WO2014069644A1 - 車載用回路基板内蔵装置 - Google Patents
車載用回路基板内蔵装置 Download PDFInfo
- Publication number
- WO2014069644A1 WO2014069644A1 PCT/JP2013/079788 JP2013079788W WO2014069644A1 WO 2014069644 A1 WO2014069644 A1 WO 2014069644A1 JP 2013079788 W JP2013079788 W JP 2013079788W WO 2014069644 A1 WO2014069644 A1 WO 2014069644A1
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- WIPO (PCT)
- Prior art keywords
- circuit board
- electrode
- back cover
- peripheral electrode
- circuit substrate
- Prior art date
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/0026—Casings, cabinets or drawers for electric apparatus provided with connectors and printed circuit boards [PCB], e.g. automotive electronic control units
- H05K5/0047—Casings, cabinets or drawers for electric apparatus provided with connectors and printed circuit boards [PCB], e.g. automotive electronic control units having a two-part housing enclosing a PCB
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/002—Casings with localised screening
- H05K9/0039—Galvanic coupling of ground layer on printed circuit board [PCB] to conductive casing
Definitions
- the present invention relates to a circuit board built-in device that incorporates an electronic circuit board such as an MPU (Micro Processor Unit), and in particular, has been improved to prevent malfunction due to electrical noise (electrostatic noise, magnetic noise, electromagnetic wave noise) in a vehicle.
- the present invention relates to an in-vehicle circuit board built-in device.
- noise countermeasures are taken so that the built-in computer does not malfunction due to electromagnetic noise such as engine ignition noise of vehicles.
- electromagnetic noise such as engine ignition noise of vehicles.
- the entire circuit board of the electronic control device is covered with a metal case, and the case is grounded to prevent electromagnetic noise from entering.
- metal cases are required to be smaller and lighter in order to improve vehicle fuel efficiency and reduce costs, and some metal covers are replaced with resin covers. Even when a resin cover is used, it is necessary to prevent electromagnetic noise from entering.
- the “in-vehicle electronic control unit device” described in Patent Document 1 a box-shaped resin case, an electronic circuit board, and a metal cover are combined. Then, using the electronic circuit board as a multilayer wiring board, any one of the entire surface of the substrate, the entire surface of the back surface, and the entire surface of the inner layer is used as a metal film ground layer. The ground layer surface and the metal cover cover cover the entire electronic circuit board to prevent electromagnetic wave noise from entering an electronic component (CPU) or the like. Further, in the “electronic device” described in Patent Document 2, the entire electronic circuit board disposed in the all-resin case is covered with a metal mesh molded product to prevent electromagnetic noise from entering.
- the entire multilayer wiring circuit board described above is used as the ground layer, and the in-vehicle electronic control unit device (circuit board built-in device) in which electronic components are arranged between the ground layer and the metal cover prevents electromagnetic noise from entering. Can be expected to do. In addition, it is expected that electromagnetic noise can be prevented from entering by covering the entire electronic circuit board of the electronic apparatus (circuit board built-in apparatus) containing the electronic circuit board with a wire mesh.
- the present invention makes it relatively easy to install an on-vehicle circuit board built-in device that prevents electrical noise from entering the electronic component (CPU) from the outside and hardly generates stray capacitance with the signal line (internal wiring).
- the purpose is to provide a simple configuration.
- One embodiment of the present invention for solving the above problems includes a circuit board on which electronic components are mounted, a nonconductive housing that covers one surface of the circuit board, and a conductive back cover that covers the other surface of the circuit board.
- a circuit board built-in device comprising: a circuit to be shielded that is disposed on the other surface side of the circuit board and is to be shielded from external noise, and the circuit board is provided so as to go around the outer edge of the circuit board.
- a peripheral electrode surrounding the shielded circuit, and the peripheral electrode and the back cover are in contact with each other and are electrically connected so as to go around the outer edge of the circuit board.
- the peripheral electrode can be formed, for example, by patterning simultaneously with a wiring layer (for example, a metal plating layer) on the circuit board.
- the peripheral electrode may be formed by applying a conductive paste material in a ring shape on a base substrate of a circuit board or an insulating film covering the circuit, and performing a heat treatment or the like.
- the surrounding electrode formed in a ring shape or a frame shape on the outer periphery of the electric circuit board and the conductor back cover cover the target electric circuit (pseudo) to form a Faraday cage
- An electromagnetic noise shielding target circuit such as a processor is surrounded by a shielding object (grounding body).
