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1. 发明专利

JP2003241471A IMAGE FORMING APPARATUS 审中-公开
公开(公告)号：JP2003241471A
公开(公告)日：2003-08-27
申请号：JP2002038906
申请日：2002-02-15
申请人： CANON KK
发明人： KIMURA SHIGEO
IPC分类号： G03G15/00 , G03G15/01 , G03G15/16
摘要： PROBLEM TO BE SOLVED: To provide an image forming apparatus made compact and inexpensive by preventing a density detection means from being used severally, and always accurately detecting density without being influenced by the condition of the surface of a transfer material carrying belt or an intermediate transfer body on which a developer image for detecting density is formed and capable of yielding a stable high-quality image as an image forming apparatus using a plurality of image carriers and performing image control by forming the developer image for detecting density. SOLUTION: The image forming apparatus is provided with a roller member 91 coming into contact with transfer material carrier 8 or the intermediate transfer body on a downstream side from a plurality of image carriers 1a to 1d in the moving direction of the carrier 8 or the intermediate transfer body, and the density detection means 92 installed to be opposed to the member 91 and detecting the image density of the developer image on the member 91. The developer image for detecting density is transferred and carried on the carrier 8 or the intermediate transfer body, and then transferred to the member 91 from the carrier 8 or the intermediate transfer body, and the image density of the developer image for detecting density on the member 91 is detected by the density detection means 92. Thus, an image forming condition for a plurality of image carriers 1a to 1d is controlled based on the result of detecting the density. COPYRIGHT: (C)2003,JPO

2. 发明专利

JP2002214851A IMAGE DENSITY CONTROLLER AND IMAGE FORMING APPARATUS HAVING THE SAME 失效
公开(公告)号：JP2002214851A
公开(公告)日：2002-07-31
申请号：JP2001006654
申请日：2001-01-15
申请人： CANON KK
发明人： OGATA TAKAO , KIMURA SHIGEO , MASUDA TSUNEJI , HASEGAWA KAZUHIRO
IPC分类号： G03G15/00
摘要： PROBLEM TO BE SOLVED: To stabilize image density, regardless of the differences among density sensors and variations in service life of the density sensors. SOLUTION: Light is emitted from a light-emitting element 13a toward a density detection patch image P formed on a photoreceptor drum 1. The light reflected from it is received by a light-receiving element 13b, thereby detecting an amount of receiving light. For example, if the density sensor 13 is soiled by a toner t due to the end of service life, the amounts of receiving light from the patch images P having the same density are changed. To counteract this, the amount of soil on the density sensor 13 is detected by a soil detection means 13f, by using the amount of receiving light reflected from a patch image non- forming area on the photoreceptor drum 1 before the end of service life (before being soiled: reference time) and the amount of receiving reflected light after the end of the service life (after being soiled: measurement time). Based upon the result of the detection, the output of the density sensor when measuring the patch image density is corrected according to a conversion table, thereby adjusting it to an output used at the reference time.

3. 发明专利

JP2002091156A DEVELOPING DEVICE 失效
公开(公告)号：JP2002091156A
公开(公告)日：2002-03-27
申请号：JP2000276863
申请日：2000-09-12
申请人： CANON KK
发明人： KIMURA SHIGEO , HIROBE FUMITAKE
IPC分类号： G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a developing device capable of accurately detecting toner concentration. SOLUTION: In this developing device provided with a developer carrier, a developing bias generation means and a toner concentration detection means, the surface of the detection window of the toner concentration detection means on a developing carrier side has a transmissive conductive coating film and further the outermost surface is coated with an insulating sheet. The conductive coating film is set to nearly the same potential as a developer carrier, and the insulating sheet is composed of transparent material electrified to have the same polarity as the triboelectrification polarity of toner by its friction with two-component developer.

