(12) United States Patent
`Maezawa et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 7,561,114 B2
`Jul. 14, 2009
`
`USOO75611.14B2
`
`(54) ELECTROMAGNETIC INTERFERENCE
`SUPPRESSOR, ANTENNA DEVICE AND
`ELECTRONIC INFORMATION
`TRANSMITTINGAPPARATUS
`
`(75) Inventors: Makoto Maezawa, Yamatokohriyama
`(JP); Takahiko Yoshida,
`Yamatokohriyama (JP); Yoshiharu
`Kiyohara, Yamatokohriyama (JP);
`Shinichi Sato, Yamatokohriyama (JP);
`Haruhide Go, Yamatokohriyama (JP)
`Assignee: Nitta Corporation, Osaka (JP)
`
`(73)
`(*)
`
`Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 68 days.
`11/792,089
`
`Appl. No.:
`
`(21)
`(22)
`(86). PCT No.:
`S371 (c)(1),
`(2), (4) Date:
`(87) PCT Pub. No.: WO2006/059771
`PCT Pub. Date: Jun. 8, 2006
`
`PCT Fled:
`
`Dec. 5, 2005
`
`PCT/UP2005/022320
`
`Jun. 1, 2007
`
`(65)
`
`Prior Publication Data
`US 2007/0252771 A1
`Nov. 1, 2007
`
`Foreign Application Priority Data
`(30)
`(JP)
`............................. 2004-350615
`Dec. 3, 2004
`
`(51) Int. Cl.
`(2006.01)
`H01O 1/52
`(52) U.S. Cl. ....................................... 343/841; 428/447
`
`(58) Field of Classification Search ................. 343/841,
`343/700 MS; 428/447,448, 403, 692.1
`See application file for complete search history.
`References Cited
`
`(56)
`
`U.S. PATENT DOCUMENTS
`
`... 428/294.7
`6,214,454 B1 * 4/2001 Kanda et al. ......
`6,869,683 B2 * 3/2005 Sakurai et al. .............. 428,448
`7,113,123 B2
`9/2006 Saito et al. ..................... 342/1
`7.323,214 B2 *
`1/2008 Wakayama et al. ......... 427,127
`7,390,567 B2 * 6/2008 Matsukawa et al. ......... 428,403
`2006/0214132 A1* 9, 2006 Hirata et al. ............. 252/62.54
`2007/0196671 A1* 8/2007 Kobayashi .................. 428.447
`
`FOREIGN PATENT DOCUMENTS
`
`JP
`JP
`JP
`JP
`JP
`
`O7-212079
`2001-126910
`2002-2991 12
`2002-37.1138
`2003-229694
`
`8, 1995
`5, 2001
`10, 2002
`12/2002
`8, 2003
`
`* cited by examiner
`Primary Examiner Hoang V Nguyen
`(74) Attorney, Agent, or Firm—Clark & Brody
`
`(57)
`
`ABSTRACT
`
`An electromagnetic interference Suppressor of Substantially
`unpressurized sheet form is obtained by applying and drying
`a magnetic paint, and comprises 30 to 80% by volume of soft
`magnetic powder and 20 to 70% by volume of a binder. The
`binder is an elastomer or a resin that a glass transition point
`and/or a softening point is 50° C. or more and a storage
`modulus (E') is 107 Pa (JIS K 7244-1) or more in a state
`containing neither solvent norfiller at room temperature. This
`electromagnetic interference Suppressor exerts a Superior
`electromagnetic interference Suppressing effect.
`
`20 Claims, 14 Drawing Sheets
`
`
`
`C S
`
`a Saraya Vy"
`A.
`
`w
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`
`
`Momentum Dynamics Corporation
`Exhibit 1020
`Page 001
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`

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`U.S. Patent
`
`Jul. 14, 2009
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`Sheet 1 of 14
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`US 7,561,114 B2
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`Fig. 1
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`Momentum Dynamics Corporation
`Exhibit 1020
`Page 002
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`

