WO2020255790A1 - 電子機器 - Google Patents

電子機器 Download PDF

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Publication number
WO2020255790A1
WO2020255790A1 PCT/JP2020/022661 JP2020022661W WO2020255790A1 WO 2020255790 A1 WO2020255790 A1 WO 2020255790A1 JP 2020022661 W JP2020022661 W JP 2020022661W WO 2020255790 A1 WO2020255790 A1 WO 2020255790A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit board
printed circuit
shield member
electronic device
antenna
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/022661
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
相佑 金
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Interactive Entertainment Inc
Original Assignee
Sony Interactive Entertainment Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Interactive Entertainment Inc filed Critical Sony Interactive Entertainment Inc
Priority to US17/616,319 priority Critical patent/US11997840B2/en
Priority to JP2021528107A priority patent/JP7562526B2/ja
Publication of WO2020255790A1 publication Critical patent/WO2020255790A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • H05K9/0007—Casings
    • H05K9/002—Casings with localised screening
    • H05K9/0022—Casings with localised screening of components mounted on printed circuit boards [PCB]
    • H05K9/0024—Shield cases mounted on a PCB, e.g. cans or caps or conformal shields
    • H05K9/0032—Shield cases mounted on a PCB, e.g. cans or caps or conformal shields having multiple parts, e.g. frames mating with lids
    • H05K9/0033—Shield cases mounted on a PCB, e.g. cans or caps or conformal shields having multiple parts, e.g. frames mating with lids disposed on both PCB faces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/526—Electromagnetic shields

