CN103387388B - Ferrite Material, small-sized big current lamination sheet type wideband magnetic bead and its preparation method - Google Patents
Ferrite Material, small-sized big current lamination sheet type wideband magnetic bead and its preparation method Download PDFInfo
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Abstract
The invention discloses a kind of Ferrite Material, small-sized big current lamination sheet type wideband magnetic bead and its preparation method.Ferrite main material comprises the Fe of molar percentage
2o
349 ~ 55mol%, ZnO 25 ~ 35mol%, CuO 4 ~ 8mol%, NiO 8 ~ 15mol%, Co
3o
40.1 ~ 0.6mol%, Bi
2o
31 ~ 3mol%, Nb
2o
50.5 ~ 1.5mol%.Magnetic bead preparation method comprise ferrite slurry preparation, dry process material strip, cut, the ferrite tablet that punches, print the steps such as ferrite tablet, stacked ferrite tablet, excision forming.This Ferrite Material improves magnetic saturation and reduces direct current resistance, to reach resistance to more big current effect; Magnetic bead preparation method shortens the production cycle, thus enhances productivity, and magnetic bead volume is little, has good suppression electromagnetic interference capability more than 100MHz to 1GHz.
Description
Technical field
The invention belongs to inductive technologies field, particularly relate to a kind of Ferrite Material, small-sized big current lamination sheet type wideband magnetic bead and its preparation method.
Background technology
Magnetic bead is a kind of for suppressing the high frequency noise on signal wire, supply lead and spike disturb and absorb the electronic devices and components of electrostatic pulse.Along with the development of present digital circuit high speed, clock requency is more and more higher, requires the range of frequency of electromagnetic interference to expand to wide-band, until more than 1GHz.The pulse waveform of high-speed digital signal is more precipitous, so that fundamental frequency improves.Therefore require that the chip ferrite magnetic bead loading high-speed digital circuit must meet: keep low resistance in the frequency range of below 100MHz | Z|, so that the distortion not causing signal waveform; In the wide-band of 100MHz to 1GHz, there is high resistance | Z|, can effectively suppress broadband electromagnetical to disturb.
Present small-sized magnetic bead is little due to its volume, and adopt vertical structure to superpose from bottom to up, electrode coil is longer, makes direct current resistance (1.5 more than Ω) bigger than normal, and the maximum current of its ability is only 100mA or less, therefore cannot satisfy the demands.Or magnetic bead is in use excessive due to bias current, make ferrite close to saturated, magnetic permeability declines and causes suppressing the successful of high frequency noise to weaken.Existing domestic appearance is the resistance to electric current adopting the mode of parallel shunt to improve magnetic bead, but the mode of its parallel connection cannot reach high resistance | Z| value, what its manufacture craft adopted is wet-dry change technique, its manufacture craft is coarse by the way technique of printing pre-opened hole position, position, hole size accuracy is not all well controlled, therefore is only suitable for the larger product of specification.
At present, manufacture chip magnetic bead major part and adopt pure wet processing, wet method generally adopts the shaping diaphragm of curtain coating mode, and its operation is fixedly unfavorable for flexible operating, there is the production cycle long, the problem that production efficiency is low.
Summary of the invention
The object of the invention is to solve the shortcoming that little, the resistance to electric current of magnetic bead range of frequency made by existing Ferrite Material is low, a kind of Ferrite Material is provided.
Another object of the present invention is to the manufacture method that a kind of small-sized big current laminated type wideband magnetic bead is provided, overcome long, the inefficient shortcoming of production cycle when prior art manufactures laminated type wideband magnetic bead.
Another object of the present invention is to provide a kind of small-sized big current lamination sheet type wideband magnetic bead, overcomes the shortcoming that little, the resistance to electric current of magnetic bead range of frequency in prior art is low.
