DE102021113431A1 - Optical system for a lamp and lamp with such a system - Google Patents

Abstract

The invention relates to an optical system for an elongate lamp, comprising an elongate reflector comprising a support section, on which an arrangement of lamps is arranged, as well as reflector side sections spaced apart from one another in the transverse direction and running in the longitudinal direction by the support section, a first, elongate optical element, which is provided with a flat Covering section closes off the reflector, with side sections of the first optical element which are spaced apart from one another in the transverse direction and running in the longitudinal direction, to which the reflector is attached, adjoin a second, elongated and flat optical element which, on the reflector side, is attached to the covering section of the first optical element is arranged and in each case a longitudinal end side to the reflector arranged and attached to this head element. The optical system according to the invention is characterized in that the second optical element is supported on the first optical element, and that the respective head element rests with an inner side section on an assigned end face of the second optical element and is designed and arranged such that, in the event of an operational change in length of the second optical element in the longitudinal direction, its inner side section rests without a gap on the assigned To maintain end face of the second optical element by tracking the inner side portion. The invention also relates to a lamp which includes such an optical system.

Description

The invention relates to an optical system for an elongate lamp, comprising an elongate reflector with a support section, on which an arrangement of lamps is arranged, as well as reflector side sections spaced apart from one another in the transverse direction and running in the longitudinal direction by the support section, a first, elongate optical element, which is provided with a flat Covering section closes off the reflector, with side sections of the first optical element which are spaced apart from one another in the transverse direction and running in the longitudinal direction, to which the reflector is attached, adjoin a second, elongated and flat optical element which, on the reflector side, is attached to the covering section of the first optical element is arranged, as well as a respective head element arranged on the longitudinal end side of the reflector and fastened to it.

Such optical systems are used for a variety of different lights, such as pendant lights or ceiling lights. For example, OLEDs or LEDs can be used as illuminants in the optical system or in the respective lamp. By using optical systems with several optical elements next to the reflector, the light emitted by the lamp arrangement can be optimized, for example homogenized and subsequently or simultaneously directed to set predetermined, possibly complex, light distribution curves while maintaining predetermined and exact anti-glare properties of the optical system or the luminaire equipped with this optical system.

On the other hand, disadvantages are associated with the use of such a multi-part optical system, which can be caused by manufacturing tolerances of the components used and/or operational dimensional changes, for example by thermal expansion. This can cause gaps within the optical system, for example, so that light can be emitted at undesired sections of the optical system, which can result in the desired appearance of the luminaire and associated deviations from the luminaire's target light distribution curve. Conventional multi-part optical systems can therefore have complex geometries and in particular overlaps of optical components of the optical system in order to avoid such effects. However, these design measures are often very expensive to implement.

In this respect, the present invention is based on the object of developing a conventional optical system in such a way that normal manufacturing tolerances and, in particular, operational thermal expansion of the components of the optical system are tolerable, such that the optical properties of the optical system, in particular a predetermined light distribution curve or function essentially all operating situations can be maintained.

The above object is achieved by the present invention with an optical system having the features of claim 1. The optical system according to the invention for an elongated lamp comprises an elongated reflector, open in the light emission direction, with a support section on which an illuminant arrangement, in particular a plurality of OLEDs or LEDs , is arranged, as well as reflector side sections that are spaced apart from one another in the transverse direction and run in the longitudinal direction by the support section, a first, elongated optical element, which closes the reflector with a flat covering section or closes an opening of the reflector, with the covering section being spaced apart from one another in the transverse direction and adjoin side sections of the optical first element running in the longitudinal direction, to which the reflector is attached, in particular in such a way that the reflector is arranged on the inside of the covering device in the transverse direction, a second, Elongated and flat optical element, which is arranged on the reflector side, i.e. on the inside of the reflector, on the cover section of the first optical element and which can be set up for guiding the light of the illuminant running in the direction of the cover section of the first optical element, as well as one longitudinal end side to the reflector arranged and in particular the reflector frontally closing and attached to the reflector head element. The optical system according to the invention is characterized in that the second optical element is supported or arranged in a floating manner, i.e. movable, on the first optical element in the longitudinal direction, and that at least one of the head elements or the respective head element has an inner side section on an associated end face of the second optical element with respect to its longitudinal extension and that at least one of the head elements or the respective head element is arranged and designed so that the assigned end face of the second optical element rests without a gap on the assigned inner side section in the event of an operational change in length of the second optical element in the longitudinal direction to maintain tracking of the inside portion.

The optical system according to the invention is based on the fundamental idea of compensating for production-related and/or operational dimensional changes of components within the multi-part optical system in that at least one of the two head elements is designed and arranged to automatically track a contact surface, here a contact surface, to the second optical element and in this way to avoid that viewing gaps can open up within the optical system due to manufacturing or operational reasons, which cause an undesirable appearance of the lamp or the optical system and/or an undesirable light distribution curve.

This inventive basic idea of the optical system according to the invention can be used particularly advantageously in an embodiment in which such a head element is arranged and fastened on both longitudinal end sides of the elongated reflector on the reflector and on the first optical element and both head elements with a respective inner side section on an associated end face of the second optical element and are designed and arranged, in the event of an operational change in length of the second optical element in the longitudinal direction, to maintain gap-free contact of the assigned end face of the second optical element on the assigned inner side section of the respective head element by tracking the side section. A change in length in the second optical element can be compensated for by the two head elements arranged at the longitudinal ends of the reflector in the manner of an automatic centering of the second optical element within the optical system according to the invention.

The first optical element can be designed, for example, as an optical cover for the optical system and thus, depending on the embodiment, as a cover for the associated elongated lamp. Depending on the embodiment, the second elongated and flat optical element, which is arranged, in particular rests on, the cover section of the first optical element, can be set up to guide the light of the illuminant running in the direction of the cover section of the first optical element. Depending on the embodiment, the cover section can have structured or unstructured, in particular planar, surfaces for guiding the light.

The specification of a direction as longitudinal or transverse direction can mean a direction that runs in the installed position of the components of the optical system according to the invention in the longitudinal direction of the reflector or in the transverse direction of the reflector.

Further features according to the invention and developments of the invention are given in the following general description, the figures, the description of the figures and the dependent claims.