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`U.S. Patent
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`Jul. 14, 2009
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`Sheet 2 of 14
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`US 7,561,114 B2
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`(a)
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`Momentum Dynamics Corporation
`Exhibit 1020
`Page 003
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`U.S. Patent
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`Jul. 14, 2009
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`Sheet 3 of 14
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`US 7,561,114 B2
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`Momentum Dynamics Corporation
`Exhibit 1020
`Page 004
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`U.S. Patent
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`Jul. 14, 2009
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`Sheet 4 of 14
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`US 7,561,114 B2
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`Fig 6
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`Momentum Dynamics Corporation
`Exhibit 1020
`Page 005
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`U.S. Patent
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`Jul. 14, 2009
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`Sheet 5 of 14
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`US 7,561,114 B2
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`Exhibit 1020
`Page 006
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`U.S. Patent
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`Jul. 14, 2009
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`Sheet 6 of 14
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`US 7,561,114 B2
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`Momentum Dynamics Corporation
`Exhibit 1020
`Page 007
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`U.S. Patent
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`Jul. 14, 2009
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`Sheet 7 of 14
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`US 7,561,114 B2
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`Fig. 9
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`Momentum Dynamics Corporation
`Exhibit 1020
`Page 008
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`U.S. Patent
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`Jul. 14, 2009
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`Sheet 8 of 14
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`US 7,561,114 B2
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`Exhibit 1020
`Page 009
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`

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`U.S. Patent
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`Jul. 14, 2009
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`Sheet 9 of 14
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`US 7.561,114 B2
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`Momentum Dynamics Corporation
`Exhibit 1020
`Page 010
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`

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`U.S. Patent
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`Jul. 14, 2009
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`Sheet 10 of 14
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`US 7,561,114 B2
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`Momentum Dynamics Corporation
`Exhibit 1020
`Page 011
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`

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`U.S. Patent
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`Jul. 14, 2009
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`Sheet 11 of 14
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`US 7,561,114 B2
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`
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`Fig. 13
`Communication Characteristic Z21
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`F- Free Space
`Tag resonance frequency
`r" =25
`Tag resonance frequency. 13.6MHz
`pur' cA5
`Tag resonance frequency 12.3MHz
`pur' =10
`-to Tag resonance frequency 15.7 MHz
`
`Frequency (MH)
`
`25
`ur:Sheet specific magnetic
`permeability
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`Momentum Dynamics Corporation
`Exhibit 1020
`Page 012
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`

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`U.S. Patent
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`Jul. 14, 2009
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`Sheet 12 of 14
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`US 7,561,114 B2
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`Momentum Dynamics Corporation
`Exhibit 1020
`Page 013
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`U.S. Patent
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`Jul. 14, 2009
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`Sheet 13 of 14
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`US 7,561,114 B2
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`Momentum Dynamics Corporation
`Exhibit 1020
`Page 014
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`

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`U.S. Patent
`
`Jul. 14, 2009
`
`Sheet 14 of 14
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`US 7,561,114 B2
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`Fig. 16
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`Momentum Dynamics Corporation
`Exhibit 1020
`Page 015
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`

