DE202017105788U1 - Illuminant for fulfilling at least one light function in a light color deviating from red through a red lens of a vehicle lamp and vehicle lamp with red lens and corresponding light source - Google Patents

Abstract

Light source (01) with at least one light source (02) for performing at least one light function in a red color light through a red lens (E), comprising: - at least one white light emitting LED (B) as the light source (02), and - At least one green color filter (C), which reduces the red portion of the at least one LED (B) emitted light.

Description

The invention relates to a luminous means for fulfilling at least one light function in a light color deviating from red behind a red lens of a vehicle lamp or through a red lens of a vehicle lamp according to the preamble of claim 1 and a vehicle lamp with red lens and corresponding lamp according to the preamble of the claim 7th

The invention report deals in particular with a realization of a reversing light function in conjunction with red-colored lens of a vehicle lamp.

A vehicle lamp comprises, for example, a luminaire interior substantially enclosed by a luminaire housing and a lens, and at least one light source accommodating at least one light source housed therein for at least one light function of the vehicle light.

Each vehicle lamp fulfills one or more tasks or functions depending on the design. To fulfill each task or function, a light function of the vehicle lamp is provided. Light functions, for example, in a configuration as a headlamp, a function illuminating the road, or in a configuration as a signal light, a signal function, such as a repeating flashing light function for driving direction indication, also called a direction indicator, FRA, or a brake light function for indicating a braking action, or e.g. a limiting light function, such as a taillight function, to ensure visibility of the vehicle during the day and / or night, such as in a taillight or daytime running light configuration. Examples of vehicle lights are the Fahrzeugbug, on the vehicle flanks and / or on the side mirrors arranged flashing lights, exit lights, such as ambient lighting, marker lights, brake lights, fog lamps, reversing lights, and typically high set third brake lights, so-called Central, High-Mounted Braking lights, daytime running lights, headlamps and fog lights used as turning or cornering lights, as well as combinations thereof.

Such a combination is realized, for example, regularly in the known taillights. These include, for example, repeating flashing lights, marker lights, brake lights, fog lights and reversing lights are used to name just one of many realized in tail lights combinations. Neither does this enumeration claim to be complete, nor does this mean that in a tail light all the aforementioned lights must be combined. Thus, for example, only two or three of the mentioned or else other lights in a common luminaire housing a tail light be combined.

Each light function of a vehicle lamp must fulfill an example prescribed by law light distribution. The light distribution sets at least to be observed, colloquially known as brightness luminous flux in at least to be observed solid angle ranges.

For the individual lighting functions, there are sometimes different brightnesses or visibility ranges and, in some cases, different light colors.

Due to their high efficiency in the conversion of electric current in visible to the human eye light come as light sources of bulbs for vehicle lights increasingly inorganic light emitting diodes or organic light emitting diodes used.

Inorganic light emitting diodes consist of at least one light emitting diode semiconductor chip, short LED chip, and at least one, for example, molded by injection molding, the at least one LED chip completely or partially enveloping primary optics. Vehicle lights are also known in which pure LED chips are used without molded primary optics.

Through Hole Technology (THT), Surface Mounted Device (SMD) LEDs, and LEDs are known in which the LED chip is bonded directly to the illuminant carrier in COB (Chip On Board) technology.

THT LEDs, THT LEDs for short, are a well-known type of inorganic light-emitting diodes. They are also referred to as leaded light-emitting diodes, since they consist of an at least in a desired emission transparent encapsulation, for example in the form of an encapsulation or a potting, which a the LED chip with a first electrical connection, for example in the form of an anode terminal connecting bonding wire and includes the LED chip connected to a second electrical connection, for example in the form of a cathode terminal. From the encapsulation protrude only the designated as little legs wires of the first electrical connection and the second electrical connection as the anode and cathode terminals of the THT-LED. The example as a cathode connection executed second electrical connection can in this case be provided with a cup mentioned above, in which the LED chip is arranged. The bonding wire leads from the example executed as an anode terminal first connection from outside the cup coming to the LED chip.

