Emergency Flashing Indication System for Floor Evacuation Route Guidance

Abstract

The present invention relates to an emergency flashing indicator system for investigating evacuation routes on a floor surface, comprising a signal receiving unit that receives a fire signal generated from a fire receiver in real time and controls the initiation of operation of the device, and a light source unit that generates high-intensity directional light under the control of the signal receiving unit to provide light that can be clearly perceived even in situations where visibility is limited.

Description

Technology Field

[0001] The present invention relates to an emergency flashing indicator system for investigating floor surface evacuation routes. Background Technology

[0003] Generally, buildings are equipped with evacuation guidance lights to guide evacuees' movement paths in the event of a fire or disaster. These lights are typically fixed above emergency exits or on walls and illuminate with visually clear arrows, text, and pictograms to indicate the direction of evacuation. However, when a fire occurs, smoke spreads rapidly upwards, and a layer of high-concentration smoke forms in the ceiling and upper spaces, particularly due to thermal convection. Consequently, guidance lights installed on walls or ceilings become obscured by smoke, making identification difficult. As a result, evacuees may fail to locate exits amidst unstable visibility or move in the wrong direction, potentially delaying evacuation time. This issue has been identified as one of the major causes of fatal casualties during fire situations.

[0004] In addition, during the evacuation process, evacuees often naturally assume a crouching or crawling position to prevent smoke inhalation. In such cases, the focus of their vision shifts downward, making it even more difficult to perceive guide lights installed above. In particular, there is a problem where short evacuees, such as children or the elderly, cannot easily recognize upper guide lights even with normal vision.

[0005] Furthermore, facilities designed to prevent the spread of fire, such as fire shutters and fire doors, are installed inside buildings. When a fire shutter operates, the main circulation routes normally used are blocked, and failure to immediately identify an adjacent emergency exit results in a delay in evacuation. Existing exit lighting systems are not synchronized with the operation of fire shutters, lacking the capability to immediately guide people to new alternative routes in the event of an actual fire.

[0006] In conventional technology, high-intensity guide lights, flashing indicator lights, or voice guidance systems have been proposed to address these issues; however, most of these rely on the field of view from above and have failed to fundamentally resolve the problem of reduced visibility in smoke-diffused environments. Therefore, a visual evacuation route indicator device that projects directly onto the floor surface has become necessary. The problem to be solved

[0008] The present invention has been devised to solve the above-mentioned problems and provides an emergency flashing indicator system for investigating evacuation routes on the floor surface.

[0009] The technical problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0011] An emergency flashing indicator system for investigating a floor evacuation route according to one embodiment of the present invention includes a signal receiving unit that receives a fire signal generated from a fire receiver in real time and controls the initiation of operation of the device, and a light source unit that generates high-intensity directional light under the control of the signal receiving unit to provide light that can be clearly perceived even in situations where visibility is limited.

[0012] In one embodiment, the apparatus further includes an optical unit configured to concentrate or diffuse light generated from the light source unit to display a specific illumination pattern in the shape of a circle, a linear or an arrow on the floor surface, and a flashing control unit that controls the light source unit to flash at a constant or variable period according to a signal from the signal receiving unit, thereby focusing the attention of evacuees and improving the evacuation path recognition rate.

[0013] In one embodiment, the optical unit is configured to form an arrow-shaped pattern so that evacuees can intuitively recognize the direction they need to move in the event of a fire, or to form a circular or character-shaped pattern so that the location of the escape route can be clearly identified, and the flashing control unit is configured to flash the light source unit at a short cycle of 0.5 to 1 second, or to variably control the flashing speed according to the location of the fire and the speed of smoke spread, thereby enabling evacuees to quickly and accurately identify the escape route through the floor surface even in situations where the upper guide light is obscured by smoke spread.

[0014] In one embodiment, the device may further include a power unit with a built-in rechargeable emergency battery that operates normally via commercial power but can continue to operate for a certain period of time even in the event of a power outage, thereby enabling the device to reliably display evacuation routes even if the power supply is cut off in the event of a fire or disaster.

[0015] In one embodiment, the flashing control unit is configured not merely to flash the light source unit at a constant frequency, but to analyze the location of the fire, the direction of smoke spread, and the movement path of evacuees in real time in conjunction with a sensor module or a central disaster prevention system, and then to variably control the flashing pattern, flashing period, illumination angle, and type of illumination pattern of the light source unit according to the analysis results. Accordingly, when there are many evacuees, the flashing speed is increased to concentrate attention, and when smoke spread is concentrated in a specific direction, a stronger illumination pattern is formed on the floor surface in the opposite direction to intuitively guide the evacuation path. Additionally, depending on the location of the escape route, an arrow pattern is illuminated and flashed in the order of the movement path to provide a continuous path guidance effect.