`

`US 7,561,114 B2
`
`1.
`ELECTROMAGNETIC INTERFERENCE
`SUPPRESSOR, ANTENNA DEVICE AND
`ELECTRONIC INFORMATION
`TRANSMITTINGAPPARATUS
`
`FIELD OF THE INVENTION
`
`The present invention relates to an electromagnetic inter
`ference Suppressor which is used for Suppressing electromag
`netic interference caused by interference of unnecessary elec
`tromagnetic waves inside an electronic apparatus, and more
`particularly relates to an electromagnetic interference Sup
`pressor used for reducing influences from neighboring metal,
`So as to improve radio communications that use frequencies
`(for example, those frequencies of 135 KHZ or less, 13.56
`MHZ or the like) of an electromagnetic induction system in an
`apparatus having a IC tag function referred to as RF-ID (Ra
`dio Frequency Identification), and an antenna device and an
`electronic information transmitting apparatus using Such a
`Suppressor.
`
`10
`
`15
`
`BACKGROUND ART
`
`35
`
`25
`
`30
`
`In recent years, various electronic apparatuses have been
`widely used, and those apparatuses include domestic electric
`appliances such as televisions, computers such as personal
`computers, mobile communication apparatuses such as
`mobile telephones and medical equipment. Unnecessary
`electromagnetic waves released from these electronic appa
`ratuses give influences to other electronic apparatuses to
`cause adverse effects such as malfunction. For this reason, an
`electromagnetic interference Suppressor, which removes or
`shields those unnecessary electromagnetic waves, is used in
`Such electronic apparatuses.
`Here, recently, the above-mentioned electronic appara
`tuses have been rapidly improved to provide high-speed,
`light-weight and thin structures, and miniaturized products,
`so that the packaging density of electronic parts to a circuit
`has become extremely higher. For this reason, along with an 40
`increase in electromagnetic noise caused by electromagnetic
`interference between parts as well as between circuit sub
`strates, there has been a higher possibility of occurrence of
`electromagnetic interference due to unnecessary electromag
`netic waves also between parts as well as between circuit 45
`Substrates within an electronic apparatus.
`Moreover, mobile terminals (for example, mobile tele
`phones, IC cards, and RF-ID systems such as tags) having an
`IC tag function that carries out radio communications by
`using electromagnetic waves centered on a 13.56 MHz band 50
`have been put into a practical use. In one of the applications,
`a receiving-use loop antenna is placed in a housing of a
`Small-size, thin-type mobile telephone, and in this case, when
`a metal housing or the inner face of the housing that has been
`Subjected to a conductivity-applying treatment, such as plat- 55
`ing, for the purpose of electromagnetic wave shielding is
`located closely to the loop antenna, lines of a magnetic force
`of a magnetic field, generated around the loop antenna upon
`transmitting or receiving operation, travel in parallel with the
`metal Surface to generate an eddy current on the metal Surface 60
`to cause losses. Moreover, a magnetic field, generated by the
`eddy current is formed in Such a direction as to cancel the first
`magnetic field (forming an anti-magnetic field), and since the
`resonance frequency is shifted, the magnetic field in the fre
`quency to be used for communications attenuates greatly, 65
`resulting in a phenomenon that shortens the communication
`distance drastically.
`
`2
`One of the countermeasures to communication disturbance
`due to metal located near the loop antenna in radio commu
