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EP2550649B1 - Optical display element and display device - Google Patents

Optical display element and display device Download PDF

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Publication number
EP2550649B1
EP2550649B1 EP11712206.9A EP11712206A EP2550649B1 EP 2550649 B1 EP2550649 B1 EP 2550649B1 EP 11712206 A EP11712206 A EP 11712206A EP 2550649 B1 EP2550649 B1 EP 2550649B1
Authority
EP
European Patent Office
Prior art keywords
receptacle
housing
display element
display
optical
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.)
Not-in-force
Application number
EP11712206.9A
Other languages
German (de)
French (fr)
Other versions
EP2550649A1 (en
Inventor
Axel Beier
Martin Franke
Stefan Nerreter
Volker TÜRCK
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.)
Siemens AG
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to PL11712206T priority Critical patent/PL2550649T3/en
Publication of EP2550649A1 publication Critical patent/EP2550649A1/en
Application granted granted Critical
Publication of EP2550649B1 publication Critical patent/EP2550649B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F21V5/00—Refractors for light sources
    • F21V5/008—Combination of two or more successive refractors along an optical axis
    • 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

Definitions

  • the invention relates to an optical display element, which is particularly suitable for luminous variable message signs or scoreboards.
  • This has a substantially tubular housing whose course is oriented in the installed position at least substantially horizontally.
  • the housing is provided with a receptacle for a light source, in particular, an LED can be installed.
  • a light source in particular, an LED can be installed.
  • the output end there is an exit region for the light emitted by the light source. The exit region thus allows the light hidden by the light source to leave the housing. This can be ensured for example by a housing opening, which is preferably formed by a transparent wall part of the housing.
  • This wall part which can also be formed by a lens, must be transparent to the light emitted by the light source in so far as this is the useful light which is intended to make the optical display element light up.
  • at least one optical element is arranged in the beam path between the receiving and the exit region.
  • optical elements all elements which influence the optical behavior of the display element should be referred to as optical elements.
  • this can be done by lenses or diaphragms, wherein the aperture preferably have a hole to pass the light rays.
  • These optical display elements which can be installed in a display device such as a variable message sign, consist of tubular housings, in which an LED can be clipped as a light source.
  • a converging lens which focuses the light emitted by the LED, with an aperture at the focal point, which can be embodied as an integral part of the housing.
  • a beam-shaping lens At the output end of the housing is a beam-shaping lens.
  • a converging lens with which the emission characteristic of the light emitted by the LED is determined, which thus forms the rays emanating from the display element as it were.
  • the provisions applicable to variable message signs must be taken into account, as prescribed, for example, according to the standard DIN EN 12966-1 with regard to light color, luminance, luminance ratio, emission width and uniformity.
  • diaphragms can be used inside housings of LED display devices. These may be in terms of their aperture be shifted upward so that the optical axis of the housing is not in the center of the aperture. As a result, incident sunlight can be shaded at the lower edge of the screen, so that this can not fall on the LED.
  • the tubular housing are waterproof and are installed in a required for the representation of traffic signs arrangement in the display device.
  • This consists for example of a plate having suitable display openings for the display elements. In this, the display elements are inserted and fixed in a suitable manner.
  • LED's are well known as a light source.
  • SMD LED's that can be mounted, for example on flexible circuit boards.
  • Such LEDs which are already preassembled on a strip of flexible circuit board, offers, for example, the Company LM-Electronic e. K., as can be seen, for example, the data sheet of the product "Power3" in version 10.01.
  • Phantom light comes about when the sunlight falls through the radiating optics of the display element in its interior, especially at low sun and is preferably emitted by reflection at the light source in a sufficient proportion by the beam-shaping lens of the display element again, so that for the viewer falsely the impression arises that the relevant display element is currently lit. This can cause the variable message sign to be misinterpreted or unreadable and must therefore be avoided. Therefore, the formation of the phenomenon of the phantom light must be prevented or at least ensured that the phantom light does not occur above an intensity, which leads to misinterpretation in the viewer of the variable traffic sign.
  • Measures that reduce or suppress the emergence of phantom light for example, an outer shield above the light-emitting optics, a diaphragm in the interior of the housing of the display element and a light-absorbing coating of the housing interior.
  • the object of the invention is to provide an optical display element or a display device for mounting this display element, which can be produced inexpensively and with which the phenomenon of the phantom light can be relatively effectively prevented.
  • the receptacle provided for the light source and the optical element or the optical elements are arranged relative to each other in such a way that in each case there is a height offset between them.
  • the height offset can be determined based on the horizontal orientation of the housing. For example, one may think of a housing center axis, the height offset h being determinable perpendicularly to this horizontal axis, by respectively determining a central point of the optical element, for example the center of gravity, and determining its position with respect to the imaginary housing axis. In the case of centrally symmetrical optical elements, this center of gravity lies on the optical axis of the optical element.
  • the optical axes of the light source to be installed in the receptacle and of the at least one optical element extend horizontally relative to one another.
  • the height offset thus results from the distance of the respective optical axes to each other.
  • a stepped arrangement of the light source to be installed in the receptacle and of the at least one optical element, preferably of the plurality of optical elements, is advantageous.
  • the optical axis of the light source to be incorporated in the receptacle is highest, wherein the optical axis of the optical element following in the beam path of the emitted light is slightly lower and that of the next optical element is slightly lower again, until the light leaves the housing.
