WO1995030218A1 - Traffic road improved light-conduit system - Google Patents

Traffic road improved light-conduit system Download PDF

Info

Publication number
WO1995030218A1
WO1995030218A1 PCT/US1995/005247 US9505247W WO9530218A1 WO 1995030218 A1 WO1995030218 A1 WO 1995030218A1 US 9505247 W US9505247 W US 9505247W WO 9530218 A1 WO9530218 A1 WO 9530218A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
electric pulse
conduit system
pulse generator
flash
Prior art date
Application number
PCT/US1995/005247
Other languages
French (fr)
Inventor
Roberto Causin
Roberto Casalone
Original Assignee
Minnesota Mining And Manufacturing Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minnesota Mining And Manufacturing Company filed Critical Minnesota Mining And Manufacturing Company
Priority to AU23674/95A priority Critical patent/AU2367495A/en
Publication of WO1995030218A1 publication Critical patent/WO1995030218A1/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0096—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the lights guides being of the hollow type
    • 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
    • E01F9/20—Use of light guides, e.g. fibre-optic devices
    • 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
    • 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
    • E01F9/658—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by means for fixing
    • E01F9/669—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by means for fixing for fastening to safety barriers or the like

Definitions

  • the present invention relates to a method and an apparatus to improve the road traffic assistance by generating moving waves of light flash on a conti ⁇ nuous light conduit along a traffic road.
  • Such a light conduit system comprises a plurality of light conduit tubes, each tubes ha ⁇ ving a lamp at one end thereof, providing a continuous light line.
  • the light conduit tube comprises a thin, flexible film made of a suitable transparent material having a structured surface on one side and a smooth surface on the other side.
  • the performance of the light conduit can be manipulated so that the con ⁇ duit acts as an illuminator by permitting a controlled amount of light leakage.
  • the present invention relates to a light conduit system (1) for improved road traffic assistance comprising: a) a plurality of light conduits (2) disposed one after the other along their longitudi ⁇ nal axis, each of said light conduit being comprised of a plastic tube (4) having at one end thereof a light source (3) and at the other end a reflective cap, b) a power supply (10), c) a plurality of tension stabilizer (11) connected to the power supply in corre- spondence to each light source, d) an electric pulse generator (12), generating an electric pulse, and e) a flash device (13), connected to said tension stabilizer (11) and to said electric pulse generator (12) , which can supply the light source (3) with a different voltage depending on the electric pulse generated by said electric pulse gene- rator (12).
  • Figure 1 is a perspective view of the end portion of the light conduit tube provided with a light source.
  • Figure 2 is a perspective view of a light conduit tube installed on a New- Jersey control traffic system.
  • Figure 3 is a transverse section view of the light conduit tube.
  • Figure 4 is a longitudinal section view of the structured thin transparent film.
  • Figure 5 is a longitudinal section view of the light conduit tube.
  • FIG. 6 is a block diagram of the present invention.
  • Figure 7 is a schematic electronic diagram of the voltage stabilizer 11 of
  • the present invention relates to an improved light conduit system.
  • the light conduit system 1 com- prises a light conduit tube 2 having at one end thereof a light source 3 and at the other end thereof a reflective cap (not shown).
  • the light conduit tube 2 is comprised by a plurality of transparent plastic tube 4, such as, for example, a polycarbonate tube, connected with a sleeve (not shown).
  • a thin film 5 of transparent polymeric material is adhered to the internal wall 6 of the plastic tube 4.
  • the internal thin film 5 has a structured surface 7 and an opposite smooth surface 8.
  • the smooth surface 8 is adhered to the internal wall 6 of the transparent tube 4.
  • the structured surface 7 includes a linear array of miniature substantially right angled isosceles prisms arranged side-by-side to form a plurality of peaks and grooves.
  • the length of a single plastic tube can vary from 3 to 9 meters, preferably from 3 to 6 meters.
  • the total length of the light conduit tube is limited to 9-18 meters, preferably to 12-15 meters, in order to obtain a good luminance uniformity along the extension thereof.
  • Each light conduit tube is installed one after the other along its longitudinal axis so as to form a conti ⁇ nuous light guidance system along a traffic road. It can be installed on a guard-rail or other specific support means.
  • the perpendicular sides of the prisms make an angle of about 45° with the smooth surface, and when the film is curled the smooth surface lies in a smooth continuous arcuate curve without materially affecting the performance of the film.
  • incident light coming from the light source 3 and striking either of the surfaces 7 or 8 within certain angular ranges, will be totally reflected inter ⁇ nally.
