Abstract: An image forming apparatus includes a rotational conveying unit for conveying a recording medium by rotating about a rotational axis. A head unit includes n nozzle rows in a conveying direction perpendicular to an axial direction parallel to the rotational axis. Each of the n nozzle rows includes nozzles aligned as a nozzle row in the axial direction. Each n nozzle row is arranged at a distance of d1 to d(n?1) from a predetermined reference nozzle row. A circuit outputs a rotational amount detection signal, and a conveying amount detection signal, and generates a discharge synchronization signal based on the detected rotational amount detection signal and the detected conveying amount detection signal, then generates a nozzle row timing signal based on the distance of the d1 to d(n?1) and the discharge synchronization signal, and generates discharge data based on the discharge synchronization signal and the nozzle row timing signal.

Abstract: An image forming apparatus includes a rotational conveying unit for conveying a recording medium by rotating about a rotational axis. A head unit includes n nozzle rows in a conveying direction perpendicular to an axial direction parallel to the rotational axis. Each of the n nozzle rows includes nozzles aligned as a nozzle row in the axial direction. Each n nozzle row is arranged at a distance of d1 to d(n?1) from a predetermined reference nozzle row. A circuit outputs a rotational amount detection signal, and a conveying amount detection signal, and generates a discharge synchronization signal based on the detected rotational amount detection signal and the detected conveying amount detection signal, then generates a nozzle row timing signal based on the distance of the d1 to d(n?1) and the discharge synchronization signal, and generates discharge data based on the discharge synchronization signal and the nozzle row timing signal.

Abstract: An image forming apparatus includes a rotating body to form an image, a sensor to detect a home position of the rotating body, a processor to acquire image density data of the image formed by the rotating body in odd-numbered rotation and even-numbered rotation of the rotating body separately based on a rotation home position signal output by the sensor, extract an image density fluctuation caused by a rotation of the rotating body, and correct an image forming condition based on the image density fluctuation.

Abstract: An image processing device includes an external memory interface to write image data to an image memory, and an inclination correction circuit. The inclination correction circuit generates coordinate information based on inclination information, detects, from the coordinate information, a minimum sub-scanning coordinate in each of divided areas of the image data, generates first read addresses for reading the divided areas of the image data from the image memory based on the minimum sub-scanning coordinate, reads the divided areas of the image data from the image memory based on the first read addresses, writes the divided areas of the image data to an internal memory, generates second read addresses for reading the divided areas of the image data from the internal memory based on the coordinate information, and reads the divided areas of the image data from the internal memory based on the second read addresses.

Abstract: An image forming apparatus includes a rotating body to form an image, a sensor to detect a home position of the rotating body, a processor to acquire image density data of the image formed by the rotating body in odd-numbered rotation and even-numbered rotation of the rotating body separately based on a rotation home position signal output by the sensor, extract an image density fluctuation caused by a rotation of the rotating body, and correct an image forming condition based on the image density fluctuation.

Abstract: An image processing device includes a writing circuit to write image data to a first memory, a second memory with a capacity of lines, a coordinate generating circuit to generate coordinate information based on inclination information, a deviation calculating circuit to calculate a maximum deviation amount of the image data from the coordinate information, a division number calculating circuit to calculate a division number based on the number of the lines and the deviation amount, an address generating circuit to generate an address for reading each of divided areas of the image data from the first memory, a burst length calculating circuit to calculate a burst length based on the division number and a main scanning width of the image data, and a transferring circuit to read and burst-transfer the image data from the first memory to the second memory based on the address and the burst length.

Abstract: An image processing device includes a writing circuit to write image data to an image memory and detect a write line number, a coordinate generating circuit to generate coordinate information based on inclination information, detect a minimum sub-scanning coordinate in each of divided areas of the image data, and generate first read addresses for reading the divided areas from the image memory, a reading circuit to read the divided areas from the image memory and detect a read line number, a reading control circuit to bring the reading circuit into a standby state and cancel the standby state, and a memory control circuit to generate write addresses for writing the divided areas to a memory, sequentially write the read divided areas to the memory, generate second read addresses for reading the divided areas from the memory, and sequentially read the divided areas from the memory.

Abstract: A light-source-driving control device thins a pixel at an edge portion of image data by a first pixel width; sets a second pixel width at the edge portion such that a ratio between the first and second pixel widths is constant; creates light amount information including a first light amount with which a pixel not included in the set second pixel width is exposed, and a second light amount with which a pixel included in the second pixel width is exposed; selects the first or second light amount based on a power-modulation control signal; drives light sources according to the selected light amount and a light-source-modulation pulse signal; and counts an addition value of pixel density considering a pixel width and a light amount, based on a data-width setting signal based on the second pixel width, and on a light-amount setting signal based on the light amount information.

Abstract: An image processing device includes a writing circuit to write image data to a first memory, a second memory with a capacity of lines, a coordinate generating circuit to generate coordinate information based on inclination information, a deviation calculating circuit to calculate a maximum deviation amount of the image data from the coordinate information, a division number calculating circuit to calculate a division number based on the number of the lines and the deviation amount, an address generating circuit to generate an address for reading each of divided areas of the image data from the first memory, a burst length calculating circuit to calculate a burst length based on the division number and a main scanning width of the image data, and a transferring circuit to read and burst-transfer the image data from the first memory to the second memory based on the address and the burst length.

