EP2850362B1 - Indicator lamp - Google Patents

Indicator lamp Download PDF

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Publication number
EP2850362B1
EP2850362B1 EP12809627.8A EP12809627A EP2850362B1 EP 2850362 B1 EP2850362 B1 EP 2850362B1 EP 12809627 A EP12809627 A EP 12809627A EP 2850362 B1 EP2850362 B1 EP 2850362B1
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EP
European Patent Office
Prior art keywords
light
lens
lens unit
light source
indicator lamp
Prior art date
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EP12809627.8A
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German (de)
French (fr)
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EP2850362A1 (en
Inventor
Jindrich HALAMA
Jiri VARAK
Vit Ledl
Radek Melich
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Siemens AG
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Siemens AG
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Publication of EP2850362A1 publication Critical patent/EP2850362A1/en
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    • 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
    • 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
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/023—Light-emitting indicators
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/036—Light emitting elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/054—Optical elements
    • H01H2219/06—Reflector
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/054—Optical elements
    • H01H2219/066—Lens

Definitions

  • the invention relates to a control lamp, which is in particular part of an electromechanical command device.
  • Indicator lights are used to visually signal a condition of a device in which the warning lights are installed.
  • the beacons For operator-easily detectable signaling, the beacons must provide uniform and bright illumination from the front to a defined viewing angle, e.g. 60 ° with respect to a longitudinal axis of the indicator.
  • Indicator lights are for this purpose e.g. realized with a diffuser, with which over the (entire) surface of the indicator light a uniform illumination can be achieved.
  • a diffuser disposed between a light source and a transparent, frequently colored cover usually entails a loss of brightness.
  • the absence of the diffuser provides for a higher brightness, but brings a non-uniform illumination of the cover with it.
  • the control lamp comprises a housing and a light source arranged in the housing, which emits light when energized. Furthermore, a lens arrangement with a first lens unit is provided, which is arranged in the direction of propagation of the light emitted by the light source and arranged such that light rays emitted by the light source exit substantially parallel from a side facing away from the light source side of the first lens unit.
  • the side facing away from the light source side of the first lens unit is an exit surface of the first lens unit. In essence, this exit surface extends perpendicular to a longitudinal axis of the indicator light.
  • the exit surface of the first lens unit may have a continuous or a non-continuous profile in cross section. In particular, the exit surface can consist of a multiplicity of non-continuous partial surfaces.
  • the lens arrangement comprises a second lens, which is arranged on the side facing away from the light source side of the first lens unit and arranged such that a part of the emerging from the first lens unit light beams are directed with respect to the parallel propagation direction to a transparent side surface of the housing.
  • the proposed warning light not only allows a uniform brightness over the viewing area with high luminosity, but also a lighting on their side surfaces, so that the visibility of the illumination of the indicator light is given even from a large viewing angle. If the indicator light is used especially in safety-relevant systems, this contributes to a higher level of safety. In addition, the visibility of the illuminated indicator light by a user is perceived as better.
  • the advantages described can be achieved using a conventional light bulb or a light emitting diode (LED).
  • the transparent side surface of the housing through which a part of the light rays is directed, may be formed by a cup-shaped, for example colored, cap.
  • the deflected by the second lens light rays pass through the side walls of the cap.
  • the undeflected light rays pass through the bottom or lid of the cap.
  • the bottom or lid forms a viewing surface of the indicator light, which, as usual, lies substantially in a plane perpendicular to the longitudinal direction of propagation of the light rays.
  • the first lens unit comprises at least one, in particular aspherical, Fresnel lens.
  • a Fresnel lens as a first lens unit allows space-saving manner that light rays emitted by the light source substantially parallel out of the side facing away from the light source side of the Fresnel lens exit. In particular, this makes it possible to arrange the light source at a short distance from the first lens unit.
  • the first lens unit may also be formed by a conventional lens with a convex surface on the side facing away from the light source side. The aspherical shape can reduce the aberrations caused by spherical lenses.
  • the second lens is a prismatic ring whose entrance surface overlaps at least partially with the exit surface of the light beams of the first lens unit.
  • An overlap of the entry surface of the prismatic ring with the exit surface of the first lens unit may be expedient for mechanical reasons. If as many rays of light emerging from the exit surface of the first lens unit are to be deflected to the side by the prismatic ring, then the entrance surface may also completely overlap with the exit surface of the first lens unit.
  • the second lens completely reflects and deflects the light beams entering it.
  • the second lens need not be designed to reflect the light beams entering it.
  • the prismatic ring has the shape of a triangle, in particular an equilateral triangle, so that the light rays entering the entrance surface of the prismatic ring are reflected approximately at a right angle.
  • the entrance surface of the second lens and the exit surface of the first lens unit are parallel to each other.
  • the entrance surface of the second lens and the exit surface of the first lens unit may adjoin one another. This ensures that the deflection of the light rays entering the prismatic ring takes place in the desired manner.
  • a further embodiment of the proposed indicator light provides that an exit surface of the second lens is arranged parallel to a transparent surface portion of a transparent cap and in particular to this borders.
  • the cap can be colored.
  • the purpose of the cap is to provide mechanical protection of the lens assembly. If the cap is colored, a certain signal effect can be caused by the choice of color. As already explained above, the cap can have a cup-shaped shape. At this time, the light beams deflected by the second lens pass through the side walls while the undeflected light beams pass through the bottom.
  • the housing between the light source and the first lens unit comprises a light reflecting body, which reflects light emitted by the light source and / or reflected by the first lens unit.
  • the light reflecting body allows a more uniform and uniform illumination of the warning light when a viewer looks at the warning light at an angle with respect to the longitudinal axis of the warning light.
  • the light reflection body is formed from a light and diffusive material. It is particularly preferred if the light reflection body is formed from a white material.
  • the light reflecting body may consist of a colored plastic. Due to the light color and the resulting reflection properties of the light reflection body assumes the function of a "secondary" light source with respect to an oblique viewing angle.
