Abstract:
A filet F is added to a portion constituting a corner portion C equal to or smaller than 90° in a crossing portion X of wiring patterns 58b, 58c and 58d, and a wiring pattern 58 is formed. Since the filet F is added, the wiring patterns are not made thin and are not disconnected in the crossing portion X. Further, since there is no stress concentrated to the crossing portion X, disconnection is not caused in the wiring patterns and no air bubbles are left between the crossing portion X of the wiring patterns and an interlayer resin insulating layer so that reliability of a printed wiring board is improved.
Abstract:
The radiation noise suppression effect is enhanced by providing an insulation layer which is formed so that the circuit pattern is covered excepting at least a part of power source pattern or ground pattern on the substrate on which circuit pattern is formed, and a conductive layer which is formed so as to be connected to the uninsulated part of the power source pattern or the ground pattern on the insulation layer, by modifying pattern shape of the conductive layer and the insulation layer or by increasing or reducing the number of these layers.
Abstract:
The radiation noise suppression effect is enhanced by providing an insulation layer which is formed so that the circuit pattern is covered excepting at least a part of power source pattern or ground pattern on the substrate on which circuit pattern is formed, and a conductive layer which is formed so as to be connected to the uninsulated part of the power source pattern or the ground pattern on the insulation layer, by modifying pattern shape of the conductive layer and the insulation layer or by increasing or reducing the number of these layers.
Abstract:
Die Erfindung betrifft eine dreistufige Koppelanordnung für die elektrische Nachrichtenvermittlungstechnik. Bei einer bekannten dreistufigen und blockierungsfreien Koppelanordnung weisen die Koppelmatrizen, aus denen die einzelnen Stufen aufgebaut sind, unterschiedliche Anzahlen von Eingängen und Ausgängen auf. Es sind also drei verschiedene Ausführungen von Koppelmatrizen erforderlich. Der Erfindung liegt die Aufgabe zugrunde, eine Koppelanordnung der obengenannten Art anzugeben, bei der die Koppelmatrizen aller Stufen gleich aufgebaut sind. Die Aufgabe wird gelöst, indem u.a. die Koppelmatrizen (G1 ... G16) auf zwei Koppelfelder (KF1, KF2) aufgeteilt sind, daß die Zahl der Eingänge (16) einer Koppelmatrix gleich der Zahl seiner Ausgänge (16) ist und daß die Ein- und Ausgänge (E001 ... E256, A001 ... A256) des ersten Koppelfeldes (KF1) mit den gleichnamigen Ein- bzw. Ausgängen des zweiten Koppelfeldes (KF2) verbunden sind. Die Erfindung befaßt sich noch mit Weiterbildungen, um die Koppelanordnung zur Übertragung von Digitalsignalen mit einer Bitrate von bis zu 150 Mbit/s anwenden zu können.
Abstract:
Devices, systems, and methods for providing point heat detectors based on surface mounted thermistors are described herein. One circuit board for a point heat detector of a fire sensing system includes a circuit board body having number of corners, at least one hole provided in the circuit board body proximate to one of the corners, and a surface mounted thermistor mounted on at least one corner.
Abstract:
A high-frequency signal transmission line includes an element, a linear signal line provided at the element and including a first end and a second end, and at least one ground conductor provided at the element and extending along the signal line. The element includes stacked insulating layers. The ground conductor is positioned opposite to the signal line with the insulating layer positioned therebetween. The ground conductor is a contiguous conductor. The signal line, the ground conductor, and the element generate a characteristic impedance. The signal line includes a first section and a second section. The first section is an uninterrupted section generating a characteristic impedance greater than or equal to a first characteristic impedance at the first end and including the first end. The second section generates a characteristic impedance less than the first characteristic impedance and is adjacent to the first section. The second section is longer than the first section. The signal line is wider in the second section than in the first section.
Abstract:
A wiring structure includes a plurality of wiring patterns. An interval between the adjacent wiring patterns is shortened in the parallel wiring portions. In wiring path change portions, the wiring patterns are extended at a slope with respect to an X direction, and an interval between the adjacent wiring patterns is more widened than the interval. A crosstalk noise can be reduced by widening the interval between the wiring patterns using the wiring path change portions without making an area occupied by a wiring region extremely increased.