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1. 发明专利

JPH02109069A SCANNING OPTICAL SYSTEM FOR ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH02109069A
公开(公告)日：1990-04-20
申请号：JP26150388
申请日：1988-10-19
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： OBARA KAZUTOSHI , NAMIKAWA OSAMU , TSUJI YASUYUKI , MORIO SHUICHI , OSHIMA MINORU , SAITO SUSUMU , ARIMOTO AKIRA
IPC分类号： G02B26/10 , B41J2/44 , G03G15/04
摘要： PURPOSE:To eliminate the misalignment for a printing start by calibrating a signal transfer time difference between each signal line caused by a propagation delay by a delaying circuit provided on each printing signal line and adjusting the transfer time, in a laser beam printer using plural light sources. CONSTITUTION:When a beam detector 7 is scanned by a laser light, a reference signal from the detector 7 is received by a control device 1, and a printing signal A and a printing signal B are sent out simultaneously to a signal line 9 and 10, respectively. In this case, the signal A and B generate a time difference (t) by a propagation delay of the respective signal lines, but allowed to reach as they are a delaying circuit 2 and 3, respectively. In this case, when the delaying circuit is set in advance so that the quicker signal is delayed by the time difference (t), the time difference between each signal is negated by passing through the delaying circuit, and the signals are sent out simultaneously to signal lines C, D again. Accordingly, laser devices 4, 5 are driven simultaneously, and laser beams 13, 14 are also emitted simultaneously. In such a way, the misalignment for a printing start on the surface of a drum 8 is eliminated.

2. 发明专利

JPH1039573A EXPOSURE CONTROL METHOD FOR ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH1039573A
公开(公告)日：1998-02-13
申请号：JP19433096
申请日：1996-07-24
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MARUO SEIJI , OKADA HISAO , MABUCHI HIROYUKI , OBARA KAZUTOSHI , ITO KENICHI
IPC分类号： B41J2/525 , B41J2/44 , G03G15/01 , G03G15/04 , G03G15/043 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To realize such a printing action that a fringe is suppressed by making the reverse electric field of the periphery of an image part generating the fringe weak by using an exposure control means and suppressing the generation of fringe. SOLUTION: A latent image is exposed and formed on a photoreceptor drum by an exposure control means and developed by the toner of two colors by a try-level developing method by using two developing machines. The required try-level of the surface potential of the photoreceptor is obtained by switching two laser drivers 14 and 15 by a switch 16. By controlling the potential around the image stepwise by the exposure, the peripheral electric field of the image is made weak and the surface electric field of the photoreceptor is improved to such a level that a fringe phenomenon is not generated. Then, a dedicated laser driver 17 is added in order to control the exposure and data inputted from a host device is stored in an image memory 19. Besides, a fringe correction decision circuit 18 deciding a condition for actuating the driver 17 for correcting the fringe is arranged.

3. 发明专利

JPH03225315A BEAM POSITION CONTROLLER 失效
公开(公告)号：JPH03225315A
公开(公告)日：1991-10-04
申请号：JP1904690
申请日：1990-01-31
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： OSHIMA MINORU , SAITO SUSUMU , MORIO SHUICHI , NAMIKAWA OSAMU , KIYONO MINORU , MOCHIZUKI KENJI , NAGURA MAKOTO , OBARA KAZUTOSHI , ARIMOTO AKIRA , KASAI MASUO
IPC分类号： G02B26/10 , B41J2/44 , G03G15/04
摘要： PURPOSE:To easily vary a beam interval by composing the beam position controller of 1st and 2nd photodetectors, and arranging plural 2nd photodetectors and switching beam positions. CONSTITUTION:The upper half of a figure is a servo control circuit which controls a beam 1, which is held halfway between the 1st photodetectors 31 and 32. The lower half of the figure is a servo control which controls a beam 2 and consists of five 2nd photodetectors 51 - 55. The respective intervals of the detectors 51 - 55 are made equal to the difference between beam intervals P1 from the 1st photodetector 31. The outputs the photodetectors 51 - 55 are converted by a converter 21 into voltages, which are inputted to sum output devices 56 - 59; and the signals are selected by a control switch 60 and fed back to a difference output device 61. At this time, the control switch 60 performs switching to the outputs of sum output devices 56 and 58, and 57 and 59 with a switching signal 61 and the signal from a difference output device 23 is passed through an amplifier 27 to hold a beam 2 on the photodetector by moving a movable reflector 6.

