Abstract:
A signal transmission structure for connecting a coaxial cable connector is provided. The coaxial cable connector has a signal pin. The signal transmission structure includes a reference plane and a conductive layer, and the conductive layer is located on one side of the reference plane. Moreover, the conductive layer includes a signal perforated pad, a first line segment, a second line segment, and a compensation pad. The signal pin is suitable for threading the signal perforated pad. The first line segment is connected to the signal perforated pad, and the compensation pad is connected between the first line segment and the second line segment.
Abstract:
Provided are a circuit board with enhanced moisture resist and the method of manufacturing the circuit board, and a circuit device and a method of manufacturing the circuit device. A circuit board of the present invention includes: a substrate; wirings formed on the main surface of the substrate; a cover layer covering the wirings excluding the regions to be connectors; back electrodes formed on the bottom surface of the substrate; and through-hole electrodes formed so as to penetrate the substrate, and thereby connecting the wirings and the back electrodes. On surfaces of each of the wirings in this circuit board, convex portions on the periphery of the substrate are set larger in width than convex portions in a center portion of the substrate. With this configuration, adhesion reliability between the wirings and the cover layer under a thermal cycle load can be enhanced.
Abstract:
An exemplary flexible printed circuit board (2) includes a wiring layer (21). The wiring layer includes a number of conductive lines (211). Each of the conductive lines includes a finger (213), a line portion (212) and a junction portion (214) between the finger and the line portion. A width of the finger is greater than a width of the line portion, a width of the junction portion gradually changes from the width of the line portion to the width of the finger. The flexible printed circuit board has high reliability.
Abstract:
A method of processing a circuit board including providing a circuit board having disposed thereon a conductive pattern, the pattern comprising a trace terminating at a terminal and depositing conductive material on the terminal and trace to form a land extending away from the terminal on the trace past a projection line. The method also includes applying a soldermask to the circuit board to form a soldermask opening having an opening edge located at and aligned with the projection line, with the opening framing the terminal and a first portion of the land, and to cover a second portion of the land.
Abstract:
A method for connecting FPC to a second circuit board, comprising the steps of (i) preparing a flexible printed circuit board (FPC) and a second circuit board, (ii) disposing the connection parts of the FPC to face the connection parts of the second circuit board such that a thermosetting adhesive film is present between the connection parts of the FPC and the connection parts of the second circuit board, and (iii) applying heat and pressure sufficiently high to thoroughly push away the adhesive film for establishing electrical contact and allow for curing of the adhesive, wherein the ratio of conductor width (L)/conductor-to-conductor distance (S) in the conductor wiring end parts constituting the connection parts of FPC is 0.5 or less and the thermosetting adhesive film is adjusted to have a viscosity of 500 to 20,000 Pa·s at 200° C.
Abstract:
Printed circuit board in which deterioration of signal transmission characteristics otherwise caused by a stub parasitically formed in a through-hole is suppressed to provide optimum high-speed signal transmission characteristics. A printed circuit board 10 includes a power supply/ground layer 11 and a signal line 12b in a dielectric layer 13, and a through-hole 12 connected to the signal line 12b. A clearance 14 which becomes an anti-pad is provided in an area between the through-hole 12 and the power supply/ground layer 11. The signal line 12b is extended from the through-hole 12 through the clearance 14 to an area below the power supply/ground layer 11. The portion of the signal line 12b arranged in the vicinity of the power supply/ground layer 11 in the clearance 14 has an area of impedance gradient 17 whose characteristic impedance becomes progressively lower in a direction away from the through-hole 12.
Abstract:
An information handling system including a system fan control is disclosed. The information handling system can include a power trace operable to produce a temperature differential in response to a current change within the reduced trace width region. A thermistor may be provided in close proximity to the reduced trace width region and can be operable to detect the temperature differential provided in response to the current change. A printed circuit board for use in an information handling system and a method of using the information handling system are also disclosed.
Abstract:
Various embodiments include a method of forming an interconnect comprising forming at least two vias in a substrate, forming a conductive pad on a surface of the substrate, forming at least one tapered conductive segment on the surface of the substrate coupled to the conductive pad, wherein only a first via of the at least two vias is formed substantially beneath the conductive pad and is coupled to the conductive pad, a second via of the at least two vias is coupled to the conductive pad by a first one of the at least one tapered conductive segments, the first one of the tapered conductive segments having a first end having a first width and a second end having a second width, the first end being connected to the second via and the second end being connected to the conductive pad, the first width being less than the second width.
Abstract:
A surface mounting structure for a surface mounting electronic component comprises an electronic component a land, a wiring, and an electrical connection pattern. The electronic component has electrodes at opposite ends thereof. The land is connected to each electrode through a solder. The wiring is connected to the land and has a width which is smaller than a width of the electronic component in a width direction thereof. The wiring is connected to the electrical connection pattern. The electrical connection pattern has on a side on which the wiring is connected to the electrical connection pattern a width which is larger than the width of the electronic component in the width direction thereof.
Abstract:
A tap tape of a tape carrier package prevents connection parts from being eroded. The tap tape includes a base film having a device hole formed to mount a driver chip for driving a panel of a flat panel display, input patterns positioned on the base film and having a plurality of electrode pads connected to a side of the device hole, output patterns positioned on the base film and having a plurality of electrode pads connected to the other side of the device hole; and connection parts positioned at the ends of the input patterns or the output patterns and having electrode pads of widths different from widths of the electrode pads.