CN103730229A - Coil component - Google Patents
Coil component Download PDFInfo
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- CN103730229A CN103730229A CN201310389547.0A CN201310389547A CN103730229A CN 103730229 A CN103730229 A CN 103730229A CN 201310389547 A CN201310389547 A CN 201310389547A CN 103730229 A CN103730229 A CN 103730229A
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Abstract
The invention provides a coil component which can remove height difference of the terminal surface of a terminal metal piece caused by thickness difference of a bonding agent, and has the characteristics of good installation and wiring and high reliability. The coil component (1) possesses a coil (7) coiled by wires; a drum type core (2) supporting the coil (7); terminal metal pieces (6a-6f) connecting to the terminals of the coil (7); and a binding agent (11B) used for bonding the terminal metal pieces to the flange parts (4A,4B) of the drum type core (2). The drum type core (2) possesses the bottom surface (SB) of a flange part becoming an installation surface; each metal piece possesses a bottom surface part (TB) located on the surface of the flange part of the drum type core (2). The bottom surface (SB) of each flange part is provided with a jump formed by an upper segment surface (SB2) and a lower segment surface (SB1). The bottom surface part (TB) of the terminal metal piece is in direct contact with the upper segment surface (SB2); the gap (d1) between the bottom surface part (TB) of the terminal metal piece and the lower segment surface (SB1) is filled with the first binding agent (11B). Part of the binding agent (11B) is filled in the groove (SB3) formed on the lower segment surface (SB1) just below the jump.
Description
Technical field
The present invention relates to a kind of coil component, especially, relate to the terminal electrode structure of surface mounting type coil unit.
Background technology
Along with the miniaturization of electronic equipment in recent years, coil component is also required to carry out high-density installation.For example, in patent documentation 1, the coil component that can carry out the surface installing type of high-density installation is disclosed.
This coil component possesses: the core (core) with volume core and flange part; Be formed with the shell (case) of insulating properties of the spatial accommodation of core; In at least a portion, be exposed to the terminal metal piece that is mechanically fastened at shell under outside state; With terminal metal piece wiring and the coil (coiling) of reeling in the surrounding of volume core via shell.The spatial accommodation of core, comprise with the bottom surface of installed surface almost parallel by zoning, have respectively the lower surface of volume core and the lower surface of flange part relative with the bottom surface of volume core and flange part, the lower surface of volume core with respect to the lower surface of flange part at grade.On the relative position of the flange part with shell, stipulating has towards the outstanding foot of installed surface, disposes the installation portion of terminal metal piece in foot.Because terminal metal piece has the foliated fixed part that is embedded in shell, though therefore when mounted or during wiring terminal metal piece be subject to hot impact and also can suppress terminal metal piece and come off from insulating properties housing.
In above-mentioned coil component, for the installation of terminal metal piece, adopt the method that the fixed part of terminal metal piece is embedded to shell, but the general binding agent that uses more.But, use in the situation of binding agent, because deviation occurs for position or the amount of the binding agent between terminal metal piece and its installed surface, thereby can produce the problem of the height generation deviation of the terminal surface between a plurality of terminal metal piece.The deviation of the height of this terminal surface, becomes by the terminal part hot pressing of coil being connected to the deviation of the pressure while carrying out wiring on terminal surface, becomes the reason that causes that wiring is bad.In addition, also can produce the bad problem of installation of coil component.
In addition, in above-mentioned coil component, coiling is connected by the leading section hot pressing of coiling is connected in terminal metal piece and is realized with terminal metal piece.When coiling hot pressing is connected to terminal metal piece, the surperficial plated film of the wire rod of coiling (Cu) and terminal metal piece (Ni and Sn) reacts and forms alloy-layer.Herein, because the fusing point of alloy-layer is high, in the situation that on circuit substrate during hookup wire coil component this part become the composition surface of scolder, become the main cause that the wettability of scolder is declined.Especially, as shown in Figure 16 (a), if by the end of the terminal surface of the position alignment terminal metal piece 21 of the leading section 20e of the coiling by thermo-compressed 20, the end of the terminal surface from the bearing of trend of coiling is to end, in the wide region of terminal surface, form alloy-layer, thereby have alloy-layer, hinder the formation of fillet of solder and cause the worry that installation is bad.
In order addressing this problem, as shown in Figure 16 (b), the leading section 20e of coiling 20 not to be set in to the end of the terminal surface of terminal metal piece, but can be set near its inner side (central authorities).In this situation, be necessary to proceed as follows: the coiling 20 of drawing from the volume core of core, terminal surface by terminal metal piece 21 and lead to its place ahead after, should by hot pressing, be connected to terminal surface as the winding portion (solid line part) at rear of the position of the leading section of coiling, the winding portion in the place ahead (with reference to dotted line) is cut off and removes.But, if the winding portion in the place ahead contacts with the terminal surface of terminal metal piece 21, the heat during by thermo-compressed and while making the surperficial plated film melting of terminal metal piece, the surface of terminal metal piece is fixed in coiling, existence can not be cut off and the problem removed well.
Prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2009-117627 communique
Summary of the invention
In order to address the above problem, coil component of the present invention is characterised in that to possess: the coil that the coiling of reeling forms; Support the matrix of described coil; Be connected with at least one terminal metal piece of the terminal part of described coil; And the 1st binding agent that described terminal metal piece is bonded in to described matrix, described matrix has becomes the 1st of installed surface, described terminal metal piece has the 1st portion of terminal being positioned on described the 1st of described matrix, on described the 1st, be provided with the jump being formed by epimere face and hypomere face, described the 1st portion of terminal of described terminal metal piece is directly contacted with described epimere face, in described the 1st portion of terminal of described terminal metal piece and the gap between described hypomere face, is filled with described the 1st binding agent.
