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Luminescent compound for controlling traveling and method for controlling traveling using the same

  • US 6,203,725 B1
  • Filed: 07/18/1997
  • Issued: 03/20/2001
  • Est. Priority Date: 07/24/1996
  • Status: Expired due to Fees
First Claim
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1. An optically controlled traveling system, a source of light and a traveling vehicle wherein the system comprises a film on a surface and the traveling vehicle is provided with a detector which controls the direction of travel of the traveling vehicle by detecting emitted light from the film which originates from the source of light wherein the film comprises a luminescent compound which has a minimum luminescent wavelength end (A nm) and an irradiation light source which emits a light having a maximum irradiation wavelength end (B nm), wherein the minimum luminescent wavelength end A is defined as a wavelength which has a strength which is one-twentieth of the maximum luminescence energy strength, the maximum irradiation wavelength end B is defined as a wavelength which has a strength which is one-fifth of the maximum irradiation light energy strength and the difference between A and B satisfies the following formula (1):

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