WO2013115616A1 - 디지타이저용 자기장 차폐시트 및 그의 제조방법과 이를 이용한 휴대 단말기기 - Google Patents
디지타이저용 자기장 차폐시트 및 그의 제조방법과 이를 이용한 휴대 단말기기 Download PDFInfo
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- WO2013115616A1 WO2013115616A1 PCT/KR2013/000870 KR2013000870W WO2013115616A1 WO 2013115616 A1 WO2013115616 A1 WO 2013115616A1 KR 2013000870 W KR2013000870 W KR 2013000870W WO 2013115616 A1 WO2013115616 A1 WO 2013115616A1
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- sheet
- magnetic
- ribbon
- magnetic field
- digitizer
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/18—Packaging or power distribution
- G06F1/181—Enclosures
- G06F1/182—Enclosures with special features, e.g. for use in industrial environments; grounding or shielding against radio frequency interference [RFI] or electromagnetical interference [EMI]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
- G06F1/1684—Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F10/00—Thin magnetic films, e.g. of one-domain structure
- H01F10/08—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0075—Magnetic shielding materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y25/00—Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S977/00—Nanotechnology
- Y10S977/70—Nanostructure
- Y10S977/832—Nanostructure having specified property, e.g. lattice-constant, thermal expansion coefficient
- Y10S977/838—Magnetic property of nanomaterial
Definitions
- the present invention relates to a magnetic field shielding sheet for a digitizer, a method for manufacturing the same, and a portable terminal device using the same.
- the magnetic field generated from various components of the main body of the portable terminal device when minimizing the effect on the geomagnetic sensor is implemented.
- the present invention relates to a magnetic field shielding sheet for a digitizer capable of shielding and improving the sensitivity of an electronic pen, a manufacturing method thereof, and a portable terminal device using the same.
- the digitizer using the electronic pen can draw a line of about 0.7mm thick, so it can be easily made finer than the capacitive touch panel recognized as 3-4mm thick.
- the digitizer function is provided with a digitizer panel on the lower side of the touch screen / display panel.
- the digitizer panel is a thin metal film, and when electricity is applied thereto, a thin electromagnetic field is created, and an ultra-small metal coil is embedded at the end of the portable electronic pen. AC magnetic field is generated during use.
- the digitizer panel disposed below the touch screen / display panel generates deformation in the electromagnetic field, which is detected by a sensor disposed at one edge of the electronic panel. It is interpreted as the movement of the electronic pen.
- the digitizer function is applied to not only a small portable terminal such as a smart phone but also a large-screen tablet PC employing a large display.
- a magnetic field shielding sheet for shielding electromagnetic fields generated from various components of the main body of the portable terminal device is inserted between the digitizer panel and the main circuit board.
- the main body of the portable terminal device generates various electromagnetic fields for wireless communication using various communication chips and antennas.
- LTE Long Term Evolution
- 3G mobile communication terminals excluding those affecting the digitizer from such strong electromagnetic fields.
- Reliable magnetic field shielding is required for smooth magnetic field communication between the electronic pen and the digitizer.
- the portable terminal device is equipped with a geomagnetic sensor to implement a function such as navigation or augmented reality using GPS (Global Positioning System) technology.
- GPS Global Positioning System
- the adoption of a geomagnetic sensor is mandatory.
- the magnetic shielding sheet is used in a size corresponding to a digitizer, that is, a display so as not to affect the function of the digitizer, it is difficult to design a gap between the magnetic shielding sheet and the geomagnetic sensor within 2 mm or more inside the mobile terminal.
- the magnetic shielding sheet and the geomagnetic sensor are in close proximity and used together in a portable terminal, the magnetic shielding sheet may affect the geomagnetic sensor and cause a malfunction of the geomagnetic sensor.
- the geomagnetic sensor may generate azimuth distortion, sensor sensitivity distortion, and magnetic hysteresis distortion by the magnetic shielding sheet.
- the azimuth distortion refers to a phenomenon of distorting the direction of magnetic north by the magnetic shielding sheet, and the sensor sensitivity distortion also changes the strength of the magnetic field by the magnetic shielding sheet.
- the sensitivity of the liver is also distorted.
- the magnetic hysteresis distortion is a phenomenon in which an error occurs in the azimuth angle according to the direction of rotation of the sensor due to the magnetic hysteresis of the magnetic material.
- the magnetic shielding sheet it is common to use a magnetic material such as a heat-treated Fe-based and Co-based amorphous ribbon, a ferrite sheet, or a polymer sheet containing magnetic powder.
- a magnetic material such as a heat-treated Fe-based and Co-based amorphous ribbon, a ferrite sheet, or a polymer sheet containing magnetic powder.
- the magnetic field focusing effect for improving magnetic field shielding and digitizer function performance is as follows: Fe-based and Co-based amorphous ribbons with high magnetic permeability, ferrite sheets, and polymer sheets containing magnetic powder.
- the ribbon itself is a metal thin plate, so there is no burden on thickness, but because the magnetic permeability is too high, it affects the geomagnetic sensor and cannot be used as a magnetic field shielding sheet. Permeability is too large to affect geomagnetic sensors, and there are also disadvantages of being thick.
- the polymer sheet has a lower magnetic permeability than the Fe-based and Co-based amorphous ribbons, and in order to improve the performance of the low magnetic permeability, the thickness is thicker than that of the Fe-based and Co-based ribbons, which are tens of um thick. There is a part that is difficult to respond to the trend of thinning terminal, and there is a problem that the material cost further increases as the thickness increases.
- magnetic hysteresis is a phenomenon in which magnetic induction values inside a magnetic body do not coincide with each other and have a hysteresis when the magnetic field is repeatedly applied to the magnetic body repeatedly increasing and decreasing. The phenomenon occurs when the magnetic field is applied until the magnetic body is saturated. If the magnetic field does not reach the saturation region, the magnetic induction value increases and decreases without history along the initial magnetization curve.
- the magnetic hysteresis loop shows a saturation field (Hs) value of about 0.4 G, which is a minimum magnetic field for obtaining saturation induction. Has a lower value than the Earth's magnetic field.
- the Fe-based amorphous ribbon sheet exhibits hysteresis even when the earth magnetic field changes.
- the geomagnetic sensor used in the terminal to which the Fe-based amorphous ribbon sheet is applied must be corrected up to the magnetic hysteresis phenomenon by the Fe-based amorphous ribbon sheet. It has a fatal drawback.
- the geomagnetic sensor in the case of using the Fe-based and Co-based amorphous ribbon sheets, the geomagnetic sensor generates an azimuth history according to the rotational direction of the X, Y, and Z-axis sensing values when the clockwise and counterclockwise rotations are performed. Since the hysteresis cannot be corrected, it adds errors to the sensor operation.
- Korean Patent Publication No. 10-2011-92833 proposes an electromagnetic wave absorption sheet containing Fe-based nanocrystalline soft magnetic powder and carbon-based conductor powder, the Fe-based nanocrystalline soft magnetic powder is an amorphous alloy, Fe-Si-B-Nb-Cu-based alloy is used, and the alloy is preheated at a temperature of 350 ° C to 500 ° C for 45 minutes to 90 minutes to crush the powder first and second to obtain particles of the crushed powder.
- Fe-based nanocrystalline soft magnetic powder having nano-sized grains sieved to have a size of 270 mesh or less is used.
- the electromagnetic wave absorption sheet is 0.5 mm thick and absorbs electromagnetic waves in the 10 MHz to 10 GHz band.
- the electromagnetic wave absorbing sheet is a kind of polymer sheet manufactured by mixing a Fe-based nanocrystalline soft magnetic powder having a nano-sized grain with a binder to a thickness of 0.5 mm as well as for a high frequency and using an amorphous ribbon sheet (thickness). Compared to about 0.06 mm or so), the thickness is thick, and as the binder is mixed, the permeability of the sheet is low.
- Korean Unexamined Patent Publication No. 10-2005-37015 includes 10 to 80 wt% of one or more of Permalloy, Sendust and Quick Set alloys, which are metal alloys having a high permeability, in the form of powder, flake or fiber.
- a metal having a low frequency magnetic field shielding function comprising 15 to 65 wt% of a soft polymer material as a matrix in which the metal alloy is dispersed, and 5 to 25% of various additives used to mix the metal alloy and the soft polymer material.
- polymer composites are 10 to 80 wt% of one or more of Permalloy, Sendust and Quick Set alloys, which are metal alloys having a high permeability, in the form of powder, flake or fiber.
- a metal having a low frequency magnetic field shielding function comprising 15 to 65 wt% of a soft polymer material as a matrix in which the metal alloy is dispersed, and 5 to 25% of various additives used to mix the metal alloy and the soft polymer material
- the permalloy may have a magnetic field of 300 to 600 gauss and a temperature of 600 to 1100 ° C.
