WO2025002994A1 - Source de lumière multispectrale et procédé - Google Patents

Source de lumière multispectrale et procédé Download PDF

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Publication number
WO2025002994A1
WO2025002994A1 PCT/EP2024/067381 EP2024067381W WO2025002994A1 WO 2025002994 A1 WO2025002994 A1 WO 2025002994A1 EP 2024067381 W EP2024067381 W EP 2024067381W WO 2025002994 A1 WO2025002994 A1 WO 2025002994A1
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WIPO (PCT)
Prior art keywords
light
light beam
light source
power component
wavelength
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Ceased
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PCT/EP2024/067381
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German (de)
English (en)
Inventor
Hannes Weise
Leon Fuchs
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Jenoptik Optical Systems GmbH
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Jenoptik Optical Systems GmbH
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Publication date
Application filed by Jenoptik Optical Systems GmbH filed Critical Jenoptik Optical Systems GmbH
Priority to CN202480043176.7A priority Critical patent/CN121443887A/zh
Publication of WO2025002994A1 publication Critical patent/WO2025002994A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/141—Beam splitting or combining systems operating by reflection only using dichroic mirrors
    • 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
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/20—Dichroic filters, i.e. devices operating on the principle of wave interference to pass specific ranges of wavelengths while cancelling others
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • 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
    • F21Y2113/00—Combination of light sources
    • F21Y2113/10—Combination of light sources of different colours

Definitions

  • the invention relates to a multispectral light source for generating an output radiation with several color channels with the features of independent patent claim 1 and to a method for generating a multispectral output radiation with the features of independent patent claim 11.
  • EP 3 193 503 A1 discloses an illumination system with three wavelength bands (color channels). Two wavelength bands have the same beam path and are alternately activated by means of a rotating disk with two different phosphor agents. This has the disadvantage that setting a specific coordinate in the color space or white balance is difficult to achieve.
  • a laser phosphor projector is known from EP 3 409 011 A1.
  • the disadvantage is the complicated structure.
  • US 8 608 329 A1 discloses an illumination system with a rotating disk with phosphor agents.
  • the disadvantage is the use of rotating parts in the beam path.
  • EP 2 530 520 A1 discloses an optical illumination system with a single primary light source. This has the disadvantage that setting a specific coordinate in the color space or white balance is difficult to achieve.
  • a light source is known from RU 51 734 U1 in which the light from three light emitting diodes is superimposed by means of two dichroic mirrors.
  • the achievable color rendering index may be too low for demanding applications.
  • a solid-state light source with dichroic reflectors is known from EP 1 024 539 A2.
  • the achievable color rendering index may be too low for applications with high requirements.
  • US 2018/0210213 A1 discloses a multispectral laser projector comprising three laser light sources with different wavelengths, a first beam splitter that combines the radiation from the first two light sources, and a second beam splitter that splits the radiation from the third light source and combines a partial beam thereof with the combined radiation from the first and second light sources to form an output beam.
  • the disadvantage is that the achievable color rendering index is rather low.
  • a multispectral light source is known from US 2012/0307514 A1, comprising three light emitting diodes with different wavelengths and two dichroic mirrors with which a common output beam is generated.
  • the achievable color rendering index may be too low for applications with high requirements.
  • another multispectral light source is known, comprising three light sources with different wavelengths, as well as a narrow-band, ie wavelength-dependent, polarization beam splitter and a dichroic mirror, with which a common output beam is generated.
  • the achievable color rendering index can also be too low for applications with high requirements.
  • the polarization beam splitter used can be expensive.
  • a first aspect of the invention is a multispectral light source for generating an output radiation.
  • the output radiation is a visible light beam.
  • This can comprise several, preferably at least three, spectral components.
  • the spectral components can each have different peak wavelengths and/or center wavelengths.
  • the individual spectral components can be generated using color channels, i.e. using the components of different wavelengths.
  • a color channel can be referred to as the part of the multispectral light source with which a spectral component of the output radiation is generated.
