RECESSED LUMINAIRE, ESPECIALLY CEILING LUMINAIRE

Description

[0001] The invention relates to a recessed luminaire and in particular to a recessed ceiling luminaire.

[0002] DE 10 2009 060 897 A1 discloses a recessed ceiling luminaire comprising a housing, a reflector with a light inlet opening and a light outlet opening, a circuit board, a plurality of LEDs, a converging lens, and a diffuser element. The luminaire is arranged flush in a ceiling to illuminate a floor area of ​​a building. The underside of the reflector and the underside of the housing are flush with the underside of the ceiling. The reflector, the circuit board, the LEDs, the converging lens, and the diffuser element are arranged in the housing. The LEDs are arranged on the circuit board. The converging lens is arranged in the light path between the LEDs and the light inlet opening and focuses the light emitted by the LEDs onto the light inlet opening. The reflector has a bowl-shaped cross-section. The light inlet opening is smaller than the light outlet opening.The diffuser element is located near the light entry opening and features a spherically curved surface. The diffuser provides a uniform distribution of light intensity. The underside of the diffuser acts as a separate light source for the reflector. Some light components leave the luminaire from the diffuser without being reflected by the reflector. Other light components are reflected by the inner wall of the reflector. In this recessed ceiling luminaire, the reflector is designed as a darklight reflector. With a darklight reflector, the light beam emitted by the luminaire has two marginal rays. These each form an angle to the underside of the ceiling, which is referred to as the shielding angle. The space between the underside of the ceiling and the respective marginal ray is referred to as the shadow space.No light emanating from the luminaire penetrates the shadow space, neither direct light emitted by the diffuser element and leaving the luminaire without reflection, nor indirect light reflected by the reflector. A user in the shadow space is therefore not dazzled by the incident light.

[0003] Such recessed ceiling luminaires can, for example, be flush-mounted into a suspended ceiling at several predetermined installation locations in shopping centers to illuminate corridors and hallways. At each installation location, a recessed ceiling luminaire with a suitable beam angle is selected and installed depending on the specified spatial dimensions and architectural elements, in particular the ceiling height and the horizontal distance to walls and shop windows. This ensures that, for example, a shop window is not illuminated and unwanted reflections are avoided. For example, it may be advisable to install a recessed ceiling luminaire with a beam angle of approximately 10° if the ceiling is high and / or the distance to a shop window is short, and a recessed ceiling luminaire with a beam angle of approximately 80° if the ceiling is low and / or the distance to a shop window is great.If, for example, a new promotional stand is set up or dismantled in a hallway, the lighting must be adjusted. To do this, any recessed ceiling lights whose beam angle no longer matches the new specifications must be removed and recessed ceiling lights with a more suitable beam angle installed.

[0004] WO 03 / 044870 A1 discloses a luminaire comprising a housing, a light source arranged in the housing, a lens arranged in the housing, and an adjustment means. The adjustment means comprises a screw having a screw head and a screw shaft with an external thread, and a nut with an internal thread that engages in the external thread. The light source has an outer side facing away from the lens, and the lens has an outer side facing away from the light source. The adjustment means connects the light source and the lens to one another in such a way that the distance between the light source and the lens can be changed with the aid of the adjustment means. The lens has a through-hole through which the screw shaft is guided. The nut is fastened to the light source. The light source has a through-hole through which the screw shaft is guided. The housing has a housing base.The screw shaft is threaded through the through hole of the lamp and the nut. The screw can be screwed in and out of the nut.

[0005] CN 206 572 399 U discloses a luminaire for use in event lighting, comprising a light source, a lens, and an adjustment means. The adjustment means comprises a screw having a screw head and a screw shaft with an external thread. The light source has an outer side facing away from the lens, and the lens has an outer side facing away from the light source. The adjustment means adjustably connects the light source and the lens to one another such that the distance between the light source and the lens can be changed with the aid of the adjustment means. The lens has a through-hole through which the screw shaft is guided. The screw head engages the outer side of the lens. The light source has a through-hole through which the screw shaft is guided.