The technical scheme that the present invention solves the employing of its technical problem is:
A kind of Ferrite Material, wherein comprises main material molar percentage composition:
And a kind of manufacture method of small-sized big current lamination sheet type wideband magnetic bead, comprises the following steps:
Ferrite Material according to claim 1 is mixed with solvent, binding agent, softening agent ball milling, obtained ferrite slurry; The weight ratio of described Ferrite Material, solvent, binding agent, softening agent is (55 ~ 59): (34 ~ 38): (4 ~ 6): (1 ~ 3);
The scraper method of forming is adopted described ferrite slurry to be coated in PET release film surface, dry, obtain ferrite membrane material strip;
Described ferrite membrane material strip is cut into multi-disc ferrite tablet, ferrite tablet described in every sheet is offered fairlead and connecting hole, and make in adjacent two ferrite tablets, according to the stacked project organization order of the ferrite membrane sheet of magnetic bead, the fairlead on a ferrite tablet is corresponding with the connecting hole position of another ferrite tablet;
Ferrite tablet one printed conductor on the surface described in every sheet, print lead at fairlead place, described wire one end extends to lead and is connected with described lead conducting, and the other end extends to connecting hole;
According to the ferrite membrane sheet lamination order of magnetic bead, the ferrite tablet of described printed conductor is stacked gradually, and make in adjacent two ferrite tablets, lead on one ferrite tablet is fastened in the connecting hole of another ferrite tablet, realizes the wired in series conducting in adjacent two ferrite tablets;
According to dimensional requirement, the ferrite tablet after printing, lamination is cut.
Invention further provides a kind of small-sized big current lamination sheet type wideband magnetic bead, described small-sized big current lamination sheet type wideband magnetic bead is prepared by the manufacture method of above-mentioned small-sized big current lamination sheet type wideband magnetic bead.
Beneficial effect of the present invention is:
(1) Ferrite Material provided by the invention passes through Co
3o
4, Bi
2o
3and Nb
2o
5doping, effectively improve ferritic magnetic saturation and reduce direct current resistance, to reach resistance to more big current effect;
(2) dry process provided by the invention makes Stacked magnetic bead, prepare slurry, dry process material strip in procedure for preparation, cut, the operation such as material strip and printing of punching is independent process, the material got ready can place stock, can ignore when calculating the production cycle, and dry process need not toast and can directly cut, substantially reduce the production cycle, thus enhance productivity;
(3) small-sized big current Stacked magnetic bead provided by the present invention adopts vertical coil rhythmo structure, decreases stray capacitance, improves resonant frequency, makes this magnetic bead more than 100MHz to 1GHz, have good suppression electromagnetic interference capability.
Accompanying drawing explanation
Fig. 1 is the manufacture method schematic flow sheet of the small-sized big current Stacked magnetic bead of the embodiment of the present invention;
Fig. 2 is the perspective view of the small-sized big current Stacked magnetic bead of the embodiment of the present invention;
Fig. 3 is the explosive view of Fig. 2 middle-size and small-size big current Stacked magnetic bead structure.
In figure: the connecting hole of 1-lead-out tablet, 11-wire, 13-lead-out tablet, 2-lamination layer, 21,22,23,24-ferrite diaphragm, 211,221,231,241-wire, 212,222,232,242-lead, 213,223,233, the connecting hole of 243-ferrite diaphragm.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The equivalent electrical circuit of small-sized big current Stacked magnetic bead of the present invention is antiresonant circuit.Resonant frequency refers to the frequency when capacitance that inductance (magnetic bead) distributes and the resonance that inductance (magnetic bead) produces, and namely resonance condition occurs is: ω L-ω C [R when inductance and electric capacity are cancelled out each other
2+ (ω L
2)]=0, can resonant frequency be calculated thus:
Substitute into ω=2 π f, can obtain:
Thus formula can find out when impedance R and inductance L constant, electric capacity C and resonant frequency f inversely, can improve resonant frequency f by reducing electric capacity C.
