Abstract:
A scanning apparatus providing separate fixed object focal planes for transmissive and reflective original documents to be scanned, wherein a scan carriage containing illumination, sensor, and optical elements is moved together to scan an original document and to obtain a digitized representation thereof. The movable scan carriage has an illumination source disposed between the reflective and transmissive object focal planes, with the object focal plane to be used selected by changing the position of one or more optical elements within the scan carriage. The scan carriage is suspended along an axis substantially parallel to a scan line of a scanned original document and passing through a point substantially coincident with the scan line, thereby minimizing variations in lighting conditions due to vibration of the scan carriage.
Abstract:
A scanning apparatus providing separate fixed focal planes for transmissive and reflective original documents to be scanned, wherein a scan carriage containing illumination, sensor, and optical elements is moved together to scan an original document and to obtain a digitized representation thereof. The movable scan carriage has an illumination source disposed between the reflective and transmissive object focal planes, with the object focal plane to be used selected by changing the position of one or more optical elements within the scan carriage. The resolution of the digitized representation of the scanned original document can be determined by rotation of at least one lens about an axis substantially perpendicular to its optic axis.
Abstract:
Provided is a self-running type scanner including a movable scanner unit and a running guiding and assisting plate mounting the scanner unit for guiding running of the scanner unit. The movable scanner unit includes an illuminating light source, a step motor for running the scanner unit, an inage sensor, a controller for controlling provision of image information and running of the scanner unit, and wheels to which the rotation force of the motor is transmitted. The running assisting plate includes guides engaging with the wheels, a light transmitting area, a white area around the light transmitting area, a black area surrounding the white area and the light transmitting area, and timing marks indicative of the position for starting reading.
Abstract:
Thers is disclosed a manual scan type image reader for reading a document image by manually moving an image sensor for optically reading the image in a predetermined manual scan direction, converting the read document image into document image data, and outputting the converted document image data to an external unit. In the image reader, there is provided a ruler body including an image reading window for seeing the image therethrough formed on a bottom surface thereof so as to be opened to a top surface thereof, and plural scale lines printed with predetermined equal pitches in the manual scan direction on a bottom surface thereof. A scanner is mounted on the ruler body for movement in the manual scan direction, and the scanner includes the image sensor for reading the document image and the plural scale lines and converting them into document image data and scale image data, respectively. An image reading controller of the image reader corrects the document image data converted by the image sensor according to the scale image data converted by the image sensor so as to reproduce further document image data corresponding to the document image with predetermined equal pitches between the adjacent scale lines of the converted scale image data.
Abstract:
An optical scanner for scanning an image on a document to produce an electrical signal representing the image density of the image at successively scanned points positioned along a scan line on the document includes a platen for supporting the document in a scan plane. A rotatable mirror in the scanner optical system is rotated at a non-uniform angular velocity to scan the document at a controlled scan rate which may be selected as a uniform scan rate. Rotation of the mirror is controlled by means of a servo control loop responsive to a reference signal and to the output of a reference transducer which receives light from a reference grating as the mirror is rotated.
Abstract:
An image sensor controller and methods achieve faster image reading speeds by controlling the frequency of image sensor transfer clocks φ1, φ2 in accordance with the particular output period. Such an image sensor controller includes a drive controller that supplies to a transfer section of the image sensor transfer clocks φ1, φ2 whose clock frequency during dummy pixel output periods is faster than it is during an effective pixel output period, or whose clock frequency during non-reading pixel output periods is faster than it is during a reading pixel output period. A pattern selector selects among clock patterns in a table for setting φ1, φ2 according to the output periods of the image sensor. Even when the clock frequency of φ1, φ2 changes, a transfer clock ADCK signal can be supplied at a constant clock frequency to an A/D converter.
Abstract:
In an image reading device, light from a source document is formed in an image by an optical image-forming system including a lens and the formed image is detected by a charged coupled device (CCD) sensor. A reading line of the image read by the optical system and the CCD sensor is scanned in a vertical scanning direction. The charge accumulated in the CCD sensor is read out through a timing circuit and an analog-to-digital converter. Light from an extension of a reading line of a position-reading pattern in or on a position-reading plate is also formed into an image and detected by the CCD sensor, based on which, misregistration of a scanning position in the vertical scanning direction is detected. The image data read out by the CCD sensor is corrected by a correction circuit, based on the misregistration of a scanning position in the vertical scanning direction.
Abstract:
A scanning apparatus providing separate fixed focal planes for transmissive and reflective original documents to be scanned, wherein a scan carriage containing illumination, sensor, and optical elements is moved together to scan an original document and to obtain a digitized representation thereof. The movable scan carriage has an illumination source disposed between the reflective and transmissive object focal planes, with the object focal plane to be used selected by changing the position of one or more optical elements within the scan carriage. The resolution of the digitized representation of the scanned original document can be determined by rotation of at least one lens about an axis substantially perpendicular to its optic axis.
Abstract:
A scanning apparatus providing separate fixed focal planes for transmissive and reflective original documents to be scanned, wherein a scan carriage containing illumination, sensor, and optical elements is moved together to scan an original document and to obtain a digitized representation thereof. The movable scan carriage has an illumination source disposed between the reflective and transmissive object focal planes, with the object focal plane to be used selected by changing the position of one or more optical elements within the scan carriage. The resolution of the digitized representation of the scanned original document can be determined by rotation of at least one lens about an axis substantially perpendicular to its optic axis.
Abstract:
A scanner having an image sensor unit having a CCD linear array for electro-optically scanning an image of an original in a main scanning direction to convert the image into image data signals is used to scan, through a table sheet having a transparent document area and a pattern area which includes a stripe pattern inclined with respect to the main scanning direction, an original placed under the document area to read data of the original, and the scanner is moved relative to the original in a subscanning direction perpendicular to the main scanning direction. A pattern signal obtained by scanning the pattern area then is analyzed to detect an amount of relative movement of the scanner in the subscanning direction from the movement of the stripe pattern in the main scanning direction. Accordingly, the reading resolution in the subscanning direction which varies depending upon a high or low degree of the speed of relative movement of the scanner in the subscanning direction can be maintained suitably by adjustment of the speed of movement, or the reading speed can be raised for a predetermined resolution.