DE29620583U1 - Lighting fixture with continuously adjustable color change of the light and the light cone - Google Patents

Description

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K1377 27 November 1996

Applicant: KUNDISCH MICROTECH GmbH+ Co KG 78056 VS - Schwenningen

Description: Lighting fixture with continuously adjustable colour change of light and light cone

The invention relates to lighting fixtures with continuously adjustable color change of the light and electromotoric adjustment of the light cone, which are used to illuminate paintings or living rooms or workplaces.

Lighting fixtures are known as lamps, lights, floodlights, etc. They are used to brighten up dark rooms and objects and put them in the right light. Thanks to the possibility of precise light measurement, rooms and objects can now be illuminated very well.

Today, lighting technology offers a very large selection of light sources, e.g. light bulbs, fluorescent tubes, gas discharge lamps, LEDs, etc. The appropriate light source is selected and used depending on the application.

We speak of so-called warm light or cold light. The so-called warm light of the light bulb has more yellow-red components than the so-called cold light of the fluorescent tube.

The perceptions of the human eye vary greatly from person to person, so that the subjective impression of the light is ultimately rated as good or less good.

Today, color measurements are generally not carried out in lighting problems. The light source used once is as good as it is for the room or object to be illuminated and there is no possibility of color correction with equally bright light.

The fact that the color of the light cannot be changed results in further disadvantages. The emitted light is reflected by the illuminated room or objects in a different, often undesirable color.

When we talk about the color changes in light, we mean the changes (red, yellow, orange, green and/or blue) in nuances and not the bright color changes that are created by filters on light sources or by lasers in discotheques.

The lamps on the market today that allow the color of the light to be changed are mainly achieved by dimming the light sources, i.e. giving them less power. The light then changes color from white to yellow and red tints. The disadvantage is that the light becomes darker. The color can only be changed to yellow and red tints.

There are also light sources on the market that change color by changing the wavelength. These high-pressure gas lamps are very large and expensive, so they are not used in the home. The color range is also very limited.

It is also suggested to arrange a number, e.g. 50, of LEDs that have a high light brightness next to each other in an area and use them as a work lamp.

The majority of LEDs emit white light and only a few LEDs emit yellow, red, green or blue light.

If the colored LEDs are added to the white light, colored light is created.

The disadvantage of this proposal is easy to see. On the one hand, LEDs do not achieve the desired brightness of a spotlight with, for example, 40 watts. On the other hand, a large number of LEDs are arranged in one area in order to at least get a light that is approximately equivalent to the light of a 25 watt lamp. Since the LEDs are arranged in a larger area and the individual colored LEDs also radiate out of the area, this does not result in a homogeneous, colored light. In addition, a curved reflector cannot be installed in a small space.

The suggestion to use LEDs with their own color change has the major disadvantage that a color change is only possible from white to a yellow-red tone, i.e. not the entire color scale, and the brightness is, as already mentioned, very limited.

In summary, it can be stated that with the means of the state of the art to date there is no possibility of using a lighting fixture with any power consumption to homogeneously mix the color of white light with the colors red, orange, yellow, green or blue and their mixed colors, at a price that is appropriate for the domestic sector and insignificantly larger than the current designs.

The subject of the invention is a lighting fixture with continuously adjustable, homogeneous color change of the white light at high power consumption, e.g. 100 watts (and thus high

Brightness of the white light source) and electromotoric adjustment of the light cone.

According to the invention, this is achieved in the said lighting fixture by radiating colored light into the reflector from the lower edge of the reflector and, after reflection of this colored light beam in the reflector, mixing homogeneously with the white light and exiting at the front of the reflector as colored light (slightly tinted).

Due to the small size, LEDs with a small diameter are used to generate the colored light beam.

The lighting fixture according to the invention has various advantages.

Due to the radiation of the colored light from the lower edge of the reflector, the colored light beam is increasingly reflected towards the center of the reflector and emerges from the reflector as homogeneously mixed colored light in the usual beam direction of the light emitter. The brightness of the LEDs that emit the colored light is continuously regulated using a potentiometer.

It is best to arrange an odd number, e.g. 3 LEDs per color (e.g. red, orange, yellow, green and blue) near the lower edge of the reflector and the colored light from the LEDs is radiated directly or reflected into the reflector via a mirror or light guide in order to mix with the white light. Or, depending on the design of the reflector, the colored light sources can be inserted directly into the reflector.

The color light sources can be infinitely adjusted in brightness and can also be electronically mixed to any number of colors using an IC. 125

In addition, it is intended that the light source of the white light can be adjusted to the reflector by an electric motor and thus the angle of the beam of light can be increased or reduced.

130

With these lighting fixtures, the basic color of white light can be mixed remotely in any number of colors, homogeneously, more or less intensely, and the light cone can be remotely adjusted to requirements using a suitable wall switch.

The size will preferably not exceed the standard size of the spotlights or spots, or will only exceed it insignificantly. The price of such a lighting fixture is also only slightly higher for the end user compared to the white light spotlight.

This invention allows both the color of the light and the light cone to be continuously adjusted using a suitable rotary push-button switch (wall installation).

Now, with this inventive lighting fixture, not only the light for paintings but also for rooms or the light at the workplace can be adjusted in color and the angle of the light cone can be adjusted according to specific needs.

