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41. 发明专利

JPH113022A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH113022A
公开(公告)日：1999-01-06
申请号：JP15638497
申请日：1997-06-13
申请人： SHARP KK
发明人： TAKEI YUICHIRO , AKAZAWA YOSHIAKI , NAKAMURA MASA , MURAKAMI TOSHIHIKO , SAITO JUNICHI , SAWAI MASAYUKI
IPC分类号： G03G15/00 , G03G15/043 , G03G15/08 , G03G21/14
摘要： PROBLEM TO BE SOLVED: To prevent the occurrence of image fogging and to always keep an image forming state good by setting a process condition with giving consideration to the conditions of the flowability of replenished toner and the preservable property of the toner. SOLUTION: In the case the output of an ATC(toner concentration) sensor is exceeding a reference value, the toner starts to be replenished by driving a toner replenishing motor, and the toner is continuously replenished until the output of the ATC sensor becomes equal to or below the reference value (s1 to s3). In this period, a replenishment time Ta counted by a timer is compared with a reference time T1 (s5), and in the case the replenishment time Ta is equal to or below the reference time T1, a process control A for increasing a developing bias as the replenishment time Ta is shortened is executed (s6), in the case the replenishment time Ta is exceeding the reference time T1, a process control B for increasing the developing bias Vb as the replenishment time Ta is prolonged is executed (s7).

42. 发明专利

JPH08234556A TONER CONCENTRATION CONTROLLER 失效
公开(公告)号：JPH08234556A
公开(公告)日：1996-09-13
申请号：JP3989795
申请日：1995-02-28
申请人： SHARP KK
发明人： MAEDA YASUTAKA , SAITO JUNICHI , KAZAKI YUUICHI , FUJITA SHOICHI , TAKAYA HIROKO , KITAMURA KEIZO
IPC分类号： G03G15/08
摘要： PURPOSE: To stably control the concentration of toner with high accuracy and to enhance image quality by preventing the concn. of the toner in a developing tank from being remarkably changed from a reference value, due to the increase and decrease of the quantity of developer in the developing tank. CONSTITUTION: When a new cartridge cartridge 31 is attached at the time of executing a normal copying operation, a value obtained by subtracting a prescribed quantity ΔS from a value S detected by a magnetic permeability sensor 24 is compared with a target values So, at the time of judging whether the toner is to be replenished or not, in a period until the value measured by a quantity sensor 51 for detecting the quantity of the developer in the developing tank 21 becomes a preset reference value or below. Then, the increase of the value measured by the permeability sensor 24 caused by the increase of the developer in the developing tank 21 at the beginning of the attachment of the new cartridge 31 is corrected by the subtraction of the prescribed quantity ΔS.

43. 发明专利

JPH07319202A ELECTROPHOTOGRAPHIC DEVELOPER 失效
公开(公告)号：JPH07319202A
公开(公告)日：1995-12-08
申请号：JP10996594
申请日：1994-05-24
申请人： SHARP KK
发明人： NAKANO NOBUHIKO , SAITO JUNICHI , OUCHI TAKEAKI , MORINISHI YASUHARU
IPC分类号： G03G9/087
摘要： PURPOSE:To produce a electrophotographic developer having well maintained preservable property. fixing property, resistance to offset, electrostatic property, etc., capable of satisfying various characteristics and being appropriate for a heat roller fixing method, especially, for so called high speed heat roller fixing method. CONSTITUTION:A resin for fixing incorporated in the electrophotographic developer is composed of a styren based polymer having a maximum value in a range of mol.wt. of 1X10 to 5X10 and a styren-acryl based copolymer having the maximum value in the range of mol.wt. of 3X10 to 1X10 . The wt. ratio of the styren based polymer to the styren-acryl based copolymer is (1/1) to (9/1). The wt. ratio of acryl based monomer to the copolymer is 0.05-0.3. The wt. ratio (a) of the acryl based monomer to the wt. ratio (b) of styren-acryl based copolymer in the resin for fixing satisfies a relation of 0.26