[0016] In one embodiment, the optical unit further comprises a lens cover that protects a lens for focusing or diffusing light generated from the light source unit while maintaining stable structural strength and optical transparency even in high-temperature flame, high-concentration smoke, and shock environments, wherein the lens cover is formed of a composite material comprising 25 to 35 weight percent of a polyphenylene sulfide (PPS) or polyetheretherketone (PEEK)-based high-performance engineering resin, 20 to 30 weight percent of alumina-zirconia composite ceramic nanoparticles, 5 to 8 weight percent of graphene oxide or fluorinated graphene nanoplatelets, 10 to 15 weight percent of a phosphorus-based flame retardant, and 5 to 7 weight percent of borosilicate glass microparticles or silica microfillers, wherein the composite material comprises 2 to 4 weight percent of hybrid organic-inorganic silsesquioxane nanoclusters to suppress crack propagation in a thermal shock environment, and for a long time To prevent yellowing caused by high-intensity luminescence, it may be characterized by containing 1 to 3 weight percent of ceria (CeO₂)-doped rare earth oxide powder, and 1 to 2 weight percent of fluorine-based nanofibers (FEP or PTFE-based) dispersed to maintain electrical insulation in a high-humidity environment.

[0017] The means for solving the problem described above are merely exemplary and should not be interpreted as intended to limit the present invention. In addition to the exemplary embodiments described above, additional embodiments may exist in the drawings and the detailed description of the invention. Effects of the invention

[0019] The emergency flashing indicator system for investigating floor evacuation routes according to the present invention has the following effects due to the above-described configuration.

[0020] The present invention has been devised to solve the problems of the conventional technology described above, and by irradiating a high-intensity, directional light onto the floor surface in conjunction with a fire signal, it enables evacuees to quickly and accurately recognize the evacuation route even in situations where the visibility of the upper guide light is blocked by smoke.

[0021] First, the system of the present invention receives a fire signal generated from a fire receiver or a central fire prevention facility in real time through a signal receiving unit and immediately initiates the operation of the device based on this. Accordingly, evacuation routes are displayed without delay in initial response after a fire occurs, thereby minimizing the delay in the start of evacuation.

[0022] Second, the light source unit and optical unit of the present invention use a high-intensity LED or LD light source to project various patterns, such as arrows, circles, and characters, onto the floor surface. These patterns are provided in a form that evacuees can intuitively understand, enabling them to quickly recognize the direction of evacuation and move. In particular, by using a directional light that minimizes scattering effects in a smoke environment, clear path identification is possible even in the field of view below the smoke layer.

[0023] Third, the flashing control unit of the present invention does not simply maintain the illumination of the light source, but rather focuses the attention of evacuees through short-cycle flashing of 0.5 to 1 second or variable-cycle control depending on the situation. Furthermore, the flashing pattern goes beyond simple flashing and applies a sequential lighting method to naturally guide the evacuation flow in corridors or junctions. This flashing and sequential control improves the speed of perception and reaction compared to conventional static guidance lights and reduces evacuation confusion even in situations where a large number of people gather.

[0024] Fourth, the present invention incorporates a rechargeable emergency battery in addition to commercial power, allowing it to operate stably for a certain period of time even in the event of a power outage. Therefore, even if the power supply is cut off due to a fire, the system continuously displays evacuation routes, minimizing dependence on power and ensuring stability in emergency situations.

[0025] Fifth, the present invention, when necessary, links with a sensor module and a central disaster prevention system to analyze the location of a fire, the direction of smoke spread, and the distribution of evacuees in real time, and automatically adjusts the flashing cycle, light intensity, and illumination pattern based on the results. For example, if smoke spreads in a specific direction, an arrow pattern in the opposite direction is emphasized, or if a large number of people gather, the flashing cycle is increased to enhance visibility. This intelligent control function significantly improves safety in actual building environments.

[0026] Therefore, the emergency flashing indicator system for floor evacuation route investigation according to the present invention overcomes the limitations of existing upper guidance lighting systems, enabling evacuation guidance with immediacy, intuitiveness, and continuity even in smoke-diffusion environments, and further provides the effect of minimizing casualties.

[0027] The effects of the present invention are not limited to those mentioned above, and various effects may be included within the scope obvious to a person skilled in the art from the contents described below. Brief explanation of the drawing

[0029] FIG. 1 is a schematic diagram showing an emergency flashing indicator system for investigating a floor surface evacuation route according to one embodiment of the present invention. FIG. 2 is a block diagram of an emergency flashing indicator system for investigating a floor surface evacuation route according to one embodiment of the present invention. FIGS. 3 and 4 are drawings showing an emergency flashing indicator system for investigating a floor evacuation route according to an embodiment of the invention installed on a wall. FIGS. 5 to 8 are drawings showing a storage module of an emergency flashing indicator system for investigating a floor surface evacuation route according to an embodiment of the present invention. Specific details for implementing the invention

[0030] The following detailed description of the invention refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that various embodiments of the invention are different but need not be mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in relation to one embodiment.

[0031] Furthermore, it should be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the invention. Accordingly, the following detailed description is not intended to be taken in a limiting sense, and the scope of the invention is limited only by the appended claims, including all equivalents thereof, provided appropriately described. Similar reference numerals in the drawings refer to the same or similar functions across various aspects.

[0032] Meanwhile, throughout this specification, when a part is described as “comprising” a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, the “part” for a component as used in this specification performs at least one function or operation. And the “part” may perform the function or operation by hardware, software, or a combination of hardware and software.

[0033] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but these components are not limited by the aforementioned terms. The aforementioned terms are used solely for the purpose of distinguishing one component from another.

[0034] In this specification, terms such as “comprising” are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. When a component is referred to as being “connected” to another component, it should be understood that it may be directly connected to or coupled with the other component, or that there may be other components in between.

[0035] Furthermore, in describing the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the essence of the invention, such detailed description is abbreviated or omitted.

[0036] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

[0037] FIG. 1 is a schematic diagram showing an emergency flashing indicator system for investigating a floor surface evacuation route according to one embodiment of the present invention.

[0038] FIG. 2 is a block diagram of an emergency flashing indicator system for investigating a floor surface evacuation route according to one embodiment of the present invention.

[0039] FIGS. 3 and 4 are drawings showing an emergency flashing indicator system for investigating a floor evacuation route according to an embodiment of the invention installed on a wall.

[0040] FIGS. 5 to 8 are drawings showing a storage module of an emergency flashing indicator system for investigating a floor surface evacuation route according to an embodiment of the present invention.

[0041] The present invention relates to an emergency flashing indicator system (10) for surveying evacuation routes on a floor surface, which compensates for the problem of conventional guide lights installed on the upper surface being obscured from view by smoke in disaster situations such as fire, and enables evacuees to move quickly and accurately using the floor surface as a visual reference.

[0042] In particular, by using a signal from a fire alarm receiver as a trigger to project high-intensity, directional light onto the floor in patterns (arrows, circles, characters, etc.) and controlling the flashing cycle according to the situation, it simultaneously achieves alertness and path recognition. This concept stems from the practical constraint of "reduced visibility of overhead exit lights (due to rising smoke)" and the necessity of "path indication through floor illumination."

[0043] In addition, it is effective to use flashing floor markings to immediately indicate the direction of nearby emergency exits in the event that the existing circulation path is blocked by the operation of fire shutters.

[0044] The signal receiving unit (100) receives a fire signal transmitted from a fire receiver (not shown) or a central fire prevention facility (not shown) in real time, and immediately upon receiving it determines whether the conditions for starting the operation of the system are satisfied.

[0045] At this time, the receiving signal may be provided by a conventional contact (relay) signal, a low-voltage DC control signal, or a communication protocol (e.g., RS-485, CAN, etc.).

[0046] The signal receiving unit (100) prevents malfunction by ensuring electrical isolation (opto-isolation) and noise immunity, and verifies the validity of the signal (holding time, pulse width, priority among multiple events, etc.).

[0047] The light source unit (200) generates high-intensity directional light under the control of the signal receiving unit. The light source may use a high-power LED or a laser diode, and the luminous flux, luminous intensity, half-intensity angle, and wavelength (e.g., green at 520 nm, red at 630 nm) are designed considering the balance between the evacuee's visibility and glare.

[0048] The emphasis on directivity is intended to minimize scattering effects in hazy environments and form clear boundary patterns on the floor surface. The light source ensures long-term reliability by incorporating a driving driver (constant current drive), surge and reverse connection protection, and temperature feedback (thermistor / NTC).

[0049] The optical unit (300) serves to concentrate or diffuse light emitted from the light source unit and convert it into an illumination pattern such as a circle, a line, an arrow, or a character on the floor surface.

[0050] The optical system may include various image forming means such as single or multiple lenses, waveguides, gobo films, and DLP / LCOS. Arrow patterns intuitively indicate the direction of travel, while circles or text (e.g., “EXIT,” “Emergency Exit”) function as markers for the destination.

[0051] Depending on the installation environment (corridor width, ceiling height, floor reflectivity), focal length, astigmatism, and keystone correction are designed to ensure a clear edge and sufficient contrast at a certain projection distance.

[0052] The flashing control unit (400) flashes the light source unit at a constant or variable period depending on the result of receiving the signal.