Definitions

  • the present invention relates to an electronic device having a built-in printed circuit board.
  • ⁇ Generally, electronic devices have a built-in printed circuit board on which various electronic components are mounted. Some of these electronic components generate an electromagnetic field that becomes noise that affects the operation of other electronic components and wireless communication. In order to prevent such noise propagation, a shield member formed of a metal plate or the like covers a circuit element that is a source of noise.
  • the present invention has been made in consideration of the above circumstances, and one of the objects thereof is an electron capable of effectively suppressing noise generated from a circuit element arranged on a printed circuit board by a shield member. It is to provide equipment.
  • the electronic device includes a printed circuit board on which an electronic component is mounted on the surface thereof, and a shield member arranged so as to face the surface of the printed circuit board and cover the electronic component.
  • the shield member has a protruding portion that extends outward beyond one end of the printed circuit board in a plan view, and the protruding portion is bent toward the printed circuit board, and the tip thereof is at least a side surface of the printed circuit board. It is characterized in that it extends to opposite positions.
  • the electronic device 1 is, for example, a home-use game machine or the like, and is a printed circuit board (printed wiring board) 10 on which various electronic components are mounted and a front shield member attached to the printed circuit board 10. 20, the back side shield member 30, and the antenna 40 are included.
  • FIG. 1 is a perspective view showing the state of the surface of the printed circuit board 10 in a state before the front side shield member 20 and the back side shield member 30 are attached.
  • FIG. 2 is a perspective view showing a state of the surface of the printed circuit board 10 in a state where the front side shield member 20 and the back side shield member 30 are attached.
  • FIG. 3 is a partial cross-sectional view showing a positional relationship of the printed circuit board 10 in a state where the front side shield member 20 and the back side shield member 30 are attached, as viewed from the side.
  • At least one electronic component 11 that is a source of noise is arranged on the surface of the printed circuit board 10. Although only one electronic component 11 is shown on the surface side of the printed circuit board 10 in FIG. 1, a plurality of electronic components may be arranged on the surface of the printed circuit board 10. Further, the printed circuit board 10 may be a double-sided printed circuit board, and one or a plurality of electronic components may be arranged on the back surface side as well.
  • the front side shield member 20 and the back side shield member 30 are members for shielding electromagnetic waves that become noise radiated from the printed circuit board 10 and electronic components arranged on the printed circuit board 10, and are formed by a conductive member such as a metal plate. It is formed.
  • the front shield member 20 is arranged so as to face the surface of the printed circuit board 10 and cover the electronic component 11, and is fixed to the printed circuit board 10.
  • the back side shield member 30 is arranged so as to face the back surface of the printed circuit board 10 and is fixed to the printed circuit board 10. The structure of these shield members will be described in detail later.
  • the antenna 40 is a conductor used for transmitting and receiving wireless signals, and the electronic device 1 performs wireless communication with an external communication device via the antenna 40.
  • the frequency used by the antenna 40 for wireless communication is referred to as a communication frequency.
  • the antenna 40 is arranged at a position separated from the printed circuit board 10 in a predetermined direction. That is, the antenna 40 is arranged at a position that does not overlap with the printed circuit board 10 in a plan view.
  • viewing the direction perpendicular to the surface of the printed circuit board 10 from the surface side of the printed circuit board 10 is referred to as a plan view.
  • the side on which the antenna 40 is arranged as viewed from the printed circuit board 10 is referred to as the front side of the electronic device 1.
  • the direction in which the printed substrate 10 and the antenna 40 are aligned parallel to the surface of the printed substrate 10 is the Y-axis direction
  • Y is parallel to the surface of the printed substrate 10.
  • the direction orthogonal to the axial direction is the X-axis direction
  • the thickness direction of the printed substrate 10 is the Z-axis direction.
  • the right direction is the X-axis positive direction
  • the side from the printed circuit board 10 toward the antenna 40 is the Y-axis positive direction
  • the direction from the back surface to the front surface of the printed circuit board 10 is Z.
  • the axis is in the positive direction.
  • the electronic component 11 in particular emits noise in a frequency band that overlaps with the communication frequency of the antenna 40. Therefore, it is necessary to shield the noise with a shield member so that the noise radiated from the electronic component 11 does not interfere with the wireless communication by the antenna 40.
  • a protruding portion further protruding from one end of the printed circuit board 10 is provided at one end of the front shield member 20 on the antenna 40 side. Noise is blocked by the protruding part.
  • the structure of the front shield member 20 that realizes such an operation will be described.
  • the front shield member 20 has a rectangular shape that overlaps with the printed circuit board 10 in a plan view, and protrudes beyond one end of the printed circuit board 10 at one end on the Y-axis positive direction side (antenna 40 side). There is a part to be used.
  • the portion of the front shield member 20 that overlaps with the printed circuit board 10 in a plan view is referred to as a main body portion 21, and the portion that protrudes from the main body portion 21 in the positive direction of the Y axis is referred to as a protruding portion 22.
  • the main body 21 includes a convex portion 21a formed in a convex shape on the positive direction side of the Z axis and a concave shape on the negative direction side, and the convex portion 21a covers the electronic component 11. Further, the front shield member 20 is fastened to the printed circuit board 10 by screws 21b at a plurality of positions along the outer circumference of the main body 21. As will be described in detail later, the main body 21 is screwed to the printed circuit board 10 along three sides excluding one side on the Y-axis positive direction side (antenna 40 side).
  • the protruding portion 22 extends in the positive Y-axis direction to a position between the printed circuit board 10 and the antenna 40 in a plan view, and has a shape in which the tip portion thereof is bent in the negative Z-axis direction (printed circuit board 10 side).
  • the projecting portion 22 includes a stretched portion 22a extending in the positive direction of the Y-axis substantially parallel to the surface of the printed circuit board 10, and a shielding portion 22b extending in the negative direction of the Z-axis substantially orthogonal to the surface of the printed circuit board 10. Is configured to include.
  • the upper end of the shielding portion 22b is connected to the tip of the stretched portion 22a, whereby the tip of the protruding portion 22 is bent toward the printed circuit board 10 as a whole, and is L-shaped when viewed from the side surface (X-axis direction). have.
  • the shielding portion 22b extends at least to a position overlapping the side surface of the printed circuit board 10 when viewed from the front side of the electronic device 1. As a result, a part of the shielding portion 22b faces the side surface of the printed circuit board 10 on the positive direction side of the Y axis. The tip portion of the shielding portion 22b is not in contact with the printed circuit board 10 or the back side shielding member 30. However, by extending the shielding portion 22b to at least a position facing the side surface of the printed circuit board 10, the front side shielding member 20 functions as a partition wall separating the printed circuit board 10 and the antenna 40, and noise radiated from the electronic component 11 is generated. It can be shielded so that it does not reach the antenna 40.
  • the back side shield member 30 also includes a main body portion 31 that overlaps with the printed circuit board 10 in a plan view, and a protruding portion 32 that projects in the positive direction of the Y axis with respect to the printed circuit board 10.
