Resistor and manufacturing method
AssigneeKoa Corporation
InventorHiroyuki Fukao
Life of this patent
Estimating the term…
Abstract
There is provided a resistor in which a first resistive part of a resistive element that electrically conducts between a pair of electrodes formed on either end of an insulating substrate has a meandering pattern meandering on the substrate surface and a swelling pattern that has a form in which a part of the meandering pattern swells out from the stroke width of the meandering pattern, a second resistive part that is electrically connected in series to the first resistive part is shorter than the entire length of the first resistive part, and has a wider width than the stroke width of the meandering pattern, and a trimming groove is formed in at least either the swelling pattern or the second resistive part. This can improve resistance accuracy and provide a high voltage resistor with high withstand voltage property.
Claims6
A resistor, comprising a resistive element electrically conducting between a pair of electrodes formed on an insulating substrate, wherein said resistive element comprises:
- a first resistive part having a meandering pattern and a swelling pattern that is connected to the meandering pattern and has a form in which a part of the meandering pattern swells out from a stroke width of the meandering pattern;
- and
- a second resistive part that is shorter than an entire length of the first resistive part, has a wider width than the stroke width of the meandering pattern, and is electrically connected in series to the first resistive part, wherein a trimming groove is at least formed in one of the swelling pattern and the second resistive part;
- said resistor further comprising:
- an intermediate electrode connecting the first resistive part and the second resistive part;
- and
- a protective film formed to cover the first resistive part, the second resistive part and the intermediate electrode;
- and
- wherein the protective film prevents the intermediate electrode from being externally conducted.
A manufacturing method for a resistor having a resistive element electrically conducting between a pair of electrodes formed on an insulating substrate, said manufacturing method comprising:
- forming a first resistive part having a meandering pattern and a swelling pattern that is connected to the meandering pattern and has a form in which a part of the meandering pattern swells out from a stroke width of the meandering pattern, and a second resistive part that is shorter than an entire length of the first resistive part, has a wider width than the stroke width of the meandering pattern, and is electrically connected in series to the first resistive part via an intermediate electrode;
- removing a part of the swelling pattern for adjusting resistance so as to elongate a passage of an electric current of the first resistive part;
- narrowing a width of a predetermined region of the second resistive part for adjusting resistance, wherein a width of a remaining part of the predetermined region of the second resistive part where a trimming groove is formed is equal to or greater than the stroke width of the meandering pattern;
- and
- forming a protective film to cover the first resistive part, the second resistive part and the intermediate electrode, where the protective film prevents the intermediate electrode from being externally conducted.
Dependencies are inferred from the claim text.