WO2015178450A1 - フェライト焼結板及びフェライト焼結シート - Google Patents
フェライト焼結板及びフェライト焼結シート Download PDFInfo
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- WO2015178450A1 WO2015178450A1 PCT/JP2015/064593 JP2015064593W WO2015178450A1 WO 2015178450 A1 WO2015178450 A1 WO 2015178450A1 JP 2015064593 W JP2015064593 W JP 2015064593W WO 2015178450 A1 WO2015178450 A1 WO 2015178450A1
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- ferrite sintered
- ferrite
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Definitions
- the present invention provides a ferrite sintered sheet in which an adhesive layer and / or a protective layer is provided on the surface of the ferrite sintered plate and the ferrite sintered plate. More specifically, the present invention provides a shield plate disposed on the back side of a detector of a digitizer system of a mobile terminal.
- Mobile terminals such as smartphones, tablets, and personal computers are equipped with a digitizer system that detects position information on a liquid crystal screen as digital information using a coordinate indicator such as a touch pen.
- This system detects position information using an alternating magnetic field of about 100 kHz to 1 MHz using magnetic coupling between a coordinate indicator and a detector.
- a shield plate is arranged on the back surface of the detector to suppress the influence of an unnecessary magnetic field from the outside.
- Patent Document 1 Technology that uses a ferrite plate or a sheet-like member in which ferrite particles are dispersed in rubber or plastic as the shield plate in order to realize market demands for improved reading sensitivity and positional accuracy, weight reduction, and thinning (Patent Document 1) ), Technology using magnetic thin plate made of permalloy or amorphous metal (Patent Document 2), technology using ferrite, ferrite-containing material, iron carbonyl compact, permalloy compact, Sendust compact (Patent Document 3) Has been.
- the thickness of the shielding material is required to be about several tens of ⁇ m.
- the inductance of the loop antenna used for detecting the magnetic field depends on ⁇ ′ and the thickness of the shield plate, and increases as ⁇ ′ increases and the shield plate increases in thickness. That is, as the product of ⁇ ′ and thickness increases, the reading sensitivity and position accuracy of the position information improve. Therefore, when the shield material is thinned, it is necessary to set not only ⁇ ′ and thickness but also the product of ⁇ ′ and thickness within an appropriate range.
- Patent Document 1 discloses a technique of using a ferrite plate as a shield plate disposed on the back surface of a detector, but does not consider controlling the ferrite thinly.
- a technique using a sheet-like member in which ferrite particles are dispersed in rubber or plastic is also disclosed. Ferrite has a high ⁇ ′ in the bulk state, but the upper limit of ⁇ ′ of the sheet in which the ferrite is dispersed as a particle in a resin or the like is about 20 because there is a nonmagnetic resin between the particles. Therefore, in order to improve reading sensitivity and position accuracy, a higher ⁇ ′ is required.
- Patent Document 2 discloses a technique of using a magnetic thin plate made of permalloy or amorphous metal as the shield plate. Referring to the embodiment, it can be seen that the magnetic permeability ( ⁇ ′′) due to the eddy current increases because the effective magnetic permeability of the magnetic thin plate decreases as the frequency increases. Loss also increases and is not an efficient system.
- Patent Document 3 discloses a technique using iron carbonyl green compact, permalloy green compact, or Sendust green compact as the shield plate.
- ⁇ ′ of the green compact has a gap between magnetic particles.
- about 50 is the upper limit. Therefore, in order to improve reading sensitivity and position accuracy, a higher ⁇ ′ is required.
- the present invention provides a ferrite sintered plate having a high electrical resistivity, a large real part ⁇ ′ and a small imaginary part ⁇ ′′ in order to achieve sufficient reading sensitivity and position accuracy in a digitizer system. It is a technical problem to provide a sintered ferrite sheet.
- the present invention relates to 47 to 50 mol% Fe 2 O 3 , 7.0 to 26 mol% NiO, 13 to 36 mol% ZnO, 7.0 to 12 mol% CuO, 0 to 1.5 mol in terms of oxide.
- % Ferrite a volume resistivity of 1 ⁇ 10 8 to 1 ⁇ 10 12 ⁇ cm, and a thickness of 10 to 60 ⁇ m (Invention 1) ).
