Facsimile and static presentation processing – Facsimile – Picture signal generator
Reexamination Certificate
2002-03-06
2004-03-23
Lee, Cheukfan (Department: 2622)
Facsimile and static presentation processing
Facsimile
Picture signal generator
C358S497000, C358S442000, C358S474000
Reexamination Certificate
active
06710899
ABSTRACT:
BACKGROUND OF INVENTION
1. Field of the Invention
The present invention relates to a scanner, and more specifically, to a charge coupled device (CCD) scanner powered by a serial bus.
2. Description of the Prior Art
Please refer to FIG.
1
and FIG.
2
.
FIG. 1
is a schematic view of a charge coupled device (CCD) scanner
10
electrically connected to both a universal serial bus (USB)
30
and an external power source
20
according to the prior art.
FIG. 2
is a function block diagram of the scanner
10
in FIG.
1
. The scanner
10
includes a scanning module
14
for generating image data by way of scanning a document
12
, a motor
22
for driving the scanning module
14
, and a control circuit
24
for controlling operations of the scanner
10
. The scanning module
14
further includes a light source
16
for illuminating the document
12
and a CCD
18
for detecting light reflected form the document
12
so as to generate the image data of the document
12
. The USB
30
further includes a power rail
32
to provide a power of 2.5 Watts (W). The specification of the power rail
32
is defined by companies including IBM, Intel, Microsoft, NEC, Compaq, DEC, Northern Telecom, etc. and is omitted for simplicity of description.
The scanner
10
is electrically connected to a sufficient power source to ensure the operation of the scanner
10
. Normally, a cathode ray tube, employed as the light source
16
of the scanner
10
, consumes a power of at least 16 W. In addition, the CCD
18
of the scanner
10
, the motor
22
and the control circuit
24
consume powers of 0.5 W, 1.5 W and 0.5 W, respectively. Thus the total consumption of power during the operation of the scanner
10
exceeds the power of 2.5 W provided by the power rail
32
of the USB
30
. Consequently, the external power source
20
, needing extra space, is needed for the operation of the scanner
10
in addition to the power provided by the power rail
32
of the USB
30
.
SUMMARY OF INVENTION
It is therefore a primary object of the claimed invention to provide a charge coupled device (CCD) scanner powered by a serial bus to eliminate a use of an external power source.
According to the claimed invention, the CCD scanner includes a scanning module for generating image data by way of scanning a document, a motor for driving the scanning module, and a control circuit electrically connected to the scanning module and the motor for controlling operations of the scanner. In contrast to the prior art scanner, the CCD scanner is powered only by a serial bus. The CCD scanner further includes a light source with a light emitting diode (LED) tube having at least a light emitting diode (LED), for focusing light radiated from the LID tube on the document.
In another embodiment of the claimed invention, the control circuit of the CCD scanner periodically switches the power provided by the USB to the light source and the motor. The control circuit shuts down the motor when the light source focuses light on the document, and shuts down the light source when the motor drives the scanning module, so as to ensure the power provided by the USB sufficient for the operation of the scanner.
It is an advantage of the claimed invention over the prior art that the power consumption of the scanner during the operation is significantly reduced. In addition, the scanner in the claimed invention is powered only by the power rail the USB. Eternal power sources, requiring extra space, are thus omitted.
These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment, which is illustrated in the multiple figures and drawings
REFERENCES:
patent: 6459506 (2002-10-01), Hu et al.
patent: 6465987 (2002-10-01), Haas et al.
patent: 87104814 (1998-03-01), None
Chung Ching-Fu
Lee Yu-Wen
Lee Cheukfan
Mustek Systems Inc.
Winston Hsu
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