KR20220149952A - Magnetic field shielding sheet for portable device and portable device having the same - Google Patents

Abstract

The present invention relates to a magnetic field shielding sheet for a portable terminal and the portable terminal equipped with the same, wherein at least one shielding sheet may be disposed between a digitizer and a folding plate or between the folding plate and a support plate to shield the magnetic field for the digitizer. Therefore, the present invention is capable of enabling a malfunction to be prevented from occurring.

Description

Magnetic field shielding sheet for a mobile terminal and a mobile terminal having the same

The present invention relates to a magnetic field shielding sheet for a portable terminal and a portable terminal having the same, and more particularly, to a magnetic field shielding sheet for a portable terminal that minimizes the effect of a magnetic field on a digitizer, and a portable terminal having the same.

In general, a mobile terminal refers to a terminal, such as a mobile phone, that a user can use while moving. Among mobile phones, the foldable phone uses a flexible OLED display so that the screen can be folded. A foldable phone can improve portability through the folding process and has the advantage of being able to use it as a wide screen when unfolded.

The foldable phone may be provided with a hinge unit to fold or unfold the display screen. The hinge part is connected to the hinge shaft and has a hinge plate that rotates about the hinge shaft, and the hinge plate is made of a stainless steel material, which is light in weight and excellent in rigidity to ensure robustness and safety.

However, when a magnetic field is generated by an external magnetic field or the like in the hinge plate made of stainless steel, the magnetic field may affect the digitizer and deteriorate performance. That is, the magnetic field interferes with the interaction between the electronic pen and the digitizer, thereby making it difficult to accurately detect the position of the electronic pen and causing a malfunction.

It is an object of the present invention to provide a magnetic field shielding sheet for a portable terminal having a magnetic field shielding effect to minimize the effect of a magnetic field generated from a hinge plate of a hinge on a digitizer, and a portable terminal having the same.

A portable terminal according to an embodiment of the present invention for achieving the above object includes a digitizer, a folding plate disposed under the digitizer, and a folding plate disposed under the folding plate, and provided with a hinge portion to support folding and unfolding A portable terminal including a plate, comprising at least one shielding sheet for shielding a magnetic field with respect to a digitizer, and the shielding sheet may be disposed between the digitizer and the folding plate or between the folding plate and the support plate.

The shielding sheet may include a first shielding sheet and a second shielding sheet disposed at a position corresponding to the hinge part to shield a magnetic field generated in the hinge part.

The support plate includes a first support plate and a second support plate disposed on both sides of the hinge part, and the hinge part includes a first hinge plate connected to the first support plate and a second hinge plate connected to the second support plate. and the first hinge plate and the second hinge plate are rotatably connected about a hinge axis, and the first shielding sheet and the second shielding sheet are disposed at positions corresponding to the first hinge plate and the second hinge plate. can

The first shielding sheet and the second shielding sheet may be disposed on both sides at a distance from the hinge axis.

The first hinge plate and the second hinge plate are provided in plurality at intervals along the longitudinal direction of the hinge axis, and the first shielding sheet is provided in plurality and disposed at positions corresponding to each of the first hinge plates, the second shielding sheet may be provided in plurality and disposed at positions corresponding to each of the second hinge plates.

The folding plate includes a first metal sheet having a folding part to be folded, a second metal sheet and a third metal sheet bonded to both sides of the first metal sheet, wherein the first shielding sheet and the second shielding sheet are digitizers and the first metal sheet or between the first metal sheet and the hinge unit. Here, the first metal sheet may be formed of a stainless material.

The mobile terminal of the present invention is disposed under the support plate and further includes a pair of magnets provided at positions opposite to each other in the folded state of the support plate, and the shielding sheet is disposed at a position corresponding to the pair of magnets. It may further include a third shielding sheet for shielding the magnetic field generated by the pair of magnets.

The third shielding sheet may be made of a material having a lower magnetic permeability than the first shielding sheet and the second shielding sheet.

