KR101727562B1 - Light-emitting system of Induction Safety block - Google Patents

Light-emitting system of Induction Safety block Download PDF

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Publication number
KR101727562B1
KR101727562B1 KR1020150140444A KR20150140444A KR101727562B1 KR 101727562 B1 KR101727562 B1 KR 101727562B1 KR 1020150140444 A KR1020150140444 A KR 1020150140444A KR 20150140444 A KR20150140444 A KR 20150140444A KR 101727562 B1 KR101727562 B1 KR 101727562B1
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KR
South Korea
Prior art keywords
light
base
controller
block
blocks
Prior art date
Application number
KR1020150140444A
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Korean (ko)
Other versions
KR20170041021A (en
Inventor
배길한
손영민
김차곤
박석민
Original Assignee
주식회사 비투에스
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Priority to KR1020150140444A priority Critical patent/KR101727562B1/en
Publication of KR20170041021A publication Critical patent/KR20170041021A/en
Application granted granted Critical
Publication of KR101727562B1 publication Critical patent/KR101727562B1/en

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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C5/00—Pavings made of prefabricated single units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F21S2/005—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • F21V23/0442—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors
    • F21V23/0471—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors the sensor detecting the proximity, the presence or the movement of an object or a person
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
    • F21V33/0064—Health, life-saving or fire-fighting equipment
    • F21V33/0076—Safety or security signalisation, e.g. smoke or burglar alarms, earthquake detectors; Self-defence devices
    • H05B37/0227—

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Environmental & Geological Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Signs Or Road Markings (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

The present invention relates to a light emitting system that has an effect of coping with an electrical problem and a signal contradiction by using a block having excellent water resistance and durability. A base having a top space, a groove in the bottom edge, and a double-sided groove in the cross-section of the bottom center, and a vent hole in the ceiling in a cross-section; A light guide plate mounted in the space of the base; A light source installed in a mounting groove on one side of the light guide plate; And a covering layer covering the entire upper surface of the base from the upper surface of the base, wherein the coating layer is formed to reach the upper portion of the groove and the inside of the groove is sealed, A block; An electrical circuit for connecting the light sources of the blocks in parallel; A lighting signal detection sensor for sensing a lighting signal of a pedestrian signal light; A controller for simultaneously lighting or extinguishing the light sources of the blocks according to a lighting signal of the pedestrian signal lamp; A light controller which operates when a signal contradiction occurs in which two or more lighting signals are simultaneously applied to the controller, so that the light sources of the respective blocks are not emitted in either green or red; A SMPS for converting a commercial power source and supplying the same to a controller; And a fuse that is interposed between the controller and each of the blocks to intermittently supply power to each light source of the blocks.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a light-

The present invention relates to a light emitting system of a safety guiding block, which is easy to maintain and secure operation reliability by using a safety guiding block (hereinafter abbreviated as "block") excellent in water resistance and durability.

The block proposed in the present invention is a synthetic resin block installed on a sidewalk adjacent to a pedestrian crossing, in which the light emitting module including a light source and a light guide plate is embedded. The light emitting system is a system in which several light emitting blocks are arranged in a predetermined form and then the light source is tuned to a pedestrian signal light to emit light. The purpose of the installation of the above block is to enable a pedestrian to easily recognize a signal of a traffic light so as to reduce a traffic accident on a pedestrian crossing, and usually a braille projection for a visually impaired is formed on the upper surface.

A light emitting system of a general block (hereinafter, referred to as a 'conventional system') has a structure in which a plurality of blocks are installed in a checkerboard form or another form on a sidewalk adjacent to a crosswalk, and each light source in which the blocks are built is electrically connected in parallel , The green light of the traffic light, and the red light wire indirectly connect the current or magnetic field signal sensor. The lighting signal detection sensor is connected to a controller that receives conversion power from a Switching Mode Power Supply (SMPS) and controls light emission of the light source.

In the conventional system, when the green or red light of the signal lamp is turned on by the signal system, the light signal sensor detects the current or magnetic field of a power source such as a green power source or a red power source, And the light emission is controlled by a controller for obtaining a green light-on signal or a red light-on signal. In this case, when the green light or the red light is turned off, the power source to be sensed is cut off, and the green light emission of the light source is indispensable, but the red light emission may be selected depending on the installation environment of the block.

In such a conventional system, when an electrical problem (a short phenomenon, etc.) occurs in one of the plurality of blocks, all the blocks connected to the controller are turned off at the same time, so that it is very difficult to find an electrical problem block. This problem has caused another problem, such as an increase in the maintenance cost of the light emitting system, as well as wasted labor.

