JP3993565B2 - Electromagnetic wave shield sheet and its mounting structure - Google Patents

Description

  The present invention relates to an electromagnetic wave shielding sheet using a magnetic foil.

Digital electronic devices such as personal computers and mobile phones are rapidly spreading due to technological innovations such as digitalization of various controls, high-speed signal processing, and high-density mounting. Along with this, electromagnetic noise is regarded as a problem, and countermeasures are an important issue. Conventionally, magnetic foils made of a magnetic material such as permalloy (Fe-Ni alloy), silicon steel plate (Fe-Si alloy), Fe-based or Co-based amorphous alloy have been used as an electromagnetic shield sheet to counter these problems. It is considered to be. In addition, since many of these magnetic foils are more brittle than general metals, it is also considered to reinforce the strength by forming resin layers on both sides of the magnetic foil (see, for example, Patent Document 1). .
JP 2003-33989 A

  However, even when the strength of the magnetic foil is reinforced as described above, there is a possibility that the magnetic foil exposed at the end edge collapses or when the cut portion of the magnetic foil is cut and used. . Thus, if the magnetic foil spills from between the resin layers, the magnetic foil itself is conductive, which may cause a failure in surrounding circuits. Then, this invention was made | formed for the purpose of preventing well that the magnetic foil spills in the electromagnetic wave shield sheet using magnetic foil.

The invention according to claim 1 made to achieve the above object is an electromagnetic wave shielding sheet comprising a magnetic foil and a sheet-like member made of a film covering the magnetic foil from both sides, wherein the sheet-like member is , by being sealed to each other at the protruding portion protruding from the edge portion of the magnetic foil, sealed one by one the magnetic foil, on the sheet-like member at least one side over the entire surface of the magnetic foil It is characterized in that the magnetic foil is hardly broken by being attached.

In this invention, the sheet-like member which consists of a film which covers magnetic foil from both surfaces protrudes from the edge part of a magnetic foil, and is mutually sealed by the part which protruded. The sheet-like member is sealed by wrapping magnetic foils one by one in a unit.
In addition, the magnetic foil is a material that is relatively brittle or has poor workability and is likely to generate chips. In the present invention, the sheet-like member covers the entire surface of at least one surface of the magnetic foil sealed one by one. It is stuck on. For this reason, the magnetic foil is less likely to collapse or spill.

The invention of claim 2, wherein, in addition to the configuration of claim 1, wherein, you are characterized by sheet-like member at least the magnetic foil is adhered is PET film.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the sheet-shaped member includes a first sheet-shaped member that covers one surface of the magnetic foil, and the other surface of the magnetic foil. The first sheet-like member or the second sheet-like member is a flatter sheet-like member than the other.

  In the present invention, since one of the first sheet-like member and the second sheet-like member is a flatter sheet-like member than the other, the flat sheet-like member is attached to an electronic component or the like. If so, it can be mounted even better.

  According to a fourth aspect of the present invention, in addition to the configuration according to any one of the first to third aspects, the sheet-shaped member includes a first sheet-shaped member that covers one surface of the magnetic foil, and the magnetic foil. The second sheet-like member covering the other surface, and the portions of the first sheet-like member and the second sheet-like member that protrude from the edge of the magnetic foil were adhered to each other. It is characterized by that.

  That is, the electromagnetic wave shielding material of the present invention is formed by sequentially stacking the first sheet-like member, the magnetic foil, and the second sheet-like member, and each of the magnetic foils in the first sheet-like member and the second sheet-like member. It can be obtained by sticking together the portions protruding from the edge. For this reason, the edge part of magnetic foil is protected by the said sticking part, and it becomes difficult for a magnetic foil to collapse or to spill off.

  According to a fifth aspect of the present invention, in addition to the configuration according to any one of the first to third aspects, the sheet-like member includes a first sheet-like member that covers one surface of the magnetic foil, and the magnetic foil. The second sheet-like member covering the other surface, and the portions of the first sheet-like member and the second sheet-like member that protrude from the edge of the magnetic foil were welded together. It is characterized by.

