DE102010044353A1 - Floor or table lamp - Google Patents

Abstract

A lamp, in particular a floor lamp or table lamp, is provided with a lamp base (11), a lamp column (12) extending from the lamp base (11) and a first end of the lamp column (12) opposite to the lamp base (11). arranged lamp head (13), the lamp head (13) first illuminant (41) for emitting indirect light from an upper side of the lamp head (13) and second illuminant (14) for bundled and directed emission of direct light from an underside (15) of the lamp head (13), and wherein the first (41) and the second lamps (14) are dimmable separately from one another, the lamp head (13) being rotatable relative to the lamp base (11) or to the lamp column (12) and wherein the first (41) and / or second lighting means (14) are designed as light-emitting diodes.

Description

The invention relates to a lamp, in particular a floor or table lamp, with a lamp base, extending from the lamp stand light column and a lamp head, which is disposed at a lamp leg opposite end of the light column and comprises first and second light sources.

Luminaires, in particular in the form of floor or table lamps, are used, for example, for illuminating workplaces in offices. In this case, due to limited space, the luminaire can not usually be placed in such a way that optimum illumination of a work surface of the workplace can be achieved by means of the known luminaires. Often, a floor lamp must be placed at a distance from the desk due to desk size or other circumstances. The same applies to table lamps, which usually have to be arranged in the outer areas of the work table to keep the work surface of the workplace for work purposes free. Depending on the particular local conditions, a required orientation and a distance to be maintained at the workplace, therefore, there are different requirements for the lamp used in each case, in particular with respect to their brightness and direction of the radiated light from the lamp. An important aspect here is a dazzling effect for the user, which has to be taken into account when aligning a directional light beam and influences a positioning of the luminaire.

Increasingly, light-emitting diodes, so-called LEDs, are being used as lighting means in recent times. They represent small punctiform light sources, which allow a free arrangement and are therefore not bound to rigid shape specifications, such as fluorescent tubes or similar bulbs. However, luminaires with LEDs known from the prior art have a relatively large-volume design and a rather moderate light output with at the same time very limited adjustability of a light distribution. This is due in particular to a strong heat development of the LEDs. Due to their special light radiation spectrum, LEDs can not radiate the generated heat output in the form of heat to the environment. Instead, they require heat sinks to which they can derive the heat output generated via direct contact. However, this leads at high light and consequently high heat outputs to the above-mentioned disadvantage of a generally bulky design due to larger heat sinks, which also causes a limited adjustability of the lamp and thus the light distribution. In order to keep the heat output of the LEDs as low as possible and thus to achieve a small dimensioning of the heat sink, therefore, the light output is often kept low, which, however, also results in the above-mentioned disadvantage of low light output.

The object of the invention is therefore to provide a luminaire that can be flexibly adapted to different locations and at the same time provides the best possible illumination of a workplace with the most compact possible design.

This object is achieved by a luminaire according to claim 1. Advantageous embodiments emerge from the subclaims.

Accordingly, a luminaire, in particular a floor or table lamp, is provided with a lamp base, a light column extending from the lamp leg and a lamp head arranged at a first end of the lamp column opposite the lamp leg. This comprises first lamps for emitting indirect light from an upper side of the lamp head and second lamps for bundled and directed emission of direct light from a lower side of the lamp head. The first and second bulbs are separately dimmable. Furthermore, the lamp head is rotatable relative to the lamp base or to the light column and the first and / or second lighting means are designed as light-emitting diodes, so-called LEDs.

The lamp base thus serves as a base of the lamp and can be depending on the design of the lamp for surface placement on a level surface or with a clamping device for attaching the lamp, for example, on or on a table top executed. Starting from the lamp base extends a light column, which carries at its remote end the lamp head. The term "light column" is to be understood in addition to a simple columnar rod or tube with a cylindrical shape as well as a column with a rectangular, diamond-shaped or other suitable cross-section, for example. Also possible is a multi-part design of the column, after which several of the above columns extend from the lamp stand together to the lamp head and wear this together.

According to the above description, the first and / or the second lighting means are designed as light-emitting diodes. Their use allows a high light output and lamp life with a simultaneously flexible possibility of arrangement, so that even design-oriented complex arrangements and designs are possible. The for radiating indirect light from the top The first illuminant provided in the luminaire head thus preferably provides a diffuse illumination of the space to be illuminated. They are arranged such that the radiated light exits on an upper side of the lamp head from this and is thus emitted in the direction of a ceiling to be reflected from there reflected in the room. In this way, indirect room lighting is provided without the light emitted by the first lighting means for direct illumination of the workplace. For this purpose, the first lighting means can either be oriented in such a way that the emitted light is radiated directly in the desired direction or is directed to the upper side via corresponding deflecting devices, for example mirrors or light guides, in order to emerge from the lamp head and radiate towards the ceiling become.

