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1. 发明专利

DE19844081A1 Image generation device for electrophotographic copier 未知
公开(公告)号：DE19844081A1
公开(公告)日：1999-04-22
申请号：DE19844081
申请日：1998-09-25
申请人： HITACHI KOKI KK
发明人： OKADA HISAO , MITSUYA TERUAKI , AKATSU SHINICHI
IPC分类号： B41J2/525 , G03G13/045 , G03G15/00 , G03G15/01
摘要： A light sensitive drum (1) creates latent electrostatic images by using a first loading device (2), an exposure device (3) and an exposure regulator (4), also a first processor (5), a second processor (6), and a second loading device (7). Operating in tandem are a transformer (8), a cleaner (9), a recording medium (12) and a source of providing energy (15, 16, 17). A sensor (19) regulates the amounts of toner to be delivered.

2. 发明专利

JPH11174788A EXPOSURE CONTROLLER FOR ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH11174788A
公开(公告)日：1999-07-02
申请号：JP34461797
申请日：1997-12-15
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： ISHII MASAYOSHI , HOSHI NOBUYOSHI , SHIMIZU RYUICHI , OKADA HISAO , MABUCHI HIROYUKI , MITSUYA TERUAKI , ITO KENICHI , AKATSU SHINICHI , MARUO SEIJI
IPC分类号： G03G21/00 , G03G15/047
摘要： PROBLEM TO BE SOLVED: To obtain a simple and compact electrophotographic device constituted so that a fringe phenomenon can be suppressed by applying auxiliary exposure to a position where the fringe phenomenon is expected to be caused, that means, a white part around an image with such light quantity that potential between the potential for developing toner and the intermediate potential is generated. SOLUTION: At an exposure time after a photoreceptor 1 is electrified, the photoreceptor 1 is exposed with such light quantity that three potential parts being the electrifying potential part where the toner is regularly developed, the discharge potential part where the toner is reversely developed and the intermediate potential part where the toner is not developed are formed. By an exposure control means 4, the white part all around the image where a reverse electric field is caused and an auxiliary exposure position are decided so as to make an exposure element emit light with auxiliary exposure quantity. Then, the white part which is formed on the back end of the potential part where the toner is developed in the rotating direction of a developing roll and where the reverse electric field is caused is exposed by such light quantity that the potential between the potential for developing the toner and the intermediate potential is generated. Besides, the white part which is formed on the front side and at the side part and where the reverse electric field is caused is exposed by such light quantity that the intermediate potential is generated.

3. 发明专利

JP2000298390A ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JP2000298390A
公开(公告)日：2000-10-24
申请号：JP10753599
申请日：1999-04-15
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MARUO SEIJI , AKATSU SHINICHI , MABUCHI HIROYUKI , MITSUYA TERUAKI , KOBAYASHI SHINYA
IPC分类号： B41J2/44 , G03G15/01 , H04N1/29 , H04N1/50 , H04N1/58
摘要： PROBLEM TO BE SOLVED: To provide an electrophotographic device having no irregularities in an image while restraining a fringe phenomenon at the rear end of the image and that between proximate vertical lines with respect to an exposure device for an electrophotographic device using a tri-level developing method for developing at least two-color toner by performing exposure once. SOLUTION: This device is provided with an image memory 19 for storing plural lines of inputted image data, a main scanning fringe correction exposure decision part 21 deciding the fringe between the proximate vertical lines in a main scanning direction concerning the image data, a subscanning fringe correction exposure decision part 20 deciding the fringe at the lower end of the image in a subscanning direction concerning it, and a switch 18 selecting at least three laser drivers.

4. 发明专利

JPH11174779A ELECTROPHOTOGRAPHIC DEVICE USING POTENTIAL DIVIDING DEVELOPMENT 失效
公开(公告)号：JPH11174779A
公开(公告)日：1999-07-02
申请号：JP34461697
申请日：1997-12-15
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： AKATSU SHINICHI , MITSUYA TERUAKI , ITO KENICHI , HOSHI NOBUYOSHI , SHIMIZU RYUICHI , OKADA HISAO , MABUCHI HIROYUKI , ISHII MASAYOSHI , MARUO SEIJI
IPC分类号： G03G15/01
摘要： PROBLEM TO BE SOLVED: To prevent not only a fringe but also a repulsive fringe from being caused by executing a fringe control action and setting the light intensity of auxiliary exposure so that it becomes almost identical to a reverse electric field causing the fringe and the repulsive fringe. SOLUTION: By an exposure and exposure control means 12, an electrostatic latent image is formed on the surface of a photoreceptor drum 1 uniformly electrified by an electrifier 2. By two developing units 4 and 5, the electrostatic latent image is developed by using the toner of two colors by a potential dividing developing method. At this time, the auxiliary exposure is actuated according to an input image signal 11 by an auxiliary exposure control means 13 arranged in the exposure and exposure control means 12. Then, the light intensity of the auxiliary exposure is set by adjusting developing bais so that the fringe and the repulsive fringe become an almost identical degree when they are caused. Thus, the fringe is suppressed and the repulsive fringe is also simultaneously suppressed.

