Patent application number | Description | Published |
20090263170 | FIXING DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE SAME - A fixing device includes a fixing belt for fixing an unfixed toner image onto a recording medium, a planar heating member for heating the fixing belt, and a pressure roller. The heating member includes a ceramic heat generating element having a PTC characteristic, and a high-thermal-conductive heat diffusion member. The fixing belt is formed in an endless shape and is supported around, at least, the high-thermal-conductive heat diffusion member, thereby to be heated. The ceramic heat generating element comes into contact with the fixing belt over the full width thereof with the high-thermal-conductive heat diffusion member interposed therebetween. The high-thermal-conductive heat diffusion member comes into contact with the fixing belt over the full width thereof and diffuses heat generated by the heat generating element, in the traveling direction of the fixing belt. | 10-22-2009 |
20090311008 | ION GENERATING ELEMENT, CHARGING DEVICE, AND IMAGE FORMING APPARATUS - In an ion generating element, (i) an induction electrode and a heater electrode are provided away from each other on one surface of an insulating base material such that the induction electrode and the heater electrode are insulated from each other, (ii) a dielectric layer is provided on the surface of the insulating base material, and (iii) the dielectric layer has a length covering the insulating base material and the dielectric layer has openings above a ground terminal of the induction electrode and above a ground terminal and a power supply connection terminal of the heater electrode so that the terminals are exposed. As a result, it is possible to provide an ion generating element for generating ions along with creeping discharge, a charging device, and an image forming apparatus, each of which can be produced at low costs and prevent damages when unexpected troubles occur, and each of which is excellent in terms of safety. | 12-17-2009 |
20090311015 | FIXING DEVICE AND IMAGE FORMING APPARATUS - In a fixing device including a fixing roller, a pressure roller and an external heating section, a scraper is arranged to contact a circumferential surface of an external heating belt and scrape toner and the like on the circumferential surface to thereby clean the circumferential surface. In addition, a material that has higher adherence to toner than on a circumferential surface of the fixing roller is used for the external hating belt to thereby peel the toner and the like on the circumferential surface of the fixing roller and clean the circumferential surface of the fixing roller. Further, as a vibration applying section adapted to apply vibration to the scraper, a first contact/separation section adapted to contact/separate the external heating section with/from the fixing roller is provided. Vibration is applied to the scraper by the first contact/separation to peel the toner and the like off the scraper. | 12-17-2009 |
20100054788 | FIXING DEVICE, IMAGE FORMING APPARATUS EQUIPPED THEREWITH, AND RECORDING MEDIUM ON WHICH TEMPERATURE CONTROL PROGRAM IS RECORDED - A fixing device which can reduce an overshoot of the surface temperature of a main heating section without lengthening a warming-up period of time, an image forming apparatus equipped therewith, and a recording medium on which is recorded the temperature control program are provided. In a standby mode, control is performed to stop an operation of a halogen lamp which is an internal heat source, when a surface temperature of a heating roller reaches a certain temperature lower than a target temperature, or when the operating period of time of the halogen lamp reaches a certain period of time. By so doing, as the heating roller ceases to be heated at a point at which it reaches a temperature lower than the target temperature, it is possible to reduce the overshoot of the surface temperature of the heating roller. | 03-04-2010 |
20100061778 | FIXING APPARATUS AND IMAGE FORMING APPARATUS - Provided is a fixing apparatus employing an external heating method in which a scratch on a belt member and slippage of the belt member are prevented. The fixing apparatus includes: a fixing roller; a pressure member pressed against the fixing roller; an endless belt which is rotatably supported and contacts the fixing roller surface for heating the fixing roller; and heating means for heating the endless belt. By passing a recording material through a nip between the fixing roller and the pressure member, the fixing apparatus fixes an unfixed toner image on the recording material on which the unfixed toner image is transferred. The fixing apparatus further includes a cleaning member for removing dirt adhered to a surface of the endless belt by contacting the surface of the endless belt in a region where the endless belt is not supported. | 03-11-2010 |
20100142988 | FIXING DEVICE, IMAGE FORMING APPARATUS, AND METHOD FOR CONTROLLING FIXING DEVICE - In a fixing device including (i) an external heat belt which abuts against a surface of a fixing roller so as to heat the fixing roller and (ii) a cleaning member which abuts against the external heat belt, a fixing temperature, which is a surface temperature of the fixing roller during a fixing process, is set per group into which recording media to be subjected to the fixing process are divided according to their widths in a direction of a rotary axis of the fixing roller, in such a way that the fixing temperature is set to a lower temperature for a group of narrower widths. This makes it possible to prevent a reduction in releasability of the fixing roller caused by a material, which is scraped off from the external heat belt by the cleaning member and then adhered to the fixing roller, thereby preventing the high-temperature offset. | 06-10-2010 |
20100183345 | FIXING DEVICE AND IMAGE FORMING APPARATUS HAVING SAME - A fixing device of the present invention includes: an external heating belt which is to contact with a surface of a fixing roller so as to heat up the fixing roller; and a cleaning member (a scraper and/or cleaning pad) which is to contact with the external heating belt. The cleaning pad which is impregnated with silicone oil is to contact with a surface of the external heating belt, thereby applying the silicone oil (release agent) to the surface of the external heating belt. This makes it possible to prevent generation of an offset. | 07-22-2010 |