44. 发明专利

JPH0619185A TONER FOR ELECTROSTATIC IMAGE DEVELOPER 失效
公开(公告)号：JPH0619185A
公开(公告)日：1994-01-28
申请号：JP19268792
申请日：1992-06-29
申请人： SHARP KK
发明人： SAITO JUNICHI , OUCHI TAKEAKI , NAKANO NOBUHIKO , HIRAGA YUJI
IPC分类号： G03G9/08
摘要： PURPOSE:To make a binder resin of the toner flame-retardant, to avoid fire, and to obtain an electrostatic image developing toner having property combination of flame-retardant material and a binder resin to be compounded into the toner without influencing the image output. CONSTITUTION:This toner contains a flame-retardant by 0.1-120 pts.wt. to 100 pts.wt. of the toner. The combination of the binder resin as the main component of the toner and the flame retardant is at least one of the followings.

45. 发明专利

JP2003149854A ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER 审中-公开
公开(公告)号：JP2003149854A
公开(公告)日：2003-05-21
申请号：JP2001346864
申请日：2001-11-13
申请人： SHARP KK
发明人： BITO TAKAHIRO , IMAFUKU TATSUO , SAITO JUNICHI
IPC分类号： G03G9/08 , G03G5/10 , G03G9/087 , G03G15/00
摘要： PROBLEM TO BE SOLVED: To provide an electrostatic charge image developing toner capable of preventing increase of copy fog in an environment at high temperature and high humidity which are the severest conditions for copy fog and lowering of copy density in an environment at low temperature and low humidity which are the severest conditions for copy density, capable of preventing sticking (filming) of a magnetic fine powder on a photosensitive drum by adding a magnetic fine powder B different from a magnetic fine powder A in particle diameter in an amount between an amount (pt.wt.) equal to the amount of the powder A and 0.8 pt.wt. and capable of achieving stable image quality of a copy in any environment. SOLUTION: The electrostatic charge image developing toner used in a binary developer consists essentially of a styrene-acrylic bonding resin, a colorant and an electrostatic charge controlling agent, wherein a magnetic fine powder A is used as an additive in an amount of 0.6-0.8 pt.wt. The magnetic fine powder A has an aminosilane group on the surface, the shape is octahedral and the electric resistance ra (Ω.cm) satisfies the condition of 1×10 .

46. 发明专利

JP2003131437A ELECTROPHOTOGRAPHIC DEVELOPER, IMAGE FORMING METHOD AND APPARATUS 审中-公开
公开(公告)号：JP2003131437A
公开(公告)日：2003-05-09
申请号：JP2001331130
申请日：2001-10-29
申请人： SHARP KK
发明人： IMAFUKU TATSUO , SAITO JUNICHI , BITO TAKAHIRO
IPC分类号： G03G9/08 , G03G9/083 , G03G9/097 , G03G9/113
摘要： PROBLEM TO BE SOLVED: To provide an electrophotographic developer comprising a durable carrier which has high developing ability, effectively prevents so-called spending, that is, formation of a toner film on its surface and is free of impairment of excellent characteristics even in long-term use and a toner which retains excellent characteristics over a long period of time in various environments when combined with the carrier and to provide an image forming method and apparatus. SOLUTION: In the two-component electrophotographic developer having the above toner and carrier, the toner has a magnetic powder as an additive, the carrier is a resin coated magnetic carrier having a true specific gravity of 6.0-8.0 and the coating resin is a silicone resin containing a crosslinker having phenyl groups and an aminosilane coupling agent. The proportion of the phenyl groups in the crosslinker in the coating resin of the carrier is 0.2-15% by number.