- the shield is connected to a suitably selected reference potential (for example, a circuit power supply neutral line Vss (for example, 0 volts), a circuit power supply hot line Vdd, a vehicle body frame potential, etc.) and acts as an electrostatic shield.
- the conductive shield (back cover, surrounding electrode) generates an eddy current that cancels this magnetic field against the high-frequency magnetic field of the disturbance and acts as an electromagnetic shield.
- the peripheral electrodes on the outer periphery of the circuit board are arranged so as not to overlap with the signal wiring of the internal circuit of the board, it is possible to avoid the generation of stray capacitance between them.
- a circuit board on which electronic components are mounted a non-conductive housing that covers one surface of the circuit board, and a conductive back cover that covers the other surface of the circuit board.
- the circuit to be shielded is arranged on the other surface side of the circuit board and should be shielded from external noise, and provided on the other surface side of the circuit board so as to go around the outer edge of the circuit board.
- the surrounding electrode exposed from the insulating film in an annular or frame shape on the outer periphery of the electric circuit board and the back cover of the conductor cover the target electric circuit to form a (pseudo) Faraday cage
- the structure which surrounds electromagnetic wave noise shielding object circuits, such as a microprocessor, with a shield (grounding body) is obtained.
- the shield is connected to a reference potential (or to the vehicle body) and acts as an electrostatic shield.
- the conductive shield back cover, surrounding electrode
- the peripheral electrode can be formed by exposing a grounding-system electrode Vss (so-called solid earth) of the so-called solid pattern of the signal system wiring and power supply wiring of the circuit board along the outer edge of the circuit board from the insulating film. That is, the peripheral electrode only needs to be exposed in a ring shape, and the peripheral electrode itself does not need to be formed in a ring shape (for example, a combination of solid pattern pieces may be used). Further, it may be applied to electrode wiring (so-called solid V) of the power supply system (Vdd).
- Vss grounding-system electrode
- Vdd power supply system
- the peripheral electrode may be composed of one annular electrode or a plurality of electrodes arranged in an annular shape.
- the surrounding electrode can be prevented from entering electric noise from the outside by making it one continuous annular electrode, a part thereof may be separated. Thereby, it is possible to prevent a loop current that makes a round of the annular electrode from flowing. A similar effect can be obtained even if the plurality of spaced apart electrodes are formed in a ring shape (the surrounding electrodes may be formed into small pieces).
- the circuit board can be constituted by a multilayer (multiple layers) wiring board. Also in this case, the surrounding electrode can be formed in the same manner as described above.
- a part of the wiring layer of the plurality of electrodes forming a ring shape can be replaced with another wiring layer, and the connection between the external wiring and the wiring of the internal electric circuit (three-dimensional connection between the external connection wiring and the circular electrode) There is an advantage that it is possible to perform (intersection).
- the surrounding electrode is provided on the other side of the circuit board and is in contact with the back cover. Accordingly, since the surrounding electrode can come into contact with the back cover in an annular shape, the surrounding electrode and the back cover become equipotential, which is convenient for electrical noise shielding (static electricity, magnetism, electromagnetic waves).
- the circuit board is a multilayer wiring circuit board, and the peripheral electrode or the inner electrode is formed over any layer or a plurality of layers of the multilayer wiring circuit board.
- the peripheral electrode or the inner electrode is formed over any layer or a plurality of layers of the multilayer wiring circuit board.
- the peripheral electrode when the peripheral electrode is formed on the surface on the other surface side of the circuit board, it can be brought into full contact with the back cover (solid contact).
- the peripheral electrode is formed on the surface on one side of the circuit board, it can be electrically connected via a screw or the like for fixing the back cover and the circuit board.
- the peripheral electrode is formed in the wiring layer or the ground wiring layer inside the circuit board (multilayer wiring), the peripheral electrode and the back cover can be electrically connected through a contact hole formed in the circuit board. .
- the degree of freedom of wiring patterns increases. Draw out external connection wiring and connect connectors easily.
- the circuit board further includes an inner electrode disposed on the other surface side of the circuit board in a pattern independent of the peripheral electrode, the inner electrode being electrically connected to the back cover.
- an inner electrode disposed on the other surface side of the circuit board in a pattern independent of the peripheral electrode, the inner electrode being electrically connected to the back cover.
- the inner electrode is formed on the other surface of the circuit board.
- the inner electrode can directly contact the back cover with a certain area, and the potential on the inner electrode can be made uniform.
