CN1238870C - Surface installation coil part and making method thereof - Google Patents

Abstract

The present invention provided a surface mount coil component, and its manufacturing process, in which variations in the coil characteristics can be suppressed between products while reducing the size. The surface mount coil component comprises a drum core applied with a winding, and an outer core surrounding the drum core around its axis. The outer core is divided into a pair of core components arranged at a specified interval, i.e. a core gap, from the drum core. Since the drum core and the core components are bonded through an adhesive material produced by admixing an adhesive with substantially spherical particles having a uniform particle size, the core gap has a substantially constant interval along the circumferential direction of the flange part. The core gap is defined by the particle size of the substantially spherical particles.

Description

Surface installation coil part and manufacture method thereof

Technical field

The present invention relates on the circuit base plate of electronic equipments, carry out surface installation coil part and the manufacture method thereof that face is installed.

Background technology

Coil component is an essential electronic component in the power circuit of electronic equipments such as mobile phone, hard disk unit, subnotebook PC.Surface installation coil part wherein, because the advantage that can install with very low height on printed substrate, in today of various e-machine miniaturizations development, its necessity is improving constantly (referring to such as patent documentation 1).

Such surface installation coil part almost vertically is configured on the printed substrate that needs are installed, have the edge at two ends up and down, core body have the column cydariform that is wound with coil magnetic core, be configured in outside the ring-type around this drum-shaped magnetic core and adorn magnetic core and adorning the pair of terminal electrode part that disposes above the magnetic core in addition disconnected from each otherly.Coil two ends are connected on electric with the terminal electrode part by welding or welding.

[patent documentation 1]

The spy opens the 2001-332425 communique

But surface installation coil part always has following problem.Promptly adorn magnetic core outward for ring-type always, in each goods, the interval of adorning magnetic core and drum-shaped magnetic core outward is difficult to accomplish the value of hope, and coil characteristics (such as L characteristic or the overlapping characteristic of direct current) will produce the deviation of the scope of can not be ignored.And owing to surface installation coil part always constitutes outer dress magnetic core insertion drum-shaped magnetic core, the diameter of outer dress magnetic core has to design surplus capacity, has the surface installation coil part of surplus capacity if be the words that maximize, the interval of outer dress magnetic core and drum-shaped magnetic core is excessive, and inappropriate situation that deviation etc. appears in magnetic core is externally adorned in the installation that drum-shaped magnetic core probably can occur mutually.

Summary of the invention

In view of such problem, the purpose of this invention is to provide a kind of surface installation coil part and manufacture method thereof, this part also will be able to suppress the deviation of each coil characteristics of each goods except realizing miniaturization.

Surface installation coil part of the present invention is a kind of have drum-shaped magnetic core that is twining coil and the surface installation coil part that surrounds the outer dress magnetic core of this drum-shaped magnetic core around this, it is characterized in that, should be divided into a few part magnetic cores by outer dress magnetic core, the each several part magnetic core is configured between the drum-shaped magnetic core with having certain intervals.

In surface installation coil part of the present invention, because outer dress magnetic core is separated, the each several part magnetic core can be configured on the drum-shaped magnetic core independently, therefore can be at an easy rate drum-shaped magnetic core with adorn clearance control between the magnetic core outward in the interval of afore mentioned rules.In other words, owing to there is no need to set above-mentioned surplus capacity, the area of surface installation coil part self just reduces, and this gap of each part almost is certain, and the deviation of the coil characteristics of each part just can be suppressed.

In surface installation coil part of the present invention, the interval of afore mentioned rules is preferably formed by particle diameter unanimity particle slightly spherical in shape.In the case, can constitute the gap between each several part magnetic core and the drum-shaped magnetic core simple and easyly, make it in the interval of afore mentioned rules.

The particle that this is slightly spherical in shape, preferred most of mixing in the bonding agent of bonding drum-shaped magnetic core and the use of each several part magnetic core.In the case, in the gap between each several part magnetic core and drum-shaped magnetic core, can determine particle position slightly spherical in shape really and easily.

Surface installation coil part of the present invention is to have the drum-shaped magnetic core that twined coil and the surface installation coil part of the outer dress magnetic core that is provided with round this drum-shaped magnetic core, it is characterized in that, should be divided into the several sections magnetic core by outer dress magnetic core, this drum-shaped magnetic core has the bonding agent of the consistent particle slightly spherical in shape of most particle diameters to bond together with the each several part magnetic core by mixing, makes it to have the interval of regulation.

In surface installation coil part of the present invention, because outer dress magnetic core is cut apart, the each several part magnetic core can be configured on the drum-shaped magnetic core independently, can and adorn gap between the magnetic core outward by particle control drum-shaped magnetic core slightly spherical in shape.In other words, owing to there is no need to be provided with above-mentioned surplus capacity, the area of surface installation coil part self reduces, and owing to particle slightly spherical in shape contacts with outer dress magnetic core with drum-shaped magnetic core, this gap in each part roughly is certain, and this just can suppress the deviation of the coil characteristics of each part.

In surface installation coil part of the present invention, this particle slightly spherical in shape is preferably obtained by nonmagnetic substance.In the case, because particle itself slightly spherical in shape to not influence of coil characteristics, just can suppress the deviation of the coil characteristics of each part more.

In surface installation coil part of the present invention, this drum-shaped magnetic core has the core body of winding around and is installed in a pair of edge of these core body both sides, and the each several part magnetic core is relative with the outer peripheral face at edge, preferably has the inner peripheral surface with this edge outer peripheral face same curvature radius.In the case, can along the drum-shaped magnetic core circumferencial direction with drum-shaped magnetic core and outside the gap adorned between the magnetic core be set at certain intervals, this just can suppress the deviation of the coil characteristics of each part more.

In surface installation coil part of the present invention, between the each several part magnetic core, be preferably formed mutual asynthetic gap portion.In the case, adorn magnetic core and drum-shaped magnetic core outward and can dispose very approachingly, the area of surface installation coil part self just can further dwindle.

Have the pair of electrodes that is installed on the outer dress magnetic core, the end of coil is perhaps drawn by above-mentioned gap portion preferably at above-mentioned gap portion, is connected on the electrode.In the case, the end of coil, in the gap outside constituting between the part magnetic core of dress magnetic core, perhaps gap portion is drawn thus, is connected on the electrode.That is to say,, be installed in the problem that the outer size that makes coil component when adorning magnetic core uprises, can roughly realize the small-sized of coil thickness with regard to not producing coil because coil is around the upside to outer dress magnetic core.Have again, when coil is connected with electrode,, operation can be carried out at an easy rate because coil there is no need to adorn outside the shoulder place discounting of magnetic core.

The end of coil is not suitable by above-mentioned gap portion in the short transverse of drum-shaped magnetic core agley.

The short transverse of so-called drum-shaped magnetic core, be equivalent to winding around in drum-shaped magnetic core core body axially.Under situation about so constituting, if from the side, promptly come the sightingpiston installation coil part with the perpendicular direction of the short transverse of drum-shaped magnetic core, then the end of coil just becomes linearity.Therefore, extremely succinct at the wiring graph of coil component interior loop in structure so, carry out the operation of line easily.

The end of coil, be connected with electrode at gap portion, form gap portion for second by first of a part of magnetic core and the part magnetic core is adjacent therewith magnetic core, between first and second, it is suitable that mutual interval begins to direction extension far away by drum-shaped magnetic core.That is to say that preferred first and second face interval each other form wideer appearance by drum-shaped magnetic core at a distance.

If, then compare coil and electrode connecting line at gap portion, can make the coil component miniaturization with the situation that line is carried out in the outside of adorning magnetic core outside.Have again, as mentioned above, enlarge laterally, can guarantee the space of wiring operation, this operation can be carried out swimmingly by first and second center by drum-shaped magnetic core.And if above-mentioned first position relation with second is vertical generally, just can guarantee the space of wiring operation.

