WO2019230170A1 - 車載用電子装置 - Google Patents

車載用電子装置 Download PDF

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Publication number
WO2019230170A1
WO2019230170A1 PCT/JP2019/013252 JP2019013252W WO2019230170A1 WO 2019230170 A1 WO2019230170 A1 WO 2019230170A1 JP 2019013252 W JP2019013252 W JP 2019013252W WO 2019230170 A1 WO2019230170 A1 WO 2019230170A1
Authority
WO
WIPO (PCT)
Prior art keywords
cover
circuit board
case
vehicle
electronic device
Prior art date
Application number
PCT/JP2019/013252
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
侯宏 松岡
Original Assignee
株式会社デンソー
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 株式会社デンソー filed Critical 株式会社デンソー
Publication of WO2019230170A1 publication Critical patent/WO2019230170A1/ja

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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
    • H05K5/02—Details
    • H05K5/0212—Condensation eliminators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • 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
    • H05K5/02—Details
    • H05K5/03—Covers

Definitions

  • the present disclosure relates to an in-vehicle electronic device mounted on a vehicle such as an automobile.
  • various electronic devices such as a display unit and an engine control ECU are mounted on a vehicle such as an automobile.
  • This type of electronic device is configured by housing a circuit board in a case, but in particular, there is a device that includes a cooling fan and takes outside air into the case to cool components.
  • a cooling fan takes outside air into the case to cool components.
  • condensation may occur on the surface of the circuit board, which may lead to corrosion. Therefore, conventionally, a moisture-proofing agent is generally applied to a portion on the circuit board where there is a risk of condensation.
  • Patent Document 1 in the optical disc apparatus, protection made of a thin stainless steel plate is considered. Providing a cover is disclosed.
  • Patent Document 2 discloses that, in a digital camera, the optical filter is covered with an elastomer such as a rubber material in order to prevent dust from entering the optical filter portion.
  • JP 2004-110973 A Japanese Patent No. 5901347
  • the present disclosure is intended to provide an in-vehicle electronic device that can effectively protect a circuit board from dew condensation, dust, and the like, but can simply complete the configuration for that purpose.
  • the in-vehicle electronic device is an electronic device mounted on a vehicle, and covers a case, a circuit board provided in the case, and at least a part of the circuit board.
  • a protective cover provided on the surface of the case.
  • the cover is made of a molded product of a plastic sheet, and integrally includes a front-side protrusion and a back-side protrusion, and the front-side protrusion is an inner part of the case. Abutting against the wall surface, the back side protrusion is provided in a state of abutting against the surface of the circuit board.
  • the circuit board is covered with the protective cover, it is possible to prevent condensation on the circuit board and prevent dust from adhering.
  • the protective cover is formed of a molded product of a plastic sheet, a three-dimensional shape following the surface shape of the circuit board can be easily formed. Therefore, the cover itself can be thinned and arranged with a small clearance. Moreover, it can be made inexpensively. Since the cover is made of an insulating material, it is a matter of course that, unlike a metal cover, even if the clearance between the circuit board and the circuit board is reduced, the problem of poor insulation does not occur.
  • FIG. 1 shows an embodiment and is an exploded perspective view of an in-vehicle electronic device.
  • FIG. 2 is a perspective view of the main part with the second case removed
  • FIG. 3 is a perspective view of a state in which a cover is disposed on the second circuit board
  • FIG. 4 is a cross-sectional view showing the surface side protrusion portion.
  • FIG. 5 is a cross-sectional view showing the rear surface side protruding portion.
  • a vehicle-mounted electronic device 1 (hereinafter simply referred to as “electronic device 1”) according to the present embodiment is composed of, for example, a display unit that constitutes a navigation system, and is mounted on a central portion of an instrument panel of an automobile.
  • the liquid crystal panel side that is disposed on the front side, that is, the front side in an actual vehicle-mounted state, that is, in a used state, is shown in a form in which the liquid crystal panel is placed downward.
  • FIG. 1 schematically shows the overall appearance of the electronic device 1.
  • the electronic device 1 is configured by housing circuit boards 3 and 4 formed by mounting various components on a printed wiring board in a case 2.
  • two circuit boards 3 and 4 are provided in the case 2, of which the front side in the figure, that is, the lower side circuit board in the use state, is the first circuit board 3, the back side,
  • the upper circuit board is referred to as a second circuit board 4 in use.
  • the case 2 has a substantially rectangular box shape that is thin in the vertical direction in the figure, that is, in the front-rear direction in the state of use, and the lower first case 5 in the figure and the upper second case 6 in the figure are abutted and joined. Configured.
  • the first case 5 is made of, for example, plastic and has a thin, substantially rectangular box shape with an upper surface opened in the figure.
  • a liquid crystal panel is provided on the lower surface side of the first case 5, that is, on the front surface side when the vehicle is mounted.
  • the second case 6 is made of, for example, a metal and has a rectangular lid shape whose bottom surface is opened in the figure, and is provided so as to close the opening part on the top surface in the figure of the first case 5.
  • a fan mounting portion 6a is provided at the center of the second case 6, and a cooling fan device (not shown) is mounted.
  • the second case 6 is provided with an opening 6b or the like in which a plurality of connectors 8 (only part of which are shown) for external connection are disposed.
  • the extension part 6c extended to the near side by the figure is integrally provided in the lower part of the front end.
  • an external airflow inlet 7 is provided between the first case 5 and the extended portion 6c of the second case 6 on the front surface, that is, in the use state in the drawing of the case 2, at the bottom surface.
  • the first circuit board 3 has a horizontally long shape, and a plurality of components 9 (only a part thereof) constituting an electric circuit are mounted on the upper surface thereof. ing.
  • the first circuit board 3 is disposed on the near side in the figure in the first case 5 of the case 2, and therefore the upper surface portion of the first circuit board 3 is located at a portion facing the external air flow inlet 7.
  • the second circuit board 4 has a substantially square shape larger in the front-rear direction than the first circuit board 3 in the figure, and the first circuit board 3 in the first case 5 of the case 2. It is arrange