According to the present invention, can suppress the deviation by the height of the caused terminal surface of thickness of the binding agent between terminal metal piece and flange part, and can improve the flatness between a plurality of terminal metal piece.The unfavorable condition that the caused wiring of deviation of the pressure in the time of therefore, can eliminating the installation that the deviation by the installment state on printed base plate causes terminal part bad, by thermo-compressed coil and carry out wiring is bad etc.Further, according to the present invention, by described gap, can make terminal metal piece have elasticity, when cutting off the terminal part of coil, the buffering in the time of can being cut off by the elasticity of terminal metal piece, can cut off the terminal part of coil thus reliably.
Coil component of the present invention, preferably further possess be formed at described jump under the groove of described hypomere face, a part for described the 1st binding agent is filled in described groove.According to this structure, can prevent reliably the deviation of height of the caused terminal metal piece of deviation of the coated weight of binding agent.
In the present invention, the described terminal region of preferred described coil is in the top of described epimere face, and is wired to while overlooking and the 1st terminal surface of the described terminal metal piece that this epimere face is overlapping.According to this structure, can by terminal part reliably hot pressing be connected to the terminal surface of terminal metal piece, and can carry out reliably the cut-out of the coiling after thermo-compressed.Have, buffering during cut-out that can be using the described gap of accumulating space as the 1st binding agent as the terminal part of coil and being used, can apply flexibly the space of accumulating of binding agent effectively again.
Preferred described matrix has the 2nd with described the 1st quadrature, and described terminal metal piece is L font, further has the 2nd portion of terminal being positioned on described the 2nd, and described the 2nd portion of terminal is bondd and is fixed on described the 2nd by the 2nd binding agent.According to this structure, can be by the 1st binding agent and the 2nd binding agent fixed terminal metalwork reliably, and can carry out reliably the wiring undertaken by the thermo-compressed of the terminal part winding the line and cut-out thereafter.
Coil component of the present invention, preferably possesses a plurality of described terminal metal piece.The quantity of terminal metal piece is more, and its height tolerance more becomes large problem, according to this structure, can suppress the height tolerance between a plurality of terminal metal piece, and can prevent from installing bad bad with wiring.
In the present invention, preferred described matrix is the drum type core with the pair of flanges portion at the two ends that are wound with the volume core of described coil and are disposed at this volume core, described the 1st of described matrix is the bottom surface of described flange part, and described the 2nd of described matrix is the outer lateral side of described flange part.According to this structure, in the coil component of surface installing type that has used drum type core, can improve the wettability of the scolder of the terminal surface that wiring has coiling, and can improve and be electrically connected to and the reliability of mechanical connection.
In the present invention, described the 1st portion of terminal of preferred described terminal metal piece has the jump shape that the described jump with described matrix matches.In this situation, described the 1st portion of terminal of preferred described terminal metal piece is positioned on the extended line of described terminal part of described coil, has from described matrix and sees the 2nd terminal surface in the position lower than described the 1st terminal surface.According to this structure, owing to making when the thermo-compressed terminal part of coiling not be crimped on the surface of terminal metal piece, so can avoid the crimping of the terminal part of coiling, and can be reliably and the cut-out of easily carrying out the coiling after thermo-compressed remove.In addition, can make terminal metal piece along the jump face of matrix, and can suitably set the height in the gap between terminal metal piece and described hypomere face.In addition, owing to the area of the terminal surface of soldered installation can being guaranteed for wider, thereby can the terminal part of coil correctly not located during crimping, thus the terminal part of easily crimping coiling.
Coil component of the present invention, preferably further possesses the recess that is formed at described hypomere face, and described recess is arranged in described hypomere face and the nonoverlapping region of described terminal metal piece.According to this structure, by with lead frame integrated terminal metal piece bonding fixedly time, can suppress binding agent and flow to undesirable region along lead frame, and can prevent the situation that lead frame is bonded.
In the present invention, preferred described terminal metal piece is included at least the 1～3rd terminal metal piece being arranged in order in the direction of regulation, described the 1st terminal metal piece in the direction of described regulation and the insulation gap between described the 2nd terminal metal piece, wider than described the 2nd terminal metal piece in the direction of described regulation and the insulation gap between described the 3rd terminal metal piece, described recess is arranged at the region that is held in described the 2nd terminal metal piece and described the 3rd terminal metal piece in described hypomere face.Terminal metal piece is arranged in the situation of flange part of drum type core, the Width that the direction of regulation is flange part.According to this structure, binding agent flows out to the wide region between the 2nd terminal metal piece and the 3rd terminal metal piece, can prevent the situation that lead frame is bonded.
According to the present invention, can eliminate the deviation of the height of the terminal surface that the thickness deviation due to the binding agent existing between terminal metal piece and its installed surface causes.Therefore, can provide the bad and bad high coil component of reliability of wiring is not installed.In addition, according to the present invention, can cut off reliably and easily remove the not part of the coil after thermo-compressed.Therefore, can realize the coil component with the good terminal surface of the wettability of scolder.
Accompanying drawing explanation
Fig. 1 means the general perspective view of surface structure of the coil component of the 1st execution mode of the present invention.
