公开(公告)号：US10768562B2

公开(公告)日：2020-09-08

申请号：US16534426

申请日：2019-08-07

Applicant: KONICA MINOLTA, INC.

Inventor： Katsuhide Sakai ,  Yasuhiro Koide ,  Toshiaki Tanaka ,  Akihiro Hayashi

IPC: G03G15/00

Abstract: An image forming apparatus forms an image on a sheet, and includes: a rotator used to form the image; a motor that drives the rotator rotationally; a current measurer that measures motor current flowing through a current-carrying path including a winding of the motor, at measurement timing that is timing after the motor starts up; a torque acquirer that acquires a torque value of the motor based on a measured value of the motor current; and a corrector that performs correction for cancellation of an amount of error based on one or both of a variation in characteristic corresponding to motor speed of the motor and a variation in characteristic corresponding to the motor current at the measurement timing, at the acquisition of the torque value by the torque acquirer.

公开(公告)号：US09671711B2

公开(公告)日：2017-06-06

申请号：US14932434

申请日：2015-11-04

Applicant: Konica Minolta, Inc.

Inventor： Makoto Shimazoe ,  Akihiro Hayashi ,  Hiroyuki Yoshikawa ,  Toshikazu Higashi

IPC: G03G15/00 ,  G03G15/02 ,  G03G15/01

CPC classification number: G03G15/0266 ,  G03G15/0136 ,  G03G15/80

Abstract: An image forming apparatus includes: a plurality of image forming units forming an image in the corresponding color by electrophotographic system; a high-voltage power supply circuit capable of generating a bias voltage; and a control unit that controls a first printing mode and a second printing mode, wherein in the second printing mode, the control unit performs such control that the photosensitive bodies provided on the image forming units not used in the second printing mode continuously rotate at a speed lower than a speed in the first printing mode, and/or such control that a bias voltage whose absolute value is less than an absolute value of a bias voltage in the first printing mode is supplied from the high-voltage power supply circuit to the processing components of the same type provided on the image forming units not used in the second printing mode.