Have above-mentioned electrode to have again body part that is installed on the part magnetic core and the projection tab that is connected with this body part, this projection tab flexes into body part one side, and to narrow down be suitable to the end of coil between body part and projection tab.

Such projection tab is set, can be with projection tab terminal temporary fixed coil, the method that connects with welding or welding etc. strongly.For this reason, when surface installation coil part was installed on printed substrate, the heat by welding etc. made solder flux fusion at coil end, because coil suppressed by projection tab, so can prevent that coil from leaving electrode and producing the accident that breaks.

When adopting such structure, when the direction vertical with the drum-shaped magnetic core short transverse extended, it was suitable that the part magnetic core that the part magnetic core is adjacent does not therewith contact at the electrode protrusion sheet of installing on a part of magnetic core.

When coil by electrode body part and projection tab between the time, if the front end of projection tab and electrode body partly from the gap bigger, this operation is just carried out easily.Strengthen so maneuverable effect that the gap obtained, in the space that so-called clearance portion branch limits, constitute when connecting, more remarkable when constituting being connected of coil and electrode than the outer peripheral portion of adorning magnetic core outside.Therefore, under the situation that allows projection tab extend for the gap enlargement between the front end that makes projection tab and the electrode body part, do not contact with adjacent part magnetic core and when constituting, the existence of this part magnetic core can not hinder the operation of wiring, can very successfully carry out this operation.

When employing had the structure of above-mentioned projection tab, drum-shaped magnetic core had the core body of winding around and a pair of edge that is provided with at the two ends of this core body, is in the root on the electrode protrusion sheet, and on the drum-shaped magnetic core short transverse, what be positioned at the edge is suitable on every side.

As mentioned above, when the root of projection tab be not positioned at core body around and be positioned at the edge around the time, during by gap portion, the existence of projection tab does not constitute obstruction, can successfully carry out the operation of line at coil.

Have, when employing had the structure of above-mentioned projection tab, drum-shaped magnetic core had the core body of winding around and a pair of edge that is provided with at the two ends of this core body again, and it is suitable that the projection tab of electrode has the above length of a pair of marginating compartment.

If form projection tab with such length, how no matter the two ends of coil drawn and can both be pushed down by projection tab in the position of height from core body.And when using such as method winding arounds such as interior extrapolation methods, the one end is drawn by the downside of core body, and under the situation that the other end is drawn by the upside of core body, projection tab also can be pushed two ends.Therefore, the two ends of coil just there is no need to prepare electrode separately, also can realize reducing cost when enhancing productivity.

Above-mentioned electrode has button portion respectively at the upside and the downside of the short transverse of drum-shaped magnetic core, is installed on the part magnetic core by the button portion of upside and downside also to be fine.If constitute electrode in such a manner, just easily electrode is installed on the part magnetic core, and can prevents to come off unexpectedly.

In surface installation coil part of the present invention, drum-shaped magnetic core comprises the core body of winding around, be provided with in first marginal portion that a side of core body is provided with, at the opposite side of core body, the second bigger marginal portion of diameter than first edge, the layout of each several part magnetic core, preferably and the outer peripheral face of first marginal portion between have regulation the interval, the interval that in second marginal portion, has regulation between the face relative simultaneously with first marginal portion.This situation can reduce the leakage of the inboard magnetic flux of relative one side with first marginal portion in second marginal portion.

Manufacture method as surface installation coil part of the present invention, be a kind of the have drum-shaped magnetic core of winding around and outer dress magnetic core that around it, surrounds, and adorn the manufacture method that magnetic core is split into the surface installation coil part of a plurality of part magnetic cores outward, it is characterized in that this method is included in the inner peripheral surface of the outer peripheral face of drum-shaped magnetic core or a plurality of part magnetic cores or the bonding agent that forms at the particle slightly spherical in shape that both sides are coated with most diameter unanimities mixing, staggered relatively the inner peripheral surface of the outer peripheral face of drum-shaped magnetic core and a plurality of part magnetic cores then, make adhesive hardens and operations such as bonding drum-shaped magnetic core and a plurality of part magnetic cores.

In the manufacture method as surface installation coil part of the present invention, because outer dress magnetic core is cut apart, the each several part magnetic core can be configured on the drum-shaped magnetic core independently, can be controlled drum-shaped magnetic core and be adorned gap between the magnetic core outward by particle slightly spherical in shape.In other words, owing to there is no need to be provided with above-mentioned surplus capacity, the area of surface installation coil part self has just reduced, and owing to particle slightly spherical in shape all contacts with outer dress magnetic core with drum-shaped magnetic core, this gap is all roughly certain in each part, just can suppress the deviation of the coil characteristics of each part.

In manufacture method as surface installation coil part of the present invention, under the state that drum-shaped magnetic core and part magnetic core dispose in magnetic field, the outer peripheral face of preferred drum-shaped magnetic core and relative configuration of inner peripheral surface of part magnetic core.So, if dispose drum-shaped magnetic core and part magnetic core in magnetic field, both sides are with regard to attractive effect.Therefore, part magnetic core and drum-shaped magnetic core are connected, particle slightly spherical in shape positively contacts with the inner peripheral surface of part magnetic core and the outer peripheral face of drum-shaped magnetic core.

Preferably the inner peripheral surface of part magnetic core in magnetic field, be arranged in towards above state, preferably by on the inner peripheral surface of part magnetic core, placing drum-shaped magnetic core, make relative configuration of inner peripheral surface of the outer peripheral face and the part magnetic core of drum-shaped magnetic core.This situation makes the also generation effect of gravity beyond the above-mentioned attraction, and particle slightly spherical in shape just more positively contacts with the inner peripheral surface of part magnetic core and the outer peripheral face of drum-shaped magnetic core.

Description of drawings

Fig. 1 is the figure of expression as first execution mode of surface installation coil part of the present invention.

Fig. 2 (a) is the plane graph of the surface installation coil part of first execution mode; Fig. 2 (b) is the front elevation of the coil component shown in Fig. 2 (a); Fig. 2 (c) is the side view of the coil component shown in Fig. 2 (a).

Fig. 3 (a) is the state diagram that is illustrated in when winding around begins on the drum-shaped magnetic core; Fig. 3 (b) and Fig. 3 (c) are the figure of expression winding around end of a period state.

Fig. 4 is a manufacturing process of presentation surface installation coil part, the figure of drum-shaped magnetic core and part magnetic core adhering state.

Fig. 5 (a) and (b) be the figure of an example of expression drum-shaped magnetic core and part magnetic core adhering state.

Fig. 6 is that expression is connected on the operation after Fig. 4, by the projection tab of electrode the temporary fixed state diagram of coil.

Fig. 7 is that expression is connected on Fig. 6 operation afterwards, cuts off the state diagram of end winding.

Fig. 8 is that expression is connected on the operation after Fig. 7, carries out welding and finish the state diagram of wiring near the projection tab of electrode.

Fig. 9 is the figure of the overlapping characteristic of direct current of the above-mentioned surface installation coil part of expression.

Figure 10 is the stereogram of expression as second execution mode of the present invention.

Figure 11 (a) is the plane graph of the surface installation coil part of second execution mode, and Figure 11 (b) is the XIb-XIb sectional drawing of the coil component shown in expression Figure 11 (a).

Figure 12 (a) is the concept map that the explanation adhesives constitutes; Figure 12 (b) is the concept map of explanation drum-shaped magnetic core and part magnetic core adhering state.

Figure 13 (a) is the plane graph of the surface installation coil part of the 3rd execution mode; Figure 13 (b) is the XIIIb-XIIIb sectional drawing at the coil component shown in Figure 13 (a).

