Abstract:
A radio system capable of multiplexing communication includes a main radio, a master radio, a sub-radio, and a connecting unit having a PTT switch built therein. The enforcement of tactical operations and maintaining a dominant position in terms of combat effectiveness can be achieved by performing swift and smooth communication using master and sub-radios.

Description:
BACKGROUND 
     The present invention relates generally to a radio communication system enabling multiplex communication and, more particularly, to a radio communication system enabling multiplex communication for allowing multiple members who are located within a certain distance to freely engage in bidirectional voice radio communication. 
     In a military or police operation, which is generally carried out by a small team comprised of five to seven persons, each member has a small radio set for short range communication between individual members, which is operated as follows: 
     A radio set for short range communication is mainly classified into a main radio set serving as a master and a subsidiary radio set serving as a slave. 
     However, in the conventional art, commands have been transferred in a way that the main radio set is held only by those who are squad leader level or higher and these persons forward the commands to other team members who do not possess the main radio. 
     Accordingly, the commands are not smoothly transferred to the team members due to a restriction on voice command transfer, and thus a problem of weakened tactical operations is expected. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention has been made keeping in mind the above problems occurring in the conventional art, and an object of the present invention is to provide a radio communication system enabling multiplex communication in order to strengthen tactical operations and ensure superior combat effectiveness by making fast and streamlined communication possible, by allowing individual members to possess either: a main radio set performing long range radio communication; a master radio set connected to the main radio set; or a subsidiary radio set performing short range radio communication with the master radio set, with the master radio set functioning so as to output every voice input by the subsidiary radio sets and all of the other subsidiary radio sets, as well as the master radio set functioning so as to output commands forwarded from any higher level radio set than the master radio set. 
     Another object of the present invention is to provide a radio communication system enabling multiplex communication for the purpose of allowing an establishment of another communication network by which, when any subsidiary radio goes beyond a coverage area available for communication with a master radio set and loses radio communication, one of the subsidiary radio sets can be changed to function as a master; that is a “slave master radio set” and the remaining slave radio sets can engage in radio communication with the slave master radio set. 
     A further object of the present invention is to provide a radio communication system enabling multiplex communication for allowing notification of members that a master radio set and subsidiary radio sets have gone beyond or come into a radio communication coverage area by controlling a notification unit and displaying that a slave master radio set has been established, via a display unit. 
     In order to accomplish the above objects, an aspect of the present invention provides A radio communication system enabling multiplex communication, comprising: a master radio set including: a main radio set carrying out long-range radio communication, a master communication unit carrying out wired communication for allowing voice signals to be transmitted/received to/from the main radio set, a master transmitter to which voice signals are input, a master receiver outputting voice signals, and a master controller for controlling the master communication according to an on or off state of a PTT switch; a plurality of subsidiary radio sets, each including: a subsidiary communication unit carrying out short-range radio communication for allowing voice signals to be transmitted/received to/from the master communication unit, a subsidiary transmitter to which voice signals are input, a subsidiary receiver outputting voice signals, and a subsidiary controller carrying out a control function in such a way that, when the subsidiary radio sets go outside a coverage area available for communication with the master radio set and lose radio communication, any one of the subsidiary radio sets having radio communication disconnected can be changed to a slave master radio set; and a connection unit connecting the main radio set and the master radio set to each other to transmit and receive voice signals, and provided with a PTT switch to carry out a control function so as to transmit and receive voice signals in a PTT method. 
     Each of the master radio set and subsidiary radio sets further include a volume-up switch and a volume-down switch to adjust volume of the master receiver and the subsidiary receivers, and a mode switch for changing predetermined communication modes, the subsidiary controller carrying out the control function in such a way that, when the subsidiary radio sets go beyond the coverage area available for communication with the master radio set and lose radio communication, and input signals of the mode switch and the volume-up switch are applied from any one of the subsidiary radio sets with radio communication disconnected, the subsidiary radio set is changed to the slave master radio set, when input signals of the mode switch and the volume-up switch are applied from remaining subsidiary radio sets with radio communication disconnected, other than the subsidiary radio set changed to the slave master radio set, the subsidiary communication units of the subsidiary radio sets are controlled and the subsidiary radio sets are changed to slave subsidiary radio sets that are able to transmit/receive voice signals to/from the slave master radio set, and when input signals of the mode switch are applied from the slave master radio set and the slave subsidiary radio sets, radio communication between the slave master radio set and the slave subsidiary radio sets is disconnected and made with the master radio set. 
     The subsidiary controller carries out the control function in such a way that, when the subsidiary radio sets go beyond the coverage area available for communication with the master radio set and lose radio communication, a sound indicating that radio communication has been disconnected is output to receivers of the subsidiary radio sets, when any one of the subsidiary radio sets is changed to the slave master radio set, a sound indicating the change is output to a receiver of the subsidiary radio set, and when radio communication between the slave master radio set and the slave subsidiary radio sets is disconnected, a sound indicating the disconnection is output to each of the receivers of the slave master radio set and the slave subsidiary radio sets. 
     The subsidiary radio sets further include respective display units comprising LED devices, and the subsidiary controller carries out the control function in such a way that, when any one of the subsidiary radio sets is changed to the slave master radio set, a red light is displayed on the display unit of the subsidiary radio set, and when the subsidiary radio sets are changed to the slave subsidiary radio sets, a green light is displayed on the display units of the subsidiary radio sets. 
     When the PTT switch is turned off, the master controller controls the master communication unit so that voice signals input into the subsidiary transmitters of the main radio set and the subsidiary radio sets are output to the master receiver, and voice signals input into the main radio set and the master transmitter are transmitted to the subsidiary communication units. 
     When the PTT switch is turned on, the master controller controls the master communication unit so that the only voice signals input into the main radio set are output to the master receiver, and voice signals input into the main radio set and the master transmitter are not transmitted to the subsidiary communication units 
     As described above, the present invention provides a radio communication system enabling multiplex communication in which individual members are allowed to possess either a main radio set performing long range radio communication; a master radio set connected to the main radio set; or a subsidiary radio set performing short range radio communication with the master radio set, the master radio set being configured to output all of audio input from the subsidiary radio sets, and all of the subsidiary radio sets as well as the master radio set are designed to output voices forwarded from any higher level radio set than the master radio set, whereby tactical operations can be strengthened and superior combat effectiveness can be guaranteed, by making fast and streamlined communication possible. 
     When any subsidiary radio set goes beyond a coverage area available for communication with a master radio set and loses radio communication, the radio communication system enabling multiplex communication in accordance with the present invention can accomplish smooth communication between subsidiary radio sets deviating out of the communication coverage area and a master radio set, by establishing another communication network in which one of the subsidiary radio sets can be changed to a master, i.e. a slave master radio set and the remaining slave radio sets can make radio communication with the slave master radio set. 
     In addition, the radio communication system enabling multiplex communication in accordance with the present invention can provide fast communication capabilities for creating efficient tactical operations and improving combat effectiveness by controlling a notification unit to notify members when any slave radio set goes beyond or comes into a radio communication coverage area between a master radio set and subsidiary radio sets and displaying on a display unit that it has become a slave master radio set. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  a schematic diagram illustrating a radio communication system enabling multiplex communication in accordance with an embodiment of the present invention; 
         FIG. 2  is a block diagram illustrating a radio communication system enabling multiplex communication in accordance with an embodiment of the present invention; 
         FIG. 3  is a drawing illustrating a use example of a radio communication system enabling multiplex communication in accordance with an embodiment of the present invention; 
         FIG. 4  is a drawing illustrating another use example of a radio communication system enabling multiplex communication in accordance with an embodiment of the present invention; 
         FIG. 5  is a drawing illustrating when communication of a radio communication system enabling multiplex communication in accordance with an embodiment of the present invention has been disconnected; 
         FIG. 6  is a drawing illustrating a state when a master radio set or a subsidiary radio set is separated from a military helmet; 
         FIG. 7  is a drawing illustrating a state when a master radio set or subsidiary radio set is mounted on a military helmet; 
         FIG. 8  is a drawing illustrating a condition of the backside of a common military helmet; and 
         FIG. 9(A)  and  FIG. 9(B)  are partially magnified photos of a liner and inner side of a military helmet. 
     
