DE102006034324B4 - Reflector with prism structure - Google Patents

Abstract

One-piece reflector, which has a main body made of glass with a diameter between 1 and 15 cm and a receptacle integrated in the reflector for at least one lamp, characterized in that the main body is provided with reflection prisms.

Description

Field of the invention

The invention relates to a prism reflector and a lighting device with a prism reflector.

Background of the invention

Prism reflectors are known. For example, the Reichspatentschrift shows DE 554 562 A a lampshade for street lamps, which is partially equipped with prismatic reflectors.

A disadvantage of such prism reflectors has been shown that they usually have a too low efficiency, that is, a large part of the light emitted by a lamp is not reflected, but leaves the reflector on its back.

A disadvantage of such prism reflectors is in particular that even slight displacements of the luminous means relative to the reflector can have a greatly reduced efficiency result.

Next reflectors are known from practice, which are provided instead of reflection prisms with a reflective coating. Such a mirror coating is complicated to manufacture and may tend to flake off. This tendency to flaking off is intensified in particular by the high temperature load of the reflector in the case of powerful light sources, for example in digital projectors (beamers) and vehicles.

Object of the invention

The invention is the object of the invention to provide a reflector in which the mentioned disadvantages of the prior art are reduced.

In particular, the object of the invention to provide a lighting device, which is provided with a prism reflector and has an improved efficiency.

It is another object of the invention to provide a lighting device which can be used for interior lighting, in particular provided with halogen incandescent bulbs, and has a high efficiency.

Another object of the invention to provide an easily replaceable combination of reflector and light source, which can be used for both pure lighting tasks and for digital projectors.

Summary of the invention

The object of the invention is already achieved by a reflector and by a lighting device according to one of the independent claims.

Preferred embodiments and further developments of the invention can be found in the respective subclaims.

According to the invention, a reflector is provided, which comprises a receptacle for a luminous means and has a main body, which is provided at least in sections with reflection prisms.

By integrating the receptacle for the lamp in the reflector good alignment of the lamp is achieved. In addition, an easily replaceable combination of lamp and reflector can be provided, which is an easily replaceable unit, which is particularly suitable for digital projectors and halogen reflectors for lighting indoors.

According to a preferred embodiment of the invention, the main body of the reflector is formed substantially rotationally symmetrical.

In particular for digital projectors, a parabolically configured main body is provided, which essentially generates a parallel light emission.

Alternatively, the main body may also be elliptical, whereby a spotlight may be provided.

In particular, for lighting tasks in the interior but other designs are provided. Reflectors are provided with an opening angle between 10 ° and 60 °.

To achieve good efficiency, the reflection prisms preferably extend substantially radially from the receptacle for the luminous means, that is to say that the reflection prisms extend essentially in a star shape from a center of the reflector and at the same time run substantially tangentially to the inner surface of the reflector main body.

In a preferred embodiment of the invention, the reflector is integrally formed. For example, the reflector can be provided as a glass pressed part.

Alternatively, a transparent plastic material is also considered, although glass has the higher optical quality and a higher temperature stability for most applications.

The reflector main body preferably has between 10 and 100 and more preferably between 20 and 25 reflection prisms. It has been found that with a number of about 30 reflection prisms in a reflector with a halogen bulb sets a particularly good efficiency.

The reflector main body, which is preferably rotationally symmetrical, has a diameter between 10 and 15 cm, preferably between 2 and 10 cm and particularly preferably between 3 and 6 cm.

There are provided in particular with halogen lamps equipped reflectors with a diameter of about 50 mm. The inventor has found that even smaller reflectors can be provided as prism reflectors with acceptable efficiency.

The reflection prisms have at the tip an edge radius of less than 0.3 mm, preferably less than 0.1 mm and more preferably less than 0.05 mm. This small edge radius reduces the efficiency of the reflector.

Correspondingly, the edges at the transitions of the individual reflection prisms are designed with an edge radius of less than 0.3 mm, preferably less than 0.1 mm and particularly preferably less than 0.05 mm.

In a further development of the invention, the reflection prisms proceed essentially radially from the receptacle for the luminous means and are each rotated from one end to the other end between 1 and 20 °, preferably between 2 and 10 °. The reflection prisms thus do not run exactly radiating, but it is intended to rotate them in particular between 4 and 6 °. This embodiment results in a more pleasing optical appearance of the reflector.