  • the multispectral light source comprises: a first light source, wherein a first light beam with a first wavelength can be emitted from the first light source, a second light source, wherein a second light beam with a second wavelength can be emitted from the second light source, and a third light source, wherein a third light beam can be emitted from the third light source, which has a wavelength range A3min to A3max.
  • the third light beam has a peak wavelength A3.
  • the wavelengths can each be determined as a peak wavelength.
  • the first and second light beam bundles can be narrowband, for example with a spectral width, which can be determined as the full width at half maximum (FWHM), of less than 100 nm, preferably less than 50 nm.
  • a narrowband light source can also be referred to as monochrome.
  • the third light beam can be broadband, for example with a spectral width (half-width FWHM) of more than 100 nm, preferably more than 200 nm. This can be white light, for example warm white, neutral white or cold white.
  • a bundle of light rays which can also be referred to as a light beam bundle, can be understood as a light radiation. This can run in a beam path in sections that are divergent or convergent or as parallel radiation (collimated).
  • a bundle of light rays can have a central ray that can represent the main direction of the bundle of light rays.
  • the first light source (first color channel), the second light source (second color channel) and the third light source (third color channel) are arranged at a distance from one another. They can therefore be individual light sources.
  • a first beam path of the first light beam and a second beam path of the second light beam and a third beam path of the third light beam can differ from one another in their course, at least in sections.
  • the multispectral light source comprises at least one first dichroic mirror for combining the first and second light beams to form a fourth light beam.
  • the fourth light beam can propagate in a direction z, as the direction of the central beam of the fourth light beam.
  • the first dichroic mirror is designed to reflect the second light beam and transmit the first light beam.
  • the second light beam can be incident on the first dichroic mirror in a direction y perpendicular to the direction z.
  • the first dichroic mirror can therefore be arranged in the first beam path and the second beam path in such a way that the second light beam can be reflected by the first dichroic mirror and the first light beam can be transmitted by the first dichroic mirror.
  • the fourth light beam can thus be formed from the transmitted first light beam and the reflected second light beam by spatially superimposing them. Due to the dichroic design of the mirror, the first and second light beams can be superimposed with almost no loss. This may mean that the fourth light beam contains more than 90%, advantageously more than 95%, of the first and second light beams.
  • the first dichroic mirror can be designed as a cube with an internal flat mirror layer.
  • the mirror layer can be delimited by two parallel surface diagonals and two edges of the cube.
  • the first dichroic mirror can also be designed as a plate-shaped mirror which has a mirror layer.
  • the plate-shaped mirror can be arranged at an angle of the plate normal of 45° to the first light beam and at an angle of 135° to the second light beam.
  • the first and second light beams can be arranged perpendicular to one another with regard to their central rays.
  • the mirror normal can lie in the plane spanned by the central rays of the first and second light beams and the plate plane or the mirror layer plane can form an angle bisector of these two central rays.
  • the mirror layer of the first dichroic mirror can, for example, be formed as a dichroic dielectric coating.
  • a beam splitter is provided downstream of the first dichroic mirror.
  • the beam splitter can be designed as a beam splitter cube with an internal flat mirror layer.
  • the mirror layer can be delimited by two parallel surface diagonals and two edges of the cube.
  • the beam splitter can also be designed as a plate-shaped mirror which has a mirror layer.
  • the plate-shaped mirror can be arranged at an angle of the plate normal of 45° to the fourth light beam and at an angle of 135° to the third light beam.
  • the third and fourth light beams can be arranged perpendicular to one another with regard to their central rays.
  • the mirror normal can lie in the plane spanned by the central rays of the third and fourth light beams and the plate plane can form an angle bisector of these two central rays.
  • the mirror layer of the beam splitter can be designed as a dielectric coating, for example.
  • the mirror layer of the beam splitter can be designed as a thin metal layer which is, for example, semi-permeable to the incident light.
  • the beam splitter can be non-polarizing, i.e. with a polarization-independent splitter ratio.
