Self-regulating heater utilizing ferrite-type body

A self-regulating heater device comprising:

• central conductor means for carrying a high frequency alternating current and producing a magnetic field around the exterior thereof;
• a ferrite-type body having a Curie temperature, Tc, positioned in the magnetic field of the central conductor means and being sufficiently lossy to be capable of producing sufficient heat by internal losses in said magnetic field to raise the temperature of the ferrite-type body to Tc;
• and
• connector means adapted for electrically connecting said central conductor means to a high frequency alternating current power supply capable of causing the ferrite-type body to heat to Tc by internal losses;
• whereby the heater device heats to Tc and self-regulates at Tc when powered by said power supply at a sufficiently high frequency and at sufficient power to heat ferrite-type body to Tc by internal losses.

An elongate self-regulating heater device comprising:

• an elongate central conductor means extending the length of the device for carrying a high frequency alternating current and producing a magnetic field around the exterior thereof;
• a ferrite-type body having a Curie temperature, Tc, positioned in the magnetic field of the central conductor means and being sufficiently lossy to be capable of producing sufficient heat by internal losses in said magnetic field to raise the temperature of the ferrite-type body to Tc;
• elongate surface means positioned on the outside of the ferrite-type body for transferring heat therefrom to the material or substrate to be heated;
• and
• conductor means adapted for electrically connecting said central conductor means to a high frequency alternating current power supply capable of causing the ferrite-type body to heat to Tc by internal losses;
• whereby the heater device heats to Tc and self-regulates at Tc when powered by said power supply at a sufficiently high frequency and sufficient power to heat ferrite-type body to Tc by internal losses.

A self-regulating heater device comprising:

• central conductor means for carrying a high frequency alternating current and producing a magnetic field around the exterior thereof;
• a ferrite-type body having a Curie temperature, Tc, positioned in the magnetic field around the central conductor means and being sufficiently lossy to be capable of producing sufficient heat by internal losses in said magnetic field to raise the temperature of the ferrite-type body to Tc;
• and
• connector means adapted for electrically connecting said central conductor means of high frequency alternating current power supply capable of causing the ferrite-type body to heat to Tc by internal losses;
• whereby the heater device heats to Tc and self-regulates at Tc when powered by said power supply at a sufficiently high frequency and sufficient power to heat ferrite-type body to Tc by internal losses;
• wherein the central conductor means comprises a hollow tube adapted for receiving material to be heated.