Canon Kabushiki Kaisha

Kota Kiyama

Masaaki Naoi

Tadashi Matsumoto

Takayuki Ninomiya

Shoji Kanemura

Noriyuki Chino

Toru Miyazawa

Yuichiro Suzuki

Yuri Mori

Haruhiko Tanami

Isao Iwai

Shuhei Hamada

Katsuhiko Takano

Junji Yasuda

Noboru Koumura

Yoshinobu Sekiguchi

Isao Hayashi

Seiji Hara

Masahiko Mizoguchi

Yuji Uramoto

An electric apparatus for controlling movement of a target object by performing first and second feedback controls, based on a detection signal obtained from detecting the movement of the target object, generates an operation quantity on the target object based on first and second operation quantities for the second feedback control if one of a predetermined target value and an estimated first state quantity of the target object is higher than a first threshold value, and generates the operation quantity on the target object using only the first operation quantity from among the first and the second operation quantities if one of the target value and the first state quantity of the target object is lower than the first threshold value.

Electric apparatus and control method therefor

An apparatus detects movement of a target object, estimates a control quantity for first feedback control for the target object at a first period based on a detection signal, estimates a first state quantity of the target object and a second state quantity obtained by time differentiation of the first state quantity for second feedback control for the target object at a second period, shorter than the first period, based on the detection signal, generates a first operation quantity for the first feedback control based on the control quantity, generates a second operation quantity for the second feedback control based on the first and second state quantities, determines a sign of the second operation quantity from a relationship between the first and second state quantities, and generates an operation quantity on the target object from the first and second operation quantities.

Electric apparatus and control method for controlling movement of target object

An apparatus for controlling movement of a target object generates a first operation quantity for first feedback control, and determines a second operation quantity for second feedback control in accordance with which of plural regions obtained by dividing a two-dimensional space defined by two variables of the first and second state quantities includes the first and second state quantities. The plural regions include first, second and third regions, the first region being provided between the second and third regions. The second operation quantity is determined so that the second operation quantity when the first and second state quantities are located in the first region is less than the second operation quantity when the first and second state quantities are located in the second region or the third region.

A position estimation unit of a motor control apparatus includes a counter electromotive voltage estimation unit configured to estimate a counter electromotive voltage generated in a motor based on generated voltage and current of the motor, and an arc tangent calculation unit configured to perform an arc tangent calculation using coordinate data on a two-dimensional plane based on the estimated counter electromotive voltage to calculate an angle of deviation. The arc tangent calculation unit includes a rotation calculation unit configured to repeatedly perform a rotation calculation of coordinate data on a fundamental wave and a harmonic; a rotation direction judgment unit configured to judge a rotation direction of a subsequent rotation calculation based on a result of the rotation calculation of the rotation calculation unit; and a deviation angle calculation unit configured to calculate a total of rotation angles obtained as a result of the rotation calculation.

Motor control apparatus and control method for motor control apparatus

A motor control apparatus includes: a unit configured to determine a counter-electromotive voltage in a winding of a motor; a unit configured to determine a rotational position of a rotor of the motor based on the counter-electromotive voltage; a unit configured to determine a first velocity of the rotor, based on change in the rotational position; a correction unit configured to obtain a second velocity by correcting the first velocity based on a harmonic component included in the first velocity; and a driving unit configured to drive the motor based on the second velocity and the rotational position. The correction unit includes a unit configured to obtain the second velocity by reducing error in the first velocity that occurs due to the harmonic component.

Motor control apparatus for controlling motor based on counter-electromotive voltage generated in winding of motor

A driving transmission device includes a motor, a first pulley, a second pulley, an endless belt which is wound on the first pulley and the second pulley, dielectric layers disposed between the endless belt and the first pulley and between the endless belt and the second pulley, and a power source unit. A length of a portion of the endless belt which is wound on the second pulley is longer than a length of a portion of the endless belt which is wound on the first pulley. An amount of current supplied from the second pulley to the endless belt in a region in which the endless belt is wound on the second pulley is smaller than an amount of current supplied from the first pulley to the endless belt in a region in which the endless belt is wound on the first pulley.

Driving transmission device and image forming apparatus

A driving transmission device includes a motor, a first pulley to be rotated by the motor, a second pulley connected to a rotating member, an endless belt wound on the first pulley and the second pulley, a dielectric layer provided between the endless belt and the first pulley and between the endless belt and the second pulley, and a power supply unit configured to apply a voltage to the first pulley. The first pulley, the endless belt, and the second pulley are connected in series. A length by which the endless belt is wound on the second pulley is larger than a length by which the endless belt is wound on the first pulley. A voltage applied to the second pulley is lower than the voltage applied to the first pulley.