Figure 14 (a) is the plane graph of the surface installation coil part of the 4th execution mode; Figure 14 (b) is the XIVb-XIVb sectional drawing at the coil component of Figure 14 (a) shown in going up.

Figure 15 (a) is the plane graph of the surface installation coil part of the 5th execution mode; Figure 15 (b) is the XVb-XVb sectional drawing at the coil component shown in Figure 15 (a).

Figure 16 is the plane graph of the surface installation coil part of the 6th execution mode.

Figure 17 is the plane graph of the surface installation coil part of the 7th execution mode.

Figure 18 is the stereogram of the surface installation coil part of the 8th execution mode.

Figure 19 is the sectional drawing of the surface installation coil part of the 8th execution mode.

Figure 20 is the chart of explanation embodiments of the invention and conventional example structure.

Figure 21 is the comparison diagram of expression embodiments of the invention and conventional example characteristic.

Symbol description: 10 surface installation coil parts; 11 coils; The end of 11a, 11b coil; 12 drum-shaped magnetic cores; The 12a core body; 12b, 12c marginal portion; 14 outer dress magnetic cores; 15,16 part magnetic cores; 18 magnetic core gaps; 21,22 gap portions; 25,26 electrodes; The G particle; The M adhesives; The S bonding agent.

Embodiment

Describe suitable execution mode with reference to the accompanying drawings in detail as surface installation coil part of the present invention and manufacture method thereof.Same key element is used identical symbol, omits repeat specification.

(first execution mode)

Fig. 1 is the stereogram of the surface installation coil part 10 of present embodiment, and Fig. 2 (a)～Fig. 2 (c) is respectively plane graph, front elevation and the side view of same coil component 10.Surface installation coil part 10 carries out face by reflow soldering and installs on printed substrate etc., be applicable in the power circuit of electronic equipments such as mobile phone, hard disk unit, subnotebook PC that it is suitable using under such as the switching frequency of 250kHz～1MHz.

Surface installation coil part 10 mainly have the drum-shaped magnetic core 12 that twined coil 11 and this drum-shaped magnetic core 12 axially around the outer dress magnetic core 14 that is provided with.This drum-shaped magnetic core 12 and outer dress magnetic core 14 are undertaken bonding by the adhesives M that narrates below.In the present embodiment, coil 11 uses the coil of flat pattern (section is a rectangle).What coil 11 used is round conductor.

Outer dress magnetic core 14 is made of two identical part magnetic cores of shape (first's magnetic core 15 and second portion magnetic core 16), and each several part magnetic core 15 and 16 disposes by the magnetic core gap 18 between the drum-shaped magnetic core 12.Pair of electrodes 25 and 26 have been installed on each several part magnetic core 15 and 16, and two terminal 11a of coil 11 are connected with 26 with electrode 25 respectively with 11b.

In order to be more readily understood the present invention, in Fig. 2 (a), be illustrated in electrode 25 1 sides and carry out the operation of coil and electrode connecting line, electrode 26 expression be at the state that carries out before the line operation.

Drum-shaped magnetic core 12 is by making such as the Ni-Cu-Zn magnetic material, by being provided with the cylindric core body 12a that has twined coil 11 and a pair of discoideus edge 12b and the 12c that is provided with at the axial two ends of this core body 12a constitutes.The axle center of cylindric core body 12a is consistent with the axle center of discoideus edge 12b and 12c.

Coil 11 scribbles insulation polyurethane coverlay on copper cash, at its two front end in order to remove this polyurethane coverlay with electrode 25 and 26 conductings.In the present embodiment, coil 11 be with so-called interior extrapolation method be wrapped on the core body 12a (with reference in the back the narration Fig. 3 (a)～Fig. 3 (c)).

Outer dress magnetic core 14 and drum-shaped magnetic core 12 the same can manufacturings with the Ni-Cu-Zn magnetic material.Each several part magnetic core 15 and 16 cross section roughly are in the shape of the letter V, is certain in order to make magnetic core gap 18 on circumferencial direction, inner circumferential surface is to constitute with the form with the corresponding concave curved surface of outer peripheral face of drum-shaped magnetic core 12, and marginal portion 12b has the radius of curvature identical with outer peripheral face with 12c.

Drum-shaped magnetic core 12 and the gap of adorning outward between the magnetic core 14 are magnetic core gap 18, characteristic that can left and right sides coil.This magnetic core gap 18 is adhesivess that the particle G slightly spherical in shape by mixing diameter unanimity in bonding agent S forms, bonding by drum-shaped magnetic core 12 and each several part magnetic core 15,16 being carried out by this adhesives M, form roughly certain clearance (specified gap) along the circumferencial direction of marginal portion 12b and 12c.In other words, magnetic core gap 18 is by drum-shaped magnetic core 12 with adorn between the magnetic core 14 the particle diameter decision of the particle G that exists outward.

Particle G is so long as the insulator of being made by particle diameter nonmagnetic substance slightly spherical in shape unanimous on the whole gets final product the pearl that can use bead or synthetic resin to make.The particle diameter of particle G should suitably be selected according to surface installation coil part 10 desired coil characteristics (L characteristic, the overlapping characteristic of direct current etc.).The particle diameter of particle G can sieve commercially available bead, also can place the interstitial structure that constitutes by the high iron plate almost parallel ground of two depth of parallelisms and screen, and particle diameter is chosen near the certain value.

Bonding agent S preferably when solidifying volume shrink, such as the bonding agent that can use epoxy resin.If bonding agent S is accompanied by volumetric expansion when solidifying, probably can become magnetic core gap 18 greater than size by the particle diameter defined of particle G.

By Fig. 2 (b), Fig. 2 (c) as can be seen, part magnetic core 15 and 16 height are lower than drum-shaped magnetic core 12.In addition, in the plan view of each several part magnetic core 15 and 16, two fore-ends relatively be configured in drum-shaped magnetic core 12 around, between each fore-end, form gap portion 21 and 22 (scope of representing by broken broken line among Fig. 2 (a)).

Part magnetic core 15 and 16, being not only profile on plan view is that the outer dress magnetic core of rectangle separates along diagonal, but also divides they and an other quadrate part the relative fore-end of magnetic core to cut away or form the formation of chamfering sintering.Therefore, face (second face) SB1 of the face of part magnetic core 15 (first face) SA1 and part magnetic core 16 forms a gap portion 21, and face (second face) SB2 of the face of part magnetic core 15 (first face) SA2 and part magnetic core 16 forms gap portion 22.

More specifically say, in part magnetic core 15, form the face SA1 of gap portion 21 and in the part magnetic core 16 adjacent, form the interval that forms between the face SB1 of this gap portion 21, along with broadening away from the center of drum-shaped magnetic core 12 with part magnetic core 15.In gap portion 22 1 sides, the gap portion that is formed by face SA2 and face SB2 broadens towards the outside equally.

That is to say that each gap portion 21 and 22 forms wideer space along with extending laterally.In the present embodiment, above-mentioned SA1 and face SB1 are the relations of approximate vertical, and same face SA2 and face SB2 also are the relations of approximate vertical.At this, so-called approximate vertical is not necessarily 90 ° of two angles between the face, can think such as 80 °～100 °.

Electrode 25 and 26 has near body part 25a and the 26a the gap portion 21 that is installed in part magnetic core 15 and 16 and 22, and connects this body part and be arranged in fillet sheet (fairlead) 25b and the 26b of gap portion 21 and 22.Body part 25a has the rectangular core that contacts with the outside wall surface of part magnetic core with 26a, and the part that this core of aspect ratio is little is extended to the left and right directions of Fig. 2 (c).

