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1. 发明专利

DE2338837B2 未知
公开(公告)号：DE2338837B2
公开(公告)日：1980-11-27
申请号：DE2338837
申请日：1973-07-31
申请人： MITA INDUSTRIAL CO. LTD., OSAKA (JAPAN)
发明人： MATSUMOTO, SHOJI, NEYAGAWA , NISHIHAMA, HITOSHI, HIRAKATA , AIZAWA, TATSUO, OSAKA
IPC分类号： G03G15/05 , G03G5/00 , G03G5/02 , G03G15/01 , G03G15/18 , G03G15/22 , G03G13/056
摘要： 1433350 Transferring latent images MITA INDUSTRIAL CO Ltd 30 July 1973 [31 July 1972] 36165/73 Heading G2H In a method of charge image transfer electrophotography employing a sensitive member having a conductive base 1, a photo-conductive layer 2 and a transparent insulating layer 3, the surface of the member is first charged primarily overall (using a direct current corona 5), the surface is then exposed to an image having light areas L and dark areas D and simultaneously or subsequently is subjected to a secondary charging (using an alternating current corona 9). The photoconductive layer is then treated (e.g. by overall light exposure) to eliminate the charge at the interface between the photo-conductive layer and the insulating layer, the resulting electrostatic image is transferred by contact to a transfer sheet which is then developed and fixed in the conventional manner. The characteristics of the alternating current used for secondary charging and/or the secondary charging time are chosen so that the electrostatic image formed on the surface of the member after dissipation of the interface charge has the same polarity as the polarity of the primary charging and so that the potential of the light areas L of said image is substantially equal to the "untransferable upper limit potential" and the potential of the dark areas D are higher than the said limit potential. The "untransferable upper limit potential" is defined as the upper limit of the potential which does not permit the electrostatic image to be transferred for a copy sheet by mere contact. A multi-colour electrophotographic apparatus employing this method comprises a sensitive surface A mounted on a drum 1 for circulation past primary charging station 4, a secondary charging and colour exposure station 28, an overall exposure station 39 and an electrostatic image transfer station M. Image-receiving material 10 is fed from a roll by a series of rollers, cut to a length corresponding to the length of the original by cutters 50, 51, and taken up by a suction drum 49 which advances it past the transfer station M, a developing zone and a fixing zone 71. To effect multi-colour reproduction the receiving sheet is circulated a plurality of times past the transfer station M, each time picking up one colour separation image of the original and being developed with the corresponding colour developer from one of a series of liquid developer troughs 57, 58, 59 and 60 which are brought selectively into a position above cams 69 and 70 by a transport device 56. Operation of the cams raises the selected trough into a developing position with a development electrode 65, 66, 67 or 68 adjacent the surface of drum 49. The images are fixed by heat from heaters 72 and the finished sheet is stripped from the drum by a device 73. The colour separation images are formed by positioning one of a series of coloured mirrors 34, 35, 36 and 37 in the path of light from an original a.

2. 发明专利

DE2165359C3 未知
公开(公告)号：DE2165359C3
公开(公告)日：1978-08-24
申请号：DE2165359
申请日：1971-12-29
申请人： MITA INDUSTRIAL CO. LTD., OSAKA (JAPAN)
发明人： MATSUMOTO, SHOJI, NEYAGAWA , YONAHA, NOBORU, HIRAKATA , AIZAWA, TATSUO, OSAKA
IPC分类号： G03G5/00 , G03G13/16 , G03G15/16
摘要： 1357629 Electrostatic printing MITA INDUSTRIAL CO Ltd 29 Dec 1971 [29 Dec 1970] 60530/71 Heading G2H [Also in Division B6] Electrostatic printing is carried out by forming an electrostatic image on a surface 4, suitably by electro-photographic means, and developing it with a toner 6 whose particles have a charge of the same polarity as that of the latent image, then contacting the surface 4 with an imagereceiving member 7 with electrical properties so chosen as to be able to receive the toner image without dissipation or disturbance of the latent image, which can be redeveloped for making of a second toner image. A charged insulating surface 4 may be exposed to a light image, and simultaneously subjected to a corona discharge which either is A.C. or of the opposite polarity to the charge previously given to the surface at 13. Then the entire surface is exposed to light 16, and a latent image is formed.

3. 发明专利

DE2165360B2 未知
公开(公告)号：DE2165360B2
公开(公告)日：1975-04-03
申请号：DE2165360
申请日：1971-12-29
申请人： MITA INDUSTRIAL CO. LTD., OSAKA (JAPAN)
发明人： MATSUMOTO, SHOJI, NEYAGAWA , YONAHA, NOBORU, HIRAKATA , AIZAWA, TATSUO, OSAKA
IPC分类号： G03G15/05 , G03G5/02 , G03G5/043 , G03G5/147 , G03G15/22 , G03G21/00 , G03G13/00 , G03G13/22
摘要： An electrophotographic process comprising the steps of (a) applying a first charge by means of direct current corona discharge to an overcoated photosensitive sheet consisting of a conductive base, a photoconductive layer and a surface insulating layer; (b) applying a second charge to the so charged sensitive sheet by means of a corona discharge current of asymmetrical wave form in which the discharge current of a polarity opposite that of the first charge is greater than that of the same polarity and the degree of asymmetry is sufficient to satisfy the specified requirements, and simultaneously exposing the sensitive sheet through or original having an image pattern of light and shadow: and (c) thereafter exposing the photosensitive sheet to an uniform illumination over the entire surface to form a latent electrostatic image of the light area and a latent electrostatic image of the dark area, which are of opposite polarity to each other.

4. 发明专利

DE2165359B2 未知
公开(公告)号：DE2165359B2
公开(公告)日：1974-08-22
申请号：DE2165359
申请日：1971-12-29
申请人： MITA INDUSTRIAL CO. LTD., OSAKA (JAPAN)
发明人： MATSUMOTO, SHOJI, NEYAGAWA , YONAHA, NOBORU, HIRAKATA , AIZAWA, TATSUO, OSAKA
IPC分类号： G03G5/00 , G03G13/16 , G03G15/16
摘要： 1357629 Electrostatic printing MITA INDUSTRIAL CO Ltd 29 Dec 1971 [29 Dec 1970] 60530/71 Heading G2H [Also in Division B6] Electrostatic printing is carried out by forming an electrostatic image on a surface 4, suitably by electro-photographic means, and developing it with a toner 6 whose particles have a charge of the same polarity as that of the latent image, then contacting the surface 4 with an imagereceiving member 7 with electrical properties so chosen as to be able to receive the toner image without dissipation or disturbance of the latent image, which can be redeveloped for making of a second toner image. A charged insulating surface 4 may be exposed to a light image, and simultaneously subjected to a corona discharge which either is A.C. or of the opposite polarity to the charge previously given to the surface at 13. Then the entire surface is exposed to light 16, and a latent image is formed.

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