Abstract: The device and method are used for controlling eddy currents generated by an electro-magnetic heater having at least one magnetic field producing element. To control the heater, a source of heat is used to heat a Curie temperature material, located adjacent to the magnetic field producing element. This prevents heat from being generated in the object being heated.

Abstract: An electromagnetic induction heating apparatus capable of uniformize a temperature distribution in a longitudinal direction of an induction heating member includes: an exciting coil (magnetic flux generation means); a fixation roller (induction heating member) for generating heat by electromagnetic induction heating by action of magnetic flux generated by the exciting coil the induction heating member heating a material to be heated through heat generation thereof by introducing the material to be heated into a heating portion and conveying the material to be heated in contact with the fixation roller; and magnetic flux shielding plate (magnetic flux adjusting means) for changing a distribution of a density of an effective magnetic flux which is the magnetic flux generated by the exciting coil and actable on the fixation roller, in a longitudinal direction of the heating portion perpendicular to a conveyance direction of the material to be heated.

Abstract: A heating apparatus, for heating a material P to be heated by heat from a heat generation member which has a predetermined curie temperature characteristic and generates heat by magnetic flux produced by a magnetic flux generation device. The apparatus includes a discrimination device for discriminating whether or not the curie temperature characteristic of the heat generation member is a predetermined characteristic and a control device for terminating the supply of electric power to the magnetic flux generation device when the discrimination device determines that the curie temperature characteristic is not the predetermined characteristic.

Abstract: An apparatus (10) and method for preheating welds uses a centered induction plate (12) having preferably a plurality of induction coils (30, 32) to impart the generation of heat in the materials to be welded (14), being interactively controlled by at least a temperature sensor (90, 92) and power supply control loop (16) so that even preheating can be obtained for a selected length of time given the parameters of the weld desired.

Abstract: An image heating apparatus includes a heating rotatable member for heating an image on a recording material in a heating nip; a magnetic flux generator for generating a magnetic flux for induction heat generation in the heating rotatable member; a magnetic flux confining device for confining the magnetic flux directed toward a predetermined region of the heating rotatable member from the magnetic flux generator; and a moving device for repeatedly moving the magnetic flux confining device during a heating operation between the operating position and a retracted position retracted from the operation position, when the recording material which has a predetermined width overlapping with a part of the predetermined region is continuously heated by the apparatus.

Abstract: The invention relates to a shrinking device for shrinking a rotary tool into a central receiving opening of a toolholder which holds said rotary tool in a press fit. The device an induction heating device for thermally expanding the toolholder in the area of the receiving opening. A cooling device with at least one cooling collar which can be placed on the toolholder, in physical contact with the same, and through which a liquid coolant can flow, is provided for cooling the receiving opening area of the toolholder. This liquid cooling considerably reduces the overall time span needed for the shrinking process.

Abstract: An image heating apparatus for heating an image on a recording material by heat generation of a heating member includes a coil configured to generate a magnetic flux by energization a heat generation member having an electroconductive layer that generates heat by magnetic flux for heating an image on a recording material and, a frequency switching device for switching a frequency of a current supplied to the coil. The electroconductive layer includes a first electroconductive member at a central portion thereof and a second electroconductive member at an end portion thereof. The first electroconductive member has a resistence characteristic, with respect to the frequency of the current supplied to the coil, different from that of the second electroconductive member.

Abstract: An image heating apparatus has a magnetic flux generator for generating a magnetic flux; a heat generation member for generating heat by the magnetic flux generator; a magnetic flux adjustor for adjusting an effective magnetic flux region toward the heat generation member with respect to a widthwise direction which is perpendicular to a feeding direction of a material to be heated, wherein the material to be heated is heated by heat generation of the heat generation means; wherein the magnetic flux adjustor includes a magnetic flux adjusting member and moving member for moving the magnetic flux adjusting member, and wherein a temperature distribution in theat generation member with respect to the widthwise direction is adjusted by moving the flux adjusting member to a predetermined magnetic flux adjusting position by the moving member; and a discriminator for discriminating whether the effective magnetic flux region corresponds to a size of the material to be heated or not when the magnetic flux adjusting mem

Abstract: A high frequency induction-heating device 3 of the apparatus 1 for heating work includes a pair of opposite work coils accommodated within the coil casings 17 and 19 respectively. The casings 17 and 19 can be displaced in a unit by a motor provided under the device. Thus, the distance between the pair of work coils, and the distance between the work (W) and each work coil can be adjusted. The apparatus includes a plurality of heating devices 3 to which high frequency power sources are provided respectively. The apparatus and method for heating of a work with the apparatus is capable of treating a plurality of works (W) continuously under controlled conditions on work coil shapes and positions depending on the size and/or the shape of the works (W).

