Pen: A light pen is a pointing device shaped like a pen and is connected to a monitor. The tip of the light pen contains a lig ht-s ensit ive element which detects the light from the screen enabling the computer to identify the location of the pen on the screen. Light pens Figure . Fingerprint Scanner Figure .
Track Ball Figure . Light Pen movement of the cursor on the display screen. It can be used to select icons, menus, command buttons or activate something on a computer. Some mouse actions are move, click, double click, right click, drag and drop.
Different types of mouse available are: Mechanical Mouse, Optical, Laser Mouse, Air Mouse, 3D Mouse, Tactile Mouse, Ergonomic Mouse and Gaming Mouse. Who invented Mouse? The computer mouse as we know it today was i n v e n t e d and developed by Douglas Engelbart, with the assistance of Bill English, during the 's and was patented on November , . ( ) Scanner: Scanners are used to enter the information directly into the c o m p u t e r ’ s memory.
This device works like a Xerox machine. The scanner converts any type of printed or written information including photographs into a digital format, which can be manipulated by the computer. ( )Fingerprint Scanner: Finger print Scanner is a fingerprint recognition device used for computer security, equipped with the fingerprint recognition feature that uses biometric technology. Figure .
Scanner Chapter Page - - have the advantage of ‘drawing’ directly onto the screen, but this becomes hard to use, and is also not accurate. ( ) Optical Character Reader: It is a device which detects characters printed or written on a paper with OCR, a user can scan a page from a book. The Computer will recognise the characters in the page as letters and punctuation marks and stores. The Scanned document can be edited using a wordprocessor.
( ) Bar Code / QR Code Reader: A Bar code is a pattern printed in lines of different thickness. The Bar code reader scans