Patent ID: 12228270

The accompanying drawings are provided to clarify the embodiments of the invention. They illustrate the embodiments and, together with the description, serve to explain the principles and concepts of the invention. Other embodiments and many of the mentioned advantages will become apparent when consulting the drawings. The elements of the drawings are not necessarily shown at the same scale.

In the figures, elements, features and components which are identical and which have the same function and effect each have the same reference symbols, unless otherwise stated.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

A lighting device1′ according to a first exemplary embodiment is illustrated inFIGS.1-3. The device1′ is a built-in “downlight” variant. The lighting device1′ can be installed, for example, in a false ceiling in an internal space of a building, which is not shown here in its entirety, to illuminate the space.FIG.1shows a plate element25′ of such a false ceiling, which in this example mainly extends horizontally.

The lighting device1′ has a lamp housing2′ and a lighting unit3′. The lamp housing2′ has an internal space12′, in which the lighting unit3′ is positioned. The lighting unit3′ is designed as a component which is independent from the lamp housing2′ and can be moved relative to the lamp housing2′.

FIG.1shows that the lamp housing2′ in this exemplary embodiment is made up of a plurality of parts, with a front housing section seen from visible side S inFIG.1designed with a circular, plate-shaped cover element26′ and latched to a rear housing section. For this purpose, the plate-like cover element26′ continues away from the visible side S in a cylindrical section. A visible front side of the cover element26′ can preferably be painted over, for example in the desired colour of the ceiling. An outer circumference of the lamp housing2′ can be of essentially circular design.

A section of the rear housing section on the rear side11′ of the lamp housing2′ is designed as a curved, dome-shaped rear wall13′ made of steel as a ferromagnetic material.

An internal surface15a′ of the rear wall13′ on the internal side thereof is formed as part of a spherical surface. A curvature of the internal surface15a′ is therefore the same at every point on the rear wall13′ and is consequently constant. An outer surface of the rear wall13′ on the external side14′ thereof is also formed as part of a spherical surface, with the result that the wall thickness of the rear wall13′ is essentially uniform. The rear wall13′ of the device1′ can be produced expediently, but a spherical segment-shaped outer surface of the rear wall13′ is not absolutely necessary in the exemplary embodiment inFIGS.1-3.

The internal space12′ of the lamp housing2′ shown inFIG.1is therefore delimited by a flat front wall26′, the essentially spherical cap-shaped rear wall13′ and an essentially cylindrical section between the front wall26′ and the rear wall13′.

When the lighting device1′ is mounted as shown inFIGS.1-3, the lamp housing2′ ends essentially flush with a surface27′ of the plate element25′ surrounding the lamp housing2′.FIG.2in particular shows the restrained, aesthetic and unobtrusive installation, in which the lighting unit3′ is barely visible to a viewer in the illuminated space.

InFIG.1, a central axis A2′ of the lamp housing2′ essentially runs along a vertical direction V and through a centre point of the cover element26′, wherein the cover element26′ forming the front housing wall and the rear wall13′ are essentially rotationally symmetrical in relation to the axis A2′.

The lamp housing2′ is equipped on its circumference with several ball plungers31′, each of which has a ball32′ which is spring-loaded in the radial direction. In the first exemplary embodiment, four ball plungers31′ are arranged on the periphery of the lamp housing2′ at intervals of 90 degrees around the housing central axis A2′, thus, enabling the lamp housing2′ to be supported uniformly.

With the help of the ball plunger31′, the lamp housing2′ is mounted in a recess29′ in the plate element25′, for example an intermediate ceiling, in a simple and easily detachable manner. For this purpose, the balls32′ of the ball plunger31′ latch onto a suitable groove or behind a suitable offset in the recess29′.

A frame-like assembly set35′ can also be provided for the flush fastening of the lamp housing2′ in the recess29′, which can provide, for example, an offset or an edge to click the balls32′ into place.

