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US 5,712,610 AGranted
Protective device
AssigneeSony Chemicals Corp.
InventorsMotohide Takeichi, Norikazu Iwasaki, Yuji Furuuchi
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AssigneeSony Chemicals Corp.
InventorsMotohide Takeichi, Norikazu Iwasaki, Yuji Furuuchi
Estimating the term…
To obtain a protective device that can prevent overvoltage and at the same time has an excellent safety and also to make chip type protective devices smaller in size, this invention provides a protective device comprising a substrate, a heating element provided on the substrate, an insulating layer that covers the surface of the heating element, and a low-melting metal piece provided on the insulating layer. Particularly preferably the substrate and the heating element are each formed of an inorganic material. This protective device may be used in combination with a voltage detecting means making use of a zener diode, in such a way that the heating element of the protective device is electrically excited to generate heat when the voltage detecting means detects a voltage exceeding the rated voltage, whereby an overvoltage protector can be set up.
A protective device comprising a substrate, a heating element provided on the substrate, an insulating layer that covers the surface of the heating element, and a low-melting metal piece provided on the insulating layer,
A protective device comprising a substrate, a heating element provided on the substrate, an insulating layer that covers the surface of the heating element, and a low-melting metal piece provided on the insulating layer
An overcurrent-preventive protective device comprising a substrate, a low-melting metal piece provided on the substrate, an inner sealing portion which is formed of a material having a lower melting point or lower softening point than the low-melting metal piece and seals the low-melting metal piece, and an outside casing that covers the inner sealing portion, leaving a gap between the outside casing and the inner sealing portion.
Dependencies are inferred from the claim text.