DE102006034324A1 - Reflector for motor vehicle, particularly vehicle headlights, has receiver for illuminant, where reflector has main body provided in sections with reflection prisms, and is designed symmetrically rotational, parabolic and elliptical - Google Patents

Abstract

The reflector (1) has a receiver for an illuminant (4), where the reflector has a main body (2) provided in sections with reflection prism (3). The main body is designed symmetrically rotational, parabolic and elliptical. The reflection prisms proceed radially from the receiver for the illuminant. The reflector is designed as single piece, and consists of a glass.

Description

Field of the invention

The 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 no. 554 562 a lamp bell for Street lamps, which is partially equipped with prism reflectors.

When A disadvantage of such prism reflectors has been found that These 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.

adversely On such prism reflectors is in particular that already small shifts of the bulb relative to the reflector a strong reduced efficiency may result.

Further Reflectors are known from practice, which instead of reflection prisms are provided with a reflective coating. Such a mirror coating is expensive and may tend to flake off. This tendency to flake off is especially due to high temperature load of the reflector with strong light sources, for example in digital projectors (beamers) and vehicles, reinforced.

Object of the invention

Of the Invention is in contrast the object of the invention to provide a reflector in which the mentioned disadvantages of the prior art can be reduced.

Especially The object of the invention is to provide a lighting device, which is provided with a prism reflector and improved Efficiency has.

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

Further It is an object of the invention to provide an easily replaceable combination to provide reflector and illuminant, which are both for pure lighting tasks as well as for Digital projectors can be used.

Summary of the invention

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

preferred embodiments and further developments of the invention are in the respective dependent claims remove.

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

By the integration of the recording for the bulb in the reflector will be good adjustment of the bulb reached. In addition, an easily replaceable combination of Bulb and reflector are provided, in which it is an easily replaceable unit, in particular also for digital projectors and halogen reflectors for indoor lighting suitable is.

To a preferred embodiment of Invention is the main body formed of the reflector substantially rotationally symmetrical.

Especially for digital Projectors is provided a parabolically ausgestalteter main body, which essentially produces a parallel light emission.

alternative can the main body be formed elliptical, thereby providing a spotlight can be.

Especially for lighting tasks in the interior but other designs are provided. there are reflectors with an opening angle between 10 ° and 60 ° provided.

The Reflection prisms run to achieve a good efficiency preferably substantially radially of the receptacle for the lighting means starting, that is the reflection prisms extend in a substantially star shape from a center of the reflector and run it simultaneously substantially tangential to the inner surface of the reflector main body.

at a preferred embodiment the invention, the reflector is integrally formed. So can the Reflector be provided, for example, as a glass press.

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

Of the Reflector main body preferably between 10 and 100, and more preferably between 20 and 25 reflection prisms. It turned out that with a number of about 30 reflection prisms in a reflector sets a particularly good efficiency with a halogen bulb.

Of the Reflector main body, which is preferably rotationally symmetrical, has a Diameter between 10 and 15 cm, preferably between 2 and 10 cm and more preferably between 3 and 6 cm.

It are in particular equipped with halogen bulbs reflectors with a Diameter of about 50 mm provided. The inventor has found out that even smaller reflectors than prism reflectors with acceptable Efficiency can be provided.

The Reflection prisms have an edge radius of less at the tip than 0.3 mm, preferably less than 0.1 mm, and more preferably less than 0.05 mm. Due to this small edge radius is reduces the efficiency of the reflector.

In Similarly, the edges at the transitions of individual reflection prisms with an edge radius of less than 0.3 mm, preferably less than 0.1 mm, and more preferably less than 0.05 mm.

at In a further development of the invention, the reflection prisms go in Essentially radially from the receptacle for the bulb and are each from one end to the other end between 1 and 20 °, preferably twisted between 2 and 10 °. The reflection prisms do not run exactly radiating, but it is intended to twist these in particular between 4 and 6 °. This embodiment leads to a more pleasing optical appearance of the reflector.

at a development of the invention has the inclusion of the light source a fit for precise adjustment of the bulb. In the fit it can be, for example, a cone or something similar. For the purpose of The invention is to be understood as a fit any means which Ensures that the bulb is in a defined position is used.

So is prevented when inserting the bulb or when Replacement of the light bulb, the position deviates from the target position, as in the prism reflector according to the invention the efficiency is due to an inaccurate adjustment of the bulb can deteriorate severely.

at a development of the invention is the inner surface of the Reflector main body at least partially structured. It is intended in particular the inner surface of the reflector main body with To provide facets.