- the inner electrode (island electrode) may be formed on the surface on the one surface side of the circuit board.
- the inner electrode and the back cover can be electrically connected and grounded by a (metal) screw or the like for fixing the circuit board to the back cover.
- the circuit board may be a multilayer wiring board, an inner electrode may be formed on the inner layer, and grounded through a contact hole or the like. Even with such a configuration, a noise shielding effect can be expected.
- a high-frequency operation circuit such as a microprocessor is provided in a Faraday cage constituted by a peripheral electrode and a conductive back cover provided so as to go around the outer edge of the circuit board. Since the configuration is arranged, it is preferable that malfunction due to external noise (static electricity, magnetism, electromagnetic wave noise) is reduced without adding special parts.
- the peripheral electrode ground electrode
- parasitic capacitance such as stray capacitance is not generated between the internal wiring of the circuit board and the peripheral electrode, and the condition is good.
- the present invention can be applied not only to a multilayer wiring board but also to a double-sided wiring board or a single-sided wiring board and is good.
- an earth area is formed in an annular shape in the outer peripheral area of the electric circuit board, and the entire ring-shaped earth area and the inlet portion of the metal cover are brought into close contact (as much as possible) and are similar to the Faraday cage.
- This structure avoids electromagnetic interference (electric noise).
- FIG. 1 is an explanatory view for explaining an embodiment of a circuit board built-in device according to the present invention
- FIG. FIG. 2B is a cross-sectional view illustrating an example of a circuit board built-in device.
- the circuit board is shown in a cross section in the AA ′ direction of FIG.
- Corresponding parts are denoted by the same reference numerals in the drawings.
- the substrate built-in device 1 includes a circuit board 10 on which electronic components such as a CPU are mounted, a resin (non-conductive) housing 20 that covers the surface (one surface) of the circuit board 10, and the back surface of the circuit board 10.
- a metal (conductive) back cover 30 that covers (other surface) (see FIG. 1B).
- the board built-in device 1 includes, for example, an electronic circuit including a circuit board on which high-frequency operation components (IC, CPU, GPU, etc.) for controlling an airbag device, a seat belt device, a radar device, a night vision device and the like mounted on a vehicle are mounted. It corresponds to a control device.
- the present invention is not limited to these control devices, and can be applied to a device incorporating an electric circuit board that should prevent the influence of external noise.
- FIG. 1A shows the back side of the circuit board 10.
- the circuit board 10 may be a single-sided circuit board, a double-sided circuit board, or a multilayer circuit board.
- the circuit board 10 may be any of a phenol board, a glass / epoxy board, a glass composite board, a Teflon (registered trademark) board, a ceramic board, and the like.
- a plurality of internal circuits 101 to 106 are provided on the circuit board 10.
- IC 1 is arranged in the internal circuit 101
- IC 2 is arranged in the internal circuit 102
- IC 3 is arranged in the internal circuit 103.
- IC1 to IC3 which are high-frequency operation components, are a CPU, an image signal processor, an audio signal processor, an ASIC (Application Specific Integrated Circuit), and the like, and operate with a high frequency clock signal.
- the high-frequency operation component is not limited to a digital circuit, and may be an analog IC such as an operational amplifier in which external noise is a problem.
- a peripheral electrode 111 is formed around the internal circuits 101 to 106 inside the outer edge of the circuit board 10 (outer peripheral portion of the substrate).
- the width of the surrounding electrode is about 1 to 5 [mm], but the effect has been confirmed even if it is 1 [mm] or less, and is not limited to a specific value (see FIG. 7 described later).
- the thickness (film thickness) of the peripheral electrode 111 is appropriately set to about 10 to 40 [ ⁇ m], for example, but this is not limited to a specific value.
- the width and film thickness of the peripheral electrode 111 are determined in consideration of the frequency of external noise.
- the peripheral electrode 111 is formed by, for example, applying silver paste to the outer peripheral region of the insulating substrate (or the insulating layer of the substrate) by screen printing and performing heat treatment.
- the peripheral electrode 111 may be formed by metal plating and etching on the circuit board 10.
- the peripheral electrode 111 may be formed simultaneously with the wiring pattern of the internal circuit. As will be described later, the peripheral electrode 111 has various patterns and there are a plurality of formation methods, so that it is appropriately selected (see FIG. 4).
- the surface of the circuit board 10 is covered with a resin housing 20. Large parts such as coils and capacitors are mainly arranged in the space covered with the resin housing (not shown).