  • the protruding portion 32 of the back side shield member 30 extends in the negative direction of the Z axis substantially orthogonal to the back surface of the printed circuit board 10 and the extending portion 32a extending in the positive direction of the Y axis substantially parallel to the back surface of the printed circuit board 10.
  • a tip portion 32b whose upper end is connected to a stretched portion 32a, and the like.
  • the stretched portion 32a is arranged so as to face each other so as to be parallel to the stretched portion 22a of the front side shield member 20 and the tip portion 32b to the shield portion 22b of the front side shield member 20.
  • an L-shaped space is formed between them when viewed from the X-axis direction.
  • this L-shaped space is referred to as a waveguide G.
  • the waveguide G functions as a guide for guiding the path of noise propagating from the electronic component 11 and changing its direction. That is, by propagating through the waveguide G, the direction of the noise radiated from the electronic component 11 to the antenna 40 side is changed to the Z-axis negative direction side. As a result, noise from the electronic component 11 is less likely to affect the antenna 40.
  • the inventors of the present application assume that the length of the stretched portion 22a is t and the length of the shielding portion 22b is h, and by lengthening each of these, the distance between the electronic component 11 and the antenna 40 is set. It was confirmed by simulation that the isolation (index value indicating the influence of noise) was reduced.
  • 4 and 5 are graphs showing the simulation results of isolation between the electronic component 11 and the antenna 40 when the length t of the stretched portion 22a and the length h of the shielding portion 22b are changed, respectively. .. The length of each part in these graphs is shown in units of the wavelength ⁇ corresponding to the communication frequency of the antenna 40.
  • the alternate long and short dash line in these graphs shows the isolation value when the protrusion 22 and the protrusion 32 are not provided.
  • the isolation is improved by increasing the lengths t and h, respectively.
  • each of the lengths t and h is set to 3 / 10 ⁇ or more, a significant improvement effect is obtained as compared with the case where the protruding portion 22 and the protruding portion 32 are not provided.
  • the protruding portion 22 as described above on the front side shield member 20, the side of the main body 21 on the side where the protruding portion 22 is provided (Y-axis positive direction side) is not screwed to the printed circuit board 10. In both cases, noise propagation to the antenna 40 side can be prevented.
  • the inventors of the present application have made a difference in isolation between the electronic component 11 and the antenna 40 when the side of the main body 21 on the positive direction side of the Y axis is screwed to the printed circuit board 10 and when it is not screwed. Confirmed by simulation. As a result, it was found that there was almost no deterioration in isolation when screwing was not performed as compared with the case where screwing was performed. That is, in the electronic device 1 according to the present embodiment, by providing the protruding portion 22, it is not necessary to screw the side of the protruding portion 22 side to the printed circuit board 10, and the number of screwed portions can be reduced.
  • the antenna is provided from the inside of the front side shield member 20 without screwing the side on the antenna 40 side. It is possible to prevent noise propagation to the 40 side and secure isolation between the electronic component 11 and the antenna 40.
  • the embodiments of the present invention are not limited to those described above.
  • the protruding portion 22 of the front side shield member 20 may have various shapes having an facing portion facing the side surface of the printed circuit board 10.
  • some modifications of the embodiment of the present invention will be described.
  • FIG. 6 is a partially enlarged view showing the shapes of the front side shield member 20 and the back side shield member 30 in the electronic device according to the first modification.
  • the front side shield member 20 has substantially the same protrusion 22 as compared with the embodiments shown in FIGS. 2 and 3, but the back side shield member 30 includes the protrusion 32.
  • the noise propagated from the electronic component 11 is shielded to some extent by the protrusion 22, and the influence of the noise on the antenna 40 can be reduced.
  • FIG. 7 is a partially enlarged view showing the shapes of the front side shield member 20 and the back side shield member 30 in the electronic device according to the second modification.
  • the back shield member 30 does not include the protrusion 32.
  • the protruding portion 22 of the front side shield member 20 is first extended from the main body portion 21 in the positive direction of the Y axis, then bent from there to be extended in the negative direction of the Z axis, and then further bent again and extended in the negative direction of the Y axis. doing.
  • the protruding portion 22 has a stretched portion 22a extending in the positive direction of the Y-axis, a shielding portion 22b extending in the negative direction of the Z-axis and facing the side surface of the printed circuit board 10, and a tip portion 22c extending in the negative direction of the Y-axis. And are configured to include.
  • the base end of the tip portion 22c is connected to the tip of the shielding portion 22b, and the tip is not connected to other members.
  • the tip portion 22c is arranged parallel to the end portion of the back side shield member 30 on the positive direction side of the Y axis, and faces the back side shield member 30 at a predetermined distance.
  • FIG. 8 is a partially enlarged view showing the shapes of the front side shield member 20 and the back side shield member 30 in the electronic device according to the third modification.
  • the lateral width (width in the X-axis direction) of the protruding portion 22 is substantially the same as that of the main body portion 21, and is formed so as to shield the entire side surface of the printed circuit board 10 on the positive direction side of the Y-axis.
  • the lateral width of the protruding portion 22 is shorter than the lateral width of the main body portion 21.
  • the lateral width of the protruding portion 32 of the back side shield member 30 is also substantially the same as the lateral width of the protruding portion 22, and is arranged so as to face the protruding portion 22.
  • At least the range of the protrusion 22 along the X-axis direction includes the position of the antenna 40 and has a predetermined length range from the antenna 40 in each of the positive and negative directions of the X-axis.
  • the protrusion 22 is formed so as to include the above.
  • This predetermined length is a length corresponding to the wavelength ⁇ corresponding to the communication frequency of the antenna 40. That is, when the position of the antenna 40 in the X-axis direction is located at the center of the protrusion 22 in the width direction, the width of the protrusion 22 is at least the width w of the antenna 40 in the X-axis direction and the left and right lengths ⁇ . , It is desirable that the total length (w + 2 ⁇ ) or more.
  • the side surface of the printed circuit board 10 is opened without being shielded at a portion of the end portion of the main body portion 21 on the positive direction side of the Y-axis where the protruding portion 22 is not provided. Become. By covering this portion with a conductor, the noise shielding effect can be enhanced. Further, the side surface of the waveguide portion G (the surface on the positive direction side and the negative direction side of the X axis) formed by the projecting portion 22 and the projecting portion 32 facing each other is also covered with a conductor to have a noise shielding effect. Can be enhanced.
  • 1 electronic device 10 printed circuit board, 11 electronic parts, 20 front side shield member, 21 main body part, 21a convex part, 21b screw, 22 protruding part, 22a extension part, 22b shielding part, 30 back side shield member, 31 main body part, 32 Protruding part, 32a extension part, 32b facing part, 40 antenna.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Details Of Aerials (AREA)
PCT/JP2020/022661 2019-06-17 2020-06-09 電子機器 Ceased WO2020255790A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US17/616,319 US11997840B2 (en) 2019-06-17 2020-06-09 Electronic device
JP2021528107A JP7562526B2 (ja) 2019-06-17 2020-06-09 電子機器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019112277 2019-06-17
JP2019-112277 2019-06-17

