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Tutorial on : Printers and Scanners
2.Introduction to Scanners
Components inside a scanner are the following
2.1 Overview of components
i. Glass Plate and Cover
The glass plate is the transparent plate wherein the original is placed so that the scanner can scan it and the cover keeps out stray light that can affect the accuracy of the scan
ii. Scanning head
Scanning head is the most important component because it is the one which does actual scanning. It contains components like
1. Light source and mirror : It is the bright white light that is used to illuminate the original as it is being scanned and which bounces off the original and reflected off several mirrors
2. Stabilizer bar: It is a long stainless steel rod that is securely fastened to the case of the scanner and it provides a smooth ride as the scanner scans down the page
3. CCD (Charge Coupled Device) or CIS (Contact Image Sensor) : A CCD array is a device that converts photons into electricity. Any scanner that uses CCD use lens to focus the light coming from the mirrors within the scanning head.
Another technology used in some cheaper scanners is CIS wherein the light source is a set of LEDs that runs the length of the glass plate.
iii. Stepper Motor
The stepper motor in a scanner moves the scan head down the page during scan cycle and this is often located either on the scan head itself or attached to a belt to drive the scanner head.
2.2 Types of Scanners
1. Flatbed Scanners
2. Sheetfed Scanners
3. Handheld Scanners
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