Editing Pinball (section)

=== Bumpers ===

''Bumpers'' are round knobs that, when hit, will actively push the ball away. There is also an earlier variety of bumper (known as a ''dead bumper'' or ''passive bumper'') that does not propel the ball away; most bumpers on machines built since the 1960s are active bumpers, variously called "pop bumpers", "thumper bumpers", "jet bumpers", or "turbo bumpers". Most recent games include a set of pop bumpers, usually three, sometimes more or fewer depending on the designer's goals. Bumpers predate flippers, and active bumpers served to add interest and complexity to older games.

Pop bumpers are operated by a switch connected to a ring surrounding the bottom circumference of the bumper that is suspended several millimeters above the playfield surface. When the ball rolls over this ring and forces one side of it down, a switch is closed that activates the bumper's solenoid. This pulls down a tapered ring surrounding the central post of the bumper that pushes downward and outward on the ball, propelling it away.