- the senddust may have a magnetic field of 100 to 600 gauss and a temperature of 500 to 1100 ° C.
- the rapid solidification alloy may have a magnetic field of 100 to 600 gauss.
- magnetic field heat treatment at a temperature of 300 to 500 ° C. for 1 to 2 hours, respectively.
- the metal and polymer composite includes any one of a metal alloy and a polymer material in powder, flake or fiber form, and has the same problem as the polymer sheet.
- the prior art relates to an electromagnetic wave absorbing sheet or a magnetic shielding sheet, and when the electronic pen and the navigation function are implemented together in a portable terminal such as a smartphone, the conventional magnetic shielding sheet may have a distortion problem or a thickness with respect to the geomagnetic sensor. There is no solution to the problem of thick and very expensive materials.
- the present inventors can correct the azimuth distortion and sensor sensitivity distortion among the distortions generated in the geomagnetic sensor due to the shielding sheet, but the directional distortion caused by the hysteresis phenomenon is difficult to accurately correct, and thus the hysteresis distortion problem is solved.
- the digitizer function when using the digitizer function, the digitizer function is activated when a force of the tip of the electronic pen is applied to the tempered glass provided on the touch screen panel or the display panel.
- the thickness of the letters is changing by detecting the pressure of the pen pressure. Therefore, it is required to implement a non-contact pen function in order to improve the ease of use, durability and sensitivity of the digitizer function.
- the present invention has been proposed to solve the above problems of the prior art, the basic object of the superheat treatment to a temperature above the critical temperature when producing a nanocrystalline ribbon having a nanocrystalline microstructure by heat-treating the ribbon or strip of amorphous alloy According to the BH loop is changed within the initial magnetization curve, it is easy to manufacture a shielding sheet of the desired specific permeability, and to provide a magnetic field shielding sheet for digitizers having a wide selection of permeability of the shielding sheet and a method of manufacturing the same.
- Another object of the present invention is for digitizers which can improve the sensitivity of the electronic pen while shielding the electromagnetic fields generated from various components of the portable terminal device when implementing the digitizer function in the portable terminal device while minimizing the influence on the geomagnetic sensor.
- the present invention provides a magnetic shielding sheet, a manufacturing method thereof, and a portable terminal device having a digitizer function using the same.
- the permeability higher than the polymer sheet and having the same or higher permeability as the heat-treated Fe-based or Co-based amorphous ribbon, it is possible to execute the digitizer function without contact with the display surface of the terminal device.
- the present invention provides a magnetic field shielding sheet for digitizers and a method of manufacturing the same, which can prevent the problem of magnetic hysteresis distortion in processing to prevent saturation.
- Another object of the present invention is to fill the gaps between the fine particles of the nano-grain ribbon by the flake lamination treatment after the flake treatment of the nano-crystal ribbon to prevent moisture penetration and at the same time all sides of the fine pieces to the adhesive (dielectric)
- the present invention provides a magnetic field shielding sheet for digitizers and a method of manufacturing the same, which can prevent flake current from falling by insulating fine pieces from each other by enclosing to reduce eddy currents.
- Another object of the present invention is a magnetic field shielding sheet for digitizers having high productivity and low manufacturing cost while maintaining the original thickness of the sheet can be formed by sequentially performing the flake and laminating treatment in a roll-to-roll method and its It is to provide a manufacturing method.
- the present invention comprises a thin magnetic sheet of at least one layer made of nanocrystalline alloy and separated into a plurality of fine pieces; A protective film bonded to one side of the thin magnetic sheet through a first adhesive layer; And a double-sided tape bonded to the other side of the thin magnetic sheet through a second adhesive layer provided on one side, wherein the thin magnetic sheet is heat-treated at 300 ° C. to 700 ° C. for an amorphous ribbon made of nanocrystalline alloy.
- a magnetic shielding sheet for a digitizer is provided.
- the present invention comprises the steps of heat-treating at least one amorphous ribbon sheet at 300 °C to 700 °C for 30 minutes to 2 hours to form a thin magnetic sheet with a nanocrystalline microstructure; Forming a laminated sheet by attaching a double-sided tape having a protective film and an exposed film formed on both sides of the thin magnetic sheet; Flake-processing the laminated sheet to divide the thin magnetic sheet into a plurality of fine pieces; And laminating the flake-treated laminated sheet, wherein the laminated sheet is flattened and slimmed by lamination, and a part of the first and second adhesive layers provided on the protective film and the double-sided tape are formed in the plurality of sheets.
- a method of manufacturing a magnetic field shielding sheet for digitizers characterized in that the filling of the gap of the fine pieces to insulate (isolation) the plurality of fine pieces.
- the present invention comprises at least one layer of a first magnetic sheet made of a nano-crystalline alloy and flakes separated into a plurality of fine pieces; A protective film adhered to one side of the first magnetic sheet through a first adhesive layer; And a double-sided tape adhered to the other side of the first magnetic sheet through a second adhesive layer provided on one side, wherein a part of the first and second adhesive layers provided on the protective film and the double-sided tape are formed in the plurality of the plurality of the plurality of adhesive sheets.
- the first magnetic sheet provides a portable terminal device having a digitizer function, characterized in that the BH loop is changed within an initial magnetization curve by filling a gap of fine pieces to insulate the plurality of fine pieces.
- the azimuth distortion and sensor sensitivity distortion can be corrected among the distortions generated in the geomagnetic sensor due to the magnetic shielding sheet, but the hysteresis distortion is considered to be difficult to accurately correct.
- a magnetic shielding sheet is proposed that does not occur.
- the magnetic shielding sheet of the present invention does not cause a hysteresis distortion problem, but only azimuth distortion and sensor sensitivity distortion, so that such distortion can be solved through correction, thereby implementing a distortion-free navigation function. .
- the BH loop is changed within the initial magnetization curve as the superheat treatment is performed at a temperature above the critical temperature when the nanocrystal ribbon having the nanocrystalline microstructure is manufactured by heat treating the ribbon or strip of the amorphous alloy. It is easy to manufacture a shield sheet with a specific permeability desired, and the permeability selection of the shield sheet is wide.
- the present invention can easily control the magnetic permeability of the shielding sheet to a desired value according to the heat treatment temperature, and the magnetic permeability of the shielding sheet can be easily controlled to absorb the magnetic flux necessary to perform the digitizer function with high sensitivity.
- the magnetic shielding sheet of the present invention is a non-heat-treated Fe-based or Co-based amorphous ribbon sheet that generates a magnetic hysteresis distortion in the geomagnetic sensor, but excellent in the polymer sheet or the low permeability of the shielding sheet and excellent magnetic thickness and magnetic permeability characteristics
- the digitizer function is implemented in the portable terminal, thereby shielding the electromagnetic fields generated from various components of the portable terminal, and improving the sensitivity of the electronic pen.
- the magnetic permeability characteristics are hardly changed even when the thin ribbon becomes flake, and thus the surface resistance of the ribbon is increased by heat treatment, and the ribbon surface area is reduced by flake treatment after the heat treatment.
- the magnetic field is increased to prevent magnetic saturation and to reduce the loss due to eddy current.
- the magnetic permeability for the magnetic field shielding function is maximized by heat treatment of the ribbon or strip of the amorphous alloy with a nanocrystalline microstructure, and the antimagnetic field is increased by the flake treatment to increase the magnetic Processing to prevent saturation can block the hysteresis distortion problem.
- the nanocrystalline ribbon sheet of the present invention is separated and / or cracked into a plurality of fine pieces by a flake treatment, even if a magnetic field is applied from the outside along one side of the sheet, the attenuation is reduced while passing through the plurality of fine pieces. Almost no divergence occurs on the opposite side of the sheet generated and the magnetic field inputted.
- the magnetic sheet phenomenon does not occur in the shielding sheet, so that the azimuth error of the geomagnetic sensor can be removed through a correction algorithm, and the magnetic permeability characteristics of the magnetic sheet are higher than those of the polymer sheet. It has the advantage that the azimuth error of the geomagnetic sensor hardly occurs while improving the pen function.
- the digitizer function is maximized and magnetic field is shielded by greatly reducing the loss caused by eddy current. Implement it without affecting parts such as battery.
- the magnetic permeability of the geomagnetic sensor such as Fe-based or Co-based amorphous ribbon
- the magnetic permeability of the magnetic permeability to perform the digitizer function with little sensitivity to the magnetic flux required to perform the digitizer function with high sensitivity
- the gap between the fine pieces of the nanocrystalline ribbon is filled by the adhesive lamination treatment after the flake treatment of the nanocrystalline ribbon to prevent moisture penetration and at the same time surround all sides of the fine pieces with the adhesive (dielectric).