It can expediently be provided that the tracking of the head element or the respective head elements is effected by elastic restoring forces, in particular elastic restoring forces in the head element. In this respect, it can be provided that the respective head element is designed to be elastic and the tracking of the head element or the inner side section is effected by generating or releasing elastic restoring forces in the head element. An operational expansion of the second optical element can lead to an elastic deflection of the head element or elements, which results in an elastic reaction force in the head element and which causes the head element or elements to avoid a reduction in the longitudinal extent of the second optical element corresponding column between the head element and the second optical element is tracked or be. In other words, depending on the operating situation, in this embodiment the second optical element can press an assigned end face against an assigned inner side section of the head element, thereby increasing elastic restoring forces in the head element. In contrast, the inner side section of the head element will follow an operational shrinkage of the second optical element, for example due to cooling, due to a release of elastic restoring forces, so that both an increase and a decrease in the extension of the second optical element in the longitudinal direction, a mutual contact of a End face of the second optical element is maintained on an associated inner side portion of a respective head element.

In order in particular to compensate for manufacturing tolerances of the components of the optical system according to the invention, it can expediently be provided that in the installed position in all operating situations the inner side section of the respective head element bears against the associated end face of the second optical element in the longitudinal direction with a force applied, i.e. a press fit between the head elements attached to the reflector and the second optical element is provided. The statement "all operating situations" can cover the entire operation or non-operation of an optical system according to the invention or a lamp assigned to it, ie starting from a situation with the lamp switched off at an ambient temperature that lies in a predetermined range up to a Operating situation with the lamp switched on and operated at nominal power, at an ambient temperature within a specified temperature range. As already shown, such an application of force when the second optical element rests on the associated inner side section of the respective head element can be generated by an elastic reaction force in the head element, but according to the present invention also by an elastic reaction force in the reflector.

In order to provide a simple implementation of the tracking of the head element to the second optical element or to track the associated inner side section of the head element to the associated end face of the second optical element, it can expediently be provided that in the area of a contact section for connecting or contacting the first optical element and at least one of the head elements or both head elements, the covering section of the first optical element extends in the longitudinal direction beyond the at least one head element or the head elements and that the respective head element rests with a front edge against the covering section of the first optical element under a force. These structural designs ensure that the head element can be in contact with the first optical element even when the head element is deflected in the longitudinal direction by the second optical element in a direction perpendicular to the longitudinal direction and perpendicular to the transverse direction, in order to maintain the specified optical properties of the optical system to be maintained over all operating states. Provision can preferably be made to provide the application of force to the head element in the described direction perpendicular to the longitudinal direction and perpendicular to the transverse direction in that the respective head element is oversized and supported between the reflector and the second optical element. In particular, the respective head element and the reflector can be arranged in relation to one another in such a way that an elastic reaction force can be generated on the head element approximately perpendicularly to the first optical element.

In order to provide the described tracking of the head element or the inner side section of the head element to the associated end face of the second optical element, it can be provided that at least one, in particular both of the head elements, have a form-fit connection in a direction perpendicular to the longitudinal extension and perpendicular to the transverse extension (of the type described Contact of an end face of the head element to the reflector-side surface (main surface) of the first optical element) to the first optical element and in the longitudinal direction has a frictional connection to the first optical element, so that contact of the respective head element with the first optical element is provided in every operating situation can. The frictional connection between the first optical element and the head element can enable the head element to be displaced in the longitudinal direction relative to the first optical element, while it can be ensured, in particular by applying a force from the reflector to the respective head part in a direction perpendicular to the longitudinal axis and perpendicular to the transverse direction, that the respective head element rests with an associated end face on the first optical element.

It should be noted that embodiments can also be designed in which one of the head elements, in particular both head elements, in a direction perpendicular to the longitudinal extent and perpendicular to the transverse extent, do not have an end face of the respective head element in contact with the reflector-side surface (main surface) of the first optical element, but rather a slight one Game. Associated with this, in these embodiments, an elastic deflection of the head element in the area of the first optical element, caused by a change in length of the second optical element, can be caused particularly easily, since no frictional connection between the head element and the first optical element has to be overcome and there is therefore no risk that the second optical element forms a wavy surface when stretched in length due to the clamping between the head elements. However, such play should preferably be comparatively small, since otherwise undesirable visual impressions can arise when looking at a luminaire equipped with an optical system according to the invention.

For simplified generation of the elastic restoring forces in the at least one or the respective head element, it can expediently be provided that this is designed to be easily elastically deformable in the longitudinal direction in the area of a tracking section, in particular in the area of said inner side section, in that its dimension in the longitudinal extension corresponds to the thickness of the head member reduced in length as compared to the length thereof adjacent the support portion of the reflector to facilitate longitudinal elastic deformation of the member.

According to the invention, different configurations can be implemented to connect the respective head element to the reflector. As a particularly useful measure, the provision of a plurality of in a direction perpendicular to the Longitudinally and perpendicularly to the transverse direction spaced snap-in connections exposed, via which the respective head element can be attached to the reflector. These latching connections can be designed to act in the longitudinal direction, ie provide a form fit to prevent the respective head element from moving apart from the reflector in the longitudinal direction. These latching connections can preferably each have two latching elements associated with one another, for example a latching hook with a respective spring region and a latching projection arranged on the free end of the spring region as the first latching element, and a latching recess assigned to the latching projection of the latching hook and in particular designed to complement the latching projection, as the second latching element, preferably the latching hook with associated latching projection can be arranged on the head element and the latching recesses associated with the latching projections can be arranged on the reflector.

When designing the snap-in connections between the reflector and the respective head element, it can expediently be provided that the snap-in hooks are arranged alternately on the head element, e.g. in such a way that with two snap-in hooks arranged adjacent to one another, one of the snap-in hooks has the associated snap-in recess on the reflector on an outer surface and the other of the two Latching hook engages behind the associated latching recess on the reflector on an inner surface of the reflector. In this embodiment, the respective spring areas of the latching hooks can rest either on the outer surface or on the inner surface of the reflector, so that the latching hooks can provide the functionality of holding the contour of the generally U-shaped reflector in addition to fastening the head element to the reflector, for example around the reflector to save material comparatively thin. The contour holder of the reflector provided by the described arrangement of the head element to the reflector can also be used, for example, to use comparatively elongated reflectors and thus very elongated optical systems according to the invention, since the head elements maintain the specified contour of the reflector even with length dimensions of more than 1 m, for example be able. In principle, it can be provided that the latching hooks also provide contact surface sections in the region of the respective latching projections in order to enlarge the respective contact surface on the reflector, which rest on associated contact surfaces of the reflector in the installed position. These associated contact surfaces of the reflector can, for example, be such surfaces on the reflector that delimit the associated latching recess of the respective latching projection.

