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Tutorial
2- Flatbed Input Devices

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CE406
– Computer Peripherals Workshop

17CE161

Patel
Ujash S.

*Flatbed
Input devices

~Flatbed
input devices is different type of scanner like flated
scanners,sheet-fed scanner, drum scanner,portable scanner.

~The
Scanner is an input device which is scan any hard copy documents or
photos and convert it into digital format like pdf jpg,png and etc.

~Now
days the scanners are used for scan body,scan perticular object
only,or scan metal from any object.

~
But flatbed scanner means which have flate surface for scaning
object.Like photos,any documents ,magazines
.

*Type
of Flatbed Input devices.

*Flatbed
Scanner

~
Flatbed Scanner contain flat surface.so we can put any object over
flat surface and scan it.

~
Flatbed Scanner have bright light that light moving over the flatbed
surface and scan documents.

~Bright
light make using CIS or CCD array.that help to the light to take a
scan of each document and stored it into the analog signal and
convert it to the digital format like pdef and jpg png format.

*Sheetfed
Scanner

~Sheetfed
Scanner are little bit smaller then flatbed scanner.

~This
type of scanner are work as almost flatbed scanner but new is it scan
multiple pages at a time. This tpye of scanner used to scan whole
book or bunch of documents.

~The
flatbed scanner ar scan one page at a time but sheetfed scanner have
adinational functionality for paging up or down and scan them very
fast and stored into the digital format.

~Sheetfed
scanner more expensive then other Scanner beacuse it have double
bright light for scan pages very quickly.

*Portable
Scanner.

~Porable
Scanner is very smaller then above two scanner.we can take portable
scanner wherever we want.

~We
can put it into our pocket.

~This
type of scanner are used to scan huge size of any object.we just have
to move over the object and Scanner take a digital image of each side
of object and join each images that taken by scanner and convert it
to perticular format that we want.

*How
Scanner works?

~Most
scanner have Flated surface for puting object for scanning.

~Right
down of flated surface have a glass plate.glass plate size are
different in different type of scanner.

~Right
behind flated surface contain bright light we can say lamp .Which is
made up with CCFL (cold cathod flurecent lam) or xenon lamp.
This
two are used to take a electronic images of object

~The
entire things filter ,mirrors, lens, and CCD array make up with the
scan head . The scan head is moved slowly across the document by a
belt and that is attached to a stepper motor. The scan head is
attached to a bar to ensure that there is no wobble or deviation in
the pass. Pass means that the scan head has completed a single
complete scan of the document.