Guidance system for self-advancing vehicle

  • US 5,622,236 A
  • Filed: 05/22/1995
  • Issued: 04/22/1997
  • Est. Priority Date: 10/30/1992
  • Status: Expired due to Fees
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First Claim
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1. A guidance system for a self-advancing vehicle comprisingA. a guidance line on a surface over which the vehicle is to pass wherein the guidance line comprises a luminous material that emits light of a first wavelength when excited by light of a second wavelength from a light emitter means wherein the guidance line is drawn onto the surface using a composition selected from the group consisting of the luminous material dissolved or dispersed in a solvent and the luminous material dissolved or dispersed in a coating composition;

  • andB. at least one photosensor that is oriented to pass over the guidance line, the photosensor comprising the combination of(1) the light emitter oriented to beam the light of the second wavelength onto the guidance line and working in cooperation with(2) a light receiver oriented to detect the light of the first wavelength emitted from the guidance line when the light of the second wavelength is beamed onto the guidance line wherein the light receiver generates a first signal proportional to the amount of first wavelength light being received;

    C. a control unit means for receiving the signal from the light receiver and, in response to the first signal, sending a second signal toD. a steering means on the vehicle such that the second signal causes the steering means to orient the vehicle in such a mariner as to maintain the photosensor over the guidance line and thereby cause the vehicle to follow the guidance line as it advances.

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