EP2491295B1 - Linear lamp - Google Patents

Description

Technical area

The invention relates to a line lamp according to the preamble of patent claim 1.

State of the art

document DE 1 919 505 U discloses such a line lamp. This is of the type Linestra of Osram. The line lamp in this case has an elongated glass bulb, in which a filament is received, which extends approximately along a longitudinal axis of the glass bulb. The filament is contacted by means of two pedestals formed radially on the glass bulb, which simultaneously serve to hold the line lamp in a luminaire socket.

A disadvantage of this solution is that such a line lamp has a high energy consumption. As a result, according to the European Union's EuP Directive (Energy-using Products) or Ecodesign Directive 2005/32 / EC, it will no longer be authorized from 2013 onwards.

Presentation of the invention

The object of the present invention is to provide a line lamp with a low power consumption and substantially the same luminous properties as in conventional line lamps.

This object is achieved by a line lamp having the features of patent claim 1.

Particularly advantageous embodiments can be found in the dependent claims.

According to the invention, a line lamp has an elongated piston, in particular a glass bulb. For electrical contacting and for holding the line lamp at least one base is provided. In the piston, at least one light-emitting diode as a lighting means and at least one formed as a sheet heat sink are arranged. The at least one light-emitting diode is arranged on a printed circuit board accommodated in the piston. The heat sink is configured to serve to support the circuit board, wherein two sheets are provided, which are each arranged at an end portion of the circuit board. This solution has the advantage that such a line lamp has an extremely low power consumption compared to the prior art explained in the introduction. Furthermore, advantageously with the at least one light-emitting diode, a substantially identical emission characteristic as with conventional line lamps with an incandescent filament can be achieved.

The pedestal is preferably arranged radially on a side facing away from the main emission direction of the light-emitting diode.

Advantageously, the circuit board is a FR4 board. Through the circuit board, the LED is easy to contact and durable.

Preferably, the circuit board is elongated and thus adapted to the elongated piston of the line lamp. As a result, the printed circuit board provides a large area for a plurality of light-emitting diodes. By the plurality of LEDs, a high luminosity of the line lamp is made possible and it can be achieved a more accurate adaptation to the emission characteristics of a conventional line lamp.

In order to achieve a higher heat dissipation from the light-emitting diodes or a better cooling of the light-emitting diodes, the piston is filled with a filling gas, in particular helium, which has good heat conduction properties.

To avoid shadowing within the line lamp, the LEDs can be arranged on a diode side of the circuit board.

On a side remote from the diode side underside of the circuit board electronic components for electrical supply and control of the LEDs are then advantageously arranged.

The electronic components for the electrical supply and control of the light-emitting diodes in particular comprise at least one linear linear regulator. Thus, a particularly simple and compact, in particular flat driver for the LEDs can be realized whereby the outer dimensions of conventional line lamps can be maintained and the light distribution of conventional line lamps can be replicated particularly well.

In order to achieve a good illumination of the bulb of the line lamp, the underside is arranged closer to an inner circumferential surface of the piston compared to the diode side of the printed circuit board.

In order to protect the LEDs in the manufacture and use of the line lamps from high temperatures, at least one heat sink formed as a sheet metal, in particular a copper sheet, is provided in the bulb.

With a device technology low effort, the at least one heat sink is designed such that so that the circuit board is supported.

For effective heat dissipation, a sheet is arranged in each case at an end portion of the printed circuit board. This is particularly advantageous when melting the printed circuit board in the glass bulb.

The sheet metal is preferably angled, in particular in an end region of the printed circuit board. This allows a good adaptation to the contour of the circuit board can be achieved. In particular, the angled plate has a holding leg arranged on the underside of the printed circuit board and attached thereto, and a sheet metal leg arranged approximately at a parallel distance from a transverse edge of the printed circuit board.

The retaining leg has at its longitudinal edges at least two cantilevered support arms, via which the retaining leg can be clamped to the circuit board, and wherein the support arms are supported in particular for supporting the circuit board on an inner circumferential surface of the piston. Preferably, a support arm is formed on the holding leg at a direction away from the sheet leg transverse edge, which is arranged such that it supports the circuit board in the piston together with the at least two holding arms. As a result, a cost and device technology simple mounting of the circuit board is created.