Therefore, this is extended in the right side of same figure part, is close to face SA1 bending, and above-mentioned projection tab 25b and 26b sweep thus are outwards outstanding.Again just like in the figure of Fig. 2 (b) shown in the right side, electrode 25 and 26 bottom be warpage to the inside, and this bottom closes on the step part that forms on the bottom surface of part magnetic core.Therefore, electrode 25 and 26 is by being bonded on the part magnetic core such as various bonding agents such as liquid epoxiess.The bottom of such electrode just is installed in surface installation coil part 10 on the printed substrate by reflow soldering etc.

Electrode 25 and 26 is made by phosphor bronze, all electroplates except the part relative with the part magnetic core.Electroplating processes can plate prime coat by the Ni of 0.5 μ m earlier with electric plating method, plates the thick 100%Sn coating of 4 μ m again.

Carrying out to the stage before the coil 11 wiring operations, as shown in the chain-dotted line among Fig. 1, electrode 25 and 26 projection tab 25b and 26b go up extension in the direction (directions X) that slightly is normal with the face SA1 of part magnetic core 15.This state also can be by seeing among Fig. 2 (c).Therefore, when carrying out line, make the terminal 11a and the 11b of coil pass through gap portion 21 and 22 respectively, with methods such as riveted joint processing, projection tab 25b, 26b are bent to the body part 25a and 26a one side of electrode, between body part and projection tab, clamp the part that coil end 11a and 11b have removed coverlay.

It is interim fixing being clamped by projection tab, as shown in gap portion 21 1 sides of Fig. 2 (a), carry out arc welding or laser beam welding in the above, and method such as perhaps weld is finished wiring.Employing is carried out temporary fixed measure by such projection tab 25b and 26b, afterwards just can be easily and operation such as weld reliably.Have again, in the time of on surface installation coil part 10 being installed to printed substrate etc., even because of heat the welding portion or the solder flux fusion that the line position is applied of welding etc.,, just can avoid taking place and the broken string accidents of electrode 25 and 26 partitions because projection tab is pushed down coil.

The following describes the effect that obtains by surface installation coil part.As mentioned above, link to each other with 26 with electrode 25 respectively in the terminal 11a of coil and the 11b gap portion 21 and 22 between part magnetic core 15 and 16.In other words, because coil 11 is not bent to the upside of outer dress magnetic core 14, not only can not produce coil 11 and be cross over the problem that the size that makes coil component on the outer dress magnetic core 14 uprises, can also make the roughly thickness (bump that also comprises welding or welding) of coil 11 lower.When carrying out coil 11 and electrode 25,26 lines,, this processing ease is carried out owing to needn't fold to coil 11 the shoulder portion of outer dress magnetic core 14.

The face SA1 of part magnetic core 15 and the face SB1 of part magnetic core 16 are approximate vertical, because it broadens gradually towards the outside at interval, this gap part 21 just becomes enough spaces of carrying out the wiring operation.To gap portion 22 also is same.

In the present embodiment, when in gap portion 21,22, carrying out wiring, also can in gap portion 21,22, draw by coil end 11a and 11b wiring.In other words, the end of coil also can be connected with electrode by gap portion 21,22.If describe this form in detail, the coil of being drawn by gap portion is bent to the limit portion such as the face SA1 outside exactly, adorns outside in the scope of magnetic core 14 outer peripheral portions to be connected with electrode.

This situation, owing to coil 11 is not bent to outer necessity of adorning on magnetic core 14 shoulders, so can carry out the operation of wiring at an easy rate.Yet, when the outer peripheral portion of adorning magnetic core 14 outside carries out wiring, because the electrode protrusion sheet that wiring is required or the bump of welding all can make the size of coil component 10 strengthen, and from the viewpoint of miniaturization, preferably carry out the line of coil and electrode in gap portion 21,22.

Have again, in the present embodiment, as shown in Fig. 2 (b) and Fig. 2 (c), coil end 11a and 11b, by gap portion 21,22 o'clock not to short transverse (Z direction) bending of drum-shaped magnetic core 12.In other words, under the situation of sightingpiston installation coil part 10 from the side, the terminal 11a and the 11b of coil are linearly.Therefore, according to such structure, compare towards the situation of the line segment bending of outer dress magnetic core 14 with core body 12a by coil, very succinct at the wiring graph of coil component 10 interior loop, the wiring operation is also just carried out easily.

But as described in below, coil 11 usefulness interior extrapolation methods are wrapped in above the drum-shaped magnetic core 12, and its Width is and the short transverse of drum-shaped magnetic core 12 corresponding to (referring to Fig. 3 (c)).Therefore, because gap portion 21,22 also is to extend in the short transverse of drum-shaped magnetic core 12, coil 11 can not arrive gap portion with reversing, and from this viewpoint, we can say that wiring is operated carries out easily.

As shown in FIG. 1, the projection tab 25b that is installed in the electrode 25 on the part magnetic core 15 is when extending with the perpendicular direction (directions X) of the height of drum-shaped magnetic core 12, do not contact with adjacent part magnetic core 16.Therefore, part magnetic core 16 can not hinder projection tab 25b and extend to directions X, just can fully guarantee the interval between electrode body part 25a and the projection tab 25b fore-end, coil also just easily by between the body part 25a and projection tab 25b of electrode, carries out the wiring processing ease.

At this,, describe projection tab 25b, the 26b of electrode 25,26 in detail with reference to Fig. 2 (c).Shown on same figure, root 26c at electrode protrusion sheet 26b, that is to say boundary vicinity, on drum-shaped magnetic core short transverse (Z direction), be arranged in edge 12c position (part that figure edge 12c is blocked dots) on every side at body part 26a.

Therefore, the root 26c of projection tab is not around core body 12a and around the 12c of marginal portion, and when the terminal 11b of coil 11 passed through gap portion 22, the existence of projection tab 26b can not counteract, and the wiring operation can successfully be carried out.As shown in Fig. 2 (b), about projection tab 25b, its root is not equally on core body 12a, but on the location about of marginal portion 12c.

Projection tab 25b, 26b length X in the longitudinal direction is greater than the interval between marginal portion 12b and the marginal portion 12c.Therefore, no matter two terminal 11a, 11b of coil draw from any height of core body 12a, all can be pushed down by projection tab 25b, 26b.In the present embodiment, be that the coil in core body 12a is divided into two-layer with the interior extrapolation method winding around, as shown in Fig. 2 (b), a terminal 11a of coil is drawn by upside, and shown in Fig. 2 (c), the other end 11b of coil draws from downside.The coil of drawing like this, though the position of coil height under the different situation in both sides, the length X of aforesaid projection tab also can be pushed down two terminal 11a, 11b.

Therefore, just needn't prepare the electrode that each terminal 11a, 11b use respectively,, just can when enhancing productivity, also reduce cost owing to just can meet the demands with a kind of electrode.Can be common to another method of each end of coil as a kind of electrode of such usefulness, can enumerate in the both sides up and down of electrode projection tab is set, each projection tab length sum is greater than the method for length between marginal portion 12b, the 12c.

Particularly, above-mentioned surface installation coil part 10 has drum-shaped magnetic core 12 that is wound with coil and the outer dress magnetic core 14 that centers on this drum-shaped magnetic core 12 around it.At this, adorn magnetic core 14 outward and be split into a pair of part magnetic core 15,16, each several part magnetic core 15,16 be configured to and drum-shaped magnetic core 12 between the interval of regulation is arranged, promptly the magnetic core gap 18.

Because outer dress magnetic core 14 is split into a pair of part magnetic core 15,16, each several part magnetic core 15,16 can be independently near be configured in drum-shaped magnetic core 12 near, therefore just easily the gap between drum-shaped magnetic core 12 and the outer dress magnetic core 14 (being part magnetic core 15,16), promptly gap portion 18 is controlled in the interval of regulation.In other words, in order to insert drum-shaped magnetic core, surplus capacity is set needn't for the diameter of outer dress magnetic core, this just can reduce the area of plane of surface installation coil part 10 self.

