CN101262085A - Molded ferrite sheet, sintered ferrite substrate and antenna module - Google Patents
Molded ferrite sheet, sintered ferrite substrate and antenna module Download PDFInfo
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- CN101262085A CN101262085A CNA2008100963121A CN200810096312A CN101262085A CN 101262085 A CN101262085 A CN 101262085A CN A2008100963121 A CNA2008100963121 A CN A2008100963121A CN 200810096312 A CN200810096312 A CN 200810096312A CN 101262085 A CN101262085 A CN 101262085A
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Images
Abstract
The present invention provides a molded ferrite sheet, sintered ferrite substrate and antenna module. The molded ferrite sheet having opposing surfaces and a thickness in a range of 30 mum to 430 mum, at least one surface of said opposing surfaces having the following surface roughness characteristics in that a center line average roughness is in a range of 170 nm to 800 nm, a maximum height is in a range of 3 mum to 10 mum, and an area occupancy rate of cross-sectional area taken along a horizontal plane at a depth of 50% of the maximum height in a square of side 100 mum is in a range of 10 to 80%.
Description
Technical field
The present invention relates to be used for the molded ferrite sheet, the soft-magnetic sintered ferrite substrate and the Anneta module of thin plate individual layer of manufacturing of the soft-magnetic sintered ferrite substrate of thin plate individual layer, this Anneta module is using RFID (radio frequency identification: use in the contactless IC tag of technology etc. Radio Frequency Identification).
Background technology
In order to obtain sintered ferrite substrate, fire ferrite powder the shaping sheet material, ferrite powder is blended in shaping sheet material in the resin.At this moment, shaping sheet material set each other (set), sintered ferrite substrate anchor at and fire with on the pedestal.When peeling off the sintered ferrite substrate of set, sintered ferrite substrate produces damaged, therefore, in order to prevent set, general adopt following method: the molded ferrite sheet before firing, fire and apply demoulding powder such as Zirconium oxide powder, alumina powder on the surface with base, and fire, after firing, remove demoulding powder.This operation is very loaded down with trivial details, and is difficult to remove fully demoulding powder, and therefore when being used in precise electronic parts etc., existence becomes the situation of the foreign substance pollution of equipment.
For example, Japanese kokai publication hei 2-305416 communique is the technology of " relate to the ferrite core distortion of using and prevent to use the ferrite sheet material when firing ferrite forming body ", record in the prior art: " this ferrite shrinks when firing; the distortion when preventing this contraction, and the use alumina powder is as coating powder on setter ".It is poor to use the ferrite core distortion to prevent with the method productivity of ferrite sheet material, needs to prepare in addition ferrite sheet material itself, can not use from cost consideration.The method of using coating powder produces to hang when firing and bumps under the situation of coating powder cohesion etc., or under the thin situation of molded ferrite sheet, the sintered ferrite substrate undulation, the frequency of breaking increases.
In addition, in TOHKEMY 2006-174223 communique, on flat substrates, lay the solid sheet (Gu sheet) of square ferrite of length of side 2mm, and be adhesively fixed, and then on top overlapping other flat substrates, antenna pattern, obtain antenna-integrated sheet magnetic material.But it is very difficult evenly and efficiently to arrange the solid sheet of ferrite on flat substrates, and impracticable.
In the prior art, when the Anneta module of use was worked near metal in the contactless IC tag that uses the RFID technology etc., magnetic flux was transformed to vortex flow in metal, can not communicate.As its countermeasure, extensively employing planar makes the conduction annulus form helical form, and with this coil method of laminated soft magnetic sheet material concurrently, in addition, in recent years, the requirement of the high-density installation of the miniaturization of electronic equipment such as portable phone, electronic unit improves day by day.Even strong request also can be carried out stable communication near being installed in metal, and the thinner Anneta module of the thickness of the laminated body of Anneta module.
As Anneta module, in No. 3728320 communique of Japan Patent, disclose the invention that constitutes by annulus and sheet magnetic material laminated body.In said structure, capacitor is inserted in parallel connection before equipment is installed, and is adjusted into the frequency of hope such as 13.56MHz.But, when being installed on electronic equipment and near metal, work, the situation that exists the resonance frequency of antenna to change, problem is a lot of in practicality.In addition, in TOHKEMY 2005-340759 communique, the Anneta module that adopts the structure that metal shielding board is installed is in advance disclosed.This Anneta module is set at the sheet thickness of the magnetic part of laminated iron oxysome sheet material about 0.5mm, and with PET or PPS covering surfaces, bonded metal barricade on non-communications face.This structure is difficult to carry out thin plateization, can not adapt to the miniaturization of electronic equipment in recent years.
Summary of the invention
For cleaned, the sintered ferrite substrate of thin layer, problem of the present invention is not use demoulding powder such as Zirconium oxide powder, alumina powder, and the not set each other of acquisition sintered ferrite substrate, sintered ferrite substrate can not anchor at the molded ferrite sheet of firing with on the pedestal.And problem of the present invention is to obtain not can be owing to residual demoulding powder pollutes sintered ferrite substrate electronic equipment etc., cleaning.
Near the antenna of use metal parts, usually use is equipped with sheet magnetic material etc. in advance and has adjusted the antenna of frequency.But when near work metal parts, the resonance frequency of antenna changes.Therefore, must after being installed on electronic equipment, adjust frequency.Problem of the present invention is to obtain a kind of thin Anneta module, and it does not have this loaded down with trivial details operation, even magnetic part is installed in advance, adjust frequency, and is installed near the metal parts of certain electronic equipment, does not also almost have frequency change.
In addition, problem of the present invention is near being used in metal parts the antenna, eliminates the instability of the antenna performance that is caused by the space that forms easily between magnetic part and metal shielding board.
Above-mentioned technical task can be finished by following the present invention.
The invention provides a kind of thickness is the molded ferrite sheet of 30 μ m～430 μ m, it is characterized in that, in at least one surperficial surface roughness, center line average roughness is 170nm～800nm, and maximum height is 3 μ m～10 μ m, and the area ratio/occupancy ratio at the plane of disruption of 50% degree of depth place along continuous straight runs cutting of maximum height in the square zone of 100 μ m is 10～80% (first the present invention).
The present invention is first molded ferrite sheet of the present invention, utilizes blasting treatment that asperities processing (second the present invention) is carried out on the molded ferrite sheet surface.
The present invention is first molded ferrite sheet of the present invention, utilizes Surface Machining to become concavo-convex mould or felt wrapped roll (calender roll) that press molding (the 3rd the present invention) is carried out on the molded ferrite sheet surface.
The present invention is first molded ferrite sheet of the present invention, coating and dry ferrite dispersion paints with the situation that obtains the shaping sheet material under, on the plastic film that carries out blasting treatment, apply transfer surface concavo-convex and obtain shaping sheet material (the 4th the present invention).
The present invention is first molded ferrite sheet of the present invention, in coating and dry ferrite dispersion paints under the situation with the sheet material that obtains being shaped, adjusting average grain diameter is the granularity of the ferrite powder of 0.1～10 μ m, is provided with concavo-convex (the 5th the present invention) on the surface.
The present invention is first molded ferrite sheet of the present invention, and wherein, ferrite is Ni-Zn-Cu spinel-like ferrite or Mg-Zn-Cu spinel-like ferrite (the 6th the present invention).
The present invention is that a kind of thickness is the sintered ferrite substrate of 25 μ m～360 μ m, it is characterized in that, in at least one surperficial surface roughness, center line average roughness is 150nm～700nm, and maximum height is 2 μ m～9 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 5～70% (the 7th the present invention).
The present invention is the 7th sintered ferrite substrate of the present invention, wherein, ferrite is a Ni-Zn-Cu spinel-like ferrite, and the real part μ r ' of the magnetic susceptibility during 13.56MHz is more than 80, the imaginary part μ r of magnetic susceptibility " be (the 8th the present invention) below 20.
The present invention is the 7th sintered ferrite substrate of the present invention, wherein, ferrite is a Mg-Zn-Cu spinel-like ferrite, and the real part μ r ' of the magnetic susceptibility during 13.56MHz is more than 80, the imaginary part μ r of magnetic susceptibility " be (the 9th the present invention) below 100.
The present invention is the 7th sintered ferrite substrate of the present invention, and the one side of sintered ferrite substrate is provided with conductive layer (the tenth the present invention).
The present invention is the 7th sintered ferrite substrate of the present invention, and the one side at least of sintered ferrite substrate is provided with groove (the 11 the present invention).
As the 7th the present invention or the 8th sintered ferrite substrate of the present invention, sintered ferrite substrate be pasted with bonding film on the one side at least, and sintered ferrite substrate is provided with crack (the 12 the present invention).
A kind of Anneta module, it is the conduction ring-type Anneta module that is used for wireless communication medium and wireless communication medium processing unit, the one side of magnetic part is provided with the conduction coil antenna, and the opposing face of face that is provided with the magnetic part of antenna is provided with conductive layer, wherein, magnetic part is the 7th the present invention or the 8th sintered ferrite substrate of the present invention.(the 13 the present invention).
As the 13 Anneta module of the present invention, the thickness of conductive layer is below the 50 μ m, and sheet resistance is 3 Ω/ following (the 14 the present invention).
As the 13 Anneta module of the present invention, wherein, magnetic part is the ferrite sintered substrate of Ni-Zn-Cu spinel-like, and coating acrylic compounds or epoxies electrically-conducting paint are to be provided with conductive layer (the 15 the present invention).
As the 13 Anneta module of the present invention, wherein, magnetic part is the ferrite sintered substrate of Mg-Zn-Cu spinel-like, and coating acrylic compounds or epoxies electrically-conducting paint are to be provided with conductive layer (the 16 the present invention).
