Remote optically readable system and method
Chromatic ranging method and apparatus for reading optically readable information over a substantial range of distances Patent #: 5468950
ApplicationNo. 608999 filed on 06/30/2000
US Classes:235/472.01, Hand-held (e.g., portable)235/454, Optical235/469Color coded
ExaminersPrimary: Pitts, Harold I.
Attorney, Agent or Firm
Foreign Patent References
International ClassG06K 007/10
AbstractAn optical system, such as a bar code scanner, illuminates an image with a multi-wavelength device. Under a first embodiment, a tunable laser is optically coupled with a prism or other wavelength separation device. As the laser beam wavelength varies, the transmission path through the prism changes, resulting in a scanning of the beam across an image. A photodetector captures light reflected from the image and sends it to a microprocessor for decoding. Under another embodiment, a broad band light source transmits light through a prism, thus shining a "rainbow" on the image. A spectrometer measures reflected light as a function of wavelength and sends the resultant signal to a microprocessor for decoding. Neither embodiment relies on moving parts to scan the image.