Abstract: A control portion of an image forming apparatus controls an exposure unit and a developing unit to form misregistration inspecting toner images at both end portions and a center portion of a photoconductive drum and transfers the toner images to an intermediate transfer belt. Then, the control portion detects a misregistration amount of each toner image by misregistration detecting sensors to obtain position information in a main scanning direction per each phase position in which the scanning exposure has been performed on the image carrier. The control portion corrects detection results of the detecting sensors at the both end portions by removing an axial moving amount within a rotation cycle of the photoconductive drum on a basis of a detection result of the misregistration detecting sensor at the center portion.

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 temperature rise of a head due to a printing operation with a higher speed and a higher density is suppressed. To realize this, an inkjet printing head is provided in which a plurality of printing element substrates having an ejection opening array consisting of a plurality of ejection openings for ejecting ink are arranged on a support plate in a direction of the ejection opening array. The support plate includes therein a heat pipe and a flow path through which cooling liquid is flowed.

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: 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: 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: An ink jet recording head includes a flow passage for a liquid for cooling a recording element substrate. The flow passage is provided inside a support plate that supports the recording element substrate along a recording element array of the recording element substrate. The shortest distance between a recording element and the flow passage at the end of the support plate is larger than the shortest distance between a recording element and the flow passage in the middle of the support plate.

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: An ink jet recording head includes recording element substrates each including at least one nozzle array and heat generating resistors, a common liquid chamber having introducing and discharging ports, and a supporting member mounting the recording element substrates and in which a plurality of individual liquid chambers for supplying the ink to respective recording element substrates and a plurality of ink inlet ports for supplying the ink from the common liquid chamber to respective individual liquid chambers are formed. The individual liquid chambers are arranged in a direction of flow of the ink from the ink introducing port toward the discharging port. At least in a most upstream individual liquid chamber with respect to the direction, a center line of an associated inlet port with respect to the direction is located downstream of a center line of the upstream individual liquid chamber with respect to the direction.

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: There is provided an inkjet printing apparatus having a printhead equipped with printing element row that includes printing elements having a plurality of heat-producing resistance elements. The apparatus includes a temperature sensing unit which senses the temperature of the printhead, a temperature distribution storage unit in which a temperature distribution along the printing element row, a temperature gradient calculating unit which calculates the temperature gradient of the printing element row from the temperature of the printhead sensed by the temperature sensing units, a predicting unit which predicts the temperature of each printing element using the temperature gradient and the temperature distribution along the printing element row, and a control unit which applies discharge pulses, which are decided based upon the predicted temperature from the predicting unit, to each of the printing elements.

Abstract: An ink jet recording head includes a flow passage for a liquid for cooling a recording element substrate. The flow passage is provided inside a support plate that supports the recording element substrate along a recording element array of the recording element substrate. The shortest distance between a recording element and the flow passage at the end of the support plate is larger than the shortest distance between a recording element and the flow passage in the middle of the support plate.

Abstract: A temperature rise of a head due to a printing operation with a higher speed and a higher density is suppressed. To realize this, an inkjet printing head is provided in which a plurality of printing element substrates having an ejection opening array consisting of a plurality of ejection openings for ejecting ink are arranged on a support plate in a direction of the ejection opening array. The support plate includes therein a heat pipe and a flow path through which cooling liquid is flowed.

Abstract: An image recording apparatus (2000) is disclosed, which includes forming elements (2002) for forming an image, a memory (2006) indicating relative desirability of utilizing the forming elements (2002) for forming the image, and processing unit (2008) for computing image recording signals using input image signals (2012) and the stored data. The use of a particular forming element is thereby biased dependent upon the relative desirability data for the other forming elements and the corresponding input image signals for the other forming elements.

Abstract: An ink jet recording head is constituted by a plurality of recording element substrates each including at least one nozzle array having a plurality of nozzles for ejecting ink and heat generating resistors for ejecting the ink by thermal energy, a common liquid chamber having an introducing port for supplying the ink to the nozzles and a discharging port for discharging the introduced ink outside the ink jet recording head, and a supporting member on which the recording element substrates are mounted and in which a plurality of individual liquid chambers for supplying the ink to associated ones of the recording element substrates and a plurality of ink inlet ports for supplying the ink from the common liquid chamber to associated ones of the individual liquid chambers are formed. The individual liquid chambers are arranged in a direction of flow of the ink flowing from the ink introducing port toward the discharging port.

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: There is provided an inkjet printing apparatus having a printhead equipped with printing element row that includes printing elements having a plurality of heat-producing resistance elements. The apparatus includes a temperature sensing unit which senses the temperature of the printhead, a temperature distribution storage unit in which a temperature distribution along the printing element row, a temperature gradient calculating unit which calculates the temperature gradient of the printing element row from the temperature of the printhead sensed by the temperature sensing units, a predicting unit which predicts the temperature of each printing element using the temperature gradient and the temperature distribution along the printing element row, and a control unit which applies discharge pulses, which are decided based upon the predicted temperature from the predicting unit, to each of the printing elements.

Abstract: An image recording apparatus (2000) is disclosed, which comprises forming elements (2002) for forming an image, a memory (2006) indicating relative desirability of utilising the forming elements (2002) for forming the image, and processing means (2008) for computing image recording signals using input image signals (2012) and the stored data. The use of a particular forming element is thereby biased dependent upon the relative desirability data of other forming elements, the corresponding input signal for the particular forming element, and a term for the particular forming element.

Abstract: An image recording apparatus (2000) is disclosed, which comprises forming elements (2002) for forming an image, a memory (2006) indicating relative desirability of utilising the forming elements (2002) for forming the image, and processing means (2008) for computing image recording signals using input image signals (2012) and the stored data. The use of a particular forming element is thereby biased dependent upon the relative desirability data for the other forming elements and the corresponding input image signals for the other forming elements.