EP0853302A1 - Appareils de signalisation lumineux à diodes électroluminescentes - Google Patents

Appareils de signalisation lumineux à diodes électroluminescentes Download PDF

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Publication number
EP0853302A1
EP0853302A1 EP97119697A EP97119697A EP0853302A1 EP 0853302 A1 EP0853302 A1 EP 0853302A1 EP 97119697 A EP97119697 A EP 97119697A EP 97119697 A EP97119697 A EP 97119697A EP 0853302 A1 EP0853302 A1 EP 0853302A1
Authority
EP
European Patent Office
Prior art keywords
light
emitting diodes
leds
light emitting
white
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.)
Ceased
Application number
EP97119697A
Other languages
German (de)
English (en)
Inventor
Markus Kästner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Garufo GmbH
Original Assignee
Garufo GmbH
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
Priority claimed from DE29620001U external-priority patent/DE29620001U1/de
Priority claimed from DE29622402U external-priority patent/DE29622402U1/de
Application filed by Garufo GmbH filed Critical Garufo GmbH
Publication of EP0853302A1 publication Critical patent/EP0853302A1/fr
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/095—Traffic lights
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/0418—Constructional details
    • G09F13/0472—Traffic signs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • F21W2111/02—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00 for roads, paths or the like

Definitions

  • the invention relates to a with light emitting diodes equipped light signal device.
  • Devices of this type as for example from the EP 713 999 are known as a display in the rail and Road traffic, in public buildings, in garages, for Elevators, escalators and the like are used.
  • the usage of light emitting diodes as a light source has changed due to their advantages over thermal radiators.
  • the LEDs are not only cheaper, they are are also characterized by the long service life and thereby from that they have little heat.
  • the illuminated symbols with color differences shown i.e. using different LED fields Colors or with light emitting diodes of one color on one Plate of a different color. So far, the basic colors have been used for this used in the visible wavelengths.
  • the invention has for its object a light signal device of the type mentioned at the beginning which the white light or white light areas a largely have constant quality.
  • the combination of teal with yellow orange falls according to the Standard color chart according to DIN 5033, part 3 in the white color range in such a way that a change in the light properties the LEDs due to temperature influence almost has no influence on the resulting light as this moves in the white color range.
  • the solution according to the invention therefore offers a light signal device with approximately constant light quality.
  • the use of only two Emission color groups also facilitate their interpretation, when special white light tuning is required.
  • the hue of the white light can be determined by the number ratio of the two LED groups can be set. This Coordination can also or additionally through current regulation of the two LED groups or of individual LEDs carry out.
  • light emitting diodes are different colors in pairs or groups electrically connected in series, each being the same or a different number of LEDs from the two color groups is interconnected. If one fails LEDs are then depending on the numerical ratio of the color combination the LEDs connected in series with it different color or the same and the other color as well fail, so that the person responsible for the color Numerical ratio received despite failure of a light emitting diode remains.
  • This effect can also be achieved using appropriate control loops can be achieved.
  • regulators and / or power sources that for example, assigned to individual or groups of light-emitting diodes can be the light intensity of each or Groups of light emitting diodes, and thus the color position of the white light of the light signal device, even in the event of failure one or more LEDs can be controlled.
  • This Regulation has the advantage that in the event of a failure of the light emitting diodes not only the color, but also the intensity of white light can be maintained. Furthermore may be a change in hue due to temperature fluctuations be counteracted.
  • Light-emitting diodes that emit white light not only a constant quality of light with one equipped with it Beacon reached, but also the production of exclusively or only in fields emitting white light Illuminated signals or spotlights are simplified.
  • the white light diodes can be used for both foreground and background light signals as well as for signals that only glow in white or for signals shining with different colors be used.
  • the light emitting diodes are preferred bipolar diodes.
  • the configurations according to the invention for achieving white light can be used for both white radiant only Light signal devices, e.g. for reversing lights of vehicles to signal an inserted Reverse gear, as well as part of a multi-colored Signals are used, as is the case with many Road signs are needed.
  • Figure 1a shows a longitudinal section and Figure 1b shows a cross section a spotlight or a light signal device 10 with a housing 11, in the lower part of which the electronics 12 and two groups of light emitting diodes (LED) 13 and 14 included are.
  • the LED field 15 is sealed with the light emitting diodes 13, 14 packed, with LEDs 13 of one group Alternate LEDs 14 of the other group.
  • One group is light-emitting diodes 13, the a blue-green light in the wavelength range between 465 and Emit 498 nm while the second group is LEDs 14 acts, the yellow-orange light in the wavelength range emit between 575 and 600 nm.
  • Color areas namely teal B, white W and yellow orange G drawn with solid lines. With dashed lines Lines are the wavelength ranges still applicable according to the innovation B 'or G' limited.