The described alternating arrangement of the latching hooks on the respective end face of the reflector, in which the reflector is alternately encompassed on its outside and its inside by the latching hook or its respective spring area, can also be arranged and designed to press the head element against the first optical element . For this purpose, the head element can be arranged between the reflector and the first optical element in a direction perpendicular to the longitudinal direction and perpendicular to the transverse direction in the manner of a press fit, with an elastic deflection of the reflector in this direction being able to provide the contact pressure as an elastic reaction force.

It can expediently be provided that at least some of the snap-in connections between the head element and reflector have different play between the snap-in hook or snap-in projection and the associated snap-in recess in the longitudinal direction, in particular depending on the distance between the snap-in connection and the supporting section of the reflector. In general, the statement "play in the longitudinal direction" in relation to the snap-in connections between the head element and reflector means an arrangement in which the respective snap-in recess and the respective snap-in projection are designed in such a way that, after locking, this snap-in connection allows a (virtual) displacement of the head element and reflector in Longitudinally over a distance limited by the amount of play is possible, as far as only this locking connection is considered. In order to provide the described tracking of a respective head element to the second optical element, it can expediently be provided that at least one latching connection with a greater distance to the supporting section of the reflector than one or more latching connections which are arranged closer to the supporting section of the reflector has a larger longitudinal play in the longitudinal direction . This allows the respective head element to be longitudinally displaceable in the area of contact with the second optical element, possibly with an increase or decrease in an elastic reaction force within the respective head element, ie with elastic deformation or with the release or partial release of an elastic deformation of the head element. In one embodiment, it can be provided, for example, that a first plurality of latching connections, which are arranged closer to the carrying section of the reflector, than a second plurality of latching connections, which are at a greater distance from the carrying section of the reflector, have a longitudinal play in the range of approximately zero, while the latching connections of the second plurality have such a play that allows an elastic deflection of the head element in this section facing the first optical element. For example, before be seen that the snap-in connections, starting from said inner side section of the head element, have a longitudinal play over the first third or half of an extension perpendicular to the longitudinal direction and perpendicular to the transverse direction, while the snap-in connections further away from the first optical element have a longitudinal play have in the region of zero.

It can also be provided that the snap-in connections equipped with longitudinal play are dispensed with entirely, so that the positive-locking fastening of the head element on the reflector in the longitudinal direction is achieved solely by the snap-in connections close to the carrying section of the reflector (i.e. by the, starting from the carrying section of the reflector, via the first two Third or half of an extension arranged perpendicular to the longitudinal direction and perpendicular to the transverse direction locking connections) is provided. It can also be provided, as described, that no latching connections are provided in this section, but rather contact lugs, in order to maintain a predetermined contour of the reflector in the area adjacent to the first or second optical element. The arrangement and design of these contact lugs can be identical to the latching hook described, with the exception that no latching projection is included. On the other hand, the latching connections between the head element and the reflector in the contact area with the first optical element have the advantage that they maintain the contour of the reflector, particularly during assembly work.

In order to guide the head element in the installed position relative to the first optical element in the longitudinal direction, it can expediently be provided that the head element has two lateral spring sections on its section facing the first optical element in the installed position, which are designed and configured to engage with a respective associated longitudinal groove on the first optical element. It can be provided that one of the groove walls of this longitudinal groove is provided by a lateral area of the cover section of the first optical element. With this design, the specified tongue-and-groove connection provides for a forced displacement of the head element in the longitudinal direction or an elastic deflection of the head element in the longitudinal direction in the region of the head element facing the covering section of the first optical element. Said longitudinal groove and a spring section of the head element accommodated by it can be designed in such a way that there is sufficient play between them to enable the desired elastic deflection of the head element in the longitudinal direction.

In principle, it can be provided that the respective head element is adapted to the cross section of the reflector. In particular, the reflector can have a trapezoidal cross section and the associated head element or elements can be adapted to it in a corresponding trapezoidal manner.

According to a large number of embodiments of the optical system according to the invention, the reflector can have a generally U-shaped cross section, it being possible for the reflector to have an opening. The shape of the reflector may include curved and/or straight sections in cross-section. For example, the cross-section of the reflector can be approximately semi-circular, approximately semi-elliptical or angular. With regard to an angular design, the generally U-shaped reflector can also be designed with a V-shape in cross section. In this respect, it should be noted that the statement “generally U-shaped reflector” is to be interpreted very broadly, in particular that the different shapes of the various embodiments of the reflector mentioned are to be subsumed under it.

In a particularly expedient embodiment, it can be provided that the elongated reflector has latching elements, in particular latching recesses, on the face side in the region of its side sections, which are connected to complementary latching elements, in particular latching hooks of the respective head element that extend in the longitudinal direction and can be deflected perpendicularly thereto, in order to provide a plurality of latching connections between Reflector and respective head element interact. In particular, in the case of a reflector with a trapezoidal cross section and an associated trapezoidal head element, it can be provided that the respective latching connections on the side sections of the reflector with the associated head element have different play in the longitudinal direction, so that a deformation of the respective head element, in particular in the form of a bending in Longitudinally, is provided with a change in length of the second optical element for optimized tracking of the respective head element to the associated end face or end face of the second optical element.

Depending on the embodiment, the reflector can be attached to the first optical element in different ways. For example, the two elongate components of the optical system according to the invention can be aligned with one another and fastened to one another by means of a large number of fastening elements spaced apart in the longitudinal direction, for example latching elements. In a particularly useful version ment shape, it can be provided that the respective side sections of the first optical element have a groove running in the longitudinal direction on the inside for receiving a respective, assigned spring section arranged on one of the two side sections of the reflector, so that the connection of the two components via two running in the longitudinal direction and in Transversely spaced tongue and groove connections can be realized.

It can expediently be provided that the reflector is designed as a sheet metal element coated with a reflective layer, it being possible for it to have a tongue section on the respective free ends of the side sections for accommodation in the associated groove on the associated side section of the first optical element. The depth of the groove, i.e. the extent to which the reflector extends into the associated groove of the first optical element, can be made so large that changes in the length of the reflector and/or the first optical element in the tongue and groove caused by production and/or operation can be avoided -The connection between the reflector and the first optical element does not lead to the associated spring section of the reflector disengaging from the associated groove on the first optical element.