- the present invention is the ferrite sintered plate according to the first aspect of the present invention, wherein the real part of the magnetic permeability at 500 kHz is 160 to 1200 and the imaginary part of the magnetic permeability is 0 to 90 (Invention 2).
- the present invention is the ferrite sintered plate according to the present invention 1 or 2, wherein the product of the real part of the magnetic permeability at 500 kHz of the ferrite sintered plate and the thickness of the ferrite sintered plate is 7500 to 72000 (the present invention). 3).
- the present invention is the ferrite sintered plate according to any one of the present inventions 1 to 3, wherein at least one groove is formed on at least one surface (invention 4).
- the present invention is a ferrite sintered sheet in which an adhesive layer or a protective layer is provided on at least one surface of the ferrite sintered plate according to any one of the present inventions 1 to 4 (Invention 5).
- the present invention is a ferrite sintered sheet in which an adhesive layer is provided on one surface of the ferrite sintered plate according to any one of the present inventions 1 to 4 and a protective layer is provided on the opposite surface (the present invention). 6).
- the present invention is a ferrite sintered sheet in which an adhesive layer is provided on both surfaces of the ferrite sintered plate according to any one of the present inventions 1 to 4 (Invention 7).
- the present invention is a ferrite sintered sheet in which protective layers are provided on both surfaces of the ferrite sintered plate according to any one of the present inventions 1 to 4 (Invention 8).
- the present invention is the ferrite sintered sheet according to any one of the present inventions 5 to 8, wherein the ferrite sintered plate is divided into small pieces (Invention 9).
- the real part of the permeability at 500 kHz is 120 to 800
- the imaginary part of the permeability is 0 to 30
- the product of the real part of the permeability at 500 kHz and the thickness of the ferrite sintered plate is The ferrite sintered sheet according to the ninth aspect of the present invention, which is 5000 to 48,000 (the present invention 10).
- the present invention has a volume resistivity of 1 ⁇ 10 8 to 1 ⁇ 10 12 ⁇ cm, a thickness of 10 to 60 ⁇ m, a real part of permeability at 500 kHz of 160 to 1200, and an imaginary number of permeability.
- a ferrite sintered plate having a part of 0 to 90 (Invention 11).
- the present invention also provides a ferrite sintered sheet in which an adhesive layer or a protective layer is provided on at least one surface of a ferrite sintered plate having a volume resistivity of 1 ⁇ 10 8 to 1 ⁇ 10 12 ⁇ cm, A sintered sintered sheet in which the sintered plate is divided into small pieces, and the ferrite sintered sheet has a real part of permeability of 120 to 800 at 500 kHz and an imaginary part of permeability of 0 to 30. (Invention 12).
- the present invention also provides a digitizer system comprising a detector and a shield plate disposed adjacent to the detector, wherein the shield plate is formed from the ferrite sintered plate according to any one of the present inventions 1 to 4 and 11.
- This is a digitizer system (Invention 13).
- the present invention also provides a digitizer system comprising a detector and a shield plate disposed adjacent to the detector, wherein the shield plate is made of the ferrite sintered sheet according to any one of the present inventions 5 to 10 and 12.
- This is a digitizer system characterized in that (present invention 14).
- the ferrite sintered plate and ferrite sintered sheet according to the present invention are suitable as a shield plate for improving the reading sensitivity and position accuracy of the digitizer system because of its high electrical resistivity, large ⁇ ′ and small ⁇ ′′.
- the volume resistivity of the sintered ferrite plate according to the present invention is 1 ⁇ 10 8 to 1 ⁇ 10 12 ⁇ cm.
- the upper limit of the volume resistivity is 1 ⁇ 10 12 ⁇ cm as an original characteristic of the material according to the present invention.
- a more preferable volume resistivity is 2 ⁇ 10 8 to 1 ⁇ 10 12 ⁇ cm.
- the composition of the sintered ferrite plate according to the present invention is 47 to 50 mol% Fe 2 O 3 , 7 to 26 mol% NiO, 13 to 36 mol% ZnO, 7 to 12 mol% CuO, 0 to 1 in terms of oxide. .5 mol% CoO, and the total amount is 100 mol%. However, it may contain a trace amount of impurities that are inevitably mixed from the raw materials and the manufacturing process.
