JPH0370941B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is designed to be carried by workers engaged in various works such as patrolling and inspecting inside specific buildings such as underground substations, buildings, underground malls, and tunnels. The present invention relates to a portable telephone and position notification device that can be used to provide accurate commands and guidance to each worker in the event of a disaster, and also to confirm the location of workers during normal times.

(Prior Art) A communication device worn by workers inside a building such as an underground substation has a communication device built into a part of a work helmet for wireless communication between workers. However, since the radio waves used for this type of wireless communication are easily blocked by concrete, it is inconvenient to make emergency calls with a disaster control center in the event of a disaster such as a fire.
In addition, since the command center cannot know the location of each worker unless the worker reports the situation, even if the worker is wearing a helmet with a built-in communication device, There was a drawback that accurate guidance commands could not be given from the control room.
In addition, such helmets are heavier than conventional helmets, making workers more fatigued.
There was also the problem of having to wear a helmet at all times even in workplaces where helmets are not required by law.

(Problems to be Solved by the Invention) The present invention solves these conventional problems, and enables communication with the command center in the event of a disaster.
It is possible to constantly notify the control room of the current location of each worker and receive accurate guidance instructions from the control room that take into account the location of each worker. It was developed for the purpose of being a portable telephone and location reporting device that can be used for communications between the control center and the command center, and will not interfere with normal operations.

(Means for Solving the Problems) The present invention provides an infrared transmitter and a command center that transmit an optical signal for position notification at a frequency individually assigned to each person and an optical signal for transmitting voice modulated by an audio signal. An infrared receiver for receiving a command light signal modulated by a command voice signal from the worker is installed in a flat transmitting and receiving part worn on the shoulder of the worker's clothes, and
The transmitting/receiving section is characterized in that a driving section including a power source and a necessary electric circuit is connected to the transmitting/receiving section by a flexible cord.

(Example) Next, the present invention will be described in detail with reference to the illustrated embodiment. Reference numeral 1 denotes a flat transmitting and receiving unit that is attached to the shoulder of the worker's clothes with adhesive tape 2 on the back side. It is preferable to use a cord with the same function connected by a flexible cord 3 to both shoulders, but one side can be omitted, or rubber pads can be sewn on the shoulders of work clothes. It may also be fixed by attaching it and inserting it into this. Further, 4 is a drive unit with a size of, for example, 8 x 13 x 2 cm, which can be stored in the chest pocket of work clothes, etc., and inside thereof is equipped with a power source 5 such as a battery and the necessary electric circuits described below. It is connected to the transmitting/receiving section 1 by a flexible cord 6. As shown in FIG. 2, the drive unit 4 includes an oscillator 7 that constantly generates an electrical signal of a frequency individually assigned to each person, a modulator 8 that modulates the electrical signal, an amplifier 9, and a demodulator 10. It is provided. On the other hand, the transmitting/receiving section 1 is provided with a microphone 11 and its amplifier 12. When a worker speaks, the voice signal is converted into an electrical signal by the microphone 11, amplified by the amplifier 12, and then sent to the drive section 4. The signal enters the modulator 8 and modulates the electrical signal of the frequency individually assigned to each person, which is oscillated by the oscillator 7. This modulated signal is further amplified by an amplifier 9, and then sent to the transmitter/receiver section 1, and is transmitted upward as an optical signal for speech transmission from an infrared transmitter 15 consisting of an infrared light emitting element 13 and its driving circuit 14. Ru. Note that since the oscillator 7 always generates a unique frequency, even when no audio signal is received from the microphone 11, a position notification optical signal of a frequency individually assigned to each person is always sent from the infrared transmitter 15. It is being sent upwards. The infrared rays used are preferably those in the wavelength range of 800 nm or more, which has excellent permeability to smoke when a fire occurs, and the filter 16 on the top of the transmitting/receiving unit 1 blocks light rays of wavelengths shorter than this, preventing fluorescent lights and sunlight. This is intended to improve the S/N ratio by preventing noise rays such as In addition, the transmitting/receiving section 1 is provided with an infrared receiver 19 consisting of an infrared receiving element 17 and an amplifier 18 on the lower surface of the filter 16, and command light transmitted from a fixed transmitter/receiver 30 installed on the ceiling of the building. Receive a signal. This command optical signal is obtained by modulating infrared rays of a specific frequency with a command audio signal from the command room, which is converted into an electrical signal by an infrared receiver 19, demodulated into an audio signal by a demodulator 10 of the drive unit 4, and is sent to the earphone. Sent to 20th.

