Input devices of computer
Keyboard
Keyboard is an input device. It is important part of computer. it is peripheral devise of computer. Keyboard like a typewriter. There are five types of keyboard. the keyboard comes in a verity of size and shape but must keyboard used with computer system have a certain number of feature in common. On keyboard there are different of keys like standard typewriter key, function keys, special propose keys, cursor movement keys numeric keys multimedia key.
mouse
The mouse is an input device of computer. It is a pointing device. It is usually has one or more button on the top. when the user rolls the mouse around the desktop the use pointer moves correspondingly on the screen. It is use to select and open the object. generally there three types of button are called right, middle (scroll) and left.
Light pen
Light pen is an optical material which looks like a dot pen. Light pen is a pointing device that can be used to choose a displayed menu on computer screen for a particular program.
Scanner
scanner is an optional input device that capture image from photographic prints like (posters, photos, magazine, paper and similar other sources). A scanner displays the capture images in computer and can be modified by software.Joystick
Joystick is a manual device which connected to computer. It has a control level( like gear level of cars). Which can help us to move cursor in a various direction to any position on the computer screen.Tracker ball
Tracker
ball
Digitizer
The digitizer device is help us to converts analog information into digital form. This device would be the glass which covers the LCD. It convert action into digital signal that like our cell phone. So that phone or other your device work. Digitizer is use to drawing, painting. And interactively selecting coordinate position.Optical mark reader (OMR)
Optical mark readerMagnetic ink character reader(MICR)
Magnetic
ink character reader(MICR) widely use by bank. It process tremendous volume of cheques. The bank's identification number and depositor which is written by special ink. That ink which use to identify the number and depositor of bank is made by magnetizable particles of iron oxide. MICR characters are printed on documents unique MICR fonts. when we use MICR the ink in the paper is first convert in magnetized and then the characters are passed over a MICR read head. Magnetic ink character reader(MICR) playback head Such as tape recorder.
Optical character reader (OCR)
The Optical character reader (OCR) flexibility marks it possible for organization to eliminate or reduce the input keying and it does not required special ink. OCR reader examine each character were made up of a collection of minute spots.
Bar code and bar code reader:
A pattern of vertical printed lines in binary coding. A barcode reader like a scanner. A computer read Bar code by light band scanner. Throw the bar code we can identifying the item of retail sales. Hand-held stationary input device used to capture and read information of bar code . Bar code scanners can be connected to computer with serial port. It also can connect by keyboard port or an interface device called a wedge . A barcode reader works by directing a beam of light which across the bar code. It measuring the amount of light that is reflected back.
Touch screen
The
touch screen is a special screen. Which has a touch sensitive transparent panel to read data. Touch screen is also input device which is computer display screen. Touch screen is also an input device. There are 3 types of touch screen:
· Resistive:
· Surface wave:
· Capacitive:
Touch pad
Touch pad is small touch sensitive pad. which used as a pointing device on some portable computer. User can move the pointer on the display unit by touch. Smart phone screen made by touch pad.
Speech or voice output device
The Speech or voice output device is another input device. It combined with appropriate software from recognition system. speech or voice input device convert a person's speech or voice into digital form.
