hereinafter , a safety helmet and a method of handling an accident using the safety helmet according to exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings . fig1 is an exploded perspective view of a safety helmet according to an exemplary embodiment of the present invention . fig2 is a view showing a coupled state of fig1 . fig3 is a sectional view of fig1 . referring to fig1 to 3 , the safety helmet according to an exemplary embodiment of the present invention includes a safety helmet body 100 formed of a resin , for providing a semispherical space to accommodate the head of a human body , a lighting part 400 provided at a front side of the safety helmet body 100 , for accommodating a substrate 410 having an led 420 to provide lighting on a front side of a helmet wearer , a metallic heat radiation part 200 extending from a front side to a rear side of the safety helmet body 100 along the center of an upper portion of the safety helmet body 100 , for radiating heat while contacting a rear surface of the substrate 410 , a communication unit 500 accommodated in an accommodation space 110 partially protruding from a side of the safety body 110 , and a battery 300 accommodated in a battery accommodation space 120 at a rear side of the safety helmet body 100 , for supplying electric power to the communication unit 500 and the lighting part 400 . hereinafter , a configuration and an operation of the safety helmet according to the exemplary embodiment of the present invention will be described in detail . first , when the safety helmet body 100 and the heat radiation part 200 are formed of a resin and a metal , respectively , the heat radiation part 200 is inserted into a mold to be coupled to the safety helmet body 100 when the safety helmet body 100 is injection - molded , after being integrally processed . the shape of the safety helmet body 100 corresponds to a structure having a semispherical space therein to accommodate the head of a human body . of course , if necessary , an inner sheath such as styrofoam may be applied to an inside of the safety helmet body 100 . an accommodation space 110 partially protruding from the semispherical structure while not contacting the wearer is provided at a side surface of the safety helmet body 100 , and a battery accommodation space 120 for providing a space for accommodating the battery 300 is provided on a rear surface of the safety helmet body 100 . a lighting part case 450 of which a front side is opened and having a recess to which a switch 460 is coupled at an upper portion thereof is also integrally injection - molded with the safety helmet body 100 . then , one end of the heat radiation part 200 is inserted into an inside of the lighting part case 450 , and thereafter , the substrate 410 having the led 420 is configured to contact the heat radiation part 200 located in an inside of the lighting part case 450 such that heat emitted from the led 420 may be more effectively transferred to the heat radiation part 200 to be radiated . fig4 is a sectional view of the heat radiation part 200 . referring to fig4 , heat radiation fins 210 are arranged in a lengthwise direction of the heat radiation part 200 , and a plurality of protrusions 220 are provided on a bottom surface of the heat radiation part 200 . the heat radiation fins 210 may increase heat radiation efficiency by increasing a surface area of the heat radiation part 200 , and the plurality of protrusions 220 may allow the safety helmet body 100 to be more firmly jointed . the heat radiation fins 210 function as reinforcing ribs , thereby increasing strength of the safety helmet body 100 while minimizing an increase in the entire weight of the safety helmet body 100 . a battery accommodation space 120 is provided on a rear surface of the safety helmet body 100 spaced apart from the heat radiation part 200 . the battery accommodation part 120 provides a space of a predetermined volume , and the battery is accommodated in the battery accommodation part 120 to supply electric power to the substrate 410 and the communication unit 500 . the lighting part 400 is configured such that the led 420 is operated by supplying electric power of the battery 300 to the substrate 410 through manipulation of the switch 460 by the wearer , and is provided with a reflection part 430 for limiting an emission angle of light and a lens 440 to project light of the led 420 at a predetermined angle for lighting . the lens 440 may be replaced by a transparent or semitransparent cover in consideration of light efficiency . fig5 is a diagram of another embodiment of the lighting part 400 . referring to fig5 , the lighting part includes a plurality of leds 420 , and the leds 420 may have reflection parts 431 and 432 having different radiation angles , respectively . that is , the leds 420 corresponding to the reflection parts 431 and 432 having a specific radiation angle may be selected by manipulating the switch 460 to supply electric power , and light having a wide radiation angle and light having a narrow radiation angle may be selected and used . in this way , the present invention can allow the wearer to select intensive light or general light according to the operation , thereby improving convenience . fig6 is a diagram of an embodiment of a communication unit applied to the present invention . referring to fig6 , the communication unit 500 applied to the safety helmet according to the present invention includes a communication module 510 coupled to an inside or an outside of the safety helmet body 100 , in detail , for performing wireless communication with another neighboring communication unit 500 , a camera 520 for photographing an image , a control unit 530 for storing images photographed by the camera 520 at a predetermined period , including the stored images to determine an accident , and controlling handling of an accident if the accident is determined as having occurred , an input unit 550 for allowing the wearer to perform a control input , an emergency signal generation unit 570 for generating an emergency signal under the control of the control unit 530 , a bluetooth communication unit 560 for communicating with a mobile phone 580 of the wearer to request a rescue under the control of the control unit 530 in the case of an accident , a radio reception unit 590 for receiving a radio broadcast , a gps module 595 for receiving a gps signal , and a proximity sensor 597 for identifying a wearing state of the safety helmet and if the safety helmet is not worn , informing the control unit 530 that the wearing state is released to stop the communication module 510 including a microphone 511 and a speaker 512 . hereinafter , a method of handling an accident using the above - configured safety helmet provided with a communication unit will be described . first , normally , an image photographed by the camera 520 may be transmitted to a nearby manager terminal through the communication module 510 to allow the manager to identify the contents of the operation or display the contents of the operation on a terminal of a leader when the safety helmet is used in a leisure activity such as mountain climbing , or operators , a manager and