Surface mountable laminated circuit protection device
AssigneeProtectronics Technology Corporation
InventorsChien-Shan Huang, Rei-Yian Chen, Chih-Yi Chang
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Abstract
The invention discloses a surface mountable laminated circuit protection device by using a conductive composite material with PTC characteristics. The design of the invention enables the combinational arrangements of a top electrode, a bottom electrode and an insulating material between electrodes without using a conductive mechanism between the top electrode and the bottom electrodes to make a surface mountable polymeric circuit protection device, and can use the current double-layer metal-foil clad substrate as a processing substrate, make the processing of the protection device easier, and have better structural strength and dimension stability.
Claims19
A surface mountable laminated circuit protection device, comprising:
- a first portion of a first conductive electrode and a second portion of a first conductive electrode, the first portion of the first conductive electrode and the second portion of the first conductive electrode being separated by a first isolation trench;
- a conductive first composite material component with a PTC characteristics provided above the first portion of the first conductive electrode and the second portion of the first conductive electrode, the thickness of the conductive first composite material component with the PTC characteristics being less than the width of the first isolation trench;
- and
- a first conductive layer provided above the conductive first composite material component with the PTC characteristics such that most currents flow from the first portion of the first conductive electrode to the first conductive layer through the conductive first composite material component with the PTC characteristics, then to the second portion of the first conductive electrode through the conductive first composite material component with the PTC characteristics.
A circuit protection device, comprising:
- a conductive first composite material component with a PTC characteristics,
- a first electrode and a second electrode being separated;
- provided below the first composite material component, and the smallest distance between the first electrode and the second electrode being larger than the thickness of the first composite material component;
- and
- a first conductive layer provided above the first composite material component, and the distance between the first electrode and the first conductive layer and the distance between the second electrode and the first conductive layer both being smaller than the smallest distance between the first electrode and the second electrode.
Dependencies are inferred from the claim text.