Based on above-mentioned theory, the invention provides a kind of Ferrite Material that can improve magnetic saturation and improve resistance to large current characteristic.This Ferrite Material comprises following molar percentage composition:
Ferrite Material in above-described embodiment passes through at Fe
2o
3, adulterate in the main base material that forms of the component such as ZnO, CuO and NiO Co
3o
4, Bi
2o
3and Nb
2o
5deng doping component, and adjust Co
3o
4, Bi
2o
3and Nb
2o
5content, effectively improve the magnetic saturation of this Ferrite Material, reduce direct current resistance, there is resistance to more large current characteristic, be applied in magnetic bead hereafter, can make magnetic bead suppress high frequency noise successful strengthen.Through recording, the galvanic current resistance of this Ferrite Material is 1.0 below Ω, and resistance to electric current is up to 250 ~ 700mA.
Preferred Co
3o
4content is preferably 0.2 ~ 0.3mol%, Bi
2o
3content is preferably 1 ~ 2mol%, Nb
2o
5content is preferably 0.8 ~ 1.2mol%.Magnetic saturation and the Nai Geng large current characteristic that can make the further Ferrite Material of Ferrite Material energy of this preferred content, reduce galvanic current resistance.Through recording, the galvanic current resistance of the preferred embodiment Ferrite Material is 1.0 below Ω, and resistance to electric current is up to 250 ~ 700mA.
Present invention also offers a kind of manufacture method of with short production cycle, small-sized big current lamination sheet type wideband magnetic bead that effect is high, its manufacturing process as shown in Figure 1, please refer to Fig. 2 to Fig. 3 simultaneously.The manufacture method of this small-sized big current lamination sheet type wideband magnetic bead comprises the following steps:
S01. the preparation of ferrite slurry: the Ferrite Material of above-mentioned formula is mixed with solvent, binding agent, softening agent ball milling, obtained ferrite slurry; Wherein, the weight ratio of Ferrite Material, solvent, binding agent, softening agent is (55 ~ 59): (34 ~ 38): (4 ~ 6): (1 ~ 3);
S02. dry process material strip: the ferrite slurry adopting the scraper method of forming to be prepared by step S01 is coated in PET release film surface, dry, obtains ferrite membrane material strip;
S03. cut, punch ferrite tablet: the ferrite membrane material strip prepared by step S02 cuts into multi-disc ferrite tablet, ferrite tablet described in every sheet is offered fairlead and connecting hole, and make in adjacent two ferrite tablets, according to the stacked project organization order of the ferrite membrane sheet of magnetic bead, the fairlead on a ferrite tablet is corresponding with another ferritic connecting hole position;
S04. print ferrite tablet: ferrite tablet one printed conductor on the surface described in every sheet, print lead at fairlead place, described wire one end extends to lead and is connected with described lead conducting, and the other end extends to connecting hole;
S05. stacked ferrite tablet: according to the ferrite membrane sheet lamination order of magnetic bead, ferrite tablet through step S04 printed conductor is stacked gradually, and make in adjacent two ferrite tablets, lead on one ferrite tablet is fastened in the connecting hole of another ferrite tablet, realizes the wired in series conducting in adjacent two ferrite tablets;
S06. excision forming: according to dimensional requirement, by through step S05 printing, stacked after ferrite tablet cut.
Particularly, in above-mentioned steps S01, the formula of Ferrite Material and each component preferred content in filling a prescription as described above, in order to save length, do not repeat them here.Preferably, the weight ratio of this Ferrite Material, solvent, binding agent, softening agent is 57: 36: 5: 2.Wherein, solvent is preferably methylethylketone, ethanol binary azeotropic solvent, and binding agent is preferably polyvinyl butyral acetal (PVB), and softening agent is preferably dioctyl phthalate (DOP) (DOP).This softening agent and binding agent effectively can improve the intensity of Ferrite Material in PET release film surface adhesive, the cracking cutting or sinter after preventing Ferrite Material from printing the type that builds up.Wherein, contriver is found by research, suitable adjustment softening agent and the ratio of consumption of binder, except effectively effectively making to improve Ferrite Material except the intensity of PET release film surface adhesive, the deficiency that after can also effectively avoiding each magnetic bead precursor under the exclusion at cutters in the cutting process of hereafter step S06 again to bond together i.e. cutting, bonding die cannot disperse, the weight ratio of this softening agent and binding agent is preferably 0.4 ~ 0.5: 1.Preferred ratios both being somebody's turn to do effectively can overcome each magnetic bead precursor under the exclusion of cutters and again bond deficiency together.
