Claims
- 1. A chip polymer PTC thermistor comprising:a conductive polymer having PTC properties; a first outer electrode in contact with said conductive polymer; a second outer electrode sandwiching said conductive polymer with said first outer electrode; one or more inner electrode disposed in between and parallel to said first and second outer electrodes, said one or more inner electrode being sandwiched by said conductive polymer; a first electrode directly electrically coupled with said first outer electrode; and a second electrode disposed electrically independently from said first electrode; wherein, when defining an inner electrode placed at the most adjacent to said first outer electrode as “one”, and defining a “n”th inner electrode counting from the “one” as a “n”th inner electrode, odd-numbered inner electrodes are directly coupled with said second electrode and even-numbered inner electrodes, with said first electrode, and when the total number of said inner electrodes is an odd number, said second outer electrode is electrically directly coupled with said first electrode, whereas when it is an even number, coupled with said second electrode; wherein, defining a distance from said odd-numbered inner electrode to said first electrode, or from said even-numbered inner electrode to said second electrode as “a”, and a distance between the adjacent inner electrodes among said inner electrodes, or a distance between the inner electrode adjacent to said first outer electrode, or said second outer electrode, and said first outer electrode, or said second outer electrode, as “t”, a ratio a/t is within a range 3-6, and wherein said ratio a/t is increased by maintaining “t” and increasing “a” in order to increase resistance of said thermistor.
- 2. The chip polymer PTC thermistor of claim 1, whereinsaid first electrode is a first side electrode provided on one of the side faces of said conductive polymer, while said second electrode is a second side electrode provided on the other side face of said conductive polymer.
- 3. The chip polymer PTC thermistor of claim 1, whereinsaid first electrode is a first through electrode provided penetrating in said conductive polymer at one end, while said second electrode is a second through electrode provided penetrating in said conductive polymer at the other end.
- 4. The chip polymer PTC thermistor of claim 1, whereinsaid first electrode is a first side electrode provided on one of the side faces of said conductive polymer, said first side electrode making direct electrical contact with said first outer electrode and said even-numbered inner electrode, while said second electrode is a second side electrode provided on the other side face of said conductive polymer, said second side electrode making direct electrical contact with said odd-numbered inner electrode; and when the total number of said inner electrodes is an odd number, said second outer electrode makes direct electrical contact with said first side electrode, whereas when the total number of said inner electrodes is an even number, said second outer electrode makes direct electrical contact with said second side electrode.
- 5. The chip polymer PTC thermistor of claim 1, whereinsaid ratio a/t is within a range 4-6.
- 6. A chip polymer PTC thermistor comprising:a conductive polymer having PTC properties; a first outer electrode in contact with said conductive polymer; a second outer electrode sandwiching said conductive polymer with said first outer electrode; one or more inner electrode disposed in between and parallel to said first and second outer electrodes and sandwiched by said conductive polymer; a first outer sub electrode disposed on a same plane with said first outer electrode, said first outer sub electrode being separated from said first outer electrode with a certain specific distance while being in contact with said conductive polymer; a second outer sub electrode disposed on a same plane with said second outer electrode, said second outer sub electrode being separated from said second outer electrode with a certain specific distance while being in contact with said conductive polymer; inner sub electrodes provided for a same number of said inner electrodes, each of said sub electrodes being disposed on same planes with said respective inner electrodes and separated from said inner electrode with a certain specific distance while in contact with said conductive polymer; a first electrode directly electrically coupled with said first outer electrode; a second electrode disposed electrically independently from said first electrode, and making direct electrical contact with said first outer sub electrode; wherein, when defining an inner electrode placed at the most adjacent to said first outer electrode as “one”, and defining a “n”th inner electrode counting from the “one” as a “n”th inner electrode, odd-numbered inner electrodes and even-numbered inner sub electrodes are directly coupled with said second electrode, and even-numbered inner electrodes and odd-numbered inner sub electrodes are directly coupled with said first electrode, and when the total number of said inner electrodes is an odd number, said second outer electrode is electrically directly coupled with said first electrode, and said second outer sub electrode is electrically directly coupled with said second electrode, when it is an even number, said second outer electrode is electrically directly coupled with said second electrode, and said second outer sub electrode is electrically directly coupled with said first electrode; wherein, defining a distance from said odd-numbered inner electrode to said first electrode, or from said even-numbered inner electrode to said second electrode as “a”, whereas a distance between the adjacent inner electrodes among said inner electrodes, or a distance between the inner electrode disposed next to said first outer electrode, or said second outer electrode, and said first outer electrode, or said second outer electrode, as “t”, a ratio a/t is within a range 3-6, and wherein said ratio a/t is increased by maintaining “t” and increasing “a” in order to increase resistance of said thermistor.