[0053] Flashing is a representative visual stimulus that induces a human attention response, and the pulse frequency is selected within a range that does not cause fatigue or discomfort. Flashing can be driven using Pulse Width Modulation (PWM) or Amplitude Modulation (AM) methods, and supports profiles such as duty cycles, rise and fall times, and fade-in / fade-out to generate visual rhythms suitable for the environment.

[0054] Since smoke moves upward during a fire, upper guide lights are easily difficult to perceive due to obstructed visibility. Accordingly, the present invention utilizes the lower part of the evacuee's field of vision, that is, the floor surface. At this time, the flashing cycle is set to a short cycle of 0.5 to 1 second as a basic example, but in actual operation, it is applied variably considering smoke concentration, afterglow, and the flow velocity of the evacuee.

[0055] For example, in areas where smoke spreads rapidly, short cycles are used to increase visibility, while medium cycles are used to reduce fatigue in relatively stable areas. Additionally, by adjusting the luminous intensity and illumination angle considering pattern brightness and background contrast (floor color, reflectance), the outline of the pattern is clearly visible even when evacuees are moving in a crouched position.

[0056] Arrow patterns guide changes of direction in entry and turning sections, while circular or text patterns clearly indicate the arrival of the objective on the floor adjacent to the escape route.

[0057] Character patterns can be used in parallel with multilingual or pictograms, and can be combined into multi-layered patterns (e.g., arrow + “EXIT”) to provide superimposed information without cognitive conflict.

[0058] This system operates on commercial power under normal conditions and incorporates a rechargeable emergency battery to maintain operation for a certain period of time even in the event of a power outage.

[0059] The power unit (500) may include a charge / discharge management circuit (BMS), overcurrent / overvoltage / temperature protection, state of charge (SOC) estimation, and self-diagnosis functions.

[0060] In this case, the battery capacity is calculated by considering the building's evacuation safety standards (e.g., minimum secured time) and the light source's power consumption (nominal luminous intensity, duty cycle, efficiency).

[0061] In addition, when commercial power is restored, uninterrupted load switching or soft switching is automatically performed to prevent momentary blinking or delay in relighting.

[0062] The power unit (500) is designed to satisfy power factor correction (PFC), EMI filter, surge protection, and insulation reliability in a combustion environment. It prevents malfunctions by blocking ground loops with an isolated DC-DC converter from the communication and control unit. In an emergency power state, a power management algorithm automatically applies brightness upper limit / cycle optimization to maximize duration while maintaining an effective line of sight.

[0063] The flashing control unit (400) goes beyond simple periodic control and analyzes the location of the fire, the direction of smoke spread, and the movement path of evacuated personnel in real time by linking with sensor modules (e.g., temperature, smoke concentration, CO / CO₂, thermal imaging, ToF (Time-of-Flight) personnel detection, ultrasonic count) and a central disaster prevention system. Based on the analysis results, it performs dynamic control as follows.

[0064] First, variable control of flashing patterns, cycles, and brightness. When a large number of evacuees are present, the flashing speed is increased to focus their attention, and once crowd congestion subsides, the duty cycle is lowered to reduce fatigue. In directions with high smoke density, the brightness and area of ​​the corresponding pattern are temporarily increased to ensure visibility, or conversely, the pattern in the direction of the safe path is relatively emphasized to enhance visual guidance.

[0065] Second, the illumination angle and pattern types have been reconfigured. At corridor branches or corners, arrow patterns are designed to light up sequentially in a progression order (e.g., ①→②→③) to provide fluid route guidance. This creates dynamic visual signals that evacuees can easily follow unconsciously, reducing decision-making time compared to static signage.

[0066] Third, reflection of obstacle and blockage information. If the existing circulation path is blocked due to the lowering of fire shutters or other factors, the floor pattern of the alternative route is immediately reinforced through linkage with the central disaster prevention signal, and if necessary, the detour route is highlighted using a composite pattern of text and arrows.

[0067] Fourth, feedback-based maintenance / safety logic. When light source degradation, contamination (lens issues), or output degradation are detected by sensors or self-diagnosis, the system automatically corrects the issue (increases brightness, optimizes duty cycle) or sends a maintenance notification to the central system when a threshold is reached. Intelligent control is implemented as firmware running on an MCU / MPU and may include rule-based logic that models the situational context or simple statistical estimation.

[0068] (Straight corridor): When the fire receiver emits a fire signal along with an alarm, the signal receiving unit begins operation without delay. The light source unit lights up, and the optical unit forms a forward arrow pattern on the corridor floor. The flashing control adopts a short cycle of 0.5 to 1 second to quickly draw attention, and in the section near the escape route, a circular "EXIT" text switches to a fixed light to clearly indicate the destination.