In order to provide a particularly effective fixation of the reflector of the optical system designed according to the invention on the first optical element, it can be provided that the above-described tongue and groove connection is fixed by means for preventing a relative displacement of the reflector and the first optical element to one another in the longitudinal axis . For example, it can be provided that in the area of the tongue section of the reflector, cutouts and deformations of the cutout area are formed out of the surface plane to form claws, in which the cutout sections described, in particular spaced apart in the longitudinal direction, are located in assigned groove wall sections of the groove of the first optical element claw.

It can preferably be provided that the groove on the respective side section of the first optical element for receiving an associated tongue section of the reflector is provided by two flanges of the first optical element running inwards and in the longitudinal direction, which extend from an associated wall of the respective side section in the transverse direction extend inside.

To fasten the second optical element to the first optical element, in particular floating, i.e. movable in the longitudinal direction, it can expediently be provided that the second optical element is overlapped at its longitudinal edges by an associated retaining flange running in the transverse direction of a respective side section of the first optical element . The respective retaining flange can preferably also provide one of the groove walls for providing the groove for receiving the respective tongue section of the reflector. In this embodiment, the second optical element can be longitudinally aligned with the optical element and then inserted longitudinally therein.

Depending on the embodiment with regard to the optical functionality of the optical system, the second optical element can be designed differently. In principle, it can be provided that this second elongated and planar optical element is arranged and designed in such a way that it is designed to guide the light of the illuminant running in the direction of the covering section of the first optical element. In this respect, the second optical element can, for example, have a light guiding functionality through refraction properties, for example through the design of a microprism-structured surface of an optical disk. Additionally or instead, the second optical element can have such a light guiding functionality by light reflection. According to the invention, this second optical element can also have diffuser properties, in particular for homogenizing the light emitted by the illuminant.

In a particularly expedient embodiment, it can also be provided that the second optical element is designed as an optical element with an optically effective sandwich structure, e.g. comprising at least one diffuser film or diffuser plate and an optical plate provided with a surface that is at least partially microprism-structured. Provision can preferably be made to provide the microprism structuring in the area of two transverse end sections which are spaced apart in the transverse direction and extend in the longitudinal direction, in particular to implement a predetermined anti-glare characteristic of the second optical element or the optical system according to the invention. Provision can be made for a central section extending in the longitudinal direction between the two microprism-structured surface sections to be unstructured, so that in this area the second optical element acts or is formed solely as an optical plate, in particular as a plane-parallel plate.

To realize an attractive design of the optical system according to the invention it can be provided that the side sections of the first optical element extend at an angle of between 60° and 120°, in particular at an angle of approximately 90°, to the covering section of the first optical element.

In order to achieve a special appearance of the optical system according to the invention, it can be provided that the first optical element is designed as a coextrusion part in which the cover section is made of a transparent material such as PMMA or PC and the side sections are made of a diffuser material. Provision can be made for the diffuser material to comprise a mixture of a transparent material, in particular the material of the cover section, with the addition of polymer balls which differ from the transparent material with regard to the refractive index. In this way, in the area of the side sections of the first optical element, a diffuser functionality can be provided for the light emitted by the illuminant without increased absorption of the light taking place in this section, since the diffuser properties of the material are not based on the absorption of light.

To avoid looking into the interior of the optical system according to the invention in certain operating situations of the system installed in a lamp, it can expediently be provided that the head elements are coated on the outside with a diffuser material and/or are made of a diffuser material. For example, the head element can in turn be made of PMMA or PC, into which polymer beads can be mixed with a different refractive index than the actual material.

To further improve light control within the optical system according to the invention, a further optical element can be provided, in particular an optical element designed as primary optics, which can be arranged directly or close to the illuminant (for example LEDs or OLEDs) of the illuminant arrangement. Such a third optical element can be provided, for example, to provide a collimator functionality for parallelizing the light emitted by the respective illuminant, which thus falls in a predetermined manner on the second and the first optical element and is deflected by them with particular accuracy to provide a predetermined light distribution function can.

In another embodiment, it can also be provided that the third optical element is set up and arranged to provide homogenization of the light emitted by the lamp arrangement in the transverse direction, for example in such a way that the second and the first optical element are homogeneous over their entire transverse and longitudinal extent be illuminated so that the optical elements can generate the desired light distribution curve.

For this purpose, the supporting portion of the reflector can comprise holding elements extending in the direction of the second optical element for holding such a third, elongate optical element. In another embodiment it can also be provided that this third optical element is differentiated in the longitudinal direction, i.e. in this embodiment several third optical elements arranged next to one another in the longitudinal direction can be provided.

In order to fasten the system according to the invention to a mounting body of a light, it can expediently be provided that the side sections of the first optical element have respective holding areas for engaging with associated holding areas of a mounting body of a light. These holding areas can represent, for example, a vertical undercut for a side section of an associated mounting body, so that the engaged side sections of the first optical element and an associated mounting body are designed to hold the optical system on the mounting body.

The invention also relates to a lamp, comprising an elongate, in particular open on a main side, which is designed to accommodate an optical system according to one of the above-described embodiments, wherein the mounting body has a fastening section for fastening the lamp to a component and two from this approximately has vertically extending side sections, the side sections each having a holding area for engaging with associated holding areas of the side sections of the first optical element of the optical system according to the invention for holding the optical system in the mounting body. Such a light can be designed, for example, as a ceiling light or pendant light. The shape of the mounting body can be adapted to the respective lighting problem. In a particularly expedient embodiment, the mounting body can be cuboid with the described fastening section and the two side sections which extend perpendicularly thereto and which can serve as fastening sections for the optical system according to the invention described above.

In particular, when a cuboid mounting body and a trapezoidal reflector are provided, a cavity of the luminaire can be realized between the reflector and the inner boundary surfaces of the mounting body, in which in particular electronic supply components, control components and/or sensors for operating the light source of the optical system can be arranged.

• 1 eine perspektivische Stirnseitenansicht auf eine Leuchte, umfassend ein erfindungsgemäß gestaltetes optische System unter Entfernen von Stirnteilen der Leuchte,
• 2 eine perspektivische Stirnseitenansicht auf ein erstes und ein zweites optisches Element zur Gestaltung eines erfindungsgemäßen optischen Systems der Leuchte der 1,
• 3 eine perspektivische Stirnseitenansicht auf einen Reflektor zur Gestaltung eines erfindungsgemäßen optischen Systems der Leuchte der 1,
• 4 ein Kopfelement zum Verbinden mit dem Reflektor der 3 zur Gestaltung eines erfindungsgemäßen optischen Systems,
• 5 das erfindungsgemäße optische System zur Gestaltung der Leuchte der 1 in einem Längsschnitt und
• 6 einen Längsschnitt durch die Leuchte der 1 mit einer Ansicht auf einen Kopfbereich der Leuchte

zeigt.The invention is explained below by describing an embodiment and modifications with reference to the accompanying drawings, wherein

• 1 a perspective end view of a lamp, comprising an optical system designed according to the invention with the removal of end parts of the lamp,
• 2 a perspective end view of a first and a second optical element for designing an optical system according to the invention of the lamp 1 ,
• 3 a perspective end view of a reflector for designing an optical system according to the invention of the lamp 1 ,
• 4 a header for connecting to the reflector of 3 for the design of an optical system according to the invention,
• 5 the optical system according to the invention for the design of the lamp 1 in a longitudinal section and
• 6 a longitudinal section through the lamp 1 with a view of a head area of the lamp

indicates.

