Abstract: The present invention relates to a temperature detection apparatus having a radiant temperature detection section including at least a ray emission portion which radiates at least rays and a ray detection portion which detects the rays, and capable of detecting temperature without contacting a detection object, a first atmospheric temperature detection section which outputs temperature information having a high temperature follow-up property in a case where the atmospheric temperature of the radiant temperature detection section is not more than predetermined temperature, and a second atmospheric temperature detection section which outputs temperature information having a high temperature follow-up property in a case where the atmospheric temperature of the radiant temperature detection section exceeds the predetermined temperature.

Abstract: The present invention relates to a fixing apparatus which radiates rays to a detection object and which detects the rays returned from the detection object to obtain a temperature signal. The apparatus specifies a radiant ratio of the surface of the detection object using at least one of accumulated image forming times, detection position, and radiation deterioration, corrects the detected temperature signal based on the specified radiant ratio of the surface of the detection object to produce temperature data, and controls a power to be supplied to a heating mechanism which raises temperature of the detection object based on the produced temperature data.

Abstract: A heating apparatus includes first and second coil members, a heat roller and an input control mechanism. The first and second coil members respectively are part of first and second excitation circuits. The heat roller generates an eddy current inside by a magnetic field generated by the first and second coil members. The input control mechanism drives the first and second excitation circuits. The input control mechanism starts driving only the first excitation circuit from a state where operations of the first and second excitation circuits are stopped. When the temperature detection mechanism detects a predetermined temperature, the input control mechanism stops supplying power to the first excitation circuit and supplies power only to the second excitation circuit, and the heat roller initiates rotating.

Abstract: According to a mode of the present invention, there is disclosed a fixing apparatus comprising a non-contact temperature detection section which detects a temperature by infrared rays radiated from a heating member, to made uniform a surface temperature of the heating member in an axial direction and a rotation direction based on first temperature information for detecting a temperature difference of the axial direction of the heating member and second temperature information for detecting the temperature difference of the rotation direction of the heating member.

Abstract: The present invention provides a fixing device and a digital photocopier which can shorten the time from an instruction of starting image formation to end of fixing. The fixing device is provided in a cylinder made of metal and having a small thickness, and includes a magnetic excitation coil. When the power source is turned on, all the electric power defined by subtracting an electric power amount consumed by components other than the fixing device is supplied to the magnetic excitation coil to perform heating. As the structural components of the photocopier and auxiliary devices added to the photocopier operate, the electric power defined by subtracting, from the maximum input electric power, the electric power consumed by the structural components of the photocopier and the auxiliary devices is supplied to perform heating. In this manner, the heat roller of the fixing device is heated, in a short time, to a temperature which enables fixing, so that the time required for first copying can be shortened.

Abstract: A CPU detects a temperature of a central part of a heating roller. If the detected temperature does not exceed 180° C., the CPU drives a central coil or a side-end coil for 0.4 second in accordance with a temperature difference between the central part of the heating roller and a side-end part of the heating roller. Then, the CPU drives the side-end coil or central coil for 0.2 second. Thereafter, the CPU detects the temperature of the central part and repeats the driving control until the detected temperature reaches 180° C.

Abstract: An image forming system has: a manuscript image reading device to scan a manuscript and obtain shade information on the manuscript; an exposure/development device to record a charged latent image in a photosensitive body based on the shade information obtained by said manuscript image reading device, to apply toners to the photosensitive body to transfer the toners to a recording medium; and a fixing device to fix the toners transferred to the recording medium by thermal pressing; said fixing device having a rotational heating member; a pressing roller for pressing from a bottom of the rotational heating member; and a non-contact temperature detector provided above a horizontal surface passing a rotation axis of the rotational heating member, which detects a temperature of said rotational heating member; wherein heating of the rotational heating member is controlled by a value detected by said non-contact temperature detector.

Abstract: A fixing apparatus includes a fixing device configured to, by allowing a sheet having a developing agent image on it to pass between a heating roller and a pressing roller set in contact with the heating roller, fix the developing agent image in which at least one of the heating roller and pressing roller is configured to have an inner elastic layer and a conductive layer formed on a surface side of the elastic layer and the elastic layer is bonded to the conductive layer by a heat-resistant adhesive having a heat-resistant temperature of over 200° C.