The lighting unit3′, which can be moved in the internal space12′, has a heat sink18′ featuring a printed circuit board (“PCB”)20a′ with an LED device20b′ for light generation. The lighting unit3′ also has a lens21′ positioned in front of the LED device20b′ in the direction of the light emission which is surrounded on the front, light-emitting side device by a funnel-like cover and beam-limiting element22′ with a central tube extension22a′. The heat sink18′, the circuit board20a′ with the LED device20b′, the lens21′ and the cover and beam-limiting element22′ are arranged concentrically along a central axis A3′ of the lighting unit3′ in this order towards the light output side17′ of the lighting unit, wherein the axis A3′ also coincides with a central axis of the tube extension22a′, which is equipped with a circular internal cross section.

This has a light emission area7′ on the light output side5′ of the lamp housing2′. During operation, the lighting unit3′ emits light on the light output side17′ of the lighting unit3′ through the tube extension22a′, wherein the light emitted in this way is directed outwards through the light emission area7′, i.e. into the room to be illuminated. For this purpose, the cover element26′ has a central, preferably circular, light emission opening8′, which enables the light emitted by the lighting unit3′ to leave the unit.FIGS.1-3show that the aperture8′ is accessible from the visible side S when the lighting device1′ is in the assembled state.

The lens21′ is designed in such a way that the light generated by the LED device20b′ passes through the relatively narrow inner channel of the tube extension22a′ and the relatively small light emission opening8′ to the outside on visible side S as a cone of light K with a relatively large cone opening angle, for example from between about 20 degrees and about 40 degrees. This contributes to the fact that the light source is not or barely visible to the viewer. In this case the lens21′ is designed, for example, in such a way that the lens21′ focuses the light entering it from the LED device20b′ at a downstream location, thereby allowing a narrow exit opening8′ to be used despite large distances. This avoids non-aesthetic visible points of light.

A diameter D8′ of the light emission opening8′ is relatively small compared to the surface area of the cover element26′ and in some examples can be in a range from about 11 mm to about 15 mm, with D8′ being about 12 mm or 13.5 mm or between and including 12 mm and 13.5 mm.

The curved, dome-shaped rear wall13′ of the lamp housing2′ is positioned on the rear side11′ of the lamp housing2′ facing away from the light output side5′. In the lighting device1′, the lighting unit3′ is magnetically attached to the dome-like curved wall13′ of the installation housing2′ on the inside, wherein the exit beam angle or main beam direction A of the lighting unit3′, for example along the central axis of the cone of light K, in relation to the lamp housing2′, and thus the beam angle in the sense of an inclination of the main beam direction A relative to the axis A2′ in a plane that contains the axis A2′, as well as the beam angle in the sense of a rotation of the main beam direction A about the axis A2′ in the circumferential direction, can be adjusted by moving the lighting unit3′ along the dome-like rear wall13′.

In order to attach the lighting unit3′ to a selectable location on the rear wall13′ using a magnetic force and to thereby enable the adjustment of the beam direction A, the rear side19′ of the lighting unit13′ facing away from the light output side17′ of the lighting unit13′ has a permanent magnet23′ attached to the heat sink18′, for example by means of a screw connection, which can interact with and adhere magnetically to the ferromagnetic rear wall13′. The magnet23′ is, for example, ring-shaped and is generally positioned concentrically to the heat sink18′, the circuit board20a′, the lens21′ and the element22′ on the rear side of the heat sink18′.