The portable terminal of the present invention is disposed under the support plate and further includes a circuit board provided with at least one sensor, and the shielding sheet is disposed at a position corresponding to the sensor to shield the magnetic field generated by the sensor. It may further include a shielding sheet.

The fourth shielding sheet may be made of a material having a lower magnetic permeability than the first shielding sheet and the second shielding sheet.

The mobile terminal of the present invention may further include a height difference compensating sheet formed to a thickness corresponding to the shielding sheet and compensating for the height difference by the shielding sheet.

A magnetic field shielding sheet for a mobile terminal according to an embodiment of the present invention includes a digitizer, a folding plate disposed under the digitizer, and a support plate disposed under the folding plate and provided with a hinge portion to enable folding and unfolding. A magnetic field shielding sheet for a terminal, provided with at least one shielding sheet for shielding a magnetic field with respect to a digitizer, and the shielding sheet may be disposed between the digitizer and the folding plate or between the folding plate and the support plate.

The shielding sheet may be a magnetic member having a saturation magnetic flux density (Bs) of 1.7T or more, and may be formed to a thickness of 0.1 mm to 0.2 mm.

The shielding sheet may include silicon steel.

The shielding sheet may be a multi-layer sheet in which a shielding layer including a silicon steel, and at least one ribbon sheet layer of a ribbon sheet of an amorphous alloy and a ribbon sheet of a nano-crystalline alloy are laminated.

According to the present invention, since the first shielding sheet and the second shielding sheet are disposed between the digitizer and the hinge part, a magnetic field generated in the hinge part affects the digitizer, thereby preventing malfunction.

In addition, in the present invention, the first shielding sheet and the second shielding sheet have a saturation magnetic flux density (Bs) of 1.7T or more, and are formed to a thickness of 0.1 mm to 0.2 mm or less, so that even if a large magnetic field is applied to the hinge part from the outside, the first and the shielding properties of the second shielding sheet are not significantly deteriorated.

In addition, the present invention can improve the insufficient shielding performance of the polymer shielding sheet provided on the lower surface of the existing digitizer by efficiently disposing the shielding sheet capable of increasing the shielding performance at a specific position.

1 is a diagram illustrating an in-folding type foldable phone in which a display is folded inward around a vertical axis as an example of a portable terminal.
2 is a cross-sectional view illustrating a portable terminal according to an embodiment of the present invention.
FIG. 3 is an exploded cross-sectional view of the portable terminal of FIG. 2 .
4 is a magnetic field distribution diagram measured in a state in which first and second shielding sheets including silicon steel are placed on the hinge, and Nd magnets are applied on the first and second shielding sheets for 5 minutes and then measured in a state of removal A diagram showing a magnetic field distribution diagram.
5 is a plan view illustrating a support plate, a hinge unit, a first shielding sheet and a second shielding sheet in the mobile terminal of FIG. 2 .
6 is a cross-sectional view illustrating a modified example of a portable terminal according to an embodiment of the present invention.
7 is an exploded cross-sectional view illustrating the modified example of FIG. 6 .
8 is an exploded cross-sectional view of a portable terminal according to another embodiment of the present invention.
9 is a plan view illustrating a support plate, a hinge unit, and first to fourth shielding sheets in the mobile terminal of FIG. 8 .
10 is an exploded cross-sectional view illustrating a modified example of the mobile terminal of FIG. 8 .

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

1 is a diagram illustrating an in-folding type foldable phone in which a display is folded inward about a vertical axis as an example of a portable terminal, and FIG. 2 is a cross-sectional view illustrating a portable terminal according to an embodiment of the present invention, FIG. 3 is an exploded cross-sectional view of the mobile terminal of FIG. 2 , and FIG. 4 is a plan view illustrating the housing, the hinge unit, the first shielding sheet and the second shielding sheet in the mobile terminal of FIG. 2 .