Abstract: A heating apparatus of an electromagnetic induction heating type includes a coil and a roller which generates heat by the action of magnetic flux generated from the coil. A recording material is heated by the roller. The heating apparatus further includes a movable magnetic flux decreasing member for decreasing magnetic flux, generated from the coil, acting on the roller. In the heating apparatus, a shutter is moved toward an effective position at which a temperature in a non-conveyance area is lowered when a recording material having a size lower than a maximum conveyable size is conveyed, and is moved away from the effective position depending on the temperature in the non-conveyance area, irrespective of the size of the recording material to be conveyed.

Abstract: A high frequency induction heater built in an injection mold. The high frequency induction heater has a metal or silicon mold-insert, at least a heating module and at least a thermometer detector. The elements are reasonably fit with the mold-insert utilizing well-defined MEMS technology and UV-LIGA process. The high frequency induction heater is employed to apply a local heat for a microstructure of mold-insert during the micro molding process. By using the high frequency induction heater a fluid mold flow and high aspect ratio replication is achieved.

Abstract: An induction heating cooker includes an infrared sensor for sensing an infrared intensity from a load pot, a waveguide for guiding infrared radiation from the load pot to the infrared sensor, a first magnetism-proofing unit and a second magnetism-proofing unit for reducing magnetic fluxes leaking from a heating coil. Placement of the waveguide at a position lower than an upper surface of the second magnetism-proofing unit reduces self-heating of the waveguide due to magnetic flux supplied from the heating coil. As a result, a temperature rise of the infrared sensor due to radiation heat from the waveguide can be reduced, and an accuracy of sensing a temperature by the infrared sensor can be improved.

Abstract: In an electromagnetic induction heating-type heating apparatus for moving a temperature decreasing member toward or apart from an effective position where a temperature in a predetermined area is decreased in order to take countermeasure against temperature rise at a non-sheet passing portion of a heating roller, a Curie temperature of the heating roller is not less than a predetermined image heating temperature and is less than a heat-resistant temperature of the heating apparatus.

Abstract: A heating apparatus includes a magnetic field generator that generates an alternating magnetic field, a rotatable member disposed in the alternating magnetic field and capable of generating heat by electromagnetic induction, a temperature detector that detects a temperature of the rotatable member, a comparator that compares the detected temperature to a target temperature: and a controller that controls electric energy supply to the magnetic field generator based on detected temperatures of different positions of the rotatable member.

Abstract: An induction heating cooker includes a surface, a heating coil for inductionally-heating a load pan, an inverter for supplying a high-frequency current to the heating coil, an infrared detector which detects infrared radiation emitted from the load pan and is located under a top plate, a first temperature detector for detecting a temperature of the load pan based on an output of the infrared detector, a heating controller for controlling a power output from the inverter, a thermo-sensitive element for receiving heat from the top plate, and a second temperature detector for detecting a temperature of the load pan based on an output of the first thermo-sensitive element. This induction heating cooker detects a temperature change of the load pan accurately by detecting an infrared radiation from the load pan, and detects the temperature of the load pan by the heat conduction from the pan even if ambient light enters.

Abstract: Information on a temperature of a heat generation member at a position which is in the neighborhood of an end portion of a conveyance area of a material, to be heated, having a maximum size and in the neighborhood of a non-conveyance area of a material, to be heated, having a size smaller than the maximum size is detected by temperature information detector, and a changer lowers a target temperature of the heat generation member depending on a detection result of the temperature information detector. Thereafter, when the detection result of the temperature information detector reaches a predetermined temperature, a magnetic flux adjusting member is started to be moved by a moving device.

Abstract: A heating apparatus has a magnetic flux generator and a rotatable induction heating element for generating heat through electromagnetic induction by the action of magnetic flux generated by the magnetic flux generator, and heats a material to be heated by causing the material to be heated to contact the induction heating element. The heating apparatus further includes a thermistor for detecting a surface temperature of the induction heating element, power supply circuits for controlling power to be supplied to the magnetic flux generator on the basis of signals from the temperature detection, a Curie temperature reaching detector for detecting that the temperature of the induction heating element reaches the Curie temperature, and control circuits for detecting that the material to be heated is wound around the induction heating element on the basis of signals from the thermistor and the Curie temperature reaching detector.

