JP2010045259A - Wiring board, in-vehicle acoustic player equipped with the same and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiring board, an in-vehicle acoustic player 11 equipped with the same and an electronic apparatus in which noise can be surely prevented from being outputted via an external output unit by easily providing an element for noise cancellation in the vicinity of the external output unit without making overcrowded wiring in the vicinity of the external output unit even if connecting a plurality of output wiring to the external output unit. <P>SOLUTION: A wiring board 10 includes a board body 12 and an auxiliary board 13. The board body 12 further includes an external output unit 16. In the external output unit 16, a plurality of output terminals 17 each for outputting an electrical signal from output wiring are provided while being aggregated. In the board body 12, an exposed area 18 is formed in the vicinity of the external output unit 16 and in the exposed area 18, the output wiring is exposed. The auxiliary board 13 is disposed in the exposed area 18 and includes an element 19 for noise cancellation. The element 19 for noise cancellation is installed while being electrically connected to the output wiring. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wiring board that outputs an electrical signal to the outside, an on-vehicle sound reproducing device including the same, and an electronic apparatus.

  FIG. 1 is a circuit diagram showing a wiring relationship in a wiring board 1 according to the prior art. In the wiring board 1 according to the related art, the first capacitor 2 is connected to an analog ground 3 and a digital ground 4. The first capacitor 2 is connected to the position of 2 mm to 10 mm from the external connection portion 5. A part of the second capacitor 6 is connected between the external connection unit 5 and the analog circuit 7. This prevents high-frequency noise from being transmitted to the external connection unit 5.

JP 2001-284828 A

  When the output terminal to the outside is provided at one place and a plurality of output wirings are connected like the external connection unit 5 in the prior art, a plurality of noises are removed between each output wiring and the ground layer. It is necessary to install these elements individually. Therefore, there is a problem that the work for installing the element for noise removal becomes complicated.

  The closer the position where an element for noise removal is provided to the output terminal to the outside, the higher the noise removal effect. However, when multiple output wirings are connected to the external output section where the output terminal to the outside is provided, the external output section can be configured by setting the position where the element for noise removal is set near the external output section. There is a problem that the wiring in the vicinity of is in an overcrowded state. Therefore, a distance of about 10 mm may be set between the element for noise removal and the output terminal. As described above, when the distance between the position where the element for noise removal is installed and the output terminal is long, there is a problem that the possibility that noise is mixed into the electric signal through this portion increases.

  In addition, when wiring for supplying power is provided in the external output unit, it is necessary to set each wiring to a sufficient thickness, and it is necessary to set a sufficient distance between the wirings. Therefore, in order to prevent the wiring in the vicinity of the external output section from becoming overcrowded, there is a problem that an element for removing noise in the output wiring cannot be arranged in the vicinity of the output terminal to the outside. .

  It is an object of the present invention to easily provide an element for removing noise in the vicinity of an external output unit without overpacking the wiring in the vicinity of the external output unit even when a plurality of output wirings are connected to the external output unit. Another object of the present invention is to provide a wiring board capable of reliably preventing noise from being output via an external output unit, an on-vehicle sound reproducing device and an electronic device including the wiring board.

  According to the present invention (1), the wiring board includes a board body and an auxiliary board. The substrate body is provided with a plurality of output wirings for outputting electrical signals to the outside, and has an external output unit. The external output unit is provided with a plurality of output terminals that output electrical signals from the output wiring. An exposed region is formed in the substrate body in the vicinity of the external output unit, and the output wiring is exposed in the exposed region. The auxiliary substrate is installed in the exposed region and has an element for removing noise. The element for noise removal is installed in an electrically connected portion exposed in the exposed region of the output wiring.

According to the invention (6), the on-vehicle sound reproducing device includes the wiring board.
According to the invention (9), the electronic apparatus includes the wiring board.

  According to the present invention (1), the exposed area is formed in the vicinity of the external output portion in the substrate body, and the output wiring is exposed in the exposed area. The auxiliary substrate is installed in the exposed region and has an element for removing noise. Thereby, an element for noise removal can be arranged in the vicinity of the external output unit. Therefore, noise included in the electrical signal output via the output wiring and the output terminal can be removed in the vicinity of the external output unit. By installing the auxiliary board in the exposed area, it is possible to place elements for noise removal, so that the elements for noise removal can be placed on the board body without overcrowding the wiring near the external output section. It can be installed easily.

  Since the exposed region is formed in the vicinity of the external output unit, it is possible to suppress noise from being mixed into the electrical signal through the portion of the output wiring from the exposed region to the external output unit. Therefore, the possibility that noise is included in the electrical signal output to the outside from the external output unit can be reduced as much as possible. As a result, the electrical signal output to the outside via the output terminal is compared to the case where the element for noise removal is not arranged and the case where the element for noise removal is arranged at a position far from the external output unit. The reliability of information can be increased.

  According to the invention (6), the on-vehicle sound reproducing device includes the wiring board. As a result, even when the wiring for transmitting an electrical signal to the outside through the output terminal is arranged close to other electronic devices, the noise included in the electrical signal output through the output wiring and the output terminal However, it is possible to prevent other electronic devices from being affected. Therefore, malfunctions can be prevented from occurring in other electronic devices.

  According to the invention (9), an electronic device includes the wiring board. Thereby, noise included in the electric signal output via the output wiring and the output terminal can be removed in the vicinity of the external output unit. Moreover, it can suppress that noise mixes in an electrical signal through the part from an exposure area | region to an external output part. Therefore, the information of the electrical signal output to the outside through the output terminal is compared with the case where the element for noise removal is not arranged and the case where the element for noise removal is arranged at a position far from the external output unit. The reliability can be increased.

