| Patent application number | Description | Published |
|---|
| 20090074442 | Image forming apparatus and method of controlling the same - A control unit controls supply of power to a plurality of heating units at predetermined control period T | 03-19-2009 |
| 20090238595 | Fixing device, image forming apparatus, and fixing-device control method - In a fixing device, a fixing unit fixes a toner image transferred onto a recording medium by a heating target unit heated by a plurality of heating units each of which is grouped as a first heating unit to which power is selectively supplied or a second heating unit to which power is supplied in priority to the first heating unit, and a supply control unit supplies power to a heating unit grouped as the second heating unit and selectively supplies power to a heating unit grouped as the first heating unit, among the heating units that heat the heating target unit of which detected temperature by a detecting unit is lower than a target temperature. | 09-24-2009 |
| 20100239301 | HEATER CONTROL WITH VARYING CONTROL CYCLE AND LIGHTING PATTERN - A heater controlling apparatus for controlling supply of alternating current power to at least one heater that heats a heating object includes a detection unit configured to detect a temperature of the heating object, a determining unit configured to determine a proportion of lighting time for lighting the heater based on the detected temperature and a preset target temperature of the heating object, and a control unit configured to control the supply of alternating current power to the heater based on both a control cycle and one or more lighting patterns, the heater being lit according to the one or more lighting patterns defined for each control cycle, and both the control cycle and the lighting pattern varying in response to the determined proportion of lighting time. | 09-23-2010 |
| 20100322656 | IMAGE FORMING APPARATUS AND HEATER CONTROL METHOD - An image forming apparatus includes a halogen heater in a fixing unit; an AC source applying an alternating voltage to the halogen heater; a half-wave control unit that performs the heater half-wave control to control the halogen heater on the half-wavelength basis, according to a heater-on/off pattern set for each control cycle having a predetermined length; a heater-off-time measuring unit that measures heater-off period of time; a phase-control-execution determining unit that determines, based on the measured heater-off period of time, whether the heater phase control is to be performed on the alternating voltage, the phase control being performed by shifting phase of the alternating voltage; and a phase control unit that performs, when the phase control is determined to be performed, the phase control only for a period of time depending on the measured heater-off period of time after switch-on of the heater and before execution of the half-wave control. | 12-23-2010 |
| 20110064444 | HEATER CONTROL DEVICE, IMAGE FORMING APPARATUS, AND COMPUTER PROGRAM PRODUCT - A heater control device includes a temperature detector that detects a temperature of a heated object heated by a heater; an alternating-current power supply for applying an alternating current voltage to the heater; a turn-on ratio decision unit that determines a turn-on ratio of the heater based on the temperature and a target temperature; a turn-on pattern decision unit that determines a partial turn-on pattern, as the turn-on pattern of the heater, which is a pattern of a turn-on ratio higher than the determined turn-on ratio in terms of a control-period, and to which a partial turn-on instead of a full turn-on is allocated on a half-wavelength basis of the alternating current voltage within the control period based on the turn-on ratio of the heater; and a turn-on controller that controls turn-on of the heater based on the determined turn-on pattern. | 03-17-2011 |
| Patent application number | Description | Published |
|---|
| 20080283736 | OPTICAL ENCODER AND ELECTRONIC EQUIPMENT HAVING THE SAME - In the optical encoder, the DC signal to be subjected to comparison is one for the first AC signal outputted from the second current-voltage converting part and the second AC signal outputted from the fourth current-voltage converting part, so that the DC signal is used in common. Therefore, it becomes possible to reduce the light-receiving area for the DC signal. In concrete, a total (⅝)P of the widths (⅛)P of the first through fifth light-receiving elements can be made narrower than one pitch P of the moving object. Moreover, by using in common the DC signal that becomes a comparison signal, the influences of the scattering, variation and so on of light can be reduced, and variations in the signals outputted from first and second differential amplifiers that constitute the comparing parts can be reduced. | 11-20-2008 |
| 20080315135 | OPTICAL ENCODER AND ELECTRONIC EQUIPMENT - This optical encoder includes a light emitting section and a plurality of light receiving elements placed so as to be aligned in one direction in an area where a light beam from the light emitting section may reach. A moving object includes a light-ON section, a light-OFF section and an index pattern section. The light receiving element outputs a first light receiving signal when the light-ON section and the light-OFF section of the moving object pass through a predetermined position corresponding to the light receiving element. The light receiving element outputs a second light receiving signal when the index pattern section of the moving object passes through a predetermined position corresponding to the light receiving element. The output section outputs an incremental channel signal indicating movement information of the moving object based on the first light receiving signal while outputting an index channel signal indicating reference position of the moving object based on the second light receiving signal. The incremental channel signal and the index channel signal are out of phase with each other. | 12-25-2008 |
| 20090008537 | OPTICAL ENCODER AND ELECTRONIC EQUIPMENT - This optical encoder includes a light emitting section and a plurality of light receiving elements placed so as to be aligned in one direction in an area where a light beam from the light emitting section may reach. The moving object includes a light-ON section and a light-OFF section. The light receiving element detects movement of the moving object when the light-ON section and the light-OFF section of the moving object pass through a predetermined position corresponding to the light receiving element A light receiving signal processing section receives inputs of a plurality of light receiving signals with different phases from a plurality of the light receiving elements, performs signal processing including at least one signal processing among a logical operation processing, an addition processing, and a subtraction processing on a plurality of the light receiving signals, and outputs an output signal containing a plurality of signal components which are different in phase and different in signal level with respect to a predetermined threshold level. | 01-08-2009 |
| 20090072129 | OPTICAL ENCODER AND ELECTRONIC EQUIPMENT HAVING THE SAME - An optical encoder of the invention has an OR circuit 21 to which light reception signals A+, B+ are inputted, an OR circuit 22 to which light reception signals A−, B− are inputted, and an AND circuit 23 to which an output signal C of the OR circuit 21 and an output signal D of the OR circuit 22 are inputted. In this optical encoder, a light reception signal A− shifted in phase by 180° from the light reception signal A+, and a light reception signal B− shifted in phase by 180° from the light reception signal B+, are inputted to the OR circuit 22 of the signal processing circuit 15. Thus, the signal processing circuit 15 does not need NOT circuits for inverting the light reception signal A+ and B+. This optical encoder can avoid occurrence of phase differences due to gate delay among signals and detect the mover with signals of excellent duty and periodic precisions. | 03-19-2009 |
