JP6192422B2 - Car electronics - Google Patents

Description

  The present invention relates to an in-vehicle electronic device such as a media drive device and an audio device mounted on a vehicle.

  In-vehicle electronic devices have a metal casing on the exterior to protect the electronic components from dust, water, and attachment to the vehicle while ensuring the strength against vibration and electromagnetic shielding performance of the vehicle. In many cases, the weight was increased.

  In recent years, weight reduction of in-vehicle electronic devices has been demanded due to demands for improving fuel consumption of vehicles. Thus, for example, in Patent Documents 1 to 3, the casing is made of a resin member to reduce the weight.

Japanese Utility Model Publication No. 3-66088 JP 2008-174124 A JP 2008-174129 A

  However, in Patent Document 1, the metal holder that holds the circuit board is fixed in the resin casing, and the metal holder is screwed to the vehicle with the resin casing interposed therebetween. There is a problem that the strength against the vibration load generated by the is weak.

  In contrast, the resin casings of Patent Documents 2 and 3 have a rectangular cutout, and a metal holder fixed in the resin casing is exposed to the cutout portion and screwed directly to the vehicle side. The strength against vibration load can be increased. On the other hand, it is difficult to ensure the strength of the housing by dividing the resin housing into a housing body and a housing top plate and forming notches at the edges of the housing body. There was a problem. Moreover, since two parts are required for the housing, it is not efficient in terms of assemblability and economy.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vehicle-mounted electronic device that achieves weight reduction while satisfying vehicle-mounted performance such as vibration proof performance and electromagnetic shielding performance.

An in-vehicle electronic device according to the present invention includes a device, a circuit board electrically connected to the device, a metal bracket that holds the device and the circuit board, and is attached to a metal fixing portion provided in the vehicle. And a resin casing that houses the device, the circuit board, and the bracket, and a metal heat dissipating member that is fixed to the bracket. The casing is an attachment portion between the bracket and the vehicle fixing portion. has a hole in the bracket is exposed from the hole of the casing to the fixed part of the vehicle directly attached, et al is to the fixing portion has an opening at a position for accommodating the heat generating components of the circuit board, the opening Is closed by the heat dissipating member .

  According to the present invention, the weight can be reduced by using the resin casing, and the internal parts can be protected from dust, water, and mounting on the vehicle. Further, by drilling a hole in the housing and directly attaching the bracket to the fixed portion of the vehicle, vibration of the device and the circuit board can be suppressed while securing the strength as the housing, and the vibration resistance performance is improved. Furthermore, the electromagnetic shielding performance is improved by electrically connecting the device and the circuit board to the fixed portion of the vehicle via the bracket. Therefore, it is possible to provide an in-vehicle electronic device that achieves weight reduction while satisfying in-vehicle performance such as vibration resistance and electromagnetic shielding performance.

It is a perspective view which shows the basic structure of the vehicle-mounted electronic device which concerns on Embodiment 1 of this invention. It is a perspective view which shows the state which assembled the vehicle-mounted electronic device of FIG. It is an enlarged view which shows the cross-section in the frame line A of FIG. FIG. 3 is a perspective view showing a specific example of the in-vehicle electronic device according to the first embodiment. It is a figure explaining the assembly procedure of the vehicle-mounted electronic device of FIG. FIG. 6 is a diagram for explaining an assembly procedure of the on-vehicle electronic device in FIG. 4 and shows a continuation of FIG. 5. FIG. 7 is a diagram for explaining an assembly procedure of the on-vehicle electronic device of FIG. 4 and shows a continuation of FIG. 6. FIG. 8 is a diagram for explaining an assembly procedure of the on-vehicle electronic device of FIG. 4 and shows a continuation of FIG. 7. It is the perspective view which looked at the vehicle-mounted electronic device of FIG. 4 from the rear side. It is the figure which expanded the attachment part of the metal bracket exposed from the hole of the resin housing | casing among the vehicle-mounted electronic devices of FIG.

Embodiment 1 FIG.
As shown in FIGS. 1 and 2, the in-vehicle electronic device 1 according to the first embodiment holds a device 10 having a mechanical structure, a circuit board 20 that controls the device 10, and the device 10 and the circuit board 20. Metal brackets 30 and 40 and a resin casing 50 as an exterior are provided. For example, when the in-vehicle electronic device 1 is applied to an audio device, the disk reproducing device corresponds to the device 10.
The in-vehicle electronic device 1 is attached to a metal fixing part (not shown) provided in the vehicle.

  The device 10 and the circuit board 20 are directly fixed to the metal brackets 30 and 40. In the illustrated example, the device 10 which is a heavy component is sandwiched between metal brackets 30 and 40, and two places from each of the metal brackets 30 and 40 are fixed by screws 101 to 104. As shown in the enlarged view of FIG. 3, the circuit board 20 is fixed with screws 105 at about two places from the bent lower end of the metal bracket 30. The metal bracket 40 side is similarly screwed to the circuit board 20.

  The resin casing 50 is an exterior for protecting the device 10 and the circuit board 20 from dust, water, and handling attachment to a vehicle. A front opening 51 into which the device 10 or the like is inserted is provided on the front side of the resin casing 50. Further, holes 52 and 53 for exposing the attachment portions 31 and 41 of the metal brackets 30 and 40 are formed on both sides of the resin casing 50.

  In FIG. 1, the device 10 and the circuit board 20 integrated with the metal brackets 30 and 40 are slotted in from the front opening 51 opened to the front side of the resin casing 50, and are accommodated in the resin casing 50. It will be in the state of FIG. At this time, the mounting portions 31 and 41 of the metal brackets 30 and 40 are exposed to the outside through the holes 52 and 53 opened on both side surfaces of the resin casing 50. Screw holes 32, 33, 42, and 43 are provided in the attachment portions 31 and 41, and the attachment portions 31 and 41 and the metal fixing portion of the vehicle are directly tightened using screws (not shown).

In the case of Patent Document 1 described in advance, since the resin casing is fastened together with the metal bracket sandwiched between the metal bracket and the vehicle's metal fixing portion, there is a concern about the occurrence of looseness due to the sag of the resin casing. There was a risk that the strength against vibration during running could not be secured sufficiently.
On the other hand, in the structure of FIGS. 1-3, since the attachment parts 31 and 41 of the metal brackets 30 and 40 are directly fastened to the metal fixing part of a vehicle, vibration proof performance improves. Therefore, it is possible to suppress the shake of the device 10 which is a heavy component with respect to the vibration load generated by the vehicle traveling.

In the case of Patent Documents 2 and 3 described in advance, the edge of the resin casing is notched to expose the mounting portion of the metal bracket to the metal fixing portion side of the vehicle, so it is difficult to ensure the strength as the casing. It was.
In contrast, in the configuration of FIGS. 1 to 3, the edge of the resin casing 50 is not cut out, and the holes 52 and 53 are formed, so that the strength as the casing can be secured. In addition, since the resin casing 50 serving as the exterior is one component, it is efficient in terms of assembly and economy.

  1 to 3, the device 10 and the circuit board 20 electrically connected to the device 10 are electrically connected to the metal brackets 30 and 40. , 40 are electrically connected to a metal fixing part (vehicle ground) of the vehicle. Therefore, the emission of electromagnetic noise generated from the circuit board 20 can be suppressed.

  Further, in the configuration of FIGS. 1 to 3, the device 10 and the circuit board 20 are housed in the resin casing 50 to protect from dust, water, and handling attachment to the vehicle. The holes 52 and 53 opened on both side surfaces of the resin casing 50 are closed by the attachment portions 31 and 41 of the metal brackets 30 and 40, and the front opening 51 is also closed by a design panel or the like.

  Thus, even if the resin casing 50 is used instead of the conventional general metal casing, the vibration resistance performance, the electromagnetic shielding performance, and the protection performance can be ensured. The on-vehicle electronic device 1 with reduced weight can be realized.

  In addition, in the example of FIGS. 1-3, although each member of the vehicle-mounted electronic device 1 was fastened with the screw | thread, you may fix by other methods, such as fitting of a nail | claw.

Next, a specific example of the in-vehicle electronic device 1 will be described with reference to FIGS.
As shown in the perspective view of FIG. 4, in this example, a design panel 90 provided with a button for operating the device 10 and a display is installed on the front side of the in-vehicle electronic device 1, and the strength against the pushing load of the button is increased. A metal holder 60 (shown in FIG. 5) is used to ensure. Then, since the weight of the metal holder 60 increases, it is necessary for the metal brackets 30 and 40 to hold the heavy objects of the design panel 90, the metal holder 60, and the device 10, and the structure may be complicated. Therefore, in this example, the metal brackets 30 and 40 and the metal holder 60 are fixed, and the device 10 and the design panel 90 are fixed to the metal holder 60, thereby simplifying the structure and assembling work.

  In this example, a metal heat dissipating member 80 (for example, an aluminum heat sink) is installed for heat dissipation of the high heat generating component 21 (shown in FIG. 9) mounted on the circuit board 20, and this heat dissipating member is provided. A metal holder 70 (shown in FIG. 5) is used to hold 80.

The assembly procedure of the in-vehicle electronic device 1 is the order shown in FIGS. The arrows in the figure indicate the assembly direction of the parts.
5A, the metal holder 60 is fixed to the front side of the device 10 using screws 106 and 107, and the metal holder 70 is fixed to the rear side of the device 10 using screws 108 and 109. Further, as shown in FIG. 5A and an enlarged view of FIG. 5B, the claw portions 71 and 72 projecting from the end of the metal holder 70 are formed in the through holes 22 and 23 of the circuit board 20. By inserting and twisting the metal holder 70 and the circuit board, the claw portions 71 and 72 are hooked on the peripheral portions of the through holes 22 and 23 as shown in FIG. 5C and FIG. 20 is fixed.

  In FIG. 6, the metal brackets 30 and 40 are fixed to the metal holder 60 using screws 110 and 111. Further, in FIG. 8 described later, the metal holder 70, the metal brackets 30 and 40, and the heat radiating member 80 are fixed by screws 112 and 113.

In FIG. 7, the device 10 or the like is slotted in from the front opening 51 of the resin housing 50. In the resin casing 50, in addition to the front opening 51 and the holes 52 and 53 (the hole 53 is hidden and cannot be seen), a rear opening 54 is provided on the rear side.
The resin casing 50 is screwed from the outside to the metal brackets 30 and 40 as necessary, or a claw portion is formed in the front opening 51 and fitted to the front metal holder 60.

In FIG. 8, the heat radiating member 80 is installed so as to close the rear opening 54 of the resin housing 50, and the heat radiating member 80, the metal bracket 30, and the metal holder 70 are fastened together using screws 112, and the screws 113 are attached. The heat radiating member 80, the metal bracket 40, and the metal holder 70 are fastened together. Thereby, the heat radiating member 80 on the rear side of the resin casing 50 and the pair of left and right metal brackets 30 and 40 are electrically connected, and the electromagnetic shielding performance is improved.
Finally, as shown in FIG. 4, the design panel 90 is attached to the front metal holder 60 to complete the in-vehicle electronic device 1.

  Here, the perspective view which looked at the vehicle-mounted electronic device 1 from the rear side in FIG. 9 is shown. By disposing the heat radiating member 80 outside the resin casing 50, efficient heat dissipation is possible. Further, on the rear side of the resin casing 50, the high heat generating component 21 mounted on the circuit board 20 and the heat radiating member 80 are fixed with screws 114 and 115, and the high heat generating component 21 is brought into contact with the heat radiating member 80 to improve heat dissipation performance. Secured.

In the in-vehicle electronic device 1 of FIG. 9, the attachment portion 31 of the metal bracket 30 exposed from the hole 52 of the resin casing 50 is enlarged and shown in FIG. 10. The in-vehicle electronic device 1 is attached to the vehicle by bringing the attachment portion 31 exposed in the hole 52 into contact with the metal fixing portion of the vehicle and directly tightening.
In this example, since the attachment portion 31 is protruded from the metal bracket 30 and is brought into contact with the metal fixing portion of the vehicle, the attachment portion 31 is not caught when the metal bracket 30 is slotted into the resin casing 50. The relief portion 55 is provided at the edge of the hole 52. By providing the relief portion 55 without cutting out the edge portion of the hole 52, the strength of the resin casing 50 is ensured without impairing the assembling property of the metal bracket 30.

  As described above, according to the first embodiment, the in-vehicle electronic device 1 holds the device 10, the circuit board 20 electrically connected to the device 10, the device 10 and the circuit board 20, and is provided in the vehicle. The metal brackets 30 and 40 attached to the metal fixing part, and the resin casing 50 that houses the device 10, the circuit board 20, and the metal brackets 30 and 40, and the resin casing 50 includes the metal brackets 30 and 40 and the vehicle. There are holes 52, 53 in the mounting portion with the metal fixing portion of the metal bracket, and the metal brackets 30, 40 are exposed to the metal fixing portion of the vehicle through the holes 52, 53 of the resin casing 50 and are directly attached to the metal fixing portion It was made a configuration. The vehicle-mounted electronic device 1 can be reduced in weight by using a lightweight resin casing 50 instead of a conventional heavy metal casing. Further, by making holes 52 and 53 in the resin housing 50 and directly attaching the mounting portions 31 and 41 of the metal brackets 30 and 40 to the metal fixing portion of the vehicle, the device 10 and the circuit are secured while ensuring the strength as the housing. The vibration of the substrate 20 can be suppressed, and the vibration resistance performance is improved. In addition, since the device 10 and the circuit board 20 are electrically connected to the metal fixing portion of the vehicle via the metal brackets 30 and 40, the electromagnetic shielding performance is improved. Furthermore, by covering the device 10 and the circuit board 20 with the resin casing 50, it is possible to protect from dust, water, and vehicle mounting handling. Therefore, it is possible to provide the in-vehicle electronic device 1 that achieves weight reduction while satisfying the in-vehicle performance such as the vibration resistance performance and the electromagnetic shielding performance.

  Moreover, according to Embodiment 1, the vehicle-mounted electronic device 1 is configured to include the metal holder 60 that fixes the device 10 to the metal brackets 30 and 40. For this reason, even when the metal holder 60 holding the design panel 90 which is a heavy object is added, the device 10 and the metal brackets 30 and 40 can be fixed via the metal holder 60, and the structure and the assembly work are simplified. Is possible.

  Further, according to the first embodiment, the in-vehicle electronic device 1 includes the metal heat radiating member 80 fixed to the metal brackets 30 and 40, and the resin casing 50 accommodates the high heat generating component 21 of the circuit board 20. The rear surface opening 54 is provided at a position where the rear surface opening 54 is closed by the heat radiating member 80. For this reason, the heat dissipation of the high heat-generating component 21 is improved. Moreover, by electrically connecting the heat radiating member 80 and the metal brackets 30 and 40, the rear side of the in-vehicle electronic device 1 is covered with the metal member, and the electromagnetic shielding performance is further improved. In addition, the weight of the heat radiating member 80 is held by the metal brackets 30 and 40, and the vibration resistance is improved.

  In the present invention, any constituent element of the embodiment can be modified or any constituent element of the embodiment can be omitted within the scope of the invention.

  DESCRIPTION OF SYMBOLS 1 In-vehicle electronic device, 10 device, 20 Circuit board, 21 High heat generation component, 22, 23 Through hole 30, 40 Metal bracket, 31, 41 Attaching part, 32, 33, 42, 43 Screw hole, 50 Resin housing, 51 Front opening, 52, 53 holes, 54 Rear opening, 55 Escape, 60, 70 Metal holder, 71, 72 Claw, 80 Heat dissipation member, 90 Design panel, 101-115 screw.

Claims (2)

The device,
A circuit board electrically connected to the device;
A metal bracket that holds the device and the circuit board and is attached to a metal fixing portion provided in a vehicle,
A resin housing that houses the device, the circuit board, and the bracket ;
A metal heat dissipating member fixed to the bracket ;
The housing has a hole in a mounting portion between the bracket and the fixed portion of the vehicle,
Said bracket, said exposed from the hole of the casing to the fixed part of the vehicle directly attached, et al is to the fixed portion,
An in-vehicle electronic device having an opening at a position where the heat generating component of the circuit board is accommodated, and the opening is closed by the heat radiating member .   The vehicle-mounted electronic device according to claim 1, further comprising a metal holder that fixes the device to the bracket.

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