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

Also a faceting, which is due to a refraction of the light source emitted light reaches that rays in the direction of a be bent perpendicular to the reflection prism axis, improves the efficiency of the reflector.

alternative can the inner surface of the reflector also be made smooth.

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

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

Especially The light bulb can be glued or poured.

By Such a configuration becomes a compact, interchangeable Illuminant provided, wherein the reflector together with the light bulb is exchanged.

Of the Reflector can, depending on the type of lamp used, with a provided in particular UV-absorbing cover panel become.

The Cover can also serve as splinter protection, in particular with digital projectors.

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

So there is a lighting device ready placed, which emits more than 2/3 of the light forward.

Preferably is used as a halogen bulb.

The Invention is particularly for digital projectors provided, in which bulbs with very high light output and associated mostly very high heat generation be used.

Further a use 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 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 ,

Around Achieving better efficiency can be achieved essentially from this tangential course also deviated sections (not darsgetellt).

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 provided with facets is. 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.

Of the Efficiency is further enhanced when the facets are formed as curved cylindrical lenses are.

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 it is understood that the invention is not intended to be a combination above limited characteristics is, but that the expert all mentioned features, where appropriate, will combine.

1

reflector

2

main body

3

reflection prism

4

admission for bulbs

5

axis of rotation

6

glass wall

7

fit

8th

cover plate

9

web

10

execution

11

lighting device

12

Lamp

13

top

14

Transition edge

Claims (26)

Reflector comprising at least one receptacle for at least a luminous means, wherein the reflector has a main body, which at least partially provided with reflection prisms is. Reflector according to the preceding claim, characterized characterized in that main body is formed substantially rotationally symmetrical. Reflector according to claim 2, characterized that main body is formed substantially parabolic. Reflector according to claim 2, characterized that main body is formed substantially elliptical. Reflector according to one of the preceding claims, characterized in that the reflection prisms are substantially radial from the recording for the bulb go out. Reflector according to one of the preceding claims, characterized characterized in that the reflector is integrally formed. Reflector according to one of the preceding claims, characterized characterized in that the reflector is made of glass. Reflector according to one of the preceding claims, characterized characterized in that the reflector main body is between 10 and 100, preferably between 20 and 50 reflective prisms. Reflector according to one of the preceding claims, characterized characterized in that the reflector main body has a diameter between 1 and 15 cm, preferably between 2 and 10 cm and particularly preferred between 3 and 6 cm. Reflector according to one of the preceding claims, characterized characterized in that the reflection prisms at least partially 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 have. Reflector according to one of the preceding claims, characterized in that the reflection prisms are substantially radial from the recording for the bulbs go out and from one end to the other End between 1 ° and 20 °, preferably between 2 ° to 10 ° twisted are. Reflector according to one of the preceding claims, characterized characterized in that the reflector main body is substantially rotationally symmetrical is formed and an opening angle between 10 ° and 60 °, preferably between 30 ° and 50 °. Reflector according to one of the preceding claims, characterized characterized in that the receptacle for the lighting means a fit For precise adjustment of the bulb has. Reflector according to one of the preceding claims, characterized characterized in that the inner surface of the reflector main body is structured at least in sections. Reflector according to one of the preceding claims, characterized characterized in that on the inner surface of the reflector main body at least partially light-collecting structures, in particular curved cylindrical lenses are arranged. Reflector according to one of the preceding claims, characterized characterized in that on the inner surface of the reflector main body at least a refractive structuring is arranged in sections. Reflector according to any one of the preceding claims, characterized in that the refractive structuring such is formed that at least partially from a light source outgoing rays in a direction perpendicular to the reflection prism be deflected axis running. Reflector according to one of claims 1 to 12, characterized that the inner surface the reflector is at least partially smooth. Lighting device comprising a reflector according to one of the preceding claims and at least one light source. Lighting device according to the preceding claim, characterized in that the lighting means adjusted in the reflector and is attached. Lighting device according to the preceding claim, characterized in that the lighting means glued in the reflector or poured in. Lighting device according to one of the preceding claims, characterized characterized in that the reflector has a substantially rotationally symmetrical main body having, which with a, in particular UV radiation absorbing, Cover is provided. Lighting device according to one of the preceding claims, characterized characterized in that the ratio from forward to backward emitted light 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 illuminant is a halogen lamp. Lamp for a digital projector, comprising a lighting device according to one of the preceding claims. Lamp for a motor vehicle, in particular vehicle headlights, comprising a lighting device according to any one of the preceding claims.