  • individual optical elements can also be arranged independently thereof, for example, with their optical axes exactly in the central axis of the housing.
  • the arrangement of the light source to be installed by the Gesstaltung determines the intended for them recording.
  • Suitable receptacles can also be provided for the other optical elements, which allow a reliable fixation in the desired installation position.
  • diaphragms can be formed by integral components of the housing, so that no installation of an additional optical element for the diaphragm is necessary.
  • the respective height offset between adjacent optical elements and / or the light source to be incorporated in the receptacle is 0.5 to 2% of the length of the housing.
  • the length of the housing is to be understood as the length which is to be measured between the light source installed in the receptacle and the last optic located in the beam path of the light source. This length will essentially correspond to the housing length to be measured externally in conventional housing designs. If the housing length and the height offset are set in the manner indicated, this has the advantage that on the one hand the offset is still so small that an undisturbed beam path can be generated from the light source to the last optical element located in the beam path.
  • the offset causes the light source to be sufficiently elevated in relation to the optical axis of the housing so that sunlight incident from above, which could produce phantom light, can not or to a lesser extent hit the LED or light source. This also reflections are avoided, which could lead to the visual impression of a glow of the LED.
  • At least one converging lens in the emission area of the receptacle ie in the area where a light source mounted in the receptacle would illuminate the condenser lens, and an aperture are used as optical elements.
  • the aperture is in the focal point turned away from the recording Conveying lens provided, ie with respect to the mounted light source.
  • the fact that the diaphragm is in the focal point of the converging lens, the opening can be made relatively small, wherein the light emitted from the light source, as far as this is bundled by the converging lens, the aperture can completely pass.
  • a beam-shaping lens is arranged in the exit region. This can also have a height offset to the central axis of the housing or be tilted. However, it is also possible to provide the beam-shaping lens centered in the housing and to align its optical axis exactly horizontally. As a result, a reliable termination of the housing in the exit region by the beam-shaping lens can advantageously be generated.
  • the required radiation characteristic can be influenced by the structure of the beam-shaping lens.
  • the emitted light signal can be adapted in this way to the requirements for the variable message signs.
  • a particular embodiment of the invention is obtained when a fastening device is provided on the housing, which allows installation in only one angular position, measured in a plane to which the housing is perpendicular.
  • This is advantageous so to speak a torsion-proof and position-safe mounting of the display element, for example, in the variable message signs possible. This is necessary because the effect caused by the height offset or the inclined optical axis, only in the correct installation position of the housing comes into effect.
  • a suitable receptacle must be provided in the display panel, which is to form the variable message sign, in which the display element can be used with the fastening device in a defined position.
  • a twist-proof assembly is also advantageous for an astigmatic lens, so that it ensures the desired emission characteristic.
  • a fastening device may be provided for attachment in a defined angular position.
  • the LED which forms the light source, is designed as an SMD and is mounted for contacting on a flexible printed circuit board.
  • the flexible circuit board is designed as a narrow strip on which the LEDs line up.
  • a display device such as a luminous variable message sign or a display panel, in which a plurality of display elements are mounted against rotation, as described in more detail above.
  • the display elements according to the invention can advantageously be put together to form the display device, the requirements For example, the variable traffic signs to be displayed can be taken into account.
  • a display element 11 has a housing 12, which is constructed substantially cylindrical. With an output-side end 13, the housing 12 is inserted into a display device 14 in the form of a display panel. For this purpose, the display device 14 has a suitable opening.
  • the housing 12 is provided with a flange 15, which ensures a defined position of the housing 12 in the axial direction.
  • a rib 16 is mounted, which corresponds to a corresponding, not shown groove in the opening of the display device.
  • FIGS. 3 and 4 Alternative embodiments of elements that ensure a defined angular position of the housing 12 in the display device 14 are shown in FIGS. 3 and 4 shown.
  • the housing has a square cross section, which is beveled at a corner at least at the output end.
  • a corresponding opening for installation is provided in the display device 14, so that only one installation position of the housing 12 is possible.
  • FIG. 4 can be seen, instead of a flattening 17 of the housing according to FIG. 3 or a rib 16 according to FIG. 2 also a wall thickening 18 are used, which leads to a teardrop-shaped outer contour of the housing 12 at least in the region of the output-side end. This also ensures an installation position of the housing with a defined angle.
  • the light source is a LED 19 designed as an SMD.
  • the LED is mounted on a flexible circuit carrier 20 in the form of a long band. Other LEDs are not shown, these are available and with other housings (also not shown) are connected.
  • a receptacle 21 is provided in the housing 12.
  • An unillustrated beam path of the light emitted by the LED 19 passes through a converging lens 22 which focuses this light.
  • the aperture 23 of an aperture 24 through which the light passes is through a beam-shaping lens 25, which forms the exit region 26 for the light, the light is emitted in a suitable angular range.
  • FIG. 1 It can be seen that the optical axes of the LED 19, the converging lens 22, the diaphragm 24 and the beam-shaping lens 25 each extend horizontally. Between these axes, however, in each case a stepwise height offset h is provided, wherein the LED 19 is the highest and the beam-forming lens is the lowest.
  • the height offset h 1 between the LED 19 and the converging lens 22 is 0.23 mm
  • the height offset h 2 between converging lens 22 and aperture 23 is 0.4 mm
  • the height offset h 3 between aperture 24 and beam-forming lens 25 is 0.56 mm.
  • the case length measured from each of the central points of the beam-shaping lens 25 and the LED 19 is 40 mm.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Led Device Packages (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Traffic Control Systems (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Description