  • the light will be totally reflected internally when the light refracted by the first surface strikes the second surface at an angle, with respect to the normal, greater than the critical angle.
  • the critical angle in air, is defined as the arc sin of the reci ⁇ procal of the refraction index of the material.
  • the thin film to be used in a light con ⁇ duit tube is manipulated by adding diffusing particles, or by incorporating windows or imperfections, such as non-optically smooth prism sides and/or non-optically sharp corners or peaks, so that the light conduit acts as an illuminator by permitting controlled light leakage.
  • a specific characteristic of the light conduit is that its luminance depends on the angle of the observer. The maximum of luminance is obtained with an angle of about 15°, and the luminance rapidly decreases with higher angles. At angles higher than 50° the luminance is reduced to about zero.
  • Other specific details about the above mentioned thin structured film can be found in the above men ⁇ tioned US 4,906,070 and 5,056,892.
  • the light source 3 can be any useful illuminating means able to be ex ⁇ posed to variable weather conditions.
  • a water-proof projector with a low tension halogen lamp (12 V, 50 W) is particularly useful.
  • a filter for obtaining a co ⁇ lored light emission such as, for example, a red light, a yellow light, and the like.
  • the light conduit system is provided with an electronic system which can generate a base voltage, so providing a base illuminance of the total light conduit, and a sequential pulse of additional voltage, so providing a moving waves of light flash along the light conduit.
  • the electronic system is schematically described in the block diagram of Figure 6. It comprises a power supply 10 and a pulse generator 12, both enclosed in a box A, a number n (depending on the length of the total device) of tension stabilizers 11, flash devices 13 and light sources 3 connected to said flash devices 13, all enclosed in a respective box Bn.
  • the power supply 10 is conveniently a low voltage DC battery (48 V), but a conventional 220 V, AC electric line can also be used.
  • the voltage stabilizer 11 al ⁇ lows to stabilize and reduce the voltage to about 10 to 15 V, preferably to about 12 to 14 V.
  • the stabilizer 11 allows to avoid the voltage fall due to the status of the battery charge and/or the length of the cable connection.
  • a schematic diagram of the stabilizer electronic circuit is described in Fig. 7. When the power supply pro ⁇ vides alternate current an additional rectifier can be conveniently added.
  • the pulse generator 12 can generate an electric pulse travelling along the plurality of flash devices 13, by means of a conventional cable connection, for the total length of the light conduit system of the present invention.
  • the pulse generator 12 is convenient ⁇ ly provided with a frequency control which allows to vary the pulse frequency, de ⁇ pending on the total length of the light conduit system and the desired duration of the light flash.
  • the duration of the light flash can be modified by the flash devices.
  • the flash devices 13 provide to the light sources 3 of the light conduit sy- stem a base voltage corresponding to about 60 to 80% of the maximum voltage, so providing a base luminance to the light conduit.
  • a specific example of light source is the Osram HalospotTM 111.
  • the reduction of the voltage can be obtained with a voltage variator inside to the flash devices 13.
  • the pulse generator 12 and the flash device 13 are well known in the art, and there are no specific requirements needed for the embodiment of the present invention.
  • An example of pulse genera- tor and flash device useful in the present invention is represented by the flash si ⁇ gnalling device LA 26, manufactured by Italflash Co.
  • the tension variator is by-passed, and the flash device provides to the corresponding light source the maximum output voltage.
  • the duration of this light flash can be varied from 0.1 to 2 seconds, prefer ⁇ ably from 0.5 to 1.5 seconds. After that, the voltage returns to the base value and the pulse is transferred to the following flash device.
  • a new pulse is generated by the pulse generator.
  • a second or more pulse can be generated before the first has reached the end of the light conduit.
  • the above described means for controlling the pulse frequency, the base voltage, and the duration of the light flash allow the apparatus of the present in ⁇ vention to be adapted to various situations encountered during work conditions, such as, for example, length of the road, different lightings, different weather con- ditions, and the like.
  • the visible result is a wave of light flash continuously travelling along the light conduit system.
  • This wave of light flash has been proved to be particularly ef ⁇ ficient in signalling a deviation of the normal path of a traffic road, even in condition of low visibility or along a road curve.
  • the specific characteristics of lumi- nance of the light conduit depending on the angle of the observer allows not to di ⁇ sturb the driver when he or she drives just laterally the light conduit system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Road Signs Or Road Markings (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