As the 13 Anneta module of the present invention, wherein, magnetic part is the ferrite sintered substrate of Mg-Zn-Cu spinel-like, by utilizing silver paste to print lamination on molded ferrite sheet and one is fired, conductive layer (the 17 the present invention) is set.
As the 13 Anneta module of the present invention, wherein, magnetic part is the ferrite sintered substrate of Ni-Zn-Cu spinel-like, by utilizing silver paste to print lamination on molded ferrite sheet and one is fired, conductive layer (the 18 the present invention) is set.
Description of drawings
Fig. 1 is that ferrite is the skeleton diagram of the structural section of the Anneta module of the present invention under the ferritic situation of Ni-Zn-Cu spinel-like.
Fig. 2 is the surface configuration image of the molded ferrite sheet of embodiment 2.
Fig. 3 analyzes the image that obtains and the data of area ratio/occupancy ratio by the Bearing of the molded ferrite sheet of embodiment 2.Be illustrated in plane of disruption image, the histogram of each height and the figure of its area ratio/occupancy ratio that 50% degree of depth place along continuous straight runs of maximum height is cut open among the figure.
Fig. 4 is the surface configuration image of the sintered ferrite substrate of embodiment 2.
Fig. 5 analyzes the image that obtains and the data of area ratio/occupancy ratio by the Bearing of the sintered ferrite substrate of embodiment 2.Be illustrated in plane of disruption image, the histogram of each height and the figure of its area ratio/occupancy ratio that 50% degree of depth place along continuous straight runs of maximum height is cut open among the figure.
Fig. 6 is the surface configuration image of the molded ferrite sheet of comparative example 2.
Fig. 7 analyzes the image that obtains and the data of area ratio/occupancy ratio by the Bearing of the molded ferrite sheet of comparative example 2.Be illustrated in plane of disruption image, the histogram of each height and the figure of its area ratio/occupancy ratio that 50% degree of depth place along continuous straight runs of maximum height is cut open among the figure.
Fig. 8 is the surface configuration image of the sintered ferrite substrate of comparative example 2.
Fig. 9 analyzes the image that obtains and the data of area ratio/occupancy ratio by the Bearing of the sintered ferrite substrate of comparative example 2.Be illustrated in plane of disruption image, the histogram of each height and the figure of its area ratio/occupancy ratio that 50% degree of depth place along continuous straight runs of maximum height is cut open among the figure.
Figure 10 is the surface configuration image of the molded ferrite sheet of comparative example 5.
Figure 11 analyzes the image that obtains and the data of area ratio/occupancy ratio by the Bearing of the molded ferrite sheet of comparative example 5.Be illustrated in plane of disruption image, the histogram of each height and the figure of its area ratio/occupancy ratio that 50% degree of depth place along continuous straight runs of maximum height is cut open among the figure.
Figure 12 is the surface configuration image of the sintered ferrite substrate of comparative example 5.
Figure 13 analyzes the image that obtains and the data of area ratio/occupancy ratio by the Bearing of the sintered ferrite substrate of comparative example 5.Be illustrated in plane of disruption image, the histogram of each height and the figure of its area ratio/occupancy ratio that 50% degree of depth place along continuous straight runs of maximum height is cut open among the figure.
Figure 14 is the surface configuration image of the molded ferrite sheet of embodiment 11.
Figure 15 analyzes the image that obtains and the data of area ratio/occupancy ratio by the Bearing of the molded ferrite sheet of embodiment 11.Be illustrated in plane of disruption image, the histogram of each height and the figure of its area ratio/occupancy ratio that 50% degree of depth place along continuous straight runs of maximum height is cut open among the figure.
Figure 16 is the surface configuration image of the sintered ferrite substrate of embodiment 11.
Figure 17 analyzes the image that obtains and the data of area ratio/occupancy ratio by the Bearing of the sintered ferrite substrate of embodiment 11.Be illustrated in plane of disruption image, the histogram of each height and the figure of its area ratio/occupancy ratio that 50% degree of depth place along continuous straight runs of maximum height is cut open among the figure.
Figure 18 is the surface configuration image of the molded ferrite sheet of comparative example 10.
Figure 19 analyzes the image that obtains and the data of area ratio/occupancy ratio by the Bearing of the molded ferrite sheet of comparative example 10.Be illustrated in plane of disruption image, the histogram of each height and the figure of its area ratio/occupancy ratio that 50% degree of depth place along continuous straight runs of maximum height is cut open among the figure.
Figure 20 is the surface configuration image of the sintered ferrite substrate of comparative example 10.
Figure 21 analyzes the image that obtains and the data of area ratio/occupancy ratio by the Bearing of the sintered ferrite substrate of comparative example 10.Be illustrated in plane of disruption image, the histogram of each height and the figure of its area ratio/occupancy ratio that 50% degree of depth place along continuous straight runs of maximum height is cut open among the figure.
Figure 22 is the surface configuration image of the molded ferrite sheet of comparative example 13.
Figure 23 analyzes the image that obtains and the data of area ratio/occupancy ratio by the Bearing of the molded ferrite sheet of comparative example 13.Be illustrated in plane of disruption image, the histogram of each height and the figure of its area ratio/occupancy ratio that 50% degree of depth place along continuous straight runs of maximum height is cut open among the figure.
Figure 24 is the surface configuration image of the sintered ferrite substrate of comparative example 13.
Figure 25 analyzes the image that obtains and the data of area ratio/occupancy ratio by the Bearing of the sintered ferrite substrate of comparative example 13.Be illustrated in plane of disruption image, the histogram of each height and the figure of its area ratio/occupancy ratio that 50% degree of depth place along continuous straight runs of maximum height is cut open among the figure.
Symbol description
1: sintered ferrite substrate
2: dielectric film
3: conductive layer
4: the double-sided adhesive adhesive tape
5: conducting ring
6: peeling member
Embodiment
At first, molded ferrite sheet of the present invention is narrated.
The surface roughness of molded ferrite sheet of the present invention is, center line average roughness (Ra) is 170～800nm, and maximum height (Rmax) is 3～10 μ m.Preferred center line mean roughness is 180～700nm, and maximum height is 4～8 μ m.In addition, in the present invention, can not only use the value of center line average roughness, maximum height to represent, also need control surface concavo-convex have a frequency.In the Bearing of the square image of the 100 μ m that obtain surface roughness analyzed, the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height was 10～80%, is preferably 15～75%.As long as in this scope, even then do not use demoulding powder, can set between the molded ferrite sheet yet, can fire sintered ferrite substrate of the present invention, reach purpose of the present invention.
Be lower than 170nm or maximum height is lower than under the situation of 3 μ m, sheet material set when firing at center line average roughness.In addition, when center line average roughness surpassed 800nm or maximum height and surpasses 10 μ m, the contact area of shaping sheet material increased, demoulding difficulty.In addition, fire the sintered ferrite substrate forfeiture flatness, the fracture easily that obtain, sneak into space etc. easily on its border with dielectric film, conductive layer, the sintering sectional area also reduces, magnetic susceptibility decline, so antenna performance deterioration.The thickness of the sintered ferrite substrate after firing is that problem is especially big in the thin plate below the 200 μ m.In addition, in the square zone of 100 μ m, the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height is lower than 10% or surpass at 80% o'clock, and sheet material set when firing is difficult to separate overlapping sintered ferrite substrate.
The ferrite powder that is used for molded ferrite sheet of the present invention is Ni-Zn-Cu spinel-like ferrite powder or Mg-Zn-Cu spinel-like ferrite powder.Under the situation of using Ni-Zn-Cu spinel-like ferrite powder, be Fe
2O
3Be that 40～50Mol%, NiO are that 10～30Mol%, ZnO are that 10～30Mol%, CuO are the composition of 0～20Mol%.Under the situation of using Mg-Zn-Cu spinel-like ferrite powder, be Fe
2O
3Be that 40～50Mol%, MgO are that 15～35Mol%, ZnO are that 5～25Mol%, CuO are the composition of 0～20Mol%.Can after mixed oxide powder raw material equably, under 750 ℃～950 ℃, fire 2 hours, and pulverize and fire thing and obtain.Preferably accumulate the ferrite powder that 50% particle volume diameter is 0.5～1.0 μ m.
Below, the manufacture method of molded ferrite sheet of the present invention is narrated.
The method that obtains molded ferrite sheet of the present invention is not particularly limited, and the asperities method for processing is carried out on the surface of molded ferrite sheet of the present invention, can use the sandblast processing that is widely used in metal grinding etc.That is, the solution that will be dispersed with glass as grinding agent, aluminium oxide etc. in the aqueous solution is injected on the molded ferrite sheet, wash, thus the molded ferrite sheet that has been carried out asperities processing.
As the additive method that obtains molded ferrite sheet of the present invention, also there is following method: melting mixing ferrite powder in thermoplastics, the mould that carries out Surface Machining carries out press molding by the felt wrapped roll that carries out Surface Machining (concavo-convex grinding),, make its sheet materialization, carry out asperities processing thus.Thermoplastic resin can use polyethylene (PE), polypropylene (PP), polyvinyl butyral resin (PVB) etc.In addition, can use resins such as styrene-ethylene-butylene class, olefines as thermoplastic elastomer (TPE).Can mix as required and use two or more thermoplastic resins and/or thermoplastic elastomer (TPE).As composition, in ferrite powder 1000 weight portions, carry out the coupling processing of 10～50 weight portions, in these coupling processing ferrite powder 1000 weight portions, resin 70～120 weight portions are carried out 20～60 minutes mixing by pressurization mixer etc. under 120～140 ℃, the pressurizing mold that uses the surface to carry out concavo-convex processing forms afterwards.Considerations such as pyrolytic when firing are suitable for using low density polyethylene (LDPE) (LDPE), polyvinyl butyral resin (PVB) etc.Preferred compositing range is relative coupling agent treatment ferrite 1000 weight portions, and thermoplastic resin is 70～110 weight portions.
