Abstract:
A semi-rigid heated element assembly and method of manufacturing semi-rigid heated element assemblies is provided. A heated element assembly includes a first thermoplastic sheet (105), a second thermoplastic sheet (110), and a resistance heating element (400) laminated between the first and second thermoplastic sheets. The resistance heating element (400) includes a supporting substrate (405) having a first surface thereon and an electrical resistance heating material (410) forming a predetermined circuit path (415) having a pair of terminal end portions (412). The circuit path (415) continues onto at least one flap portion (420) that is capable of rotating about a first axis of rotation (425). The reformable continuous element structure (500) may be formed into a final element assembly configuration (600) whereby at least the flap portion (420) is rotated along its axis of rotation (425) to provide resistance heating in at least two planes.
Abstract:
The invention relates to methods for producing passive components on a substrate. Said methods permit, with a low level of complexity and with good results, the production of different components, especially high-impedance and low-impedance resistor elements and/or capacitor elements having a high and some having a low capacitance per unit length on the substrate. Lift-off processes can, to a large extent, be forgone particularly in the case of critical structurings, and the components can be dry-chemically and/or wet-chemically etched in a selective manner.
Abstract:
An electronic device and process of making the device is disclosed. The device includes a multi-sided body defined by a plurality of electrode plates arranged in a stack. A resin layer is applied to both conductive and semiconductive regions of the device, and metal is plated upon terminals to create a conductive element. The device may be a varistor, themistor, resistor, or other microelectronic component having a multi-sided body and terminal structures that are capable of receiving a resin coating. The multi-sided body has a resin coating on at least a portion of an exterior surface, the resin coating substantially preventing plating of metal onto the exterior surface of the body. One suitable resin coating that may be employed is a thermoset resin comprising a B-staged divinylsiloxane-bis(benzocyclobutene)(i.e. "BCB") resin dissolved in mesitylene solvent.
Abstract:
A process for manufacturing a composite polymeric circuit protection device in which a polymeric assembly is provided and is then subdivided into individual devices (2). The assembly is made by providing first and second laminates (7, 8), each of which includes a laminar polymer element having at least one conductive surface, providing a pattern on at least one of the conductive surfaces on one laminate, securing the laminates in a stack (1), in a desired configuration, at least one conductive surface of at least one of the laminates forming an external conductive surface (3) of the stack, and making a plurality of electrical connections (31, 51) between a conductive surface of the first laminate and a conductive surface of the second laminate. The laminar polymer elements may be PTC conductive polymer compositions, so that the individual devices made by the process exhibit PTC behavior.
Abstract:
Electronic devices prepared from nanoscale powders are described. Methods for utilizing nanoscale powders and related nanotechnology to prepare capacitors, inductors, resistors, thermistors, varistors, filters, arrays, interconnects, optical components, batteries, fuel cells, sensors and other products are discussed.
Abstract:
Electrical devices, particularly circuit protection devices, contain conductive polymer elements whose edges are formed by breaking the conductive polymer element, along a desired path, without the introduction of any solid body into the element. The resulting cohesive failure of the conductive polymer produces a distinctive fractured surface. One method of preparing such devices involves etching fracture channels in the electrodes of a plaque containing a PTC conductive polymer element sandwiched between metal foil electrodes, and then snapping the plaque along the fracture channels to form individual devices. The figure illustrates a circuit protection device made in this way.
Abstract:
The invention relates to a process for tuning a magneto-resistive sensor by means of which an offset error can be compensated without additional components. To this end, a uniform, directed magnetic field is applied to the magneto-resistive sensor (10), a given control current (I) is applied to its current contacts (22, 24) and during the measurement of a pseudo-Hall voltage, at least one of the voltage contacts (30, 32) is grooved, e.g. with a laser beam (38).
Abstract:
A varistor comprises a primary varistor metal oxide, aluminum in an amount of about 1 to about 30 parts per million (ppm), about 0.1 to about 0.5 mole % bismuth, about 0.1 to about 1.5 mole % antimony, about 0.1 to about 1 mole % chromium, about 0.1 to about 1.0 mole % manganese, about 0.1 to about 2.0 mole % cobalt, and about 0 to about 1.0 mole % boron. Each of these elements is present in the form of its oxide and the varistor has a DC leakage current at 80 % of V1ma/cm2 of less than 1.0 x 10?-7 amp/cm2¿.
Abstract:
A resistor (2) assembly and method of assembling a resistor (2) to a coupling (40), comprises providing a resistor having a first end (4) and a second end (6), the resistor being tubular in shape and providing a coupling housing (10) having an open end (30) for receiving the first end of the resistor, the coupling housing (10) including a sealing member (42), a retainer (44), and a support washer (45). The retainer (44) is interposed between the support washer (45) and sealing member (42). The first end (4) of the resistor is inserted into the open end (30) of the coupling housing (10). The tube is rotated within the coupling housing (10) so that the resistor is in sealing engagement with the sealing member (42) and retained by retaining member.