Abstract: According to a mode of the present invention, there is disclosed a fixing apparatus comprising a non-contact temperature detection section which detects a temperature by infrared rays radiated from a heating member, to made uniform a surface temperature of the heating member in an axial direction and a rotation direction based on first temperature information for detecting a temperature difference of the axial direction of the heating member and second temperature information for detecting the temperature difference of the rotation direction of the heating member.

Abstract: The present invention relates to a device including a body to be heated to which a magnetic field is supplied to generate heat and which heats a developer on a material to be recorded, a plurality of coil bodies which generate an induced heat in the body to be heated from the outside of the body to be heated and which include litz wires having cross sections formed in rectangular shapes and which are disposed in a longitudinal direction of the body to be heated, and a pressure applying member which contacts the body to be heated in a predetermined position and which fixes the developer on the material to be recorded passing between the pressure applying member and the body to be heated.

Abstract: A distance defined by expression 2 is secured between the exciting coil and the protection cover. This not only prevents a magnetic field with a specific magnetic field intensity or higher from leaking to the outside but also reduces the effect on the circuits in the apparatus or optionally installed circuits (including a printer controller and a FAX controller).

Abstract: According to one aspect of the present invention, there is provided a fixing apparatus having a non-contact temperature detecting unit which detects temperature by sensing infrared rays emitted from the a heating roller and a difference between real temperature and the temperature detected by the non-contact temperature detecting unit, produced by time-lag until reaching the infrared rays emitted from the heating roller is corrected.

Abstract: The present invention relates to a heat generator including a central shaft, an elastic body formed to be a predetermined thickness at a circumference of the central shaft, a conductor layer formed to be a predetermined thickness at a circumference of the elastic body, and a second elastic body formed to be a predetermined thickness at a circumference of the conductor layer, and an apparatus including a magnetic field generator which provides a magnetic field such that the conductor layer of the heat generator can generate heat, and a pressure member which is provided along the central shaft of the heat generator, and applies pressure that deforms the elastic body layer by a predetermined amount to a predetermined position of the central shaft or the heating generator.

Abstract: In an image forming apparatus according to the present invention, a shield plate 202 which is made of a specific material and has a specific thickness is provided between an exciting coil and at least one of a first and a second magnetic field intensity measuring point P1, P2, which prevents a magnetic field of a specific magnetic field intensity or higher from leaking to the outside of the image forming apparatus or alleviates the effect of the magnetic field on the circuits in the apparatus or optionally installed devices.

Abstract: An excitation coil and/or a core member, which has a characteristic frequency other than frequencies used, is employed. Thereby, resonance is prevented between adjacent coils or between a coil and an adjacent component such as a core member.

Abstract: A CPU detects a temperature of a central part of a heating roller. If the detected temperature does not exceed 180° C., the CPU drives a central coil or a side-end coil for 0.4 second in accordance with a temperature difference between the central part of the heating roller and a side-end part of the heating roller. Then, the CPU drives the side-end coil or central coil for 0.2 second. Thereafter, the CPU detects the temperature of the central part and repeats the driving control until the detected temperature reaches 180° C.

Abstract: A fixing apparatus an aspect of the present invention includes, a heating object which generates the heat by a magnetic flux produced from a coil which generates a predetermined magnetic flux by electromagnetic induction in accordance with a frequency of an input current, and a pressurization mechanism which can provide a predetermined pressure to the heating object, and a coil of the heating object is formed of a litz wire obtained by twisting the number of conductors having a small cross section which are not affected by the skin effect caused due to the frequency of the input current, the number of which allows passage of a quantity of current to be inputted.

Abstract: A fixing device of the present invention has first and second thermistors which detect the temperatures at predetermined positions in the longitudinally direction of a heating roller, first and second coils which can increase independently the temperatures at the center and the end of the heating roller, a driving circuit which supply power alternately to the coils, first and second switching circuits which supply a predetermined power to each coil, a control unit, and a temperature detection circuit.

Abstract: A heat roller is configured to have a heat insulating member 4 and a metal member formed on the heat insulating member. Coils 21, 22 and 23 are provided outside the heating roller 2 to induction-heat the heating roller 2.

Abstract: A fixing apparatus includes a fixing device configured to, by allowing a sheet having a developing agent image on it to pass between a heating roller and a pressing roller set in contact with the heating roller, fix the developing agent image in which at least one of the heating roller and pressing roller is configured to have an inner elastic layer and a conductive layer formed on a surface side of the elastic layer and the elastic layer is bonded to the conductive layer by a heat-resistant adhesive having a heat-resistant temperature of over 200° C.