In above-mentioned steps S02, the preparation of this ferrite membrane material strip can evenly scrape the surface in PET film with the ferrite slurry that above-mentioned steps S01 is prepared by the scraper method of forming on dry method pocket builder, and by be coated with ferrite slurry PET film under the pulling of spool by being provided with the oven for drying of temperature curve.Adopt the ferrite membrane material strip thickness of this dry process even, without cracking, free of pinholes, without lines, there is good toughness and intensity.The ferrite membrane material strip of this dry process can reach 3 ~ 5 months indoor sealing stock, can use flexibly at any time, compared with the technique of existing wet-layer preparation magnetic bead, saves the production cycle of front operation prepared by magnetic bead significantly.As preferred embodiment, this ferrite slurry is coated in PET film surface, after to be dried, ferrite slurry forms ferrite material layer on PET film surface, 10 ~ 100 μm are preferably to the thickness of this ferrite material layer of product of the present invention, be more preferably 20 ~ 30 μm, this preferred thickness can make coil electrode between layers there is less stray capacitance, obtains high resistance | Z| value.Study discovery through contriver, if Ferrite Material layer thickness is partially thin, the stray capacitance that coil electrode between layers exists is excessive, and impact reduces self-resonance frequence, does not reach the suppression electromagnetic interference effect of wideband; If Ferrite Material layer thickness is partially thick, reduces coil electrode mutual inductance between layers, higher impedance cannot be accomplished | Z| value.
In this step S02, the release film that release film can adopt this area conventional, as PET release film.In order to make ferrite membrane material strip flawless, this drying is preferably first through natural volatilization, then the oven dry of 60 ~ 90 DEG C; Wherein, the time of volatilization is changeable naturally, does not strictly limit, is preferably 6 minutes in the time of the oven dry of 60 ~ 90 DEG C.The ferrite membrane material strip obtained is for subsequent use.
In above-mentioned steps S03, cutting of ferrite membrane material strip is loaded into by the ferrite membrane material strip prepared in above-mentioned steps S02 clipper cuts into meet laminated forming size ferrite tablet, such as, by cut the size of this ferrite tablet of acquisition can be cut out 200mm × 160mm, but should be appreciated that, 200mm × 160mm is not unique size of ferrite tablet, can also according to actual production, the size of adjustment ferrite tablet flexibly.
In this step S03, drilling process is the lamination order according to the ferrite diaphragm between the lead-out tablet 1 shown in Fig. 1,2 and laminated sheet 2, that is to say the link position of each lamination of film figure according to design, the ferrite tablet by cutting acquisition offers fairlead and connecting hole.Wherein, in two adjacent ferrite tablets, according to the stacked project organization order of the ferrite membrane sheet of magnetic bead, the fairlead on a ferrite tablet is corresponding with another ferritic connecting hole position.As in Fig. 2, one connecting hole 13 of lead-out tablet 1 is corresponding with the fairlead of ferrite diaphragm 21, the connecting hole 213 of ferrite diaphragm 21 is corresponding with the fairlead of ferrite diaphragm 22, the connecting hole 223 of ferrite diaphragm 22 is corresponding with the fairlead of ferrite diaphragm 23, the connecting hole 233 of ferrite diaphragm 23 is corresponding with the fairlead of ferrite diaphragm 24, , , , wherein, ferrite diaphragm 21, ferrite diaphragm 22, ferrite diaphragm 23, the position of the fairlead of ferrite diaphragm 24 respectively with the position of the lead 212 of ferrite diaphragm 21, the position of the lead 222 of ferrite diaphragm 22, the position of the lead 232 of ferrite diaphragm 23, the location overlap of the lead 242 of ferrite diaphragm 24.According to this corresponding relation, on every ferrite tablet, fairlead and connecting hole are offered in corresponding position.