Because particle G contacts with outer dress magnetic core 14 (being part magnetic core 15,16) with drum-shaped magnetic core 12, magnetic core gap 18 all is almost certain in each part, can suppress the deviation of the coil characteristics of each part.

In such surface installation coil part 10, magnetic core gap 18 is formed by the roughly spherical particle G of particle diameter unanimity.Thus, can realize making magnetic core gap 18 in the interval of regulation simple and easyly.

In such surface installation coil part 10, particle G is mostly mixing in the bonding agent S that drum-shaped magnetic core 12 and each several part magnetic core 15,16 are bonded together.Just can reliably and easily particle G be positioned in the magnetic core gap 18 thus.

In such surface installation coil part 10, be under the situation about making at particle G by nonmagnetic substance, because particle G itself does not influence coil characteristics, just more likely suppress the deviation of the coil characteristics of each part.

In such surface installation coil part 10, the inner peripheral surface of each several part magnetic core 15,16 has the identical radius of curvature of outer peripheral face with marginal portion 12b, the 12c of drum-shaped magnetic core 12.Thus, just can make magnetic core gap 18 become certain interval, also just can suppress the deviation of each part coil characteristics along the circumferencial direction of drum-shaped magnetic core 12.

In such surface installation coil part 10, between each several part magnetic core 15,16, form mutual asynthetic gap portion 21,22.Thus, adorn magnetic core 14 (part magnetic core 15,16) outward and can dispose very near drum-shaped magnetic core 12, this just might further reduce the area of plane of surface installation coil part 10 self.

Below with reference to Fig. 3～Fig. 8, the manufacture method of the surface installation coil part 10 of present embodiment is described.

Shown in Fig. 3 (a), at first on the core body 12a of drum-shaped magnetic core 12, use interior extrapolation method winding around 11.So-called interior extrapolation method is downside and the upside respectively reverse method of twining of a coil at drum-shaped magnetic core.On this figure, omitted the marginal portion 12b of upside.Fig. 3 (b) and Fig. 3 (c) expression coil 11 are finished the state of winding.

As shown in Fig. 3 (b), after finishing winding, remove two terminal 11a of coil 11, the insulating cover of 11b front end.As shown in Fig. 3 (c), with interior extrapolation method coil 11 is made two sections stacked shapes then, the Width of coil is the short transverse along drum-shaped magnetic core 12.So stacked numerical control is made as two-layerly, the height of coil component 10 just can reduce.

Then as shown in FIG. 4, bonding portion magnetic core 15,16 on drum-shaped magnetic core 12.Carrying out when bonding, at first, coating adhesives M on the inner peripheral surface of the part magnetic core 15 of installing electrodes, staggered relatively the inner peripheral surface of the outer peripheral face of drum-shaped magnetic core 12 and part magnetic core 15 then, drum-shaped magnetic core 12 and the part that has been coated with adhesives M are joined.Then, by hot pressing (150 ℃, about 5～10 seconds) bonding agent S is solidified temporarily.Then, make drum-shaped magnetic core 12 and part magnetic core 15 be in the free state that does not have pressure, heated about 30～60 minutes down, make bonding agent S carry out substance and solidify at 150 ℃.At this moment, also can part magnetic core 15 be placed on the magnet MG, then drum-shaped magnetic core 12 be placed on the part magnetic core 15 as at Fig. 5 (a) or (b).Thus, owing to the attraction B from magnet MG, drum-shaped magnetic core 12 just is adsorbed on the part magnetic core 15.In Fig. 5 (b), part magnetic core 15 is to be placed on the magnet MG with the state that inner peripheral surface makes progress, and places drum-shaped magnetic core 12 on the inner peripheral surface of part magnetic core 15.In Fig. 5, all omitted coil 11.

A part magnetic core 16 that then uses the same method again is bonded on the drum-shaped magnetic core 12.At this moment, coil end 11a, 11b are respectively by gap portion 21,22.

Also can be coated on adhesives M on the outer peripheral face of drum-shaped magnetic core 12 ( marginal portion 12b, 12c), also can be coated on the outer peripheral face of the inner peripheral surface of part magnetic core 15 and drum-shaped magnetic core 12.This adhesives M is coated with one deck adhesives M thinly on flat board, with silicon foams or silicon rubber its first-class method of inner peripheral surface of transferring to part magnetic core 15 is coated with again.

Then, as shown in FIG. 6, make terminal 11a, the 11b of coil body part 25a, 26a near electrode with wire molding machine, then that projection tab 25b, 26b riveted joint is temporary fixed coil.At this moment, because aforesaid gap portion 21,22 becomes enough spaces that wiring is used, therefore can successfully operate.Also can rivet projection tab 25b, 26b by state as shown in FIG. 4, the terminal 11a, the 11b that are pressed in the coil on the projection tab are directed to body part 25a, 26a one side naturally.If like this with projection tab 25b, 26b as guide plate, just can omit the operation of line moulding.

Then, as shown in FIG. 7, cut off the leading section that is clipped in the coil among projection tab 25b, the 26b with cropper.

As shown in FIG. 8, cover projection tab 25b, 26b by arc welding or laser beam welding or welding afterwards, so just finished the wiring operation of coil 11 and electrode 25,26.According to above method, finished the surface installation coil part 10 of present embodiment.

The manufacture method of above-mentioned surface installation coil part 10 comprises adhesives M is coated on the outer peripheral face of drum-shaped magnetic core 12 or the inner peripheral surface of part magnetic core 15,16, perhaps be coated on above the both sides, staggered relatively the inner peripheral surface of the outer peripheral face of drum-shaped magnetic core 12 and part magnetic core 15,16, bonding agent S is solidified, with operations such as drum-shaped magnetic core 12 and part magnetic core 15,16 are bonding.

Because outer dress magnetic core 14 is split into part magnetic core 15,16, each several part magnetic core 15,16 can be configured on the drum-shaped magnetic core 12 independently, and particle G can control magnetic core gap 18.In other words,, there is no need to be provided with surplus capacity, so just can reduce the area of plane of surface installation coil part 10 self for an outer dress magnetic core is inserted a drum-shaped magnetic core.

Because particle G contacts with outer dress magnetic core 14 (being part magnetic core 15,16) with drum-shaped magnetic core 12, the magnetic core gap 18 in each part is all about the same like this, just can suppress the deviation of the coil characteristics of each part.

In the manufacture method of this surface installation coil part 10, under the state of configuration drum-shaped magnetic core 12 and part magnetic core 15,16, the inner peripheral surface of the outer peripheral face of drum-shaped magnetic core 12 and part magnetic core 15,16 is staggered relatively in magnetic field.Therefore, if in magnetic field configuration drum-shaped magnetic core 12 and part magnetic core 15,16, between both sides with regard to attractive effect.Therefore, part magnetic core 15,16 and drum-shaped magnetic core 12 attract each other, particle G just reliably with the inner peripheral surface of part magnetic core 15,16 the outer peripheral face of drum-shaped magnetic core 12 contact.

In the manufacture method of this surface installation coil part 10, in magnetic field, dispose under the state of inner peripheral surface up of part magnetic core 15,16, on the inner peripheral surface of part magnetic core 15,16, place drum-shaped magnetic core 12, make that the inner peripheral surface of the outer peripheral face of drum-shaped magnetic core 12 and part magnetic core 15,16 is staggered relatively.This situation also has the effect of gravity except above-mentioned attraction, the inner peripheral surface of particle G and part magnetic core 15,16 and the outer peripheral face of drum-shaped magnetic core 12 are contacted more reliably.