The support arm may have a V-section, in which the circuit board approximately tapered section a Is formed opening through which a power supply for the circuit board can be passed. This is fixed in a direction of displacement away from the circuit board through the opening.

In one embodiment of the invention, at least one spacer is arranged on the underside of the printed circuit board. Thus, the distance of the circuit board is ensured by the outer wall. The spacer is preferably designed as a sheet metal bent part and can also be used for heat dissipation. Furthermore, the spacer may be glued to the circuit board and serve to hold the circuit board.

In an advantageous development of the invention, the light-emitting diodes are arranged in at least one row extending approximately parallel to the lamp longitudinal axis, whereby a uniform emission characteristic of the line lamp is achieved.

The light-emitting diodes can also be arranged in two mutually parallel rows extending parallel distance, whereby a better cooling of the LEDs compared to non-spaced rows is achieved by the distance between the rows.

The piston can be coated to achieve a high aesthetic appearance.

The line lamp can be produced inexpensively if the piston has a comparatively low filling gas pressure.

In an advantageous embodiment of the invention, a phosphor is at least partially as a coating applied to a piston inner or piston outer surface of the piston.

The LEDs may have different light colors and color temperatures, in particular, the light color is implemented by controllable LED bands, in particular RGB bands. The LED strips may, for example, be light-emitting diodes arranged on a carrier foil, wherein they emit cold white, warm white, blue, red, green or RGB.

Brief description of the drawings

Fig. 1

eine schematische Längsschnittansicht einer Linienlampe gemäß einem Ausführungsbeispiel

Fig. 2

eine schematische Querschnittansicht der Linienlampe aus Figur 1

Fig. 3

einen vergrößerten Ausschnitt eines Endabschnitts der Linienlampe aus Figur 1

Fig. 4

eine perspektivische Darstellung des Endabschnitts aus Fig. 3

Fig. 5

eine schematische Darstellung der LED-Treiberschaltung einer erfindungsgemäßen Linienlampe

Fig. 6

eine schematische Längsschnittansicht einer Linienlampe gemäß einem weiteren Ausführungsbeispiel

Fig. 7

eine perspektivische Darstellung des Endabschnitts aus Fig. 7.

In the following, the invention will be explained in more detail with reference to an embodiment. The figures show:

Fig. 1

a schematic longitudinal sectional view of a line lamp according to an embodiment

Fig. 2

a schematic cross-sectional view of the line lamp FIG. 1

Fig. 3

an enlarged section of an end portion of the line lamp FIG. 1

Fig. 4

a perspective view of the end portion Fig. 3

Fig. 5

a schematic representation of the LED driver circuit of a line lamp according to the invention

Fig. 6

a schematic longitudinal sectional view of a line lamp according to another embodiment

Fig. 7

a perspective view of the end portion Fig. 7 ,

Preferred embodiment of the invention

FIG. 1 shows a schematic longitudinal sectional view of a line lamp 1 according to the invention according to an embodiment. Previous line lamps in the prior art have an incandescent filament, resulting in high energy consumption. Types of incandescent filament lamps include Linestra from OSRAM, Philinea from Philips and Ralina von Radium. Line lamps are used for example in living rooms, such as in a bathroom or kitchen or as a light bar in cabinets.

The line lamp 1 off FIG. 1 has a tubular elongated piston 2. This is made of glass, which advantageously has substantially no aging effect by external or internal radiation exposure (UV resistance). From an outer circumferential surface 4 of the piston 2 or glass piston collar approximately in a same radial direction of base 6, 8, which are spaced apart in the longitudinal direction of the line lamp 1. About this, the line lamp 1 is used in a receptacle of a conventional lamp suitable for line lamps and electrically contacted. On her front and back in FIG. 1 have the base 6, 8 each have a recess 10 through which they are engaged behind by a corresponding element of a receiving device of the lamp for mounting. At an underside of the base 6, 8 in FIG. 1 are for electrical contacting contact protrusions 12 formed. The above-described embodiment of the line lamp 1 preferably corresponds to a standard.

