EP2488401A1 - Led-type luminous signaling device and relative control method - Google Patents
Led-type luminous signaling device and relative control methodInfo
- Publication number
- EP2488401A1 EP2488401A1 EP10798582A EP10798582A EP2488401A1 EP 2488401 A1 EP2488401 A1 EP 2488401A1 EP 10798582 A EP10798582 A EP 10798582A EP 10798582 A EP10798582 A EP 10798582A EP 2488401 A1 EP2488401 A1 EP 2488401A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- luminous
- led
- type
- signaling
- light
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 230000011664 signaling Effects 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims description 8
- 230000005855 radiation Effects 0.000 claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims abstract description 13
- 238000012545 processing Methods 0.000 claims description 7
- 230000006870 function Effects 0.000 description 5
- 230000007257 malfunction Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000009131 signaling function Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
- B61L5/12—Visible signals
- B61L5/18—Light signals; Mechanisms associated therewith, e.g. blinders
- B61L5/1809—Daylight signals
- B61L5/1881—Wiring diagrams for power supply, control or testing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
- B61L5/12—Visible signals
- B61L5/18—Light signals; Mechanisms associated therewith, e.g. blinders
- B61L5/1809—Daylight signals
- B61L5/1845—Optical systems, lenses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L2207/00—Features of light signals
- B61L2207/02—Features of light signals using light-emitting diodes [LEDs]
Definitions
- the present invention concerns a LED-type luminous signaling device used, for example but not only, in traffic-light apparatuses.
- the luminous signaling device according to the present invention is preferentially used in traffic-light apparatuses to regulate rail or road traffic, whether driven manually or automatically.
- the luminous signaling device according to the present invention can also be applied to other types of signaling apparatuses, such as signaling buoys, signaling devices for electric pylons or cables, or public lighting devices.
- the device according to the invention is applied in cases where it is desired to guarantee a great safety in the correct functioning of luminous signaling systems, in order to prevent accidents or dangerous situations for persons or things.
- the invention also concerns the connected control method.
- LED-type luminous elements both because the light emitted is more direct and coherent, and also because they last longer and have lower electric consumption,, given the same light emitted, compared with traditional lamps.
- Another advantage of LED-type luminous elements is that given by their nature as multi-point emitter, so that they can continue to carry out their function even when there is a breakage and/or malfunction in some of the elements.
- LED technology Since it is more complex than the filament of a bulb, LED technology has a lot of cases of breakdowns, for example an open LED, a short-circuited LED, low light emission, or others.
- LED technology since it is multi-source, allows to keep the device in an operating state even in the event of one or more elementary LED sources not functioning. Indeed there are different techniques to guarantee full functioning even in poor conditions, such as for example the use of current shunt to the heads of broken LEDs, increasing the pilot current on LEDs that are still whole, or others. However, in this case too, as we said before, it is difficult to detect reliable diagnostic data based on the detection of the functioning electric quantities of the LEDs.
- Purpose of the present invention is to achieve a LED-type luminous signaling device used preferably, but not only, in traffic-light apparatuses, which makes the functioning diagnostics reliable, detecting and signaling possible malfunctions, even partial, such as breakages or considerable reductions in the luminous radiation emitted.
- the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
- a LED-type luminous signaling device comprises one or more LED-type luminous emission sources and at least a light-directing lens suitable to diffuse the luminous radiation emitted by a corresponding LED-type luminous emission source in at least one signaling direction.
- the light- directing lens is conformed so as to define at least an interception portion suitable to divert a predefined fraction of total luminous radiation emitted by each LED- type luminous emission source in one or more control directions different from the signaling direction.
- the signaling device comprises optical detection means disposed coherent with a corresponding control direction so as to detect said predefined fraction of luminous radiation diverted by the interception portion.
- the LED-type luminous emission source or sources emit luminous radiation on the same wavelength.
- the LED-type luminous emission sources are divided into two or more groups, uniformly distributed on a single support, each group being able to be alternately activated and suitable to emit luminous radiation at a determinate wavelength. In this way, by selectively controlling the activation of each group of LED-type luminous emission sources it is possible to emit a luminous radiation of the desired color, for example red, amber or green, or to provide that all the LED-type luminous emission sources are the same color, thus being able to activate the groups alternately, allowing to increase the operating duration of the device.
- the signaling device comprises control and processing means, connected to the optical detection means, to acquire the detection data and to calculate the quantity of luminous radiation emitted over all.