Die Erfindung betrifft ein optisches Anzeigeelement, welches insbesondere für leuchtfähige Wechselverkehrszeichen oder Anzeigetafeln geeignet ist. Dieses weist ein im Wesentlichen rohrartiges Gehäuse auf, dessen Verlauf in Einbaulage zumindest im Wesentlichen waagerecht ausgerichtet ist. Als Verlauf des Gehäuses ist die durch die Längsausdehnung des rohrartigen Gehäuses vorgegebene Richtung zu verstehen. An einem eingangsseitigen Ende ist das Gehäuse mit einer Aufnahme für eine Lichtquelle versehen, in die insbesondere eine LED eingebaut werden kann. Am ausgangsseitigen Ende befindet sich ein Austrittsbereich für das von der Lichtquelle ausgesendete Licht. Der Austrittsbereich ermöglicht somit, dass das von der Lichtquelle ausgeblendete Licht das Gehäuse verlassen kann. Dies kann beispielsweise durch eine Gehäuseöffnung sichergestellt werden, die vorzugsweise durch einen transparenten Wandteil des Gehäuses ausgebildet ist. Transparent muss dieser Wandteil, der auch durch eine Linse gebildet sein kann, für das von der Lichtquelle ausgesendete Licht insoweit sein, wie es sich hierbei um das Nutzlicht handelt, welches das optische Anzeigeelement zum leuchten bringen soll. Im Strahlengang zwischen Aufnahme- und Austrittsbereich ist außerdem mindestens ein optisches Element angeordnet. Als optische Elemente sollen im weitesten Sinne alle Elemente bezeichnet werden, die das optische Verhalten des Anzeigeelementes beeinflussen. Insbesondere kann dies durch Linsen oder Blenden erfolgen, wobei die Blenden vorzugsweise ein Loch aufweisen, um die Lichtstrahlen durchzulassen.The invention relates to an optical display element, which is particularly suitable for luminous variable message signs or scoreboards. This has a substantially tubular housing whose course is oriented in the installed position at least substantially horizontally. As the course of the housing is to be understood by the longitudinal extent of the tubular housing predetermined direction. At an input end, the housing is provided with a receptacle for a light source, in particular, an LED can be installed. At the output end, there is an exit region for the light emitted by the light source. The exit region thus allows the light hidden by the light source to leave the housing. This can be ensured for example by a housing opening, which is preferably formed by a transparent wall part of the housing. This wall part, which can also be formed by a lens, must be transparent to the light emitted by the light source in so far as this is the useful light which is intended to make the optical display element light up. In addition, at least one optical element is arranged in the beam path between the receiving and the exit region. In the broadest sense, all elements which influence the optical behavior of the display element should be referred to as optical elements. In particular, this can be done by lenses or diaphragms, wherein the aperture preferably have a hole to pass the light rays.

Ein optisches Anzeigeelement der eingangs angegebenen Art ist beispielsweise aus der EP 1 593 109 B1 und aus der EP 930 600 A1 bekannt. Diese optischen Anzeigeelemente, die in eine Anzeigevorrichtung wie ein Wechselverkehrszeichen eingebaut werden können, bestehen aus rohrförmigen Gehäusen, in die eine LED als Lichtquelle eingeclipst werden kann. Im Strahlengang der LED befindet sich zunächst eine Sammellinse, die das von der LED ausgestrahlte Licht fokussiert, wobei sich im Brennpunkt eine Blende befindet, die als integraler Bestandteil des Gehäuses ausgeführt sein kann. Am ausgangsseitigen Ende des Gehäuses befindet sich eine Strahlformungslinse. Hierunter ist beispielsweise eine Sammellinse zu verstehen, mit der die Abstrahlcharakteristik des von der LED ausgesendeten Lichtes bestimmt wird, die also die vom Anzeigeelement ausgehenden Strahlen sozusagen formt. Hierbei sind die für Wechselverkehrszeichen einschlägigen Bestimmungen zu berücksichtigen, wie sie beispielsweise gemäß der Norm DIN EN 12966-1 hinsichtlich Lichtfarbe, Leuchtdichte, Leuchtdichte-Verhältnis, Abstrahlbreite und Gleichmäßigkeit vorgegeben sind.An optical display element of the type specified, for example, from EP 1 593 109 B1 and from the EP 930 600 A1 known. These optical display elements, which can be installed in a display device such as a variable message sign, consist of tubular housings, in which an LED can be clipped as a light source. In the beam path of the LED, there is first a converging lens, which focuses the light emitted by the LED, with an aperture at the focal point, which can be embodied as an integral part of the housing. At the output end of the housing is a beam-shaping lens. By this is meant, for example, a converging lens with which the emission characteristic of the light emitted by the LED is determined, which thus forms the rays emanating from the display element as it were. In this case, the provisions applicable to variable message signs must be taken into account, as prescribed, for example, according to the standard DIN EN 12966-1 with regard to light color, luminance, luminance ratio, emission width and uniformity.

Gemäß der WO 02/17628 A2 ist es bekannt, dass sogenannte Outdoor-LED-Video-Paneele, die auch als Wechselverkehrskennzeichen verwendet werden können, mit mehreren rohrartigen Gehäusen ausgestattet sein können, welche derart angeordnet werden, dass die Mittelachsen dieser Gehäuse alle nach schräg unten gerichtet sind. Daher kann schräg einfallendes Sonnenlicht schwerer auf die in den Gehäusen befindlichen Leuchtdioden fallen, die vom Rand des Gehäuses abgeschattet werden.According to the WO 02/17628 A2 It is known that so-called outdoor LED video panels, which can also be used as Wechselverkehrskennzeichen can be equipped with a plurality of tubular housings, which are arranged so that the central axes of these housings are all directed obliquely downwards. Therefore, diagonally incident sunlight can be more difficult to fall on the LEDs located in the housings, which are shaded from the edge of the housing.

Gemäß der EP 1 696 171 A1 ist es bekannt, dass im Inneren von Gehäusen von LED-Anzeigevorrichtungen Blenden verwendet werden können. Diese können hinsichtlich ihrer Blendenöffnung nach oben verschoben sein, so dass die optische Achse des Gehäuses nicht im Mittelpunkt der Blendenöffnung liegt. Hierdurch kann einfallendes Sonnenlicht am unteren Blendenrand abgeschattet werden, wodurch dieses nicht auf die Leuchtdiode fallen kann.According to the EP 1 696 171 A1 It is known that diaphragms can be used inside housings of LED display devices. These may be in terms of their aperture be shifted upward so that the optical axis of the housing is not in the center of the aperture. As a result, incident sunlight can be shaded at the lower edge of the screen, so that this can not fall on the LED.

