JP2016002804A - On-vehicle electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide on-vehicle electronic equipment capable of securing on-vehicle performance such as reduction of weight, vibration resistance, electromagnetic shield performance and dust-proof performance.SOLUTION: By using a resin housing 40, weight can be reduced and, by forming the housing in a cylindrical shape, strength as the housing can be secured and a media drive circuit substrate assembly 2 can be protected from dust, water and an attachment handling to a vehicle. By using a metal holder 30 having an area of the bottom surface or more of a media drive 10, substrate ground is reinforced, an electromagnetic noise occurring from a circuit substrate 20 can be reduced and an electromagnetic noise occurring from an FPC 12 and the media drive 10 can be shielded. Further, metal brackets 50, 60 retain the media drive 10 as a heavy weight matter, therefore, a load burden to the resin housing 40 is reduced and vibration resistance can be secured. Further, the sheet metal housing of the media drive 10 is connected to vehicle ground via the metal brackets 50, 60 and, thereby, the electromagnetic shield performance is improved.

Description

  The present invention relates to an in-vehicle electronic device incorporating a media drive.

A conventional in-vehicle electronic device has a configuration in which a circuit board, a media drive, and the like are attached to the inside of a sheet metal box body whose upper surface or front surface is opened, an opening is covered with a sheet metal lid, and a design panel is attached (for example, a patent Reference 1). In this configuration, since internal parts such as a circuit board are covered with a sheet metal casing, it is easy to ensure the strength against vibration of the vehicle, the electromagnetic shielding performance, and the dustproof performance.
In Patent Document 2 aimed at realizing weight reduction, a resin casing is used.

Japanese Utility Model Publication No. 3-61696 JP 2008-174129 A

  Since the resin casing of Patent Document 2 is divided into a lid and a box, there is a problem that the strength of the box is low and it is difficult to ensure vibration resistance. Moreover, since two parts were required for the housing, there was a problem that it was not efficient in terms of assemblability and economy.

  The present invention has been made to solve the above-described problems, and provides an in-vehicle electronic device capable of reducing weight and ensuring in-vehicle performance such as vibration proof performance, electromagnetic shielding performance, and dustproof performance. Objective.

  The vehicle-mounted electronic device according to the present invention includes a media drive, a circuit board electrically connected to the media drive, a media drive fixed on one surface, and a circuit board fixed on the other surface. Covers the plate-shaped metal holder with an area equal to or larger than the surface area, the cylindrical resin housing with the insertion slot into which the metal drive and circuit holder are inserted, and the resin housing insertion slot. In this state, it is fixed to the media drive through the first metal bracket for fixing the media drive to the vehicle and the through hole formed in the resin casing, and the media drive to the vehicle. And a second metal bracket to be fixed.

  According to the present invention, the weight can be reduced by using the resin casing, and the inner casing is protected from dust, water, and attachment handling to the vehicle by securing the strength as a casing by making it cylindrical. it can. In addition, by using a metal holder that has an area larger than the area of the fixed surface of the media drive, the substrate ground can be strengthened to reduce electromagnetic noise generated from the circuit board, and wiring that connects the media drive and the circuit board In addition, electromagnetic noise generated from media drives can be shielded. In addition, since the metal bracket holds the heavy media drive, the load on the resin housing can be reduced and vibration resistance can be secured, and the media drive can be connected to the vehicle ground via the metal bracket. This improves the electromagnetic shielding performance. Therefore, it is possible to provide an in-vehicle electronic device with reduced weight while ensuring in-vehicle performance such as vibration proof performance, electromagnetic shielding performance, and dustproof performance.

It is a disassembled perspective view which shows the structure of the vehicle-mounted electronic device which concerns on Embodiment 1 of this invention. 1 is an external perspective view showing a configuration of an in-vehicle electronic device according to Embodiment 1. FIG. 3 is an exploded perspective view showing a configuration of a media drive circuit board assembly of the in-vehicle electronic device according to Embodiment 1. FIG. FIG. 4 is an enlarged view of a part of a media drive circuit board assembly of the in-vehicle electronic device according to the first embodiment. It is sectional drawing which cut | disconnected the vehicle-mounted electronic device which concerns on Embodiment 1 along the AA line of FIG. It is sectional drawing which cut | disconnected the vehicle-mounted electronic device which concerns on Embodiment 2 of this invention in the position corresponded to the AA line of FIG.