As described above, the optical signal for position notification transmitted from the infrared transmitter 15 and the optical signal transmitted from the infrared transmitter 15 are placed on the ceiling of buildings such as underground substations where workers carrying the portable communication and location notification device of the present invention work. A fixed transmitter/receiver 30 that receives a communication optical signal and also transmits a command optical signal to the infrared receiver 19 is installed in each section of the building divided into a plurality of sections. . This fixed transmitter/receiver 30 is connected to a disaster prevention control room via an electric cable or optical fiber cable buried inside the wall of the building, and the infrared transmitter 15 constantly sends out position information for each person using an individual frequency. The optical signal is received by a fixed transmitter/receiver 30 installed in any section within the building, and the control room can constantly monitor which section the workers are located in. Furthermore, communication between a worker carrying the device of the present invention and the control room is possible via fixed transceivers 30 installed in each compartment.

Note that, as mentioned above, in the present invention, the wavelength
It is preferable to use infrared rays of 800 nm or more, but in particular use infrared rays in the wavelength range of 5 μm or more, which are less likely to be attenuated by smoke, as is clear from the graph in Figure 4, which shows the relative attenuation coefficient in various types of smoke. This will allow communication without being interfered with by smoke.
Furthermore, infrared rays have better directivity than electromagnetic waves, and have the advantage that they can also be used inside buildings, such as substations, where troubles due to electromagnetic induction are likely to occur when electromagnetic waves are used. Further, in addition to using a flat filter as shown in the figure, the filter 16 may be used in which an optical lens is formed for each infrared light emitting element 13 and infrared light receiving element 17 to achieve more efficient transmission and reception. In particular, the light emitting side uses an optical lens that diffuses the light.
The light-receiving side is preferably an optical lens that condenses light, and if a Fresnel lens is used instead of a concave-convex lens, the thickness of the lens can be reduced and the weight of the device can be reduced.

(Function) In the device configured as described above, the flat transmitter/receiver 1 is attached to the shoulder of the worker's work clothes, etc., and the drive unit 4 is connected to the transmitter/receiver 1 by a flexible cord 6. The transmitting/receiving unit 1 of the present invention is installed on the worker's shoulder, so it can be used by storing it in the chest pocket of work clothes or the like. The position notification optical signal constantly transmitted from the infrared transmitter 15 is accurately received by one of the fixed transceivers 30 installed on the ceiling of each section of the building. The current position of each worker can be individually monitored by checking what kind of optical signal is being received. Therefore, in the event that a fire or other disaster occurs inside a building, the control room can determine the optimal evacuation route by considering the current location of each worker. Appropriate commands and guidance can be issued to each worker via the fixed transceiver 30. Such command guidance is received by the infrared receiver 19 as a command optical signal modulated by a command audio signal, demodulated into an audio signal by the demodulator 10, and sent to the earphone 20. Similarly, calls from workers are modulated. Since the transmitted optical signal is transmitted from the infrared transmitter 15 to the command center via the reverse route, each worker can easily communicate with the command center while evacuating from the optimal route or detecting the situation of a disaster. It will be possible to carry out disaster prevention activities corresponding to disaster prevention activities, and it can also be used during normal times for purposes such as confirming the location of workers and giving work instructions.

(Effects of the Invention) As is clear from the above description, the present invention constantly informs the control room of the current position of each worker and provides accurate guidance from the control room taking into account the position of each worker. It allows for receiving commands as well as stable communication with the command center.In particular, since it uses infrared rays as a means of communication, it does not cause complicated reflections like radio waves, and can notify the location. Not only can communication be carried out reliably, but also there will be no trouble caused by electromagnetic induction, and even in the event of a disaster, communication with the command center can be carried out with less noise. Furthermore, since the device of the present invention is used by attaching the flat transmitting/receiving section to the shoulder of clothing, it does not cause any hindrance to daily work. Furthermore, by connecting the control room and the fixed transceiver with an optical fiber cable, there is no need to provide the fixed transceiver with an electronic device for converting optical signals and electrical signals, and the structure of the building can be reduced. It is easy to make and can withstand high temperatures.

Therefore, the present invention greatly contributes to the development of industry as a portable telephone and location notification device essential for ensuring the safety of workers in underground substations and the like.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view showing an embodiment of the present invention, Fig. 2 is a block diagram showing its circuit configuration, Fig. 3 is a perspective view illustrating the state of use, and Fig. 4 is a It is a graph showing attenuation characteristics of light. 1: Transmission/reception unit, 4: Drive unit, 5: Power supply, 6: Cord, 15: Infrared transmitter, 19: Infrared receiver.

Claims (1)

[Claims] 1. An infrared transmitter 15 that transmits a position notification optical signal of a frequency individually assigned to each person and an optical transmission signal modulated by an audio signal, and a command optical signal modulated by a command audio signal from the command room. An infrared receiver 19 for receiving the information is provided in a flat plate-shaped transmitting/receiving section 1 worn on the shoulder of the worker's clothes, and the transmitting/receiving section 1 is equipped with a driving section 4 equipped with a power source 5 and a necessary electric circuit. A portable telephone communication and location notification device characterized in that it is connected by a flexible cord 6.