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Work helmet having transmitter-receiver for light signal

  • US 4,648,131 A
  • Filed: 10/04/1984
  • Issued: 03/03/1987
  • Est. Priority Date: 10/07/1983
  • Status: Expired due to Term
First Claim
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1. A work helmet for effecting an intercommunication among workers as well as between a central control room and workers, comprising:

  • a cap-like main body comprising a hard material and having at least one hole provided near a top portion thereof;

    at least one means for forming at least one cavity having a wall portion and a bottom portion provided in alignment with said at least one hole of said cap-like main body;

    at least one lens provided in said hole;

    a light-receiving means provided on said bottom portion, and a demodulating means for demodulating said light signal received by said light receiving means and audibly reproducing the demodulated incoming speech signal; and

    transmitting means for transmitting a signal, comprising a helmet identifying signal generating means having an oscillator for generating a carrier, converting means for converting voice into an electric signal, said converting means including a microphone, modulating means for modulating said carrier with said electric signal to generate an outgoing signal, and at least one light-emitting means for emitting an outgoing light signal in response to said outgoing signal through said at least one lens, said light-emitting means being provided on said bottom portion.

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