WO2004076915A1

WO2004076915A1 - Escape way direction system

Info

Publication number: WO2004076915A1
Application number: PCT/KR2003/000766
Authority: WO
Inventors: Jae-Sul Son
Original assignee: Jae-Sul Son
Priority date: 2003-02-25
Filing date: 2003-04-16
Publication date: 2004-09-10
Also published as: KR100564344B1; AU2003222464A1; KR20040076396A

Abstract

Provided is a system for guiding ways of escape. The system guides people to safe places in event of an emergency situation such as a fire, explosion, leakage or dangerous gas, or shut down of a normal power. The system comprises a plurality of display devices and sensors for sensing occurrence of the dangerous emergency situation and a controller for controlling microcomputers of the display devices. The display device has a laser provided along the way of escape for generating laser light and a light guide for transmitting the light from the laser, and a plurality of indicating mark arranged along the light guide for emitting the laser light.

Description

ESCAPE WAY DIRECTION SYSTEM

Technical field

The present invention relates to a system for guiding escape paths, and more particularly, to a system for guiding escape paths, which guides people along escape paths so that they can safely and quickly escape in case of an emergency situation.

Background Art As well known in the art, buildings, underground passages, subway stations and the like are equipped with a variety of escape facilities and apparatuses so that people can quickly escape to safety in the event of an emergency situation such as a fire, explosion, leakage of toxic gas, flooding or collapse. Escape apparatuses include display devices such as an emergency light installed at passages, entrances/exits, stairs or the like of buildings to visually indicate escape paths, and alarms for issuing warning sounds to guide escapes.

As an example of such conventional escape apparatuses, Korean Patent Laid-Open Publication No. 2001-81989 discloses a display device that includes lighting for indicating an exit on a case representing an external appearance, and a semiconductor laser for generating laser light by operating in response to a signal input from a fire detector for sensing the occurrence of a fire. Since the laser light of the semiconductor laser has a high brightness, and superior directional and coherent properties, people can easily identify the display device such that find an escape path due to the laser light of the semiconductor laser even in smoke or darkness.

As another example, Korean Patent No. 321215 discloses a technique in which laser light generated from a semiconductor laser is transmitted by a light guide and arrow-shaped guidance marks are printed with reflecting or fluorescent materials on the surface of the light guide. With this technique, since the laser light of the semiconductor laser distinguishes the guidance marks while being transmitted by the light guide, people can easily identify the guidance marks and thus find an escape path even in smoke or darkness. However, the conventional techniques described above merely indicate only the direction of an escape path without considering the tendency of escape behaviors of people by which they attempt to escape through normally used passages and stairs or to proceed toward the first discovered passage or bright place. Thus, there is a problem in that this leads to confusion in the escape behaviors of people. That is, in the event of a sudden emergency situation such as a fire or explosion within a building, people tend to lose their reason while confused or seized with fear. In such a situation, for example, if there are two or more escape paths indicated by display devices in front of the people, there is high probability that the people will run around in confusion and spend time without knowing which escape path should be used. In particular, there are cases where people aimlessly escape while viewing only display devices that are lighted in a passage directed to a place where an emergency situation has occurred, and thus, those cases are directed to fatal accidents.

Disclosure of Invention

Accordingly, the present invention is contrived to solve the aforementioned problems in the prior art. An object of the present invention is to provide a system for guiding escape paths, which can accurately guide people so that they can escape through safer and shorter escape paths in a case of an emergency situation.

Another object of the present invention is to provide a system for guiding escape paths, which allows people to easily identify the escape paths and to escape through the escape paths. A further object of the present invention is to provide a system for guiding escape paths, which can guide people so that they can safely and quickly escape by dynamically displaying escape directions along the escape paths.

According to the present invention for achieving the objects, there is provided a system for guiding an escape path, comprising a plurality of display devices which are installed along the escape path through which people can escape upon occurrence of an emergency situation, and each of which includes a semiconductor laser for generating laser light, a light guide for transmitting the laser light generated from the semiconductor laser, a plurality of indicating marks arranged along the length of the light guide to scatter and emit the laser light transmitted through the light guide, and a microcomputer for controlling an operation of the semiconductor laser; an emergency situation-sensing means installed at the escape path to sense the occurrence of the emergency situation; and a control means interfaced with the microcomputers of the display devices to control the microcomputers of the display devices in response to a signal input from the emergency situation-sensing means.

Brief Description of Drawings Fig. 1 is a plan view schematically showing an example of an escape path where display devices of a system for guiding escape paths according to the present invention are installed.

Fig. 2 is a block diagram illustrating control of the system for guiding the escape paths according to the present invention. Fig. 3 is a block diagram illustrating control of the display device according to the present invention.

Fig. 4 is a perspective view showing a structure of the display device according to the present invention.

Fig. 5 is a sectional view taken along line V-V of Fig. 4. Fig. 6 shows another example of a light guide of the display device according to the present invention.

Fig. 7 is a sectional view showing a further example of the light guide of the display device according to the present invention.

Fig. 8 is a front view partially showing another example of an indicating mark in the light guide according to the present invention. Fig. 9 is a sectional view taken along line IX-IX of Fig. 8. Fig. 10 is a front view showing another example of the display device according to the present invention.

Fig. 11 is a plane view schematically showing an example of escape paths where the display devices, sub-display devices and mirrors of the system for guiding the escape paths according to the present invention are installed.

Fig. 12 is a perspective view showing structures of a light guide and a housing in the sub-display device according to the present invention. Fig. 13 is a flowchart illustrating a method of guiding escape paths according to the present invention.

Best Mode for Carrying out the Invention

Hereinafter, preferred embodiments of a system for guiding escape paths according to the present invention will be described in detail with reference to accompanying drawings.

Firstly, referring to Figs. 1 and 2, the system for guiding escape paths according to the present invention comprises a plurality of display devices 10-1, 10-2, ... and 10-n (hereinafter, generally referred to as 10) for visually displaying escape directions, which are installed along a first passage 1-1, a second passage 1-2 and a third passage 1-3 of an escape path 1 through which people can escape upon occurrence of an emergency situation such as a fire, explosion or leakage of toxic gas in buildings, underground passages, subway stations or the like. Referring to Figs. 3 to 5, each of the display devices 10 comprises semiconductor lasers 20 for generating laser light as a light source, an elongated light guide 30 for transmitting the laser light generated from the semiconductor lasers 20, a plurality of indicating marks 40 that are arranged along the length of the light guide 30 to have predetermined directionality and scatters and emits the laser light transmitted through the light guide 30, and a microcomputer 50 for controlling the operations of the semiconductor lasers 20. In this embodiment, each of the semiconductor lasers 20 is constructed of a p-n junction diode in which a p-type semiconductor of gallium (Ga) and an n-type semiconductor of arsenic (As) are joined to each other. Although Fig. 4 shows that two semiconductor lasers 20 are arranged at a trailing end of the light guide 30, the number of the semiconductor lasers 20 can be properly changed. The microcomputer 50 is configured to consecutively or periodically turn on/off the semiconductor lasers 20. Meanwhile, the light guide 30 of each of the display devices 10 is made of transparent, flexible materials such as polycarbonate and glass fiber. The light guide 30 is formed at the trailing end with holes 32 for receiving the semiconductor laser 20, and at a front end with a planoconvex lens 34 for focusing and emitting the laser light. The plano- convex lens 34 may be replaced with a plano-concave lens for diverging and emitting the laser light. The flexible light guide 30 can be bent and then conveniently installed at corners along the escape path as in the display devices 10-2, 10-5 and 10-8 shown in Fig. 1. The light guide 30 of Fig. 4 has a rectangular cross section, a light guide 30 of Fig. 6 has a circular cross section, and a light guide of Fig. 7 has a sectorial cross section. The cross section of the light guide 30 may be variously designed to have a triangular cross section, a pentagonal cross section, or the like. The light guide 30 with the sectorial cross section shown in Fig. 7 can be conveniently installed at a corner 2c between a ceiling 2a or a floor and a wall 2b constituting the escape path 1.

