Work helmet having transmitter-receiver for light signal
First Claim
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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Accused Products
Abstract
A work helmet for effecting an intercommunication between workers as well as between a central control room and respective workers, especially used for informing each workers of guide information adequate for emergency escape when a disaster occurs is disclosed. To this end, the work helmet includes a light-receiving element for receiving a light signal modulated with the guide information, an earphone for reproducing audibly the guide information, a light emitting element for emitting an outgoing light signal modulated with a speech signal supplied from a microphone, and an oscillator for generating a carrier having a frequency specific to the helmet, on which carrier said speech signal is modulated, so that the outgoing light signal is always modulated by the carrier serving as a helmet identifying signal by means of which the central control room can recognize and identify the worker wearing the helmet.
75 Citations
10 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification