Abstract: Electric heater assembly for use typically with hand-held soldering or desoldering devices includes an elongated resistance element formed from a thin flat metal foil having three connected areas of different resistance, the differing resistance being caused by the different widths of the areas. The first area, to which terminals are attached, is the widest and acts as a heat sink. The second area decreases in width to the first area and acts as a transition area between the first and third areas. The first and second areas include first and second separated portions for providing electrical current to the first area and returning it therefrom. The first area includes first and second strips respectively connected to the first and second portions of the second area. The strips extend adjacent a first side edge of the third area in a side-by-side relationship to the distal end of the resistance element and then back towards the second area to a position where they are connected to one another.

Abstract: A resistance element capable of withstanding a high voltage is formed through impurity diffusion in a single crystal island of a semiconductor integrated circuit substrate. The resistance element includes a resistive region formed in an exposed surface of the single crystal island and folded reciprocatively by at least one and a half turns in a planar zigzag-like pattern. The pitch at which the resistive region is folded is decreased as viewed in the direction in which extension of depletion layer formed within the single crystal island upon application of a voltage between two ends of the resistive region is decreased.

Abstract: A heating cord comprises bendable electric heating wire and nonconductive fiber. A net type heater is formed from the heating cords. Common power source terminals comprising a plurality of bendable conductors are fixed at both sides of the net type heater and are connected to the electric heating wire thereof.

Abstract: The electrical resistor of the present invention comprises a flat metal plate having a thickness from 1 mil to 50 mils. A pair of electrical leads are operatively attached to the ends of the metal plate, and the side edges of the metal plate are provided with a plurality of notches extending inwardly in spaced apart relation to one another, with slots of one of the sides of the plate being staggered with respect to the slots of the other side of the plate. Each of the slots extend completely through the thickness of the plate and are formed by a laser beam cut which anneals the metal of the plate and imparts stability to the electrical characteristics of the metal plate. Once formed, the metal plate may be bent into different shapes to achieve the desired geometric configuration. Furthermore, the plate can be embedded in molded material so as to provide a protective covering for the plate.

Abstract: An electric hotplate has a hotplate body in the form of a thin ceramic substrate, to whose bottom surface is applied, e.g. by printing, a thin resistive material film. This resistive material film is covered by a protective coating, which prevents damage. Between the protective coating and the bottom tray of the hotplate is provided a thermal insulating layer. The hotplate has an extremely low thermal capacity, so that rapid preliminary cooking or boiling is possible with low power consumption.

Abstract: A processor apparatus is provided in which a blackbody radiator having a constant planar energy flux characteristic is placed in opposition to semiconductor material. The blackbody source produces a constant planar energy flux to uniformly heat the material. The source is heated to a sufficiently high temperature for a sufficient time to anneal or activate a semiconductor wafer or to epitaxially regrow a thin epitaxial film. The processor is operated by accomplishing the steps of presenting a blackbody radiator in opposition to semiconductor material to be thermally treated, radiatively heating the material to a sufficiently high temperature for a sufficient time to accomplish the desired process result, and cooling and removing the material. In the interval between presentation of successive samples of the material to the source, the source may be shuttered or idled to reduce energy consumption.

Abstract: The electrical resistor of the present invention comprises a flat metal plate having a thickness from 8 mils to 50 mils. A pair of electrical leads are operatively attached to the ends of the metal plate, and the side edges of the metal plate are provided with a plurality of notches extending inwardly in spaced apart relation to one another, with slots of one of the sides of the plate being staggered with respect to the slots of the other side of the plate. Each of the slots extend completely through the thickness of the plate and are formed by a laser beam cut which anneals the metal of the plate and imparts stability to the electrical characteristics of the metal plate. Once formed, the metal plate may be bent into different shapes to achieve the desired geometric configuration. Furthermore, the plate can be imbedded in molded material so as to provide a protective covering for the plate.

Abstract: This heating body is cut from a metal sheet (1) and defined by slots (2) obtained by punch stamping on a support (4) of plastics foam. The opposite edges of these slots (2) are spaced from one another by deformation of the portion of the conductor (7) adjacent to these slots, obtained by the bevelled shape of the portion of the cutter (3) defining the cutting edge and by the compressibility of the material forming the support (4). According to the method of manufacturing this heating body, its external profile and the slots (2) are obtained by a same single punching operation.

Abstract: An electrical heating element material of a sheet form is provided, which is comprised of a web of a synthetic resin having a plurality of metal conductor wires arranged therein in parallel to one another along the longitudinal direction of the web. The web is folded in succession at predetermined intervals along folding lines inclined at a small acute angle to the transverse direction of the web to form a substantially two-layer parallelogrammatic sheet. Considering the small angle, the sheet is, for practical purposes, rectangular.

Abstract: Laminated heating elements are provided which are suitable for joining synthetic resinous thermoplastic bodies particularly thermoplastic foams. The heating elements are of laminar structure having at least two oppositely disposed heating elements which electrically may be fed in parallel. A significant improvement in rigidity and resistance to mechanical abuse is achieved.

Abstract: In an electrical resistance heating element (1) comprising a heating conductor support (3) of insulating material and a heating conductor (4) of resistance wire wound in meander or sinuously coiled manner with loop ends or bights (6) and loop legs or runs (8), the loops of the heating conductor (4) being arranged substantially in a single plane, and the inner loop ends (6) which are directed towards the heating conductor support (3) being situated in the edge region of the heating conductor support (3), it is proposed according to the invention to construct the heating conductor support (3) as a flat plate, the flat plate to be situated substantially in the same plane as the loops of the heating conductor (4). It is also proposed that the outer loop ends or bights (5) remote from the heating conductor support (3) are to be self-supporting and not secured.

Abstract: A variable resistor has an insulating substrate plate, a resistance body formed on the substrate plate and a slider adapted to slide along the resistance body. The resistance body is formed in a winding pattern to provide a larger range of variation of resistance for a given stroke of the slider. The slider has a plurality of contacts adapted for sliding along the resistance body so that at least one of the contacts is kept in contact with the winding resistance body so as to provide a linear change of the output of the resistor.

Abstract: A resistance element for obtaining a continuous and linear output characteristic is obtained by the combination of a zig-zag resistance element and a resistance film of higher resistivity disposed thereover.

Abstract: The present device is a high reliability resistor comprising a sheet of metal foil secured to the flat side of a substrate and with the opposite side of the substrate formed to dissipate heat into the ambient thus enabling the present resistor to have an improved temperature coefficient of resistance (TCR) and further enabling the resistor to function satisfactorily in a high wattage mode.

Abstract: A panel heater with a flat metal sheet of substantially even thickness of from 0.06 to 0.2 mm and having a mesh-like radiation section formed in the central portion of the sheet, the mesh-like radiation section being composed of a plurality of units of wave-like current passageways of uniform width of approximately 2 mm from one end to the other, arranged parallel to each other and connected to each other at the crests of the wave-like current passageways so that the combined width of the passageways at the crests is twice the uniform width. The panel heater also has a pair of heat resistant boards between which the metal sheet is sandwiched; and a frame assembly joining together the heat resistant boards.