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: 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: The present invention aims to reduce the time period of the start up operation of an image forming apparatus corresponding to an image forming apparatus operating environment. The present invention provides an image forming apparatus includes an image bearing member; a toner image forming unit for forming a toner image on the image bearing member; an image condition detection member for detecting an image condition of the image bearing member; a setting unit for setting a plurality of toner image forming conditions determined based on the output of the image condition detection member; an environment detection member for detecting an environment condition of outside air of the image forming apparatus; and a selection unit for selecting the toner image forming conditions set by the setting unit based on the output of the environment detection device from when the power is turned on to when transitioned to an image formable state.

Abstract: An image heating apparatus includes a coil for generating a magnetic flux by a current flowing therethrough; an image heating member having an electroconductive layer in which an eddy current is produced by the magnetic flux by which heat is generated, the image heating member being effective to heat an image on a recording material; an electroconductive magnetic flux adjusting member movable from a first position and a second position to decrease the eddy current produced in the image heating member by the magnetic flux; a temperature sensor for sensing a temperature of image heating member; electric power control means for control electric power supplied to the coil on the basis of an output of the temperature sensor, wherein the electric power control means changes an electric power condition to be supplied to the coil before start of the movement from the first position to the second position of magnetic flux adjusting member.

Abstract: An image heating apparatus includes a coil for generating a magnetic flux by current flowing therethrough; an image heating member for heating an image on a recording material which is fed therethrough, the image heating member producing heat by eddy current generated by the magnetic flux; electric power supply control means for controlling electric power supply to the coil so as to provide the image heating member with a predetermined temperature; magnetic flux adjusting means for adjusting a magnetic flux in a direction perpendicular to a feeding direction of the recording material, the magnetic flux adjusting means having a first magnetic flux adjusting portion for reducing, by relative movement thereof relative to the coil, a magnetic flux directing toward an end of the image heating member adjacent to a sheet feedable range with respect to the direction, and a second magnetic flux adjusting portion for reducing, by relative movement thereof relative to the coil, a magnetic flux directing toward the image

Abstract: An image heating apparatus includes a heating rotatable member for heating an image on a recording material in a heating nip; magnetic flux generating means for generating a magnetic flux for induction heat generation in the heating rotatable member; magnetic flux confining means for confining the magnetic flux directed toward a predetermined region of the heating rotatable member from the magnetic flux generating means; and moving means for repeatedly moving the magnetic flux confining means 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: 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: An image forming apparatus includes image forming means for forming an image on a recording material; a heating rotatable member for heating the heating nip on the upper in a heating nip; magnetic flux generating means for generating a magnetic flux for induction heat generation in the heating rotatable member; control means for controlling a temperature of the heating rotatable member; temperature detecting means for detecting a temperature of the heating rotatable member at a predetermined region; magnetic flux confining means for confining the magnetic flux directed toward the predetermined region of the heating rotatable member from the magnetic flux generating means in accordance with an output of the temperature detecting means; and moving means for movement the magnetic flux confining means between a magnetic-flux-confinement position and a non-magnetic-flux-confinement position, wherein when the output of the temperature detecting means indicates a temperature outside a predetermined temperature range

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: Information on a temperature of a heat generation member 7 at a position which is in the neighborhood of an end portion of a conveyance area of a material S, 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 detection means 22 and 23, and a change means 171 lowers a target temperature of the heat generation member 7 depending on a detection result of the temperature information detection means. Thereafter, when the detection result of the temperature information detection means reaches a predetermined temperature, a magnetic flux adjusting member 18 is started to be moved by a moving means 21.

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: In a widthwise direction of a heating roller perpendicular to a sheet conveyance direction, an amount of magnetic flux acting on the heating roller in the neighborhood of an end portion of the heating roller is larger than that at a center portion of the eating roller, so that it is possible to prevent a lowering in temperature at the heating roller end portion. Further, in a temperature range in which a temperature of the heating roller is higher than a fixation temperature and is lower than a heat-resistant temperature of a heating apparatus, the heating roller has a temperature area in which a resistance thereof is lowered, so that it is possible to reduce temperature rise in a differential area between a large-sized sheet passing area and a small-sized sheet passing area when a sheet having a size smaller than a maximum size (non-sheet passing portion temperature rise).