- the device comprises an electric load, or fictitious load, able to be selectively activated according to the detection of the quantity of light emitted over all and detected by the optical detection means.
- an electric load or fictitious load, able to be selectively activated according to the detection of the quantity of light emitted over all and detected by the optical detection means.
- the one or more light- directing lenses comprise darkening portions, suitable to absorb incident light from outside the signaling device. In this way it is possible to prevent detection errors by the detectors, produced for example by a high level of incident ambient light on the light-directing lens or lenses.
- - fig. 1 is a view from above of a LED-type luminous signaling device according to the present invention
- - fig. 2 is a perspective schematic view of a detail of the device in fig. 1 ;
- - fig. 3 is an enlarged lateral schematic view of a detail of fig. 2; - fig. 3 A is an enlarged view of a detail in fig. 3;
- - fig. 3B is a view from above of fig. 3A;
- - fig. 4 is a functional block diagram of the device in fig.1.
- a LED-type luminous signaling device 10 is advantageously used in a traffic- light apparatus, not shown in the drawings, used for example to regulate rail traffic.
- the device 10 comprises a support 12, provided with a plurality of light- directing lenses 14 made in a single piece with the support 12.
- the support 12 is made by molding in plastic or polymer material, for example polycarbonate.
- the support 12 is stably coupled with an electronic card 13, or PCB (Printed Circuit Board), on which a plurality of LED-type luminous sources 16 are mounted, each associated with a corresponding light-directing lens 14, and a plurality of photo- detectors 17.
- PCB Print Circuit Board
- the support 12 and the electronic card 13 are similar in shape, in this case substantially circular, able to allow them to be stably inserted in a containing structure of the traffic-light apparatus.
- the LED-type luminous sources 16 are mounted on the electronic card 13, in a predetermined disposition consistent with the disposition of the light-directing lenses 14 on the support 12, so as to define an effective area of light emission, substantially concentrated in correspondence with the light-directing lenses 14.
- the light-directing lenses 14 comprise a collimation portion 22 (fig. 3), disposed below the lens 14 and suitable to collimate in a single direction, or signaling direction, the luminous radiations emitted by an associated LED-type luminous source 16 in different directions.
- the signaling direction is perpendicular to the plane identified both by the electronic card 13 and also by the upper surface of the support 12.
- the light-directing lens 14 also comprises an exit portion 24, substantially flat, circular in shape, made on an upper face of the support 12. From the exit portion 24 the luminous radiations of the LED-type luminous sources 16 are emitted toward the outside in the signaling direction.
- the light-directing lenses 14 are grouped together in modules 15 of three (fig. 2), in a regular disposition, in which the center of each light-directing lens 14 of the same module 15 is positioned in correspondence with the tops of an equilateral triangle and the corresponding exit portions 24 are reciprocally tangent in pairs. This modular disposition is repeated continuously and regularly over the whole support 12.
- Each light-directing lens 14 of the same module 15 is associated with an underlying LED-type luminous source 16 of a different color.
- the corresponding triad of LED-type luminous sources 16 is able to be activated alternately, so as to switch them on one at a time, and thus to emit from the device 10 a luminous radiation of the desired color.
- the LED-type sources 16 can be the same type, that is, they can emit luminous radiation on the same wavelength, corresponding to a single color, in this case achieving a signaling device having a single signaling function, and in which all the LED-type sources 16 are activated simultaneously, or alternatively one LED-type source 16 at a time, so as to prolong the duration of operative functioning of the device 10.
- the interception portion 18 has a circular shape, common to the three light-directing lens 14 of the same module 15.
- the interception portion 18 comprises an interception prism 19 (figs. 2 and 3) of the total reflection type, having an inclination of about 45 degrees with respect to the flat upper surfaces of the exit portion 24 and the interception portion 18, and a circular surface development.
- the interception prism 19 is suitable to intercept the predefined fraction of light emitted by the LED-type sources 16 associated with the module 15 and to reflect it in a direction substantially parallel to the flat surfaces of the interception portion 18 and the exit portion 24, that is, perpendicular to the signaling direction.
- the length of the interception prism 19, and hence the thickness of the interception portion 18 with respect to the exit portion 24, is made both as a function of the wavelength of the luminous radiations emitted, and also as a function of the predefined fraction of luminous radiation to be intercepted.
- the predefined fraction of luminous radiation to be intercepted is around one per cent.
- the interception portion 18 also comprises a reflection prism 20, again of the total reflection type, disposed in a central position with respect to the interception portion 18.
- the reflection prism 20 is suitable to reflect the fraction of luminous radiation intercepted by the interception portion 19 toward an area of the electronic card 13, central with respect to the three light-directing lenses 14, in correspondence with which area the associated photo-detector 17 is mounted.
- the reflection prism 20 is substantially shaped conical, with the lateral surface inclined by about 45 degrees with respect to the upper flat surface of the interception portion 18.
- the signaling device 10 also comprises a processing and control unit 30, directly connected both to the photo-detectors 17 and also to the LED-type sources 16.
- the processing and control unit 30 is suitable to switch on the LED-type sources 16, based on a command received for example from remote, and also to acquire the data relating to the fraction of luminous radiation detected by the photo- detectors 17 and then to calculate the total luminous radiation emitted by the device 10.
- the processing and control unit 30 can be a microprocessor of a known type, typically used in electronic devices.
- the device 10 comprises a fictitious electric load 32, connected to the control unit 30, able to be selectively driven by it according to the detection of total luminous radiation emitted by the device 10 and calculated by means of the detection of the corresponding fraction intercepted by the photo-detectors 17.
- the load 32 is switched on or off according to the real functioning state of the device 10, which allows to signal any functioning anomaly, for example detected remotely, as if the signaling device were actually provided with a traditional type lamp.
- modules 15 of the device 10 are not provided with the interception portion 18, inasmuch as the light they emit is not sent in the signaling direction but is intercepted outside the device 10 by a front shield of the traffic-light apparatus, not shown. This light is diverted toward the bottom of the traffic-light apparatus so as to allow the operators responsible for maintenance to inspect the actual functioning state visually.
- At least part of the support 12 comprises darkening portions 26, in which the plastic material is made opaque in correspondence with the spaces between the modules 15. This is to absorb the external light incident on the signaling device 10 and therefore to prevent external ambient luminous radiation being detected by the photo-detectors 17, which is not wanted.
- the LED-type signaling device 10 as described heretofore functions as follows.
- the signaling device 10 When the signaling device 10 is switched on, that is, when a first group of LED-type luminous sources 16 corresponding to the desired color is activated, a plurality of rays R' emitted by each LED-type source 16 in different directions is collimated by the collimation portion 22 into corresponding rays R" in the signaling direction.
- the rays R" are sent, inside the light-directing lens 14, toward the exit portion 24, striking it perpendicularly and coming out as rays emitted Re in the signaling direction.
- the rays Rc" are propagated along the surface of the interception portion, substantially radially toward the center of the module 15 as far as the interception prism 20, in correspondence with which they are further reflected, totally, into corresponding control rays Rc" ' toward the corresponding photo-detector 17 disposed on the electronic card 13.
- the processing and control unit 30 acquires in a known manner the luminous radiation detected by each photo-detector 17, calculating the luminous radiation emitted overall by the device 10, according to the known and predefined percentage of the interception fractions of the interception prisms 19.
- the detection of the luminous radiation captured by the photo-detectors 17 does not refer to an absolute emission value, but to a relative value corresponding to a stream of light specifically defined for each optical group.
- the calibration of the threshold level below which the malfunction is signaled allows to keep in consideration all the constructional variables of the signaling device 10, both mechanical and electrical, which can influence the stream of light actually emitted.
- the device 10 activates an anomaly or breakdown signal, such as for example switching off the fictitious load 32, therefore allowing the remote detection of the functioning anomaly by a traffic control center.
- the signal can be done in a different way, for example by sending a message through a suitable communication network, by a wave conveyed on the electric feed line of the traffic-light apparatus.