- composition of Fe 2 O 3 in the sintered ferrite plate according to the present invention is less than 47 mol%, ⁇ ′ becomes small. When it exceeds 50 mol%, sintering at a low temperature cannot be performed. A more preferable composition of Fe 2 O 3 is 47 to 49.5 mol%.
- composition of NiO in the ferrite sintered plate according to the present invention is less than 7 mol%, ⁇ ′′ increases. When it exceeds 26 mol%, ⁇ ′ decreases.
- a more preferable composition of NiO is 7.5 to It is 26.0 mol%.
- ⁇ ′ becomes small.
- ⁇ ′′ increases.
- a more preferable composition of ZnO is 14.0 to 35.5 mol%.
- composition of CuO in the ferrite sintered plate according to the present invention is less than 7 mol%, sintering cannot be performed. If it exceeds 12 mol%, ⁇ ′ will be small and the volume resistivity will be less than 1 ⁇ 10 8 ⁇ cm, so the eddy current loss will be large. The overall loss will also increase.
- a more preferable composition of CuO is 7.5 to 11.5 mol%.
- CoO in the sintered ferrite plate according to the present invention is contained when it is necessary to make ⁇ ′′ smaller. If the composition exceeds 1.5 mol%, the temperature change of ⁇ ′ increases, which is not preferable.
- the thickness of the ferrite sintered plate according to the present invention is 10 to 60 ⁇ m. Ferrite sintered plates having a thickness of less than 10 ⁇ m are difficult to produce industrially. If it exceeds 60 ⁇ m, it does not meet the demand for thinning the film, and the weight increases, so it does not meet the demand for weight reduction.
- the real part ⁇ ′ of the magnetic permeability at 500 kHz of the sintered ferrite plate according to the present invention is preferably 160 to 1200.
- the real part ⁇ ′ of the permeability is less than 160, the reading sensitivity and the position accuracy are lowered.
- the real part ⁇ ′ of the magnetic permeability exceeds 1200, the imaginary part ⁇ ′′ becomes large and the loss of the digitizer system becomes large.
- the more preferable real part ⁇ ′ of the magnetic permeability is 170 to 1200. Ferrite to be performed if necessary.
- ⁇ ′ is about 50 to 80% before the processing. Therefore, if ⁇ ′ of the ferrite sintered plate and the unsintered ferrite sintered sheet is in the range of 160 to 1200, A division-processed ferrite sintered sheet having ⁇ ′ of 120 to 800 can be obtained.
- the imaginary part ⁇ ′′ of the magnetic permeability at 500 kHz of the sintered ferrite plate according to the present invention is preferably 0 to 90.
- the lower limit of the imaginary part of the magnetic permeability is 0 as the intrinsic property of the material according to the present invention.
- the more preferable imaginary part ⁇ ′′ of the magnetic permeability is 0 to 80. Since ⁇ ′′ is reduced as compared with that before the processing by dividing the sintered ferrite plate if necessary, the sintered ferrite plate and the non-divided ferrite sintered portion are treated.
- ⁇ ′′ of the bonded sheet is in the range of 0 to 90, a divided sintered ferrite sheet having ⁇ ′′ of 0 to 30 can be obtained.
- the product ( ⁇ m) of the real part ⁇ ′ of the magnetic permeability and the thickness ( ⁇ m) of the ferrite sintered plate is preferably 7500 to 72000.
- the product of the real part of the magnetic permeability and the thickness of the ferrite sintered plate is 72000 from the upper limit of the real part of the magnetic permeability and the upper limit of the thickness of the ferrite sintered plate.
- ⁇ ′ is reduced by the division treatment, if the product of the real part of the permeability and the thickness of the ferrite sintered plate in the ferrite sintered plate and the ferrite sintered sheet not subjected to the division treatment is set in the range of 7500 to 72000. In addition, it is possible to obtain a divided sintered ferrite sheet in which the product of the real part of the magnetic permeability and the thickness of the ferrite sintered plate is 5000 to 48000.
- the ferrite sintered sheet according to the present invention has an adhesive layer or a protective layer provided on at least one surface of the ferrite sintered plate.
