Abstract:
The image reading device includes: a reading unit that includes a light source emitting light to irradiate an image on a recording medium transported in a first direction and a light receiving portion that receives light reflected by the recording medium; a transport path forming unit that forms a part of a transport path for the recording medium; a light transmitting portion that is provided in the transport path forming unit and transmits the light; and plural projection members that are provided to the light transmitting portion so as to project from the light transmitting portion toward the transport path, and that are arranged in a second direction crossing the first direction while each extending in the first direction.
Abstract:
An image scanner includes a transparent plate, a scanning device, a driving device, a positioning member, a light absorbing portion and a white reference portion. The transparent plate has an original placing surface. The scanning device irradiates an original with light by means of a light source and scans reflected light from the original. The driving device reciprocates the scanning device along the transparent plate. The positioning member positions the original placed on the original placing surface of the transparent plate. The light absorbing portion, which is disposed on the original placing surface side of the positioning member and at substantially a central portion of the positioning member in moving directions of the scanning device, absorbs ambient light entering to the original placing surface side of the positioning member through the transparent plate. The white reference portion is provided to the original placing surface side of the positioning member.
Abstract:
During a sheet-through operation, for a first original, a shading operation is performed to acquire white data and a light-quantity measuring operation is performed to acquire a reference value. For subsequent originals, only the light-quantity measuring operation is performed to acquire a subsequent light quantity. If the reference value and the subsequent light quantity differ greatly, the shading operation is performed at this time point to acquire new white data. The sheet-through operation is not stopped when the shading operation is not performed and the sheet-through operation is stopped when the shading operation is performed.
Abstract:
Disclosed herein is reference component for a sensor. The reference component comprises a calibration surface and an integrated circuit. The integrated circuit often contains a digital representation of calibration surface properties. A corresponding sensing system, printing system, method of communicating calibration data, and sensor calibration method also are disclosed.
Abstract:
An image forming apparatus to generate image data from an original document and to form an image includes a photoelectric conversion unit to sequentially convert an image of the original document scanned in a sub-scanning direction into image signals made of a plurality of pixels constituting one line in a main scanning direction, a white reference plate which is white reference for the image signals, a white reference signal generation unit to generate a white reference signal from image signals obtained by photoelectric converting an image for a given number of lines from a given read start position of the white reference plate in the sub-scanning direction by the photoelectric conversion unit, a shading correction unit to correct the image signals of the original document image photoelectric converted by the photoelectric conversion unit based on the white reference signal, and a read start position acquisition unit to calculate and acquire the read start position on the white reference plate, and the read start position acquisition unit includes a start position calculation unit to detect a portion of the white reference plate where brightness is within a given range and to calculate the read start position.
Abstract:
A movable calibration device for a sheet-fed scanner includes a calibration sheet and a cam. A scanning module scans an image on the calibration sheet for calibrating the sheet-fed scanner. The cam, driven by a motor, moves the calibration sheet into and out of a scan window of the scanning module. The calibration sheet can be moved out of the scan window without reversing the rotational direction of the motor. The entire calibration sheet is moved in a linear path.
Abstract:
A multiple-background device for a scanner and a calibration device utilizing the same principle are disclosed. The multiple-background device includes a shaft, a low-reflectance portion and a high-reflectance portion are formed along the length of the shaft. Thereby the shaft can provide various background colors, and the optical module can acquire a plurality of scan lines by means of rotating the shaft for image calibration.
Abstract:
One aspect of the invention provides an image reading apparatus including: a document placement portion on which a document is allowed to be placed; a display portion, at least a part of which is transmissive of light; an image reading unit movable along a first direction below the document placement portion and comprising an light emitting unit configured to emit light; and a control unit operable to control the image reading unit in a plurality of operation modes. The plurality of operation modes include a first operation mode that allows the image reading unit to be positioned at a first position corresponding to the display portion and cause the light emitting unit to emit the light, and the display portion is transmissive of the light emitted from the light emitting unit at the first position.
Abstract:
An apparatus and method for correcting a scanning error in a flatbed scanner, can minimize the scanning error due to deviations in position or scanning of a CCD (charge-coupled device) module by determining a scanning position, a scan region, and a scan rate for each flatbed scanner. The scanning error correcting apparatus includes a white shading plate having a black patch, a reading module for reading the white shading plate and the black patch, and a controller that compares information about the black patch read by the reading module with a predetermined reference value to correct the scanning error in the flatbed scanner. Thus, the apparatus and method can secure a scanning region in horizontal and vertical directions as wide as possible for each flatbed scanner and prevent occurrences of errors in a scanned image due to deviations of the CCD module. Furthermore, the apparatus and method provide an accurately scanned image having a desired scan rate by comparing right and left sizes and the entire scan size for a currently scanned region.
Abstract:
A double-side scanning mechanism for capturing images of a paper having two pages includes a second transparent element disposed corresponding to an outer side of a first transparent element and parallel to the first transparent element. A paper conveying device conveys a paper to pass between the first and the second transparent elements with a first page facing the first transparent element. The paper is flipped and passes over the outer side of the second transparent element with a second page facing the second transparent element. An image scanning module is disposed corresponding to an inner side of the first transparent element, for capturing the image of the first page when the paper passes between the first and the second transparent elements, and capturing the image of the second page when the paper passes over an outer side of the second transparent element.