To adjust the beam direction A, the rear side19′ of the lighting unit3′ is moved and displaced along the curved rear wall13′ with the aid of an adjustment tool97′, which has an elongated tubular design. One end of the tool97′ may be snugly inserted into the interior channel of the tube extension22a′ to make adjustments. The tube extension22a′ therefore serves not only as a light outlet, but also as a coupling device37′ on the light output side17′ for the temporary engagement of the tool97′ during the adjustment process. In this way, the elongated tool97′ is inserted on the visible side S into the aperture8′ to enable the continuous adjustment of the beam direction A, and therefore the beam angle. In the exemplary embodiment shown inFIGS.1-3, the beam direction A can be adjusted by +/− 30 degrees by tilting the axis A3′ relative to axis A2′, wherein it is possible to rotate the axis A3′ around the axis A2′ by 360 degrees. Tilting by +/− 30 degrees is thus possible in all radial planes through axis A2′. These possible movements are indicated schematically inFIG.3and denoted by reference symbol B. After the adjustment process, the tool97′ is removed from the tube extension22a′.

Due to the spherical curvature and therefore the constant curvature of the rear wall13′ in all directions, shifting the rear side19′ of the lighting unit3′ by a certain distance always leads to a constant, equal change in the beam angle in relation to the axis A2′.

The bar tool97′ is hollow on the inside and therefore has a continuous opening98′ in the longitudinal direction like a tube. During the adjustment, light99′ (seeFIG.3) which is emitted by the lighting unit3′ can exit through the aperture98′. A point of light is thrown into the room, which makes the current beam direction A clear to the operator making the adjustment and helps them to adjust the direction. The light beam angle can therefore be clearly determined by the operator in a simple way during adjustment.

Alternatively, the tool97′ could be designed in the form of a rod without a longitudinal continuous opening if the emission of light99′ during adjustment is not desired.

A lighting device1according to a variant of the first exemplary embodiment is illustrated inFIGS.4-8. The explanations provided above forFIGS.1-3also apply toFIGS.4-8, with the differences described below. InFIGS.4-8, elements and features which have already been described in relation toFIGS.1-3are denoted by the same reference symbols, but in each case without inverted commas.

The lighting device1inFIGS.4-8in particular differs from the device1′ in that in the lighting device1, the lamp housing2has access openings61in an area between the light output side5and the curved, dome-shaped rear wall13. Due to the access openings61penetrating a side wall of the lamp housing2, the lamp housing2is largely laterally open in this area. In addition, the overall height of the lamp housing2in relation to its diameter is selected to be greater than that of the lamp housing2′.

A control device80(“driver”) for powering the lighting unit3is located outside of the lamp housing2. In the case of the lighting device1, a wire65, in particular a flexible cable, which is only shown in a schematically simplified way inFIG.7, is routed through the access opening61into the internal space12for the electrical supply of the lighting unit. In this way, the wire65connects the lighting unit3to the control device80, which is positioned outside of the lamp housing2and is also only shown in a schematically simplified way inFIG.7.

In the two variants ofFIGS.1-8, the lighting unit3′,3is designed in such a way that the lighting unit3′,3extends in a longitudinal section along the axis A3′ or A3from the light output side17′,17to the rear side19′,19, initially expanding in the radial direction and then tapered again. The maximum radial dimension of the lighting unit3′,3is closer to the light output side17′,17than the rear side19′,19. This design enables collision-free tiltability within the angular range described above of, for example, +/− 30 degrees in relation to the axis A2′, A2while at the same time providing sufficient space for a heat sink18,18′, which enables effective heat dissipation. The heat sink18,18′ is formed with a corner E in the longitudinal section in the area of the maximum radial dimension of the heat sink.

In the case of the lighting device1inFIGS.4-8, the lighting unit3is largely located inside of the internal space12of the lamp housing2, whereas the tube extension22aof the lighting unit3, which is in other cases positioned in the same way as the exemplary embodiment inFIGS.1-3, protrudes slightly from the light emission opening8, seeFIG.4-8. In contrast, the device1′ ofFIGS.1-3, features a lighting unit3′ located fully within the internal space12′, wherein part of the tube extension does not project through the aperture8′, either with straight orientation of the lighting unit along the axis A2′ or in an inclined position.