In contrast, the second bulbs bundled and directed emit a direct light from the bottom of the lamp head to illuminate a workplace directly. Corresponding deflecting devices for deflecting and emitting the emitted light from the underside of the luminaire head can also be provided for the second luminous means. The above-mentioned separate dimmability of both lamps allows a particularly advantageous adaptation of the illumination. Thus, dimming of the second lighting means allows a first adjustment of the illumination of the workstation, which is adapted, for example, to an activity currently carried out at the workstation. Likewise, thus spatial requirements, such as an individual distance of the lamp to the workplace, are taken into account. Only, for example, can be sufficient for a reading activity on the workplace a medium-strength illumination when the lamp is located in close proximity to the workplace. If, on the other hand, the luminaire has to be positioned at a certain distance, the second luminous means can be adjusted with a greater intensity, so that the necessary illumination is achieved on the workstation despite the spacing. The same could apply to the possible dimming of the first light source. For example, it is sufficient for an indirect illumination medium intensity of a room or a wider environment of the workplace, that the first lighting means are set to a medium intensity level. On the other hand, if the workstation or the surrounding space is to be illuminated more brightly, the first lighting means can also be operated with higher intensity, so that the light falling diffusely on the workstation is strong enough to support the second lighting means.

In this way, for example, can be dispensed with further third lighting means, which are provided for example in the prior art to emit diffused light also on the underside of the lamp.

This described above, very special control of the two bulbs is to be understood only as an example. Of course, the intensities of the respective emitted light can also be regulated differently.

In addition, the lamp head is rotatable. This is particularly important in the event that the second lighting means are arranged eccentrically on the lamp head, so that by rotation of the lamp head their spatial position is variable and can be adapted to local conditions. For example, the lamp head can be rotated if necessary so that shading by the light column can be avoided or at least reduced. Preferably, the lamp head has a plurality of arm portions extending away from a common center within a common plane and each having at least at a respective distal end of the arm portions second lighting means.

Optics are associated with the second light sources optics for bundling and redirecting the radiated direct light. This means that one or more optics are arranged in a beam path of the light emitted by the second light means and at least partially focus this and additionally deflect it by a defined angle. If the second illuminants are arranged, for example, on an underside of the luminaire head and have a downwardly pointing emission direction, optics arranged in each case in the beam path can tilt the beam path by a defined angle in order to direct the beam path selectively onto the work surface.

According to one embodiment, each of the optics comprises an adjustment device for varying the orientation of the directed radiation. This means that the beam path, for example, is deflected by a fixed angle with respect to the normal emission direction of the second light source and can be spatially aligned by means of the adjusting device while maintaining the fixed angle. Furthermore, the adjusting device can be designed such that also the deflection angle is variable.

According to a further embodiment, at least one housing of the lamp head is at least partially made of metal and includes integrated cooling fins for dissipating heat, which of the first and / or second Bulbs is generated during operation of the lamp. Because of the relatively good thermal conductivity of metals, the light-emitting means designed as light-emitting diodes can be brought into contact with the housing such that it serves to dissipate the heat generated by the light sources. For the best possible dissipation of heat, the housing may for this purpose include special cooling fins, which are integrated into the housing. Preferably, the cooling fins are integrally connected to the housing so as not to interrupt a thermal conductivity by gaps, joints or other joints of the components. In this way, the cooling fins provided can be made comparatively small and compact, so that also a compact design of the housing of the lamp head can be achieved.

Furthermore, the lamp comprises at least one operating device for operating and controlling the first and second lighting means, wherein the at least one operating device is associated with the lamp base.

In the context of the present description, an operating device means at least one voltage supply for the lighting means and at least one control for changing the operating voltage or for dimming the lighting means.

Such operating devices usually also develop a great deal of heat during operation, which also has to be dissipated. In contrast to lights according to the prior art, however, the operating device is not arranged as usual in the lamp head near the light source to be controlled, but outsourced to the area of the lamp base. Consequently, the operating device eliminates as a heat source in the region of the lamp head, so that its required minimum size and the dimensions of the heat sink can be reduced accordingly. In the field of the lamp base, the at least one operating device can be arranged comparatively easily, since there is usually sufficient space and thus appropriately sized heatsink can be provided without a negative impact on the smallest possible minimum size of the lamp head and thus on the overall aesthetics of the lamp to effect.