The present invention relates to a method and apparatus to improve the road traffic assistance by generating moving waves of light flash on a continuous light conduit along a traffic road. The apparatus of the invention comprises a light conduit system having a plurality of light conduits disposed one after the other along their longitudinal axis, each of said light conduit being comprised of a plastic tube having at one end thereof a light source and at the other end a reflective cap, a power supply, a plurality of tension stabilizers connected to the power supply in correspondence to each light source, an electric pulse generator, generating an electric pulse, and a flash device, connected to said tension stabilizer and to said electric pulse generator, which can supply the light source with a different voltage depending on the electric pulse generated by said electric pulse generator.

Description

Traffic Road Improved Light-Conduit System
FIELD OF THE INVENTION
The present invention relates to a method and an apparatus to improve the road traffic assistance by generating moving waves of light flash on a conti¬ nuous light conduit along a traffic road.
BACKGROUND OF THE ART
The problem of signalling to drivers the approaching to a zone causing a deviation of the normal traffic circulation, such as a work zone, a deviation zone, an interruption zone or any other dangerous situation is well known in the art.
This problem has been since now solved by a plurality of means. During daytime the indication of the deviation is usually made by means of signalling cones disposed along the road. During the night, a system of retroreflecting agents are usually disposed along the road for signalling the deviation. This system of re¬ troreflecting agents presents the disadvantage that the driver is advised of the de¬ viation only when the light of the driven vehicle strikes the retroreflecting agents. Moreover, in case of low visibility, for example due to fog formation the efficiency of this system is drastically reduced.
Another approach to solve the above mentioned problem during nighttime relates to employ a sequence of flash light lamps disposed along the deviation. The disadvantage of this system relates to the non-continuous characteristics of a set of single lamps and to the disturbance of a strong flash light lateral to the driver. Recently, a light conduit system has been introduced on the market. Such a light conduit system comprises a plurality of light conduit tubes, each tubes ha¬ ving a lamp at one end thereof, providing a continuous light line.
The light conduit tube comprises a thin, flexible film made of a suitable transparent material having a structured surface on one side and a smooth surface on the other side.
The performance of the light conduit can be manipulated so that the con¬ duit acts as an illuminator by permitting a controlled amount of light leakage.
A specific description of the materials and the specific construction of the light conduit can be found in US 4,906,070; 5,056,892 and 5,043,850. In spite of the good performance of the light conduit system known in the art, there is still the need of an improved system for signalling with specific effi¬ ciency and alert characteristics, a deviation from the usual traffic path along the road.
SUMMARY OF THE INVENTION
The present invention relates to a light conduit system (1) for improved road traffic assistance comprising: a) a plurality of light conduits (2) disposed one after the other along their longitudi¬ nal axis, each of said light conduit being comprised of a plastic tube (4) having at one end thereof a light source (3) and at the other end a reflective cap, b) a power supply (10), c) a plurality of tension stabilizer (11) connected to the power supply in corre- spondence to each light source, d) an electric pulse generator (12), generating an electric pulse, and e) a flash device (13), connected to said tension stabilizer (11) and to said electric pulse generator (12) , which can supply the light source (3) with a different voltage depending on the electric pulse generated by said electric pulse gene- rator (12).
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a perspective view of the end portion of the light conduit tube provided with a light source.
Figure 2 is a perspective view of a light conduit tube installed on a New- Jersey control traffic system.
Figure 3 is a transverse section view of the light conduit tube.
Figure 4 is a longitudinal section view of the structured thin transparent film.
Figure 5 is a longitudinal section view of the light conduit tube.
Figure 6 is a block diagram of the present invention.
Figure 7 is a schematic electronic diagram of the voltage stabilizer 11 of
Fig. 6. DETAILED DESCRIPTION OF THE INVENTION
As above mentioned, the present invention relates to an improved light conduit system. With reference to Fig. 1 and 2, the light conduit system 1 com- prises a light conduit tube 2 having at one end thereof a light source 3 and at the other end thereof a reflective cap (not shown).
The light conduit tube 2 is comprised by a plurality of transparent plastic tube 4, such as, for example, a polycarbonate tube, connected with a sleeve (not shown). As shown in Fig. 3, a thin film 5 of transparent polymeric material is adhered to the internal wall 6 of the plastic tube 4. As better shown in Fig. 4, the internal thin film 5 has a structured surface 7 and an opposite smooth surface 8. The smooth surface 8 is adhered to the internal wall 6 of the transparent tube 4. The structured surface 7 includes a linear array of miniature substantially right angled isosceles prisms arranged side-by-side to form a plurality of peaks and grooves. The length of a single plastic tube can vary from 3 to 9 meters, preferably from 3 to 6 meters. The shorter the plastic tube, the easier the transport and instal¬ lation, in particular along road curve, of the light conduit. The total length of the light conduit tube is limited to 9-18 meters, preferably to 12-15 meters, in order to obtain a good luminance uniformity along the extension thereof. Each light conduit tube is installed one after the other along its longitudinal axis so as to form a conti¬ nuous light guidance system along a traffic road. It can be installed on a guard-rail or other specific support means.