- 7. The chip polymer PTC thermistor of claim 6, whereinsaid first electrode is a first side electrode provided on one of the side faces of said conductive polymer, while said second electrode is a second side electrode provided on the other side face of said conductive polymer.
- 8. The chip polymer PTC thermistor of claim 6, wherein said first electrode is a first through electrode provided penetrating in said conductive polymer at one end, while said second electrode is a second through electrode provided penetrating in said conductive polymer at the other end.
- 9. The chip polymer PTC thermistor of claim 6, whereinsaid first electrode is a first side electrode provided on one of the side faces of said conductive polymer, said first side electrode making direct electrical contact with said first outer electrode, said even-numbered inner electrode and said odd-numbered inner sub electrode, while said second electrode is a second side electrode provided on the other side face of said conductive polymer, said second side electrode making direct electrical contact with said first outer sub electrode, said odd-numbered inner electrode and said even-numbered inner sub electrode; wherein when the total number of said inner electrodes is an odd number, said second outer electrode makes direct electrical contact with said first side electrode, and said second outer sub electrode makes direct electrical contact with said second side electrode, when the total number of said inner electrodes is an even number, said second outer electrode makes direct electrical contact with said second side electrode, and said second outer sub electrode makes direct electrical contact with said first side electrode.
- 10. The chip polymer PTC thermistor of claim 6, wherein said ratio a/t is within a range 4-6.
- 11. A thermistor, comprising:a polymer having conductive filler; first and second side electrodes on different sides of said polyer; an upper electrode extending from said first side electrode towards and spaced away from said second side electrode; an inner electrode extending from said second side electrode towards and spaced away from said first side electrode; wherein said inner electrode is spaced away from said first side electrode by a distance “a”, said inner electrode is spaced away from said upper electrode by a distance “t”, and wherein a/t is in the range of 3-6.
- 12. A thermistor according to claim 11 further comprising a further inner electrode extending from said first side electrode towards said second side electrode.
- 13. A thermistor according to claim 11, wherein a portion of said upper electrode is directly over at least a portion of said inner electrode.
- 14. A thermistor according to claim 11, wherein said inner electrode is buried in said polymer.
Priority Claims (2)
Number |
Date |
Country |
Kind |
10-294946 |
Oct 1998 |
JP |
|
11-153292 |
Jun 1999 |
JP |
|
Parent Case Info
THIS APPLICATION IS A U.S. NATIONAL PHASE APPLICATION OF PCT INTERNATIONAL APPLICATION PCT/JP99/05706.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/JP99/05706 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO00/24010 |
4/27/2000 |
WO |
A |
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Mar 1997 |
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Jan 1998 |
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Non-Patent Literature Citations (4)
Entry |
International Search Report corresponding to application No. PCT/JP99/05706 dated Jan. 25, 2000. |
English translation of PCT/ISA/210, Sep. 14, 2000. |
International Search Report for PCT/JP00/01228 dated Jun. 6, 2000. |
English translation of PCT/ISA/210 Jun. 6, 2000. |