Robotic Vacuum

In the early 1990s, the Swedish home appliance manufacturer Electrolux sought to build an autonomous machine capable of sweeping domestic floors without human supervision. Engineer Anders Haegermarck led the technical effort alongside colleagues Lars Kilstrom and Bjorn Riise in Stockholm, developing a low-profile disc that used acoustic ultrasound sensors to map room perimeters and avoid furniture. Electrolux filed foundational international patent applications for the device's propulsion, nozzle assemblies, and sonar navigation systems between 1996 and 1997, including patent US5781960A and patent WO1997040734A1

Electrolux publicly unveiled a prototype on the BBC television programme Tomorrow's World in May 1996, demonstrating autonomous domestic floor cleaning to the public for the first time. Named the Trilobite after the extinct seafloor-scavenging arthropod, the machine went into full commercial production in 2001. The initial ZA1 model relied on acoustic sonar pings and magnetic wall strips to navigate, returning to its charging dock when low on battery power. However, its high retail price of roughly two thousand dollars kept it largely confined to early adopters and luxury consumers.

The technology reached the mass consumer market in September 2002 when American robotics company iRobot released the Roomba in Burlington, Massachusetts. Developed by Joseph L. Jones and fellow roboticists, as described in patent US6883201B2 https://patents.google.com/patent/US6883201B2/en, the Roomba replaced complex acoustic mapping with low-cost infrared sensors, bumper collision logic, and behavioral bouncing algorithms. This radical reduction in sensor complexity lowered retail prices to roughly two hundred dollars, turning the autonomous floor cleaner from an experimental luxury into a mainstream household appliance.