4. 发明专利

JPH03225314A BEAM POSITION CONTROLLER 失效
公开(公告)号：JPH03225314A
公开(公告)日：1991-10-04
申请号：JP1904590
申请日：1990-01-31
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： OSHIMA MINORU , MORIO SHUICHI , SAITO SUSUMU , NAMIKAWA OSAMU , OBARA KAZUTOSHI , KIYONO MINORU , MOCHIZUKI KENJI , NAGURA MAKOTO , ARIMOTO AKIRA , KASAI MASUO
IPC分类号： G02B26/10 , B41J2/44 , G02B26/08 , G02B26/12 , H04N1/047 , H04N1/113 , H04N1/12 , H04N1/19
摘要： PURPOSE:To eliminate the influence of disturbance such as temperature variation and vibration providing an oscillator and a control switch in a beam position control circuit. CONSTITUTION:The oscillator 8 is oscillated with an initializing signal to move movable reflectors 4a and 4b, and thus beams 5a and 5b are deflected and become easy to strike a photodetector, which detects the beams 5a and 5b to perform servo control. Phase advancing circuits 33 and 34 which compensates the phase delay in sample holding circuits 35 and 36 are provided to compensated the phase delay. Position errors of the individual detectors and characteristic errors in manufacture are adjusted by voltage adjusting means 27 and 28, so beam positions can accurately by adjusted. The phase delay circuits 35 and 36 for a low frequency range are provided to improve the gain in the low frequency range, so shifts of the beam positions can be suppressed.

5. 发明专利

JP2003112444A ELECTROPHOTOGRAPHIC APPARATUS 审中-公开
公开(公告)号：JP2003112444A
公开(公告)日：2003-04-15
申请号：JP2001309970
申请日：2001-10-05
申请人： HITACHI KOKI KK
发明人： ITO KENICHI , OBARA KAZUTOSHI , KOBASHI SADANORI
IPC分类号： B41J2/44 , G03G15/04 , G03G15/043 , H04N1/23
摘要： PROBLEM TO BE SOLVED: To ensure a good printing quality by eliminating density spots by a printing position. SOLUTION: Intensity data of a laser light digitized to correspond by one to one to printing signals from a superior controller is stored by a storage device. The data is judged from the printing result, rewritten by a data rewrite device and outputted sequentially from the storage device by a VD-CLK during a printing period of time. A potential obtained by converting the outputted data by a DA converter to an analog voltage and a potential obtained by an auto power control which is fixed during the printing period of time are added by an adder. A laser is made to emit light based on the added potential, whereby a laser power during one scanning is varied at an arbitrary position.

6. 发明专利

JPH10198237A IMAGE RECORDER 失效
公开(公告)号：JPH10198237A
公开(公告)日：1998-07-31
申请号：JP269997
申请日：1997-01-10
申请人： HITACHI KOKI KK
发明人： IKEDA YOSHIMITSU , SANO YOSHIHIKO , SHIMIZU HITOSHI , OBARA KAZUTOSHI
IPC分类号： G03G21/00 , B41J29/20 , G03G15/00
摘要： PROBLEM TO BE SOLVED: To control data based on the consumption of consumables by simple constitution by storing it in a non-volatile ferroelectric memory (FRAM). SOLUTION: The data based on the consumption of the consmables is stored in the FRAM 2 and the power source terminal of the FRAM 2 is connected to a power source 1. When the power source 1 is turned on, electric power is supplied to the power source terminal of the FRAM 2 from the power source 1 so that the data can be written and held. When the power source 1 is turned off, the data cannot be written because the electric power is not supplied to the power source terminal of the FRAM 2 from the power source 1. However, the data itself based on the consumption of the consumables and written in the FRAM 2 is held even when an auxiliary power source is not arranged because of the characteristic of the FRAM 2. Thus, the data based on the consumption of the consumables is controlled by the simple constitution without requiring the replacement of a battery and arranging a mechanism accompanying the storage element structure of the auxiliary power source, a data transfer mechanism and the like.

7. 发明专利

JPH08225216A ELECTROPHOTOGRAPHIC PRINTING DEVICE 失效
公开(公告)号：JPH08225216A
公开(公告)日：1996-09-03
申请号：JP2925195
申请日：1995-02-17
申请人： HITACHI KOKI KK
发明人： SANO YOSHIHIKO , TSUJI HOKYO , TERAKADO TAKESHI , OBARA KAZUTOSHI , KAWAMOTO MASARU
IPC分类号： G03G15/00 , B65H29/60 , B65H35/04
摘要： PURPOSE: To fix the paper size, improve the effective printing speed, and stabilize the paper conveying property in an electrophotographic printing device printing the print data of multiple sizes. CONSTITUTION: This electrophotographic printing device is provided with the first paper conveyance path 50 having a paper cutting mechanism cutting the printed paper in half and a paper aligning mechanism aligning the cut paper in the order of the printed data and the second paper conveyance path 51 conveying the printed paper without cutting it. A switching means 52 is operated in response to the printing size data sent from a controller 25 to switch the paper conveyance paths 50, 51.