The perpendicular sides of the prisms make an angle of about 45° with the smooth surface, and when the film is curled the smooth surface lies in a smooth continuous arcuate curve without materially affecting the performance of the film. As shown in Fig 5, incident light coming from the light source 3 and striking either of the surfaces 7 or 8, within certain angular ranges, will be totally reflected inter¬ nally. The light will be totally reflected internally when the light refracted by the first surface strikes the second surface at an angle, with respect to the normal, greater than the critical angle. The critical angle, in air, is defined as the arc sin of the reci¬ procal of the refraction index of the material. The thin film to be used in a light con¬ duit tube is manipulated by adding diffusing particles, or by incorporating windows or imperfections, such as non-optically smooth prism sides and/or non-optically sharp corners or peaks, so that the light conduit acts as an illuminator by permitting controlled light leakage. - 4 -
A specific characteristic of the light conduit is that its luminance depends on the angle of the observer. The maximum of luminance is obtained with an angle of about 15°, and the luminance rapidly decreases with higher angles. At angles higher than 50° the luminance is reduced to about zero. Other specific details about the above mentioned thin structured film can be found in the above men¬ tioned US 4,906,070 and 5,056,892.
The light source 3 can be any useful illuminating means able to be ex¬ posed to variable weather conditions. A water-proof projector with a low tension halogen lamp (12 V, 50 W) is particularly useful. Between the halogen lamp and the internal of the plastic tube is conveniently interposed a filter for obtaining a co¬ lored light emission, such as, for example, a red light, a yellow light, and the like.
According to the present invention, the light conduit system is provided with an electronic system which can generate a base voltage, so providing a base illuminance of the total light conduit, and a sequential pulse of additional voltage, so providing a moving waves of light flash along the light conduit.
The electronic system is schematically described in the block diagram of Figure 6. It comprises a power supply 10 and a pulse generator 12, both enclosed in a box A, a number n (depending on the length of the total device) of tension stabilizers 11, flash devices 13 and light sources 3 connected to said flash devices 13, all enclosed in a respective box Bn.
The power supply 10 is conveniently a low voltage DC battery (48 V), but a conventional 220 V, AC electric line can also be used. The voltage stabilizer 11 al¬ lows to stabilize and reduce the voltage to about 10 to 15 V, preferably to about 12 to 14 V. The stabilizer 11 allows to avoid the voltage fall due to the status of the battery charge and/or the length of the cable connection. A schematic diagram of the stabilizer electronic circuit is described in Fig. 7. When the power supply pro¬ vides alternate current an additional rectifier can be conveniently added. The pulse generator 12 can generate an electric pulse travelling along the plurality of flash devices 13, by means of a conventional cable connection, for the total length of the light conduit system of the present invention. The pulse generator 12 is convenient¬ ly provided with a frequency control which allows to vary the pulse frequency, de¬ pending on the total length of the light conduit system and the desired duration of the light flash. The duration of the light flash can be modified by the flash devices. The flash devices 13 provide to the light sources 3 of the light conduit sy- stem a base voltage corresponding to about 60 to 80% of the maximum voltage, so providing a base luminance to the light conduit. A specific example of light source is the Osram Halospot™ 111. The reduction of the voltage can be obtained with a voltage variator inside to the flash devices 13. The pulse generator 12 and the flash device 13 are well known in the art, and there are no specific requirements needed for the embodiment of the present invention. An example of pulse genera- tor and flash device useful in the present invention is represented by the flash si¬ gnalling device LA 26, manufactured by Italflash Co.
When the electric pulse generated by the pulse generator 12 reaches the first flash device of the light conduit system, the tension variator is by-passed, and the flash device provides to the corresponding light source the maximum output voltage. The duration of this light flash can be varied from 0.1 to 2 seconds, prefer¬ ably from 0.5 to 1.5 seconds. After that, the voltage returns to the base value and the pulse is transferred to the following flash device. When the pulse has reached the last light source a new pulse is generated by the pulse generator. Alternatively, when the light conduit system is particularly long, a second or more pulse can be generated before the first has reached the end of the light conduit.
The above described means for controlling the pulse frequency, the base voltage, and the duration of the light flash allow the apparatus of the present in¬ vention to be adapted to various situations encountered during work conditions, such as, for example, length of the road, different lightings, different weather con- ditions, and the like.
The visible result is a wave of light flash continuously travelling along the light conduit system. This wave of light flash has been proved to be particularly ef¬ ficient in signalling a deviation of the normal path of a traffic road, even in condition of low visibility or along a road curve. Moreover, the specific characteristics of lumi- nance of the light conduit depending on the angle of the observer allows not to di¬ sturb the driver when he or she drives just laterally the light conduit system.