    
    
     
       
         
               
             
               
               
             
               
             
               
               
             
               
             
               
               
             
               
             
           
               
                   
               
               
                 &lt;Description of the Reference Numerals in the Drawings&gt; 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 1: Liner  
                 2: Helmet Body 
               
               
                 4: Fixing Band 
                 5: Bending Flat Spring Support Plate 
               
               
                 6: Snap Button 
                 7: Mounting Hook 
               
               
                 8: Snap Button Slot 
                 9: Fastening Piece 
               
               
                 100: Main Radio Set 
                 200: Master Radio Set 
               
               
                 210: Master Communication Unit 
                 220: Master Transmitter 
               
               
                 230: Master Receiver 
                 240: Master Controller 
               
             
          
           
               
                 250, 350: Volume-Up Switch 
               
               
                 260, 360: Volume-Down Switch 
               
             
          
           
               
                 270, 370: Mode Switch 
                 300: Subsidiary Radio Set 
               
             
          
           
               
                 310: Subsidiary Communication Unit 
               
               
                 320: Subsidiary Transmitter 
               
             
          
           
               
                 330: Subsidiary Receiver 
                 340: Subsidiary Controller 
               
               
                 380: Display Unit 
                 400: Connecting Unit 
               
               
                 410: PTT Switch 
                 500: Main Communication Network 
               
             
          
           
               
                 510: The Primary Communication Network 
               
               
                 520: The Secondary Communication Network 
               
               
                 600: Slave Master Radio Set 
               
               
                 610: Slave Subsidiary Radio Set 
               
               
                   
               
             
          
         
       
     
     DETAILED DESCRIPTION OF THE INVENTION 
     Benefits, features and methods of achieving the same of the present invention will be clarified with reference to embodiments to be described in detail below with reference to the attached drawings. However, it should be understood that those embodiments are not intended to limit the present invention to specific disclosure forms, but they will be realized as various different forms, provided for complementing embodiments of the present invention and fully informing those with common knowledge in the art of the present invention of a category of the present invention and defined by scopes of claims of the present invention. Sizes and relative sizes of layers and areas in drawings may be exaggerated for clear explanation. Any and all of same reference symbols throughout the specifications refer to the same elements. 
     A radio communication system enabling multiplex communication according to the present invention will be described with reference to the accompanying drawings. 
       FIG. 1  is a schematic view illustrating a radio communication system enabling multiplex communication in accordance with an embodiment of the present invention.  FIG. 2  is a block diagram illustrating a radio communication system enabling multiplex communication in accordance with an embodiment of the present invention. 
     Referring to  FIG. 1  and  FIG. 2 , the radio communication system enabling multiplex communication in accordance with an embodiment of the present invention, may include a main radio set  100 , a master radio set  200 , a subsidiary radio set  300  and a connection unit  400 . 
     The main radio set  100  carries out long range radio communication. 
     For example, a main radio set  100  is used for squad leaders to transmit/receive voice communication with each other through the main radio set  100 , or a platoon leader and a squad leader to individually transmit/receive voice communication with each other through the main radio set  100 . 
     A master radio set  200  may include a master communication unit  210 , a master transmitter  220 , a master receiver  230  and a master controller  240 . 
     A master communication unit  210  carries out wired communication for transmitting/receiving voice signals to/from a main radio set  100 . 
     In this case, the main radio set  100  and the master radio set  200  are connected to the connection unit  400 . 
     The connection unit  400  connects the main radio set  100  and the master radio set  200  for transmitting/receiving voice signals each other, and a PTT switch  410  is configured so that voice signals can be transmitted and received with a PTT (Push to Talk) method. 
     The voice signals are input into the master transmitter  220 . 
     The master receiver  230  outputs the voice signals. 
     When the voice signals are input and output into the master transmitter  220  and the master receiver  230 , analog voice signals are converted into digital voice signals by a voice codec (not shown) that converts between analog voice signals and digital voice signals and the converted digital voice signals are transmitted by the master communication unit  210  to other radio sets. 
     Moreover, digital voice signals received by the master communication unit  210  are converted into analog voice signals by the voice codec and output to the master receiver  230 . 
     In addition, a subsidiary communication unit  310 , a subsidiary transmitter  320  and a subsidiary receiver  330  to be described below also operate as described above and detailed description is omitted as they are all known technologies. 
     The master transmitter  220  and the subsidiary transmitter  320  may include but are not limited to microphones, etc. into which voice signals can be input, and the master receiver  230  and the subsidiary receiver  330  may include but are not limited to speakers, etc. from which voice signals can be output. 
     The master controller  240  controls the master communication unit  210  according to on or off state of the PTT switch  410 . 
     The master controller  240  also controls the master communication unit  210  so that it can transmit voice signals input into the master transmitter  220  to the main radio set  100  and the subsidiary radio set  300  to be described below, and receives voice signals transmitted from the main radio set  100  and the subsidiary radio set  300 . 
     The master controller  240  is described below in detail. 
     When the PTT switch  410  turns off, the master controller  240  controls the master communication unit  210  so that voice signals input into the subsidiary transmitter  320  of the main radio set  100  and multiple subsidiary radio sets  300  should be output to the master receiver  230 , and voice signals input into the main radio set  100  and master transmitter  220  should be transmitted to the subsidiary communication unit  310 . 
     When the PTT switch  410  turns off, the master controller  240  controls the master communication unit  210  so that voice signals only input into the main radio set  100  should be output to the master receiver  230  and voice signals input into the main radio set  100  and master transmitter  220  should not be transmitted to the subsidiary communication unit  310 . 
       FIG. 3  is a drawing illustrating a use example of a radio communication system enabling multiplex communication in accordance with an embodiment of the present invention. 
     For example,  FIG. 3  and [Table 1] below illustrates operation relation of the PTT switch  410  configured on the connection unit  400  for connecting the main radio set  100  and the master radio set  200  held by a squad leader. 
     
