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21. 发明专利

JPH08248811A ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH08248811A
公开(公告)日：1996-09-27
申请号：JP5396695
申请日：1995-03-14
申请人： HITACHI LTD
发明人： MATSUO KAZUYOSHI , FUKAZAWA NOBUAKI
IPC分类号： G03G15/20 , G05D23/19 , H05B3/00
摘要： PURPOSE: To improve accuracy for controlling a fixing temperature and to make an image quality stable by predicting a state before inputting of a power source from the surface temperature state of a fixing roller, a stored content and a temperature increase time and determining a control method immediately after inputting of power based on the prediction. CONSTITUTION: A fixation device control circuit stores a plurality of control points T1 to T6 with specified temperatures allocated thereto by a CPU 14 and controls a heating means at a control point T4 mainly while a temperature in a machine is stable. However, since the surface temperature of a fixing roller becomes high immediately after this is started when switching on/off of heating means 16 and 17 is controlled only at this control point in an unstable region, a roller surface temperature is made stable by switching a control point to T3 and T4 in the unstable region. For corrections by switching among the control points T1 to T6 in stages, control is performed by determining the operational state of the device thus far, that is, a control point from a state before inputting of power and a current temperature state. For example, when a state is lower than T1 in the case of turning a power source on, a state before inputting of power is predicted by calculating a temperature increase time until T2.

22. 发明专利

JP2003195202A MULTI-BEAM OPTICAL SCANNER, MULTI-BEAM OPTICAL SCANNING METHOD, IMAGE FORMING DEVICE AND IMAGE FORMING METHOD 审中-公开
公开(公告)号：JP2003195202A
公开(公告)日：2003-07-09
申请号：JP2001397690
申请日：2001-12-27
申请人： HITACHI LTD
发明人： SHOJI JUNICHI , MATSUO KAZUYOSHI , SUMIYOSHI MICHIO , YAMAMOTO YUKIO
IPC分类号： B41J2/44 , G02B26/10 , G03G15/04 , G03G21/14 , H04N1/036 , H04N1/113
摘要： PROBLEM TO BE SOLVED: To provide a multi-beam optical scanner capable of detecting a deviation amount of a scanning direction of a plurality of beams and beam orders and correcting them. SOLUTION: The multi-beam optical scanner is provided with an ON/OFF control circuit 3 for individually lighting/putting out a first light source and a second light source from the time before a synchronization detection means 1 detects a light beam until it detects the light beam, a width measuring means 4 for measuring the pulse width of signals outputted while detecting the light beam in the synchronization detection means 1, and a deviation detection means 13 for judging a timing deviation amount of scanning by the light beam of the first light source and the scanning by the light beam of the second light source and which one of the scanning by the light beam of the first light source and the scanning by the light beam of the second light source precedes from the measured result of the width measuring means 4. COPYRIGHT: (C)2003,JPO

23. 发明专利

JPH10133465A COLOR ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH10133465A
公开(公告)日：1998-05-22
申请号：JP28960696
申请日：1996-10-31
申请人： HITACHI LTD
发明人： SUMIYOSHI MICHIO , MATSUO KAZUYOSHI
IPC分类号： G03G21/00 , G03G15/01 , G03G15/08 , H02J1/00
摘要： PROBLEM TO BE SOLVED: To reduce the power consumption by obtaining such circuit constitution that the supply/disconnection of a power source to supply power to plural detection means detecting the existence of toner, with which a developing device is filled, can be selected by a controller. SOLUTION: Each developing unit is filled with toner of each color, and the toner is supplied to a photoreceptor from a developing roll 5a at the time of developing. Light emitted from a light emitting sensor 501 is transmitted through an optical path 504 or intercepted in accordance with the existence of the toner in the developing unit. When a light receiving sensor 502 attached to a position where the transmitted light is received receives the light, an inside transistor 502a is turned on, and when it does not receive the light, the transistor 502a is kept in an off-state. Then, the existence of the toner is detected according to the difference of the state. The sensors 501 and 502 are controlled by a sensor turning on/off circuit 500 and optionally turned on/off according to an instruction from a CPU. In the case toner existence detecting function is not required, the power source of the detection means is turned off according to a control signal from the controller so as to reduce the power consumption.