Fig. 9 is the figure of the overlapping characteristic of direct current of the above-mentioned surface installation coil part 10 of expression.Transverse axis is represented electric current I dc (A), and the longitudinal axis is represented inductance L s (μ H).The size of outer dress magnetic core is that 3.6mm is square, height 1.8mm, inside diameter 1.9mm, the number of turns 14.5 circles of coil (lenticular wire).The bead diameter that uses in 1# is 0.05mm (50 μ m).

1#: use bead to form the magnetic core gap;

2#: do not use bead, the beeline in magnetic core gap is 10～20 μ m.

By above data, for using bead to form the part (1#) in magnetic core gap 18, the inductance at initial stage is always than higher, and still than higher, in the scope of 0～0.8A, the flatness of inductance is fine at the 0.8A place.

(second execution mode)

Below with reference to second execution mode of Figure 10 and Figure 11 explanation as surface installation coil part 30 of the present invention.Figure 10 is the stereogram of present embodiment coil component, and Figure 11 (a) is the plane graph of coil component, and Figure 11 (b) is the sectional drawing of Figure 11 (a) in the XIb-XIb direction.

Surface installation coil part 30 has the drum-shaped magnetic core 12 that is twining coil 11, the outer dress magnetic cores of forming with 12 a pair of part magnetic cores 35,36 that slightly are the U font that are connected across magnetic core gap 18 about the same of drum-shaped magnetic core therewith 34.Part magnetic core 35 and part magnetic core 36 do not engage mutually at relative position, middle surround drum-shaped magnetic core 12 by the side across gap 41,42.

Magnetic core gap 18 is the same with first execution mode, uses adhesives M, and its size is almost certain on the whole circumference direction.That is to say, between drum-shaped magnetic core 12 and part magnetic core 35,36,, formed the magnetic core gap 18 that is equivalent to particle G particle diameter as shown in Figure 12 (b).Figure 12 (a) is illustrated in the adhesives M that joins under the condition in container.

On part magnetic core 35, form 35a, 35b abreast, a pair of column cap shape electrode 45,46 is installed on the 35a of this foot, 35b towards the side-prominent cubical foot of part magnetic core 36 1 (teat relatively).Projection tab (guide plate) 45b, 46b on this column cap shape electrode 45,46 has the body part 45a, the 46a that are embedded in the part magnetic core 35 and is positioned at the gap portion 41,42 that body part therewith links to each other.

Body part 45a, the 46a of electrode has the tetragonal core that is positioned at the each several part magnetic core 35a of foot, the 35b outside and the down banded sheet warpage that becomes of quadrangle and the 45h of button portion, the 46h that form thereon.Column cap shape electrode 45,46 is by in the upside of the short transverse of drum-shaped magnetic core 12 and the 45h of button portion that downside forms, 46h clamping and be embedded on the 35a of foot, the 35b.

Use such column cap shape electrode 45,46, installing electrodes on the part magnetic core easily, and can prevent that it from coming off unexpectedly.In addition, the 45h of button portion, the 46h of downside are communicated with, seek to be communicated with printed substrate.In the surface installation coil part of first execution mode, also can be suitable for such column cap shape electrode.The quadrangle scope of the body part of this column cap shape electrode is configured in the inboard of part magnetic core, also can each button portion laterally warpage be installed on the 35a of foot, the 35b.

Projection tab 45b, 46b are the same with first execution mode, coil end 11a, 11b are clamped between the body part of electrode, play auxiliary fixation.Projection tab 45b constitutes the structure of the temporary fixed coil of below warpage in figure, and relative therewith, projection tab 46b constitutes the structure of the temporary fixed coil of warpage upward.

Figure 10 represents to push down state before the coil with projection tab, and Figure 11 represents that the bent tabs sheet makes the temporary fixed state of coil.Under the state of Figure 11 by carrying out arc welding or wiring has just been finished in welding.

Can access the effect same according to present embodiment with first execution mode.That is to say, except the area of plane that can reduce surface installation coil part 30 self, can also suppress the deviation of each part coil characteristics.

Terminal 11a, the 11b of coil, in the gap portion 41,42 between part magnetic core 45,46 respectively with column cap shape electrode 45,56 lines.In other words, because coil 11 need not be bent to the upside of outer dress magnetic core 34, can realize the low level of coil 11 thickness (bump that also comprises welding or welding) substantially.

When the wiring operation of carrying out coil 11 and column cap shape electrode 45,46, coil 11 needn't flex into the shoulder part of outer dress magnetic core 34, and this operation can be carried out at an easy rate.But, be consistent owing to use the Width of interior extrapolation method coil 11 and the short transverse of drum-shaped magnetic core 12, can make coil 11 not by gap portion with reversing, viewpoint is set out thus, and the wiring operation is easy to carry out.

(the 3rd execution mode)

Below with reference to three execution mode of Figure 13 explanation as surface installation coil part of the present invention.Figure 13 (a) is the plane graph of the surface installation coil part of present embodiment, and Figure 13 (b) is the sectional drawing of the XIIIb-XIIIb direction of Figure 13 (a).

In the surface installation coil part 50 of present embodiment, the part magnetic core 55,56 that constitutes outer dress magnetic core 54 is the U font of same shape.Therefore, the straight line place that connects into of the gap portion 61 that between part magnetic core 55,56, forms of the axis centre of drum-shaped magnetic core 12 and gap portion 62.

Pair of electrodes 65,66 is bonded in two foots of part magnetic core 55 by bonding agent.Electrode 65,66 is made up of projection tab 65b, the 66b that the body part 65a, the 66a that are connecting part magnetic core 55 link to each other with body part therewith.Therefore, same with second execution mode, terminal 11a, the 11b of coil is temporarily fixed in the gap portion 61,62 by projection tab 65b, 66b by gap portion 61,62.By the state of Figure 10, make it to cover near projection tab 65b, the 66b by arc welding or welding, just finished wiring.

Same with first execution mode, used adhesives M, so just can remain on almost certain scope to magnetic core gap 18 along the whole circumference direction.

In the present embodiment, except the area of plane that has reduced surface installation coil part 50 self, can also suppress the deviation of each part coil characteristics.

Owing to pass through gap portion 61,62 equally with the respective embodiments described above, seek coil thickness low level substantially.In addition, owing to carrying out the warpage operation on the shoulder part that need not adorn magnetic core outside, the wiring operation of coil and electrode is more prone to.Because part magnetic core 55,56 is of similar shape in the present embodiment, compares with second execution mode, only makes a kind of part magnetic core and gets final product, this becomes an advantage.

(the 4th execution mode)

Below with reference to four execution mode of Figure 14 explanation as surface installation coil part of the present invention.Figure 14 (a) is the plane graph of the surface installation coil part of present embodiment.Figure 14 (b) is the sectional drawing of the XIVb-XIVb direction of Figure 14 (a).

In the present embodiment, outer rim along outer dress magnetic core 54 on the plan view of hypothesis surface installation coil part is under the situation of a quadrangle (dotting in Figure 11 (a)), and the gap portion 61,62 between the part magnetic core 55,56 lays respectively near two relative summits.It is parallel to delineate out the tetragonal diagonal l1 that the plane of the gap portion 61,62 in the part magnetic core 55,56 supposes therewith.That is to say that gap portion 61,62 is having certain width on the radial direction of drum-shaped magnetic core 12.

Present embodiment is also same with first execution mode, by using adhesives M, just can make magnetic core gap 18 almost certain on circumferencial direction.

In the present embodiment, except the area of plane that can reduce surface installation coil part 70 self, also can suppress the deviation of the coil characteristics of each part.

