Sealing electrode and surge absorber using the same

A surge absorber comprising:

• a glass tube;
• a surge absorbing element incorporated in the glass tube and having a pair of cap electrodes on both ends of a ceramic member of a pillar shape coated by a conductive coating wherein a micro-gap is formed on a periphery surface of the ceramic member,
• a sealing electrode sealed in a glass tube comprising:
• an electrode member formed of an alloy containing iron and nickel;
• a copper thin film formed on both surfaces of the electrode member to coat the electrode member;
• a Cu.sub.2 O film formed on a surface of the copper thin film facing an inside surface of the glass tube electrically connected to the one pair of cap electrodes;
• and
• inert gas sealed into space formed by the sealing electrodes and the glass tube.

A surge absorber comprising:

• a glass tube;
• a surge absorbing element incorporated in the glass tube and having a pair of cap electrodes on both ends of a ceramic member of a pillar shape coated by a conductive coating wherein a micro-gap is formed on a periphery surface of the ceramic member;
• a sealing electrode sealed in a glass tube, the surge absorbing element being fixed to the sealing electrodes by means of the cap electrodes, the sealing electrode comprising:
• an electrode member made of an alloy containing iron and nickel;
• a copper thin film provided both on a surface of the member of a contact portion with the glass tube and on a surface of the member facing on an inside of the glass tube;
• a Cu.sub.2 O film formed on a surface of the copper thin film electrically connected to the one pair of cap electrodes, the surge absorbing element being fixed to the sealing electrodes by means of the cap electrodes;
• and
• inert gas sealed into space formed by the sealing electrodes and the glass tube.