Abstract: The present invention offers an induction heating apparatus in which the infrared sensor performs stable temperature detection without undergoing the influence of leakage magnetic flux from the induction heating means.

Abstract: An electrical oven and method of controlling the same includes a heater heating unit to heat food using an electric heater; an induction heating unit to heat the food using a high-frequency current, and a control unit to drive the heater heating unit and the induction heating unit simultaneously in a preheating cooking mode. The electric oven of the present invention carries out heating by the electric heater and induction heating by high-frequency current, so preheating time required for an inner temperature of a cooking cavity to reach a preheating temperature is decreased, thereby reducing a total cooking time.

Abstract: A heating apparatus, for heating a material P to be heated by heat from a heat generation member which has a predetermined curie temperature characteristic and generates heat by magnetic flux produced by a magnetic flux generation device. The apparatus includes a discrimination device for discriminating whether or not the curie temperature characteristic of the heat generation member is a predetermined characteristic and a control device for terminating the supply of electric power to the magnetic flux generation device when the discrimination device determines that the curie temperature characteristic is not the predetermined characteristic.

Abstract: A method and apparatus for reducing electrical noise in an electrical signal from a temperature feedback device to an induction heating system. The induction heating system has an electrical connector that is adapted to electrically couple a temperature feedback device to a system controller and to ground via a capacitor circuit. The capacitor circuit shunts electrical noise to ground but allows a temperature signal from the temperature feedback device to be received by the system controller. A shielded extension cable to electrically couple the temperature feedback device to an induction heating system may be used. The shielding of the extension cable is electrically coupled to ground.

Abstract: A workpiece heating system having an induction heating power source and a controller. The controller is operable to control the operation of the power source according to programming instructions received from a user. The controller enables a user to establish a sequence of inductive heating operations to be performed automatically by the induction heating system from among a selection of inductive heating operations. A temperature feedback device may be included to provide the controller with the workpiece temperature. A data recorder may be provided to receive and record the workpiece temperature.

Abstract: A delivery apparatus is provided by the invention. The delivery apparatus includes a container for holding an article to be delivered and a heater. The container includes a housing forming an interior area and an opening. The opening is provided with a size sufficient to allow movement of the article from outside the container to within the interior area, and from within the interior area to outside the container. The heater is provided for placement within the interior area for heating the article. The heater includes an electrically conductive coil for providing an electric current when exposed to a magnetic field, and an electrical resistance heating element for generating heat. The electrical resistance heating element is provided in electrical connectivity with the electrically conductive coil. A delivery apparatus assembly is provided which includes an induction range for generating a magnetic field. A heater and a method for delivering food are provided by the invention.

Abstract: A heating apparatus has a magnetic flux generator and a rotatable induction heating element for generating heat through electromagnetic induction by the action of magnetic flux generated by the magnetic flux generator, and heats a material to be heated by causing the material to be heated to contact the induction heating element. The heating apparatus further includes a thermistor for detecting a surface temperature of the induction heating element, power supply circuits for controlling power to be supplied to the magnetic flux generator on the basis of signals from the temperature detection, a Curie temperature reaching detector for detecting that the temperature of the induction heating element reaches the Curie temperature, and control circuits for detecting that the material to be heated is wound around the induction heating element on the basis of signals from the thermistor and the Curie temperature reaching detector.

Abstract: A system and method for providing multiple cooking modes and an ability to automatically heat cooking vessels and other objects using RFID technology, and an ability to read and write heating instructions and to interactively assist in their execution. An induction heating range is provided with two antennas per hob, and includes a user interface display and input mechanism. The vessel includes an RFID tag and a temperature sensor. In a first cooking mode, a recipe is read by the range and the range assists a user in executing the recipe by automatically heating the vessel to specified temperatures and by prompting the user to add ingredients. The recipe is written to the RFID tag so that if the vessel is moved to another hob, into which the recipe has not been read, the new hob can read the recipe from the RFID tag and continue in its execution.

