Patent application number | Description | Published |
20090003868 | IMAGE FORMING APPARATUS - The image forming apparatus includes a current detection circuit for detecting an input current from the commercial power supply to the apparatus, in which: when a current detected by the current detection circuit exceeds a predetermined value, a maximum current suppliable to a fixing portion is restricted; and when a temperature of the fixing portion falls below, in a situation where the maximum current suppliable to the fixing portion is restricted, the predetermined temperature lower than a control target temperature, a conveyance interval of a recording material conveyed to the fixing portion is extended. In the image forming apparatus, even when a consumption current of the image forming apparatus is increased during successive image formation, it is capable of controlling the consumption current so as not to exceed a maximum current of a commercial power supply, securing desired fixability, and minimizing decline of image forming performance. | 01-01-2009 |
20100247131 | IMAGE FORMING APPARATUS - The image forming apparatus includes an image forming part, a fixing part including a heater and a temperature detection element; and a power-control part that controls power to be supplied to the heater according to the detection temperature of the temperature detection element, wherein during the power to be supplied to the heater is controlled so as to keep the detection temperature at a control target temperature, if the on-duty ratio selected so to keep the detection temperature at the control target temperature is a specific on-duty ratio and the specific on-duty ratio continues for a predetermined number of cycles, the power-control part switches to another control cycle different in the number of consecutive half-waves of the AC waveform from the control cycle. | 09-30-2010 |
20100310267 | IMAGE FORMING APPARATUS - A wave form corresponding to at least one power ratio among a plurality of power ratios set according to a temperature of a fixing part include a first group wherein a negative half-wave to at least partially turn on a half-wave and a positive-half-wave to at least partially turn on a half-wave continue in order after a half-wave to entirely turn off an one half-wave, and a second group wherein a positive-half-wave to at least partially turn on a half-wave continues just after a -half-wave to entirely turn off an one half-wave, thereby an accuracy of current detection can be improved. | 12-09-2010 |
20110280596 | HEATING APPARATUS AND IMAGE FORMING APPARATUS - The heating apparatus includes a first detection part which detects whether or not the power supplied to the heat generation member is in an overpower state by detecting a positive phase of a half wave in an alternating voltage of a commercial power supply applied to the first or the second current path of the heat generation member, a second detection part which detects whether the power supplied to the heat generation member is in an overpower state or not by detecting a negative phase of a half wave in an alternating voltage the commercial power supply applied to the first current path or the second current path of the heat generation member, and a control part which controls itself to stop supplying power from the commercial power supply to the heat generation member in a case where an overpower state is detected by the first or second detection part. | 11-17-2011 |
20110280597 | VOLTAGE DETECTION DEVICE AND IMAGE HEATING DEVICE - The voltage detection device includes a first voltage detection part for detecting whether or not a time period ratio during which a voltage of an AC power supply is equal to or larger than a first threshold value is equal to or larger than a first ratio and a second voltage detection part for detecting whether or not a time period ratio during which the voltage of the AC power supply is lower than the first threshold value and equal to or larger than a second threshold value is equal to or larger than a second ratio higher than the first ratio, and determines whether the voltage of the AC power supply is a first commercial voltage or a second commercial voltage lower than the first commercial voltage based on results obtained by the first voltage detection part and by the second voltage detection part. | 11-17-2011 |
20110305469 | HEATING APPARATUS AND VOLTAGE DETECTION APPARATUS - A voltage detection apparatus is configured to detect a voltage value applied to a first or second current path of a heater. The voltage detection apparatus detects a first period during which the voltage value of the first or second current path exceeds a threshold voltage as well as a second period during which electric power is supplied to the first current path or the second current path to control the electric power supplied to the first and second current paths. The voltage detection apparatus uses a detection result to detect a state where over-power is supplied to the heater. | 12-15-2011 |
20120000897 | IMAGE HEATING APPARATUS - The image heating apparatus includes first and heat generation member, a connection state switching section switching the first and second heat generation members between a serial connection state and a parallel connection state, the connection state switching section C having a first relay having a make contact or a break contact and a second relay having a transfer contact, a drive element provided used for controlling power supplied to the first and second heat generation members, and a capacitor between a power supply path closer to the side of the first and second heat generation members rather than the first relay and a power supply path closer to the commercial power supply side rather than the drive element. The image heating apparatus can suppress an increase in noise level of a noise terminal voltage by performing power control on the heater. | 01-05-2012 |