In a further development of the invention, the receptacle for the lighting means has a fit for precise adjustment of the lighting means. The fit may be, for example, a cone or the like. For the purposes of the invention, the term "fit" is understood to mean any means which ensures that the lighting means is used in a defined position.

This prevents the position from deviating from the desired position when the illuminant is inserted or when the illuminant is replaced, since the efficiency of the prism reflector according to the invention can be greatly impaired by inaccurate adjustment of the illuminant.

In a development of the invention, the inner surface of the reflector main body is structured at least in sections. In particular, it is provided to provide the inner surface of the reflector main body with facets.

It has been found that, in particular light-collecting structures such as along the surface curved cylindrical lenses improve the efficiency of the reflector.

Also, a faceting, which achieves by a refraction of the emitted light from the lamp that rays are diffracted in the direction of an axis perpendicular to the reflection prism axis, improves the efficiency of the reflector.

Alternatively, the inner surface of the reflector can also be made smooth.

The invention further relates to a lighting device which is designed with a reflector according to the invention.

The lighting device comprises a lighting means, which is preferably adjusted and fixed in the reflector.

In particular, the bulbs can be glued or cast.

Such a configuration provides a compact, exchangeable illuminant, in which the reflector is exchanged together with the light bulb.

Depending on the type of lamp used, the reflector can be provided with a cover panel absorbing in particular UV radiation.

The cover can also serve as splinter protection, especially in digital projectors.

The lighting device according to the invention is designed such that the ratio of light emitted forward to backward is more than 1.5, preferably more than 1.8, and more preferably more than 2.2%.

Thus, a lighting device is provided which emits more than 2/3 of the light forward.

Preferably, a halogen lamp is used as the light source.

The invention is intended in particular for digital projectors, in which lamps with very high light output and, associated therewith, usually very high heat generation are used.

Furthermore, an insert is provided in vehicle headlights.

Brief description of the drawings

The invention will be described below with reference to the drawings 1 to 7 be explained in more detail.

1 shows a partially broken side view of an embodiment of a reflector according to the invention,

2 shows a sectional view of a reflector according to the invention,

3 shows schematically a rear view of a reflector according to the invention,

4 shows a plan view of an embodiment of a reflector according to the invention,

5 shows a plan view of an alternative embodiment of a reflector,

6 shows an embodiment of a lighting device according to the invention,

7 shows a schematic detail view of a reflector according to the invention 3 ,

Detailed description of the drawings

Referring to 1 should the essential features of an embodiment of a reflector according to the invention 1 be explained in more detail. The reflector 1 includes a main body 2 and a recording for a light source 4 , The main body 2 is substantially rotationally symmetric about an axis of rotation 5 educated.

The recording for the bulb 4 is located at the base of the main body 2 and in turn is not rotationally symmetrical.

In this illustration is the right side of the reflector 1 broken up. On the left side of the reflector you can see the reflection prisms 3 which is substantially radially from the receptacle for the bulb 4 go out and go up in a star shape.

The reflector 1 consists of pressed glass and is preferably equipped with a halogen bulb (not shown).

The reflector 1 has about 30 reflection prisms 3 on. The reflection prisms 3 , which are star-shaped around the axis of rotation 5 Run, essentially follow the inclination of the main body 2 ,

In order to achieve better efficiency, it is also possible to deviate from this essentially tangential course in sections (not shown).

2 schematically shows a sectional view of an embodiment of a reflector according to the invention. In this sectional view are especially the glass walls 6 represented the main body, which seamlessly into the receptacle of the bulb 4 pass.

The reflector is thus integrally formed. The recording for the bulb 4 has a substantially tapered fit 7 on. This ensures that the lighting means (not shown) is arranged in a defined position.

At the light exit side is the reflector 1 with a cover 8th provided, which is glued to a circumferential ridge. The cover 8th is formed of a UV-absorbing material and also serves as splinter protection.

3 schematically shows a rear view of an embodiment of a reflector according to the invention 1 , To recognize are in particular the 30 reflection prisms 3 , which star-shaped around the recording for the light source 4 run.

The recording for the bulb has two bushings 10 for the contacts of the bulb (not shown). Equipped with a light source (not shown), the reflector so in a lamp (not shown) can be used.

4 shows a plan view of the front side of an embodiment of a reflector according to the invention. The main body 2 of the reflector is smooth in this embodiment, so that the light beams (not shown) can pass through the smooth surface in the reflection facets.