  Hereinafter, a plurality of embodiments for carrying out the present invention will be described with reference to the drawings. In the following description, parts corresponding to matters already described in the forms preceding each form may be denoted by the same reference numerals, and overlapping descriptions may be omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in the preceding section. Not only the combination of the parts specifically described in each embodiment, but also the embodiments can be partially combined as long as the combination does not hinder. The following description also includes descriptions of the wiring board 10, the on-vehicle sound reproducing device 11, and the electronic device.

(First embodiment)
FIG. 2 is a perspective view of the wiring board 10 according to the first embodiment of the present invention. FIG. 3 is a plan view of the wiring board 10 according to the first embodiment of the present invention. In FIG. 2, the substrate body 12 and the auxiliary substrate 13 are shown disassembled in the thickness direction Z of the substrate body 12.

  In the present embodiment, the wiring board 10 is a board that outputs an electrical signal to the outside, and the electrical signal that is output to the outside is an electrical signal that represents acoustic information. The on-vehicle sound reproducing device 11 is mounted on a vehicle and includes a wiring board 10. The on-vehicle sound reproduction device 11 is a device that reproduces sound, including a portion that outputs an electrical signal output from the wiring board 10 as sound. The on-vehicle sound reproducing device 11 is an electronic device that includes electronic components. The vehicle sound reproducing device may further handle character information, count information, and image information, and may have a function of further recording, erasing, and rewriting information on a recording medium. In the present embodiment, the on-vehicle sound reproducing device 11 is mounted on an automobile.

  The wiring board 10 includes a board body 12 and an auxiliary board 13. The substrate body 12 is provided with a plurality of output wirings for outputting electrical signals to the outside, and has an external output unit 16. The external output unit 16 is provided with a plurality of output terminals 17 that output electrical signals from the output wiring. An exposed region 18 is formed in the vicinity of the external output unit 16 in the substrate body 12, and the output wiring is exposed in the exposed region 18. The auxiliary substrate 13 is installed in the exposed region 18 and has an element 19 for removing noise. The element 19 for removing noise is installed by being electrically connected to a portion exposed in the exposed region 18 of the output wiring. Hereinafter, the element 19 for noise removal is referred to as a “noise removal element” 19.

  The substrate body 12 is provided with digital parts and analog parts. The digital component includes a component that processes audio information recorded as a digital signal on a recording medium, for example. The analog component includes an amplifier that amplifies the analog signal after being converted from digital to analog. Due to the processing of the digital component, noise may be output from the digital component, and noise may be superimposed on the signal read from the recording medium. If this noise is input to the analog component in the same manner as a normal electrical signal, the analog component may amplify the noise.

  An end portion of the output wiring provided on the substrate body 12 is connected to the output terminal 17 in the external output unit 16, and the output terminal 17 is connected to a component outside the wiring substrate 10. A plurality of output wirings and output terminals 17 are provided on the substrate body 12, and the output wirings and the output terminals 17 are connected in a one-to-one correspondence. The plurality of output wirings and the plurality of output terminals 17 form part of a signal transmission path for outputting an audio signal from the substrate body 12 to the outside as an electrical signal. The electrical signal transmitted through the output terminal 17 is an electrical signal having the same waveform as that of the sound, and the output terminal 17 is connected to the speaker 23 outside the wiring board 10, so that the electrical signal transmitted through the output terminal 17 is transmitted. The signal information is output from the speaker 23 as sound.

  An input terminal and a ground terminal different from the output terminal 17 are formed in the external terminal. The input terminal forms a part of a transmission path through which a signal for starting the in-vehicle sound reproducing device 11 is transmitted. This signal is a signal input to the board body 12 from the outside of the wiring board 10 and is input to the wiring board 10 by, for example, starting an automobile engine. The ground terminal is a terminal connected to the frame house by a conductive wire, and is a terminal having a high grounding effect as a ground as compared with a terminal in which other components are arranged in the wiring path to the frame house. The wiring that is electrically connected to the input terminal and forms part of the transmission line in the board body 12 is referred to as “input wiring”, and is electrically connected to the ground terminal and forms part of the transmission line in the board body 12. The wiring to be performed is referred to as “ground wiring”.

  FIG. 4 is a diagram illustrating the configuration of the in-vehicle sound reproducing device 11 according to the first embodiment of the present invention. A wiring connected to the output terminal 17 in the external output unit 16 and forming a signal transmission path outside the wiring board 10 is connected to a speaker 23 provided outside the wiring board 10. When this wiring is referred to as “out-of-board wiring” 20, a part of the out-of-board wiring 20 may be disposed in the vicinity of other electronic components mounted on the automobile. Therefore, if noise is superimposed on the electrical signal output from the board body 12 to the outside of the wiring board 10 via the output terminal 17, this noise is transmitted through the board wiring 20 and arranged near the board wiring 20. Noise may affect other electronic components that are used. Since other electronic components are installed on the assumption that there is no noise, there are many undesired adverse effects when the effects of noise are observed.

  The noise from the board body 12 is generated as an electromagnetic wave from an electronic component included in the board body 12 and propagated to the outside of the wiring board 10 as an electromagnetic wave, via the output terminal 17 and the wiring 20 outside the board. There are noise transmitted and noise transmitted from the substrate wiring 20 to the outside of the substrate wiring 20 as electromagnetic waves while being transmitted through the substrate wiring 20. Among these influences of noise, the influence of noise that is emitted as an electric wave from an electronic component included in the board body 12 and propagates as an electromagnetic wave to the outside of the wiring board 10 is as the distance from the electronic part of the board body 12 that emits noise increases. It becomes smaller and becomes smaller in inverse proportion to the square of the distance from the electronic component.

