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Admission control system having a transponder actuated by an inquiry signal

  • US 4,822,990 A
  • Filed: 11/20/1986
  • Issued: 04/18/1989
  • Est. Priority Date: 11/29/1985
  • Status: Expired due to Term
First Claim
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1. An admission control system for administering a controllable admission of a selected person to a place provided with at least one primary entrance to the place and subdivided into at least two sections, each section being provided with at least one secondary entrance to the section, the admission control system comprising:

  • portable means including a transponder to be carried by the person, for generating an identification code assigned to the portable means, in response to a reception of an inquiry radio wave which actuates the transponder;

    primary admission control means to be located at the primary entrance, for granting an admission to the person, including;

    first radio wave transmitter means for transmitting the inquiry radio wave,first receiver means for receiving the identification code from the portable means when said identificatio code is generated by said portable means in response to said inquiry radio wave generated by said first radio wave transmitter means,first memory means for memorizing admissible identification code, andfirst gate means for granting admission to the person only when the identification code from the portable means carried by the person coincides with one of the admissible identification codes memorized in the first memory means;

    secondary admission control means to be located at the secondary entrances for detecting a passage of the person, including;

    second radio wave transmitter means for transmitting the inquiry radio wave,second receiver means for receiving the identification code from the portable means when said identification code is generated by said portable means in response to the inquiry radio wave generated by said second radio wave transmitter,second gate means for detecting the passage of the person, andsecond memory means for recording the identification code received by the second receiving means and the passage detected by the second gate means; and

    means for determining the location of the person within the place based at least in part on the identification code recorded in the second memory means.

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