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31. 发明专利

JPS6337368A METHOD AND DEVICE FOR TRANSFER AND SEPARATION IN ELECTROPHOTOGRAPHY 失效
公开(公告)号：JPS6337368A
公开(公告)日：1988-02-18
申请号：JP18155886
申请日：1986-08-01
申请人： RICOH KK
发明人： KUROKAWA JUNJI
IPC分类号： G03G15/14 , G03G13/16
摘要： PURPOSE:To always obtain a good transfer image quality, and to easily execute a separation of a transfer material by using an AC corona discharge which has been brought to DC bias to the same polarity as an electrification polarity of a non-image part of a photosensitive body, as a separating corona charge for peeling off the transfer material from the surface of the photosensitive body. CONSTITUTION:An image part 4 formed on a surface layer part 5 of a photosensitive layer 1a which has been electrified positive is an area where no charge exists, because it has been formed by radiating directly a light beam, and its potential level becomes a bright potential VL. On the other hand, a non-image part 5a except the image part 4 becomes a dark potential VD of almost the same potential as the potential at the time of electrification. By using a developing electrode 2 to which a DC bias VB has been applied to the same polarity as the charge of the surface of the photosensitive body, a toner is electrified positive, the toner is attracted electrostatically to the image part 4, and a toner image 4a is formed. The potential of the image part in this case becomes VB-VL. In this regard, the developing bias VB is lower than the potential VD of the non-image part of a photosensitive body 1, but a peripheral edge part of a no-charge area of the image part 4 is induced to the negative polarity by a peripheral electric field effect by the positive charge of the non-image part, therefore, the toner is attracted satisfactorily even by the developing bias potential VB being lower than the non-image part potential VD.

32. 发明专利

JPS62148988A METHOD FOR DESTATICIZING PHOTOSENSITIVE BODY 失效
公开(公告)号：JPS62148988A
公开(公告)日：1987-07-02
申请号：JP28794685
申请日：1985-12-23
申请人： RICOH KK
发明人： KUROKAWA JUNJI
IPC分类号： G03G21/08 , G03G21/00
摘要： PURPOSE:To destaticize a photosensitive body with an easy method by continuing to charge and destaticize a transfer charged part of a photosensitive body until the last charged part reaches an exposure position when image formation on the layer-built photosensitive body is terminated. CONSTITUTION:A layer-built photosensitive body 1 is charged negatively and is exposed to a laser in an exposure position 3 to form a latent image. Since a toner due to the reversal development has the negative polarity in a developing device 4, a transfer charger 5 performs transfer by positive discharge, and the photosensitive body 1 is charged positively. After transfer, positive charge remains though negative charge is removed by a quenching device 7. This positive charge is removed by a primary charger 2 and in the exposure position 3 while image formation is continued. Consequently, the electric charge of the photosensitive body 1 is removed if this operation is continued until the last transfer-charged part reaches the exposure position 3. Thus, the operation stop timing is delayed to destaticize the photosensitive body without a special destaticizing device.

33. 发明专利

JPS6266762A IMAGE READER 失效
公开(公告)号：JPS6266762A
公开(公告)日：1987-03-26
申请号：JP20615185
申请日：1985-09-18
申请人： RICOH KK
发明人： KUROKAWA JUNJI
IPC分类号： H04N1/10 , H04N1/107
摘要： PURPOSE:To make it possible that an original surface is seen directly in case of image read, by setting upward the original on an original set table and moving relatively a scanner, on which an exposure lamp and an image sensor are mounted, above the original surface. CONSTITUTION:An original 3 is set upward on an original set table 2 and is retained by a glass pressing plate 4, and a scanner 5 is scanned in the direction of an arrow in this state to read the image on an original surface 3a digitally by a contact image sensor 8. This scanner 5 consists of an exposure lamp 6 which exposes and illuminates the original surface 3a, a SELFOC lens array 7 as a converging optical transmission body which receives reflected light from the original 3, and the contact image sensor 8.