SMD LEDs, SMD LEDs for short, are another well-known type of inorganic light-emitting diode. SMD LEDs consist of a leadframe with at least one mounting surface for at least one LED chip and electrical connection surfaces. The leadframe is partially encapsulated by a plastic body with at least one recess freeing at least one mounting surface. The electrical connection surfaces of the leadframe are also kept free as the electrical connections of the SMD LED for later surface mounting. The at least one LED chip is arranged and electrically contacted at the bottom of the at least one recess extending to the at least one mounting surface. In this case, the LED chip is arranged on a first portion of the leadframe connected to at least one first electrical connection area. A bonding wire connects the LED chip to a second portion of the leadframe, which in turn is connected to at least one second electrical pad. The reaching at its base to the mounting surface recess may be designed reflector-like. The walls of the recess form the above-mentioned primary reflector. Here, the walls can be coated reflective.

COB LEDs, COB LEDs for short, consist of an unhoused LED chip and a bonding wire to be arranged directly on a light carrier. The back side of the LED chip forms the first electrical connection of the COB LED. For electrical contacting, the LED chip on its rear side is directly connected to a first conductor track of a luminous means carrier, e.g. electrically connected by soldering or welding. The bonding wire forming the second electrical connection of the COB LED is likewise connected to a second conductor track of the illuminant carrier, e.g. electrically connected by soldering or welding.

For the sake of completeness, it should additionally be mentioned that other contacts, such as the so-called flip-chip structure are possible, in which the contact means of the LED chip are connected directly to a contacted substrate. In these cases, no bonding wire is used.

In the following, therefore, for the sake of simplicity, no distinction is made between inorganic light-emitting diode and LED chip and instead the term LED is used uniformly for both, unless explicitly stated otherwise. Outstanding properties of LEDs compared to other, conventional light sources of bulbs are a much longer life and a significantly higher light output with the same power consumption. In other words, at the same light intensity, LEDs have lower power consumption compared to other light sources. In this way, when using one or more LEDS as the light source of a light source, for example, in a vehicle lamp, the load of a provided for power supply electrical system of a vehicle can be reduced, along with savings in energy consumption of the vehicle. Furthermore, LEDs have a much longer life than other, for use in a vehicle lamp candidate light sources. Due to the longer service life, among other things, the lower failure rate increases the operational safety and, concomitantly, the quality of the vehicle lamp.

An organic light-emitting diode (OLED) is a luminous thin-film component made of organic semiconducting materials with at least one emitter layer enclosed between electrically conductive, for example metallic layers for anode and cathode.

Unlike LEDs, OLEDs do not require single crystal materials. Compared to LEDs, OLEDs can therefore be produced using inexpensive thin-film technology. As a result, OLEDs make it possible to produce flat light sources which on the one hand have a very thin appearance and, on the other hand, have a particularly homogeneous appearance when used as a luminous surface visible through the lens of a vehicle lamp.

The lens of vehicle lights designed as tail lights is very often colored red. However, the summarized under the abbreviation RFS reversing light function, for example, a separate reversing light or a designated chamber designed as a rear light vehicle lamp requires in the prior art, however, a clear lens, because the emitted white light of the light source through a red lens only appears red. This colorless area in the lens is often problematic from the design point of view.

The yellow light of the direction indicator, also known as the FRA, is partially absorbed by a red colored lens. Here one often gets along with the fact that for the FRA a less red colored and often thinner window is built into the lens. This area does not have the desired one deep red of the remaining lens, but falls much less than a completely colorless window in the lens. For the RFS, this solution is not practical, because even a slight red coloration of the lens, the white light of the RFS colors too reddish.

In part, the RFS is also assembled with the FRA by placing additional white emitting LEDs next to the yellow FRA LEDs. Thus, the RFS need no own colorless area in the lens more. However, in this case, according to the prior art, the entire combination of FRA and RFS must have a colorless window in the lens.

