KR950001952Y1 - Emergency display lamp using solar cell in a street - Google Patents

Emergency display lamp using solar cell in a street Download PDF

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Publication number
KR950001952Y1
KR950001952Y1 KR92017283U KR920017283U KR950001952Y1 KR 950001952 Y1 KR950001952 Y1 KR 950001952Y1 KR 92017283 U KR92017283 U KR 92017283U KR 920017283 U KR920017283 U KR 920017283U KR 950001952 Y1 KR950001952 Y1 KR 950001952Y1
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South Korea
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solar cell
light emitting
case
cylindrical
light
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KR92017283U
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Korean (ko)
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KR940008428U (en
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박병호
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박병호
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
    • E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
    • E01F9/604—Upright bodies, e.g. marker posts or bollards; Supports for road signs specially adapted for particular signalling purposes, e.g. for indicating curves, road works or pedestrian crossings
    • E01F9/615—Upright bodies, e.g. marker posts or bollards; Supports for road signs specially adapted for particular signalling purposes, e.g. for indicating curves, road works or pedestrian crossings illuminated
    • E01F9/617—Illuminated or wired-up posts, bollards, pillars or like upstanding bodies or structures for traffic guidance, warning or control
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
    • E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
    • E01F9/604—Upright bodies, e.g. marker posts or bollards; Supports for road signs specially adapted for particular signalling purposes, e.g. for indicating curves, road works or pedestrian crossings
    • E01F9/619—Upright bodies, e.g. marker posts or bollards; Supports for road signs specially adapted for particular signalling purposes, e.g. for indicating curves, road works or pedestrian crossings with reflectors; with means for keeping reflectors clean
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S9/00—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply
    • F21S9/02—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply the power supply being a battery or accumulator
    • F21S9/03—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply the power supply being a battery or accumulator rechargeable by exposure to light
    • F21S9/037—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply the power supply being a battery or accumulator rechargeable by exposure to light the solar unit and the lighting unit being located within or on the same housing
    • 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
    • F21V23/004—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 arranged on a substrate, e.g. a printed circuit board
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/005—Illumination controller or illuminated signs including an illumination control system
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/16—Signs formed of or incorporating reflecting elements or surfaces, e.g. warning signs having triangular or other geometrical shape
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/20—Illuminated signs; Luminous advertising with luminescent surfaces or parts
    • G09F13/22—Illuminated signs; Luminous advertising with luminescent surfaces or parts electroluminescent
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F19/00—Advertising or display means not otherwise provided for
    • G09F19/22—Advertising or display means on roads, walls or similar surfaces, e.g. illuminated
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/16—Controlling the light source by timing means
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/20—Illuminated signs; Luminous advertising with luminescent surfaces or parts
    • G09F13/22—Illuminated signs; Luminous advertising with luminescent surfaces or parts electroluminescent
    • G09F2013/222—Illuminated signs; Luminous advertising with luminescent surfaces or parts electroluminescent with LEDs

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Architecture (AREA)
  • Accounting & Taxation (AREA)
  • Marketing (AREA)
  • Business, Economics & Management (AREA)
  • Geometry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Road Signs Or Road Markings (AREA)

Abstract

내용 없음.No content.

Description

태양전지를 이용한 점멸식 도로위험 표시등Blinking road hazard indicator using solar cell

제1도는 본 고안 표시등의 분리사시도.1 is an exploded perspective view of the light of the present invention.

제2도는 본 고안 표시등에 내장된 회로의 블럭다이어그램.2 is a block diagram of a circuit embedded in an indicator light of the present invention.

제3도는 제2도에서 보인 블럭다이어그램의 한 실시예를 나타낸 회로도.FIG. 3 is a circuit diagram illustrating one embodiment of the block diagram shown in FIG.

