KR101730792B1 - Sandwich type magnetic sheet - Google Patents

Sandwich type magnetic sheet Download PDF

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Publication number
KR101730792B1
KR101730792B1 KR1020150149855A KR20150149855A KR101730792B1 KR 101730792 B1 KR101730792 B1 KR 101730792B1 KR 1020150149855 A KR1020150149855 A KR 1020150149855A KR 20150149855 A KR20150149855 A KR 20150149855A KR 101730792 B1 KR101730792 B1 KR 101730792B1
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KR
South Korea
Prior art keywords
magnetic sheet
magnetic
antenna
wireless charging
sandwich
Prior art date
Application number
KR1020150149855A
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Korean (ko)
Inventor
이대희
김용선
백승재
정성길
Original Assignee
(주)우주일렉트로닉스
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Priority to KR1020150149855A priority Critical patent/KR101730792B1/en
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Publication of KR101730792B1 publication Critical patent/KR101730792B1/en

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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H02J17/00—
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present invention relates to a magnetic sheet on which a wireless charging antenna and a short-range wireless communication antenna are mounted. The magnetic sheet of the present invention is a sandwich type in which a second magnetic sheet is disposed in an inner space between a first magnetic sheet and a third magnetic sheet. As such, the magnetic sheet of the present invention is advantageous in that a magnetic sheet of a material optimized for a wireless charging antenna and a short-range wireless communication antenna is able to be disposed through a sandwich structure.

Description

[0001] The present invention relates to a sandwich type magnetic sheet,

TECHNICAL FIELD The present invention relates to a magnetic sheet, and more particularly, to a magnetic sheet used for collecting electromagnetic energy for short-range wireless communication and wireless charging, and a magnetic sheet having an overall structure of a sandwich shape.

Magnetic materials are widely used for electromagnetic wave shielding applications or EMI suppression of conductors. They have various kinds and characteristics depending on the synthesis of materials. In recent years, electromagnetic materials such as antennas, EMC cores, power inductors, broadband transformers, It is used for the purpose of focusing.

The magnetic body may be made thin in the form of a sheet. The magnetic sheet can be manufactured in various ways, one example of which is as follows. First, a powder is prepared by various methods such as a solid phase method and a wet method. Thereafter, the powder is mixed with a binder, a plasticizer, a dispersing agent or the like to prepare a slurry. The mixed slurry is applied thinly by using Doctor Blade Casting equipment or the like, dried, and further baked after drying.

The reason why the magnetic sheet is manufactured and used for RF parts and the like is that the magnetic material has a magnetic permeability characteristic. Since the permeability value of a magnetic material generally depends on the constituent components of the magnetic material and the manufacturing process, in order to change the permeability characteristic, it is necessary to change the composition of the raw material itself or to control various heat treatment temperatures in the manufacturing process come.

In the prior art, there has not been implemented a technique of causing the magnetic permeability values to differ only in a part of one magnetic sheet. However, recently, various RF parts having different functions in one magnetic sheet are mounted at the same time, It is necessary to adjust the permeability value only in a part of the magnetic sheet in order to apply the magnetic permeability value to each of these parts differently. In this case, when the wireless charging antenna and the short-range wireless communication antenna are simultaneously mounted, it is necessary not only to stack the magnetic sheets so as to satisfy various physical properties such as impedance, permeability, and direct current superimposition characteristic suited to the characteristics of each of the wireless charging antenna and the short- , Efforts have been made to increase the area and shape of the magnetic sheets in the multilayer structure instead of simply stacking the magnetic sheets in multiple layers.

For example, Patent Registration No. 10-1489391 entitled "soft magnetic sheet" discloses a technique of providing a soft magnetic sheet having a structure in which a first soft magnetic layer and a second soft magnetic layer are simply laminated, Patent No. 10-1513052 entitled " Hybrid Magnetic Sheet Combining Ultra-thin and High Permeability with WPC and NFC and Method for Manufacturing the Same ", as shown in FIG. 2, includes a first ribbon type magnetic sheet, an adhesive sheet, And a second ribbon-type magnetic sheet.

However, the above-mentioned patents and related art disclose a technology for a magnetic sheet having a structure in which magnetic sheets of different materials are simply stacked vertically or horizontally, A structure capable of variously combining magnetic sheets suitable for a charging antenna and a short-range wireless communication antenna has not been proposed.