In order to optimize the heat dissipation in the lamp head, the housing according to a further embodiment on a lower side and / or at least one side surface ventilation openings for supplying cooling air into the housing and is at least partially opened on an upper side for discharging the cooling air from the housing. In this way, an automatic flow through the housing with cooling air is effected to a small extent, which is introduced at ambient temperature on the underside or in the region of the side surface of the housing in the housing through the ventilation openings provided there and flows through the heat sink on the inside of the housing and thus deprives the housing and the heat sinks heat. The thus heated cooling air rises in the housing and can escape through the open top of the housing. By this targeted flow through the housing with cooling air and the cooling effect thereby caused the heat sink can be downsized again and designed to be compact.

Preferably, the luminaire comprises a temperature sensor for determining the instantaneous operating temperature of the first and / or second luminous means, wherein the first and / or the second luminous means are dimmable as a function of the determined instantaneous operating temperature. This means that in the event of an unexpected exceeding of a defined maximum temperature of the housing or the lighting means, for example due to corresponding environmental influences, the lighting means are at least temporarily automatically dimmed. This means that the operating current for the respective lighting means is regulated downwards and reduced by the at least one operating device so as to likewise reduce the heat output generated by the lighting means.

Preferably, the first and / or second lighting means each comprise at least two different types of light emitting diodes having different characteristics. For example, light-emitting diodes with high efficiency, but at the same time cold light and comparatively moderate color rendering, can thus be combined with LEDs for the respective light-emitting means, which, however, have a low efficiency, but a warmer light and a better color rendering. The combination of the two LED types achieves high energy efficiency with a simultaneously pleasant light color and good color rendering.

The invention will be explained in more detail with reference to the accompanying drawings. Show it:

1 a lamp according to the invention in a perspective view obliquely from below,

2 a detailed perspective view of a housing portion of the lamp with second light sources,

3 the view according to 2 wherein the second lighting means are rotatable,

4 the lamp head of the lamp according to the invention in a perspective view obliquely from above,

5 a lamp base of the luminaire according to the invention in a perspective view with a control gear,

6 a arranged on the lamp head adjusting the optics in a perspective detail view obliquely from below,

7 the lamp head of the lamp according to the invention 1 in side detail view and

8th the lamp head with integrated cooling fins in a perspective view obliquely from above.

In 1 is a lamp designed as a floor lamp 10 with a lamp stand 11 , one from the lamp stand 11 extending light column 12 and a lamp head 13 shown at one of the lamp base 11 opposite first end of the light column 12 is arranged. The lamp head 13 comprises first lighting means for emitting indirect light from an upper side of the lamp head (not shown) and second lighting means 14 for bundled and directed direct emission of light from a bottom 15 of the lamp head 13 , The lamp head includes a plurality of arm portions extending away from a common center within a common plane and each one of the second lamp means at least at a respective distal end of the arm portions 14 exhibit. The first (not shown) and the second bulbs 14 are separated from each other manually by means of a dimmer switch 16 dimmable. The lamp head 13 is relative to the lamp stand 11 or relative to the light column 12 rotatable. Preferably, the first and second bulbs 14 designed as light-emitting diodes.

2 shows a perspective detail view of an arm portion of the lamp head 13 with a second light source 14 that in the area of the bottom 15 of the lamp head 13 is arranged. On the bottom of the bulb 14 is in the beam path of the second light source 14 radiated light an optic 21 arranged for bundling and deflecting the radiated light. Are the second bulbs 14 For example, in such a way that they have a vertically extending radiation direction V, then this emission direction with the aid of the optics 21 deflected by the fixed angle α with respect to the actual radiation direction V.

3 shows the in 2 illustrated arm portion of the lamp head 13 with the second light source 14 and the optics 21 , where the optics 21 is rotatable, as illustrated by a double arrow. This means the optics 21 in the illustrated embodiment in a vertical plane in the region of the likewise vertically extending underside 15 of the lamp head 13 is rotatable, so according to 2 always a deflection of the emitted light with respect to the vertical takes place.

4 shows the lamp head 13 in a perspective view obliquely from above. In the area of the three protruding arm sections are each first light sources 41 arranged, which are arranged for emitting light from an upper side of the lamp head. They are intended for diffuse and indirect illumination of the space surrounding the luminaire. For dissipating heat or heat output which is generated by the first lighting means during operation of the luminaire, cooling fins are in the region of the first luminous means 43 provided, which contact the light-emitting means heat-conducting and thus provide for a dissipation of the heat generated. Due to their comparatively large surface, the cooling fins conduct the heat at least partially over a large area to the surrounding air. In the illustrated embodiment, the cooling fins are integral with the housing of the lamp head 13 connected. Preferably, the cooling fins and the housing at least in the region of the cooling fins made of metal. Thus, the housing can contribute to the cooling of the bulbs due to the forwarded by the cooling fins on the housing heat to the cooling, so that the cooling fins can be dimensioned accordingly compact.

Furthermore, in 4 an adjusting device 42 hinted that to the in 3 indicated changing the orientation of the directional radiation of the second light source 14 (not shown) are provided. On the operation of the adjustment is below 6 received.