- the back surface of the circuit board 10 is covered with a concave back cover 30 made of metal.
- the housing 20 is fixed by fitting the inner periphery of the opening to the outer periphery of the frame of the back cover. Electronic circuit components IC1 to IC3 to be protected from external noise are arranged on the back surface of the circuit board 10.
- the back cover 30 is made of, for example, an aluminum alloy (aluminum die casting).
- the circuit board 10 is provided with screw fixing through holes 141 to 144 at four corners.
- the screws 151, 152, 153, and 154 have a rectangular shape of the back cover 30. It is attached to the upper surface 301 of the housing frame that forms the frame.
- the width of the frame upper surface 30 is set to about 0.5 to 2 [mm], for example. Assembly is easy because the width of the peripheral electrode 111 is relatively wider than the width of the upper surface 301.
- the peripheral electrode 111 on the back surface side of the circuit board 10 is in close contact with and electrically connected to the frame upper surface 301 in a square frame shape.
- the back cover 30 is grounded to the ground or the frame of the vehicle body, and the surrounding electrode 111 is set to the ground potential.
- the electronic components (IC1 to IC3) to be shielded from external noise are placed in a (pseudo) Faraday cage constituted by the peripheral electrode 111 and the back cover 30.
- “pseudo” means that the wiring patterns of the internal circuits 101 to 106 and the pattern of the peripheral electrode 111 do not overlap, and the electronic components IC1 to IC3 are spatially completely shielded by the conductor. It means not.
- the wiring patterns of the internal circuits 101 to 106 and the pattern of the peripheral electrode 111 not overlapping, it is possible to avoid the formation of stray capacitance between them.
- the present inventors have found that even in such a pseudo Faraday cage state (annular outer peripheral electrode 111 having an opening at the center), there is an effect for preventing malfunction due to external noise.
- +25 [kV] and ⁇ 25 [kV] were alternately generated by a static electricity generator, and led out in the vicinity of the circuit board built-in device 1 (the back cover 30) by a probe. It was observed whether or not malfunction occurred in the test operation of the IC (CPU) in such an extremely severe condition that would not be normal.
- FIG. 2 is an explanatory view for explaining another embodiment of the present invention.
- the peripheral electrode 111 is constituted by a wiring layer of an internal circuit, in particular, a solid earth electrode Vss (or a solid Vdd).
- Vss solid earth electrode
- a part of the insulating layer 12 covering the wiring layer is removed along the outer periphery of the circuit board 10 (or the insulating layer 12 is appropriately patterned), and the solid earth electrode Vss of the wiring layer of the internal circuit is annularly formed along the outer periphery of the substrate.
- the peripheral electrode 111 is formed by being exposed.
- the electrode shape of the exposed portion from the insulating layer 12 may be annular, and the surrounding electrode 111 itself may not be annular (the surrounding electrode 111 may be formed of an assembly of solid earth electrode pieces. ).
- the frame-shaped upper surface portion 301 of the metal cover 30 and the annularly exposed portion of the peripheral electrode 111 are in annular contact and are electrically connected to be held at the reference potential.
- the reference potential is appropriately selected, for example, a ground potential Vss, a power supply potential Vdd, a vehicle frame potential, and the like.
- Other configurations are the same as those of the first embodiment (FIG. 1).
- FIG. 3 is an explanatory view for explaining another embodiment of the present invention.
- parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
- the peripheral electrode 111 is constituted by a plurality of electrode pieces 121 to 130.
- the electrode pieces 121 to 130 may be the solid earth electrode pieces described above.
- the electrode pieces 121 to 130 are separated from each other, in a state where the apparatus is assembled, the electrode pieces 121 to 130 are electrically connected by the upper surface portion 301 of the metal cover 30 and set to the ground potential.
- a protective effect against external noise can be obtained.
- By providing a gap between the peripheral electrodes 111 it is possible to connect the external wiring and the internal wiring (providing a connection wiring pattern) using this gap.
- the configuration is advantageous even when the surrounding electrodes need to be separated due to structural needs such as a step of the casing and strength maintenance. Further, when a gap is provided in the peripheral electrode 111, no loop current flows in the annular peripheral electrode 111 portion, so that it is possible to prevent the generation of an induced current due to an external magnetic wave.
