PURPOSE: To enable a varistor to effectively absorb both surges having sharp rising and large surges, by a structure wherein a first non-linear resistor whose basic constituent is ZnO and a second non-linear resistor whose basic constituent is SrTiO3 are connected in parallel one another.
CONSTITUTION: A varistor 10 includes a multilayer sintering body 12. This multilayer sintering body 12 comprises pairs of a first non-linear resistor 14 whose basic constituent is ZnO and a second non-linear resistor 16 laminated thereon whose basic constituent is SrTiO3. Further, inner electrodes 18a, 18b and 18c are formed between the first non-linear resistors 14 and the second non-linear resistors 16, respectively. And further, outer electrodes 20a and 20b are formed on one edge section and the other edge section opposite thereto of the multilayer sintering body 12, respectively. The varistor has a circuit structure in which the first non-linear resistor 14 and each the second non-linear resistor 16 are connected in parallel one another. Therefore, in the varistor 10, a sharply rising surge can be absorbed by the second non-linear resistors 16, and moreover a discharge voltage can be controlled to a lower voltage by the first non-linear resistors 14.
ABE YOSHIO
KAWASE MASAHIKO
TAIRA HIROAKI
Next Patent: RARE EARTH PERMANENT MAGNET AND PREPARATION THEREOF