20100183346 | FIXING DEVICE AND IMAGE FORMING APPARATUS HAVING SAME - No covering layer is provided onto that abutting surface of an external heating belt which has contact with a cleaning member. Accordingly, a belt substrate is exposed and has contact with the cleaning member. This suppresses the occurrence of offset in a fixing device including (i) the external heating belt for having contact with the surface of the fixing roller so as to heat a fixing roller, and (ii) the cleaning member having contact with the external heating belt. | 07-22-2010 |
20100209131 | FIXING DEVICE, IMAGE FORMING APPARATUS, RECORDING MEDIUM RECORDING CONTROL PROGRAM FOR REALIZING FIXING DEVICE AND CONTROL METHOD FOR FIXING DEVICE - A fixing device is provided. A fixing device includes a heating section that has a heat source comprised of a ceramic heat generating element that generates heat by electric power supply and has a positive temperature coefficient property. Then, in the heating section, an applied voltage value by a voltage variable power source to the ceramic heat generating element is variably controlled by a control unit such that an input power value in the ceramic heat generating element is approximately constant. | 08-19-2010 |
20100254738 | IMAGE RECORDING MEDIUM, IMAGE RECORDING MEDIUM REUSING APPARATUS, IMAGE FORMING APPARATUS USING THE SAME AND IMAGE RECORDING MEDIUM REUSING METHOD - An image recording medium that can be repeatedly used by removing the toner image has a three-layered structure formed of a heat-resistant resin sheet and a pair of releasing and light absorptive layers coated on both sides of the heat-resistant resin sheet. The releasing and light absorptive layer generates heat by absorbing laser so as to fuse and fix the toner image formed on the special sheet surface at the time of image forming, and assures pertinent releasing performance at the time of image removal so as to facilitate removal of the re-fused toner image. The image recording medium may have a five-layered structure in which each releasing and light absorptive layer is split into a light absorptive layer and a releasing layer. The image recording medium may have a three-layered structure formed of a light absorptive and heat-resistant resin sheet that is produced by adding an infrared absorbent to a heat-resistant resin sheet to serve as a heat-resistant sheet and a light absorptive layer, and a pair of releasing layers formed on both sides of the light absorptive and heat-resistant resin sheet. | 10-07-2010 |
20100266307 | FIXING DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE FIXING DEVICE - A fixing device using a belt fixing method includes a fixing belt which satisfies 42.2≧ER≧0.1044×D×μ | 10-21-2010 |
20110052279 | FIXING DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE SAME - A fixing device of this invention includes: a fixing belt; a heating member for heating the fixing belt; a retaining member having (i) a convex surface which is curved and is in contact with an inner surface of the fixing belt and (ii) a flat surface which is opposite to the convex surface; and a ceramic heater provided on the flat surface of the retaining member. Therefore, the fixing device of this invention is excellent in safety and is capable of reducing a warm-up time. | 03-03-2011 |
20110058869 | LASER FIXING DEVICE - A laser fixing device, which is for use in an electrophotographic image forming apparatus, including: a carrying device for carrying a sheet; and a laser array section which is made up of a plurality of laser sources arrayed in a line, the plurality of laser sources irradiating a non-fixed toner image, which is attached to the sheet that is being carried by the carrying device, with a laser beam so that the non-fixed toner image is fused and fixed to the sheet. In the laser fixing device, an irradiation region length and a sheet carrying speed are set so that tn≧0.259·mt | 03-10-2011 |
20110142472 | FIXING DEVICE, IMAGE FORMING APPARATUS, AND TEMPERATURE CONTROL METHOD FOR FIXING DEVICE - First, a first temperature difference and a second temperature difference are calculated. The first temperature difference is a difference between (a) a first detected temperature that is a current temperature of the fixing member and (b) a difference of a control target temperature for the fixing member. The second temperature difference is a difference between (a) the first detected temperature and (b) a past temperature of the fixing member which past temperature was detected a predetermined time earlier than the current time. Then, by reading out, from a table prepared in advance, an amount of power to be supplied to a heating member which amount corresponds to a combination of the first temperature difference and the second temperature difference, the amount of power to be supplied to the heating member is determined. In accordance with this amount of power determined, an actual amount of power supplied to the heating member is controlled. This makes it possible to simply and effectively suppress a temperature ripple of the fixing member. | 06-16-2011 |
20110188904 | FIXING DEVICE AND IMAGE FORMING APPARATUS USING THE SAME - A fixing device includes a fixing portion provided with a fixing roller, a heating roller and a fixing belt; a pressing roller that presses a recording sheet to the fixing belt; a cleaning unit provided with a cleaning web that cleans up the pressing roller; and contact/separation mechanism that separates fixing means from the pressing roller. Viscosity of silicone oil that impregnates the cleaning web is set to 3,000 cs or more, and the contact/separation mechanism separates the fixing belt from the pressing roller at the time of rotation operation before fixation. | 08-04-2011 |
20110236048 | IMAGE FORMING APPARATUS - An image forming apparatus is provided. The image forming apparatus includes an image forming section, an intermediate transfer section, a secondary transfer section, a fixing section, a power source, a voltage detection section, a temperature detection section, and a fixing section control circuit. The fixing section control circuit includes a switching control section, a voltage judgment section, a temperature judgment section, and a preparation control section. When the switching control section switches the current conduction state to the heat source and the driving section from an off conduction state to an off conduction state and the voltage judgment section judges to be less than a threshold voltage, the preparation control section controls the preparation operation of the heating section such that the switching control section continues the on conduction state over a given idle time after the temperature judgment section has judged to be a preset temperature or higher. | 09-29-2011 |