In the case of variant ofFIG.4-8, the beam direction A is adjusted in the same way as inFIG.1-3using a tubular tool97, the inner passage98of which in turn allows light99to exit the end of the tool97during adjustment and makes it easier for the operator to make the adjustment, seeFIGS.7and8. In turn, the axis A3of the lighting unit3can, as shown in the example inFIGS.1-3, be inclined by an angle β of up to approximately 30 degrees relative to the axis A2of the lamp housing2in all radial planes in which the axis A2lies. In turn, the axis A2inFIG.5runs parallel to the vertical V, for example.

The lamp housings2′,2in the variants described above are intended for installation in a recess29′,29and in the cavity located behind the plate element25′,25, wherein installation, for example in a ceiling, wall or floor could be considered. The plate element25′,25can therefore be used as a wall or ceiling or floor component. Alternatively, it is also conceivable to mount the lamp housing2′,2in an outer housing, which is not shown in the figures.

19and20show a lighting device1″ according to a further variant of the first exemplary embodiment. InFIGS.19and20, elements and features which have already been described forFIGS.1-8are denoted by the same reference symbols, but in each case with double inverted commas. The differences between this variant and those ofFIGS.1-8are described below, with reference to the above explanations.

The lighting device1″ has a lamp housing2″ which is attached to a mounting position in a different way than the housing2,2′. No separately provided assembly set is used in the variant inFIGS.19,20. Instead, the lamp housing2″ has fastening devices40″ which enable the lamp housing2″ to be fastened within a recess29″ in a plate element25″. The fastening devices40″ each feature a tab element41″ and a plurality of mutually offset channels42″, into which an end section of the tab element41″ can be selectively inserted. The channels42″ allow adaptation to different thicknesses of the plate element25″. In other words, the assembly set is integrated into the lamp housing2″.

The lamp housing2″ inFIGS.19-20has an initial rear-side housing section50″ and a second, front-side housing section55″, both of which are connected using fasteners53″, for example screws. The channels42″ are arranged circumferentially on the front housing section55″.

The rear-side housing section50″ is made of steel, for example, and has a curved, dome-shaped rear wall13″ with an external side14″ and an internal side15″ in the same way as the rear wall13,13′, which is attached to a peripheral, cylindrical wall section52″ connects. The front housing section55″ has an encircling, cylindrical wall section56″ and a plate-like wall section57″ which essentially extends perpendicularly to the wall section56″, delimits an internal space12″ in sections at the front and runs around one edge of the wall section56″. The channels42″ are in the wall section56″. On the outside, the wall section57″ features radial ribs58″ which, when the wall section57″ is filled, cemented or plastered in, are covered with filler, cement or plaster and facilitate adhesion.

The front housing section55″ has a central, in particular circular, aperture59″ which allows access to the internal space12″. After mounting the lamp housing2″ in the recess29″, a lighting unit3″ can, for example, be easily introduced into the internal space12″ through the aperture59″, seeFIG.19. A magnet23″ on a rear side19″ of the lighting unit3″ enables the lighting unit3″ to be attached and adjusted inside on the curved rear wall13″.

The lamp housing2″ also has a cover element26″, which is designed as a flat and circular disc formed with a metal material, for example steel, inFIGS.19and20. The cover element26″ can be fitted into the aperture59″ and has a central, in particular circular, access opening which serves as a light emission opening8″. In order to fasten the cover element26″ to the second housing section55″, several holding magnets60″, for example three, are arranged adjacent to an edge of the aperture59″ and distributed along its circumference. After the lighting unit3″ has been introduced, the cover element26″ can be magnetically fastened using the magnets60″ and the housing section55″ can then be closed on the visible side, except for the aperture8″.

A light emission area7″ is formed with the light emission opening8″ on a light output side5″ of the housing2″. The rear wall13″ is on a rear side11″ of the housing2″, facing away from the light output side5″. The lighting unit3″ can shine light onto a light output side17″ in order to emit the beam through the light emission area7″, wherein the rear side19″ also faces away from the light output side17″ inFIGS.19and20.