The optical system according to the invention described below is designed for use in an elongated pendant lamp 1, see 1 , which shows this pendant lamp in detail in a perspective end view of a head section with end parts removed to show the basic structure. The essential components of the optical system can be a reflector 2 with a trapezoidal cross section, which can have a reflective coating on the inside and can include a support section that is flat here, to which a light source arrangement, for example in the form of a circuit board 9 with a row arrangement of LEDs, can be attached on the inside. Starting from the support section, the reflector 2 can have two reflector side sections which are spaced apart by this in the transverse direction and run in the longitudinal direction, which are connected at their free end to a first optical element designed here as a lamp cover 4 .

The lamp cover 4 can have a central cover section 40 in the transverse direction, which closes off the reflector 2 and two side sections which are spaced apart from one another in the transverse direction and run in the longitudinal direction, which are designed on the one hand for attachment to the reflector and on the other hand for attachment of the optical system to a mounting body 15 can be trained.

The cover section 40 of the lamp cover 4 can be flat, in particular in the manner of a plane-parallel plate. In the described embodiment, the optical system according to the invention can have an optical sandwich structure 6 as the second optical element, which can be arranged floating on the inside, i.e. on the reflector side, on the cover section of the lamp cover or placed on it. Further details of the optical system according to the invention are explained with reference to the following figures.

2 shows in an individual representation the optical sandwich structure 6 carried by the lamp cover 4 in a perspective view looking at one end face. The lamp cover 4 is composed of the middle section 40 in the transverse direction Y and the side sections 41a, b that adjoin it at a distance from one another in the transverse direction and run in the longitudinal direction. The lamp cover 4 can be designed as a co-extruded part, with the central region being able to be designed in the form of the covering section 40 from a transparent material such as PC or PMMA, while the adjoining side sections 41a, b can have a diffuser material. For example, these side sections can have a transparent material such as PMMA or PC, into which polymer parts are mixed that have a different refractive index to this base material, so that the light introduced into the side sections 41a, b, in contrast to the light transmission in the transparent cover section 40, is strongly scattered . The two side sections 41a, b have grooved flanges extending inward in the transverse direction, here the Y direction, in the form of a lower grooved flange 42a, b and an upper grooved flange 43a, b, which extend in a direction perpendicular to the longitudinal direction and perpendicular to the transverse direction, respectively Groove 44a, b can form for receiving a respectively associated spring section of the reflector 2, see 1 .

The side portions 41a, b of the lamp cover 4 may be two in the vertical direction (Z-direction, ie, a direction perpendicular to the transverse direction direction and perpendicular to the longitudinal direction of the optical system) have mutually adjoining vertical sections 45a, 46a or 45b, 46b, which merge into one another and are offset from one another in the transverse direction, so that they form an undercut for engaging with a respective complementarily designed side section of the mounting body 15, whereupon will be addressed below.

As shown, the cover section 40 of the lamp cover 4 can be designed as a plane-parallel section of an optical plate, on which an optical sandwich structure 6 can rest, which can be composed of an optical plate 60 and a diffuser film 63 lying on the inside. The optical plate 60 of the optical sandwich structure 6 can have a microprism structure 61 on at least one surface in two lateral sections spaced apart from one another by a central section in the transverse direction, in particular to provide a predetermined anti-glare characteristic of the optical system or the lamp equipped therewith.

3 shows a perspective view of an end region of a reflector of an optical system according to the invention for the configuration of in 1 specified lamp. The reflector is elongated in the longitudinal direction X and can have a trapezoidal cross section, formed by a support section 20, which can be designed to support the lamp arrangement on the inside, see FIG 1 , It being possible for two side sections 22a, b to adjoin the supporting section 20 in the transverse direction. The support section 20 as well as the two adjoining side sections 22a, b can be designed essentially flat, with an angle in the range of approximately 135° being able to be set between the respective side section and support section. A respective spring section 23a, b can be connected to the respective free end of the side sections 22a, b, which can run, for example, parallel to the support section 20, in particular parallel to the longitudinal direction (X-direction) and parallel to the transverse direction (Y-direction) of the reflector or of the optical system. As with reference to 1 explained, the reflector 2 can be designed and arranged to be brought into engagement with its tongue sections 23a,b in the associated groove 44a,b of the lamp cover 4, see FIG 1 .

In order to ensure a fixed relative position of reflector 2 and lamp cover 4 in all operating situations, sheet metal cutouts spaced apart in the longitudinal direction can be provided in the area of spring sections 23a, b of reflector 2, which are pivoted out of the respective plane of the spring section to provide respective claws 25, see 3 . When the tongue sections 23a, b engage in the respective associated groove 44a, b for fastening the reflector to the lamp cover 4, the claws 25 dig into a groove wall of the respective groove 44a, b, so that a longitudinal displacement of the reflector 2 relative to the lamp cover 4 is prevented .

In the described embodiment of the optical system according to the invention, the reflector 2 can be terminated at the end with a respective head element in a manner to be described below, the connection of reflector and head element being realized via a plurality of snap-in connections spaced apart from one another in relation to the side sections 22a, b. For this purpose, the side sections 22a, b can have a plurality of latching recesses 26a, b to 30a, b, which can interact with associated latching hooks on a head element in the manner described below. Furthermore, the reflector 2 can have a pressure flange 21 on the front side of the support section 20, which can be designed and arranged to exert a pressure force in the vertical direction (Z direction), i.e. approximately perpendicular to the longitudinal direction (X direction) and transverse direction (Y direction) of the To effect reflector on the head element. In addition, the end sections of the side sections 22a, b can have projections 31a, b and 32a, b which, in the installed position, similarly bear against associated contact surfaces of the head element and apply a force component in the Z direction to the head element. In principle, in both cases the application of force to the head element can be generated by a slight elastic bending of the reflector.