  • the beam splitter is designed to split the fourth light beam formed from the first light beam and the second light beam into a first power component and a second power component and to split the third light beam into a third power component and a fourth power component.
  • the beam splitter also allows the first power component to be superimposed on the fourth power component to form the output radiation.
  • the output radiation can therefore be understood as a spatial superposition of the first and fourth power components.
  • the second power component can be output together with the third power component as residual radiation or further output radiation.
  • the residual radiation can be discarded, for example, using an absorber or another beam trap if it is not required.
  • the second and third power components together can have the same radiation power as the first and fourth power components together.
  • Spatial superposition means that the superimposed beams of rays are located at the same point (location) and have the same direction of propagation.
  • the fourth light beam can be incident on the beam splitter in the direction z.
  • the third light beam can be incident on the beam splitter in the direction y.
  • the first power component and the fourth power component can leave the beam splitter in the direction z.
  • the second power component and the third power component can leave the beam splitter in the direction y.
  • the first power component and the fourth power component can be incident in the aforementioned directions of incidence. leave the beam splitter in the y direction and the second power component and the third power component leave the beam splitter in the z direction.
  • the beam splitter By means of the beam splitter, the power components of the fourth light beam formed from the first and second light beams and the power components of the third light beam can be divisible or reflected and transmitted independently of the wavelength, apart from a tolerance of the beam splitter. Therefore, the beam splitter can be understood as non-dichroic in the sense of the present invention.
  • the output radiation can be formed from the portion of the fourth beam transmitted through the beam splitter (first power component) and the portion of the third beam reflected by the beam splitter (fourth power component).
  • the output radiation can also be formed from the portion of the third beam transmitted through the beam splitter (fourth power component) and the portion of the fourth beam reflected by the beam splitter (first power component). This depends on the positioning of the beam splitter in the beam paths of the multispectral light source.
  • the beam splitter essentially divides the power components of the first, second and third light beams independently of the wavelength, an output radiation with a homogeneous power over the spectral range of the light beam can be generated, free of spectral power peaks and thus with particularly good color reproduction. It can be a continuous power spectrum with respect to the wavelength. This allows the white balance of the light source to be optimized so that the homogeneous output radiation can be generated.
  • the beam splitter is thus designed to generate a useful beam, i.e. the output radiation, and a residual beam.
  • the residual beam can be discarded if only one output radiation is required.
  • the residual beam can be used and thus represent a second output radiation.
  • the residual radiation can inevitably arise in this invention due to the wavelength independence of the beam splitter's splitting ratio.
  • the advantage of perfect color rendering of the multispectral light source can be associated with the disadvantage that part of the amount of light generated must be discarded as residual radiation.
  • the output radiation can ideally contain a light yield of 50% of the first, second and third light beams generated by the light sources. Due to the arrangement according to the invention and as a result of technical losses, the light yield of the output radiation can be 30% to 50% of the first, second and third light beams combined.
  • white light radiation with a high color rendering index can now be generated.
  • a color rendering index of Rf>92 can be generated.
  • the color rendering index can be determined according to the IES TM 30 -18 standard.
  • first beam path of the first light beam and the second beam path of the second light beam lie between the first dichroic mirror and the Beam splitters have a common first beam section, the first beam section having a first direction, for example z direction.
  • the fourth light beam can be understood as this first beam section.
  • the first beam path of the first light beam and the second beam path of the second light beam can be arranged locally superimposed.
  • the third light beam can be guided to the beam splitter on the third beam path in a second direction, for example y direction, the second direction differing from the first direction, in particular by 90°.
  • a second mirror is provided, wherein the second mirror is designed to reflect the first light beam, and wherein the second mirror is arranged in the first beam path such that the first light beam can be reflected by the second mirror before it strikes the first dichroic mirror.
  • the reflection can advantageously take place at a right angle.
  • the second mirror it is possible to freely choose the arrangement of the first light source for generating the first light beam, since it is now possible to redirect the first light beam by reflection.
