A resistance assembly for a mobile device and a manufacturing method thereof are disclosed. The resistance assembly for a mobile device in accordance with an aspect of the present invention includes: a substrate having a circuit formed thereon; first to fourth pads laminated and separated from one another on the substrate; first to fourth terminals connected to the first to fourth pads, respectively, by being formed in a longitudinal direction along edges of lateral surfaces of a resistance body that are opposite to each other; and first and second resistors formed in between the first to fourth terminals along the opposite lateral and connected in parallel to each other on the resistance body and configured to adjust electric current flowed into the circuit.

The invention is to provide a resistor trimming method capable of adjusting a resistance value with ultrahigh precision and having excellent production efficiency. To achieve the object, a start point (S1) at a distance from a resistor (4) is irradiated with laser light while probes are brought into contact with a pair of surface electrodes (3) to measure a resistance value of the resistor (4). The place irradiated with the laser light is scanned so that a first trimming groove (5) extending in a direction perpendicular to a current direction can be formed in the resistor (4). Then, the place irradiated with the laser light is returned by a predetermined amount from an end point (first turning point (T1)) of the first trimming groove (5) to be set as a second turning point (T2). With the second turning point (T2) as a start point, scanning and cutting is performed to forma second trimming groove (6). Thus, the resistance value of the resistor (4) is adjusted to a target resistance value with high precision.

A chip resistor including, a substrate having a main surface, a first resistance circuit formed at the main surface of the substrate, a second resistance circuit formed at the main surface of the substrate apart from the first resistance circuit, a common internal electrode formed at the main surface of the substrate and electrically connected to the first resistance circuit and the second resistance circuit, a first internal electrode formed at the main surface of the substrate and electrically connected to the first resistance circuit, a second internal electrode formed at the main surface of the substrate and electrically connected to the second resistance circuit, and a dummy resistance circuit formed in a region between the first resistance circuit and the second resistance circuit at the main surface of the substrate so as to be in an electrically floating state.

In certain embodiments, a method comprises ablating, by a laser set to a first power level, a first area of a polyimide base substrate and forming, by ablating the first area of the polyimide base substrate, a first carbonaceous material film comprising a first specific resistive value. The method further comprises ablating, by the laser set to a second power level, a second area of the polyimide base substrate and forming, by ablating the second area of the polyimide base substrate, a second carbonaceous material film comprising a second specific resistive value. A tapered resistive material is produced by forming the first carbonaceous material film comprising the first specific resistive value and the second carbonaceous material film comprising the second specific resistive value.

A method for manufacturing a sheet of positive temperature coefficient (PTC) material includes providing a PTC material, grinding the PTC material into a powder, and inserting the ground PTC material into a press. The ground PTC material is compressed within the press until the PTC material defines a planar shape. The PTC material is then removed from the press to thereby provide a PTC sheet.

A method for manufacturing a sheet of positive temperature coefficient (PTC) material includes providing a PTC material, grinding the PTC material into a powder, and inserting the ground PTC material into a press. The ground PTC material is compressed within the press until the PTC material defines a planar shape. The PTC material is then removed from the press to thereby provide a PTC sheet.

An electrical component for embedding into a carrier comprises a ceramic main body, an electrically insulating passivation layer which is applied to the main body, and at least one inner electrode. In addition, the electrical component comprises an outer electrode which is connected to the inner electrode, wherein the outer electrode comprises a first electrode layer comprising a metal and a second electrode layer which is arranged on the latter and comprises copper.

An electrical component for embedding into a carrier comprises a ceramic main body, an electrically insulating passivation layer which is applied to the main body, and at least one inner electrode. In addition, the electrical component comprises an outer electrode which is connected to the inner electrode, wherein the outer electrode comprises a first electrode layer comprising a metal and a second electrode layer which is arranged on the latter and comprises copper.

The invention relates to a composite material strip for producing an electric component, in particular a resistor, in particular a low-resistance current-measuring resistor, comprising a first material strip (4) made of a copper-containing material, in particular a copper-containing conductor material, for later forming a first connection part of the electric component and comprising a second material strip (3) for later forming a second connection part of the electric component. The first material strip (4) and the second material strip (3) are electrically and mechanically connected together along a longitudinal seam, wherein the second material strip (3) consists of an aluminum-containing material, in particular an aluminum-containing conductor material. The invention further relates to a corresponding production method and to a corresponding component.

The invention relates to a composite material strip for producing an electric component, in particular a resistor, in particular a low-resistance current-measuring resistor, comprising a first material strip (4) made of a copper-containing material, in particular a copper-containing conductor material, for later forming a first connection part of the electric component and comprising a second material strip (3) for later forming a second connection part of the electric component. The first material strip (4) and the second material strip (3) are electrically and mechanically connected together along a longitudinal seam, wherein the second material strip (3) consists of an aluminum-containing material, in particular an aluminum-containing conductor material. The invention further relates to a corresponding production method and to a corresponding component.