. 8, and FIG. 9B is an end view thereof.
(C) is the side view.

10 (A) is a plan view showing a cutting line of the laminated pressure-bonded sheet of FIG. 9, and (B), (C), and (D) are end views, side views, and partial bottom views showing states after the cutting, respectively. It is a figure.

FIG. 11 shows another embodiment of the wire-wound electronic component of the present invention, in which (A), (B), and (C) are a plan view, a side view, an end view, and (D) of the core, respectively. , (E) are a side view and a plan view showing a state after the winding is applied.

12 is a plan view showing positions of through slits of the laminated pressure-bonded sheet for obtaining the wire-wound electronic component of FIG. 11, and FIG. 12 (B) is a side view thereof.

13A is a plan view showing a cutting line of the laminated pressure-bonded sheet of FIG. 12, and FIGS. 13B and 13C are a side view and a partial bottom view showing a state after the cutting, respectively.

FIG. 14 is a plan view of a laminated pressure-bonded sheet showing another embodiment of the manufacturing method according to the present invention, and (B) is a side view thereof.

FIG. 15 is a plan view showing a cutting line of a sheet showing another embodiment of the manufacturing method according to the present invention, (B) is a side view thereof,
(C) is the partial bottom view.

16 (A) and 16 (B) are side views of a wire-wound electronic component according to another embodiment of the present invention, and FIG. 16 (C) is a problem in the wire-wound electronic component when the number of windings is small. FIG. 4D is a side view for explaining the above, and FIG. 9D is a side view showing a modified example of FIGS.

17A to 17D are process diagrams showing another embodiment of the method for manufacturing a wire-wound electronic component of the present invention.

18A is a side view showing a core of a conventional wire-wound electronic component, FIG. 18B is a side view showing a state after the terminal electrodes are attached, and FIG. 18C is a side view showing the product.

[Explanation of symbols]

1: core, 2: terminal electrode, 2A: conductor part, 3: winding,
3a: Winding end, 4, 5: concave part, 4A, 5A: groove, 6:
Sheet for automatic mounting, 7: Printed circuit board, 8: Solder,
9: Insulator green sheet, 10: Conductor green sheet, 11, 13: Cut mark, 12: Film, 14:
Laminated pressure-bonded sheet, 14A: sheet, 14x, 14y: reference position, 15, 16: cutting line, 17: dicer, 19:
Dimple, 19A: groove, 20: recess, 20A: through slit, 22: sheet, 23.24: cutting line

Claims (15)

[Claims] 1. A core provided by cutting a sheet made of a magnetic material or a non-magnetic material into a substantially rectangular shape by cutting in a vertical and horizontal direction, and having terminal electrodes at both ends of the back surface of the core, and between the terminal electrodes on the back surface. And the surface has a recess that is deeper than the thickness of the winding and formed by cutting. Part of the winding portion of the winding is housed in each of the recesses, and the ends of the winding are fixed to the terminal electrodes, respectively. A wire-wound electronic component characterized by the following. 2. The winding-type electronic component according to claim 1, wherein both side surfaces of the core have recesses formed by cutting so as to accommodate a part of a winding portion of the winding. Wirewound electronic components. 3. The wire-wound electronic component according to claim 1, wherein each of the terminal electrodes is provided with a recess, and the winding terminal is conductively fixed to the recess. 4. The winding-type electronic component according to claim 3, wherein each of the terminal electrodes is provided with a plurality of depressions, and one of the depressions is selected to electrically fix the winding terminal. Wire wound type electronic parts. 5. The winding-type electronic component according to claim 1, wherein the terminal electrodes and the winding terminals fixed to the terminal electrodes are electroplated. Linear electronic components. 6. The wire wound electronic component according to claim 1, wherein the sheet is provided on the back surface of the green sheet laminated crimp body.
A conductor green sheet for forming a terminal electrode containing a conductor powder is fixed, and the core is formed by forming the grooves on the front and back surfaces of the sheet, cutting it vertically and horizontally, and then firing. Wire wound type electronic parts. 7. The wire-wound electronic component according to claim 1, wherein the sheet is a copper-clad resin sheet or a ceramic sheet. 8. A vertical and horizontal cutting mark is provided on both sides of a sheet made of a magnetic material or a non-magnetic material at positions corresponding to the front and back sides, respectively, and the front and back surfaces of the sheet are vertically and horizontally oriented with reference to the cutting mark. Cutting a plurality of grooves at equal intervals in that direction, and cutting the sheet at equal intervals along a cutting line along the non-cutting portions on both sides of the groove and a cutting line perpendicular to the cutting line. To form a core, wind a winding around the groove, and fix terminals at both ends of the winding to terminal electrodes provided on both sides of the groove on the back surface. Production method. 9. A rectangular sheet made of a magnetic material or a non-magnetic material is cut along two lines adjacent to each other in the vicinity of a peripheral portion thereof along a line orthogonal to each other, and the cut side is set as a reference side, and the reference side is set as a reference. As the positioning of the sheet, the front and back surfaces of the sheet, a plurality of grooves are cut at equal intervals in any of vertical and horizontal directions, the sheet, a cutting line along the non-cutting portion on both sides of the groove, and the cutting A core is formed by cutting at equal intervals along a cutting line perpendicular to the line, winding is wound around the groove portion, and terminals at both ends of the winding are provided on both sides of the groove on the back surface. A method of manufacturing a wire-wound electronic component, characterized in that it is fixed to a terminal electrode. 10. The method for manufacturing a wire-wound electronic component according to claim 8 or 9, wherein a conductor for a terminal electrode is fixed to the back surface of the sheet at the stage of the sheet. 11. The method for manufacturing a wire wound electronic component according to claim 8 or 9, wherein a conductor green sheet for forming a terminal electrode containing conductor powder is fixed to the back surface of the laminated pressure-bonded body of the green sheet. The method for producing a wire wound electronic component, wherein the groove is formed on the front and back surfaces of the sheet, and the core is obtained by cutting the sheet in the vertical and horizontal directions and firing. 12. The method for manufacturing a wire-wound electronic component according to claim 8, wherein a conductor for a terminal electrode is fixed to the back surface of the sheet at the stage of the sheet, and the conductor is provided on the back surface of the sheet. A method for manufacturing a wire-wound electronic component, comprising forming one or more grooves, which are recesses for conductively fixing winding ends. 13. The method for manufacturing a wire-wound electronic component according to claim 8, wherein the width of the groove that is first cut on any one of the front and back surfaces of the sheet is larger than the width of the other surface. A method for manufacturing a wire-wound electronic component, comprising widening a groove to be cut later. 14. The method for manufacturing a wound-type electronic component according to claim 8, wherein a groove deeper than the thickness of the winding is formed at a position corresponding to both side surfaces of the product core in the sheet. A method for manufacturing a wire-wound electronic component, characterized in that a through slit is provided. 15. The method for manufacturing a wound-type electronic component according to claim 8, wherein the width of the groove on the surface of the sheet is adjusted to be a width corresponding to the number of turns of the winding. A method of manufacturing a wire-wound electronic component, comprising: