JP2007004893A - On-vehicle electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable on-vehicle electronic equipment by giving flexibility in arrangements (layout) of a main circuit board in a casing and a circuit board for drive mechanism, and also attaining reduction of a wiring distance between each circuit board. <P>SOLUTION: In the on-vehicle electronic equipment, the main circuit board 2 and the circuit board 3 for drive mechanism which are housed inside the casing 1, are constituted so as to be connected with connector to a circuit board 51 for display device which is provided with relay function, and the main circuit board 2 and the circuit board 3 for drive mechanism are electrically connected through the circuit board 51 for display device provided with relay function. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an in-vehicle electronic device such as a CD player or a DVD player, or an in-vehicle electronic device such as a navigation device configured integrally with an audio device, and is particularly housed in a casing of the in-vehicle electronic device. The present invention relates to a technique for electrically connecting a main circuit board and a circuit board for a driving mechanism.

  Conventionally, this type of in-vehicle electronic device generally includes a box-shaped casing made of a metal plate, a drive mechanism for recording / reproducing information on an information recording medium such as a cassette tape, CD, DVD, and the like. A circuit board on which driving electronic components for the driving mechanism are mounted, a main circuit board on which electronic components constituting an operation control circuit and a power supply circuit having a central processing unit (CPU) are mounted, a display device and a plurality of operation keys In addition to attaching the drive mechanism and each circuit board to the inside of the housing, all components such as the display device and the front panel are integrated into the housing to assemble the in-vehicle electronic device.

  In this type of in-vehicle electronic device, generally, an operation control circuit, a power supply circuit, and the like are provided on the main circuit board. Therefore, a flexible cable or the like is used between the main circuit board and the drive mechanism circuit board. It was necessary to make an electrical connection using a flat cable or the like.

  By the way, the electrical connection method between the two circuit boards using such a flexible cable has a problem that causes malfunction or sound quality degradation due to generation of noise from the cable portion or absorption of external noise. In addition, flexible cables, etc. have the characteristic that they have a high degree of freedom in vibration, so they are shaken by vibrations while the automobile is running and come into contact with electronic components mounted on the main circuit board or the circuit board for the drive mechanism. May cause a failure.

  Further, when a flexible cable or the like is used, it is necessary to attach a connection component to the end of each cable. In this way, the electrical connection method using the connection parts for the cable ends requires parts cost and cable assembly man-hours, and each cable is connected after each circuit board is installed inside the housing. Therefore, there is a problem that the assembly process becomes complicated and the number of disassembled parts increases at the time of recycling.

  As one means for solving the problems in the above-described in-vehicle electronic device, a partition plate attached so as to divide the inside of the box-shaped housing into two parts is provided, and a pair of both sides of the partition plate is provided on the front and back sides. A vehicle-mounted electronic device configured to fix the circuit board and connect the two circuit boards to each other by a connector has been proposed (for example, see Patent Document 1).

JP 2002-314261 A

  In such an in-vehicle electronic device, since it is necessary to accommodate a large number of functional units in a small space, a structural design that determines the arrangement and the like of each functional unit is an extremely important point. However, in the above-described in-vehicle electronic device, a pair of circuit boards are fixed to both front and back surfaces of the partition plate that bisects the inside of the casing, and the two circuit boards are directly connected by connectors. There are many design limitations. For this reason, the arrangement of the connection connectors between the two circuit boards in the inside of the housing is limited, which has been a structural design bottleneck that determines the arrangement and the like of each functional unit.

  The present invention is intended to solve the problems of such a conventional configuration, and an object of the present invention is to arrange (layout) the main circuit board and the drive mechanism circuit board in the housing. An object of the present invention is to provide a highly reliable in-vehicle electronic device that can have a degree of freedom and that can shorten the wiring distance between circuit boards.

  Furthermore, the present invention provides an in-vehicle electronic device capable of reducing the manufacturing cost by simplifying the assembly process of the main circuit board and the drive mechanism circuit board and improving the recyclability by reducing the number of disassembled parts. It is intended to provide.

  In order to achieve the above object, the present invention provides a connector for another circuit board having a relay function between the main circuit board housed in the housing and the circuit board for driving mechanism in the in-vehicle electronic device. The main circuit board and the driving mechanism circuit board are electrically connected via another circuit board having a relay function.

  Further, the second problem solving means is to connect the main circuit board accommodated in the housing and the plurality of sets of drive mechanism circuit boards to other circuit boards having a relay function in the in-vehicle electronic device, respectively. The main circuit board and the plurality of sets of drive mechanism circuit boards are electrically connected to each other via another circuit board having a relay function.

  Further, it is preferable to use a circuit board for display device as the other circuit board having the relay function, which is more effective.

  Furthermore, an operation unit circuit board may be used as another circuit board having the relay function.