Die rohrförmigen Gehäuse sind wasserdicht ausgeführt und werden in einer für die Darstellung der Verkehrszeichen erforderlichen Anordnung in die Anzeigevorrichtung eingebaut. Diese besteht beispielsweise aus einer Platte, die für die Anzeigeelemente geeignete Aufnahmeöffnungen aufweist. In diese werden die Anzeigeelemente eingeschoben und in geeigneter Weise fixiert.The tubular housing are waterproof and are installed in a required for the representation of traffic signs arrangement in the display device. This consists for example of a plate having suitable display openings for the display elements. In this, the display elements are inserted and fixed in a suitable manner.

LED's sind als Lichtquelle allgemein bekannt. Insbesondere gibt es auch als SMD ausgeführte LED's, die beispielsweise auf flexiblen Schaltungsträgern montiert werden können. Solche LED's, die bereits auf einem Streifen eines flexiblen Schaltungsträgers vormontiert sind, bietet beispielsweise die Firma LM-Electronic e. K. an, wie sich beispielsweise den Datenblatt des Produktes "Power3" in der Version 10.01 entnehmen lässt.LED's are well known as a light source. In particular, there are also designed as SMD LED's that can be mounted, for example on flexible circuit boards. Such LEDs, which are already preassembled on a strip of flexible circuit board, offers, for example, the Company LM-Electronic e. K., as can be seen, for example, the data sheet of the product "Power3" in version 10.01.

Diese Forderungen sind zu erfüllen, damit die Wechselverkehrszeichen zuverlässig abgelesen werden können. Hinzu tritt ein Phänomen, welches als Phantomlicht bezeichnet wird. Phantomlicht kommt zustande, wenn insbesondere bei tief stehender Sonne das Sonnenlicht durch die abstrahlende Optik des Anzeigeelementes in dessen Inneres fällt und durch Reflexion bevorzugt an der Lichtquelle in einem genügenden Anteil durch die Strahlformungslinse des Anzeigeelementes wieder abgestrahlt wird, so dass für den Betrachter fälschlich der Eindruck entsteht, dass das betreffende Anzeigeelement gerade leuchtet. Dies kann dazu führen, dass das Wechselverkehrszeichen falsch interpretiert wird oder nicht mehr ablesbar ist, und muss daher vermieden werden. Daher muss die Ausbildung des Phänomens des Phantomlichts unterbunden werden oder zumindest dafür Sorge getragen werden, dass das Phantomlicht nicht oberhalb einer Intensität auftritt, welche zu Fehlinterpretationen beim Betrachter des Wechselverkehrszeichens führt.These requirements must be fulfilled so that the variable message signs can be read reliably. In addition, there is a phenomenon called phantom light. Phantom light comes about when the sunlight falls through the radiating optics of the display element in its interior, especially at low sun and is preferably emitted by reflection at the light source in a sufficient proportion by the beam-shaping lens of the display element again, so that for the viewer falsely the impression arises that the relevant display element is currently lit. This can cause the variable message sign to be misinterpreted or unreadable and must therefore be avoided. Therefore, the formation of the phenomenon of the phantom light must be prevented or at least ensured that the phantom light does not occur above an intensity, which leads to misinterpretation in the viewer of the variable traffic sign.

Maßnahmen, die die Entstehung von Phantomlicht mindern oder unterdrücken, sind beispielsweise eine äußere Abschirmung oberhalb der lichtabstrahlenden Optik, eine Blende im Inneren des Gehäuses des Anzeigeelementes sowie eine lichtabsorbierende Beschichtung des Gehäuseinneren.Measures that reduce or suppress the emergence of phantom light, for example, an outer shield above the light-emitting optics, a diaphragm in the interior of the housing of the display element and a light-absorbing coating of the housing interior.

Die Aufgabe der Erfindung besteht darin, ein optisches Anzeigeelement bzw. eine Anzeigevorrichtung zur Montage dieses Anzeigeelementes anzugeben, welches sich kostengünstig herstellen lässt und mit dem sich das Phänomen des Phantomlichtes vergleichsweise wirksam unterbinden lässt.The object of the invention is to provide an optical display element or a display device for mounting this display element, which can be produced inexpensively and with which the phenomenon of the phantom light can be relatively effectively prevented.

Diese Aufgabe wird mit dem eingangs genannten Anzeigeelement erfindungsgemäß dadurch gelöst, dass die für die Lichtquelle vorgesehene Aufnahme und das optische Element oder die optischen Elemente (wenn mehrere vorgesehen sind) derart zueinander angeordnet sind, dass sich jeweils ein Höhenversatz zwischen diesen ergibt. Der Höhenversatz ist ermittelbar bezogen auf die waagerechte Ausrichtung des Gehäuses. Man kann sich beispielsweise eine Gehäusemittelachse denken, wobei der Höhenversatz h senkrecht zu dieser waagerechten Achse bestimmbar ist, indem jeweils ein zentraler Punkt des optischen Elementes, beispielsweise der Schwerpunkt, ermittelt wird und dessen Lage in Bezug auf die gedachte Gehäuseachse bestimmt wird. Bei zentralsymmetrischen optischen Elementen liegt dieser Schwerpunkt auf der optischen Achse des optischen Elementes.This object is achieved with the display element mentioned above in accordance with the invention in that the receptacle provided for the light source and the optical element or the optical elements (if several are provided) are arranged relative to each other in such a way that in each case there is a height offset between them. The height offset can be determined based on the horizontal orientation of the housing. For example, one may think of a housing center axis, the height offset h being determinable perpendicularly to this horizontal axis, by respectively determining a central point of the optical element, for example the center of gravity, and determining its position with respect to the imaginary housing axis. In the case of centrally symmetrical optical elements, this center of gravity lies on the optical axis of the optical element.