As the additive method that obtains molded ferrite sheet of the present invention, the method that the ferrite dispersion paints is coated on plastic film is arranged.The cooperation of ferrite dispersion paints is formed, and with respect to Ni-Zn-Cu ferrite powder 1000 weight portions, polyvinyl alcohol resin is 70～120 weight portions, is 15～25 weight portions as the butyl butyl phthalate of plasticizer, and solvent is 400～600 weight portions.Solvent can use gylcol ether, MEK, toluene, methyl alcohol, ethanol, n-butanol etc.When the operability of the dispersiveness of considering ferrite powder, mixing, drying property etc., coating preferably cooperates compositing range to be, with respect to ferrite 1000 weight portions, poly-butyral resin is 80～110 weight portions, the butyl butyl phthalate is 18～22 weight portions, and solvent is 450～550 weight portions.
Method for producing paint is not particularly limited, and uses ball mill for well.Be pre-charged with and mixed solvent and ferrite after add resin and plasticizer, and mix, thereby obtain uniform coating.In order to prevent when coating is dry, on coated film, to crack, be very important with the coating that the obtains de-bubble of in vacuum tank, reducing pressure fully.
The coating method of ferrite dispersion paints is not particularly limited, and can use roll coater, scraper.Consider from the stability of thickness precision, coating, use scraper for well.Utilize scraper to apply the thickness of wishing on plastic film, drying is 30～60 minutes under 80～130 ℃, can access molded ferrite sheet.
The application plastic film that is coated with to the ferrite dispersion paints is not particularly limited, and can use various films such as polyethylene (PE), polypropylene (PP), PETG (PET), polyimides are carried out sandblast processing and the film that obtains.Consider preferred PETG (PET) film from the processability on film surface, thermal stability when coating is dry.By using the plastic film that has carried out blasting treatment, the concavo-convex molded ferrite sheet that is needed on of plastic film can be able to be accessed the shaping sheet material of the surface roughness with hope.
The another method that obtains molded ferrite sheet of the present invention is to adjust the method for the surface roughness of molded ferrite sheet by the granularity of ferrite powder.Above-mentioned ferrite dispersion paints is being coated in the method for plastic film, use mixes accumulation 50% particle volume diameter in accumulating ferrite powder 100 weight portions that 50% particle volume diameter is 0.1～1.0 μ m be the ferrite powder of ferrite powder 5～40 weight portions of 3～10 μ m, thereby, even use the common plastic film that does not carry out sandblast processing, also can access the molded ferrite sheet of surface roughness of the present invention.When considering the surface roughness of sheet material, mixing accumulation 50% particle volume diameter is that powder 10～40 weight portions of 3～7 μ m are suitable in accumulating powder 100 weight portions that 50% particle volume diameter is 0.3～0.7 μ m.
In the present invention, fire above-mentioned molded ferrite sheet, obtain sintered ferrite substrate.
Sintered ferrite substrate of the present invention to fire at the porosity be that overlapping 5～20 left and right sides molded ferrite sheets of the present invention carry out on 30% the alumina plate.Firing under the condition, be provided with that to use electric furnace etc. to remove resinous principle and make the processing (process) of ferrite particle growth be important.Removing under 150 ℃～550 ℃ of resin carried out 5～80 hours, and being grown under 850 ℃～1200 ℃, 1～5 hour the condition of ferrite particle carried out.
Add thermal deformation, fracture for what prevent sheet material, removing of resinous principle is to keep uniform temperature ground to carry out to good after room temperature heats up about with 10～20 ℃/hour.In addition, keep uniform temperature after preferably heating up with 30～60 ℃/hour thereafter, carry out sintering fully, slowly cooling after the ferrite particle growth.Wherein, the maintenance temperature and time that each is handled is chosen to be optimal conditions according to the sheet number of the molded ferrite sheet of handling and gets final product.
Below, sintered ferrite substrate of the present invention is narrated.
In the surface roughness of sintered ferrite substrate of the present invention, center line average roughness (Ra) is 150～700nm, and maximum height (Rmax) is 2～9 μ m.Preferred center line mean roughness (Ra) is 160～600nm, and maximum height is 3～8 μ m.
In addition, in the square zone of 100 μ m, the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height is 5～70%, is preferably 10～60%, more preferably 10～50%.
By firing above-mentioned molded ferrite sheet, can make center line average roughness (Ra) for more than the 150nm, maximum height (Rmax) is more than the 2 μ m, when center line average roughness (Ra) surpasses 700nm or maximum height (Rmax) and surpasses 9 μ m, the forfeiture flatness, easily fracture is sneaked into space etc., the antenna performance deterioration easily on the interface of itself and dielectric film, conductive layer.And the sintering sectional area descends, and magnetic susceptibility reduces.For example the thickness of the sintered ferrite substrate after firing is in the thin plate below the 200 μ m, to become bigger problem.
In addition, by firing above-mentioned molded ferrite sheet, in the square zone of 100 μ m in the scope of area ratio/occupancy ratio 5～70% of the plane of disruption that 50% degree of depth place along continuous straight runs of maximum height is cut open.
The sintered density of sintered ferrite substrate of the present invention is 4.6～5.0g/cm
3When the sintered density of sintered ferrite substrate is lower than 4.4g/cm
3The time, since the sintering deficiency, fracture, and the real part μ r ' step-down of magnetic susceptibility easily.In addition, do not need to carry out sintering until surpassing 5.0g/cm
3Be preferably 4.5～4.9g/cm
3
Sintered ferrite substrate of the present invention one side at least is provided with bonding film, can be used in the crack is set on substrate, makes laminated body have bendability.At this moment, magnetic susceptibility can reduce when the crack is set, but changes according to the different magnetic susceptibilities of the state in crack, therefore the groove of systematicness preferably is set on substrate, because be easy to generate fracture from the part of groove, thus give bendability, and can make that the magnetic characteristic that is provided with behind the crack is stable.
The groove that is provided with on the sintered ferrite substrate of the present invention can be, the angle of the front end that is provided with on the one side of shaping sheet material by embossing roller for machining, steel edge etc. is the groove of the V-types of 25～45 degree.
Groove be at interval, the lowest point of groove be spaced apart 1～5mm.When being lower than 1mm, when groove fractures sintered ferrite substrate, magnetic susceptibility reduces, and processing difficulties.When surpassing 5mm, the flexible reduction of sintered ferrite substrate.Groove more preferably be 2～4mm at interval.
The degree of depth of groove is 0.4～0.7 with the ratio (degree of depth/sheet thickness of groove) of the thickness of shaping sheet material.When the ratio of groove depth/sheet thickness is lower than 0.4, exist not along the situation of groove fracture, it is inhomogeneous to rupture, the magnetic susceptibility instability.When groove depth surpasses 0.7, exist in the situation about rupturing along groove in the processing of firing.The preferable range of groove depth is that the ratio of groove depth/sheet thickness is 0.4～0.6.
In addition, the pattern of the groove of describing on the sheet face can be any in equilateral triangle, clathrate or the polygonal etc.Importantly, when sintered ferrite substrate when groove disconnects, make that to disconnect individual sheet (Ge sheet) that forms be a sheet uniformly as far as possible, even feasible curved substrate, magnetic susceptibility does not change as far as possible yet.
Because sintered ferrite substrate of the present invention is thinner; fracture easily; make the crack so at least simultaneously, fit after the bonding diaphragm; known; under the situation of using Ni-Zn-Cu spinel-like ferrite powder; the real part μ r ' of the magnetic susceptibility when keeping 13.56MHz is more than 80, the imaginary part μ r of magnetic susceptibility " be below 20; give suitable pliability to sintered ferrite substrate, the thin layer sintered ferrite substrate of 25～360 μ m that use as the coil antenna module is excellent especially.
When the real part μ r ' of the magnetic susceptibility of the sintered ferrite substrate that uses Ni-Zn-Cu spinel-like ferrite powder was lower than 80, the coil inductance of Anneta module reduced, and communication distance shortens.As the imaginary part μ of magnetic susceptibility r " when surpassing 20, loss increases, and the Q value of antenna reduces, and communication distance shortens.Preferred μ r " be below 10.Further preferred μ r " be below 5.
Known in addition, under the situation of using Mg-Zn-Cu spinel-like ferrite powder, the real part μ r ' of the magnetic susceptibility when keeping 13.56MHz is more than 80, the imaginary part μ r of magnetic susceptibility " be below 100; give suitable pliability to sintered ferrite substrate, the thin layer sintered ferrite substrate of 25～360 μ m that use as the coil antenna module is excellent especially.
When the real part μ r ' of the magnetic susceptibility of the sintered ferrite substrate that uses Mg-Zn-Cu spinel-like ferrite powder was lower than 80, the coil inductance of Anneta module reduced, and communication distance shortens.As the imaginary part μ of magnetic susceptibility r " when surpassing 150, loss increases, and the Q value of antenna reduces, and communication distance shortens.The real part μ r ' of preferred magnetic susceptibility is more than 85, imaginary part μ r " be below 90.
Below, Anneta module of the present invention is narrated.
Anneta module of the present invention by on the one side as the sintered ferrite substrate of magnetic part the conduction coil antenna being set, and being provided with conductive layer and obtaining on the opposing face of the face of the magnetic part that is provided with antenna.The conduction coil antenna is made by the conducting ring (loop) that forms Vorticose thickness 20～30 μ m on the one side of dielectric films such as the polyimide film of thickness 20～60 μ m, PET film.