47. 发明专利

JP2002072552A ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER AND METHOD FOR FORMING IMAGE 失效
公开(公告)号：JP2002072552A
公开(公告)日：2002-03-12
申请号：JP2000252794
申请日：2000-08-23
申请人： SHARP KK
发明人： IMAFUKU TATSUO , SAITO JUNICHI , AKAZAWA YOSHIAKI , BITO TAKAHIRO , TAKEI YUICHIRO
IPC分类号： G03G9/08 , G03G9/083 , G03G9/087 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a toner which does not cause deterioration in the image quality by the trace of fixing and peeling claws even if the peeling claws slide on the image surface immediately after being fixed. SOLUTION: The electrostatic charge image developing toner, containing at least binder resin, coloring agent, electrification controlling agent and magnetic fine powder in the toner particles, has the features including: (1) the binder resin consists of a styrene polymer having 145 to 165 deg.C softening point; (2) the loss elastic modulus G" of the binder resin ranges from 1×104 dyne/cm2 to 2×104 dyne/cm2 at 140 deg.C; (3) the weight-average particle size of the toner particles is in the range of 7.5 to 10.5 μm; and (4) the absolute specific gravity of the toner particles ranges from 1.1 to 1.3. In the method for forming images, a two-component developer is prepared by mixing the electrostatic charge image developing toner with a magnetic carrier and then electrified and deposited on the surface of a developer carrying both provided with a magnet, and then the toner is deposited to an electrostatic charge image on an electrostatic charge image holding body to develop the image.

48. 发明专利

JP2001117276A METHOD OF PRODUCING ELECTROPHOTOGRAPHIC TONER, ELECTROPHOTOGRAPHIC TONER OBTAINED BY THAT METHOD AND METHOD AND DEVICE FOR FORMATION OF IMAGE USING THAT TONER 失效
公开(公告)号：JP2001117276A
公开(公告)日：2001-04-27
申请号：JP30115599
申请日：1999-10-22
申请人： SHARP KK
发明人： BITO TAKAHIRO , IMAFUKU TATSUO , SAITO JUNICHI , ISHIDA TOSHINAO
IPC分类号： G03G9/087
摘要： PROBLEM TO BE SOLVED: To improve the dispersibility of the structural components of a toner in a dispersing and mixing process in the production of a toner and to provide a toner which has stability in the performance and picture quality. SOLUTION: In the method of producing an electrophotographic toner, the structural components of an electrophotographic toner containing a spherical binder resin, irregular resin particles having a smaller average particle diameter than that of the binder resin, and a coloring agent as the essential components are dispersed and mixed, and then the mixture is molten, kneaded, pulverized and classified to obtain the electrophotographic toner.

49. 发明专利

JPH08201344A TONER CONCENTRATION CONTROL DEVICE 失效
公开(公告)号：JPH08201344A
公开(公告)日：1996-08-09
申请号：JP1054195
申请日：1995-01-26
申请人： SHARP KK
发明人： FUJITA SHOICHI , TAKENOUCHI KOICHI , KITAMURA KEIZO , KAZAKI YUUICHI , SAITO JUNICHI , TAKAYA HIROKO
IPC分类号： G01N27/72 , G03G15/08
摘要： PURPOSE: To stably control the toner concentration by using part of a lower frame in a developing tank as the head section of a toner concentration sensor, and providing a means moving the coil section of the toner concentration sensor in parallel with the head section at the outside lower section of the developing tank. CONSTITUTION: A sensor coil section 35 installed at the bottom section of a developing tank is operated by a rotary motor 37 freely controlled for the rotating direction by a drive screw 36, and the sensor coil section 35 is operated in a range A-B. The toner concentration reference value of a sensor is set at the point C of the sensor of a developing device. The reciprocating motion of the sensor is made in the range A-B for each set number of copies or when a power source is turned on or off, the average value of the toner concentration level in the range A-B is calculated against the initially set reference value, and the toner concentration is controlled.

50. 发明专利

JPH07319200A ELECTROPHOTOGRAPHIC DEVELOPER 失效
公开(公告)号：JPH07319200A
公开(公告)日：1995-12-08
申请号：JP10824094
申请日：1994-05-23
申请人： SHARP KK
发明人： NAKANO NOBUHIKO , SAITO JUNICHI , OUCHI TAKEAKI , MORINISHI YASUHARU
IPC分类号： G03G9/08 , G03G15/08
摘要： PURPOSE:To attain a stable image forming state from the initial stage of development by exactly regulating the amt. of an additive added to a toner for a start developer and that added to a toner for replenishment. CONSTITUTION:Silica, titanium oxide or a mixture of them is added to a toner for a start developer by 0.05-0.5wt.%, the additive is added to a toner for replenishment by 0.05-0.5wt.% and the amt. of the additive added to the toner for replenishment is made larger than that added to the toner for the start developer by

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