As shown in Figs. 4 and 5, the indicating marks 40 are formed inside the light guide 30. The indicating marks 40 can be marked with continuous dots that are cracks formed inside the light guide 30 by focusing laser light which has been generated from a known laser oscillator into the interior of the light guide through an optical system, and by moving the focus of the laser light in the light guide. Fig. 4 shows that the indicating marks 40 are marked in the form of arrows, and Fig. 6 shows that the indicating marks 40 are marked in the form of characters spelled of "EXIT". However, they are only illustrative and the indicating marks 40 are marked in the form of various symbols and characters. In this embodiment, the indicating marks 40 may be formed as indicating marks with patterns for diffracting visible rays by focusing the laser light generated from the laser oscillator into the light guide 30 to perform multi-photon absorption and by moving the focus of the laser light with an index of refraction varying due to the multi-photon absorption.

Figs. 8 and 9 show another example of the indicating mark. The indicating mark 40 of Figs. 8 and 9 consists of a corrugated part 42 for scattering and emitting the laser light transmitting through the light guide 30 toward the surface of the light guide 30. Although Fig. 9 shows that convex portions of the corrugated part 42 are in the form of a semicircle, the convex portions of the corrugated part 42 may be formed to take a triangular, polygonal or other shape. The corrugated part 42 may be formed by engraving the surface of the light guide 30 using the laser light from the laser oscillator. Further, the surface of the corrugated part 42 is coated with a fluorescent layer 44 for radiating light by means of the laser light.

Referring to Figs. 4, 5 and 7, surfaces of the light guide 30 through which the laser light is not required to be emitted, i.e. a back surface, a top surface and a bottom surface except the plano-convex lens 34 and a front surface through which the indicating marks 40 are viewed, are coated with reflection layers 36 for reflecting the laser light in order to improve efficiency by minimizing loss of laser light. The reflection layer 36 may be formed by spraying or attaching an aluminum thin film or a dielectric multi-layered thin film to the surface of the light guide 30. Referring to Figs. 4 and 6, the semiconductor 20 and the microcomputer 50 of each of the display devices 10 are mounted on a printed circuit board 60 that is contained in a housing 70 attachable to a wall surface of the escape path 1. The trailing end of the light guide 30 is coupled to an open end 72 of the housing 70, and a plurality of screws 76 are fastened into screw holes 38 formed at the trailing end of the light guide 30 through holes 74 of the housing 70, thereby firmly fixing the light guide 30 and the housing 70 to each other.

Referring to Fig. 3, power required for the operations of the semiconductor laser 20 and the microcomputer 50 of each of the display devices 10 is supplied by a power supply 80. The power supply 80 comprises a main power supply unit 82 for supplying main power used in a building or the like, an auxiliary power supply unit 84 for auxiliary power, and a power control unit 86 for controlling the power applied to the laser semiconductor 20 and the microcomputer 50 by the main power supply unit 82 and the auxiliary power supply unit 84. The auxiliary power supply unit 84 comprises a battery 88 contained in the housing 70 as shown in Figs. 4 and 6. The power control unit 86 recharges the battery 88 by using the power of the main power supply unit 82 when the power of the battery 88 is exhausted. Referring to Fig. 2, the system for guiding the escape paths according to the present invention comprises an emergency situation- sensing device 90 for sensing occurrence of an emergency situation such as a fire, smoke, leakage of toxic gas, or the like. The emergency situation- sensing device 90 includes a fire sensor 92 for sensing the occurrence of a fire, a smoke sensor 94 for sensing the occurrence of smoke, and a gas sensor 96 for sensing leakage of toxic gas. Further, the emergency situation-sensing device 90 includes an emergency button 98 that is operated by people to notify such an emergency situation.