  • the connector 8 is mounted on the second circuit board 4.
  • a protective cover 11 is provided so as to cover the upper surface of the first circuit board 3 among the circuit boards 3 and 4.
  • the cover 11 is a molded product of a plastic sheet.
  • the cover 11 has a shape that covers the entire upper surface of the first circuit board 3 including the electronic components 9 on the upper surface of the first circuit board 3 so as to cover almost the entire upper surface with a slight clearance. It is formed in a rectangular lid shape.
  • the plastic sheet constituting the cover 11 is made of, for example, polypropylene or PP sheet or film having a thickness of 0.5 mm, and the cover 11 is formed by so-called vacuum forming.
  • vacuum molding is a method in which a sheet is heated and softened, and the sheet is molded by being brought into close contact with the surface of a mold by vacuuming.
  • an opening 11 a is formed in the cover 11 for a part 9 having a large height.
  • the component 9 is disposed so as to protrude upward from the opening 11a.
  • the cover 11 is integrally formed with a front side protrusion 12 positioned on the front surface side, and is integrally formed with a back surface protrusion 13 positioned on the back surface side.
  • one surface-side protruding portion 12 is provided at a position along the center line C of the front side portion of the cover 11, for example, in a form that bulges in a circle with a diameter of about 4 mm. ing.
  • the projecting dimension in the thickness direction (upward in the drawing) of the front side protruding portion 12 is, for example, about 0.6 mm.
  • the front end of the surface side protrusion 12 abuts on the case 2, that is, the inner wall surface of the extension 6 c of the second case 6.
  • each of the two rear surface protruding portions 13 is provided side by side in the horizontal direction at a position symmetrical to the left and right with respect to the center line C in the front end portion of the cover 11. It has been.
  • These back side protrusions 13 are formed so that the tip is rounded and protrudes to the back side, and the protruding dimension in the thickness direction (downward in the figure) is, for example, about 0.6 mm.
  • These back side protrusions 13 are in contact with the surface of the first circuit board 3 at their tips.
  • the cover 11 is sandwiched and held between the second case 6 and the first circuit board 3.
  • the amount of interference in the height direction in the drawing of the front surface side protruding portion 12 and the back surface side protruding portion 13 is, for example, about 0.3 mm.
  • screw insertion holes are formed in the first circuit board 3 at the corners on both sides and on the other corners.
  • the screw boss portion (not shown) formed on the inner wall portion of the first case 5 is fixed by screws 14 such as screws.
  • the cover 11 is also formed with screw insertion holes 11 b at four corners or the like at positions overlapping the screw insertion holes of the first circuit board 3. .
  • the cover 11 is fixed to the first case 5 together with the first circuit board 3 by so-called co-tightening with the screws 14.
  • the operation and effect of the electronic device 1 configured as described above will be described.
  • the first circuit board 3 is covered with the protective cover 11, thereby preventing condensation on the first circuit board 3 and preventing dust from adhering.
  • the cover 11 is formed of a molded product of a plastic sheet, a three-dimensional shape following the surface shape of the first circuit board 3 can be easily formed.
  • the cover 11 can be disposed with a small clearance and a small clearance.
  • the cover 11 can be made inexpensively. Since the cover 11 is made of an insulating material, it is a matter of course that the problem of insulation failure does not occur even if the clearance between the cover 11 and the first circuit board 3 is reduced, unlike a metal cover.
  • the plastic cover 11 when the plastic cover 11 is provided in the case 2, there is a concern about the generation of vibration sound of the cover 11 due to vehicle vibration.
  • the front side protrusion 12 provided on the front side of the cover 11 contacts the inner wall surface of the extension 6c of the second case 6, and the back side protrusion 13 provided on the back side of the cover 11 is the first. It contacts the surface of the circuit board 3.
  • the cover 11 is sandwiched and held between the case 2 and the first circuit board 3, and the vibration of the cover 11 can be regulated to prevent the generation of abnormal noise. Therefore, according to the present embodiment, while the circuit board 3 can be effectively protected from dew condensation, dust, and the like, it is possible to obtain an excellent effect that the configuration for that can be easily completed.
  • a fan device is provided, and the outside air is taken in from the outside air flow inlet 7 provided in the case 2.
  • the cover 11 is provided so as to cover the upper surface of the first circuit board 3, which is a portion facing the external air flow inlet 7.
  • the surface portion of the first circuit board 3, which is the portion where condensation is most likely to occur in the case 2 can be covered with the cover 11. Therefore, even if dew condensation occurs, it is on the surface side of the cover 11, so that dew condensation on the first circuit board 3 and problems associated therewith can be prevented in advance.
  • one front side protruding portion 12 is provided at a position along the center line C in the cover 11, and a plurality of back side protruding portions 13 are arranged on the left and right sides of the center line C of the cover 11. It was arranged at a symmetrical position. As a result, the cover 11 is stably held between the case 2 and the first circuit board 3.
  • polypropylene is adopted as the plastic sheet constituting the cover 11.
  • Polypropylene as a material is inexpensive and lightweight, has excellent insulating properties, and can obtain a certain strength, that is, high rigidity even with a thin sheet. Good formability such as vacuum forming. Advantages such as being stronger and more stable against heat and temperature change than rubber or the like, and having a smaller heat capacity than metal can be obtained.
  • the cover 11 when the cover 11 is attached, the first case 5 of the case 2 is screwed together with the first circuit board 3, so-called joint fastening.
  • the cover 11 was made from PP, you may comprise from a polyethylene terephthalate, ie, PET, and can obtain the effect
  • the present invention can be applied to various electronic devices for vehicles of various uses and types such as an engine ECU.
  • various changes can be made to the shape of the case and the arrangement of the external airflow inlet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mechanical Engineering (AREA)
  • Casings For Electric Apparatus (AREA)
PCT/JP2019/013252 2018-05-30 2019-03-27 車載用電子装置 WO2019230170A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018103502A JP7192252B2 (ja) 2018-05-30 2018-05-30 車載用電子装置
JP2018-103502 2018-05-30