Patent Registration No. 10-1489391 Patent Registration No. 10-1513052

A magnetic sheet capable of simultaneously mounting a wireless charging antenna and a short-range wireless communication antenna, the present invention aims to provide a novel magnetic sheet having a laminated structure that satisfies physical properties suitable for the two antennas.

In particular, the present invention aims to provide a structure capable of combining various magnetic sheets within a limited thickness.

In particular, it is an object of the present invention to provide a magnetic sheet capable of high-power wireless charging.

To achieve the above object, the present invention provides a sandwich-type magnetic sheet for mounting a wireless charging antenna and a short-range wireless communication antenna, the magnetic sheet comprising: a first magnetic sheet in contact with the antennas; A second magnetic sheet on the first magnetic sheet; And a third magnetic sheet on the second magnetic sheet, wherein at least two sides of the second magnetic sheet are located inside the space surrounded by the first magnetic sheet and the third magnetic sheet. Thereby providing a magnetic sheet.

In particular, it is preferable that the second magnetic sheet is surrounded by the first magnetic sheet and the third magnetic sheet and is not exposed to the outside at all.

In particular, the first magnetic sheet, the second magnetic sheet and the third magnetic sheet are preferably soft magnetic sheets.

In particular, it is preferable that the second magnetic sheet is disposed only on the upper portion of the wireless charging antenna, and is not positioned above the short-range wireless communication antenna.

In particular, it is preferable that at least two sides of the third magnetic sheet have an L-shaped folded portion bent in an L-shape, and the receiving portion of the L-shaped folded portion is in contact with the first magnetic sheet.

In particular, it is preferable that at least two sides of the third magnetic sheet have a straight bent portion bent in a straight line, and a bottom portion of the straight bent portion is in contact with the first magnetic sheet.

In particular, it is preferable that the first magnetic sheet further includes a projection protruding downward at a position corresponding to the wireless charging antenna.

Particularly, it is preferable that the protrusion is located in a coil (or pattern) inner space forming the wireless charging antenna.

In particular, it is preferable that the projecting portion is made of a magnetic material different from the first magnetic sheet.

In particular, it is preferable that the projecting portion is made of a soft magnetic metal powder sheet.

The present invention is characterized in that the magnetic sheet can be mixed in a limited thickness and area in comparison with the prior art. Particularly, according to the present invention, a wireless charging antenna is disposed below a second magnetic sheet of optimized material having an impedance characteristic, a magnetic permeability characteristic, a direct current superposition characteristic, and the like required for a wireless charging antenna, By placing only the magnetic sheet and the third magnetic sheet on the short-range wireless communication antenna, high-power wireless charging can be performed and the short-range communication efficiency can be improved.

In addition, by further providing a protruding portion having a disposition and a size so as to be positioned in the inner space portion formed by the coil constituting the wireless charging antenna, in particular, the wireless charging antenna, in the lower portion of the first magnetic sheet, One more effect can be obtained.

Further, when the protrusion is formed of a protrusion of a material, for example, a soft magnetic metal powder sheet, which can improve the direct current superimposition characteristic, which is the most necessary factor for high power wireless charging, high power wireless charging is possible.

1 and 2 are sectional views of a magnetic sheet according to the prior art.
3 is an exploded view of a magnetic sheet according to a first preferred embodiment of the present invention.
4 is a cross-sectional view of a magnetic sheet according to a first preferred embodiment of the present invention.
5 and 6 are perspective views of a first preferred embodiment of the present invention, wherein FIG. 5 is a partially closed type of the second magnetic sheet, and FIG. 6 is a view showing a fully closed structure of the second magnetic sheet.
7 is an exploded view of a magnetic sheet according to a second preferred embodiment of the present invention.
8 is a cross-sectional view of a magnetic sheet according to a second preferred embodiment of the present invention.
9 is a plan view of an antenna unit including a wireless charging antenna and a short-range wireless communication antenna.
FIGS. 10 and 11 are sectional views for explaining preferred sizes and positions of the second magnetic sheet at the time of coupling the magnetic sheet and the antenna portion of the first and second preferred embodiments of the present invention.
12 is a cross-sectional view of a magnetic sheet of a third preferred embodiment of the present invention.
13 is a cross-sectional view of a magnetic sheet of a fourth preferred embodiment of the present invention.

