Abstract: In conventional image reading in a large-sized scanner using plural CIS sensors, overall linearity of an original is poor, and a shift occurs particularly at connection portions of the CIS sensors in the read image. To solve this, an image reading apparatus in which CISs are arranged zigzag, and an original is read while conveying the original by a conveyance roller in a direction different from an arrayed direction of the reading elements of the CIS sensors performs following correction. That is, a shift from an image position in a calibration sheet corresponding to a rotation angle of the conveyance roller for at each position of the CIS sensors is detected from image data obtained by reading the calibration sheet while conveying the calibration sheet by the conveyance roller. The shift is corrected.

Abstract: In conventional image reading in a large-sized scanner using plural CIS sensors, overall linearity of an original is poor, and a shift occurs particularly at connection portions of the CIS sensors in the read image. To solve this, an image reading apparatus in which CISs are arranged zigzag, and an original is read while conveying the original by a conveyance roller in a direction different from an arrayed direction of the reading elements of the CIS sensors performs following correction. That is, a shift from an image position in a calibration sheet corresponding to a rotation angle of the conveyance roller for at each position of the CIS sensors is detected from image data obtained by reading the calibration sheet while conveying the calibration sheet by the conveyance roller. The shift is corrected.

Abstract: An apparatus includes a driven member, a DC brushless motor, a first signal generation unit configured to output a first signal according to rotation of the DC brushless motor and to change an output value of the first signal each time the DC brushless motor rotates by a predetermined amount, a movement unit configured to move the driven member by a driving force of the DC brushless motor, a second signal generation unit configured to output a second signal each time the driven member moves by the predetermined amount, and a control unit configured to control driving of the DC brushless motor based on the output value of the first signal and a value of a number of times that the second signal is output during a period in which the DC brushless motor rotates by a predetermined amount.

Abstract: The operation accuracy of a printing unit is improved in a printing apparatus. To accomplish this, a motor driving apparatus includes a brushless motor having coils of a plurality of phases, and a plurality of detection units that output voltages in accordance with rotation of a rotor, a driving unit that drives the brushless motor by switching a current supply destination between the coils of the plurality of phases based on a control signal, and a generation unit that generates the control signal based on addition results of detection signals output from the plurality of detection units, and correction signals based on differences between a predetermined voltage corresponding to a rotation angle of the rotor and voltages corresponding to the rotation angle of the rotor that are obtained from the plurality of detection units.

Abstract: The operation accuracy of a printing unit is improved in a printing apparatus. To accomplish this, a motor driving apparatus comprise a brushless motor including coils of a plurality of phases, and a plurality of detection units that output voltages in accordance with rotation of a rotor, a driving unit that drives the brushless motor by switching a current supply destination between the coils of the plurality of phases based on a control signal, and a generation unit that generates the control signal based on addition results of detection signals output from the plurality of detection units, and correction signals based on differences between a predetermined voltage corresponding to a rotation angle of the rotor and voltages corresponding to the rotation angle of the rotor that are obtained from the plurality of detection units.

Abstract: There is provided an apparatus capable of obtaining an image with good quality even if platen suction pressure for reducing sheet floatation is different. The apparatus includes a conveyance unit configured to convey a recording medium, a platen configured to hold the recording medium at a position facing the recording head, a generation unit configured to generate power to attract the recording medium on the platen, and a control unit configured to correct a drive amount of the conveyance unit based on the generated power.

Abstract: An apparatus includes a driven member, a DC brushless motor, a first signal generation unit configured to output a first signal according to rotation of the DC brushless motor and to change an output value of the first signal each time the DC brushless motor rotates by a predetermined amount, a movement unit configured to move the driven member by a driving force of the DC brushless motor, a second signal generation unit configured to output a second signal each time the driven member moves by the predetermined amount, and a control unit configured to control driving of the DC brushless motor based on the output value of the first signal and a value of a number of times that the second signal is output during a period in which the DC brushless motor rotates by a predetermined amount.

Abstract: There is provided an apparatus capable of obtaining an image with good quality even if platen suction pressure for reducing sheet floatation is different. The apparatus includes a conveyance unit configured to convey a recording medium, a platen configured to hold the recording medium at a position facing the recording head, a generation unit configured to generate power to attract the recording medium on the platen, and a control unit configured to correct a drive amount of the conveyance unit based on the generated power.

Abstract: A rotor portion, which is supported rotatably with respect to a housing, rotates due to magnetic action with a magnet attached to the rotor portion by flowing electric current through an electromagnetic coil. Vibration of the rotor portion becomes large if centrifugal force is generated due to eccentricity or unbalance. Positional sensors detect the deviations. In order to eliminate the deviations, electric current flows through an electromagnetic coil, causing a force in a radial direction to act on the rotor portion. A bearing device capable of correcting minute shaft deviations is thus obtained.

Abstract: A rotor portion, which is supported rotatably with respect to a housing, rotates due to magnetic action with a magnet attached to the rotor portion by flowing electric current through an electromagnetic coil. Vibration of the rotor portion becomes large if centrifugal force is generated due to eccentricity or unbalance. Positional sensors detect the deviations. In order to eliminate the deviations, electric current flows through an electromagnetic coil, causing a force in a radial direction to act on the rotor portion. A bearing device capable of correcting minute shaft deviations is thus obtained.