[0069] (Corner / Branch): If high smoke concentration is detected in the right branch direction, intelligent control sequentially illuminates the arrows on the left path (①→②→③) to form a flow, while temporarily limiting the brightness and area of ​​the right arrow to suppress erroneous entry. At this time, if the crowd density sensor detects the formation of a crowd, the flashing speed is increased by one level to enhance visibility.

[0070] (Fire Shutter Lowering): The moment the existing route is blocked by the shutter, and a shutter operation signal is received from the central fire control system, the system immediately highlights the floor pattern of the alternative route direction with high-intensity, high-frequency flashing and adds the word "Detour" to the section adjacent to the shutter to prevent confusion.

[0071] According to the present invention, (i) path recognition is possible through floor surface patterns even when the upper guide light is obscured by smoke, (ii) evacuation efficiency is improved by drawing attention and guiding flow through flashing and sequential lighting, (iii) continuous operation is possible using emergency power even in the event of a power outage, and (iv) perception errors and bottlenecks in actual building environments can be reduced through situation-adaptive control based on sensor / disaster prevention linkage.

[0072] An optical unit (300) according to one embodiment of the present invention may include a lens cover (310) that ensures the clarity and persistence of the illumination pattern formed by the optical unit to visually guide a floor evacuation path, and enables stable operation for a long period even in extreme environments such as fire, smoke, impact, and moisture.

[0073] The above lens cover (310) is formed of a functional composite material designed to physically and chemically protect the lens of the optical unit while simultaneously satisfying optical transparency and heat resistance and flame retardant performance.

[0074] This configuration is technically significant in that it achieves the durability and reliability required for floor markings that enable rapid path recognition even in situations where movement paths are blocked, such as when fire shutters operate, and is an essential element for floor-illuminated visual guidance to produce a practical evacuation effect in situations where the visibility of upper guidance lights is reduced by smoke.

[0075] In one embodiment, the lens cover (310) has 20 to 30 weight percent of alumina-zirconia composite ceramic nanoparticles dispersed on a matrix containing 25 to 35 weight percent of a high-performance engineering resin based on polyphenylene sulfide (PPS) or polyetheretherketone (PEEK), thereby ensuring fracture toughness and dimensional stability under thermal shock and mechanical shock.

[0076] The matrix resin maintains mechanical strength and shape stability even in a high temperature range of 250°C to 380°C, thereby suppressing deformation and sagging of the lens surface even with a rapid temperature rise caused by fire.

[0077] Ceramic nanoparticles can be pretreated to control the average particle size to a range of tens of nanometers to hundreds of nanometers to minimize scattering in the visible light region, introduce silane-based bonding groups to the surface to enhance interfacial bonding strength, or ensure compatibility with the organic-inorganic hybrid additive described below.

[0078] This ceramic reinforcement suppresses the occurrence of microcracks caused by the collision of smoke (aerosol) particles and temperature gradients, and significantly reduces fatigue failure during thermal cycles due to repeated switching on and off.

[0079] The lens cover (310) also contains 5 to 8 weight percent of graphene oxide or fluorinated graphene nanoplates to rapidly diffuse local heat from a high-intensity light source, thereby suppressing optical axis distortion and color coordinate deviation caused by thermal hot spots.

[0080] Because graphene-based fillers possess high thermal conductivity and a thin-film structure, they form a thermal diffusion network within the matrix to reduce instantaneous peak temperatures and simultaneously act as a crack arrester that delays the initiation of microcracks.

[0081] When using fluorinated graphene, the introduction of fluorine groups with low surface energy inhibits the adhesion of contaminants, thereby additionally ensuring resistance to smoke and soot.

[0082] Flame retardant performance is achieved by including 10 to 15 weight percent of a halogen-free phosphorus-based flame retardant.

[0083] Phosphorus-based flame retardants form a phosphate-based protective layer in the condensed phase during thermal decomposition, blocking the access of oxygen and flammable gases, and suppress dripping by increasing melt viscosity.

[0084] This condensed flame retardant mechanism is advantageous for the combustion delay and smoke reduction required for optical covers adjacent to electrical and electronic components, and lowers the risk of secondary fire in emergency lighting systems. Borosilicate glass microparticles or silica microfillers are introduced in an amount of 5 to 7 weight percent to lower the coefficient of thermal expansion (CTE) and stabilize transmittance and haze even in long-term thermal aging environments.

[0085] In particular, borosilicate series exhibit excellent thermal shock resistance, which suppresses the growth rate of microcracks caused by repeated rapid cooling and heating.

[0086] The heat resistance, optical and crack resistance properties of the above composite material are further enhanced by adding 2 to 4 weight percent of silsesquioxane nanoclusters of a hybrid organic-inorganic structure.