This fairlead and offering of connecting hole preferably adopt laser to offer, as first set up corresponding punching document in laser-beam drilling machine system, be put on punching platform by smooth for the ferrite tablet through cutting, high-octane laser is launched in the punching corresponding position of platform after laser-beam drilling machine performs punching document command, the fairlead place of ferrite tablet and connection hole are punched, forms fairlead and connecting hole respectively.Laser is adopted to offer connecting hole, with existing wet-dry change technique by compared with the way of printing pre-opened hole position, can by the pore size control of connecting hole to less, control below 100 μm, precision is higher, controls below 10 μm, thus magnetic bead specification prepared by the embodiment of the present invention is less, the volume of the magnetic bead prepared as the embodiment of the present invention can be contracted to 1005 specifications, that is to say 1.0 × 0.5 × 0.5mm.And existing wet-dry change technique is coarse by the way technique of printing pre-opened hole position, position, hole size and precision are not all well controlled, thus to cause and existing wet processing can only prepare the not high magnetic bead product compared with large gauge of accuracy requirement, and, the volume of existing big current wideband magnetic bead can only be 1608 specifications, that is to say 1.6 × 0.8 × 0.8mm.
In order to enhance productivity, more fairlead and connecting hole can be offered on a slice ferrite tablet.Like this after subsequent technique process, multiple magnetic bead precursor hereinafter described can be produced simultaneously.
In above-mentioned steps S04, printed conductor can adopt the full-automatic printer of this area to carry out brushing.The material of printed conductor and lead is silver slurry, and this silver slurry is the Argent grain of 0.2 ~ 0.8 μm and slabbing containing particle diameter.This particle diameter be 0.2 ~ 0.8 μm and the Argent grain of slabbing due to particle little, and due to Argent grain be sheet, increase the contact area between Argent grain, make the Contact of particle tightr, thus the wire of printing and lead conductivity are significantly improved, further reduction direct current resistance, improves the effect of its resistance to more big current.Other components of this silver slurry and content adopt this area to commonly use, not special requirement.
In above-mentioned steps S05, by stacked according to the lamination order of the ferrite diaphragm between the lead-out tablet 1 shown in Fig. 1,2 and laminated sheet 2 for the ferrite tablet after printing through above-mentioned steps S04.Before this step S05 is stacked, should be first separated by the release film in ferrite tablet, the structure after stacked as shown in Figure 2,3.Lead-out tablet 1, ferrite diaphragm 21, ferrite diaphragm 22, ferrite diaphragm 23 and ferrite diaphragm 24 stack gradually, wherein, the lead 212 of ferrite diaphragm 21 is fastened in a connecting hole 13 of lead-out tablet 1, and realizes being connected with wire 11 conducting on lead-out tablet 1 by this lead 212; The lead 222 of ferrite diaphragm 22 is fastened in ferrite diaphragm 21 connecting hole 213, and realizes being connected with wire 211 conducting on ferrite diaphragm 21 by this lead 222; The lead 232 of ferrite diaphragm 23 is fastened in ferrite diaphragm 22 connecting hole 223, and realizes being connected with wire 221 conducting on ferrite diaphragm 22 by this lead 232; The lead 242 of ferrite diaphragm 24 is fastened in ferrite diaphragm 23 connecting hole 233, and realizes being connected with wire 231 conducting on ferrite diaphragm 23 by this lead 242; According to this corresponding relation, the ferrite diaphragm after ferrite diaphragm 24 repeats ferrite diaphragm 21,22,23,24 annexation, does not repeat them here.
After this step S05 is stacked, the wire on each ferrite diaphragm just helically the series connection of type be integrated.
Preferably, in order to improve the production efficiency of magnetic bead, above-mentioned steps S04 and step S05 can adopt the chip-type laminated formation system of dry method to be formed as one, printing and laminating as printed folded formation system.This system is with accurate video contraposition, full-automatic printer, drying oven, automatic control program etc.By the ferrite tablet of the connecting hole punched by being laminated on support plate after video contraposition, print after having debugged printing screen plate and contraposition, laminated forming.