  That is, the electromagnetic wave shielding material of the present invention is formed by sequentially stacking the first sheet-shaped member, the magnetic foil, and the second sheet-shaped member, and the magnetic sheet in each of the first sheet-shaped member and the second sheet-shaped member. It is obtained by welding the portions protruding from the end edge portions to each other. For this reason, the edge part of magnetic foil is protected by the said welding part, and it becomes difficult for a magnetic foil to collapse or to spill off.

  In addition to the structure in any one of Claims 1-5, invention of Claim 6 is that the double-sided adhesive tape was affixed on the surface of the center part of the said sheet-like member at least of the said sheet-like member. It is a feature.

In this invention, since the double-sided adhesive tape is affixed on the center part surface (outer surface) of a sheet-like member, it becomes possible to mount | wear with an electronic component etc. via the double-sided adhesive tape.
The invention according to claim 7 is characterized in that, in addition to the structure according to any one of claims 1 to 6 , at least one surface of the magnetic foil is stuck to the sheet-like member via a double-sided adhesive tape. Yes.

Invention 請 Motomeko 8 wherein, in addition to the configuration of claim 6, wherein the surface of the double-sided adhesive tape is characterized in that the carrier sheet having an area larger than the double-sided adhesive tape is stuck.

  In the present invention, since the carrier sheet is adhered to the surface (outer surface) of the double-sided pressure-sensitive adhesive tape, it is possible to carry the electromagnetic wave shield sheet integrally with the carrier sheet and peel it off from the carrier sheet during use. Become. Moreover, since the carrier sheet has a larger area than the double-sided pressure-sensitive adhesive tape, it is easy to peel off the electromagnetic wave shielding sheet from the carrier sheet.

In addition to the structure in any one of Claims 1-8, invention of Claim 9 is characterized by the said sheet-like member being transparent or translucent.
In the present invention, since the sheet-like member is transparent or translucent, it is easier to position the magnetic foil on the surface of the electronic component or the like.

  The invention according to claim 10 is an electromagnetic shield sheet mounting structure in which the electromagnetic shield sheet according to any one of claims 1 to 9 is attached to a flat portion of an electronic component mounted on a substrate, wherein the magnetic foil However, it has an area larger than the plane part.

  In the present invention, since the electromagnetic wave shielding sheet according to any one of claims 1 to 8 is attached to an electronic component, electromagnetic wave shielding to the electronic component can be performed as described above. In the present invention, the magnetic foil has an area larger than the plane portion of the electronic component. For this reason, electromagnetic waves entering and exiting the electronic component are better shielded. Furthermore, the sheet-like member protrudes from the end edge portion of the magnetic foil, and further extends from the flat portion of the electronic component. For this reason, the sheet-like member also prevents other conductive members such as a driver from inadvertently contacting the lead terminals of the electronic component during maintenance of the electric / electronic device.

  As described above, in the first aspect of the present invention, the magnetic foil is not simply sandwiched between any members but is sealed in a bag shape by the sheet-like member. For this reason, it is possible to satisfactorily prevent the magnetic foil from spilling and to perform electromagnetic wave shielding with the magnetic foil. Therefore, in the present invention, it is possible to satisfactorily and easily suppress the generation of electromagnetic noise without causing a failure due to the fall of the magnetic foil in the circuit. The term “sealing” as used in the present invention does not necessarily mean that the sealing is performed in an airtight manner, but it is sufficient that the sealing can be performed to such an extent that the magnetic foil can be prevented from falling.