In the longitudinal section of the lighting unit3″, the heat sink18″ of the lighting unit3″ has an area which forms an axial middle area M of the lighting unit3″ between the light output side17″ and the rear side19″ and in which the maximum radial dimension of the heat sink18″ and thus also of the lighting unit3″ is essentially constant and decreases on both sides of this area along the axis A3″ of the lighting unit3″, which in turn makes possible a good, collision-free tiltability of +/− 30 degrees, for example, in relation to the axis A2″.

As inFIGS.1-8, the lens21″ designed as described above for the lenses21,21′ is surrounded on its light-emitting side by a funnel-like cover and beam-limiting element22″, whereinFIG.20shows that the element22is fitted with locking devices22b″ and is attached to this using a catch as part of the lighting unit3″. A tool97,97′ is also used for adjustment in the variant inFIGS.19-20, as described above.

Analogously to the example inFIGS.4-8, the lamp housing2″ has at least one access opening61″ which allows a supply line for the lighting unit3″ to be passed through. The access opening(s)61″ is/are formed inFIGS.19-20as cutouts in the wall section52″ starting from its edge coupled to the second housing section55″.

The devices1′,1,1″ are ideally designed for use inside a building. For outdoor applications, lighting devices101,101′ according to a second exemplary embodiment and a variant thereof are described below with reference toFIGS.9-18. The lighting devices101,101′ are each designed as a light which is protected against the ingress of water and dust, wherein the protection can correspond, for example, to an IP protection class suitable for the type of use. In the case of the lighting devices101,101′, instead of an accessible opening—which inFIGS.1-8and19-20allows adjustment by means of a mechanical intervention of a tool—there is a counter-magnet on the external side of a rear wall of a partially dome-shaped, curved housing102,102′—which in this case is not formed from a ferromagnetic material but, for example, from an aluminium material or a plastic material.

9-16show the lighting device101according to the second exemplary embodiment, which has a lamp housing102and a lighting unit103arranged completely within an interior space112of the lamp housing102when ready for operation. The internal space112is closed off from the outside and sealed against the ingress of water and/or dust from the outside. In this way, the lighting unit103can be effectively protected against the ingress of moisture and/or dirt when used outdoors.

The lamp housing102is formed with a light emission area107on a light output side105thereof. Furthermore, the lamp housing102has a curved, dome-shaped or cupola-like rear wall113on a rear side111that faces away from the light output side105.

In the second exemplary embodiment, unlike the first embodiment, the housing102is illustrated in an example position in which the rear wall113faces downward. This illustration is chosen with a view to the exemplary application in the area of a floor, which will be explained in more detail below, but the housing102can instead be oriented differently in other applications.

In the light emission area107, the lamp housing102has a translucent cover141, which is, for example, a translucent or transparent pane, such as a glass pane, and by means of which the lamp housing102is tightly closed on the light output side105. The cover141is sealed against other housing components with a seal143, which is made of silicone, for example.

The lighting unit103, which can be moved in the internal space112, has a heat sink118, wherein a printed circuit board120afeaturing an LED device120, a lens121and a cover element122are substantially arranged concentrically to each other and the heat sink118along a central longitudinal axis A103of the lighting unit103.

During operation, the lighting unit103emits light on a light output side117of the same, which is generated by the LED device120band directed and/or focused in the desired manner by the lens121arranged in the output direction A in front of the LED device120b. The cover element122has a central, circular access opening, see FIG. The cover element122also has a conical surface section that extends in a ring shape around the access opening.

FIG.9shows that the lighting unit103is arranged in the internal space112in such a way that it can let the light emitted on its light output side117shine through the light emission area107of the lamp housing102and thereby through the cover141. The light emission area107of the housing102in the second exemplary embodiment is larger than the light emission opening8,8′,8″ in the first exemplary embodiment and its variants and essentially occupies the entire diameter of the lamp housing102on its light output side105. While the lens21,21′,21″ in the first exemplary embodiment is ideally adapted for diffusion through small or narrow apertures, this is not required in the same way for the lens121. The lens121is therefore of a different type than the lenses21,21′,21″ in preferred exemplary embodiments.