Gemäß einer vorteilhaften Ausgestaltung der Erfindung verlaufen die optischen Achsen der in die Aufnahme einzubauenden Lichtquelle und des mindestens einen optischen Elementes waagerecht zueinander. Der Höhenversatz ergibt sich damit aus dem Abstand der jeweiligen optischen Achsen zueinander. Dabei ist eine gestufte Anordnung der in die Aufnahme einzubauenden Lichtquelle und des mindestens einen optischen Elementes, bevorzugt der mehreren optischen Elemente, vorteilhaft. Die optische Achse der in die Aufnahme einzubauenden Lichtquelle liegt am höchsten, wobei die optische Achse des im Strahlengang des abgestrahlten Lichtes nachfolgenden optischen Elementes etwas tiefer und die des nächsten optischen Elementes wieder etwas tiefer liegt, bis das Licht das Gehäuse verlässt. Dabei können einzelne optische Elemente jedoch auch unabhängig hiervon beispielsweise mit ihren optischen Achsen genau in der Mittelachse des Gehäuses angeordnet sein. Die Anordnung der einzubauenden Lichtquelle wird durch die Gesstaltung der für sie vorgesehenen Aufnahme bestimmt. Auch für die anderen optischen Elemente können geeignete Aufnahmen vorgesehen werden, die eine zuverlässige Fixierung in der gewünschten Einbaulage ermöglichen. Auch können insbesondere Blenden durch integrale Bestandteile des Gehäuses ausgebildet werden, so dass kein Einbau eines zusätzlichen optischen Elementes für die Blende notwendig ist.According to an advantageous embodiment of the invention, the optical axes of the light source to be installed in the receptacle and of the at least one optical element extend horizontally relative to one another. The height offset thus results from the distance of the respective optical axes to each other. In this case, a stepped arrangement of the light source to be installed in the receptacle and of the at least one optical element, preferably of the plurality of optical elements, is advantageous. The optical axis of the light source to be incorporated in the receptacle is highest, wherein the optical axis of the optical element following in the beam path of the emitted light is slightly lower and that of the next optical element is slightly lower again, until the light leaves the housing. However, individual optical elements can also be arranged independently thereof, for example, with their optical axes exactly in the central axis of the housing. The arrangement of the light source to be installed by the Gesstaltung determines the intended for them recording. Suitable receptacles can also be provided for the other optical elements, which allow a reliable fixation in the desired installation position. In particular, diaphragms can be formed by integral components of the housing, so that no installation of an additional optical element for the diaphragm is necessary.

Vorteilhaft ist es, wenn der jeweilige Höhenversatz zwischen benachbarten optischen Elementen und/oder der in die Aufnahme einzubauenden Lichtquelle (in diesem Falle ist die Lichtquelle und das der Lichtquelle benachbarte optische Element gemeint) 0,5 bis 2 % der Länge des Gehäuses beträgt. Als Länge des Gehäuses ist in diesem Fall diejenige Länge zu verstehen, die zwischen der in die Aufnahme eingebauten Lichtquelle und der im Strahlengang der Lichtquelle befindlichen letzten Optik zu messen ist. Diese Länge wird im Wesentlichen bei üblichen Bauformen des Gehäuses der außen zu messenden Gehäuselänge selbst entsprechen. Werden die Gehäuselänge und der Höhenversatz in der angegebenen Weise ins Verhältnis gesetzt, so hat dies den Vorteil, dass der Versatz einerseits noch so gering ist, dass ein ungestörter Strahlengang von der Lichtquelle zum im Strahlengang befindlichen letzten optischen Element erzeugt werden kann. Auf der anderen Seite führt der Versatz dazu, dass die Lichtquelle im Verhältnis zur optischen Achse des Gehäuses genügend erhöht ist, damit von schräg oben einfallendes Sonnenlicht, welches Phantomlicht erzeugen könnte, nicht oder zu einem geringeren Teil auf die LED oder Lichtquelle treffen kann. Damit werden auch Reflexionen vermieden, die zu dem optischen Eindruck eines Leuchtens der LED führen könnten.It is advantageous if the respective height offset between adjacent optical elements and / or the light source to be incorporated in the receptacle (in this case, the light source and the light source adjacent optical element is meant) is 0.5 to 2% of the length of the housing. In this case, the length of the housing is to be understood as the length which is to be measured between the light source installed in the receptacle and the last optic located in the beam path of the light source. This length will essentially correspond to the housing length to be measured externally in conventional housing designs. If the housing length and the height offset are set in the manner indicated, this has the advantage that on the one hand the offset is still so small that an undisturbed beam path can be generated from the light source to the last optical element located in the beam path. On the other hand, the offset causes the light source to be sufficiently elevated in relation to the optical axis of the housing so that sunlight incident from above, which could produce phantom light, can not or to a lesser extent hit the LED or light source. This also reflections are avoided, which could lead to the visual impression of a glow of the LED.

Als optische Elemente kommen vorteilhaft zumindest eine Sammellinse im Abstrahlbereich der Aufnahme, d. h. in dem Bereich, wo eine in der Aufnahme montierte Lichtquelle die Sammellinse beleuchten würde, und eine Blende zum Einsatz. Die Blende ist in dem der Aufnahme abgekehrten Brennpunkt der Sammellinse vorgesehen, d. h. gegenüber der montierten Lichtquelle. Dadurch, dass die Blende im Brennpunkt der Sammellinse liegt, kann die Öffnung vergleichsweise klein ausgeführt sein, wobei das von der Lichtquelle abgestrahlte Licht, soweit dies von der Sammellinse gebündelt wird, die Blende vollständig passieren kann. Allerdings kann von außen eintretendes Licht, insbesondere das Sonnenlicht der tief stehenden Sonne, die Blende nur im Bereich der Blendenöffnung durchtreten und daher nur ein kleiner Teil dieses Lichtes bis zur Lichtquelle vordringen. Die Ausbildung von Phantomlicht wird auf diese Weise vorteilhaft minimiert.Advantageously, at least one converging lens in the emission area of the receptacle, ie in the area where a light source mounted in the receptacle would illuminate the condenser lens, and an aperture are used as optical elements. The aperture is in the focal point turned away from the recording Conveying lens provided, ie with respect to the mounted light source. The fact that the diaphragm is in the focal point of the converging lens, the opening can be made relatively small, wherein the light emitted from the light source, as far as this is bundled by the converging lens, the aperture can completely pass. However, light entering from the outside, in particular the sunlight of the low sun, can only pass through the diaphragm in the region of the diaphragm aperture and therefore only a small part of this light can penetrate to the light source. The formation of phantom light is advantageously minimized in this way.

