Abstract:
A raster input scanner, and a reproduction system that uses that input scanner, having multiple depths of focus. The raster input scanner includes a light source for emitting light toward an image bearing member and at least two lens arrays, with the ability to selectably position any one lens array in optical conjugate relationship between the image bearing member on a transparent platen and a photosensor array. One of the lens arrays has a first depth of focus, while the other lens array has a second depth of focus that is different than the first depth of focus. Beneficially, the input scanner responds to an operator selection of which depth of focus is to be used to image a given image bearing member.
Abstract:
An image reading system for optically reading an original includes a convergent type light-emitting diode array as a light source, a white level reference and an image sensor disposed opposite to the white level reference. The light emitted from the LED array has a light intensity distribution which reduces in level in a transverse direction from an irradiation axis. The LED array is preferably so disposed with its irradiation axis passing a mid-point between the white level reference and an intersection point between an original surface travelling line and a straight line extending between the white level reference and the image sensor.
Abstract:
Provided is an alignment method for an image reading apparatus including: a light source unit illuminating an original on an original table; a photoelectric conversion element for converting an optical image into an electric signal; and an imaging optical system for imaging, onto the photoelectric conversion element, a light beam from the illuminated original. The imaging optical system includes: a first optical element, arranged inside a first lens barrel, and having an optical surface that is rotationally symmetric about an optical axis; and a second optical element, arranged on an optical path between the first lens barrel and the photoelectric conversion element, and having an optical surface rotationally asymmetric about the optical axis. The alignment method includes aligning at least one of an attaching angle and an attaching position of the second optical element in a sub scanning direction relative to the first lens barrel.
Abstract:
A fixture structure is disclosed that is able to independently adjust relative positions of constituent components in different directions and able to reduce workload of the relative position adjustment. The fixture structure includes plural members fixed with each other by screws, a first adjustment unit for adjusting relative positions of two or more of the members in a first direction and arranged on surfaces of the two or more members parallel to the first direction, and a second adjustment unit for adjusting relative positions of two of more of the members in a second direction intersecting with the first direction and arranged on surfaces of the two or more members parallel to the second direction.
Abstract:
An optical scanning device includes a light source, an optical system, and a housing. The light source projects a light beam. The housing includes a holder and encloses the optical system. The optical system includes a liquid crystal element held by the housing via the holder, to modulate a phase of the light beam projected from the light source against a scanned surface. The liquid crystal element includes a plurality of substantially transparent substrates, a liquid crystal layer, and a sealing member. One of the plurality of the transparent substrates has a size larger than any other transparent substrates and is positioned in the holder. The liquid crystal layer is sandwiched between the plurality of substantially transparent substrates. The sealing member seals the liquid crystal layer between the plurality of substantially transparent substrates.
Abstract:
An adjusting method for a lens unit used in an image reading apparatus which images image information of an original onto an image reading unit by the lens unit and reads the image information, the lens unit including rotationally-symmetrical lenses, a lens barrel including the rotationally-symmetrical lenses and an adjusting lens, the adjusting method including: performing rotational adjustment of the lens barrel with respect to the adjusting lens; and imaging an adjusted chart onto one-dimensional photoelectric transducers via the lens unit, obtaining contrast depth characteristics of images corresponding to at least three angles of field of the lens unit among images of the adjusted chart, and, according to the obtained contrast depth characteristics, performing position adjustment of the adjusting lens in at least one of an array direction of the one-dimensional photoelectric transducers, a direction orthogonal to the array direction and an optical axis direction of the lens unit.
Abstract:
Provided is an alignment method for an image reading apparatus including: a light source unit illuminating an original on an original table; a photoelectric conversion element for converting an optical image into an electric signal; and an imaging optical system for imaging, onto the photoelectric conversion element, a light beam from the illuminated original. The imaging optical system includes: a first optical element, arranged inside a first lens barrel, and having an optical surface that is rotationally symmetric about an optical axis; and a second optical element, arranged on an optical path between the first lens barrel and the photoelectric conversion element, and having an optical surface rotationally asymmetric about the optical axis. The alignment method includes aligning at least one of an attaching angle and an attaching position of the second optical element in a sub scanning direction relative to the first lens barrel.
Abstract:
A paper-separating plate is adapted for a paper-separating mechanism having a paper-separating roller. The paper-separating plate placed around a side of the paper-separating roller comprises a main body and a cushion. The main body has a surface and a plurality of grooves and the grooves are positioned on the surface. The cushion is positioned on the surface of the main body and covers the grooves. The cushion positioned over the partial grooves is elastically pressed onto the paper-separating roller. The grooves are linear and the direction of extending the linear grooves is substantially parallel with the axis of the paper-separating roller, the linear grooves neighboring one another or each other. Besides, the cushion is made of flexible material and the main body is made of rigid material.
Abstract:
A disclosed optical device is physically movable with respect to a document surface or an image forming surface. The disclosed optical device includes substrates; optical element groups mounted on the substrates and composed of optical elements for image scanning or image forming, adjacent ones of the optical element groups being spaced at a predetermined distance in a direction that the optical device is movable; and a joining part joining the substrates and thereby maintaining the predetermined distance, the joining part having a thermal coefficient of expansion that is smaller than that of the substrates.
Abstract:
A fixture structure is disclosed that is able to independently adjust relative positions of constituent components in different directions and able to reduce workload of the relative position adjustment. The fixture structure includes plural members fixed with each other by screws, a first adjustment unit for adjusting relative positions of two or more of the members in a first direction and arranged on surfaces of the two or more members parallel to the first direction, and a second adjustment unit for adjusting relative positions of two of more of the members in a second direction intersecting with the first direction and arranged on surfaces of the two or more members parallel to the second direction.