As shown in FIG. 1 , in the portable terminal 100 according to an embodiment of the present invention, the left and right sides of the display 120 disposed on the front of the housing 110 are folded inward around a vertical axis a. A folding-type foldable phone will be described as an example. The foldable phone may include a secondary display 121 that is viewed in a folded state. The display 120 may be an OLED. Meanwhile, the portable terminal 100 according to an embodiment of the present invention is not limited to an in-folding type foldable phone, and may be a clam shell type flip phone that is folded in the width direction.

2 and 3 , in the portable terminal 100 , the digitizer 130 may be provided under the display 120 . Here, the digitizer 130 may be coupled to or disposed adjacent to the lower surface of the display 120 .

The digitizer 130 is a thin metal film, and when electricity flows therein, an electromagnetic field is created. The electronic pen (not shown) is provided with a miniature antenna coil generating an alternating magnetic field at an end thereof. Therefore, when the end of the electronic pen approaches the display 120, electromagnetic induction occurs and a deformation occurs in the electromagnetic field of the digitizer 130 disposed on the rear surface of the display 120, and the deformation of the magnetic field causes the digitizer 130 It can be detected through a controller (not shown) to recognize X, Y coordinates and recognize the operation of the electronic pen.

Also, although not shown, a thin polymer shielding sheet (not shown) may be provided on the entire lower surface of the digitizer 130 . Such a polymer shielding sheet is mainly formed of a metal and a polymer composite having a shielding function, but such a shielding sheet has a problem in that the shielding performance is inferior when shielding a magnetic field with respect to a digitizer. On the other hand, the mobile terminal 100 according to the embodiment of the present invention can improve the insufficient shielding performance of the polymer shielding sheet provided on the lower surface of the existing digitizer by efficiently disposing the shielding sheet capable of increasing the shielding performance at a specific location. There are advantages. The shielding sheet of the present invention will be described in detail below.

The folding plate 140 may include a first metal sheet 141 , a second metal sheet 142 , and a third metal sheet 143 . The folding plate 140 may have a shape in which the first metal sheet 141 connects between the second metal sheet 142 and the third metal sheet 143 . In this case, upper surfaces of the first metal sheet 141 , the second metal sheet 142 , and the third metal sheet 143 may form the same plane.

The first metal sheet 141 is to perform a supporting function and a folding function of the display 11 , and a mesh-shaped folding unit 141a is formed in the center portion and may be provided to be folded or unfolded. . The first metal sheet 141 is made of a metal material having rigidity for elasticity and support function. The folding part 141a of the first metal sheet 141 may be formed by photo-etching. In this case, the first metal sheet 141 is preferably made of stainless steel. This is because the stainless material has good etchability while being rigid.

In addition, in the folding plate 140 , a flat second metal sheet 142 and a third metal sheet 143 may be bonded to both sides of the first metal sheet 141 . The second metal sheet 142 and the third metal sheet 143 may be formed of a copper alloy material having high strength and high heat dissipation, or may be formed of a copper material.

In this way, the folding plate 140 is easily folded or unfolded through the first metal sheet 141 on which the folding part 141a is formed, and is displayed through the second metal sheet 142 and the third metal sheet 143 . 120 and the digitizer 130 may be supported so as not to be wrinkled.

As described above, since the folding plate 140 includes the first metal sheet 141 made of stainless material, when a magnetic field is generated by an external magnetic field in the first metal sheet 141 made of stainless material, the magnetic field is generated by the digitizer 130 . may affect and degrade performance. Accordingly, the first shielding sheet 10 and the second shielding sheet 20 are disposed between the digitizer 130 and the first metal sheet 141 or between the first metal sheet 141 and the hinge unit 160 . desirable. That is, the first shielding sheet 10 and the second shielding sheet 20 may be arranged to minimize the influence of the magnetic field generated in the first metal sheet 141 made of stainless steel on the digitizer 130 . In addition, the first shielding sheet 10 and the second shielding sheet 20 are preferably disposed on both sides at a distance from the center of the folding part 141a so as not to interfere with the folding and unfolding operation of the folding part 141a. .