Known are combinations of light sources with color filters, as well as combinations of spectral colors.

It is an object of the invention to provide a light source for fulfilling at least one light function in a light color deviating from red behind a red lens of a vehicle light or through a red lens of a vehicle light, and to provide a vehicle light with a red lens and corresponding light source.

The object is solved by the features of the independent claim. Advantageous embodiments are set forth in the claims, the drawings and the following description, including those associated with the drawing.

A first subject of the invention therefore relates to a luminous means for fulfilling at least one light function in a light color deviating from red behind a red lens of a vehicle lamp or through a red lens of a vehicle lamp.

The lighting means comprises at least one light source. As the light source, a white light emitting LED is provided.

The luminous means further comprises a green color filter, which reduces the red component of the light emitted by the LED.

In order to still obtain white light for the reversing light function despite red-colored lens, the invention therefore proposes a combination of a white light emitting LED and a green color filter, which reduces the red component of the light emitted by the LED.

The advantage here is that the color filter used has no influence on light emitting from yellow LEDs to fulfill a repetitive flash function emitted light.

As a result, one and the same of a red lens covered chamber of a vehicle lamp for the Wiederholblinklichtfunktion and for the reversing light function can be provided.

This allows a combination of direction indicator and reversing light with red lens, for example, within one and the same chamber of a lamp interior of a vehicle lamp.

The absorption of the green color filter, which is referred to as a green filter for short, is advantageously dimensioned such that, in combination with the red lens, subtractive color mixing results in at least approximately a neutral density filter, also referred to as a neutral filter. The transmittance, which results from the combination of green filter and the red lens, is therefore largely independent of wavelength in the visible spectral range. Thus, although the light of the white LEDs is weakened, its color location in the CIE color space (CIE - Commission Internationale de l'éclairage) is not or only slightly changed.

In this case, an LED is preferably used whose emission spectrum in the visible part of the electromagnetic spectrum advantageously has a pronounced maximum with a dimensionless, relative radiation intensity of 100% in a wavelength range between 420 nm and 440 nm and particularly preferably additionally in a wavelength range between 500 nm and 650nm an increased radiation with between 530nm to 580nm 35% up to 45%, preferably 38% to 42% of the maximum irradiance and with minima of at most 10%, preferably at most 7% of the maximum irradiance at wavelengths of about 400nm, 430nm and 700nm.

Advantageously, the color filter does not sit flat behind the lens, but directly on the or the white LEDs.

A second aspect of the invention relates to a vehicle lamp with a red lens and a previously described light source.

The vehicle lamp comprises, for example, a luminaire interior substantially enclosed by a luminaire housing and a red lens, and at least one light source accommodating at least one light source housed therein for at least one light function of the vehicle light.

It can be seen that the invention can be realized by a green color filter behind a red lens, to obtain a gray in transmission.

For example, an RFS can be incorporated into a FRA by placing additional white LEDs next to yellow LEDs for the FRA.

However, the color filter used for this does not sit flat behind the lens, but directly on the white LEDs.

The invention enables a combined light function of FRA and RFS with a red-colored lens. This eliminates the completely colorless area in the lens of a tail light. It is replaced by an area that has a slight red color and thus is visually less noticeable than a completely colorless area.

The lighting means may comprise individual or a combination of the features described above and / or below in connection with the vehicle lamp, just as the vehicle lamp may have and / or implement individual or a combination of a plurality of features previously and / or subsequently described in connection with the lighting means.

The illuminant and / or the vehicular lamp may alternatively or additionally be single or a combination of several in the context of the prior art and / or in one or more of the prior art documents and / or in the following description to those in the drawings having illustrated embodiments described features.

Additional, over the complete solution of the problem and / or on the above mentioned to the individual features mentioned advantages over the prior art are listed below.