  The in-vehicle electronic device according to the present invention can give a degree of freedom to the arrangement (layout) of the main circuit board and the drive mechanism circuit board in the casing, and thus imposes unnecessary restrictions on the structural design in the casing. Therefore, free structural design is possible. In addition, since the wiring distance between the circuit boards can be shortened, noise can be generated or the external noise absorption range can be reduced, and reliability can be improved.

  Furthermore, according to the in-vehicle electronic device of the present invention, the assembly process of the main circuit board and the circuit board for the drive mechanism can be simplified, the manufacturing cost can be reduced, and the recyclability can be reduced by reducing the number of disassembled parts. Improvements can be made.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
FIG. 1 shows a first embodiment of the present invention, and is a cross-sectional view showing a schematic configuration of an in-vehicle electronic device viewed from the side. FIG. 2 is an exploded perspective view showing a specific configuration example of the first embodiment shown in FIG. FIG. 3 shows a second embodiment, and is a cross-sectional view showing a schematic configuration of an in-vehicle electronic device viewed from the side.

First, a first embodiment showing a schematic configuration of an in-vehicle electronic device according to the present invention will be described with reference to FIG.
The on-vehicle electronic device of the first embodiment shown in FIG. 1 includes, for example, a box-shaped housing 1 having a size of 1 DIN size, and a main circuit board 2 fixed on the upper side inside the housing 1. A driving mechanism circuit board 3 fixed in parallel at a predetermined interval below the main circuit board 2; a driving mechanism 4 such as a DVD player mounted on the upper surface of the driving mechanism circuit board 3; A display device 5 such as a liquid crystal display and a front panel 6 attached to one side surface of the body 1 are provided.

  The housing 1 includes a chassis base 11 having a part of the side surface and an upper surface opened, a front panel 6 covering the front side of the chassis base 11, a back panel 7 covering the back side, and a cover 12 covering the upper opening. It consists of

  Electronic components constituting an operation circuit having a central processing unit (CPU), a power supply circuit, and the like are mounted on the main circuit board 2 fixed to the inside upper side of the housing 1 by screws or the like. Further, a drive mechanism 4 such as a DVD player is fixed by screwing or the like on the upper surface of the circuit board 3 for driving mechanism fixed by screws or the like at a predetermined interval below the main circuit board 2. Has been.

  The front panel 6 is fixed to the housing 1 by screws or the like. A display device 5 such as a liquid crystal display and a plurality of operation keys 8 are arranged on the front panel 6.

  In the first embodiment, the display device circuit board 51 provided on the back side of the display device 5 is provided with a relay function so that the electrical connection between the main circuit board 2 and the drive mechanism circuit board 3 is achieved. Is configured to perform.

  Specifically, in order to give the display device circuit board 51 a relay function, a connector 2b for connecting a connector 2a attached to an edge of the main circuit board 2 and an edge of the drive mechanism circuit board 3 are provided. A connector 3b for connecting the attached connector 3a is provided.

Further, the two connectors 2b and the connector 3b provided on the display device circuit board 51 are attached to each other at a predetermined interval, and the display device circuit is provided between the two connectors 2b and the connector 3b. The wiring is connected to each other by pattern wiring (not shown) formed on the substrate 51.
In the first embodiment, the case where the drive mechanism circuit board 3 is disposed below the main circuit board 2 has been described. However, the present invention is not limited to this embodiment, and a free structural design is possible. Can be performed.

  Thus, by providing the display circuit board 51 with a relay function, the electrical connection between the circuit boards 2 and 3 can be achieved without worrying about the assembly dimensions of the main circuit board 2 and the drive mechanism circuit board 3. It is possible to perform a free structural design. In addition, since the wiring distance between the circuit boards 2 and 3 can be shortened, noise can be generated or the external noise absorption range can be reduced, and the reliability can be improved.

  Furthermore, according to the vehicle-mounted electronic device of the first embodiment, when a conventional flexible cable or the like is used, there is no connection component provided at the end of the cable. In addition, the assembly process of the circuit board 3 for driving mechanism can be simplified, the manufacturing cost can be reduced, and the recyclability can be improved by reducing the number of disassembled parts.

The first embodiment configured as described above can be put into practical use by configuring as shown in FIG. 2, for example.
In the in-vehicle electronic device shown in FIG. 2, a connector 2b and a connector 3b having a predetermined number of terminals are provided above and below a display device circuit board 51 at a predetermined interval. The connector 2b and the connector 3b are electrically connected to each other by a pattern wiring (not shown) formed on the display device circuit board 51.

After the connector 3a provided on the drive mechanism circuit board 3 is connected to the connector 3b configured as described above, the drive mechanism circuit board 3 is fixed to the housing 1 by screws or the like.
Further, after the connector 2a provided on the main circuit board 2 is connected to the connector 2b, the main circuit board 2 is fixed to the housing 1 by screwing or the like and assembled.