- Example 4 4A to 4E are explanatory views for explaining an example of the arrangement of the peripheral electrodes 111 on the circuit board 10 described above, and a part of the circuit board 10 taken out from the device 1 is a sectional view. Show. In the figure, parts corresponding to those in FIG. 1 or FIG.
- FIG. 4A shows an example in which a connector 160 is connected to the end of the circuit board 10.
- the connector 160 electrically connects the internal circuit and the external wiring.
- the peripheral electrode 111 is disposed inside the outer edge of the circuit board 10.
- FIG. 4B shows an example in which the peripheral electrode 111 is formed using the same conductor film (for example, a copper thin film) as the signal wiring layer 115 of the internal circuit of the circuit board 10.
- the peripheral electrode 111 can be formed by patterning a conductor film in a ring shape. Further, one or a plurality of solid earth electrodes patterned together with the signal wiring 115 can be configured to be exposed from the insulating layer 12 in a ring shape.
- FIG. 4C shows an example in which the peripheral electrode 111 is formed on the insulating layer 12 on the back surface side of the circuit board 10 by plating or printing application of silver paste (conductive paste).
- the circuit board 10 is composed of a multilayer wiring board.
- the peripheral electrode 111 is formed by using the conductor film of the signal wiring layer 115 of the plurality of layers.
- the peripheral electrode 111 is formed by exposing a portion corresponding to the peripheral electrode 111 of the signal wiring layer 115 from the insulating film 12 in a ring shape.
- the peripheral electrode 111 may be formed by exposing one or more solid earth electrode patterns.
- the circuit board 10 is constituted by a multilayer wiring board.
- the peripheral electrode 111 is formed by using the wiring layer 116 of the power supply wiring (Vdd, Vss) of the plurality of layers.
- a pattern corresponding to the peripheral electrode 111 is formed in the same wiring layer together with the wiring pattern of the power supply Vss, and a part of the wiring layer 115 and the insulating layer 12 on the outer periphery of the circuit board 10 is removed or the part is not laminated.
- the peripheral electrode 111 is exposed.
- the peripheral electrode 111 may be formed by exposing one or more solid earth electrode pieces in an annular shape along the outer periphery of the circuit board.
- FIG. 5 shows another embodiment of the present invention. In the figure, parts corresponding to those in FIG. 1 or FIG.
- an inner electrode (island electrode) 132 independent of the surrounding electrode 111 is formed at the center of the circuit board 10 as shown in FIG. Further, as shown in FIG. 5B, a protrusion 310 corresponding to the inner electrode 132 is formed in the central region of the back cover 30.
- the circuit board 10 is fixed to the back cover 30 with five screws 151 to 155 in a state where the apparatus is assembled.
- the inner electrode 132 of the circuit board 10 is in close contact with the upper surface of the protrusion 310 at the center of the back cover 30 by a screw 155 and is electrically connected to the back cover 30. When the back cover 30 is grounded, the peripheral electrode 111 and the inner electrode 132 of the circuit board 10 become the ground potential.
- an insulating film 12 (see FIGS. 2 and 4) covering the wiring layer is formed, and the inner electrode 132 formed on the signal wiring layer 115 by opening the insulating layer 12. May be exposed. That is, the inner electrode 132 may be covered with the insulating film 12 or exposed from the insulating film 12. The inner electrode 132 may be formed on the insulating film 12 by printing or plating (see FIG. 4C).
- the pseudo Faraday cage is constituted by an inner electrode 132 disposed in the opening of the peripheral electrode 111 in addition to the conductive back cover 30 and the peripheral electrode 111 of the circuit board 10.
- the pseudo Faraday cage having a higher shielding effect can be configured by increasing the electromagnetic shielding range.
- a conductor region that further absorbs noise is set inside the surrounding electrode, and static electricity induced inside the circuit board due to external electric field fluctuations is absorbed by grounding the substrate internal region (to make a reference potential), thereby causing the substrate potential Is stabilized and the noise shielding effect is improved.
- FIG. 6 shows another embodiment of the present invention.
- parts corresponding to those in FIGS. 1, 4 and 5 are denoted by the same reference numerals, and description thereof will be omitted.
- the peripheral electrode 111 and the inner electrode 132 of the circuit board 10 are connected via the bridge electrode 133, and the protrusion 310 is not provided (or not provided) at the center of the back cover 30. Good.) Although the internal circuit formation area is reduced on the back surface of the circuit board 10 by the amount of the bridge electrode 133 disposed, the back cover 30 similar to that shown in FIG. 1B or 2B can be used.