Embodiment 1 FIG.
As shown in the exploded perspective view of FIG. 1 and the external perspective view of FIG. 2, the in-vehicle electronic device 1 according to the first embodiment is a media drive circuit in which a media drive 10 and a circuit board 20 are fixed to a metal holder 30. A resin casing 40 in which the board assembly 2 is housed, and metal brackets 50 and 60 for fixing the media drive 10 to the vehicle are provided. The in-vehicle electronic device 1 is attached to a fixing portion (not shown) provided in the vehicle using a metal bracket 50 (first metal bracket) and a metal bracket 60 (second metal bracket).

FIG. 3 shows an exploded perspective view of the media drive circuit board assembly 2.
The media drive 10 is a heavy object having a mechanical structure. For example, when the in-vehicle electronic device 1 is applied to a disk device, a disk drive that reproduces a disk such as a CD (Compact Disc) corresponds to the media drive 10. Further, for example, when the in-vehicle electronic device 1 is applied to an audio device, a storage device such as an HDD (Hard Disk Drive) or an SSD (Solid State Drive) corresponds to the media drive 10.

In the first embodiment, a disk drive is illustrated as an example of the media drive 10. A disc insertion slot 11 into which a disc is inserted is opened on the front surface of the sheet metal housing of the media drive 10. A disk insertion opening 51 is also opened in the metal bracket 50 that covers the front surface of the media drive 10.
A flexible printed circuit board (hereinafter referred to as FPC) 12 extends from the inside of the sheet metal housing of the media drive 10 to the outside. Screw holes 13 a and 13 b for screwing the metal bracket 50 are provided on the front surface of the media drive 10. Screw holes 14 a and 14 b for screwing the metal bracket 60 are provided on the back surface of the media drive 10. Screw holes 15 a to 15 d that are screwed to the metal holder 30 are provided on the bottom surface of the media drive 10 (that is, a fixed surface that is fixed to the metal holder 30).

  On the circuit board 20, electronic components and the like for controlling the media drive 10 are mounted. FIG. 3 shows a state in which the connector 21 that connects the FPC 12 of the media drive 10 is mounted on the back surface. The circuit board 20 is provided with screw holes 22 a to 22 d for screwing to the metal holder 30.

  The metal holder 30 is a sheet metal member having an area equal to or larger than the bottom area of the media drive 10. The metal holder 30 has an FPC insertion hole 31 through which the FPC 12 passes. Further, the metal holder 30 is provided with screw holes 32 a to 32 d for screwing the media drive 10 and screw holes 33 a to 33 d for screwing the circuit board 20.

The media drive 10 and the circuit board 20 are directly fixed to the metal holder 30. In FIG. 3, the screw holes 22 a to 22 d and the screw holes 33 a to 33 d are fastened with screws, and the circuit board 20 is fixed to the back surface of the metal holder 30. Further, the screw holes 15 a to 15 d and the screw holes 32 a to 32 d are fastened with screws, and the media drive 10 is fixed to the surface of the metal holder 30. The media drive 10 and the circuit board 20 are fixed to the metal holder 30 to form the media drive circuit board assembly 2.
Note that either the screw holes 22a to 22d or the screw holes 33a to 33d may be fool holes (holes having a diameter larger than the screw diameter). Similarly, any of the screw holes 15a to 15d and the screw holes 32a to 32d may be a fool hole. For screw holes other than these, either the own side or the other side may be a fool hole.

  In FIG. 3, the media drive 10 is fixed to the upper surface side of the metal holder 30 and the circuit board 20 is fixed to the lower surface side. Conversely, the circuit board 20 is fixed to the upper surface side of the metal holder 30 and the lower surface side. The media drive 10 may be fixed to the head. When the media drive 10 is fixed to the lower surface side of the metal holder 30, the metal holder 30 has an area equal to or larger than the area of the upper surface (fixed surface) of the media drive 10.

  Here, as shown in the enlarged view of FIG. 4, the protrusion 34 may be formed by protruding the peripheral portion of the screw hole 33 a of the metal holder 30 toward the circuit board 20. This is because when the mounting component 23 exists on the surface of the circuit board 20, the circuit board 20 and the metal holder 30 are screwed to avoid the mounting component 23. Although not shown in FIG. 4, protrusions 34 are also formed in the screw holes 33 b to 33 d of the metal holder 30.

The resin casing 40 is an exterior for protecting the media drive 10 and the circuit board 20 from dust, water, and handling attachment to a vehicle. The resin casing 40 is substantially cylindrical, and an insertion port 41 for inserting the media drive circuit board assembly 2 is provided on the front surface. The insertion port 41 may be provided on the upper surface instead of the front surface. Screw holes 42 a and 42 b for screwing the metal bracket 50 are provided on both side surfaces of the resin casing 40. On the back surface of the resin casing 40, through holes 43 a and 43 b that allow the protrusions 61 a and 61 b of the metal bracket 60 to pass therethrough are provided. Since the resin casing 40 is made of resin, the weight can be reduced compared to the metal casing. Moreover, since it is a substantially cylindrical shape, the strength as a housing can be ensured, and it does not require assembling work as compared with the case where it is divided into two parts of a lid and a box as in the prior art.
In addition, as a resin member which comprises the resin housing | casing 40, a polycarbonate is used, for example. Further, a filler such as carbon fiber or glass fiber may be mixed into the resin member to increase the strength.