Publications (1)

Publication Number Publication Date
WO2019230170A1 true WO2019230170A1 (ja) 2019-12-05

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PCT/JP2019/013252 WO2019230170A1 (ja) 2018-05-30 2019-03-27 車載用電子装置

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JP (1) JP7192252B2 (enrdf_load_stackoverflow)
WO (1) WO2019230170A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023023700A1 (en) * 2021-08-25 2023-03-02 Redarc Technologies Pty Ltd Electronics housing assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7548177B2 (ja) * 2021-09-27 2024-09-10 株式会社デンソー 制御装置
JP2023064554A (ja) * 2021-10-26 2023-05-11 マツダ株式会社 車両用演算装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009087554A (ja) * 2007-09-27 2009-04-23 Hitachi Maxell Ltd 電池パック
JP2012132432A (ja) * 2010-11-30 2012-07-12 Panasonic Corp インバータ装置一体型電動圧縮機
JP2017130335A (ja) * 2016-01-20 2017-07-27 アルプス電気株式会社 電子機器

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013105965A (ja) * 2011-11-16 2013-05-30 Daikin Ind Ltd 電装品のシール構造

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009087554A (ja) * 2007-09-27 2009-04-23 Hitachi Maxell Ltd 電池パック
JP2012132432A (ja) * 2010-11-30 2012-07-12 Panasonic Corp インバータ装置一体型電動圧縮機
JP2017130335A (ja) * 2016-01-20 2017-07-27 アルプス電気株式会社 電子機器

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023023700A1 (en) * 2021-08-25 2023-03-02 Redarc Technologies Pty Ltd Electronics housing assembly
EP4384791A4 (en) * 2021-08-25 2025-07-23 Redarc Tech Pty Ltd ELECTRONIC BOX ASSEMBLY

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JP2019206295A (ja) 2019-12-05
JP7192252B2 (ja) 2022-12-20

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