- a double-sided adhesive tape can be mentioned. It does not restrict
- the thickness of the pressure-sensitive adhesive layer is preferably 3 to 10 ⁇ m according to the demand for a thin shield material.
- the protective layer in the present invention can enhance the reliability and durability against powder falling when the ferrite sintered plate is divided by providing this.
- the protective layer is not particularly limited as long as it is a resin that extends without breaking when the ferrite sintered sheet is bent, and examples thereof include a PET film, a polyimide film, and a paint containing a resin.
- a protective layer you may laminate
- two or more protective layers are provided and the protective layer is not damaged in the manufacturing process and the processing step of the ferrite sintered sheet, and dirt, tears, etc.
- the thickness of the protective layer is preferably 3 to 10 ⁇ m in accordance with the demand for a thinner shielding material.
- the real part ⁇ ′ of the magnetic permeability at 500 kHz the imaginary part ⁇ ′ of the magnetic permeability, the real part ⁇ ′ of the magnetic permeability and the thickness of the ferrite sintered plate ( ⁇ m)
- the thickness of the ferrite sintered plate ⁇ m
- Each numerical value of the product ( ⁇ m) with the above has characteristics similar to those of the sintered ferrite plate according to the present invention.
- the ferrite sintered plate can be divided starting from at least one groove provided on at least one surface of the ferrite sintered plate in advance. May be configured.
- the groove may be continuous or intermittently formed, and can be substituted for the groove by forming a large number of minute recesses.
- the cross section of the groove is not particularly limited, but is preferably U-shaped or V-shaped.
- the ferrite sintered sheet according to the present invention is preferably divided into small pieces in advance so that the sintered ferrite sheet adheres to a bent portion and is attached and prevents cracking during use.
- the ferrite sintered plate is divided in advance from at least one groove provided on at least one surface of the ferrite sintered plate, or the ferrite sintered plate is divided into small pieces without forming a groove. Either method may be used.
- the ferrite sintered plate is divided into triangles, quadrilaterals, polygons or combinations thereof of any size by grooves.
- the length of one side of a triangle, quadrilateral, or polygon is usually 1 to 12 mm, and when the adhesion surface of the adherend is a curved surface, it is preferably 1 mm or more and 1/3 or less of the radius of curvature thereof, More preferably, it is 1 mm or more and 1/4 or less.
- the ferrite sintered plate may be divided into irregular shapes without being divided by the grooves.
- the width of the opening of the groove formed in the ferrite sintered plate is usually preferably 250 ⁇ m or less, more preferably 1 to 150 ⁇ m. When the width of the opening exceeds 250 ⁇ m, the decrease in the magnetic permeability of the ferrite sintered plate becomes large, which is not preferable.
- the depth of the groove is preferably 1/20 to 1/4 of the thickness of the ferrite sintered plate, more preferably 1/20 to 1/6.
- the real part ⁇ ′ of the magnetic permeability at 500 kHz of the divided sintered ferrite sheet according to the present invention is preferably 120 to 800.
- the real part ⁇ ′ of the magnetic permeability is less than 120, the reading sensitivity and the position accuracy are lowered.
- the real part ⁇ ′ of the magnetic permeability exceeds 800, the imaginary part ⁇ ′′ increases, so that the loss of the digitizer system increases.
- the more preferable real part ⁇ ′ of the magnetic permeability is 150 to 700.
- the imaginary part ⁇ ′′ of the magnetic permeability at 500 kHz of the divided sintered ferrite sheet according to the present invention is preferably 0 to 30.
- the lower limit of the imaginary part ⁇ ′′ of the magnetic permeability is 0 as the intrinsic property of the material according to the present invention. It is.
- the imaginary part ⁇ ′′ of the permeability exceeds 30, the loss of the digitizer system becomes large.
- the more preferable imaginary part ⁇ ′′ of the permeability is 0-25.
- the product ( ⁇ m) of the real part ⁇ ′ of the magnetic permeability and the thickness ( ⁇ m) of the sintered ferrite plate is preferably 5000 to 48000.
- the product of the real part of the magnetic permeability and the thickness of the ferrite sintered plate is 48000 from the upper limit of the real part of the magnetic permeability and the upper limit of the thickness of the ferrite sintered plate.