The conventional block used in the above-mentioned block light emitting system generally includes a base in which a light emitting module (a light source and a light guide plate) is built in; And a transparent or semitransparent upper surface (including protrusions or braille protrusions formed on the surface) covering the base.

Such a block should be sealed at the portion where the light emitting module is mounted, that is, inside the block. The reason for sealing is to prevent water (rainwater or the like) or dust from penetrating the inside of the block, which is a cause of electrical trouble, after the light emitting system is applied. If water or the like penetrates into the block, an electrical problem occurs immediately, resulting in a failure of the light source to emit light. Therefore, the quality of the block will depend on the degree of internal seal.

Now, in order to seal the inside of the block, a bonding boundary portion between the base and the upper surface, on which the light emitting module is installed, is attached using silicon or a high-strength adhesive (hot melt or the like). However, since the gastric sealing method is remarkably low in response to repeated temperature changes such as low temperature at a high temperature and high temperature at a high temperature, penetration of moisture or foreign matter is allowed in a relatively short time. If water or the like penetrates into the light emitting module, The lighting function of the pedestrian is often lost, and it is also vulnerable to external pressure (pedestrian's walking pressure, etc.), resulting in poor durability.

On the other hand, the above-mentioned sealing method requires a high-skilled attaching operation such as silicon and a drying time thereafter, and since the inspection process after attachment and drying is also required, it is difficult to manufacture the block and it can take a long time to mass- .

Also, when the light emitting module is embedded inside the block, the conventional block constrains the light source between one side of the light guide plate and the inside wall of the block. Such interference with the light source has been pointed out as a failure of the light source or a problem that the light source can not be arranged in a proper position (a problem that the light source is obliquely not horizontal in the side direction of the light guide plate) To the problem of causing ...

Korea Utility Model Registration No. 0436454 Korean Utility Model Registration No. 0470034

The object of the present invention is to provide a light emitting system in which when an electrical problem occurs in one of blocks during operation of a light emitting system, Block is prevented from being transferred to the block, and the problem block can be easily identified. In addition, the signal is not activated in the signal error of the signal.

Next, an object of the present invention is to prevent the incapability of the light source from being turned on due to moisture or the like by ensuring the completeness of the internal sealing, and to ensure high durability.

In the block light emission system according to the present invention, a space is formed on an upper portion, grooves formed on the bottom edge of the base and grooves formed on both sides by a transverse center of the bottom surface are connected, An upper open-type base on which at least one opening is formed; A light guide plate mounted in the space of the base; A light source installed in a mounting groove on one side of the light guide plate; And a covering layer covering the entire upper surface of the base from the upper surface of the base, wherein the coating layer is formed to reach the upper portion of the groove and the inside of the groove is sealed, A block; An electrical circuit for connecting the light sources of the blocks in parallel; A lighting signal detection sensor for sensing a lighting signal of a pedestrian signal light; A controller for simultaneously lighting or extinguishing the light sources of the blocks according to a lighting signal of the pedestrian signal lamp; A light controller which operates when a signal contradiction occurs in which two or more lighting signals are simultaneously applied to the controller, so that the light sources of the respective blocks are not emitted in either green or red; A SMPS for converting a commercial power source and supplying the same to a controller; And a fuse disposed between the controller and the blocks for interrupting a power source applied to each light source of the blocks.

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According to the present invention, the power source applied to each block of the block light emitting system can be interrupted, so that even if an electrical problem occurs in one of all the blocks, only the block in which the problem occurs is turned off. Accordingly, since the problem of stopping the operation of the light emitting system in operation due to one problem block (the entire light emitting system due to the problem block is turned off) can be fundamentally solved, the operation reliability of the block light emitting system can be maintained and improved . If a problem block occurs during the operation of the light emitting system, the identification of the problem block through the light off can be easily recognized, and it is possible to quickly deal with the problem block (repair or replacement) And the maintenance of the light emitting system is facilitated.