제4도는 본 고안 표시등의 사용상태예시도.4 is an example of the state of use of the light of the subject innovation.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 태양전지 2 : 태양전지케이스1: solar cell 2: solar cell case

PCB : 회로기판 4 : 발광다이오드PCB: Circuit Board 4: Light Emitting Diode

5 : 형광반사시트를 가진 원통형 케이스 7 : 축전지케이스5: cylindrical case with fluorescent reflection sheet 7: battery case

8 : 원통형발광케이스8: cylindrical light emitting case

본 고안은 태양전지를 이용한 점멸식도로위험 표시등에 관한것으로 특히 도로의 교통사고다발지역이나 급커브구간 또는 중앙 분리대나 철도건너목 도는 횡단 보도표시판등을 비롯한 각종 도로표시판이 부착되는 기둥위에서 구간에는 태양광선을 수광하여 전력을 얻고, 이 전력을 충전시켰다가 야간 또는 우천시나 농무시에는 다시말해서 운전자의 시계가 불량할때는 주기적으로 점멸함으로써 운전자의 시선을 모아 주의를 환기시켜 주어 교통사고를 미녕에 방지할수 있는 태양전지를 이용한 점멸식 도로위험표시등에 관한 것이다.The present invention relates to a flashing road hazard indicator using a solar cell, and particularly on a section where various road signs are attached, such as a road accident accident area, a sharp curve section, a central divider or a railroad crossing or a crosswalk sign. It receives power from the sun to get power, and charges this power, and at night, during rainy weather, or during farming, that is, when the driver's watch is poor, it blinks periodically to attract the driver's attention and draw attention to preventing traffic accidents. To a flashing road hazard indicator using solar cells.

종래에는 각종도로표시판이 운전자의 눈에 잘 보일수 있도록 재귀반사성시트와 같은 광반사체나 상용전력에 의해 점멸되는 전구를 사용했었기 때문에 광반사체의 경우 자동차의 전조등으로부터 조사되는 입사광선을 단순히 반사만하는 것이어서 원거리에서는 잘 식별할수 없는 폐단이 있었고, 상용전력용 전구의 경우 전력소모가 클뿐아니라 전구의 교체를 비롯한 유지보수비용이 많이 드는 폐단이 있었다.In the past, a light reflector such as a retroreflective sheet or a light bulb flickered by commercial power was used so that various road signs could be easily seen by the driver's eyes. Therefore, the light reflector simply reflects incident light emitted from the headlights of an automobile. There was a closed end that could not be distinguished from a long distance, and the commercial power light bulb had a high power consumption as well as a high cost of maintenance including replacement of the light bulb.

또 본 고안자의 선출원 고안인 실용신안출원 제92-12707호에는 태양전지를 전력공급원으로 이용하는 도로안전용 점멸신호장치가 제안된바 있으나, 운전자가 비교적 좁은 각도범위내에서만 쉽게 식별할수 있을뿐 전방향(全方向)에서의 식별기능이 없어 큰 효과를 발휘할수 없었다. 즉, 위험지역임을 주행방향을 달리하는 운전자가 한눈에 모두 식별할수 있도록 해주기에는 미흡한 단점이 있었다.In addition, Utility Model Application No. 92-12707, which is a predecessor of the present inventor, proposed a road safety flashing signal device using a solar cell as a power source, but the driver can easily identify only within a relatively narrow angle range. There was no discernment function in all of them, so it was not able to exert great effect. In other words, it was insufficient to allow the driver in different driving directions to identify the danger zone at a glance.

본 고안은 이와같은 종래것들의 제반문제점을 해결한 것인바, 본 고안의 목적은 운전자가 원거리에서도 위험지역임을 알려주는 표시판의 존재를 인식되게 할뿐아니라 더나아가 주행방향을 달리하는 차량의 운전자들이 모두 쉽게 인식할수 있도록 전방향으로 발광하는 태양전지를 이용한 점멸식 도로위험표시등을 제공하는데 있다.The present invention solves all the problems of the conventional ones, and the purpose of the present invention is not only to recognize the presence of a sign indicating that the driver is a dangerous area at a distance, but also to improve the driving direction of the vehicle driver. It is to provide a flashing road hazard indicator using solar cells emitting light in all directions for easy recognition.

이하 본 고안을 바람직한 예시도면에 의하여 더욱 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in more detail by way of example drawings.