Abstract: An induction heating apparatus for a fixing device of an image forming apparatus includes a rectifying circuit for rectifying a commercial power supply, an excitation coil, a switching element for switching the supply of the output of the rectifying circuit to the excitation coil, and a switching signal output unit for outputting a switching signal for the switching element thereby supplying the excitation coil with a high frequency current. The invention limits a current supply time to the excitation coil in such a manner that the maximum output for induction heating is set according to the commercial power supply voltage, thereby reducing the first print time without a power consumption in excess of the rating.

Abstract: In a method for wrapping an article in a sheet of thermoplastic wrapping material, the temperature of an at least partly metal belt (5) looped and induction heated to seal wrapping material (4) is detected by detecting a first signal (S1) to the voltage (V) applied to the belt (5), and a second signal (S2) related to the current (I) circulating along the belt (5); and by calculating the electric resistance (R) of the belt (5) as a function of the first and second signal (S1, S2); the electric resistance (R) of the belt (5) being related to the temperature (T) of the belt (5).

Abstract: A heat treatment apparatus includes a plurality of induction heating devices which heat a steel product, a correctional device which corrects the steel product, a computing device which computes supply predetermined electric power which is supplied to the induction heating device, on the basis of a size of the steel product, a conveying speed of the steel product, a heating target temperature of the steel product, and a predetermined temperature of the steel product at the previous stage of the induction heating devices, and a power supply unit which supplies the supply predetermined electric power computed by the computing device to the induction heating devices, and the computing device which computes electric power for uniform heating processing on the steel product or electric power for surface layer heating processing on the steel product.

Abstract: A delivery apparatus is provided by the invention. The delivery apparatus includes a container for holding an article to be delivered and a heater. The container includes a housing forming an interior area and an opening. The opening is provided with a size sufficient to allow movement of the article from outside the container to within the interior area, and from within the interior area to outside the container. The heater is provided for placement within the interior area for heating the article. The heater includes an electrically conductive coil for providing an electric current when exposed to a magnetic field, and an electrical resistance heating element for generating heat. The electrical resistance heating element is provided in electrical connectivity with the electrically conductive coil. A delivery apparatus assembly is provided which includes an induction range for generating a magnetic field. A heater and a method for delivering food are provided by the invention.

Abstract: A device for inductive billet-heating includes a single or multi-layer billet-heating coil (4) for a round billet (5), in which the billet-heating coil (4) is made up of one or more consecutive, galvanically separated zones. The zones are supplied with electrical energy from a three-phase network by means of an electrical switching device and a control unit. The billet-heating coil (4) includes multiple, synchronically regulated zones (Z1, Z2 through Zn) with reference to frequency and phase of inductive field. For a current feed to each zone (Z1 through Zn) of the billet-heating coil (4), a converter (2) with variable frequency and a plurality of modules is provided. The converter includes plurality of power-moderate closed units with DS-network feed and synchronization of phase and frequency of an output voltage.

Abstract: A spatula heating apparatus with excellent usability which overcomes drawbacks inherent to conventional gas burner type and electro-thermal type apparatuses. A spatula heating apparatus for heating spatulas 9, 9a for wax molding includes a heating coil 8 for induction-heating of spatulas 9, 9a, a heating amount setting switch 5, and an inverter control circuit 21 for supplying high frequency current to the heating coil 8 to perform heating at a preset heating amount. When high frequency current is applied to the heating coil 8, the spatulas 9, 9a are heated at the preset heating amount through electromagnetic induction.

Abstract: A system is disclosed for determining optimal process settings for a conveyor oven, such as a reflow oven used to reflow solder paste on a PCB assembly. According to a disclosed embodiment, an ideal temperature profile is obtained from the solder paste specifications of the solder paste to be reflowed in the oven. The ideal temperature profile of the paste includes a preheat phase, a soak phase, a reflow phase and a cooling phase. One or more profiles that fit the oven are obtained by aligning the beginning of each phase of the ideal profile with a forward end of an oven zone. The profile that best fits the oven is selected as a target profile for the reflow soldering process. The set points of the oven zones for effecting the target profile when the solder paste is conveyed through the oven are determined.

Abstract: A high frequency induction heater built in an injection mold. The high frequency induction heater has a metal or silicon mold-insert, at least a heating module and at least a thermometer detector. The elements are reasonably fit with the mold-insert utilizing well-defined MEMS technology and UV-LIGA process. The high frequency induction heater is employed to apply a local heat for a microstructure of mold-insert during the micro molding process. By using the high frequency induction heater a fluid mold flow and high aspect ratio replication is achieved.

