In the related art, printed boards have been used as plate-shaped parts including electronic parts such as resistors, capacitors and semiconductor integrated circuit devices mounted thereon and to perform electrical wiring. In general, when constituting an electronic device, a plurality of printed boards are provided in parallel in a housing of the electronic device to contribute to a physical configuration or a functional configuration of the electronic device. Furthermore, various methods for fixedly supporting a multi-stage structure, which is formed by stacking printed boards using support members provided at four corners thereof in a housing, have been proposed.
Meanwhile, with a recent significant increase in the amount of information such as videos and images, various devices have been used to transmit high frequency signals such as millimeter wave signals at a high speed. For such a high speed data transmission device, it is necessary to transmit high frequency signals such as millimeter wave signals with no error.
FIG. 20 is a perspective view showing an example of the configuration of a high speed data transmission device 900 according to the related art. The high speed data transmission device 900 shown in FIG. 20 has a multi-stage structure formed by stacking two printed boards 1 and 2 using fixing members 3 provided at four corners thereof in order to transmit data between the printed boards 1 and 2 at a high speed. In FIG. 20, the high speed data transmission device 900 includes the two printed boards 1 and 2 and the four fixing members 3 for normal support, and the printed boards 1 and 2 are fixed in parallel to each other by the fixing members 3 provided at the four corners thereof. According to a method of fixing the printed boards 1 and 2, through holes 4 having a predetermined shape are opened in the four corners of each of the printed boards 1 and 2, the fixing members 3 are inserted into the through holes 4, and the printed boards 1 and 2 are held by the fixing members 3 while interposing the fixing members 3 therebetween.
The printed board 1 is provided on the upper surface thereof with a signal processing unit 5, a connector 7 and an electrical wiring 8. The electrical wiring 8 of the printed board 1 connects the signal processing unit 5 to the connector 7. The printed board 2 is provided on the upper surface thereof with a signal processing unit 6, a connector 7 and an electrical wiring 8. The electrical wiring 8 of the printed board 2 connects the connector 7 to the signal processing unit 6. According to the high speed data transmission device 900, a cable 9 is connected between the connector 7 of the printed board 1 and the connector 7 of the printed board 2, so that data is transmitted between the printed boards 1 and 2 at a high speed.
Meanwhile, in order to reduce the cost of the high speed data transmission device 900 and the like and improve the arrangement efficiency of the printed boards 1 and 2, there have been attempts to remove the connector 7 and the cable 9. In relation to the improvement of such a type of high speed data transmission device 900, Patent Literature 1 discloses an electronic device that performs data exchange using a wireless communication method.
According to the electronic device, device configuration units and a wireless communication unit are provided, and the wireless communication unit relays data exchange between the device configuration units through UWB wireless communication in a housing. Based on that fact, a radio wave absorber is provided in the housing to absorb an electromagnetic wave serving as noise of communication between the device configuration units via the wireless communication unit. When the electronic device is configured as described above, the radio wave absorber absorbs an electromagnetic wave in the housing, resulting in the suppression of multipath phasing in the housing.
Furthermore, Patent Literature 2 discloses fixing members for fixing a plurality of circuit boards and a module using the fixing members. According to the module, a plurality of fixing members provided with light waveguides are provided, optical coupling is achieved between one circuit board and the other circuit board at both ends of each fixing member, and the plurality of circuit boards are fixed while being spaced apart from each other at a predetermined distance. Based on that fact, an optical signal is propagated between the circuit boards through the light waveguides of the fixing members. When the module is configured as described above, it is possible to accurately transmit information between the circuit boards using an optical signal as a medium.