제1도에는 본 고안의 분리사시도가 표현되어 있다. 제1도에서 도면 부호중 1은 태양전지이며, 2는 태양전지 보호케이스이고, 3은 수해나 열해로부터 장치내부의 각도를 보호하기위한 원통형케이스이며, 외주면에는 재귀반사성경면(3-1)이 형성되어 있고, 4는 발광소자인 발광 다이오드로서 여러개가 세로로 배치되어 있고 원거리에서도 식별이 용이한 적색의 고휘도 옥외용 발광다이오드이다. 5는 상기 발광다이오드(4)의 보호용 원통형케이스로서 외주면에는 상기 발광다이오드(4)의 점멸시 빛을 360°로 분산해주는 적색의 형광 반사시트(5-1)가 부착되어 있다.1 is an exploded perspective view of the present invention. In Fig. 1, reference numeral 1 denotes a solar cell, 2 denotes a solar cell protective case, 3 denotes a cylindrical case for protecting an angle inside the device from flooding or thermal damage, and a retroreflective mirror surface 3-1 on the outer peripheral surface thereof. 4 is a light emitting diode which is a light emitting element, and a red high brightness outdoor light emitting diode having a plurality of vertically arranged and easily distinguishable from a long distance. 5 is a protective cylindrical case of the light emitting diode 4, the outer circumferential surface of the light emitting diode 4 is attached with a red fluorescent reflective sheet 5-1 for dispersing light at 360 °.

6은 축전지이고, 7은 상기 축전지(6) 및 회로기판(PCB)을 보호하기위한 축전지 케이스이며, 8은 원통형발광케이스로서 외주면에는 세로방향의 홈(8-1)이 360°, 전방향에 걸쳐서 형성되어있어 원거리에서도 식별이 용이하도록 되어있다. 9는 도로상에 설치된 각종 도로표시판이 부착되는 지주(10)와 연결시킬때 이용되는 연결시킬때 이용되는 연결관이다.6 is a storage battery, 7 is a storage battery case for protecting the battery 6 and the circuit board (PCB), 8 is a cylindrical light emitting case, the longitudinal groove (8-1) in the outer circumferential surface 360 °, in all directions It is formed over, so that it can be easily identified from a long distance. 9 is a connector used to connect when used to connect with the support 10 is attached to the various road signs installed on the road.

제2도에는 본고안에 내장되는 회로의 블럭다이어그램으로서 도면 부호중 11은 광센서제어부, 12는 발진부, 그리고 13은 발광부를 표시한것이다.2 is a block diagram of a circuit embedded in this paper, in which numeral 11 denotes an optical sensor controller, 12 denotes an oscillator, and 13 denotes a light emitting portion.

도면중 미설명 부호 14는 도로표시판이다.Reference numeral 14 in the drawings is a road sign.

제3도는 제2도에서 보인 블럭다이어그램을 구체적으로 예시한 회로도로서 태양전지(1)에 빛이 입사될때 생기는 광전력을 감지하여 축전지(6)에 충전 또는 방전을 제어하는 광센서제어부(11)는 포토카플러(PT1), 다이오드(D1), 저항(R1∼R4) 및 트랜지스터(TR1)로 구성되어 있고, 발진부(12)는 트랜지스터(TR2, TR3), 저항(R5∼R8) 및 콘덴서(C1)(C2)로 구성되어 있으며, 발광부(13)은 여러개의 발광다이오드(LED1∼LED12)로 구성되어 있다.FIG. 3 is a circuit diagram specifically illustrating the block diagram shown in FIG. 2. The optical sensor controller 11 detects optical power generated when light is incident on the solar cell 1 and controls charging or discharging to the storage battery 6. Is composed of a photocoupler PT 1 , a diode D 1 , resistors R 1 to R 4 , and a transistor TR 1 , and the oscillator 12 includes transistors TR 2 and TR 3 , and resistor R. 5 to R 8 ) and condenser C 1 and C 2 , and the light emitting portion 13 is composed of a plurality of light emitting diodes LED 1 to LED 12 .