24. 发明专利

JPH09258626A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH09258626A
公开(公告)日：1997-10-03
申请号：JP6299396
申请日：1996-03-19
申请人： HITACHI LTD
发明人： YAMAMOTO MASAMI , SASAKI AKIRA , MATSUO KAZUYOSHI
IPC分类号： G03G15/00 , G03G15/16 , G03G21/10
摘要： PROBLEM TO BE SOLVED: To always obtain stable cleaning ability regardless of environmental change and to stably output a high-quality image by connecting a current constant type power source to a cylindrical member. SOLUTION: A cleaning device is constituted of a brush roller 14, a recovery roller 15, a blade 16 and a high voltage power source 17. The roller 14 comes in contact with an intermediate transfer drum 5. The roller 15 is a metallic roller or a roller provided with a resistance layer on its surface and is arranged to bite at the roller 14. The blade abuts on the surface of the roller 15. After toner on the surface of the roller 15 is scraped by the blade, it is carried to a waste toner bottle and discarded. The current constant type high voltage power source 17 is connected to the roller 15. Thus, the fluctuation of the cleaning ability caused by the change in brush resistance is restrained to a minimum because the voltage of the brush is changed to be self-compensated. Therefore, the excellent cleaning performance is always obtained regardless of the change in environmental conditions.

25. 发明专利

JPH08190292A ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH08190292A
公开(公告)日：1996-07-23
申请号：JP170695
申请日：1995-01-10
申请人： HITACHI LTD
发明人： MATSUO KAZUYOSHI , FUKAZAWA NOBUAKI
IPC分类号： G03G15/20 , G05D23/19
摘要： PURPOSE: To stably control a surface temp. of a fixing roller, even if a power source voltage is varied at the time of standby, by providing surface temp. state detecting means of the fixing roller, detecting means for the power source voltage variation at the time of standby, and the means for performing a correction of on-time of heating means when the variation of the power source voltage is detected. CONSTITUTION: The surface temp. of the fixing roller is detected by applying a property of a thermistor 1 as temp. detecting means whose resistivity is varied by the ambient temp., and comparing the voltage imparted the weighing in the voltage dividing circuit composed of the thermistor terminal of (a) point and resistors 51 to 58, by comparing units 59 to 65 as the surface temp. state detecting means. The output of the comparing units 59 to 64 among the detected temp. are inputted to a CPU 14, for obtaining here a varying amount corresponding to a reference temp., on deciding whether turning on or off heating means 16 and 17, and thus the signal of the deciding result is inputted into a NAND circuit 67. Moreover, the output of the comparing unit 65 is inputted from a NOT circuit 66 to the NAND circuit 67, and then a control signal is communicated to a switch 15 for turning on/off of the heating means 16 and 17.

26. 发明专利

JPH07264890A MOTOR CONTROLLER AND WASHING MACHINE 失效
公开(公告)号：JPH07264890A
公开(公告)日：1995-10-13
申请号：JP5053894
申请日：1994-03-22
申请人： HITACHI LTD
发明人： KOGORI JUNJI , MATSUO KAZUYOSHI , TAWARA KAZUO , YASUJIMA TOSHIYUKI , FUTAMI MOTOO
IPC分类号： D06F33/02 , G05B13/02 , H02P6/06 , H02P6/08 , H02P6/28
摘要： PURPOSE:To reduce the vibration and noise of a brushless motor when the motor is driven. CONSTITUTION:A motor driving current controlling and processing section 8 and PWM processing section 9 control a motor driving circuit 1 by preparing the energizing and deenergizing pattern of a motor driving signal. In addition, a pattern learning and processing section 12 learns the energizing and pattern of the motor driving signal immediately before stopping a brushless motor and a pattern computing and processing section 13 prepares the first energizing and deenergizing pattern based on the pattern learnt by the section 12 at the time of restarting the motor. Therefore, the vibration and noise of the motor can be reduced, because the driving current of the motor can be made coincident with a commanded value in an early stage.

27. 发明专利

JPH07210028A COLOR ELECTROPHOTOGRAPHIC DEVICE AND METHOD FOR CONTROLLING FIXING DEVICE THEREOF 失效
公开(公告)号：JPH07210028A
公开(公告)日：1995-08-11
申请号：JP193494
申请日：1994-01-13
申请人： HITACHI LTD
发明人： MATSUO KAZUYOSHI , FUKAZAWA NOBUAKI , ONOSE KATSUYOSHI , OKUHAMA MASASHI , SASAKI AKIRA
IPC分类号： G03G21/14 , G03G15/01 , G03G15/20
摘要： PURPOSE:To improve the control accuracy of the temperature of a fixing device in a color electrophotographic device and to stabilize image quality. CONSTITUTION:When an image forming action is executed through a first process from a standby state and a recording medium is set in the fixing device (first printing time), the temperature state of the standby time just before it is decided. Based on the result, the temperature of the first printing time is compensated and the surface temperature of a fixing roller is controlled to be a prescribed state. The temperature drop of the surface of the fixing roller of every one page occurring because the recording medium is passed through the fixing device at a fixing action time is compensated by extracting time corresponding to a taken-away heating value from a data group previously set based on the kind of the recording medium and the number of color superposing processes at an image forming stage before the recording medium is set in the fixing device and turning on heating means 16 and 17.