`nications caused by a magnetic coupling is to place a mag
`netic shield sheet (magnetic sheet) between the loop antenna
`and the housing. With respect to the magnetic shield sheet, for
`example, a sheet has been proposed in which the numeric
`value of the real part (u') of a complex specific magnetic
`permeability is high at 13.56 MHz (which collects magnetic
`fluxes easily) and the numeric value of the imaginary part (u")
`thereof is low (which hardly converts collected magnetic
`fluxes into heat). An electromagnetic interference Suppressor
`which the present invention refers to is used for this magnetic
`shield sheet.
`Patent Document 1 has disclosed that one of the counter
`measures to Suppress electromagnetic interference is to place
`a sheet-state electromagnetic interference Suppressor formed
`by dispersing soft magnetic powder in a binder near an elec
`tronic part or circuit.
`When the electromagnetic interference suppressor of this
`kind is used, a sheet having a high permeability in a range
`from several tens of MHz to several GHZ is required. In order
`to achieve a high permeability, it has been proposed that soft
`magnetic powder having particles of not a spherical shape but
`a flattened shape is used and that the particles of this flattened
`Soft magnetic powder are aligned along the Surface of the
`electromagnetic interference Suppressor sheet (Patent Docu
`ment 2).
`In order to easily achieve Such an alignment, it is preferable
`to use a material having high flowability as a matrix material.
`For example, Patent Document 2 has disclosed a technique in
`which a magnetic paint formed by dissolving flattened soft
`magnetic powder and a polymer binder in an organic solvent
`is applied onto a peeling Support member by using a doctor
`blade method, and dried thereon as a sheet. However, in the
`case when this processing method is used, since upon drying
`the solvent in the magnetic paint generates foam, a problem
`arises in that a large number of pores are formed in the sheet.
`When a large number of pores are generated, the electromag
`netic interference Suppressing effect is lowered drastically.
`Therefore, there have been strong demands for a method
`which can fill the Soft magnetic powder with high density,
`while Suppressing the generation of pores as little as possible.
`On the other hand, Patent Document 3 has disclosed a
`method of producing a composite magnetic material, which
`relates to a method in which a mixed matter, obtained by
`mixing and kneading flattened magnetic powder and a binder,
`is formed into a sheet by a predetermined method, and allows
`the binder to contain a vinyl chloride-based resin having a
`glass transition point of 50° C. or more. In this method,
`however, in order to allow the resulting composite magnetic
`material to have high density, another pressing process is
`required in which the sheet, which has been film-formed and
`from which the solvent has been removed, is pressed by a
`rolling apparatus using a press and rollers.
`Patent Document 1 JP-A No. 7-212079
`Patent Document 2.JP-A No. 2003-229694
`Patent Document 3 JP-A No. 2001-126910
`
`DISCLOSURE OF THE INVENTION
`
`Problems to be Solved by the Invention
`In the post processes (pressure processes) such as a press
`ing process and a calender process, a shearing force is applied
`to the sheet by using a press or the like so that voids inside the
`sheet are discharged, and by accelerating a sufficient flow of
`the binder even into a narrow gap between the filler particles,
`
`Momentum Dynamics Corporation
`Exhibit 1020
`Page 016
`
`

