Temperature sensing resistance element and thermal flow sensor using same
AssigneeNGK Insulators, Ltd.
InventorsFujio Ishiguro, Zenji Ishikawa
Life of this patent
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Abstract
A temperature sensing resistance element includes a substrate made of an insulating material, a temperature sensing resistor formed on at least a part of the outer peripheral surface of the substrate to connect both ends of the substrate, a cap-shaped conducting member being electrically connected to the temperature sensing resistor and disposed at each end of the substrate, and a protective film covering at least the temperature sensing resistor. A gap is defined by an inner surface an enlarged portion of the conducting member and a part of the outer surface of the substrate, and the gap is widened gradually toward the end of the opening of the conducting member.
Claims10
A temperature sensing resistance element, comprising:
- a substrate formed of an insulating material;
- a temperature sensing resistor formed on at least a part of an outer peripheral surface of said substrate so as to connect both ends of said substrate;
- a cap-shaped conducting member having an enlarged portion formed at a vicinity of an opening thereof and being electrically connected to said temperature sensing resistor and disposed at each end of said substrate, and a protective film covering at least said temperature sensing resistor;
- wherein a gap is defined by an inner surface of said enlarged portion and a part of said outer surface of said substrate, said gap being widened gradually toward an end of said opening of said conducting member.
A thermal flow sensor, comprising a temperature sensing resistance element, said temperature sensing resistance element comprising a substrate formed of an insulating material, a temperature sensing resistor formed on at least a part of an outer peripheral surface of said substrate so as to connect both ends of said substrate, a cap-shaped conducting member having an enlarged portion formed at a vicinity of an opening thereof and being electrically connected to said temperature sensing resistor and disposed at each end of said substrate, a protective film covering at least said temperature sensing resistor, and a gap defined by an inner surface of said enlarged portion and a part of said outer surface of said substrate, said gap being widened gradually toward an end of said opening of said conducting member;
- wherein said temperature sensing resistance element is built into a bridge circuit.
A temperature sensing resistance element, comprising:
- a cylindrical substrate formed of an insulating material;
- a temperature sensing resistor formed on an outer peripheral surface of said substrate and connecting both ends of said substrate;
- a cap-shaped conducting member having an enlarged portion formed at a vicinity of an opening thereof and being electrically connected to said temperature sensing resistor and disposed at each end of said substrate;
- and
- a protective film covering at least said temperature sensing resistor;
- wherein the radius of curvature of both end edges of said substrate is 0.05 mm or more.
A thermal flow sensor, comprising a temperature sensing resistance element, said temperature sensing resistance element comprising a cylindrical substrate formed of an insulating material, a temperature sensing resistor formed on an outer peripheral surface of said substrate for connecting both ends of said substrate, a cap-shaped conducting member having an enlarged portion formed at a vicinity of an opening thereof and being electrically connected to said temperature sensing resistor and disposed at each end of said substrate, and a protective film covering at least said temperature sensing resistor;
- wherein both end edges of said substrate have a radius of curvature of 0.05 mm or more;
- and
- wherein said temperature sensing resistance element is built into a bridge circuit.
Dependencies are inferred from the claim text.