Abstract: A heat treatment apparatus includes a plurality of induction heating devices which heat a steel product, a correctional device which corrects the steel product, a computing device which computes supply predetermined electric power which is supplied to the induction heating device, on the basis of a size of the steel product, a conveying speed of the steel product, a heating target temperature of the steel product, and a predetermined temperature of the steel product at the previous stage of the induction heating devices, and a power supply unit which supplies the supply predetermined electric power computed by the computing device to the induction heating devices, and the computing device which computes electric power for uniform heating processing on the steel product or electric power for surface layer heating processing on the steel product.

Abstract: A method and apparatus for reducing electrical noise in an electrical signal from a temperature feedback device to an induction heating system. The induction heating system has an electrical connector that is adapted to electrically couple a temperature feedback device to a system controller and to ground via a capacitor circuit. The capacitor circuit shunts electrical noise to ground but allows a temperature signal from the temperature feedback device to be received by the system controller. A shielded extension cable to electrically couple the temperature feedback device to an induction heating system may be used. The shielding of the extension cable is electrically coupled to ground.

Abstract: In a method for wrapping an article in a sheet of thermoplastic wrapping material, the temperature of an at least partly metal belt (5) looped and induction heated to seal wrapping material (4) is detected by detecting a first signal (S1) related to the voltage (V) applied to the belt (5), and a second signal (S2) related to the current (I) circulating along the belt (5); and by calculating the electric resistance (R) of the belt (5) as a function of the first and second signal (S1, S2); the electric resistance (R) of the belt (5) being related to the temperature (T) of the belt (5).

Abstract: An induction heatable body (22) that quickly heats to a desired temperature, retains heat long enough to be used in almost any application, and develops no “hot spots” even when heated by a heating source having an uneven magnetic field distribution. The induction-heatable body (22) achieves the foregoing while remaining relatively lightweight, inexpensive and easy to manufacture. The induction-heatable body (22) includes a plurality of induction-heatable layers (32a, b, c) each sandwiched between alternating layers of heat retentive material (34a, b, c). The induction-heatable layers (32a, b, c) consist of sheets of graphite material that can be inductively heated at magnetic field frequencies between 20 and 50 kHz. The heat-retentive layers (34a, b, c) consist of solid-to-solid phase change material such as radiation cross-linked polyethylene.

Abstract: A measuring instrument includes a first temperature sensor, a second temperature sensor and circuitry. The first and second temperature sensors each generate a signal indicative of the temperature of a medium being detected. The circuitry is configured to activate verification of temperature being sensed with the first sensor. According to one construction, the first temperature sensor comprises at least one thermocouple temperature sensor and the second temperature sensor comprises an optical temperature sensor, each sensor measuring temperature over the same range of temperature, but using a different physical phenomena. Also according to one construction, the circuitry comprises a computer configured to detect failure of one of the thermocouples by comparing temperature of the optical temperature sensor with each of the thermocouple temperature sensors. Even further, an output control signal is generated via a fuzzy inference machine and control apparatus.

Abstract: Methods and Apparatus for detecting the presence of a conductor near an inductive coupling loop are disclosed. The method includes supplying an excitation to the coupling loop, measuring the signal distortion induced by the excitation signal, and monitoring the distortion in the signal for a change in harmonic content.

Abstract: A communication device (100, 200) capable of transmitting information provides the means for regulating the temperature (116) of one or more heat-sensitive modules or components (160) of the communication device through the adaptive and dynamic control of the flow of transmissions by the communication device, thereby eliminating the need for stored thermal profiles of heat-sensitive modules of the communication device. In addition to the heat-sensitive module(s), the communication device has a multi-logic controller block (110) and a transmission flow control block (140). The multi-logic controller block (110) receives the temperature of the heat-sensitive module (116) and a first control clock (112) and utilizes multi-value logic to generate a flow control signal having hysteresis (126).

Abstract: A method and apparatus for reducing electrical noise in an electrical signal from a temperature feedback device to an induction heating system. The induction heating system has an electrical connector that is adapted to electrically couple a temperature feedback device to a system controller and to ground via a capacitor circuit. The capacitor circuit shunts electrical noise to ground but allows a temperature signal from the temperature feedback device to be received by the system controller. A shielded extension cable to electrically couple the temperature feedback device to an induction heating system may be used. The shielding of the extension cable is electrically coupled to ground.