34. 发明专利

JPH09146347A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH09146347A
公开(公告)日：1997-06-06
申请号：JP30253995
申请日：1995-11-21
申请人： RICOH KK
发明人： KUROKAWA JUNJI
IPC分类号： G03G15/02 , G03G21/00 , G03G21/10
摘要： PROBLEM TO BE SOLVED: To prevent the generation of a horizontal streaky abnormal image by providing a control means for rotationally dividing a photoreceptor, at the time of warming up a fixing means. SOLUTION: A recording paper after receiving the transfer of a toner image is separated from the surface of a photoreceptor 1 and carried to a fixing unit 8 by a carrying belt 7, to fix an image on the recording paper. The surface of the photoreceptor 1 after the image is transferred is cleaned in such a manner that stuck soil such as toner remaining after the transfer is removed by cleaning blades in two stages 9a and 9b and then, charged by an electrifying roller 2 again. At the time of warming up the fixing means, the photoreceptor 1 is driven to rotate until the contact part of the surface of the photoreceptor 1 with the electrifying roller 2 is rubbed by the blades 9a and 9b on the surface of the photoreceptor 1 at least several times or more by the control means. Thus, foreign matter after being transferred to the surface of the photoreceptor 1 from the electrifying roller 2 is wiped by the blades 9a and 9b and the surface of the photoreceptor is leveled, so that the horizontal streaky abnormal image can not appear.

35. 发明专利

JPH0980865A ELECTRIFYING ROLL 失效
公开(公告)号：JPH0980865A
公开(公告)日：1997-03-28
申请号：JP23184695
申请日：1995-09-08
申请人： RICOH KK
发明人： KUROKAWA JUNJI , TABUCHI TAKESHI
IPC分类号： G03G15/02 , F16C13/00
摘要： PROBLEM TO BE SOLVED: To improve the uniformity of electrification by an electrifying roll with a surface layer of a nonadhesive resin contg. dispersed electrically conductive particles, to reduce the humidity dependency of the resistance of the electrifying roll and to reduce the variation of electrification characteristics due to an environmental change. SOLUTION: In this electrifying roll 100 with at least an elastic layer 102 and a surface layer 103 coating the surface of the elastic layer 102, the surface layer 103 contains low structure acetylene black of 48-55mμ particle diameter.

36. 发明专利

JPH0926687A ELECTROSTATIC CHARGING ROLLER AND IMAGE FORMING DEVICE USING THE SAME 失效
公开(公告)号：JPH0926687A
公开(公告)日：1997-01-28
申请号：JP12486596
申请日：1996-05-20
申请人： RICOH KK
发明人： KUROKAWA JUNJI , NOJIMA KAZUO , CHIBA MASAKO , NAKAHARA TOSHIO
IPC分类号： G03G15/02 , F16C13/00 , G03G15/00 , G03G15/06
摘要： PROBLEM TO BE SOLVED: To suppress the increase of the cost of the device itself, the increase of a power source cost and the generation of a large amt. of ozone and to avert the deterioration of an electrostatic charging member and photoreceptor and further, pollution problems by specifying the content of the constituting material of the electrostatic charging roller consisting of a surface layer and an elastic layer having a constituting material. SOLUTION: The constituting material of the elastic layer 102 is incorporated into the surface layer 103 of the electrostatic charging roller 100 having the elastic layer 102 and the surface layer 103 covering the surface of the elastic layer 102. The content of the constituting material of the elastic layer 102 incorporated into the surface layer 103 is 5 to 60wt.% and the difference in the electric resistance values between the elastic layer 102 and the surface layer 103 is about Ω.cm. The surface layer 103 is formed of a high-polymer compd. consisting of at least polar synthetic resin and a nonadhesive resin. The high-polymer compd. is so formed on the elastic layer 102 that its film thickness attains about 10 to 100μm. As a result, the good electrostatic charge efficiency is obtd. and the uniform electrostatic charge is obtd. only by the impression of the DC voltage. The constitution is simplified when a thermistor detecting the temp. on the peripheral of the electrostatic charging roller 100 is built into a developing bias power source circuit.