  Compared with the influence of noise propagated as electromagnetic waves from the electronic components of the board body 12, the influence of noise transmitted to the outside of the wiring board 10 via the outside wiring 20 is transmitted through the conductor layer 27. The rate of attenuation is small, and the distance from the wiring board 10 is not a large attenuation factor. Therefore, by removing noise transmitted to the outside of the wiring board 10 via the output terminal 17, it is possible to effectively prevent the adverse effects of noise on other electronic components.

  In the present embodiment, the substrate body 12 is generally formed in a flat plate shape, and a plurality of electronic components are mounted on one surface among the surfaces perpendicular to the thickness direction Z. The substrate body 12 may be a single layer substrate or a substrate composed of a plurality of layers. When viewed in the thickness direction Z, the substrate body 12 is generally formed in a rectangular shape, and an output wiring is provided in the vicinity of the corner portion so as to protrude in the thickness direction Z and the sides forming the rectangle. As for the output wiring, at least a plurality of output wirings for outputting audio signals are arranged in the vicinity of one corner to form one external output unit 16. The thickness direction Z of the substrate is simply referred to as “thickness direction” Z.

  The external output unit 16 is a resin cover body 21 formed so as to cover the plurality of output terminals 17 in order to prevent the parts that fix the plurality of output terminals 17 and the other parts from contacting the output terminals 17. Formed. The output terminal 17 included in the external output unit 16 is formed so as to protrude in one direction, and the terminal of the board wiring 20 formed corresponding to the external output unit 16 is fitted from this direction, and the output terminal 17 is electrically connected to the output terminal 17. Connected.

  The exposed region 18 is formed on one surface perpendicular to the thickness direction Z of the substrate body 12, and the auxiliary substrate 13 is substantially formed in a flat plate shape, and the thickness direction is made to coincide with the thickness direction Z of the substrate body 12. Installed. The noise removal element 19 includes a capacitor 22. A through pin 24 is disposed on the substrate body 12, and the through pin 24 protrudes from the exposed region 18. A through hole 26 is formed in the auxiliary substrate 13, and the through hole 26 is formed corresponding to the through pin 24. The auxiliary substrate 13 is attached to the substrate body 12 with the through pins 24 inserted into the through holes 26. The through pin 24 is electrically connected to the output wiring and the output terminal 17 in the exposed region 18, and the noise removing element 19 is electrically connected to the through pin 24 on the auxiliary substrate 13. In the thickness direction Z, the direction in which the exposed region 18 faces is referred to as “thickness direction one” Z1, and in the thickness direction Z, the direction opposite to the thickness direction one Z1 is referred to as “thickness direction other” Z2.

  A part of the output wiring electrically connected to the output wiring is exposed on one surface of the substrate body 12 in the exposed region 18. The exposed region 18 is formed in the vicinity of the corner where the external output unit 16 is formed, and forms part of one surface on the Z1 side in the thickness direction of the substrate body 12. A part of the output wiring exposed in the exposed region 18 is formed by the through pin 24. A part of the penetrating pin 24 projects perpendicularly to the exposed region 18 from the exposed region 18 in one thickness direction Z1. That is, it protrudes from the one surface in the thickness direction Z1 perpendicularly to the one surface of the substrate body 12. The area of the exposed region 18 is set smaller than the area of one surface of the substrate body 12. The length in the thickness direction Z of the portion of the through pin 24 that protrudes from the exposed region 18 is set to a dimension that is larger than the thickness of the auxiliary substrate 13.

  In the exposed region 18, a part of the wiring connected to the input terminal and a part of the wiring connected to the ground terminal are exposed. A part of the wiring connected to the input terminal and a part of the wiring connected to the ground terminal are also formed as the through pin 24 in the exposed region 18 and protrude from the exposed region 18 in one thickness direction Z1. The length of the portion of the penetrating pin 24 that protrudes from the exposed region 18 is also set as a dimension that is larger than the thickness of the auxiliary substrate 13.

  Of the part of the output wiring exposed in the exposed region 18, the part of the input wiring, and the part of the ground terminal, a part of the input wiring is formed corresponding to the largest current. When the engine key switch is turned on, a voltage of approximately 12 V is applied to the input wiring. Therefore, at least the input wiring formed in the vicinity of the external output unit 16 is designed and formed with a cross-sectional area having durability even with respect to a current generated when a voltage of 12 V is applied.

  The external output unit 16 is provided on the side opposite to the surface on which the exposed region 18 of the substrate body 12 is formed, and the substrate body 12 from the other Z2 in the thickness direction with respect to the portion where the exposed region 18 is formed. It is arranged in contact with the main body 12. In order to reduce the size of the external output unit 16, the output terminal 17, the input terminal, and the ground terminal of the external output unit 16 are arranged as densely as possible. As a result, the output wiring, input wiring, and ground wiring in the exposed region 18 in the vicinity of the external output unit 16 are also densely arranged. The noise removal element 19 is electrically connected to each output wiring and ground wiring, and is provided between each output wiring and ground wiring. In addition, since a plurality of output wirings are provided, a plurality of noise removal elements 19 are also provided.

  Therefore, if a plurality of noise removing elements 19 are individually installed, the wiring near the external output unit 16 becomes denser. In particular, a voltage of 12 V is applied to the input wiring, and the current generated in the input wiring may possibly affect the wiring near the input wiring. Further, if the plurality of noise removing elements 19 are individually installed in the vicinity of the external output unit 16 where wirings are densely arranged, installation takes time and work becomes complicated. Therefore, in the prior art, when the noise removing element 19 is installed on the substrate body 12, the noise removing element 19 is installed at a position away from the external output unit 16 and sparser than the vicinity of the external output unit 16.