20120121306 | HEATER, IMAGE HEATING DEVICE WITH THE HEATER AND IMAGE FORMING APPARATUS THEREIN - The heater is capable of improving heat generation uniformity in a sheet feeding area while suppressing the temperature rise of a non-sheet feeding portion. Each of heat generation lines includes a plurality of heat blocks in which a plurality of heat generating resistors are electrically connected in parallel between two conductive members. The heat generation lines are arranged in a lateral direction of the substrate, and the heat blocks are arranged so that the end of the heat block in the heat generation line of a first row does not overlap with the end of the heat block in the heat generation line of a second row in a longitudinal direction of a heater. | 05-17-2012 |
20120148273 | IMAGE FORMING APPARATUS - An apparatus is capable of switching between a mode in which a first resistance heating element and a second resistance heating element are connected in series and a mode in which they are connected in parallel. When a temperature increase rate detected by a temperature detection unit is smaller than a threshold rate although a current detected by a current detection unit is greater than a threshold current, a notification of a failure is issued. | 06-14-2012 |
20120155895 | IMAGE FORMING APPARATUS - The present invention provides a low-cost and safe image forming apparatus that has a first state in which first and second resistance heating bodies of a heater are connected in series, a second state in which the first and second resistance heating bodies are connected in parallel, and a third state in which a first switching unit shuts off a power supply path and a second switching unit is connected to a first power source terminal to block power supply to the heater. | 06-21-2012 |
20120195129 | NONVOLATILE SEMICONDUCTOR MEMORY DEVICE - A control circuit controls various kinds of operations on the memory cell array. The control circuit executes a pre-erase stress application operation in which, when an erase operation on one of the memory cells is executed, prior to the erase operation, a first voltage belonging in a certain voltage range is applied to the control gate while a second voltage having a value smaller than a value of the first voltage is applied to the channel region, whereby a stress is applied to the memory cell due to a potential difference between the first voltage and the second voltage. | 08-02-2012 |
20120201581 | HEATER AND IMAGE HEATING APPARATUS HAVING THE HEATER INSTALLED THEREIN - The image heating apparatus includes first and second lines having a first and second heat generation blocks, the first and second lines being disposed at different positions in a transverse direction, wherein the first and second lines are arranged so that a whole of first heat generation block in the first line and a whole of second heat generation block in the second line overlap with each other in the longitudinal direction, and a whole of second heat generation block in the first line and a whole of first heat generation block in the second line overlap with each other in the longitudinal direction. By the virtue of the present invention, it achieves to be capable of suppressing a temperature rise in a non-sheet feeding area in a case of printing a sheet smaller in size than a maximum size supported by the image heating apparatus. | 08-09-2012 |
20120201582 | HEATER AND IMAGE HEATING APPARATUS INCLUDING SAME - The image heating apparatus includes a heater that achieves even heat-generation distribution and suppression of a non-sheet feeding portion temperature increase when an image is printed on a sheet whose size is smaller than a maximum size for the apparatus, and an endless belt, wherein plural heat-generation resistive members having positive temperature coefficients are connected in parallel are provided between first and second conductive members provided along a longitudinal direction of a substrate; plural heat-generation blocks including the plural heat-generation resistive members connected in parallel, are arranged in series along the longitudinal direction; and in the plural heat-generation resistive members included in one of the heat-generation blocks, a heat-generation resistive member arranged at an end portion in the longitudinal direction has a resistivity value higher than that of a heat generation resistive member arranged at a center in the longitudinal direction, or an interval between heat generation resistive members is larger in the end portion. | 08-09-2012 |
20120308252 | IMAGE FORMING APPARATUS - The image forming apparatus can be used in areas having different power supply voltages, in which a failure of the apparatus can be detected so that reliability of the apparatus is improved. The apparatus includes a connection state switching part which switches connection of a first heat generating member and a second heat generating member, which generate heat by electric power supplied from a commercial power supply through a power supply path, between a serial connection state and a parallel connection state, and a current detection part which detects current flowing in the power supply path. The current detection part is disposed in the power supply path after branching toward the first heat generating member and the second heat generating member in the parallel connection state. | 12-06-2012 |
20130070525 | NONVOLATILE SEMICONDUCTOR MEMORY DEVICE - A nonvolatile semiconductor memory device according to an embodiment includes a control circuit controlling a read operation of applying a read voltage to a selected memory cell to read data, and a write verify operation of applying a verify voltage to the selected memory cell. In a first case, the control circuit sets a voltage to a first write verify voltage and a first read voltage. In a second case in which the memory cells deteriorate more than in the first case, the control circuit sets a voltage to a second write verify voltage and a second read voltage. The control circuit sets a difference between a maximum value of the first write verify voltage and a maximum value of the first read voltage to be more than a difference between a maximum value of the second write verify voltage and a maximum value of the second read voltage. | 03-21-2013 |