- ferrite powder is a raw material mixture obtained by mixing raw materials such as oxides, carbonates, hydroxides, and oxalates of each element constituting ferrite in a predetermined composition ratio, or each in an aqueous solution.
- the precipitate obtained by precipitating the elements can be obtained by calcination in the air at a temperature range of 700 to 900 ° C. for 1 to 20 hours and then pulverizing.
- ferrite plate After mixing the obtained ferrite powder and binder resin, ferrite plate is formed by powder compression molding method, injection molding method, calendering method, extrusion method, etc., degreased as necessary, then sintered to ferrite Sintered plates can be manufactured. Also, after mixing ferrite powder, binder resin and solvent, apply a film or sheet with a doctor blade etc. to obtain a green sheet, degrease if necessary, then sinter the obtained green sheet It can be processed to produce a sintered ferrite plate. In addition, after laminating
- the grooves can be formed during the formation of the ferrite plate, after the forming or after the sintering treatment.
- the grooves can be formed during the formation of the ferrite plate, after the forming or after the sintering treatment.
- the sintering treatment For example, when molding by powder compression molding method or injection molding method, it is preferable to form during molding, and when molding by calendar method or extrusion method, it is preferable to form after molding and before sintering, When manufacturing a sintered ferrite board via a sheet
- Degreasing treatment is usually performed at a temperature of 150 to 500 ° C.
- the sintering temperature is usually 850 to 970 ° C., preferably 870 to 960 ° C.
- the sintering time is usually 30 to 180 minutes, preferably 30 to 120 minutes.
- the sintering temperature is less than 850 ° C., it becomes difficult to sinter the particles, the strength of the obtained sintered ferrite plate is not sufficient, and ⁇ ′ is low.
- the sintering temperature is 970 ° C., the particles are sufficiently sintered, so that it is not necessary to increase the temperature beyond 970 ° C.
- the sintering time is less than 30 minutes, it becomes difficult to sinter the particles, the strength of the obtained sintered ferrite plate is not sufficient, and ⁇ ′ is low. Further, if the sintering time is 180 minutes, the sintering of the particles proceeds sufficiently, and it is not necessary to increase the sintering time beyond 180 minutes.
- a ferrite sintered sheet can be obtained by providing an adhesive layer, for example, a double-sided adhesive tape, on the surface of the obtained ferrite sintered plate.
- the adhesive layer can be formed on one side or both sides of the ferrite sintered plate.
- a ferrite sintered sheet can be obtained by providing a protective layer on the surface of the obtained ferrite sintered plate.
- the protective layer can be formed on one side or both sides of the ferrite sintered plate.
- the protective layer is formed by adhering a resin film or sheet constituting the protective layer to the surface of the ferrite sintered plate, if necessary, via an adhesive, or by applying a paint containing the resin constituting the protective layer. This is done by applying to the surface of the ferrite sintered plate.
- powder fall of the ferrite sintered plate can be prevented.
- a ferrite sintered sheet can be obtained by forming an adhesive layer on one surface of a ferrite sintered plate and forming a protective layer on the other surface.
- the sintered ferrite sheet on which the adhesive layer and / or protective layer is formed may be divided by a roller or the like.
- a shield plate made of the ferrite sintered plate or ferrite sintered sheet of the present invention is disposed on the back surface of the detector.
- a coordinate indicator is combined to function as a digitizer system.
- a shield plate may be disposed in contact with the back surface of the detector, and may be disposed at an interval or through another layer to the extent that it does not affect the miniaturization of the system.
- the ferrite sintered plate and the ferrite sintered sheet according to the present invention have a high volume resistivity, so the eddy current loss is small, the real part ⁇ ′ of the magnetic permeability is high, and the magnetic loss. Since the imaginary part ⁇ ′′ is small and the product of the real part ⁇ ′ of the magnetic permeability and the thickness of the sintered ferrite plate is in an appropriate range, when used as a shield plate for a digitizer system, its reading sensitivity and positional accuracy are improved. This is the fact that the loss of the entire detection circuit can be reduced.
- a typical embodiment of the present invention is as follows.
- composition of the ferrite sintered plate was measured using a fluorescent X-ray analyzer 3530 (manufactured by Rigaku Corporation).
