Computer Mouse Circuit

In computing, a mouse is a pointing device that functions by detecting two-dimensional motion relative to its supporting surface. Physically, a mouse consists of an object held under one of the user's hands, with one or more buttons.

The mouse sometimes features other elements, such as "wheels", which allow the user to perform various system-dependent operations, or extra buttons or features that can add more control or dimensional input. The mouse's motion typically translates into the motion of a pointer on a display, which allows for fine control of a graphical user interface.

Who Invented Mouse???

Invented by Douglas Engelbart in 1963 while working at Xerox PARC, who at the time was working at the Stanford Research Institute, which was a think tank sponsored by Stanford University. The mouse allows an individual to control a pointer in a graphical user interface (GUI). Utilizing a mouse a user has the ability to perform various functions such as opening a program or file and does not require the user to memorize commands, like those used in a text-based command line environment such as MS-DOS.

The Mouse was originally referred to as an X-Y Position Indicator for a Display System. Xerox later applied the mouse to its revolutionary Alto computer system in 1973. However, because of Alto's unfortunate success, it was first widely used in the Apple Lisa computer. Today, a pointing device is found on virtually every computer.

 

Mechanical Mouse

MECHANICAL MOUSE.

A mechanical mouse is a computer mouse that contains a metal or rubber ball on its under side. When the ball is rolled in any direction, sensors inside the mouse detect this motion and move the on-screen mouse pointer in the same direction.

Optical and Laser Mouse

OPTICAL MOUSE

Optical mice make use of one or more light-emitting diodes (LEDs) and an imaging array of photodiodes to detect movement relative to the underlying surface, rather than internal moving parts as does a mechanical mouse. A laser mouse is an optical mouse that uses coherent (laser) light.

The earliest optical mice detected movement on pre-printed mousepad surfaces, whereas the modern optical mouse works on most opaque surfaces; it is unable to detect movement on specular surfaces like glass. Laser diodes are also used for better resolution and precision. Battery powered, wireless optical mice flash the LED intermittently to save power, and only glow steadily when movement is detected.

Mechanical Vs. Optical Mouse 

Cursor Accuracy 

The cursor accuracy of an optical mouse is typically high as it can analyze changing positions at 700 mm/sec and read up to 200 to 300 dots per inch. This means that it reads its location fast with high precision.
In comparison to a mechanical mouse, an optical mouse does not wear down in accuracy because it does not have the same moving parts that a mechanical mouse has. However, the accuracy can be reduced if the open hole leading to the laser area is dirty.

 

Convenience 

The optical mouse can be used on almost any surface as long as the laser can read the surface it is on. This means you could use the mouse on your leg, a notebook or almost any other object. 

Mechanical mice require a hard, flat and frictional surface for proper functioning. This makes the optimal mouse much more convenient to use on the go. 

 

Energy 

One area that the optical mouse suffers is in energy use.An optical mouse requires a steady stream of energy so that it can constantly relate the mouse's position to the cursor due to the constant images the mouse takes.  Since friction and the movement of a tracking ball are used for a mechanical mouse, the energy required for its use is significantly lower than the optimal mouse. 

 

Surface Issues

The optical mouse uses the different surface images to adjust the cursor on your screen; however, surfaces that are shiny or are made of glass mirror and reflect the laser picture back to the picture reader software. This tricks the software into thinking that the mouse is not moving because its seeing its own reflection. You should avoid these types of surfaces when using an optical mouse.

A mechanical mouse has a ball that turns rollers inside. If friction is lost between the ball and the mousing surface, or between the ball and the rollers, the mouse fails to work. In order to assure good contact with the mousing surface, the ball must be fairly heavy. When you change directions with the mouse, you must make the ball change rolling directions--an action that inertia likes to prevent. 

 

 

Optical mouses generally have less moving parts than mechanical mouses in addition they have much higher sensitivity and are useable on almost any surface. This makes optical mouses much more popular than mechanicals, as a result the use of mechanical mouses is on the decline.  

reference:
wikipedia-mouse(computing)