20130148998 | POWER SUPPLY INCLUDING ZERO-CROSS DETECTION CIRCUIT, AND IMAGE FORMING APPARATUS - A power supply includes a first capacitor, a resistor for discharging an electric charge of the first capacitor and for detecting zero crossing of the AC voltage input from the AC power supply, a second capacitor, and a frame ground o and a discharge resistor having a resistance value smaller than the resistor and configured to discharge an electric charge of the second capacitor, and switches between a state where a current to the discharge resistor is cut off and a state where a current flows through the discharge resistor. | 06-13-2013 |
20130195497 | POWER SOURCE, POWER FAILURE DETECTION APPARATUS, AND IMAGE FORMING APPARATUS - A power source includes a rectifying unit configured to full-wave rectify an AC voltage to be input, a first and second converter configured to convert the voltage rectified by the rectifying unit, a zero cross detection unit configured to detect a zero cross of the AC voltage, a voltage detection unit configured to detect the AC voltage, a first capacitance element connected across a potential after being subjected to rectification by the rectifying unit and a ground, a first discharging resistor configured to discharge electric charges charged in the first capacitance element, a first switch unit configured to cut off a current flowing to the first discharging resistor and a stopping unit configured, in a case where the AC voltage is detected by the voltage detection unit and the detected voltage is smaller than a threshold value, to stop the operation of the second converter. | 08-01-2013 |
20130234225 | NONVOLATILE SEMICONDUCTOR MEMORY DEVICE - According to one embodiment, a nonvolatile semiconductor memory includes a gate insulating film, a floating gate, first and second silicon oxide films, an insulating film and a control gate. The floating gate is formed on the gate insulating film. The first silicon oxide film is formed on an upper surface of the floating gate. The insulating film is formed on the first silicon oxide film on the upper surface of the floating gate and has a dielectric constant higher than that of the silicon oxide film. The second silicon oxide film is formed on the insulating film on the upper surface of the floating gate and on a side surface of the floating gate. The control gate is formed on the second silicon oxide film formed on the upper and side surfaces of the floating gate. | 09-12-2013 |
20130266334 | IMAGE FORMING APPARATUS - Part of a plurality of power levels of control patterns selected to control power supplied from an AC power source to a heater of an image forming apparatus include power levels of a) waveforms in which power is supplied in part of negative and positive half cycles in order after no power supply during a one half of a positive half cycle, and waveforms in which power is supplied in part of a positive cycle after no power supply during one half of a negative half cycle, or b) waveforms in which power is supplied in part of positive and negative half cycles in order after no power supply during one half of a negative half cycle, and waveforms in which power is supplied in part of a negative half cycle after no power supply during one half of a positive half cycle. | 10-10-2013 |
20130272738 | IMAGE FORMING APPARATUS - One disclosed aspect of the embodiments relates to power control of a heater in a fixing unit. A plurality of control tables having different ratios of phase control waveforms and wave number control waveforms in one control cycle have been set, and a control table is selected depending on a set target temperature. | 10-17-2013 |
20130343790 | HEATER AND IMAGE HEATING DEVICE HAVING SAME HEATER - The present invention is directed to providing a heater in which uniformity of a temperature distribution in a widthwise direction of the heater can be improved while inhibiting a temperature rise of a non-sheet-passing part, and an image heating device equipped with the heater. In a first heat-generation line and a second heat-generation line, a plurality of heat-generation resistors including positive resistance-temperature characteristics between two electro-conductive elements provided on a substrate along the lengthwise direction of the substrate are connected in parallel. The first heat-generation line and the second heat-generation line are connected in parallel. | 12-26-2013 |
20130343791 | HEATER AND IMAGE HEATING DEVICE INCLUDING THE SAME - In order to suppress excessive temperature rise at a non-sheet-passing region while suppressing the deterioration of fixability in case of heating small size sheets, a heater includes a first heat-generation line and a second heat-generation line, which are independently controllable, wherein the first heat-generation line is configured so that a plurality of heat-generation resistors having positive resistance-temperature characteristics is electrically connected in parallel to each other between a first electro-conductive element and a second electro-conductive element, and the heat-generation resistors are adjusted so that a heat-generation amount per unit length of the first heat-generation line in a lengthwise direction of the heater decreases from a recording material conveyance reference towards a end portion in the lengthwise direction, and an image heating device having the heater. | 12-26-2013 |
20140076878 | HEATER AND IMAGE HEATING DEVICE MOUNTED WITH HEATER - A heater of the present invention includes jointed heat generating resistors having a positive temperature characteristic of resistance and provided between a first conductive element and a second conductive element on a substrate in a longitudinal direction of the substrate, and a plurality of heating blocks provided in the longitudinal direction, each of which is a set of the first conductive element, the second conductive element, and the heat generating resistor, and power supplied to at least one of the plurality of heating blocks can be controlled independent of other heating blocks. | 03-20-2014 |