5 shows an alternative embodiment of the reflector 1 in which the inner surface of the reflector main body 2 is provided with facets. By means of the facets, the light beams (not shown) can be aligned in a targeted manner in the direction of the normals of the reflection prisms.

The efficiency is further improved when the facets are formed as curved cylindrical lenses.

6 shows schematically an embodiment of a lighting device according to the invention 11 , The lighting device 11 consists of a reflector 2 in which a light source 12 , here configured as a halogen incandescent lamp, glued. The light source is optimally positioned for optimal reflector efficiency 2 to reach.

A cover 8th prevents the escape of UV radiation and also serves as splinter protection.

Referring to 7 , which shows a detailed view of an embodiment of a reflector, the geometry of the reflection prisms 3 be explained in more detail. The reflection prisms 3 which is star-shaped from the receptacle for a bulb 4 go out, have at the tips 13 an edge radius of less than 0.3 mm. The same applies to the transition edges 14 between the individual reflection prisms.

The reflection prisms 3 have a point angle, so an angle at the top 13 of 90 °.

It is understood that the invention is not limited to a combination of the above-mentioned features, but that the skilled person will combine all the features mentioned, as far as appropriate.

LIST OF REFERENCE NUMBERS

1

reflector

2

main body

3

reflection prism

4

Recording for bulbs

5

axis of rotation

6

glass wall

7

fit

6

cover plate

9

web

10

execution

11

lighting device

12

Lamp

13

top

14

Transition edge

Claims (24)

Integrally formed reflector having a main body made of glass with a diameter between 1 and 15 cm and a built-in reflector for at least one light source, characterized in that the main body is provided with reflection prisms. Reflector according to the preceding claim, characterized in that the main body is formed substantially rotationally symmetrical. Reflector according to claim 2, characterized in that the main body is formed substantially parabolic. Reflector according to claim 2, characterized in that the main body is formed substantially elliptical. Reflector according to one of the preceding claims, characterized in that the reflection prisms emanate substantially radially from the receptacle for the lighting means. Reflector according to one of the preceding claims, characterized in that the reflector main body between 10 and 100, preferably between 20 and 50 reflection prisms. Reflector according to one of the preceding claims, characterized in that the reflector main body has a diameter between 2 and 10 cm, preferably between 3 and 6 cm. Reflector according to one of the preceding claims, characterized in that the reflection prisms at least partially at the tip have an edge radius of less than 0.3 mm, preferably less than 0.1 mm and more preferably less than 0.05 mm. Reflector according to one of the preceding claims, characterized in that the reflection prisms extend substantially radially from the receptacle for the lighting means and are each rotated from one end to the other end between 1 ° and 20 °, preferably between 2 ° to 10 °. Reflector according to one of the preceding claims, characterized in that the reflector main body is formed substantially rotationally symmetrical and has an opening angle between 10 ° and 60 °, preferably between 30 ° and 50 °. Reflector according to one of the preceding claims, characterized in that the Recording for the bulb has a fit for precise adjustment of the bulb. Reflector according to one of the preceding claims, characterized in that the inner surface of the reflector main body is at least partially structured. Reflector according to one of the preceding claims, characterized in that at least partially light-collecting structures, in particular curved cylindrical lenses are arranged on the inner surface of the reflector main body. Reflector according to one of the preceding claims, characterized in that at least in sections a refractive structuring is arranged on the inner surface of the reflector main body. Reflector according to the preceding claim, characterized in that the refractive structuring is formed such that at least partially emitted by a light source beams are deflected in the direction of an axis perpendicular to the reflection prism axis. Reflector according to one of claims 1 to 12, characterized in that the inner surface of the reflector is at least partially smooth. Lighting device comprising a reflector according to one of the preceding claims and at least one lighting means. Lighting device according to the preceding claim, characterized in that the lighting means is adjusted and fixed in the reflector. Lighting device according to the preceding claim, characterized in that the lighting means is glued or cast in the reflector. Lighting device according to one of the preceding claims, characterized in that the reflector has a substantially rotationally symmetrical main body, which is provided with a, in particular UV radiation absorbing, cover plate. Lighting device according to one of the preceding claims, characterized in that the ratio of forward to backward emitted light is more than 1.5, preferably more than 1.8 and more preferably more than 2.2. Lighting device according to one of the preceding claims, characterized in that the lighting means is a halogen lamp. Use of a lighting device according to one of the preceding claims for a digital projector. Use of a lighting device according to one of the preceding claims for a motor vehicle, in particular for a vehicle headlight.

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