Moreover, the the present invention, the sheet-like member made of a film sealed one by one magnetic foil, by attaching to the sheet-like member over at least one surface of the magnetic foil on the entire surface, the magnetic foil is broken Can be prevented. That is, when the magnetic foil is broken, the magnetic foil in the electromagnetic wave shielding sheet may be gathered in one place and the electromagnetic wave shielding effect may not be exhibited. However, in the present invention, occurrence of such a situation can be well prevented. . Therefore, in addition to the above effects, there is an effect that the electromagnetic foil can be shielded better while maintaining the shape of the magnetic foil better.

  In the invention according to claim 3, in addition to the effect of the invention according to claim 1 or 2, by attaching the flat sheet-like member to an electronic component or the like, the electromagnetic wave shielding sheet is more satisfactorily attached. The effect that electromagnetic wave shielding can be performed more favorably occurs.

  In invention of Claim 4, the edge part of magnetic foil is protected by the sticking part of a sheet-like member, and it can prevent that the magnetic foil collapse | crumbles. Therefore, in addition to the effect of the invention according to any one of claims 1 to 3, there is an effect that the electromagnetic foil can be shielded better while maintaining the shape of the magnetic foil.

  In invention of Claim 5, the edge part of magnetic foil is protected by the welding part of a sheet-like member, and it can prevent that the magnetic foil collapse | crumbles. Therefore, in addition to the effect of the invention according to any one of claims 1 to 3, there is an effect that the electromagnetic foil can be shielded better while maintaining the shape of the magnetic foil.

  In invention of Claim 6, it becomes possible to mount | wear to an electronic component etc. via the double-sided adhesive tape stuck on the sheet-like member surface. Therefore, in addition to the effect of the invention according to any one of claims 1 to 5, it is possible to make it easier to mount the electronic component or the like, and to further improve the workability of the mounting work. Occurs.

  In the invention according to claim 8, the electromagnetic wave shielding sheet can be carried along with the carrier sheet and peeled off from the carrier sheet at the time of use. Moreover, it is easy to peel off the electromagnetic shielding sheet from the carrier sheet. Therefore, in the present invention, in addition to the effect of the invention according to the sixth aspect, an effect that the workability of the mounting work with respect to the electronic component or the like can be further improved is produced. In addition, when a plurality of electromagnetic shielding sheets are arranged and pasted on the carrier sheet and the carrier sheet has a larger area than the whole electromagnetic shielding sheet, it is possible to easily attach the plurality of electromagnetic shielding sheets, and the above workability is further improved. To do.

  According to the ninth aspect of the present invention, it becomes easier to position the magnetic foil on the surface of the electronic component or the like. Therefore, in addition to the effect of the invention according to any one of claims 1 to 8, there is an effect that the workability of the mounting work with respect to the electronic component or the like can be further improved.

  In the invention according to claim 10, since the electromagnetic wave shielding sheet according to any one of claims 1 to 9 is attached to the flat portion of the electronic component, the electromagnetic wave shielding can be performed on the electronic component as described above. Moreover, in this invention, since the magnetic foil has an area more than the plane part of an electronic component, the electromagnetic waves which go in and out of the electronic component can be shielded further. Furthermore, since the sheet-like member protrudes from the edge portion of the magnetic foil and extends further from the flat portion of the electronic component, another conductive member such as a driver contacts the lead terminal of the electronic component. Can also be prevented.

  Next, an embodiment to which the present invention is applied will be described with reference to the drawings. As shown in FIG. 1, the electromagnetic wave shielding sheet 10 of the present embodiment is arranged in a line on the upper surface of a carrier tape 20 made of PET (in the following description, the upper side in FIG. 1 is described as “upper”). Established.

  As shown in FIG. 1 and FIG. 2 (A) as a cross-sectional view taken along line AA, the electromagnetic wave shielding sheet 10 includes a magnetic foil 11 having a size of (12 mm × 12 mm × 0.025 mm), and has an upper surface. The film 12 having a size of (14 mm × 14 mm × 0.025 mm) as the first sheet-like member is overlaid. That is, as shown in the top view of FIG. 2B, the length b of one side of the film 12 is 2 mm longer than the length a of one side of the magnetic foil 11. In other words, the film 12 has a protruding portion c around the magnetic foil 11 (four sides) of 1 mm.

