Temperature sensor and a method of manufacturing the same

Details Temperature sensor and a method of manufacturing the same Temperature sensor and a method of manufacturing the same

1999-06-03

2001-08-14

Young, Lee (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C338S0220SD, C374S185000, C029S613000, C029S619000

Reexamination Certificate

active

06272735

ABSTRACT:

TECHNICAL FIELD
The present invention is related to a temperature sensor using a thermistor of negative temperature coefficient and a method of manufacturing the same.
BACKGROUND OF THE INVENTION
In order to prevent a thermistor of a temperature sensor from indicating a resistance value that is deviating from the value it should have at a certain temperature, in particular in a high temperature zone, the atmosphere around thermistor has to be kept consistent. A prior art as disclosed by Japanese Patent Laid-Open No. 6-307943 teaches to provide a heat resisting cap housing a thermistor with an air ventilation hole.
However, if the ventilation hole is clogged by some reason, it fails to maintain the ambient of a thermistor consistent. The problem that resistance of a thermistor deviates much from a should-be value still remains unsolved.
DISCLOSURE OF THE INVENTION
The present invention is intended to provide a temperature sensor of stable functioning, through a means for preventing a thermistor from indicating a resistance that is deviating from said should-be value even in a high temperature condition.
The invented temperature sensor comprises a heat resisting cap, a thermistor housed inside the heat resisting cap, and at least one lead wire which is electrically coupled with the thermistor and is taken outside the heat resisting cap. The heat resisting cap is made of an alloy containing Ni—Cr as the main ingredient. The above described structure implements a temperature sensor working stable also in a high temperature condition (e.g. 1000° C. or more), thermistor of which sensor indicating a resistance that is not deviating much from the should-be value, without an air ventilation hole or such other contrivance which was needed in a prior art temperature sensor.


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