       
         
               
               
               
               
             
               
               
               
               
               
               
               
             
           
               
                 TABLE 1 
               
             
             
               
                   
               
               
                 Status 
                   
                   
                   
               
               
                 (PTT 
               
               
                 Switch 
               
               
                 configured 
               
               
                 on the 
                 Squad Leader (Main + 
               
               
                 Connection 
                 Master) 
                 Squad Members 
                 Platoon Leader (Main) 
               
             
          
           
               
                 Unit 400) 
                 Transmitter 
                 Receiver 
                 Transmitter 
                 Receiver 
                 Transmitter 
                 Receiver 
               
               
                   
               
               
                 PTT Switch 
                 ON 
                 Voice of 
                 ON 
                 Voice of 
                 MUTE 
                 Voice of Squad 
               
               
                 Off 
                   
                 Squad 
                   
                 Platoon 
                   
                 Leader + Voice 
               
               
                   
                   
                 Leader + 
                   
                 Leader + 
                   
                 of Squad 
               
               
                   
                   
                 Voice of 
                   
                 Voice of 
                   
                 Members 
               
               
                   
                   
                 Squad 
                   
                 Squad Leader + 
               
               
                   
                   
                 Members 
                   
                 Voice of 
               
               
                   
                   
                   
                   
                 Squad Members 
               
               
                 PTT Switch 
                 ON 
                 Voice of 
                 MUTE 
                 MUTE 
                 MUTE 
                 Voice of Squad 
               
               
                 On 
                   
                 Platoon 
                   
                   
                   
                 Leader 
               
               
                   
                   
                 Leader 
               
               
                   
               
             
          
         
       
     