In above-mentioned steps S06, to above-mentioned steps through printing, stacked after the cutting of ferrite tablet be adopt vertical cutting, obtain the magnetic bead precursor meeting size.When offering more multi-link hole on every sheet ferrite tablet simultaneously, through printing, after stacked and cutting technique, multiple magnetic bead precursor can be obtained simultaneously.
Further, contriver finds under study for action, and when cutting vertical through step S06, cutting process is easily shifted and causes interior electrode to expose, and each magnetic bead precursor bonds together again under the exclusion of cutters, and namely after cutting, bonding die cannot disperse.Therefore, in order to avoid cutting process because of displacement cause in electrode expose deficiency, the lead-out tablet 1 being included in one end of magnetic bead precursor before the cutting in this step S06 is pasted at least one deck wheat paraffin paper on the surface and is assisted the step of excision forming.Because this wheat paraffin paper viscous force is strong, effectively prevent the displacement caused at cutting process, thus effectively prevent interior electrode and expose.Certainly, wheat paraffin paper can also adopt other material substitution of this area, as long as the effect that the other materials substituting wheat paraffin paper plays is identical with the wheat paraffin paper of the embodiment of the present invention, wheat paraffin paper all to possess skills enlightenment to other materials.Again the deficiency that after bonding together i.e. cutting as magnetic bead precursor each under the exclusion of cutters, bonding die cannot disperse, can be overcome by the ratio of softening agent and consumption of binder in adjustment above-mentioned steps S01, the weight ratio as softening agent and binding agent is preferably 0.4 ~ 0.45: 1.Preferred ratios both being somebody's turn to do effectively can overcome exclusion each magnetic bead precursor under the exclusion of cutters and again bond deficiency together.
Further, also comprise and carry out the operations such as binder removal sintering, chamfering, painting end electrode, silver ink firing, tempering, plating, sorting test and packaging to obtaining magnetic bead precursor after above-mentioned steps S01 to step S06 process, thus obtain the magnetic bead of the embodiment of the present invention.Wherein, the operation such as binder removal sintering, chamfering, painting end electrode, silver ink firing, tempering, plating, sorting test and packaging only need be carried out according to the method that this area is conventional.
From the above, the above-mentioned dry process that provides makes small-sized big current laminated sheet wideband magnetic bead magnetic bead, prepare slurry, dry process material strip in procedure for preparation, cut, the operation such as material strip and printing of punching is independent process, the material got ready can place stock, can ignore when calculating the production cycle, and dry process need not toast and can directly cut, and substantially reduces the production cycle, thus enhances productivity.Preferably, adopt laser boring can well the size of control punch and precision, thus make the magnetic bead volume prepared by above-mentioned dry process to narrow down to 1.0 × 05 × 05mm.The step of the wheat paraffin paper set up before being cut effectively prevents the displacement caused at cutting process, thus effectively prevent interior electrode and expose, and improves the qualification rate of product.
Thus, the embodiment of the present invention additionally provide a kind of containing above-mentioned Ferrite Material and the small-sized big current laminated sheet wideband magnetic bead magnetic bead adopting above-mentioned dry process to prepare, its structure as shown in Figure 2,3, this small-sized big current lamination sheet type wideband magnetic bead comprises the lamination layer 2 be formed by stacking by the ferrite diaphragm of at least two panels, also be laminated with lead-out tablet 1 respectively in lamination layer 2 both ends of the surface, this lead-out tablet 1 is provided with the wire 11 that can strengthen turn-on effect and the connecting hole 13 being opened in wire 11 end points.Wherein, ferrite diaphragm in lamination layer 2 offers fairlead and connecting hole, at ferrite diaphragm one on the surface and be printed with wire between this fairlead and connecting hole, lead is printed at fairlead place, this wire one end extends to lead and is connected with described lead conducting, and the other end extends to connecting hole.Wire in adjacent two ferrite tablets in lamination layer 2 realizes conducting by lead and connects, like this, the wire on each ferrite diaphragm in lamination layer 2 just helically the conducting of type be connected in one.In addition, the wire of the helically type in lamination layer 2 is fastened in the connecting hole 13 of lead-out tablet 1 by the lead of the ferrite diaphragm of lamination layer 2 end face, realizes connecting with the wire 11 of lead-out tablet 1 conducting.