Claims

Traffic Road Improved Light-Conduit SystemCLAIMS
1. A light conduit system for improved road traffic assistance comprising: a) a plurality of light conduits (2) disposed one after the other along their longitu¬ dinal axis, each of said light conduit being comprised of a plastic tube (4) having at one end thereof a light source (3) and at the other end a reflective cap, b) a power supply (10), c) a plurality of tension stabilizer (11) connected to the power supply in correspon¬ dence to each light source, d) an electric pulse generator (12), generating an electric pulse, and e) a flash device (13), connected to said tension stabilizer (11) and to said electric pulse generator (12), which can supply the light source (3) with a different vol- tage depending on the electric pulse generated by said electric pulse generator
(12).
2. The light conduit system according to claim 1, wherein said electric pulse generator can generate a variable pulse frequency.
3. The light conduit system according to claim 1 , wherein said flash device can modify the time duration of the flash light.
4. A method for improving the road traffic assistance comprising the fol¬ lowing step: a) providing a light conduit system (1) comprising a plurality of light conduits (2) di¬ sposed one after the other along their longitudinal axis, each of said light con- duit being comprised of a plastic tube (4) having at one end thereof a light source (3) and at the other end a reflective cap, along a traffic road, b) providing a base voltage to said light conduit system, c) providing a pulse generator connected to said plurality of light sources trough a corresponding plurality of flash devices able to sequentially increase for a prede- termined period of time the voltage applied to each light source from said base voltage to a maximum voltage, so as to generate a moving wave of flash light through the light conduit system.
PCT/US1995/005247 1994-04-29 1995-04-26 Traffic road improved light-conduit system WO1995030218A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU23674/95A AU2367495A (en) 1994-04-29 1995-04-26 Traffic road improved light-conduit system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI940822A IT1271628B (en) 1994-04-29 1994-04-29 IMPROVED LIGHT GUIDE SYSTEM FOR VEHICLE TRAFFIC ROADS
ITMI94A000822 1994-04-29

Publications (1)

Publication Number Publication Date
WO1995030218A1 true WO1995030218A1 (en) 1995-11-09

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Family Applications (1)

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Country Status (3)