  In the present embodiment, the noise removing element 19 is installed in advance on the auxiliary substrate 13, and the auxiliary substrate 13 is electrically connected to the surface of the substrate body 12, thereby separating from the one surface of the substrate body 12 in the thickness direction Z. A noise removing element 19 is installed at the position. Thereby, a plurality of noise removing elements 19 can be arranged in the vicinity of the output terminal 17. On the auxiliary substrate 13, the plurality of noise removing elements 19 are integrally provided. Therefore, if the auxiliary substrate 13 is fixed on the substrate body 12, a plurality of noise removing elements 19 can be fixed. Since the plurality of noise removing elements 19 are not individually moved and displaced during the electrical connection of the auxiliary substrate 13, electrical connection with solder or the like can be easily performed. Since the operation can be easily performed, the electrical connection to the output wiring, the input wiring, and the ground wiring can be ensured.

  Even if the noise removing element 19 is installed at a position away from the external output unit 16, the noise removing element 19 can remove noise superimposed on the electric signal output from the substrate body 12. However, while the noise removing element 19 removes the noise and is transmitted to the output terminal 17, the noise emitted as an electromagnetic wave from the electronic component that generates noise in the substrate body 12 is superimposed on the electric signal again. there is a possibility. Since the output wiring from the noise removing element 19 to the output terminal 17 is provided in the board body 12, the distance from the other electronic parts of the board body 12 is closer than the electronic parts outside the wiring board 10. Therefore, the influence of noise on the output wiring from the noise removing element 19 to the output terminal 17 is large.

  The possibility of noise mixing is greatly reduced by shortening the output wiring from the noise removing element 19 to the output terminal 17. The phenomenon that other electronic components outside the wiring board 10 are adversely affected by noise transmitted to the outside of the wiring board 10 via the output terminal 17 is that the length of the output wiring from the noise removing element 19 to the output terminal 17 is large. It is prevented by setting it to a few millimeters (abbreviation “mm”).

  The noise removing element 19 removes noise in a frequency band from 312 MHz to 315 MHz. The noise removing element 19 may remove noise in a frequency band of 2 GHz or more and 5 GHz or less, and preferably removes both noise of a frequency band of 312 MHz or more and 315 MHz or less and a frequency band of 2 GHz or more and 5 GHz or less. To do.

  Some electronic devices mounted on automobiles are equipped with electronic components that can switch modes in response to electromagnetic waves. For example, a keyless entry that remotely controls the opening and closing of the door of a car, a remote starter that remotely controls the start of a car engine, and a non-stop automatic toll collection (abbreviated as “ETC”) system. For example, the wiring of the in-vehicle sound reproducing device 11 according to the related art is disposed in the vicinity of the receiving unit that receives electromagnetic waves in the keyless entry, and the noise from the output terminal 17 is received through the wiring in the vicinity of the receiving unit. If this is adversely affected, the electromagnetic wave used for the keyless entry becomes difficult to be received by the receiving unit, causing a malfunction of the keyless entry.

  Since the frequency band of the electromagnetic wave used for the keyless entry is 312 MHz or more and 315 MHz or less, the noise removing element 19 in the present embodiment removes noise in the frequency band of 312 MHz or more and 315 MHz or less, so that the present embodiment is temporarily used. Even if the wiring of the on-vehicle sound reproducing device 11 is arranged in the vicinity of the receiving unit of the keyless entry, it is possible to prevent malfunction of the keyless entry.

  For example, the wiring of the in-vehicle sound reproducing device 11 according to the related art is arranged in the vicinity of the receiving unit that receives electromagnetic waves in the ETC system, and noise from the output terminal 17 is received via the wiring in the vicinity of the receiving unit. If this is adversely affected, the electromagnetic wave used in the ETC system becomes difficult to be received by the receiving unit, causing a malfunction of the ETC system. If the ETC system malfunctions, there is a possibility that the gate will not open at the toll gate on the highway, and it is necessary to stop the car unexpectedly. This may lead to an abnormal approach of the following vehicle, and further increases the possibility of a rear-end collision.

  Since the frequency band of the electromagnetic wave used in the ETC system is 2 GHz or more and 5 GHz or less, the noise removing element 19 in the present embodiment removes noise in the frequency band of 2 GHz or more and 5 GHz or less, so that the present embodiment is temporarily used. Even if the wiring of the in-vehicle sound reproducing device 11 is arranged in the vicinity of the receiving unit of the ETC system, it is possible to prevent malfunction of the ETC system. Therefore, an unexpected stop of the vehicle can be prevented, and a rear-end collision of the following vehicle is also prevented.

  Still more preferably, the noise removing element 19 removes noise in a frequency band of 20 kHz to 10 GHz. Among electronic devices mounted on automobiles, electronic devices that perform at least one of transmission and reception of electromagnetic waves use electromagnetic waves in some frequency bands in a frequency band of 20 kHz to 10 GHz. Therefore, by removing the noise in the frequency band of 20 kHz or more and 10 GHz or less by the noise removing element 19 in the present embodiment, the wiring of the on-vehicle sound reproduction device 11 according to the present embodiment is temporarily in the vicinity of an electronic device using electromagnetic waves. Even if the electronic devices are arranged, it is possible to prevent malfunction of those electronic devices.

  The auxiliary substrate 13 is formed corresponding to the shape of the exposed region 18 and slightly larger than the exposed region 18. The size of the auxiliary substrate 13 is roughly the same as that of the external output unit 16, and part of each of the output wiring, the input wiring, and the ground wiring exposed in the exposed region 18 from one thickness direction Z1. cover. Specifically, a through hole 26 corresponding to the through pin 24 of the output wiring, the input wiring, and the ground wiring is formed in the auxiliary substrate 13. Since a plurality of through pins 24 are provided, the same number of through holes 26 as the through pins 24 are formed.