Weiterhin ist es vorteilhaft, wenn im Austrittsbereich eine Strahlformungslinse angeordnet ist. Diese kann ebenfalls einen Höhenversatz zur Mittelachse des Gehäuses aufweisen oder gekippt sein. Allerdings ist es auch möglich, die Strahlformungslinse zentriert im Gehäuse vorzusehen und ihre optische Achse genau waagerecht auszurichten. Hierdurch lässt sich vorteilhaft ein zuverlässiger Abschluss des Gehäuses im Austrittsbereich durch die Strahlformungslinse erzeugen. Die geforderte Abstrahlcharakteristik lässt sich durch den Aufbau der Strahlformungslinse beeinflussen. Insbesondere ist es vorteilhaft, die Strahlformungslinse astigmatisch auszuführen, so dass diese nicht rotationssymmetrisch aufgebaut ist. Hierdurch können beispielsweise verschiedene Öffnungswinkel in horizontaler und vertikaler Richtung erzeugt werden. Das auszusendende Lichtsignal kann auf diese Weise an die Anforderungen für das Wechselverkehrszeichen angepasst werden.Furthermore, it is advantageous if a beam-shaping lens is arranged in the exit region. This can also have a height offset to the central axis of the housing or be tilted. However, it is also possible to provide the beam-shaping lens centered in the housing and to align its optical axis exactly horizontally. As a result, a reliable termination of the housing in the exit region by the beam-shaping lens can advantageously be generated. The required radiation characteristic can be influenced by the structure of the beam-shaping lens. In particular, it is advantageous to perform the beam-shaping lens astigmatically, so that it is not rotationally symmetrical. As a result, for example, different opening angles can be generated in the horizontal and vertical directions. The emitted light signal can be adapted in this way to the requirements for the variable message signs.

Eine besondere Ausführungsform der Erfindung wird erhalten, wenn an dem Gehäuse eine Befestigungsvorrichtung vorgesehen ist, die einen Einbau in nur einer Winkellage, gemessen in einer Ebene, zu der das Gehäuse senkrecht verläuft, ermöglicht. Hiermit ist vorteilhaft sozusagen eine verdrehsichere und lagesichere Montage des Anzeigeelementes beispielsweise in dem Wechselverkehrszeichen möglich. Dies wird erforderlich, da der Effekt, der durch den Höhenversatz bzw. die geneigte optische Achse entsteht, nur bei der richtigen Einbaulage des Gehäuses zur Wirkung kommt. Hierzu muss beispielsweise in der Anzeigetafel, die das Wechselverkehrszeichen bilden soll, eine geeignete Aufnahme vorgesehen werden, in die das Anzeigeelement mit der Befestigungsvorrichtung in definierter Position eingesetzt werden kann. Auch für eine astigmatische Linse ist eine verdrehsichere Montage von Vorteil, damit diese die gewünschte Abstrahlcharakteristik sicherstellt. Auch für die Montage der astikmatischen Linse kann eine Befestigungsvorrichtung für eine Befestigung in einer definierten Winkellage vorgesehen sein.A particular embodiment of the invention is obtained when a fastening device is provided on the housing, which allows installation in only one angular position, measured in a plane to which the housing is perpendicular. This is advantageous so to speak a torsion-proof and position-safe mounting of the display element, for example, in the variable message signs possible. This is necessary because the effect caused by the height offset or the inclined optical axis, only in the correct installation position of the housing comes into effect. For this purpose, for example, a suitable receptacle must be provided in the display panel, which is to form the variable message sign, in which the display element can be used with the fastening device in a defined position. A twist-proof assembly is also advantageous for an astigmatic lens, so that it ensures the desired emission characteristic. Also, for mounting the astikmatischen lens, a fastening device may be provided for attachment in a defined angular position.

Vorteilhaft ist es weiter, wenn die LED, die die Lichtquelle bildet, als SMD ausgeführt ist und zur Kontaktierung auf einer flexiblen Leiterplatte montiert ist. Auf diese Weise lässt sich eine Montage auch einer Vielzahl von LED's leicht bewerkstelligen, da diese bereits auf der flexiblen Leiterplatte montiert sind und durch die mögliche Verformung der Leiterplatte mit geringem Montageaufwand in die einzelnen Aufnahmen in den Gehäusen eingesetzt werden können. Insbesondere ist die flexible Leiterplatte als schmaler Streifen ausgeführt, auf dem sich die LED's aneinanderreihen.It is also advantageous if the LED, which forms the light source, is designed as an SMD and is mounted for contacting on a flexible printed circuit board. In this way, an assembly of a variety of LED's can easily accomplish, since they are already mounted on the flexible circuit board and can be used by the possible deformation of the circuit board with low installation costs in the individual recordings in the cases. In particular, the flexible circuit board is designed as a narrow strip on which the LEDs line up.

Die eingangs angegebene Aufgabe wird außerdem durch eine Anzeigevorrichtung, wie beispielsweise ein leuchtfähiges Wechselverkehrszeichen oder eine Anzeigetafel, gelöst, in dem mehrere Anzeigeelemente verdrehsicher montiert sind, wie sie vorstehend näher beschrieben wurden. Auf diese Weise lassen sich die erfindungsgemäßen Anzeigeelemente vorteilhaft zu der Anzeigevorrichtung zusammenstellen, wobei die Anforderungen beispielsweise an das anzuzeigende Wechselverkehrszeichen berücksichtigt werden können.The object mentioned above is also achieved by a display device, such as a luminous variable message sign or a display panel, in which a plurality of display elements are mounted against rotation, as described in more detail above. In this way, the display elements according to the invention can advantageously be put together to form the display device, the requirements For example, the variable traffic signs to be displayed can be taken into account.