The mobile terminal 100 may include a support plate 170 . The support plate 170 is disposed under the folding plate 140 , and a hinge part 160 is provided to enable folding and unfolding.

The support plate 170 may include a first support plate 171 and a second support plate 172 disposed on both sides of the hinge unit 160 .

The hinge unit 160 may include a first hinge plate 161 connected to the first support plate 171 and a second hinge plate 162 connected to the second support plate 172 . Since the first and second hinge plates 161 and 162 are rotatably connected about the hinge shaft 163 , the first and second support plates 171 and 172 connected to the first and second hinge plates 161 and 162 are also hinged. It may be rotated about the axis 163 to be in a folded state facing each other or may be in an unfolded state.

In this way, the first hinge plate 161 and the second hinge plate 162 rotate about the hinge shaft 163 in a state connected to the first and second support plates 171 and 172 to be in a folded or unfolded state. Therefore, it is important to secure robustness and stability. Therefore, it is preferable that the first and second hinge plates 161 and 162 are made of a stainless steel material having a light weight and excellent rigidity.

However, when the magnetic field generated by the first and second hinge plates 161 and 162 made of stainless steel affects the digitizer 130 , the performance of the digitizer 130 is deteriorated. That is, since the first and second hinge plates 161 and 162 rotate about the hinge shaft 163 and the folded state and the unfolded state opposite to each other are repeated parts, they are magnetized to form a magnetic field of a certain level or more around the digitizer 130. can In addition, even when a large magnetic field such as an Nd magnet is applied to the hinge unit 160 , the first and second hinge plates 161 and 162 have magnetism, so that a magnetic field of a certain level or more may be formed around the digitizer 130 . This magnetic field interferes with the interaction between the electronic pen and the digitizer 130, making it difficult to accurately detect the position of the electronic pen. causes

Therefore, the magnetic field shielding sheet for a mobile terminal according to an embodiment of the present invention is disposed at a position corresponding to the hinge unit 160 to prevent the magnetic field generated from the hinge unit 160 from affecting the digitizer 130 . It may include a first shielding sheet 10 and a second shielding sheet 20 so that the

Specifically, the first shielding sheet 10 and the second shielding sheet 20 are disposed at positions corresponding to the first hinge plate 161 and the second hinge plate 162 , and are spaced apart from each other to the digitizer 130 . The magnetic field generated by the hinge unit 160 may be shielded.

2 and 3 , the first shielding sheet 10 and the second shielding sheet 20 may be disposed between the folding plate 140 and the support plate 170 . Here, the first and second shielding sheets 10 and 20 may be in the form of sheets attachable to the lower surface of the folding plate 140 by an adhesive layer (not shown). In addition, the adhesive layer may be provided with an adhesive, tape, etc. applied to one or both surfaces of the first and second shielding sheets 10 and 20 .

Since the folding plate 140 is disposed between the digitizer 130 and the support plate 170 , the first and second shielding sheets 10 and 20 disposed between the folding plate 140 and the support plate 170 are supported. The magnetic field generated by the hinge unit 160 provided on the plate 170 may block the magnetic field before it affects the digitizer 130 .

On the other hand, the height difference compensating sheet 30 is formed with a thickness corresponding to the first shielding sheet 10 and the second shielding sheet 20 , and is formed by the first shielding sheet 10 and the second shielding sheet 20 . The height difference can be compensated.

Specifically, as shown in FIGS. 2 and 3 , the folding plate 140 and the support plate 170 are spaced apart from each other by the thickness of the first shielding sheet 10 and the second shielding sheet 20 . height difference occurs. Therefore, when the height difference compensating sheet 30 is provided, it is possible to compensate for the height difference generated by the thickness of the first shielding sheet 10 and the second shielding sheet 20 so that a gap between the components does not occur. . The height difference compensating sheet 30 may be provided with a tape or the like.