4 shows a perspective view of a head element 7 that can be arranged on the longitudinal side of the reflector 2 and that can be connected to the reflector in the installed position via a plurality of connecting elements on complementary, ie assigned, connecting elements of the reflector. The head element 7 can have a plate-like shape and be adapted to the cross section of the reflector 2 by a basically trapezoidal shape here. The head element 7 can have snap-in hooks assigned to the snap-in recesses 26a, b to 30a, b of the reflector, wherein a plurality of snap-in hooks 73a, b, 74a, b and 75a, b can be designed to overlap the reflector on the outside, while the snap-in hooks 80a , b and 81a, b the reflector at the in 3 end face shown can overlap inside, so that the latching of the specified latching hooks in the associated latching recesses of the reflector has a form fit in the longitudinal direction and a form fit in a direction perpendicular to the longitudinal direction and perpendicular to the transverse direction between the head element and the reflector.

Each of the snap-in connection can have two mutually associated snap-in elements, ie in the described embodiment a snap-in hook 73a, b, 74a, b and 75a, b as well as 80a, b and 81a, b arranged on the head element, which for snapping in with a respective associated snap-in recesses 26a, b to 30a, b are formed on the reflector. Each of these latching hooks comprises a base section with which the respective latching hook is formed on the head element, an adjoining spring area 82b and a latching projection 83b arranged at the free end of spring area 82b, which is designed for latching with an associated latching recess on the reflector. For clarity of illustration, the individual sections of the snap-in hooks are shown in 4 given only for the latching hook 81b. The spring section 82b can be used, on the one hand, to deflect the latching hook during the latching process and, on the other hand, to provide a contact surface for contact with an associated surface section on the reflector, which will be discussed further below.

As indicated in the embodiment described, the latching hooks on the head element 7 can extend parallel to the longitudinal direction and accordingly approximately perpendicular to the planar structure of the head element 7 . Out of 4 also shows the contact surface 70 on which the contact flange 21 of the reflector 2 comes to rest in the installed position.

As from a comparison of 3 and 4 As can be seen, the latching recesses 23a, to 30a, b on one end face of the reflector 2 have a different longitudinal extent, while the latching hooks can be of identical design with regard to their longitudinal extent, so that the latching connections at least partially have different play in the longitudinal direction (X direction ) can have, which will be discussed in more detail below. The head element 7 can have a further front edge 71 opposite the front edge 70 designed as a contact surface to the reflector, which in the installed position comes into contact with the lamp cover 4 or its cover section in a manner to be described. Furthermore, the head element 7 can have an inner side section 72 running approximately perpendicularly to the front edge 71 in this area of the head element 7, which comes into contact with an assigned front edge of the optical sandwich structure 6 in a manner yet to be explained in the installation position of the components.

After the explanations regarding the design of individual components of the optical system according to the invention, reference is made below to FIG 5 and 6 explains a particular functionality of this system according to the invention. 5 shows in a longitudinal section the assembled optical system designed according to the invention in a perspective partial view looking at one longitudinal end of the system. Not visible in the figure, the tongue section 23b of the reflector 2 is inserted into the associated groove 44b of the lamp cover 4, the head element being aligned with the longitudinal end of the reflector 2 and the latching elements 73a, b to 75a, b and 80a, b and 81a, b are engaged in the associated recesses 26a, b to 30a, b of the reflector 2. In the installed position, the pressure flange 21 of the reflector 2 is in contact with the associated contact surface 70 of the head element 7, so that the head part is pressed with its opposite front edge 71 onto the inner surface 47 of the lamp cover 4 within its cover section 40. In this respect, in a direction perpendicular to the longitudinal extent of the optical system and perpendicular to the transverse extent, a contact, in particular a force-loaded contact, can be provided between the head element 7 and the lamp cover 4 in the form of a prestressed surface contact of the front edge 71 of the respective head part 7 and the reflector-side or inner surface (Main surface) 47 of the cover portion of the lamp cover 4.

In addition, the head element 7 can, on its side facing the cover section 40 of the light cover 4 , rest with an inner side section 72 on an associated end face 64 of the second optical element, which is embodied here as an optical sandwich structure 6 . Such a system can be essential for the appearance of the optical system according to the invention or a lamp designed with this system and can be maintained over all possible operating situations by the design according to the invention. Otherwise an observer could look through the cover section 40 and the undesired gap into the interior of the optical system and thus, for example, onto the light source arrangement, which can disturb a harmonious overall impression of the optical system or a luminaire equipped with it. Therefore, in the optical system according to the invention, provision can be made to provide a frictional connection in the longitudinal direction between the head element and the covering section 40 of the lamp cover 4, which enables the head element to move outwards, in particular when the longitudinal extension of the optical sandwich structure 6 is increased, while maintaining a gap-free contact of the inner side section 72 on the end face 64 of the optical sandwich structure and while maintaining a gap-free contact of the end edge 71 of the head element and the inner surface 47 within the covering section 40 of the lamp cover 4. To provide such a displaceability of the section of the head element 7 facing the covering section 40 in the longitudinal direction, the head element can be configured and arranged so as to be elastically deflectable in this area.

In an embodiment that is not shown, it is also possible for one, in particular both, of the head elements 7 in a direction perpendicular to the longitudinal extension and perpendicular to the transverse extension not to have an end face 71 of the respective head element 7 rest against the reflector-side surface (main surface) 47 of the first optical element 4 to provide, but a minor game. An elastic deflection of the head element in the area of the first optical element 4, caused by a change in length of the second optical element 6, can thus be brought about particularly easily, since no frictional connection between the head element 7 and the first optical element 4 has to be overcome.

Like in particular 5 As can be seen, for this purpose it can be provided that the lamp cover 4 and thus also its cover section 40 extends in the longitudinal direction over the longitudinal extent of the optical sandwich structure 6 and the head element, such that in all operating situations the front edge 71 of the head element 7 is on the inner surface 47 of the cover portion 40 of the lamp cover 4 is present. To facilitate the elastic deflection of the head part in the area of its side facing the cover section 40 of the lamp cover 4, the thickness, ie the longitudinal extension, of the head part in this area can be reduced relative to the thickness of the section facing the support section of the reflector 2.