The system for guiding the escape paths according to the present invention comprises a central computer 100 that is interfaced with the microcomputer 50 of each of the display devices 10 installed along the escape path 1 and controls the operations of the respective display devices 10 in response to signals inputted from the fire sensor 92, the smoke sensor 94, the gas sensor 96 and the emergency button 98 of the emergency situation-sensing device 90. The central computer 100 includes a microprocessor, an output device such as a monitor or printer, and an input device such as a keyboard. The central computer 100 is interfaced with a monitoring camera 102 of the emergency situation-sensing device 90 for allowing an operator to monitor occurrence of an emergency situation. The central computer 100 stores and processes a variety of data required for escape behaviors of people, including data on the escape path 1, data on the display devices 10, and the like. The central computer 100 is typically installed in a control room of a building or the like so that an operator can always monitor occurrence of an emergency situation. The operator can recognize the occurrence of an emergency situation by means of the monitoring through the monitoring camera 102, and input the occurrence of an emergency situation through the input device of the central computer 100. In this embodiment, instead of the central computer 100, a control means may comprise a controller for controlling the microcomputer 50 of each of the respective display devices 10 in response to signals inputted from the fire sensor 92, the smoke sensor 94, the gas sensor 96 and the emergency button 98 of the emergency situation-sensing device 90. This controller is useful for controlling the operations of the display devices 10 without any operator in a building or the like where it is difficult to provide a control room.

Fig. 10 shows another example of the display device according to the present invention. A display device 10' shown in Fig. 10 comprises a plurality of semiconductor lasers 20-1, 20-2, ... and 20-n (generally referred to as 20), a light guide 30, indicating marks 40-1, 40-2, ... and 40- n (generally referred to as 40), a microcomputer 50, a printed circuit board 60, a housing 70, and a power supply 80. The plurality of semiconductor lasers 20-1, 20-2, ... and 20-n (generally, 20) are accommodated in holes 32 formed on a top surface of the light guide 30 along the length thereof to individually correspond to the respective indicating marks 40-1, 40-2, ... and 40-n (generally, 40) provided along the length thereof.

The semiconductor lasers 20-1, 20-2, ... and 20-n (generally, 20), the light guide 30, the arrow-shaped indicating marks 40-1, 40-2, ... and 40-n (generally, 40), the microcomputer 50, the printed circuit board 60, the housing 70 and the power supply 80 of the display device 10' are basically identical with the semiconductor lasers 20, the light guide 30, the arrow- shaped indicating marks 40, the microcomputer 50, the printed circuit board 60, the housing 70 and the power supply 80 of the aforementioned display device 10 in view of their constitutions and operations. Therefore, detailed descriptions thereof will be omitted. Referring to Figs. 11 and 12, a system for guiding escape paths according to the present invention comprises a plurality of sub-display devices 12-1 to 12-5 (hereinafter, generally referred to as 12) for visually displaying escape directions along the first passage 1-1, the second passage 1-2 and the third passage 1-3 of the escape path 1 by receiving laser light emitted from the light guides 30 of the display devices 10-1, 10-2 and 10-3 (generally, 10). Each of the sub-display devices 12 comprises a light guide 30' for transmitting the laser light, a plurality of indicating marks 40' that are arranged along the length of the light guide 30' to have predetermined directionality and scatters and emits the laser light transmitted through the light guide 30', and a housing 70' to which a trailing end of the light guide 30' is coupled and which can be attached to a wall surface of the escape path 1. That is, each of the sub-display devices 12 is not equipped with the semiconductor lasers 20, the printed circuit board 60 and the battery 80 of the display device 10. As specifically shown in Fig. 12, the constitution and operation of the light guide 30' of each of the sub-display devices 12 are basically identical with those of the light guide 30 of the display device 10 from which the holes 32 for accommodating the semiconductor lasers 20 are eliminated. Therefore, a detailed description thereof will be omitted. The constitution of the housing 70' of each of the sub-display devices 12 is basically identical with that of the housing 70 of the display device 10. The housing 70' has both open ends 72 and 72' to allow the passage of the laser light.

