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1. 发明专利

JP2003167480A DEVELOPING DEVICE AND IMAGE FORMING APPARATUS EQUIPPED THEREWITH 审中-公开
公开(公告)号：JP2003167480A
公开(公告)日：2003-06-13
申请号：JP2001369246
申请日：2001-12-03
申请人： CANON KK
发明人： HIROBE FUMITAKE
IPC分类号： G03G21/00 , G03G15/01 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a developing device capable of preventing the change of the height of a developer level by environment, and an image forming apparatus equipped with the developing device. SOLUTION: In this developing device, developer (t) with which an electrostatic latent image formed on an image carrier 100 is developed is stored in a developing container 2, and also a developer carrier 10 is rotatably provided at a position where it is opposed to the image carrier 100 of the container 2, and the developer (t) is transported to a developing part P formed between the image carrier 100 and the developer carrier 10 by using the developer carrier 10. Furthermore, developer carrying members 4 and 6 are provided in the container 2, and the developer (t) is stirred and circulated by the carrying members 4 and 6. Then, temperature and humidity in the container 2 are detected by a temperature and humidity detection means 40, and a control means 41 controls the rotating speed of the carrying members 4 and 6 in accordance with the temperature and the humidity detected by the detection means 40, and the height of the developer level is kept at a specified value. COPYRIGHT: (C)2003,JPO

2. 发明专利

JP2001194876A IMAGE FORMING DEVICE 失效
公开(公告)号：JP2001194876A
公开(公告)日：2001-07-19
申请号：JP2000004965
申请日：2000-01-13
申请人： CANON KK
发明人： SAKAMI YUJI , KIMURA SHIGEO , HIROBE FUMITAKE
IPC分类号： G03G15/00 , G03G15/06
摘要： PROBLEM TO BE SOLVED: To prevent a highlight part form becoming rough, to obtain sufficient image density and to obtain an image having no defect caused due to abnormal discharge by applying appropriate developing bias. SOLUTION: BP bias consisting of a quiescent part and an oscillating part is applied as the developing bias. The force of toner in a flying direction to a photoreceptor drum becomes maximum when the oscillating part is applied and electric field in the flying direction is formed. The amount of the toner adhering to an image part depends on toner speed accelerated by the electric field when the BP bias changes from the oscillating part to the quiescent part. The oscillating part is formed by four pulses. Just after the quiescent part, a voltage of +900V is applied to the potential of the quiescent part for a time T1 as the electric field to return the toner to a developing sleeve, thereafter, -900V is applied for a time T2, and further +900V is applied for the time T1, finally -900V is applied for the time T1 as the electric field in the direction where the toner is made to fly to the photoreceptor drum, then the quiescent part arrives. T1 is set greater than T2.

3. 发明专利

JPH10333420A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH10333420A
公开(公告)日：1998-12-18
申请号：JP16180997
申请日：1997-06-04
申请人： CANON KK
发明人： HIROBE FUMITAKE , SAKAMI YUJI , MATSUZAKI SHIGERU , OKUMA KEIKO
IPC分类号： G03G15/08
摘要： PROBLEM TO BE SOLVED: To obtain a high-quality color image whose density is constant even when the developing performance of toner and the toner consumption of a toner consumption system are changed caused by environmental fluctuation. SOLUTION: This device is provided with a patch detection ATR (density controller) and a developer reflection ATR as the density controller. By detecting patch density corresponding to the real image density by using the patch detection ATR and comparing it with the initial density of a patch image, density difference is found. Then, the required quantity of toner is calculated. Besides, the required toner quantity is converted to a toner replenishment signal level and the feedback thereof is executed with respect to the developer reflection ATR. By calculating toner concentration by using the developer reflection ATR, a toner replenishment control coefficient α is calculated. Then, real toner replenishment quantity is calculated by multiplying simultaneously calculated toner replenishment quantity by the coefficient α. Then, the toner is replenished so as to control the density of the image.