28. 发明专利

JPH06327286A MOTOR DRIVING EQUIPMENT 失效
公开(公告)号：JPH06327286A
公开(公告)日：1994-11-25
申请号：JP11138693
申请日：1993-05-13
申请人： HITACHI LTD
发明人： FUTAMI MOTOO , YASUJIMA TOSHIYUKI , TAWARA KAZUO , YAMAMOTO NAOKI , KOGORI JUNJI , MATSUO KAZUYOSHI
IPC分类号： H02P6/10 , H02P6/02
摘要： PURPOSE:To make it possible to reduce torque ripples in commutation by gradually increasing the current in the two-phase energized section of an inverter. CONSTITUTION:A corrector 108 corrects a duty factor (ratio of time period for which voltage is applied to a winding) DTO so that the current is inclined, and thereby obtains a duty factor DT. A modulator 105 modulates drive signals of an inverter 101 according to the duty factor DT to produce pulse width modulation signal PD output. A drive circuit 106 generates drive signals DV to drive the switching element of the inverter 101 according to the pulse width modulation signal PD. The inverter 101 performs chopper operation according to the drive signals DV to adjust and control the current fed to a motor 103 so that the motor 103 is run at a commanded number of revolutions NR. This reduces torque ripples that occur in commutation.

29. 发明专利

JPH06254287A OPERATION AND CONTROL METHOD OF DRUM TYPE WASHING MACHINE 失效
公开(公告)号：JPH06254287A
公开(公告)日：1994-09-13
申请号：JP4891093
申请日：1993-03-10
申请人： HITACHI LTD
发明人： MATSUO KAZUYOSHI , KOGORI JUNJI , TAWARA KAZUO , YASUJIMA TOSHIYUKI , GOMITA HISAMITSU
IPC分类号： D06F33/02
摘要： PURPOSE:To reduce washing noise and improve the washing power by a method wherein in a bio-washing mode (soak washing mode), an inverter motor for stream agitation is repeatedly controlled in such a way that after the rotating speed of the inverter motor is gradually increased up to a specified steady-state rotating speed, the steady-state rotating speed is maintained and the inverter motor is reversed after once stopped. CONSTITUTION:A microcomputer 15 of an inverter controller 2 receives control signals from a microcomputer 6 through a receiver 14 and sends control signals to a power switching part 19 through a pre-driver 20 to control an inverter motor 22. In bio-washing mode, after the rotating speed of the motor 22 is gradually increased up to a specified steady-state rotating speed and the steady- state rotating speed is maintained for a specified time period, and then the same operation is performed with the rotation direction reversed. The steady- state rotation speed is 10-20rpm as converted to the rotating speed of an agitator. Thereby, washing noise in bio-washing made can be reduced.

30. 发明专利

JPH0572876A LASER PRINTER AND INFORMATION PROCESSOR USING IT 失效
公开(公告)号：JPH0572876A
公开(公告)日：1993-03-26
申请号：JP23440591
申请日：1991-09-13
申请人： HITACHI LTD
发明人： MATSUO KAZUYOSHI , SASAKI AKIRA
IPC分类号： B41J2/44 , B41J2/00 , G02B26/10 , G03G15/04 , H04N1/04 , H04N1/113 , H04N1/23
摘要： PURPOSE:To print information having different linear densities within a page. CONSTITUTION:The selection of plural secondary BDT signals generated by a laser printer 2 and having different periods and the control of a laser light quantity, are directly executed with a control signal from a host system 1, the host system 1 generates video data in a period corresponding to the linear density while the selection of the secondary BDT signal and the control of the laser light quantity are executed according to the linear density of printing data. Thus, on the side of the host system 1, the selection of the period of the BDT signal of the laser printer 2 and the control of the laser light quantity are directly executed, so that the linear density for printing within a page can be instantaneously converted, as well.

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