Furthermore, a rear side119of the lighting unit103, which is opposite the light output side117and thus faces away, features a permanent magnet123, which is ring-shaped, for example, with the central longitudinal axis A103of the lighting unit103coinciding with a central axis of the magnet123. The magnet123can be screwed to the heat sink118, for example. Using the magnet123, the lighting unit103is attached to a selectable location on the rear wall113of the lamp housing102, wherein a selected alignment of the axis A103of the lighting unit103and thus a selected main beam direction A is fixed and is adjustable.

The adjustment of the beam direction A and the fastening of the lighting unit103is accomplished in the second exemplary exemplary embodiment using a tool197provided for this purpose. The tool197also has a permanent magnet, which can interact with the magnet123by attracting one another using, for example, a counter-magnet147in the shape of a ring or disk. By arranging and moving the tool197and thus the counter-magnet147on the external side114of the rear wall113, the orientation of the axis A103is adjusted by moving the rear side119along the rear wall113without needing to access the internal space112. The attraction between the magnets123,147pulls the rear side119of the lighting unit103against an internal side115of the rear wall113, as a result of which the selected orientation of the lighting unit103is also fixed. This allows the lighting unit103can be effectively protected against the effects of external moisture and dirt by sealing the housing interior112. Direct mechanical access is avoided.

The lighting device101of the second exemplary embodiment is also designed as a built-in light, wherein the lamp housing102is designed to be accommodated and installed in a cavity or a recess129in an outer housing189. This in turn has four ball plungers131to mount the lamp housing102, which are arranged uniformly around the circumference of the housing102and are each spaced at 90 degrees to each other, each featuring a spring-loaded ball32which enables the detachable lamp housing102to be snapped into the outer housing189; cf. the example the sectional views inFIGS.9-11andFIG.14.

The outer housing189can in particular be accommodated in the floor area. In this case, a central housing axis A102can run along a vertical direction V, seeFIG.9, in which case the lighting device101can shine upwards in different directions from the perspective of the viewer. An alternative installation in the area of a wall or ceiling outdoors is also conceivable.

In the installed state, see for exampleFIG.10, the lamp housing102closes with its outer surface on the light output side105essentially flush with a surface127in the vicinity of the installed light housing102. The surface127can be, for example, a floor surface, wherein a cavity to receive the outer housing189can be created in the floor. However, surface127could be a wall or ceiling surface for wall or ceiling mounting, for example.

Another ball plunger153is also arranged concentrically in relation to the axis A103in the centre on the rear side119of the lighting unit103and is surrounded by the ring-shaped magnet123. The ball plunger153helps with the adjustment. A spring-loaded ball159of the ball plunger153acts on an internal side115of the curved, dome-shaped rear wall113. An internal surface on the internal side115of the rear wall113is formed as part of a spherical surface. An outer surface on the external side114is also curved in the shape of a dome and is designed as part of a spherical surface. However, while the rear wall113is essentially smooth on the external side114and enables the tool197to be moved smoothly on the external side114, the internal side115of the rear wall113has a plurality of concentric grooves171in which the balls159can engage by locking in a detachable manner.

In this way, the tilt angle of the axis A103of the lighting unit103, and thus the main beam direction A, can be adjusted in predefined stages in relation to the housing axis A102through the interaction of the ball plunger153and the grooves171in the rear wall113, which is made of a non-ferromagnetic material, in particular a plastic or aluminium or an aluminium alloy, and through the attraction of the two magnets123and147to each other. At the same time, the axis A103, and thus the main beam direction A, can be continuously rotated about the vertically oriented housing axis A102, wherein the ball159runs in the groove171in which it is currently engaged. The grooves171may be spaced such that the tilt angle of the axis A103is adjustable in increments of, for example, 5 degrees.

