EP3268660A1 - Apparatus, system and method for converting monochromatic light into polychromatic light - Google Patents
Apparatus, system and method for converting monochromatic light into polychromatic lightInfo
- Publication number
- EP3268660A1 EP3268660A1 EP16711541.9A EP16711541A EP3268660A1 EP 3268660 A1 EP3268660 A1 EP 3268660A1 EP 16711541 A EP16711541 A EP 16711541A EP 3268660 A1 EP3268660 A1 EP 3268660A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- conversion element
- plane
- polychromatic
- monochromatic light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/02—Combinations of only two kinds of elements
- F21V13/08—Combinations of only two kinds of elements the elements being filters or photoluminescent elements and reflectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/002—Refractors for light sources using microoptical elements for redirecting or diffusing light
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
- F21V5/048—Refractors for light sources of lens shape the lens being a simple lens adapted to cooperate with a point-like source for emitting mainly in one direction and having an axis coincident with the main light transmission direction, e.g. convergent or divergent lenses, plano-concave or plano-convex lenses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/30—Semiconductor lasers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0087—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for illuminating phosphorescent or fluorescent materials, e.g. using optical arrangements specifically adapted for guiding or shaping laser beams illuminating these materials
Definitions
- the present invention relates to an apparatus and a method for converting monochromatic light into polychromatic light.
- This type of device is needed for lighting purposes of any kind where the light source has a more limited waveband than the desired light to be delivered. This is especially the case with automotive headlamps.
- a light source which emits monochromatic light, that is to say light with a very limited wavelength range
- the conversion element includes a chemical element or compound that converts the irradiated monochromatic light into polychromatic light having a wider wavelength range.
- phosphorus is known as a chemical element. Since the light source is thus located away from the conversion element, this type of conversion is known as a "remote phosphor" method, as shown, inter alia, in DE 10 2012 223 854 A1 and DE 10 2012 223 857 A1.
- monochromatic light is irradiated onto the conversion element, which changes the wavelength range of the monochromatic light so as to produce polychromatic light, for example white light.
- conversion elements act as Lambertian radiators and emit the converted light uniformly in all spatial directions after diffuse reflection or transmission.
- a radiation characteristic as is the case with the Lambertian radiator and in which the light is distributed in a flat representation over 180 ° in the shape of a circle, is disadvantageous, since only a limited angular range is captured by a following optical system can be harnessed thereby.
- a different radiation characteristic than the Lambertian is desirable.
- the device for converting monochromatic light into polychromatic light uses at least one conversion element which can convert the monochromatic light into polychromatic light.
- conversion elements which have chemical constituents by which the wavelength range of the light can be changed such that the irradiated light has a different wavelength range or a different resulting dominant wavelength than the emitted light.
- the wavelength range is widened. That is, the converted and radiated light has a larger wavelength range than the irradiated light.
- monochromatic light can be converted into white light, for example.
- the conversion element is flat and usually disc-shaped.
- the conversion element can, however, in addition to a disc-shaped, that is circular, shape also occur in other Gestaitungsformen and be, for example, angular. Due to the planar design, the conversion element has two sides, or two surfaces, which act as Einstrahlebene and as Abstrahlebene.
- the monochromatic light first comes into contact with the irradiation plane, that is to say with the first surface in the direction of the light. If the monochromatic light is radiated again from the last surface of the conversion element in the light direction and converted as it passes through the conversion element, there is a transmissive conversion element.
- the irradiation plane and the abstraction plane represent the same plane and thus the same side of the planar conversion element.
- the side from which the monochromatic light is irradiated and the side from which the converted polychromatic light leaves the conversion element are the same.
- the conversion element is preferably mounted on a holder which reflects the light as best as possible.
- the chemical constituents to which the light in the conversion element converts may, for example, consist of phosphorus, since this is known to be suitable for converting the wavelength of the incident light.
- chemical elements and compounds from the field of rare earths are conceivable, in particular cerium.
- the conversion element is provided with at least one structure on the Einstrahlebene and / or the Abstrahlebene, which, according to the object of the present invention, the radiation characteristic of the emitted polychromatic light over the Abstrahi futurizing a flat surface changes.
- This change in the emission characteristic achieves a narrowing of the emission angle range and / or an increase in the radiation intensity or radiance of the emitted light in a preferred light direction.
- the limitation of the Abstrahlwinkel Schemes causes no longer, as in a Lambert'schen Strahier in the planar representation, the light is emitted over 180 °, but the Abstrahlwinkel Scheme is limited, for example, to 120 ° +/- 40 °.
- the above-mentioned structure may be spherical-concave or spherical-convex. This means that the surface of the Abstrahlebene and / or Einstrahlebene a spherical-concave or spherical-convex designed professional! having. Likewise, it is possible to provide not only spherical, but also aspherical, pyramidal and / or lattice-shaped profiles as structures. Another method to change the surface of the Abstrahlebene targeted, it is to provide a micro-roughness.
