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Robot cleaner system and a method for returning to external recharging apparatus

  • US 7,489,985 B2
  • Filed: 03/09/2005
  • Issued: 02/10/2009
  • Est. Priority Date: 10/27/2004
  • Status: Expired due to Fees
First Claim
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1. A robot cleaner system comprising:

  • a first transmitter generating first infrared signals, the first transmitter being associated with an external apparatus;

    a second transmitter generating second infrared signals, the second transmitter being associated with the external apparatus, the second infrared signals having less strength than the first infrared signals and having a different code than the first infrared signals, wherein the codes of the infrared signals differ in wave size or shape;

    a receiving part simultaneously receiving the first and second infrared signals, the receiving part being associated with a robot cleaner; and

    a control part for controlling a movement of the robot cleaner based upon the first and second infrared signals so that the robot cleaner is moved to a desired position with respect to the external apparatus.

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