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Modular omnidirectional bar code symbol scanning system with at least one service port for removable installation of scan module insert

  • US 6,874,690 B2
  • Filed: 05/03/2002
  • Issued: 04/05/2005
  • Est. Priority Date: 01/11/2002
  • Status: Expired due to Term
First Claim
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1. A laser scanning system for reading bar code symbols, said laser scanning system comprising:

  • a system housing having two scanning windows and two corresponding service ports integral thereto; and

    two scan module inserts, each scan module insert being removably disposed within the system housing through a corresponding service port;

    wherein each scan module insert projects an omnidirectional laser scanning pattern through one of said scanning windows; and

    wherein each said scan module contains components including;

    at least one laser diode for producing laser light;

    a rotating scanning element for redirecting laser light incident thereon to produce one or more scanning laser beams;

    an electric motor for rotating the rotating scanning element;

    at least one photodetector for detecting light incident thereon and producing an electrical signal whose amplitude is proportional to the intensity of such detected light; and

    analog signal processing circuitry for conditioning the electrical signal produced by the photodetector.

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