Autonomous vacuum cleaner

An autonomous vacuum cleaner, comprising:

• an autonomously moveable housing, a controller, and a drive system operably coupled to the controller;
• a bumper assembly configured to slide in response to a force, wherein at least a portion of the bumper assembly slides within a clearance provided within the autonomously moveable housing;
• a first optical sensor configured to detect a presence or absence of a light beam that is indicative of a position of the bumper assembly relative to the clearance;
• wherein the bumper assembly includes at least one bumper with a rib that is displaced when the force is applied to the bumper assembly, wherein the rib is normally disposed in an air gap to block passage of the light beam through the air gap, and the rib is movable out of the air gap to allow passage of the light beam through the air gap when the force is applied to the bumper assembly;
• a plurality of other optical sensors that have overlapping fields of view;
• a brushroll;
• a brush chamber in which the brushroll is mounted;
• a brushroll window at a front of the autonomously moveable housing through which the brushroll is viewed;
• and
• a sensor cover and the plurality of other optical sensors are positioned above the brush chamber and the brushroll window.