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1. 发明专利

JP2002108096A APPARATUS AND PROCESS UNIT FOR FORMING IMAGE 失效
公开(公告)号：JP2002108096A
公开(公告)日：2002-04-10
申请号：JP2000299011
申请日：2000-09-29
申请人： RICOH KK
发明人： KOYAMA HAJIME , AOKI KATSUHIRO , HODOSHIMA TAKASHI
IPC分类号： G03G9/08 , G03G5/04 , G03G15/06 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide an apparatus and a process unit for forming an image by which a low-electric potential phenomenon can be realized, staining can be restrained and the image of the prescribed density can be formed. SOLUTION: When capacitance and electric resistance between an electrically conductive substrate 402B of a developing roller 402 and the surface of a photosensitive layer 1P of a photoreceptor drum 1 in the developing region A1 are defined as CD [F/cm2] and RD (=RR1+RR2+RDG) [Ω/cm2] respectively and capacitance and electric resistance in the thickness direction of the layer 1P are defined as CP [F/cm2] and RP [Ω/cm2] respectively, each value of CD, RD, CP and RP is set so that the absolute value of the charge amount QP per unit area to be charged in the capacitance CP of the layer 1P in such a developing region passage time that the surface of the layer 1P moves and passes on the region A1 is 2.5×10-9 [C/cm2] or larger under the condition that the absolute value of the developing potential (VL-VB) being the difference between the image part potential VL of the drum 1 and the developing bias voltage VB is 300 V or smaller.

2. 发明专利

JP2002062717A DEVELOPING APPARATUS AND IMAGE FORMING APPARATUS 失效
公开(公告)号：JP2002062717A
公开(公告)日：2002-02-28
申请号：JP2000251977
申请日：2000-08-23
申请人： RICOH KK
发明人： KOYAMA HAJIME , AOKI KATSUHIRO , HODOSHIMA TAKASHI
IPC分类号： G03G15/06 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a developing apparatus and an image forming apparatus, capable of preventing serious fault from occurring by restraining overcurrent in a current path via a toner supply area, when the absolute value of the surface potential of a developing roller is lowered to abnormalitive, without providing an automatic shielding circuit based on the detection of the excess current. SOLUTION: In this developing device equipped with the developing roller 402, a supply roller 403, a developing bias power source 412 and a toner supply bias power source 413, the electrical resistance between the surface of the roller 403 and the power source 413 is made larger than that between the surface of the roller 402 and the power source 412. For example, a protective resistance layer (high resistance part) 409, consisting of high resistance material, is formed on the surface of a sleeve 408 constituting the roller 403.

3. 发明专利

JP2001272858A DEVELOPING DEVICE, IMAGE FORMING APPARATUS AND IMAGE FORMING PROCESSING UNIT 失效
公开(公告)号：JP2001272858A
公开(公告)日：2001-10-05
申请号：JP2000085397
申请日：2000-03-24
申请人： RICOH KK
发明人： AOKI KATSUHIRO , KOYAMA HAJIME , HODOSHIMA TAKASHI
IPC分类号： G03G9/08 , G03G9/10 , G03G15/06 , G03G15/08 , G03G15/09
摘要： PROBLEM TO BE SOLVED: To provide a developing device, a printer and an image forming processing unit where a contact member for triboelectric toner on a developing roller need not be provided and by which a high-quality toner image having no density irregularity on a low-contrast image continuous to an image partially having a solid image can be formed. SOLUTION: This developing device is equipped with a developing roller 402 carrying the toner and a magnetic brush roller 403 carrying two-component developer 12, feeding it to a toner supply area A2 and supplying only the toner 10 from the developer 12 to the roller 402. Then, a toner supply condition by the roller 403 is set so that the toner of maximum carrying amount per unit area on the surface of the roller 402 is supplied to be carried on the surface of the roller 402 when the surface of the roller 402 where the toner is not carried passes through a toner supply area A2 once.