The invention will be explained in more detail with reference to embodiments shown in the drawings. The proportions of the individual elements to one another in the figures do not always correspond to the actual size ratios, since some shapes are simplified and other shapes are shown enlarged in relation to other elements for better illustration. For identical or equivalent elements of the invention, identical reference numerals are used. Furthermore, for the sake of clarity, only reference symbols are shown in the individual figures, which are required for the description of the respective figure. The illustrated embodiments are merely examples of how the invention may be configured and are not an exhaustive limitation.

The only 1 shows a schematic representation of a arranged behind a red lens illuminant to meet at least one light function of a vehicle lamp in a deviating red color light through the red lens through in perspective view.

• – mindestens eine weißes Licht abstrahlende LED B als Lichtquelle 02, und
• – ein grünes Farbfilter C, welches den Rotanteil des von der mindestens einen LED B emittierten Lichts verringert.

An in 1 fully or partially illustrated bulbs 01 with at least one light source 02 to fulfill at least one light function in a light color deviating from red behind a red lens of a vehicle lamp or by a red lens 03 a vehicle lamp comprises:

• - At least one white light emitting LED B as a light source 02 , and
• A green color filter C, which reduces the red component of the light emitted by the at least one LED B.

In order to still obtain white light for the reversing light function RFS despite red-colored lens E, the invention accordingly proposes a combination of a white light emitting LED B and a green color filter C, which reduces the red component of the light emitted by the LED B.

The advantage of this is that the green color filter C used has no influence on light emitted by yellow LEDs F light to fulfill a designated briefly as FRA, also called direction indicator repeating flash function.

As a result, one and the same of a red lens E covered chamber of a vehicle lamp 100 for the FRA and for the RFS.

This allows a combination of FRA and RFS with red lens E, for example, within one and the same chamber of a lamp interior of a vehicle lamp 100 ,

Such a light source 01 can therefore be particularly advantageous in conjunction with a in 1 fully or partially illustrated vehicle light 100 with at least one lamp housing and a red lens E at least partially enclosed lamp interior and at least one housed therein, at least one light source 02 comprehensive light source 01 for at least one light function of the vehicle light 10 be used in a different color of red light color.

Such a vehicle light 100 may additionally have a repeat flash function (FRA).

It can be seen that the invention can be realized by a green color filter C behind a red lens E to obtain a gray in transmission.

To achieve the goal, a green color filter C is positioned directly in front of the white LEDs B ( 1 ).

The absorption of this green color filter C, which is referred to briefly as a green filter, is dimensioned such that, in combination with the red lens E, subtractive color mixing produces at least approximately a neutral density filter, also called a neutral filter. The transmittance, which results from the combination of green filter and the red lens E, is thus largely wavelength-independent in the visible spectral range. Thus, although the light of the white LEDs B is weakened, its color location in the CIE color space (CIE - Commission Internationale de l'éclairage) does not or only slightly changed.

In this case, an LED B is preferably used whose emission spectrum in the visible part of the electromagnetic spectrum advantageously has a pronounced maximum with a dimensionless, relative radiation intensity of 100% in a wavelength range between 420 nm and 440 nm and particularly preferably additionally in a wavelength range between 500 nm and 650nm an amplified radiation with between 530nm to 580nm 35% up to 45%, preferably 38% to 42% of the maximum irradiance and with minima of at most 10%, preferably at most 7% of the maximum irradiance at wavelengths of about 400nm, 430nm and 700nm.

The by the bulbs 01 realized light function preferably comprises a reversing light function, referred to as RFS for short, or is an RFS.

The green color filter C sits advantageously not flat behind the red lens E, but directly on the white or the white LEDs B.

For example, this may incorporate an RFS into a direction indicator, briefly referred to as FRA, by placing additional white LEDs B next to yellow LEDs F for the FRA.

However, the green color filter C used for this purpose does not sit flat behind the red lens E, but directly on the white LEDs B.