[0006] WO 2014 / 190379 A1 discloses a recessed ceiling luminaire comprising a housing, a luminous means arranged in the housing, a lens arranged in the housing, and an adjusting means for adjusting the distance between the luminous means and the lens. The luminous means has an outer side facing away from the lens, and the lens has an outer side facing away from the luminous means. The adjusting means adjustably connects the luminous means and the lens to one another such that the distance between the luminous means and the lens can be changed with the aid of the adjusting means.

[0007] In this well-known recessed ceiling light, the lens has an external thread, and the housing has an internal thread that engages with the external thread. The adjustment mechanism comprises the external thread of the lamp and the internal thread of the lens. The lamp is attached to the housing.

[0008] KR 2008 0040086 A discloses a recessed ceiling light comprising a housing, a light source arranged in the housing, a lens arranged in the housing, and an adjustment means for adjusting the distance between the light source and the lens. The light source has an outer side facing away from the lens, and the lens has an outer side facing away from the light source. The adjustment means adjustably connects the light source and the lens to one another such that the distance between the light source and the lens can be changed with the aid of the adjustment means. The adjustment means comprises a screw having a screw head and a screw shaft with an external thread, and a nut with an internal thread that engages in the external thread. The lens has a through-hole through which the screw shaft is guided.

[0009] In this well-known recessed ceiling light, the screw head is attached to the lamp and engages the nut on the outside of the lens. The lamp is attached to the housing. The lamp has a through hole in which the screw head is secured.

[0010] CN 103 016 978 A discloses a recessed luminaire comprising a housing with a rear cover, a luminous means arranged in the housing, a lens arranged in the housing, and an adjustment means for adjusting the distance between the luminous means and the lens. The luminous means has an outer side facing away from the lens, and the lens has an outer side facing away from the luminous means. The adjustment means adjustably connects the luminous means and the lens to one another such that the distance between the luminous means and the lens can be changed with the aid of the adjustment means. The adjustment means comprises a screw having a screw head and a screw shaft with an external thread, and a nut with an internal thread that engages in the external thread. The luminous means has a through-hole through which the screw shaft is guided. The screw shaft is fastened to the lens with its free end.

[0011] In this well-known recessed light, the screw head engages the outer side of the back cover, facing away from the lamp and lens, and the nut is attached to the outside of the lamp. The lens is attached to the housing.

[0012] US 7 178 937 B2 discloses a recessed luminaire comprising a housing, a luminous means arranged in the housing, a lens arranged on the housing, and an adjustment means for adjusting the distance between the luminous means and the lens. The luminous means has an outer side facing away from the lens, and the lens has an outer side facing away from the luminous means. The adjustment means adjustably connects the luminous means and the lens to one another such that the distance between the luminous means and the lens can be changed with the aid of the adjustment means. The adjustment means comprises a screw having a screw head and a screw shaft with an external thread, and a nut with an internal thread that engages in the external thread. The lens has a through-hole through which the screw shaft is guided.

[0013] In this well-known recessed light, the screw head engages neither the lamp nor the lens, the screw shaft engages the lamp, and the nut is attached to the lens. The lens is attached to the housing.

[0014] US 2020 / 224857 A1 discloses a recessed ceiling luminaire comprising a housing, a light source arranged in the housing, a lens arranged in the housing, and an adjustment means for adjusting the distance between the light source and the lens. The light source has an outer side facing away from the lens, and the lens has an outer side facing away from the light source. The adjustment means is connected to the lens in such a way that it can move it relative to the light source and change its distance relative to the light source.

[0015] In this well-known recessed ceiling light, the light source is attached to the housing.

[0016] The object of the invention is to create a recessed ceiling luminaire whose beam angle can be easily changed when installed.

[0017] Against this background, the invention proposes the subject matter of the independent claim. Advantageous embodiments of the invention are described in the dependent claims.