Can use on the one side of the ferrite sintered substrate of thickness 25～360 μ m coating electrically conductive coating and carry out drying and conductive layer is set or before molded ferrite sheet is fired, carries out one to fire after the printing lamination silver paste and sintered ferrite substrate that conductive layer is set.The thickness of conductive layer is preferably 5～50 μ m.By bonding conduction coil antenna of the two-sided tape of thickness 20～60 μ m and the face opposite with the conductor planes of sintered ferrite substrate, on conductor planes, also paste same jointing tape, as shown in Figure 1, obtain the Anneta module that gross thickness is 110～620 μ m.
Dielectric film is not particularly limited, and is above as long as sheet resistance is 5M Ω/, in order to prevent small leakage current, preferably more than 10M Ω/.
Can use the electrically-conducting paint in organic solvents such as to be scattered in butyl acetate, toluene as the copper of conductive filler with silver-colored powder and acrylic resin, the epoxy resin.
Coating electrically conductive coating on the one side of sintered ferrite substrate, dry solidification is 30 minutes～3 hours in the air atmosphere of room temperature to 100 ℃, and the conductive layer that 20～50 μ m are set is for well.The sheet resistance of conductive layer is preferably set to 3 Ω/below the.Antenna characteristics changes when working near metal in order further to dwindle, and making sheet resistance is 1 Ω/below the.In addition, in order to make the laminated thickness attenuation, preferred 20～30 μ m.
In addition, the sintered ferrite substrate of band conductive layer also can be processed conducting resinl by raw cook (green sheet) method, fires method by one and obtains.For conductive layer is not exposed from electronic equipment internal, also can the laminated insulation diaphragm.Method as is well known in parallelly in ring is inserted capacitor and resonance frequency is adjusted into 13.56MHz, and the Anneta module that obtains is with the frequency resonance of hope.
Make as described above the conduction coil antenna, adhesive linkage, ferrite sintered substrate, conductive layer connects airtight and carry out integrated, and the parallel capacitor that imports in cyclic loop, resonance frequency is adjusted into the Anneta module of 13.56MHz, even near the metal parts of various electronic equipments, work, the variation of antenna performance is also few, can guarantee stable communication.
According to the present invention, even not using Zirconium oxide powder, alumina powder etc. to carry out the demoulding handles, can access does not have set, cleaning, thin sintered ferrite substrate yet, and the sintered ferrite substrate that can be caused pollution by dispersing of separating powder etc. can be provided when being installed in the electronic equipment also not.
According to the present invention, the real part μ r ' of the magnetic susceptibility the during 13.56MHz of the sintered ferrite substrate by making 25～360 μ m is more than 80, the imaginary part μ r of magnetic susceptibility " be (ferrite is the ferritic situation of Ni-Zn-Cu spinel-like) below 20 or 100 following (ferrite is the ferritic situation of Mg-Zn-Cu spinel-like), can access the magnetic part that is applicable to Anneta module.Its thin layer contribution to Anneta module is very big.
According to the present invention, near the Anneta module that metal parts, uses, on as the sintered ferrite substrate of magnetic part, form thin conductive layer by application, printing lamination, therefore, the thickness of Anneta module can be thinned to about 100～580 μ m.In addition,, under the state of one lamination conduction annulus, magnetic part (soft ferromagnetic layer) and conductive layer, adjust resonance, so the antenna characteristics variation after the equipment installation is few, thereby after equipment is installed, does not need loaded down with trivial details adjustment according to the present invention.
According to the present invention, near the Anneta module that metal parts, uses, because between magnetic part and conductive layer, all there is not the space, so antenna performance is highly stable.
According to the present invention, be used as on the sintered ferrite substrate of magnetic part, at least be fitted with bonding film on the one side, the crack of the bendability that produces substrate is set, thereby can make magnetic part have pliability, therefore processing ease, and can make the characteristic variations minimum of the Anneta module that the crack by magnetic part causes.
Molded ferrite sheet of the present invention can easily be provided with suitable surface roughness on the one side at least, even under overlapping state, fire, under the situation of not using demoulding powder, carry out sintering, also can be at the industrial molded ferrite sheet that obtains not set.
Sintered ferrite substrate of the present invention, even thinner thickness also can be realized high magnetic susceptibility, and do not use demoulding powder ground such as zirconia, aluminium oxide overlapping and fire and make, therefore, do not have powder to pollute in the time of in being installed in electronic equipment, be suitable for RFID (the Radio Frequency Identification: the purposes of the antenna module-use magnetic core that the high-density installation radio-frequency (RF) identification) is used that popularizes fast in recent years.
The conductive layer that on the one side of sintered ferrite substrate of the present invention, connect airtight, lamination has 20～50 μ m, and make itself and the antenna integrated Anneta module of conduction ring-type, even work near the electronic equipment in RFID (RadioFrequency Identification) communication metal, its characteristic does not almost change yet, and, because can make the thinner thickness of module, so can also tackle the high-density installation of electronic equipment.
Embodiment
The assay method of each measured value shown in the narration embodiment.
[surface roughness]
Use atomic force microscope AFM (Digital Instrument society makes Nano ScopeIII), measure the square zone of 100 μ m, ask for the surface roughness (center line average roughness Ra, maximum height Rmax) of molded ferrite sheet and sintered ferrite substrate.
For the concaveconvex shape of presentation surface, quantize by Bearing analysis software with device.According to the image of the surface roughness of asking for, obtain the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of its maximum height (Rmax), thereby can compare the concaveconvex shape state.That is, under the situation of molded ferrite sheet, if this area ratio/occupancy ratio is 10～80%, the set after then can preventing to fire.When the sintered ferrite substrate after firing was measured, not having the area ratio/occupancy ratio under the situation of sintered ferrite substrate of set was 5～70%.The mensuration of the surface roughness of the sintered ferrite substrate that the set of comparative example is serious does not have the position of set to carry out in the substrate to fracture.
[accumulating 50% particle volume diameter]
Use the system Microtrac MT3300 of Nikkiso Company Limited, utilize damp process to measure the average grain diameter of ferrite powder.In the aqueous solution 100ml of the non-ionic surfactant as interfacial agent (manufacturing of TritonX-100Dow Chemical society) that comprises 0.2% the hexa metaphosphoric acid as dispersant (acid of ヘ キ メ リ Application) and 0.05%, add ferrite powder 5g, with ultrasonic homogenizer (model: 300W, Nikkiso Company Limited makes) carry out 300 seconds dispersion after, be to measure volume distributed median under the aspheric condition in minute 30 seconds, measurement range 0.021～1408 μ m, solvent refractive index 1.33, particle refractive index 2.94, shape of particle.
[thickness of sheet material]
To cutting into 4 angles that overall dimension is the tetragonal shaping sheet material of length of side 80mm, the electronic digital display indicating device ID-S112 that uses Mitutoyo Co., Ltd. to make measures the thickness of sheet material, averaged.
[sintered density]
The sintered density of sintered ferrite substrate is calculated by the volume and weight of obtaining according to the outside dimension of sample.
[magnetic susceptibility]
The mensuration of magnetic susceptibility cuts into ring (ring) shape of external diameter φ 14mm, internal diameter φ 8mm with sintered ferrite substrate, measures the thickness of ring, makes test film.Use impedance analysis device HP4291A (manufacturing of Hewlett-Packard society) and be installed on the anchor clamps (HP1645A) of its testboard, or impedance analysis device E4991A (manufacturing of Agilent Technologies society) and be installed on the anchor clamps (16454A) of its testboard, the value when measuring frequency 13.56MHz.
[resonance frequency and resonance degree]
The resonance characteristics of Anneta module is to measure the resonance characteristics of the conduction coil antenna that is made of the structure of putting down in writing among Fig. 1.Its method is, measure the frequency characteristic of impedance of the supply line of laminated antenna module shown in Figure 1, capacitor is connected in parallel in supply line, and adjust its electrostatic capacitance, at resonance frequency is under the state of 13.56MHz, and the impedance analysis device HP4291A that uses Hewlett-Packard society to make measures resonance degree Q.In embodiment 7～9,16～18 and comparative example 6～8,14～16, in order to compare, lamination has resonance frequency under the situation of Anneta module and iron plate and the mensuration of resonance degree Q, carries out under the condition of setting under the situation of lamination iron plate not.
[sheet resistance]
Use low-resistivity meter Loresta-GP (MCP-T600 type, Mitsubishi chemical Co., Ltd makes), measure the sheet resistance of conductive layer by 4 sonde methods (according to JISK7149).
[embodiment 1]
The Ni-Zn-Cu ferrite powder (composition: Fe that accumulation 50% particle volume diameter is 0.7 μ m that is adjusted to 1000 weight portions
2O
3: 48.5Mol%, NiO:20.5Mol%, ZnO:20.5Mol%, CuO:10.5Mol%, fire condition: 850 ℃ 90 minutes) carry out resulting ferrite powder 1000 weight portions of surface treatment by the titante coupling agent of 10 weight portions (Ajincomoto Co., Inc makes KR-TTS), and thermoplastic elastomer (TPE) (TOSOH Co., Ltd. makes LUMITAC22-1) 50 weight portions, density 0.9g/cm
3Polyethylene 100 weight portions, stearic acid 20 weight portions, by the pressurization mixer 130 ℃ mixing 40 minutes down.The use sandblast is processed as the iron plate of center line average roughness 450nm, maximum height 8 μ m, at 160 ℃ of temperature, pressure 100kg/cm
2, 3 minutes pressing times condition under, the ferrite resin that obtains is formed mixing thing carries out press molding, making thickness is that 77 μ m, size are the tetragonal molded ferrite sheets of length of side 100mm.With overlapping 10 of this sheet material.Going up by clamping up and down as the aluminium oxide setter (Kikumizu Chemical Industry Co., Ltd.'s manufacturing) of firing pedestal, 500 ℃ of following degreasings 10 hours, under 920 ℃, fired 2 hours, peel off sinter after the cooling, plate can not have damaged ground easily to be stripped from.The sintered ferrite substrate thickness that obtains is that 65 μ m, overall dimension are the quadrangles of length of side 80mm.Cut out the test film of external diameter φ 14mm, internal diameter φ 8mm from this sintered plate, use impedance analysis device HP4291A (manufacturing of Hewlett-Packard society) and be installed on the anchor clamps (HP16454A) of its testboard, magnetic susceptibility when obtaining frequency 13.56MHz is that μ r ' is 98, μ r " be 2.2, the sintered ferrite substrate that does not have set and have excellent magnetic characteristics.