  • the light reflection body extends from the light source to the first lens unit in a cone shape.
  • the invention further provides an electromechanical control device comprising a pushbutton or switch with a control lamp of the type described above.
  • an electromechanical command device makes it possible to actively give a switching command by actuating it.
  • the command device can be used to switch a machine on or off or to activate or deactivate a specific function.
  • the structure of an electromechanical control device can be realized in many different ways and is of minor importance to the present invention.
  • An exemplary structure of a command device for example, the above-mentioned document US 4,758,701 be removed.
  • Fig. 1 shows a cross-sectional view of a control lamp 100 according to the invention.
  • the indicator 100 includes a cylindrical housing 1, in which a light source 2 is arranged.
  • the light source 2 may be, for example, a light bulb or a light emitting diode.
  • a longitudinal axis of the cylindrical housing 1 is identified by the reference numeral 3.
  • the light source 2 lies on the longitudinal axis 3. Light emitted by the light source 2 extends in a direction of an essentially longitudinal propagation in the direction of an outer end 4 of the housing 1.
  • a lens assembly 5 is mounted at the outer end 4 of the housing 1.
  • a cap 13 is arranged on the side facing away from the light source 2 side of the lens assembly 5.
  • the cap 13 has a pot-shaped shape and surrounds the lens assembly 5.
  • the cap 13 is with its lateral flanks or its side surface 12 with the outer end 4 of the housing 1, optionally releasably latched.
  • About the locking the lens assembly 5 may be fixed in the indicator 100.
  • the cap 13 is made of a transparent and optionally colored material.
  • the lens assembly 5 comprises a first lens unit 6 and a second lens 7.
  • the lens unit 6 may be formed by a single lens or a plurality of lenses.
  • An entrance surface of the light beams of the lens unit 6 is designated by the reference numeral 8.
  • the light beams exit via a light exit surface 9 on the side of the lens unit 6 facing away from the light source 2.
  • the lens unit 6 is such that light beams emitted by the light source 2 exit the exit surface 9 substantially parallel. This is done a projection of the point of light emanating from the light source 2 light rays into the infinite.
  • the light beams 18 emitted from the point light source extend in the direction of the lens unit 6 and enter the lens unit 6 through the entrance surface 8.
  • the light beams 18 are deflected at the entrance surface (ie, a first optical surface).
  • a further deflection of the light beams 18 takes place after passing through the interior of the lens 6 at a light exit surface 9 (second optical surface).
  • the shape of the lens unit 6 (which may be a single lens or a plurality of lenses) deflects the light rays 18 into the infinite in the desired manner. This means that the light rays 18 emerging from the light exit surface 9 extend approximately parallel. This results in a plane perpendicular to the longitudinal axis 3, a uniform illumination.
  • the lens unit 6 is formed by a single Fresnel lens.
  • the use of a Fresnel lens makes it possible in particular to make the distance between the light source 2 and the lens unit 6 very small.
  • Another advantage of the Fresnel lens is that in contrast to the in Fig. 3 illustrated lens unit 6 is very flat, which can be 100 compact control lights realized.
  • a Fresnel lens is preferably used as the lens unit 6.
  • the uniform illumination is supported by a arranged between the light source 2 and the lens unit 6 light reflection body 15, which has the shape of a cone in cross section. How out Fig. 1 it can be seen, the cone widens from the light source 2 to the lens unit 6.
  • the light reflection body 15 reflects light emitted by the light source 2 and / or reflected by the lens unit 6.
  • the light reflecting body 15 is made of a light and diffusive material. Particularly good reflection properties arise when the light reflection body is white.
  • the light reflecting body 15 is made of a white plastic.
  • the light reflection body 15 represents, in particular from oblique viewing angles, a "secondary" light source.
  • an oblique viewing angle is understood as a viewing of the indicator light 100, which takes place from outside the longitudinal axis 3. It has been found that the uniform illumination effect of the viewing surface 14 is maintained up to a viewing angle 17 of 60 ° with respect to the longitudinal axis 3 or a parallel thereto.
  • the light reflecting body 15 could also be formed parabolic-shaped. For manufacturing reasons, however, the shape of a cone is to be preferred.
  • the second lens 7 of the lens arrangement 5 part of the light beams emerging from the first lens unit 6 can be directed with respect to the longitudinal propagation direction, ie the longitudinal axis, to the transparent side surface 12 of the cover cap 13.
  • the second lens 7 is formed as a prismatic ring, while entrance surface 10 at least partially overlaps with the exit surface 9 of the light beams of the lens unit 6.
  • Fig. 1 shown.
  • the prismatic ring is partially on an end face of the outer edge 4 of the housing 1.
  • the prismatic ring 7 could also be arranged on the lens unit 6 such that the entrance surface 10 of the lens 7 completely overlaps with the exit surface 9 of the lens unit 6.
  • the prismatic ring 7 in cross-section on the shape of an approximately isosceles triangle.
  • the lens 7 completely reflects the light beams entering it and deflects them in the direction of the side surfaces 12 of the cap 13.
  • a light emission in the region of the viewing surface 14 is prevented in the region of the prismatic lens 7. This results in a dark ring, which enhances the perception of the side emerging from the cap 13 light.
  • the illumination of the control lamp 100 can be perceived not only from the direction of the longitudinal axis and within the above-described viewing angle, but also from a complete lateral view of the indicator lamp 100.
  • Fig. 2 shows in an enlarged view the lighting concept of the indicator 100 in the region of the cap 13.
  • results in the area of the viewing surface 14 is a clearly demarcated, circular illuminated area.
  • the transition from an illuminated area 19 of the viewing area 14 to an unilluminated area, which is perceivable as a dark ring 16, is identified by the reference numeral 20.
  • the dark ring 16, the circular illuminated viewing area 14, is caused by the presence of the prismatic lens 7.
  • the flanks or side surfaces 12 of the cap 13 are in contrast illuminated again due to the presence of the prismatic ring 7. This is indicated by the reference numeral 19.
  • Fig. 3 In addition, the already mentioned viewing angle 17 with respect to a parallel 3 'to the longitudinal axis 3 is shown. If the parallel 3 'passes through the boundary 20, the viewing angle 17 marks the transition between the illuminated area 19 and the non-illuminated area 16 to the outside.

Description

Die Erfindung betrifft eine Kontrollleuchte, die insbesondere Bestandteil eines elektromechanischen Befehlsgeräts ist. Kontrollleuchten dienen der optischen Signalisierung eines Zustands eines Geräts, in das die Kontrollleuchten eingebaut sind. Für eine durch einen Bediener einfach erfassbare Signalisierung müssen die Kontrollleuchten eine gleichförmige und helle Beleuchtung von vorne bis zu einem definierten Betrachtungswinkel, z.B. 60° bezüglich einer Längsachse der Kontrollleuchte, aufweisen.The invention relates to a control lamp, which is in particular part of an electromechanical command device. Indicator lights are used to visually signal a condition of a device in which the warning lights are installed. For operator-easily detectable signaling, the beacons must provide uniform and bright illumination from the front to a defined viewing angle, e.g. 60 ° with respect to a longitudinal axis of the indicator.

Kontrollleuchten werden hierzu z.B. mit einem Diffuser realisiert, mit denen über die (gesamte) Oberfläche der Kontrollleuchte eine gleichförmige Beleuchtung erzielbar ist. Allerdings bringt das Vorsehen eines Diffusors, der zwischen einer Lichtquelle und einer transparenten, häufig eingefärbten Abdeckung angeordnet ist, in der Regel einen Helligkeitsverlust mit sich. Der Verzicht auf den Diffusor sorgt zwar für eine höhere Helligkeit, bringt aber eine ungleichförmige Ausleuchtung der Abdeckung mit sich.Indicator lights are for this purpose e.g. realized with a diffuser, with which over the (entire) surface of the indicator light a uniform illumination can be achieved. However, the provision of a diffuser disposed between a light source and a transparent, frequently colored cover usually entails a loss of brightness. The absence of the diffuser provides for a higher brightness, but brings a non-uniform illumination of the cover with it.

Um eine gleichförmige Helligkeit über die Betrachtungsfläche bei gleichzeitig hoher Leuchtkraft zu ermöglichen, schlägt die US 4,758,701 die Verwendung zweier aneinander angepasster Fresnellinsen zwischen der Lichtquelle und einer Abdeckung vor. Durch die Linsenanordnung kann das von der Lichtquelle emittierte Licht im Wesentlichen parallel aus der Abdeckung austreten. US 2004/0004836 offenbart eine Signallampe gemäß dem Oberbegriff des Anspruchs 1.In order to allow a uniform brightness over the viewing area with high luminosity, proposes the US 4,758,701 the use of two matched Fresnel lenses between the light source and a cover. Due to the lens arrangement, the light emitted by the light source can emerge from the cover substantially parallel. US 2004/0004836 discloses a signal lamp according to the preamble of claim 1.

Es ist Aufgabe der vorliegenden Erfindung, eine Kontrollleuchte, die insbesondere Bestandteil eines elektromechanischen Befehlsgeräts sein kann, anzugeben, welche baulich und/oder funktional weiter verbessert ist.It is an object of the present invention to provide a warning light, which may be part of an electromechanical command device in particular, which is structurally and / or functionally further improved.

Diese Aufgabe wird gelöst durch eine Kontrollleuchte gemäß den Merkmalen des Patentanspruches 1 sowie ein elektromechanisches Befehlsgerät gemäß den Merkmalen des Patentanspruches 9. Vorteilhafte Ausgestaltungen ergeben sich aus den abhängigen Patentansprüchen.This object is achieved by a control lamp according to the features of claim 1 and an electromechanical command device according to the features of claim 9. Advantageous embodiments will be apparent from the dependent claims.

Es wird eine Kontrollleuchte, insbesondere für ein elektromechanisches Befehlsgerät, vorgeschlagen. Die Kontrollleuchte umfasst ein Gehäuse sowie eine in dem Gehäuse angeordnete Lichtquelle, welche bei Energiezufuhr Licht emittiert. Ferner ist eine Linsenanordnung mit einer ersten Linseneinheit vorgesehen, welche in Ausbreitungsrichtung des von der Lichtquelle emittierten Lichts angeordnet und derart beschaffen ist, dass von der Lichtquelle emittierte Lichtstrahlen im Wesentlichen parallel aus einer von der Lichtquelle abgewandten Seite der ersten Linseneinheit austreten. Die von der Lichtquelle abgewandte Seite der ersten Linseneinheit stellt eine Austrittsfläche der ersten Linseneinheit dar. Im Wesentlichen erstreckt sich diese Austrittsfläche senkrecht zu einer Längsachse der Kontrollleuchte. Die Austrittsfläche der ersten Linseneinheit kann im Querschnitt einen stetigen oder auch einen nicht-stetigen Verlauf aufweisen. Insbesondere kann die Austrittsfläche aus einer Vielzahl an nicht-stetigen Teilflächen bestehen.It is a warning light, in particular for an electromechanical command device proposed. The control lamp comprises a housing and a light source arranged in the housing, which emits light when energized. Furthermore, a lens arrangement with a first lens unit is provided, which is arranged in the direction of propagation of the light emitted by the light source and arranged such that light rays emitted by the light source exit substantially parallel from a side facing away from the light source side of the first lens unit. The side facing away from the light source side of the first lens unit is an exit surface of the first lens unit. In essence, this exit surface extends perpendicular to a longitudinal axis of the indicator light. The exit surface of the first lens unit may have a continuous or a non-continuous profile in cross section. In particular, the exit surface can consist of a multiplicity of non-continuous partial surfaces.

Erfindungsgemäß umfasst die Linsenanordnung eine zweite Linse, die auf der von der Lichtquelle abgewandten Seite der ersten Linseneinheit angeordnet und derart beschaffen ist, dass ein Teil der aus der ersten Linseneinheit austretenden Lichtstrahlen bezüglich der parallelen Ausbreitungsrichtung zu einer transparenten Seitenoberfläche des Gehäuses gelenkt werden.According to the invention, the lens arrangement comprises a second lens, which is arranged on the side facing away from the light source side of the first lens unit and arranged such that a part of the emerging from the first lens unit light beams are directed with respect to the parallel propagation direction to a transparent side surface of the housing.

Die vorgeschlagene Kontrollleuchte ermöglicht nicht nur eine gleichförmige Helligkeit über die Betrachtungsfläche bei gleichzeitig hoher Leuchtkraft, sondern auch eine Beleuchtung an ihren Seitenflächen, so dass die Wahrnehmbarkeit der Beleuchtung der Kontrollleuchte auch unter großem Betrachtungswinkel gegeben ist. Wird die Kontrollleuchte insbesondere in sicherheitsrelevanten Anlagen eingesetzt, so trägt diese zu einem höheren Sicherheitsniveau anbei. Darüber hinaus wird die Wahrnehmbarkeit der beleuchteten Kontrollleuchte durch einen Nutzer als besser empfunden. Die beschriebenen Vorteile lassen sich dabei unter Nutzung einer herkömmlichen Glühbirne oder einer Leuchtdiode (LED) erzielen.The proposed warning light not only allows a uniform brightness over the viewing area with high luminosity, but also a lighting on their side surfaces, so that the visibility of the illumination of the indicator light is given even from a large viewing angle. If the indicator light is used especially in safety-relevant systems, this contributes to a higher level of safety. In addition, the visibility of the illuminated indicator light by a user is perceived as better. The advantages described can be achieved using a conventional light bulb or a light emitting diode (LED).

