DE102008029323A1 - Lighting device for use in lighting chain, comprises front side with lighting surface and rear side with attaching unit, where semiconductor lighting element, particularly light emitting diode is provided, which is arranged at rear side - Google Patents

Abstract

The lighting device (1) comprises a front side (2) with a lighting surface and a rear side (3) with an attaching unit (4). A semiconductor lighting element, particularly light emitting diode is provided, which is arranged at the rear side. The attaching unit comprises a suction cup (8).

Description

The The invention relates to a lighting device with a front side with a lighted area and a back with a fastening device and a light chain with a such lighting device.

to general lighting is a lighting device "DOT-it" the Fa. OSRAM known. This consists of an aluminum housing of 67 mm diameter and 22 mm height, the one front with a designed as a transparent dome light area and a back having a fastening device. The emerging from the luminous surface Light is shining through three white Light emitting diodes produced whose power consumption together at 0.3 W lies. The beam angle is in the range between 30 ° and 40 °. through successive printing operation on the transparent dome of the lighting device is the lighting device switched, namely in four switching stages that allow dimming: (a) all 3 LEDs are activated; (b) two of the three LEDs are activated; (c) only one LED is activated; (d) the lighting device is switched off. The lighting device draws its power from three micro-batteries (LR3 AAA). The battery life is an average of 100 Hours. The lighting device has a low weight of only 65 g. As fastening means are an adhesive surface, a Magnetic foil and a hook plate known. Exemplary application areas include, for example, the housing sector, industrial technology, Automotive applications, effect lighting, flashlight replacement, emergency lighting (Safety).

It The object of the present invention is a lighting device with a front with a luminous surface and a back to provide with a fastening device, which extended functionality having.

These Task is by means of a lighting device and a light chain according to the respective independent Claim solved. Preferred embodiments are in particular the dependent ones claims removable.

The Lighting device has a front side with at least one luminous surface and a back with a fastening device.

At a front lighting area or lighting area, the lighting device emits light to the environment from. The illuminated area For example, with an open recess or a translucent (transparent or opaque) cover. The presence of such light area corresponds to the presence of at least one at the front radiating light source, hereinafter also referred to as a primary light source referred to as. That of the at least one primary light source radiated light passes through the front luminous surface. The Type of primary Light sources is first arbitrary and may include, for example compact fluorescent lamps, wherein Light-emitting diodes are preferred as light sources. The lighting device Thus, in particular one or more primary or front-side light-emitting diodes have, whose light is emitted on the front side. A possible one LED lighting device is, for example, the DOT-it LED light or a derived light.

Further the lighting device has at least one semiconductor light-emitting element arranged on the rear side, in particular light-emitting diode, on. As a result, the lighting device added another function as a backlight, which in particular for decoration purposes can be configured to To achieve the halo of light (corona) effects.

It is preferred if several back arranged Semiconductor lighting elements are present, in particular a plurality of symmetrical arranged semiconductor light-emitting elements, especially radially symmetrical arranged semiconductor light-emitting elements.

The Fastening device is - in Contrary example to lamps - preferably without contact areas designed for producing an electrical contact.

The Although fastening device, for example, an adhesive surface, a Magnetic foil and / or a hook plate include, but preferably comprises a suction cup. This makes a particularly simple, even multiple Fixing the lighting device on all sufficiently smooth and hard surfaces (such as glass, Plexiglas, tiles, etc.) without further preparation.

It a lighting device is preferred in which the at least one on the back arranged semiconductor light emitting element radiates laterally to backward, So a respect the position of the lighting device side to rear main emission having. Due to the lateral radiation is a particularly pronounced corona effect (Lateral lighting effect, Lichtkranzeffekt) can be generated. By a rearward radiation direction becomes a contrast brighter, but spatially reached limited lighting.

Particularly preferred is a lighting device comprising a rearwardly arranged base on which the fastening device is mounted. This allows a holder for the Be fastening device, z. B., a screw, especially easy to implement. Also, the base can provide a comparatively freely designable base for mounting the rear side arranged semiconductor light-emitting elements.

Of the Socket can be used as a separate manufactured component at the back be attached, or an integral part of the lighting device be, z. B. by co-manufacture of the housing of the lighting device with the base, z. B. by an injection molding process.

Preferably is at least one back arranged Semiconductor light-emitting element arranged on the base. The pedestal provides namely also a comparably freely designable basis for attaching the on the back arranged semiconductor light-emitting elements ready.

Then it may be preferred for easy lateral radiation be that if at least one back arranged semiconductor light-emitting element on a lateral surface of the Socket is arranged.