Fig. 2 is the exploded perspective view of the coil component of Fig. 1.
Fig. 3 means the general perspective view that makes the state that the coil component of Fig. 1 spins upside down.
Fig. 4 is the equivalent circuit diagram of coil component 1.
Fig. 5 means the general perspective view of the structure of drum type core 2, and represents the state that terminal metal piece 6a～6f has been mounted.
Fig. 6 represents not have the bottom surface of drum type core 2 of state of terminal metal piece 6a～6f towards the rollover states of top.
Fig. 7 represents to be provided with the structure of the flange part of terminal metal piece, (a) for see the general plane figure of flange part from bottom surface side, (b) for see the general plane figure of flange part from outer lateral side side.
Fig. 8 (a) and (b) mean the general lateral sectional view of the shape of the terminal metal piece that is installed on respectively flange part 4A, 4B.
Fig. 9 (a)～(c) is for the ideograph of the thermo-compressed operation of the coiling of using fever tablet (heater chip) is described.
Figure 10 means the general perspective view of structure of the coil component 30 of the 2nd execution mode of the present invention.
Figure 11 means the general perspective view of shape of the drum type core of coil component 30.
Figure 12 is the equivalent circuit diagram of coil component 30.
Figure 13 means the figure of structure of the coil component 40 of the 3rd execution mode of the present invention, particularly represents the figure of the shape of drum type core 2.
Figure 14 means the general perspective view of the state from lead frame cuts off by the terminal metal piece that is installed on drum type core.
Figure 15 means the general lateral figure of the state of bonding terminal metal piece 6a～6c, (a) represents not have the existing structure of recess, and (b) expression has the structure of the present embodiment of recess.
Figure 16 (a) and (b) be for the ideograph of existing coil component is described.
Embodiment
Below, with reference to accompanying drawing, to of the present invention, be preferred embodiment described in detail.
Fig. 1 means the general perspective view of surface structure of the surface mounting type coil unit of the 1st execution mode of the present invention.In addition, Fig. 2 is the exploded perspective view of the coil component of Fig. 1, and Fig. 3 means the general perspective view that makes the state that the coil component of Fig. 1 spins upside down.
As shown in FIG. 1 to 3, this coil component 1 possesses: drum type core 2,5,6 terminal metal piece 6a～6f of slab core, be wound in the coil consisting of coiling 7 of drum type core 2.Although there is no particular limitation, the pulse transformer that coil component 1 is surface installing type, it is of a size of about 4.5mm * 3.2mm * 2.6～2.8mm, or is about 3.2mm * 3.2mm * 2.8～2.9mm.
The upper surface of slab core 5 is smooth even surface, so when the absorption of coil component 1 is installed, this upper surface can be installed as adsorption plane.Moreover, be also preferably even surface with the surface of the slab core 5 of the upper surface bonding of flange part 4A, 4B.By the level and smooth surface of slab core 5 is contacted with flange part 4A, 4B, thereby both close attachment reliably can be made, and the closed magnetic circuit that there is no magnetic leakage can be formed.
In terminal metal piece 6a～6f, 3 terminal metal piece 6a, 6b, 6c are arranged at flange part 4A mono-side, and other 3 terminal metal piece 6d, 6e, 6f are arranged at flange part 4B mono-side.Moreover in 3 terminal metal piece 6a, 6b, 6c, 2 terminal metal piece 6a, 6b are arranged at the close right side of flange part 4A, terminal metal piece 6c is arranged at the close left side of flange part 4A, is provided with certain insulation gap between the two.Therewith in the same manner, in 3 terminal metal piece 6d, 6e, 6f, 2 terminal metal piece 6d, 6e are arranged at the close right side of flange part 4B, and terminal metal piece 6f is arranged at the close left side of flange part 4B, is provided with certain insulation gap between the two.
As shown in Figure 2, the terminal metal piece 6a～6f of L font has respectively the bottom surface sections T contacting with the bottom surface (the 1st surface) of flange part 4A, 4B
b(the 1st portion of terminal), the side surface part T contacting with the outer lateral side (the 2nd surface) of flange part 4A, 4B
s(the 2nd portion of terminal).So as shown in Figure 3, the terminal part of coil 7 is connected to the bottom surface sections T of terminal metal piece 6a～6f by hot pressing
bsurface.
In addition, the coiling direction of coiling S1～S4 is different in layers 1 and 2.That is, for example, from flange part 4A, see the situation of the coiling direction from flange part 4A to flange part 4B, the coiling direction of coiling S1, S4 is clockwise direction, and with respect to this, the coiling direction of coiling S2, S3 is counterclockwise, contrary mutually.Arrange be like this due to, while starting to reel and reel that each coiling is distolateral not out of question to another from one end side stretching of volume core 3 yet while finishing.
The wiring of coiling S1～S4 and terminal metal piece 6a～6f is described.One end S1a, the other end S1b of coiling S1 are wired to respectively terminal metal piece 6a, 6f, and one end S2a, the other end S2b of coiling S2 are wired to respectively terminal metal piece 6f, 6b.In addition, one end S3a, the other end S3b of coiling S3 are wired to respectively terminal metal piece 6e, 6c, and one end S4a, the other end S4b of coiling S4 are wired to respectively terminal metal piece 6c, 6d.
In addition, terminal metal piece 6c, as shown in Figure 3, is set to leave a little terminal metal piece 6a, 6b.Also identical about terminal metal piece 6f, be set to leave a little terminal metal piece 6d, 6e.This is in order to ensure the proof voltage by between the primary coil that forms of coiling S1, S2 and the secondary coil consisting of wind the line S3, S4.
