Thermistor
First Claim
1. A thermistor, comprising:
- a thermistor element having first and second opposed end surfaces, and first, second third and fourth peripheral sides;
an insulating glass layer on said first, second third and fourth peripheral sides;
said first and second opposed end surfaces being substantially free of said insulating glass layer;
said insulating glass layer being at least partially crystallized glass;
a terminal electrode on each of said first and second opposed end surfaces; and
said terminal electrode having a baked-on electrode layer in contact with its respective end surface, and at least one plated layer on said baked-on electrode layer.
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Accused Products
Abstract
An insulating glass layer covers the surface of a thermistor element except at the two end surfaces. The insulating glass layer is partially or fully composed of crystallized glass. A terminal electrode is integrally formed on both end surfaces. The terminal electrodes include a baked-on electrode layer formed from a conductive paste. Layers of nickel and tin or lead/tin are plated onto the baked-on electrode. The insulating glass layer enhances shape-maintainability of the insulating glass layer and the baked-on electrodes, provides a smoother glass surface, resulting in a more aesthetically pleasing thermistor, prevents resistance variance due to plating of the baked-on electrodes and provides a strong anti-breaking strength thermistor. The coefficient of thermal expansion of the glass layer is less than the coefficient of thermal expansion of the thermistor element. This difference in coefficients of thermal expansion tends to help the thermistor element resist stress breakage.
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Citations
20 Claims
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1. A thermistor, comprising:
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a thermistor element having first and second opposed end surfaces, and first, second third and fourth peripheral sides; an insulating glass layer on said first, second third and fourth peripheral sides; said first and second opposed end surfaces being substantially free of said insulating glass layer; said insulating glass layer being at least partially crystallized glass; a terminal electrode on each of said first and second opposed end surfaces; and said terminal electrode having a baked-on electrode layer in contact with its respective end surface, and at least one plated layer on said baked-on electrode layer. - View Dependent Claims (2, 3, 4, 5, 8, 9, 10, 11, 12)
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6. A thermistor, comprising:
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a thermistor element having first and second opposed end surfaces, and first, second third and fourth peripheral sides; an insulating glass layer on said first, second third and fourth peripheral sides; said first and second opposed end surfaces being substantially free of said insulating glass layer; said insulating glass layer being at least partially crystallized glass; a terminal electrode on each of said first and second opposed end surfaces; and said crystallized glass has a thermal expansion coefficient of from about 40 to about 100% of a thermal expansion coefficient of said thermistor element. - View Dependent Claims (7, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification