DE202013010472U1 - Suspension for spotlights with lighting purpose - Google Patents

Abstract

Light-directing device for spotlights with illumination purpose, characterized in that directly above a lighting means (1) a clear, convex lens (2) is mounted. Furthermore, characterized in that the lens and illuminant are surrounded by a screen (3) made of translucent or transparent material, which is designed as a flat body, wherein the thickness (6) of the flat screen (3) at least the distance between the light source (1) and Lens (2) corresponds and further wherein the screen is mounted approximately parallel to the light entry surface (4) of the lens (2) and to the exit surface (5) of the illuminant (1). Finally, characterized in that at least one outer surface (7) of the screen (3) is dull, wherein the matting is ensured by the topography of the surface or by a diffustransluzente nature of the material of the screen (3).

Description

• a. Bekannt sind trichter- oder parabelförmige Reflektoren. Ihnen haftet der Nachteil an, dass das Licht ausschließlich in eine Richtung gelenkt wird. Beim Einsatz in einem Deckenstrahler etwa ist es es nicht möglich, gleichzeitig eine Aufhellung der Decke zu bewerkstelligen. Dies gilt insbesondere dann, wenn als Leuchtmittel LED verwendet werden. Auch kann der Reflektor das Licht nur in der definierten Abstrahlrichtung lenken, wobei die hohe Leuchtdichte des Leuchtmittels erhalten bleibt. Nicht möglich ist die teilweise Abstrahlung von diffusem Licht mit geringerer Leuchtdichte.
• b. Bekannt sind ferner sog. TIR-Reflektoren, die mit Totalreflektion arbeiten. Sie werden insbesondere zusammen mit LED eingesetzt. Die unter 1. genannten Nachteile gelten auch hier. Ferner ist nachteilig, dass die TIR-Reflektoren fertigungsbedingt nur in begrenzten Abmessungen zu fertigen sind und mithin nicht für starke Lichtquellen, welche eine größere Lichtaustrittsfläche aufweisen, geeignet sind. Bei Strahlern mit hoher Leuchtkraft mündet dies in den Zwang, die starke Lichtquelle durch mehrere schwache zu ersetzen, was mit erhöhtem Fertigungsaufwand verbunden ist.
• c. Außerdem ist es bekannt, konvexe Linsen zur Bündelung des Lichtes einzusetzen. Diese Lösung wird häufig verwendet, wenn LED als Lichtquelle dienen. Da die Strahlungscharakteristik von LED dem sog. Lambertschen Strahler nahe kommen, tritt bei LED stets ein gewisser Anteil des Lichtes in einem flachen Winkel aus, wobei unter flachen Winkeln solche zu verstehen sind, deren Abweichung von der Hauptaustrittsrichtung des Lichtes nahe unter 90° liegt. Nachteilig ist, dass dieses flach austretende Licht mit der Linse nicht genutzt werden kann. Zwar könnte durch eine konkave Form der Linse an der dem Leuchtmittel zugewandten Seite erreicht werden, dass alles Licht in die Linse eintritt, jedoch ließen sich dann die flachsten Lichtstrahlen nicht hinreichend umlenken, so dass für übliche Beleuchtungsanwendungen keine ausreichende Entblendung mehr gewährleistet wäre.
• d. Bekannt sind auch solche Anordnungen wie sie in der Offenlegungsschrift zum Aktenzeichen DE 10 2006 016 218.8 gezeigt werden. Hier wird die Lichtlenkung erzielt durch eine Abdeckung aus transluzentem Material, die unmittelbar über dem Leuchtmittel eine Öffnung aufweist, durch welche ein direkt abgestrahlter Lichtkegel austreten kann. Das durch die Abdeckung zuückgehaltene Licht wird durch das transluzente Material diffus abgestrahlt.

For spotlights, which are attached for example to ceilings, busbars and the like, numerous devices for bundling and steering the luminous flux are known. Important known solutions are listed as follows:

• a. Funnel-shaped or parabolic reflectors are known. You have the disadvantage that the light is directed in one direction only. When used in a ceiling spotlight, for example, it is not possible at the same time to bring about a whitening of the ceiling. This applies in particular if LEDs are used as the light source. Also, the reflector can direct the light only in the defined emission direction, wherein the high luminance of the lamp is maintained. Not possible is the partial emission of diffuse light with lower luminance.
• b. Also known are so-called. TIR reflectors that work with total reflection. They are used in particular together with LED. The disadvantages mentioned under 1. also apply here. Furthermore, it is disadvantageous that the TIR reflectors are manufactured due to production only in limited dimensions and therefore not suitable for strong light sources, which have a larger light exit surface. For spotlights with high luminosity this leads to the compulsion to replace the strong light source with several weak, which is associated with increased manufacturing costs.
• c. It is also known to use convex lenses to focus the light. This solution is often used when LEDs serve as the light source. Since the radiation characteristic of LED come close to the so-called Lambertian emitter, in LED a certain amount of light always emerges at a shallow angle, whereby at flat angles those are to be understood whose deviation from the main exit direction of the light is close to 90 °. The disadvantage is that this flat emergent light can not be used with the lens. Although it could be achieved by a concave shape of the lens on the side facing the bulb that all light enters the lens, but then the thinnest rays of light could not deflect sufficiently, so that for normal lighting applications no sufficient glare would be guaranteed.
• d. Such arrangements are also known as in the patent application for file number DE 10 2006 016 218.8 to be shown. Here, the light control is achieved by a cover made of translucent material, which has an opening immediately above the bulb, through which a directly emitted light cone can escape. The light retained by the cover is diffused by the translucent material.

The disadvantage is that the division between directly and diffusely emitted light component is hardly selectable. In order to achieve adequate glare reduction of the directly emitted light cone, the opening in the light-scattering body must be sufficiently reduced. Any light not directly exiting through the opening will inevitably be converted into diffuse radiation. The disadvantage is that depending on the application there is a risk that the diffuse component is too large and causes glare. A reduced direct glare is thus bought with increased diffuse glare or vice versa.

Although this arrangement achieves ceiling illumination, since part of the diffused light also reaches the ceiling, however, due to the diffuse nature, this occurs only in the immediate vicinity of the luminaire. The latter local limitation of Deckenunterleuchtung is also to be regarded as disadvantageous.

The invention has for its object to provide a light guide, which also uses the exiting at a shallow angle from a light beams for the lighting task. Furthermore, it should be able to emit a portion of the lumen output as a diffused light, with different percentage divisions between direct and diffused emitted light should be possible. In particular, the invention should be able to the diffuse fraction compared to the under d. to reduce said arrangement. All the advantages mentioned are to be achieved in a comparatively flat design.

The object is solved by the features of the invention according to claim 1.

The illustration 1 shows an embodiment of the invention according to claims 1, 2, 4, 8, 9, 10th

The advantage achieved by the invention according to claim 1 is that even those light beams, which leave the light source at a shallow angle are used, also in that the arrangement is able to emit even diffused light and that the division between direct and diffused light can be changed by varying the dimensions of the individual components in a wide range. The glare from direct radiation can be turned off without having to accept glare from diffuse radiation, since only those light rays that leave the light source at a very shallow angle are used wholly or partly for diffuse radiation. Finally, it should be regarded as an advantage that the stated advantages are achieved with a comparatively flat design.

In the embodiment according to claim 3, several lamps and lenses are used side by side. This has the advantage that the single lens can be made smaller and thus the entire arrangement can be made flatter.

An embodiment according to claims 2 and 4 is such that light rays ( 12 ) of the illuminant in the screen ( 3 ) and then possibly a total reflection on one or more outer surfaces ( 13 ) of the screen. Many of these rays eventually strike a frosted outer surface of the screen and are diffused ( 15 ). In contrast to a translucent, but not transparent material of the screen, there is the advantage here that a more uniform diffuse brightness can be achieved.

The embodiment with translucent material according to claim 5 has the advantage that a machining of the surface of the screen is eliminated and thus the production is simplified.

Similarly, the combination of several lenses in a part according to claim 6 leads to a simplified production, since they can be performed as a plastic injection molded part about.

The embodiment according to claim 7 has the advantage that a stronger bundling of the direct luminous flux can be achieved by a multi-part lens.

An embodiment according to claim 8

In particular, the union of the outer lens ( 8th ) with the screen ( 3 ) has the advantage that the light beam of the internal radiation can be changed by using different inner lenses without having to change the larger part, the screen, with the outer lens. The invention can thus be customized application-specific with low production costs.

The circular according to claim 9 embodiment of the screen ( 3 ) also has advantages in terms of manufacturing. There are also advantages through easier ceiling mounting.

Finally, the embodiment according to claim 10 is able to receive a beam coming from the illuminant at a shallow angle into the screen, to guide it through the latter and to direct it in an angle selectable by the inclination of the edge of the screen in the direction of a plane behind the illuminant ( 14 ). So it is possible, for example in an application as a ceiling downlight possible to lighten a defined area of the ceiling.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102006016218 A [0001]

Claims (10)

Light-directing device for spotlights with illumination purpose, characterized in that directly above a light source ( 1 ) a clear, convex lens ( 2 ) is attached. Furthermore characterized in that the lens and the illuminant are surrounded by a screen ( 3 ) made of translucent or transparent material, which is designed as a flat body, wherein the thickness ( 6 ) of the flat screen ( 3 ) at least the distance between lamps ( 1 ) and lens ( 2 ) and further wherein the screen is approximately parallel to the light entry surface ( 4 ) of the lens ( 2 ) and the exit surface ( 5 ) of the illuminant ( 1 ) is attached. Finally, characterized in that at least one outer surface ( 7 ) of the screen ( 3 ) is dull, the matting being due to the topography of the surface or to a diffusely translucent nature of the material of the screen ( 3 ). Device according to claim 1, characterized in that the space between the light entry surface ( 4 ) of the lens ( 2 ) and the exit surface ( 5 ) of the illuminant ( 1 ) remains largely free and the adjoining inner surfaces ( 11 ) of the screen with a deviation of the highest + -20 ° perpendicular to the light entry surface ( 4 ) of the lens ( 2 ) and the exit surface ( 5 ) of the illuminant ( 1 ) stand. Device according to claim 1 or 2, characterized in that the screen ( 3 ) with several lenses ( 2 ) and illuminants ( 1 ) is provided. Apparatus according to claim 1, 2 or 3, characterized in that the screen is made of transparent material. Device according to claim 1, 2 or 3, characterized in that the screen ( 3 ) is made of translucent, but not transparent material. Device according to one of claims 1 to 5, characterized in that a plurality of lenses are interconnected and designed as a single part. Device according to one of claims 1 to 6, characterized in that the lens is made in several parts by the inner lens ( 2 ) are supplemented by one or more outer lenses, wherein these lenses are arranged one above the other, so that light rays coming from the light source initially the inner ( 2 ) and then other lenses ( 8th ) run through. Device according to one of claims 1, 2, 3, 4, 6, 7, characterized in that the inner lens or lenses ( 2 ) or the outer lens or lenses ( 8th ) together with the screen ( 3 ) consist of a single part. Device according to one of claims 1, 2, 3, 4, 6, 7, 8, characterized in that the edge surface ( 9 ) of the screen ( 3 ) is tapered so as to taper outwardly in the direction of the bulb, wherein tapering means a reduction in diameter, and further wherein the contour of the taper is straight or slight curvature and generally at an angle of 0 ° to 45 ° Vertical is executed. Device according to one of claims 1 to 9, characterized in that the screen is designed circular.

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