The present invention provides a sandwich-type magnetic sheet for mounting a wireless charging antenna and a short-range wireless communication antenna as means for realizing the above object. The magnetic sheet of the present invention comprises: a first magnetic sheet in contact with the antennas; A second magnetic sheet on the first magnetic sheet; And a third magnetic sheet on the second magnetic sheet, wherein the second magnetic sheet has a smaller area than the first magnetic sheet and the third magnetic sheet, and the second magnetic sheet has a smaller area than the first magnetic sheet and the third magnetic sheet, Wherein at least two parallel sides of the second magnetic sheet are disposed in a space surrounded by the second magnetic sheet.

The present invention is characterized in that the second magnetic sheet has a "sandwich" structure of the first magnetic sheet and the third magnetic sheet as described above. The sandwich-type structure is advantageous in that a magnetic sheet having physical properties suitable for the wireless charging antenna and the short-range wireless communication antenna located below can be disposed above each antenna.

Further, it is specified that the magnetic sheet of the present invention is applicable to both the transmitting end and the receiving end.

Hereinafter, the present invention will be described in detail with reference to the drawings.

3 and 4 are an exploded view and an engaging sectional view of the magnetic sheet 100 according to the first preferred embodiment of the present invention. The magnetic sheet 100 according to the first preferred embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG.

The magnetic sheet 100 according to the first embodiment of the present invention has the first magnetic sheet 10, the second magnetic sheet 20 and the third magnetic sheet 30 (see FIG. 9) ) Are stacked. The third magnetic sheet 20 may be a magnetic sheet having different physical properties, but in particular, the second magnetic sheet 20 may have physical properties suitable for the wireless charging antenna 2 (see FIG. 9) (for example, Or the like) is preferably used.

The first magnetic sheet 10, the second magnetic sheet 20 and the third magnetic sheet 30 are preferably made of a conventional soft magnetic sheet. Since the soft magnetic sheet is a well-known technology, detailed description of materials, characteristics and the like will be omitted in the present invention.

As shown in FIG. 5, the quadrangular second magnetic sheet 20 can be sandwiched even when only two parallel sides parallel to each other by the first magnetic sheet 10 and the third magnetic sheet 30 are surrounded, Likewise, all four sides of the second magnetic sheet 20 may not be exposed at all by being surrounded by the first magnetic sheet 10 and the third magnetic sheet 30.

Although not shown in the drawing, a magnetic sheet may be further provided on the third magnetic sheet 30 if necessary. The technical feature of the present invention is that the second magnetic sheet 20 is disposed on the first magnetic sheet 10 And the third magnetic sheet 30 to form a sandwich type as a whole. Therefore, until the magnetic sheet is further provided, the right of the present patent is clearly indicated .

Referring to FIG. 4, the third magnetic sheet 30 includes an L-shaped bent portion 31, which covers the second magnetic sheet 20 in an upper portion thereof and in which each side of the third magnetic sheet 30 is bent in an L- And the receiving portion 32 at the lower portion of the L-shaped bent portion 31 is bonded to the first magnetic sheet 10. Of course, when only two parallel sides of the rectangular second magnetic sheet 20 are located in the space formed by the first magnetic sheet 10 and the third magnetic sheet 30 and are not exposed to the outside, The L-shaped bent portion 31 of the magnetic sheet 30 can also have only two sides.

7 and 8 are an exploded view and an engaging sectional view of a magnetic sheet 200 according to a second preferred embodiment of the present invention. The magnetic sheet 200 according to the second preferred embodiment of the present invention will be described in detail with reference to FIGS. 7 and 8. FIG.

The basic structure of the magnetic sheet 200 according to the second preferred embodiment of the present invention is the same as that of the magnetic sheet 100 of the first embodiment described above. That is, the second magnetic sheet 20 has a relatively small area, and is located in a space formed by the first magnetic sheet 10 and the third magnetic sheet 40 to form a sandwich structure as a whole . However, each side of the third magnetic sheet 40 is not bent into an L-shape but has a linear bent portion 41 instead. Only the bottom portion 42, which is a portion of the straight bent portion 41 that is in contact with the first magnetic sheet 10, is bonded to the first magnetic sheet 10. The horizontal width of the bottom portion 42 of the magnetic sheet 200 of the second embodiment is preferably substantially the same as or substantially the same as the horizontal width of the receiving portion 32 of the magnetic sheet 100 of the first embodiment.