Within the piston 2 is an elongated circuit board 14 with a plurality of light emitting diodes or LEDs 16 - for simplicity, only a single LED provided with a reference numeral - used. Printed circuit board 14 is an FR4 board supported by fasteners discussed below. For better heat dissipation, the circuit board 14 may consist of a good heat-conducting material such as aluminum or ceramic at least in sections, but this leads to higher costs. An axial length of the printed circuit board 14 is slightly shorter than an axial length of the piston 2, whereby end portions 18, 20 of the circuit board 16 are spaced to a respective end face 22 and 24 of the piston 2.

The LEDs 16 are arranged fixedly from one of the sockets 6, 8 repellent diode side 26 of the circuit board 14 approximately parallel to the longitudinal direction in a row in a row. On a side facing away from the diode side 26 underside 28 of the circuit board 14 are electronic components or electronic elements 30, of which two by way of example in the FIG. 1 are shown, arranged for electrical supply and control of the LEDs 16.

FIG. 2 illustrates the line lamp 1 in a schematic enlarged cross-sectional view with a cutting plane through the sheet 40 FIG. 1 A distance of the diode side 26 of the printed circuit board 14 to an inner circumferential surface 32 of the piston 2 is greater than the distance between the bottom 28 to the inner circumferential surface 32 of the piston 2, wherein the distance is measured in each case in an approximately orthogonal direction to the circuit board 14. A distance from longitudinal edges of the printed circuit board 14 to the inner circumferential surface 32 is approximately equal, which also for the distance between transverse edges and the end faces 22, 24 of the FIG. 1 applies. A width of the printed circuit board 14 in FIG. 2 corresponds approximately to the width of the base 6, 8. On the diode side 26 of the circuit board 14 are two approximately at a parallel distance extending to each other extending diode rows 34, 36 are formed. By the spacing of the diode rows 34, 36 is a high heat dissipation from the LEDs 16, see FIG. 1 , allows. It is also conceivable instead of two diode rows 34, 36 to arrange only one or more than two rows of diodes. Due to the parallel spacing of the diode rows 34, 36 and in the direction of the base 6, 8 - from a longitudinal axis of the piston 2 ago - offset printed circuit board 14 is further provided a large-scale illumination of the piston 2 by the LEDs 16.

The piston 2 in the FIG. 1 is filled with helium as a good heat-conducting filling gas with a comparatively low filling pressure. A low filling gas pressure is advantageous in terms of production technology and leads to low costs. Due to the good heat-conducting filling gas is in use of the line lamp 1, a large amount of heat from the LEDs 16 and the electronic elements 30 for cooling to the piston 2 can be discharged and can be discharged from this to the environment. The heat flow is in the FIG. 1 exemplified by arrows 37. Furthermore, the large-area design of the printed circuit board 14 and the Pistons 2 large heat transfer areas created to fill gas.

In the production of the line lamp 1, the spaced apart from the piston 2 printed circuit board 14 is remelted by the glass-made piston 2, whereby temperatures of about 1000 ° C arise. To protect the LEDs 16 and the electronic elements 30 from the high temperatures at the end portions 18, 20 of the circuit board 14 heat traps or heat sinks made of a cost-effective copper sheet 38, 40 are arranged. In these areas occur in the production of the highest temperatures. The configuration of the sheets 38, 40 is below in FIG. 3 explained in more detail. Furthermore, during the remelting of the printed circuit board 14 by the piston 2, an unspecified active air cooling takes place. FIG. 3 shows an enlarged section of a right end portion of the line lamp 1 from FIG. 1 This is angled approximately at right angles and has an approximately parallel to the bottom 28 of the circuit board 14 fixed holding leg 42. Another sheet metal leg 44 extends approximately parallel to a transverse edge 47 of the circuit board 16 in the FIG. 3 up. The sheet 40 generates by the design and arrangement such little or no shadowing in the use of the line lamp 1 and provides a large heat transfer surface to the surrounding gas.