Publications (1)

Publication Number Publication Date
WO2020255790A1 true WO2020255790A1 (ja) 2020-12-24

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ID=74037248

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/022661 Ceased WO2020255790A1 (ja) 2019-06-17 2020-06-09 電子機器

Country Status (3)

Country Link
US (1) US11997840B2 (https=)
JP (1) JP7562526B2 (https=)
WO (1) WO2020255790A1 (https=)

Citations (6)

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JPS59112973U (ja) * 1983-01-20 1984-07-30 富士通株式会社 高周波用混成集積回路のケ−ス格納構造
US5557064A (en) * 1994-04-18 1996-09-17 Motorola, Inc. Conformal shield and method for forming same
JPH10229289A (ja) * 1997-02-24 1998-08-25 Sega Enterp Ltd ノイズシールド構造を備える電子機器
JP2002344172A (ja) * 2001-05-16 2002-11-29 Matsushita Electric Ind Co Ltd 無線端末装置
JP2008005461A (ja) * 2006-05-24 2008-01-10 Sharp Corp 衛星信号用コンバータ、アンテナ装置および衛星放送受信装置
JP2018060991A (ja) * 2016-09-28 2018-04-12 住友ベークライト株式会社 封止用フィルム、電子部品搭載基板の封止方法および封止用フィルム被覆電子部品搭載基板

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JPH06112973A (ja) 1992-09-25 1994-04-22 Matsushita Electric Works Ltd パケット再送方式
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US6137051A (en) * 1998-12-09 2000-10-24 Nortel Networks Corporation EMI shield/ gasket enclosure
US6900383B2 (en) * 2001-03-19 2005-05-31 Hewlett-Packard Development Company, L.P. Board-level EMI shield that adheres to and conforms with printed circuit board component and board surfaces
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JP4096605B2 (ja) * 2002-04-23 2008-06-04 日本電気株式会社 半導体装置および半導体装置のシールド形成方法
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WO2013150676A1 (ja) * 2012-04-03 2013-10-10 三菱電機株式会社 Ｅｍｃシールド装置
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CN108029222B (zh) * 2015-09-18 2020-08-28 东丽株式会社 电子设备壳体
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Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59112973U (ja) * 1983-01-20 1984-07-30 富士通株式会社 高周波用混成集積回路のケ−ス格納構造
US5557064A (en) * 1994-04-18 1996-09-17 Motorola, Inc. Conformal shield and method for forming same
JPH10229289A (ja) * 1997-02-24 1998-08-25 Sega Enterp Ltd ノイズシールド構造を備える電子機器
JP2002344172A (ja) * 2001-05-16 2002-11-29 Matsushita Electric Ind Co Ltd 無線端末装置
JP2008005461A (ja) * 2006-05-24 2008-01-10 Sharp Corp 衛星信号用コンバータ、アンテナ装置および衛星放送受信装置
JP2018060991A (ja) * 2016-09-28 2018-04-12 住友ベークライト株式会社 封止用フィルム、電子部品搭載基板の封止方法および封止用フィルム被覆電子部品搭載基板

Also Published As

Publication number Publication date
JP7562526B2 (ja) 2024-10-07
JPWO2020255790A1 (https=) 2020-12-24
US11997840B2 (en) 2024-05-28
US20220322584A1 (en) 2022-10-06

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