A drive transmission device having motor, a first pulley configured to be driven to rotate by the motor, a second pulley configured to be connected to a device, and a belt unit configured to be wound around the first pulley and the second pulley. The belt unit includes a metal layer and a dielectric layer configured to be provided between the first pulley and the metal layer and between the second pulley and the metal layer. The drive transmission device also includes a voltage supply unit configured to supply voltage to cause attraction between the first and second pulleys and the belt and a controller configured to control the voltage of the voltage supply unit based on information indicating load of the device.

Drive transmission device and image forming apparatus

A secondary coil is attached to an end portion of a heating film. A space is formed inside a core member. A primary coil, which generates a magnetic field that causes the secondary coil to generate a current by electromagnetic induction, is arranged inside the space together with the secondary coil.

Fixing device for fixing toner on sheet by heating toner, and image forming apparatus including fixing device

A control portion controls a drive of rotation of an image carrier and registers a second index with a first index passing through a transfer position at real time at the time of image formation. Before starting the image formation, the toner image forming portion is controlled to adjust misalignment between the first index and the second index. Accordingly, the second index is formed at a position on the image carrier which is registered with the first index in advance, so that a large amount of control for compensating a large amount of phase misalignment is no longer necessary.

Image forming apparatus

A recording apparatus includes a recording unit configured to record images on a recording medium of a roll-type, the recording unit including a plurality of line-type recording heads, a first conveyance roller, located at an upstream side of the plurality of line-type recording heads, a second conveyance roller, located at a downstream side of the plurality of line-type recording heads, a first signal generation unit, including a laser doppler speed meter for detecting a surface of the recording medium being conveyed, a second signal generation unit, including a rotary encoder, a correction unit configured to correct the first signal when a period value of the first signal is outside a predetermined range, an information generation unit, and a control unit configured to control recording on the recording medium based on the variation information and the second signal so as to suppress adverse effects caused by the first conveyance roller.

Recording apparatus and method for controlling the recording apparatus

A light scanning apparatus including: a light source to emit a laser beam; a light source driving unit to turn on and off the light source according to image data and a pixel clock; a rotary polygon mirror to deflect the light beam; a motor to rotationally drive the rotary polygon mirror; and a control unit to control a rotary speed of the motor to generate an acceleration control signal for accelerating the rotary speed and a deceleration control signal for decelerating the rotary speed, wherein for the acceleration control signal, the driving unit corrects the frequency of the pixel clock to be higher than the frequency, which is before the acceleration control, and for the deceleration control signal, the driving unit corrects the frequency of the pixel clock to be lower than the frequency, which is before the deceleration control.

Light scanning apparatus and image forming apparatus

An optical scanning apparatus includes a light source which emits an optical beam, a deflection scanning unit, and a control unit. The deflection scanning unit includes a rotating polygonal mirror which deflection-scans the optical beam emitted from the light source so that the optical beam will scan an object to be scanned, and a drive unit which rotationally drives the rotating polygonal mirror. The control unit controls the rotational speed of the rotating polygonal mirror by accelerating or decelerating the drive unit at a predetermined time during one rotation of the rotating polygonal mirror. The predetermined time is a time when a deviation in length of a scanning line formed by each reflecting surface of the rotating polygonal mirror becomes relatively small.

Optical scanning apparatus

An optical scanning apparatus capable of properly correcting a main scanning scale factor. Upstream and downstream laser-light detection sensors of the optical scanning apparatus each generate a signal when first or second light beam passes through each of slits formed in the sensors. Based on signals, a scanning time required for each light beam to scan between the sensors is measured. A correction coefficient is decided by a correction value calculation unit based on a difference between wavelengths of the first and second light beams, a scanning time difference is calculated by a comparison unit based on the correction coefficient and scanning times of the light beams, and the downstream laser-light detection sensor is rotated by a sensor rotation drive unit to make the scanning time difference zero, whereby the slits are made parallel to each other.

Optical scanning apparatus and control method therefor

A recording apparatus that performs recording by ejecting ink onto a recording medium from a plurality of recording heads include a conveying roller that conveys the recording medium that is continuously fed; the plurality of recording heads arranged in the conveying direction of the conveying roller; a skew sensor that detects the amount of displacement of the position of the recording medium skewed in the widthwise direction perpendicular to the conveying direction relative to the recording heads when the recording medium is skewed with respect to the conveying direction; and an angle adjusting mechanism that rotates the recording heads relative to the recording medium on the basis of the amount of displacement detected by the skew sensor.

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Kawasaki, Japan

Kota Kiyama