[0018] The invention proposes a recessed luminaire, which is in particular a recessed ceiling luminaire, comprising a housing; a light source arranged in the housing; a lens arranged in the housing; and an adjusting means for adjusting the distance between the light source and the lens, comprising a screw having a screw head and a screw shaft with an external thread, and a nut with an internal thread that engages in the external thread; wherein the light source has an outer side facing away from the lens and the lens has an outer side facing away from the light source; the adjusting means adjustably connects the light source and the lens to one another in such a way that the distance between the light source and the lens is or can be changed with the aid of the adjusting means; the lens has a through-hole.through which the screw shaft is guided, the nut engages the outside of the lamp; the lamp has a through-hole through which the screw shaft is guided; the housing has a housing base; the screw shaft is guided through the through-hole of the lamp and the nut; the screw can be screwed in and out of the nut. the screw head is attached to the lens and / or engages the outside of the lens; the housing base has a through-hole; a circular cylindrical sleeve with a cavity is pressed into the housing base; the cavity surrounds the through-hole of the lamp; the nut is glued onto a free edge of the sleeve that points away from the housing base; and the screw shaft is guided through the sleeve into the nut.

[0019] The invention makes it possible to change the beam angle from the outside without tools even when the recessed luminaire is installed.

[0020] The proposed recessed luminaire can be designed in any desired manner as required, for example as a recessed ceiling luminaire which can be installed in a ceiling, in particular flush or recessed, or as a recessed wall luminaire which can be installed in a wall, in particular flush or recessed, or as a recessed floor luminaire which can be installed in a floor, in particular flush or recessed, and / or in such a way that it does not comprise an additional or at least one additional illuminant and / or does not comprise an additional or at least one additional lens and / or does not comprise an additional or at least one additional adjustment means.

[0021] The housing can be designed in any way as required and can, for example, have a substantially circular-cylindrical basic shape.

[0022] Each light source can be designed in any desired manner as required and can, for example, comprise exactly or at least one incandescent lamp and / or exactly or at least one halogen incandescent lamp and / or exactly or at least one light-emitting diode and / or exactly or at least one fluorescent lamp.

[0023] Each lens may be formed in any desired manner, for example convex or plano-convex or biconvex or concave-convex or concave or plano-concave or biconcave or convex-concave, and / or as a Fresnel lens, and / or spherical or aspherical or astigmatic.

[0024] The illuminant and the lens can be arranged in the housing in any desired manner, as required, for example in such a way that the illuminant is attached or fastened to the housing, in particular detachably, and the lens is movably mounted on the housing, or in such a way that the illuminant is movably mounted on the housing and the lens is attached or fastened to the housing, in particular detachably, or in such a way that the lens and the illuminant are movably mounted on the housing.

[0025] According to the invention, the adjusting means comprises a screw having a screw head and a screw shank with an external thread, and a nut having an internal thread that engages the external thread.

[0026] The screw and the nut connect the lamp and the lens in such a way that by turning the screw relative to the nut the distance between the lamp and the lens and thus also the beam angle can be changed or changed, in particular increased or decreased.

[0027] According to the invention, it is provided that the lens has a through-hole through which the screw shaft is passed, the screw head is attached to the lens and / or engages the outside of the lens, and the nut engages the outside of the lamp.

[0028] An operator can grasp and turn the screw head from the outside without tools, even when the recessed luminaire is installed, and thus turn the screw in the nut so that the distance between the lens that is attached to or engages the screw head and the light source that engages the nut, and thus also the beam angle, is changed, in particular increased or decreased.

[0029] Preferably, it is provided that the screw is designed as a knurled screw or wing screw or star grip screw; and / or the nut is designed as a knurled nut or wing nut or star grip nut.

[0030] In an exemplary design of the recessed luminaire, it is provided that the housing has a first and an opposite second end region; the illuminant is arranged at the first end region or the lens is arranged at the second end region.

[0031] The illuminant can be arranged in any desired manner at the first end region, for example, such that the illuminant is attached or fastened to this end region, in particular detachably, or is located at this end region. The lens can be arranged in any desired manner at the second end region, for example, such that the lens is attached or fastened to this end region, in particular detachably, or is located at this end region.

[0032] In an exemplary embodiment of the recessed luminaire, an inner surface of the housing is provided with a scale with at least two markings. This enables a desired, reproducible adjustment of the distance between the lens and the light source and thus also of the beam angle.

[0033] In an exemplary design of the recessed luminaire, it is provided that the adjusting means comprises an actuating means arranged on or on the outside of the lens; the adjusting means adjustably connects the illuminating means and the lens to one another in such a way that the distance between the illuminating means and the lens is or can be changed by means of the actuating means.

