Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: An image forming apparatus capable of enhancing the accuracy of the scanning position of a laser beam to thereby obtain a more precise image. Optical sensors detect reflected light from a surface of a photosensitive drum. During image formation, the apparatus detects the scanning speed of the laser beam in a main scanning direction based on detection signals from the respective optical sensors in each of divisional sections of an image forming area in the main scanning direction. The apparatus corrects magnification of the image in the main scanning direction, based on results of detection of the scanning speed of the laser beam in the main scanning direction.

Abstract: In an ink jet printing apparatus using a plurality of printing heads arranged in a convey direction of a printing medium, an inclination angle of the printing medium to a predetermined convey direction is detected to adjust, in accordance with the resultant inclination angle, timings at which ink is jetted from the plurality of printing heads. This allows, even when the printing medium being subjected to a printing operation has a slight meander shape, an image to be formed on a printing medium so that printing positions of the plurality of printing heads have no dislocation.

Abstract: A method for controlling a printing position for a printing apparatus for using a plurality of printing heads to print an image is provided. This method prevents, even when a conveyed print medium has deformation such as deflection, a printing position of a print medium from being dislocated. To realize this, components 11 to 14 for detecting the conveyance speed of a print medium and components 101 to 107 adjusting the driving timing at which the respective plurality of printing heads eject ink in accordance with the resultant conveyance speed are provided. As a result, even when a conveyed print medium has deformation such as deflection, the control can be provided that prevents the print medium from having a dislocated printing position.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A recording apparatus includes a recording unit configured to record an image on a recording medium, a roller configured to convey the recording medium, a first signal generation unit configured to generate a first period signal according to a movement of the recording medium, a second signal generation unit configured to generate a second period signal according to a rotation of the roller, a correction unit configured to correct the first period signal when a period value of the first period signal is outside a predetermined range, an information generation unit configured to generate variation information of a moving speed of the recording medium based on the first period signal, and a control unit configured to control recording on the recording medium based on the variation information and the second period signal.

Abstract: An image forming apparatus capable of enhancing the accuracy of the scanning position of a laser beam to thereby obtain a more precise image. Optical sensors detect reflected light from a surface of a photosensitive drum. During image formation, the apparatus detects the scanning speed of the laser beam in a main scanning direction based on detection signals from the respective optical sensors in each of divisional sections of an image forming area in the main scanning direction. The apparatus corrects magnification of the image in the main scanning direction, based on results of detection of the scanning speed of the laser beam in the main scanning direction.

Abstract: A method for controlling a printing position for a printing apparatus for using a plurality of printing heads to print an image is provided. This method prevents, even when a conveyed print medium has deformation such as deflection, a printing position of a print medium from being dislocated. To realize this, components 11 to 14 for detecting the conveyance speed of a print medium and components 101 to 107 adjusting the driving timing at which the respective plurality of printing heads eject ink in accordance with the resultant conveyance speed are provided. As a result, even when a conveyed print medium has deformation such as deflection, the control can be provided that prevents the print medium from having a dislocated printing position.

Abstract: A method for controlling a printing position for a printing apparatus for using a plurality of printing heads to print an image is provided. This method prevents, even when a conveyed print medium has deformation such as deflection, a printing position of a print medium from being dislocated. To realize this, components 11 to 14 for detecting the conveyance speed of a print medium and components 101 to 107 adjusting the driving timing at which the respective plurality of printing heads eject ink in accordance with the resultant conveyance speed are provided. As a result, even when a conveyed print medium has deformation such as deflection, the control can be provided that prevents the print medium from having a dislocated printing position.

Abstract: In an ink jet printing apparatus using a plurality of printing heads arranged in a convey direction of a printing medium, an inclination angle of the printing medium to a predetermined convey direction is detected to adjust, in accordance with the resultant inclination angle, timings at which ink is jetted from the plurality of printing heads. This allows, even when the printing medium being subjected to a printing operation has a slight meander shape, an image to be formed on a printing medium so that printing positions of the plurality of printing heads have no dislocation.

Abstract: In an ink jet printing apparatus using a plurality of printing heads arranged in a convey direction of a printing medium, an inclination angle of the printing medium to a predetermined convey direction is detected to adjust, in accordance with the resultant inclination angle, timings at which ink is jetted from the plurality of printing heads. This allows, even when the printing medium being subjected to a printing operation has a slight meander shape, an image to be formed on a printing medium so that printing positions of the plurality of printing heads have no dislocation.

Abstract: 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.