따라서 본 고안은 태양전지(1)로부터 광기전력이 발생되면 이 전력은 다이오드(D1)를 지나 전기적에너지로 변환되어 축전지(6)을 충전시킨다.Therefore, in the present invention, when photovoltaic power is generated from the solar cell 1, this power is converted into electrical energy through the diode D 1 to charge the storage battery 6.

이때 포트카플러(PT1)는 포트카플러(PT1) 부하저항(R1)을 통한 광기전력에 의해 포트카플러(PT1) 내부 입력발광다이오드가 발광하며 이때 빛이 입사했을때 생기는 광전류를 검출하고 접합부에 빛이 닿으면 전공과 전자가 분리하여 전류가 흘러 턴온이 된다.At this time, the port coupler PT 1 emits light by the input light emitting diode inside the port coupler PT 1 by photovoltaic power through the port coupler PT 1 load resistor R 1 . When light hits the junction, the electrons and electrons separate and turn on.

포터카플러(PT1)의 출력의 턴온된 전류는 포터카플러(PT1)의 부하저항(R2)을 통하여 트랜지스터(TR1)의 베이스 전류 제한저항(R3)을 통하여 트랜지스터(TR1)의 베이스에 공급하고, 이때 축전지(6)로 부터 공급된 전류는 트랜지스터(TR1)의 콜렉터 부하저항(R4)을 통해 공급될때 트랜지스터(TR1)의 콜렉터 및 에미터가 턴온하여 발진부(12)로의 전류공급을 차단하게 된다.Porter Coupler (PT 1) the current Porter Coupler (PT 1) of the load resistance transistors (TR 1) (R 2) through the transistor base current limiting resistor (R 3) of the (TR 1) through a turn-on of the output of the supplied to the base, at which time the current supplied from the battery (6) is a transistor collector load resistor (R 4) supplied when the transistor oscillation unit 12, to the collector and the emitter is turned on (TR 1) through the (TR 1) The current supply to the furnace will be cut off.

한편 포터카플러(PT1)에서 빛을 검출하지못할경우(야간, 우천시, 짙은 안개가 형성되었을때)에는 포터카플러(PT1)가 턴오프되고, 트랜지스터(TR1)가 오프되므로 축전지(6)로부터 전류가 흘러 저항(R4)을 통하여 발진부(12)에 전원이 공급된다.On the other hand, when the light is not detected by the porter coupler (PT 1 ) (in the night, in the rain, or when a heavy fog is formed), the porter coupler (PT 1 ) is turned off, the transistor (TR 1 ) is turned off because the storage battery (6) Current flows from the power supply to the oscillation unit 12 through the resistor R 4 .

여기서 다이오드(D1)는 축전지(6)로부터 태양전지(1)로의 전류역류를 방지하기 위한 것이다.Here, the diode D 1 is for preventing current backflow from the storage battery 6 to the solar cell 1.

광센서제어부(11)의 트랜지스터(TR1)의 콜렉터부하저항(R4)을 통해 축전지(6)로부터 전원이 공급되면 발진부(12)는 일정폭과 주기의 반복펄스를 발생하는 통상 비안정 멀티 바이브레이터로 작용하여 트랜지스터(TR2)(TR3), 저항(R5∼R8), 콘덴서(C1), (C2)의 조합에 의해 발진주기를 결정 발진을 아래와 같은 펄스폭과 반복주기로 반복하게 된다.When power is supplied from the storage battery 6 through the collector load resistor R 4 of the transistor TR 1 of the optical sensor control unit 11, the oscillator 12 generates an ordinary unstable multi that generates a repetitive pulse of a predetermined width and a period. The oscillation period is determined by the combination of the transistors TR 2 (TR 3 ), resistors R 5 to R 8 , capacitors C 1 , and C 2 , acting as a vibrator. Will repeat.

