Temperature sensitive element and temperature sensor
AssigneeNgk Spark Plug Co., Ltd.
InventorsSeiji OYA, Toshiya OYA
Life of this patent
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Abstract
A temperature sensitive element in a temperature sensor includes a covering member formed from alumina and aluminosilicate glass, and the volume ratio of the alumina to the aluminosilicate glass (the alumina/the aluminosilicate glass) in the covering member is 30 vol %/70 vol %. The aluminosilicate glass contained in the covering member is high heat-resistant glass having a softening point of 900° C. or higher. The covering member can hold output lines and pads and can restrain separation of the output lines from the pads and separation of the pads from a ceramic substrate even in an environment of higher temperature as compared with the case where the covering member is formed of the aluminosilicate glass only.
Claims5
A temperature sensitive element comprising:
- a ceramic substrate;
- a metallic resistor layer formed on the ceramic substrate;
- a pad formed on the ceramic substrate, the pad having electric conductivity and being electrically connected to the metallic resistor layer;
- an output line formed of a metal and joined to a surface of the pad;
- and
- a covering member that is disposed on the pad so as to cover at least a portion of the output line, the portion being located on the pad, wherein:
- the covering member is formed of a mixture of a glass and a ceramic,
- a volume ratio of the ceramic to the glass (the ceramic/the glass) in the covering member is within a range of 3 vol %/97 vol % to 50 vol %/50 vol %, and
- a softening point or a melting point of the glass is 900° C. or higher.
Dependencies are inferred from the claim text.