Weitere Einzelheiten der Erfindung werden nachfolgend anhand der Zeichnung beschrieben. Gleiche oder sich entsprechende Zeichnungselemente sind jeweils mit den gleichen Bezugszeichen versehen und werden nur insoweit mehrfach erläutert, wie sich Unterschiede zwischen den einzelnen Figuren ergeben. Es zeigen

Figur 1
ein Ausführungsbeispiel des erfindungsgemäßen Anzeigeelementes mit gestufter optischer Achse, eingebaut in ein Ausführungsbeispiel einer erfindungsgemäßen Anzeigevorrichtung, im schematischen Schnitt,
Figur 2
den Schnitt II-II gemäß Figur 1, wobei eine Einrichtung für eine lagerichtige Montage des Anzeigeelementes zu erkennen ist,
Figur 3 und 4
alternative Elemente, die eine lagerichtige Montage sicherstellen als Aufsicht.
Further details of the invention are described below with reference to the drawing. Identical or corresponding drawing elements are each provided with the same reference numerals and will only be explained several times as far as there are differences between the individual figures. Show it
FIG. 1
An embodiment of the display element according to the invention with a stepped optical axis, installed in an embodiment of a display device according to the invention, in a schematic section,
FIG. 2
Section II-II according to FIG. 1 , wherein a device for a correct position mounting of the display element can be seen,
FIGS. 3 and 4
alternative elements that ensure a correct position mounting as a supervision.

Ein Anzeigeelement 11 weist ein Gehäuse 12 auf, welches im Wesentlichen zylindrisch aufgebaut ist. Mit einem ausgangsseitigen Ende 13 ist das Gehäuse 12 in eine Anzeigevorrichtung 14 in Form einer Anzeigetafel eingesteckt. Hierzu weist die Anzeigevorrichtung 14 eine geeignete Öffnung auf. Das Gehäuse 12 ist mit einem Flansch 15 versehen, welcher eine definierte Position des Gehäuses 12 in axialer Richtung gewährleistet. Außerdem ist außen am Gehäuse eine Rippe 16 angebracht, die mit einer entsprechenden, nicht näher dargestellten Nut in der Öffnung der Anzeigevorrichtung korrespondiert. Hierdurch wird auch die Winkellage des Gehäuses 12 in der Anzeigevorrichtung 14 genau definiert, wie Figur 2 zu entnehmen ist.A display element 11 has a housing 12, which is constructed substantially cylindrical. With an output-side end 13, the housing 12 is inserted into a display device 14 in the form of a display panel. For this purpose, the display device 14 has a suitable opening. The housing 12 is provided with a flange 15, which ensures a defined position of the housing 12 in the axial direction. In addition, on the outside of the housing, a rib 16 is mounted, which corresponds to a corresponding, not shown groove in the opening of the display device. As a result, the angular position of the housing 12 in the display device 14 is defined exactly how FIG. 2 can be seen.

Alternative Ausgestaltungen für Elemente, die eine definierte Winkellage des Gehäuses 12 in der Anzeigevorrichtung 14 gewährleisten, sind in Figur 3 und 4 dargestellt. In Figur 3 hat das Gehäuse beispielsweise einen quadratischen Querschnitt, wobei dieses zumindest am ausgangsseitigen Ende an einer Ecke abgeschrägt ist. Eine entsprechende Öffnung zum Einbau wird in der Anzeigevorrichtung 14 vorgesehen, so dass nur eine Einbaulage des Gehäuses 12 möglich ist. Wie Figur 4 zu entnehmen ist, kann statt einer Abflachung 17 des Gehäuses gemäß Figur 3 oder einer Rippe 16 gemäß Figur 2 auch eine Wandverdickung 18 zum Einsatz kommen, die zu einer tropfenförmigen Außenkontur des Gehäuses 12 zumindest im Bereich des ausgangsseitigen Endes führt. Auch hierdurch ist eine Einbaulage des Gehäuses mit definiertem Winkel gewährleistet.Alternative embodiments of elements that ensure a defined angular position of the housing 12 in the display device 14 are shown in FIG FIGS. 3 and 4 shown. In FIG. 3 For example, the housing has a square cross section, which is beveled at a corner at least at the output end. A corresponding opening for installation is provided in the display device 14, so that only one installation position of the housing 12 is possible. As FIG. 4 can be seen, instead of a flattening 17 of the housing according to FIG. 3 or a rib 16 according to FIG. 2 also a wall thickening 18 are used, which leads to a teardrop-shaped outer contour of the housing 12 at least in the region of the output-side end. This also ensures an installation position of the housing with a defined angle.

Der Figur 1 lässt sich weiter entnehmen, dass als Lichtquelle eine als SMD ausgeführte LED 19 zum Einsatz kommt. Die LED ist auf einem flexiblen Schaltungsträger 20 in Form eines langen Bandes montiert. Weitere LED's sind nicht dargestellt, wobei diese vorhanden sind und mit weiteren Gehäusen (ebenfalls nicht dargestellt) verbunden sind. Für die LED 19 ist im Gehäuse 12 eine Aufnahme 21 vorgesehen. Ein nicht näher dargestellter Strahlengang des von der LED 19 ausgestrahlten Lichtes verläuft durch eine Sammellinse 22, die dieses Licht bündelt. Im Brennpunkt der Sammellinse 22, welcher der LED 19 abgekehrt ist, befindet sich die Öffnung 23 einer Blende 24, durch die das Licht hindurchtritt, durch eine Strahlformungslinse 25, die den Austrittsbereich 26 für das Licht bildet, wird das Licht in einem geeigneten Winkelbereich abgestrahlt.Of the FIG. 1 It can also be seen that the light source is a LED 19 designed as an SMD. The LED is mounted on a flexible circuit carrier 20 in the form of a long band. Other LEDs are not shown, these are available and with other housings (also not shown) are connected. For the LED 19, a receptacle 21 is provided in the housing 12. An unillustrated beam path of the light emitted by the LED 19 passes through a converging lens 22 which focuses this light. At the focal point of the condenser lens 22 which faces away from the LED 19, the aperture 23 of an aperture 24 through which the light passes is through a beam-shaping lens 25, which forms the exit region 26 for the light, the light is emitted in a suitable angular range.

