Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
1998-03-26
2001-01-16
Le, Que T. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C358S475000
Reexamination Certificate
active
06175110
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a built-in scanner, and more particularly, to a built-in scanner that scans transparent and reflective documents by using single light source.
2. Description of the Prior Art
Science progresses have significantly brought many scanners to be manufactured for achieving kinds of requirements. Except a requirement of higher resolution, the scanners are requested to be standard equipment for building in a computer case.
Conventionally, the built-in scanners are usually constrained by usable spaces, and therefore the scanning range is serious influenced because the sizes of the mechanical and optical components can not be effective reduced. Furthermore, lights illuminated from two ends of the lamps are usually with insufficient brightness for scanning. For example, in the
FIG. 4
, it is obvious that the illuminating effective length
402
will be shorter than the lamp length
401
. The darkest brightness of the illuminating effective length
402
is a half of the lamp center (B
0.5
). A label
403
indicates a lamp length with at least 90% brightness of the lamp center (B
0.9
), and ineffective parts that indicated by a label
404
are about 20 millimeters. Clearly, only the length indicated by the label
403
can be applied as a light source for scanning. Therefore, the effective range is constrained under the area of 4 inches by 6 inches.
Typical built-in scanners can only scan reflective documents, such as papers, photo, and business cards because the light source is usually allocated at the scanned side of the scanned documents. Those transparent documents such as projection slides or lantern slides can not be scanned directly in the conventional built-in scanners, and additional peripheral devices are needed for scanning such documents. A requirement has been arisen to disclose a built-in scanner, in which both the reflective and the transparent documents can be scanned without additional peripheral devices.
SUMMARY OF THE INVENTION
The object of the invention is to provide a built-in scanner that scans both the reflective and the transparent documents without additional peripheral devices.
Accordingly, the invention discloses a built-in scanner that applies a single light source to scan both the reflective and the transparent documents according to their materials. After the single light source is properly switched according to the materials of the scanned documents, scan operations start to pick-up image information of the scanned documents. In addition, the single light source can be allocated outside the computer case so as to further increase effective scanning range.
REFERENCES:
patent: 5574274 (1996-11-01), Rubley et al.
patent: 5673125 (1997-09-01), Merecki et al.
patent: 5710425 (1998-01-01), McConica et al.
Le Que T.
Merchant & Gould P.C.
Mustek Systems Inc.
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