- the fine pieces can be insulated from each other to reduce the eddy current, thereby preventing the shielding performance from deteriorating.
- sheet forming can be performed by sequentially performing flakes and laminating processes by a roll-to-roll method, thereby maintaining high productivity and low manufacturing cost while maintaining the original thickness of the sheet.
- FIG. 1 is an exploded perspective view showing a magnetic shielding sheet for a digitizer according to a preferred embodiment of the present invention
- FIG. 2 is a cross-sectional view showing a first embodiment using one nanocrystalline ribbon sheet in FIG.
- 3A and 3B are exploded perspective views and cross-sectional views of an assembled magnetic field shielding sheet in a state in which a protective film and a release film are removed as a second embodiment using a two-layered nanocrystalline ribbon sheet in FIG. 1;
- FIGS. 4 and 5 are cross-sectional views showing the structure of the protective film and double-sided tape used in the present invention, respectively;
- FIG. 6 is a process chart for explaining a process for manufacturing a magnetic shielding sheet according to the present invention.
- FIG. 7 is a graph showing the relationship between the heat treatment temperature of the nanocrystalline ribbon sheet used in the magnetic shielding sheet according to the present invention and the magnetic permeability of the sheet,
- FIG. 10 is a cross-sectional view showing a state where the flakes of the laminated sheet according to the present invention.
- 11 and 12 are cross-sectional views showing the lamination process of the flake-laminated sheet according to the invention, respectively;
- FIG. 13 is a cross-sectional view illustrating a state in which a magnetic field shielding sheet for a wireless charger according to a first embodiment of the present invention is laminated after flake processing;
- 14A and 14B are enlarged photographs of the humidity test of the magnetic field shielding sheet not subjected to the lamination process after the flake treatment, respectively, and an enlarged photograph after the humidity test of the laminated magnetic field shielding sheet after the flake treatment according to the present invention
- 15A to 15C are diagrams each showing a hybrid magnetic field shielding sheet constructed using heterogeneous materials having different permeability according to a third embodiment of the present invention.
- 16 is a cross-sectional view showing a magnetic shielding sheet for digitizers having an electromagnetic shielding function according to a fourth embodiment of the present invention.
- FIG. 17 is a schematic exploded perspective view showing a structure in which a magnetic shielding sheet according to the present invention is applied to a portable terminal having a digitizer function;
- 20A and 20B are graphs showing the angle error of the five geomagnetic sensors and the angle error of the geomagnetic sensor varying according to the rotation direction when the heat-treated Fe-based amorphous ribbon sheet having a inductance value of 19 uH (Comparative Example 1), respectively. ,
- 21A and 21B are graphs showing the angle error of the five geomagnetic sensors and the angle error of the geomagnetic sensor which change according to the rotation direction when the polymer sheet (Comparative Example 2) having an inductance value of 15 uH is applied.
- 24A and 24B illustrate the angle error of the five geomagnetic sensors and the angle error of the geomagnetic sensor varying according to the rotation direction when the nanocrystalline ribbon sheet (Example 3) of the present invention having an inductance value of 18.5uH, respectively.
- 25A and 25B illustrate the angle error of the five geomagnetic sensors and the angle error of the geomagnetic sensor varying according to the rotation direction when the nanocrystalline ribbon sheet of the present invention having an inductance value of 19.5 uH (Example 4), respectively.
- FIG. 26 is a graph showing a change in inductance for each frequency of the Fe-based amorphous ribbon sheet (Comparative Example 1), the metal powder sheet, and the nanocrystalline ribbon sheets (Examples 1 and 2) of the present invention.
- the magnetic shielding sheet 10 is a thin magnetic sheet, which is a nano-grain microcrystal by heat-treating an ribbon or strip (hereinafter, simply referred to as “ribbon”) of an amorphous alloy.
- ribbon a nano-grain microcrystal by heat-treating an ribbon or strip (hereinafter, simply referred to as “ribbon”) of an amorphous alloy.
- the protective adhesive adhered to one side of the nanocrystalline ribbon sheet 2 It includes a film (1), a double-sided tape (3) laminated on the other side of the nano-crystalline ribbon sheet (2), a release film (4) bonded to the exposed surface of the double-sided tape (3).
- the nanocrystalline ribbon sheet 2 has a two-layer structure
- a double-sided tape is inserted in the middle.
- the nanocrystalline ribbon sheet 2 may be a ribbon of a thin plate made of a Fe-based nanocrystalline magnetic alloy.
- the Fe-based nanocrystalline magnetic alloy it is preferable to use an alloy that satisfies the following expression (1).
- A is at least one element selected from Cu and Au
- D is selected from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Ni, Co and rare earth elements
- E represents at least one element selected from Mn, Al, Ga, Ge, In, Sn, and platinum group elements
- Z represents at least one element selected from C, N, and P
- c, d, e, f, g and h are relations 0.01 ⁇ c ⁇ 8at%, 0.01 ⁇ d ⁇ 10at%, 0 ⁇ e ⁇ 10at%, 10 ⁇ f ⁇ 25at%, 3 ⁇ g ⁇ 12at%, 15 ⁇ f + g + h ⁇ 35 at%, respectively, and the area ratio of the alloy structure is 20% or more of the microstructure having a particle size of 50nm or less.
- element A is used to improve the corrosion resistance of the alloy, to prevent coarsening of crystal grains, and to improve magnetic properties such as iron loss and permeability of the alloy. If the content of element A is too small, it is difficult to obtain the effect of suppressing coarsening of crystal grains. On the contrary, when there is too much content of A element, magnetic property will deteriorate. Therefore, it is preferable to make content of element A into the range of 0.01-8 at%.
- D element is an element effective for uniformizing the grain diameter and reducing the magnetic strain. It is preferable to make content of D element into the range of 0.01-10 at%.
- the element E is an element effective for improving the soft magnetic properties and the corrosion resistance of the alloy. It is preferable to make content of E element into 10 at% or less.
- Si and B are elements which form amorphousization of the alloy at the time of magnetic sheet manufacture. It is preferable to make content of Si into the range of 10-25 at%, and it is preferable to make content of B into the range of 3-12 at%.
- Z element may be included in the alloy as an amorphous compositional element of alloys other than Si and B. In that case, it is preferable to make the total content of Si, B, and Z elements into the range of 15-35 at%.
- the fine crystal structure is preferably formed to realize a structure in which grains having a particle diameter of 5 to 30 nm exist in the range of 50 to 90% by area ratio in the alloy structure.
- the Fe-based nanocrystalline magnetic alloy used in the nanocrystalline ribbon sheet (2) may use a Fe-Si-B-Cu-Nb alloy, in this case, Fe is 73-80 at%, Si and B It is preferable that the sum is 15-26 at% and the sum of Cu and Nb is 1-5 at%.
- This composition range of the amorphous alloy produced in the form of a ribbon can be easily precipitated into the crystal grains of the nano phase by the heat treatment described later.
- the protective film 1 is adhered to one side by using one nanocrystalline ribbon sheet 2 as a magnetic sheet.
- the release film 4 is bonded to the other side through the double-sided tape (3).
- the magnetic shielding sheet 10 according to the first embodiment of the present invention is a large display having a larger area than a smartphone, for example, in the case of a portable terminal device having a width of 100 mm, two sheets having a width of 50 mm in the longitudinal direction. Can be used with butt or overlap connection.
- the currently produced amorphous ribbon has a width of about 50mm, so that when the two sheets are used in a butt connection in the longitudinal direction, it is possible to cover the magnetic shielding sheet 10 for a portable terminal device having a width of 100mm.
- the magnetic sheet 10b for a portable terminal device having a width of 100 mm is formed as in the second embodiment shown in FIGS. 3A and 3B, the magnetic sheet is formed of the first and second nanocrystalline ribbon sheets on one layer. 21,22) Butt or overlapping two sheets, and laminating a wide double-sided tape (3a) thereon, the first and second nanocrystalline ribbon sheet (21, 22) on top of the double-sided tape (3a)
- the magnetic shielding sheet 10b for a wide portable terminal device can be configured by stacking two third and fourth nanocrystalline ribbon sheets 23 and 24 with each other by crossing each other at right angles.
- the double-sided tape 3a is inserted between the plurality of nanocrystalline ribbon sheets 21-24 as in the second embodiment.
- the protective film 1 used in the present invention is, for example, polyethylene terephthalate (PET) film, polyimide film, polyester film, polyphenylene sulfide (PPS) film, polypropylene (PP) film as shown in FIG. ,
- a base material 11 such as a fluororesin film such as polyterephthalate (PTFE) may be used, and the first adhesive layer 12 is formed on one side thereof, and the nanocrystalline ribbon sheets 2, 21-24 may be used.
- PTFE polyterephthalate
- the release film 4a attached to protect the first adhesive layer 12 on the other surface of the first adhesive layer 12 is removed and attached.