[0034] The actuating means can be arranged on or at the outside of the lens in any desired manner, for example in such a way that the actuating means is attached or fastened on or at this outside, in particular detachably, or is located on or at this outside or in an area adjacent to this outside.

[0035] Preferably, the actuating means comprises a handle which is arranged and / or attached and / or fastened on or to the outside of the lens. The actuating means can be designed in any way as required and, for example, can comprise no additional handle or at least one additional handle. Each handle can be designed in any way as required, for example knurled. If the screw head is attached to the lens and / or engages the outside of the lens, the screw head preferably forms the actuating means and / or one of the handles. If the nut engages the outside of the lens, the nut preferably forms the actuating means and / or one of the handles.

[0036] The actuating means can be arranged on the illuminant in any desired manner, for example in such a way that the actuating means is attached or fastened to the illuminant, in particular detachably. The actuating means can be designed in any desired manner, for example in such a way that it comprises no additional actuating section or at least one additional actuating section, and / or in such a way that it extends from the illuminant past the lens, for example through a gap between an edge of the lens and the housing or through a through-hole in the lens, at least to the outer side of the lens, so that the actuating section is located on the outer side of the lens or in the region adjacent to this outer side.

[0037] In an exemplary embodiment of the recessed luminaire, the lens comprises at least one Fresnel lens. This enables a particularly space- and mass-saving lens.

[0038] In an exemplary embodiment of the recessed luminaire, the light source comprises at least one light-emitting diode. This enables a particularly space-saving and energy-efficient light source.

[0039] Preferably, the illuminant comprises a plurality of light-emitting diodes arranged in at least two concentric circles. This enables artifact-free illumination even at different beam angles.

[0040] If, within the scope of the present invention, the term "approximately" or "approximately" or "substantially" is used in connection with values ​​or value ranges, or with properties or geometries, this is to be understood as a tolerance range that a person skilled in the art considers customary in this field. In particular, a tolerance range in connection with values ​​or value ranges when using the term "approximately" or "approximately" of ±20%, preferably of ±10%, and more preferably of ±5% is provided. Lower limits of value ranges can thus be undercut by 5% to 20%. Upper limits of value ranges can thus be exceeded by 5% to 20%. To the extent that different value ranges, for example preferred and more preferred value ranges, are specified in the present invention, the lower limits and upper limits of the various value ranges can be combined with one another.

[0041] In the following, embodiments of the invention are explained in more detail by way of example with reference to the accompanying drawings. However, the individual features resulting therefrom are not limited to the individual embodiments, but can be connected and / or combined with individual features described above and / or with individual features of other embodiments. The details in the drawings are to be interpreted as illustrative only and not restrictive. The reference symbols contained in the claims are not intended to limit the scope of protection of the invention in any way, but merely refer to the embodiments shown in the drawings.

[0042] The drawings show in FIG. 1 shows a sectional side view of a preferred embodiment of a recessed luminaire, wherein a small distance is set between a light source and a lens; FIG. 2 shows the recessed luminaire from FIG. 1, with a large distance between the lamp and the lens; FIG. 3 is an exploded perspective view of FIG. 1 with a view from below; FIG. 4 a perspective exploded view of FIG. 1 with a view from above.

[0043] In FIG. 1 to FIG. 4A preferred embodiment of a recessed luminaire 10 according to the invention is schematically shown, which forms, by way of example, a recessed ceiling luminaire. The recessed luminaire 10 comprises a housing 12 with a first and an opposite second end region 12', 12", a lamp 14 with an outer side 14' and an opposite inner side 14", a lens 16 with an outer side 16' and an opposite inner side 16", and an adjusting means 18 for adjusting a distance between the lamp 14 and the lens 16. The housing 12 has a substantially circular-cylindrical basic shape with a substantially circular housing base 20 and a FIGS. 1 and 2downwardly projecting peripheral wall. The housing base 20 corresponds to the first end region 12', and the free edge of the peripheral wall corresponds to the second end region 12". The illuminant 14 and the lens 16 have a substantially circular basic shape and are arranged substantially parallel to one another in the housing 12 such that the outer side 14' points away from the lens 16 and towards the housing base 20, the inner side 14" points towards the lens 16 and the inner side 16", the outer side 16' points away from the illuminant 14, and the inner side 16" points towards the illuminant 14.

