Abstract:
In one aspect, a surface mount contact is provided for attachment to a circuit board or the like. The contact includes an elongated electrically conductive pin that has a first end and an opposing second end. A pre-formed heat re-flowable material is attached to one end of the pin and a conductive locator member surrounds the pin at a location between the first and second ends thereof and adjacent the conductive locator member. In one embodiment, the locator member is in the form of a cylindrical collar that extends around the pin.
Abstract:
A method for surface mount solder of a comparatively large component is provided wherein a first intermediate component is soldered to a printed wring board and a larger second component is positioned and soldered to the printed wiring board using the intermediate component. An electrical contact made this way is covered as well as its use in an electrostatographic printer.
Abstract:
In order to make contact from heavy-current connecting elements of a component, in particular a relay, to connecting conductors of an insulating mount (1), the blade terminals of the component, in the form of connecting tongues (10) are welded to bent connecting tabs (12) of the connecting conductors (13), which are embedded in a mount, for example a printed circuit board. In order to protect the plastic located in the vicinity against damage from the welding energy, the end sections of the connecting tabs (12) and of the connecting tongues (10) are provided with a tooth contour, such that the individual teeth (16, 17) are welded successively. Having a reduced area with which to conduct the current, the teeth reach a high thermal load. In consequence, the teeth rapidly reach the melted phase, without the adjacent plastic being caused to melt via the heat conduction in the short welding time.
Abstract:
A surface-mounted multilayer capacitor and a printed circuit board having such a capacitor. The capacitor comprises a multilayer of electrodes and dielectric layers which are alternately stacked. End contacts of the electrodes consist of a thin sprayed-metal layer and a U-shaped cap which engages the capacitor in a clamping manner. The sprayed-metal layer and the cap can contact each other electrically via a solder layer. Preferably, the sprayed-metal layer is impregnated with a thermocuring synthetic resin and the synthetic resin is removed from a part of the sprayed-metal layer. The capacitor preferably comprises coating layers which are cemented to the multilayer by means of an adhesive layer.
Abstract:
The present image sensor mounting system is particularly adapted to the mounting of a linear sensor array, of the type having a transparent window on a front surface and a thermal and electrically conductive back surface. The system provides superior electrical and thermal transfer characteristics. A heat sink having at least one flat surface is positioned to make thermal contact with the back surface of the image sensor. A multilayer circuit board having layers of conductive material separated by layers of insulating material and having an opening therethrough sufficient in size to accept the heat sink provides the system support. A metal plating extends from one surface of the board through the opening in the board to the opposite surface of the board with selected ones of the layers of conductive material making electrical contact with the metal plating. The heat sink is mounted in the multilayer circuit board opening in thermal and electrical contact with the metal plating. A layer of thermal and electrically conductive grease is layered between the at least one surface of the heat sink and the conductive back surface of the linear sensor array.
Abstract:
A surface mountable electronic device and method of making same wherein a discrete electronic device is encapsulated in a body of electrical insulating material having opposite ends and mounting surface extending between the ends, and an electrode is provided on each end. Each electrode includes a portion on the end of the body in electrical contact with the corresponding lead of the discrete electronic device and a contact portion extending along the mounting surface for making electrical connection to a circuit portion defined on a surface to which the device is mountable. The discrete electronic device is manufactured, prior to encapsulation, by known techniques. Preferably the body is a rectangular solid with each of the four sides having electrode contact portions thereon to serve as one of four possible mounting surfaces each with substantial mechanical stability. When the discrete electronic device is an inductor, interruption of the magnetic field is minimized by spacing the ends of the inductor core from the ends of the encapsulating body, separating the electrode contact portions, having the area of the electrode end portion less than the area of the end of the encapsulating body, and having the cross-sectional area of the most narrow section of the electrode end portion no less than the cross sectional area of the magnetic wire of the inducator winding. In the case of a shielded inductor, phenolic core inductor or non-inductive device, electrodes or diode, solid metal electrode can be employed.
Abstract:
Component mounting system for metallic printed circuit boards having insulating coatings on their surfaces is disclosed in which the drilled hole in the metallic board is lined with a thin walled liner of plastic tubing. A metallic receptacle is positioned in the liner so that the liner electrically insulates the receptacle from the metallic portion of the printed circuit board. The lead wire from the component is inserted into the receptacle and the board is solder-dipped to electrically connect the lead wire to a connecting path on the board. The heat from the soldering operation causes the liner to radially expand so that it achieves a tight fit in the hole. The board acts as a heat sink for the components mounted thereon but the board is electrically isolated from the components excepting where it is used as a grounding plane.