- FIG. 7 is an explanatory diagram for explaining a more desirable mode in each embodiment of the present invention.
- parts corresponding to those in FIG. 7 are identical to those in FIG. 7 in FIG. 7 in FIG. 7 in FIG. 7 in FIG. 7 in FIG. 7 in FIG. 7 in FIG. 7 in FIG. 7 in FIG. 7 in FIG. 7 in FIG. 7 in FIG. 7 in FIG. 7 in FIG. 7 in FIG. 7 in FIG. 7 in FIG. 7 in FIG. 7, parts corresponding to those in FIG.
- the peripheral electrode 111 is formed in an annular shape.
- This peripheral electrode 111 acts as a loop antenna.
- a noise current is generated in this loop, which may be easily affected by external noise. Therefore, in this embodiment, a gap G is formed in a part of the peripheral electrode 111 on the circuit board 10 so that no loop current is generated.
- the configuration is made such that the peripheral electrode 111 to be grounded and the area of the internal circuits 101 to 106 do not overlap each other, so that stray capacitance is hardly generated between the wiring of the peripheral electrode 111 and the internal circuits 101 to 106. ing.
- the entire surface of the circuit board (or multilayer wiring board) 10 is used as a ground electrode, the ground electrode and the internal circuit wiring overlap to easily generate stray capacitance, which is an unintended circuit in high-frequency signal propagation and signal processing. There is a problem that is configured. In this embodiment, it can be prevented.
- FIG. 8 is an explanatory view for explaining another embodiment of the present invention.
- parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
- FIG. 9 is an explanatory diagram for explaining another embodiment of the present invention.
- parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
- the partition electrode 135 is inserted into the peripheral electrode 111 on the circuit board 10 and the area of the internal circuits 101 to 106 is separated into two areas by a shield.
- the peripheral electrode 111 is arranged inside the end portion of the circuit board 10 to facilitate the attachment of the connector 160 to the circuit board 10 (see FIG. 4A).
- the peripheral electrode 111 is formed in a straight line or exposed, but may be curved.
- it can take various shapes corresponding to the frame of the back cover 30 to be cast, and is not limited to a specific shape.
- the Faraday cage is substantially formed by using the surrounding electrodes without covering the entire surface of the on-vehicle circuit board with the shield electrode or the wire mesh, it is specially manufactured. This makes it possible to eliminate (reduce) the influence of external noise on the circuit board without using a molded product or member (such as a metal mesh molded product or a special multilayer wiring board). In addition, the external radiation of electromagnetic noise generated by the circuit board is also suppressed (decreased), which is good.
- the present invention is a variety of devices that need to eliminate the influence of external noise (electromagnetic radiation noise) from an engine ignition system high-voltage power supply and the like while reducing the weight (using a resin cover) in an apparatus incorporating an electric circuit board for a vehicle. It can be applied to an on-vehicle circuit board built-in device. In addition, the present invention is not limited to the in-vehicle device but can be applied to a non-in-vehicle device. This method is suitable for preventing external noise from entering a circuit board built in the apparatus and suppressing radiation of electromagnetic noise generated by the built-in circuit board to the outside.