Furthermore, collar of a respective longitudinal edge 48 and 50, see FIG. 2 , of the holding leg 42 of the sheet 40, a holding arm 52 and 54 facing away from the base 6, 8 in the direction of the inner circumferential surface 32 of the piston 2 from. The holding arms 50 and 52 are arranged in a V-shape relative to one another and each supported with their pointing away from the plate 40 end portion 56 and 58 on the inner circumferential surface 32 of the piston 2 from. In the area of longitudinal edges 60, 62, see FIG. 1 , the printed circuit board 14, the support arms 50 and 52 are bent with a radius such that in each case an arc portion 64 and 66 is formed, which is concave on its side facing in the direction of the circuit board 14 side. In the transition region from the arc section 64 and 66 to the substantially straight extending arm 50 and 52, this is in each case at the respective longitudinal edge 60, 62 of the circuit board 14 and act on the circuit board 14 by serving as springs arc sections 64, 66 with a clamping force. The plate 40 is thus connected via the retaining arms 52, 54 with the circuit board 14 non-positively, positively and / or cohesively.

On a transverse edge 68 of the retaining leg 42 facing away from the sheet metal leg 44, a support arm 70 is formed, which extends away from the underside 28 of the printed circuit board 14 and is supported on the inner circumferential surface 32 of the piston 2. Since the sheet 38 is formed corresponding to the sheet 40, the circuit board 14 is supported via the end portions 18 and 20 of the sheets 38 and 40 via their respective support arms 52, 54 and their respective support arm 70 within the piston 2.

The support arm 70 of the sheets 38 and 40, see FIG. 3 , Is configured at its end facing away from the circuit board 14 end portion 72 is approximately W-shaped, whereby a toward the circuit board 14 facing V-section 74 is formed. This is arranged in each case in the region of the base 6, 8. A serving for contacting power supply 76 extending from the base 8 in the FIG. 3 to the circuit board 14 extends is passed through an opening, not shown, in the bending region of the V-section 74. The opening is designed such that the power supply 76 is blocked in a direction away from the printed circuit board 14 through the opening of the V-section 74 and only in the direction of the printed circuit board 14 is hindurchbewegbar through the opening. The V-section 74 is thus formed according to a cutting clamp. That in the FIG. 1 left sheet 38 is also configured so that a power supply 78 is also fixed by this.

In the FIG. 4 is in a perspective view in the FIG. 3 shown end portion 20 of the line lamp 1 shown. The end sections 56, 58 of the holding arms 52, 54 are slightly curved, as a result of which the end sections 56, 58 abut at least in sections on the inner circumferential surface 32 with an approximately convex surface.

The width of the support arm 70 corresponds approximately to half the width of the transverse edge 68 of the retaining leg 42. The support arm 70 is formed approximately centrally from the transverse edge 68. The width of the support arms 52, 54 corresponds approximately to that of the support arm 70, wherein these approximately from an end region of the longitudinal edges 48, 50, see FIG. 2 , extend adjacent to the transverse edge 68 from.

It is conceivable to form the sheets 38, 40 as SMD components in order to simply connect them to the printed circuit board 14.

That in the FIG. 1 left sheet 38 is formed corresponding to the sheet 40. The printed circuit board 16, in addition to or instead of the sheets 38, 40 thermally conductive materials However, this would lead to higher costs in both cases. In any case, can be dispensed with the line lamp 1 according to the invention to heat sink, resulting in a low weight.

Fig. 5 shows a schematic representation of the LED driver circuit 71 of a line lamp according to the invention 1. The circuit has to power the LEDs 16 two parallel linear regulator 72, which allow a simple, flat and compact design. However, other embodiments are conceivable, in particular those with only one linear linear regulator. The arrangement shown is also characterized by good EMC properties.

Fig. 6 shows the schematic longitudinal sectional view of a line lamp according to another embodiment. The line lamp 1 is similar in the basic structure of those FIG. 1 and has a tubular elongated piston 2 made of glass. From an outer circumferential surface 4 of the piston 2 or glass piston collar approximately in a same radial direction of base 6, 8, which are spaced apart in the longitudinal direction of the line lamp 1. About this, the line lamp 1 is used in a receptacle of a conventional lamp suitable for line lamps and electrically contacted. On her front and back in FIG. 1 have the base 6, 8 each have a recess 10 through which they are engaged behind by a corresponding element of a receiving device of the lamp for mounting. At an underside of the base 6, 8 in FIG. 1 are formed for making electrical contact contact projections 12. The above-described embodiment of the line lamp 1 preferably corresponds to a standard.