  In FIG. 1 and FIG. 2 (A), the double-sided adhesive tape 13 is affixed on the lower surface of the magnetic foil 11 and the lower surface of the film 12 that protrudes around the magnetic foil 11. A film 14 as a second sheet-like member is attached to the lower surface of the double-sided adhesive tape 13, a double-sided adhesive tape 15 is attached to the lower surface of the film 14, and a carrier tape 20 is attached to the lower surface of the double-sided adhesive tape 15 in sequence. Has been. In addition, in each figure, the thickness of each part was drawn thicker than the actual ratio for convenience (especially double-sided adhesive tapes 13 and 15).

  As the magnetic foil 11, a trade name “METGLAS” (import source: Nippon Amorphous Metal Co., Ltd.) was used. The film 14 is a transparent (or translucent) PET film having the same size as the film 12. Furthermore, the double-sided pressure-sensitive adhesive tapes 13 and 15 (see JIS Z1528) have the same sheet shape as the films 12 and 14.

  For this reason, in the electromagnetic wave shielding sheet 10, the films 12 and 14 are attached to each other around the magnetic foil 11 via the double-sided adhesive tape 13, and are configured in a unit shape that seals the magnetic foil 11. And the electromagnetic wave shield sheet 10 which consists of the magnetic foil 11, the films 12, 14, and the double-sided adhesive tapes 13 and 15 is adhered by sticking the lower surface of the film 14 to the upper surface of the carrier tape 20 via the double-sided adhesive tape 15. The transparent PET carrier tape 20 is arranged in a row in the center.

  The electromagnetic shielding sheet 10 thus configured is peeled off from the carrier tape 20 one by one, and as illustrated in FIG. 3, the upper end surface (on the plane portion) of the electronic component 32 such as an IC placed on the printed circuit board 31. It is fixed via a double-sided adhesive tape 15. The area of the magnetic foil 11 is preferably the same as the area of the upper end surface of the electronic component 32 as shown in FIG. 4 (A) or slightly wider than that as shown in FIG. 4 (B). In this case, the electromagnetic waves entering and exiting the electronic component 32 can be shielded better.

  At this time, since the films 12 and 14 and the double-sided adhesive tapes 13 and 15 protrude from the upper end surface of the electronic component 32 in the outer peripheral direction, another conductive member such as a driver (not shown) contacts the lead terminal 32a of the electronic component 32. Can also be prevented. As shown in FIG. 4C, the electronic component 32 is attached to an electronic component 32 that is slightly larger than the magnetic foil 11, and the outer periphery of the electromagnetic wave shielding sheet 10 coincides with the outer periphery of the electronic component 32. Needless to say, the outer periphery may be smaller than the outer periphery of the electronic component 32.

  Further, in the electromagnetic wave shielding sheet 10, positioning with respect to the electronic component 32 is facilitated by making portions other than the magnetic foil transparent (or translucent). Moreover, as shown in FIG. 2 (A), the film 14 and the double-sided adhesive tape 13, 15 can be substantially planar. For this reason, the electromagnetic wave shielding sheet 10 can be more conveniently attached to the electronic component 32, and an electromagnetic wave shield with fewer gaps can be formed on the electronic component 32.

  Thus, the electromagnetic wave shielding sheet 10 can be easily and stably fixed to the upper end surface of the electronic component 32, and electromagnetic waves entering and exiting the electronic component 32 can be well shielded by the magnetic foil 11. Moreover, since the magnetic foil 11 is adhered to the film 14 via the double-sided adhesive tape 13, the strength of the magnetic foil 11 can be reinforced. If the magnetic foil 11 collapses, the magnetic foil 11 in the electromagnetic wave shielding sheet 10 may gather at one place and the electromagnetic wave shielding effect may not be exhibited. In this embodiment, the occurrence of such a situation can be satisfactorily prevented. it can. Furthermore, since the strength of the magnetic foil 11 is reinforced, the selection range of the magnetic foil 11 is expanded. In addition, since the films 12 and 14 are bonded around the magnetic foil 11, the magnetic foil 11 can be protected by the bonded portion, and the shape of the magnetic foil 11 can be maintained better. Therefore, in the present embodiment, the electromagnetic waves entering and exiting the electronic component 32 can be shielded very well, and the generation of electromagnetic noise can be suppressed very well.