Fig. 4 is the equivalent circuit diagram of coil component 1.
As shown in Figure 4, terminal metal piece 6a and 6b are a pair of balance input terminals, i.e. side of the positive electrode terminal electrode IN+ and negative side terminal electrode IN-.In addition, terminal metal piece 6e and 6d are a pair of balance output end, i.e. side of the positive electrode terminal electrode OUT+ and negative side terminal electrode OUT-. Terminal metal piece 6c, 6f become respectively the centre cap CT of outlet side, input side.Coiling S1, S2 form the primary coil of pulse transformer, and coiling S3, S4 form the secondary coil of pulse transformer.
Fig. 5 means the general perspective view of the structure of drum type core 2, and represents the state that terminal metal piece 6a～6f has been mounted.In addition, Fig. 6 represents not have the bottom surface of drum type core 2 of state of terminal metal piece 6a～6f towards the rollover states of top.Moreover Fig. 7 (a) is for seeing the general plane figure of flange part 4A from bottom surface side, Fig. 7 (b) is for seeing the general plane figure of flange part 4A from outer lateral side side.
As shown in Figures 5 and 6, drum type core 2 consists of volume core 3, the 4A of pair of flanges portion, the 4B at two ends that be disposed at volume core 3.Drum type core 2 is rotational symmetric shape when overlooking, and flange part 4A, 4B are of similar shape.Therefore, in Fig. 7, only show flange part 4A, omitted the diagram of flange part 4B.
As shown in Figure 5, the upper surface S of flange part 4A, 4B
tfor level and smooth tabular surface, can improve thus the close attachment with slab core 5.As described above, the upper surface S of flange part 4A, 4B
tbetween set up slab core 5, form thus the closed magnetic circuit of essence.
As shown in Fig. 5, Fig. 6 and Fig. 7 (b), the outer lateral side S of flange part 4A, 4B
sbecome the high jump face in region low, in addition, setting area of terminal metal piece 6a～6f.Terminal metal piece 6a～6f is arranged at outer lateral side S
shypomere face S
s1, outer lateral side S
sepimere face S
s2the height mode that roughly becomes the same face with the upper surface with terminal metal piece 6a～6f form.In Fig. 7 (b), shadowed region is epimere face S
s2, shadeless region is hypomere face S
s1.
As shown in Fig. 6 and Fig. 7 (a), the bottom surface S of flange part 4A, 4B
bbecome the low jump face in region high, in addition, setting area of the base end part side of terminal metal piece 6a～6f.That is, on the setting area of terminal metal piece 6a～6f, be provided with epimere face S
b2with hypomere face S
b1.The major part of the non-setting area of terminal metal piece 6a～6f is hypomere face S
b1.So, the bottom surface sections T of terminal metal piece 6a～6f
bbase end part side be arranged at the bottom surface S of flange part 4A, 4B
bepimere face S
b2, the bottom surface sections T of terminal metal piece 6a～6f
bcorner portion side be arranged at the bottom surface S of flange part 4A, 4B
bhypomere face S
b1.In Fig. 7 (a), the region of enclosing shade is epimere face S
b2, shadeless region is hypomere face S
b1.
In present embodiment, the hypomere face S under jump
b1be provided with groove S
b3.Herein, so-called " jump under ", refers to and connects epimere face S
b2with hypomere face S
b1side wall surface extend downwards like this, as groove S
b3internal face and form continuously, and refer to that way does not exist hypomere face S therein
b1.Groove S
b3extend abreast with jump, its length equals the length of jump.Groove S
b3width there is no particular limitation, can be 0.1～0.2mm left and right.Groove S
b3cross sectional shape can be rectangular-shaped or U-shaped, can be also V word shape.Details is narrated below, by forming such groove S
b3thereby, the space between extended terminal metalwork and the bottom surface of flange part moderately, and can absorb the deviation of the bottom surface of flange part and the coated weight of the binding agent between terminal metal piece.
Fig. 8 (a) and (b) mean the general lateral sectional view of the shape of the terminal metal piece 6a～6f that is installed on respectively flange part 4A, 4B.(a) for to comprise all general lateral figure of drum type core, (b) be the part enlarged drawing of the terminal metal piece of flange part 4A side.In addition, the structure of flange part 4B side is identical with flange part 4A side.
As Fig. 8 (a) with (b), the bottom surface sections T of the terminal metal piece 6a～6f of L font
band side surface part T
s, respectively with the bottom surface S of flange part 4A, 4B
b(the 1st surface) and outer lateral side S
s(the 2nd surface) contacts.Herein, side surface part T
sby binding agent 11A, bond and be fixed on the outer lateral side S of flange part
s, bottom surface sections T
bby binding agent 11B, bond and be fixed on the bottom surface S of flange part
b.Also the fixation side that can only bond face T
s, according to this structure, can eliminate the bottom surface sections T of the caused terminal metal piece 6a～6f of deviation of the coated weight of binding agent
bheight tolerance.But, in present embodiment, owing to being provided with groove S
b3, thereby the deviation of the coated weight of absorbent binder agent to a certain extent.Therefore, can prevent the bottom surface sections T of the caused terminal metal piece 6a～6f of binding agent
bheight tolerance, can further improve its installation strength.