In order to compensate for possible manufacturing tolerances of the components even at low temperatures, which under certain circumstances can result in shrinkage of the optical sandwich structure 6 in the longitudinal direction, it can be provided that the optical sandwich structure 6 between the two head elements 7, which the optical system frontally complete, is used with an excess, so that even in such cases, by dissolving elastic reaction states in the respective head element, the desired gap-free states between the head element and the optical sandwich structure and between the head element and the covering section 40 can be reliably maintained. At the same time, an automatic centering of the second optical system (optical sandwich structure) to the first optical element (luminaire cover) can be provided.

In order to guide the head element in the installed position relative to the first optical element or the lamp cover 4 in the longitudinal direction, it can be provided that the head element 7 has two lateral spring sections 76 (see 4 ) arranged and adapted to engage a respective associated longitudinal groove 49 on the lamp cover (see 2 ). How out 5 As can be seen, it can be provided in the described embodiment that one of the groove walls of this longitudinal groove 49 is provided by a lateral area of the cover section of the lamp cover. The other groove wall of this longitudinal groove 49 can be provided by the lower groove flange 42, b of the groove for receiving the reflector spring sections 23a, b. The design described provides guidance for the displaceability of the head element 7 in the longitudinal direction X or guidance for the elastic deflection of the head element in the longitudinal direction X in the area facing the covering section of the first optical element.

Regarding 4 it was explained above that the locking hooks, which extend approximately vertically in the longitudinal direction, can be designed and arranged to rest alternately on the inside and the outside of the reflector. For example, in the representation of 5 the latching hook 81b with its spring section 82b on the inside of the reflector and is latched with the associated latching recess 29b, while the latching hook 75b rests with its spring section on the outside of the reflector 2 and is brought into engagement with the associated latching recess 30b of the reflector. As can also be seen from the figure, the projections 31b, 32b of the reflector 2, which can be seen here, lie against an associated side edge of the head element 7 in the installed position.

In order to provide an elastic deflection of the head element 7 in the longitudinal direction, it can expediently be provided that the snap-in connections, which are arranged adjacent to or in the vicinity of the end edge of the head element that rests on the cover section 40 of the lamp cover 4, have greater play in the longitudinal direction than Snap-in connections that are located further away from this end face, ie closer to the support section of the reflector. This situation goes out in particular 6 out which of the representation of 5 corresponds, but with a viewing direction perpendicular to the longitudinal section plane, with the further difference to 5 the 6 represents a section through the entire lamp, in which the optical system of 5 is used. The bottom section 40 of the lamp cover 4 can be seen closest snap-in connection, comprising the snap-in element 73b of the head element 7 and the snap-in recess 26b of the reflector 2, has a predetermined longitudinal play S1, which enables the head element 7 to be elastically deflected outwards in the longitudinal direction in this area if the optical sandwich structure 6 is due to thermal expansion, for example presses with its end face 64 against the inner side section 72 of the head element 7 . An elastic deflection can be compensated in the same way in the optical system according to the invention when the optical sandwich structure shrinks in the longitudinal direction, for example by cooling down when the lamp is dimmed, in which case elastic reaction forces are released in the head element and thus automatically the inner side section 52 of the head element while maintaining a gap-free system on the end face 64 of the optical sandwich structure is tracked.

In the representation of 6 the second latching hook 74b on the outside of the reflector, which is arranged in the associated latching recess 28b, has a play S2 in the longitudinal direction of approximately zero, so that in this area of the connection there can be a connection between the reflector and the head element that is essentially rigid in the longitudinal direction. In contrast, the latching connection closest to the reflector support section can in turn have a small amount of play S3 in the longitudinal direction, in particular a play of approximately zero, so that the head element can be fastened without play in the longitudinal direction in a section close to the reflector support section, while the head element can be attached in a reflector support section remote from the cover section Near section can be attached with a longitudinal play, so that the head element is arranged elastically deflectable in the longitudinal direction in this area. In one embodiment it can also be provided that the latching connections between the head element and the reflector are not provided in the section close to the covering section. In another embodiment, instead of snap-in hooks, longitudinally extending contact flanges can be provided on the head element, which abut the reflector in the same way as the spring sections of the snap-in hooks and contribute to maintaining its contours.

The representation of 6 shows a longitudinal section through a pendant lamp which has an optical system designed according to the invention. The luminaire can have an approximately cuboid mounting body 15 which is open on a main side in the light emission direction and is designed to accommodate an optical system designed according to the invention. In this case, the mounting body 50 can have a respective end face termination 16 on the front side, it being possible for the luminaire to be terminated on the front side with a respective luminaire head part 90 . Depending on the operating situation, a longitudinal gap can be formed on the face side between the longitudinal end of the lamp cover 4 and the lamp head part 90, the width of which in the longitudinal direction can depend on the operation. To avoid looking into the interior of the optical system through the head element, the head element can be made of a diffuser material or covered with a diffuser layer.

To describe the connection between the mounting body 15 and the optical system, reference is again made to the representation of FIG 1 . The mounting body 15 can have a fastening section 17, on which the lamp is fastened to a building, in particular as a pendant lamp. Two side sections 18a, b can extend from this fastening section 17, which is flat here, at an angle of approximately 90°, with the side sections each forming an internal vertical section 19b at their free ends, which can be brought into engagement with the above-described undercut on the side sections 41a , b of the lamp cover 4. This undercut provided in the vertical direction (Z-direction) is formed by the two vertical sections 45a, 46a and 45b, 46b of the respective side section 41a, b of the lamp cover 4, which are offset in the transverse direction. In the embodiment described, the engagement of the optical system or the lamp cover with the mounting body can be carried out by longitudinally aligning and longitudinally moving both components towards one another.

The optical sandwich structure 6 can be inserted into the lamp cover in the same way by aligning it with the lamp cover and sliding it relative to one another in the longitudinal direction. In contrast, the reflector 2 can first be inserted by aligning the reflector to the lamp cover 4 in the longitudinal direction and then by inserting the respective spring section 23a, b of the reflector 2 in the transverse direction into the associated groove 44a, b of the lamp cover 4, with the claws 25 in the Hook into the groove walls to prevent the reflector and luminaire cover from shifting in the longitudinal direction.

How out 1 Indirectly visible, to homogenize the light emitted by the LEDs on the LED circuit board 9, primary optics can be provided as a further optical element, which can extend over the entire longitudinal extension of the reflector 2, in particular for receiving and predetermined guidance of the light in the transverse direction. 1 . shows spaced apart in the transverse direction and arranged at the edge to the circuit board Retaining hook 10 for holding the described, optional but not shown primary optics.