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AU (1) AU2367495A (en)
IT (1) IT1271628B (en)
WO (1) WO1995030218A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997037170A1 (en) * 1996-03-29 1997-10-09 Intekna S.R.L. Tubular light guide for linear lighting
WO1999050595A1 (en) * 1998-03-27 1999-10-07 Zimmermann Hans Peter Flashlight
EP1600559A1 (en) 2004-05-26 2005-11-30 3M Innovative Properties Company Carriageway-marking device and system
EP1955099A1 (en) * 2005-11-30 2008-08-13 3M Innovative Properties Company Light guide and illuminating fixture comprising it
EP2141521A2 (en) 2008-05-15 2010-01-06 LG Electronics Inc. Light pipe and illuminating device having the same
US8057073B2 (en) 2008-05-07 2011-11-15 Lg Electronics Inc. Light pipe and illuminating device having the same
US8075167B2 (en) 2008-05-20 2011-12-13 Lg Electronics Inc. Optical film and illuminating device having the same
US8789992B2 (en) 2008-05-08 2014-07-29 Lg Electronics Inc. Light pipe and illuminating device having the same
CN113077217A (en) * 2021-04-15 2021-07-06 北京京东乾石科技有限公司 Automatic scheduling method, system, device, equipment and storage medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1110108A (en) * 1964-11-16 1968-04-18 Elliott Brothers London Ltd Improvements relating to vehicle guidance systems
US3938080A (en) * 1974-06-03 1976-02-10 Kurt W. Thurston System for the programmed flashing of warning lights
WO1990004132A1 (en) * 1988-10-07 1990-04-19 Gulton Industries, Inc. Illuminating system
US5258896A (en) * 1992-06-04 1993-11-02 Minnesota Mining And Manufacturing Company Line light source

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1110108A (en) * 1964-11-16 1968-04-18 Elliott Brothers London Ltd Improvements relating to vehicle guidance systems
US3938080A (en) * 1974-06-03 1976-02-10 Kurt W. Thurston System for the programmed flashing of warning lights
WO1990004132A1 (en) * 1988-10-07 1990-04-19 Gulton Industries, Inc. Illuminating system
US5258896A (en) * 1992-06-04 1993-11-02 Minnesota Mining And Manufacturing Company Line light source

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997037170A1 (en) * 1996-03-29 1997-10-09 Intekna S.R.L. Tubular light guide for linear lighting
WO1999050595A1 (en) * 1998-03-27 1999-10-07 Zimmermann Hans Peter Flashlight
EP1600559A1 (en) 2004-05-26 2005-11-30 3M Innovative Properties Company Carriageway-marking device and system
WO2005118956A1 (en) * 2004-05-26 2005-12-15 3M Innovative Properties Company Carriageway-marking device and system
EP1955099A1 (en) * 2005-11-30 2008-08-13 3M Innovative Properties Company Light guide and illuminating fixture comprising it
EP1955099A4 (en) * 2005-11-30 2008-11-05 3M Innovative Properties Co Light guide and illuminating fixture comprising it
US8057073B2 (en) 2008-05-07 2011-11-15 Lg Electronics Inc. Light pipe and illuminating device having the same
US8789992B2 (en) 2008-05-08 2014-07-29 Lg Electronics Inc. Light pipe and illuminating device having the same
EP2141521A3 (en) * 2008-05-15 2010-03-03 LG Electronics Inc. Light pipe and illuminating device having the same
US7748874B2 (en) 2008-05-15 2010-07-06 Lg Electronics Inc. Light pipe and illuminating device having the same
EP2141521A2 (en) 2008-05-15 2010-01-06 LG Electronics Inc. Light pipe and illuminating device having the same
US8075167B2 (en) 2008-05-20 2011-12-13 Lg Electronics Inc. Optical film and illuminating device having the same
CN113077217A (en) * 2021-04-15 2021-07-06 北京京东乾石科技有限公司 Automatic scheduling method, system, device, equipment and storage medium

Also Published As

Publication number Publication date
IT1271628B (en) 1997-06-04
ITMI940822A1 (en) 1995-10-29
AU2367495A (en) 1995-11-29
ITMI940822A0 (en) 1994-04-29

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