The bottom surface sections T of press terminal metalwork 6a～6f
bpower, with respect to binding agent 11, play the effect as shearing force, so bonding is fixing, easily peel off.With respect to this, the bottom surface sections T of press terminal metalwork
bpower towards the adhesive surface with binding agent 11B towards quadrature roughly, therefore can not be subject to such power and binding agent 11B is peeled off.Therefore, can prevent due to by thermo-compressed, undertaken wiring time or the cut-out time institute applied pressure of coiling situation that terminal metal piece is come off from flange part, and can improve the adhesion strength of terminal metal piece.
Joint has the bottom surface sections T of terminal metal piece 6a～6f of the terminal part of coil 7
bthere is jump shape.Moreover, the bottom surface S of flange part 4A, 4B
bjump face become the shape that the jump shape with this terminal metal piece 6a～6f matches.
The bottom surface sections T of terminal metal piece 6a～6f
bby the T of epimere portion that is arranged at the close inner side surface (near volume core 3) of flange part 4A, 4B
b1, be arranged at the close outer lateral side S of flange part 4A, 4B
sthe T of hypomere portion
b2form.Herein, the T of epimere portion
b1for the terminal surface contacting with the terminal part of coil 7 (epimere face S is provided
u) position (contact site), the T of hypomere portion
b2for the discontiguous terminal surface of terminal part (the hypomere face S with coil 7 is provided
l) position (noncontact portion).That is, the T of hypomere portion
b2with epimere face S
uin identical plane, do not there is terminal surface.
The bottom surface sections T of terminal metal piece 6a～6f
bepimere face S
uprovide while bearing thermo-compressed to " electrolysis " of the crimp force of the terminal part of coil 7.In addition, the bottom surface sections T of terminal metal piece 6a～6f
bhypomere face S
lprovide and make " the non-electrolysis " that to the crimp force of the terminal part of coil 7, discharge.By making the bottom surface sections T of terminal metal piece 6a～6f
bhave by epimere face S
uwith hypomere face S
lthe jump face forming, thus the terminal part that can avoid coil 7 in the bottom surface sections of terminal metal piece 6a～6f, spread all over this coil bearing of trend whole width by thermo-compressed.Therefore, the region not being formed with by the alloy-layer that produces with reacting of plated film of coiling can be guaranteed for wider, and can be reliably and the cut-out easily winding the line removal.
Preferably at the bottom surface sections T of terminal metal piece 6a～6f
bthe T of hypomere portion
b2the back side and the hypomere face S of flange part 4A, 4B
b1between the surface of side, be provided with gap d
1.Be provided with such gap d
1situation under, while cutting off the terminal part of coil 7 after thermo-compressed, can give the buffering being produced by the elastic force of terminal metal piece 6a～6f with respect to cutter (cutter).Therefore, can cut off reliably the terminal part of coil 7.
Be filled in gap d
1the buffering hardening of the terminal metal piece of binding agent 11B when coiling is cut off, but buffering can not disappear.Do not compare with there is no the situation of binding agent 11B, still can give suitable buffering.Moreover, due to such gap d
1existence, can be absorbed in the deviation of the coated weight of the binding agent that bonding used during terminal metal piece, can improve thus the flatness of the terminal surface between a plurality of terminal metal piece.
In Fig. 8 (b), by side surface part T
swith bottom surface sections T
bthe T of hypomere portion
b2(gap d
1part) 2 places bondings fixing, but the T of epimere portion
b1non-caked.Therefore, adhesion strength can be improved, and the epimere face S of the bottom surface of flange part can be guaranteed reliably
b2with the T of epimere portion
b1contact.Therefore, at the wiring position of the terminal part of coil, can prevent the bottom surface sections T of terminal metal piece 6a～6f
bheight tolerance.
Fig. 9 (a)～(c) is for the ideograph of thermo-compressed operation of the terminal part of coil 7 is described.
As shown in Fig. 9 (a), in thermo-compressed operation, terminal part distribution on corresponding terminal metal piece 6a～6f of coil 7 of the volume core 3 of drum type core 2 will be wound in.The terminal part of coil 7, leads to the outside of flange part 4A, 4B by terminal metal piece 6a～6f, extend substantially in parallel with the bottom surface of flange part 4A, 4B.
Secondly, as shown in Figure 9 (b), use fever tablet 12, the terminal part hot pressing of coil 7 is connected to the surface of terminal metal piece 6a～6f.Be positioned at the bottom surface sections T of terminal metal piece 6a～6f
bepimere face S
uthe winding portion of top be clamped into fever tablet 12 and epimere face S
ubetween, and pressed and be attached to terminal surface by the crimp force of the fever tablet 12 of high temperature, the wire rod of coiling (Cu) obtains sufficient engaging force with plated film (Ni and the Sn) alloying of terminal surface.
On the other hand, be positioned at the bottom surface sections T of terminal metal piece 6a～6f
bhypomere face S
lthe winding portion of top escape into fever tablet 12 and hypomere face S
lbetween gap d
2, be not endowed epimere face S
usuch sufficient crimp force.Therefore, can avoid this winding portion to the thermo-compressed of terminal surface.
As shown in Figure 9 (c), the terminal part of the coil 7 of thermo-compressed on terminal metal piece 6a～6f, is cut off device 13 and cuts off and make its length neat as mentioned above.Now, the off-position of coil 7 is near the jump of terminal metal piece 6a～6f.During the cut-out of the terminal part of coil 7, do not have the remaining line part 7r of the coiling of thermo-compressed not to be bonded to terminal surface, even or hypothesis due to melting when the thermo-compressed plated film be bonded to terminal surface, its pull-out capacity also a little less than, therefore, only by applying some power, just can peel off.Its result, coiling is only connected to the bottom surface sections T of terminal metal piece by hot pressing
bsurface in epimere face S
uthereby, become at hypomere face S
lthe state that there is no coiling.