- the protective film 1 can use what is 1-100 micrometers, Preferably it is the range of 10-30um, It is good to have a thickness of 10um more preferably.
- a fluororesin-based film such as polyethylene terephthalate (PET) film
- PET polyethylene terephthalate
- the double-sided tape (3a, 3b) is inserted between the nano-crystalline ribbon sheet (21-24) to mutually bond the nano-crystalline ribbon sheet (21-24) to remove all the release film (4, 4b) of both sides
- the double-coated tape 3b bonded to the outside of the lowermost nanocrystalline ribbon sheet 21.22 of the stacked nanocrystalline ribbon sheets 21-24 is exposed to the outside. Manufacturing is performed with the release film 4 attached.
- the double-sided tapes 3, 3a and 3b are also applicable to the type with the base as described above and the type of inorganic material formed only of the adhesive layer without the base. In the case of the double-sided tapes 3a and 3b inserted between the nanocrystalline ribbon sheets 21-24, it is preferable to use an inorganic material type in view of thinning.
- an acrylic adhesive may be used, and other types of adhesives may be used.
- the double-sided tape 3 can be used having a thickness of 10, 20, 30um, preferably having a thickness of 10um.
- Magnetic field shielding sheet (10, 10a, 10b) may be made of a rectangle corresponding to the digitizer 54, as shown in Figures 1 to 3, preferably magnetic shielding is required According to the shape of the site, it has a corresponding shape.
- the nanocrystalline ribbon sheet 2 used in the magnetic shielding sheet 10 may have a thickness of, for example, 15 to 35 ⁇ m per sheet.
- the thickness of the nanocrystalline ribbon sheet 2 is preferably set to 25 to 30 ⁇ m in consideration of the handling after the heat treatment of the nanocrystalline ribbon sheet 2 and the processing step when the ribbon is overlapped by two or more sheets. As the thickness of the ribbon becomes thinner, the ribbon may break even after slight impact during handling after heat treatment. In particular, when two ribbons are overlapped, the ribbon may be thin because the ribbon is thin, and thus the handling may be difficult. .
- an ultra-thin amorphous ribbon of 30 ⁇ m or less made of a nano-crystalline alloy, for example, a Fe-Si-B-Cu-Nb alloy, as a Fe-based amorphous ribbon, is prepared by quench solidification (RSP) by melt spinning (S11). ), So as to facilitate the post-treatment after heat treatment, first cut to a predetermined length and laminated in a sheet form (S12).
- RSP quench solidification
- S11 melt spinning
- the laminated amorphous ribbon sheet is heat treated at a temperature of 300 ° C to 700 ° C for 30 minutes to 2 hours to form a nanocrystalline ribbon sheet (2: 21-24) on which nanocrystal grains are formed (S13).
- the nanocrystalline ribbon sheet (2: 21-24) is made of a nano-crystalline alloy in the form of a ribbon or strip, and then subjected to a magnetic field heat treatment for 30 minutes to 2 hours at a heat treatment temperature section (Tp) of 300 °C to 700 °C. It obtains through the method of depositing fine crystal particle
- the heat treatment atmosphere is more than 70at% of the Fe content, so if the heat treatment is performed in the air, the oxidation is not preferable in terms of visual, it is preferably made in a nitrogen atmosphere. However, even if the heat treatment is performed in an oxidizing atmosphere, the magnetic permeability of the sheet is not substantially different under the same temperature conditions.
- the heat treatment temperature is less than 300 °C nano-crystal grains are not generated sufficiently, the desired permeability is not obtained, the heat treatment time is long, there is also a problem that the flake of the magnetic sheet does not occur well when the subsequent flake process If the temperature exceeds 700 ° C., the permeability is significantly lowered due to overheating. If the heat treatment temperature is low, the treatment time is long, and conversely, if the heat treatment temperature is high, the treatment time is preferably shortened.
- the heat treatment temperature is increased to generate nanocrystals from 300 ° C.
- the inductance value of the heat-treated amorphous ribbon ie, the sheet
- the inductance value of the sheet increases with increasing temperature, and is 580 ° C. to 600 ° C.
- the inductance value of the sheet increases to the maximum.
- the inductance value of the sheet shows a sharply reduced value inversely proportional to the heat treatment temperature.
- the amorphous ribbons have individual deviations resulting in maximum inductance values between 580 ° C and 600 ° C.
- the permeability of the sheet is proportional to the inductance value. Therefore, when the superheat treatment is performed at a temperature between 580 ° C. and 600 ° C. and between 700 ° C., the sheet having the desired permeability can be easily manufactured by using the characteristic that the inductance value of the sheet is almost linearly reduced. Can be.
- the amorphous ribbon becomes brittle when the overheat treatment is performed in the overheat treatment temperature range (To) between 580 ° C and 700 ° C, so that the flakes can be easily formed when the flake treatment is performed in a subsequent process.
- the superheat treatment temperature section To is wide, heat treatment using the superheat treatment temperature section To increases the permeability selection of the shielding sheet.
- the surface permeability of the heat-treated sheet can be obtained by measuring the inductance value of the sheet at a condition of 100 kHz and 1 V on an LCR meter using a coil of 12.1 uH, and then converting it from the obtained inductance value of the sheet.
- Inductance values of 15 uH for polymer sheets and 19.5 uH for non-heat treated Fe-based amorphous sheets are obtained.
- the nanocrystalline ribbon sheet heat-treated as the heat treatment of 300 °C to 700 °C shows an inductance value in the range of 13 to 21uH.
- the desired permeability may be selected by heat treatment to have an inductance value in the range of 13 to 21 uH, preferably 15 to 21 uH.
- the nanocrystalline ribbon sheet with inductance value between 13 and 15uH is used as the shielding sheet, the magnetic permeability is low because the magnetic permeability is low, but the geomagnetic sensor has low magnetic permeability and can be used without correction. Since the hysteresis is not shown, the azimuth error due to the hysteresis is not generated.
- the protective film 1 is attached to one side and the double-sided tape 3 to which the release film 4 is attached to the other side using one or two sheets of the nanocrystalline ribbon sheet 2 to which the heat treatment was performed.
- the flake processing is performed in one state (S14).
- the double-sided tape 3a is inserted between the ribbon sheets 21-24 to allow mutual adhesion.
- the flake treatment may include a protective film 1, a nanocrystalline ribbon sheet 2, and a laminated sheet 100 in which a double-sided tape 3 and a release film 4 are sequentially stacked in FIGS. 8 and 9.
- the nanocrystalline ribbon sheet 2 is separated into a plurality of fine pieces 20 by passing through the illustrated first and second flake devices 110 and 120.
- the separated plurality of fine pieces 20 are kept separated by the first and second adhesive layers 12 and 31 adhered to both sides as shown in FIG. 10.
- the usable first flake device 110 is, for example, as shown in FIG. 8, the metal roller 112 having a plurality of irregularities 116 formed on an outer surface thereof, and is disposed to face the metal roller 112. It may be composed of a rubber roller 114, the second flake device 120, as shown in Figure 9, the metal roller 122 and the metal roller 122 is mounted a plurality of spherical balls 126 on the outer surface It may be composed of a rubber roller 124 is disposed opposite to.
- the nanocrystalline ribbon sheet 2 is separated into a plurality of fine pieces 20, as shown in FIG.
- the gap 20a is generated between the pieces 20.
- the magnetic permeability of the sheet is increased by removing the hysteresis loss by increasing the anti-magnetic field. It will increase the uniformity of.
- nanocrystalline ribbon sheet 2 reduces the surface area of the fine pieces 20 by the flake treatment, it is possible to block the heat generation problem due to the eddy current generated by the alternating magnetic field.
- a gap 20a is present between the fine pieces 20, and when moisture penetrates into the gap 20a, the amorphous ribbon is oxidized so that the appearance of the amorphous ribbon becomes poor and shielding. The performance will drop.
- the size of the fine pieces 20 may increase, thereby increasing the eddy current loss.
- the flake-treated laminated sheet 200 may cause a surface unevenness of the sheet during flake processing, it is necessary to stabilize the flake-treated ribbon.
- the flake-laminated sheet 200 performs a lamination process for flattening, slimming, and stabilizing at the same time filling the adhesive with the gap 20a between the fine pieces 20 (S15).
- the microflakes 20 can be separated from each other by enclosing all surfaces of the microflakes 20 with an adhesive to reduce eddy currents.
- the laminate apparatus 400 and 500 for the lamination process is a second pressing roller 210 and the first pressing roller 210 passing through the flake-laminated sheet 200 as shown in FIG.
- the roll press type consisting of the pressure roller 220 may be applied, and as shown in FIG. 12, the upper pressurized to be vertically movable above the lower pressurizing member 240 and the lower pressurizing member 240.
