Lamp

Abstract

The invention relates to a lamp (1) comprising a lamp housing (2), a light source (3) disposed in the lamp housing (2), a reflection device (4) associated with the light source (3) for deflection of light emitted by the light source (3) in the direction of a light outlet opening (5) of the lamp housing (2), and a cooling device (6) associated with the light source (3) and/or with the lamp housing (2). In particular an inner side (7) of the lamp housing (2) is formed at least in some locations as the reflection device (4) and/or the cooling device (6) is formed in one piece with the lamp housing (2).

Claims

1. A lamp (1) comprising: a lamp housing (2) that defines a light outlet opening (5), the lamp housing including: a first bearing flange (25) and a second bearing edge (12) that extend along and into the light outlet opening (5), wherein the first bearing flange (25) is wider than the second bearing edge (12), a rib (30) protruding substantially perpendicular to the first bearing flange (25) from an inner surface of the first bearing flange (25) towards an inner surface (7) of a reflection wall (4) such that the rib (30) separates the first bearing flange (25) into a first bearing edge (11) and a light source retention portion, wherein the rib (30) is disposed proximal to the light outlet opening (5), such that the light source retention portion is disposed on one side of the rib (30) extending towards the reflection wall (4) and the first bearing edge (11) is disposed on an opposite side of the rib (30), and wherein the first bearing edge (11) extends towards the light outlet opening (5) and in the direction of the second bearing edge (12), the reflection wall (4) having a substantially semi-circular cross-sectional profile and disposed between the first bearing edge and the second bearing edge, the reflection wall (4) configured to deflect light emitted by a light source (3) toward the light outlet opening (5) of said lamp housing (2), wherein the reflection wall comprises the inner surface (7) and an outer surface (15) that define opposite surfaces of the reflection wall, each of the inner surface and the outer surface having the substantially semi-circular cross-sectional profile, wherein at least a portion of the inner surface (7) of the reflection wall of the lamp housing (2) is reflective, wherein the outer surface (15) of the reflection wall (4) of the lamp housing (2) defines a cooling device (6) that comprises a plurality of cooling fins (16) protruding radially outward from the outer surface (15) of the reflection wall (4), and wherein the first bearing flange (25), the second bearing edge (12), and the cooling fins (16) are integral to the reflection wall (4), the light source (3) disposed in the light source retention portion of the first bearing flange (25) and on the inner surface of the first bearing flange (25) such that the light source (3) is positioned adjacent to the light outlet opening (5) and facing the inner surface (7) of the reflection wall (4) of the lamp housing (2); and a transparent or translucent cover plate (10) that is disposed on and supported by an inner surface of the first bearing edge (11) and the second bearing edge (12) of the lamp housing (2) such that the cover plate (10) is disposed above the light outlet opening (5), covers the light outlet opening (5), and is disposed in an interior (24) of the lamp housing (2).

2. The lamp according to claim 1, characterized in that the inner surface of the reflection wall (4) is made reflective by applying a coating (8) on the inner side (7) of the reflective wall (4) of the lamp housing (2).

3. The lamp according to claim 1, characterized in that the light source (3) is formed by a plurality of LEDs (13) disposed on a printed circuit board (14).

4. The lamp according to claim 1, characterized in that the plurality of cooling fins (16) have the same height (17) and/or the same length (18).

5. The lamp according to claim 1, characterized in that openings at oppositely disposed longitudinal ends (19, 20) of said lamp housing (2) are covered by end cover plates (21) that are detachably fastened to said lamp housing.

6. The lamp according to claim 5, characterized in that support flanges (22) protrude in particular on either longitudinal end (19, 20) from the outer surface (15) of said lamp housing (2), through which support flanges (22) fastening screws (23) can be passed for detachably fastening said oppositely disposed end cover plates (21).

7. The lamp according to claim 1, further comprising a suspension device (29) that is formed on the outer surface of the reflective wall at an uppermost point of the lamp housing (2) and in between a pair of cooling fins of the plurality of cooling fins, the suspension device (29) configured to fasten the lamp to a mounting location.

8. The lamp according to claim 3, further comprising a separation layer (28) that is disposed on the bearing flange (25) such that the separation layer is disposed between the printed circuit board and the bearing flange to improve heat transfer from sides of the light source (3) in the direction of the cooling device defined by the reflection wall.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following, an advantageous embodiment of the invention is further illustrated using the figures appended in the drawing,

(2) where:

(3) FIG. 1 shows a perspective view from below onto a lamp according to the invention and

(4) FIG. 2 shows a cross-sectional view through the lamp according to FIG. 1.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

(5) FIG. 1 illustrates a lamp 1 according to the invention in a perspective view obliquely from below. Such a lamp 1 can be configured as a recessed ceiling emergency lamp, as an explosion-proof lamp and/or as a linear lamp. Lamp 1 has a semi-cylindrical lamp housing 2, which on its underside comprises a light outlet opening 5 and also respective openings at longitudinal ends 19 and 20. Respective end cover plates 21 being fixed to each other by way of fastening screws 23 are provided to cover the openings at longitudinal ends 19, 20. In order to guide fastening screws 23 along an outer side 15 of lamp housing 2, support flanges 22 are provided at longitudinal ends 19, 20 through which fastening screws 23 are guided.

