Platinum temperature sensor element

Patent metadata

Field	Value
Publication number	US-10488270-B2
Application number	US-201715784695-A
Country	US
Kind code	B2
Filing date	Oct 16, 2017
Priority date	Oct 17, 2016
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

A temperature sensor element has such a structure as, when reinforcing lead wires on internal electrodes with a paste, one side surface of each of the lead wires is covered with a reinforcement paste and the other side surface is not covered with the reinforcement paste without covering the entire lead wires welded and connected to the internal electrodes. This allows elimination of cause of cracks generating, thereby securing sufficient joining strength and reinforcement of conductivity of the internal electrodes and the lead wires, and securing connection strength between the lead wires and the internal electrodes.

First claim

What is claimed:

1. A platinum temperature sensor element comprising:
an insulating substrate having a planar rectangular shape made of an insulating material with a predetermined thickness;
a pattern made of a platinum resistance film formed on the insulating substrate;
a pair of electrodes formed on either end along a length of the insulating substrate;
lead wires that are joined to the respective paired electrodes and extend to an outside of the platinum temperature sensor element; and
a protective film that is formed on a top side of the insulating substrate to cover the pattern, the paired electrodes, and top surfaces of joined regions of the lead wires to the paired electrodes;

wherein:
lower surfaces of ends of the lead wires are connected to a top surface of the electrodes, and one side surface of each of the lead wires and top surfaces of the pair of electrodes on the same side as the one side surfaces are only partially covered with a reinforcement paste on the joined regions; and
each of multiple regions on the one side surface of each of the lead wires on the joined regions, or each of multiple regions on the one side surface and the other side surface of each of the lead wires on the joined regions are covered separately with the reinforcement paste.

2. The platinum temperature sensor element of claim 1 , wherein a concave part for housing the lead wires is formed on each of the pair of electrodes.

3. The platinum temperature sensor element of claim 1 , wherein the pair of electrodes, a surface protective material for the lead wires, and the reinforcement paste are made of a common precious metal material.

4. The platinum temperature sensor element of claim 3 , wherein the precious metal material includes at least platinum.

Assignees

• Koa Corp

Inventors

• Suzuki Ryusuke
• Ashikawa Takumi
• Miura Katsuya

Classifications

• H01C1/1406

  Terminals or electrodes formed on resistive elements having positive temperature coefficient · CPC title

• H01C7/021

  formed with two or more layers · CPC title

• G01K7/18 Primary

  the element being a linear resistance, e.g. platinum resistance thermometer (G01K7/26 takes precedence) · CPC title

• G01K7/183 Primary

  characterised by the use of the resistive element · CPC title

• H01C7/22

  Elongated resistive element being bent or curved, e.g. sinusoidal, helical · CPC title