Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2000-12-27
2002-07-16
Phan, James (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C359S196100, C359S223100, C359S226200, C399S200000, C399S202000, C358S474000, C358S483000
Reexamination Certificate
active
06421158
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image scanning device with dual scanning modes, and more particularly to an image scanning device including a rotatable reflection mirror arranged in an optical scanning module of the image scanning device for selectively scanning a reflective original document or a transparent original document.
2. Description of the Prior Art
Typical image scanners are commonly categorized into reflective and transparent types. Reflective type scanner is employed for scanning of reflective document, while transparent type scanner is employed for scanning of transparent document.
Referring to
FIGS. 1 and 2
, a typical reflective type scanner is shown. The scanner
1
generally includes a top frame
11
with a document positioning plate
12
which is a plane surface made of for example glass or other light transmittable, substantially rigid material, for supporting a reflective original document
10
to be scanned, defining a document scanning window. A cover
13
is pivotally attached to the top frame
11
of the scanner
1
for covering the document positioning plate
12
during the scanning process.
The reflective type scanner
1
generally includes an optical scanning module
14
and a pair of guiding rails
15
a,
15
b.
The optical scanning module
14
is provided with a light source
16
, a plurality of light reflection mirrors
171
,
172
,
173
,
174
, a focusing lens
18
, and an image sensing module
19
such as a Charge Coupling Device (CCD) or a Contact Image Scanning (CIS). The optical scanning module
14
may be moved by a driving device (not shown) along the guiding rails
15
a,
15
b
in a direction I. When the optical scanning module
14
completes a scanning process, the image of the reflective original document
10
is scanned.
As shown in
FIGS. 3 and 4
, a typical transparent type scanner
2
is shown. The scanner
2
also includes a top frame
21
and a document positioning plate
22
. A back lighting module
23
is pivotally attached to the top frame
21
of the scanner
2
. The back lighting module
23
is provided with a back light source
26
therein.
The transparent type scanner
2
includes an optical scanning module,
24
moveably supported by a pair of guiding rails
25
a,
25
b.
The optical scanning module
24
includes a plurality of reflection mirrors
271
,
272
,
273
, a focusing lens
28
, and an image sensing module
29
. The optical scanning module
24
may be moved by a driving device (not shown) along the guiding rails
25
a,
25
b
in the direction I. When the optical scanning module
24
completes a scanning process and with the light provided by the back light source
26
, the image of the transparent original document
20
supported on the document positioning plate
22
is scanned.
The conventional reflective or transparent scanner described above can only conduct a specific scanning mode, i.e. the reflective type scanner can not conduct a transparent scanning process, while the transparent type scanner can not conduct a reflective scanning process. In prior art, there is provided with a mode-selective scanner which is capable of selectively conducting reflective or transparent scanning processes. However, the scanner is too complicated to economically manufacture. In addition, it is too complicate to assemble.
Thus, it is desirable to provide an image scanning device with a switching mechanism which is capable of overcoming the problems described above and facilitating scanning operation.
SUMMARY OF THE INVENTION
Consequently, a primary object of the present invention is to provide an image scanning device with a rotatable reflection mirror mounted in the optical scanning module. By means of the rotatable reflection mirror, the scanner is capable of conducting either a reflective scanning mode or a transparent scanning mode.
In order to achieve the object set forth, a scanner for selectively scanning reflective and transparent original document in accordance with the present invention comprises an optical scanning module provided with a rotatable reflection mirror for selectively scanning a reflective original document or a transparent original document. The rotatable reflection mirror may be rotated by a driving device comprising such as a stepping motor and a mechanical shaft coupled to the rotatable reflection mirror. At scanning a reflective document, the rotatable reflection mirror is rotated to a first reflection position. A light beam from a first light source projects to the reflective document. The image of the reflective document is reflected by the rotatable reflection mirror and a number of fixed reflective optical path mirrors, and then received by an image sensing module through a first focusing lens. At scanning a transparent document, the rotatable reflection mirror is rotated to a second reflection position. A light beam from a second light source projects to the transparent document. The image of the transparent document is reflected by the rotatable reflection mirror and a number of fixed transparent optical path mirrors, and then received by the image sensing module through a second focusing lens.
Preferably, two position detecting unites are arranged within an effective rotation radius of the rotatable reflection mirror for detecting the position of the rotatable reflection mirror.
To further understand the present invention, reference is made to the following detailed description of a preferred embodiment of the present invention, as well as the attached drawings, wherein:
REFERENCES:
patent: 6081363 (2000-06-01), Yeh
Phan James
Rosenberg , Klein & Lee
UMAX Data Systems Inc.
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