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 in which an original is illuminated with visible light and with infrared light, and in which a lens assembly forms an image of the original on the surface of a reading device such as a CCD. The lens assembly is housed in a lens barrel. A focus correcting device such as a flat glass or resin plate is movably mounted to the lens barrel, so as to correct defocus of the original on the surface of the reading device due to differences in wavelength between the visible light and the infrared light. The lens assembly includes a resin lens which is disposed on a side of the lens assembly nearest to the reading device, and which is mounted in close proximity to the focus correcting device.
Abstract:
A scanning module includes a main body and a sensor module. The sensor module includes a circuit board, a sensing element, an image sensor adjustable mechanism and four adjustable rods. By means of the image sensor adjustable mechanism and these four adjustable rods, the positions of the sensing element can be controlled in seven degrees of freedom.
Abstract:
A scanning module of an image scanner for scanning a document is provided. The scanning module of the image scanner includes a base, a reflective mirror stand, a shaft, a reflective mirror member and a gear set. The reflective mirror stand is mounted on the base. The shaft is rotatably mounted on the reflective mirror stand. The reflective mirror member is fixed on the shaft and rotated with the shaft. The gear set is pivotally coupled to the shaft for rotating and driving the shaft to adjust the reflective angle of the reflective mirror member, which is fixed on the shaft.
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:
A scanning module includes a main body and a sensor module. The sensor module includes a circuit board, a sensing element, an image sensor adjustable mechanism and four adjustable rods. By means of the image sensor adjustable mechanism and these four adjustable rods, the positions of the sensing element can be controlled in seven degrees of freedom.
Abstract:
In an image reader that adopts an off-axial optical system, an adjustable imaging mirror and a CCD fixed to a highly rigid structure. Since the relative position between reflecting mirrors and imaging mirrors can be set highly accurately, adjusting only the CCD-mounting position allows a required specification of the read image to be met. The imaging mirror can easily be adjusted without distorting the reflecting surface when necessary. The reflecting mirrors, the imaging mirrors, and the CCD-mounting-position adjusting means are positioned directly to reflecting-mirror supporting sections, imaging-mirror supporting sections, and CCD supporting sections, which are integrated with a carriage casing, and fixed to them. The CCD is fixed to the carriage casing with the CCD-mounting-position adjusting means. An imaging mirror close to a diaphragm and adjacent to the image is supported by a mirror adjusting plate. The position of the imaging mirror is adjusted by displacing the mirror adjusting plate.
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:
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).