Light gun

A light gun is a pointing device for computers and a control device for arcade and video games, shaped as a pistol.

Modern screen-based light guns work by building an optical sensor into the gun, which receives its input from the light emitted by on-screen target(s). The first device of this type, the light pen, was used on the MIT Whirlwind computer.

The light gun and its ancestor the light pen are now rarely used as pointing devices due largely to the popularity of the mouse and changes in monitor display technology—conventional light guns only work with CRT monitors.

The first light guns appeared in the 1930s, following the development of light-sensing vacuum tubes. It was not long before the technology began appearing in arcade shooting games, beginning with the Seeburg Ray-O-Lite in 1936. These early light gun games, like modern laser tag, used small targets (usually moving) onto which a light-sensing tube was mounted; the player used a gun (usually a rifle) that emitted a beam of light when the trigger was pulled. If the beam struck the target, a "hit" was scored.

These games evolved throughout subsequent decades, culminating in Sega's Periscope, the company's first successful game released in 1966, which required the player to target cardboard ships.Periscope was an early electro-mechanical game, and the first arcade game to cost a quarter per play. Sega's 1969 game Missile featured electronic sound and a moving film strip to represent the targets on a projection screen, and their 1972 game Killer Shark featured a mounted light gun that shot at targets whose movement and reactions were displayed using back image projection onto a screen.Nintendo released the Beam Gun in 1970 and the Laser Clay Shooting System in 1973, followed in 1974 by the arcade game Wild Gunman, which used video projection to display the target on the screen. In 1975, Sega released the early co-operative light gun shooters Balloon Gun and Bullet Mark.

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