At epimere face S
u, the surrounding of coiling is because alloying becomes the poor region of wettability of scolder, but also has at it region that there is no alloying around, and this region contributes to scolder to connect.On the other hand, at hypomere face S
lthere is not coiling, become the good region of wettability of scolder.Hypomere face S
lfor the side surface part T with terminal metal piece
sthe part of contact, and be that surface is when install and side surface part T
stogether to the helpful part of the formation of fillet of solder.Therefore, in the situation that such coil component 1 is installed on surface, can improve the wettability of the scolder of terminal metal piece 6a～6f, and can be reliably from the T of hypomere portion of terminal metal piece
b2to side surface part T
sform fillet of solder.Therefore, can improve the electrical connection of coil component 1 and the reliability of mechanical connection.
As described above, the coil component 1 of present embodiment, at the bottom surface S of flange part 4A, 4B that the drum type core 2 of terminal metal piece 6a～6f is installed
bon be provided with jump face, terminal metal piece and epimere face S
b2directly contact, in addition, at terminal metal piece and hypomere face S
b1between be provided with gap d
1, due to this gap d
1in be filled with binding agent 11B, so can suppress the height tolerance of the terminal surface between a plurality of terminal metal piece 6a～6f, and can guarantee the flatness of the terminal surface of each terminal metal piece 6a～6f.
In addition, in present embodiment, further possesses the hypomere face S under jump
b1the groove S forming
b3, because a part of binding agent 11B is filled in described groove S
b3in, thereby can suppress reliably the height tolerance of the terminal surface between a plurality of terminal metal piece 6a～6f.
In addition, the coil component 1 of present embodiment, owing to having the terminal surface of terminal metal piece 6a～6f of the terminal part of coil 7 at joint, being provided with the jump face contacting of avoiding with the leading section of coil 7, thereby can avoid leading section in coiling to be connected to terminal surface by hot pressing.The cut-out of therefore, can be reliably and easily carrying out the coiling after thermo-compressed is removed.
Moreover, in present embodiment, with the noncontact portion of terminal part of coiling be the electrode surface lower than contact site, thereby can widely guarantee the electrode surface of terminal metal piece.Therefore, the location of the terminal part of coil does not need high precision, the terminal part of easily thermo-compressed coiling.
Figure 10 means the general perspective view of structure of the coil component 30 of the 2nd execution mode of the present invention, and represents the state that spins upside down.In addition, Figure 11 means the general perspective view of shape of the drum type core of coil component 30.
As shown in Figure 10 and Figure 11, the coil component 30 of present embodiment is characterised in that, terminal metal piece 6c is divided into terminal metal piece 6c1,6c2 for 2 centre caps, in addition, terminal metal piece 6f is divided into terminal metal piece 6f1,6f2 for 2 centre caps, on each of the 4A of pair of flanges portion, 4B, 4 terminal metal piece is installed.At flange part 4A, be provided with terminal metal piece 6a, 6b, 6c1,6c2, at flange part 4B, be provided with terminal metal piece 6d, 6e, 6f1,6f2.
In present embodiment, the other end S3b of coiling S3 is connected in terminal metal piece 6c2, and one end S4a of coiling S4 is connected in terminal metal piece 6c1.In addition, one end S2a of coiling S2 is connected in terminal metal piece 6f2, and the other end S1b of coiling S1 is connected in terminal metal piece 6f1.Moreover, if via the wiring graph on printed base plate (pad), make terminal metal piece 6f1,6f2 short circuit and make terminal metal piece 6c1,6c2 short circuit, can realize identical with the coil component 1 shown in Fig. 1～Fig. 9 in fact function.
For centre cap, terminal metal piece 6c1,6c2,6f1,6f2 and terminal metal piece 6a, 6b, 6d, 6e similarly form.That is, the bottom surface S of terminal metal piece 6c1 for centre cap, 6c2,6f1,6f2 and corresponding flange part
bepimere face S
b2directly contact, in addition, terminal metal piece 6c1,6c2 and hypomere face S
b1between be provided with gap d
1(with reference to Fig. 8), this gap d
1in be filled with binding agent.Therefore, the height tolerance of the terminal surface between a plurality of terminal metal piece can be suppressed, the flatness of the terminal surface of each terminal metal piece can be guaranteed.In addition, the hypomere face S under jump
b2be formed with groove S
b3, a part for binding agent is filled in described groove S
b3in, thereby can suppress the height tolerance of the terminal surface between a plurality of terminal metal piece.
Figure 12 is the equivalent circuit diagram of coil component 30.
As shown in figure 12, terminal metal piece 6a and 6b are a pair of balance input terminals, and side of the positive electrode terminal electrode IN+ and the negative side terminal electrode IN-as primary side used.In addition, terminal metal piece 6e and 6d are a pair of balance output end, and side of the positive electrode terminal electrode OUT+ and the negative side terminal electrode OUT-as primary side used.Terminal metal piece 6c1,6c2 are used as centre cap CT2, the CT2 of outlet side, the short circuit mutually via pad LD1 during installation.Terminal metal piece 6f1,6f2 are used as the centre cap CT1 of input side, the short circuit mutually via pad LD2 during installation.Coiling S1, S2 form the primary coil of transformer, and coiling S3, S4 form the secondary coil of transformer.