The surface roughness of the molded ferrite sheet that obtains is, center line average roughness is 420nm, maximum height is 6.5 μ m, and in the square zone of 100 μ m, the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height is 48%.In addition, the surface roughness of sintered ferrite substrate is, center line average roughness is 400nm, and maximum height is 5.5 μ m, in the square zone of 100 μ m, the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height is 45%.
[embodiment 2]
Ni-Zn-Cu ferrite 100 weight portions that will be identical and BPBG (butyl phthalyl butyl glycolate) 2 weight portions, polyvinyl alcohol resin (Sekisui Chemical Co., Ltd makes S-LEC B BM-1) 12 weight portions, be mixed into n-butanol 4: solvent 60 weight portions of toluene 6 as solvent with embodiment 1; mix, dissolve, disperse with ball mill, obtain the ferrite dispersion paints.By oily rotary vacuum pump the ferrite dispersion paints is reduced pressure after the de-bubble, on one side, is that 530nm, maximum height are to carry out certain thickness coating on the PET film (Panac Industrial Co., Ltd makes Le ミ マ Star ト 50S200 ト レ ス) of 5.6 μ m with scraper become center line average roughness by blasting treatment, with 100 ℃ heated-air dryings 30 minutes, obtain the molded ferrite sheet of thickness 204 μ m.The molded ferrite sheet that obtains is cut into the tetragonal size of length of side 100mm, peel off, under the condition identical, the sheet material that obtains is fired with embodiment 1 from the PET film.The evaluating characteristics of the sintered ferrite substrate that obtains, the result, thickness is 160 μ m, overall dimension is the quadrangle of length of side 80mm, the magnetic susceptibility during 13.56MHz is that μ r ' is 96, μ r " be 3, do not have set, peel off easily.
The surface roughness of the molded ferrite sheet that obtains is, center line average roughness is 370nm, maximum height is 4.0 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 73%.Be respectively 104nm, 1.3 μ m with center line average roughness, the maximum height of the opposite face of the face of PET film contact, the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 93%, as can be known can be by using PET film, control surface roughness wittingly.In addition, the surface roughness of sintered ferrite substrate is, center line average roughness is 292nm, and maximum height is 3.5 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 12%.
[embodiment 3]
Mixing accumulation 50% particle volume diameter is the Ni-Zn-Cu ferrite powder (composition: Fe of 6 μ m
2O
3: 48.5Mol%, NiO:20.5Mol%, ZnO:20.5Mol%, CuO:10.5Mol%, fire condition: 1000 ℃ 90 minutes) 300 weight portions are Ni-Zn-Cu ferrite 700 weight portions of 0.7 μ m with accumulation 50% particle volume diameter identical with embodiment 1, in addition the method by similarly to Example 1 obtains ferrite resin and forms mixing thing.Using and being processed as center line average roughness is the iron plate of 2 μ m as 120nm, maximal roughness, at 160 ℃ of temperature, pressure 100kg/cm
2, 3 minutes pressing times condition under the mixing thing that obtains is carried out press molding, make the molded ferrite sheet of thickness 200 μ m, overall dimension 100mm.Carry out under the condition identical, handling the evaluation of the sintered ferrite substrate of the sheet material gained that obtains with embodiment 1, the result, thickness is 167 μ m, the magnetic susceptibility during 13.56MHz is that μ r ' is 80, μ r " be 1.1, do not have set, peel off easily.
Owing to mixed the ferrite oversize grain, the surface roughness of the molded ferrite sheet that obtains is, center line average roughness is 270nm, maximum height is 5.0 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 20%.In addition, the surface roughness of sintered ferrite substrate is, center line average roughness is 250nm, and maximum height is 4.0 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 18%.
[embodiment 4]
Except obtain the condition of molded ferrite sheet that thickness is 42 μ m when applying with scraper, the method by similarly to Example 2 obtains sintered ferrite substrate.The evaluating characteristics of the sintered ferrite substrate that obtains, the result, thickness is 37 μ m, the magnetic susceptibility during 13.56MHz is that μ r ' is 95, μ r " be 2, do not have set, peel off easily.
The surface roughness of the molded ferrite sheet that obtains is, center line average roughness is 435nm, maximum height is 6.3 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 52%.In addition, the surface roughness of sintered ferrite substrate is, center line average roughness is 425nm, and maximum height is 4.9 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 50%.
[embodiment 5]
Except obtain the condition of molded ferrite sheet that thickness is 405 μ m when applying with scraper, the method by similarly to Example 2 obtains sintered ferrite substrate.The evaluating characteristics of the sintered ferrite substrate that obtains, the result, thickness is 350 μ m, the magnetic susceptibility during 13.56MHz is that μ r ' is 102, μ r " be 3.2, do not have set, peel off easily.
The surface roughness of the molded ferrite sheet that obtains is, center line average roughness is 409nm, maximum height is 6.8 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 58%.In addition, the surface roughness of sintered ferrite substrate is, center line average roughness is 388nm, and maximum height is 5.6 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 41%.
[comparative example 1]
Make ferrite resin by method similarly to Example 1 and form mixing thing, using and being processed into center line average roughness is the iron plate clamping constituent of 2 μ m as 120nm, maximal roughness, form, in addition under same condition, make sintered ferrite substrate, the result, set is serious, be difficult to peel off, though a part is stripped from out, palette ruptures, and fails to produce the tetragonal sintered ferrite substrate of a length of side 80mm.And the magnetic susceptibility the during 13.56MHz of sintered ferrite substrate is that μ r ' is 98, μ r " be 1.9.
The surface roughness of the molded ferrite sheet that obtains is, center line average roughness is 115nm, maximum height is 1.8 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 2%.In addition, the surface roughness of sintered ferrite substrate is, center line average roughness is 98nm, and maximum height is 1.1 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 2%.
[comparative example 2]
Make the ferrite dispersion paints by method similarly to Example 2.At the center line average roughness that does not carry out sandblast processing is that 17nm, maximum height are that 0.3 μ m, thickness are on the PET film of 50 μ m, with scraper the coating that obtains is carried out certain thickness coating, by 100 ℃ of heated-air dryings 30 minutes, obtain the molded ferrite sheet of thickness 202 μ m.This sheet material is peeled off from the PET film, and overlapping 10, carried out identical with embodiment 1 fire processing, the evaluation of the sintered ferrite substrate that obtains.Thickness is 165 μ m, and set is serious, can not peel off.
The surface roughness of the molded ferrite sheet that obtains is, center line average roughness is 66nm, maximum height is 1.3 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 90%.In addition, the surface roughness of sintered ferrite substrate is, center line average roughness is 44nm, and maximum height is 0.9 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 1%.
[comparative example 3]
After making sheet material with the same method of comparative example 2, from PET film releasing sheet, with molded ferrite sheet face that the face of film contacts on, by brushing (brushing) coating 50mg average grain diameter is the Zirconium oxide powder (N. E. Chemcat Corp.'s manufacturing) of 5 μ m, carry out afterwards with comparative example 2 same fire processing, the evaluation of the sintered ferrite substrate that obtains.Magnetic susceptibility during the 13.56MHz of sintered ferrite substrate is that μ r ' is 96, μ r " be 1.8, but confirm to exist Zirconium oxide powder to anchor at the position on sintered ferrite substrate surface, when it is removed with brush, 3 plates fractures in 10.The coating of powder and to remove operation very loaded down with trivial details can not be removed Zirconium oxide powder fully.
[comparative example 4]
Using sandblast to be processed into center line average roughness is the iron plate of 14 μ m as 1200nm, maximum height, and in addition the method by similarly to Example 1 obtains sintered ferrite substrate.Do not have set, can not damage plate ground and peel off.Magnetic susceptibility during the 13.56MHz of sintered ferrite substrate is that μ r ' is 75, μ r " be 0.6, be the value that can not satisfy magnetic characteristic.This is that the result increases in the space on the cross section of sintered ferrite substrate because surface roughness is excessive, so magnetic susceptibility reduces.
[comparative example 5]
Make the ferrite dispersion paints by method similarly to Example 2.Carrying out roughness processing, center line average roughness is that 252nm, maximum height are on the PET film (TeijinDuPont Films Co., Ltd. makes U4-50) of 3.3 μ m, with scraper the coating that obtains is carried out certain thickness coating, drying is 30 minutes in 100 ℃ of hot blasts, obtains the molded ferrite sheet of thickness 200 μ m.This sheet material is peeled off and overlapping 10 from the PET film, carried out identical with embodiment 1 fire processing, the evaluation of the sintered ferrite substrate that obtains.Thickness is 171 μ m, and set is serious, can not peel off.The surface roughness of the molded ferrite sheet that obtains is, center line average roughness is 319nm, maximum height is 3.3 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 95%.In addition, the surface roughness of sintered ferrite substrate is, center line average roughness is 246nm, and maximum height is 3.3 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 96%.