Abstract: A spatula heating apparatus with excellent usability which overcomes drawbacks inherent to conventional gas burner type and electro-thermal type apparatuses. A spatula heating apparatus for heating spatulas 9, 9a for wax molding includes a heating coil 8 for induction-heating of spatulas 9, 9a, a heating amount setting switch 5, and an inverter control circuit 21 for supplying high frequency current to the heating coil 8 to perform heating at a preset heating amount. When high frequency current is applied to the heating coil 8, the spatulas 9, 9a are heated at the preset heating amount through electromagnetic induction.

Abstract: A shrinkage device for rapidly shrinking and outshrinking tools, especially hard metal tools, in so-called shrinkage tension chucks using an induction heating coil, wherein a plurality of shrinkage chucks of paramagnetic or ferromagnetic materials can be positioned on a turntable and brought from a position below the induction coil, which can be lowered, into a cooling position.

Abstract: An induction-heating cooking device includes: an insulating plate which is partially or entirely light-transmissive, and on which an object to be heated is placed; a heating coil provided under the insulating plate, for heating the object to be heated; a display section for indicating a portion to be heated by the heating coil through the insulating plate; and an output control section for controlling electrical conduction to the heating coil, wherein the display section includes a light emitting section which is provided in the vicinity of a magnetic flux generated by the heating coil, and the light emitting section is laid and connected radially along a radial direction of the heating coil for indicating a portion to be heated by the heating coil.

Abstract: A fixing device comprising an endless heating member which is adapted to be contacted with a fixable member to thereby enable an image on the fixable member to be thermally fixed, an electromagnetic inductive coil member disposed close to the endless heating member and inductively heating the endless heating member, and an AC power supply circuit supplying an AC current to the electromagnetic inductive coil member. The coil member is constructed such that in a state where the coil member is positioned in the fixing device, a ratio between an inductance L of the coil member and a load resistance R of the coil member meets a condition of L/R<50×10−6 (H/&OHgr;).

Abstract: An image heating apparatus for heating an image formed on a recording material, including a rotation member; an excitation coil for generating a magnetic field to induce an eddy current in the rotation member; a temperature detecting element for detecting a temperature of the rotation member; and a controller for controlling an electrical supply to the excitation coil so that the temperature detected by the temperature detecting element is maintained at a set temperature, wherein while the set temperature is set a stand-by temperature, the controller controls the electrical supply to the excitation coil and the rotation member is maintained in a stoppage of rotation.

Abstract: An induction heating apparatus for a fixing device of an image forming apparatus includes a rectifying circuit for rectifying a commercial power supply, an excitation coil, a switching element for switching the supply of the output of the rectifying circuit to the excitation coil, and a switching signal output unit for outputting a switching signal for the switching element thereby supplying the excitation coil with a high frequency current.

Abstract: A transverse flux induction heating apparatus adjusts the level of edge heating of a workpiece by changing the pole pitch of induction coils forming the apparatus to provide a more uniform transverse temperature of the workpiece. Changes in the operating frequency of the induction power supply and in the distance between induction coils and workpiece are not required to adjust edge frequency heating. The pole pitch, and therefore, the level of edge heating can be continuously changed, or conveniently adjusted prior to a production run, in a high speed continuous heat treatment process for a workpiece.

Abstract: A delivery apparatus is provided by the invention. The delivery apparatus includes a container for holding an article to be delivered and a heater. The container includes a housing forming an interior area and an opening. The opening is provided with a size sufficient to allow movement of the article from outside the container to within the interior area, and from within the interior area to outside the container. The heater is provided for placement within the interior area for heating the article. The heater includes an electrically conductive coil for providing an electric current when exposed to a magnetic field, and an electrical resistance heating element for generating heat. The electrical resistance heating element is provided in electrical connectivity with the electrically conductive coil. A delivery apparatus assembly is provided which includes an induction range for generating a magnetic field. A heater and a method for delivering food are provided by the invention.

Abstract: In a heating apparatus of magnetic induction heating type for heating an image formed on a recording material, there are generated an unevenness and a ripple in a temperature on the surface of a fixing roller, leading to the deterioration of fixing ability. This is caused by in accurate temperature detection by induction noise components such as a noise resulting from an alternating magnetic field generated by an excitation coil. The purpose of the present invention is to provide an induction heating apparatus capable of temperature control satisfactory accuracy.