In the following, the invention is explained in more detail using an example and with reference to the accompanying drawings,

where,
Fig. 1 a section of the lighting fixture according to the invention

with lateral light irradiation. Fig. 2 shows the lighting fixture according to the invention in a top view.

Fig. 3 shows a further arrangement according to the invention in section with reflected light, wherein the LED carrier can also be designed as a light guide.

Fig. 4 shows a further example in section, in which the coloured light is radiated directly into the reflector.

Fig. 5 shows the lighting fixture according to the invention in section, showing the color change due to light irradiation and the change in the light cone due to an electric motor.

Fig. 6 shows a lighting fixture according to the invention in section, in which the coloured light is guided through a light guide

is reflected into the reflector. 175

Fig. 7 shows the lighting fixture according to the invention installed in a room, with the associated wall switch.

In Fig. 1, a lamp holder 1 is shown with the associated connecting wires 2 and the light bulb 3 (white light, e.g., 100 watts) with the reflector 4. At the lower edge of the reflector, according to the invention, there is a holder 5 for the LEDs 6, which according to the invention radiate the light beam S through the openings 8 obliquely upwards into the lower area of the reflector 4. The LEDs are here attached to a ring-shaped circuit board 7 with the

Soldering pads 9 are soldered on. The light beam S is reflected several times in the reflector 4 according to the dashed line, which, after mixing with the white light, leads to a homogeneous colored light when the light exits the reflector.

Fig. 2 shows the lighting fixture according to the invention in plan view. From above, the lamp holder 1 and the associated connecting wires 2 as well as the reflector 4 can be seen.

According to the invention, an odd number of LEDs 6 of each color are provided, here 3 per color, so that they always shine advantageously into the free space in the reflector 4. The LEDs are soldered onto the circuit board 7 via the soldering points 9. The connecting wires 28 of the circuit board 7 are for the connection to the switch and power supply. In this example, the LEDs in the colors: red, orange, yellow, green and blue are each arranged at a distance of 24°.

Fig. 3 shows another possible arrangement of the LEDs. The LEDs are arranged in the holder 11 and their colored light is radiated by the mirror surface 10 in the beam direction through the passage 8 provided at an angle upwards into the reflector 4.

Fig. 4 is another embodiment. Here, small tubes 12 are provided for accommodating the LEDs 6, which are incorporated directly into the reflector, whereby the lamp holder 1 with its connections 2, the bulb 3 with white light and the reflector 4 represent the output lamp.

Fig. 5 shows that in addition to the irradiation of colored light according to the invention, the reflector 4 to the light bulb 3 can also be adjusted using an electric motor 21.

This means that not only the color of the light but also the light cone of the lighting fixture can be changed.

The LEDs located in the holder 12 radiate their colored light through the openings 8 diagonally upwards into the reflector, are mirrored several times (see Fig. 1) and the light mixes with the white light to form a homogeneously mixed colored light.

The variable series resistor 20 ensures continuous variation of the brightness of the radiated colored light. The lamp holder 18 is firmly attached to the wall or housing with its connecting wires 2, as is the motor 21. If the eccentric 22 of the motor 21 is moved, the guide 23, which is firmly connected to the tube 19, is moved endlessly up or down. This changes the light bulb 3 to the focus (focal point) of the reflector 4 and thus also the light cone of the lamp. The motor is powered via the connecting wires 24 when the pressure switch 21 is operated.

In Fig. 6, the conventional reflector 4 is shown with the white light of the light bulb 3 and the socket 1 of the bulb and its connections 2. At the bottom edge, an LED 6 is shown in a light guide 25. Advantageously, only one LED per color is required in this design, since the colored light of the LED is guided into the ring-shaped part of the light guide around the reflector and is reflected on the mirror surface 26 in the direction of surface 27 and is then emitted into the reflector as a colored beam, as light beam S.

Fig. 7 shows the push-turn switch 13 as a built-in switch in the wall. The scale 15 on the switch 13 shows the color, which can be selected by setting it with the arrow 16. In addition to the colors: red, orange, yellow, green and blue, mixed colors, which are produced electronically by an IC, can also be selected.

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The lighting body 17 changes its light cone from an angle oil to the desired angle Jb electromotively by pressing the push button 14 on the switch 13.

Claims (8)

&Kgr;1377 27 November 1996 Protection claims: 1. Lighting fixture with a white light source with continuously adjustable color change of the light, characterized in that colored light is radiated or reflected laterally into the reflector 4 and the reflector 4 can be adjusted in the axial direction by an electric motor relative to the light bulb 3 and its holder 1. 2. Lighting fixture according to claim 1 and 2, characterized in that the light sources for the colored light are LEDs. 3. Lighting fixture according to claim 1, characterized in that the colored light is radiated or reflected into the reflector from the lower edge of the reflector 4 in a slightly upward direction. 4. Lighting fixture according to claim 1 to 3, characterized characterized in that the holder for the colour light sources is also designed as a light guide 25. 5. Lighting fixture according to claim 1 to 4, characterized in that an odd number of LEDs, preferably 3 per color, are arranged at equal distances on the reflector. 6. Lighting fixture according to claims 1 to 5, characterized in that the brightness of the LEDs is controlled with a potentiometer. 7. Lighting fixture according to claims 1 to 6, characterized in that different light intensities of the individual LEDs are achieved electronically with ICs. 8. Lighting body according to claims 1 to 7, characterized in that the reflector is displaced axially to the light source of the white light of the bulb 3 by an electric motor.