Of the Base may for example have a circular cylindrical or frusto-conical outer contour.

alternative or additionally Can be at least one back arranged semiconductor light-emitting element directly on the back be arranged, for example in the absence of a base or at Presence of a free area of the backside next to the pedestal.

to more homogeneous light distribution, it may be preferred if the at least a back arranged Semiconductor light-emitting element at least partially by a scattering element ('Diffuser') is surrounded, z. B. a scattering film.

alternative or additionally can at least one optic, z. B. at least one lens, for beam guidance of Be provided light from the at least one back arranged semiconductor light-emitting element is emitted.

The At least one semiconductor light-emitting element can advantageously a side beam light-emitting element, in particular side-beam LED include, d. that is, a main radiation direction of the semiconductor light-emitting element is substantially parallel to the mounting surface.

It can additionally or alternatively also at least one front-radiating semiconductor light-emitting element be preferred, d. that is, a main radiation direction of the semiconductor light-emitting element is substantially perpendicular to its mounting surface.

It is preferred if the at least one rear side arranged semiconductor light-emitting element at least one knows or monochrome emitting LED and / or a color changeable LED multi-chip module includes.

Generally the semiconductor light-emitting element preferably comprises at least one Led. The semiconductor light-emitting element can be used, for example, as LED module with a light emitting diode or multiple light emitting diodes present. The individual LEDs can each monochrome or multi-colored, z. B. white, radiate. In presence several LEDs can these z. B. same color (monochrome or multi-colored) and / or different colors to shine. For example, an LED module may have several individual LEDs ('LED clusters'), which together result in a white mixed light can, z. B. in 'cold white' or 'warm white'. To generate a white Mixed light includes the LED cluster prefers light emitting diodes in the primary colors red (R), green (G) and blue (B) light up. It can be one or more Colors can also be generated by several LEDs at the same time; so are Combinations RGB, RRGB, RGGB, RGBB, RGGBB etc. possible. however the color combination is not limited to R, G and B (and A). to Generation of a warm white Shades can for example, one or more amber LEDs 'amber' (A) may be present. For LEDs with different colors, these can also be controlled in this way be that the LED module radiates in a tunable RGB color range. To produce a white one Light from a mixture of blue light with yellow light can also with phosphor provided blue LED chips are used, for. B. in surface mounting technology, z. In thin-GaN technology. Then, an LED module can also have several white single chips, resulting in a simple Scalability of the luminous flux can be achieved. The single chips and / or the modules can be equipped with suitable optics for beam guidance, z. B. Fresnel lenses, collimators, and so on. It can at one contact several identical or different LED modules be arranged, for. B. several similar LED modules on the same Substrate. Instead or in addition to inorganic light emitting diodes, z. Based on InGaN or AlInGaP, In general, organic LEDs (OLEDs) can also be used. Also z. B. diode lasers are used.

to easy adjustment of the lighting device, this can be a switch having at least two positions, namely (a) all (in particular front side and back arranged) light sources and (b) all light sources off.

In the switch is preferably the front integrated side lighting surface. Alternatively, the switch may comprise a touch-sensitive switch spaced from the luminous surface.

• – Keine Lichtabstrahlung ('aus');
• – Aktivierung einer Lichtabstrahlung nur aus der vorderseitigen Leuchtfläche ('Frontlicht/Primärlicht an'); und
• – Aktivierung einer Lichtabstrahlung aus der vorderseitigen Leuchtfläche und von dem mindestens einen rück seitig angebrachten Halbleiter-Leuchtelement ('Alles an').

However, for the variable adjustment of the light image from the illumination device, it is preferred if the switch has at least the following positions:

• - No light emission ('off');
• - Activation of a light emission only from the front side lighting surface ('front light / primary light on'); and
• - Activation of a light emission from the front side luminous surface and of the at least one rear side mounted semiconductor light-emitting element ('Everything on').

It In particular, a lighting device is preferred in which the switch additionally the has the following position: Activation of a light emission only from the at least one back mounted semiconductor light-emitting element ('only backlight / secondary light on'). This allows the Lighting device can also be operated as a pure decorative light.

It is further preferred when the switch switch positions for Color change of the backlight, d. h., The rear-side lighting elements has, for example, by selective driving of LEDs certain Color or by appropriate control of color tunable Multi-chip LEDs.

It is further preferred when the switch switch positions for Dimming the front light emission, for example by reducing the power to all LEDs and / or by switching on or switching off individual LEDs.

to another function as a security element comprises the lighting device Furthermore, a motion detector, when activated at least the turned off lighting device is turned on. In addition, can for example, when activated, a down-dimmed lighting device a maximum brightness be switched up.