[0087] Haphsilanes possess an inorganic backbone connected by Si-O-Si and organic side chains in parallel, forming a multi-point bonding network between the matrix resin and the inorganic filler.

[0088] This network disperses stress concentration and suppresses interfacial delamination caused by inconsistencies in thermal strain, thereby minimizing the reduction in transmittance and optical axis misalignment even under long-term thermal cycling. In addition, to prevent yellowing and photodegradation caused by high-brightness long-term lighting, it contains 1 to 3 weight percent of ceria (CeO₂)-doped rare earth oxide powder.

[0089] Ceria-doped oxides effectively absorb and scatter light in the ultraviolet-blue wavelength range to suppress photochemical bond cleavage and delay the photooxidation reaction of the matrix through radical scavenging, thereby providing long-term stability of transmittance and color coordinates.

[0090] To ensure electrical safety and suppress surface contamination in environments where moist heat and smoke condensate are present, fluorine-based nanofibers (FEP or PTFE-based) are finely dispersed at 1 to 2 weight percent.

[0091] Since fluorine-based nanofibers possess both high insulation resistance and low surface energy, they suppress the formation of leakage current paths even under high humidity conditions and increase the contact angle of the lens cover surface, thereby reducing diffuse reflection and haze caused by the formation of a condensation film.

[0092] If necessary, the above-mentioned fluorine-based component can be process-controlled to further enhance stain resistance and water repellency by inducing microphase separation or gradient distribution to the surface.

[0093] The above lens cover is manufactured through a compounding and molding process. For example, when using PPS, after pre-drying at 120°C to 140°C, dry mixing and melt mixing are performed in a twin-screw compounder at a cylinder temperature of 290°C to 320°C and a mold temperature of 80°C to 120°C, and injection molding is performed after grinding and cooling.

[0094] In the case of using PEEK, a similar process is applied in a cylinder temperature range of 350°C to 390°C after pre-drying at 150°C to 170°C.

[0095] At this stage, to ensure uniform dispersion of graphene-based fillers and ceramic nanoparticles, it is desirable to alternate high-shear and low-shear sections, and to introduce half-silane nanoclusters in a stepwise manner in the form of a masterbatch to prevent aggregation at high temperatures. During injection, the gate position is positioned perpendicular to the optical path to prevent flow lines and weld lines from penetrating the center of the optical path, and the mold surface roughness is maintained using an optical standard (e.g., mirror polishing) to minimize scattering sources.

[0096] If necessary, a UV-curable polysiloxane hardcoat can be applied after molding to increase surface hardness and provide anti-reflective (AR) and anti-fog (AF) functions, and such post-processing is performed within a range that does not impede interfacial adhesion with the substrate.

[0097] The lens cover of the present embodiment can be implemented as a single-wall structure that completely encloses the lens of the optical unit, or as a multi-layer structure in which functional layers are laminated on the outer and inner surfaces.

[0098] Single-wall structures are advantageous for weight reduction and process simplification, while multi-layer structures are advantageous for separating and designing functions such as scratch resistance, stain resistance, and anti-reflection through design freedom.

[0099] In addition, the composition ratio of the composite material may be adjusted according to the design purpose within the range specified in the claim.

[0100] For example, in facilities where high-temperature durability is prioritized, the ceramic filling ratio may be set close to the upper limit, and in underground structures where high humidity and smoke environments are a concern, a method may be adopted to enhance the content of fluorine-based nanofibers and the water-repellent performance of the surface functional layer. All such variations are included within the scope of the technical concept of the present invention.

[0101] The lens cover configured as described above provides the effect of (i) suppressing mechanical damage and yellowing due to rapid temperature rise and thermal shock occurring in the early stages of a fire, (ii) maintaining the stability of the optical axis and the edge clarity of the irradiation pattern even under thermal cycles caused by repeated flashing and lighting, (iii) reducing the risk of secondary fire and electrical malfunction through a halogen-free flame retardant mechanism and insulation properties, and (iv) extending the long-term maintenance cycle by improving surface resistance to smoke contamination, condensation, and dust.

[0102] Consequently, the lens cover according to the present invention satisfies the high reliability and high visibility conditions required in the actual usage environment of a floor-illuminated emergency flashing indicator system, thereby reliably ensuring the attention of evacuees and the path recognition rate.

[0103] The present invention is not limited to the above embodiments, and those skilled in the art can achieve the same effect through various modifications, substitutions, and additions within the scope of the compositional range and structural requirements described in the claims.