The first shielding sheet 10 and the second shielding sheet 20 may be provided with a magnetic member having a saturation magnetic flux density (Bs) of 1.7T or more. As such, when the saturation magnetic flux density (Bs) of the first and second shielding sheets 10 and 20 is as high as 1.7T or more, magnetic saturation by the magnetic field generated in the hinge unit 160 may be delayed, and thus Due to this, it is possible to manufacture in a thin sheet type having a thickness of 0.1 mm to 0.2 mm or less compared to a shielding sheet having a low saturation magnetic flux density (Bs). If the thickness of the first shielding sheet 10 and the second shielding sheet 20 is less than 0.1 mm, the shielding properties may be deteriorated, and if the thickness exceeds 0.2 mm, it is difficult to manufacture the mobile terminal 100 thin. It is preferably formed to a thickness of 0.1 mm to 0.2 mm or less.

The first shielding sheet 10 and the second shielding sheet 20 may include silicon steel, which is a high magnetic permeability material with high magnetic permeability. When the first shielding sheet 10 and the second shielding sheet 20 are formed to include silicon steel, magnetic permeability for shielding a magnetic field may be increased.

4 is a magnetic field distribution (a) measured in a state in which the first and second shielding sheets 10 and 20 including silicon steel are disposed on the hinge unit 160, and first and second shielding including silicon steel. It is a view showing the magnetic field distribution (b) measured in the state in which the Nd magnet is applied and removed on the sheets 10 and 20 for 5 minutes.

As shown in FIG. 4 , the first and second shielding sheets 10 and 20 including silicon steel are formed to a thin thickness of 0.15 mm, and the magnetic field distribution diagram (a) before the Nd magnet is applied and the Nd magnet are applied. After that, the magnetic field distribution (b) did not change significantly. That is, it can be confirmed that the first and second shielding sheets 10 and 20 according to the present invention do not significantly deteriorate the shielding properties even when a large external magnetic field such as an Nd magnet is applied.

On the other hand, although not shown, the first shielding sheet 10 and the second shielding sheet 20 is a shielding layer (not shown) containing a silicon steel (silicon steel), an amorphous alloy ribbon sheet and nano-crystalline alloy At least one of the ribbon sheets of the ribbon sheet layer (not shown) may be provided as a laminated hybrid-type multi-layer sheet. Here, the ribbon sheet is a ribbon sheet made of a Fe-based nano-crystalline magnetic alloy is used, or Fe-Si-B, Fe-Si-B-Co, Fe-Si-B-Cu-Nb, Fe-Zr-B, etc. Fe-based amorphous alloy ribbon sheet having a composition may be used. In addition, the multi-layer sheet may be in a form in which a plurality of shielding layers and a plurality of ribbon sheet layers are stacked.

In the case of a single nano-ribbon and iron-based ribbon, even when laminated, the volume is reduced compared to a material that can be manufactured to a certain thickness, such as silicon steel, and the saturation magnetic flux density is also in the first and second shielding sheets (10) of the present invention. ,20) is within the range of about 1.2T. On the other hand, when the first and second shielding sheets 10 and 20 are provided as a multi-layer sheet in which a shielding layer containing silicon steel and a ribbon sheet layer are laminated, it is shielded more than a shielding sheet using a single manufactured nano-ribbon or iron-based ribbon. There is no significant deterioration in the function of the characteristic.

On the other hand, the first and second shielding sheets 10 and 20 may be formed of a material containing silicon steel, or may be formed of a multi-layer sheet in which a shielding layer and a ribbon sheet layer containing silicon steel are laminated. However, the material of the first and second shielding sheets 10 and 20 is not limited thereto, and may be formed of various materials having a saturation magnetic flux density of 1.7T and a thickness of 0.1 mm to 0.2 mm or less.

5 is a plan view illustrating a housing, a hinge unit, a first shielding sheet, and a second shielding sheet in the mobile terminal of FIG. 2 .