  With this configuration, the relay distance between the main circuit board 2 and the drive mechanism circuit board 3 can be shortened compared to the case where a conventional flexible cable or the like is used, and noise is generated. Alternatively, the range of absorption of external noise can be reduced. In addition, since it is possible to reduce the number of connecting parts provided at the end of a cable such as a flexible cable, it is possible to reduce the part cost and assembly man-hours, and to improve the recyclability by reducing the number of disassembled parts. be able to.

  Next, a second embodiment of the in-vehicle electronic device according to the present invention will be described with reference to FIG. The same components as those in the first embodiment described with reference to FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description is omitted.

  The second embodiment shown in FIG. 3 is a model in which a main circuit board 2 and, for example, two drive mechanisms 41 and 42 of a DVD and an MD are accommodated in the housing 1 at a predetermined interval in the vertical direction. A typical configuration is shown.

  In the second embodiment, the number of connector terminals of the connector 2a provided on the connector 2a of the main circuit board 2 and the display device circuit board 51 to which the connector 2a is connected is increased, respectively, for the first drive mechanism. The connector 31b that connects the connector 31a of the circuit board 31 and the connector 32b that connects the connector 32a of the second drive mechanism circuit board 32 are configured to be electrically connected to each other.

Further, the wiring between the connector 2b provided on the display circuit circuit board 51 and the connectors 31b and 32b is a pattern wiring formed on the circuit board 51 for the display device as in the case of the first embodiment. (Not shown) are connected by wiring.
In the second embodiment, the case where the circuit boards 31 and 32 for driving mechanism are arranged above and below the main circuit board 2 has been described. However, the present invention is not limited to this embodiment, and a free structural design is possible. Can be performed.

  As described above, when a plurality of driving mechanisms are accommodated in the housing, the configuration in which each circuit board is electrically connected by connector connection has many design restrictions, and thus there are various problems. It has been common to employ an electrical connection method using a conventional flexible cable or the like.

  On the other hand, the second embodiment of the present invention has a relay function between the main circuit board 2 accommodated in the housing 1 and a plurality of sets of drive mechanism circuit boards 31 and 32 as described above. The main circuit board 2 and a plurality of sets of drive mechanism circuit boards 31 and 32 are electrically connected via the display circuit board 51, respectively. By doing so, a free structural design using the connector connecting means became possible.

  Moreover, since the electrical wiring distance between the main circuit board 2 and the circuit boards 31 and 32 for both drive mechanisms can be shortened, noise can be generated or the external noise absorption range can be reduced. Improvements can be made.

  Furthermore, according to the in-vehicle electronic device of the second embodiment, when a conventional flexible cable or the like is used, there is no connection part to be attached to the end of the cable. The assembly process of the circuit boards 31 and 32 for drive mechanisms can be simplified, the manufacturing cost can be reduced, and the recyclability can be improved by reducing the number of disassembled parts.

  The present invention is not limited to the embodiment described above, and various modifications can be made within the scope of the gist of the present invention. For example, the in-vehicle electronic device described in the present embodiment is configured such that the display circuit board is provided with a relay function, and the main circuit board and the drive mechanism circuit board are electrically connected. For example, the operation unit circuit board may have a relay function, and the main circuit board and the drive mechanism circuit board may be electrically connected.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a first embodiment of the present invention, and is a cross-sectional view illustrating a schematic configuration of an in-vehicle electronic device viewed from a side surface side. It is the disassembled perspective view which showed the specific structural example of the 1st Example shown in FIG. FIG. 7 is a cross-sectional view illustrating a second embodiment of the present invention and illustrating a schematic configuration of an in-vehicle electronic device viewed from a side surface side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 11 Chassis base 12 Cover 2 Main circuit board 2a Connector 2b Connector 3 Drive mechanism circuit board 3a Connector 3b Connector 31 Drive mechanism circuit board 31a Connector 31b Connector 32 Drive mechanism circuit board 32a Connector 32b Connector 4 Drive mechanism 41 Drive mechanism 42 Drive mechanism 5 Display device 51 Circuit board for display device 6 Front panel 7 Rear panel 8 Operation keys

Claims (4)

In automotive electronics,
The main circuit board housed in the housing and the circuit board for the drive mechanism are configured to be connected to another circuit board having a relay function,
An in-vehicle electronic device characterized in that a main circuit board and a circuit board for driving mechanism are electrically connected via another circuit board having a relay function. In automotive electronics,
The main circuit board accommodated in the housing and a plurality of sets of drive mechanism circuit boards are configured to be connected by connectors to other circuit boards having a relay function,
An in-vehicle electronic device characterized in that a main circuit board and a plurality of sets of drive mechanism circuit boards are electrically connected to each other via another circuit board having a relay function.   3. The in-vehicle electronic device according to claim 1, wherein a display device circuit board is used as the other circuit board having the relay function.   3. The in-vehicle electronic device according to claim 1, wherein an operation unit circuit board is used as the other circuit board having the relay function.

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