The Lighting device can be waterproof, z. Eg for outdoor applications. A waterproof lighting device is under the name "DOT-it waterproof "from available from OSRAM.

The Lighting device can be battery / battery operated or mains powered be. In a network operation can, in particular height, reduction the lighting device, the drive circuit externally between a Power supply and the lighting device to be interposed.

The Luminous chain has at least one such lighting device and is preferably modular with other such lighting devices expandable.

The Lighting devices are preferably connected in series, in particular electrically serial. The luminous chain is preferably mains operated with one - preferably external - common Drive circuit, since so all lighting devices conveniently can be switched together. In addition, a, in particular elevation, reduction the lighting device can be achieved.

In The following figures illustrate the invention with reference to exemplary embodiments described in more detail schematically. It can for better clarity identical or equivalent elements with the same reference numerals be provided.

1 shows an exploded view in oblique view of a lighting device according to a first embodiment;

2 shows a side view of the lighting device 1 with rear-mounted LEDs;

3 to 6 show in side view analogous to 2 further embodiments of the lighting device;

7 shows in plan view a luminous chain with a plurality of lighting devices.

1 shows a lighting device 1 with a front side 2 and a back 3 , On the front side 2 There is a luminous surface, which is not visible in this representation. At the back 3 is a fastening device 4 for fastening the lighting device 1 arranged, which has a circular cylindrical base 5 with a center in the base 6 introduced screw thread 7 and a sucker 8th with a screw thread 7 matching screw 9 having. The base 5 can be configured as a hollow body or as a solid body. With its the back 3 facing base 10 of the pedestal 5 This is the entire surface with the back 3 connected, z. B. via an adhesive. The flat back 3 is thus with this fastening device 4 equipped. The body 11 the lighting device 1 (without the fastening device 4 ) here corresponds to a commercially available so-called "DOT-it" luminaire from OSRAM. Because the DOT-it light 11 battery powered, do not need cables from the lighting device 1 to be led out.

On the back of the lighting device 1 arranged, ie, directly or indirectly on the back 3 attached, there is at least one light-emitting diode as a semiconductor light-emitting element, as will be explained in more detail below.

2 shows the lighting device 1 out 1 in side view. On the lateral surface 12 the base are the light-emitting diodes arranged at the back 13 shown attached. The light-emitting diodes 13 radiate forwardly as front-beam LEDs, ie their main emission direction (here in or parallel to the xy-plane) is perpendicular to their attachment surface or parallel to the normal of the lateral surface 12 , The LEDs 13 shine here laterally with respect to the lighting device 1 or its axis of symmetry S, which is drawn parallel to the z-axis. In other words, the light-emitting diodes arranged at the back radiate 13 with respect to the lighting device 1 laterally. As the light-emitting diodes 13 equidistant and thus with respect to the symmetry axis S angle symmetrical on the jacket surface 12 are arranged, a halo (corona) is generated with a comparatively uniform light intensity. From the front view (against the z-axis) are the back 3 and thus the pedestal 5 , the back side arranged light-emitting diodes 13 and the suction cup 8th not visible. The base 5 with the LEDs 13 is laterally encircling a translucent, opaque scattering wall 15 surrounded by PMMA to further homogenize the light emission. For heat dissipation is the back 3 with pedestal 5 and the light emitting diodes 13 open at the bottom.

At the front 2 is a domed area switch 16 with ring-shaped edge 17 and translucent cover (not visible) in the inner recess of the rim 17 available. The cover serves as a luminous surface for white high-performance light-emitting diodes behind it. The beam angle of the illuminated area is about 30 ° to 40 °.

In a starting position, the lighting device 1 switched off, so that neither the primary high-performance light-emitting diodes nor the rear-mounted, secondary light-emitting diodes 13 radiate. By pressure on the surface switch 16 this is brought into a further switching position, in which only the forward-emitting primary LEDs light up; this corresponds to an activation of a light emission only from the front side luminous surface. By pressing again on the surface switch 16 this is brought into yet another switching position, in addition to the rear side arranged light-emitting diodes 13 to shine; this corresponds to an activation of a light emission both from the front side of the luminous area and from the rear-mounted LEDs 13 , By pressing again on the surface switch 16 this is brought into yet another switching position, in which only the rear side arranged light-emitting diodes 13 to shine; this corresponds to an activation of a backlighting by the LEDs 13 , Another actuation of the surface switch 16 switches the lighting device 1 out again.