- each module 15 is associated with a pair of photo-detectors 17, independent of each other, so as to guarantee a greater functioning reliability and detection efficiency.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Selective Calling Equipment (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITUD2009A000184A IT1396088B1 (en) | 2009-10-16 | 2009-10-16 | LUMINOUS LED SIGNALING DEVICE AND ITS CONTROL PROCEDURE |
PCT/IB2010/002625 WO2011045663A1 (en) | 2009-10-16 | 2010-10-15 | Led-type luminous signaling device and relative control method |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2488401A1 true EP2488401A1 (en) | 2012-08-22 |
EP2488401B1 EP2488401B1 (en) | 2013-08-07 |
EP2488401B2 EP2488401B2 (en) | 2017-07-12 |
Family
ID=42697428
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10798582.2A Active EP2488401B2 (en) | 2009-10-16 | 2010-10-15 | Led-type luminous signaling device and relative control method |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2488401B2 (en) |
IT (1) | IT1396088B1 (en) |
WO (1) | WO2011045663A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3480078A1 (en) * | 2017-11-07 | 2019-05-08 | Siemens Schweiz AG | Light signal for displaying signal terms for a traffic route |
AU2016412473B2 (en) * | 2016-06-27 | 2019-10-31 | Siemens Mobility Inc. | Monitoring system, wayside LED signal, and method for monitoring a wayside LED signal |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102011084590A1 (en) * | 2011-10-17 | 2013-04-18 | Zumtobel Lighting Gmbh | lamp |
US8960969B2 (en) | 2012-09-28 | 2015-02-24 | Lsi Corporation | Semiconductor structure with waveguide |
WO2022058425A1 (en) * | 2020-09-21 | 2022-03-24 | Signify Holding B.V. | An illumination system, a lens panel for such illumination system and a method for realizing such lens panel |
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GB9708861D0 (en) †| 1997-04-30 | 1997-06-25 | Signal House Limited | Traffic signals |
DE19744209A1 (en) †| 1997-09-30 | 1999-04-01 | Siemens Ag | Multiple light emitting diode testing method for traffic light |
DE19744210A1 (en) †| 1997-09-30 | 1999-04-01 | Siemens Ag | Multiple light emitting diode testing method for traffic light |
ATE285103T1 (en) * | 1998-07-23 | 2005-01-15 | Siemens Ag | LIGHT SIGNAL SYSTEM AND METHOD FOR MONITORING THE LIGHT SIGNAL SYSTEM |
FR2809162B1 (en) †| 2000-05-18 | 2002-07-26 | Sagem | ILLUMINATION SYSTEM WITH FAILURE DETECTION |
US6614358B1 (en) * | 2000-08-29 | 2003-09-02 | Power Signal Technologies, Inc. | Solid state light with controlled light output |
FI115250B (en) * | 2000-12-13 | 2005-03-31 | Sabik Ab Oy | Monitoring and control equipment for traffic lights |
US6741351B2 (en) †| 2001-06-07 | 2004-05-25 | Koninklijke Philips Electronics N.V. | LED luminaire with light sensor configurations for optical feedback |
DE10355878B3 (en) †| 2003-11-25 | 2005-08-25 | Siemens Ag | light signal |
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US7165896B2 (en) †| 2004-02-12 | 2007-01-23 | Hymite A/S | Light transmitting modules with optical power monitoring |
US7154403B2 (en) * | 2004-06-30 | 2006-12-26 | General Electric Company | Apparatus and method for monitoring the output of a warning or indicator light |
US7893632B2 (en) †| 2004-11-19 | 2011-02-22 | Koninklijke Philips Electronics N.V. | LED luminaire with optical feedback by image mapping on segmented light sensors |
FI117178B (en) †| 2004-12-23 | 2006-07-14 | Sabik Ab Oy | LED lamp for traffic control |
WO2006099732A1 (en) †| 2005-03-23 | 2006-09-28 | Tir Systems Ltd. | Apparatus and method for collecting and detecting light emitted by a lighting apparatus |
DE102005023295A1 (en) †| 2005-05-12 | 2006-11-16 | Siemens Ag | Circuit for controlling and monitoring a light signal |
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-
2009
- 2009-10-16 IT ITUD2009A000184A patent/IT1396088B1/en active
-
2010
- 2010-10-15 EP EP10798582.2A patent/EP2488401B2/en active Active
- 2010-10-15 WO PCT/IB2010/002625 patent/WO2011045663A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2011045663A1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2016412473B2 (en) * | 2016-06-27 | 2019-10-31 | Siemens Mobility Inc. | Monitoring system, wayside LED signal, and method for monitoring a wayside LED signal |
US11161532B2 (en) * | 2016-06-27 | 2021-11-02 | Siemens Mobility, Inc. | Monitoring system, wayside LED signal, and method for monitoring a wayside LED signal |
EP3480078A1 (en) * | 2017-11-07 | 2019-05-08 | Siemens Schweiz AG | Light signal for displaying signal terms for a traffic route |
Also Published As
Publication number | Publication date |
---|---|
EP2488401B1 (en) | 2013-08-07 |
WO2011045663A1 (en) | 2011-04-21 |
IT1396088B1 (en) | 2012-11-09 |
EP2488401B2 (en) | 2017-07-12 |
ITUD20090184A1 (en) | 2011-04-17 |
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