- the density of the sintered ferrite plate was calculated from the outer dimensions and weight measured with a caliper and a micrometer.
- the thickness of the ferrite sintered plate and the ferrite sintered sheet was measured with a micrometer.
- the ⁇ ′ and ⁇ ′′ of the divided sintered ferrite sheet were measured at a frequency of 500 kHz using an impedance analyzer 4294A (manufactured by Agilent Technologies) with a ring punched to an outer diameter of 20 mm and an inner diameter of 10 mm.
- ⁇ ′ and ⁇ ′′ are cut by a ring with an outer diameter of 20 mm and an inner diameter of 10 mm using an ultrasonic machine, and impedance analyzer 4294A (manufactured by Agilent Technologies). was measured at a frequency of 500 kHz.
- the volume resistivity of the ferrite sintered plate was measured using a high resistance meter 4339B (manufactured by Agilent Technologies) or a resistance meter 3541 (manufactured by Hioki Electric Co., Ltd.) according to the value.
- Example 1 Each oxide raw material was weighed so that the composition of the ferrite was a predetermined composition, wet mixed using a ball mill for 20 hours, and then the mixed slurry was filtered and dried to obtain a raw material mixed powder. A calcined product obtained by calcining the raw material mixed powder at 730 ° C. for 2 hours was pulverized by a ball mill to obtain a Ni—Zn—Cu ferrite powder according to the present invention.
- Ni—Zn—Cu ferrite powder 100 parts by weight of the obtained Ni—Zn—Cu ferrite powder, 8 parts by weight of polyvinyl butyral as a binder, 3 parts by weight of benzyl-n-butyl phthalate as a plasticizer, and 3 methyl-3methoxy-1-butanol as a solvent 50 After adding the weight part, it mixed well and obtained the slurry. This slurry was applied onto a PET film by a doctor blade type coater to form a coating film, and then dried to obtain a green sheet having a thickness of 43 ⁇ m. A lattice-like groove was formed on one of the surfaces using a blade mold.
- the obtained green sheet was degreased at 400 ° C. and then sintered at 960 ° C. for 2 hours to obtain a ferrite sintered plate.
- the composition of the sintered ferrite plate is 47.1 mol% Fe 2 O 3 , 9.9 mol% NiO, 33.8 mol% ZnO, 9.2 mol% CuO, and the volume resistivity is 3 ⁇ 10. 11 ⁇ cm, thickness was 35 ⁇ m, density was 5.23 g / cm 3 , ⁇ ′ was 849, and ⁇ ′′ was 34. Also, the real part ⁇ ′ of the permeability and the ferrite sintered The product ( ⁇ m) with the thickness of the plate was 29722.
- a PET film having a thickness of 5 ⁇ m was stuck to one surface of the obtained ferrite sintered plate, and a double-sided tape having a thickness of 5 ⁇ m was stuck to the other surface to obtain a ferrite sintered sheet having a thickness of 45 ⁇ m.
- Examples 2-4 In the same manner as in Example 1, a ferrite sintered plate and a ferrite sintered sheet were obtained. Table 1 shows the manufacturing conditions at this time and the characteristics of the obtained ferrite sintered plate and ferrite sintered sheet.
- Comparative Example 1 Each oxide raw material was weighed so that the composition of the ferrite was a predetermined composition, wet mixed using a ball mill for 20 hours, and then the mixed slurry was filtered and dried to obtain a raw material mixed powder. A calcined product obtained by calcining the raw material mixed powder at 1000 ° C. for 2 hours was pulverized by a dry vibration mill to obtain a Ni—Zn—Cu ferrite powder. The composition of the obtained Ni—Zn—Cu ferrite powder was 49.5 mol% for Fe 2 O 3 , 8.3 mol% for NiO, 35.0 mol% for ZnO, and 7.2 mol% for CuO.
- the obtained Ni—Zn—Cu ferrite powder and ethylene-vinyl acetate copolymer were mixed so that the Ni—Zn—Cu ferrite powder was in a proportion of 60 vol%, and kneaded at a temperature of 80 ° C. using a plastmill.
- the obtained kneaded material was molded into a sheet having a thickness of 50 ⁇ m at a temperature of 60 ° C. using a biaxial hot roll.