Further, since the present invention can completely block the blocks used in the block light emitting system, it is possible to solve the electrical problem caused by the sealed chamber. In addition, since the base and the upper surface of the block are integrated in the process of manufacturing the block, the durability of the block is remarkably improved. As a result, the block according to the present invention can achieve a perfect sealing and high durability, so that it is possible to obtain a block having an extended life span, and further, the mass production of the block can be expected, and the cost can be greatly reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a block light emitting system according to a first embodiment of the present invention; FIG.
FIG. 2 is an exemplary view showing the light-
Fig. 3 is an exemplary diagram showing Embodiment 2 of the block light emission system of the present invention
4 is a perspective view showing Embodiment 1 of the present invention,
(B) is a cross-sectional view of (A)
(C) is an example of extracting the bass from (b)
5 is a perspective view showing a second embodiment of the present invention (a)
(B) is an example of (a) incision in half
FIG. 6 is a block diagram of a second embodiment of the present invention.
7 is a bottom view of the second embodiment of the block of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which known configurations and related functions are omitted. In the drawings, the size of each element or a specific portion constituting the element is exaggerated, omitted, or schematically shown for convenience and clarity of explanation.

In the block light emitting system of the present invention, a plurality of (braille) protrusions are formed of the same material as the upper surface material on the translucent or transparent upper surface, and a light emitting module 130 having the LED light source 131 as a main component is embedded therein The present invention is based on a conventional block light emitting system in which two or more blocks 100 are arranged / installed on a vehicle, and the light sources 131 are electrically connected in parallel so that the light sources are simultaneously turned on and off. The embodiments of the present invention are as follows.

≪ Example 1 >

1 is a block diagram showing a block lighting system according to a first embodiment of the present invention. Referring to FIG. 1, a controller 400 turns on / off a light source 131 of the blocks 100, A light signal sensor 300 for applying the signal to the controller 400, an SMPS 500 for converting a commercial power supply to a controller 400, and a light source 131 for interrupting each light source 131 of the blocks 100 And then the light source 131 is turned on in green or red according to the alternate lighting of the signal lamp. When the red light is not allowed to be turned on in the block, the light signal detecting sensor must not be provided on the red wire (power cable) of the signal lamp, and the light source 131 in the block 100 is a translucent or transparent block 100) and is irradiated to the outside.

The lighting signal detection sensor 300 is indirectly coupled to a power line that applies power to the green and red lights of a pedestrian signal lamp, and then senses a current flowing to the electric wire or senses a magnetic field to generate a tuning signal. And clips in the form of metal clips.

The controller 400 controls the light emission of the light source 131 in accordance with the tuning signal of the lighting signal detection sensor 300 and includes a predetermined means for supplying or blocking the power supplied from the SMPS 500 to the block 100 For example, a logical arithmetic circuit and a switch on which an algorithm is mounted, which is also employed in a conventional light emitting system.

The fuse 600 is a conventional fuse that is melted and cut when a current larger than the anticipated current flows in the circuit to which the fuse is connected. The fuse 600 is installed between the controller 400 and each block 100, (Current) applied to the light source 131 is interrupted. Therefore, even if an electrical problem occurs in any one block due to moisture penetrated into the block, it is possible to prevent the stator electrical problem from being transferred (propagated) to another normal block due to the fuse 600. Therefore, by employing the fuse 600, it is possible to prevent the whole block of the light emitting system from being extinguished at a time due to an electrical problem of a part of the light emitting system.

On the other hand, in the light emitting system, when the two or more signals are simultaneously applied to the controller 400, the light controller (410) for preventing the light source (131) of each block (100) It can be prevented from operating on the signal contradiction of the traffic lights (see Fig. 2). Here, the signal contradiction refers to the case where the green and red lights of the traffic light are simultaneously lit.

≪ Example 2 >

Embodiment 2 (see FIG. 3) of the light emitting system is provided on a pedestrian crossing without a traffic light, and the lighting signal sensing sense 300 is changed to the pedestrian sensing sensor 310 in the first embodiment.

In the second embodiment, when the pedestrian reaches a block top surface or an adjacent block, the pedestrian detection sense 310 senses the pedestrian and transmits the signal to the controller 400. The controller 400, which receives the pedestrian sensing signal, The light sources 131 of the light sources 100 are turned on in green. This allows the driver to easily recognize that a pedestrian who wishes to traverse through a green-lit block is ready for crossing even if there is no traffic light on the pedestrian crossing, thereby minimizing nighttime pedestrian traffic accidents.

The pedestrian detection sensor 310 may detect a pedestrian when the pedestrian reaches the upper surface of the block, such as a pressure sensor for detecting the weight of the pedestrian or an infrared sensor for sensing the pedestrian's body or a position sense for detecting the position of the pedestrian, It is acceptable to adopt various types of sensors in addition to the wisens if it is a sense of recognizing the pedestrian.

Embodiments of the blocks used in the light emitting system of the present invention are as follows.