  The auxiliary substrate 13 is formed to include the noise removing element 19, the conductor layer 27, and the insulating layer 28 that holds them, and the conductor layer is formed on a predetermined surface portion of the auxiliary substrate 13 at a portion that defines the through hole 26. 27 is provided. The correspondence relationship between the through hole 26 and the through pin 24 is determined in advance, and each through hole 26 penetrates the corresponding through hole 26. In this state, each through pin 24 is electrically connected to a part of the conductor layer 27 at a site defining the through hole 26 by, for example, solder. The auxiliary substrate 13 is mounted on the substrate body 12 with a predetermined surface portion facing one side in the thickness direction Z1. Thus, the electrical connection between each through pin 24 and the conductor layer 27 of the auxiliary substrate 13 can be performed from the Z1 side in the thickness direction of the auxiliary substrate 13.

  In a state where the auxiliary board 13 is mounted on the board body 12 and electrical connection between each through pin 24 and the conductor layer 27 of the auxiliary board 13 is completed, the output wiring and the ground wiring are connected via the noise removing element 19. Is done. The noise removing element 19 includes a predetermined capacitor 22 in the present embodiment. The capacitor 22 implements a low pass filter. The frequency band of noise removed by the capacitor 22 is determined by the resistance value of the resistor provided in the output wiring connected to the capacitor 22 and the capacitance of the capacitor 22.

  The auxiliary substrate 13 is provided in the vicinity of the external output unit 16 provided in the vicinity of the corner portion of the substrate body 12, and is installed in the corner portion of the substrate body 12 so that the thickness direction coincides with the substrate body 12. A plurality of electronic components are provided in other portions of the substrate body 12 excluding the exposed region 18. The substrate body 12 is formed in a shape having irregularities in one thickness direction Z1 by providing a plurality of electronic components. In some cases, a lid that covers a plurality of electronic components may be provided on one surface Z1 in the thickness direction of the substrate body 12 excluding the exposed region 18. The length of the through pin 24 projecting from the exposed region 18 in the thickness direction one Z1 and the dimension in the thickness direction Z of the noise removing element 19 provided on the auxiliary substrate 13 are among the plurality of electronic components provided on the substrate body 12. It is set to a size equal to or smaller than the dimension in the thickness direction Z of the electronic component protruding in the thickness direction one Z1.

  The length of the through pin 24 and the dimension in the thickness direction Z of the noise removing element 19 provided on the auxiliary substrate 13 are determined in this way, and the thickness direction of the auxiliary substrate 13 is made to coincide with the thickness direction Z of the substrate body 12 to assist By installing the substrate 13 on the substrate body 12, it is possible to prevent the space occupied by the substrate body 12 from increasing due to the installation of the auxiliary substrate 13.

  The wiring board 10 of this embodiment includes a board body 12 and an auxiliary board 13, and the vehicle sound reproducing device according to this embodiment includes the wiring board 10. As a result, it is possible to prevent noise from being transmitted to the outside of the wiring substrate 10 via the output terminal 17. However, for some of the automobiles or vehicle acoustic devices created based on the unified standard, the board for outputting audio information may be the wiring board 10 according to the present embodiment. It is.

  For example, in a predetermined automobile or vehicle acoustic device, the board body 12 in the present embodiment is mounted as a board for outputting audio information, and the auxiliary board 13 is not mounted first, so that an electronic device used in the automobile does not operate properly. It is also possible to additionally provide the auxiliary substrate 13 with respect to the substrate body 12 only when this occurs. Although a space for mounting the auxiliary board 13 on the board body 12 is necessary, the size of the space occupied by the wiring board 10 by mounting the auxiliary board 13 in this embodiment is determined by mounting the board. It is not big enough to force a change in form. Therefore, in most board mounting forms for outputting audio information, there is a space for mounting the auxiliary board 13 in the present embodiment, and mounting is not hindered.

  The noise removing element 19 mounted on the auxiliary substrate 13 can be replaced with another noise removing element 19 having a different standard. For example, when a failure occurs in an electronic device mounted on a car, the frequency band of noise that causes the failure can be estimated from the type of electronic device in which the failure occurs. The frequency band of noise that can be removed by the noise removal element 19 can be predicted from, for example, the capacitance of the capacitor 22 included in the noise removal element 19 and the resistance value of a resistor connected to the output wiring. Therefore, when an electronic device having a problem is specified, it is possible to provide the auxiliary substrate 13 with the noise removing element 19 corresponding to the cause of the problem and attach the auxiliary substrate 13 to the substrate body 12.

  Further, in the operation check operation after mounting the auxiliary substrate 13 on the substrate body 12, for example, when all the problems cannot be improved, the noise removing element 19 mounted on the auxiliary substrate 13 can be replaced. Temporarily, on the board body 12 in the vicinity of the external output unit 16, the operation of individually connecting or disconnecting the capacitors 22 and the like is performed by the output wiring, input wiring, and ground in the board body 12 in the vicinity of the external output unit 16. Since the wiring is congested, the work becomes complicated. On the other hand, the purpose of the auxiliary substrate 13 is to dispose the noise removing element 19 in the conductor layer 27 connected to the output wiring and the conductor layer 27 connected to the ground wiring. 27 can be made simpler than the exposed region 18 of the substrate body 12. Therefore, it is easier to replace the noise removing element 19 on the auxiliary substrate 13 than when the noise removing element 19 is directly connected to the substrate body 12.

