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Introduction:
A mouse is an input device that can move around on a surface pointing device and controls the pointer. The pointer(also calls mouse pointer) is an on-screen object, usually an arrow, that is used to select text;access menus; and interact with programs, files or data that appear on the screen.
The mechanical mouse is the most common type of pointing device. A mechanical mouse contains a small ball that produces through a hole in the bottom of the mouse's case. the ball rolls inside the case when moving the mouse around on a flat surface. Inside the mouse, rollers and sensors send signals to the computer, telling it the distance, direction, and speed of the balls motions. This computer uses this data to position the mouse pointer on the screen.
The Optical mouse is the non-mechanical mouse. This type of mouse emits a beam of light from its underside; it uses the light's reflection to judge the distance, direction, and speed of its travel.
How Mechanical Mouse Works?
A ball inside the mouse touches the desktop and rolls when the mouse moves. A mouse contains a rotating ball with two rollers held at right angles to each other which touch the ball. The rollers register the x and y axis movements of the ball. The rollers each connect to a shaft, and the shaft spins a disk with holes in it. When a roller rolls, its shaft and disk spin.
On either side of the disk there is an infrared LED and an infrared sensor. The holes in the disk break the beam of light coming from the LED so that the infrared sensor sees pulses of light. The rate of the pulsing is directly related to the speed of the mouse and the distance it travels.
An on-board processor chip reads the pulses from the infrared sensors and turns them into binary data that the computer can understand. The chip sends the binary data to the computer through the mouse’s cord.
In this optomechanical arrangement, the disk moves mechanically, and an optical system counts pulses of light. On this mouse, the ball is 21 mm in diameter. The roller is 7 mm in diameter. The encoding disk has 36 holes. So if the mouse moves 25.4 mm (1 inch), the encoder chip detects 41 pulses of light.
How A Computer Mouse Works - Video:
Mouse - Presentation:
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