  • This increases the flexibility of the arrangement of the individual light sources, so that the installation space of the multispectral light source can also be designed more flexibly without having to forego the generation of homogeneous output radiation with the high power density.
  • the first light source for providing the first light beam has a first luminous body and a first converter element, wherein a first primary light can be emitted from the first luminous body, and wherein the first light beam can be emitted from the first converter element by irradiation with the first primary light, wherein the second dichroic mirror is arranged in the first beam path between the first luminous body and the first converter element such that the first primary light can be transmitted through the second mirror and the first light beam can be reflected by the second mirror.
  • the second mirror can be designed to be dichroic, i.e., for example, transmitting for the wavelength of the primary light and reflecting for the first light beam.
  • the first converter element can be fluorescent and/or phosphorescent.
  • the first converter element can be a wavelength converter, which can also be referred to as a phosphor.
  • Phosphors are usually designed in such a way that the primary wavelength of the first primary light is smaller than the respective secondary wavelength of the first light beam. However, they can also be up-conversion elements which can convert a larger primary wavelength to smaller wavelengths, for example through multi-photon processes.
  • the first light beam emitted by the converter element can have a short coherence length of less than 1 mm and a spectral bandwidth (FWHM) of more than 30 nm.
  • FWHM spectral bandwidth
  • the second light source for providing the second light beam has a second luminous body and a second converter element, wherein a second primary light can be emitted from the second luminous body, and wherein the second light beam can be emitted from the second converter element by irradiation with the second primary light, wherein the first dichroic mirror is arranged in the second beam path between the second luminous body and the second converter element such that the second primary light can be transmitted and the second light beam can be reflected.
  • the second converter element can also be fluorescent and/or phosphorescent.
  • the second converter element can be a wavelength converter, which can also be referred to as a phosphor.
  • Phosphors are usually designed in such a way that the primary wavelength of the second primary light is smaller than the respective secondary wavelength of the second light beam. However, they can also be up-conversion elements which can convert a larger primary wavelength to smaller wavelengths, for example through multi-photon processes.
  • the second light beam emitted by the photoluminescent bodies can have a short coherence length of less than 1 mm and a spectral bandwidth (FWHM) of more than 30 nm.
  • the third light source for providing the third light beam has a third luminous body, a third converter element and a third dichroic mirror, wherein a third primary light can be emitted from the third luminous body, and wherein the third light beam can be emitted from the third converter element by irradiation with the third primary light, wherein the third dichroic mirror is arranged between the beam splitter and the third converter element such that the third primary light can be reflected and the third light beam can be transmitted.
  • the third converter element can also be fluorescent and/or phosphorescent.
  • the third converter element can be a wavelength converter, which can also be referred to as a phosphor.
  • Phosphors are usually designed in such a way that the primary wavelength of the third primary light is smaller than the respective secondary wavelength of the third light beam.
  • they can also be up-conversion elements which can, for example, convert a larger primary wavelength to smaller wavelengths using multi-photon processes.
  • the third light beam emitted by the photoluminescent bodies can have a short coherence length of less than 1 mm and a spectral bandwidth (FWHM) of more than 30 nm.
  • a first, second and/or third converter element it may be advantageous to design the associated first, second and/or third primary light source for generating the respective primary light as a laser diode. It is also conceivable that a wavelength filter is provided between the third light source, in particular a broadband third light source, and the beam splitter, wherein the wavelength filter is designed to filter a predetermined wavelength from the third light beam.
  • wavelength filters can be used if the wavelength range A3min to A3max of the third light source covers a very large range; the wavelength filter can then filter out spectral components which are not required to generate the output radiation or which are already covered by the first light beam or the second light beam.
  • the third light source can have an excessive peak in the blue wavelength range, which can then be eliminated using the filter.
  • the wavelength filter can advantageously be a blue filter. This can be a blocking filter for blue light.
  • the filter can be formed by means of dielectric interference layers and/or as an optical color filter made of colored glass.
  • first dichroic mirror and/or the second dichroic mirror may be designed as a short-pass mirror and/or the third dichroic mirror to be designed as a long-pass mirror.