`

`3
`a densely filled state is achieved so that it becomes possible to
`greatly improve the specific gravity of the sheet. These post
`processes are important processes so as to optimally design
`material constants (e", 6", u', u") of the sheet. However, the
`use of the pressing process and the like causes a disadvantage
`in that the production costs increase greatly.
`Therefore, conventionally, there have been strong demands
`for a method which provides a sheet-state electromagnetic
`interference Suppressor having high performances by using
`only the coating process.
`The sheet-state electromagnetic interference Suppressor is
`produced by processes in which: a solution is prepared by
`dissolving a binder in a solvent, and to this is added soft
`magnetic powder, and mixed and stirred therein, and the
`resulting Solution is applied onto a Support member by a
`coating device, and dried thereon. In the above-mentioned
`processes, in order to prepare a state in which no air (Solvent
`traces) remains in the sheet, the following two methods are
`proposed: (a) the amount of air to be contained in the coating
`solution is made smaller; and (b) the amount of air after the
`coating process is made Smaller. With respect to (a), (1) to
`minimize the amount of the solvent upon designing the coat
`ing solution, (2) to prevent foaming at the time of stirring and
`coating (to minimize the initial entrained air) and (3) to carry
`out defoaming immediately before the coating, are proposed.
`With respect to (b), (1) to make the volatilizing speed of the
`Solvent faster than the sheet drying and solidifying speed is
`proposed.
`In the actual production process, in order to increase the
`producing speed, a method is taken in which after the coating
`process and an air-drying process, the resulting sheet is
`immediately made to pass through a heating Zone at a high
`temperature of the boiling point of the solvent or more. As a
`result, the relationship of sheet drying speedd solvent volatil
`izing speed is held, and since a coat film is formed only on the
`surface portion to which heat is first transmitted, the inner air
`(solvent) is not sufficiently discharged to cause pores therein,
`and the resulting problem is that the specific gravity of the
`sheet is not sufficiently raised.
`The object of the present invention is to provide an elec
`tromagnetic interference Suppressor that exerts a Superior
`electromagnetic interference Suppressing effect, with respect
`to a sheet-state electromagnetic Suppressor obtained by
`applying a magnetic paint to be dried thereon. More specifi
`cally, it is to provide such an electromagnetic interference
`Suppressor that is obtained only through a coating process and
`a drying process, without the necessity of post processes Such
`as a pressing process and a calender process, and exerts high
`performances (high specific gravity and the Subsequent opti
`mal real partu' and/or imaginary partu" of a complex specific
`magnetic permeability) that are the same as those obtained by
`using the post processes.
`
`Means for Solving the Problems
`
`The inventors of the present invention have directed their
`attention particularly to the above-mentioned (b) and exam
`ined how to quickly draw air (solvent). As a result, the inven
`tors of the present invention have found that by simply apply
`ing a magnetic paint thereto to be dried thereon, the reduction
`in electromagnetic interference Suppressing effects due to
`influences of pores can be suppressed, and a high density
`apparatus can be obtained; thus, they have achieved to obtain
`an electromagnetic interference Suppressor that is effectively
`used to Suppress electromagnetic disturbance cause by inter
`ference of unnecessary electromagnetic waves.
`
`60
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`65
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`US 7,561,114 B2
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`5
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`4
`That is, the electromagnetic interference Suppressor of the
`present invention is provided with the following structures in
`order to solve the above-mentioned problems:
`(1) The electromagnetic interference Suppressor of Substan
`tially unpressurized sheet form, which is obtained by
`applying and drying a magnetic paint, comprising 30 to
`80% by volume of soft magnetic powder and 20 to 70% by
`Volume of a binder, wherein the binder is an elastomer or a
`resin having a glass transition point and/or a softening
`point of 50° C. or more and having a storage modulus (E')
`of 10 Pa (JIS K 7244-1) or more in a state containing
`neither solvent nor filler at room temperature.
`(2) The electromagnetic interference Suppressor of Substan
`tially unpressurized sheet form, which is obtained by
`applying and drying a magnetic paint, comprising 30 to
`80% by volume of soft magnetic powder and 20 to 70% by
`Volume of a binder, wherein the binder is an elastomer or a
`resin having a glass transition point of room temperature or
`less, with the glass transition point and the Softening point
`being allowed to satisfy the following equation (I), and
`having a storage modulus (E') of 10 Pa (JIS K 7244-1) or
`more in a state containing neither solvent nor filler at room
`temperature.
`Equation 1
`Softening point-Glass transition point245° C.
`(I)
`(3) The electromagnetic interference Suppressor of Substan
`tially unpressurized sheet form, which is obtained by
`applying and drying a magnetic paint, comprising 30 to
`80% by volume of soft magnetic powder and 20 to 70% by
`volume of a binder, wherein the binder comprises 30 to
`80% by weight of an elastomer or a resin having a glass
`transition point of room temperature or more, and 20 to
`70% by weight of an elastomer or a resin having a glass
`transition point of less than room temperature, these glass
`transition points being allowed to satisfy the following
`equation (II), and the elastomer or the resin has a storage
`modulus (E) of 107 Pa (JIS K 7244-1) or more in a state
`containing neither solvent nor filler at room temperature.
`Equation 2
`Tg 1-Tg2220° C.
`Tg1: glass transition point of room temperature or more
`Tg2: glass transition point of less than room temperature
`(4) The electromagnetic interference Suppressor of Substan
`tially unpressurized sheet form, which is obtained by
`applying and drying a magnetic paint, comprising 30 to
`80% by volume of soft magnetic powder and 20 to 70% by
`Volume of a binder, wherein the magnetic paint contains a
`Solvent having a boiling point of (room temperature--40°
`C.) or more, and the binder is an elastomer or a resin having
`a glass transition point and/or a softening point of (room
`temperature--40°C.) or more and having a storage modulus
`(E) of 10 Pa (JIS K 7244-1) or more in a state containing
`neither solvent nor filler at room temperature.
`(5) The electromagnetic interference Suppressor according to
`any of the above-mentioned (1) to (3) in which the drying
`process is a room temperature drying process.
`(6) The electromagnetic interference Suppressor according to
`the above-mentioned (4) in which the drying process is a
`forceful drying process.
`(7) The electromagnetic interference Suppressor according to
`any of the above-mentioned (1) to (4), which has a ratio of
`actual specific gravity/theoretical gravity of 0.5 or more.
`
`(II)
`
`Momentum Dynamics Corporation
`Exhibit 1020
`Page 017
`
`