4. 发明专利

JP2000293038A DEVELOPING DEVICE 失效
公开(公告)号：JP2000293038A
公开(公告)日：2000-10-20
申请号：JP9904699
申请日：1999-04-06
申请人： CANON KK
发明人： MASUDA TSUNEJI , KIMURA SHIGEO , OGATA TAKAO , HASEGAWA KAZUHIRO
IPC分类号： G03G15/09 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To obtain an image without causing transfer omission due to a toner flocculated body at the time of transfer by recovering the toner flocculated body from developer even when the toner flocculated body is formed because the diameter of two-component developer gets smaller. SOLUTION: The developer after development is restored into a developing container 41 by the rotation of a developing sleeve 42. Since a magnetic pole N2 being a repulsive magnetic pole to a position of a take-in pole N3 of a magnet 50 exists on the downstream side of the pole N3, the developer 54 is carried in a state where it is napped larger at the position of the magnetic pole N3 than the position of other magnetic poles, whereby the fluttering of the developer 54 is strong and the toner flocculated body 60 comes out from the developer 54. A recovery box 53 open to the sleeve 42 side is provided at the position near to the magnetic pole N3 for the sleeve 42, so that the toner flocculated body 60 coming out from the developer is recovered in the box 53 so as to prevent the toner flocculated body from being taken in the developer again because it drops into a developing chamber 45.

5. 发明专利

JP2000089550A DEVELOPING DEVICE AND IMAGE FORMING DEVICE PROVIDED WITH THE SAME 失效
公开(公告)号：JP2000089550A
公开(公告)日：2000-03-31
申请号：JP27428098
申请日：1998-09-11
申请人： CANON KK
发明人： KIMURA SHIGEO , MASUDA TSUNEJI , OGATA TAKAO , HASEGAWA KAZUHIRO
IPC分类号： G03G15/09 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a developing device which stirs toner supplied into a developer container, sufficiently mixes the toner and developer, and enables the efficient contact of the toner with carrier, thereby preventing partial transfer omission, white fog on an image, and toner scatter in the device, and an image forming device provided with the developing device. SOLUTION: In this developing device 9 where the non-magnetic toner is supplied into the developer container 8 via a supply port 16 provided in the developer container 8 for storing the developer containing the non-magnetic toner and the magnetic carrier and a second stirring screw 12, as a freely rotating screw body, for stirring the developer in the developer container 8 and carrying it to a specific position is provided, a magnet 17 which is disposed near the second screw 12 and generates a magnetic field is provided.

6. 发明专利

JP2000047489A IMAGE FORMING DEVICE 失效
公开(公告)号：JP2000047489A
公开(公告)日：2000-02-18
申请号：JP22863498
申请日：1998-07-29
申请人： CANON KK
发明人： MASUDA TSUNEJI , KIMURA SHIGEO
IPC分类号： G03G9/08 , G03G9/10 , G03G15/06 , G03G15/08 , G03G15/09
摘要： PROBLEM TO BE SOLVED: To stably carry a binary developer containing the toner and carrier made to smaller grain sizes, which reduces the carrying force of a developing sleeve, for a long period, and prevent the image failure such as image density unevenness. SOLUTION: A developing device for developing an electrostatic latent image on an image carrier comprises a developing sleeve 5 as a developer carrier having a magnet roller 62 as magnetic field generating means and the magnetic field generated by the magnetic roller 52 is set so that the developing sleeve 51-tangential directional (developer carrying directional) increasing rate of the absolute value of the magnetic field intensity generated by the magnet roller 52 is positive near the developing sleeve 51-rotating directional upper stream of a developing nip N (developing area), within the developing nip N, and near the developing sleeve 51-rotating directional lower stream of the developing nip N.

7. 发明专利

JPH11143231A DEVELOPING DEVICE 失效
公开(公告)号：JPH11143231A
公开(公告)日：1999-05-28
申请号：JP32957797
申请日：1997-11-13
申请人： CANON KK
发明人： MASUDA TSUNEJI , OGATA TAKAO , HASEGAWA KAZUHIRO , KIMURA SHIGEO
IPC分类号： G03G15/09 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To suck developer free from longitudinal unevenness of toner concentration on to a developer carrier, to attract and hold the developer by setting the developer dropping position outside the leading end of the sheet-like projection of a developer stirring/carrying member in a horizontal state on the developer carrier. SOLUTION: The developer dropping position P on the surface of a developing sleeve 20 is set outside the leading end of the horizontally positioned sheet- like projection 30 of the developer stirring/carrying member 23. Thus, the developer peeled off the developing sleeve 20 at the position P and with low concentration toner drops on the screw blade 28 which is positioned outside the leading end of the sheet-like projection 30. Thus, the developer is stirred/carried with nearby developer by the screw blade 28 before the developer is carried by the sheet-like projection 30 in a circumferential direction, then, the toner concentration in the developer is made uniform in the axial direction. Thereafter, the developer is carried by the projection 30 in the circumferential direction and sucked up from a position corresponding to the developer suction position Q of the developing sleeve 20, and then, attracted and held.

