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Vehicle-onboard signal processing device and vehicle-onboard radar system
| Details |
Inventors: Suzuki, Mitsushige; Takano, Kazuaki; Fukute, Ryuji;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Pihulic; Dan
Assistant Examiner:
Attorney, Agent or Firm: Crowell & Moring LLP
In order to magnetically shield the transmission line which connects the external connector mounted on the outer housing with the internal circuit and also to make it possible to freely mount the external connector without being limited by the position of the internal circuit, an outer housing 60 consists of an outer housing main body 61 and a shielding layer 62 applied to the inner-periphery surface of the outer housing 60. An transmission line 73 extends from the internal circuit through the outer-periphery side of the shielding layer 62 of the outer housing 60 along the shielding layer 62 to the desired position, where the external connector 70 is placed. |
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DETAILED DESCRIPTION However, in the prior art, if the signal line connects the external connector placed on the outer housing to the internal circuit, because the signal line is covered with the cylindrical shaft made of conductive material, it is necessary to place the connector at a location on the outer housing that is closest to the internal circuit; as a result, a problem arises because of the limited placement of the connector.
This kind of limitation is not preferable for a vehicle-onboard device which already has strict limitations on size and placement.
For example, when a vehicle-onboard device is to be mounted in a concave portion of a vehicle, if an external connector is placed at a certain location on the vehicle-onboard device, a problem arises in that an external connection cable cannot be connected to the connector.
Even if the external connection cable is connected, the cable may block and prevent the vehicle-onboard device from being mounted in the concave portion.
Further, if a cylinder of the appropriate length is properly bent and used instead of the magnetic shielding cylindrical shaft, the connector can be freely placed at any location.
However, in this case, a space to place the relatively long, bent cylinder is required in the outer housing, thereby increasing the size of the device.
Furthermore, the foregoing prior art has another problem with electromagnetic noise generated from the signal line leaking from the opening at the end portion of the internal circuit side of the cylindrical shaft, causing insufficient magnetic sealing.
Accordingly, in view of the foregoing problems of the prior art, a first objective of the present invention relating to this application is to provide a vehicle-onboard signal processing device which magnetically shields the transmission line that connects the external connection portion placed on the outer housing to the internal circuit and simultaneously makes it possible to mount the external connection portion at any location without increasing the size of the device
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Navigation and GPS 
