Electrical composite part

A disc type CR composite part for use in electrical and electronic equipment which comprises:

• a disc substrate of ceramic dielectric material having first and second opposed surfaces;
• a through-opening formed at the central portion of said substrate and extending from said first to said second surface;
• first and second electrodes provided on said first surface and located adjacent to the outer periphery and around said through-opening of said substrate, respectively;
• a third electrode provided on said second surface of said substrate;
• means for selectively shortcircuiting said third electrode with one of said first and second electrodes;
• resistor elements connected between said first and second electrodes and shaped to have extensive central portions that extend over said first surface of said substrate in a non-diametrical direction of said substrate;
• and
• an electrically insulating covering layer formed at least on said one surface of said substrate, the path of said resistor means being such that said electrically insulating covering is directly adjacent to at least a portion of said first surface along all diameters of said disc substrate.

Apparatus comprising:

• (A) a disc type CR composite part for use in electrical and electronic equipment, said disc type composite part comprising:
• (1) a disc shaped substrate of ceramic dielectric material having first and second opposed surfaces;
• (2) a through-opening formed in the central portion of said substrate and extending from said first to said second surfaces;
• (3) first and second electrodes provided on said first surface and located adjacent to the outer periphery and around said through-opening of said substrate, respectively;
• (4) a third electrode provided on said second surface of said substrate;
• (5) means for selectively shortcircuiting said third electrode with one of said first and second electrodes;
• (6) resistor elements connected between said first and second electrodes and shaped to have extensive central portions that extend over said first surface of said substrate in a non-diametrical direction of said substrate;
• and
• (7) an electronically insulating covering layer formed at least on said one surface of said substrate;
• and
• (B) a metallic casing having an outer cylindrical member and an inner tube member, said disc type CR composite part being accommodated at the lower portion inside said outer cylindrical member in a position above a lower opening formed at the bottom portion of said outer cylindrical member, with said first electrode layer of said disc type CR composite part being soldered to said outer cylindrical member which serves as one terminal of said CR composite part, said inner tube member extending through said through-opening in said lower opening of said outer cylindrical member, with said shortcircuiting means being soldered to said inner tube member which serves as the other terminal of said CR composite part.

Apparatus comprising:

• (A) a disc type CR composite part for use in electrical and electronic equipment, said disc type composite part comprising:
• (1) a disc shaped substrate of ceramic dielectric material having first and second opposed surfaces;
• (2) a through-opening formed in the central portion of said substrate and extending from said first to said second surfaces;
• (3) first and second electrodes provided on said first surface and located adjacent to the outer periphery and around said through-opening of said substrate, respectively;
• (4) a third electrode provided on said second surface of said substrate;
• (5) means for selectively shortcircuiting said third electrode with one of said first and second electrodes;
• (6) resistor elements connected between said first and second electrodes and shaped to have extensive central portions that extend over said first surface of said substrate in a non-diametrical direction of said substrate;
• and
• (7) an electronically insulating covering layer formed at least on said one surface of said substrate;
• and
• (B) a metallic casing having an outer cylindrical member and an inner tube member, said disc type CR composite part being accommodated at the lower portion inside said outer cylindrical member in a position above a lower opening formed at the bottom portion of said outer cylindrical member, with said first electrode layer of said disc type CR composite part being soldered to said outer cylindrical member which serves as one terminal of said CR composite part, said inner tube member extending through said through-opening and said lower opening of said outer cylindrical member, with said shortcircuiting means being soldered to said inner tube member which serves as the other terminal of said CR composite part.