[0105] [Example 1]

[0106] 30 wt% polyphenylene sulfide (PPS), 25 wt% alumina-zirconia composite ceramic nanoparticles, 6 wt% graphene oxide, 12 wt% phosphorus-based flame retardant, 6 wt% borosilicate microparticles, 3 wt% half-silane nanoclusters, 2 wt% ceria (CeO₂)-doped rare earth oxide, and 1.5 wt% fluorine-based nanofibers were mixed. The mixture was melt-kneaded using a twin-screw compounder at 320°C, followed by injection molding to produce a lens cover. The manufactured lens cover maintained a transmittance of over 92% without the need for an additional hard coating on the surface.

[0108] [Comparative Example 1]

[0109] A lens cover molded from a single material of general polycarbonate (PC) resin was used. A pure PC material without added flame retardants or inorganic reinforcing agents was injection molded at 260°C to produce the same shape. The lens cover had a similar initial transmittance of 91%, but yellowing and warping deformation were clearly observed in high-temperature and smoke environment tests.

[0111] The following tests were performed on the lens covers of Example 1 and Comparative Example 1.

[0113] Heat resistance test: Measurement of appearance change and transmittance after maintaining in a 300℃ thermal environment for 60 minutes.

[0114] Flame Retardancy Test: Determination of combustion class according to UL94 combustion test standards

[0115] Optical property test: Measurement of initial transmittance (550 nm), transmittance and yellowing (ΔYI) after heating for 60 minutes

[0116] Mechanical strength test: Check for crack formation after Charpy impact test and repeated thermal shock (100 cycles of rapid heating and cooling).

[0117] Moisture insulation test: Measurement of surface insulation resistance after 48 hours of exposure to 95% relative humidity

[0119] division Heat resistance (300℃ for 60 minutes) Flame retardant (UL94) Initial transmittance (%) Transmittance (%) after 60 minutes Yellowing ΔYI Impact strength (MPa ) Thermal shock crack Insulation resistance (Ω) Example 1 No modification V-0 grade 92 90 +1.2 4.5 doesn't exist more Comparative Example 1 Deformation or bending occurs HB grade 91 72 +12.5 2.1 Numerous microcracks

[0121] As can be seen from Table 1 above, the lens cover according to the embodiment of the present invention showed almost no structural deformation or decrease in transmittance even when exposed to a high temperature environment (300℃) for 60 minutes, and the change in yellowing was also minimal, so it was stable during long-term use.

[0122] In addition, due to the action of phosphorus-based flame retardants and ceramic fillers, it achieved a V-0 rating in the UL94 test and did not crack in repeated thermal shock tests. On the other hand, the comparative example showed severe deformation and yellowing upon exposure to high temperatures, and its insulation resistance also decreased rapidly in a humid environment, resulting in reduced safety.

[0123] Therefore, it can be seen that the composition of the present invention goes beyond a simple protective cover to satisfy optical stability, mechanical strength, heat resistance, flame retardancy, and insulation, and significantly improves the ability to respond to extreme environments required for emergency flashing indicator systems.

[0125] Meanwhile, in an emergency flashing indicator system (10) for investigating a floor evacuation route according to one embodiment of the present invention, a storage module (600) for stably storing and mounting a charging cable capable of charging a battery of a power unit (500) on a wall or one side of a column may be installed at a predetermined height.

[0126] The storage module (600) includes a module body (621), a sliding groove (622), a slide block (623), a cable connection part (624), moving rollers (625-1 to 625-6), a first guide groove (626) and a second guide groove (627).

[0127] The lower part of the module body (621) is formed by bending it into a round shape so that the rear end is fixed to a wall or column, and a sliding groove (622) is formed extending in the front-rear direction on the upper part.

[0128] The sliding groove (622) is configured so that the slide block (623) is seated thereon and can move in the forward and backward directions, and a plurality of moving rollers (625-1 to 625-6) are arranged at regular intervals on the lower side.

[0129] The slide block (623) has its lower portion bent to correspond to the shape of the sliding groove (622) and is seated in the sliding groove (622), and slides along the groove according to the movement of the charging cable.

[0130] The cable connection part (624) is installed on the upper front side of the slide block (623) to secure the charging cable.

[0131] The moving rollers (625-1 to 625-6) are installed at regular intervals along the sliding groove (622) so that their upper portions are exposed to the sliding groove (622) and they can move smoothly while supporting the lower portion of the slide block (623).

[0132] The first guide groove (626) is formed extending in the forward and backward direction on one side of the sliding groove (622) so that the first protrusion (623a), which protrudes downward from one side of the rear end of the slide block (623), engages with it to move back and forth, and at the same time prevents the slide block (623) from disengaging from the sliding groove (622).

[0133] The second guide groove (627) is formed extending in the front-rear direction on the opposite side of the sliding groove (622), opposite to the first guide groove (626), so that the second protrusion (623b), which protrudes downward from the other side of the rear end of the slide block (623), engages with and moves, and at the same time the slide block (623) does not detach from the sliding groove (622).