Weiterhin ist Figur 1 zu entnehmen, dass die optischen Achsen der LED 19, der Sammellinse 22, der Blende 24 und der Strahlformungslinse 25 jeweils horizontal verlaufen. Zwischen diesen Achsen ist aber jeweils ein stufenweiser Höhenversatz h vorgesehen, wobei die LED 19 am höchsten und die Strahlformungslinse am tiefsten liegt. Der Höhenversatz h1 zwischen der LED 19 und der Sammellinse 22 beträgt 0,23 mm, der Höhenversatz h2 zwischen Sammellinse 22 und Blende 23 beträgt 0,4 mm und der Höhenversatz h3 zwischen Blende 24 und Strahlformungslinse 25 beträgt 0,56 mm. Die Gehäuselänge, die gemessen wird ausgehend jeweils von den zentralen Punkten der Strahlformungslinse 25 und der LED 19, beträgt 40 mm. Bei dieser Anordnung bewirkt der jeweilige Höhenversatz h zwischen den einzelnen optischen Elementen, dass der Strahlengang durch die optischen Elemente leicht nach unten geneigt ist. Dies entspricht der gewünschten Abstrahlcharakteristik im Austrittsbereich 26 des Gehäuses.Furthermore is FIG. 1 It can be seen that the optical axes of the LED 19, the converging lens 22, the diaphragm 24 and the beam-shaping lens 25 each extend horizontally. Between these axes, however, in each case a stepwise height offset h is provided, wherein the LED 19 is the highest and the beam-forming lens is the lowest. The height offset h 1 between the LED 19 and the converging lens 22 is 0.23 mm, the height offset h 2 between converging lens 22 and aperture 23 is 0.4 mm and the height offset h 3 between aperture 24 and beam-forming lens 25 is 0.56 mm. The case length measured from each of the central points of the beam-shaping lens 25 and the LED 19 is 40 mm. With this arrangement, the respective height offset h between the individual optical elements causes the beam path to be inclined slightly downwards through the optical elements. This corresponds to the desired radiation characteristic in the outlet region 26 of the housing.

Claims (9)

  1. Optical display element, suitable for luminous variable message signs or display boards, having a substantially tubular housing (12), whose profile is aligned at least substantially horizontally and which
    • is equipped at one input-side end with a receptacle (21) for a light source, in particular an LED (19),
    • is equipped at an output-side end with an exit region (26) for the light emitted by the light source, and
    • is equipped, in the beam path between the receptacle (21) and the exit region (26), with a plurality of optical elements (22, 24, 25), including a lens (22, 25) or a cover (24),
    characterized
    in that the receptacle (21) and the optical elements (22, 24, 25) are arranged with respect to one another in such a way that, from the receptacle to the exit region, a stepped height offset h with respect to the housing mid-axis results between each of said elements and receptacle.
  2. Display element according to Claim 1,
    characterized
    in that the optical axes of the light source to be installed in the receptacle (21) and of the at least one optical element (22, 24, 25) run horizontally.
  3. Display element according to Claim 2,
    characterized
    in that the respective height offset h between adjacent optical elements (22, 24, 25) and/or the light source to be installed in the receptacle is from 0.5 to 2% of the length of the housing.
  4. Display element according to one of the preceding claims, characterized
    in that the optical elements comprise
    • a converging lens (22) in the emission region of the receptacle (21), and
    • a cover (24), which lies at the focal point of the converging lens (22), which focal point is turned away from the receptacle (21).
  5. Display element according to one of the preceding claims,
    characterized in that a beam-shaping lens (25) is arranged in the exit region (26).
  6. Display element according to Claim 5,
    characterized
    in that the beam-shaping lens (25) has an astigmatic configuration.
  7. Display element according to one of the preceding claims,
    characterized
    in that a fastening apparatus (15, 16) is provided on the housing (12) and enables installation in only one angular position, measured in a plane to which the housing runs perpendicular.
  8. Display element according to one of the preceding claims,
    characterized
    in that the LED (19) is in the form of an SMD and is fitted for contact-making purposes on a flexible circuit carrier (20).
  9. Display device, in particular a luminous variable message sign or display board,
    characterized
    in that a plurality of display elements according to one of the preceding claims are fitted in rotationally secure fashion in said display device.
EP11712206.9A 2010-03-24 2011-03-22 Optical display element and display device Not-in-force EP2550649B1 (en)

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DE102010012971 2010-03-24
PCT/EP2011/054293 WO2011117217A1 (en) 2010-03-24 2011-03-22 Optical display element and display device

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WO2011117217A1 (en) 2011-09-29
US9171488B2 (en) 2015-10-27
BR112012024196A2 (en) 2016-07-05
ES2464141T3 (en) 2014-05-30
CA2794034A1 (en) 2011-09-29
CN102812507A (en) 2012-12-05
RU2012145125A (en) 2014-04-27
DK2550649T3 (en) 2014-06-30
PL2550649T3 (en) 2014-09-30
RU2546486C2 (en) 2015-04-10
US20130063951A1 (en) 2013-03-14
CN102812507B (en) 2016-04-13
EP2550649A1 (en) 2013-01-30

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