- a hydraulic press type consisting of the member 250 can be used.
- the flake-laminated sheet 200 When the flake-laminated sheet 200 is heated to room temperature or 50 to 80 ° C. and then passed through the laminating devices 400 and 500, the first adhesive layer 12 of the protective film 1 is pressed while the first adhesive layer 12 is pressed. Some of the adhesive is introduced into the gap 20a and the double-sided tape 30 is pressed, so that some of the adhesive of the second adhesive layer 31 is introduced into the gap 20a to seal the gap 20a.
- first adhesive layer 12 and the second adhesive layer 31 may be an adhesive that can be deformed when pressed at room temperature, or a thermoplastic adhesive that is deformed by applying heat may be used.
- the thicknesses of the first adhesive layer 12 and the second adhesive layer 31 preferably have a thickness of 50% or more relative to the thickness of the amorphous ribbon so as to sufficiently fill the gap 20a between the plurality of fine pieces.
- an interval between the upper pressing member 250 and the lower pressing member 240 is preferably formed to be 50% or less of the thickness of the laminated sheet 200.
- any device may be used as long as the flakes and the pressing process of the laminated sheets 100 and 200 can be made.
- the electromagnetic wave absorbing sheet 10 As shown in Figure 13, the nano-adhesive ribbon sheet 2 is separated into a plurality of fine pieces 20, the first adhesive layer ( 12) and the second adhesive layer 31 partially fill the gaps 20a between the fine pieces 20 to have a structure to prevent oxidation and flow of the nanocrystalline ribbon sheet 2.
- the magnetic field shielding sheet 10-10b made of the laminate is stamped into a square shape having a size corresponding to the digitizer 54 to produce a product (S16).
- one protective film 1 is attached to one side of the magnetic sheet 2 to flake and laminate treatment.
- damage to the protective film 1 may occur when the flake process is performed. Therefore, preferably, another protective film for protecting the protective film 1 is attached to the upper portion of the protective film 1 to proceed with the treatment process, and then the protective film on the surface is peeled off and removed after the treatment is completed.
- the magnetic field shielding sheet 10 according to the present invention obtained through the flake and the lamination process and the laminated sheet 200 without the lamination process after the flake treatment were subjected to a humidity test at a temperature of 85 ° C. and a humidity of 85% for 120 hours. .
- the magnetic field shielding sheet 10b according to the second embodiment of the two-layer structure shown in FIGS. 3A and 3B is constructed using the same nanocrystalline ribbon sheets 21-24 as magnetic sheets, but according to the present invention.
- the magnetic field shielding sheet may be constructed using a hybrid thin magnetic sheet made of different materials as in the third embodiment shown in FIGS. 15A to 15C.
- the hybrid thin magnetic plate 35 has a high magnetic permeability between a first magnetic sheet 35a and a low magnetic permeability second magnetic sheet 35b having a lower permeability than the first magnetic sheet.
- the adhesive layer 35c may be inserted into the hybrid form.
- the first magnetic sheet 35a a nanocrystalline ribbon sheet made of the nanocrystalline alloy, a permalloy sheet having excellent soft magnetic properties, or a Moly Permalloy Powder sheet may be used.
- the second magnetic sheet 35b may be a polymer sheet made of magnetic powder and resin having high magnetic permeability such as amorphous alloy powder, soft magnetic powder, and sendust.
- the amorphous alloy powder has a composition selected from the group consisting of, for example, Fe-Si-B, Fe-Si-B-Cu-Nb, Fe-Zr-B, and Co-Fe-Si-B and is amorphous. It is preferable to use an amorphous alloy powder containing at least one alloy.
- the hybrid thin magnetic sheet 36 uses a nanocrystalline ribbon sheet having a predetermined area in the center as the first magnetic sheet 36a, and the outside of the first magnetic sheet 36a. It is also possible to combine a polymer sheet or a ferrite loop with the annular second magnetic sheet 36b which entirely surrounds the first magnetic sheet 36a. That is, a polymer sheet or ferrite having a relatively low permeability compared to the nanocrystalline ribbon sheet is formed in a loop shape and disposed on the outer side of the nanocrystalline ribbon sheet. As a result, it is possible to shield the magnetic field on the digitizer while minimizing the influence on the geomagnetic sensor 60.
- the hybrid thin magnetic plate 37 of the third embodiment is composed of first and second magnetic sheets 37a and 37b having different areas, and the first magnetic sheet 37a is large.
- a nanocrystalline ribbon sheet is used for the area, and the second magnetic sheet 37b is a magnetic sheet having a higher permeability than the nanocrystalline ribbon sheet on one side of the first magnetic sheet 37a, for example, an iron-free amorphous iron sheet. It is also possible to combine in a hybrid form with a width of about 2-3mm.
- the second magnetic sheet 37b overlaps the first magnetic sheet 37a, extends while partially overlapping, or is flat with the first magnetic sheet 37a. Can be extended.
- the second magnetic sheet 37b made of the iron-based amorphous sheet is a geomagnetic sensor 60 disposed on the main circuit board 57. It is installed to be located far from
- the high magnetic permeability second magnetic sheet 37b made of the iron-based amorphous sheet is used in a range capable of minimizing the influence on the geomagnetic sensor 60, and the high magnetic permeability magnetic shield sheet is an electromagnetic wave required to perform a digitizer function.
- the sensitivity of the electronic pen is improved by increasing the transmission rate of the magnetic flux, which helps to absorb the light.
- the hybrid magnetic thin plate magnetic sheet 37 of the third embodiment shown in FIG. 15C uses a magnetic sheet having a higher magnetic permeability than that of the first magnetic sheet 37a. It is also possible to use a magnetic sheet whose sheet 37b is lower than the magnetic permeability of the first magnetic sheet 37a.
- the first magnetic sheet 37a uses a nanocrystalline ribbon sheet
- the second magnetic sheet 37b uses a polymer sheet
- the second magnetic sheet 37b having a low permeability is applied to the main circuit board 57. It is installed to be disposed close to the geomagnetic sensor 60 disposed. As a result, it is possible to shield the magnetic field on the digitizer while minimizing the influence on the geomagnetic sensor 60.
- Figure 16 shows a shielding sheet having an electromagnetic shielding function according to a fourth embodiment of the present invention.
- the shielding sheet 10c of the fourth embodiment is made of a conductive sheet made of Cu or Al foil having excellent conductivity so as to have an additional function for shielding electromagnetic waves on one side of the magnetic field shielding sheet 10 according to the first embodiment. It has a structure in which (5) is bonded using a double-sided tape or an adhesive.
- the conductor sheet 5 is suitably made of 5 to 100um, preferably 10 to 20um.
- the conductor sheet 5 may be formed in the form of a foil by sputtering instead of a foil, instead of Cu, Ni, Ag, Al, Au, Sn, Zn, Mn, or a combination of these metals.
- the shielding sheet 10c having the electromagnetic shielding function may be used when the electromagnetic wave generated from the notebook body is to be blocked from affecting the digitizer, for example, when the digitizer function is provided in a notebook that generates severe electromagnetic waves such as power supply noise. Can be.
- the shielding sheet 10c of the fourth embodiment is attached to the back surface of the digitizer panel PCB through the double-sided tape 3 so that the conductor sheet 5 is exposed toward the main circuit board.
- FIG. 17 is a schematic exploded perspective view illustrating a structure in which a magnetic shielding sheet according to the present invention is applied to a portable terminal having a digitizer function.
- the mobile terminal 50 includes a touch screen panel 52, a display panel 53, a digitizer panel 54, a magnetic field shielding sheet 10, a bracket 56, and a main circuit board. 57 and rear cover 58 are sequentially coupled to each other, and have an electronic pen 51 that is activated by receiving power from the terminal 50 in a non-contact manner.
- an integrated touch panel 52 is disposed on a front surface of the LCD or AMOLED display panel 53 to serve as an interface between the terminal and the user.
- the touch screen panel may be implemented by, for example, an 'on-cell' method that is deposited directly on an amorphous display.
- the pen 51 In order to implement a digitizer function in the terminal 50, the pen 51 has a coil-shaped antenna and circuit elements for wireless communication therein so as to exchange information with the terminal 50 through wireless communication. Receives the power to drive the circuit.
- the pen 51 receives the AC magnetic field of the 100 ⁇ 200kHz band generated by the terminal by applying a wireless charging function by the electromagnetic induction coupling method to wirelessly transmit power to the pen 51 to drive the internal circuit elements
- the wireless communication between the digitizer panel 54 and the pen 51 of the terminal 50 is exchanged using a frequency of 500 kHz or more.
- the electronic pen function is implemented by the digitizer panel 54 disposed below the touch screen / display panels 52 and 53.