Within the piston 2 is analogous to Figure 1 to 3 an elongated printed circuit board 14 with a plurality of light emitting diodes or LEDs 16 - for simplicity, only a single LED provided with a reference numeral - used. An axial length of the printed circuit board 14 is slightly shorter than an axial length of the piston 2, whereby end portions 18, 20 of the circuit board 16 are spaced to a respective end face 22 and 24 of the piston 2.

The LEDs 16 are arranged fixedly from one of the sockets 6, 8 repellent diode side 26 of the circuit board 14 approximately parallel to the longitudinal direction in a row in a row. On a side facing away from the diode side 26 underside 28 of the circuit board 14 are electronic components or electronic elements 30, of which two by way of example in the FIG. 6 are shown, arranged for electrical supply and control of the LEDs 16.

The circuit board 14 is fixed by means of two spacers 45 in the glass bulb 2, to which the spacers 45 are glued to the circuit board 14 and the glass bulb 2. For electrical contacting serve contact devices 49, which are formed as sheet metal bent parts. In the end area
The piston 2 is filled with helium as a good heat-conducting filling gas with a comparatively low filling pressure. The heat flow thus proceeds in the manner exemplified by arrows 37. Furthermore, the large-area design of the printed circuit board 14 and the piston 2 creates large heat transfer areas for the filling gas.

The production of the line lamp 1 is carried out in the manner described above, i. From the piston 2 spaced circuit board 14 from the existing glass flask 2 melted. To protect the LEDs 16 and the electronic elements 30 from the high temperatures at the end portions 18, 20 of the circuit board 14 heat sinks or heat sinks made of a cost-effective copper sheet 77, 48 are arranged. In these areas occur in the production of the highest temperatures. The plates 77,48 are angled approximately at right angles and have an approximately parallel to the bottom 28 of the circuit board 14 fixed holding leg 42. Another sheet leg 44 extends approximately parallel to a transverse edge 47 of the circuit board 14 upwards. The sheets 77, 48 generate by the design and arrangement such little or no shadowing in the use of the line lamp 1 and provides a large heat transfer surface to the surrounding gas.

Fig. 7 shows a perspective view of the end portion Fig. 6 , On the circuit board, the plate 77, the spacer 45 and the contact devices 49 are attached. The contact device 49 consists of a bent sheet metal with a V-shaped receptacle for a contact wire 79. The spacer 45 is formed from a U-shaped bent sheet metal and bonded to the piston 2. Each of these components is a Blechbiegebauteil and can therefore be used advantageously for heat dissipation. It is conceivable to form the sheets 77, 48 as well as the spacers 45 and the contact devices 49 as SMD components, in order to simply connect them to the printed circuit board 14. Thus, the heat from the circuit board 14 can be dissipated particularly well. The width the sheets 77,48 corresponds in the embodiment approximately the width of the circuit board 14, which allows a particularly simple handling with good heat dissipation. However, embodiments are also conceivable in which the width of the sheets 77, 48 is greater than the width of the printed circuit board 14, whereby the heat dissipation is improved, or embodiments in which the width of the sheets 77, 48 is smaller than the width of the printed circuit board 14 is, whereby the handling is improved.

That in the FIG. 6 left plate 77 is formed according to the plate 48. In addition to or instead of the sheets 77, 48, the printed circuit board 14 may comprise thermally conductive materials, which however would lead to higher costs in both cases. In any case, can be dispensed with the line lamp 1 according to the invention to heat sink, resulting in a low weight.

The existing of glass piston 2 is characterized by a high aesthetic appearance compared to a plastic piston. By a coating of the piston 2, the aesthetic appearance can be further increased and the lighting properties and the emission characteristics of the line lamp 1 are changed. In addition, glass has a higher light transmission than plastic.

It is conceivable to carry out the LEDs 16 without a housing.

