Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2001-11-09
2004-03-09
Le, Que T. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S208100
Reexamination Certificate
active
06703604
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a scanning method for detecting documents, especially to a kind of scanning method for a scanner's detected document that can be examined as a reflection document or a transmission document.
BACKGROUND OF THE INVENTION
High technologies are progressing abruptly, especially the technology of micro-electronic processes is further changing day by day, so computer has already penetrated into every family and industry, and become an indispensable electronic product in our daily lives. Following the prevalence of computer and multi-media, it is required more peripheries as in putting and outputting devices. Since the sophisticated progress for optical and semiconductor technologies, it makes the product technology for computer relative peripheries, such as optical scanner, be increasingly improved and prevalent, and become a product of necessity for the computer's peripheries. Wherein, the optical scanner mainly applies a light source module to provide light source for scanning documents, and also applies a light-path apparatus to receive reflected image of document during scanning. The charge-coupled device retrieves document image, and the optical signal is converted into digital signal, and finally the signal is again transferred to a computer for processing an image treatment.
Please refer to
FIG. 1
, which is a three-dimensional structure illustration for an embodiment of a typically flat bed optical scanner seen in current market. Mainly, a document window glass
12
is arranged on the upper side surface of the outer shell
11
of a scanner
1
for supporting a reflective document
32
. Through a driving apparatus
13
to drive an optical chassis
14
to move linearly along a guiding rod
15
inside the hollow outer shell
11
, an image scanning job for the reflective document
32
placed on the document window glass
12
is proceeded. The document window glass
12
may also place a transparency-supporting frame
30
that is arranged with plural transmittal documents
31
. An upper transparency module
2
is arranged for providing a light source to make the driving apparatus
13
drive the optical chassis
14
moving linearly along the guiding rod
15
inside the hollow outer shell
11
and proceed image scanning job for the transmittal document
31
placed on the document window glass
12
.
Please refer to
FIG. 2A
, which shows an illustration of cross-sectional structure for a flat bed optical scanner with upper transparency module of prior transmission type. Wherein, a transparency-supporting frame
30
is placed on the outer shell
11
, and an upper transparency module
2
is arranged on the rear lid. An upper transparency assembly
21
is arranged inside the upper transparency module
2
. There is a lamp
211
inside the upper transparency assembly
21
. The upper transparency module
2
is arranged with at least one guiding rod
22
and the upper transparency assembly
21
is moved back and forth along the extension direction of the guiding rod
22
inside the upper transparency module
2
for matching the image scanning job for the transmittal document
31
of the optical chassis
14
.
And,
FIG. 2B
is an illustration of the cross-sectional structure for a flat bed optical scanner with the upper transparency module of prior fixation type. Wherein, an upper transparency cover
23
is arranged inside the upper transparency module
2
. A lamp
231
arranged on both sides provides light for the upper transparency cover
23
for matching the image scanning job for the transmittal document
31
of the optical chassis
14
. From above description, in the upper transparency assembly
21
, the lamp
211
and the upper transparency cover
23
provide the light source for image scanning job for the transmittal document
31
.
Please refer to
FIG. 3A
, which is an illustration of light progressing path for prior reflective document in reflective scanning mode apparatus to execute scanning job. Wherein, the optical chassis
14
includes: a hollow shell body
114
, a first light source
142
positioned at appropriate position on the upper side surface of the shell body
141
, plural reflection mirrors
143
, a lens set
144
, and a charge-coupled device
145
. The first light source
142
emits light to the reflective document
32
placed on the document window glass
12
. The reflected light, entering into the shell body
141
of the optical chassis
14
, is reflected and direction-changed by the plural reflection mirrors
143
to increase its optical length to an appropriate length. Afterwards, the reflected light is focused by the lens set
144
and imaged onto the charge-coupled device
145
that converts the scanned image data into electronic signals.
FIG. 3B
is an illustration of light progressing path for transmittal document in prior reflective scanning mode apparatus to execute scanning job. Wherein, after the light emits from the first light source
142
and is incident onto the transmittal document
31
placed on the transparency-supporting frame
30
, the light will penetrate through the transmittal document
31
and be incident onto the upper transparency cover or a bottom surface (not shown in the drawings) of the upper transparency module
2
. So, the image formed on the charge-coupled device
145
is the image of the upper transparency cover
23
or the bottom surface.
Please refer to
FIG. 4A
, which is an illustration of light progressing path for transmittal document in prior transmittal scanning mode to execute scanning job. Wherein, after the light emits from the second light source
24
(as described in FIG.
4
A and
FIG. 4B
) and is incident onto the transmittal document
31
placed on the transparency-supporting frame
30
, the light will penetrate through the transmittal document
31
and enter into the shell body
141
of the optical chassis
14
, the light will be reflected and direction-changed by the plural reflection mirrors
143
. Finally, the lens set
144
will focus the reflected light into image formed on the charge-coupled device
145
. And, the charge-coupled device
145
will convert the scanned image data into electronic signals.
FIG. 4B
, which is an illustration of light progressing path for reflective document in prior transmittal scanning mode to execute scanning job. The light from the second light source
24
is incident on the reflective document
32
placed on the document window glass
12
. Since the reflective document
32
blocks the progressing of light emitting from the second light source
24
, so the images formed on the charge-coupled device
145
are all patterns of dark color.
In summary of above description, it is impossible to detect and select a scanning mode appropriately during executing a scanning job on an applied document, so a scanned output frequently dose not fulfill our requirements because of executing a wrong scanning mode. Therefore, it is required an operation personnel standing by to switch an appropriate scanning mode. This wastes lots of human labor and material means because of mistaken scanning. So, the solution of this problem is urgently required by the industry and relative enterprise of scanner making.
SUMMARY OF THE INVENTION
The main object of the present invention is to provide a scanning method for detecting documents. The scanning method may provide automatic detection on scanned object to decide it belonging to reflective document or transmittal document for executing a scanning job with switching accurate scanning mode and insuring the user to operate the scanner conveniently.
To fulfill above-described object, a scanning method for detecting documents is comprised of following steps:
Step A: providing an optical scanning device, capable of a reflective scanning mode or a transmittal scanning mode to proceed scanning job on a scanned object.
Step B: selecting one scanning mode and retrieving an image signal generated by applying the scanning mode on the scanned object.
Step C: comparing the image signal with a pre-determine
Chen Cheng-Kuei
Tseng Jen-Shou
Spears Eric J
Umax Data Systems Inc.
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