- the digitizer panel 54 is a thin metal film, and when electricity is applied thereto, a thin electromagnetic field is generated, and the end of the pen 51 is provided with a micro antenna coil that generates an alternating magnetic field.
- a magnetic shielding sheet 10 is inserted between the digitizer panel 54 and the main circuit board 57.
- the magnetic field shielding sheet 10 may be detachably coupled to the rear surface of the digitizer panel 54 by using a double-sided tape or the like to closely contact the rear surface of the digitizer panel 54 and a separate fixing bracket 56. Can be.
- the method of attaching the magnetic shielding sheet 10 may remove the release film 4 of the magnetic shielding sheet 10 and allow the double-sided tape 3 to be attached to the rear surface of the digitizer panel 54.
- a separate double-sided tape is attached on the protective film 1 of the magnetic field shielding sheet 10 to the rear surface of the digitizer panel 54, and the magnetic field shielding sheet is used.
- the lower portion of 10 may remove the release film 4 and attach the finish to the adhesive layer 33 of the exposed double-sided tape 3.
- the terminal is provided with a geomagnetic sensor 60 to implement a function such as navigation, augmented reality, and is disposed on one side edge of the main circuit board (57).
- the magnetic field shielding sheet 10 has a size corresponding to that of the digitizer panel 54 so as not to affect the digitizer function.
- the magnetic shielding sheet 10 is formed to be somewhat smaller than the size of the main circuit board 57, so that at least 2mm interval is maintained between the magnetic shielding sheet 10 and the geomagnetic sensor 60 in the portable terminal. desirable.
- the magnetic field shielding sheet 10 minimizes the influence on the geomagnetic sensor 60 even when the magnetic field shielding sheet 10 is used in a portable terminal together with the geomagnetic sensor 60 as described above.
- the magnetic field shielding sheet 10 has a nanocrystalline microstructure and is flake-treated at least one layer of the nanocrystalline ribbon sheet 2 separated and / or cracked into a plurality of microflakes 20.
- the demagnetizing field is increased as the surface area of the ribbon is reduced by the flake treatment, thereby preventing magnetic saturation.
- the nano-crystal ribbon sheet 2 can block the heating problem due to the eddy current generated by the alternating magnetic field as the surface area of the ribbon is reduced by the flake treatment.
- the magnetic shielding sheet employed in the portable terminal is mainly embedded to shield the vertical magnetic field applied along the vertical direction of the sheet.
- the portable terminal may be placed in a situation in which a magnetic field, which is much higher than the earth magnetic field, including the earth magnetic field is applied from the side of the sheet.
- the geomagnetic sensor 60 When a conventional iron (Fe) -based amorphous ribbon sheet is applied as a magnetic shielding sheet, when a magnetic field is applied from the outside along one side of the sheet to pass along the plane of the sheet to diverge to the opposite side of the input sheet do. As a result, the geomagnetic sensor 60 has a problem that an angle error occurs due to a difference in sensitivity strengths in the X, Y, and Z directions.
- the nanocrystalline ribbon sheet 2 of the present invention is separated and / or cracked into a plurality of fine pieces 20 by flake processing, even when a magnetic field is applied from the outside along one side of the sheet. Attenuation occurs while passing through the plurality of fine pieces 20, and hardly diverges to the opposite side of the sheet into which the magnetic field is input.
- the geomagnetic sensor 60 is applied even when a magnetic field is applied from the outside along one side of the sheet. Has little impact on
- the saturation field (Hs) value which is the minimum magnetic field for obtaining saturation induction, is weak. It is expressed as 32 A / m (0.4G), which is lower than the Earth's magnetic field of about 0.5G.
- the Fe-based amorphous ribbon sheet exhibits hysteresis even when the earth magnetic field changes.
- the geomagnetic sensor used in the terminal to which the Fe-based amorphous ribbon sheet is applied must be corrected up to the magnetic hysteresis phenomenon by the Fe-based amorphous ribbon sheet. It has a fatal drawback.
- the magnetic history curve of the nanocrystalline ribbon sheet 2 used in the magnetic shielding sheet 10 according to the present invention shows a saturation magnetic field (Hs) value of about 870 A / m ( ⁇ 10.9).
- G is significantly higher than the Earth's magnetic field of about 0.5G.
- the nanocrystalline ribbon sheet 2 changes in the initial magnetization curve without exhibiting hysteresis even when the earth magnetic field changes.
- the nano-crystal ribbon sheet 2 is mounted on the terminal 50 to which the magnetic shielding sheet 10 of the present invention is applied. Since the geomagnetic sensor 60 does not have a hysteresis due to the nanocrystalline ribbon sheet 2, the azimuth correction is easier and has higher accuracy as compared with the case where the heat-free iron-based amorphous ribbon sheet is applied as the magnetic shielding sheet. There is an advantage.
- the geomagnetic sensor does not cause a problem of magnetic hysteresis distortion, but only azimuth distortion and sensor sensitivity distortion, and this distortion can be solved through correction, so that there is no distortion function. Can be implemented.
- the high magnetic permeability magnetic shielding sheet 10 when the high magnetic permeability magnetic shielding sheet 10 is provided in the digitizer panel 54 of the mobile terminal 10, additional functions such as wireless communication or near field communications (NFC) or RFID in the mobile terminal device are provided. Blocking the influence on the digitizer panel 54 by the alternating magnetic field generated when the, and at the same time, the high permeability magnetic field shielding sheet 10 to help absorb the electromagnetic waves required to perform the digitizer function, In other words, the sensitivity of the electronic pen is improved by increasing the transfer rate of the magnetic flux.
- NFC near field communications
- FIG. 20A is a graph illustrating angle errors of five geomagnetic sensors when the sheet of Comparative Example 1 having an inductance value of 19.5 uH is applied.
- FIG. 20A measures five geomagnetic sensors at intervals of 10 degrees from 0 degrees to 360 degrees. The azimuth angle of the geomagnetic sensor with respect to the azimuth angle is distorted.
- FIG. 20B is a graph showing the angle error of the geomagnetic sensor that changes according to the rotation direction when the sheet of Comparative Example 1 having an inductance value of 19.5 uH is applied.
- FIG. 20B is rotated in the right direction (solid line) and the left direction (dotted line), respectively. Measured at 10-degree intervals from degrees to 360 degrees, the degree of azimuth of the geomagnetic sensor relative to each azimuth angle is shown.
- the characteristics of the geomagnetic sensor are about 160 degrees, resulting in a loss of function as a geomagnetic sensor.
- the hysteresis according to the rotation direction is large, and the offset (the degree of the original deviation from the origin) is also about 100% in the Y-axis direction due to the influence of the heat-free Fe-based amorphous ribbon sheet, and the sensitivity is also high.
- Magnetic hysteresis influenced the X-axis to be about 60% smaller than the Y-axis.
- Comparative Example 2 a kind of polymer sheet, is a 50um thick sendust having a 15uH inductance value produced by mixing a high permeability Senddust alloy (ie, Fe-Si-Al alloy) powder with a polymer serving as a binder.
- a protective film and a double-sided tape, respectively, attached to both sides of the sheet were attached to the portable terminal having a digitizer function to measure the operating characteristics of the geomagnetic sensor when shown in Figure 21a and 21b.
- FIG. 21A is a graph illustrating angle errors of five geomagnetic sensors when the sender sheet of Comparative Example 2 having an inductance value of 15 uH is used
- FIG. 21B illustrates the sender sheet of Comparative Example 2 having an inductance value of 15 uH.
- it is a graph showing the angle error of the geomagnetic sensor that changes according to the rotation direction, and was measured in the same manner as in Comparative Example 1.
- the characteristics of the geomagnetic sensor are about 10 degrees in angular error, and thus the accuracy of the geomagnetic sensor is slightly lowered.
- FIG. 21B The hysteresis according to the direction of rotation is very small, the offset is offset by about 16% in the Y-axis direction due to the influence of the sender sheet, and the sensitivity is about 8% smaller than the X-axis.
- Example 1 using a nano-crystalline ribbon sheet having a thickness of 25um and a 16.5uH inductance as a magnetic sheet, the protective film and the double-sided tape were laminated on both sides, respectively, and then digitized by flake and lamination processes.
- a magnetic field shielding sheet in a portable terminal having a measuring operation characteristics for the geomagnetic sensor is shown in Figure 22a and 22b.
- 22A and 22B are graphs showing the angle errors of the five geomagnetic sensors and the angle errors of the geomagnetic sensors varying according to the rotation directions when the sheet of Example 1 having an inductance value of 16.5 uH is applied, respectively. It measured in the same way.
- the angle error is about 9 degrees, and the accuracy of the geomagnetic sensor is slightly dropped.
- the hysteresis phenomenon according to the rotation direction is very small.