an operator , or mountain climbers may perform voice communication by using the microphone 511 and the speaker 512 . hereinafter , the communication module 510 , the microphone 511 , and the speaker 512 are generally referred to as a communication unit . in leisure activities such as mountain climbing , a radio broadcast may be received by the radio reception unit 590 and may be listened to through the speaker 512 . according to the present invention , because the microphone 511 and the speaker 512 are adjacent to each other , when a space is produced between the microphone 511 and the speaker 512 while electric power is supplied to the communication module 510 , that is , the wearer takes off the safety helmet , howling occurs so that a howling sound may be generated through the speakers 512 of other users . howling can be prevented by cutting off electric power of the communication module 510 when the safety helmet is taken off , by detecting the wearing state of the safety helmet using the proximity sensor 597 . the control unit 530 stores images of the camera 520 in a memory 540 as still image data at a predetermined period , and compares the still image data stored at a previous period with the currently stored still image data . after repeatedly performing the comparisons , generation of an accident is primarily determined if a state in which a motion of the wearer is not detected continuously for a predetermined time period . the control unit 530 , the camera 520 , and the memory 540 act as a detection means for detecting an accident , and it will be described below that the camera 520 may be replaced by a gyro sensor . that is , still images are stored in the memory 540 at an interval of 10 seconds , and if a state having no motion continues for one minute after the comparison of the still images , an accident is determined as having occurred . an accident also may be recognized by a chronic disease or a state of health of the wearer or leakage of a specific gas in the field through the determination method even when an external impact is not applied . this can place the highest value on the life of the wearer as compared with a safety helmet which detects an impact directly applied to the safety helmet according to the related art . that is , the detection means applied to the present invention detects the state of the wearer as a result , and detects an accident while paying attention to the result rather than the cause of the accident . in addition to the primary determination method for an accident using the camera 520 , a sensor for detecting a motion of a gyro sensor ( not shown ) may be used . that is , a state in which a motion is not detected by a sensor for detecting a motion continues for a preset time or more , an accident may be primarily determined as having occurred . if an accident is determined as having occurred , the control unit 530 identifies whether an accident has actually occurred , whether the wearer concentrates on work and is not moving at all , or whether the wearer is conscious when an accident occurs through a consciousness identification means including the memory 540 , the control unit 530 , and the speaker 512 . this reproduces a voice signal stored in the memory 540 through the speaker 512 and requests a response from the wearer . an example of the voice signal may be a question such as “ master , are you ok ?”, and if the wearer pushes a specific button of the input unit 550 or speaks , the control unit 530 determines that an accident did not occur or that the wearer is conscious even though an accident has occurred . that is , after the voice signal is output , the control unit 530 identifies whether a voice signal is input through the microphone 511 or the input unit 550 within a predetermined time period , and determines that an accident did not occur or that the wearer is conscious even when an accident has occurred if a voice is input or an input signal is input through the input unit 550 . when the wearer is conscious , an emergency button provided in the input unit 550 is pushed to report the accident . the reporting of the accident follows an operation which is the same as or similar to the case of the operator not being unconscious which will be described below , and a detailed description thereof will be omitted . to the contrary , if neither a voice nor an input signal is input , the control unit 530 finally determines that the wearer is unconscious , and generates an emergency signal through the emergency signal generation unit 570 and connects to the portable terminal 580 of the wearer through the bluetooth communication unit 560 , which is a report means , to request a rescue from an emergency services center . then , the rescue request contents may be voice data stored in the memory 540 in advance , text messages , or communication data stored in advance , and the rescue request contents may include the name , the gender , the blood type , the age , the chronic disease , and the past disease history of the wearer , and may include a current location of the accident using gps data received by the gps module 595 . that is , the information of the wearer is stored in advance , and is collectively transmitted to the rescue team to aid in the rescue operation . further , surrounding colleagues may be informed of the generation of the accident . the voice signal stored in the memory 540 may be transmitted to be reported through the communication module 510 , and a short text message may be collectively transmitted to stored phone numbers . according to the present invention , an accident due to various causes can be determined irrespective of the causes , and the generation of the accident can be automatically reported and handled even when the accident sufferer is unconscious , whereby the value of respect of a life can be realized . further the present invention can be applied to a wide range of applications . for example , according to the present invention , an accident which may occur during a leisure activity such as rafting or cycling can be automatically handled , and a mission can be easily performed using a military safety helmet and an accident can be automatically handled as well . in addition , for example , senior citizens who live alone often freeze to death while sweeping snow , which recently has been an issue , in which case , accidents or states of consciousness of the senior citizens who cannot be cared for by neighbors can be automatically transmitted to hospitals or emergency service centers , whereby the senior citizens &# 39 ; problems can be solved . it will be appreciated by those skilled in the art to which the present invention pertains that the present invention is not limited to the embodiment and may be variously modified without departing from the spirit of the present invention . the present invention uses a lighting part employing leds in a safety helmet , and solves inconvenience due to radiation of heat of the leds , and identifies occurrence of an accident of a helmet wearer to automatically take a measure according to the result , thereby achieving industrial applicability of providing the wearer with safety and convenience .