- the Abstrahicharaktenstik the radiated polychromatic light is changed, so that either the Abstrahlwinkel Scheme of the emitted light in comparison to Lamber rule emitters is limited and / or the radiant intensity or the radiance of the emitted light is increased in a preferred light direction.
- a targeted beam shaping of the emitted light can be achieved. This targeted beam shaping can be achieved by the structures applied to the conversion element due to the physical laws of optics in conjunction with the effects of radiation conversion.
- the directional reflection of the incident laser beam can be reduced.
- the surface of the Einstrahl- and / or Abstrahlebene is roughened in the micrometer range. This results in a complete conversion of the incident monochromatic light in emitted polychromatic light.
- the abovementioned structures are introduced into the conversion element by a short-pulse laser.
- the conversion element it is therefore necessary for the conversion element to comprise a thermally loadable material that can be processed by the short-pulse laser.
- ceramic conversion elements have proven to be particularly advantageous, preferably a ceramic single crystal (for example, an yttrium-aluminum garnet).
- the chemical materials used to convert the light may then be embedded in this material or applied to the surface. Of course, if they are applied to the surface, this must be done after processing with the short pulse laser.
- the surface structure a combination of the above-mentioned spherical, aspherical, pyramidal and rough structures may also be used.
- the grid has a grid line spacing of 20 ⁇ to 100 ⁇ .
- the irradiation monochromatic light with the wavelength 420 nm to 480 nm is used, which is converted by the conversion element in polychromatic light, preferably with a color temperature of 3500 K to 6500 K.
- the coloring, or color temperature, as well as the wavelength range of the light emitted by the conversion element results from the thickness of the conversion element, that is, the optical path that the irradiated monochromatic light has to take through the material of the conversion element. Since material is partially removed from the conversion element as a result of the processing for introducing the structure into the conversion element, it should be ensured that the conversion element has the desired thickness for the desired color temperature at its thinnest point. Preferably, these are 0.2 mm to 1 mm.
- a light source that emits monochromatic light.
- These may be semiconductor light sources, such as LED or laser diodes, or commercially available lasers.
- monochromatic light is now irradiated to the Einstrhiebene a device according to the invention.
- the irradiated monochromatic light is, as described above, converted by the conversion element, or by the chemical elements and / or chemical compounds to polychromatic light. This has a larger wavelength range than the incident light.
- the converted polychromatic light is emitted at the radiation level, wherein the emission characteristic with respect to a plane surface changes due to the structure on the single-beam plane and / or the emission plane in such a way that the emission characteristic is no longer to be assigned to a Lambertian emitter, but the emission angle range is limited and / or the radiance or radiant intensity of the radiated light increases in a preferred light direction.
- the emission characteristic of the emitted light is optimized in accordance with a subsequent optical system, thereby achieving a higher efficiency in the further processing, as is the case with a Lambertian radiation characteristic.
- FIG. 1 shows a reflective conversion element with a concave, aspherical structure
- Figure 2 shows a transmissive conversion element with convex, spherical structure
- FIG. 1 shows a reflective conversion element 2 with a concave aspherical structure.
- the irradiated monochromatic light 1 is hereby irradiated on the same side of the conversion element 2 as the emitted polychromatic light 5 is emitted.
- the Einstrahlebene 3 is equal to the Abstrahlebene 4.
- As a structure in the Abstrahlebene 4 and the Einstrahlebene 3 of the conversion element 2 is a concave, aspherical area introduced.
- the conversion element 2, since it is configured as a reflective conversion element 2, should be applied to an opaque holder 5.
- the application is made by the Einstrahlebene 3 opposite side. As a result, the incident light 1 is reflected as best as possible.
- the radiated light 5 has a limited range of radiation radiation. If there were no structure, ie the conversion element flat, the emitted light 5 would have a radiation characteristic of a Lambertian radiator.
- FIG. 2 shows a transmissive conversion element 2, that is to say a conversion element 2, in which the irradiation plane 3 to which the irradiated monochromatic light 1 strikes is a different plane than the emission plane 4 at which the emitted light 5 is emitted.
- the irradiation plane 4 in the light direction is the first surface onto which the irradiated monochromatic light strikes, and the abstraction plane 3 the last surface from which the emitted poiychromatic light emerges.
- a convex-spherical structure is applied to also change the radiation characteristic of the emitted polychromatic light 5. Again, it can be clearly seen that the polychromatic light has a limited radiation angle range 6.
- the monochromatic light 1 has its origin each in a light source, not shown, which may be a Halbleiterüchtán, such as an LED or laser diode or a commercially available laser.