≪ Example 1 >

A light emitting module 130 including a light source 131 and a light guide plate 132 is installed in the interior of the block 100. The light emitting module 130 is formed on both sides of the block 100, (Not shown) for light emission of the light source 131, and two or more braille projections are formed on the upper surface.

In Embodiment 1, a base 110 is formed in a predetermined shape (generally rectangular shape), a space 112 is formed on a base, and both outlets are exposed to the outside of the base 110 at the bottom center of the base 110 And one or more exhaust holes 111 communicating with the space 112 are formed in the ceiling of the transverse passage 113. [ The light emitting module 130 including the light source 131 on one side and the light guide plate 132 on the plate is mounted in the space 112 of the upper open base 110 and the entire surface of the base 110 A coating layer 150 having a predetermined thickness is formed.

The base 110 is formed in a concave shape by an injection molding method, and a plurality of grooves are formed on the bottom surface for material saving and weight saving, and a cover layer 150 around the base is formed by molding the formed base 110 into a mold (Double injection) molding method, and the thickness thereof should be such that it is not damaged even if a pressure equal to or higher than the walking pressure of the pedestrian is applied. The exhaust hole 111 at the center of the bottom surface of the base 110 acts to prevent the coating layer 150 from being inflated when the coating layer 150 is formed on the entire surface of the base 110. After the coating layer 150 is formed Is impregnated with silicon or tightened with a bolt having an O-ring (not shown) so as to be completely sealed to maintain airtightness.

The light guide plate 132 of the light emitting module 130 is seated in the upper space 112 of the base 110 and the light source 131 is disposed on the side of the light guide plate 132. The light source 131 is disposed on the light guide plate 132) of the first and second mounting portions. In this manner, the light source 131 is embedded in the light guide plate 132, so that the light source 131 can be accurately positioned and set, and the light source 131 can be obliquely It is possible to solve problems such as breakage or the like.

≪ Example 2 >

The second embodiment is different from the first embodiment in that the grooves 120 are formed on the bottom edge of the base 110 in the first embodiment and grooves 120 'identical to the grooves 120 are formed on both sides of the transverse path 113 at the center of the bottom surface The grooves 120 and 120 'are connected to each other and the cover layer 150 of the base 110 is formed to cover the grooves 120 and 120' So that the coating layer 150 reaches the sidewall of the transverse passage 113.

The formation of the grooves 120 and 120 'on the bottom surface of the base 110 in the second embodiment is intended to stabilize the adhesion between the base 110 and the cover layer 150 so as to cancel the concerns about the unauthorized separation of both components. In addition, by forming two or more grooves 120 and 120 'so that the wall 121 is formed between the grooves and the grooves, only the boundary portion between the one covering layer 150 and the grooves 120 and 120' It is possible to prevent a phenomenon in which moisture penetrates, that is, a phenomenon in which electricity occurs due to an electric current (electric path: the flow of electricity generated due to moisture or the like introduced into the block), thereby solving the electric problem of the light source 131 due to the boundary portion will be.

The transverse passage 113 on the bottom surface of the base 110 functions to allow parallel connection of the wire when the block 100 is mounted on the ground, and also reduces the area of friction with the ground, So that it can be minimized.

In the first and second embodiments, the inside of the base 110 on which the light emitting module 130 is mounted can be completely sealed through the coating layer 150, so that penetration of moisture and the like into the block 100 is completely There is an action that can block.

In the first and second embodiments, a paper or synthetic resin paint plate 140 capable of transmitting light is placed between the light guide plate 132 and the cover layer 150, and when the light is emitted from the light guide plate 132, The visual sense of the block 100 can be improved by making the picture appear clearly.

First, a base 110 is formed by using an injection mold, and a light emitting module 130 is mounted on a space 112 of the molded base 110, And then the base 110 is injected into another injection mold and then the coating layer 150 is injection-molded on the surface of the base 110 to form a block 100 (the light emitting module is completely isolated from the outside) ). At this time, the material of the base 110 and the coating layer 150 are made the same. This is because the surface of the base 110 is (finely) melted by the liquid heat of the coating layer 150 supplied to the mold when the coating layer 150 is molded so that the coating layer 150 and the base 110 are thermally fused As shown in FIG.

The steps of forming the base 110 by forming the space 112 in the upper surface and forming the exhaust hole 111 in the center are as follows: Mounting a light emitting module (130) in a space of the base (110); The coating layer 150 may be formed on the surface of the base 110 by covering the entire surface of the base 110 on which the light emitting module 130 is mounted or the coating layer 150 may be formed on the bottom surface of the base 110 120 'so that the light emitting module is isolated inside the base.

