Facsimile and static presentation processing – Facsimile – Picture signal generator
Reexamination Certificate
2000-03-23
2003-10-14
Coles, Edward (Department: 2622)
Facsimile and static presentation processing
Facsimile
Picture signal generator
C358S482000, C358S463000, C358S461000, C358S465000, C358S521000, C358S003270, C358S001900, C358S447000, C358S486000, C382S275000
Reexamination Certificate
active
06633415
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image input apparatus, and relates more particularly to an image input apparatus arranged to read an image by performing scanning a plurality of times in the direction of sub-scanning, and also to a method for controlling the operation of the image input apparatus.
2. Description of Related Art
Image input apparatuses typically represented by image scanners are generally arranged to have a reading original (a sheet of paper, a book or the like) put on an original-placing board made of transparent glass, to cause an optical unit having a light source and an optical system and disposed in a space below the original-placing board to reciprocate in the direction of sub-scanning (in the direction of lines), and to lead light thus obtained from the original to a sensor which is composed of a CCD (charge-coupled device) or the like.
During recent years, the advancement of art of manufacturing semiconductors has come to permit a complex image processing operation to be easily carried out with an image input apparatus of the above-stated kind. For example, it is conceivable to read an original image by scanning the original image a plurality of times in the sub-scanning direction and to combine images thus obtained.
However, the conventional image input apparatus has presented the following problem. In the image input apparatus, a driving force of a motor is transmitted to a mechanism for moving the optical unit through a transmission means such as gears, which are in mesh with each other. These gears have a clearance or play between them. The clearance causes some backlash, which makes it difficult to cause an image input part to accurately reciprocate in the sub-scanning direction. Thus, the backlash tends to deteriorate precision in the sub-scanning direction to bring about an image discrepancy in the sub-scanning direction. Hence, resolution in the sub-scanning direction has sometimes decreased due to such backlash.
REFERENCES:
patent: 4691114 (1987-09-01), Hasegawa et al.
patent: 4933983 (1990-06-01), Hiramatsu et al.
patent: 5047871 (1991-09-01), Meyer et al.
patent: 5051842 (1991-09-01), Shimazaki
patent: 5686960 (1997-11-01), Sussman et al.
Arafune Shoji
Takayama Tsutomu
Coles Edward
Gibbs Heather D
Robin Blecker & Daley
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