Abstract: An image processing device includes an external memory interface to write image data to an image memory, and an inclination correction circuit. The inclination correction circuit generates coordinate information based on inclination information, detects, from the coordinate information, a minimum sub-scanning coordinate in each of divided areas of the image data, generates first read addresses for reading the divided areas of the image data from the image memory based on the minimum sub-scanning coordinate, reads the divided areas of the image data from the image memory based on the first read addresses, writes the divided areas of the image data to an internal memory, generates second read addresses for reading the divided areas of the image data from the internal memory based on the coordinate information, and reads the divided areas of the image data from the internal memory based on the second read addresses.

Abstract: An image processing device includes a writing circuit to write image data to an image memory and detect a write line number, a coordinate generating circuit to generate coordinate information based on inclination information, detect a minimum sub-scanning coordinate in each of divided areas of the image data, and generate first read addresses for reading the divided areas from the image memory, a reading circuit to read the divided areas from the image memory and detect a read line number, a reading control circuit to bring the reading circuit into a standby state and cancel the standby state, and a memory control circuit to generate write addresses for writing the divided areas to a memory, sequentially write the read divided areas to the memory, generate second read addresses for reading the divided areas from the memory, and sequentially read the divided areas from the memory.

Abstract: A light-source-driving control device thins a pixel at an edge portion of image data by a first pixel width; sets a second pixel width at the edge portion such that a ratio between the first and second pixel widths is constant; creates light amount information including a first light amount with which a pixel not included in the set second pixel width is exposed, and a second light amount with which a pixel included in the second pixel width is exposed; selects the first or second light amount based on a power-modulation control signal; drives light sources according to the selected light amount and a light-source-modulation pulse signal; and counts an addition value of pixel density considering a pixel width and a light amount, based on a data-width setting signal based on the second pixel width, and on a light-amount setting signal based on the light amount information.

Abstract: A liquid ejecting apparatus for ejecting liquid from an ejection head, the liquid being supplied from a liquid supplying source, the liquid ejecting apparatus comprising: a carriage having the ejection head including: a liquid channel configured for flowing the liquid from the liquid supplying source to the ejection head; a gas trap chamber which is formed in the midstream of the liquid channel and expands the width of the liquid channel; and a gas recovery chamber which is adjacent to the gas trap chamber and having a gas permeable wall between the gas recovery chamber and the gas trap chamber; a carriage driver which drives the carriage; an attachment/detachment connection which is detachably connected to the gas recovery chamber; and a depressurization unit which decreases a pressure of the gas recovery chamber to a pressure lower than that of the gas trap chamber via the attachment/detachment connection.

Abstract: A multi-beam laser light-intensity control circuit includes laser diodes; a light-receiving element for receiving a laser beam emitted from each laser diode and outputting a current corresponding to the light intensity of the received laser beam; and an automatic power control circuit for automatically controlling output power of each laser diode based on the current output from the light-receiving element.

Abstract: A semiconductor integrated circuit device controlling a first light amount of light emitted from a light source based on a second light amount of light entering a light amount detection part so that the first light amount becomes a target level is disclosed. The semiconductor integrated circuit device includes a comparison part configured to compare a voltage corresponding to the second light amount and a reference voltage corresponding to the target level; and a drive current control part configured to control a drive current supplied to the light source based on the result of the comparison by the comparison part. The drive current control part includes a return light identification part configured to determine whether the second light amount includes a third light amount of return light occurring discontinuously.

Abstract: A PLL control circuit, which outputs a PLL clock in response to a reference clock, is provided with a frequency adjustment circuit which performs frequency adjustment such that the PLL clock frequency is substantially constant even when the reference clock varies. The frequency adjustment circuit changes a set value in a counter, which determines the PLL clock frequency, in accordance with the variation in the reference clock frequency.

Abstract: A multi-beam laser light-intensity control circuit includes laser diodes; a light-receiving element for receiving a laser beam emitted from each laser diode and outputting a current corresponding to the light intensity of the received laser beam; and an automatic power control circuit for automatically controlling output power of each laser diode based on the current output from the light-receiving element.

Abstract: A semiconductor integrated circuit device controlling a first light amount of light emitted from a light source based on a second light amount of light entering a light amount detection part so that the first light amount becomes a target level is disclosed. The semiconductor integrated circuit device includes a comparison part configured to compare a voltage corresponding to the second light amount and a reference voltage corresponding to the target level; and a drive current control part configured to control a drive current supplied to the light source based on the result of the comparison by the comparison part. The drive current control part includes a return light identification part configured to determine whether the second light amount includes a third light amount of return light occurring discontinuously.

Abstract: A PLL control circuit, which outputs a PLL clock in response to a reference clock, is provided with a frequency adjustment circuit which performs frequency adjustment such that the PLL clock frequency is substantially constant even when the reference clock varies. The frequency adjustment circuit changes a set value in a counter, which determines the PLL clock frequency, in accordance with the variation in the reference clock frequency.

Abstract: A high-performance gear pump that does not require highly accurate machining is disclosed. The gear pump includes a housing having an accommodation chamber. A drive gear and a driven gear are positioned in contact with an inner surface of the accommodation chamber. The drive shaft is loosely received by the shaft hole of the drive gear, and the driven shaft is loosely received by the shaft support formed in the housing and the cover.