Scanner construction and working
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The main component of the scanner is the CCD array. CCD is a collection of tiny light-sensitive diodes, which convert photons (light) into electrons (electrical charge). These diodes are called photosites.
Brighter the light hitting the diode, more will be the electrical charge. The image of the document that you scan reaches the CCD array through a series of mirrors, filters and lenses.
Components:
A lamp is used to illuminate (to throw light) the document.
mirrors, lens, filter and CCD array together make up the scan head.
The image of the document is reflected by an angled mirror to another mirror. The last mirror reflects the image onto a lens.
Most scanners today use the single pass method. The
lens splits the image into three smaller versions of the original. Each
smaller version passes through a color filter (either red, green or
blue) onto a discrete section of the CCD array. The scanner combines the
data from the three parts of the CCD array into a single full-color
image.
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The main component of the scanner is the CCD array. CCD is a collection of tiny light-sensitive diodes, which convert photons (light) into electrons (electrical charge). These diodes are called photosites.
Brighter the light hitting the diode, more will be the electrical charge. The image of the document that you scan reaches the CCD array through a series of mirrors, filters and lenses.
Components:
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