However, the grooves171can be omitted in variants of the second exemplary embodiment, which then allows the tilt angle of the axis A103to the axis A102to be adjusted in an infinitely variable manner. In such a variant, the ball plunger153can be retained in order, for example, to enable the rear side119of the lighting unit103to be moved more easily along the rear wall113.

The lighting unit103initially widens radially in a longitudinal section of the same from the light output side117to the rear side119and then narrows again. As in the first exemplary embodiment inFIGS.1-3and its variant inFIGS.4-8, in the lighting unit103an area of a maximum radial dimension of the lighting unit103is formed closer to the light output side117than to the rear side119, see for example11It is therefore possible to accommodate a heat sink118, which can effectively dissipate the heat generated by the LED device120band at the same time achieve adjustability within the desired angular range. In the second exemplary embodiment, the lighting unit103also has a corner E in the area of the maximum radial dimension.

In the case of the lighting device101, a wire, which is not shown in the figures, for the electrical supply of the lighting unit103is fed out through a sealed channel167from the internal space112of the lamp housing102. The sealed channel167is located on the rear side111of the lamp housing102, penetrates the rear wall113and is sealed separately, for example using a screw connection. In the second exemplary embodiment, a control device or “driver” (not shown in the drawing) can be located outside of the lamp housing102and is connected to the lighting unit103using the wire in the manner described above.

On the rear side111of the housing102, a small area occupied by the channel167, seeFIG.13, is therefore not accessible to the counter-magnet147and subsequently also the tool197. If the lighting unit103is to be adjusted into a position for which the tool197would need to be placed in the area of the channel167, this can be achieved during assembly by inserting the housing102into the outer housing189in a rotated manner, for example by rotating it approximately 90 or 180 degrees. In this way, all desired beam angles can be achieved in the sealed second exemplary embodiment.

Outer housing189may be formed with an outer, lower portion190and an inner, upper portion191, as diagrammatically illustrated inFIGS.9-16. The lower part190can form a base-like element, which can be placed, for example, in a floor area, for example in a channel in the floor, and can be fastened using a flange192with fastening openings at the lower end of the part190. The lower part190is wider towards the bottom, giving it a stable footing, and is hollow on the inside. In the upper region of the lower part190, the upper part191is accommodated in sections as an insert, see for exampleFIG.14, wherein the upper part191is also hollow inside and accommodates the lamp housing102. The lamp housing102can be latched onto the upper part191using the ball plunger131, wherein the balls32click into a rear edge of the part191.

As is particularly clear in the top view, the lower part190of the outer housing189, see for exampleFIGS.11-13, has a flat side193that facilitates placement of the outer housing189near walls, for example, near an outer wall of a building. This can be useful if the lighting unit103is equipped with lenses that form a narrow cone of light and need to be placed close to the wall to create a lighting effect.

17,18also illustrate a lighting device101′ according to a variant of the second exemplary embodiment, the above explanations relating toFIGS.9-16also being applicable toFIGS.17and18, with the differences described below. InFIGS.17,18, elements and features which have already been described in relation toFIGS.9-16are denoted by the same reference symbols but with an additional inverted comma.

In the case of the lighting device101′, the outer housing189′, as another example, is in particular shaped symmetrically and is designed as one piece, seeFIG.17. The lamp housing102′ is therefore inserted directly into the hollow and tube-like outer housing189′ from above and is fixed in a detachable manner using the ball plunger131′.

In the variant ofFIGS.17,18, a gradual adjustment of the tilt angle β of the central longitudinal axis A103′ of the lighting unit103′ in relation to the axis A102′ of the lamp housing102′ is also provided. As also illustrated in the top view ofFIG.18, a gradual adjustment in 5-degree increments is possible with the aid of concentric grooves171′. Some possible setting angles β6=βmax=30 degrees, β4=20 degrees, β2=10 degrees and β0=0 degrees are shown in FIG. In the example shown inFIG.17, an angle of γ=90 degrees−βmax=60 degrees thus remains between the horizontal and the maximum tilt angle βmax.