- the volume resistivity of the obtained sheet was 7 ⁇ 10 10 ⁇ cm, ⁇ ′ at 500 kHz was 16, and ⁇ ′′ was 0.
- the product ( ⁇ m) of ⁇ ′ and the thickness of the sheet was 800.
- Comparative Example 2 In a solution of 20% by weight of a styrene elastomer dissolved in cyclohexanone, the volume ratio after removal of the solvent is a flat iron-aluminum-silicon alloy powder (iron: aluminum: silicon weight ratio is 85: 6: 9, the aspect ratio is 20-30, the average particle size was 40 ⁇ m) was 55 vol%, and the styrene elastomer was 45 vol% and mixed well to obtain a slurry. At that time, ethylcycloexanone was added for viscosity adjustment. This slurry was applied onto a PET film by a doctor blade type coater and dried.
- the obtained coating film was molded under the conditions of a temperature of 130 ° C., a pressure of 90 MPa, and a pressing time of 5 minutes to obtain a flat iron-aluminum-silicon alloy powder-containing sheet having a thickness of 60 ⁇ m.
- the volume resistivity of the obtained sheet was 3 ⁇ 10 5 ⁇ cm, ⁇ ′ at 500 kHz was 110, and ⁇ ′′ was 0.
- the product ( ⁇ m) of ⁇ ′ and the thickness of the sheet was 6600.
- Comparative Example 3 In the same manner as in Example 1, a ferrite sintered plate and a ferrite sintered sheet were obtained. Table 1 shows the manufacturing conditions at this time and the characteristics of the obtained ferrite sintered plate and ferrite sintered sheet.
- the ferrite sintered plate and ferrite sintered sheet according to the present invention have high electrical resistivity, a large real part ⁇ ′ of magnetic permeability, and a small imaginary part ⁇ ′′, thereby improving the reading sensitivity and positional accuracy of the digitizer system. It is suitable as a shield plate.
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Abstract
Description
本発明において最も重要な点は、本発明に係るフェライト焼結板及びフェライト焼結シートは、体積抵抗率が高いので渦電流損失が小さく、透磁率の実数部μ′が高く、磁性損失である虚数部μ″が小さく、透磁率の実数部μ′とフェライト焼成板の厚さとの積が適切な範囲であるので、デジタイザシステムのシールド板として使用した時に、その読み取り感度や位置精度を高めることができ、検出回路全体の損失を小さくすることができるという事実である。
フェライトの組成が、所定の組成になるように各酸化物原料を秤量し、ボールミルを用いて20時間湿式混合を行った後、混合スラリーを濾別・乾燥して原料混合粉末を得た。該原料混合粉末を730℃で2時間焼成して得られた仮焼成物をボールミルで粉砕し、本発明に係るNi-Zn-Cuフェライト粉末を得た。
得られたフェライト焼結板の一方の表面に厚さ5μmのPETフィルムを貼付し、もう一方の表面に厚さ5μmの両面テープを貼付して、厚さ45μmのフェライト焼結シートを得た。
実施例1と同様の方法で、フェライト焼結板及びフェライト焼結シートを得た。このときの製造条件と、得られたフェライト焼結板及びフェライト焼結シートの緒特性を表1に示す。