8. 发明专利

JPH09204102A DEVELOPING DEVICE AND IMAGE FORMING DEVICE 失效
公开(公告)号：JPH09204102A
公开(公告)日：1997-08-05
申请号：JP3124696
申请日：1996-01-26
申请人： CANON KK
发明人： KIMURA SHIGEO , HASHINASHI AKIRA
IPC分类号： G03G21/14 , G03G15/08 , G03G21/10
摘要： PROBLEM TO BE SOLVED: To prevent image deterioration which is caused by unsatisfactory electrification of toner, in a developing device, designed so as to hold only sufficiently electrified toner onto a developing sleeve, and image forming device using this. SOLUTION: When images are not being formed, the speed of the rotation of a developer restricting body 6a is decreased only for a specific length of time. Alternately, with the restricting body stopped, insufficiently electrified toner or toner containing much paper powder is held on the developing sleeve 1a to be carried to a developing area. This toner is transferred to a photoreceptive drum 11 and removed by a cleaner 9.

9. 发明专利

JPH08292657A TRANSFER DEVICE 失效
公开(公告)号：JPH08292657A
公开(公告)日：1996-11-05
申请号：JP9550195
申请日：1995-04-20
申请人： CANON KK
发明人： KIMURA SHIGEO
IPC分类号： G03G15/16
摘要： PURPOSE: To always stably obtain an excellent image and to prevent the soil of a transfer member and the deterioration of an image carrier from occurring in a paper non-passing area by preventing a defective transfer action from being executed. CONSTITUTION: The transfer member 3 is constituted of an electrical conductive brush 4 and plural flexible thin pieces 5 arrayed on the upstream side from the brush 4. Besides, it is constituted so that the brush 4 and the pieces 5 are bent to the vicinity of the back surface position of a transfer material P at the transfer part of a transfer material carrying path 2 from the upstream side position of the transfer part when they are normal. By such constitution, since the brush 3 is bent without being extended and surely brought into contact with the back surface of the material P even after the endurance thereof, the defective transfer action is prevented from being executed and the excellent image is stably obtained. Besides, since only the part of the transfer member 3 corresponding to the width of the material P is bent, the soil of the transfer member 3 and the deterioration of the photoreceptor 1 are prevented from occurring at the paper non-passing area.

10. 发明专利

JPH08262878A TRANSFER DEVICE 失效
公开(公告)号：JPH08262878A
公开(公告)日：1996-10-11
申请号：JP6060895
申请日：1995-03-20
申请人： CANON KK
发明人： KIMURA SHIGEO
IPC分类号： G03G21/00 , G03G15/16
摘要： PURPOSE: To provide a transfer device capable of remarkably miniaturizing a power source, etc., by making applied voltage required for a transfer lower than ones currently in use. CONSTITUTION: In the transfer device for transferring a transferable toner image formed on the surface of a photoreceptor drum (image carrier) 1 to a transfer material P, in such a manner that a voltage is applied to a transfer means coming into contact with the rear surface of the transfer material P in a transfer part, to impart a charge to the rear surface of the transfer material P, the transfer means is constituted of a brush electrode 3 including a flexible member (brush) which is flexibly curved up to the vicinity of the rear surface position of the transfer material P in the transfer part by the leading edge of the transfer material P carried from the upstream side of the transfer part and divided in a longitudinal direction and the voltage applied to the brush electrode 3 is controlled to make a current constant at least during a transfer process. Moreover, the volume resistance value of the electrode 3 is set 10 Ωcm Ωcm.

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