[0044] The illuminant 14 is designed according to a preferred embodiment and comprises a substantially circular circuit board 22 and a plurality of light-emitting diodes 24 ( FIG. 3 ). The circuit board 22 has an inner side which FIGS. 1 and 2points downwards and corresponds to the inner side 14", and an opposite outer side which rests on the housing base 20 and corresponds to the outer side 14'. The light-emitting diodes 24 are arranged in three concentric circles on the inner side 14". The circuit board 22 rests with the outer side 14' on the housing base 20 and is screwed to the housing base 20 by means of screws. Consequently, the light-emitting means 14 is arranged on the first end region 12' and is detachably fastened to this end region 12'.

[0045] The lens 16 is designed according to a preferred embodiment and comprises a substantially circular plano-convex Fresnel lens 16, in which the inner side 16" is flat or planar and the outer side 16' is convex. The Fresnel lens 16 has three concentric, annular regions which are assigned to the three concentric circles of the light-emitting diodes 24.

[0046] The adjusting means 18 is designed according to a preferred embodiment and comprises a screw 26 having a screw head 26' and a screw shaft 26" with an external thread, a nut 28 with an internal thread that engages the external thread, and an actuating means. The screw head 26' is knurled, for example, so that the screw 26 is a knurled screw.

[0047] The lens 16 has a through-hole 30. The screw shaft 26" is guided through the through-hole 30 such that the screw head 26' engages the outer side 16'. The screw shaft 26" is also releasably fastened to the lens 16 by means of a lock nut 32, which engages the inner side 16", with a plastic washer 34 arranged between the lock nut 32 and the inner side 16". Consequently, the screw head 26' is also releasably fastened to the lens 16.

[0048] In the housing base 20 and the circuit board 22 there is also a through hole 36 ( FIG. 3 and 4 ) which is aligned with the through hole 30. A circular cylindrical sleeve 38 is pressed into the housing base 20, the hollow space of which surrounds the through hole 36. The nut 28 is screwed onto the free edge of the sleeve 38, which is in FIGS. 1 and 2facing upward and away from the housing base 20. Consequently, the nut 28 is secured to the lamp 14 and engages the outer side 14'. The screw shaft 26" is also guided through the through-hole 36 and the sleeve 38 into the nut 28 so that the screw 26 can be screwed into and out of the nut 28. Since the screw head 26' is secured to the lens 16, this screwing movement causes the lens 16 to be moved toward or away from the lamp 14.Consequently, the lens 16 is movably mounted on the housing 12, the screw 26 and the nut 28 connect the illuminant 14 and the lens 16 to one another in such a way that by rotating the screw 26 relative to the nut 28, the distance between the illuminant 14 and the lens 16 and thus also the beam angle can be changed, and the adjusting means 18 adjustably connects the illuminant 14 and the lens 16 to one another in such a way that this distance can be changed with the aid of the adjusting means 18.

[0049] An operator can now grasp and turn the screw head 26' from the outside without tools, even when the recessed luminaire 10 is installed, and thus turn the screw 26 in the nut 28 in order to change the distance between the lens 16 and the lamp 14 and thus also the beam angle as desired.

[0050] The actuating means is designed according to a preferred embodiment and comprises a handle 26' formed by the screw head 26'. Consequently, the actuating means is arranged on the outer side 16', releasably attached, and is located on or at this outer side 16' or in an area adjacent to this outer side 16'. The adjusting means 18 adjustably connects the illuminating means 14 and the lens 16 to one another such that the distance between the illuminating means 14 and the lens 16 can be changed with the aid of the actuating means.