Die transparente Seitenoberfläche des Gehäuses, durch die ein Teil der Lichtstrahlen gelenkt wird, kann durch eine topfförmige, zum Beispiel eingefärbte, Abdeckkappe gebildet sein. Hierbei treten die durch die zweite Linse abgelenkten Lichtstrahlen durch die Seitenwände der Abdeckkappe hindurch. Die nicht abgelenkten Lichtstrahlen treten hingegen durch den Boden bzw. Deckel der Abdeckkappe. Der Boden bzw. Deckel bildet eine Betrachtungsfläche der Kontrollleuchte, welche wie üblich im Wesentlichen in einer Ebene senkrecht zur longitudinalen Ausbreitungsrichtung der Lichtstrahlen liegt.The transparent side surface of the housing, through which a part of the light rays is directed, may be formed by a cup-shaped, for example colored, cap. Here, the deflected by the second lens light rays pass through the side walls of the cap. The undeflected light rays, however, pass through the bottom or lid of the cap. The bottom or lid forms a viewing surface of the indicator light, which, as usual, lies substantially in a plane perpendicular to the longitudinal direction of propagation of the light rays.

Gemäß einer zweckmäßigen Ausgestaltung ist vorgesehen, dass die erste Linseneinheit zumindest eine, insbesondere asphärische, Fresnellinse umfasst. Die Verwendung einer Fresnellinse als erste Linseneinheit ermöglicht auf Platz sparende Weise, dass von der Lichtquelle emittierte Lichtstrahlen im Wesentlichen parallel aus der von der Lichtquelle abgewandten Seite der Fresnellinse Linse austreten. Insbesondere ist es hierdurch möglich, die Lichtquelle in kurzer Distanz zu der ersten Linseneinheit anzuordnen. Sofern die Platzverhältnisse in der Kontrollleuchte eine untergeordnete Rolle spielen, kann die erste Linseneinheit auch durch eine herkömmliche Linse mit konvexer Oberfläche auf der von der Lichtquelle abgewandten Seite ausgebildet sein. Durch die asphärische Gestalt können die bei sphärischen Linsen verursachte Abbildungsfehler gemindert werden. Erfindungsgemäß ist die zweite Linse ein prismatischer Ring, dessen Eintrittsfläche zumindest teilweise mit der Austrittsfläche der Lichtstrahlen der ersten Linseneinheit überlappt. Eine Überlappung der Eintrittsfläche des prismatischen Rings mit der Austrittsfläche der ersten Linseneinheit kann aus mechanischen Gründen zweckmäßig sein. Sollen möglichst viele aus der Austrittsfläche der ersten Linseneinheit austretende Lichtstrahlen durch den prismatischen Ring zur Seite umgelenkt werden, so kann die Eintrittsfläche auch vollständig mit der Austrittsfläche der ersten Linseneinheit überlappen.According to an expedient embodiment, it is provided that the first lens unit comprises at least one, in particular aspherical, Fresnel lens. The use of a Fresnel lens as a first lens unit allows space-saving manner that light rays emitted by the light source substantially parallel out of the side facing away from the light source side of the Fresnel lens exit. In particular, this makes it possible to arrange the light source at a short distance from the first lens unit. If the space conditions in the indicator light play a minor role, the first lens unit may also be formed by a conventional lens with a convex surface on the side facing away from the light source side. The aspherical shape can reduce the aberrations caused by spherical lenses. According to the invention, the second lens is a prismatic ring whose entrance surface overlaps at least partially with the exit surface of the light beams of the first lens unit. An overlap of the entry surface of the prismatic ring with the exit surface of the first lens unit may be expedient for mechanical reasons. If as many rays of light emerging from the exit surface of the first lens unit are to be deflected to the side by the prismatic ring, then the entrance surface may also completely overlap with the exit surface of the first lens unit.

In einer weiteren Ausgestaltung reflektiert die zweite Linse die in sie eintretenden Lichtstrahlen vollständig und lenkt diese um. Insbesondere braucht die zweite Linse gemäß dieser Ausgestaltung nicht dazu ausgebildet sein, die in sie eintretenden Lichtstrahlen zu reflektieren. Im Querschnitt weist der prismatische Ring die Gestalt eines Dreiecks, insbesondere eines gleichseitigen Dreiecks auf, so dass die in die Eintrittsfläche des prismatischen Rings eintretenden Lichtstrahlen in etwa in einem rechten Winkel reflektiert werden.In a further embodiment, the second lens completely reflects and deflects the light beams entering it. In particular, according to this embodiment, the second lens need not be designed to reflect the light beams entering it. In cross-section, the prismatic ring has the shape of a triangle, in particular an equilateral triangle, so that the light rays entering the entrance surface of the prismatic ring are reflected approximately at a right angle.

Es ist weiterhin zweckmäßig, wenn die Eintrittsfläche der zweiten Linse und die Austrittsfläche der ersten Linseneinheit parallel zueinander verlaufen. Insbesondere können die Eintrittsfläche der zweiten Linse und die Austrittsfläche der ersten Linseneinheit aneinandergrenzen. Hierdurch ist sichergestellt, dass die Umlenkung der in den prismatischen Ring eintretenden Lichtstrahlen in der gewünschten Weise erfolgt. Durch das aneinandergrenzen der Eintrittsfläche der zweiten Linse und der Austrittsfläche der ersten Linseneinheit lässt sich eine kompakte Kontrollleuchte schaffen.It is also expedient if the entrance surface of the second lens and the exit surface of the first lens unit are parallel to each other. In particular, the entrance surface of the second lens and the exit surface of the first lens unit may adjoin one another. This ensures that the deflection of the light rays entering the prismatic ring takes place in the desired manner. By adjoining the entrance surface of the second lens and the exit surface of the first lens unit, a compact warning light can be created.

Eine weitere Ausgestaltung der vorgeschlagenen Kontrollleuchte sieht vor, dass eine Austrittsfläche der zweiten Linse parallel zu einem transparenten Flächenabschnitt einer transparenten Abdeckkappe angeordnet ist und insbesondere an diese grenzt. Optional kann die Abdeckkappe eingefärbt sein. Die Aufgabe der Abdeckkappe besteht darin, einen mechanischen Schutz der Linsenanordnung bereitzustellen. Ist die Abdeckkappe eingefärbt, so kann eine bestimmte Signalwirkung durch die Wahl der Farbe hervorgerufen werden. Wie oben bereits erläutert, kann die Abdeckkappe eine topfförmige Gestalt aufweisen. Dabei treten die durch die zweite Linse abgelenkten Lichtstrahlen durch die Seitenwände hindurch, während die nicht abgelenkten Lichtstrahlen durch den Boden bzw. Deckel treten.A further embodiment of the proposed indicator light provides that an exit surface of the second lens is arranged parallel to a transparent surface portion of a transparent cap and in particular to this borders. Optionally, the cap can be colored. The purpose of the cap is to provide mechanical protection of the lens assembly. If the cap is colored, a certain signal effect can be caused by the choice of color. As already explained above, the cap can have a cup-shaped shape. At this time, the light beams deflected by the second lens pass through the side walls while the undeflected light beams pass through the bottom.

Gemäß einer weiteren Ausgestaltung umfasst das Gehäuse zwischen der Lichtquelle und der ersten Linseneinheit einen Lichtreflektionskörper, welcher von der Lichtquelle abgegebenes und/oder der ersten Linseneinheit reflektiertes Licht reflektiert. Der Lichtreflektionskörper ermöglicht eine gleichförmigere und gleichmäßigere Beleuchtung der Kontrollleuchte, wenn ein Betrachter in einem Winkel bezüglich der Längsachse der Kontrollleuchte, auf die Kontrollleuchte blickt.According to a further embodiment, the housing between the light source and the first lens unit comprises a light reflecting body, which reflects light emitted by the light source and / or reflected by the first lens unit. The light reflecting body allows a more uniform and uniform illumination of the warning light when a viewer looks at the warning light at an angle with respect to the longitudinal axis of the warning light.

Es ist besonders zweckmäßig, wenn zu diesem Zweck der Lichtreflektionskörper aus einem hellen und diffusiven Material gebildet ist. Besonders bevorzugt ist es, wenn der Lichtreflektionskörper aus einem weißen Material gebildet ist. Beispielsweise kann der Lichtreflektionskörper aus einem eingefärbten Kunststoff bestehen. Durch die helle Farbe und die dadurch bedingten Reflexionseigenschaften nimmt der Lichtreflektionskörper die Funktion einer "sekundären" Lichtquelle bezüglich eines schrägen Betrachtungswinkels an.It is particularly useful if, for this purpose, the light reflection body is formed from a light and diffusive material. It is particularly preferred if the light reflection body is formed from a white material. For example, the light reflecting body may consist of a colored plastic. Due to the light color and the resulting reflection properties of the light reflection body assumes the function of a "secondary" light source with respect to an oblique viewing angle.

Gemäß einer weiteren zweckmäßigen Ausgestaltung erweitert sich der Lichtreflektionskörper von der Lichtquelle zu der ersten Linseneinheit konus-förmig. Hierdurch können das von der Lichtquelle abgegebene Licht sowie das gegebenenfalls an der Linsenanordnung reflektierte Licht in der gewünschten Weise von dem Lichtreflektionskörper zur Ausbildung der sekundären Lichtquelle reflektiert werden.According to a further expedient embodiment, the light reflection body extends from the light source to the first lens unit in a cone shape. As a result, the light emitted by the light source as well as the optionally reflected light at the lens assembly can be reflected in the desired manner by the light reflecting body to form the secondary light source.

Die Erfindung schafft ferner ein elektromechanisches Befehlsgerät, der einen Drucktaster oder -schalter mit einer Kontrollleuchte der oben beschriebenen Art umfasst. Im Gegensatz zu einer passiven Kontrollleuchte ermöglicht es ein elektromechanisches Befehlsgerät, durch dessen Betätigung aktiv einen Schaltbefehl zu geben. Beispielsweise kann durch das Befehlsgerät eine Maschine ein- oder ausgeschaltet oder eine bestimmte Funktion aktiviert oder deaktiviert werden. Der Aufbau eines elektromechanischen Befehlsgeräts kann auf unterschiedlichste Weise realisiert werden und ist für die vorliegende Erfindung von untergeordneter Bedeutung. Ein beispielhafter Aufbau eines Befehlsgeräts kann beispielsweise der eingangs erwähnten Druckschrift US 4,758,701 entnommen werden.The invention further provides an electromechanical control device comprising a pushbutton or switch with a control lamp of the type described above. In contrast to a passive indicator light, an electromechanical command device makes it possible to actively give a switching command by actuating it. For example, the command device can be used to switch a machine on or off or to activate or deactivate a specific function. The structure of an electromechanical control device can be realized in many different ways and is of minor importance to the present invention. An exemplary structure of a command device, for example, the above-mentioned document US 4,758,701 be removed.

Die Erfindung wird nachfolgend näher anhand eines Ausführungsbeispiels in der Zeichnung erläutert. Es zeigen:

Fig. 1
eine Querschnittsdarstellung einer erfindungsgemäßen Kontrollleuchte,
Fig. 2
eine vergrößerte Querschnittsdarstellung eines Ausschnitts der in Fig. 1 dargestellten Kontrollleuchte zur Illustration der aus der Kontrollleuchte ausgeleiteten Lichtstrahlen, und
Fig. 3
eine prinzipiell bekannte Projektion der von einer Lichtquelle ausgehenden Lichtstrahlen durch eine Linsenanordnung, durch die die Lichtstrahlen in das Unendliche projiziert werden.
The invention will be explained in more detail below with reference to an embodiment in the drawing. Show it:
Fig. 1
a cross-sectional view of a control lamp according to the invention,
Fig. 2
an enlarged cross-sectional view of a section of in Fig. 1 shown indicator light to illustrate the led out of the indicator light beams, and
Fig. 3
a principle known projection of the emanating from a light source light rays through a lens assembly through which the light rays are projected into the infinite.

In den Figuren sind gleiche Elemente mit den gleichen Bezugszeichen versehen.In the figures, the same elements are provided with the same reference numerals.

Fig. 1 zeigt eine Querschnittsdarstellung einer erfindungsgemäßen Kontrollleuchte 100. Die Kontrollleuchte 100 umfasst ein zylinderförmiges Gehäuse 1, in dem eine Lichtquelle 2 angeordnet ist. Die Lichtquelle 2 kann beispielsweise eine Glühbirne oder eine Leuchtdiode sein. Eine Längsachse des zylinderförmigen Gehäuses 1 ist mit dem Bezugszeichen 3 gekennzeichnet. Die Lichtquelle 2 liegt auf der Längsachse 3. Von der Lichtquelle 2 emittiertes Licht erstreckt sich in einer im Wesentlichen longitudinalen Ausbreitungsrichtung in Richtung eines äußeren Endes 4 des Gehäuses 1. Fig. 1 shows a cross-sectional view of a control lamp 100 according to the invention. The indicator 100 includes a cylindrical housing 1, in which a light source 2 is arranged. The light source 2 may be, for example, a light bulb or a light emitting diode. A longitudinal axis of the cylindrical housing 1 is identified by the reference numeral 3. The light source 2 lies on the longitudinal axis 3. Light emitted by the light source 2 extends in a direction of an essentially longitudinal propagation in the direction of an outer end 4 of the housing 1.

An dem äußeren Ende 4 des Gehäuses 1 ist eine Linsenanordnung 5 angebracht. Auf der von der Lichtquelle 2 abgewandten Seite der Linsenanordnung 5 ist eine Abdeckkappe 13 angeordnet. Die Abdeckkappe 13 weist eine topfförmige Gestalt auf und umschließt die Linsenanordnung 5. Die Abdeckkappe 13 ist mit ihren seitlichen Flanken bzw. ihrer Seitenfläche 12 mit dem äußeren Ende 4 des Gehäuses 1, gegebenenfalls lösbar, verrastet. Über die Verrastung kann die Linsenanordnung 5 in der Kontrollleuchte 100 fixiert sein.At the outer end 4 of the housing 1, a lens assembly 5 is mounted. On the side facing away from the light source 2 side of the lens assembly 5, a cap 13 is arranged. The cap 13 has a pot-shaped shape and surrounds the lens assembly 5. The cap 13 is with its lateral flanks or its side surface 12 with the outer end 4 of the housing 1, optionally releasably latched. About the locking the lens assembly 5 may be fixed in the indicator 100.

Die Abdeckkappe 13 besteht aus einem transparenten und optional eingefärbten Material. Gegebenenfalls kann sich auch zwischen der Linsenanordnung 5 und einer Betrachtungsfläche 14 der dann vorzugsweise nicht-farbigen Abdeckkappe 13 eine eingefärbte Platte befinden, um eine entsprechend der Farbe erwünschte Signalwirkung zu erzielen.The cap 13 is made of a transparent and optionally colored material. Optionally, there may be a colored plate between the lens assembly 5 and a viewing surface 14 of the then preferably non-colored cap 13 in order to achieve a desired signal effect according to the color.

Die Linsenanordnung 5 umfasst eine erste Linseneinheit 6 sowie eine zweite Linse 7. Die Linseneinheit 6 kann durch eine einzelne Linse oder eine Mehrzahl an Linsen gebildet sein. Eine Eintrittsfläche der Lichtstrahlen der Linseneinheit 6 ist mit dem Bezugszeichen 8 gekennzeichnet. Das Austreten der Lichtstrahlen erfolgt über eine Lichtaustrittsfläche 9 auf der von der Lichtquelle 2 abgewandten Seite der Linseneinheit 6. Die Linseneinheit 6 ist derart beschaffen, dass von der Lichtquelle 2 emittierte Lichtstrahlen im Wesentlichen parallel aus der Austrittsfläche 9 austreten. Hierdurch erfolgt eine Projektion der von der Lichtquelle 2 punktförmig ausgehenden Lichtstrahlen in das Unendliche.The lens assembly 5 comprises a first lens unit 6 and a second lens 7. The lens unit 6 may be formed by a single lens or a plurality of lenses. An entrance surface of the light beams of the lens unit 6 is designated by the reference numeral 8. The light beams exit via a light exit surface 9 on the side of the lens unit 6 facing away from the light source 2. The lens unit 6 is such that light beams emitted by the light source 2 exit the exit surface 9 substantially parallel. This is done a projection of the point of light emanating from the light source 2 light rays into the infinite.

Dies ist schematisch in Fig. 3 dargestellt. Ausgehend von der nicht näher dargestellten Lichtquelle (vergleiche Bezugszeichen 2 in Fig. 1) erstrecken sich die von der punktförmigen Lichtquelle emittierten Lichtstrahlen 18 in Richtung der Linseneinheit 6 und treten durch die Eintrittsfläche 8 in die Linseneinheit 6 ein. Dabei werden die Lichtstrahlen 18 an der Eintrittsfläche (d.h. einer ersten optischen Fläche) abgelenkt. Eine weitere Ablenkung der Lichtstrahlen 18 erfolgt nach dem Durchqueren des Inneren der Linse 6 an einer Lichtaustrittsfläche 9 (zweite optische Fläche). Durch die Gestalt der Linseneinheit 6 (welche eine einzelne Linse oder einer Mehrzahl an Linsen sein kann) werden die Lichtstrahlen 18 in der gewünschten Weise in das Unendliche abgelenkt. Dies bedeutet, die aus der Lichtaustrittsfläche 9 austretenden Lichtstrahlen 18 verlaufen in etwa parallel. Hierdurch ergibt sich in einer Ebene senkrecht zur Längsachse 3 eine gleichförmige Beleuchtung.This is schematically in Fig. 3 shown. Starting from the light source not shown in detail (compare reference 2 in Fig. 1 ), the light beams 18 emitted from the point light source extend in the direction of the lens unit 6 and enter the lens unit 6 through the entrance surface 8. In this case, the light beams 18 are deflected at the entrance surface (ie, a first optical surface). A further deflection of the light beams 18 takes place after passing through the interior of the lens 6 at a light exit surface 9 (second optical surface). The shape of the lens unit 6 (which may be a single lens or a plurality of lenses) deflects the light rays 18 into the infinite in the desired manner. This means that the light rays 18 emerging from the light exit surface 9 extend approximately parallel. This results in a plane perpendicular to the longitudinal axis 3, a uniform illumination.

Der gleiche Effekt wird erzielt, wenn die Linseneinheit 6 durch eine einzelne Fresnellinse ausgebildet wird. Die Verwendung einer Fresnellinse ermöglicht es insbesondere, den Abstand zwischen der Lichtquelle 2 und der Linseneinheit 6 sehr klein auszugestalten. Ein weiterer Vorteil der Fresnellinse besteht darin, dass diese im Gegensatz zu der in Fig. 3 dargestellten Linseneinheit 6 sehr flach baut, wodurch sich kompakte Kontrollleuchten 100 realisieren lassen. Bei der in Fig. 1 dargestellten erfindungsgemäßen Kontrollleuchte wird daher bevorzugt eine Fresnellinse als Linseneinheit 6 eingesetzt.The same effect is achieved when the lens unit 6 is formed by a single Fresnel lens. The use of a Fresnel lens makes it possible in particular to make the distance between the light source 2 and the lens unit 6 very small. Another advantage of the Fresnel lens is that in contrast to the in Fig. 3 illustrated lens unit 6 is very flat, which can be 100 compact control lights realized. At the in Fig. 1 therefore, a Fresnel lens is preferably used as the lens unit 6.

Hierdurch ist sichergestellt, dass die Betrachtungsfläche 14 der Abdeckkappe 13 gleichförmig ausgeleuchtet wird. Die gleichförmige Ausleuchtung ergibt sich bei der in Fig. 1 dargestellten Kontrollleuchte 100 dabei nicht nur dann, wenn sich der Betrachter auf der Längsachse 3 befindet. Vielmehr ist die gleichförmige Ausleuchtung der Betrachtungsfläche 14 auch dann gegeben, wenn die Betrachtung der Betrachtungsfläche 14 aus einem Winkel erfolgt.This ensures that the viewing surface 14 of the cap 13 is uniformly illuminated. The uniform illumination results in the in Fig. 1 shown indicator light 100 not only when the observer is on the longitudinal axis 3. Rather, the uniform illumination of the viewing surface 14 is also given when the viewing surface 14 is viewed from an angle.

Unterstützt wird die gleichförmige Ausleuchtung durch einen zwischen der Lichtquelle 2 und der Linseneinheit 6 angeordneten Lichtreflektionskörper 15, der im Querschnitt die Gestalt eines Konus aufweist. Wie aus Fig. 1 ersichtlich ist, erweitert sich der Konus von der Lichtquelle 2 zu der Linseneinheit 6 hin. Der Lichtreflektionskörper 15 reflektiert von der Lichtquelle 2 abgegebenes und/oder der Linseneinheit 6 reflektiertes Licht. Vorzugsweise besteht der Lichtreflektionskörper 15 aus einem hellen und diffusiven Material. Besonders gute Reflexionseigenschaften ergeben sich dann, wenn der Lichtreflektionskörper weiß ist. Beispielsweise wird der Lichtreflektionskörper 15 aus einem weißen Kunststoff gefertigt.The uniform illumination is supported by a arranged between the light source 2 and the lens unit 6 light reflection body 15, which has the shape of a cone in cross section. How out Fig. 1 it can be seen, the cone widens from the light source 2 to the lens unit 6. The light reflection body 15 reflects light emitted by the light source 2 and / or reflected by the lens unit 6. Preferably, the light reflecting body 15 is made of a light and diffusive material. Particularly good reflection properties arise when the light reflection body is white. For example, the light reflecting body 15 is made of a white plastic.

Der Lichtreflektionskörper 15 stellt insbesondere aus schrägen Betrachtungswinkeln, eine "sekundäre" Lichtquelle dar. Unter einem schrägen Betrachtungswinkel wird hierbei eine Betrachtung der Kontrollleuchte 100 verstanden, die von außerhalb der Längsachse 3 erfolgt. Es hat sich gezeigt, dass die gleichförmige Beleuchtungswirkung der Betrachtungsfläche 14 bis zu einem Betrachtungswinkel 17 von 60° bezüglich der Längsachse 3 bzw. einer Parallelen dazu erhalten bleibt. Der Lichtreflektionskörper 15 könnte auch parabol-örmig ausgebildet sein. Aus Fertigungsgründen ist jedoch die Gestalt eines Konus zu bevorzugen.The light reflection body 15 represents, in particular from oblique viewing angles, a "secondary" light source. In this case, an oblique viewing angle is understood as a viewing of the indicator light 100, which takes place from outside the longitudinal axis 3. It has been found that the uniform illumination effect of the viewing surface 14 is maintained up to a viewing angle 17 of 60 ° with respect to the longitudinal axis 3 or a parallel thereto. The light reflecting body 15 could also be formed parabolic-shaped. For manufacturing reasons, however, the shape of a cone is to be preferred.

Durch die zweite Linse 7 der Linsenanordnung 5 kann ein Teil der aus der ersten Linseneinheit 6 austretenden Lichtstrahlen bezüglich der longitudinalen Ausbreitungsrichtung, d.h. der Längsachse, zu der transparenten Seitenoberfläche 12 der Abdeckkappe 13 gelenkt werden. Zu diesem Zweck ist die zweite Linse 7 als prismatischer Ring ausgebildet, während Eintrittsfläche 10 zumindest teilweise mit der Austrittsfläche 9 der Lichtstrahlen der Linseneinheit 6 überlappt. Eine solche teilweise Überlappung ist in Fig. 1 dargestellt. Dabei liegt der prismatische Ring zum Teil auf einer Stirnfläche des äußeren Randes 4 des Gehäuses 1 auf.By means of the second lens 7 of the lens arrangement 5, part of the light beams emerging from the first lens unit 6 can be directed with respect to the longitudinal propagation direction, ie the longitudinal axis, to the transparent side surface 12 of the cover cap 13. For this purpose, the second lens 7 is formed as a prismatic ring, while entrance surface 10 at least partially overlaps with the exit surface 9 of the light beams of the lens unit 6. Such a partial overlap is in Fig. 1 shown. In this case, the prismatic ring is partially on an end face of the outer edge 4 of the housing 1.

In einer Abwandlung dieser Ausgestaltung könnte der prismatischer Ring 7 auch derart auf der Linseneinheit 6 angeordnet sein, dass die Eintrittsfläche 10 der Linse 7 vollständig mit der Austrittsfläche 9 der Linseneinheit 6 überlappt.In a modification of this embodiment, the prismatic ring 7 could also be arranged on the lens unit 6 such that the entrance surface 10 of the lens 7 completely overlaps with the exit surface 9 of the lens unit 6.

Wie aus der Querschnittsdarstellung der Fig. 1 ohne weiteres ersichtlich ist, weist der prismatische Ring 7 im Querschnitt die Gestalt eines in etwa gleichschenkligen Dreiecks auf. Hierdurch reflektiert die Linse 7 die in sie eintretenden Lichtstrahlen vollständig und lenkt diese in Richtung der Seitenflächen 12 der Abdeckkappe 13 um. Gleichzeitig wird im Bereich der prismatischen Linse 7 ein Lichtaustritt im Bereich der Betrachtungsfläche 14 verhindert. Hierdurch ergibt sich ein dunkler Ring, welcher die Wahrnehmung des seitlich aus der Abdeckkappe 13 austretenden Lichts verstärkt.As seen from the cross section of the Fig. 1 is readily apparent, the prismatic ring 7 in cross-section on the shape of an approximately isosceles triangle. As a result, the lens 7 completely reflects the light beams entering it and deflects them in the direction of the side surfaces 12 of the cap 13. At the same time, a light emission in the region of the viewing surface 14 is prevented in the region of the prismatic lens 7. This results in a dark ring, which enhances the perception of the side emerging from the cap 13 light.

