摘要:
A printed circuit board includes a ground layer, a power supply layer divided into a plurality of lands, a dielectric layer disposed so as to cover the plurality of lands of the power supply layer, and a conductor layer disposed so as to cover the dielectric layer. The plurality of divided lands are coupled to each other by electrostatic capacitors formed by each of the lands of the power supply layer and the conductor layer sandwiching the dielectric layer therebetween.
摘要:
A display panel module such as a liquid crystal display (LCD) panel module in an electronic apparatus is designed to receive a driving signal of a predetermined frequency. An electrically conductive frame or bezel of the display panel module tends to suffer from the transmission of electromagnetic waves which are related to the wavelength of the driving signal. An electrically conductive member is located behind the display panel and electrically connected to the electrically conductive frame. The electrically conductive member serves to diverge the electromagnetic waves out of the electrically conductive frame. This divergence of the electromagnetic waves serves to suppress the electromagnetic radiation out of the electrically conductive frame.
摘要:
An SG pattern is provided at the circumference of the outermost layer of a printed circuit board and the SG pattern is connected to a frame ground of a case by grounding plates so that the space between connection points is smaller than a distance determined by a signal wavelength. The grounding plates are disposed at three sides other than the side at which a connector mounting plate is disposed to hold the printed circuit board therebetween by leaf spring-like contacts. The mounting plate is connected to the SG pattern to be electrically connected to the grounding plate.
摘要:
An electronic apparatus is adapted to be used with a portable storage medium installed therein. The apparatus includes a mounting portion in which a unit for driving a portable storage medium is mounted. The mounting portion is constituted by a metal plate. When a storage medium is installed, an opening of the metal plate into which said storage medium is inserted is electrically connected between an upper portion and a lower portion thereof, so that the metal plate does not resonate with radio waves generated outside of the apparatus.
摘要:
The present invention provides a connector in which countermeasures against external noise and radiation noise are taken, and an information processing apparatus having such a connector, which suppresses both the external noise and radiation noise. The connector is disposed at an opening formed in an outer face of an information processing apparatus such that the connector does not project from the outer face, a shield cable being connected to the connector from the opening. An end face on the side of the opening is made of an insulative material. The connector includes a signal terminal which connects a signal line of the shield cable and a processing circuit of the information processing apparatus with each other and which is provided at a location other than the end face, and a shield conductor which connects a shield of the shield cable and a ground of the information processing apparatus with each other and which is provided at a location other than the end face.
摘要:
A control circuit for controlling a linearly variable speed cooling D.C. fan includes a stator including at least two pairs of main poles, two pairs of auxiliary poles and a Hall effect element provided at either of auxiliary poles. The control circuit also includes a rotor which as a casing, at least two pairs of N and S poles and a plurality of blades. Further, the control circuit includes a driving IC including an amplifier and two switching transistors, a temperature sensor detachable to a connector means, for determining a revolution speed of the D.C. fan that matches to the detected temperature, and a breakdown protection unit provided between said driving IC and said temperature sensor.
摘要:
In a first step, two conductive plates such as two zinc galvanized (electroplated) steel plates with films formed on surfaces thereof, are prepared; a flexible conductive material is held between these two zinc galvanized (electroplated) steel plates. A spacer is also held between the two zinc galvanized (electroplated) steel plates to regulate the space therebetween and a measurement object such as a conductive cloth is held between the flexible conductive material and at least one of the zinc galvanized (electroplated) steel plates. In a second step, the electric resistance between the two zinc galvanized (electroplated) steel plates is measured while the flexible conductive material is held together with the measurement object between the two conductive plates.
摘要:
The invention provides an electronic device that is environment-friendly and capable of achieving satisfactory noise prevention effect at low cost, and a housing implementing such electronic device. The housing has an electronic circuit disposed therein, and includes a component exposure section in which part of a conductive component disposed in the housing is exposed outward, a plate section made of a conductive material having a predetermined thickness, and spreading at a distance from the component exposure section, and a bridge section with the overall thickness thereof larger than the thickness of the plate section, extending along the component exposure section and electrically connecting the plate section and the conductive component.
摘要:
A printed-circuit board includes a shield pattern layer that is stacked on a surface layer with respect to at least one wiring pattern layer that includes a wide-pattern area having a wiring width of more than 1 millimeter. Moreover, the shield pattern layer includes a shield pattern that is, from a plane view, overlapped on the wide-pattern area, and grounded without being electrically connected to an internal layer of other wiring pattern layers.
摘要:
An electronic apparatus having a housing in which at least a heat source is housed, the housing being provided with an intake port and an exhaust port, the electronic apparatus comprising a cooling fan mounted in the exhaust port, an auxiliary cooling fan placed near the heat source, a first control portion for controlling a revolving speed of the cooling fan in accordance with a temperature of intake air, and a second control portion for controlling a revolving speed of the auxiliary cooling fan in a first mode when the revolving speed of the cooling fan is less than a reference speed and in a second mode when the revolving speed of the cooling fan is greater than the reference speed, the revolving speed of the auxiliary cooling fan controlled in the first mode being greater than the revolving speed of the auxiliary cooling fan controlled in the second mode.