As shown in Fig. 11, mirrors 14-1 and 14-2 (generally, 14) for reflecting the laser light are installed between the display devices 10-1 and 10-2 and the sub-display devices 12-1 and 12-2 to transmit the laser light emitted from the light guides 30 of the display devices 10-1 and 10-2 to the sub-display devices 12-1 and 12-2, respectively. The laser light emitted from the light guide 30 of the display device 10-3 sequentially passes through the sub-display devices 12-3 to 12-5.

Now, a method of guiding escape paths using the system for guiding the escape paths according to the present invention constructed as above will be described with reference to Fig. 13.

Referring again to Figs. 1 and 11, it is assumed that a first area A of a building provided with the first passage 1-1 of the escape path 1 is space where entry into and exit from the building are normally permitted but an emergency situation such as a fire, explosion, leakage of toxic gas has occurred. A second area B connected to the second passage 1-2 is inner space of the building to which it is impossible for people to escape, and a third area connected to the third passage 1-3 is space for permitting escape to the outside of the building using stairs, escape apparatuses or the like. Referring to Fig. 2, the occurrence of a fire, smoke and leakage of toxic gas in the first area A is sensed by the fire sensor 92, the smoke sensor 94 and the gas sensor 96 of the emergency situation-sensing device 90, respectively. Signals outputted from the fire sensor 92, the smoke sensor 94 and the gas sensor 96 of the emergency situation-sensing device 90 are inputted into the central computer 100. When a person that has recognized the occurrence of an emergency situation such as a fire, leakage of toxic gas, explosion, flooding or collapse in the building presses the emergency button 98, a signal outputted from the emergency button 98 is inputted into the central computer 100. Further, when an operator has recognized the occurrence of an emergency situation from the monitoring through the monitoring camera 102, he/she can operate the input device of the central computer 100 to input a signal of the emergency situation into the central computer 100. When the signal of the emergency situation outputted from the fire sensor 92, the smoke sensor 94, the gas sensor 96 or the emergency button 98 of the emergency situation-sensing device 90 and the signal of the emergency situation inputted through the input device have been input into the central computer 100 (S200), the central computer 100 determines whether an emergency situation has occurred, based on the signals outputted from the emergency situation-sensing device 90 (S202). If the central computer 100 determines that an emergency situation has occurred, it searches for an emergency area where the emergency situation has occurred by means of a program (S204). When the emergency area has been searched, the central computer 100 determines escape paths 1 so that people can most safely escape from the emergency area or do not enter the emergency area (S206). That is, as shown in Figs. 1 and 11, the central computer 100 determines escape paths 1 so that people staying in the first area A that is the emergency area can escape to the third area C through the first and third passages 1-1 and 1-3, and people staying in the second area B can escape to the third area C through the second and third passages 1-2 and 1-3.

Then, when the escape paths 1 have been determined, the central computer 100 transmits operating signals to the microcomputers 50 of the display devices 10 installed along the determined escape paths 1 so as to operate the semiconductor lasers 20 of the display devices 10, such that the indicating marks 40 of the display devices 10 can indicate the escape directions (S208). Now, a detailed description will be made with reference to Fig. 1. The display devices 10-7, 10-8 and 10-9 are operated so that people staying in the first area A can escape along the first and third passages 1-1 and 1-3, and the display devices 10-1, 10-2 and 10-3 are operated so that people staying in the second area B can escape along the second and third passages 1-2 and 1-3. The display devices 10-4, 10-5 and 10-6 of which the indicating marks 40 indicate an escape direction from the third area C to the first area A are not operated. Therefore, the people can quickly and safely escape along the escape paths 1 of which directions are indicated by the arrow-shaped indicating marks 40. If the semiconductor lasers 20 are periodically turned on and off under the control of the microcomputer 50, indication of the indicating marks 40 is dynamically performed. Thus, people can easily identify the escape paths 1 due to the periodic and dynamic indication of the indicating marks 40. In the escape path 1 shown in Fig. 1, the display device 10-2 of which the indicating marks 40 indicate the escape direction from the third area C to the first area A is not operated.