Abstract: A method of manufacturing a honeycomb structure of the present invention is a method of obtaining a honeycomb structure 10 having a predetermined shape by processing a peripheral portion of a crude honeycomb structure 2, the method being characterized in that the peripheral portion of the crude honeycomb structure 2 is processed by a cutter having linear cut-off device. It is possible to effectively manufacture a honeycomb structure suitably used in a carrier for a catalyst having a catalytic action, for use in internal combustion engine, boiler, chemical reactor, reformer for fuel cell, etc., or as a filter for trapping particulate matter present in an exhaust gas by the method at low cost.

Abstract: In an optical disc recording/reproducing apparatus having a device for seeking a predetermined position on a postscript type optical disc, a device for reading recorded data from the disc, and a device for recording data and a time table on predetermined data area and table area of the disc, respectively, a method of recording the time table comprising the steps of: reading position data corresponding to a position of each recorded data on the disc; detecting remaining data area on which no data is recorded; dividing the remaining data area into a plurality of small areas; and recording the position data of each recorded data and each small area on the time table area.

Abstract: A video camera capable of photographing in a moving image mode and a still image mode comprises a mechanical shutter provided near the front surface of an image pickup device and a detector provided with an image pickup signal according to the state of the mechanical shutter. A controller receives an output of the detector. The controller includes a filter and a filter controller for controlling the time constant of the filter. The time constant of the filter is decreased by the filter controller when a control signal for the video camera is generated.

Abstract: In a reproducing system, a reproducing start position of recording information is set in a first reproducing device reproducible in a second reproducing device. The reproducing start position set in the first reproducing device is stored in a detachable external storage medium. The external storage medium is detached from the first reproducing device, attached to a second reproducing device, and the reproducing start position stored in the external storage medium is read into the second reproducing device. Thus the reproducing start position set by the first reproducing device will be reproduced in the second reproducing device to control a location of selection, such as musical numbers.

Abstract: A video signal processing circuit includes a level shifter for shifting the dc level of an input luminance signal; a gain adjuster for increasing the gain for the luminance signal when the luminance signal has a low luminance level and for decreasing the gain for the luminance signal when the luminance signal has a high luminance level; and a shifting amount setting unit for setting the amount for shifting the dc level on the basis of the frequency distribution of the luminance signal and the rate of modulation of the luminance signal.

Abstract: A switching circuit to selectively generate either one of an image pickup signal from an image pickup device and a reproduction video signal in which when the recording mode is set, the switching circuit is set to the side on which the image pickup signal from the image pickup device is supplied. When the reproducing mode is set, the switching circuit is set to the side on which the reproduction video signal is supplied. When the instantaneous reproduction is executed in the recording mode, the optical information from an optical information detecting circuit just before the switching circuit is switched from the side on which the image pickup signal is supplied to the side on which the reproduction video signal is supplied is held. An output of the switching circuit is converted into a digital signal. The digital signal is supplied to a digital signal processing circuit to process the digital signal and is also supplied to the optical information detecting circuit to detect the optical information.

Abstract: An exposure correcting loop detects an image pickup signal level and controls a gain of an AGC amplifier and/or an opening of an iris in accordance with the image pickup signal level. A flicker cancelling loop has a flicker detector and detects a flicker component level in the image pickup signal and controls the gain of the AGC amplifier and/or the opening of the iris so that the flicker component level is cancelled. The exposure correcting loop and flicker detector are independent systems.

Abstract: An exposure control apparatus includes a control amount converting table for storing data on a gain control amount associated with data on a detected quantity of incident light. On the basis of an output from the control amount converting table, light quantity gains of light quantity variable means, such as an iris, a shutter, an AGC amplifier, and so forth, are set. The level of a quantity of incident light coming through these light quantity variable means is detected, and the detected data is fed to correcting means. The correcting means corrects an error between data on the control amount of the light quantity gain output from the control amount converting table and an actual light quantity gain of the light quantity variable means. An output from the correcting means is fed to the control amount converting table.