5. 发明专利

JP2001296726A ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JP2001296726A
公开(公告)日：2001-10-26
申请号：JP2000113166
申请日：2000-04-14
申请人： HITACHI KOKI KK
发明人： MITSUYA TERUAKI , HOSHI NOBUYOSHI , OKADA HISAO , SANO YOSHIHIKO , AKATSU SHINICHI , KOBAYASHI SHINYA
IPC分类号： B41J2/44 , G03G15/01 , G03G15/04 , G03G15/043 , H04N1/40
摘要： PROBLEM TO BE SOLVED: To realize an auxiliary exposure multi-leveled in terms of light quantity with a small circuit scale in a potential division developing type fringe control. SOLUTION: In the electrophotographic device, an area having at least three values of different potential levels Vc, Vw and Vr is formed on a photoreceptor by using an exposure device, and different kinds of coloring particles are developed by normal development and reversal development at two values of potential levels Vc and Vr excepting the middle potential level Vw. The device is equipped with an auxiliary exposure means forming potential for preventing fringe development at the edge of an image formed area in order to prevent the fringe development, and the auxiliary exposure means sets the auxiliary exposure amount by modulating a laser driver in terms of pulse width.

6. 发明专利

JPH11184205A ELECTROPHOTOGRAPHIC DEVICE USING POTENTIAL DIVIDING DEVELOPING METHOD 失效
公开(公告)号：JPH11184205A
公开(公告)日：1999-07-09
申请号：JP35083697
申请日：1997-12-19
申请人： HITACHI KOKI KK
发明人： AKATSU SHINICHI , MITSUYA TERUAKI , OKADA HISAO , ITO KENICHI
IPC分类号： B41J2/525 , G03G15/01
摘要： PROBLEM TO BE SOLVED: To prevent a fringe phenomenon and to obtain an image without error printing by performing correction exposure by exposure control in order to restrain an inverse electric field which becomes the cause of the fringe phenomenon. SOLUTION: A laser beam 4 is emitted by an exposure control means 3, a photoreceptor drum 2 is irradiated with the laser beam, and a latent image whose surface potential is different is formed on the drum 2. Then, as to the latent image formed on the drum 2, the toner of two colors whose electrification polarity is different, that is, positively electrified toner as first toner is developed by a first developing machine 5 and negatively electrified toner as second toner is developed by a second developing machine 6 to the latent image by an electrical potential division developing method. The toner of two colors on the drum 2 is transferred to a paper 12 by a transfer machine 8, and fixed on the paper 12 by a fixing machine 9. At this time, a correction exposure deciding circuit 13 inside the means 3 decides whether or not the correction exposure is performed from an image signal 11, and the correction exposure is performed based on the decision result.

7. 发明专利

JP2002341607A METHOD OF CONTROLLING ELECTROPHOTOGRAPHIC IMAGE PRINTING AND RECORDER USING THE SAME 失效
公开(公告)号：JP2002341607A
公开(公告)日：2002-11-29
申请号：JP2001148869
申请日：2001-05-18
申请人： HITACHI KOKI KK
发明人： MITSUYA TERUAKI , KUBOTA KEISUKE , MABUCHI HIROYUKI , ISHII MASAYOSHI , AKATSU SHINICHI
IPC分类号： G03G15/00 , G03G15/04 , G03G15/043 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a highly accurate film thickness detecting method for a photoreceptor and to provide an image printing control method and a recorder which secure temporally stable image quality to all image patterns even if the deterioration of the photoreceptor occurs. SOLUTION: A surface potential sensor is placed behind the developing device in the rotating direction of the photoreceptor, and the photoreceptor film thickness is detected from the change of the electrical potential of the electrostatic charge region. Moreover, the development potential on the surface of the photoreceptor is kept stable with time by applying feedback control to the electrical potential on the surface of the photoreceptor. The film thickness of the photoreceptor is detected and the exposure is applied with auxiliary light quantity only to the region in which the potential distribution of the photoreceptor changes from the electrification potential to the discharge potential.