(6) End cover plates 21 are approximately semi-circular in shape.

(7) On outer side 15 of lamp housing 2, a cooling device 6 is further arranged in the form of a number of cooling fins 16. These cooling fins 16 are formed in one piece with lamp housing 2, see also FIG. 2. The cooling fins extend between the longitudinal ends over the entire length 18 of lamp housing 2 and each have the same height 17, see again FIG. 2.

(8) Light outlet opening 5 is closed by a transparent or translucent cover plate 10. It rests from the housing interior 24 of lamp housing 2 on respective bearing edges 11, 12, see FIG. 2.

(9) A bearing flange 25 is along one side of light outlet opening 5 arranged with a corresponding bearing edge 11 which has a greater width as compared with oppositely disposed bearing edge 12. At the uppermost point of lamp housing 2, a suspension device 29 or a fastening device 29, respectively, is further arranged with which lamp 1 can be fastened at the respective mounting location.

(10) FIG. 2 shows a vertical sectional view through lamp 1 according to FIG. 1.

(11) According to FIG. 2, five cooling fins 16 with height 17 and length 18, see FIG. 1, extend on outer side 15 of lamp housing 2. The cooling fins are arranged substantially equidistant, where, for example, support flanges 22 or suspension device 29 can be arranged between the cooling fins on lamp housing 2.

(12) In the housing interior 24 on an inner side 7 of lamp housing 2, a reflection device 4 is formed It can be formed directly by inner side 7 of lamp housing 2 or also by a special reflective coating 8 of inner side 7. Reflection device 4 can be formed on the entire inner side 7 or only in part thereon, to reflect in particular light from a light source 3 in the direction toward lamp outlet opening 5, see the various light beams 27 according to FIG. 2.

(13) Light source 3 is arranged on bearing flange 25 as part of an edge 26 of light outlet opening 5. Light source 3 is in the embodiment illustrated formed by a plurality of LEDs 13 being arranged on a printed circuit board 14. The latter is likewise directly connected to the respective bearing flange 25, for example, by adhesive bonding or the like.

(14) It is at this point to be noted that a similar arrangement of a light source 3 can also be disposed on the opposite side of light outlet opening 5 so that respective light sources 3 can be provided on either side of light outlet opening 5.

(15) According to FIG. 2, cover plate 10 is placed from the direction of housing interior 24 on respective bearing edges 11 and 12 of light outlet opening 5. Cover plate 10 can also be fastened, for example, by a detachable connection or the like.

(16) In the embodiment illustrated, bearing edge 11 forms a portion of bearing flange 25, where a rib 30 extends vertically upwardly from bearing flange 25 into the housing interior for separating light source 3 from light outlet opening 5.

(17) It also serves to fixate light source 3 and in particular circuit board 14 with LEDs 13 disposed thereon.

(18) First heat dissipation from LEDs 13 can occur via the printed circuit board. There are a number of options for this. For example, special printed circuit board shapes can be used which exhibit particularly good thermal conductivity, such as printed circuit boards having a metal core. The heat of the LEDs can be passed, for example, to the metal core via a copper through-contact. The heat can then from the metal core be passed on directly to the lamp housing. Thermal conductivity can in this context be improved by heat-conductive paste or the like. Moreover, it is in this context of advantage if respective heat transfer is improved by mounting the printed circuit board without the surfaces to be joined being uneven and rough.

(19) Due to the shape of lamp housing 2, the respective wall is formed substantially as a half-cylindrical casing 9, see also FIG. 1. This half-cylindrical casing comprises inner side 7 and outer side 15, respectively.

(20) There is the further option that printed circuit board 14 is not placed directly on the upper side of bearing flange 25, but that, for example, a separation layer 28 is further disposed between them. It can also be formed as a heat conduction layer to enable improved heat transfer from sides of light source 3 in the direction of cooling device 6.

(21) Lamp 1 according to the invention exhibits a simple structure with reflection device 4 and cooling device 6 being integrated in lamp housing 2. No additional devices for cooling or reflection are necessary, such as a cooling element, a fan, a holder separate from the lamp housing for the light source and the like.

(22) Furthermore, devices for fastening end cover plates 21 or for fastening lamp 1, respectively, are already formed on at the lamp housing itself, cf. suspension device 29.

(23) A lamp of an overall compact structure being composed of few individual components arises which can be inexpensively and quickly produced and is versatile in use. The respective bearing flange 25 for arranging circuit board 14 is in the embodiment illustrated indeed formed as a part of edge 26, where it is also conceivable that the respective cover plate 10 of light outlet opening 5 can be placed only on bearing edges 11 and 12, where, for example, the corresponding bearing flange 25 can protrude also elsewhere from inner side 7 of lamp housing 2 into the housing interior. This gives rise in a simple manner to different arrangement options for the light source, where also several such light sources can be disposed by way of several bearing flanges in one lamp housing 2.