  Further, in the electromagnetic wave shielding sheet 10, the magnetic foil 11 is wrapped in a unit shape by the films 12 and 14, so that even if the magnetic foil 11 is partially broken or the edge portion collapses, Spilling off can be prevented well. Therefore, it is possible to satisfactorily prevent the circuit on the printed circuit board 31 from being damaged due to the spillage of the magnetic foil 11. In addition, if the magnetic foil 11 and the films 12 and 14 are stuck through the double-sided pressure-sensitive adhesive tape 13 so that bubbles do not enter, their adhesion is improved, and the above-described effect becomes more prominent. .

The present invention is not limited to the above-described embodiment, and can be implemented in various forms without departing from the gist of the present invention. For example, but it may also be omitted double-sided adhesive tape 15 and carrier tape 20 as shown in FIG. 5 (A). Further, although deviating from the scope of the present invention, it may be considered that the film 14 and the double-sided adhesive tape 15 are omitted as in the reference example shown in FIG. Further , as shown in FIG. 5C, release paper 21 may be used instead of the carrier tape 20.

In the form of FIG. 5 (A), the electromagnetic shielding sheet 10 constituted by the magnetic foil 11, the film 12, the double-sided adhesive tape 13, and the film 14 is attached to the electronic component 32 via an adhesive or other double-sided adhesive tape (not shown). It can fix to the upper end surface etc. In the reference example of FIG. 5B, the simple electromagnetic wave shielding sheet 10 constituted by the magnetic foil 11, the film 12, and the double-sided adhesive tape 13 is fixed to the upper end surface of the electronic component 32 through the double-sided adhesive tape 13. it can be. Also, as the double-sided adhesive tape 13, Ru can be used a paper that a base material.

  5C, the electromagnetic wave shielding sheet 10 similar to that shown in FIGS. 1 to 3 can be fixed to the upper end surface or the like of the electronic component 32 by peeling off the release paper 21. Note that one release paper 21 may be provided for each electromagnetic wave shield sheet 10, and may be shared by a plurality of electromagnetic wave shield sheets 10 as with the carrier tape 20.

  In addition, since the carrier tape 20 shown in FIG. 1 has a wider width than the electromagnetic wave shielding sheet 10, it can be easily peeled off from the carrier tape 20 during use. Moreover, if the long thing of the carrier tape 20 and many electromagnetic wave shield sheets 10 is made into a roll, the workability | operativity of the mounting | wearing operation | work with respect to the electronic component 32 etc. can be improved further.

  Furthermore, in the said embodiment, although the part which protruded from the edge part of the magnetic foil 11 of the films 12 and 14 which covers the magnetic foil 11 from the upper and lower sides is mutually stuck with the double-sided adhesive tape 13, this part is They may be welded together by a laminate method. FIG. 5 (D) shows a structure in which the double-sided pressure-sensitive adhesive tape 13 is aligned with the same size as the magnetic foil 11 and the films 12 and 14 are welded by a laminate method in the form of FIG. 5 (C). FIG. 5E shows the double-sided pressure-sensitive adhesive tape 13 having the same size as that of the magnetic foil 11 and the films 12 and 14 welded by a laminating method in the form shown in FIGS.