  • the light intensity of the respective LEDs 13, 14, their number ratio and the wavelengths of the rays determine the hue of white light, i.e. whether the light is blue-white, yellow-white or has an intermediate tint.
  • the color or the operating point K is determined by the numerical ratio of the two LED groups 13,14 determined.
  • FIG. 1 shows an example with a number ratio of 3/1 and Fig.3 one of 1/1, these ratios of course also apply to yellow orange / teal.
  • Fig. 2 shows an example with a number ratio of 3/1 and Fig.3 one of 1/1, these ratios of course also apply to yellow orange / teal.
  • the actual or operating point K i.e. the resulting one Hue more in the left or in the right field W are located. I.e. by temperature change or by failure
  • a light emitting diode will turn the operating point K to the left or to the right, but always move in the white area W. This effect can be seen with conventional white light devices with three color groups but not so easy reach, because there the shift of the operating point in three directions and thus outside the Can reach white area.
  • the light emitting diodes is still a change of the Color position by regulating the current or light intensity of the different LED groups or individual LEDs possible.
  • 2 shows an example in which the LEDs 13 of one group via a controller 20 and that of the others Group via a second controller 21 on not shown, separate power sources are connected so that each LED group 13, 14 can be regulated individually. Also the use of several individual LEDs assigned Power sources and / or regulators are possible.
  • LEDs generally have a long service life. It However, it cannot be prevented that a LED fails. To a color shift due to the failure of Groups can prevent light emitting diodes from a color group of LEDs of different colors in groups Be connected in series so that if one LED fails maintain the numerical ratio of the LEDs that are still lit. remains. An example of this is shown in FIG. At a Numerical ratio of 1/1 are each a blue-green with a yellow-orange LED connected in pairs. At Failure of an LED 13 then becomes related to it LED 14 of the other color also no longer with power provided.
  • a correction of the color tone in case of temperature changes or after failure of LEDs, controllers and / or with, if necessary, adjustable current sources are carried out, the individual or groups of LEDs of the same or mixed Emission colors can be assigned. They are designed that with temperature changes or a failure of LEDs maintain the desired color position remains by the light intensity of the LEDs of one or both Colors or the other LEDs is reset.
  • the light signal devices described have opposite the known three-color devices the advantage that the white light generated is largely independent of temperature is by changing the light quality of the LEDs 13,14 only a shift in the operating point due to temperature fluctuations K takes place within the white field W. This is achieved in particular with LED light, whose wavelength is between 482 and 488 nm or between 587 and 592 nm.
  • the light emitting diodes 13, 14 are preferably two-pole diodes.
  • Light-emitting diodes can also emit light-emitting diodes used to produce white light.
  • An example this is shown in connection with Fig.5, which is an example shows a drive-through prohibition signal 30 that comes from a field 31 with red light-emitting diodes 32 and a central rectangular field 33 with white light emitting diodes 34 exists.
  • Light signals both in accordance with FIGS. 1-3 and in accordance with FIG. 5 can be trained as foreground lighting or for better separation of the color fields in the background version be provided.
  • FIG. 6 shows, for example, the embodiment according to FIG. 5 a background version 30 'shown in partial cross section.
  • the white and red light-emitting diodes 34 and 32 are arranged here in a cylindrical housing 35, in which is a partition wall delimiting the rectangular field 33 located. This allows a clear demarcation of the white Reach the light field.
  • the housing 35 can with if necessary a lens or a clear lens be covered.
  • a background radiator 40 is also shown in FIG. to produce a light with a certain color from a combination of different colors emitting LEDs 34, 41, 42 exist. Even in such cases can use white light emitting diodes 34 a relief for creating the special Represent hue.
  • a diffuser 37 is provided for homogenizing the luminous color. The combination of the different colors broadcast side by side often does not come into play at the edge of the emitter 40. That's why the lens 37 is followed by an aperture 43, in which the area of the opening 44 is smaller than the field area of the LEDs 34, 41, 42. This will be a unified Color of the emitted light reached.
  • FIG. 8 shows a plan view in a and a side view in b a signal transmitter 50, for example for the railway from a base plate 45 with a connected switch housing 46, the base plate 45 arranged in a pattern, Carries white light-emitting diodes 34. At this signal designed as foreground lighting the LEDs in non-adjacent light fields divided up.
  • the base plate has one that stands out from the light Colour. The fields are all white light emitting light-emitting diodes 34 are formed.
  • FIG R A combination of non-adjoining fields of different colors is shown in FIG R "with, for example, green-emitting LEDs 47 and a second pattern 5 "is equipped with white-emitting LEDs 34.
  • the examples described are not based on the respective named LEDs limited. I.e. the examples 1 to 3 can also be emitted with white light Operate diodes while following the examples Figures 5 to 9 with a combination of teal and yellow-orange diodes can be thought of.
EP97119697A 1996-11-18 1997-11-11 Appareils de signalisation lumineux à diodes électroluminescentes Ceased EP0853302A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE29620001U DE29620001U1 (de) 1996-11-18 1996-11-18 Mit Leuchtdioden bestückte Leuchtsignalvorrichtungen
DE29620002U 1996-11-18
DE29620001U 1996-11-18
DE29620002 1996-11-18
DE29622402U 1996-12-24
DE29622402U DE29622402U1 (de) 1996-11-18 1996-12-24 Mit Leuchtdioden bestückte Lichtsignalvorrichtungen