Particularly, the wire 11 in the layered relationship of lead-out tablet 1 and lamination layer 2, lamination layer 2 in the layered relationship of ferrite diaphragm and lead-out tablet 1 is shown in Figure 3 with the wire annexation on ferrite diaphragm in lamination layer 2.Lead-out tablet 1, ferrite diaphragm 21, ferrite diaphragm 22, ferrite diaphragm 23 and ferrite diaphragm 24 stack gradually.Wherein, ferrite diaphragm 21, ferrite diaphragm 22, ferrite diaphragm 23 and ferrite diaphragm 24 and other ferrite diaphragms do not indicated together form lamination layer 2.In lamination layer 2, the lead 212 of ferrite diaphragm 21 is fastened in a connecting hole 13 of lead-out tablet 1, and realizes being connected with wire 11 conducting on lead-out tablet 1 by this lead 212; The lead 222 of ferrite diaphragm 22 is fastened in ferrite diaphragm 21 connecting hole 213, and realizes connecting with the wire 211 on ferrite diaphragm 21 conducting by this lead 222; The lead 232 of ferrite diaphragm 23 is fastened in ferrite diaphragm 22 connecting hole 223, and realizes connecting with the wire 221 on ferrite diaphragm 22 conducting by this lead 232; The lead 242 of ferrite diaphragm 24 is fastened in ferrite diaphragm 23 connecting hole 233, and realizes connecting with the wire 231 on ferrite diaphragm 23 conducting by this lead 242; According to this corresponding relation, the ferrite diaphragm after ferrite diaphragm 24 repeats ferrite diaphragm 21,22,23,24 annexation, does not repeat them here.Lamination layer 2 is so stacked by the ferrite diaphragm of each layer, make the wire in ferrite diaphragm being helically connected into of type be integrated.Lead-out tablet 1 offers 4 connecting holes 13, between 4 connecting holes 13, be printed with the wire 11 of the strengthened turn-on effect in X-type.The lead 212 of the ferrite diaphragm 21 stacked with lead-out tablet 1 is fastened in a connecting hole 13 of lead-out tablet 1, and realizes being connected with the conducting of wire 11.Like this, in lamination layer 2, helically the wire two ends of type are just drawn by the wire 11 of the lead-out tablet 1 being layered in lamination layer 2 both ends of the surface.
Like this, magnetic bead containing said structure is owing to adopting above-mentioned Ferrite Material as ferrite diaphragm, effectively improve the magnetic saturation of this ferrite diaphragm, wire adopts the printing of above-mentioned silver slurry to form, reduce its direct current resistance, have resistance to more large current characteristic, magnetic bead can be made thus to suppress the successful of high frequency noise to strengthen, and is 250 ~ 700mA through recording resistance to electric current.The hole that preferred ferrite diaphragm is offered preferably adopts laser boring, the size of good control punch and precision, thus makes the volume of embodiment magnetic bead own to narrow down to 1.0 × 05 × 05mm.Lamination layer 2 in magnetic bead adopts vertical coil rhythmo structure, decreases stray capacitance, improves resonant frequency, has good suppression electromagnetic interference more than 100MHz to 1GHz.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a manufacture method for small-sized big current lamination sheet type wideband magnetic bead, comprises the following steps:
Ferrite Material is mixed with solvent, binding agent, softening agent ball milling, obtained ferrite slurry; The weight ratio of described Ferrite Material, solvent, binding agent, softening agent is (55 ~ 59): (34 ~ 38): (4 ~ 6): (1 ~ 3);
Adopt the scraper method of forming that described ferrite slurry is coated in release film surface, dry, obtain ferrite membrane material strip;
Described ferrite membrane material strip is cut into multi-disc ferrite tablet, ferrite tablet described in every sheet is offered fairlead and connecting hole, and make in adjacent two ferrite tablets, according to the stacked project organization order of the ferrite membrane sheet of magnetic bead, the fairlead on a ferrite tablet is corresponding with the connecting hole position of another ferrite tablet;
