Abstract: An image forming apparatus with an image reading apparatus that may suppress the intensity level of radiated noise from the image reading apparatus in an appropriate manner, without disrupting other functions, etc. The movable image reading apparatus comprises a carriage having a light source adapted to expose an original to light, a photoelectric conversion element, and a drive circuit unit adapted to drive the photoelectric conversion element; and a plurality of guide members adapted to movably guide the carriage. The plurality of guide members are individually earthed to a housing of the image forming apparatus through a plurality of earth contacts.

Abstract: An image forming apparatus is operable in a first mode where a toner images on one of a plurality of image bearing members are transferred to an intermediate transfer belt; and in a second mode where toner images on the image bearing members are superimposedly transferred to toner images on the intermediate transfer member. A bias controlling unit controls the bias of the intermediate transfer belt by rotating the intermediate transfer belt until the toner images on the image bearing members are transferred to the intermediate transfer belt after the image bearing members have contacted with or separated from the intermediate transfer belt. A duration when the intermediate transfer belt is rotated when the second mode is changed to the first mode is shorter than a duration when the intermediate transfer belt is rotated when the first mode is changed to the second mode.

Abstract: A fixing apparatus has a first heating member and a second heating member provided in a heating portion, and a current control unit which controls an AC current to be supplied to the heating portion, The current control unit executes a wave number control, on the AC current supplied to the heating portion, in a unit of predetermined number of half-waves so that an AC current to the first heating member is supplied in a positive-negative symmetrical pattern in the unit of predetermined number of half-waves; an AC current to the second heating member is supplied in a positive-negative symmetrical pattern in the unit of predetermined number of half waves; AC currents to the first and second heating members are supplied in a positive-negative symmetrical pattern in total in the unit of predetermined number of half-waves and the current control unit increases the duty ratio alternately for the first heating member and the second heating member.

Abstract: A fixing apparatus has a first heating member and a second heating member provided in a heating portion, and a current control unit which controls an AC current to be supplied to the heating portion. The current control unit executes a wave number control, on the AC current supplied to the heating portion, in a unit of predetermined number of half-waves so that an AC current to the first heating member is supplied in a positive-negative symmetrical pattern in the unit of predetermined number of half-waves; an AC current to the second heating member is supplied in a positive-negative symmetrical pattern in the unit of predetermined number of half-waves; AC currents to the first and second heating members are supplied in a positive-negative symmetrical pattern in total in the unit of predetermined number of half-waves and the current control unit increases the duty ratio alternately for the first heating member and the second heating member.

Abstract: An image forming apparatus is operable in a first mode where a toner images on one of a plurality of image bearing members are transferred to an intermediate transfer belt; and in a second mode where toner images on the image bearing members are superimposedly transferred to toner images on the intermediate transfer member. A bias controlling unit controls the bias of the intermediate transfer belt by rotating the intermediate transfer belt until the toner images on the image bearing members are transferred to the intermediate transfer belt after the image bearing members have contacted with or separated from the intermediate transfer belt. A duration when the intermediate transfer belt is rotated when the second mode is changed to the first mode is shorter than a duration when the intermediate transfer belt is rotated when the first mode is changed to the second mode.

Abstract: A motor drive control apparatus which are capable of improving quietness during operation of a motor without the need of modifying the motor driving circuit and without increasing the load torque on the motor. The motor drive control apparatus is connected to a pulse motor via a driving gear disposed on an output side of the motor, and a driven gear engaging the driving gear. The motor drive control apparatus performs drive control in which the motor is driven to transmit a driving force of the motor to a load via the driving gear and the driven gear, and performs position control in which the driving gear is moved by a predetermined amount such that a gap formed between the driving gear and the driven gear is reduced or removed, before the drive control is performed. The drive control is performed when a predetermined period of time has elapsed after the position control is performed.

Abstract: The invention provides a fixing apparatus fixing apparatus having a heating portion for heat fixing an unfixed developer borne on a recording material, including: a first heating member and a second heating member provided in the heating portion; and a current control unit which controls an AC current to be supplied to the heating portion; wherein the current control unit executes a wave number control, on the AC current supplied to the heating portion, in a unit of N half-waves in such a manner that: an AC current to the first heating member is supplied in a positive-negative symmetrical pattern in the unit of N half-waves; an AC current to the second heating member is supplied in a positive-negative symmetrical pattern in the unit of N half-waves; and AC currents to the first and second heating members are supplied in a positive-negative symmetrical pattern in total in the unit of N half-waves.