Multiple position guiding lens image scanning method

Details Multiple position guiding lens image scanning method Multiple position guiding lens image scanning method

2001-07-26

2002-05-21

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S201100, C359S212100, C359S900000, C358S483000, C358S494000, C358S497000

Reexamination Certificate

active

06392774

ABSTRACT:

BACKGROUND OF INVENTION
1. Field of the Invention
The present invention relates to a method of image scanning used in a scanner, and more particularly, to an image scanning method that improves scan quality.
2. Description of the Prior Art
Please refer to FIG.
1
.
FIG. 1
is a diagram of a prior art scanner
10
. The scanner
10
comprises a light source
12
for illuminating a document
14
to be scanned, a transparent panel
16
for supporting the document
14
, and a scanning module
18
for scanning light from the document
14
. When performing a scan, the light source
12
and the scanning module
18
move simultaneously to scan the document
14
.
As shown in
FIG. 1
, the scanning module
18
has a plurality of light sensors
20
for converting light from the light source
12
to digital image signals. Light is directed to the plurality of sensors
20
by three guiding lenses
22
A,
22
B,
22
C and a lens
24
.
A common problem is scratches or dust on one, or more, of the guiding lenses
22
A,
22
B,
22
C, which leads to poor scan quality, examples including, but not limited to, shadows or stripes on the output image.
SUMMARY OF INVENTION
It is therefore a primary objective of the present invention to provide a method of image scanning that increases the probability of a quality scan.
In a preferred embodiment, the present invention provides a method of image scanning used in a scanner. The scanner comprises a light source for illuminating a document to be scanned, and a scanning module for scanning light from the document and generating an image signal of the document. The scanning module comprises a plurality of light sensors for sensing the light from the document, and a guiding lens for delivering light from the document to the light sensors. The guiding lens moves in a direction perpendicular to the normal of the guiding lens, and it may be set on at least a first and a second position. The method starts by using the light source and the scanning module to obtain a first reference image signal by scanning a reference picture at the first position. At the second position, the light source and the scanning module are used to obtain a second reference image signal by scanning a reference picture. According to the first reference image signal and the second reference image signal, the guiding lens is set to either the first position or the second position. Then, the document is scanned.
If the first reference image signal has fewer flawed areas than the second reference image signal, the guiding lens is moved to the first position to scan the document, and if the second reference image signal has fewer flawed areas than the first reference image signal, the guiding lens is moved to the second position to scan the document.
It is an advantage of the present invention that the probability of a quality scan is increased.
These and other objectives and advantages of the present invention will no doubt become obvious to those of ordinary skill in the art after having read the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.


REFERENCES:
patent: 5726775 (1998-03-01), Walsh

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