  Furthermore, in each of the above embodiments, the first sheet-like member (film 12), the magnetic foil 11, and the second sheet-like member (film 14 or double-sided adhesive tape 13) are sequentially stacked. The member may be composed of one sheet. For example, as shown in FIG. 5 (F), a film 16 having a combined width of the films 12 and 14 may be wound around the magnetic foil 11 and both ends may be welded. However, in each of the above-described embodiments, a welded portion or a sticking portion of the film is formed over the entire circumference of the magnetic foil 11, thereby protecting the magnetic foil 11, thereby causing the magnetic foil 11 to collapse or fall off. Can be prevented even better. Moreover, in each said form except FIG.5 (B), you may replace the double-sided adhesive tape 13 with the layer of an adhesive agent.

It is a perspective view showing the structure of the electromagnetic wave shield sheet to which this invention was applied. It is sectional drawing and the top view showing the structure of the electromagnetic wave shield sheet. It is a perspective view which illustrates the usage method of the electromagnetic wave shield sheet. It is a side view which illustrates the magnitude relationship between the electromagnetic wave shield sheet and an electronic component. It is sectional drawing showing the structure of the modification of the electromagnetic wave shield sheet, and a reference example .

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Electromagnetic shielding sheet 11 ... Magnetic foil 12, 14, 16 ... Film 13, 15 ... Double-sided adhesive tape 20 ... Carrier tape 32 ... Electronic component

Claims (10)

Magnetic foil,
A sheet-like member made of a film covering the magnetic foil from both sides;
An electromagnetic wave shielding sheet comprising:
The sheet-shaped member, by being sealed to each other at the protruding portion protruding from the edge portion of the magnetic foil, sealed one by one the magnetic foil, at least one surface of the magnetic foil over the entire surface An electromagnetic wave shielding sheet, wherein the magnetic foil is made difficult to collapse by being attached to the sheet-like member.   The electromagnetic wave shielding sheet according to claim 1, wherein at least the sheet-like member to which the magnetic foil is adhered is a PET film. The sheet-like member is composed of a first sheet-like member that covers one surface of the magnetic foil, and a second sheet-like member that covers the other surface of the magnetic foil,
The electromagnetic wave shielding sheet according to claim 1 or 2, wherein one of the first sheet-like member and the second sheet-like member is a flatter sheet-like member than the other. The sheet-like member is composed of a first sheet-like member that covers one surface of the magnetic foil, and a second sheet-like member that covers the other surface of the magnetic foil,
The part which protruded from the edge part of the said magnetic foil of the said 1st sheet-like member and the said 2nd sheet-like member was mutually stuck, The one in any one of Claims 1-3 characterized by the above-mentioned. Electromagnetic shielding sheet. The sheet-like member is composed of a first sheet-like member that covers one surface of the magnetic foil, and a second sheet-like member that covers the other surface of the magnetic foil,
The part which protruded from the edge part of the said magnetic foil of the said 1st sheet-like member and the said 2nd sheet-like member was welded mutually, The one in any one of Claims 1-3 characterized by the above-mentioned. Electromagnetic wave shield sheet.   The electromagnetic wave shielding sheet according to any one of claims 1 to 4, wherein a double-sided pressure-sensitive adhesive tape is attached to at least the surface of the central part of the sheet-like member.   The electromagnetic wave shielding sheet according to claim 1, wherein at least one surface of the magnetic foil is attached to the sheet-like member via a double-sided adhesive tape.   The electromagnetic wave shielding sheet according to claim 6, wherein a carrier sheet having a larger area than that of the double-sided pressure-sensitive adhesive tape is attached to the surface of the double-sided pressure-sensitive adhesive tape.   The electromagnetic wave shielding sheet according to claim 1, wherein the sheet-like member is transparent or translucent. An electromagnetic wave shielding sheet mounting structure in which the electromagnetic wave shielding sheet according to any one of claims 1 to 9 is attached to a planar portion of an electronic component mounted on a substrate,
The electromagnetic shield sheet mounting structure, wherein the magnetic foil has an area larger than the plane part.

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