Publications (1)

Publication Number Publication Date
EP0853302A1 true EP0853302A1 (fr) 1998-07-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97119697A Ceased EP0853302A1 (fr) 1996-11-18 1997-11-11 Appareils de signalisation lumineux à diodes électroluminescentes

Country Status (1)

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EP (1) EP0853302A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2356694A (en) * 1999-11-26 2001-05-30 Dorman Traffic Products Ltd Signal apparatus comprising individual light units each capable of emitting more than one colour of light
EP1286321A1 (fr) * 2001-08-20 2003-02-26 Lin; Fong-Jei Feu de circulation avec plusieurs sources d'illumination DEL
DE102004010875B4 (de) * 2003-03-06 2009-09-17 Koito Manufacturing Co., Ltd. Fahrzeugscheinwerfer
DE20321848U1 (de) 2003-11-14 2011-05-19 Signal-Construct, elektrooptische Anzeigen und Systeme GmbH, 75223 LED-Leuchte für Medien mit wellenlängenabhängiger Lichtabsorption und -streuung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875456A (en) * 1972-04-04 1975-04-01 Hitachi Ltd Multi-color semiconductor lamp
US4271408A (en) * 1978-10-17 1981-06-02 Stanley Electric Co., Ltd. Colored-light emitting display
US4945009A (en) * 1987-03-12 1990-07-31 Hitachi, Ltd. Electroluminescence device
US5136483A (en) * 1989-09-08 1992-08-04 Schoeniger Karl Heinz Illuminating device
US5375043A (en) * 1992-07-27 1994-12-20 Inoue Denki Co., Inc. Lighting unit
EP0713999A1 (fr) * 1994-11-24 1996-05-29 Siemens Integra Verkehrstechnik Ag Dispositif de signaux lumineux à diodes électroluminescentes
US5535230A (en) * 1994-04-06 1996-07-09 Shogo Tzuzuki Illuminating light source device using semiconductor laser element

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875456A (en) * 1972-04-04 1975-04-01 Hitachi Ltd Multi-color semiconductor lamp
US4271408A (en) * 1978-10-17 1981-06-02 Stanley Electric Co., Ltd. Colored-light emitting display
US4945009A (en) * 1987-03-12 1990-07-31 Hitachi, Ltd. Electroluminescence device
US5136483A (en) * 1989-09-08 1992-08-04 Schoeniger Karl Heinz Illuminating device
US5375043A (en) * 1992-07-27 1994-12-20 Inoue Denki Co., Inc. Lighting unit
US5535230A (en) * 1994-04-06 1996-07-09 Shogo Tzuzuki Illuminating light source device using semiconductor laser element
EP0713999A1 (fr) * 1994-11-24 1996-05-29 Siemens Integra Verkehrstechnik Ag Dispositif de signaux lumineux à diodes électroluminescentes

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2356694A (en) * 1999-11-26 2001-05-30 Dorman Traffic Products Ltd Signal apparatus comprising individual light units each capable of emitting more than one colour of light
GB2356694B (en) * 1999-11-26 2004-01-21 Dorman Traffic Products Ltd Signal apparatus
EP1286321A1 (fr) * 2001-08-20 2003-02-26 Lin; Fong-Jei Feu de circulation avec plusieurs sources d'illumination DEL
DE102004010875B4 (de) * 2003-03-06 2009-09-17 Koito Manufacturing Co., Ltd. Fahrzeugscheinwerfer
DE20321848U1 (de) 2003-11-14 2011-05-19 Signal-Construct, elektrooptische Anzeigen und Systeme GmbH, 75223 LED-Leuchte für Medien mit wellenlängenabhängiger Lichtabsorption und -streuung

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