That is, by this result as can be known, in order to pursue effect of the present invention, be not only surface roughness, the control of the area ratio/occupancy ratio of the plane of disruption is also very important.
Table of induction as a result is shown in table 1.
[table 1]
[embodiment 6]
On the concavo-convex machined surface of the sintered ferrite substrate that obtains by embodiment 1, paste the two-sided tape (goods name 467MP, Sumitomo 3M makes) of thickness 50 μ m, make the laminated body that constitutes by 63 μ m sintered ferrite substrate layers and 50 μ m adhesive linkages.In order to make this laminated body have bendability, it is loaded on the polyurethane sheet that thickness 10mm, expansion ratio be about 10 times, use the rubber rollers of the about 50mm of profile, the about 15cm of width, the pressure that with the roller linear pressure serves as about 1kg/cm is to laminated body longitudinal and transverse pressurization respectively, in sintered ferrite substrate integral body, the crack is set, stamping-out becomes profile 14mm φ, internal diameter 8mm φ afterwards, and measures magnetic susceptibility.Magnetic susceptibility is that μ r ' is 83 when 13.56MHz, μ r " be 0.8.In addition, same laminated body is wound into the iron staff of profile 30mm φ after, cut out and above-mentioned same test film, measure magnetic susceptibility, consequently μ r ' be 82.5, μ r " be 0.8, almost do not change; bendability is good, and magnetic susceptibility μ r ' is more than 80, and is also good.
[embodiment 7]
The PET film that is produced on 25 μ m is provided with the flat plane antenna of the Vorticose conducting ring of 7 circles (turn), and its annular shape is the rectangle of vertical 45mm, horizontal 75mm.In addition, use the Ni-Zn-Cu ferrite that uses among the embodiment 1, make the molded ferrite sheet of thickness 180 μ m, on the shaping sheet surface, utilize each Thomson cutter (ト system ソ Application of 30 ° of point of a knife of V-type by method similarly to Example 2
), the V groove of the about 90 μ m of the degree of depth is set with the clathrate that is spaced apart 2mm.The molded ferrite sheet of the trough of belt that obtains is cut into the quadrangle of length of side 100mm, peel off, under the condition identical, the sheet material that obtains is fired with embodiment 1 from the PET film.The sintered ferrite substrate thickness that obtains is 150 μ m, and overall dimension is the quadrangle of length of side 80mm.On the face that does not have groove of sintered ferrite substrate, be coated in the electrically-conducting paint (trade name Dotite XE-9000, Fujikura Kasei Co., Ltd make) that is dispersed with silver and copper powders may in the polyester resin, drying is 30 minutes under 50 ℃, and the conductive layer of 30 μ m is set.The sheet resistance of conductive layer is 0.2 Ω/.After on this conducting surface, pasting two-sided tape (goods name 467MP, 3M Co., Ltd. in Sumitomo makes), cut ferrite sintered substrate, give bendability by method similarly to Example 6.At this moment, ferritic sheet is the quadrangle of length of side 2mm, is roughly uniform shape.The magnetic susceptibility of this sheet material is that μ r ' is 84, μ r " be 0.4.
The two-sided tape of used thickness 50 μ m (goods name 467MP, 3M Co., Ltd. in Sumitomo makes) is pasted the face that conductive layer is not set of conduction coil antenna and sintered ferrite substrate, makes Anneta module in not interstitial mode on binding face.Because the resonance frequency of this module is 10.8MHz, Q is 68, so the capacitor that is connected in parallel on coil antenna makes the capacitance variations of capacitor, adjusts, and makes that resonance frequency is 13.5～13.6MHz.After adjusting frequency, Q is 64.The conductor planes of this Anneta module and the iron plate of thickness 1mm are connected airtight, measure resonance characteristics.Its result, whether iron plate is irrelevant with installing, and does not observe the variation of resonance characteristics.
[embodiment 8]
In the Anneta module that the method by similarly to Example 7 is made, the conductive layer of sintered ferrite substrate is, coating nickel-acrylic compounds electrically-conducting paint (trade name DotiteFN-101), drying is 30 minutes under 50 ℃, coating thickness is 10 μ m, sheet resistance is 2 Ω/, in addition, carries out evaluation similarly to Example 7.Its result, resonance characteristics are that resonance frequency is that 13.6MHz, Q are 60, and whether iron plate is irrelevant with installing, and does not almost observe variation.
[embodiment 9]
Be provided with at printing lamination conduction silver paste on the raw cook and under 900 ℃, carry out the sintered ferrite substrate that one is fired the conductive layer of the 10 μ m that form in use, in addition in the Anneta module that the method by similarly to Example 7 is made, carry out evaluation similarly to Example 7.The sheet resistance of conductive layer is 0.1 Ω/, and resonance characteristics is that resonance frequency is 13.55MHz, and Q is 66, and whether iron plate is irrelevant with installing, and does not almost observe variation.
[comparative example 6]
Conductive layer is not set on sintered ferrite substrate, and the method for in addition passing through similarly to Example 7 constitutes Anneta module.Resonance frequency when not having lamination iron plate is 13.55MHz, and Q is 67.Similarly to Example 7, to the iron plate of its laminated thickness 1mm and measure resonance characteristics, resonance frequency becomes 11.5MHz, to lower frequency side skew 2MHz.Q is 67, and the resonance degree does not change, but because frequency shift (FS), so do not produce resonance under 13.56MHz, result's intensity of communicating by letter significantly reduces.
[comparative example 7]
Adopt the structure same, except the thickness setting with sintered ferrite substrate is 300 μ m, carry out the evaluation same with comparative example 6 with comparative example 6.If lamination iron plate, then resonance frequency is 12.5MHz, and to compare frequency change less with comparative example 6, but communication intensity reduces.
[comparative example 8]
In the Anneta module that the method by similarly to Example 7 is made, the thickness that is arranged on the conductive layer on the sintered ferrite substrate is 5 μ m, its sheet resistance is 5 Ω/, estimates in addition adopting the resonance characteristics of the Anneta module of structure similarly to Example 7.Its result, if lamination iron plate, then variation of resonant frequency is 10.9MHz, the communication intensity of 13.56MHz also reduces.
[embodiment 10]
The Mg-Zn-Cu ferrite powder (composition: Fe that accumulation 50% particle volume diameter is 0.7 μ m that is adjusted to 1000 weight portions
2O
3: 48.5Mol%, MgO:27.0Mol%, ZnO:14.5Mol%, CuO:10.0Mol%, fire condition: 850 ℃ 180 minutes) carry out resulting ferrite powder 1000 weight portions of surface treatment by the titante coupling agent of 10 weight portions (Ajincomoto Co., Inc makes KR-TTS), and thermoplastic elastomer (TPE) (TOSOH Co., Ltd. makes LUMITAC22-1) 50 weight portions, density 0.9g/cm
3Polyethylene 100 weight portions, stearic acid 20 weight portions, with the pressurization mixer 130 ℃ mixing 40 minutes down.Using sandblast to be processed into center line average roughness (Ra) is the iron plate of 8 μ m as 450nm, maximum height (Rmax), at 160 ℃ of temperature, pressure 100kg/cm
2, 3 minutes pressing times condition under, the ferrite resin that obtains is formed mixing thing carries out press molding, making thickness is that 74 μ m, size are the tetragonal molded ferrite sheets of length of side 100mm.
With overlapping 10 of the molded ferrite sheet that obtains.Going up by clamping up and down,, under 940 ℃, fired 2 hours 500 ℃ of following degreasings 10 hours as the aluminium oxide setter (Kikumizu Chemical Industry Co., Ltd.'s manufacturing) of firing base.Peel off sinter after the cooling, plate can not have damaged ground easily to be stripped from.
The thickness of the sintered ferrite substrate that obtains is 60 μ m, and overall dimension is the quadrangle of length of side 80mm.Cut out the test film of external diameter φ 14mm, internal diameter φ 8mm from this sintered plate, use impedance analysis device E4991A (Agilent Technologies (strain) manufacturing) and be installed on the anchor clamps (16454A) of its testboard, magnetic susceptibility when obtaining frequency 13.56MHz is that μ r ' is 161, μ r " be 48, the sintered ferrite substrate that does not have set and have excellent magnetic characteristics.
The surface roughness of the molded ferrite sheet that obtains is, center line average roughness (Ra) is 380nm, maximum height (Rmax) is 4.8 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 38%.
In addition, the surface roughness of sintered ferrite substrate is, center line average roughness (Ra) is 366nm, and maximum height (Rmax) is 4.1 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 31%.
[embodiment 11]
Mg-Zn-Cu ferrite 100 weight portions that will be identical and BPBG 2 weight portions, polyvinyl alcohol resin (Sekisui Chemical Co., Ltd makes S-LEC B BM-1) 12 weight portions, be mixed into n-butanol 4: solvent 60 weight portions of toluene 6 as solvent with embodiment 10; mix, dissolve, disperse with ball mill, obtain the ferrite dispersion paints.By oily rotary vacuum pump the ferrite dispersion paints is reduced pressure after the de-bubble, utilizing scraper to be become center line average roughness (Ra) by blasting treatment in one side is to carry out certain thickness coating on the PET film (Panac Industrial Co., Ltd makes Le ミ マ Star ト 50S200 ト レ ス) of 5.6 μ m for 530nm, maximum height (Rmax), drying is 30 minutes in 100 ℃ of hot blasts, obtains the molded ferrite sheet of thickness 210 μ m.
