Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Shinichi Tanimoto

Ryo Matsubara

Hirotsugu Fusayasu

Seiji Hamada

Takeshi Nakayama

Hiroshi Ikeda

Yukihiro Fukumoto

Shinkuro Fujino

Osamu Shibata

Yoshiyuki Saito

Eiji Takahashi

Syoichi Mimura

An electromagnetic wave visualization device includes an image acquisition unit that captures an image of a target device, a measurement unit that measures an electromagnetic wave intensity of the target device, a controller that generates a composite image in which a measurement result of the electromagnetic wave intensity measured by the measurement unit is superimposed on the captured image of the target device acquired by the image acquisition unit, an output unit that outputs the composite image, and a distance measuring unit that measures a distance from the measurement unit to the target device. The controller determines, whether or not the distance measured by the distance measuring unit is within a predetermined distance at which the electromagnetic wave intensity in the frequency bandwidth is measurable, generates an alert in a case where the distance is not within the predetermined distance, and causes the output unit to output the alert.

Electromagnetic wave visualization device

An electromagnetic wave visualization device includes an image acquisition unit that captures an image of a target device, a measurement unit that measures an electromagnetic wave intensity of the target device, a controller that sets a measurement range of the measurement unit and generates a composite image in which a measurement result of the measured electromagnetic wave intensity is superimposed on the captured image of the target device acquired by the image acquisition unit, and an output unit that outputs the composite image generated by the controller, in which the controller generates the composite image including the measurement range of the measurement unit and outputs the composite image to the output unit.

A differential transmission line connector with little unwanted radiation noise is provided. A connector connects a differential transmission pattern for multiple transmission of a group of three differential signals and a differential transmission cable. The differential transmission pattern is provided with three signal lines, and the differential transmission cable also is provided with three signal lines. In a plane that is perpendicular to the longitudinal direction of the differential transmission pattern and the differential transmission cable, the signal lines are positioned at the apexes of an equilateral triangle. The connector is provided with three signal lines that connect, at identical lengths, the signal lines of the differential transmission pattern and the signal lines of the differential transmission cable, between a predetermined first plane of the planes that perpendicularly intersect the longitudinal direction of the differential transmission pattern and a predetermined second plane of the planes that perpendicularly intersect the longitudinal direction of the differential transmission cable.

Differential transmission line connector

A transmission cable that has three signal lines, and in which there is little unwanted radiation noise, is provided. In a section that is perpendicular to the longitudinal direction of the differential transmission cable, the distance between any two signal lines of the three signal lines is equal to a predetermined value. The differential transmission cable is twisted in its longitudinal direction. The differential transmission cable further includes a dielectric core line, and the signal lines are formed on the surface of the dielectric core line. In the differential transmission cable, the signal lines are formed in a helix in the longitudinal direction of the dielectric core line.

Transmission cable

A differential transmission line that has three or more signal lines and with which there is little unwanted radiation noise is provided. The differential transmission lineis provided with three signal lines, andthat transmit differential signals from a differential driver ICto a differential receiver IC, and the majority of the signal lines, andis provided in conductor layers Tand Tof a printed circuit board. The signal lines, andare provided with a signal line parallel segment, a signal line route length adjustment segment that is on the differential driver ICside and that connects from differential signal output terminalsEa,Eb, andEc in the differential driver ICto the signal line parallel segment, and a signal line route length adjustment segment that is on the differential receiver ICside and that connects from the signal line parallel segment to differential signal input terminals in the differential receiver IC, wherein the signal lines, andare formed such that their signal line route length adjustment segments on the differential driver ICside are equal in length to one another.

Differential transmission line

A radiation noise suppression circuit for a differential transmission line includes a differential transmission line which has plus line signal wiring to which a plus line signal of a differential signal is applied, and minus line signal wiring to which a minus line signal of the differential signal is applied, and connects a differential driver and a differential receiver. Plus line signal GND wiring and minus line signal GND wiring which are connected between the differential driver and the differential receiver are wired along the differential transmission line. A distance between the plus line signal wiring and the plus line signal GND wiring is substantially equal to a distance between the minus line signal wiring and the minus line signal GND wiring.

Radiation noise suppression circuit for differential transmission line

A radiation noise suppression circuit for a differential transmission line includes a differential transmission line which has plus line signal wiring of a differential signal and minus line signal wiring of the differential signal, and connects a differential driver and a differential receiver; signal GND wiring. A first impedance element and a second impedance element have substantially the same impedance value, and are connected in series between the plus line signal wiring and the minus line signal wiring at a location nearer to the differential receiver than a coil unit. A third impedance element is connected to a junction point. The first impedance element and the second impedance element are connected.

In a design aiding apparatus of the present invention, a plane clearance setting unit acquires information showing a predetermined margin, a component placement unit determines a placement area of a component such that, as seen in a lamination direction of a multilayer wiring board, at least one of the component and a pad connected to the component is included within a candidate area of a plane foil excluding a perimeter area, and a wiring unit determines a placement area of a wiring foil and a via in the same way that the placement area of the component is determined. Furthermore, in regard to a component, a component pad, a wiring foil, and a via whose placement areas have already been determined, a component placement inspection unit reports a design condition violation if the placement area of at least one of the component and the pad deviates outside the candidate area as seen in the lamination direction of the board, and a wiring inspection unit reports a design condition violation if the placement area of the wiring foil or the via deviates outside the candidate area as seen in the lamination direction of the board.

Wiring board design aiding apparatus, design aiding method, storage medium, and computer program

A CAD apparatus includes a determining unit for determining a component order in ascending order of impedance of components for passive components amongst components to be placed on a printed wiring board. The CAD apparatus places each passive component in the determined component order in a vicinity of power pins of non-passive components that are already placed.

Computer aided design apparatus for aiding design of a printed wiring board to effectively reduce noise

A layout check system checks whether a layout of a power source, a component including a power pin, and a bypass capacitor on a PCB and defined by layout data created using a CAD system allows the bypass capacitor to function effectively. A storage unit stores the layout data that includes information used as a basis to calculate a first value corresponding to impedance between the power pin and the power source and a second value corresponding to impedance between the power pin and the bypass capacitor. A calculation unit calculates the first value and the second value with use of the information. A judgment unit judges whether the layout allows the bypass capacitor to function effectively, by comparing the first value with the second value. When a result of the judgment is negative, an output unit outputs error information.

Layout check system

A signal line, being in a six-layer board and connecting terminalof componentwith terminalof componentrequires tamper-resistance. The signal line is composed of foilon an outside layer, a viafoilon the third layer, viafoilon the fourth layer, viaand foilon the sixth layer. Portions of the signal line that exist on outside layers are all hidden under circuit components. Foiland an end of viaare placed under componenton first layeran end of viais placed under componenton layeran end of viais placed under componenton layerthe other end of viais placed under componenton sixth layerthe other end of viais placed under componenton layerand foiland the other end of viaare placed under componenton layer

MULTILAYER BOARD IN WHICH WIRING OF SIGNAL LINE THAT REQUIRES TAMPER-RESISTANCE IS COVERED BY COMPONENT OR FOIL, DESIGN APPARATUS, METHOD, AND PROGRAM FOR THE MULTILAYER BOARD, AND MEDIUM RECORDING THE PROGRAM

Growing community of inventors

Kyoto, Japan

Shinichi Tanimoto