4. 发明专利

JPH09127780A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH09127780A
公开(公告)日：1997-05-16
申请号：JP30230095
申请日：1995-10-27
申请人： CANON KK
发明人： HIROBE FUMITAKE
IPC分类号： G03G21/00 , G03G15/08 , G03G15/09 , H04N1/23
摘要： PROBLEM TO BE SOLVED: To stabilize a toner quantity by estimating the total toner consumption of every image based on image density information and driving a developer concentration controller in accordance with the total toner consumption so that toner supply quantity may be decided. SOLUTION: The image area rate of an original is calculated based on the video count C1 integrated by a counter 66. The image area rate is obtained by proportional calculation with the solid black video counted number as 100% so as to obtain the toner quantity necessary for the surface of paper. Then, a replenishment system is changed according to the obtained toner quantity (DTOTAL) required in the course of a copying sequence. To put it concretely, replenishment is performed by halving DTOTAL. The first case is that DTOTAL causes the change ∞0.5% in TC ratio (the ratio of the toner quantity to the total quantity of developer). In such a case, predictive replenishment is performed by using the video counted ATR so that the toner quantity near a developing sleeve may not be decreased suddenly. In the second case that DTOTAL does not cause the change

5. 发明专利

JP2003255696A DEVELOPING DEVICE AND IMAGE FORMING APPARATUS 审中-公开
公开(公告)号：JP2003255696A
公开(公告)日：2003-09-10
申请号：JP2002059334
申请日：2002-03-05
申请人： CANON KK
发明人： HIROBE FUMITAKE
IPC分类号： G03G9/10 , G03G15/08 , G03G15/09
摘要： PROBLEM TO BE SOLVED: To prevent an irregular layer thickness of developer on a developing sleeve by keeping the developer supply amount to the developing sleeve constant even when the rotating speed of the developing sleeve is changed. SOLUTION: Under the control of a controller 22, the developing sleeve 11 is driven to be rotated by a 1st driving source 20 and developer carrying screws 16 and 17 are driven to be rotated by a 2nd driving source 21, whereby the rotating speed of the screws 16 and 17 is kept constant even in the case of changing the rotating speed of the sleeve 11 in accordance with the change of processing speed. Therefore, a developer surface in a developer container 10 is kept constant even when the rotating speed of a photoreceptor drum 1 is changed, and the developer supply amount to the sleeve 11 can be stably and constantly maintained. COPYRIGHT: (C)2003,JPO

6. 发明专利

JP2000206791A DEVELOPING DEVICE 失效
公开(公告)号：JP2000206791A
公开(公告)日：2000-07-28
申请号：JP1104899
申请日：1999-01-19
申请人： CANON KK
发明人： MATSUZAKI SHIGERU , SAKAMI YUJI , HIROBE FUMITAKE
IPC分类号： G03G15/09
摘要： PROBLEM TO BE SOLVED: To provide a developing device capable of stably obtaining good quality images for a long time without forming flocculated body and the welded body of developer, the staining of a recording paper caused by the leaking of the flocculated body and the welded body from a developer container, and the staining of the inside of an image forming device by preventing magnetic developer from entering a gap between the magnet of end part sealing means set on both end parts of a developer carrier and the developer carrier. SOLUTION: A magnetic plate 3 constituting another end part sealing member set on both end parts of the developing sleeve is bent in the end part direction of the developer container in the vicinity of an N3 pole on an upstream side in the repulsing magnetic pole of a magnet roller inside the sleeve, so as to store a developer 8 pushed in the end part direction before a bent part 3a. At that time, the size of the part 3a is controlled so that the part 3a is positioned inside an area where the maximum value of the magnetic induction of magnetic force from the magnetic pole N3 exceeds 200 gauss, in order to restrain the stored developer 8 by the magnetic force.

7. 发明专利

JPH10282791A DEVELOPING DEVICE 失效
公开(公告)号：JPH10282791A
公开(公告)日：1998-10-23
申请号：JP8809997
申请日：1997-04-07
申请人： CANON KK
发明人： SAKAMI YUJI , HIROBE FUMITAKE , MATSUZAKI SHIGERU , OKUMA KEIKO
IPC分类号： G03G15/09 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a developing device capable of attaining complete sealing against a developer by using magnetic brushes. SOLUTION: The developing device comprises a developing container, a developer carrier 10 having a magnetic field generating means for forming a repulsing magnetic pole and rotating in a state where the developer is held, and magnetic members provided at the end parts of the developer carrier 10, with fixed gaps to the periphery of the carrier 10. In such a case, which the fixed gaps to the periphery of a part of the carrier 10 are formed, on the far end part sides from the position of the magnetic members plate-like magnets 26 magnetized with plural alternate magnetic poles, N and S, on the surfaces are arranged. The respective magnetic pole N or S of the plate-like magnet 26 is arranged so that the direction of the boundary line is the direction of the sum of a vector that indicates the carrying direction of the developer and a vector being in parallel with the axial direction of the rotation of the carrier 10 and going to the inside of the developing container and the direction where an inclination to the carrying direction of the developer is 5 deg.