フェライトの組成が、所定の組成になるように各酸化物原料を秤量し、ボールミルを用いて20時間湿式混合を行った後、混合スラリーを濾別・乾燥して原料混合粉末を得た。該原料混合粉末を1000℃で2時間焼成して得られた仮焼成物を乾式振動ミルで粉砕し、Ni-Zn-Cuフェライト粉末を得た。得られたNi-Zn-Cuフェライト粉末の組成は、Fe2O3が49.5mol%、NiOが8.3mol%、ZnOが35.0mol%、CuOが7.2mol%であった。得られたNi-Zn-Cuフェライト粉末とエチレン-酢酸ビニル共重合体をNi-Zn-Cuフェライト粉末が60vol%の割合になるように混合し、プラストミルを用いて80℃の温度で混練した。得られた混練物を二軸の熱間ロールを用いて60℃の温度で、厚み50μmのシートに成形した。得られたシートの体積抵抗率は、7×1010Ωcm、500kHzにおけるμ′は16、μ″は0であった。μ′と該シートの厚さとの積(μm)は800であった。
シクロヘキサノンにスチレン系エラストマーを20重量%溶解した溶液に、溶剤を除去後の体積比が扁平状鉄-アルミニウム-ケイ素合金粉末(鉄、アルミニウム、ケイ素の重量比が85:6:9、アスペスト比が20~30、平均粒子径が40μm)が55vol%、スチレン系エラストマーが45vol%となるように計量して、十分混合してスラリーを得た。その際、粘度調整の為にエチルシクロエキサノンを添加した。このスラリーをドクターブレード方式コーターによって、PETフィルム上に塗布して乾燥した。得られた塗膜を温度130℃、圧力90MPa、加圧時間5分の条件で成形して、厚み60μmの扁平状鉄-アルミニウム-ケイ素合金粉末含有シートを得た。得られたシートの体積抵抗率は、3×105Ωcm、500kHzにおけるμ′は110、μ″は0であった。μ′と該シートの厚さとの積(μm)は6600であった。
実施例1と同様の方法で、フェライト焼結板及びフェライト焼結シートを得た。このときの製造条件と、得られたフェライト焼結板及びフェライト焼結シートの緒特性を表1に示す。
Claims (14)
- 酸化物換算で47~50mol%のFe2O3、7.0~26mol%のNiO、13~36mol%のZnO、7.0~12mol%のCuO、0~1.5mol%のCoOからなる組成を有し、体積抵抗率が1×108~1×1012Ωcmであり、厚さが10~60μmであることを特徴とするフェライト焼結板。
- 500kHzにおける透磁率の実数部が160~1200であり、透磁率の虚数部が0~90である請求項1記載のフェライト焼結板。
- フェライト焼結板の500kHzにおける透磁率の実数部とフェライト焼結板の厚さとの積(μm)が7500~72000である請求項1又は2記載のフェライト焼結板。
- 少なくとも一方の表面に少なくとも1つの溝が形成されている請求項1~3のいずれかに記載のフェライト焼結板。
- 請求項1~4のいずれかに記載のフェライト焼結板の少なくとも一方の表面に粘着層又は保護層を設けたフェライト焼結シート。
- 請求項1~4のいずれかに記載のフェライト焼結板の一方の表面に粘着層を設け、反対側の表面に保護層を設けたフェライト焼結シート。
- 請求項1~4のいずれかに記載のフェライト焼結板の両面に粘着層を設けたフェライト焼結シート。
- 請求項1~4のいずれかに記載のフェライト焼結板の両面に保護層を設けたフェライト焼結シート。
- フェライト焼結板が小片状に分割されている請求項5~8のいずれかに記載のフェライト焼結シート。
- 500kHzにおける透磁率の実数部が120~800であり、透磁率の虚数部が0~30であり、500kHzにおける透磁率の実数部とフェライト焼結板の厚さとの積が5000~48000である請求項9に記載のフェライト焼結シート。
- 体積抵抗率が1×108~1×1012Ωcmであり、厚さが10~60μmであり、500kHzにおける透磁率の実数部が160~1200であり、透磁率の虚数部が0~90であるフェライト焼結板。
- 体積抵抗率が1×108~1×1012Ωcmであるフェライト焼結板の少なくとも一方の表面に粘着層又は保護層を設けたフェライト焼結シートであって、前記フェライト焼結板が小片状に分割されており、当該フェライト焼結シートの500kHzにおける透磁率の実数部が120~800であり、透磁率の虚数部が0~30であるフェライト焼結シート。
- 検出器と検出器に隣接して配置されるシールド板とから成るデジタイザシステムであって、シールド板が請求項1~4、11のいずれかに記載のフェライト焼結板から成ることを特徴とするデジタイザシステム。
- 検出器と検出器に隣接して配置されるシールド板とから成るデジタイザシステムであって、シールド板が請求項5~10、12のいずれかに記載のフェライト焼結シートから成ることを特徴とするデジタイザシステム。
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CN201580000979.5A CN105308003B (zh) | 2014-05-22 | 2015-05-21 | 铁氧体烧结板和铁氧体烧结片 |
US15/312,288 US10714247B2 (en) | 2014-05-22 | 2015-05-21 | Ferrite sintered plate and ferrite sintered sheet |
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