20140110394 | HEATER AND IMAGE HEATING APPARATUS HAVING THE HEATER INSTALLED THEREIN - The image heating apparatus includes first and second lines having a first and second heat generation blocks, the first and second lines being disposed at different positions in a transverse direction, wherein the first and second lines are arranged so that a whole of first heat generation block in the first line and a whole of second heat generation block in the second line overlap with each other in the longitudinal direction, and a whole of second heat generation block in the first line and a whole of first heat generation block in the second line overlap with each other in the longitudinal direction. By the virtue of the present invention, it achieves to be capable of suppressing a temperature rise in a non-sheet feeding area in a case of printing a sheet smaller in size than a maximum size supported by the image heating apparatus. | 04-24-2014 |
20140169811 | IMAGE FORMING APPARATUS - There is disclosed an image forming apparatus where at suitable positions in a power supply path of a first heat generating member and a second heat generating member which can be switched to a series connection condition and a parallel connection condition, there are arranged a current detection section including a circuit which detects a current subjected to rectification of a positive half wave and a circuit which detects a current subjected to rectification of a negative half wave, and an applied voltage detection section including a circuit which detects a voltage subjected to full-wave rectification. Consequently, in the image forming apparatus which can be used in districts using different power supply voltages, failure of the apparatus can be detected, and reliability of the apparatus can be enhanced. | 06-19-2014 |
20140169845 | FIXING DEVICE AND HEATER USED IN FIXING DEVICE - A heater used for a fixing device includes a substrate, first and second conductor patterns formed at either end of the substrate in the short direction of the substrate, a third conductor pattern formed between the first and second conductor patterns and separated from the two conductor patterns, a first heating member disposed between the first and third conductor patterns and electrically connected to the two conductor patterns, and a second heating member disposed between the second and third conductor patterns and electrically connected to the conductor patterns. The heater has both end regions in which the widths of the third conductor pattern in the short direction is smaller than that of a middle portion of the third conductor pattern. The widths of the first and second heating members in the end regions are smaller than the widths of the first and second heating members in the other region, respectively. | 06-19-2014 |
20140169846 | HEATER, IMAGE HEATING DEVICE WITH THE HEATER AND IMAGE FORMING APPARATUS THEREIN - The heater is capable of improving heat generation uniformity in a sheet feeding area while suppressing the temperature rise of a non-sheet feeding portion. Each of heat generation lines includes a plurality of heat blocks in which a plurality of heat generating resistors are electrically connected in parallel between two conductive members. The heat generation lines are arranged in a lateral direction of the substrate, and the heat blocks are arranged so that the end of the heat block in the heat generation line of a first row does not overlap with the end of the heat block in the heat generation line of a second row in a longitudinal direction of a heater. | 06-19-2014 |
20140193182 | HEATER AND IMAGE HEATING APPARATUS INCLUDING SAME - The image heating apparatus includes a heater that achieves even heat-generation distribution and suppression of a non-sheet feeding portion temperature increase when an image is printed on a sheet whose size is smaller than a maximum size for the apparatus, and an endless belt, wherein plural heat-generation resistive members having positive temperature coefficients are connected in parallel are provided between first and second conductive members provided along a longitudinal direction of a substrate; plural heat-generation blocks including the plural heat-generation resistive members connected in parallel, are arranged in series along the longitudinal direction; and in the plural heat-generation resistive members included in one of the heat-generation blocks, a heat-generation resistive member arranged at an end portion in the longitudinal direction has a resistivity value higher than that of a heat generation resistive member arranged at a center in the longitudinal direction, or an interval between heat generation resistive members is larger in the end portion. | 07-10-2014 |
20140294416 | IMAGE FORMING APPARATUS - An apparatus is capable of switching between a mode in which a first resistance heating element and a second resistance heating element are connected in series and a mode in which they are connected in parallel. When a temperature increase rate detected by a temperature detection unit is smaller than a threshold rate although a current detected by a current detection unit is greater than a threshold current, a notification of a failure is issued. | 10-02-2014 |
20140308051 | HEATING APPARATUS AND IMAGE FORMING APPARATUS - The heating apparatus includes a first detection part which detects whether or not the power supplied to the heat generation member is in an overpower state by detecting a positive phase of a half wave in an alternating voltage of a commercial power supply applied to the first or the second current path of the heat generation member, a second detection part which detects whether the power supplied to the heat generation member is in an overpower state or not by detecting a negative phase of a half wave in an alternating voltage the commercial power supply applied to the first current path or the second current path of the heat generation member, and a control part which controls itself to stop supplying power from the commercial power supply to the heat generation member in a case where an overpower state is detected by the first or second detection part. | 10-16-2014 |
20150063032 | NONVOLATILE SEMICONDUCTOR MEMORY DEVICE AND METHOD OF CONTROLLING THE SAME - This nonvolatile semiconductor memory device comprises: a word line connected to a control gate; a bit line electrically connected to one end of a NAND cell unit; a source line electrically connected to the other end of the NAND cell unit; and a control circuit that controls a voltage applied to a semiconductor layer, the control gate, the bit line, and the source line. | 03-05-2015 |