8. 发明专利

JPH1039613A DEVELOPING DEVICE 失效
公开(公告)号：JPH1039613A
公开(公告)日：1998-02-13
申请号：JP19079696
申请日：1996-07-19
申请人： CANON KK
发明人： MATSUZAKI SHIGERU , SAKAMI YUJI , OKI SHIGERU , HIROBE FUMITAKE , IZUMIZAKI MASAMI , OGATA TAKAO , YOSHIKAWA TADANOBU , KITAYAMA KUNIHIKO
IPC分类号： G03G15/09 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To prevent deterioration and resident of developing agent and supply efficient developing agent on a developing sleeve and provide an uniform layer thickness. SOLUTION: A draw pole N2 for carrying developing agent and a cut pole S2 for causing magnetic field in a restraining part for restraining amount of the developing agent are mounted in a developing sleeve 3 and satisfies a-b>60,0 84 when (a) (Gauss) is maximum flux density of the draw pole N2, (b) (Gauss) is maximum flux density of the cut pole S2, θ1 (degree) is angle of depression of the draw pole N2 from center of the developing sleeve 3 and θ2 (degree) is angle θ2 between the cut pole S2 and the draw pole N2.

9. 发明专利

JPH1026878A DEVELOPING DEVICE 失效
公开(公告)号：JPH1026878A
公开(公告)日：1998-01-27
申请号：JP18324396
申请日：1996-07-12
申请人： CANON KK
发明人： OGATA TAKAO , IZUMIZAKI MASAMI , SAKAMI YUJI , OKI SHIGERU , MATSUZAKI SHIGERU , HIROBE FUMITAKE , YOSHIKAWA TADANOBU , KITAYAMA KUNIHIKO
IPC分类号： G03G15/08
摘要： PROBLEM TO BE SOLVED: To accurately detect the ratio of toner to carrier and to form a uniform image by providing a partition dividing into a developing chamber and a stirring chamber between stirring screws and making the upper opening part of the partition large at a position corresponding to a detecting sensor in the longitudinal direction of a developing sleeve. SOLUTION: The partition 6 provided between the stirring screws 11 and 12 divides into the developing chamber 13 equipped with a developer compressing member 1 keeping the electrostatic charge amount of two- component developer uniform, the developing sleeve 3 carrying and supplying the developer to a developing nip, the developer detecting sensor 7 detecting the mixing ratio of the toner to the carrier in the developer and the stirring screw 11, and the stirring chamber 14 equipped with the stirring screw 12. The partition 6 is notched at the position corresponding to the sensor 7 and the height of the upper opening part of the partition 6 is made large in the longitudinal direction of the sleeve 3. Thus, the fluctuation of the carrying amount of the developer is restrained, and the pressure of the developer applied to the sensor 7 is kept constant, so that output from the sensor 7 becomes stable.

10. 发明专利

JP2003215919A DEVELOPING DEVICE 审中-公开
公开(公告)号：JP2003215919A
公开(公告)日：2003-07-30
申请号：JP2002018505
申请日：2002-01-28
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 prevent developer from caking at the end part a screw. SOLUTION: In a developing device which possesses a storing container to store the developer 11 provided with magnetic particles, a rotatable developer stirring member having a shaft consisting of a ferromagnetic substance, a bearing part to support the shaft 1 of the stirring member, an unrotatable magnet member 8 arranged so as to surround the shaft 1 by leaving an interstice with the shaft 1 at a position at the inside of the storing container from the bearing part and by which the leakage of the developer 11 is suppressed by forming the magnetic brush of the magnetic particles of a magnetic field formed between the shaft 1 of the stirring member and the magnet member 8, the edge of the surface of the magnet member 8 opposed to the shaft 1 of the stirring member is chamfered. COPYRIGHT: (C)2003,JPO

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