Power-supplying member and heating apparatus using the same
The power-supplying member comprises: a first rod-shaped member connected to at least one of a heating resistor and an electrode; a second rod-shaped member connected to a power supply; and a thermal-function member, which is disposed between the first rod-shaped member and the second rod-shaped member, and which has a smaller axial cross section area and a larger surface area as compared to the first and second rod-shaped members.
1. A power-supplying member, which is disposed in a hollow part of a tubular supporting member, and which supplies power to at least one of a heating resistor and an electrode which are embedded in a ceramic base supported by the tubular supporting member, the power-supplying member comprising:
a first rod-shaped member connected to said at least one of a heating resistor and an electrode;
a second rod-shaped member connected to a power supply; and
a thermal-function member, which is disposed between the first rod-shaped member and the second rod-shaped member, and which has a smaller axial cross section area and a larger surface area as compared to the first and second rod-shaped members,
wherein a ratio of the axial cross sectional area of the thermal-function member to the axial cross sectional areas of the first and second rod-shaped members is not larger than 0.5.
2. The power-supplying member according to claim 1 , wherein the thermal-function member includes a hollowed portion in axial cross section.
3. The power-supplying member according to claim 1 , wherein the ratio of surface area of the thermal-function member to volume of the thermal-function member is not smaller than 2.0.
4. The power-supplying member according to claim 2 , wherein the ratio of surface area of the thermal-function member to volume of the thermal-function member is not smaller than 2.0.
5. The power-supplying member according to claim 1 , wherein the thermal-function member has concavity and convexity on its axial side surface.
6. The power-supplying member according to claim 2 , wherein the thermal-function member has concavity and convexity on its axial side surface.
7. The power-supplying member according to claim 3 , wherein the thermal-function member has concavity and convexity on its axial side surface.
8. The power-supplying member according to claim 4 , wherein the thermal-function member has concavity and convexity on its axial side surface.
9. A heating apparatus comprising:
a ceramic base in which at least one of a heating resistor and an electrode are embedded;
a tubular supporting member which supports the ceramic base; and
a power-supplying member, which is disposed in a hollow part of the tubular supporting member, and which supplies power to at least one of the heating resistor and the electrode,
wherein the power-supplying member comprises a first rod-shaped member connected to said at least one of a heating resistor and an electrode a second rod-shaped member connected to a power supply, and a thermal-function member, which is disposed between the first rod-shaped member and the second rod-shaped member, and which has a smaller axial cross section area and a larger surface area as compared to the first and second rod-shaped members,
wherein a ratio of the axial cross sectional area of the thermal-function member to the axial cross sectional areas of the first and second rod-shaped members is not larger than 0.5.