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111. 发明专利

JPH03252685A DEVELOPING DEVICE 失效
公开(公告)号：JPH03252685A
公开(公告)日：1991-11-11
申请号：JP5131690
申请日：1990-03-02
申请人： HITACHI METALS LTD
发明人： GOTO TAKAHARU , NOGUCHI KOJI , ASANAE MASUMI
IPC分类号： G03G15/09 , G03G15/08
摘要： PURPOSE:To properly control toner concentration and to stably form effective images even at the slow carrying speed of a developer by allowing only a sleeve to optionally rotate and allowing a detection means for detecting the developer stored in the bottom of a toner retainer in the vicinity of the sleeve to interlock with a toner feeding roll. CONSTITUTION:A magnetic carrier means 3 is constituted of the sleeve 4 and a permanent magnetic member 5 formed coaxially with the sleeve 4 and the sleeve 4 is formed so as to be optionally rotated. When the toner density of the developer 2 on the sleeve 4 is proper, the quantity of the developer stored in the vicinity of the sleeve 4 existing on the bottom part of the toner retainer 1 is held at a prescribed value and the feeding of excess magnetic toner 11 is stopped, and only when the quantity of the developer 2 is less than the prescribed quantity, a toner feeding roll 10 arranged on the upper part of the toner retainer 1 is driven by a signal outputted from the detection means 8 to feed the toner 11. Consequently, the developer 2 can be carried at a slow speed, the toner concentration can be controlled to a proper value and effective images can be stably formed.

112. 发明专利

JPH03197966A MAGNETIC TONER 失效
公开(公告)号：JPH03197966A
公开(公告)日：1991-08-29
申请号：JP33906189
申请日：1989-12-27
申请人： HITACHI METALS LTD
发明人： ASANAE MASUMI
IPC分类号： G03G9/083
摘要： PURPOSE:To prevent the formation of nonmagnetic particles or weakly magnetic particles even in the case of a reduced particle size and reduced magnetic force of a magnetic toner and to obtain a high-quality image by incorporating a specified amt. of powder of an iron oxide type magnetic material having a specified average particles size. CONSTITUTION:When a magnetic toner contg. a binding resin and powder of a magnetic material is produced, one or more kinds of iron oxide type magnetic materials such as Fe3O4 and Fe2O3 are used as the magnetic material. Fe3O4 is desirably used from the viewpoint of magnetic characteristics and hue. The average particle size of the powder is regulated to 0.03-0.1mum and the content to 10-45wt.%. Even in the case where the magnetic force and particle size of the magnetic toner are reduced, the formation of nonmagnetic particles or weakly magnetic particles is prevented and a high-quality image free from ground fog can be obtd.

113. 发明专利

JPH0279055A ELECTROSTATIC CHARGE IMAGE DEVELOPING METHOD 失效
公开(公告)号：JPH0279055A
公开(公告)日：1990-03-19
申请号：JP23111288
申请日：1988-09-14
申请人： HITACHI METALS LTD
发明人： ASANAE MASUMI
IPC分类号： G03G13/09 , G03G15/09
摘要： PURPOSE:To obtain an image of high density and high resolution without inducing any ground fogging by carrying out development by applying a low-frequency AC bias voltage to magnetic toner formed by mixing magnetic toner having the same polarity with magnetic carriers and magnetic toner having the opposite polarity at a specific ratio. CONSTITUTION:The magnetic toner 2 is used which is obtained by mixing 1-20wt.% magnetic toner with the same polarity with the magnetic carriers and 80-99wt.% magnetic toner having the opposite polarity. Then a permanent magnet roll 3 which has N and S magnetic polarities on the surface is provided at the bottom part of a toner tank 1 and a sleeve 4 is provided coaxially with the permanent magnet roll 3; and the both are provided relatively rotatably, a bias voltage source 6 is connected to the sleeve 4, and the low-frequency AC bias voltage is applied to the magnetic toner to perform the development. Consequently, the image of high density and high resolution is obtained without inducing any ground fogging.