  It is also possible to remove the auxiliary board 13 attached to the board body 12 from the board body 12 and to exchange it with another different auxiliary board 13. When the auxiliary substrate 13 is bonded to the substrate body 12 by soldering, the bonding is released by heating the bonding portion between the auxiliary substrate 13 and the substrate body 12 with a heat gun, for example. As a result, it is possible to remove or replace the auxiliary substrate 13 with a new one.

  Although it is possible to make the frequency band of the noise removed by the noise removal element 19 the frequency band of the whole range of 20 kHz or more and 10 GHz or less, the occurrence of noise in a specific frequency band is observed, or the specific frequency band In the case where the problem of other electronic devices can be eliminated by removing the noise, the structure of the noise removing element 19 and the auxiliary substrate 13 is reduced by narrowing the frequency band of the noise removed by the noise removing element 19. It can be simplified.

  Although the frequency band of less than 20 kHz may coincide with the frequency band of the vibration wave of the sound and the frequency band of the electric signal representing the sound information, in most cases, there is no problem even if the frequency band of the sound is less than 10 kHz. In addition, the frequency band of electromagnetic waves used for in-vehicle electronic devices is almost 10 GHz or less. Therefore, the frequency band of noise removed by the noise removing element 19 can be set as any frequency band of 10 kHz to 10 GHz.

  In this embodiment, the penetration pin 24 protrudes from the substrate body 12 in the thickness direction one Z1. The portion of the through pin 24 that protrudes from the exposed region 18 functions as an antenna, so that the through pin 24 is affected by an electromagnetic field formed in the vicinity of the through pin 24, receives electromagnetic waves, and sends noise to the output terminal 17. Although there is a possibility of transmission, it is possible to prevent the through pin 24 from having a function as an antenna by installing the auxiliary substrate 13 in a state where the through pin 24 is inserted into the through hole 26.

  According to the first embodiment, the exposed region 18 is formed in the vicinity of the external output unit 16 in the substrate body 12, and the output wiring is exposed in the exposed region 18. The auxiliary substrate 13 is installed in the exposed region 18 and has a noise removing element 19. The noise removing element 19 is installed in electrical connection with the output wiring. As a result, the noise removing element 19 can be disposed in the vicinity of the external output unit 16. Therefore, noise included in the electrical signal output via the output wiring and the output terminal 17 can be removed in the vicinity of the external output unit 16. By installing the auxiliary substrate 13 in the exposed region 18, it is possible to arrange an element for noise removal, so that the element for noise removal can be placed on the substrate body without overcrowding the wiring in the vicinity of the external output unit 16. 12 can be easily installed.

  Since the exposed region 18 is formed in the vicinity of the external output unit 16, it is possible to suppress noise from being mixed into the electrical signal through the portion from the exposed region 18 to the external output unit 16 in the output wiring. Therefore, the possibility that noise is included in the electrical signal output to the outside from the external output unit 16 can be reduced as much as possible. As a result, compared with the case where the noise removal element 19 is not arranged and the case where the noise removal element 19 is arranged at a position far from the external output unit 16, the information of the electrical signal information output to the outside via the output terminal 17 is reduced. Reliability can be increased.

  The noise removal element 19 is installed at a position away from the one surface of the substrate body 12 in the thickness direction Z. In the auxiliary substrate 13, the plurality of noise removing elements 19 are integrally provided. Thus, if the auxiliary substrate 13 is fixed on the substrate body 12, a plurality of noise removing elements 19 can be fixed. Since the plurality of noise removing elements 19 are not individually moved and displaced during the electrical connection operation of the auxiliary substrate 13, electrical connection with solder or the like can be easily performed. Since the operation can be easily performed, the electrical connection to the output wiring, the input wiring, and the ground wiring can be ensured.

  If each noise removal element 19 is soldered individually by hand, the reliability of the connection of the noise removal element 19 depends on the reliability of manual work repeated by the operator. On the other hand, in the present embodiment, since the connection of the plurality of noise removing elements 19 is completed in a single operation of attaching the auxiliary substrate 13 to the substrate body 12, the reliability of the electrical connection of the noise removing elements 19 Can be improved. As a result, the reliability of noise removal can be increased.

  Further, according to the first embodiment, the exposed region 18 is formed on one surface perpendicular to the thickness direction Z of the substrate body 12, and the auxiliary substrate 13 matches the thickness direction with the thickness direction Z of the substrate body 12. Installed. As a result, the space occupied by the wiring board 10 can be reduced as compared with the case where the auxiliary board 13 is installed at an angle with respect to the board body 12.

  Further, according to the first embodiment, the noise removing element 19 includes the capacitor 22. As a result, high-frequency noise included in the electrical signal can be prevented from being output via the output terminal 17.

  According to the first embodiment, the substrate body 12 is provided with the through pins 24, and the auxiliary substrate 13 is attached to the substrate body 12 with the through pins 24 inserted into the through holes 26. The through pin 24 is electrically connected to the output wiring and the output terminal 17 in the exposed region 18, and the noise removing element 19 is electrically connected to the through pin 24 on the auxiliary substrate 13.

  Accordingly, the auxiliary substrate 13 can be firmly attached to the substrate body 12 as compared with the case where the auxiliary substrate 13 is connected to the substrate body 12 by, for example, solder. Therefore, the auxiliary substrate 13 can be prevented from being detached from the substrate body 12 even when used in an environment where vibration occurs. Since the noise removing element 19 is electrically connected to the output wiring and the output terminal 17 through the through pin 24 in the vicinity of the external output unit 16, the position from the position where the noise removing element 19 is connected to the output terminal 17. The possibility of noise being mixed into the electrical signal can be reduced through the output wiring. Therefore, it is possible to achieve both of firmly fixing the auxiliary substrate 13 to the substrate body 12 and removing noise and reducing the possibility of noise removal as much as possible.