펄스폭 TW≒0.7(C2R7)Pulse width T W ≒ 0.7 (C 2 R 7 )

반복주기 TH≒0.7(C2R7+C1R5)Repetition period T H ≒ 0.7 (C 2 R 7 + C 1 R 5 )

상기 발진 펄스폭과 반복 주기에 따라 트랜지스터(TR3)의 콜렉터에서 출력 발광부(13)의 발광 다이오드(LED1∼LED12)는 상기 펄스 주기에 따른 연속점멸 동작을 반복하게 된다. 이와 같이 본 고안은 여러개의 발광다이오드(LED1∼LED12)가 점멸, 360°전방향에 걸쳐서 원거리에서도 인지, 식별이 용이하며, 주간에 광에너지를 전기에너지로 변환시켜 축전지에 축적되도록 한후 이를 야간 우천시 또는 짙은 안개가 형성되었을시에 활용하게 되므로 유지비용이 거의 안된다. 또한 발광다이오드(LED1∼LED12)는 반도체 일종으로 반영구적일 뿐아니라 발광다이오드(LED1∼LED12)와 적색의 형광반사시트(5-1)의 반사, 상승작용에 의해 우수한 시선집중효과를 얻을 수 있기 때문에 교통사고를 미연에 방지할수 있는 장점이 있다.According to the oscillation pulse width and the repetition period, the light emitting diodes LED 1 to LED 12 of the output light emitting unit 13 in the collector of the transistor TR 3 repeat the continuous flashing operation according to the pulse period. As described above, the present invention has several light emitting diodes (LED 1 to LED 12 ) flickering and easy to recognize and identify at a long distance over 360 °, and converts light energy into electrical energy during the day so that it accumulates in the battery. Maintenance costs are rare because it is utilized during rainy nights or when heavy fog is formed. In addition, the light emitting diodes (LED 1 to LED 12 ) are semi-permanent as a kind of semiconductor, and have excellent eye focus effect by the reflection and synergy effect of the light emitting diodes (LED 1 to LED 12 ) and the red fluorescent reflecting sheet 5-1. Since it can be obtained, there is an advantage that can prevent traffic accidents in advance.

Claims (2)

태양전지(1)의 케이스(2)와 조립되며 회로기판(PCB) 및 축전지(6)의 케이스(7)과 내장되는 원통형케이스(3)의 외주면에는 재귀반사성경면(3-1)을 형성하고, 여러개의 발광다이오드(4)를 세로로 연결시킨 발광체가 내장되는 원통형케이스(5)의 외주면에는 형광반사시트(5-1)를 부착하며, 이 원통형케이스(5)가 삽입되어 상기 원통형케이스(3)와 조립되는 원통형발광케이스(8)의 외주면에는 여러개의 세로 방향홈(8-1)을 전방향에 걸쳐서 형성시킨것임을 특징으로 하는 태양전지를 이용한 점멸식 도로위험표시등.A retroreflective mirror surface 3-1 is formed on the outer circumferential surface of the cylindrical case 3 which is assembled with the case 2 of the solar cell 1 and is embedded with the case 7 of the circuit board PCB and the storage battery 6. In addition, a fluorescent reflecting sheet 5-1 is attached to the outer circumferential surface of the cylindrical case 5 in which the light emitting bodies in which the plurality of light emitting diodes 4 are vertically connected are mounted, and the cylindrical case 5 is inserted into the cylindrical case. (3) on the outer circumferential surface of the cylindrical light emitting case (8) is a flashing road hazard indicator using a solar cell, characterized in that formed a plurality of longitudinal grooves (8-1) in all directions. 제1항에 있어서 여러개의 세로방향홈(8-1)이 형성되지 않은 외주면으로 된 원통형 발광케이스(8)로 구성된 태양전지를 이용한 점멸식 도로위험표시등.According to claim 1, Flashing road hazard indicator using a solar cell consisting of a cylindrical light emitting case (8) of the outer peripheral surface without a plurality of longitudinal grooves (8-1) formed.
KR92017283U 1992-09-09 1992-09-09 Emergency display lamp using solar cell in a street KR950001952Y1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100983350B1 (en) * 2008-03-19 2010-09-20 이상렬 Landscape street light

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200229869Y1 (en) * 1999-03-25 2001-07-03 지상열 Safety indicating device using solar-cell

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100983350B1 (en) * 2008-03-19 2010-09-20 이상렬 Landscape street light

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