114. 发明专利

JPH01116678A CLEANING DEVICE 失效
公开(公告)号：JPH01116678A
公开(公告)日：1989-05-09
申请号：JP27524387
申请日：1987-10-30
申请人： HITACHI METALS LTD
发明人： NOGUCHI KOJI , YAMASHITA KEITARO , ASANAE MASUMI , WADA MASAOKI
IPC分类号： G03G21/10 , G03G21/00
摘要： PURPOSE:To obtain a high-quality picture by connecting a freely rotatable fur brush and a recovering roll respectively with an a.c. bias voltage impressing means electrically and making the fur brush and the recovering roll into mutual opposite phases. CONSTITUTION:A fur brush 10 is formed to a cylindrical shape with a conductive material, the outer circumference of the brush 10 is brought into contact with the surface of a sensitive body 1 and provided freely rotatably through a rotation shaft composed of the conductive material, and a sleeve 12, in which a magnet roll 11 is built, is brought into contact and provided on the outer circumference. Thereafter, the a.c. bias voltage can be impressed to the rotation shaft 9 and the sleeve 12 mutually in opposite phase with a.c. bias voltage impressing means 14 and 15. Therefore, magnetites separated from a residual magnetic toner 2a of the sensitive body 1 and a magnetic toner are brought into contact with the fur brush 10, the positive and negative charges are removed, and when the magnetites reach a contacting place with the sleeve 12, the charges are completely removed by an opposite-phase a.c. bias voltage, and the magnetites are attracted on the surface of the sleeve 12. Thus, a high- quality picture without any base fogging can be obtained.

115. 发明专利

JPS6452168A REVERSAL DEVELOPMENT METHOD 失效
公开(公告)号：JPS6452168A
公开(公告)日：1989-02-28
申请号：JP20956687
申请日：1987-08-24
申请人： HITACHI METALS LTD
发明人： ASANAE MASUMI , KIMURA FUMIO
IPC分类号： G03G9/097 , G03G13/09 , G03G15/09
摘要： PURPOSE:To improve the fluidity and the carrying property of a toner in the titled method, by using an electric charge type magnetic toner which contains a metal salt of a fatty acid and adds externally a hydrophilic silica, for the titled method. CONSTITUTION:The electric charge type magnetic toner which contains the metal salt of the fatty acid and adds externally the hydrophilic silica is used for the titled method. In this case, the fatty acid part of the metal salt of the fatty acid contg. in the magnetic toner is exemplified by stearic acid or oleic acid, etc., and one or two or more kinds of a mixture thereof may be used. And, the metal salt of the fatty acid is exemplified by a cadmium salt or a barium salt thereof, etc., and one or two or more kinds of the mixture thereof may be used. And, the contact between a blade and a developing roll is remarkably smoothened by lying the magnetic toner contg. the metal salt of the fatty acid between the blade and said roll. And, the fluidity of the magnetic toner is improved by adding externally the hydrophilic silica to said toner, and especially, in case that a negative electric charge magnetic toner is used for the titled method, the electric charge amount of the magnetic toner increases, thereby improving the developing property of said toner.

116. 发明专利

JPS63136070A TRANSFER METHOD 失效
公开(公告)号：JPS63136070A
公开(公告)日：1988-06-08
申请号：JP28321786
申请日：1986-11-28
申请人： HITACHI METALS LTD
发明人： ASANAE MASUMI , GOTO TAKAHARU , KANEKAWA YOSUKE
IPC分类号： G03G15/16
摘要： PURPOSE:To obtain a copy image of good quality by applying a DC voltage to a corotron at low humidity and applying a DC pulse voltage to the corotron at high humidity. CONSTITUTION:The transfer corotron 7 is connected to a DC voltage source 11 and a pulse voltage power source 12 through a changeover switch 10, which is connected to a humidity sensor 14 through a control circuit 13. The control circuit 13 compares the output of the humidity sensor 14 with a reference value of humidity and changes contacts of the switch 10. Namely, the changeover switch 10 is switched to the DC voltage source 12 when the humidity is not high and to the pulse voltage source 13 at high humidity. Thus, the DC voltage is applied to the transfer corotron 7 at normal or low humidity and the DC pulse voltage to the transfer corotron 7 at high humidity, so that the resistance of a transfer sheet 6 does not decreases at the normal or low humidity. Consequently, an excellent copy is taken over a wide environmental condition range.

117. 发明专利

JPS6394255A IMAGE FORMING METHOD 失效
公开(公告)号：JPS6394255A
公开(公告)日：1988-04-25
申请号：JP24039686
申请日：1986-10-09
申请人： HITACHI METALS LTD
发明人： ASANAE MASUMI , NOGUCHI KOJI
IPC分类号： G03G15/05 , G03G9/08 , G03G9/083 , G03G15/00
摘要： PURPOSE:To improve resolution and to prolong the life of a developer by constituting a developer of magnetic grains containing iron oxide having 0.2-20mum average grain size. CONSTITUTION:The developer carried through the magnetic force of a magnetic field generating means is uniformly stuck to the surface of a dielectric belt 1 formed so as to be freely endlessly rotated by a bias voltage, an electrostatic charging pattern corresponding to an image signal is impressed to the developer through a multistylus head 6 to selectively electrify the developer, and then a non-charged developer is removed through another magnetic field generating means. In the procedure, the developer is constituted of magnetic grains containing iron oxide having 0.2-20mum average grain size. Consequently, the resolution of an image formed on an image carrier can be sharply improved and the life of the developer can be remarkably prolonged.