     When a platoon leader has a main radio set  100   a  and a squad leader has a combination of a main radio set  100   b  that can communicate with the main radio set  100  of the platoon leader and the master radio set  200 , and squad members have the subsidiary radio sets  300  that can communicate with the master radio set  200 , when the squad leader turns on the PTT switch  410 , the squad members can hear the platoon leader and the squad leader voices and the voices of each squad member, and the squad leader can hear voices of all squad members transmitted from the multiple subsidiary radio sets  300 . Furthermore, the platoon leader can also hear the voices of the squad leader and the squad members. 
     At this moment, when the squad leader turns on the PTT switch  410 , it is preferable that voices should be transmitted to the main radio set  100  of the platoon leader and squad leader only, and when the platoon leader wants to transmit voices to the squad leader, voices should be transmitted to the master radio set  200  of the squad leader only by turning on the PTT switch  410  of a main terminal held by the platoon leader. It may represent a status wherein the squad leader and platoon leader cannot hear the voices of the squad members, and the squad members cannot hear voices of the platoon leader and the squad leader, while the squad members may hear voices of the platoon leader and the squad leader, when a communication mode is changed. 
     Moreover, it is preferable that the predetermined communication mode can be changed by a mode switch to be described below and various types of communication can be achieved according to change to the predetermined communication mode, but it should not be limited to such an example. 
       FIG. 4  is a drawing illustrating another use example of a radio communication system enabling multiplex communication in accordance with an embodiment of the present invention. 
     As illustrated in  FIG. 4 , when squad leaders of the first and the second squads possess the main radio set  100 , each squad may transmit or receive voice signals. 
     Accordingly, fast and smooth communication can be made between the platoon leader, the squad leader and squad members, or between squads through a radio communication system enabling multiplex communication according to the present invention in order to strengthen tactical operations and ensure superior combat effectiveness. 
     In addition, the master radio set  200  may additionally include a volume-up switch  250  and a volume-down switch  260  for adjusting volume of the master receiver  230 , and a mode switch  270  for changing a predetermined communication mode. 
     The subsidiary radio set  300  may include the subsidiary communication unit  310 , the subsidiary transmitter  320 , the subsidiary receiver  330  and a subsidiary controller  340 . 
     The subsidiary communication unit  310  carries out short range radio communication for allowing the transmission/reception of voice signals to/from the master communication unit  210 . 
     The voice signals are input into the subsidiary transmitter  320 . 
     The subsidiary receiver  330  outputs the voice signals. 
     A subsidiary controller  340  carries out a control function by which, when any one of the subsidiary radio sets  300  goes beyond a coverage area available for radio communication with the master radio set  200  and loses radio communication, one of the subsidiary radio sets  300  deviating out of the radio communication coverage area can be changed to a master, i.e. a slave master radio set  600 . 
     In addition, the subsidiary radio set  300  may additionally include a volume-up switch  350  and a volume-down switch  360  for adjusting volume of the master receiver  330 , and a mode switch  370  for changing a predetermined communication mode. 
     When a subsidiary radio set  300  has lost communication with the master radio set  200 , the subsidiary radio set  300  is changed to a slave master radio set  600 , as described below in detail. 
     At first, the subsidiary controller  340  carries out a control function in such a way that, when any one of the subsidiary radio sets  300  goes beyond a coverage area available for radio communication with the master radio set  200  and loses radio communication, inputting input signals of the mode switch  370  and the volume-up switch  350  into any one of the subsidiary radio sets  300  deviating out of the radio communication coverage area must be controlled to induce the subsidiary radio set  300  to be changed to a slave master radio set  600 . 
     In this regard, when input signals of the mode switch  370  and the volume-down switch  360  are input into any one of the remaining subsidiary radio sets  300  away from the radio communication coverage area, except the subsidiary radio set  300  which has been changed to the slave master radio set  600 , the subsidiary controller  340  controls a subsidiary communication unit  310  of the subsidiary radio set  300  so that the subsidiary radio set  300  should be changed to a slave subsidiary radio set  610  available for sending/receiving voice signals to/from the slave master radio set  600 . 
