Abstract:
For preventing occurrence of interference fringes derived from interference of light rays on a contact plane between a contact glass and a cover glass, and thus homogenizing an output wave that may otherwise undergo the adverse effect of interference fringes, a close-contact type image sensor includes a contact glass arranged to come into contact with a read surface of an original, a light source for irradiating light to the read surface, an image forming lens for converging light reflected from the read surface, an image sensor part for reading an image of the original formed on an image plane of the image forming lens, and a cover glass for fixing the light source and the image forming lens at respective predetermined positions in a housing, wherein an air layer is present between the contact glass and the cover glass.
Abstract:
An image reading imaging optical system for imaging image information on a line sensor and reading the image information has an imaging optical element including a plurality of off-axial reflecting surfaces differing in the direction of incidence and the direction of emergence of a reference axis ray from one another and having curvatures.
Abstract:
An image sensor has a supporting member for integrally supporting a reading system including illuminating means for illuminating an original document, a photoelectrically converting means and imaging means for imaging light reflected by the surface of the original document onto the photoelectrically converting means, and has a member disposed on the side surface of the supporting member. The image sensor has two or more substantially independent spaces formed in the supporting member. The illuminating means, the imaging means and the photoelectrically converting means are accommodated in one of the spaces.
Abstract:
A scanning apparatus for preventing defocus aberration is provided. The scanning apparatus includes a flatbed scanning portion and a scanning module. The flatbed scanning portion includes a glass platform. The scanning module includes a scanning module case, a light source, multiple reflective mirrors, a lens, an optical sensing element, a printed circuit board and a metallic post. The metallic post is interconnected between the scanning module case and the printed circuit board. The printed circuit board is not in direct contact with the scanning module case so as to prevent defocus aberration resulting from thermal expansion.
Abstract:
A flat bed scanner having a transparent platform and a scanning mechanism is provided in the present invention. The transparent platform is used to support the objects that wait for scanning. The scanning mechanism is movably placed under the transparent platform along the length direction of the transparent platform. The scanning mechanism includes a plurality of LEDs, a camera lens and a CCD. The LEDs are arranged in a line along the width direction of the transparent platform. The scanning mechanism further includes a diffuser that is placed over the LEDs and has the same width with the transparent platform, and the diffuser diffuses the light beams radiated from the LEDs and then projects the light beams being diffused over the objects that wait for scanning.
Abstract:
An optical scanner system wherein the central region of the light source is selectively covered up by a mechanically actuated shutter during a transparency scanning mode. By occluding the central portion of the light source, problems with flare and degraded image quality are eliminated. The shutter is actuated to its two positions (normal reflective mode position, transparency mode position) by pins, protrusions, or the scanner walls in the scan module path. When the scan module is driven to the extremes of its travel the shutter is either driven open or closed. A bracket structure is provided to hold the transparent media and a covering light reflective tent, and can include the pin or pins that can protrude into the scanner module path and thus actuate the shutter only when the structure is mounted on to the scanner by the user. The bracket structure can include a lower member that rests directly on the platen glass to align filmstrips, slides, and other transparent media. The tent structure is hinged relative to the lower structure which allows it to be opened and closed to enable insertion of transparent media. When the tent structure is closed it acts as the reflective light path to allow light from the primary light source to be reflected up, over, and down through the transparent media, and into the optical light path leading to the optical sensor.
Abstract:
A contact image sensor includes a light sensitive optical detector and a light source mounted on a mounting surface. A light guide is located under the light source and is oriented to direct a light path from the light source to a scan line region under the light sensitive optical detector.
Abstract:
An image reading apparatus includes a light source, an elongate light guide member for guiding light emitted from the light source toward an image read line, and a plurality of light receiving elements for receiving light reflected at the image read line. The light guide member includes a first portion, a second portion, and a connecting portion for connecting the first portion and the second portion. The first portion includes a light incidence surface facing the light source for entry of light emitted from the light source, and the light incidence surface is convexly curved widthwise of the light guide member. The second portion includes a light exit surface oriented toward the image read line for emitting light toward the image read line. The connecting portion is narrower than the first portion and the second portion.
Abstract:
A document scanning apparatus for scanning a document is provided. The document scanning apparatus includes an image sensor unit which irradiates an incident light towards the document and generates image data by sensing a reflected light reflected from the document, a supporting unit which supports the image sensor unit, a movement unit which moves the image sensor unit between a scanning position and a calibration position, a housing which houses the image sensor unit, the supporting unit, and the movement unit, a transparent plate which transmits the incident light and the reflected light, a calibration sheet which is attached to a surface of the transparent plate, which is exposed to outside and is positioned in an area including the calibration position, and a housing cover which is coupled to the housing and seals inside of the housing.
Abstract:
An illuminator includes a light guide having a circular cross-section, a scatterer that is provided on a portion of the circumference of the circular cross-section and that radiates scattering light toward the inside of the light guide, and a condensing lens that condenses light emitted from the light guide and transforms the light into a linear beam, a planar beam, or a point-like beam. In the illuminator light from the light source is effectively utilized, and the light can efficiently illuminate the required illumination area. In addition, an image reader apparatus can perform high-speed reading using such an illuminator.