Abstract:
A scanner adapted to selectively discharge a charged photosensitive surface emits a plurality of light beams, with the plurality of light beams impinging on the charged photosensitive surface forming a composite light spot to discharge the charge thereon. The intensity of at least one of the plurality of light beams may be varied to adjust the position of the composite spot centroid on the charged photosensitive surface.
Abstract:
An image position detector includes a light emitting element to emit light to an image on an image carrier, a first light receiving element to receive a specular reflection of light from a surface of the image carrier and output a first light receiving signal, and a second light receiving element to receive a diffuse reflection of light from a surface of the image and output a second light receiving signal. The image position detector is configured to find the end position of the image according to a multiplied value obtained by multiplying values of the first and second light receiving signals by a constant coefficient.
Abstract:
An image forming apparatus includes a hyper print video controller (HPVC) to generate video data from input data, an engine controller to compensate for a dot offset of the video data and to output the dot offset-compensated video data, and a laser scanning unit to perform a print operation according to the dot offset compensated video data. Therefore, HPVC size is reduced so that chip size can be reduced. This reduction in size accordingly reduces power consumption, and enhances chip efficiency.
Abstract:
A printer for printing on a medium on an endless belt by printer heads includes: a generator generating printing data for each printer head; a detector detecting time-series data for the meandering of the medium; a generator generating correction data preventing disorder of a printed image due to the meandering; and a controller operating each printer head according to the correction and printing data, wherein the correction-data generator selects a specific difference between factors in the time when the time-series and predetermined time-series data are related and newly generates correction data corresponding to the selected factor, wherein a replacement section replaces a factor in the time corresponding to the specific factor of the reference time-series data with the specific factor, and the time-series-data detection section detects the time-series data when power is supplied to the printer.
Abstract:
A printer for printing on a medium on an endless belt by printer heads includes: a generator generating printing data for each printer head; a detector detecting time-series data for the meandering of the medium; a generator generating correction data preventing disorder of a printed image due to the meandering; and a controller operating each printer head according to the correction and printing data, wherein the correction-data generator selects a specific difference between factors in the time when the time-series and predetermined time-series data are related and newly generates correction data corresponding to the selected factor, wherein a replacement section replaces a factor in the time corresponding to the specific factor of the reference time-series data with the specific factor, and the time-series-data detection section detects the time-series data when power is supplied to the printer.
Abstract:
A method for achieving accurate page margins on a media and a duplex imaging apparatus thereof. The method comprises: detecting a leading edge position by an edge sensor and a first left-to-right position of the media by an alignment sensor in a first imaging path; imaging a first side of the media in a print zone of the duplex imaging apparatus; removing the media from the print zone and disposing the media in a second imaging path; detecting a leading edge position by the edge sensor and a second left-to-right position of the media by the alignment sensor; determining a carrier reset distance by calculating a difference between first and second left-to-right positions, and shifting a print image by a distance substantially equal to the carrier reset distance thereby achieving accurate page margins for imaging a second side of the media with the print image. In another embodiment, the first left-to-right position can be determined by feeding the media into a preset first left-to-right position.
Abstract:
An optical scanner includes a light source unit configured to emit light; an optical system configured to cause the light emitted from the light source unit to scan an object so as to form an image on the object; and a control unit configured to control the light source unit. The light source unit includes a plurality of light emitting units arranged in a sub scanning direction, and the control unit controls the light source unit to emit light at different positions on the object by using either n (n: positive integer) light emitting units or n+1 light emitting units selected from among the plurality of light emitting units, according to a positional shift amount of the image in the sub scanning direction.
Abstract:
According to one embodiment, a scanning system includes a first light source configured to emit a first light beam, a second light source configured to emit a second light beam, a first sensor configured to detect a position of at least one of the first and the second light beams with respect to a photoconductor, a second sensor configured to provide positional information of a transfer system, and a control system coupled with the first sensor and the second sensor and configured to select one of the first light source and the second light source to form a first scan line of a latent image on the photoconductor responsive to output of the first sensor and the second sensor.
Abstract:
According to one embodiment, a scanning system includes a first light source configured to emit a first light beam, a second light source configured to emit a second light beam, a first sensor configured to detect a position of at least one of the first and the second light beams with respect to a photoconductor, a second sensor configured to provide positional information of a transfer system, and a control system coupled with the first sensor and the second sensor and configured to select one of the first light source and the second light source to form a first scan line of a latent image on the photoconductor responsive to output of the first sensor and the second sensor.
Abstract:
A multibeam scanning optical apparatus having a light source, an optical deflector, a scanning optical system, a detection optical element, and a photodetector. A plurality of light beams modulated in accordance with information signals are emitted from the light source and lead to the optical deflector. The light beams deflected by the optical deflector are then focussed on a surface to be scanned, typically a photosensitive drum, by way of the scanning optical system having an f&thgr; characteristic. Part of the deflected light beams are lead to the photodetector by a way of the detection optical system in order to control the timing of the start of scanning so that the centers of the scanning areas of the plurality of light beams agree with each other on the surface to be scanned.