8. 发明专利

JPH08175728A SHEET ALIGNING MECHANISM 失效
公开(公告)号：JPH08175728A
公开(公告)日：1996-07-09
申请号：JP32048394
申请日：1994-12-22
申请人： HITACHI KOKI KK
发明人： TERAKADO TAKESHI , TSUJI HOKYO , SANO YOSHIHIKO , OBARA KAZUTOSHI , KAWAMOTO MASARU
IPC分类号： G03G15/00 , B65H29/20
摘要： PURPOSE: To make stable alignment of paper sheets which involves less probability of jam occurrence and free from risk of damage caused by collision of sheets by truing up side edge of sheets after two sheets have completely passed the branch point of a transport path, and setting distance between the transport branch point and sheet-side-edge truing-up roller at least to a value greater than the max. length of the sheets in use. CONSTITUTION: One of two cut segments of a sheet of paper is branched to the lower transport path while fed by a straight transport roller 1 and is fed to straght transport rollers 2, 3, 4. The other sheet segment is fed by straight transport rollers 1, 6, and when its trailing edge has completely passed the branch point F of the transport path, the sheet bites into the first width feed roller 7, and width feed adjustment is made toward the under situated sheet. The sheet with the width feed commenced by the first width feed roller 7 is subjected to further shift in the width direction by the second width feed roller 8. In this manner the truing-up of side edge of the sheets is completed before the converging point of the transport path, and at this points, the two sheet segments are put one over another in alignment and are delivered together by another straight transport roller 5.

9. 发明专利

JPH08175703A DEVICE FOR TRUING UP SIDE EDGE OF SHEET 失效
公开(公告)号：JPH08175703A
公开(公告)日：1996-07-09
申请号：JP32288394
申请日：1994-12-26
申请人： HITACHI KOKI KK
发明人： OBARA KAZUTOSHI , TSUJI HOKYO , SANO YOSHIHIKO , TERAKADO TAKESHI , KAWAMOTO MASARU
IPC分类号： B41J15/04 , B65H9/16 , G03G15/00
摘要： PURPOSE: To quickly and stably align the sheets differed from each other in ream weight and true up the side edge of sheets without interfering with the conveying speed by switching the sheet coveying speed of a skew conveying path when a sheet strikes a guide. CONSTITUTION: A sheet 50 strikes a guide 49 at 15IPS or at a half of the normal conveying speed 30IPS, and is conveyed to a conveying roller 46 with the side edge along the guide 49. When the sheet 50 is picked up by the conveying roller 46, a control circuit 52 increses the peripheral speed up to 30IPS based on the conveying speed of a motor 51 in preparation for the following sheet. However, when the speed at which the sheet 50 strikes the guide 49, is too low, the sheet collides with the following sheet, and thereby the speed must be reasonable in consideration of the sheet feeding interval. Thus, since the sheet 50 strikes the guide 49 at a lower speed than the normal sheet conveying speed, even a thin paper sheet, the ream weight of which is small, can be stably aligned and trued up with side edge of the sheet.

10. 发明专利

JPH07234558A IMAGE FORMING DEVICE, AND SHEET JOGGING METHOD USED THEREIN 失效
公开(公告)号：JPH07234558A
公开(公告)日：1995-09-05
申请号：JP2807994
申请日：1994-02-25
申请人： HITACHI KOKI KK
发明人： SANO YOSHIHIKO , TSUJI HOKYO , TERAKADO TAKESHI , OBARA KAZUTOSHI , KAWAMOTO MASARU
IPC分类号： B26D5/00 , B26D7/26 , B65H39/06 , G03G15/00
摘要： PURPOSE:To efficiently integrate the function of a sheet after-treatment device by providing such a constitution as cutting a sheet on which images for a plural ity of pages are formed in page units, arranging the cut sheets in order, and housing them. CONSTITUTION:A toner image on a photosensitive drum 5 is transferred onto a sheet 4 by a transfer device 8, and the sheet 4 is separated from the photosensitive drum 5 by a releasing device 9, and sent to a fixing part by a carrying belt 10. In case of single-surface printing, the sheet is carried by carrying rollers 13, 14, and housed in a stacker 19 by a paddle 18. In case of double-surface printing, the sheet is sent to a switch back 16 by the carrying rollers 13, 14, reversed by a carrying roller 15, and then sent by a carrying roller 17 to carry out the transfer to the sheet reverse surface, and after fixed in the same manner as the sheet surface, the sheet is housed in the stacker 19. The sheet 4 in which images for a plurality of pages are formed on one sheet by the single-surface or double-surface printing process is halved by a cutting mechanism, arranged in the order of printing data by a sheet jogging mechanism, and housed in the stacker 19 by a housing mechanism.

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