DE20002092U1 - Lighting device for a work place - Google Patents

Description

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Docter-Optics GmbH, Mittelweg 29, 07806 Neustadt

Lighting device for a workplace

The invention relates to a device for indirect and largely glare-free illumination of a workplace, for example a desk or work table, consisting of a support column with a lower, plate-like base accommodating a housing with a light body, reflector and cover, and an upper, flat reflector.

A device is known for indirect and largely glare-free lighting of part of a living space. This device consists of a support column, the lower part of which is held by a plate-like base. On this base there is a housing which accommodates a light source, for example a metal halide lamp, a reflector and a cover. The light produced by the light source is radiated via the reflector and the cover onto another, flat reflector which is located at the upper end of the support column. This reflector has a circular base, is made of frosted glass and is pivotably connected to the support column. The light from the light source can then be reflected to a predetermined location in the living space via this reflector. Such a device can also be used to illuminate a workplace, but the light distribution is not optimal because a large part of the light is also emitted next to the workplace that is actually to be illuminated.

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The invention is therefore based on the object of creating a device for indirect and largely glare-free lighting of a workplace, for example a desk or work table, which ensures that only the workplace is illuminated, and as evenly as possible. The proportion of light extending beyond the workplace should be kept as low as possible.

To achieve this object, according to the invention, in a device of the type described at the outset, it is proposed that the flat reflector attached to the top of the support column has at least one reflector field inserted into a frame, which is formed from several adjacent reflector segments that are convex towards the bottom, and an optical system is assigned to the luminous element in the housing.

With such a device, which is placed next to a desk or work table, the workplace is illuminated with an almost uniform light intensity, thus creating good working conditions. The amount of light that goes beyond the workplace is extremely small. This is particularly due to the fact that the optical system projects the aperture onto the reflector, thus preventing the reflector from being overexposed.

Further features of a device according to the invention are disclosed in claims 2 to 7.

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The invention is explained in more detail below with reference to an embodiment shown in a drawing.
Show

Figure 1 is an elevational view of a device according to the

Invention and
Figure 2 is a view of the underside of the top of the support column

attached reflector.

Figure 1 of the drawing shows a device that is used for indirect and largely glare-free lighting of a workplace, for example a desk or work table. This device consists of a plate-like base 1 on which a guide body 2 and a housing 3 are located. The housing 3 accommodates a known light source, for example a metal halide lamp, a reflector and a diaphragm, which are not shown in the drawing. In addition, an optical system is housed in the housing, which consists of at least one precisely calculated lens or objective.

A support column 4 is inserted into the guide body 2, which carries a frame 5 at its upper end. This frame 5 accommodates a flat reflector 6 (Figure 2). In the illustrated embodiment, the reflector 6 is formed from four reflector fields 7, which in the illustrated embodiment have a rectangular cross-section and which are inserted into corresponding recesses 8 in the frame 5. Each reflector field 7 consists of several adjacent and

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downwardly convex reflector segments 9, which in the embodiment shown also each have a rectangular base area. Other shapes of the base areas are also possible. The convex designs of the reflector segments 9 advantageously have the shape of a partial spherical surface. Each reflector field 8 is formed in at least two layers and consists of at least a clear front layer and a metallized film behind it. The front layer is advantageously made of plastic; the metallized film can be clear or diffuse. The metallized film is advantageously made of a plastic film vapor-coated with aluminum, which is firmly connected to the front layer. The reflector field 8 is advantageously manufactured in one operation by deep drawing. If the luminous element in the housing 3 is now switched on, its light shines very precisely onto the reflector 7 through the optical system and the provided aperture. Since the reflector is not perpendicular to the axis, the image of the aperture would normally be distorted. To prevent this, the aperture must be distorted in a defined manner and have a trapezoidal cutout. In addition, the aperture is tilted around the optical axis. The reflector then illuminates the work area or illuminates it very precisely. If necessary, the inclination of the frame 5 and thus of the reflector 6 can be adjustable.

The frame 5 is advantageously provided on its rear side with a housing 10 which carries several slats 11. Behind the slats 11, in the housing 10 there is at least

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a fluorescent lamp (not shown in detail) whose light radiates upwards. This also indirectly illuminates the room in which the workstation is located. If required, the fluorescent lamp in the housing 10 can be switched on separately from the light source in the housing 3.

In order to be able to transport the device easily, a roller 12 is provided on the side of the base 1. By slightly tilting the support column 4 backwards, the device 1 can then be moved over the roller 12.

A lens is advantageously arranged between the luminous element and the cover in the housing 3. The cover is designed in conjunction with the lens in such a way that an accurate optical image of the light emitted by the luminous element is achieved on the reflector 6 attached to the top of the support column and it is impossible for light to reach the side of the reflector 6.

Claims (8)

1. Device for indirect and largely glare-free lighting of a workplace, for example a desk or work table, consisting of a support column with a lower, plate-like foot accommodating a housing with a lamp, reflector and cover and an upper, flat reflector, characterized in that the flat reflector ( 6 ) fastened to the top of the support column ( 4 ) has at least one reflector field ( 7 ) inserted into a frame ( 5 ), which is formed from a plurality of adjacent, downwardly convex reflector segments ( 9 ) and an optical system is assigned to the lamp in the housing. 2. Device according to claim 1, characterized in that each reflector field ( 9 ) is designed in at least two layers and is formed at least from a clear front layer and a metallized film located behind it. 3. Device according to claim 2, characterized in that the front layer is made of plastic. 4. Device according to claim 2, characterized in that the metallized film is clear or diffuse. 5. Device according to at least one of claims 1 to 4, characterized in that the frame ( 5 ) receiving the reflector ( 7 ) is equipped on its rear side with at least one luminous element, for example a fluorescent lamp. 6. Device according to claim 1, characterized in that the optical system is formed from at least one lens or objective. 7. Device according to at least one of claims 1 to 6, characterized in that the foot ( 1 ) is equipped with at least one roller ( 12 ). 8. Device according to claim 7, characterized in that the roller ( 12 ) is mounted laterally on the foot ( 1 ).