4. 发明专利

JP2001005280A DEVELOPING DEVICE AND IMAGE FORMING DEVICE 失效
公开(公告)号：JP2001005280A
公开(公告)日：2001-01-12
申请号：JP17111599
申请日：1999-06-17
申请人： RICOH KK
发明人： KOYAMA HAJIME
IPC分类号： G03G21/00 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To maintain the excellent quality, homogeneity and stability of an image over a long term by preventing the temperature rising of a developer carrier surface by providing a cooling means performing cooling by taking away frictional heat generated on the developer carrier surface at a developer eliminating means and a developer supplying means. SOLUTION: A toner supply roller 12 abuts on an upstream side in a rotating direction from the abutting part of the toner thinning blade 14 of a developing roller 11 by specified pressure, and is rotatably installed in the direction of an arrow (c), and has a function to cool the surface of the developer 11 and toner T. The toner supply roller 12 is constituted by forming a non-closed-cell foam elastic layer on the outer peripheral surface of a hollow cylindrical supporting member consisting of a porous member having communicative holes, and cooling air is supplied from both ends of the hollow part of the toner supply roller 12 by an air blowing fan. The cooling air supplied is discharged from an outer peripheral surface by passing through the communicative holes of the hollow cylindrical supporting member and the non-closed-cell foam elastic layer, and cools the toner T on the surface of the developing roller 11 and in the periphery of the toner supply roller 12.

5. 发明专利

JPH11249409A DEVELOPING DEVICE 失效
公开(公告)号：JPH11249409A
公开(公告)日：1999-09-17
申请号：JP6942898
申请日：1998-03-03
申请人： RICOH KK
发明人： UMEZAWA NOBUHIKO , KOYAMA HAJIME , FUJISHIRO TAKATSUGU , HANADA MOTONORI
IPC分类号： G03G15/08
摘要： PROBLEM TO BE SOLVED: To make toner in a developer always stably and excellently charged and to prevent a ground stain from occurring, regardless of the charge of charging capability of a developing device due to using environment, using history and the like, in an image forming device adopting the developing device provided with a toner concentration self controlling function. SOLUTION: In the time forming device adopting the developing device 1 provided with a developing roller 2 carrying the two component developer 8 incorporating toner and magnetic particles for transporting to a developing area facing a photoreceptor 30, the developer controlling member 3 controlling the electric quantity of the carried developer, the developer container 6 containing the developer 8, and the toner container 7 containing the toner, and then constituted so that the replenishing quantity of the toner from the toner container 7 base on the volume of the developer in the developer container 6, the pattern for detecting density is formed outside the image area on the photoreceptor. Then, the device is allowed to detect the density of this pattern by the density sensor 34, so as to increase/decrease the capacity of the developer container 6 based on the detecting result, and to control the toner quantity replenished in the developer corresponding to the chargeability change of the developing device 1.

6. 发明专利

JPH11194593A DEVELOPING DEVICE 失效
公开(公告)号：JPH11194593A
公开(公告)日：1999-07-21
申请号：JP1208398
申请日：1998-01-05
申请人： RICOH KK
发明人： KOYAMA HAJIME , FUJISHIRO TAKATSUGU , UMEZAWA NOBUHIKO , HANADA MOTONORI
IPC分类号： G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a two-component developing device obtaining a high-quality image by finely dispersing toner in a developer, and satisfactorily electrifying the toner. SOLUTION: This developing device is provided with a developing roller 1 carrying a two-component developer 4 via magnetic force and rotated and a developer storage section 2 having a rotary developer stirring member 10 stirring and conveying the developer 4 and toner 7. The developer stirring member 10 is constituted of a developer stirring section 3 rotated around a rotary shaft 23 serving as the rotation center to stir the developer 4, and the developer stirring section 3 is arranged so that a void where the developer 4 can freely pass is formed near the rotary shaft 23. The developer stirring section 3 finely disperses the supplied toner 7 into the developer 4 and fully stirs it while it is slowly conveyed to the feeding position to the developing roller 1, therefore a carrier and the toner 7 are easily friction-electrified, and the satisfactorily electrified toner 7 is fed to the developing roller 1.

7. 发明专利

JPH1144992A DEVELOPING DEVICE 失效
公开(公告)号：JPH1144992A
公开(公告)日：1999-02-16
申请号：JP21583897
申请日：1997-07-25
申请人： RICOH KK
发明人： HANADA MOTONORI , KOYAMA HAJIME , FUJISHIRO TAKAMITSU , UMEZAWA NOBUHIKO
IPC分类号： G03G15/09 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a developing device capable of promoting triboelectrification of toner, without providing a developer agitating mechanism, and efficiently replenishing a developing roller with the toner while being easy in miniaturization and cost reduction. SOLUTION: This device is provided with a replenishment opening 5a for the toner of a toner container 5, at a position opposite to a developer circulation area in which a circulating movement is caused to the developer 11 by the magnetic force of the developing roller 3. In such a manner, the toner 10 replenished from the toner replenishment opening 5a, without providing a special developer agitating mechanism as feeding means for the developer, is agitated by circulation movement (rotary movement) of the developer by the magnetic force of the developing roller 3 to be triboelectrified, and at the same time, the toner is efficiently taken-in from the toner replenishment opening 5a of the toner container 5 toward the developing roller 3 by the rotary movement of the developer 11.