The same with the respective embodiments described above, because coil is sought coil thickness low level substantially by gap portion 61,62.In addition, owing to need not flex into the enterprising line operate of shoulder part of outer dress magnetic core, the wiring of coil and electrode is carried out easily.But because gap portion 61,62 does not have the outwards structure of expansion, from the viewpoint of wiring processing ease, first execution mode is better than present embodiment.

(the 5th execution mode)

Below with reference to five execution mode of Figure 15 explanation as surface installation coil part of the present invention.Figure 15 (a) is the plane graph of the surface installation coil part of present embodiment.Figure 15 (b) is the sectional drawing of Figure 15 (a) on the XVb-XVb direction.

In the present embodiment, constitute any length in the each several part magnetic core 75,76 of outer dress magnetic core 74 towards the foot of another one magnetic core, about two sides (about in Figure 15 (a) being) be different.In part magnetic core 75, the 75r of foot is longer than another foot 751, and in part magnetic core 76, the 76r of foot is longer than another foot 761.But the shape of part magnetic core 75 and part magnetic core 76 is the same.

Have again, in two 75r of foot, 751 of part magnetic core 75, pair of electrodes 65,66 is installed.The structure and the 3rd execution mode of electrode 65,66 are same, have the body part 65a, the 66a that are connecting on the part magnetic core and the projection tab 65b, the 66b that are connected and are arranged in gap portion 61,62 therewith.

In the present embodiment, same with the respective embodiments described above, because coil is sought coil height low level substantially by gap portion 61,62.In addition, partly operate because need not flex into the shoulder of outer dress magnetic core, the wiring operation of coil and electrode is more prone to carry out.

The situation of present embodiment is identical with first execution mode, by using adhesives, just can make along the magnetic core gap 18 of circumferencial direction to keep almost certain.Therefore, except the area of plane that can reduce surface installation coil part 80 self, can also suppress the coil characteristics deviation of each part.

(the 6th execution mode)

Below with reference to six execution mode of Figure 16 explanation as surface installation coil part of the present invention.

In the surface installation coil part 90 of present embodiment, the outer dress magnetic core 84 that surrounds drum-shaped magnetic core 12 is made of part magnetic core 85 and part magnetic core 86.Thus between part magnetic core 85 and part magnetic core 86, only at a local gap portion 21 that forms.Have again, in this gap portion 21,, be connected to separately on the electrode 25,26 by two terminal 11a, 11b of coil.Can use as electrode and to have for example electrode of the such projection tab of first execution mode.

Under the situation of this spline structure, clamp coil with projection tab and carry out temporary fixedly,, the wiring operation concentrated on carry out in the gap portion 21 thereafter by arc welding or welding etc., therefore the manufacturing operation of surface installation coil part just can successfully be carried out, and has therefore also just improved productivity ratio.

In the present embodiment, at a local formation gap portion, but forming as first execution mode under the situation of a plurality of gap portions, a place makes two ends of coil by also passable therein.

The situation of present embodiment is identical with first execution mode, by using adhesives, just can make along the magnetic core gap 18 of circumferencial direction to keep almost certain.Therefore, except the area of plane that can reduce surface installation coil part 90 self, can also suppress the coil characteristics deviation of each part.

(the 7th execution mode)

Below with reference to seven execution mode of Figure 17 explanation as surface installation coil part of the present invention.

In the surface installation coil part 98 of present embodiment, the outer dress magnetic core 94 that surrounds drum-shaped magnetic core 12 is made of part magnetic core 95, part magnetic core 96 and part magnetic core 97 3 parts.If change observational technique, the part magnetic core 56 that is equivalent in the surface installation coil part shown in Figure 10 50 is divided into two.Since such adorning the structure that magnetic core is divided into three outward, three gap portions 91,92 and 93 between the each several part magnetic core, formed.If a plurality of gap portions are set, the overlapping characteristic of direct current is good, and it is little to that is to say that the inductance that changes with respect to electric current changes, and this is a favourable part.

And pair of electrodes 65,66 is installed in two foots of part magnetic core 95.Two terminal 11a, the 11b of coil is connected on each electrode 65,66 by gap portion 91,92.

So outer dress magnetic core being divided under three the situation, reach the effect same with above-mentioned execution mode.Have again,, adorn outward under the situation that magnetic core is made of the part magnetic core more than 4, can reach same effect though diagram is omitted.

The situation of present embodiment is identical with first execution mode, by using adhesives M, just can make along the magnetic core gap 18 of circumferencial direction to keep almost certain.Therefore, except the area of plane that can reduce surface installation coil part 98 self, can also suppress the coil characteristics deviation of each part.

(the 8th execution mode)

Below with reference to eight execution mode of Figure 18 and Figure 19 explanation as surface installation coil part of the present invention.

In the surface installation coil part 110 of present embodiment, the diameter of drum-shaped magnetic core 12 marginal portion 12b (second marginal portion) on one side is bigger than the diameter of other marginal portion 12c (first marginal portion) on one side.Each several part magnetic core 15,16 and the outer peripheral face of marginal portion 12c between total gap portion 18, in the 12b of marginal portion, between the face relative, dispose magnetic core gap 18 with marginal portion 12c.

The situation of present embodiment is identical with first execution mode, by using adhesives M, just can make along the magnetic core gap 18 of circumferencial direction to keep almost certain.Therefore, except the area of plane that can reduce surface installation coil part 110 self, can also suppress the coil characteristics deviation of each part.

The magnetic core gap 18 that between face relative on the 12b of marginal portion and part magnetic core 15,16, forms with marginal portion 12c, owing to be on the direction vertical, to extend to form, just can reduce magnetic flux from the inner side leakage of the face relative to marginal portion 12b that go up with marginal portion 12c with the axle of drum-shaped magnetic core 12.

The width in the magnetic core gap 18 of formation between the outer peripheral face of the width in the magnetic core gap 18 that forms between face relative on the 12b of marginal portion and the part magnetic core 15,16 and marginal portion 12c and part magnetic core 15,16 with marginal portion 12c, all can set, not necessarily adopt identical value according to the suitable ground of surface installation coil part 110 desired coil characteristics (L characteristic, the overlapping characteristic of direct current).

(with the comparison of conventional example)

In order to check action effect of the present invention, under condition shown in Figure 20, compare with conventional example.Design each surface installation coil part, making its length and width is 4mm, and thickness is 1.8mm, and inductance is about 10 μ H.

Surface installation coil part (being called this coil component below) as the embodiment of the invention adopts the 3rd execution mode (Figure 13).Coil uses the flat conductor of conductor size 0.1mm * 0.4mm, and its number of turns is 17.5ts.The D.C. resistance of this moment is 0.076 Ω.The magnetic core gap is 50 μ m.

First comparative example (below be called comparative example 1) is made of drum-shaped magnetic core and the outer dress of annular magnetic core, and they are contact structures not mutually.Coil uses the round conductor of conductor size φ 0.13mm, and its number of turns is 19.5ts.The D.C. resistance of this moment is 0.145 Ω.

Second comparative example (below be called comparative example 2) is made of drum-shaped magnetic core and the outer dress of annular magnetic core, the marginal portion of drum-shaped magnetic core with adorn magnetic core outward and engage.What coil used is the round conductor of conductor size φ 0.12mm, and its number of turns is 17.5ts.The D.C. resistance of this moment is 0.16 Ω.

Figure 21 represents the variation of inductance with respect to the overlapping characteristic of direct current.Thus figure as can be seen, this coil component coil number be less than comparative example 1 and with situation that comparative example 2 equates under, can guarantee same inductance, and the overlapping characteristic of direct current is also better than two comparative examples 1,2.

In this coil component, under the situation below the 50 μ m, can reach same inductance with the less number of turns in the magnetic core gap.In addition, under the situation more than the 50 μ m, when having same inductance, can improve the overlapping characteristic of direct current in the magnetic core gap.