  In the first embodiment, when the noise removing element 19 removes noise in a frequency band of 20 kHz or more and 10 GHz or less, noise having a frequency higher than the frequency band used as sound is more external than the external output unit 16. The output can be prevented. Therefore, it is possible to prevent noise from being superimposed on the sound even when the information of the output electric signal is converted into the sound.

  Further, according to the first embodiment, the on-vehicle sound reproducing device 11 includes the wiring board 10. As a result, even when a wiring for transmitting an electrical signal to the outside through the output terminal 17 is disposed in the vicinity of another electronic device, the wiring is included in the electrical signal output through the output wiring and the output terminal 17. It is possible to prevent the generated noise from affecting other electronic devices. Therefore, malfunctions can be prevented from occurring in other electronic devices.

  In the first embodiment, when the noise removal element 19 removes noise in the frequency band of 312 MHz or more and 315 MHz or less, noise in the same frequency band as that used for keyless entry is transmitted via the output terminal 17. Transmission to the outside can be prevented. Therefore, it is possible to prevent the electronic device realizing the keyless entry from being affected by noise from the substrate body 12. As a result, it is possible to prevent malfunctions in electronic devices that realize keyless entry.

  In the first embodiment, when the noise removing element 19 removes noise in the frequency band of 2 GHz or more and 5 GHz or less, noise in the same frequency band as that used in the ETC system is transmitted via the output terminal 17. Output to the outside can be prevented. Therefore, it is possible to prevent the electronic device that realizes the ETC system from being affected by noise from the substrate body 12. As a result, it is possible to prevent malfunction of the electronic device that realizes the ETC system.

  Moreover, according to 1st Embodiment, the noise removal element 19 contained in the vehicle-mounted sound reproduction apparatus 11 removes the noise of a frequency band 20 kHz or more and 10 GHz or less. Thereby, it is possible to prevent the noise from the substrate body 12 from affecting electronic devices mounted on the vehicle. Therefore, it is possible to achieve both outputting sound and improving the reliability of operation of the electronic device mounted on the vehicle.

  In this way, the frequency band of noise removed by the noise removing element 19 corresponds to an electronic device installed in the vicinity of the wiring of the in-vehicle sound reproducing device 11, and the electronic device determines the frequency band of noise to be removed. The frequency band of the electromagnetic wave to be used. Thus, the effect that the malfunction of the electronic device can be prevented is based on the premise that noise removal by the noise removal element 19 is reliable. In other words, the effect that the malfunction of the electronic device can be prevented by reliably preventing noise from being superimposed on the electrical signal transmitted to the outside from the output terminal 17 is remarkably improved. Become.

  In addition, the noise removing element 19 removes noise of a specific frequency corresponding to another electronic device, so that the malfunction of the electronic device can be prevented by installing the noise removing element 19 in the vicinity of the output terminal 17. And even more certain. In the present embodiment, the noise removing element 19 removing noise of a specific frequency and the noise removing element 19 being installed in the vicinity of the output terminal 17 are not independent of each other but are related to each other. . Reliably preventing noise output greatly contributes to preventing malfunction of electronic devices.

(Second Embodiment)
FIG. 5 is a perspective view of the wiring board 10 according to the second embodiment of the present invention. In FIG. 5, the wiring substrate 10 is shown exploded in the thickness direction Z of the substrate body 12. The wiring board 10 according to the second embodiment is similar to the wiring board 10 according to the first embodiment, and hereinafter, the description will focus on differences between the second embodiment and the first embodiment.

  In the second embodiment, at least the surfaces of the output wiring and the ground wiring exposed in the exposed region 18 are formed in a circular shape as viewed from the thickness direction one Z1. That is, it is formed in a circular shape when viewed perpendicular to the exposed region 18. These portions formed to be exposed in a circle in the exposed region 18 are referred to as “circular exposed portions” 32. Portions other than the circular exposed portion 32 in the exposed region 18 are formed of an insulator such as resin. The circular exposed portion 32 may have a surface formed in the same plane as the resin portion located around the circular exposed portion 32, or the surface portion of the circular exposed portion 32 may be the periphery of the circular exposed portion 32. It may be formed so as to protrude slightly in the thickness direction one side Z1 from the resin part.

  FIG. 6 is a perspective view showing the auxiliary substrate 13 according to the second embodiment of the present invention with the surface to be disposed facing the substrate body 12 facing upward. The auxiliary substrate 13 includes a circular through conductor 33 having a size corresponding to the circular exposed portion 32 at a position corresponding to the circular exposed portion 32 of the substrate body 12. The through conductor 33 penetrates the auxiliary substrate 13 in the thickness direction Z and is exposed on both surfaces perpendicular to the thickness direction Z of the auxiliary substrate 13. Accordingly, the through conductor 33 forms a transmission path that penetrates the auxiliary substrate 13 in the thickness direction Z. In the perspective view of FIG. 5, a noise removing element 19 is provided on one side Z <b> 1 in the thickness direction of the auxiliary substrate 13 shown upward. The noise removing element 19 is electrically connected to each through conductor 33 formed corresponding to each output wiring and the through conductor 33 formed corresponding to the ground wiring.

  In the present embodiment, the auxiliary board 13 is fixed to the board body 12 by screwing with a screw component penetrating the auxiliary board 13. The screw component for fixing the auxiliary substrate 13 to the substrate body 12 may be a bolt or a screw component with a slot. In this embodiment, the screw part is assumed to be a screw 34. The shaft portion of the screw 34 penetrates the screw hole 36 formed through the auxiliary substrate 13 from the Z1 side in the thickness direction, and is screwed into the female screw portion 38 formed in the substrate body 12, whereby the auxiliary substrate 13 is fixed to the substrate body 12.