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Abstract
Description
周囲電極は、例えば、回路基板上の配線層(例えば、金属メッキ層)と同時にパターンニグすることによって形成することができる。また、周囲電極は導電性ペースト材料を回路基板のベース基板や回路を覆う絶縁膜上に環状に塗布し、加熱処理等することによって環状の電極を形成しても良い。
より好ましくは、上記周囲電極及び上記バックカバーは適宜に選択された基準電位点(回路電源のVss、Vdd、車体フレーム電位など)に接続され、周囲電極及びバックカバー電位の安定化が図られる。
図1は、本発明の回路基板内蔵装置の実施例を説明する説明図であり、同図(A)は、装置に内蔵される(電気)回路基板の例を説明する説明図であり、同図(B)は、回路基板内蔵装置の例を説明する断面図である。同断面図においては、回路基板は同図(A)のA-A’方向における断面で示している。各図において対応する部分には同一符号を付している。
発明者は、本発明に係る周囲電極111を備えるテスト基板のIC(CPU)の誤動作の発生回数と、周囲電極111を備えない比較例基板のIC(CPU)の誤動作の発生回数とを確かめるべく実験した。
図2は、本発明の他の実施例を説明する説明図である。同図において、図1と対応する部分には同一符号を付し、かかる部分の説明は省略する。
この例では、周囲電極111を内部回路の配線層、特にベタアース電極Vss(あるいはベタVdd)によって構成している。回路基板10の外周に沿って配線層を覆う絶縁層12を一部除去し(あるいは絶縁層12を適宜にパターニングして)、内部回路の配線層のベタアース電極Vssを基板外周に沿って環状に露出させて周囲電極111を形成している。
この例においては、絶縁層12からの露出部分の電極形状が環状であれば良く、周囲電極111自体は環状でなくとも良い(周囲電極111がベタアース電極片の集合体で構成されても良い。)。装置を組み立てた状態においては、金属カバー30の枠状の上面部301と周囲電極111の環状に露出した部分とが環状に接触して電気的に接続されて基準電位に保持される。基準電位は、例えば、接地電位Vss、電源電位Vdd、車両のフレーム電位など適宜に選定される。他の構成は実施例1(図1)と同様である。
図3は、本発明の他の実施例を説明する説明図である。同図において、図1と対応する部分には同一符号を付し、かかる部分の説明は省略する。
図4(A)乃至同図(E)は、上述した回路基板10上における周囲電極111の配置などの例を説明する説明図であり、装置1から回路基板10の部分を取り出して断面図で示している。同図において、図1又は図2と対応する部分には同一符号を付し、かかる部分の説明は省略する。
図5は、本発明の他の実施例を示している。同図において図1又は図2と対応する部分には同一符号を付しかかる部分の説明は省略する。
図6は、本発明の他の実施例を示している。同図において図1、図4及び図5と対応する部分には同一符号を付し、かかる部分の説明は省略する。
図7は、本発明の各実施例におけるより望ましい態様を説明する説明図であり、同図において図1と対応する部分には同一符号を付し、かかる部分の説明は省略する。
図8は、本発明の他の実施例を説明する説明図である。同図において図1と対応する部分には同一符号を付し、かかる部分の説明は省略する。
図9は、本発明の他の実施例を説明する説明図である。同図において図1と対応する部分には同一符号を付し、かかる部分の説明は省略する。
なお、上述した実施例では、周囲電極111は直線状に形成されあるいは露出されているが曲線的であっても良い。例えば、鋳造されるバックカバー30の枠に対応して各種の形状を取り得るものであり、特定の形状に限定されるものではない。
10 回路基板
12 絶縁層
20 ハウジング
30 バックカバー
101~106 内部回路
111 周囲電極
121~130 周囲電極(分離型)
132 内側電極
160 コネクタ
Claims (6)
- 電子部品が実装される回路基板と、
前記回路基板の一面を覆う非導電性のハウジングと、
前記回路基板の他面を覆う導電性のバックカバーと、を備える車載用回路基板内蔵装置であって、
前記回路基板の他面側に配置されて外部ノイズから遮蔽されるべき遮蔽対象回路と、
前記回路基板に当該回路基板の外縁部を一周するように設けられて前記遮蔽対象回路を囲む周囲電極と、を含み、
前記周囲電極と前記バックカバーとは前記回路基板の外縁部を一周するように接触して電気的に接続される、
ことを特徴とする車載用回路基板内蔵装置。 - 電子部品が実装される回路基板と、
前記回路基板の一面を覆う非導電性のハウジングと、
前記回路基板の他面を覆う導電性のバックカバーと、を備える車載用回路基板内蔵装置であって、
前記回路基板の他面側に配置されて外部ノイズから遮蔽されるべき遮蔽対象回路と、
前記回路基板の他面側に当該回路基板の外縁部を一周するように設けられて前記遮蔽対象回路を囲む周囲電極と、
前記回路基板の他面側を覆う絶縁層と、を含み、
前記絶縁層は前記周囲電極を前記回路基板の外縁部に沿って環状に露出し、前記周囲電極は当該露出部分で前記バックカバーと電気的に接続される、
ことを特徴とする車載用回路基板内蔵装置。 - 前記周囲電極は、一つの環状電極又は環状に配置された複数の電極によって構成される、ことを特徴とする請求項1又は2に記載の車載用回路基板内蔵装置。
- 前記周囲電極は、前記バックカバーと環状に又は線状に接触することを特徴とする請求項1乃至3のいずれかに記載の車載用回路基板内蔵装置。
- 更に、前記回路基板の他面側に前記周囲電極の内側であって当該周囲電極から独立したパターンで配置される内側電極を含み、
前記内側電極は前記バックカバーに電気的に接続される、ことを特徴とする請求項1乃至4のいずれかに記載の車載用回路基板内蔵装置。 - 前記周囲電極及び前記バックカバーは基準電位に接続される、ことを特徴とする請求項1乃至5のいずれかに記載の車載用回路基板内蔵装置。
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JP2015600062U JP3199715U (ja) | 2012-11-05 | 2013-11-01 | 車載用回路基板内蔵装置 |
CN201390000809.3U CN204652864U (zh) | 2012-11-05 | 2013-11-01 | 一种车载用电路板内置装置 |
DE212013000221.1U DE212013000221U1 (de) | 2012-11-05 | 2013-11-01 | Platineneinbauvorrichtung zur Anordnung in Fahrzeugen |