5 shows the lamp base 11 and extending from the lamp stand 11 extending light column 12 , Furthermore, in the area of the lamp base 11 or on this a control gear 51 arranged to operate and control the first and second lighting means. This has a power connection 52 for connection to a mains supply as well as optional connection options 53 in the form of a multiple socket for connecting other devices such as computers, printers or other powered devices used in the workplace.

6 shows in a perspective view obliquely from below an arm portion of the lamp head 13 , where the bottom 15 (compare 1 ) is removed, only for demonstration purposes, the adjustment 42 for the optics or the optics 21 to present himself. The adjusting device 42 is designed as an annular disc, which the optics 21 encloses and by means of several arranged on its circumference noses 61 is tangibly formed to rotate the adjusting device. In the illustrated embodiment are on the adjusting device 42 further along the annular course several extensions 62 arranged between the the optics 21 is trapped or locked.

7 shows the lamp head 13 in a side view. Here it can be seen that the underside 15 of the lamp head 13 spaced apart from a housing 71 of the lamp head 13 is arranged. Between the two elements are the adjusting devices 42 arranged and can thus easily from the outside over the noses 61 the adjusting device 42 be rotated so that the orientation of the directed radiation can be adjusted.

Another function of the gap caused by the spacing 72 will be described below in 8th explained. 8th shows an arm portion of the lamp head 13 in a perspective view obliquely from above. The gap 72 represents a ventilation opening in the side surface of the lamp head, which is provided for supplying cooling air into the housing. Through the gap 72 Thus, ambient air can flow into the housing, wherein these in the region of the cooling fins 43 absorbed by this heat and thus heated. The heated cooling air rises due to thermal effects upwards and can escape freely through open at the top housing on the top of the lamp head. In this way, a particularly advantageous cooling of the cooling fins and thus a particularly effective dissipation of the heat output generated by the lamps can be achieved.

LIST OF REFERENCE NUMBERS

10

Light (floor lamp)

11

the lamp

12

lamp column

13

lamp head

14

second light source

15

Bottom of the lamp head

16

dimmer switch

21

optics

41

first light source

42

adjustment

43

cooling fins

51

control gear

52

mains connection

53

power strip

61

nose

62

projections

71

casing

72

vent

Claims (8)

Luminaire, in particular floor or table lamp, with - a lamp base ( 11 ), - one of the lamp stand ( 11 ) extending light column ( 12 ) and - one on the lamp stand ( 11 ) opposite first end of the light column ( 12 ) arranged lamp head ( 13 ), wherein the lamp head ( 13 ) - first lamps ( 41 ) for emitting indirect light from an upper side of the lamp head ( 13 ) and - second illuminants ( 14 ) for bundled and directed emission of direct light from a bottom side ( 15 ) of the lamp head ( 13 ), and wherein the first ( 41 ) and the second light sources ( 14 ) are separately dimmable, wherein the lamp head ( 13 ) relative to the lamp base ( 11 ) or to the light column ( 12 ) and wherein the first ( 41 ) and / or second light source ( 14 ) are designed as light-emitting diodes. Luminaire according to claim 1, wherein the second lighting means ( 14 ) Optics ( 21 ) are associated for bundling and redirecting the radiated direct light. Luminaire according to claim 2, wherein each of the optics ( 21 ) an adjusting device ( 42 ) for changing an orientation of the directed radiation. Luminaire according to one of claims 1 to 3, wherein at least one housing ( 71 ) of the lamp head ( 13 ) is at least partially made of metal and integrated cooling fins ( 43 ) for dissipating heat, which of the first ( 41 ) and / or second light sources ( 14 ) during operation of the luminaire ( 10 ) is produced. Luminaire according to one of the preceding claims, wherein the luminaire ( 10 ) at least one operating device ( 51 ) to operate and control the first ( 41 ) and second light source ( 14 ) and the at least one operating device ( 51 ) the lamp base ( 11 ) assigned. Luminaire according to one of the preceding claims, wherein the housing ( 71 ) of the lamp head ( 13 ) on a lower side ( 15 ) and / or at least one side surface ventilation openings ( 72 ) for supplying cooling air into the housing ( 71 ) and on an upper side at least in sections for discharging the cooling air from the housing ( 71 ) is open. Luminaire according to one of the preceding claims, wherein the luminaire ( 10 ) a sensor for determining a current operating temperature of the first ( 41 ) and / or second light source ( 14 ), the first ( 41 ) and / or the second lighting means ( 14 ) are dimmable depending on the determined current operating temperature. Luminaire according to one of the preceding claims, wherein the first ( 41 ) and / or second light source ( 14 ) each comprise at least two different types of light-emitting diodes with different characteristics.

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