`

`US 7,561,114 B2
`
`5
`(8) The electromagnetic interference Suppressor according to
`any of the above-mentioned (1) to (4), containing a higher
`fatty acid salt.
`(9) The electromagnetic interference Suppressor according to
`the above mentioned (8) in which the higher fatty acid salt
`is Zinc Stearate.
`(10) The electromagnetic interference Suppressor according
`to any of the above-mentioned (1) to (4) in which the soft
`magnetic powder has a Surface that is treated by a coupling
`agent or coated with a resin.
`(11) The electromagnetic interference Suppressor according
`to any of the claims 1 to 4, having a real part (6') and an
`imaginary part (6") of a complex specific dielectric con
`stant as well as a real part (u') and an imaginary part (u") of
`a complex specific magnetic permeability.
`(12) The electromagnetic interference Suppressor according
`to any of the above-mentioned (1) to (4) in which in a
`frequency to be used in radio communications in an elec
`tromagnetic inductive system, the real part (u') is set to 30
`or more and the imaginary part (u") is set to 6 or less in the
`complex specific magnetic permeability, and the real part
`(e) is set to 30 or more and the imaginary part (e") is set
`to 500 or less in the complex specific dielectric constant.
`(13) The electromagnetic interference Suppressor according
`to any of the above-mentioned (1) to (4) in which in a
`frequency range of 50MHz to 1 GHz, the real part (u') is set
`to 7 or more or the imaginary part (u") is set to 5 or more in
`the complex specific magnetic permeability.
`(14) The electromagnetic interference Suppressor according
`to any of the above-mentioned (1) to (4) wherein a flame
`retarder and/or a flame-retardant auxiliary are contained so
`as to impart a flame resistant property thereto.
`(15) The electromagnetic interference Suppressor according
`to any of the above-mentioned (1) to (4) wherein an adhe
`sion agent layer or a bonding agent layer attached to at least
`one of the surfaces thereof.
`(16) The electromagnetic interference Suppressor according
`to any of the above-mentioned (1) to (4) which has a ther
`mal conductive property.
`(17) A magnetic shield sheet, which is provided with: a con
`40
`ductive reflection layer, and a magnetic layer that is made
`of the electromagnetic interference Suppressor according
`to any of the claims 1 to 4, and attached to at least one of the
`surfaces of the conductive reflection layer, is characterized
`in that a magnetic shield property in a range of 10 MHz to
`1 GHz, obtained by a KEC method or an Advantest
`method, is set to 20 dB or more.
`Here, the elastomer or the resin of the present invention
`may satisfy at least one conditions of the above-mentioned (1)
`to (4), or may simultaneously satisfy two or three or all the
`conditions thereof.
`The antenna device of the present invention is provided
`with: an antenna element having a resonance frequency that is
`matched with a frequency to be used for radio communica
`tions; and the electromagnetic interference Suppressor
`according to any of the above-mentioned (1) to (4), which is
`interposed between the antenna element and a communica
`tion disturbing member. The electronic information transmit
`ting apparatus of the present invention uses the above-men
`tioned antenna device.
`
`6
`simply by applying this thereto to be dried thereon, the reduc
`tion in electromagnetic interference Suppressing effects due
`to influences of pores can be suppressed and a high density
`can be achieved, and that it becomes possible to obtain a
`Superior electromagnetic interference Suppressing effect.