FIG.17also illustrates the cone of light K generated by the lighting unit103′ during operation, which is emitted out of the device through the cover141′.

In the second exemplary embodiment and its variants, the beam direction A can be tilted by up to approximately 30 degrees in relation to the axis A102, A102′ of the lamp housing102and can also be rotated about the axis A102, A102′ as described above.

Although the present invention has been fully described above with reference to the preferred exemplary embodiments, it is not limited to these exemplary embodiments and can be modified in a variety of other ways.

Variants with infinitely variable or gradual adjustability are in particular conceivable in embodiments for both outside and internal use. For example, in the case of gradual adjustability of the beam direction from the rear side of the lighting unit, an additional, centrally arranged ball plunger could also be provided in an embodiment for the interior in order to implement the gradual adjustability. The rear wall13′,13,13″ in the first exemplary embodiment can thus have concentric grooves171in a further variant along the same lines as the second exemplary embodiment.

In addition, it should be noted that although the present invention can be favourably used for lights intended for use in a recess, the invention is not limited to recessed lights. Furthermore, although it is favourable to attach the lamp housing so that it can be detached using the ball plunger described above, the lamp housing can also be attached in other, equally useful ways.

REFERENCE LIST

1,1′,1″ Lighting device2,2′,2″ Lamp housing3,3′,3″ Lighting unit5,5′,5″ Light output side7,7′,7″ Light emission area8,8′,8″ Light emission opening11,11′,11″ Rear side (lamp housing)12,12′,12″ Internal space (lamp housing)13,13′,13″ Rear wall (lamp housing)14,14′,14″ External side (rear wall)15,15′,15″ Internal side (rear wall)15a,15a′ Internal surface17,17′,17″ Light output side (lighting unit)18,18′,18″ Heat sink19,19′,19″ Rear side (lighting unit)20a,20a′ Circuit board20b,20b′ LED device21,21′,21″ Lens22,22′,22″ Cover and beam-limiting element22a,22a′ Tube extension22b″ Locking device23,23′,23″ Magnet25,25′,25″ Plate element26,26′,26″ Cover element27,27′ Surface (plate element)29,29′,29″ Recess31,31′ Ball plunger32,32′ Ball35′ Assembly set37,37′,37″ Coupling device40″ Fastening device41″ Tab element42″ Channel50″ First housing section52″ Wall section53″ Fastener55″ Second housing section56″ Wall section57″ Wall section58″ Rib59″ Aperture60″ Holding magnet61,61″ Access opening65Wire80Control device97,97′ Tool98,98′ Continuous opening99,99′ Light101,101′ Lighting device102,102′ Lamp housing103,103′ Lighting unit105,105′ Light output side107,107′ Light emission area111,111′ Rear side (lamp housing)112,112′ Internal space (lamp housing)113,113′ Rear wall (lamp housing)114,114′ External side (rear wall)115,115′ Internal side (rear wall)117,117′ Light output side (lighting unit)118,118′ Heat sink119,119′ rear side (lighting unit)120a,120a′ Circuit board120b,120b′ LED device121,121′ Lens122Cover element123,123′ Magnet127Surface129,129′ Cavity131,131′ Ball plunger141,141′ Cover143,143′ Seal147,147′ Counter-magnet153Ball plunger159,159′ Ball167Sealed channel171,171′ Groove189,189′ Outer housing190Outer section191Inner section192,192′ Flange193Flat side197,197′ ToolA Main beam directionA2, A2′, A2″ Axis (lamp housing)A102, A102′ Axis (lamp housing)A3, A3′, A3″ Axis (lighting unit)A103, A103′ Axis (lighting unit)B MovementD8′ DiameterE CornerK Cone of lightM Middle areaS Visible sideV Verticalβ Light beam angleβ max Maximum tilt angleβ0, β2Angleβ4, β6Angleg Angle