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JP2012243798 | 2012-11-05 | ||
JP2012-243798 | 2012-11-05 |
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WO2014069644A1 true WO2014069644A1 (ja) | 2014-05-08 |
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PCT/JP2013/079788 WO2014069644A1 (ja) | 2012-11-05 | 2013-11-01 | 車載用回路基板内蔵装置 |
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JP (1) | JP3199715U (ja) |
CN (1) | CN204652864U (ja) |
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WO (1) | WO2014069644A1 (ja) |
Cited By (3)
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WO2015197247A1 (de) * | 2014-06-25 | 2015-12-30 | Robert Bosch Gmbh | Vorrichtung zur ansteuerung von personenschutzmitteln und verfahren zur herstellung einer vorrichtung zur ansteuerung von personenschutzmitteln |
JP2016141173A (ja) * | 2015-01-30 | 2016-08-08 | 日立オートモティブシステムズ株式会社 | 車載用電子制御装置 |
US20170290140A1 (en) * | 2016-04-05 | 2017-10-05 | Harman International Industries, Inc. | Electromagnetic shield for an electronic device |
Families Citing this family (3)
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EP3487274A1 (en) * | 2017-11-20 | 2019-05-22 | Valeo Comfort and Driving Assistance | Electronic device comprising a structral piece with a cage positionned over an electronic component |
CN108362408B (zh) * | 2018-03-08 | 2021-07-02 | 苏州敏芯微电子技术股份有限公司 | 压力传感器及其制造方法 |
JP2021028934A (ja) | 2019-08-09 | 2021-02-25 | キヤノン株式会社 | プリント基板 |
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JP2004071629A (ja) * | 2002-08-01 | 2004-03-04 | Toshiba Corp | シールド構造およびシールド構造を有する電子機器 |
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2013
- 2013-11-01 DE DE212013000221.1U patent/DE212013000221U1/de not_active Expired - Lifetime
- 2013-11-01 CN CN201390000809.3U patent/CN204652864U/zh not_active Expired - Lifetime
- 2013-11-01 WO PCT/JP2013/079788 patent/WO2014069644A1/ja active Application Filing
- 2013-11-01 JP JP2015600062U patent/JP3199715U/ja not_active Expired - Lifetime
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JPH07240595A (ja) * | 1994-03-01 | 1995-09-12 | Pfu Ltd | シールド機能を備えたプリント板 |
JP2004071629A (ja) * | 2002-08-01 | 2004-03-04 | Toshiba Corp | シールド構造およびシールド構造を有する電子機器 |
JP2007207857A (ja) * | 2006-01-31 | 2007-08-16 | Nec Access Technica Ltd | 携帯端末用プリント基板及び携帯端末 |
JP2012005244A (ja) * | 2010-06-17 | 2012-01-05 | Denso Corp | 車載用電子制御ユニット装置 |
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WO2015197247A1 (de) * | 2014-06-25 | 2015-12-30 | Robert Bosch Gmbh | Vorrichtung zur ansteuerung von personenschutzmitteln und verfahren zur herstellung einer vorrichtung zur ansteuerung von personenschutzmitteln |
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JP2016141173A (ja) * | 2015-01-30 | 2016-08-08 | 日立オートモティブシステムズ株式会社 | 車載用電子制御装置 |
US20170290140A1 (en) * | 2016-04-05 | 2017-10-05 | Harman International Industries, Inc. | Electromagnetic shield for an electronic device |
US10462895B2 (en) * | 2016-04-05 | 2019-10-29 | Harman International Industries, Incorporated | Electromagnetic shield for an electronic device |
Also Published As
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JP3199715U (ja) | 2015-09-10 |
CN204652864U (zh) | 2015-09-16 |
DE212013000221U1 (de) | 2015-06-10 |
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