Alternatively, a dimming function may also be integrated, in which by successive actuation of the switch 16 The high-power LEDs are dimmed, either by reducing the current flow through all high-power LEDs or by selectively turning off LEDs.

The primary light-emitting diodes are connected via a drive circuit in the form of a driver 18 powered, which by the body 11 is surrounded and is shown here only schematically. The driver 18 draws its power from batteries not shown here and is with the switch 16 and the LEDs connected.

The rear-mounted LEDs 13 are designed as multi-chip LED modules. The module has several surface-mounted LED chips that radiate in the RGB color space (eg in the colors red, green and blue), and may also comprise white LED chips. The driver circuit 18 can selectively drive the LED chips to color tune the radiated light.

The LEDs 13 can be mounted on a band-shaped, flexible substrate (so-called LED Flexband), which is preferably offered prefabricated and separable, which in turn is mounted on the base, z. B. by means of a double-sided adhesive tape. A possible LED Flexband is offered as LINEARlight Flex series LM1XX (eg LM10X with front-beam LEDs or LM11X with side-beam LED in different colors, including different shades of white, and as multi-color spotlight) from the company OSRAM, Germany.

Only for a better description of the lighting device 1 is the one with the sucker 8th connected screw 9 in the bolted state shown as visible.

This lighting device 1 is particularly easy to fasten on all sufficiently smooth, hard surfaces without further preparation. It can generate a variety of lighting functions (eg corona lighting) while remaining compact. It is inexpensive to produce.

3 shows a further embodiment of a lighting device 19 in which now the socket is missing and instead the suction cup 8th with his screw 9 directly into a thread of the body 11 is screwed. The rear-mounted light diode 13 are now on a stiff, flat FR4 substrate 20 (alternatively: on a flexible substrate) attached, which is flat on the back 3 of the body 11 is applied. The light-emitting diodes 13 thus radiate with respect to the lighting device 19 backwards, with the light emitting diodes 13 have a radiation angle and thus emit a portion of the side. In contrast to the embodiment of 2 the corona tends to be smaller but brighter. In addition, the lighting device 19 a lower height.

4 shows a further embodiment of a lighting device 21 , in which now in contrast to the embodiment of 3 the rear-mounted LEDs 22 Side beam LEDs are, which emit mainly parallel to their mounting surface, so have a main emission in the xy plane, of the lighting device 21 radially outward. This will be through the rear mounted LEDs 22 produced light ring similar to the embodiment according to 2 larger, but less bright than in the embodiment of 3 ,

5 shows a further embodiment of a lighting device 23 , which now has a socket 24 which is frustoconical from the body 11 out down to the suction cup 8th rejuvenated. On the lateral surface 25 of the pedestal 24 are front emission LEDs 13 attached, the main emission direction we conditions of the inclined lateral surface 25 pointing diagonally behind. As a result, a radiate ring is made possible, the expansion and brightness between the two variants 2 and 4 on the one hand and 3 on the other hand. The scattering plate or diffuser plate 26 is the shape of the lateral surface 25 adapted and self-frustoconical, but downwardly open to carry the suction cup 8th and for the discharge of hot air.

6 shows yet another embodiment of a lighting device 27 similar to the embodiment of 4 , in which now instead of a scattering plate a plastic strip 28 around the LEDs 22 is arranged around, in which optical elements in the form of lenses 29 are integrated to beam forming at least part of the of the LEDs 22 make radiated light. There is every LED 22 a separate lens 29 assigned.

7 shows in plan view a luminous chain 30 from several serial over cables 31 connected lighting devices 32 wired via a separate drive device 33 operated, which in turn via a network connection 34 is fed. This allows the lighting devices 32 without own control / driver circuit and without battery compartment, which saves costs and allows a compact height. In addition, such is a control of all lighting devices 32 together via the drive device 33 possible. The lighting devices 32 otherwise, for example, as one of the above-described lighting devices 1 . 19 . 21 . 23 be designed. The light chain 30 is particularly modular, ie, that lighting devices 32 the luminous chain 30 variably added or out of the luminous chain 30 can be removed.

In the plan view is the switch 16 with the annular edge 17 and the one from the ring 17 included transparent cover 35 , which serve as a luminous area or light emission area for three high-performance light-emitting diodes arranged thereunder 36 serves, shown. The high-performance light-emitting diodes 36 represent the primary light source.

Of course it is the present invention is not limited to the embodiments shown.