As shown in FIG. 5 , the first shielding sheet 10 and the second shielding sheet 20 may be disposed on both sides at a distance from the hinge shaft 163 . For example, each of the first and second shielding sheets 10 and 20 is disposed on both sides with an interval of about 2 mm from the hinge shaft 163 , and between the first shielding sheet 10 and the second shielding sheet 20 . A space of about 4 mm may be formed. This space is to prevent the first and second shielding sheets 10 and 20 from interfering with the folding and unfolding operations of the hinge unit 160 about the hinge shaft 163 .

In addition, the first hinge plate 161 and the second hinge plate 162 may be provided in plurality at intervals along the length direction of the hinge shaft 163 . For example, as shown in FIG. 5 , a pair of each of the first hinge plate 161 and the second hinge plate 162 may be provided. As such, when the first and second hinge plates 161 and 162 are provided in plurality, the first shielding sheet 10 is provided in plurality and disposed at positions corresponding to each of the first hinge plates 161, and the second A plurality of shielding sheets 20 may be provided to be disposed at positions corresponding to each of the second hinge plates 162 . That is, the plurality of first and second shielding sheets 10 and 20 may be disposed to prevent magnetic fields generated from the plurality of first and second hinge plates 161 and 162 from affecting the digitizer 130 .

6 is a cross-sectional view illustrating a modified example of a mobile terminal according to an embodiment of the present invention, and FIG. 7 is an exploded cross-sectional view illustrating a modified example of the mobile terminal according to an embodiment of the present invention.

As shown in FIGS. 6 and 7 , the first shielding sheet 10 , the second shielding sheet 20 and the height difference compensating sheet 30 may be disposed between the digitizer 130 and the folding plate 140 . have. Like the example shown in FIGS. 2 and 3 , the first and second shielding sheets 10 and 20 may be in the form of a sheet attachable to the upper surface of the folding plate 140 by an adhesive layer (not shown), and compensation for height difference The sheet 30 may be provided so that a gap does not occur between the digitizer 130 and the folding plate 140 .

Since the folding plate 140 is disposed between the digitizer 130 and the support plate 170 , the first and second shielding sheets 10 and 20 disposed between the digitizer 130 and the folding plate 140 are the support plates. The magnetic field generated by the hinge unit 160 provided in the 170 and the first metal sheet 141 of the folding plate 140 may block the magnetic field before it affects the digitizer 130 .

Hereinafter, a mobile terminal according to another embodiment of the present invention will be described with reference to FIGS. 8 to 10 . For convenience of description, descriptions of the same components as those of the embodiment shown in FIGS. 1 to 7 will be omitted, and differences will be mainly described below.

8 and 9 , in the portable terminal 100 ′ according to another embodiment of the present invention, a pair of magnets m may be disposed under the support plate 170 ′. The pair of magnets m are permanent magnets disposed in the edge region, and may be disposed at positions opposite to each other in the folded state of the support plate 170 ′. That is, in a state where the first support plate 171 ′ and the second support plate 172 ′ face each other, the pair of magnets m may be disposed at positions facing each other. In FIG. 8 , an example in which a pair of magnets m is provided on a circuit board c to be described later is illustrated, but the present invention is not limited thereto. And it may be provided on the lower surface of the second support plate (172'). In addition, the pair of magnets m may be formed in different sizes as shown in FIGS. 8 to 10 , or may be formed in the same size as each other.

The attractive force between the pair of magnets m corresponds to the elasticity of the folding plate 140' (the restoring force that the folding part 141a' of the folding plate 140' tries to unfold in the folded state) to maintain the folded state. can When the magnetic field generated by the pair of magnets m affects the digitizer 130 , errors such as liquid crystal input recognition or frequency shift may occur when input through the electronic pen. Accordingly, the mobile terminal 100' according to another embodiment of the present invention may include a third shielding sheet 40' disposed at a position corresponding to the pair of magnets m. The third shielding sheet 40 ′ may shield the magnetic field generated by the pair of magnets m with respect to the digitizer 130 . The third shielding sheet 40' is formed of a material containing silicon steel like the first and second shielding sheets 10' and 20', or a multilayer in which a shielding layer and a ribbon sheet layer containing silicon steel are laminated. It may be formed of a sheet, but the material of the third shielding sheet 40 ′ is not limited thereto.