- Example 1 The influence of the sheet was so small that the offset was also distorted by about 7% in the Y-axis direction, and the sensitivity was also so small that the X-axis was about 7% smaller than the Y-axis.
- Examples 2 to 4 are the same thickness as in Example 1, each having a thickness of 25um, using a nanocrystalline ribbon sheet having inductance values of 17.5uH, 18.5uH, and 19.5uH, and attaching a 10um thick protective film and double-sided tape to both sides, respectively.
- the characteristics of the geomagnetic sensor when measured as a magnetic field shielding sheet in a portable terminal having a digitizer function through a flake and a lamination process were measured and shown in FIGS. 23A to 25B.
- 23A to 25B illustrate geomagnetic sensors that change according to angle errors and rotation directions of five geomagnetic sensors when the nanocrystalline ribbon sheets of Examples 2 to 4 having inductance values of 17.5 uH, 18.5 uH, and 19.5 uH are respectively applied. It is a graph showing the angle error.
- the second embodiment When the misalignment of the five geomagnetic sensors is measured, the second embodiment generates an angle error of about 6 degrees as shown in FIG. 23A, and the accuracy of the geomagnetic sensor is good, and the third embodiment is about 24 degrees as shown in FIG. 24A.
- An angle error occurs and the accuracy of the geomagnetic sensor is significantly lowered (showing an error change rate of 3/20 when compared with Comparative Example 1).
- Example 4 an angle error of about 35 degrees occurs as shown in FIG.
- the accuracy of the geomagnetic sensor showed a significant drop (showing a 7/32 error rate of change when compared to Comparative Example 1).
- Example 2 is very small and the influence of the sheet is small, as shown in Figure 23b, the offset is less than about 2% , The sensitivity is also small, less than about 2% between the X and Y axes, Example 3 is very small, as shown in Figure 24b and the influence of the sheet is small, the offset is also about 15% in the Y-axis direction, sensitivity
- the X axis is about 18% smaller than the Y axis
- Example 4 the offset is about 26% in the Y axis direction because the sheet is very small and the influence of the sheet is small as shown in FIG. 25B.
- the influence was small and the X axis was about 30% smaller than the Y axis.
- the hysteresis according to the rotation direction as well as the angle error of the geomagnetic sensor in the case of applying the nano-crystalline ribbon sheet of the present invention is seen in all aspects such as hysteresis, offset and sensitivity compared to the comparative example having the same level of inductance value.
- the sheet of the invention was found to be excellent.
- the nanocrystalline ribbon sheet of the present invention has little effect on the geomagnetic sensor when using a sheet of 18 uH having a slightly lower inductance (permeability) than the non-heat treated Fe-based amorphous ribbon sheet of Comparative Example 1.
- the nano-grain ribbon sheet having an inductance value in the range of 15 uH to 18 uH gives almost no angular error to the geomagnetic sensor and can be directly applied without sensor algorithm correction.
- the nanocrystalline ribbon sheet of the present invention having a high inductance value (permeability) in the range of 18 to 21 uH has no magnetic hysteresis unlike the heat-treated Fe-based amorphous ribbon sheet of Comparative Example 1 and is applied through a sensor algorithm correction. This is possible.
- Example 1 the electronic pen was found to be activated at a certain distance from the display surface (ie, tempered glass) of the mobile terminal. Table 1 shows.
- Example 1 Inductance (uH) Pen activation distance (mm) Comparative Example 1 19.5 15-20 Comparative Example 2 15 0 Example 1 16.5 2 Example 2 17.5 5 Example 3 18.5 10 Example 4 19.5 15-20
- the sensitivity of the signal transmitted by the pen increases as the sheet inductance (i.e. permeability) increases and the electronic pen is in a non-contact state. It can be seen that activation of the electronic pen is improved.
- the electronic pen can be activated in a non-contact state with the glass substrate of the display, thereby improving the durability of the display and the electronic pen, and developing another function using the non-contact digitizer function. It becomes possible.
- a nanocrystalline ribbon sheet having inductance values of 16.5 uH and 17.5 uH (Examples 1 and 2) used in the magnetic shielding sheet of the present invention (Examples 1 and 2), and the heat treated Fe-based amorphous ribbon sheet of 19.5 uH, respectively.
- a metal-powder sheet (MP 100u) having a permeability of 100 (inductance value of 15 uH), a metal-powder sheet (MP 130u) having a permeability of 130 (inductance value of 15.4 uH), and a permeability of 150 (inductance value of 15.8) uH) measured the inductance value (Ls) of the sheet according to the frequency change with respect to the metal-powder sheet (MP 150u), and the frequency dependence of 100 kHz to 1 MHz for the Fe-based amorphous ribbon sheet (Comparative Example 1)
- nanocrystalline ribbon sheets (Examples 1 and 2) showed the same permeability characteristics with little frequency dependence from 100 kHz to 1 MHz, and nanocrystalline ribbon sheets having a 16.5 uH inductance value (Example 1).
- Metal with a permeability of 150 It has much higher permeability characteristics than the powder sheet (M-P 150u).
- the nano-crystal ribbon sheet when used, not only the permeability characteristics are good, but also there is little dependence on the frequency at low frequencies, and thus has excellent characteristics as a shielding sheet for digitizers.
- the magnetic permeability for the magnetic field shielding function is maximized by laminating the nanocrystalline ribbon having the nanocrystalline microstructure by heat-treating the ribbon or strip of the amorphous alloy, and the saturation magnetic field (Hs) value is increased by the flake treatment. It has a higher value than the earth's magnetic field to prevent magnetic saturation.
- the nanocrystalline ribbon sheet 2 of the present invention changes within the initial magnetization curve without exhibiting the hysteresis phenomenon in the change of the earth magnetic field, and thus the magnetic shielding sheet 10 employing the nanocrystalline ribbon sheet 2.
- the geomagnetic sensor 60 does not generate an azimuth error due to the hysteresis of the nano-crystal ribbon sheet, thereby minimizing the problem of magnetic hysteresis distortion of the geomagnetic sensor 60 Can be.
- the nano-crystal ribbon sheet 2 of the present invention significantly reduces the distortion phenomenon for the geomagnetic sensor by the external magnetic field as the flake treatment is performed.
- the sheet without the flake treatment generates an azimuth error of about 20 degrees
- the sheet of the present invention subjected to the flake treatment generates an azimuth error within about 6 degrees. Does not affect geomagnetic sensor significantly.
- the magnetic field shielding sheet 10 employing the nanocrystalline ribbon sheet 2 of the present invention is easier to correct the azimuth angle of the geomagnetic sensor as compared with the case of using the conventional heat-free iron-based amorphous ribbon sheet as the magnetic field shielding sheet. It has the advantage of having a high accuracy, and has a higher permeability compared to when using a polymer sheet composed of magnetic powder and binder, it is possible to implement a high sensitivity wireless electronic pen function.
- the gap between the fine pieces of the nanocrystalline ribbon is filled by the adhesive lamination treatment after the flake treatment of the nanocrystalline ribbon to prevent moisture penetration and at the same time surround all sides of the fine pieces with the adhesive (dielectric).
- the fine pieces can be insulated from each other to reduce the eddy current, thereby preventing the shielding performance from deteriorating.
- sheet forming can be performed by sequentially performing flakes and laminating processes by a roll-to-roll method, thereby maintaining high productivity and low manufacturing cost while maintaining the original thickness of the sheet.
- the present invention is applied to various portable electronic devices including a portable terminal device having a digitizer function, while at the same time minimizing the effect on the geomagnetic sensor while shielding the electromagnetic fields generated from various components of the portable terminal device body when implementing the digitizer function in the portable terminal device It can be applied to a magnetic shielding sheet capable of improving the sensitivity of the electronic pen.
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Abstract
Description
인덕턴스(uH) | 펜 활성화 거리(mm) | |
비교예 1 | 19.5 | 15-20 |
비교예 2 | 15 | 0 |
실시예 1 | 16.5 | 2 |
실시예 2 | 17.5 | 5 |
실시예 3 | 18.5 | 10 |
실시예 4 | 19.5 | 15-20 |
Claims (20)
- 나노 결정립 합금으로 이루어지고 플레이크 처리되어 다수의 미세 조각으로 분리된 적어도 1층의 박판 자성시트;상기 박판 자성시트의 일측면에, 제1접착층을 통하여 접착되는 보호필름; 및상기 박판 자성시트의 타측면에, 일측면에 구비된 제2접착층을 통하여 접착되는 양면 테이프를 포함하며,상기 박판 자성시트는 나노 결정립 합금으로 이루어진 비정질 리본을 300℃ 내지 700℃에서 열처리한 것을 특징으로 하는 디지타이저용 자기장 차폐시트.