     In addition, the subsidiary controller  340  carries out a control function by which, when input signals of a mode switch are input from the slave master radio set  600  and a slave subsidiary radio set  610 , radio communication between the slave master radio set  600  and the slave subsidiary radio set  610  should be severed and re-established with the master radio set  200 . 
       FIG. 5  is a drawing illustrating when communication of a radio communication system enabling multiplex communication in accordance with an embodiment of the present invention has been disconnected. 
     For example, it is assumed that a master radio set  200  and six subsidiary radio sets  300  are making radio communication through a main communication network ( 500 ). 
     At this moment, when a subsidiary radio set #4  300   d , a subsidiary radio set #5  300   e  and a subsidiary radio set #6  300   f  out of multiple subsidiary radio sets  300  go beyond a coverage area available for communication with the master radio set  200 , the master radio set  200 , the subsidiary radio set #4  300   d , the subsidiary radio set #5  300   e  and the subsidiary radio set #6  300   f  lose communication. 
     When a mode switch and a volume-up switch on the subsidiary radio set #4  300   d  are pressed, the subsidiary radio set #4  300   d  is changed to a slave master radio set  600 . 
     If the mode switch  370  and the volume-down switch  360  are pressed thereon, each of the subsidiary radio set #5  300   e  and the subsidiary radio set #6  300   f  is changed to a slave subsidiary radio set  610  and starts radio communication with the slave master radio set  600 . 
     Accordingly, the main communication network  500  is divided into the first communication network  510  and the second communication network  520 , the master radio set  200 , a subsidiary radio set #1  300   a , a subsidiary radio set #2  300   c  and a subsidiary radio set #3  300   c  continue to use the first communication network  510  that is the main communication network  500 . 
     Then, the slave master radio set  600  and the slave subsidiary radio sets  610  establish and use the second communication network  520 . 
     When the slave master radio set  600  and the slave subsidiary radio set  610  come within a coverage area available for communication with the master radio set  200  and have the mode switch  370  pressed, the second communication network  520  is disconnected and they can join the main communication network  500  and resume communication with the master radio set  200 . 
     Consequently, it is possible to achieve smooth communication among the subsidiary radio sets  300  out of the communication coverage area from the master radio set  200 , to conduct more efficient training exercises and establish effective tactical operations through fast response to the situation. 
     On the other hand, the subsidiary controller  340  carries out a control function by which when a subsidiary radio set  300  goes beyond a coverage area for radio communication and loses radio communication, a disconnection tone is released to a subsidiary receiver  330  of the subsidiary radio set  300  with radio communication disconnected. An example may include but is not limited to releasing a sound of 500 Hz 50 msec twice. 
     In addition, the subsidiary controller  340  carries out a control function by which when a subsidiary radio set  300  is changed to a slave master radio set  600 , an establishment tone should be released to a subsidiary receiver  330  of the subsidiary radio set  300 . An example may include but is not limited to a one-time release of a sound of 500 Hz 50 msec. 
     In addition, the subsidiary controller  340  carries out a control function by which, when radio communication of the slave master radio set  600  and the slave subsidiary radio set  610  has been released, a releasing tone should be released to receivers of the slave master radio set  600  and the slave subsidiary radio set  610 . An example may include but is not limited to releasing a sound of 500 Hz 200 msec. 
     In addition, the subsidiary controller  340  is able to carry out a control function by which, when the slave master radio set  600  and slave subsidiary radio set  610  are making communication through the second communication network  520 , a communication tone should be released to receivers of the slave master radio set  600  and the slave subsidiary radio set  610 , and a disconnection tone should be released to a master receiver  230  of the master radio set  200  when the master controller  240  of the master radio set  200  has radio communication disconnected with the subsidiary radio set  300 . 
     A subsidiary radio set  300  may additionally include a display unit  380  comprising LED devices. 
     The subsidiary controller  340  also carries out a control function by which when a subsidiary radio set  300  is changed to a slave master radio set  600 , a red light should be displayed on a display unit  380  of the subsidiary radio set  300 . An example may include but is not limited to illuminating a red light for 200 msec every second repeatedly. 
     The subsidiary controller  340  also carries out a control function by which when a subsidiary radio set  300  is changed to a slave master radio set  600 , a green light should be displayed on a display unit  380  of the subsidiary radio set  300 . An example may include but is not limited to illuminating a green light for 200 msec every second repeatedly. 