The exhaust hole 111 of the base 110 is formed in the base 110 to be compressed by the introduction pressure when the movable mold is introduced into the stationary mold to form the coating layer 150 after the base 110 is inserted into the stationary mold. So that air existing in the space 112 of the cover layer 110 can be escaped, thereby preventing malformation of the cover layer 150.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as set forth in the following claims. Should belong to the scope of claims of the attached patent registration.

100: Block 110: Base
111: exhaust hole 112: space
113: transversal 120, 120 ': groove
121: wall 130: light emitting module
131: light source 132: light guide plate
133: mounting groove 140:
150: Coating layer 200: Electric circuit
300: lighting signal detection sensor 310: pedestrian detection sensor
400: controller 410: light controller
500: SMPS 600: Fuse

Claims (9)

A groove 120 formed on the bottom edge of the base 110 and a groove 120 'formed on both sides of the transverse passage 113 at the center of the bottom surface are connected to each other and the transverse passage 113 (110) in which at least one exhaust hole (111) communicating with the space (112) is formed in a ceiling of the upper opening type base (110); A light guide plate 132 mounted in the space 112 of the base 110; A light source 131 installed in the mounting groove 133 on one side of the light guide plate 132; The cover 120 is formed of a cover layer 150 covering the entire surface of the base 110 from the upper surface of the base 110. The cover 120 may be formed to cover the grooves 120 and 120 ' At least two waterproof blocks (100) for sealing the inside of the exhaust hole (111) and sealing the exhaust hole (111) after the covering layer (150) is formed;
An electric circuit (200) for connecting the light sources (131) of the blocks (100) in parallel;
A lighting signal detection sensor 300 for sensing a lighting signal of a pedestrian signal lamp;
A controller 400 for simultaneously lighting or extinguishing the light sources 131 of the blocks 100 according to a lighting signal of the pedestrian signal lamp;
A light controller 410 which operates when a signal contradiction occurs in which two or more lighting signals are simultaneously applied to the controller 400 to prevent the light source 131 of each block 100 from emitting light either green or red, ;
An SMPS 500 for converting a commercial power source and supplying it to the controller 400;
And a fuse 600 installed between the controller 400 and each of the blocks 100 to intermittently supply power to each of the light sources 131 of the blocks 100.
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KR1020150140444A 2015-10-06 2015-10-06 Light-emitting system of Induction Safety block KR101727562B1 (en)

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Application Number Priority Date Filing Date Title
KR1020150140444A KR101727562B1 (en) 2015-10-06 2015-10-06 Light-emitting system of Induction Safety block

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KR101727562B1 true KR101727562B1 (en) 2017-04-17

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Publication number Priority date Publication date Assignee Title
KR102271279B1 (en) * 2019-04-22 2021-06-30 홍요셉 Crosswalk signal display system using luminous braille block
KR102202401B1 (en) * 2020-10-28 2021-01-13 엘컴텍 주식회사 Controll method and system for floor traffic light
KR102602106B1 (en) * 2021-09-02 2023-11-14 엘컴텍 주식회사 Floor traffic light device and control method thereof
KR102602104B1 (en) * 2021-09-02 2023-11-14 엘컴텍 주식회사 Floor traffic light device and error handling method thereof
KR102528010B1 (en) * 2022-10-31 2023-05-02 (주)경동이앤에스 Surface-Emitting Floor Traffic Light System with Voice Guidance Function and Failure Notification Function

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KR200297394Y1 (en) * 2002-09-18 2002-12-11 이인국 A studded paving blok made of synthetic resin
KR200436454Y1 (en) * 2006-10-09 2007-08-22 배길한 Sidewalk block with lighting means
KR100928740B1 (en) * 2009-05-25 2009-11-27 (주) 에스엘테크 Raised letters block system having emitting light function

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JP4642160B2 (en) 1995-12-15 2011-03-02 モンサント・カンパニー Methods for controlling improved rheological properties in cementitious systems.
KR100436454B1 (en) 2002-06-01 2004-06-22 주식회사 케이디엔스마텍 Machine for automatically issuing card and passport for financial deal and identification of user using biometrics technology

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200297394Y1 (en) * 2002-09-18 2002-12-11 이인국 A studded paving blok made of synthetic resin
KR200436454Y1 (en) * 2006-10-09 2007-08-22 배길한 Sidewalk block with lighting means
KR100928740B1 (en) * 2009-05-25 2009-11-27 (주) 에스엘테크 Raised letters block system having emitting light function

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