As described above, the coil component 30 of present embodiment, via the pad LD1 on installation base plate, terminal metal piece 6c1,6c2 are connected to each other, via pad LD2, terminal metal piece 6f1,6f2 are connected to each other, can become thus the structure identical with the coil component 1 of the 1st execution mode.
Figure 13 means the figure of structure of the coil component 40 of the 3rd execution mode of the present invention, particularly represents the general perspective view of the shape of drum type core 2.
As shown in figure 13, the coil component 40 of present embodiment is characterised in that, at the bottom surface of flange part 4A, 4B S
bhypomere face S
b1be formed with respectively recess 41,41.Recess 41 plays terminal metal piece 6a～6f bonding to be fixed on to the bottom surface S of corresponding flange part
btime the binding agent mode that rests on the position of regulation stop the effect of its outflow.
The recess 41 of flange part 4A side is arranged at the region between the setting area of terminal metal piece 6a, 6b and the setting area of terminal metal piece 6c, and is arranged at hypomere face S
b1in with the nonoverlapping region of terminal metal piece 6a～6c.In addition, the recess 41 of flange part 4B side is arranged at the region between the setting area of terminal metal piece 6d, 6e and the setting area of terminal metal piece 6f, and is arranged at hypomere face S
b1in with the nonoverlapping region of terminal metal piece 6d～6f.The width of recess 41 is than the outer lateral side S of flange part 4A, 4B
sepimere face S
b2the slightly narrow degree of width, the two ends of the Width of recess 41 are close to the setting area of terminal metal piece 6a～6f.Recess 41 is set to connect the outer lateral side S to flange part 4A, 4B
s, but do not arrive inner side surface.In addition, recess 41 is in order to make the bond area of described below lead frame the least possible and be set up, so long as can reach this object, the degree of depth of recess 41, range (flat shape), position etc. just have no particular limits.
In addition, the central portion at the Width of flange part 4A, 4B, is formed with and compares the darker deep trouth 42 of the more narrow and deep degree of its width with recess 41.Although there is no particular limitation, this deep trouth 42 is used to when the manufacture of coil component fixedly drum type core 2.Deep trouth 42 connects to the mode of inner side surface and extends and arrange at the thickness direction of flange part with the outer lateral side from flange part 4A, 4B, and the formation region of crossing recess 41.In addition, in the present invention, and the nonessential deep trouth 42 that arranges, also can omit deep trouth 42.
Figure 14 means and terminal metal piece 6a～6f is installed on to the general perspective view of the state of drum type core 2 together with lead frame.
As shown in figure 14, terminal metal piece 6a～6f and lead frame 43 are integrated, and especially, terminal metal piece 6a is supported on the link sheet 43a of lead frame 43, and terminal metal piece 6b, 6c are supported on the link sheet 43b of lead frame 43.Similarly, terminal metal piece 6d is supported on the link sheet 43a of lead frame 43, and terminal metal piece 6e, 6f are supported on the link sheet 43b of lead frame 43.As illustrated, terminal metal piece 6a～6f with the integrated state of lead frame 43 under the bonded drum type core 2 that is fixed on, from lead frame 43, cut off afterwards.Moreover, terminal metal piece 6a～6c is arranged in order along the Width of flange part 4A, terminal metal piece 6a(on this Width the 1st terminal metal piece) and terminal metal piece 6b(the 2nd terminal metal piece) between insulation gap, than terminal metal piece 6b(the 2nd terminal metal piece) and terminal metal piece 6c(the 3rd terminal metal piece) between insulation gap wide.The structure of terminal metal piece 6d～6f is also identical.
Herein, terminal metal piece 6b and terminal metal piece 6c are connected to each other via linking sheet 43b, link the bottom surface S that sheet 43b is positioned at flange part 4A
bhypomere face S
b1top.In such structure, if be fixed on the bottom surface S of flange part 4A, 4B with bonding at the back side of terminal metal piece 6a～6f (or assigned position of the bottom surface of flange part) coating binding agent
b, there is the binding agent of mobility along linking sheet 43b and bottom surface S
bbetween small gap and at the lower surface that links sheet 43b, spread equably.But, as hereinafter described, in the situation that recess 41 is set, can stop the diffusion of such binding agent.
Figure 15 means the general lateral figure at the state of flange part 4A bonding terminal metal piece 6b, 6c, (a) represents not have the structure (the 1st execution mode) of recess 41, and (b) expression has the structure of the present embodiment of recess 41.In addition, also identical in the situation that of flange part 4B bonding terminal metal piece 6e, 6f, thereby the description thereof will be omitted.
As shown in Figure 15 (a) shows, in there is no the structure of recess 41, the hypomere face S of the back side in terminal metal piece 6b and flange part 4A
b1between binding agent along direction shown in arrow F1, flow out, in addition, the hypomere face S of the back side in terminal metal piece 6c and flange part 4A
b1between binding agent 11C along direction shown in arrow F2, flow out.As described above, at the bottom surface sections T of terminal metal piece 6a～6f
bthe T of hypomere portion
b2the back side and the hypomere face S of flange part 4A, 4B
b1between be provided with wittingly gap d
1situation under (with reference to Fig. 8 (b)), binding agent easily moves, and is made binding agent easily spread by capillarity.If binding agent 11C widely adheres at the back side that links sheet 43b, link sheet 43b bonded, even if cut off terminal metal piece, it is very difficult that the removal of lead frame 43 also can become.