`As described in (14), when the flame resistant property is
`imparted to the electromagnetic interference Suppressor, it
`can be desirably used for applications that require a flame
`resistant. For example, electronic information transmitting
`apparatuses that carry out radio communications by using an
`antenna element, such as tags, readers and mobile telephones,
`Sometimes require a flame resistant property.
`As described in (15), when the adhesion agent layer or the
`bonding agent layer is attached to the Surface of the electro
`magnetic interference Suppressor, it becomes possible to
`paste the electromagnetic interference Suppressor to another
`article, and consequently to easily attach the electromagnetic
`interference Suppressor thereto.
`As described in (16), in the case when a thermal conduc
`tivity is imparted to the electromagnetic interference Suppres
`Sor, for example, even if a communication means, a power
`Supply means or the like, which includes an IC, is used near a
`means that forms a heat generating source, it becomes pos
`sible to restrain a temperature rise in the heat generating
`Source and its periphery, and consequently to prevent a reduc
`tion in performances due to exposure to a high temperature.
`In accordance with the antenna device of the present inven
`tion, even when an antenna element is placed near a member
`(communication disturbing member) having a portion made
`from a conductive material Such as a metal member, the
`antenna element can be desirably used for radio communica
`tions and transmitting operations of electronic information.
`Moreover, in accordance with the electronic information
`transmitting apparatus of the present invention, even when an
`antenna element is placed near a communication disturbing
`member Such as a metal member, it is possible to achieve a
`desirable electronic information transmitting process.
`
`BRIEF DESCRIPTIONS OF THE DRAWINGS
`
`FIGS. 1(a) to 1(d) are cross-sectional views that respec
`tively show one example of a magnetic shield sheet formed by
`using an electromagnetic interference Suppressor of the
`present invention.
`FIG. 2 is a cross-sectional view that shows one example of
`the electromagnetic interference Suppressor of the present
`invention.
`FIGS. 3(a) to 3(c) are drawings that show a structure of a
`tag to be used in the electromagnetic interference Suppressor
`of the present invention.
`FIG.3(a) is a drawing that shows a layout of a loop (coil)
`antenna and an IC chip.
`FIG.3(b) is a cross-sectional view that shows one example
`of a tag construction in which electromagnetic Suppressing
`members are laminated.
`FIG. 3(c) is a cross-sectional view that shows another
`example of a tag construction in which electromagnetic Sup
`pressing members are laminated.
`FIG. 4 is a drawing that exemplifies a magnetic field
`exerted by electromagnetic waves transmitted and received
`from an antenna element.
`FIG.5 is a drawing that shows an example of an application
`of the tag formed by using the electromagnetic interference
`Suppressor of the present invention.
`FIG. 6 is a drawing that shows another example of an
`application of the tag formed by using the electromagnetic
`interference Suppressor of the present invention.
`
`10
`
`15
`
`25
`
`30
`
`35
`
`45
`
`50
`
`55
`
`60
`
`Effects of the Invention
`
`In accordance with the electromagnetic interference Sup
`pressor described in any of the above-mentioned (1) to (4),
`since an elastomer or a resin having predetermined glass
`transition point and softening point is used as the binder,
`
`65
`
`Momentum Dynamics Corporation
`Exhibit 1020
`Page 018
`
`