The invention enables a combined light function of FRA and RFS with a red-colored lens E. Thus, eliminating the completely colorless area in the lens of a tail light according to the prior art. It is replaced by an area having the same red coloration as the areas of red light color lighting functions, or at least a slight red coloration, and thus visually less noticeable than a completely colorless area of the prior art.

This technical solution to provide the RFS with a red colored lens E is also possible without assembly with the FRA, however, the assembly with the FRA offers the additional advantage that the RFS does not require additional space in the luminaire. Thus, it is possible to increase the luminous area of the FRA or other light function and thus increase their visibility through the larger illuminated area, reduce the glare by a lower luminance or save costs by installing weaker light LEDs. In the case of a "wiping" FRA, the additional space available due to the integration with the RFS offers a longer area for the animation, which increases the perceptibility of the animation direction. An assembly of RFS and FRA also offers safety-related advantages beyond design aspects.

In addition, when assembling FRA and RFS, the LEDs B, F required for both light functions can be placed close to each other on a board A. This may require fewer circuit boards and thus the cost of the vehicle light 100 lowered.

1 shows a structure with a reflector optics. At the focal point of the reflector D sits a yellow LED F, which is part of the FRA light function. Outside the focal point, an LED B is placed on the same board A, which emits white light. Directly in front of this LED B is a green color filter C realized by a transparent green plastic element as an optical filter. Both the yellow light of the FRA and the filtered light of the white LED B for the RFS pass through the red-transparent lens E from the vehicle lamp 100 out.

The light source 01 and / or the vehicle lamp may alternatively or additionally comprise single or a combination of several in the context of the prior art and / or in one or more of the documents mentioned in the prior art and / or features mentioned in the preceding description.

The invention is not limited by the description with reference to the embodiments. Rather, the invention encompasses any novel feature as well as any combination of features, including in particular any combination of features in the claims, even if that feature or combination itself is not explicitly stated in the claims or embodiments.

The invention is particularly industrially applicable in the field of manufacturing vehicle lights, in particular motor vehicle lights.

The invention has been described with reference to preferred embodiments. However, it will be apparent to those skilled in the art that modifications or changes may be made to the invention without departing from the scope of the following claims.

LIST OF REFERENCE NUMBERS

01

Lamp

02

light source

100

vehicle light

A

circuit board

B

white LED

C

green color filter

D

reflector

e

red lens

F

yellow LED

Claims (8)

Bulbs ( 01 ) with at least one light source ( 02 ) for performing at least one light function in a light color other than red through a red lens (E), comprising: - at least one white light emitting LED (B) as light source ( 02 ), and - at least one green color filter (C) which reduces the red component of the light emitted by the at least one LED (B).  Illuminant according to claim 1, wherein the absorption of the green color filter (C) is dimensioned so that at least approximately a gray filter results in combination with the red lens (E) by subtractive color mixing.  Illuminant according to claim 1 or 2, wherein the color filter (C) sits directly on the white LED (B).  Illuminant according to claim 1, 2 or 3, wherein an LED (B) is used, the emission spectrum in the visible to the human eye portion of the electromagnetic spectrum has a pronounced maximum with a dimensionless, relative radiation intensity of 100% in a wavelength range between 420nm and 440nm ,  Illuminant according to claim 4, wherein the LED (B) in a wavelength range between 500nm and 650nm amplified radiation with between 530nm to 580nm 35% up to 45% of the maximum irradiance and with minima of at most 10% of the maximum irradiance at wavelengths of about 400nm, 430nm and 700nm.  Illuminant according to one of the preceding claims, wherein the light function is a reverse light function (RFS). Vehicle light ( 100 ) with one of a luminaire housing and a red lens (E) at least partially enclosed lamp interior and at least one housed therein, at least one light source ( 02 ) bulbs ( 01 ) for at least one light function (RFS, FRA) in a light color deviating from red, comprising a light source ( 01 ) according to any one of the preceding claims.  Illuminant or vehicle lamp according to claim 7, wherein it additionally has a Wiederholblinklichtfunktion (FRA).

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