- a light source not shown, which may be a Halbleiterüchtán, such as an LED or laser diode or a commercially available laser.
- a plurality of such conversion elements 2 can be combined, through which the irradiated monochromatic light 1 is then passed through the combination of the conversion elements 2. This allows more accurate modified radiation characteristics are possible.
- FIG. 3 shows possible emission characteristics by the emitted polychromatic light 5.
- the respective emission plane 4 is shown, which has a limited emission angle range compared to a Lambertian emitter and increases the beam density 10 or the beam intensity 11.
- the increase in the beam density 10 is shown, which is associated with the limitation of the Abstrahlwinkel Schemes.
- the distribution of the beam intensity 1 1 is shown, which is also increased by the change in the radiation characteristic.
- the polychromatic, radiated light is designed as a diffuse radiator with a preferred direction.
- the present invention is not limited to the above-mentioned features. Rather, further embodiments are conceivable.
- the short-pulse laser can be designed as a femtosecond laser or the wavelength of the irradiated monochromatic light have a different wavelength.
- non-visible wavelengths of electromagnetic radiation are conceivable as monochromatic light.
- the invention is applicable as a light source, inter alia, for video projection systems, for headlights and in particular in vehicle lighting and lighting devices. LIST OF REFERENCE NUMBERS
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015103696.7A DE102015103696A1 (en) | 2015-03-13 | 2015-03-13 | Apparatus and system and method for converting monochromatic light into polychromatic light |
PCT/EP2016/054938 WO2016146440A1 (en) | 2015-03-13 | 2016-03-08 | Apparatus, system and method for converting monochromatic light into polychromatic light |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3268660A1 true EP3268660A1 (en) | 2018-01-17 |
Family
ID=55589803
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16711541.9A Withdrawn EP3268660A1 (en) | 2015-03-13 | 2016-03-08 | Apparatus, system and method for converting monochromatic light into polychromatic light |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3268660A1 (en) |
DE (1) | DE102015103696A1 (en) |
WO (1) | WO2016146440A1 (en) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10539311B2 (en) * | 2008-04-14 | 2020-01-21 | Digital Lumens Incorporated | Sensor-based lighting methods, apparatus, and systems |
DE102010063779A1 (en) * | 2010-12-21 | 2012-06-21 | Osram Ag | lighting arrangement |
JP5788194B2 (en) * | 2011-03-03 | 2015-09-30 | シャープ株式会社 | Light emitting device, lighting device, and vehicle headlamp |
JP2012243624A (en) * | 2011-05-20 | 2012-12-10 | Stanley Electric Co Ltd | Light source device and lighting device |
DE102011081919A1 (en) * | 2011-08-31 | 2013-02-28 | Automotive Lighting Reutlingen Gmbh | Light module for use in headlight of motor car, has wavelength converter arranged separately from LED at predetermined distance from beam-forming elements, where converter is provided in optical path of blue colored light emitted by LED |
JP5995541B2 (en) * | 2012-06-08 | 2016-09-21 | Idec株式会社 | Light source device and lighting device |
DE102012223857A1 (en) | 2012-12-19 | 2014-06-26 | Osram Gmbh | Laser activated remote phosphorus lighting device e.g. light, for use as e.g. headlight, has return beam mirror arranged apart from main direction of secondary light and arranged such that primary light portion is guided on converter region |
DE102012223854A1 (en) | 2012-12-19 | 2014-06-26 | Osram Gmbh | Remote phosphor converter device |
DE102012112994A1 (en) * | 2012-12-21 | 2014-06-26 | Osram Opto Semiconductors Gmbh | headlamp device |
WO2014119783A1 (en) * | 2013-02-04 | 2014-08-07 | ウシオ電機株式会社 | Fluorescent-light-source device |
-
2015
- 2015-03-13 DE DE102015103696.7A patent/DE102015103696A1/en not_active Ceased
-
2016
- 2016-03-08 WO PCT/EP2016/054938 patent/WO2016146440A1/en active Application Filing
- 2016-03-08 EP EP16711541.9A patent/EP3268660A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
DE102015103696A1 (en) | 2016-09-15 |
WO2016146440A1 (en) | 2016-09-22 |
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Ipc: F21V 5/00 20180101ALI20160929BHEP Ipc: F21V 9/16 20181130ALI20160929BHEP Ipc: F21K 99/00 20160101AFI20160929BHEP Ipc: F21Y 115/30 20160101ALI20160929BHEP Ipc: F21V 5/04 20060101ALI20160929BHEP |
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Ipc: F21V 5/04 20060101ALI20160929BHEP Ipc: F21K 99/00 20160101AFI20160929BHEP Ipc: F21V 9/16 20060101ALI20160929BHEP Ipc: F21V 5/00 20180101ALI20160929BHEP Ipc: F21Y 115/30 20160101ALI20160929BHEP |
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