For example, the third shielding sheet 40' may have a magnetic permeability of 200, and the first and second shielding sheets 10' and 20' may be formed of a material having a magnetic permeability of 7000. That is, the third shielding sheet 40' may be made of a material having a lower magnetic permeability than the first and second shielding sheets 10' and 20'.

In addition, in the portable terminal 100 ′ according to another embodiment of the present invention, a circuit board c may be disposed under the support plate 170 ′. The circuit board (c) may be provided with at least one sensor (s). The portable terminal 100 ′ may include a fourth shielding sheet 50 ′ for shielding a magnetic field generated from at least one sensor s with respect to the digitizer 130 ′. The fourth shielding sheet 50 ′ prevents the magnetic field generated by the at least one sensor s from affecting the digitizer 130 ′, thereby preventing errors due to the magnetic field. The fourth shielding sheet 50' is formed of a material containing silicon steel like the first and second shielding sheets 10' and 20', or a multilayer in which a shielding layer and a ribbon sheet layer containing silicon steel are laminated. It may be formed of a sheet, but the material of the fourth shielding sheet 50 ′ is not limited thereto.

For example, the fourth shielding sheet 50' may have a magnetic permeability of 2000, and the first and second shielding sheets 10' and 20' may be formed of a material having a magnetic permeability of 7000. That is, the fourth shielding sheet 50' may be made of a material having a lower magnetic permeability than the first and second shielding sheets 10' and 20'.

On the other hand, the height difference compensating sheet 30' has a thickness corresponding to the first shielding sheet 10', the second shielding sheet 20', the third shielding sheet 40', and the fourth shielding sheet 50'. is formed, and may be provided to compensate for a height difference caused by the first to fourth shielding sheets 10', 20', 40', and 50'.

In this way, when the height difference compensating sheet 30' is provided, the gap between the components is compensated for by compensating for the height difference generated by the thickness of the first to fourth shielding sheets 10', 20', 40', and 50'. can prevent this from happening. The height difference compensating sheet 30 ′ may be provided with a tape or the like.

In addition, the portable terminal 100 ′ according to another embodiment of the present invention may include a housing 110 ′ covering the outside of the circuit board c. The housing 110 ′ may include a first housing 111 ′ and a second housing 112 ′ provided to be folded and unfolded.

10 is an exploded cross-sectional view illustrating a modified example of the mobile terminal of FIG. 8 .

As shown in FIG. 10, the first to fourth shielding sheets 10', 20', 40', 50' and the height difference compensating sheet 30' are the digitizer 130' and the folding plate 140'. can be placed between them. Since the folding plate 140' is disposed between the digitizer 130' and the support plate 170', the first to fourth shielding sheets 10' disposed between the digitizer 130' and the folding plate 140'. , 20 ', 40 ', 50 ') is the hinge unit 160 ', the first metal sheet 141 ', a pair of magnets (m) and the magnetic field generated by the at least one sensor (s) is the digitizer 130 ) can block the magnetic field before it affects the

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is disclosed in the drawings and in the specification with preferred embodiments. Here, although specific terms have been used, they are used only for the purpose of describing the present invention and are not used to limit the meaning or the scope of the present invention described in the claims. Therefore, it will be understood by those skilled in the art that various modifications and equivalent other embodiments of the present invention are possible therefrom. Accordingly, the true technical scope of the present invention should be defined by the technical spirit of the appended claims.