     The subsidiary controller  340  may also carry out a control function by which when normal radio communication becomes available, a subsidiary controller  340  should display a green light on a display unit of the subsidiary radio set  300 , or the subsidiary controller  340  should display a red light on the display unit  380 , when radio communication is not available. 
     In other words, as it is possible for squad members to quickly identify and respond to the availability of communication via an alarm unit and a display unit  380 , it is therefore possible to establish efficient tactical operations and improve combat effectiveness. 
     It is preferable for the master radio set  200  and the subsidiary radio set  300  as described above to be small sized so as to be attached and held on a military helmet worn to protect heads of soldiers, a night vision system, or other personal military supplies. 
     Next, an embodiment by which a master radio set  200  or a subsidiary radio set  300  is mounted on a military helmet is described below. 
     Although only a method of mounting a master radio set  200  or a subsidiary radio set  300  on a military helmet is explained here, it does not limit application to a military helmet, and a master radio set  200  or a subsidiary radio set  300  can be attached and held on a safety helmet, a sports helmet or a motor bike helmet, etc. found throughout various industries. 
     A radio communication system enabling multiplex communication according to the present invention may additionally include a mounting device for a military helmet. 
       FIG. 6  is a drawing illustrating a state when a master radio set or a subsidiary radio set is separated from a military helmet, and  FIG. 7  is a drawing illustrating a state when a master radio set or subsidiary radio set is mounted on a military helmet. 
     Referring to  FIG. 6  and  FIG. 7 , a military helmet comprises an inner head fastening band, a liner  1  and a helmet body  2  in which the liner  1  is fixed. 
     A mounting apparatus for a military helmet comprises a circular fixing band  4  to be inserted between the helmet body  2  and the liner  1 ; and a bending flat spring base plate  5  connected under the fixing band and having a snapping property to be protruded outside the helmet body  2 . 
     A snap button  6  and a mounting hook  7  are attached on both ends of the circular fixing band  4 . 
     The snap button  6  has a structure for being combined or separated in a snap button slot  8  formed inside the helmet body  2 . 
     The mounting hook  7  has also a structure for being combined or separated in a fastening piece  9  attached to the liner. 
     At this point, as the circular fixing band  4  is formed in a shape of a round band to be fixed on a round area of the helmet body  2  and has a same curve with the helmet body when it is fixed to the liner  1  within the helmet body, such that a wearer does not feel any inconvenience. 
     And, as the bending flat spring base plate  5  to be connected in a suspension support method at the circular fixing band  4  has a shape of a snapping flat spring, the bending flat spring base plate  5  solidly compresses and securely supports the wearer&#39;s personal supplies with no worry about loss during carriage. 
     On the other hand,  FIG. 8  is a drawing illustrating a condition of the backside of a common military helmet, and  FIG. 9(A)  and  FIG. 9(B)  are partially magnified photos of a liner and inner side of a military helmet. 
     Referring to  FIG. 8  and  FIG. 9 , A liner  1  is equipped with a fastening piece  9  in which a mounting hook  7  on one end of the circular fixing band  4  is hooked when it is inserted and mounted between the helmet body  2  and the liner as illustrated  FIG. 2 . 
     The helmet body  2  is equipped with a snap button slot in which the snap button on the other end of the circular fixing band  4  is hooked. 
     In other words, the fastening pieces  9  and snap button slots can be installed on several points of a military helmet for allowing attachment of several mounting devices on the military helmet if required. 
     As described above, as a mounting apparatus for a military helmet allows attachment of military supplies such as the main radio set  200 , the subsidiary radio set  300 , a night vision system, etc. on the existing military helmet, depending on necessity without a particular modification for performing missions, it provides easy management of personal supplies, convenient carriage and wearing a helmet without any obstruction in performing missions. 
     Those who have common knowledge of a technical area to which the present invention belongs can understand that the present invention may be implemented to another specific pattern without alteration of its technical sprit or necessary features. Thus, it should be understood that the embodiments described above are simply examples for all aspects and do not mean any restriction. A scope of the present invention is indicated in the accompanying claims to be described below, and it should be interpreted that all of modifications or transformed patterns derived from meaning and scope of claims, and their equivalent concepts are included in a scope of the present invention.