A terminal connecting structure is provided with each of the electrodes provided on the element forming the electronic component; and the terminals respectively having the connecting portions arranged along the electrodes respectively. In addition, the terminal connecting structure is provided with clearance forming portions configured to respectively form the respective clearances between the electrodes and the connecting portions respectively; and the connecting materials respectively provided in the clearances, the connecting material being configured to electrically connect the connecting portions and the electrodes respectively.

An object is to provide a laminated varistor excellent in clamping voltage ratio. Laminated varistor includes at least a pair of internal electrodes provided in varistor layer containing ZnO as a main component.

Internal electrode contains Ag as a main component and is made of a metal containing at least one type selected from Pt and Au. The total weight of Pt and Au with respect to the weight of the metal constituting internal electrode is set between 2% and 30% (inclusive). With such a configuration, diffusion of Ag into varistor layer can be prevented, and a laminated varistor excellent in clamping voltage ratio can be obtained.

An object is to provide a laminated varistor excellent in clamping voltage ratio. Laminated varistor includes at least a pair of internal electrodes provided in varistor layer containing ZnO as a main component.

Internal electrode contains Ag as a main component and is made of a metal containing at least one type selected from Pt and Au. The total weight of Pt and Au with respect to the weight of the metal constituting internal electrode is set between 2% and 30% (inclusive). With such a configuration, diffusion of Ag into varistor layer can be prevented, and a laminated varistor excellent in clamping voltage ratio can be obtained.

A functional contactor is provided. The functional contactor according to one embodiment of the present invention comprises: a conductive elastic portion having elasticity and electrically contacting one of a circuit board of an electronic device, a bracket coupled to the circuit board, and a conductor which can come into contact with the human body; a substrate made from a dielectric material and having a groove in either the upper surface or the lower surface thereof; and a functional element comprising a high dielectric material inserted into the groove and made from sintered ceramic having a higher dielectric constant than a dielectric material, a first electrode disposed on the upper surface of the substrate and electrically connected in series to the conductive elastic portion, and a second electrode disposed on the lower surface of the substrate and opposite to the first electrode.

A functional contactor is provided. The functional contactor according to one embodiment of the present invention comprises: a conductive elastic portion having elasticity and electrically contacting one of a circuit board of an electronic device, a bracket coupled to the circuit board, and a conductor which can come into contact with the human body; a substrate made from a dielectric material and having a groove in either the upper surface or the lower surface thereof; and a functional element comprising a high dielectric material inserted into the groove and made from sintered ceramic having a higher dielectric constant than a dielectric material, a first electrode disposed on the upper surface of the substrate and electrically connected in series to the conductive elastic portion, and a second electrode disposed on the lower surface of the substrate and opposite to the first electrode.

Focusing on zinc oxide itself, which is a main raw material for a zinc oxide varistor (laminated varistor), a predetermined amount of additive is added to a zinc oxide powder having crystallite size of 20 to 100 nm, particle diameter of 20 to 110 nm found using a specific area BET method, untamped density of 0.60 g/cm.sup.3 or greater, and tap density of 0.80 g/cm.sup.3 or greater. This allows a zinc oxide sintered body to secure uniformity, high density, and high electric conductivity, resulting in a zinc oxide varistor with high surge resistance, capable of downsizing and cost reduction. Moreover, addition of aluminum (Al), as a donor element, to the zinc oxide powder allows control of sintered grain size in conformity with the aluminum added amount and baking temperature, and also allows adjustment of varistor voltage, etc.

Focusing on zinc oxide itself, which is a main raw material for a zinc oxide varistor (laminated varistor), a predetermined amount of additive is added to a zinc oxide powder having crystallite size of 20 to 100 nm, particle diameter of 20 to 110 nm found using a specific area BET method, untamped density of 0.60 g/cm.sup.3 or greater, and tap density of 0.80 g/cm.sup.3 or greater. This allows a zinc oxide sintered body to secure uniformity, high density, and high electric conductivity, resulting in a zinc oxide varistor with high surge resistance, capable of downsizing and cost reduction. Moreover, addition of aluminum (Al), as a donor element, to the zinc oxide powder allows control of sintered grain size in conformity with the aluminum added amount and baking temperature, and also allows adjustment of varistor voltage, etc.

Integrated device having GDT and MOV functionalities. In some embodiments, an electrical device can include a first layer and a second layer joined with an interface, with each having an outer surface and an inner surface, such that the inner surfaces of the first and second layers define a sealed chamber therebetween. The electrical device can further include an outer electrode implemented on the outer surface of each of the first and second layers, and an inner electrode implemented on the inner surface of each of the first and second layers. The first layer can include a metal oxide material such that the first outer electrode, the first layer, and the first inner electrode provide a metal oxide varistor (MOV) functionality, and the first inner electrode, the second inner electrode, and the sealed chamber provide a gas discharge tube (GDT) functionality.

A chromaticity of zinc oxide is measured. The durability of a zinc oxide varistor is evaluated based on the chromaticity. This provides a varistor with a high durability stably.

A chromaticity of zinc oxide is measured. The durability of a zinc oxide varistor is evaluated based on the chromaticity. This provides a varistor with a high durability stably.