Each of the metal brackets 50 and 60 is an attachment member for screwing the heavy media drive 10 to a fixed portion of the vehicle. Since the metal brackets 50 and 60 directly hold the media drive 10, the load on the resin housing 40 is reduced.
The metal bracket 50 is provided with screw holes 52 a and 52 b that are screwed to the media drive 10. Further, projecting pieces 53 a and 53 b and screw holes 54 a and 54 b that are screwed to the resin casing 40 are provided on both side ends of the metal bracket 50. At the upper end of the metal bracket 50, a projecting piece 55 and screw holes 56a and 56b that are screwed to a fixed portion of the vehicle are provided.
In addition, the position, direction, shape, etc. which form the protrusions 53a and 53b of the metal bracket 50 are not limited to the illustrated example. For example, the projecting pieces 53 a and 53 b may be provided on the upper and lower ends instead of the both ends of the metal bracket 50. In that case, the screw holes 42a and 42b of the resin housing 40 corresponding to the screw holes 54a and 54b of the projecting pieces 53a and 53b are provided on the upper and lower surfaces instead of the both side surfaces of the resin housing 40.

  The protrusions 61 a and 61 b of the metal bracket 60 are provided with screw holes 62 a and 62 b that are screwed to the media drive 10. Further, at the upper end of the metal bracket 60, projecting pieces 63a and 63b and screw holes 64a and 64b that are screwed to a fixed portion of the vehicle are provided.

Next, an example of the assembly procedure of the in-vehicle electronic device 1 will be described.
First, the operator inserts the media drive circuit board assembly 2 into the resin casing 40 from the insertion port 41 and covers the insertion port 41 with the metal bracket 50. Subsequently, the operator fastens the screws to the screw holes 13 a and 13 b of the media drive 10 and the screw holes 52 a and 52 b of the metal bracket 50 to fix the metal bracket 50 to the media drive 10. Further, the operator fastens the screws to the screw holes 54a, 54b of the projecting pieces 53a, 53b and the screw holes 42a, 42b of the resin casing 40 accommodated inside the resin casing 40, and attaches the metal bracket 50 to the resin. Secure to the housing 40. Subsequently, the operator penetrates the protrusions 61 a and 61 b of the metal bracket 60 into the through holes 43 a and 43 b of the resin housing 40, and the screw holes 62 a and 62 b of the protrusions 61 a and 61 b and the screw holes 14 a of the media drive 10. , 14b to fix the metal bracket 60 to the media drive 10.
In addition, although illustration is abbreviate | omitted, you may attach a design panel, a display, etc. to the front surface etc. of the metal bracket 50. FIG.

FIG. 5 is a cross-sectional view of the in-vehicle electronic device 1 taken along line AA in FIG.
When the completed in-vehicle electronic device 1 is fixed to the fixing portions 101, 102 of the vehicle, the operator can use the screw holes 56a, 56b, 64a, 64b formed in the projecting pieces 55, 63a, 63b of the metal brackets 50, 60 and The vehicle-mounted electronic device 1 is fixed to the vehicle by fastening screws into screw holes formed in the vehicle fixing portions 101 and 102.
In addition, the position, direction, shape, etc. which form the protrusions 55, 63a, 63b of the metal brackets 50, 60 can be deformed according to the shape of the fixed portions 101, 102 of the vehicle, and are limited to the illustrated examples. is not.

