Optical image scanner
AssigneeFujitsu Limited
InventorTatsuo Fujiwara
Life of this patent
Estimating the term…
Abstract
In a two-carrier type image scanner, a first carrier (10) is moved in parallel to a document surface at a scanning speed and a second carrier (20) is moved at half the scanning speed, the image scanner optically reading out image information such as figures and characters on the document surface using an optical system mounted on the two carriers. To permit the adjustment of the carrier in the roll direction to be easily conducted, one side of each of the carriers (10, 20) is movably engaged with a fixed guide shaft (46), and the other side is guided by a bearing (53) which rolls on a fixed guide rail (47) disposed in parallel with the guide shaft (46), wherein the carrier is capable of being adjusted in the roll direction with respect to the guide shaft (46) when a position of the bearing (53) with respect to the carrier is adjusted.
Claims24
An image scanner, which optically reads out image information such as figures and characters on a document surface using an optical system mounted on at least one carrier movable in a first direction with respect to the image scanner body, said image scanner characterized in that:
- one side of said carrier is movably engaged with a fixed guide shaft extending in the first direction;
- and
- a second, opposite side of said carrier is guided along a fixed guide rail disposed in parallel with said guide shaft, said carrier including pinch rollers coming into contact with said fixed guide shaft, said pinch rollers being disposed at an engaging portion of said carrier which engages said fixed guide shaft, and wherein deviation of the carrier in the yaw and pitch directions is suppressed by adjusting pinching loads of the pinch rollers with respect to the fixed guide shaft.
A two-carrier type image scanner in which a first carrier is moved at a scanning speed and a second carrier is moved at half the scanning speed, in parallel to a document surface and commonly in a first direction, said image scanner optically reading out image information such as figures and characters on a document surface using an optical system mounted on the carriers, said image scanner characterized in that:
- one side of each of said carriers is movably engaged with a fixed guide shaft extending in the first direction;
- and
- a second, opposite side of each of said carriers is guided along a fixed guide rail disposed in parallel with said guide shaft, said first and second carriers including respective, first and second pinch rollers coming into contact with said fixed guide shaft and disposed at corresponding engaging portions of said first and second carriers which engage said fixed guide shaft, and wherein deviation of each said carrier in the yaw and pitch directions is suppressed by adjusting pinching loads of the pinch rollers with respect to the fixed guide shaft.
An image scanner, which optically scans and thereby reads image information from a document surface disposed in a scanning plane, comprising:
- a first guide having an axis disposed parallel to the scanning plane and extending in a first direction;
- an optical system carrier having a first end engaging the first guide and movable therealong in the first direction and having a second end displaced from the first end;
- a second guide disposed in the first direction, parallel to and spaced from the first guide, the second end of the carrier being guided on the second guide;
- and
- pinch rollers disposed on the first end of the carrier and engaging the first guide, transversely to the axis thereof and with a selectively variable pinch load, deviation of the carrier in yaw and pitch directions being suppressed by adjusting the pinching load of the pinch rollers with respect to the first guide.
An image scanner, which optically scans and thereby reads image information from a document surface disposed in a scanning plane, comprising:
- a first guide having an axis disposed parallel to the scanning plane and extending in a first direction;
- first and second optical system carriers having respective, corresponding first ends engaging the first guide in spaced relationship and movable therealong in the first direction and having respective, corresponding second ends displaced from the respective first ends thereof, the first carrier moving at a first scanning speed and the second carrier moving at a second scanning speed which is one-half the first scanning speed and both the first and second carriers moving in parallel to the scanning plane;
- a second guide disposed in the first direction, parallel to and spaced from the first guide, the respective second ends of the first and second carriers being guided on the second guide;
- and
- first and second sets of pinch rollers respectively disposed on the corresponding first ends of the first and second carriers, respectively, and engaging the first guide, transversely to the axis thereof, with respective, first and second selectively variable pinching loads, deviation of the carrier in yaw and pitch directions being suppressed by adjusting the first and second pinching loads respectively of the first and second sets of pinch rollers with respect to the first guide.
Dependencies are inferred from the claim text.