On the other hand, as shown in Figure 15 (b), there is in the structure of present embodiment of recess 41 the hypomere face S of the back side in terminal metal piece 6b and flange part 4A
b1between binding agent 11C along direction shown in arrow F1, flow out, in addition, the hypomere face S of the back side in terminal metal piece 6c and flange part 4A
b1between binding agent along direction shown in arrow F2, flow out.But, in the situation that being provided with recess 41, in this position, gap expansion, thus capillarity dies down, and the outflow of binding agent 11C stops in the position of recess 41, so link the accompanying binding agent 11C in the back side of sheet 43b, is pettiness.That is, binding agent 11C does not flow into scope W2, and rests on scope W1.Therefore, can easily remove and cut off the lead frame 43(link sheet 43b after terminal metal piece).
As described above, the coil component 40 of present embodiment, due to the bottom surface S at flange part 4A, 4B
bhypomere face S
b1in be formed with recess 41 with the nonoverlapping region of terminal metal piece 6a～6f, thereby except the effect of the invention of the 1st execution mode, the outflow of the bonding that can also suppress terminal metal piece 6a～6f binding agent fixedly time, and can prevent that lead frame 43 is bonded in the situation of flange part 4A, 4B.In addition, present embodiment is the variation with the coil component 1 of 6 terminal metal piece 6a～6f, but also can be applied to the illustrated coil component with 8 terminal metal piece 30 of the 2nd execution mode.
The present invention is not limited to above execution mode, in the scope that does not depart from aim of the present invention, also can increase various distortion, and they are also contained in the present invention certainly.
For example, in above-mentioned execution mode, as the matrix that is wound with coil, use the drum type core of the horizontal type with the pair of flanges portion that is wound with the volume core of coil and is arranged at its two ends, but also can use the drum type core of so-called longitudinal type, can also use the core of other shape.In addition, there is no particular limitation for the installation number of terminal metal piece.
The explanation of symbol
Claims (10)
1. a coil component, is characterized in that,
Possess:
The coil that the coiling of reeling forms;
Support the matrix of described coil;
Be connected with at least one terminal metal piece of the terminal part of described coil; And
Described terminal metal piece is bonded in to the 1st binding agent of described matrix,
Described matrix has becomes the 1st of installed surface,
Described terminal metal piece has the 1st portion of terminal being positioned on described the 1st of described matrix,
On described the 1st, be provided with the jump being formed by epimere face and hypomere face,
Described the 1st portion of terminal of described terminal metal piece is directly contacted with described epimere face,
In described the 1st portion of terminal of described terminal metal piece and the gap between described hypomere face, be filled with described the 1st binding agent.
2. coil component as claimed in claim 1, is characterized in that,
Further possess be formed at described jump under the groove of described hypomere face,
A part for described the 1st binding agent is filled in described groove.
3. coil component as claimed in claim 1, is characterized in that,
The described terminal region of described coil is in the top of described epimere face, and is wired to while overlooking and the 1st terminal surface of the described terminal metal piece that this epimere face is overlapping.
4. coil component as claimed in claim 1, is characterized in that,
Described matrix has the 2nd with described the 1st quadrature,
Described terminal metal piece is L font, further has the 2nd portion of terminal being positioned on described the 2nd,
Described the 2nd portion of terminal is bondd and is fixed on described the 2nd by the 2nd binding agent.
5. coil component as claimed in claim 4, is characterized in that,
Described matrix is the drum type core with the pair of flanges portion at the two ends that are wound with the volume core of described coil and are disposed at this volume core,
Described the 1st of described matrix is the bottom surface of described flange part,
Described the 2nd of described matrix is the outer lateral side of described flange part.
6. coil component as claimed in claim 1, is characterized in that,
Possess a plurality of described terminal metal piece.
7. coil component as claimed in claim 1, is characterized in that,
Described the 1st portion of terminal of described terminal metal piece has the jump shape that the described jump with described matrix matches.
8. coil component as claimed in claim 7, is characterized in that,
Described the 1st portion of terminal of described terminal metal piece is positioned on the extended line of described terminal part of described coil, has from described matrix and sees the 2nd terminal surface in the position lower than described the 1st terminal surface.
9. the coil component as described in any one in claim 1～8, is characterized in that,
Further possess the recess that is formed at described hypomere face,
Described recess is arranged in described hypomere face and the nonoverlapping region of described terminal metal piece.
10. coil component as claimed in claim 9, is characterized in that,
Described terminal metal piece is included at least the 1～3rd terminal metal piece being arranged in order in the direction of regulation,
Described the 1st terminal metal piece in the direction of described regulation and the insulation gap between described the 2nd terminal metal piece, wider than described the 2nd terminal metal piece in the direction of described regulation and the insulation gap between described the 3rd terminal metal piece,
Described recess is arranged at the region that is held in described the 2nd terminal metal piece and described the 3rd terminal metal piece in described hypomere face.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-229267 | 2012-10-16 | ||
| JP2012229267 | 2012-10-16 | ||
| JP2013-112975 | 2013-05-29 | ||
| JP2013112975A JP5811139B2 (en) | 2012-10-16 | 2013-05-29 | Coil parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103730229A true CN103730229A (en) | 2014-04-16 |
| CN103730229B CN103730229B (en) | 2016-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310389547.0A Active CN103730229B (en) | 2012-10-16 | 2013-08-30 | Coil component |
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