[0051] The housing 12 has a scale 40 with, for example, four markings on the inner surface of the peripheral wall. This enables a desired, reproducible adjustment of the distance between the illuminant 14 and the lens 16 and thus also of the beam angle. FIG. 1A minimum setting of this distance is shown, in which the screw 26 is screwed into the nut 28 so far that the stop nut 32 rests on the inside 14" and the lens 16 is approximately at the level of the FIGS. 1 and 2 top mark. With this minimum setting, the beam angle is approximately 80°. FIG. 2 A maximum setting of this distance is shown, in which the screw 26 is screwed out of the nut 28 so far that the screw shaft 26" is still in engagement with the nut 28 and the lens 16 is approximately at the level of the FIGS. 1 and 2 lowest mark. With this maximum setting, the beam angle is approximately 10°. List of reference symbols

[0052] 10Recessed luminaire, recessed ceiling luminaire 12Housing 12' / 12"first / second end section of 12 14Light source 14' / 14"outside / inside of 14 16Lens, Fresnel lens 16' / 16"outside / inside of 16 18Adjustment device 20Housing base 22PCB 24LEDs 26Screw 26'Screw head, handle 26"Screw shaft 28Nut 30Through hole in 16 32Lock nut 34Washer 36Through hole in 20 and 22 38Sleeve 40Scale

Claims

1. Recessed light (10), in particular recessed ceiling light (10), comprising - a housing (12); - a light source (14) arranged in the housing (12); - a lens (16) disposed in the housing (12); and - an adjusting means (18) comprising - a screw (26) having a screw head (26') and a screw shaft (26") with an external thread, and - a nut (28) with an internal thread that engages in the external thread; whereby - the light source (14) has an outer side (14') facing away from the lens (16) and the lens (16) has an outer side (16') facing away from the light source (14); - the adjusting means (18) adjustably connects the light source (14) and the lens (16) to one another in such a way that the distance between the light source (14) and the lens (16) can be changed with the aid of the adjusting means (18); - the lens (16) has a through hole (30) through which the screw shaft (26") is guided; - the nut (28) engages on the outer side (14') of the light source (14); - the light source (14) has a through hole (36) through which the screw shaft (26") is guided; - the housing (12) has a housing base (20); - the screw shaft (26") is passed through the through hole (36) of the light source (14) and the nut (28); and - the screw (26) can be screwed into the nut (28) and out of the nut (28); characterized in that - the screw head (26') is attached to the lens (16) and / or engages on the outer side (16') of the lens (16); - the housing base (20) has a through hole (36); - a circular cylindrical sleeve (38) with a cavity is pressed into the housing base (20); - the cavity surrounds the through hole (36) of the light source (14); - the nut (28) is bonded to a free edge of the sleeve (38) facing away from the housing base (20); and - the screw shaft (26") is guided through the sleeve (38) into the nut (28).

2. Recessed light (10) according to claim 1, wherein - the screw head (26') engages on the outer side (16') of the lens (16); - the lens (16) has an inner side (16") facing the light source (14); and - the screw shaft (26") is detachably fastened to the lens (16) with the aid of a stop nut (32), which engages on the inner side (16") of the lens (16).

3. Recessed light (10) according to one or more of the preceding claims, wherein - the screw (26) is designed as a knurled screw or wing screw or star knob screw; and / or - the nut (28) is designed as a knurled nut or wing nut or star knob nut.

4. Recessed light (10) according to one or more of the preceding claims, wherein - the housing (12) has a first and an opposite second end region (12', 12"); - the light source (14) is arranged at the first end region (12') or the lens (16) is arranged at the second end region (12").

5. Recessed light (10) according to one or more of the preceding claims, wherein an inner surface of the housing (12) comprises a scale (40) with at least two markings.

6. Recessed light (10) according to one or more of the preceding claims, wherein - the adjusting means (18) comprises an actuating means arranged on or at the outer side (16') of the lens (16); - the adjusting means (18) adjustably connects the light source (14) and the lens (16) to one another in such a way that the distance between the light source (14) and the lens (16) can be changed with the aid of the actuating means.

7. Recessed light (10) according to claim 6-1, wherein the actuating means comprises a handle (26') arranged on or at the outer side (16') of the lens (16).

8. Recessed light (10) according to claim 7-1, wherein the handle (26') is knurled.

9. Recessed light (10) according to one or more of the preceding claims, wherein the lens (16) comprises at least one Fresnel lens.

10. Recessed light (10) according to one or more of the preceding claims, wherein the light source (14) comprises at least one light emitting diode (24).

11. Recessed light (10) according to claim 10-1, wherein the light source (14) comprises a plurality of light-emitting diodes (24) arranged in at least two concentric circles.