The common features of the magnetic sheets 100 and 200 of the first preferred embodiment and the second preferred embodiment described above are that the second magnetic sheet 20 is disposed between the first magnetic sheet 10 and the third magnetic sheet 30, and 40 form a so-called enveloped sandwich structure. Advantages of such a sandwich structure will be described in detail with reference to FIGS.

9 is a plan view of the antenna unit 1 mounted (joined or laminated) on the magnetic sheet of the present invention. The antenna unit 1 includes a wireless charging antenna 2 having a plurality of coils (or patterns) wound around the center of the substrate 4 and a short-range wireless communication antenna 3 ). A roughly rectangular space inside the coil (or pattern) of the wireless charging antenna 2 will be referred to as an inner space 5 and a protruding portion 50 (see Figs. 12 and 13) ), Which will be described in detail with reference to the other drawings.

10 is a cross-sectional view of the magnetic sheet 100 of the first preferred embodiment of the present invention in a state in which it is engaged with the antenna portion 1. FIG. The preferred size and arrangement of the second magnetic sheet 20 will be described with reference to FIG.

In the case of the antenna unit 1 using the wireless charging antenna 2 and the short-range wireless communication antenna 3 together, the frequency band used for the wireless charging and the short-range wireless communication are different from each other, In this case, the wireless power can be recharged at a higher power than in the case of using it. However, if the magnetic material for improving the efficiency of short range wireless communication is used, , It is necessary to arrange the magnetic sheets appropriately in order to secure necessary physical properties for both the antennas 2 and 3. [

In the present invention, in order to arrange the second magnetic sheet 20 made of a material capable of improving the direct current superimposition characteristic so as to enable high-power wireless charging, the second magnetic sheet In the region B where the short-range wireless communication antenna 3 is located so as to set the size and the placement position such that the short-range wireless communication antenna 3 is positioned so as not to affect the short-range wireless communication due to the second magnetic sheet 20, It is preferable that only two sheets of the one magnetic sheet 10 and the third magnetic sheet 30 are located. Due to the arrangement of the magnetic sheets as described above, the magnetic sheet 100 of the present invention affects mainly the short-range wireless communication antenna 3 by the laminated sheet composed of the first magnetic sheet 10 and the third magnetic sheet 30 Receiving efficiency of the short range wireless communication antenna 3 can be increased by appropriately selecting the material of the first magnetic sheet 10 and the third magnetic sheet 30 while being not affected by the second magnetic sheet 20. [

11 is a cross-sectional view of a magnetic sheet 200 according to a second preferred embodiment of the present invention in a state in which it is engaged with the antenna portion 1. Fig. 10, the second magnetic sheet 20 is sized and arranged so as to be located only above the region A where the wireless charging antenna 2 is located, and the magnetic sheet 200 of the second embodiment, It is preferable that the short-range wireless communication antenna 3 is positioned below the region B where the first magnetic sheet 10 and the third magnetic sheet 40 meet.

12 is a sectional view of a magnetic sheet 300 according to a third embodiment of the present invention, and is shown together with the antenna unit 1 for convenience of explanation. The magnetic sheet 300 according to the third embodiment of the present invention is an embodiment in which the protrusions 50 are further added in the magnetic sheet 100 according to the first embodiment.

The magnetic sheet 300 of the third embodiment of the present invention further includes a protruding portion 50 below the first magnetic sheet 10 in the direction of the antenna portion 1, 2) in the inner space 5 between the coils (or patterns). The provision of the protruding portion 50 not only provides the effect of disposing the fourth magnetic sheet in the same space, unlike the stacked magnetic sheet in the related art, but also provides the second magnetic sheet 20 The magnetic sheet of the material optimized for the wireless charging antenna 2 can be used as the material of the projecting portion 50, so that power transmission and reception of high power can be performed.

The protrusion 50 may be a magnetic sheet of the same material as the first magnetic sheet 10, but is preferably made of a soft magnetic metal powder. The soft magnetic metal powder sheet is a material that is already known as a material having an excellent effect of improving the direct current superimposition characteristic in the field of inductors. By applying the soft magnetic metal powder material to the magnetic sheet 300 also to the protrusions 50, It is possible.

It is also preferable that the size (or area) of the protruding portion 50 is substantially the same or slightly smaller than the size to be fitted into the internal space of the wireless charging antenna 2. This can maximize the size of the protruding portion 50, enabling high-power wireless charging.

