Lawn care robot

  • US 8,634,960 B2
  • Filed: 03/19/2007
  • Issued: 01/21/2014
  • Est. Priority Date: 03/17/2006
  • Status: Active Grant
First Claim
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1. A robot lawnmower swath edge detector system comprising:

  • a controller carried by a body of a robot; and

    a grass length sensor carried by the body of the robot and in communication with the controller, the grass length sensor comprising;

    a sensor housing defining a cavity and a cavity opening directly downward configured to allow grass entry into the cavity while inhibiting direct sunlight into the cavity;

    an emitter carried by the housing in the cavity and configured to emit an emission across the cavity opening; and

    a receiver carried by the housing and configured to receive a grass-reflected emission, the receiver positioned in the cavity in a position where the housing blocks direct sunlight and the receiver positioned in the cavity on substantially the same side of the housing as the emitter in a location relative to the emitter such that the receiver receives emissions reflected from grass penetrating into the cavity;

    wherein the controller compares outputs from multiple ones of the grass length sensors to determine a swath edge location.

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