8. 发明专利

JPH112960A DEVELOPING DEVICE 失效
公开(公告)号：JPH112960A
公开(公告)日：1999-01-06
申请号：JP17329997
申请日：1997-06-12
申请人： RICOH KK
发明人： TAKAGAKI HIROMITSU , KOYAMA HAJIME , HANADA MOTONORI , AOKI KATSUHIRO , FUJISHIRO UKOU
IPC分类号： G03G15/08
摘要： PROBLEM TO BE SOLVED: To improve, by a simple mounting structure, positional accuracy in mounting a developer scatter prevention member, such as an entrance seal or a shield plate, to a developing device. SOLUTION: Engagement parts 21a and 21b, consisting of cuts, slits, or the like, which are formed in proper areas of the developer scatter prevention member 21 are engaged with positioning projections 31a and 31b formed on a side plate 31 integrated with a developer container 3 substantially. Thus, the developer scatter prevention member 21 is accurately positioned in relation to the developer container 3.

9. 发明专利

JPH09204072A COLOR TONER 失效
公开(公告)号：JPH09204072A
公开(公告)日：1997-08-05
申请号：JP3299696
申请日：1996-01-26
申请人： RICOH KK
发明人： KOYAMA HAJIME
IPC分类号： G03G9/09 , G03G9/08 , G03G15/01
摘要： PROBLEM TO BE SOLVED: To improve the electrification property of a toner and to obtain enough fluidity even for repeated use by internally adding a light-transmitting resistance decreasing material having specified volume specific resistance to an insulating color toner containing a binder resin and a coloring agent. SOLUTION: A light-transmitting resistance decreasing material is internally added to an insulating color toner containing a binder resin such as a polyester resin and a coloring agent such as a disazo pigment. This resistance decreasing material has the volume specific resistance ρ2 which satisfies ρ1>ρ2, in which ρ1 is the specific resistance of the mixture component of only the binder resin and the coloring agent. As for the resistance decreasing material, a conductive fine powder such as zinc oxide or a conductive polymer with dispersion of the conductive fine powder or a composite material of these can be used. The volume specific resistance ρ1 of the mixture component of only the binder resin and the coloring agent is specified to 10 to 10 Ω.cm, while the volume specific resistance ρ2 of the resistance decreasing material is specified to Ω.cm. The resistance decreasing material is mixed in the mixture component to obtain 10 to 10 Ω.cm volume specific resistance of the toner produced.

10. 发明专利

JPH09185261A DEVELOPING DEVICE 失效
公开(公告)号：JPH09185261A
公开(公告)日：1997-07-15
申请号：JP27549396
申请日：1996-09-26
申请人： RICOH KK
发明人： KOYAMA HAJIME , OKA SEIJI , TSUDA KIYONORI , AKIBA YASUSHI
IPC分类号： G03G15/09 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a developing device constituted so that a desired developing state can be stably maintained by suppressing the retention of developer in a developing area even when the toner concentration of the developer of a developing sleeve carried to the developing area becomes ununiform for some reason or other. SOLUTION: This developing device is constituted so that a latent image on a photoreceptor drum 1 is developed in a state where the developer on the developing sleeve 4 is brought into contact with the surface of the drum 1 and toner is fetched in the developer by the movement of the developer accompanied with the developer carrying action of the sleeve 4. Then, the developer on the sleeve 4 is prevented from being retained in the developing area by making the miximum filling coefficient ρ2 of the developer on the sleeve 4 in the developing area smaller than the filling coefficient ρ1 of the developer when it is passed through the doctor 6 by setting a gap Gp between the surface of the sleeve 4 and the surface of the drum 1 in the developing area to be larger than a gap Cd between the surface of the sleeve 4 and the tip of a doctor 6.

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