[0134] The above storage module (600) may additionally include a first fluid supply unit (618) and a second fluid supply unit (619).

[0135] The first fluid supply unit (618) is installed inside the guide groove with its lower portion bent to correspond to the shape of the first guide groove (626), and the first protrusion (623a) is seated on the end of the first piston rod exposed at the rear end. When the first protrusion (623a) advances in the front direction of the guide groove, the internal space is compressed and fluid (e.g., air, water, oil, etc.) is supplied to the moving rollers (625-1 to 625-6), and when it moves backward in the rear direction, the fluid is recovered again.

[0136] The second fluid supply unit (619) is also installed with its lower portion bent to correspond to the shape of the second guide groove (627), and the second protrusion (623b) is seated on the end of the second piston rod exposed at the rear end. This also operates by supplying fluid to the moving roller when moving forward and recovering it back into the internal space when moving backward.

[0137] The storage module (600) configured in this manner enables stable support and smooth movement of the charging cable as it moves in the forward and backward directions. As a result, damage or wear of the charging cable during movement can be minimized.

[0138] Although preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above. It is understood that various modifications can be made by those skilled in the art without departing from the essence of the invention as claimed in the claims, and such modifications should not be understood individually from the technical spirit or perspective of the present invention. Explanation of the symbols

[0141] 10. Emergency flashing indicator system for floor surface evacuation route inspection

Claims

Claim 1 The device comprises a signal receiving unit that receives a fire signal generated from a fire receiver in real time and controls the initiation of operation of the device, and a light source unit that generates high-intensity directional light under the control of the signal receiving unit to provide light that is clearly perceptible even in situations where visibility is limited; an optical unit configured to concentrate or diffuse the light generated from the light source unit to display a specific illumination pattern in the shape of a circle, a line, or an arrow on the floor surface; and a flashing control unit that controls the light source unit to flash at a constant or variable period according to a signal from the signal receiving unit to focus the attention of evacuees and improve the evacuation route recognition rate. The optical unit is characterized by being configured to form an arrow-shaped pattern so that evacuees can intuitively recognize the direction they must move in the event of a fire, or to form a circular or character-shaped pattern so that the location of the evacuation exit can be clearly identified. The flashing control unit is characterized by flashing the light source unit at a short period of 0.5 to 1 second, or by variably controlling the flashing speed according to the location of the fire and the speed of smoke spread, thereby allowing evacuees to quickly and accurately follow the evacuation route through the floor surface even in situations where the upper guide light is obscured by smoke spread. It is characterized by enabling identification and includes a power unit with a built-in rechargeable emergency battery that operates normally via commercial power but can continue to operate for a certain period of time even in the event of a power outage, thereby enabling stable display of evacuation routes even if the power supply is cut off in the event of a fire or disaster. The flashing control unit is configured not merely to flash the light source unit at a fixed interval, but to analyze the location of the fire, the direction of smoke spread, and the movement path of evacuees in real time in conjunction with a sensor module or a central disaster prevention system, and then to variably control the flashing pattern, flashing period, illumination angle, and type of illumination pattern of the light source unit according to the analysis results. Accordingly,It is characterized by increasing the flashing speed to concentrate attention when a large number of evacuees are present, forming a stronger illumination pattern on the floor surface in the opposite direction when smoke diffusion is biased in a specific direction to intuitively guide the evacuation route, and also providing a continuous route guidance effect by illuminating and flashing arrow patterns in the order of the movement path according to the location of the escape exit, and the optical unit further includes a lens cover that protects a lens for concentrating or diffusing light generated from the light source unit while maintaining stable structural strength and optical transparency even in high-temperature flame, high-concentration smoke, and impact environments, and the lens cover comprises 25 to 35 weight percent of a high-performance engineering resin based on polyphenylene sulfide (PPS) or polyetheretherketone (PEEK), 20 to 30 weight percent of alumina-zirconia composite ceramic nanoparticles, 5 to 8 weight percent of graphene oxide or fluorinated graphene nanoplatelets, 10 to 15 weight percent of a phosphorus-based flame retardant, and borosilicate An emergency flashing indicator system for floor surface evacuation route inspection, characterized by being formed from a composite material containing 5 to 7 weight percent of glass microparticles or silica microfillers, comprising 2 to 4 weight percent of hybrid organic-inorganic silsesquioxane nanoclusters to suppress crack propagation in a thermal shock environment, comprising 1 to 3 weight percent of ceria (CeO₂)-doped rare earth oxide powder to prevent yellowing caused by prolonged high-intensity luminescence, and dispersing 1 to 2 weight percent of fluorinated nanofibers (FEP or PTFE-based) to maintain electrical insulation in a high-humidity environment. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 delete

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