  As described above, according to the first embodiment, the in-vehicle electronic device 1 fixes the media drive 10, the circuit board 20 electrically connected to the media drive 10 by the FPC 12, and the media drive 10 on one surface. A plate-shaped metal holder 30 having an area equal to or larger than the area of the fixed surface of the media drive 10 for fixing the circuit board 20 on one surface, and a cylindrical shape having an insertion opening 41 into which the media drive circuit board assembly 2 is inserted. A resin casing 40, a metal bracket 50 that fixes the media drive 10 to the vehicle while being covered with the insertion port 41 of the resin casing 40, and a penetration formed in the resin casing 40 A metal bracket 60 that is fixed to the media drive 10 through the holes 43a and 43b and that fixes the media drive 10 to the vehicle. It was configured to include the. By using the resin casing 40, the weight can be reduced, and by making it cylindrical, the strength of the casing can be secured, and the media drive circuit board assembly 2 can be protected from dust, water, and attachment handling to the vehicle. Further, by using the metal holder 30 having an area equal to or larger than the area of the fixed surface of the media drive 10, it is possible to reinforce the substrate ground and reduce electromagnetic noise generated from the circuit board 20, and from the FPC 12 and the media drive 10. The generated electromagnetic noise can be shielded. In addition, since the metal brackets 50 and 60 hold the heavy media drive 10, it is possible to reduce the load on the resin casing 40 and to ensure vibration resistance. Furthermore, the electromagnetic shield performance is improved by connecting the sheet metal housing of the media drive 10 to the vehicle ground via the metal brackets 50 and 60. Accordingly, it is possible to provide the in-vehicle electronic device 1 capable of reducing the weight and ensuring the in-vehicle performance such as the vibration proof performance, the electromagnetic shielding performance, and the dustproof performance.

Embodiment 2. FIG.
6 is a cross-sectional view of the in-vehicle electronic device 1 according to Embodiment 2 cut at a position corresponding to the line AA in FIG. In FIG. 6, the same or corresponding parts as those in FIGS.
In the second embodiment, the heat generating component 24 is back-mounted on the circuit board 20. A heat receiving portion 65 that receives heat generated by the heat generating component 24 is formed in a part of the metal bracket 60-1, and heat generated by the heat generating component 24 is radiated to the outside through the metal bracket 60-1. In the configuration example of FIG. 6, the lower end portion of the metal bracket 60-1 extends so as to cover the heat generating component 24 and functions as the heat receiving portion 65. A heat transfer member 70 is installed between the heat generating component 24 and the heat receiving portion 65. Further, a part of the bottom surface of the resin casing 40-1 is cut out to form a cutout portion 44, and the heat receiving portion 65 of the metal bracket 60-1 is fitted.
In addition, the shape of the metal bracket 60-1 may be deformed according to the mounting position of the heat generating component 24, and is not limited to the configuration example of FIG.

  As described above, according to the second embodiment, the metal bracket 60-1 is configured such that the heat receiving portion 65 that receives the heat generated by the heat generating component 24 of the circuit board 20 is formed to radiate the heat to the outside. For this reason, the metal bracket 60-1 can be utilized as a heat sink.

  In the example of FIG. 6, the heat receiving portion 65 is formed on the metal bracket 60-1 and used as a heat sink, but the heat receiving portion may be formed on the metal bracket 50 and used as a heat sink.

  In the said Embodiment 1, 2, although the example using FPC12 was shown, you may be a flexible flat cable (FFC). Further, not the FPC insertion hole 31 through which the FPC 12 (or FFC) passes, but a notch may be used.

  In addition to the above, within the scope of the present invention, the present invention can freely combine each embodiment, modify any component of each embodiment, or omit any component of each embodiment. It is.

  DESCRIPTION OF SYMBOLS 1 In-vehicle electronic device, 2 Media drive circuit board assembly, 10 Media drive, 11 Disk insertion slot, 12 FPC, 13a, 13b, 14a, 14b, 15a-15d, 22a-22d, 32a-32d, 33a-33d, 42a, 42b, 52a, 52b, 54a, 54b, 56a, 56b, 62a, 62b, 64a, 64b Screw hole, 20 Circuit board, 21 Connector, 23 Mounting component, 24 Heat generating component, 30 Metal holder, 31 FPC insertion hole, 34 Part, 40, 40-1 resin housing, 41 insertion slot, 43a, 43b through hole, 44 notch, 50, 60, 60-1 metal bracket, 51 disk insertion slot, 53a, 53b, 55, 63a, 63b Piece, 61a, 61b Projection, 65 Heat receiving part, 70 Heat transfer member, 101, 102 Tough.

Claims (2)

A media drive,
A circuit board electrically connected to the media drive;
A plate-like metal holder having an area equal to or larger than the area of the fixing surface of the media drive, fixing the media drive to one surface and fixing the circuit board to the other surface;
A cylindrical resin casing in which an insertion port into which the metal holder to which the media drive and the circuit board are fixed is inserted is opened;
A first metal bracket that is fixed to the media drive in a state of covering the insertion port of the resin casing, and that fixes the media drive to a vehicle;
An in-vehicle electronic device comprising: a second metal bracket that is fixed to the media drive through a through hole formed in the resin casing and that fixes the media drive to the vehicle.   2. The vehicle-mounted vehicle according to claim 1, wherein the first metal bracket or the second metal bracket is provided with a heat receiving portion that receives heat generated by a heat-generating component of the circuit board and dissipates the heat to the outside. Electronics.

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