mouse (computing)

mouse (computing)
Name	Mouse
Caption	A modern Logitech wireless mouse.
Inventor	Douglas Engelbart
Invented	1964
First unit shipped	With the Xerox Alto (1973)
Related	Trackball, Touchpad, Graphics tablet

mouse (computing). A computer mouse is a hand-held pointing device that detects two-dimensional motion relative to a surface. This motion is typically translated into the movement of a cursor on a display, allowing for fine control of a graphical user interface (GUI). The device's name originates from its resemblance to the eponymous rodent, with the cord historically likened to a tail.

History

The first prototype was invented in 1964 by Douglas Engelbart and his team at the Stanford Research Institute. This wooden device, featuring two perpendicular wheels, was publicly demonstrated in 1968 during Engelbart's famous "The Mother of All Demos". The concept was later refined at Xerox PARC for use with the revolutionary Xerox Alto computer in 1973. The mouse achieved mainstream popularity following its inclusion with the Apple Macintosh in 1984 and later with the widespread adoption of Microsoft Windows. Subsequent innovations, such as the optical sensor developed by Agilent Technologies and the popularization of the scroll wheel by Microsoft, have defined its modern evolution.

Operation

A mouse functions by translating physical movement into digital signals. Early mechanical mice used a ball that rolled against two internal rollers connected to encoding wheels, a design pioneered by companies like Mouse Systems Corporation. Modern optical and laser mice use a LED or laser to illuminate the surface, with a CMOS sensor capturing successive images; an onboard DSP compares these images to calculate movement. This data is sent to the computer's Operating system, which moves the on-screen cursor accordingly. The tracking technology is complemented by components like microswitches for buttons and encoders for wheels.

Types

Mice are categorized primarily by their motion-detection technology. The ball mouse was dominant until largely supplanted by the Optical mouse, which uses an LED and sensor. Further refinement led to the Laser mouse, which offers higher sensitivity on a wider variety of surfaces. Specialized variants include the gyroscopic or air mouse that uses an IMU for motion sensing in free space, and the 3D mouse designed for navigating in CAD and 3D computer graphics applications. Other forms include ergonomic designs and mice built for competitive gaming.

Connectivity

Traditionally, mice connected via dedicated ports like the PS/2 interface or serial ports like the DE-9. The USB has become the universal standard for wired connectivity. For wireless communication, most mice use radio frequency via a small USB receiver using proprietary protocols or the standardized Bluetooth technology. Early cordless models also utilized Infrared communication, which required a clear line of sight to the receiver. The shift to wireless was heavily driven by companies such as Logitech and Microsoft.

Buttons and features

The standard mouse features at least two primary buttons (for clicking and right-clicking) and a scroll wheel, a feature popularized by the Microsoft IntelliMouse. Many mice include additional programmable buttons, often used for browser forward/back commands or macros in gaming. High-precision sensors are measured in DPI or CPI. Advanced features can include adjustable weight systems, RGB lighting, onboard memory for profiles, and hyper-fast polling rates. Some designs, like the Apple Magic Mouse, incorporate multi-touch surfaces instead of physical buttons.

Applications and ergonomics

Beyond general computing, specialized mice are critical in fields like digital content creation, Esports, and Computer-aided design. Prolonged use has been associated with repetitive strain injuries, leading to the development of ergonomically shaped mice, vertical mice, and devices like the RollerMouse or Trackball that aim to reduce wrist pronation. The design and implementation of pointing devices remain an active area of research in Human–computer interaction, influencing the development of alternative interfaces like touchscreens and gesture controls.

Category:Computer peripherals Category:Pointing devices Category:American inventions