118. 发明专利

JPS6385758A DEVELOPER FOR ELECTROSTATIC DEVELOPMENT 失效
公开(公告)号：JPS6385758A
公开(公告)日：1988-04-16
申请号：JP23277386
申请日：1986-09-30
申请人： HITACHI METALS LTD
发明人： ASANAE MASUMI
IPC分类号： G03G9/10
摘要： PURPOSE:To improve developability by forming a carrier of a carrier mixture composed of a carrier having 30-200mum average grain size and fine powder carrier having 1-10mum average grain size. CONSTITUTION:The carrier of a developer for electrostatic development prepd. by mixing a toner contg. a resin, coloring agent and charge controlling agent and the carrier consisting of a magnetic material is formed of the carrier mixture composed of the carrier having 30-200mum average grain size and the fine powder carrier having 1-10mum average grain size. The toner is preferably nonmagnetic and the content of the fine powder carrier 3-5wt%; 10-70wt% magnetic powder is preferably incorporated into the toner and the content of the fine powder carrier is 5-20wt%. The electric charge quantity of the toner is thereby increased and the developability is eventually improved.

119. 发明专利

JPS6361266A FLASH FIXING TYPE MAGNETIC TONER FOR DEVELOPING MAGNETIC LATENT IMAGE 失效
公开(公告)号：JPS6361266A
公开(公告)日：1988-03-17
申请号：JP20564286
申请日：1986-09-01
申请人： HITACHI METALS LTD
发明人： ASANAE MASUMI , KIMURA FUMIO
IPC分类号： G03G9/08 , G03G19/00
摘要： PURPOSE:To decrease the staining of a magnetic head and to obtain a high- density image by sticking a PE resin having mol.wt. in a specific range to the surface of toner particles contg. a thermoplastic resin and magnetic powder. CONSTITUTION:This magnetic toner is used for obtaining the final image by developing a magnetic latent image, then transferring the image and subjecting the image to flash fixing. The toner is formed by sticking the PE resin having the mol.wt. ranging 1,500-12,000 to the surface of the toner particles contg. the thermoplastic resin and the magnetic powder. The toner adheres transiently to the magnetic head when the magnetic latent image is developed by using the magnetic toner stuck with the PE resin on the surface, but the PE has the property to solidify and shrink on cooling; therefore, the PE peels easily from the magnetic head and does not longer adhere to the magnetic head. The PE is too soft and the toner is liable to flocculate if the mol.wt. of the PE resin is below 1,500. The PE is hard and is difficult to fix if the mol.wt. exceeds 12,000.

120. 发明专利

JPS62175766A METHOD FOR DEVELOPING ELECTROSTATIC CHARGING IMAGE 失效
公开(公告)号：JPS62175766A
公开(公告)日：1987-08-01
申请号：JP1731786
申请日：1986-01-29
申请人： HITACHI METALS LTD , FUJITSU LTD
发明人： ASANAE MASUMI , KUMAKURA TOSHIO , IWAWAKI MASASHIRO
IPC分类号： G03G9/10 , G03G9/08 , G03G9/083 , G03G9/107 , G03G13/09
摘要： PURPOSE:To obtain the image with high quality and having a less tendency for falling the image density by supplying a ferrite carrier and a magnetic toner in a prescribed mixing ratio to a developing agent periodically. CONSTITUTION:When the electrostatic charging image formed on a selenium drum is developed using the developing agent composed of a mixture of the ferrite carrier and the magnetic toner by means of a magnetic brushing method. The ferrite carrier has 2-7X10 OMEGA.cm of volume resistivity and 74-149mum of a particle size distribution. The magnetic toner contains a polyester resin and 60wt% of the magnetic powder having saturation magnetization of 80-85emu/g. The ferrite and magnetic toner mixture having the compounding ratio of (1/28)-(1/24) is supplied to the developing agent periodically. As a fixing resin, polyester resin is necessary to use from view points of the fixing and the offset resisting properties. The non-linear polyester resin which is formed by one or more kinds of polyols and one or more kinds of polycarboxylic acid is more preferable.

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