Meanwhile, if the signal of the emergency situation sensed from the fire sensor 92, the smoke sensor 94, the gas sensor 96 or the emergency button 98 of the emergency situation-sensing device 90 is inputted into a controller by a sensing means, the controller also operates only relevant display devices 10 installed along an escape path 1 through which people can most safely escape from an emergency area, in the same manner as the central computer 100.

Referring to Figs. 4 and 6, the laser light of the semiconductor lasers 20 is transmitted through the light guide 30 and simultaneously scattered and emitted by the indicating marks 40. Since the laser light emitted from the light guide 30 has high brightness, and superior directional and coherent properties, the people can easily identify the escape paths 1 displayed by the display devices 10 even in smoke or darkness. Referring to Figs. 8 and 9, the laser light of the semiconductor lasers 20 is transmitted through the light guide 30 and simultaneously scattered and emitted by the corrugated part 42. The emitted laser light makes the fluorescent layer 44 become brightly lit. Accordingly, the people can easily identify the display devices 10 in operation, and can quickly and safely escape along the escape paths 1 displayed by the display devices 10. Referring to Fig. 3, the microcomputer 50 of each of the display devices 10 determines whether main power is applied from the main power supply unit 82 (S210). If it is determined that the main power is not applied from the main power supply unit 82, the microcomputer controls the power control unit 86 so that the power of the auxiliary power supply unit 84 can be applied to the semiconductor lasers 20 (S212). When the emergency situation is terminated and it is directed to a safe situation, the operator inputs data on termination of the emergency situation through the input device of the central computer 100. The central computer 100 determines whether the emergency situation has been terminated (S214). If it is determined that the emergency situation has been terminated, the central computer 100 inputs a stop signal into the microcomputers 50 of the display devices 10 in operation. Each microcomputer 50 controls the power supply 80 to cut off the power applied to the semiconductor lasers 20. Thus, the operations of the display devices 10 are stopped (S216). Referring to Fig. 10, when the microcomputer 50 of each of the display devices 10 receives a signal of an emergency situation from the emergency situation-sensing device 90 or the central computer 100, it sequentially turns on and off the semiconductor lasers 20-1, 20-2, ... and 20-n (generally, 20). Laser light from a first semiconductor laser 20-1 is scattered by a first indicating mark 40-1, laser light from a second semiconductor laser 20-2 is scattered by a second indicating mark 40-2, and laser light from the last semiconductor laser 20-n is scattered by the last indicating mark 40-n. The indication of the indicating marks 40-1, 40-2, ... and 40-n (generally, 40) is dynamically performed by means of the sequential ON and OFF of the semiconductor lasers 20-1, 20-2, ..., 20-n (generally, 20). Since an escape direction is dynamically indicated by the indicting marks 40-1, 40-2, ..., 40-n (generally, 40) of the display device 10', the people can quickly and safely escape along an escape path 1 without going astray even in an emergency situation. Meanwhile, the semiconductor lasers 20-1, 20-2, ... and 20-n (generally, 20) of the display device 10' may be periodically turned on and off under the control of the microcomputer 50.

Referring to Figs. 11 and 12, when the escape directions along the escape paths 1 are visually displayed by the display devices 10, the sub- display devices 12 and the mirrors 14, it is possible to obtain the same effects as the visual display of the escape directions along the escape paths 1 using the aforementioned display devices 10 due to the high brightness, and superior directional and coherent properties of the laser light. With the construction of the system of the present invention using the mirrors 14 and the sub-display devices 12 from which the semiconductor lasers 20, the printed circuit boards 60 and the batteries 80 of the display devices 10 are eliminated, the structure of the system can be simplified, the number of parts can be greatly reduced, and installation thereof can be conveniently made. As a result, the system of the present invention can be constructed at a low cost. The aforementioned embodiments are merely illustrative and do not limit the scope of the present invention. Those skilled in the art can make various changes, modifications or substitutions thereto within the technical spirit and scope of the present invention defined by the appended claims. Such embodiments should be construed as falling within the scope of the present invention.

Industrial Applicability

With the system for guiding escape paths according to the present invention described above, the plurality of display devices are installed along the escape paths through which people can escape from an area where an emergency situation such as a fire, explosion or leakage of toxic gas has occurred, and the escape paths are visually displayed by means of the indicating marks provided along the respective light guides of the display devices. Therefore, it is possible to guide the people so that they can accurately escape along the safest and shortest ways. Further, since the people can easily identify the escape paths displayed by the display devices even in such an emergency situation, confusion in escape behaviors can be prevented, resulting in minimized toll on human. Moreover, there is an advantage in that the escape directions along the escape paths are dynamically displayed, thereby guiding a quick escape.

Claims

1. A system for guiding an escape path, comprising: a plurality of display devices installed along the escape path through which people can escape upon occurrence of an emergency situation, each of said display devices having a semiconductor laser for generating laser light, a light guide for transmitting the laser light generated from the semiconductor laser, a plurality of indicating marks arranged along the length of the light guide to scatter and emit the laser light transmitted through the light guide, and a microcomputer for controlling an operation of the semiconductor laser; an emergency situation-sensing means installed at the escape path to sense the occurrence of the emergency situation; and a control means interfaced with the microcomputers of said display devices to control the microcomputers of said display devices in response to a signal input from said emergency situation-sensing means.

2. The system as claimed in claim 1, wherein the indicating marks of said display devices are formed inside the light guide to have directionality capable of indicating an escape direction along the escape path.

3. The system as claimed in claim 1, wherein the indicating marks of said display devices consist of corrugated parts formed on a surface of the light guide to have directionality capable of indicating an escape direction along the escape path, and fluorescent layers are applied to surfaces of the corrugated parts.

4. The system as claimed in claim 1, wherein a plano-convex lens for emitting the laser light from the semiconductor laser is formed at a leading end of the light guide.

5. The system as claimed in claim 1, wherein each of said display devices further comprises reflection layers for reflecting the laser light from the semiconductor laser at surfaces of the light guide except a surface thereof through which the laser light from the semiconductor laser is emitted.

6. The system as claimed in claim 1, wherein a plurality of semiconductor lasers are mounted along the length of the light guide of each of said display devices such that each of the semiconductor lasers can respectively corresponds to each of the indicating marks.

7. The system as claimed in claim 6, wherein the microcomputers of said display devices is constructed to periodically turn on and off the semiconductor lasers, and said control means comprises a central computer provided within a control room.

8. The system as claimed in claim 6, wherein the microcomputers of said display devices is constructed to sequentially turn on and off the semiconductor lasers, and said control means comprises a central computer provided within a control room.

9. The system as claimed in claim 1, wherein said emergency situation-sensing means comprises a fire sensor for sensing the occurrence of a fire, a smoke sensor for sensing the occurrence of smoke, a gas sensor for sensing leakage of toxic gas, an emergency button capable of notifying the emergency situation, and a monitoring camera for allowing an operator to monitor the occurrence of the emergency situation.

10. The system as claimed in claim 1, further comprising a plurality of sub-display devices installed to visually display an escape direction along the escape path by receiving the laser light emitted from the light guides of said display devices, wherein each of the sub-display devices comprises a light guide for transmitting the laser light, and a plurality of indicating marks arranged along the length of the light guide to have directionality so as to scatter and emit the laser light transmitted through the light guide.

11. The system as claimed in claim 1, wherein mirrors for reflecting the laser light emitted from the light guides of said display devices are installed between said display devices and the sub-display devices so that the laser light can be transmitted to the light guides of the sub-display devices.