8. 发明专利

JPH10307449A IMAGE FORMING DEVICE USING POTENTIAL DIVISION DEVELOPING SYSTEM 失效
公开(公告)号：JPH10307449A
公开(公告)日：1998-11-17
申请号：JP11960397
申请日：1997-05-09
申请人： HITACHI KOKI KK
发明人： ISHII MASAYOSHI , MABUCHI HIROYUKI , AKATSU SHINICHI
IPC分类号： G03G15/01 , G03G15/06 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To restrain fringe development caused by the sweeping of fog by forming an electrostatic latent image which is not developed on a background part separated from an image part on the trailing edge side of the image part with respect to the rotating direction of a developing roll. SOLUTION: Image forming operation is performed by forming a latent image by an exposure means 10 after uniformly eletrifying a photoreceptor 1 by an electrifier 2. At such a time, an image signal 11 is recognized and the electrostatic latent image which is not developed is formed at a separate position on the trailing edge side of the latent image by a negative image pattern adding device 12. The latent image by potential division developing is developed with two kinds of toner by two developing machines 3 and 4. In a pretransfer electrifier 5, the electrifying polarity is adjusted because the electrifying polarities of two colors of toner with which the image is developed are different. Then, two colors of toner is transferred to transfer paper 6 by a transfer machine 7. Thereafter, the toner is melted and fixed on the paper 6 by a fixing machine 8. Then, the residual toner is recovered by a cleaner 9. Thus, the fringe development caused by the sweeping of the fog is restrained.

9. 发明专利

JP2000112207A DEVELOPMENT CONTROL METHOD FOR POTENTIAL DIVIDED DEVELOPMENT SYSTEM AND IMAGE FORMING DEVICE 失效
公开(公告)号：JP2000112207A
公开(公告)日：2000-04-21
申请号：JP28071898
申请日：1998-10-02
申请人： HITACHI KOKI KK
发明人： ISHII MASAYOSHI , MABUCHI HIROYUKI , AKATSU SHINICHI
IPC分类号： G03G15/00 , G03G15/01
摘要： PROBLEM TO BE SOLVED: To improve an image to an initial image-level from a degraded state, caused by deterioration of developer with time and a fog increase due to scrape, by changing the set value of toner concentration from a first set value for ordinary printing to a second set value that is lower than the first set value, and returning it to the first set value after the discharge of toner onto a photoreceptor, thereby returning the toner concentration to the ordinary value. SOLUTION: In an idle running process in which a development process is carried out without transferring toner developed on a photoreceptor to a recording medium, a power source is set so that the development bias of a first developing machine has potential Vb1r that is nearer to the positive side than a photoreceptor surface potential Vw, and, at the same time, the set value of the toner concentration of developer is changed from an ordinary first set value to a second set value that is lower than the first set value. After the idle running process is carried out until the toner concentration in the developing device reaches the second set value, the development bias of the developing device is returned to an ordinary potential Vb1, at the same time, the set value of the toner concentration is returned to the ordinary first set value, and the idle running process is resumed.

10. 发明专利

JPH11102099A TWO-COLOR IMAGE FORMING DEVICE 失效
公开(公告)号：JPH11102099A
公开(公告)日：1999-04-13
申请号：JP26198297
申请日：1997-09-26
申请人： HITACHI KOKI KK
发明人： OKADA HISAO , MITSUYA TERUAKI , AKATSU SHINICHI
IPC分类号： B41J2/525 , G03G13/045 , G03G15/00 , G03G15/01
摘要： PROBLEM TO BE SOLVED: To prevent a fringe phenomenon and to obtain a sharp image by deciding a white part, around a potential part where development with toner is attained, so as to execute exposure with a light quantity for obtaining the potential between the potential at which the development with the toner is attained and an intermediate potential. SOLUTION: Two color toner images of first and second toner images formed on a photoreceptive drum 1 are corona-irradiated by a second electrifier 7, to make the polarities of the charges the same, that is, negative ones. A high voltage is applied from a power source 17 to the second electrifier 7. When the applied voltage is positive, first and second toners are set to obtain positive charges. When the applied voltage is negative, the first and second toners are set to obtain negative charges. An exposure control means 4 decides the white part around the potential by electrification. When it is decided that the white part is one around the potential part by the electrification, the exposure is executed with the light quantity by which the potential between the potential by the electrification and the intermediate potential is made. On the other hand, when it is decided that the white part is one around a discharge potential part, the exposure is executed with the light quantity by which the potential between a discharge potential and the intermediate potential is made.

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