公开(公告)号：US10372055B2

公开(公告)日：2019-08-06

申请号：US15833487

申请日：2017-12-06

申请人： Konica Minolta, Inc.

发明人： Hisashi Murata

IPC分类号： G03G15/02 ,  G03G21/20

摘要： An image forming apparatus includes a photoconductor, a charging member, a first power supply circuit which supplies electric power to the charging member, a detector configured to detect a current value of an alternating current which flows to the charging member, and a controller configured to control an operation of the first power supply circuit. The controller is configured to lower a frequency of alternating-current power supplied to the charging member by the first power supply circuit when the current value detected by the detector in application of a voltage of a prescribed value to the charging member by the first power supply circuit is equal to or smaller than a predetermined value.

公开(公告)号：US09846383B2

公开(公告)日：2017-12-19

申请号：US15377242

申请日：2016-12-13

申请人： Konica Minolta, Inc.

发明人： Hisashi Murata

IPC分类号： G03G15/02

CPC分类号： G03G15/0266

摘要： An image formation device in which an image carrier is charged by a charging member includes: a power source configured to supply a charge voltage to the charging member, the charge voltage being formed such that an AC voltage is superimposed on a DC voltage; a detection unit configured to detect an alternating current value flowing through the charging member; and a control unit configured to control a peak-to-peak voltage value of the AC voltage, wherein the control unit executes: first processing of sequentially supplying a plurality of charge voltages from the power source to the charging member in non-image formation; second processing of obtaining, from an alternating current value detection result, a third approximate function indicating a difference value between a first approximate function and a second approximate function; and third processing of determining one of different predetermined ranges and determining a peak-to-peak voltage value in image formation.

公开(公告)号：US09568851B2

公开(公告)日：2017-02-14

申请号：US15053253

申请日：2016-02-25

申请人： Konica Minolta, Inc.

发明人： Hisashi Murata ,  Kazuki Kobori ,  Hirohisa Shirai ,  Masato Kimura

IPC分类号： G03G15/02

CPC分类号： G03G15/0266 ,  G03G2215/0132 ,  G03G2215/021

摘要： An image forming apparatus that forms an image on a medium includes: an image carrying member; a charging unit disposed in proximity to the image carrying member; a power supply unit configured to sequentially apply a plurality of charging voltages to the charging unit when the medium is not fed through; a current detecting unit configured to detect an AC value flowing through the charging unit; a processing unit configured to perform first charging voltage determination control to derive a peak-to-peak voltage value to be used in a process; and a storage unit configured to pre-store a reference peak-to-peak voltage value for each wastage level of the image carrying member, wherein the processing unit: prohibits execution of the first charging voltage determination control and performs second charging voltage determination control; and obtains a reference peak-to-peak voltage value and derives a peak-to-peak voltage value to be used in the process.

摘要翻译： 在介质上形成图像的图像形成装置包括：图像承载部件; 设置在图像承载构件附近的充电单元; 电源单元，被配置为当所述介质不被馈送时，向所述充电单元顺序地施加多个充电电压; 电流检测单元，被配置为检测流过所述充电单元的AC值; 处理单元，被配置为执行第一充电电压确定控制以导出在过程中要使用的峰 - 峰值电压值; 以及存储单元，被配置为对所述图像承载构件的每个浪费水平预先存储参考峰 - 峰值电压值，其中所述处理单元：禁止执行所述第一充电电压确定控制并执行第二充电电压确定控制; 并获得参考峰 - 峰值电压值，并导出在该过程中要使用的峰 - 峰电压值。

公开(公告)号：US09665030B2

公开(公告)日：2017-05-30

申请号：US15050023

申请日：2016-02-22

申请人： KONICA MINOLTA, INC.

发明人： Tomohiro Kato ,  Kazuki Kobori ,  Hirohisa Shirai ,  Hisashi Murata ,  Masato Kimura

IPC分类号： G03G15/02 ,  G03G21/20

CPC分类号： G03G15/0266 ,  G03G21/20 ,  G03G2215/00772 ,  G03G2215/00776

摘要： An image forming apparatus has: an image supporting member, a charger, a power source unit, an amperometric detector, and a processor. The power source unit applies a plurality of charging voltages, which includes alternating voltages respectively, to the charger sequentially while no print medium is fed. The alternating voltages have different peak-to-peak voltages for a forward discharge range and different peak-to-peak voltages for a reverse discharge range, respectively. The amperometric detector detects values of alternating current flowing in the charger during application of the charging voltages. The processor derives characteristic lines of alternating current value with respect to alternating voltage for the forward discharge range and for the reverse discharge range, respectively, from the values detected by the amperometric detector. The processor derives a peak-to-peak voltage to be used in a process in a different way depending on a difference in slope between the characteristic lines.

公开(公告)号：US09482981B2

公开(公告)日：2016-11-01

申请号：US15049423

申请日：2016-02-22

申请人： KONICA MINOLTA, INC.

发明人： Tomohiro Kato ,  Kazuki Kobori ,  Hirohisa Shirai ,  Hisashi Murata ,  Masato Kimura

IPC分类号： G03G15/02 ,  G03G21/20

CPC分类号： G03G15/0266 ,  G03G21/20 ,  G03G2215/00772 ,  G03G2215/00776 ,  G03G2215/0132

摘要： An image forming apparatus has: an image supporting member; a charger in proximity to the image supporting member; a power source unit configured to apply charging voltages to the charger sequentially, the charging voltages including alternating voltages having different peak-to-peak voltages, respectively; an amperometric detector configured to detect values of alternating currents flowing in the charger during application of the charging voltages; and a processor configured to carry out a first charging voltage determination process or a second charging voltage determination process requiring a shorter time than the first charging voltage determination process selectively based on a detection result of the amperometric detector. The processor carries out the first charging voltage determination process or the second charging voltage determination process selectively in accordance with a difference between an ambient temperature at a previous time of carrying out the first charging voltage determination process and a current ambient temperature.

摘要翻译： 图像形成装置具有：图像支撑部件; 靠近图像支撑构件的充电器; 电源单元，被配置为向充电器依次施加充电电压，所述充电电压分别包括具有不同峰 - 峰值电压的交流电压; 安培计检测器，被配置为在施加充电电压期间检测在充电器中流动的交流电流的值; 以及处理器，被配置为基于电流检测器的检测结果，选择性地执行需要比第一充电电压确定处理更短的时间的第一充电电压确定处理或第二充电电压确定处理。 处理器根据执行第一充电电压确定过程的先前时间的环境温度与当前环境温度之间的差异选择性地执行第一充电电压确定处理或第二充电电压确定处理。