  In the present embodiment, the external output unit 16 is provided on the other side Z2 in the thickness direction of the portion of the substrate body 12 where the exposed region 18 is formed, and a shaft portion of a screw component that fixes the auxiliary substrate 13 to the substrate body 12. Is screwed into a part of the cover body 21 forming the external output unit 16. Thus, the screw component fixes both the auxiliary substrate 13 and the cover body 21 to the substrate body 12.

  The auxiliary board 13 attached to the board body 12 by the screw component is pressed and fixed to the board body 12 in the thickness direction Z. Thereby, the through conductor 33 comes into contact with the circular exposed portion 32 of the substrate body 12 and is electrically connected thereto. Among the through conductors 33, the through conductors 33 corresponding to the output wiring and the ground wiring are connected to each other via a noise removing component. In addition, electrical connection between the ground wiring and the noise removing element 19 is also realized.

  As described above, the mounting of the auxiliary board 13 to the board body 12 is realized by fixing with the screw parts, so that the arrangement and the electrical connection of the noise removing parts are realized by fixing with the screw parts. Therefore, the auxiliary board 13 can be removed from the board body 12 by removing the screw parts, and the auxiliary board 13 can be easily replaced as compared with the case where the auxiliary board 13 is joined to the board body 12 by soldering or the like. Can be.

  Therefore, for example, after mounting the noise removing element 19 for removing noise in a frequency band corresponding to the most disturbing electromagnetic interference on the auxiliary substrate 13 and attaching the auxiliary substrate 13 to the substrate body 12, the assumed electromagnetic interference is the frequency When a fault with a different band occurs, a noise removing element 19 that can remove noise in the same frequency band as the frequency band of the electromagnetic wave that actually caused the fault is mounted on the other auxiliary board 13 and attached to the board body 12. By replacing the auxiliary substrate 13 with another auxiliary substrate 13, the electromagnetic interference that actually caused the injury can be eliminated.

  Since the replacement of the auxiliary substrate 13 with respect to the substrate body 12 can be performed by fixing with screw parts and releasing the fixation, the substrate body 12 can be prevented from being damaged even when the replacement is repeated as compared with the case where solder is used. Can do. Also in the second embodiment, the same effects as those in the first embodiment can be achieved.

  In the first embodiment, the auxiliary substrate 13 is fixed to the substrate body 12 by soldering. In the second embodiment, the auxiliary substrate 13 is fixed by screwing. In other embodiments, for example, It may be fixed by a conductive adhesive, bump, rivet or the like.

In the first and second embodiments, the electronic device on which the wiring board 10 is mounted is the on-vehicle sound reproducing device 11, but in other embodiments, the electronic device on which the wiring board 10 is mounted is on-vehicle use. The sound reproducing device 11 may not be used. By providing the wiring board 10 in the electronic device, it is possible to prevent the noise from the board body 12 from affecting electronic components other than the wiring board 10 included in the electronic device. Even if another electronic device is disposed in the vicinity of the electronic device including the wiring board 10, it is possible to prevent the noise from the substrate body 12 from affecting the other electronic device.

It is a circuit diagram showing the wiring relationship in the wiring board 1 which concerns on a prior art. 1 is a perspective view of a wiring board 10 according to a first embodiment of the present invention. 1 is a plan view of a wiring board 10 according to a first embodiment of the present invention. It is a figure showing the structure of the vehicle-mounted sound reproducing apparatus 11 which concerns on 1st Embodiment of this invention. It is a perspective view of the wiring board 10 which concerns on 2nd Embodiment of this invention. It is the perspective view which represented the auxiliary | assistant board | substrate 13 in 2nd Embodiment of this invention with the surface which should be arrange | positioned facing the board | substrate body 12 facing upwards.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Wiring board 11 Vehicle-mounted sound reproduction apparatus 12 Board | substrate main body 13 Auxiliary board 16 External output part 17 Output terminal 18 Exposed area 19 Noise removal element 22 Capacitor 24 Through-pin 26 Through-hole

Claims (9)

A substrate body provided with a plurality of output wirings for outputting electrical signals to the outside,
An external output unit provided with a plurality of output terminals for outputting an electrical signal from the output wiring;
A substrate body in which an exposed region where the output wiring is exposed is formed in the vicinity of the external output unit;
An auxiliary board installed in the exposed area,
A wiring board comprising: an auxiliary board having an element for noise removal that is electrically connected to a portion exposed in the exposed region of the output wiring. The exposed region is formed on one surface perpendicular to the thickness direction of the substrate body,
The wiring board according to claim 1, wherein the auxiliary board is installed such that a thickness direction thereof coincides with a thickness direction of the board body.   The wiring board according to claim 1, wherein the element for removing noise includes a capacitor.   The substrate body is provided with a through pin protruding from the exposed region, the auxiliary substrate has a through hole corresponding to the through pin, and the auxiliary substrate has the through pin inserted into the through hole. The wiring board according to claim 1, wherein the wiring board is attached to the board body in a state where the wiring board is formed.   The wiring board according to claim 1, wherein the element for removing noise removes noise in a frequency band of 20 kHz or more and 10 GHz or less. The wiring board according to any one of claims 1 to 4, comprising:
The on-vehicle sound reproducing device, wherein the noise removing element removes noise in a frequency band of 312 MHz to 315 MHz. The wiring board according to any one of claims 1 to 4, comprising:
The on-vehicle sound reproducing device, wherein the noise removing element removes noise in a frequency band of 2 GHz to 5 GHz.   An on-vehicle sound reproducing device comprising the wiring board according to claim 5.   An electronic apparatus comprising the wiring board according to claim 1.

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