The molded ferrite sheet that obtains is cut into the tetragonal size of length of side 100mm, peel off, under the condition identical, the sheet material that obtains is fired with embodiment 10 from the PET film.
The evaluating characteristics of the sintered ferrite substrate that obtains, the result, thickness is 174 μ m, overall dimension is the quadrangle of length of side 80mm, the magnetic susceptibility during 13.56MHz is that μ r ' is 158, μ r " be 33, do not have set, peel off easily.
The surface roughness of the molded ferrite sheet that obtains is, center line average roughness (Ra) is 450nm, maximum height (Rmax) is 5.1 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 40%.
The center line average roughness (Ra) of the opposing face of the face that contacts with the PET film, maximum height (Rmax) are respectively 131nm, 1.8 μ m, the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 97%, as can be known can be by the PET film that uses, control surface roughness wittingly.
In addition, the surface roughness of sintered ferrite substrate is, center line average roughness (Ra) is 338nm, and maximum height (Rmax) is 3.6 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 21%.
[embodiment 12]
Carry out under the condition identical, handling the sheet material that obtains and the evaluation of the sintered ferrite substrate that obtains with embodiment 10.Its result, thickness is 157 μ m, the magnetic susceptibility during 13.56MHz is that μ r ' is 144, μ r " be 21, do not have set, peel off easily.
The surface roughness of the molded ferrite sheet that obtains is, be mixed with the ferrite oversize grain, center line average roughness (Ra) is 361nm, maximum height (Rmax) is 6.2 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 67%.
In addition, the surface roughness of sintered ferrite substrate is, center line average roughness (Ra) is 305nm, and maximum height (Rmax) is 4.0 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 49%.
[embodiment 13]
Except the condition of the molded ferrite sheet that obtains thickness 43 μ m when applying with scraper, the method by similarly to Example 11 obtains sintered ferrite substrate.
The evaluating characteristics of the sintered ferrite substrate that obtains, the result, thickness is 37 μ m, the magnetic susceptibility during 13.56MHz is that μ r ' is 156, μ r " be 31, do not have set, peel off easily.
The surface roughness of the molded ferrite sheet that obtains is, center line average roughness (Ra) is 345nm, maximum height (Rmax) is 4.0 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 23%.
In addition, the surface roughness of sintered ferrite substrate is, center line average roughness (Ra) is 289nm, and maximum height (Rmax) is 3.1 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 12%.
[embodiment 14]
Except the condition of the molded ferrite sheet that obtains thickness 377 μ m when applying with scraper, the method by similarly to Example 11 obtains sintered ferrite substrate.
The evaluating characteristics of the sintered ferrite substrate that obtains, the result, thickness is 326 μ m, the magnetic susceptibility during 13.56MHz is that μ r ' is 167, μ r " be 50, do not have set, peel off easily.
The surface roughness of the molded ferrite sheet that obtains is, center line average roughness (Ra) is 634nm, maximum height (Rmax) is 7.8 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 66%.
In addition, the surface roughness of sintered ferrite substrate is, center line average roughness (Ra) is 593nm, and maximum height (Rmax) is 7.8 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 39%
[comparative example 9]
Make ferrite resin by method similarly to Example 10 and form mixing thing, use and be processed into center line average roughness (Ra) to be the iron plate clamping constituent of 2 μ m as 120nm, maximal roughness and to form, in addition under same condition, make sintered ferrite substrate.Its result, set is serious, peels off difficulty, though a part can be peeled off, palette ruptures, and fails to produce the tetragonal sintered ferrite substrate of a length of side 80mm.Magnetic susceptibility during the 13.56MHz of sintered ferrite substrate is that μ r ' is 160, μ r " be 48.
The surface roughness of the molded ferrite sheet that obtains is, center line average roughness (Ra) is 98nm, maximum height (Rmax) is 0.9 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 5%.
In addition, the surface roughness of sintered ferrite substrate is, center line average roughness (Ra) is 81nm, and maximum height (Rmax) is 0.8 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 1%.
[comparative example 10]
Make the ferrite dispersion paints by method similarly to Example 11.(center line average roughness (Ra) is 17nm at the PET film that does not carry out sandblast processing, maximum height (Rmax) is 0.3 μ m, thickness is 50 μ m) on, with scraper the coating that obtains is carried out certain thickness coating, drying is 30 minutes in 100 ℃ of hot blasts, obtains the molded ferrite sheet of thickness 217 μ m.
This sheet material is peeled off and overlapping 10 from the PET film, carried out identical with embodiment 10 fire processing, the evaluation of the sintered ferrite substrate that obtains.Thickness is 177 μ m, and set is serious, can not peel off.
The surface roughness of the molded ferrite sheet that obtains is, center line average roughness (Ra) is 78nm, maximum height (Rmax) is 1.8 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 87%.
In addition, the surface roughness of sintered ferrite substrate is, center line average roughness (Ra) is 54nm, and maximum height (Rmax) is 1.3 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 0.2%.
[comparative example 11]
By making after the sheet material with the same method of comparative example 10, from PET film releasing sheet, with molded ferrite sheet face that the face of film contacts on, by brushing coating 50mg average grain diameter is the Zirconium oxide powder (N. E. Chemcat Corp.'s manufacturing) of 5 μ m, carry out afterwards with comparative example 10 same fire processing, the evaluation of the sintered ferrite substrate that obtains.
Magnetic susceptibility during the 13.56MHz of the sintered ferrite substrate that obtains is that μ r ' is 157, μ r " be 31.But, confirm to exist zirconia powder to anchor at the position on sintered ferrite substrate surface, when it is removed with brush, 4 plates fractures in 10.The coating of powder and to remove operation very loaded down with trivial details can not be removed Zirconium oxide powder fully.
[comparative example 12]
Is the iron plate of 14 μ m except using sandblast to be processed into center line average roughness (Ra) as 1200nm, maximum height (Rmax), and the method by similarly to Example 10 obtains sintered ferrite substrate.Do not have set, can not damage plate ground and peel off.
Magnetic susceptibility during the 13.56MHz of the sintered ferrite substrate that obtains is that μ r ' is 78, μ r " be 1, be the value that can not satisfy magnetic characteristic.This is that the result increases in the space on the cross section of sintered ferrite substrate because surface roughness is excessive, thereby magnetic susceptibility reduces.
[comparative example 13]
Make the ferrite dispersion paints by method similarly to Example 11.Carrying out roughness processing, center line average roughness (Ra) is that 252nm, maximum height (Rmax) are on the PET film (Teijin DuPont Films Co., Ltd. makes U4-50) of 3.3 μ m, with scraper the coating that obtains is carried out certain thickness coating, drying is 30 minutes in 100 ℃ of hot blasts, obtains the molded ferrite sheet of thickness 198 μ m.
This sheet material is peeled off and overlapping 10 from the PET film, carried out identical with embodiment 10 fire processing, the evaluation of the sintered ferrite substrate that obtains.
The thickness of the sintered ferrite substrate that obtains is 169 μ m, and set is serious, can not peel off.
The surface roughness of the molded ferrite sheet that obtains is, center line average roughness (Ra) is 246nm, maximum height (Rmax) is 2.6 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 97%.
In addition, the surface roughness of sintered ferrite substrate is, center line average roughness (Ra) is 201nm, and maximum height (Rmax) is 2.1 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 96%.
That is, by this result as can be known, in order to pursue effect of the present invention, be not only surface roughness, the control of the area ratio/occupancy ratio of the plane of disruption is also very important.
Table of induction as a result is shown in table 2.
[table 2]
[embodiment 15]
On the concavo-convex machined surface of the sintered ferrite substrate that obtains by embodiment 10, paste the two-sided tape (goods name 467MP, Sumitomo 3M makes) of thickness 50 μ m, make the laminated body that constitutes by sintered ferrite substrate layer 60 μ m and adhesive linkage 50 μ m.
In order to make this laminated body have bendability, it is loaded on the polyurethane sheet that thickness 10mm, expansion ratio be about 10 times, use the rubber rollers of the about 50mm of profile, the about 15cm of width, respectively to the longitudinal and transverse pressurization of laminated body, in sintered ferrite substrate integral body, the crack is set with the pressure of the about 1kg/cm of roller linear pressure.
Then, stamping-out becomes profile 14mm φ, internal diameter 8mm φ, measures magnetic susceptibility.Magnetic susceptibility is that μ r ' is 121 when 13.56MHz, μ r " be 10.
In addition, above-mentioned laminated body is wound into the iron staff of profile 30mm φ after, cut out and above-mentioned same test film, measure magnetic susceptibility.Consequently μ r ' be 120, μ r " be 10, almost do not change, bendability is good, magnetic susceptibility μ r ' is more than 80, and is also good
[embodiment 16]
The PET film that is produced on 25 μ m is provided with the flat plane antenna of the Vorticose conducting ring of 7 circles.Its annular shape is the rectangle of vertical 45mm, horizontal 75mm.
In addition, use the Mg-Zn-Cu ferrite that uses among the embodiment 10, make the molded ferrite sheet of thickness 185 μ m by method similarly to Example 11, utilize each Thomson cutter of 30 ° of point of a knife of V-type in the shaping sheet surface, the V groove of the about 90 μ m of the degree of depth is set with the clathrate that is spaced apart 2mm.The molded ferrite sheet of the trough of belt that obtains is cut into the quadrangle of length of side 100mm, peel off, under the condition identical, the sheet material that obtains is fired with embodiment 10 from the PET film.
The thickness of the sintered ferrite substrate that obtains is 143 μ m, and overall dimension is the quadrangle of length of side 80mm.On the face that does not have groove of sintered ferrite substrate, be coated in the electrically-conducting paint (trade name Dotite XE-9000, Fujikura Kasei Co., Ltd makes) that is dispersed with silver and copper powders may in the polyester resin, drying is 30 minutes under 50 ℃, and the conductive layer of 30 μ m is set.The sheet resistance of conductive layer is 0.2 Ω/.