The LEDs 16 are deviating from the exemplary embodiment arbitrarily arranged. It can also be different Light colors and color temperatures (for example, multicolored line lamps 1) are created.

The line lamp 1 has, for example, a lamp power (without driver) between 4 and 5 W and a luminous flux between 250 and 280 lm, wherein such a luminous flux corresponds to that of a conventional line lamp with an incandescent filament.

Disclosed is a line lamp with a tubular bulb made of glass. For electrical contacting and for holding the line lamp at least one base is provided. In the piston at least one light emitting diode is arranged as a light source. It may also be advantageous to arrange the pedestals at one or both ends, in particular at right angles to the main emission direction of the glass bulb.

Claims (17)

1. Line lamp having an elongate bulb (2), in particular a glass bulb, at least one base (6, 8) being provided for making electrical contact and for holding the line lamp (1), characterized in that at least one light-emitting diode (16) is arranged in the bulb (2) as an illuminant and at least one heat sink constructed as a sheet metal (38, 40), the at least one light-emitting diode (16) being arranged on a printed circuit board (14) accommodated in the bulb (2) and the heat sink being designed in such a way as to serve to hold the printed circuit board (14), two metal sheets (38, 40) being provided which are each arranged at an end section (18, 20) of the printed circuit board (14).
2. Line lamp according to claim 1, characterized in that the printed circuit board is an FR4 board.
3. Line lamp according to claim 1 or 2, wherein the printed circuit board (14) is elongated and equipped with a plurality of light emitting diodes (16).
4. Line lamp according to one of the preceding claims, the bulb (2) being filled with a filling gas, in particular helium.
5. Line lamp according to one of claims 2 to 4, wherein the light emitting diodes (16) are arranged on a diode side (26) of the printed circuit board (14).
6. Line lamp according to claim 5, wherein the printed circuit board (14) has a lower side (28) facing away from the diode side (26) with electronic components (30) for the electrical supply and control of the light emitting diodes (16).
7. Line lamp according to claim 6, wherein the lower side (28) is located closer to an inner surface of the bulb (2) than the diode side (26).
8. Line lamp according to one of the preceding claims, a copper sheet being provided in the bulb (2) as a heat sink.
9. Line lamp according to claim 8, the metal sheet (38, 40) being angled, having a holding leg (42) which is arranged on the lower side (28) of the printed circuit board (14) and fastened to the printed circuit board (14), and having a metal sheet leg (44) which is arranged approximately at a parallel spacing from a transverse edge (46) of the printed circuit board (14).
10. Line lamp according to claim 9, wherein the holding leg (42) has at its longitudinal edges (48, 50) at least two projecting holding arms (52, 54), by means of which the holding leg (42) is clamped to the printed circuit board (14), and wherein the holding arms (52, 54) are supported on an inner surface (32) of the bulb (2) for holding the printed circuit board (14).
11. Line lamp according to claim 10, wherein a support arm (70) is formed on the holding leg (42) on a transverse edge (68) pointing away from the sheet metal leg (44), which support arm (70) is arranged in such a way that, together with the at least two holding arms (52, 54), it holds the printed circuit board (14) in the bulb (2).
12. Line lamp according to claim 11, wherein the support arm (70) has a V-section (74), in the portion of which, tapering towards the printed circuit board (14), there is formed an opening through which a current lead (76, 78) for the printed circuit board (14) can pass, which current lead is fixed through the opening in a displacement direction away from the printed circuit board (14).
13. Line lamp according to one of the preceding claims, the light emitting diodes (16) being arranged in at least one row of diodes (34, 36) extending parallel to the longitudinal axis of the lamp.
14. Line lamp according to claim 13, two rows of diodes (34, 36) extending parallel to one another being provided.
15. Line lamp according to one of the preceding claims, the bulb (2) being coated.
16. Line lamp according to one of the preceding claims, wherein a fluorescent material is applied as a coating at least in sections to an inner or outer surface of the bulb (2).
17. Line lamp according to one of the preceding claims, the light-emitting diodes having different light colours and colour temperatures, the light colour being implemented by controllable LED strips, in particular RGB strips.

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