Im Ergebnis kann die Beleuchtung der Kontrollleuchte 100 nicht nur aus Richtung der Längsachse und innerhalb des oben beschriebenen Betrachtungswinkels wahrgenommen werden, sondern auch bei einer vollkommenen seitlichen Betrachtung der Kontrollleuchte 100.As a result, the illumination of the control lamp 100 can be perceived not only from the direction of the longitudinal axis and within the above-described viewing angle, but also from a complete lateral view of the indicator lamp 100.

Fig. 2 zeigt in einer vergrößerten Darstellung das Beleuchtungskonzept der Kontrollleuchte 100 im Bereich der Abdeckkappe 13. Wie ohne weiteres ersichtlich ist, ergibt sich im Bereich der Betrachtungsfläche 14 ein klar abgegrenzter, kreisförmig beleuchteter Bereich. Der Übergang von einem beleuchteten Bereich 19 der Betrachtungsfläche 14 zu einem nicht ausgeleuchteten Bereich, der als dunkler Ring 16 wahrnehmbar ist, ist mit dem Bezugszeichen 20 gekennzeichnet. Der dunkle Ring 16, der die kreisförmig illuminierte Betrachtungsfläche 14, umgibt, ist durch das Vorhandensein der prismatischen Linse 7 hervorgerufenen ist. Die Flanken bzw. Seitenflächen 12 der Abdeckkappe 13 sind demgegenüber wieder aufgrund des Vorhandenseins des prismatischen Rings 7 beleuchtet. Dies ist mit dem Bezugszeichen 19 gekennzeichnet. Fig. 2 shows in an enlarged view the lighting concept of the indicator 100 in the region of the cap 13. As can be readily seen, results in the area of the viewing surface 14 is a clearly demarcated, circular illuminated area. The transition from an illuminated area 19 of the viewing area 14 to an unilluminated area, which is perceivable as a dark ring 16, is identified by the reference numeral 20. The dark ring 16, the circular illuminated viewing area 14, is caused by the presence of the prismatic lens 7. The flanks or side surfaces 12 of the cap 13 are in contrast illuminated again due to the presence of the prismatic ring 7. This is indicated by the reference numeral 19.

In Fig. 3 ist darüber hinaus der bereits erwähnte Betrachtungswinkel 17 gegenüber einer Parallelen 3' zur Längsachse 3 dargestellt. Verläuft die Parallele 3' durch die Grenze 20, so markiert der Betrachtungswinkel 17 zur Außenseite hin den Übergang zwischen dem beleuchteten Bereich 19 und dem nichtbeleuchteten Bereich 16.In Fig. 3 In addition, the already mentioned viewing angle 17 with respect to a parallel 3 'to the longitudinal axis 3 is shown. If the parallel 3 'passes through the boundary 20, the viewing angle 17 marks the transition between the illuminated area 19 and the non-illuminated area 16 to the outside.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Gehäusecasing
22
Lichtquellelight source
33
Längsachselongitudinal axis
3'3 '
Parallele zur LängsachseParallel to the longitudinal axis
44
äußeres Ende des Gehäusesouter end of the housing
55
Linsenanordnunglens assembly
66
Linseneinheitlens unit
77
zweite (prismatische) Linsesecond (prismatic) lens
88th
Lichteintrittsfläche der Linseneinheit 6Light entrance surface of the lens unit 6
99
Lichtaustrittsfläche der Linseneinheit 6Light exit surface of the lens unit 6
1010
Lichteintrittsfläche der prismatischen Linse 7Light entrance surface of the prismatic lens 7
1111
Lichtaustrittsfläche der prismatischen Linse 7Light exit surface of the prismatic lens 7
1212
seitliche Flanken der Abdeckkappelateral flanks of the cap
1313
Abdeckkappecap
1414
Betrachtungsflächeviewing area
1515
LichtreflektionskörperLight reflection body
1616
dunkler Ringdark ring
1717
Betrachtungswinkelviewing angle
1818
Lichtstrahlbeam of light
1919
beleuchteter Bereichilluminated area
2020
Grenze zwischen beleuchtetem und nicht-beleuchtetem BereichBorder between illuminated and non-illuminated area
100100
Kontrollleuchteindicator light

Claims (9)

  1. Indicator lamp, in particular for an electromechanical command device, comprising
    - a housing (1);
    - a light source (2) arranged in the housing (1), which emits light when supplied with energy;
    - a lens arrangement (5) comprising a first lens unit (6), which is arranged in the propagation direction of the light emitted by the light source (2) and is of such a nature that light beams emitted by the light source (2) emerge substantially in parallel from a side of the first lens unit (6) that faces away from the light source (2),
    characterized in that
    - the lens arrangement (5) comprises a second lens (7), which is arranged on the side of the first lens unit (6) that faces away from the light source (2) and is of such a nature that some of the light beams emerging from the first lens unit (6) are directed with respect to the parallel propagation direction toward a transparent side surface of the housing (1), wherein the second lens (7) is a prismatic ring, the entry surface (10) of which at least partly overlaps an exit surface (9) of the light beams from the first lens unit (6) .
  2. Indicator lamp according to Claim 1, characterized in that the first lens unit (6) comprises at least one, in particular aspherical, Fresnel lens.
  3. Indicator lamp according to Claim 1, characterized in that the second lens (7) completely reflects and deflects the light beams entering it.
  4. Indicator lamp according to Claim 1 or 3, characterized in that the entry surface (10) of the second lens (7) and the exit surface (9) of the first lens unit (6) run parallel to each other and in particular adjoin each other.
  5. Indicator lamp according to one of the preceding claims, characterized in that an exit surface (11) of the second lens (7) is arranged parallel to a transparent surface section of a transparent and optionally coloured covering cap (15) and in particular adjoins the latter.
  6. Indicator lamp according to one of the preceding claims, characterized in that the housing (1) between the light source (2) and the first lens unit (6) comprises a light reflection element (15), which reflects light emitted by the light source (2) and/or light reflected by the first lens unit (6).
  7. Indicator lamp according to Claim 6, characterized in that the light reflection element (15) is formed from a light, in particular white, and diffusive material.
  8. Indicator lamp according to Claim 6 or 7, characterized in that the light reflection element (15) widens conically from the light source (2) towards the first lens unit (6).
  9. Electromechanical command device comprising a pushbutton (10), which comprises an indicator lamp (100) according to one of the preceding claims.
EP12809627.8A 2012-11-20 2012-11-20 Indicator lamp Active EP2850362B1 (en)

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US20150255230A1 (en) 2015-09-10
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CN104641169A (en) 2015-05-20
WO2014079481A1 (en) 2014-05-30

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