The two-sided tape (goods name 467MP, 3M Co., Ltd. in Sumitomo makes) of fitting on this conducting surface afterwards, cuts ferrite sintered substrate by method similarly to Example 15, gives bendability.At this moment, ferritic sheet is the quadrangle of length of side 2mm, is roughly uniform shape.The magnetic susceptibility of this sheet material is that μ r ' is 119, μ r " be 9.0.
The two-sided tape of used thickness 50 μ m (goods name 467MP, 3M Co., Ltd. in Sumitomo makes) is pasted the face that conductive layer is not set of conduction coil antenna and sintered ferrite substrate, makes Anneta module in not interstitial mode on binding face.Because the resonance frequency of this module is 15.5MHz, Q is 67, so the capacitor that is connected in parallel on coil antenna makes the capacitance variations of capacitor, adjusts, and makes that resonance frequency is 13.5～13.6MHz.After adjusting frequency, do not observe the variation of Q.The conductor planes of this Anneta module and the iron plate of thickness 1mm are connected airtight, measure resonance characteristics.Its result, whether iron plate is irrelevant with installing, and does not observe the variation of resonance characteristics.
[embodiment 17]
Making in the Anneta module that obtains by method similarly to Example 16, the conductive layer of sintered ferrite substrate is, coating nickel-acrylic compounds electrically-conducting paint (trade name DotiteFN-101), drying is 30 minutes under 50 ℃, coating thickness is 10 μ m, sheet resistance is 2 Ω/, in addition carries out evaluation similarly to Example 16.Its result, resonance characteristics are resonance frequency 13.6MHz, and Q is 63, and whether iron plate is irrelevant with installing, and does not almost observe variation.
[embodiment 18]
Use is provided with prints lamination conduction silver paste and carries out the sintered ferrite substrate that one is fired the conductive layer of the 10 μ m that form at 900 ℃ on raw cook, in addition, make Anneta module by method similarly to Example 16.The Anneta module that obtains is carried out similarly to Example 16 evaluation.The sheet resistance of conductive layer is 0.1 Ω/, and resonance characteristics is that resonance frequency is that 13.55MHz, Q are 63, and whether iron plate is irrelevant with installing, and does not almost observe variation.
[comparative example 14]
Conductive layer is not set on sintered ferrite substrate, in addition, by method formation Anneta module similarly to Example 16.Resonance frequency when not having lamination iron plate is 13.5MHz, and Q is 66.To the iron plate of its laminated thickness 1mm and measure resonance characteristics, resonance frequency becomes 15.8MHz, to high frequency side skew 2.3MHz similarly to Example 13.Q is 66, and the resonance degree does not change, but because frequency shift (FS), so under 13.56MHz, do not produce resonance, the result, communication intensity significantly reduces.
[comparative example 15]
Adopting the structure same with comparative example 14, is 300 μ m with the thickness setting of sintered ferrite substrate, in addition carries out the evaluation same with comparative example 14.If lamination iron plate, then resonance frequency is 13.9MHz, and to compare frequency change less with comparative example 14, but communication intensity reduces.
[comparative example 16]
In the Anneta module that the method by similarly to Example 16 is made, the thickness that is arranged on the conductive layer on the sintered ferrite substrate is 5 μ m, its sheet resistance is that 5 Ω/ is right, in addition estimates for the resonance characteristics with the Anneta module of spline structure with embodiment 7.Its result, if lamination iron plate, then resonance frequency becomes 15.0MHz, the communication intensity during 13.56MHz also reduces.
More than use embodiment to further describe the present invention, but the regulation of number range of the present invention, certainly be also included within the scope that does not break away from purport of the present invention, use the whole scope dictates of the numerical value of above-mentioned embodiment arbitrarily, should be understood that to be recorded in this specification as critical value.
Claims (18)
1. molded ferrite sheet that thickness is 30 μ m～430 μ m is characterized in that:
In at least one surperficial surface roughness, center line average roughness is 170nm～800nm, and maximum height is 3 μ m～10 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 10～80%.
2. molded ferrite sheet as claimed in claim 1 is characterized in that:
Utilize blasting treatment that asperities processing is carried out on the molded ferrite sheet surface.
3. molded ferrite sheet as claimed in claim 1 is characterized in that:
Utilize Surface Machining to become concavo-convex mould or felt wrapped roll that press molding is carried out on the molded ferrite sheet surface.
4. molded ferrite sheet as claimed in claim 1 is characterized in that:
Under the situation with the sheet material that obtains being shaped, on the plastic film that carries out blasting treatment, apply transfer surface concavo-convex and obtain the shaping sheet material in coating and dry ferrite dispersion paints.
5. molded ferrite sheet as claimed in claim 1 is characterized in that:
Under the situation with the sheet material that obtains being shaped, adjusting average grain diameter is the granularity of the ferrite powder of 0.1～10 μ m, is provided with concavo-convex from the teeth outwards in coating and dry ferrite dispersion paints.
6. molded ferrite sheet as claimed in claim 1 is characterized in that:
Ferrite is Ni-Zn-Cu spinel-like ferrite or Mg-Zn-Cu spinel-like ferrite.
7. sintered ferrite substrate that thickness is 25 μ m～360 μ m is characterized in that:
In at least one surperficial surface roughness, center line average roughness is 150nm～700nm, and maximum height is 2 μ m～9 μ m, and the area ratio/occupancy ratio of the plane of disruption of cutting open at 50% degree of depth place along continuous straight runs of maximum height in the square zone of 100 μ m is 5～70%.
8. sintered ferrite substrate as claimed in claim 7 is characterized in that:
Ferrite is a Ni-Zn-Cu spinel-like ferrite, and the real part μ r ' of the magnetic susceptibility during 13.56MHz is more than 80, the imaginary part μ r of magnetic susceptibility " be below 20.
9. sintered ferrite substrate as claimed in claim 7 is characterized in that:
Ferrite is a Mg-Zn-Cu spinel-like ferrite, and the real part μ r ' of the magnetic susceptibility during 13.56MHz is more than 80, the imaginary part μ r of magnetic susceptibility " be below 100.
10. sintered ferrite substrate as claimed in claim 7 is characterized in that:
The one side of sintered ferrite substrate is provided with conductive layer.
11. sintered ferrite substrate as claimed in claim 7 is characterized in that:
At least the one side of sintered ferrite substrate is provided with groove.
12., it is characterized in that as claim 7 or 8 described sintered ferrite substrates:
Sintered ferrite substrate be pasted with bonding film on the one side at least, and sintered ferrite substrate is provided with the crack.
13. Anneta module, it is the conduction ring-type Anneta module that is used for wireless communication medium and wireless communication medium processing unit, the one side of magnetic part is provided with the conduction coil antenna, and the opposing face of face that is provided with the magnetic part of antenna is provided with conductive layer, it is characterized in that:
Magnetic part is claim 7 or 8 described sintered ferrite substrates.
14. Anneta module as claimed in claim 13 is characterized in that:
The thickness of conductive layer is below the 50 μ m, and sheet resistance is 3 Ω/below the.
15. Anneta module as claimed in claim 13 is characterized in that:
Magnetic part is the ferrite sintered substrate of Ni-Zn-Cu spinel-like, and coating acrylic compounds or epoxies electrically-conducting paint are to be provided with conductive layer.
16. Anneta module as claimed in claim 13 is characterized in that:
Magnetic part is the ferrite sintered substrate of Mg-Zn-Cu spinel-like, and coating acrylic compounds or epoxies electrically-conducting paint are to be provided with conductive layer.
17. Anneta module as claimed in claim 13 is characterized in that:
Magnetic part is the ferrite sintered substrate of Mg-Zn-Cu spinel-like, by utilizing silver paste to print lamination on molded ferrite sheet and one is fired, conductive layer is set.
18. Anneta module as claimed in claim 13 is characterized in that:
Magnetic part is the ferrite sintered substrate of Ni-Zn-Cu spinel-like, by utilizing silver paste to print stacked on molded ferrite sheet and one is fired, conductive layer is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610182890.1A CN105869820B (en) | 2007-03-07 | 2008-03-05 | Molded ferrite sheet, sintered ferrite substrate and Anneta module |
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| JP2007057892 | 2007-03-07 | ||
| JP2007057892 | 2007-03-07 | ||
| JP2007-057892 | 2007-03-07 | ||
| JP2007282576 | 2007-10-31 | ||
| JP2007282576A JP5194717B2 (en) | 2007-10-31 | 2007-10-31 | Ferrite molded sheet, sintered ferrite substrate and antenna module |
| JP2007-282576 | 2007-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310409292.XA Division CN103496960B (en) | 2007-03-07 | 2008-03-05 | Molded ferrite sheet, sintered ferrite substrate and antenna module |
| CN201610182890.1A Division CN105869820B (en) | 2007-03-07 | 2008-03-05 | Molded ferrite sheet, sintered ferrite substrate and Anneta module |
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| Publication Number | Publication Date |
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| CN101262085A true CN101262085A (en) | 2008-09-10 |
| CN101262085B CN101262085B (en) | 2016-04-27 |
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| CN200810096312.1A Active CN101262085B (en) | 2007-03-07 | 2008-03-05 | Molded ferrite sheet, sintered ferrite substrate and Anneta module |
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| CN (1) | CN101262085B (en) |
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| JP5360350B2 (en) | 2013-12-04 |
| CN101262085B (en) | 2016-04-27 |
| JP2008252089A (en) | 2008-10-16 |
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