13 is a sectional view of a magnetic sheet 400 according to a fourth preferred embodiment of the present invention in which the magnetic sheet 200 according to the second embodiment further includes a protruding portion 50 under the first magnetic sheet 10 The magnetic sheet 300 according to the third embodiment is the same as the magnetic sheet 300 according to the third embodiment.

1: Antenna part 2: Wireless charging antenna
3: short-range wireless communication antenna 4: substrate
5: inner space 10: first magnetic sheet
20: second magnetic sheet 30, 40: third magnetic sheet
31: L-shaped bent portion 32:
41: straight bent portion 42: bottom portion
50: protrusions 100, 200, 300: magnetic sheet

Claims (10)

A sandwich-type magnetic sheet for mounting a wireless charging antenna and a short-range wireless communication antenna,
The magnetic sheet comprises:
A first magnetic sheet in contact with the antennas;
A second magnetic sheet on the first magnetic sheet; And
And a third magnetic sheet on the second magnetic sheet,
And the second magnetic sheet is surrounded by all the sides of the first magnetic sheet and the third magnetic sheet and is not exposed to the outside at all.
A sandwich-type magnetic sheet for mounting a wireless charging antenna and a short-range wireless communication antenna,
The magnetic sheet comprises:
A first magnetic sheet in contact with the antennas;
A second magnetic sheet on the first magnetic sheet; And
And a third magnetic sheet on the second magnetic sheet,
Wherein at least two sides of the second magnetic sheet are located in a space surrounded by the first magnetic sheet and the third magnetic sheet,
Wherein at least two sides of said third magnetic sheet have an L-shaped bent portion bent in an L-shape, and a bearing portion of said L-shaped bent portion is in contact with said first magnetic sheet.
A sandwich-type magnetic sheet for mounting a wireless charging antenna and a short-range wireless communication antenna,
The magnetic sheet comprises:
A first magnetic sheet in contact with the antennas;
A second magnetic sheet on the first magnetic sheet; And
And a third magnetic sheet on the second magnetic sheet,
Wherein at least two sides of the second magnetic sheet are located in a space surrounded by the first magnetic sheet and the third magnetic sheet,
Wherein at least two sides of the third magnetic sheet have a straight bent portion bent in a straight shape and a bottom portion of the straight bent portion is in contact with the first magnetic sheet.
A sandwich-type magnetic sheet for mounting a wireless charging antenna and a short-range wireless communication antenna,
The magnetic sheet comprises:
A first magnetic sheet in contact with the antennas;
A second magnetic sheet on the first magnetic sheet; And
And a third magnetic sheet on the second magnetic sheet,
Wherein at least two sides of the second magnetic sheet are located in a space surrounded by the first magnetic sheet and the third magnetic sheet,
Wherein the first magnetic sheet further has a protruding portion protruding downward at a position corresponding to the wireless charging antenna of the first magnetic sheet.
The sandwich-type magnetic sheet according to claim 4, wherein the protruding portion is located in a coil inner space forming the wireless charging antenna.
The sandwich-type magnetic sheet according to claim 4, wherein the projecting portion is made of a magnetic material different from the first magnetic sheet.
The sandwich-type magnetic sheet according to claim 6, wherein the protruding portion is made of a soft magnetic metal powder sheet.
The sandwich-type magnetic sheet according to any one of claims 1 to 7, wherein the first magnetic sheet, the second magnetic sheet and the third magnetic sheet are soft magnetic sheets.
The sandwich-type magnetic sheet according to any one of claims 1 to 7, wherein the second magnetic sheet is disposed only at an upper portion of the wireless charging antenna and not positioned above the short-range wireless communication antenna. delete
KR1020150149855A 2015-10-28 2015-10-28 Sandwich type magnetic sheet KR101730792B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010041906A (en) 2008-07-10 2010-02-18 Nec Tokin Corp Contactless power transmission apparatus, soft magnetic sheet, and module using the same
KR101394508B1 (en) 2013-03-22 2014-05-13 엘지이노텍 주식회사 Soft magnetism sheet, wireless power receiving apparatus and wireless charging method of the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010041906A (en) 2008-07-10 2010-02-18 Nec Tokin Corp Contactless power transmission apparatus, soft magnetic sheet, and module using the same
KR101394508B1 (en) 2013-03-22 2014-05-13 엘지이노텍 주식회사 Soft magnetism sheet, wireless power receiving apparatus and wireless charging method of the same

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