Instead of a suction cup, for example, a magnetic sheet, an adhesive tape, a hook plate o. Ä. be used for attachment.

alternative can arranged at the rear LEDs monochrome, including White, be executed. The back arranged LEDs can configured as multichip modules or as separately packaged LEDs (LED lamps) be. Possibly. can several LED strands be present of several interconnected LEDs, z. In Shape of LED flexbands. Leave the LED strands preferably control separately. Each strand preferably has LEDs of a single color (possibly including white); several strands can be one to another have different color.

Also does not need the front side luminescent surface to be round, but For example, it can be oblong with a corresponding linear arrangement of the associated light sources, especially LEDs, executed be. An elongated one LED lighting device with a front side with at least one luminous area and a back with a fastening device is, for example, as 'DOT-it Linear' by OSRAM, Germany, available.

1

lighting device

2

front

3

back

4

fastening device

5

base

6

Floor space

7

screw thread

8th

suction cup

9

screw part

10

Floor space

11

body

12

lateral surface

13

led

14

emitter area

15

stray wall

16

surface switch

17

edge

18

Tax- and driver circuit

19

lighting device

20

FR4 substrate

21

lighting device

22

arranged backwards LED

23

lighting device

24

base

25

lateral surface

26

diffusion plate

27

lighting device

28

Plastic strips

29

lens

30

light chain

31

electric wire

32

lighting device

33

Control / driver device

34

mains connection

35

transparent cover

36

primary LED

Claims (15)

Lighting device ( 1 ; 19 ; 21 ; 23 ; 27 ; 32 ), comprising a front side ( 2 ) with at least one luminous area ( 32 ) and a back ( 3 ) with a fastening device ( 8th ), further comprising at least one rear side disposed semiconductor light-emitting element ( 13 ; 22 ), in particular light-emitting diode. Lighting device ( 1 ; 19 ; 21 ; 23 ; 27 ; 32 ) according to claim 1, wherein the fastening device comprises at least one suction cup ( 8th ). Lighting device ( 1 ; 19 ; 21 ; 23 ; 27 ; 32 ) according to claim 1 or 2, wherein the at least one rear side arranged semiconductor light-emitting element ( 13 ; 22 ) radiates laterally to the rear with respect to the lighting device. Lighting device ( 1 ; 23 ) according to one of the preceding claims, in which the lighting device has a base ( 5 ; 24 ), on which the fastening device ( 8th ). Lighting device ( 1 ; 23 ) according to claim 4, wherein the at least one rear side arranged semiconductor light-emitting element ( 13 ) on the base ( 5 ; 24 ), in particular on a lateral surface ( 12 ; 25 ) of the socket ( 5 ; 24 ) is arranged. Lighting device ( 1 ; 23 ) according to claim 5, wherein the base ( 5 ; 24 ) has a circular cylindrical or frusto-conical outer contour. Lighting device ( 19 ; 21 ; 27 ) according to one of the preceding claims, in which the at least one rear-side arranged semiconductor light-emitting element ( 13 ; 22 ) directly on the back ( 3 ) is arranged. Lighting device ( 27 ) according to one of the preceding claims, in which the at least one rear-side arranged semiconductor light-emitting element ( 22 ) at least partially by a scattering element ( 15 ; 26 ) or an optical element ( 29 ) is surrounded. Lighting device ( 21 ) according to one of the preceding claims, in which the at least one semiconductor luminous element is a side-beam luminous element ( 22 ). Lighting device ( 1 ; 19 ; 23 ) according to one of the preceding claims, in which the at least one semiconductor luminous element is a front-beam luminous element ( 13 ). Lighting device ( 1 ; 19 ; 21 ; 23 ; 27 ; 32 ) according to one of the preceding claims, in which the at least one semiconductor light-emitting element ( 13 ; 22 ) comprises at least one white emitting LED and / or a color changeable LED multi-chip module. Lighting device ( 1 ; 19 ; 21 ; 23 ; 27 ) according to one of the preceding claims, further comprising a switch ( 16 ) with at least the following positions: - No light emission; Activation of a light emission only from the front luminous area ( 32 ); and - activation of a light emission from the front luminous surface ( 32 ) and of the at least one rear-mounted semiconductor light-emitting element ( 13 ; 22 ). Lighting device ( 1 ; 19 ; 21 ; 23 ; 27 ) according to claim 12, in which the switch ( 16 ) additionally has the following position: activation of a light emission only from the at least one rear-mounted semiconductor light-emitting element ( 13 ; 22 ). Lighting device according to one of the preceding Claims, further comprising a motion detector when activated at least the switched off lighting device is turned on. Luminous chain ( 27 ) with several Leuchtvorrich tions ( 29 ) according to any one of the preceding claims.