10,10': first shielding sheet 20,20': second shielding sheet
100,100': mobile terminal 110,110': housing
111,111': first housing 112,112': second housing
120,120': display 121: secondary display
130,130': Digitizer 140,140': Folding plate
151,151': first magnet 152,152': second magnet
160,160': hinge portion 161,161': first hinge plate
162,162': second hinge plate 163,163': hinge shaft
170,170': support plate 171,171': first support plate
172,172': second support plate

Claims (17)

A portable terminal comprising a digitizer, a folding plate disposed under the digitizer, and a support plate disposed under the folding plate and provided with a hinge portion to enable folding and unfolding,
and at least one shielding sheet for shielding a magnetic field with respect to the digitizer,
The shielding sheet is disposed between the digitizer and the folding plate or between the folding plate and the support plate. According to claim 1,
The shielding sheet,
and a first shielding sheet and a second shielding sheet disposed at a position corresponding to the hinge part to shield a magnetic field generated by the hinge part. 3. The method of claim 2,
The support plate includes a first support plate and a second support plate disposed on both sides of the hinge part,
The hinge portion includes a first hinge plate connected to the first support plate, and a second hinge plate connected to the second support plate,
The first hinge plate and the second hinge plate are rotatably connected about a hinge axis,
The first shielding sheet and the second shielding sheet are disposed at positions corresponding to the first hinge plate and the second hinge plate. 4. The method of claim 3,
The first shielding sheet and the second shielding sheet are disposed on both sides at a distance from the hinge axis. 4. The method of claim 3,
The first hinge plate and the second hinge plate are provided in plurality at intervals along the longitudinal direction of the hinge shaft,
The first shielding sheet is provided in plurality and disposed at a position corresponding to each of the first hinge plates, and the second shielding sheet is provided in plurality and disposed at a position corresponding to each of the second hinge plates. 3. The method of claim 2,
The folding plate,
a first metal sheet formed with a folding part to be folded; and
a second metal sheet and a third metal sheet joined to both sides of the first metal sheet;
The first shielding sheet and the second shielding sheet are disposed between the digitizer and the first metal sheet or between the first metal sheet and the hinge unit. 7. The method of claim 6,
The first metal sheet is a mobile terminal formed of a stainless material. 3. The method of claim 2,
It is disposed under the support plate, further comprising a pair of magnets provided at positions opposite to each other in the folded state of the support plate,
The shielding sheet,
and a third shielding sheet disposed at a position corresponding to the pair of magnets to shield a magnetic field generated from the pair of magnets. 9. The method of claim 8,
The third shielding sheet is a mobile terminal of a material having a lower magnetic permeability than the first shielding sheet and the second shielding sheet. 3. The method of claim 2,
It is disposed under the support plate, further comprising a circuit board provided with at least one sensor,
The shielding sheet,
The mobile terminal further comprising a fourth shielding sheet disposed at a position corresponding to the sensor to shield the magnetic field generated by the sensor. 11. The method of claim 10,
The fourth shielding sheet is a mobile terminal of a material having a lower magnetic permeability than the first shielding sheet and the second shielding sheet. According to claim 1,
The mobile terminal further comprising a height difference compensation sheet formed to a thickness corresponding to the shielding sheet, and compensating for the height difference due to the shielding sheet. A magnetic field shielding sheet for a mobile terminal including a digitizer, a folding plate disposed under the digitizer, and a support plate disposed under the folding plate and provided with a hinge portion to be folded and unfolded,
It is provided with at least one shielding sheet for shielding the magnetic field with respect to the digitizer,
The shielding sheet is a magnetic field shielding sheet for a mobile terminal disposed between the digitizer and the folding plate or between the folding plate and the support plate. 14. The method of claim 13,
The shielding sheet is a magnetic field shielding sheet for a mobile terminal of a magnetic member having a saturation magnetic flux density (Bs) of 1.7T or more. 14. The method of claim 13,
The shielding sheet is a magnetic field shielding sheet for a mobile terminal formed to a thickness of 0.1mm to 0.2mm. 14. The method of claim 13,
The shielding sheet is a magnetic shielding sheet for a mobile terminal comprising a silicon steel (silicon steel). 14. The method of claim 13,
The shielding sheet,
A magnetic shielding sheet for a mobile terminal, which is a multi-layer sheet in which a shielding layer comprising silicon steel, and at least one of a ribbon sheet of an amorphous alloy and a ribbon sheet of a nano-crystalline alloy is laminated.

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