37. 发明专利

JPH08220840A ELECTRIFYING ROLLER, ROLLER ELECTRIFYING DEVICE AND IMAGE FORMING DEVICE USING SAME 失效
公开(公告)号：JPH08220840A
公开(公告)日：1996-08-30
申请号：JP24592995
申请日：1995-09-25
申请人： RICOH KK
发明人： KUROKAWA JUNJI
IPC分类号： F16C13/00 , G03G15/02
摘要： PURPOSE: To improve the withstand voltage of an electrifying roller and to avoid the leadkage of charge caused by the pinhole of a photoreceptor drum even in the case of performing electrification by impressing only DC voltage on the electrifying roller. CONSTITUTION: This electrifying roller 101 is provided with a roller layer 105 consisting of two layers, that is, an elastic layer 101a and a surface layer 101b covering the surface of the elastic layer 101a on the circumference of a mandrel 103; and gradient (ΔI/ΔV) in the log-log representation of the V-I characteristic of the roller layer 105 is

38. 发明专利

JPH06314014A IMAGE FORMING DEVICE AND METHOD FOR HANDLING THE SAME 失效
公开(公告)号：JPH06314014A
公开(公告)日：1994-11-08
申请号：JP12539593
申请日：1993-04-28
申请人： RICOH KK
发明人： NAKAHARA TOSHIO , KUROKAWA JUNJI
IPC分类号： G03G15/02 , G03G15/00
摘要： PURPOSE:To make the electrifying means for the image forming device interchangeable to satisfy the use and purpose if the need arises. CONSTITUTION:In a corona electrifier 2a and a contact type electrifier 2b, the same engaging members 26 engaged with the guide rails 12 of a copying machine is attached, fitting parts 23a of the same shape and size are provided, the same connecting terminals 25a are also provided, and further, they are designed so that they are almost the same in outside diameter. Thus, both the electrifiers can be attached to the copying machine without making any change to the opening part 10 and guide rail 12 of the copying machine. Therefore, the corona electrifier 2a of the copying machine once distributed to a market can be exchanged with the contact type electrifier 2b, and the polution- free copying machine that suppresses the production of ozone can be obtained.

39. 发明专利

JPH05289475A 失效
公开(公告)号：JPH05289475A
公开(公告)日：1993-11-05
申请号：JP9569092
申请日：1992-04-15
申请人： RICOH KK
发明人： NAKAHARA TOSHIO , KUROKAWA JUNJI
IPC分类号： G03G15/02 , G03G21/00 , G03G21/10 , H04N1/29
摘要： PURPOSE:To recover toner stuck to the outer periphery of a contact electrifying roller without the recovering member of a tray, etc., by removing the toner while preventing leakage from a roller cleaning member in slide-contact with the contact electrifying roller, CONSTITUTION:The roller cleaning member 14 is provided so as to be in contact with/separate from the surface of the contact electrifying roller 12, on the downstream side 'in the moving direction of the contact electrifying roller 12, to its contact position Tap with a photosensitive body 11. The cleaning member 14 is abutted on the contact electrifying roller 12 when an image is not formed by an image forming process means 10, and the toner Tn stuck to the surface of the roller, is scratched off onto the photosensitive body 11, and recovered by a developing part 13. On the other hand, the roller cleaning member 14 is separated from the surface of the contact electrifying roller 12, at the time of forming the image, to prevent the leakage and simultaneously, recover the toner without providing the tray, etc.

40. 发明专利

JPH0553413A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH0553413A
公开(公告)日：1993-03-05
申请号：JP21871891
申请日：1991-08-29
申请人： RICOH KK
发明人： KUROKAWA JUNJI , NAKAHARA TOSHIO
IPC分类号： G03G15/02 , G03G21/00 , G03G21/10 , G03G21/14
摘要： PURPOSE:To perform uniform electrification throughout the whole surface of a photosensitive drum by preventing adhesion of a foreign matter, such as a toner, on the surface of an electrically changed roller. CONSTITUTION:After a photosensitive drum 1 is started to rotate, it is rotated and moved until a position Poi corresponding to a cleaning blade 8 on the surface of the photosensitive drum 1 during the starting of driven passes a position corresponding to an electrically charged roller 2. In this case, by controlling the electrically charged roller 2 by a control device 10 so that the electrically charged roller 2 is shifted from a separating state to a state that it is brought into pressure contact with the photosensitive drum 1, the electrically charged roller 2 is brought into contact with the part, constantly cleaned by a cleaning blade 8, of the photosensitive drum 1, and a foreign matter, such as a toner, is prevented from adhering on the surface of the electrically charged roller 2.

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