- 제1항에 있어서, 상기 박판 자성시트는 B-H 루프가 초기자화곡선 내에서 변화가 이루어지는 것을 특징으로 하는 디지타이저용 자기장 차폐시트.
- 제1항에 있어서, 상기 비정질 리본은 600℃ 내지 700℃의 열처리 온도구간에서 과열처리가 이루어지며, 13 내지 21uH 범위의 인덕턴스 값을 갖는 것을 특징으로 하는 자기장 차폐시트.
- 제1항에 있어서, 상기 박판 자성시트는 포화자기장(Hs) 값이 지구자기장 보다 높은 값을 갖도록 설정되는 것을 특징으로 하는 디지타이저용 자기장 차폐시트.
- 제1항에 있어서, 상기 박판 자성시트는 다층 구조를 갖는 나노 결정립 리본시트; 및상기 나노 결정립 리본시트 사이에 삽입되어 적층되는 양면 테이프를 포함하며,상기 각 층의 나노 결정립 리본시트는 맞대음 연결되는 한쌍의 나노 결정립 리본시트로 이루어지고, 인접한 각쌍의 나노 결정립 리본시트는 서로 직교 방향으로 배치되는 것을 특징으로 하는 디지타이저용 자기장 차폐시트.
- 제1항에 있어서, 상기 박판 자성시트의 일측변 또는 외주에 환형으로 중첩되며, 상기 박판 자성시트보다 낮거나 높은 투자율을 갖는 보조 자성시트를 더 포함하는 것을 특징으로 하는 디지타이저용 자기장 차폐시트.
- 제1항에 있어서, 상기 박판 자성시트는나노 결정립 리본시트;상기 나노 결정립 리본시트에 적층되며 나노 결정립 리본시트보다 낮은 투자율을 갖는 폴리머 시트; 및상기 나노 결정립 리본시트와 폴리머 시트를 상호 접착시키며 상기 다수의 미세 조각 사이의 틈새를 충진하는 접착층을 포함하는 것을 특징으로 하는 디지타이저용 자기장 차폐시트.
- 제1항에 있어서,상기 다수의 미세 조각 사이의 틈새는 상기 제1접착층과 제2접착층의 일부가 충진되어 상기 다수의 미세 조각을 절연(isolation)시키는 것을 특징으로 하는 디지타이저용 자기장 차폐시트.
- 제8항에 있어서, 상기 다수의 미세 조각은 수십 um 내지 3mm 크기로 이루어지는 것을 특징으로 하는 디지타이저용 자기장 차폐시트.
- 제1항에 있어서, 상기 보호필름의 외측면에 박판으로 형성되어 전자파를 차폐하기 위한 전도체 시트를 더 포함하는 것을 특징으로 하는 디지타이저용 자기장 차폐시트.
- 적어도 하나의 비정질 리본시트를 300℃ 내지 700℃에서 30분 내지 2시간 동안 열처리하여 나노 결정립 미세조직이 형성된 박판 자성시트를 형성하는 단계;상기 박판 자성시트의 양측면에 보호 필름과 노출면에 릴리즈 필름이 형성된 양면 테이프를 부착하여 적층시트를 형성하는 단계;상기 적층시트를 플레이크 처리하여 상기 박판 자성시트를 다수의 미세 조각으로 분할하는 단계; 및상기 플레이크 처리된 적층시트를 라미네이트하는 단계를 포함하며,상기 적층시트는 라미네이트 처리에 의해 평탄화 및 슬림화가 이루어짐과 동시에 상기 보호 필름과 양면 테이프에 구비된 제1 및 제2 접착층의 일부가 상기 다수의 미세 조각의 틈새로 충진되어 상기 다수의 미세 조각을 절연(isolation)시키는 것을 특징으로 하는 디지타이저용 자기장 차폐시트의 제조방법.
- 제11항에 있어서, 상기 비정질 리본은 나노 결정립 합금으로 이루어지며, 13 내지 21uH 범위의 인덕턴스 값을 갖도록 600℃ 내지 700℃의 열처리 온도구간에서 과열처리가 이루어지는 것을 특징으로 하는 디지타이저용 자기장 차폐시트의 제조방법.
- 제11항에 있어서, 상기 다수의 미세 조각은 수십 um 내지 3mm 크기로 이루어지는 것을 특징으로 하는 디지타이저용 자기장 차폐시트의 제조방법.
- 제11항에 있어서, 상기 라미네이트 단계 이후에 상기 보호필름의 외측면에 Cu 또는 Al 포일을 접착하는 단계를 더 포함하는 것을 특징으로 하는 디지타이저용 자기장 차폐시트의 제조방법.
- 디지타이저 패널과 메인회로기판 사이에 삽입되어 상기 메인회로기판으로부터 발생된 교류 자기장을 차폐하는 자기장 차폐시트를 구비하는 휴대 단말기기에 있어서,상기 자기장 차폐시트는나노 결정립 합금으로 이루어지고 플레이크 처리되어 다수의 미세 조각으로 분리된 적어도 1층의 제1 자성시트;상기 제1 자성시트의 일측면에, 제1접착층을 통하여 접착되는 보호필름; 및상기 제1 자성시트의 타측면에, 일측면에 구비된 제2접착층을 통하여 접착되는 양면 테이프를 포함하며,상기 보호 필름과 양면 테이프에 구비된 제1 및 제2 접착층의 일부가 상기 다수의 미세 조각의 틈새로 충진되어 상기 다수의 미세 조각을 절연(isolation)시키며, 상기 제1 자성시트는 B-H 루프가 초기자화곡선 내에서 변화가 이루어지는 것을 특징으로 하는 디지타이저 기능을 갖는 휴대 단말기기.
- 제15항에 있어서, 상기 제1 자성시트는 포화자기장(Hs) 값이 적어도 지구자기장 보다 높은 값을 갖도록 설정되는 것을 특징으로 하는 디지타이저 기능을 갖는 휴대 단말기기.
- 제15항에 있어서, 상기 메인회로기판의 일측 모서리에 배치되는 지자기 센서를 더 포함하며,상기 자기장 차폐시트는 디지타이저에 대응하는 형상으로 이루어진 것을 특징으로 하는 디지타이저 기능을 갖는 휴대 단말기기.
- 제15항에 있어서, 상기 자기장 차폐시트는메인 차폐시트; 및상기 메인 차폐시트의 투자율보다 높은 투자율을 가지며, 상기 메인 자폐시트의 일측 변으로부터 중첩되거나, 부분적으로 오버랩되면서 연장 형성되거나, 메인 자폐시트와 평탄하게 연장 형성되는 보조 차폐시트를 포함하며,상기 보조 차폐시트는 지자기 센서가 배치된 위치로부터 가능한 멀리 떨어진 위치에 설정되는 것을 특징으로 하는 디지타이저 기능을 갖는 휴대 단말기기.
- 제15항에 있어서, 상기 제1 자성시트는 과열처리되어 15 내지 21uH 범위의 인덕턴스 값을 갖는 것을 특징으로 하는 디지타이저 기능을 갖는 휴대 단말기기.
- 제15항에 있어서, 상기 제1 자성시트와 다른 투자율을 가지며 상기 제1 자성시트의 일측면에 적층되는 제2 자성시트를 더 포함하는 것을 특징으로 하는 디지타이저 기능을 갖는 휴대 단말기기.
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EP13744063.2A EP2811816A4 (en) | 2012-02-03 | 2013-02-04 | MAGNETIC FIELD SHIELDING SHEET FOR DIGITER, MANUFACTURING METHOD THEREOF, AND PORTABLE TERMINAL DEVICE USING THE SAME |
US14/371,787 US9507390B2 (en) | 2012-02-03 | 2013-02-04 | Magnetic field shielding sheet for digitizer, manufacturing method thereof, and portable terminal device using same |
JP2014555492A JP6268651B2 (ja) | 2012-02-03 | 2013-02-04 | デジタイザ用磁場遮蔽シートおよびその製造方法、並びにこれを利用した携帯端末機器 |
CN201380005878.8A CN104054409B (zh) | 2012-02-03 | 2013-02-04 | 数字转换器用磁场屏蔽薄片及制备方法和便携式终端设备 |
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KR1020120039998A KR101361771B1 (ko) | 2012-04-17 | 2012-04-17 | 자기장 차폐시트 및 그의 제조방법과 이를 이용한 휴대 단말기기 |
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CN104054409B (zh) | 2017-12-05 |
JP2015510695A (ja) | 2015-04-09 |
US9507390B2 (en) | 2016-11-29 |
JP6268651B2 (ja) | 2018-01-31 |
EP2811816A4 (en) | 2015-11-25 |
CN104054409A (zh) | 2014-09-17 |
EP2811816A1 (en) | 2014-12-10 |
US20140362505A1 (en) | 2014-12-11 |
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