Owing in this coil component, can use flat conductor, the low D.C. resistanceization of general realization.

Understand the present invention that the inventor proposes specifically based on execution mode above, but the present invention is not limited to the respective embodiments described above.Such as in the form shown in Figure 13 (b) (the 3rd execution mode), the foot of part magnetic core can form the shape of the taper that (drum-shaped magnetic core one side) highly narrows down towards the section inboard.At this moment, at the body part of electrode, sheet is mutually tortuous near installing up and down, even do not use the bonding agent also can be in the electrode embedded part magnetic core.

As mentioned above, by having realized miniaturization, can suppress the deviation of every goods coil characteristics simultaneously as surface installation coil part of the present invention and manufacture method thereof.

Claims (24)

1. surface installation coil part, this coil component have drum-shaped magnetic core that is twining coil and the outer dress magnetic core that surrounds this drum-shaped magnetic core around this, it is characterized in that,

Described outer dress magnetic core is split into a plurality of part magnetic cores,

Described each several part magnetic core be configured to and described drum-shaped magnetic core between have regulation the interval.

2. surface installation coil part as claimed in claim 1 is characterized in that, the interval of described regulation is formed by the particle slightly spherical in shape of particle diameter unanimity.

3. surface installation coil part as claimed in claim 2 is characterized in that, described particle slightly spherical in shape is most mixing in the bonding agent of bonding described drum-shaped magnetic core and described each several part magnetic core.

4. surface installation coil part as claimed in claim 2 is characterized in that, described particle slightly spherical in shape is made of nonmagnetic substance.

5. surface installation coil part as claimed in claim 1 is characterized in that, described drum-shaped magnetic core has core body that is twining described coil and a pair of marginal portion that is provided with in these core body both sides,

Described each several part magnetic core have with the outer peripheral face of described marginal portion relatively and the identical inner peripheral surface of outer peripheral face of radius of curvature and this marginal portion.

6. surface installation coil part as claimed in claim 1 is characterized in that, forms the gap portion that does not engage one another between the described each several part magnetic core.

7. surface installation coil part as claimed in claim 1 is characterized in that,

The diameter that described drum-shaped magnetic core comprises the core body that twining described coil, be provided with in first marginal portion that a side of described core body is provided with at the opposite side of described core body is greater than second marginal portion of described first marginal portion,

Described each several part magnetic core be configured to and the outer peripheral face of described first marginal portion between have described regulation the interval, and, at the interval that neutralizes and have regulation between the relative face in first marginal portion with described second marginal portion.

8. surface installation coil part, this coil component have drum-shaped magnetic core that is twining coil and the outer dress magnetic core that is provided with by the mode of surrounding this drum-shaped magnetic core, it is characterized in that,

Described outer dress magnetic core is split into a plurality of part magnetic cores,

The interval that described drum-shaped magnetic core and described each several part magnetic core have regulation,

Placement of adhesives between described drum-shaped magnetic core and described each several part magnetic core, described bonding agent are the mixing bonding agent of particle slightly spherical in shape with most particle diameter unanimities.

9. surface installation coil part as claimed in claim 8 is characterized in that, described particle slightly spherical in shape is made of nonmagnetic substance.

10. surface installation coil part as claimed in claim 8 is characterized in that, described drum-shaped magnetic core has core body that is twining described coil and a pair of marginal portion that is provided with in these core body both sides,

Described each several part magnetic core have with the outer peripheral face of described marginal portion relatively and the identical inner peripheral surface of outer peripheral face of radius of curvature and this marginal portion.

11. surface installation coil part as claimed in claim 8 is characterized in that, forms the gap portion that does not engage one another between the described each several part magnetic core.

12. surface installation coil part as claimed in claim 11, it is characterized in that this coil component has the pair of electrodes that is installed on the described outer dress magnetic core, the end of described coil is at described gap portion, perhaps draw, be connected on the described electrode by described gap portion.

13. surface installation coil part as claimed in claim 12 is characterized in that, the end of described coil does not pass through described gap portion bendingly to the short transverse of described drum-shaped magnetic core.

14. surface installation coil part as claimed in claim 12 is characterized in that, the end of described coil is connected on the described electrode at described gap portion, and,

Second by first of a described part magnetic core and the part magnetic core is adjacent therewith part magnetic core constitutes described gap portion,

Described first and described second mutual interval are along with broadening gradually away from described drum-shaped magnetic core.

15. surface installation coil part as claimed in claim 14 is characterized in that, described first and described second orthogonal.

16. surface installation coil part as claimed in claim 12 is characterized in that, described electrode has body part that is installed on the described part magnetic core and the projection tab that is connected setting with this body part,

By with described projection tab to described body part lateral buckling, the end of described coil is narrowed down between described body part and described projection tab.

17. surface installation coil part as claimed in claim 16, it is characterized in that, be installed in the described projection tab of a described electrode on the described part magnetic core, when on the direction vertical, extending, do not contact with the part magnetic core adjacent with this part magnetic core with the short transverse of described drum-shaped magnetic core.

18. surface installation coil part as claimed in claim 16 is characterized in that,

Described drum-shaped magnetic core has core body that is twining described coil and a pair of marginal portion that is provided with in the both sides of this core body,

The root of the described projection tab of described electrode, in the short transverse of described drum-shaped magnetic core, be positioned at described marginal portion around.

19. surface installation coil part as claimed in claim 16 is characterized in that,

Described drum-shaped magnetic core has core body that is twining described coil and the marginal portion that is provided with in the both sides of this core body,

The described projection tab of described electrode has the length greater than the interval of described a pair of marginal portion.

20. surface installation coil part as claimed in claim 12, it is characterized in that described electrode is on the short transverse of described drum-shaped magnetic core, side and downside respectively have a button portion thereon, are installed on the described part magnetic core by the button portion at described upside and downside.

21. surface installation coil part as claimed in claim 8 is characterized in that,

The diameter that described drum-shaped magnetic core comprises the core body that twining described coil, be provided with in first marginal portion that a side of described core body is provided with at the opposite side of described core body is greater than second marginal portion of described first marginal portion,

Described each several part magnetic core be configured to and the outer peripheral face of described first marginal portion between have described regulation the interval, and, at the interval that neutralizes and have regulation between the relative face in first marginal portion with described second marginal portion.

22. the manufacture method of a surface installation coil part, this method manufacturing have the drum-shaped magnetic core that is twining coil and are enclosed in axial outer dress magnetic core, and the described outer surface installation coil part that magnetic core is split into a plurality of part magnetic cores of adorning, it is characterized in that,

This method comprises the mixing bonding agent that the particle slightly spherical in shape of most particle diameter unanimities arranged is coated on the inner peripheral surface of the outer peripheral face of described drum-shaped magnetic core or described a plurality of part magnetic cores, perhaps be coated on their both sides, then relative configuration of inner peripheral surface of the outer peripheral face of described drum-shaped magnetic core and described a plurality of part magnetic cores, thereby make described bonding agent solidify the operation that described drum-shaped magnetic core and described a plurality of part magnetic core are bonded together.

23. the manufacture method of surface installation coil part as claimed in claim 22, it is characterized in that, described drum-shaped magnetic core and described part magnetic core are under the state that is placed in the magnetic field, relative configuration of inner peripheral surface of the outer peripheral face of described drum-shaped magnetic core and described part magnetic core.

24. the manufacture method of surface installation coil part as claimed in claim 23, it is characterized in that, be configured in the described magnetic field at following described part magnetic core of the state that described inner peripheral surface makes progress, by on the inner peripheral surface of described part magnetic core, placing described drum-shaped magnetic core, make that the inner peripheral surface of the outer peripheral face of described drum-shaped magnetic core and described part magnetic core is staggered relatively.

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