`

`US 7,561,114 B2
`
`7
`FIG. 7 is a drawing that shows the results of measurements
`on storage modulus (E') of resin.
`FIG. 8 is a drawing that shows the results of measurements
`on tan Ö of the resin.
`FIG. 9 is a schematic drawing that shows a shape of a
`microStrip line used for measurements on transmission loss in
`an Example.
`FIG. 10 is a drawing that shows constants of blended mate
`rials of Example 11.
`FIG. 11 is a cross-sectional view that schematically shows
`a FeliCa reader/writer evaluation kit used in Example 11.
`FIG. 12 is a graph that shows the results of evaluation made
`on the communication distance of a tag formed by using an
`electromagnetic interference Suppressor of Example 11.
`FIG. 13 is a drawing that shows the results of simulation
`indicating the position of resonance frequency and the calcu
`lation conditions thereof in the tag formed by using the elec
`tromagnetic interference Suppressor of Example 11.
`FIG. 14 is a drawing that shows constants of blended mate
`rials of Example 12.
`FIG. 15 is a graph that shows a magnetic field shielding
`property of an electromagnetic interference Suppressor (mag
`netic shield sheet) in Example 13.
`FIG. 16 is a graph that shows material constants in
`Example 14.
`
`DESCRIPTION OF REFERENCE NUMERALS
`
`1 Conductive reflection layer
`2 Electromagnetic interference Suppressor
`3 Pasting layer
`4 Antenna element
`5 IC chip
`6 Substrate
`7 Electromagnetic interference Suppressor
`8 Communication disturbing member
`12 Communication disturbing member
`15 Tag
`23 Electronic device
`30 Tag
`43 Communication disturbing member
`44 Electromagnetic interference Suppressor
`54 Electromagnetic interference Suppressing sheet
`
`PREFERRED EMBODIMENTS OF THE
`INVENTION
`
`8
`granular films may be used. With respect to the Fe pure ferrite
`particles, for example, carbonyl iron powder may be used.
`With respect to the shape of the soft magnetic powder (spheri
`cal shape, flattened shape, fiber shape and the like), although
`not particularly limited, soft magnetic powder having a flat
`tened shape with high permeability is preferably used. How
`ever, those having a flattened shape have difficulty in remov
`ing air (solvent) inside the sheet, and tend to fail to increase
`the specific gravity. These magnetic materials may be used as
`a simple Substance, or a plurality of them may be blended and
`used. The average particle size of the soft magnetic powder or
`the major diameter of the flattened shaped soft magnetic
`powder is preferably set in a range from 1 to 300 um, prefer
`ably, from 20 to 100 Lum. Moreover, the aspect ratio of the soft
`magnetic powder having a flattened shape is preferably set in
`a range from 2 to 500, preferably, from 10 to 100. Here, the
`above-mentioned average particle size is a value obtained
`through measurements by a particle size distribution measur
`ing device.
`The surface of the soft magnetic powder is preferably sub
`jected to a coupling agent treatment or a resin coating treat
`ment. With this arrangement, the affinity to a binder, which
`will be described later, is improved. With respect to the cou
`pling agent, examples thereof include: silane coupling agent,
`titanium-based coupling agent, aluminate-based coupling
`agent, amino-based coupling agent and cation-based cou
`pling agent, and the amount of addition is preferably set to
`about 0.01 to 5% by weight to the soft magnetic powder.
`Moreover, with respect to the resin to be resin-coated, the
`same resin as the binder to be used or an elastomer, a resin or
`the like that is superior in affinity to the binder to be used is
`preferably used. With respect to this elastomer or resin, the
`same resin as those exemplified as the binder, which will be
`described later, may be used. The coating amount of the resin
`is preferably set to about 0.01 to 10% by weight to the soft
`magnetic powder. Moreover, in addition to the coupling agent
`treatment and the resin coating treatment, the soft magnetic
`powder may be surface-treated by other additives and the like.
`In this case, the amount of treatment is preferably set to about
`0.01 to 10% by weight with respect to the soft magnetic
`powder.
`With respect to the binder of the present invention, an
`elastomer or a resin may be used, and with respect to the
`elastomer, examples thereof include various elastomers (in
`cluding thermoplastic elastomers). Such as polyvinyl chlo
`ride-based elastomers, like polyethylene chloride, polysty
`rene-based,
`polyolefin-based,
`polyurethane-based,
`polyester-based, polyamide-based, fluorine-based and sili
`cone-based elastomers.
`With respect to the resin, examples thereof include: ther
`moplastic resins or thermosetting resins, such as polyester
`based urethane resins (adipate-based, carbonate-based, and
`caprolactam ester-based resins), polyether-based urethane
`resin, polyvinyl acetal resin, polyethylene, polypropylene,
`AS resins, ABS resins, polystyrene, polyvinyl chloride, poly
`vinylidene chloride, polyvinyl acetate, ethylene-vinyl acetate
`copolymer, fluororesins, acryl-based resins, nylon, polycar
`bonate, polyethylene terephthalate, alkyd resins, unsaturated
`polyester, polysulfone, polyurethane resin (all the types
`except for those of the above-mentioned, except for those of
`polyester-based and polyether-based), phenolic resins, urea
`resins, epoxy resins, silicone resins, melamine resins, acrylic
`resins, acryl-based copolymer-based resins and alkyl acrylic
`based resins. One of these elastomers or resins may be used