Reference List

1

lamp

2

reflector

4

Luminaire cover / first optical element

6

Optical sandwich structure / second optical element

7

header element

9

LED circuit board

10

Bracket for primary optics

15

assembly body

16

face section

17

attachment section

18a, b

side section

19a, b

vertical section

20

carrying section

21

pressure flange

22a, b

side section

23a, b

spring section

24

clearance

25

claw, claw element

26a, b

27a, b

28a, b

29a, b

30a, b

recess

31a, b

head Start

32a, b

head Start

40

cover section

41a, b

side section

42a, b

Lower grooved flange, retaining flange

43a, b

Upper groove flange

44a, b

groove

45a, b

vertical section

46a, b

vertical section

47

Inner surface

48

outer surface

49

longitudinal groove

60

optical disc

61

microprismatic structure

63

diffuser sheet

64

face

70

contact surface

71

front edge

72

inside section

73a, b

74a, b

75a, b

External snap hook

76

spring section

80a, b

81a, b

Inside snap hook

90

lamp head part

X

longitudinal direction

Y

transverse direction

Z

height direction

i.e

longitudinal oversize

s1, s2, s3

backlash

Claims (19)

Optical system for an elongate lamp (1), comprising - an elongate reflector (2), comprising a support section (20) on which an illuminant arrangement is arranged and through the support section spaced apart from one another in the transverse direction (Y) and running in the longitudinal direction (X). Reflector side sections (22a, b), - a first, elongated optical element (4) which closes the reflector (2) with a flat cover section (40), side sections which are spaced apart from one another in the transverse direction and run in the longitudinal direction on the cover section (40). (41a, b) of the first optical element (4) to which the reflector (2) is attached, - a second, elongated and flat optical element (6) which is attached to the covering section (40) of the first optical element ( 4) is arranged, - in each case a head element (7) arranged on the longitudinal end side of the reflector (2) and fastened to it, characterized in that the second optical element (6) is supported on the first optical element (4), and that the respective head element (7) rests with an inner side section (72) on an assigned end face (64) of the second optical element (6) and is designed and arranged is, at an operational length change of the second optical element (6) in the longitudinal direction (X) to maintain a gap-free contact of its inner side section (72) on the associated end face (64) of the second optical element (6) by tracking the inner side section (72). Optical system after claim 1 , characterized in that the respective head element (7) is elastic and the tracking of the inner side section (72) is effected by generating or releasing elastic restoring forces in the head element (7). Optical system after claim 1 or 2 , characterized in that the inner side section (72) of the respective head element (7) bears against the associated end face (64) of the second optical element (6) in the longitudinal direction with the application of force. Optical system after claim 1 , 2 or 3 , characterized in that in the area of a contact section of the first optical element (4) to at least one of the head elements (7), the covering section (40) of the first optical element (4) extends in the longitudinal direction (X) over the at least one head element (7) extends beyond and the head element (7) with a front edge (71) subjected to a force on the cover portion (40) of the first optical element (4) abuts. Optical system according to one of Claims 1 until 4 , characterized in that at least one of the head elements (7) in a direction (Z) perpendicular to the longitudinal direction (X) and perpendicular to the transverse direction (Y) a system, in particular a force-loaded system and in the longitudinal direction (X) a frictional connection to the first optical element ( 4) has. Optical system according to one of Claims 1 until 5 , characterized in that at least one of the head elements (7) is fastened to the reflector (2) by means of a plurality of latching connections spaced apart in a direction (Z) perpendicular to the longitudinal direction (X) and perpendicular to the transverse direction (Y). Optical system according to one of Claims 1 - 6 , characterized in that the reflector (2) is trapezoidal in cross section and the respective head element (7) adapted to it is formed trapezoidal. Optical system according to one of Claims 6 , or 7, characterized in that the reflector (2) has latching elements, in particular latching recesses (26a, b - 30a, b) in the region of its side sections (22a, b) which, with associated latching elements, in particular extend in the longitudinal direction (X). Latching hooks (73a, b; 74a, b; 75a, b; 80a, b; 81a, b) of the respective head element (7) cooperate to provide a plurality of latching connections between the reflector (2) and the respective head element (7). Optical system according to one of Claims 1 until 8th , characterized in that the respective side sections (41a, b) of the first optical element (4) have a groove (44a, b) running in the longitudinal direction on the inside for receiving a respective, assigned, on one of the two side sections (22a, b) of the Reflector (2) arranged spring section (23a, b). Optical system according to one of Claims 1 until 9 , characterized in that the side sections (22a, b) of the reflector (2) have claw elements (25) spaced apart in the longitudinal direction (X), which hook onto assigned points of the side sections (41a, b) of the first optical element (4). Optical system according to one of Claims 1 until 10 , characterized in that the second optical element (6) is overlapped at its longitudinal edges by a retaining flange (42a, b) running in the transverse direction of a respective side section (41a, b) of the first optical element (4). Optical system according to one of Claims 1 until 11 , characterized in that the second optical element (6) is designed as a light guide element and has a sandwich structure comprising at least one diffuser film (63) and an optical plate (60) provided with an at least partially microprismatic structured surface. Optical system according to one of Claims 1 until 12 , characterized in that the side sections (41a, b) of the first optical element (4) extend at an angle of between 60 degrees and 120 degrees, in particular approximately 90 degrees, to the cover section (40). Optical system according to one of Claims 1 until 13 , characterized in that the first optical element (4) is a co-extrusion in which the cover portion (40) is made of a transparent material and the side portions (41a, b) are made of a diffuser material. Optical system according to one of Claims 1 until 14 , characterized in that the at least one head element (7) is coated on the outside with a diffusion material and/or is made from a diffuser material. Optical system according to one of Claims 1 until 15 , characterized in that the support section (20) of the reflector (2) comprises holding elements (10) for holding a third, elongated optical element for homogenizing the light emitted by the illuminant. Optical system according to one of Claims 1 until 16 , characterized in that the side portions (41a, b) of the first optical element (4) have holding areas for engaging with associated holding areas of a mounting body (15) of a lamp (1). Luminaire (1), comprising an elongate mounting body (15) which is designed to accommodate an optical system according to one of Claims 1 until 17 , comprising a fastening section (17) for fastening the lamp (1) to a component, and two side sections (18a, b) extending approximately perpendicularly therefrom, the side sections each having a holding area for engaging with associated holding areas of the side sections of the first optical Element (4) of the optical system for holding the optical system in the mounting body (15). Shine after Claim 17 , electronic supply components, control components and/or sensors for operating the illuminant of the optical system being arranged between the inner walls of the mounting body (15) and the outer walls of the reflector (2).

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