Abstract:
In an image reading apparatus having an easy-to-adjust optical system, a unit is composed of a first sub-unit including an image forming lens and a second sub-unit including a solid-state image pickup element. The first sub-unit and the second sub-unit are mutually adjusted in position in X-axis, Y-axis and Z-axis while the two sub-units are also adjustable around X-axis and Z-axis. After the first sub-unit and the second sub-unit are adjusted using a tool, the unit is then assembled into the apparatus. The unit is rotated around an optical axis of the image forming lens for adjustment of perpendicularity. The unit is also rotated around a line direction of the solid-state image pickup element for adjustment of scanning synchronization (the reading position in a sub-scan direction).
Abstract:
There is disclosed an image reading apparatus in which the scanning optical system having a slit (16) is caused to scan in a short-side direction of the slit (16), and light passed through the slit (16) and reflected from or transmitted through an original is guided to a solid-state image pickup element (32) through an optical image forming element (3) so that the image is formed on the solid-state image pickup element (32) and is read. In the apparatus, opening portions for detecting a shift in relative positional relationship between the slit (16) and the solid-state image pickup element (32) are formed in both end portions of the slit (16) in its longitudinal direction corresponding to a portion other than an effective image region of the solid-state image pickup element (32).
Abstract:
A mount for an optical device, such as a linear CCD array, is disclosed. The array is mounted on a base which is supported on a frame for adjustment relative thereto. The base is slidably movable on the frame for adjustment of the array in in-track and cross-track directions. The base is movable toward and away from the frame to provide a focus adjustment of the array. In order to provide a mount which can be easily and precisely adjusted to position the array along five degrees of freedom, adjustment screws are positioned such that the position of the array can be changed along one degree of freedom without changing the position of the array along any of the other degrees of freedom.
Abstract:
PROBLEM TO BE SOLVED: To provide an image reading apparatus in which the optical adjustment of mirrors is facilitated when supporting carriages, on which the mirrors are mounted, on right and left rail surfaces movably along a platen. SOLUTION: The image reading apparatus is configured to guide reflection light from a document to an image reading means 11 through first and second carriages 3 and 4 moving at a predetermined speed along a document image on a platen. The first carriage 3 supports a mirror at three points such that a one-side end of a mirror is supported by first and second mirror supporting parts 32a and 32b and an other-side end is supported by a third mirror supporting part 32c. Both-side ends of the first carriage are then supported to be slidable on a pair of right and left rail members 5a and 5b through slide members 33a-33d disposed at two positions on forward and backward sides, respectively, at four positions on right and left sides. At least one of the slide members 33c and 33d at two positions on the forward and backward sides disposed at a side of the third mirror supporting part supporting the first mirror at one point is supported by an adjustment screw or the like so as to adjust its position in height. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
An optical reading device of a scanning apparatus includes two light sources and a movable lens. The first light source emits a first light when the optical reading device is operated in a flatbed scanning mode. The second light source emits a second light when the optical reading device is operated in a sheetfed scanning mode. The movable mirror is selected to allow for passing the first light without being obstructed by the movable mirror in the flatbed scanning mode or allow for reflecting the second light coming from the second mirror in the sheetfed scanning mode. Due to the special design, the overall volume of the scanning module is reduced.
Abstract:
An image reading apparatus has a platen, first and second carriages, a light source supported on the first carriage, a first mirror to deflect reflected light from the original document toward the second carriage, one or more second mirrors supported on the second carriage to guide the light from the first mirror to image reading device, and rail members. The first carriage has first and second mirror support portions for supporting one side edge portion of the first mirror by two points, and a third mirror support portion for supporting the other side edge portion by one point. The first carriage is supported slidably at its opposite side edge portions respectively on the rail members via slide members disposed at four right and left places including two front and back places, and a height position is adjustable for supporting the first mirror by one point.
Abstract:
PROBLEM TO BE SOLVED: To provide a scanner core structure in which a second light source and a movable lens are designed and the overall volume of a scanner can be reduced. SOLUTION: A scanner core structure includes: a movable lens which passes a first light beam during platform type scanning or reflects a second light beam incident from a second lens during sheetfed scanning; a group of lenses reflecting the first light beam or the second light beam incident from the first lens or the movable lens in order; a lens for converging the first light beam or the second light beam introduced from the group of lenses; and a light beam detection element which receives the first light beam or the second light beam converged from the lens and converts the first light beam or the second light beam into an electronic signal. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
An image reading apparatus including a shading correction mechanism that can be formed by fewer component parts than conventional ones, and is increased in the degree of freedom of design, thereby enabling reduction of the size and weight thereof. A contact glass guides an original to an image reading position. A glass holding member holds the glass. A line image sensor reads an image on the original conveyed to the image reading location, through the contact glass. A reference member is disposed at a location different from the image reading location on the contact glass. A moving mechanism relatively moves the line image sensor and the reference member so that the line image sensor can alternatively read the original conveyed to the image reading location and the reference member. A drive section externally drives the moving mechanism to move the line image sensor and/or the reference member.
Abstract:
An image reading apparatus including a shading correction mechanism that can be formed by fewer component parts than conventional ones, and is increased in the degree of freedom of design, thereby enabling reduction of the size and weight thereof. A contact glass guides an original to an image reading position. A glass holding member holds the glass. A line image sensor reads an image on the original conveyed to the image reading location, through the contact glass. A reference member is disposed at a location different from the image reading location on the contact glass. A moving mechanism relatively moves the line image sensor and the reference member so that the line image sensor can alternatively read the original conveyed to the image reading location and the reference member. A drive section externally drives the moving mechanism to move the line image sensor and/or the reference member.
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.