Ferrite tablet one printed conductor on the surface described in every sheet, print lead at fairlead place, described wire one end extends to lead and is connected with described lead conducting, and the other end extends to connecting hole;
Release film in ferrite diaphragm is separated;
According to the ferrite membrane sheet lamination order of magnetic bead, the ferrite tablet of described printed conductor is stacked gradually, and make in adjacent two ferrite tablets, lead on one ferrite tablet is fastened in the connecting hole of another ferrite tablet, realizes the wired in series conducting in adjacent two ferrite tablets;
According to dimensional requirement, the ferrite tablet after printing, lamination is cut;
Wherein, the thickness of described ferrite membrane material strip is 20 ~ 30 μm;
Described Ferrite Material, wherein comprises main material molar percentage composition:
2. the manufacture method of small-sized big current lamination sheet type wideband magnetic bead according to claim 1, it is characterized in that: to through printing, stacked after ferrite tablet cut before, be also included in the ferrite web surface being in end face and paste the step that excision forming assisted by wheat paraffin paper.
3. the manufacture method of small-sized big current lamination sheet type wideband magnetic bead according to claim 1 and 2, is characterized in that: in the step of the described ferrite membrane material strip of preparation, and described drying is first through natural volatilization, then the oven dry of 60 ~ 90 DEG C.
4. according to the manufacture method of the arbitrary described small-sized big current lamination sheet type wideband magnetic bead of claim 1 to 2, it is characterized in that: offer on described ferrite tablet in the step of fairlead and connecting hole, described fairlead and connecting hole adopt laser to offer to form.
5. the manufacture method of small-sized big current lamination sheet type wideband magnetic bead according to claim 4, is characterized in that: the aperture of described fairlead and connecting hole is less than 100 μm.
6. according to the manufacture method of the arbitrary described small-sized big current lamination sheet type wideband magnetic bead of claim 1 to 2, it is characterized in that: in the step of printed conductor and lead, described wire and lead adopt the printing of silver slurry to form, described silver slurry is containing Argent grain, described Argent grain is sheet, and its particle diameter is 0.2 ~ 0.8 μm.
7. a small-sized big current lamination sheet type wideband magnetic bead, is characterized in that: described small-sized big current lamination sheet type wideband magnetic bead is prepared from by the arbitrary described small-sized big current lamination sheet type wideband magnetic bead manufacture method of claim 1 ~ 6.
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| CN106542815B (en) * | 2015-09-21 | 2020-09-25 | 平湖市子元电子科技有限公司 | Method for manufacturing ferrite glue-free area |
| CN106653275B (en) * | 2016-09-13 | 2019-02-01 | 深圳振华富电子有限公司 | Stacked magnetic bead and preparation method thereof |
| CN106486238A (en) * | 2016-09-13 | 2017-03-08 | 深圳振华富电子有限公司 | A kind of Stacked magnetic bead and preparation method thereof |
| CN109910163A (en) * | 2017-12-13 | 2019-06-21 | 昊佰电子科技（上海）有限公司 | A kind of ferrite bound edge part manufacture craft |
| CN111489890B (en) * | 2019-01-28 | 2022-03-01 | 深圳市麦捷微电子科技股份有限公司 | Manufacturing method of patch power inductor |
| CN111446076B (en) * | 2020-05-19 | 2021-10-15 | 惠州市宏业兴电子有限公司 | Method for producing laminated magnetic beads |
| CN113658789B (en) * | 2021-08-18 | 2024-03-29 | 广东风华邦科电子有限公司 | Preparation method for improving current resistance of sheet type multi-layer thick silver magnetic beads |
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| JP4432973B2 (en) * | 2004-12-20 | 2010-03-17 | 株式会社村田製作所 | Manufacturing method of multilayer ceramic electronic component |
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