Abstract:
The invention concerns a clock-generating circuit, which generates dot clock pulses for driving a light-emitting element employed in an optical-writing section of an image-forming apparatus and has a function of canceling f&thgr; property errors caused by a f&thgr; lens employed in the image-forming apparatus. The clock-generating circuit includes a digital-delay dot clock adjusting section to adjust timings of rising-edges or falling-edges of the dot clock pulses generated by changing a selection for a plurality of delayed-clock pulses, which are generated by delaying clock-pulses, outputted from a reference oscillator, in slightly different delay times; and a controlling section to control a selecting operation for the plurality of delayed clock pulses, performed in the digital-delay dot clock adjusting section, so as to compensate for f&thgr; property errors caused by the f&thgr; lens employed in the optical-writing section.
Abstract:
The multicolor image forming apparatus according to the present invention comprises openings near the edge of the laser beam scanning start side, near the center, and near the edge of the laser beam scanning end side, on the photoconductor belt. The multicolor image forming apparatus measures time intervals from the horizontal synchronizing signal to the detection of the scanning start-side opening, the center opening, and the scanning end-side opening, respectively. The multicolor image forming apparatus calculates the function indicating the scanning speed at time t along the surface of the photoconductor, to correct the function indicating an image clock frequency at time t.
Abstract:
A central time-shared data processing system organized for character analysis and coupled to a number of remote document scanning stations each including a drum document feed, the drum being rotatable in small incremental steps, and means operable between steps for scanning the document along a path parallel to a line of characters on the document to produce data identifying graphic figures for analysis by the central processing system.
Abstract:
A facsimile device is provided which sends data signals onto a transmission line at a constant speed even though the scanning speed is varied along the scanning line. Video signals derived by scanning the subject copy are sampled, and the sampled data signals derived from each scanning are stored alternately into one of two buffer shift registers. While one of the two registers is storing the data signals, the other register send the data signals at a constant speed onto the transmission line. The sampling pulse train and the pulse train which is used for shifting the register which is storing the data signals are frequency modulated in accordance with the scanning speed of a scanning point on the subject copy so that the stored data is speed corrected at the time of storing.
Abstract:
A flatbed scanner document scanner includes a large format document scanner body accommodating a rectangular rigid frame with an upwardly facing plane face and a rectangular transparent plate for supporting a large format document. The rectangular transparent plate overlies the upwardly facing plane face all around the metal frame. The scanner also includes a movable carriage configured to move along and below the rectangular transparent plate and carrying a line camera extending across the rectangular transparent plate. The rectangular transparent plate and the metal frame are bonded together by a hard glue seam that runs on the upwardly facing plane face of the metal frame. A predetermined deflected shape can be formed when the bonded plate and frame are turned upside-down. The rectangular metal frame can deform under its own load to a cambered shape, a flat shape or a less deflected shape when turned upright in a normal position.
Abstract:
This image reading apparatus, includes: a first retaining member that retains a lens unit; a second retaining member that retains a sensor unit; and a positioning member that sets a relative position between the first retaining member and the second retaining member, wherein the positioning member comprises: a first concave portion that is sagged from a first contact surface to be in contact with the first retaining member; and a second concave portion that is sagged from a second contact surface to be in contact with the second retaining member, and the positioning member is fixed to the first retaining member and the second retaining member by an adhesive filled in the first concave portion and the second concave portion.
Abstract:
This invention is directed to an image printing apparatus which can print images without any halfway offset or obverse/reverse pixel offset at a low cost. An image printing apparatus includes a clock generating section which generates a dot clock as the basis of each pixel forming an image, an image printing section which prints a one-line image in a main scanning direction in accordance with image data with reference to the dot clock output from the clock generating section, and prints a one-page image by repeating in the sub-scanning direction one-line image printing performed in the main scanning direction, and a clock control section which changeably controls the frequency of the dot clock during scanning of one line in the main scanning direction.
Abstract:
This invention is directed to image reading capable of suppressing EMI unwanted radiation while maintaining image quality. To accomplish this, the following processing is executed when reading an original image by a photoelectric transducer. More specifically, a first driving signal where SSCG spread modulation is applied, and a second driving signal where no SSCG spread modulation is applied are generated from a reference signal. Either the first or second driving signal is selected, and a timing signal for reading the original image is generated based on the selected driving signal. The image signal obtained by the photoelectric transducer is latched using the timing signal. The latched image signal is transferred for subsequent image processing. Upon reading a one-line image original, the second driving signal is selected till the completion of the latch operation, and after the latch operation, the first driving signal is selected for an image signal transfer operation.
Abstract:
A first main-scanning-position correction unit divides a surface to be scanned into first areas in a main scanning direction into areas, sets a separate clock-pulse timing for first area, and corrects a main-scanning position error. A second main-scanning-position correction unit divides the surface into second areas in the main scanning direction based on first-scanning-position correction data, sets a separate clock-pulse timing for each second area, and corrects the main-scanning position error.
Abstract:
An optical component structure includes an elongate optical component, a support member to which the optical component is fixed, and an adhesive for bonding the optical component to the support member. The optical component is provided with a contacting portion and a bonding portion different in position from the contacting portion. The contacting portion is brought into direct contact with the support member in a direction perpendicular to the longitudinal direction of the optical component. The adhesive is applied to the bonding portion, but not to the contacting portion. Examples of the optical component include a linear light source unit and a lens unit used in an image sensor module.