  • the short-pass mirror refers to a mirror that is designed as a short-pass filter
  • the long-pass mirror refers to a mirror that is designed as a long-pass filter.
  • the characteristic feature of this filter option of the short-pass mirror or the long-pass mirror is the short transition between the pass and the stop region.
  • the wavelengths of the first light beam, the second light beam and the third light beam, which are superimposed to form the output radiation can be easily determined and reflected or transmitted by means of the respective dichroic mirrors in such a way that the superposition can be carried out without significant losses.
  • the beam splitter is designed to superimpose the first light beam, the second light beam with the first power component of the third light beam to form the output radiation in a ratio of 80:20 to 20:80, preferably 70:30 to 30:70, more preferably 60:40 to 40:60.
  • This can be effected in such a way that the fourth light beam, which is formed from the superimposed first and second light beams, arrives at a first input of the beam splitter and the first power component of this fourth light beam bundle with the fourth power component of the third light beam bundle arriving at a second beam splitter input is output into a useful beam beam splitter output.
  • the beam splitter can be designed to split the fourth light beam arriving in the first direction and formed from the first and second light beams in such a way that between 20% and 80% of the first and second light beams arriving on the first and second beam paths are superimposed in the first direction to form the output radiation. Furthermore, between 80% and 20% of the third light beam arriving in the second direction on the third beam path at the beam splitter can be redirected in the first direction to superimpose on the first and second beam paths.
  • losses of the first, second and third light beams of up to 5%, preferably up to 1%, can occur.
  • the second wavelength of the second light beam is greater than the third wavelength of the third light beam and that the third wavelength of the third light beam is greater than the first wavelength of the first light beam.
  • This sequence of wavelengths leads to an optimized behavior of the different lights or wavelengths, so that the final superimposed output radiation has a high light density with an optimized white balance.
  • first light source and/or the second light source and/or the third light source or the first luminous element and/or the second luminous element or the third luminous element are designed as a light-emitting diode or as a laser diode or as a light exit end of an optical fiber.
  • the first, second and/or third light source can be operated in continuous wave mode.
  • one, several or all of the light sources can be operated in pulsed mode.
  • the pulse length can be between 1 ns and 1000 ms, for example.
  • the light sources can be operated in synchronism or sequentially pulsed.
  • a collimating optic can be provided for collimating the first, second and third beams.
  • Collimating can be understood as converting a divergent beam, as emitted by the respective light source, into a parallel beam.
  • These collimating optics can be lens groups or individual lenses. They can be arranged in such a way that the beam paths (first beam path, second beam path and third beam path) on the first dichroic mirror and on the beam splitter, each have sections designed as collimated beams (parallel beams). This can be achieved by arranging the respective light source at the focal point of the associated lens group or individual lens. This can minimize color errors in the output radiation caused by a possible angular dispersion of the first dichroic mirror and/or the beam splitter.
  • a second aspect of the invention is a method for generating a multispectral output radiation, in particular a white light radiation with a high color rendering index, in particular Rf>92, with a multispectral light source, in particular a multispectral light source according to a first aspect of the invention, with the following steps:
  • the beam splitter is designed as a partially transparent mirror and has a splitting ratio of between 30:70 and 70:30, in particular a splitting ratio of 50:50, which is independent of wavelength up to a tolerance.
  • the splitting ratio can be defined as the ratio between transmitted and reflected light.
  • the splitting ratio can be the same for both beam splitter inputs.
  • the splitting ratio can be determined with respect to the power of the respective light beam bundles.
  • the fourth light beam can be fed to the first input of a beam splitter in a first direction.
  • the third light beam can be fed to the second input of the beam splitter in a second direction, which can be arranged perpendicular to the first direction.
  • the combination of the first power component with the fourth power component can also be described as superimposing these two power components.
  • These superimposed power components can form the fifth light beams and have the same location and direction in the fifth light beam.
  • a useful beam output can be provided to output the fifth light beam as output radiation.
  • the output radiation can be output as a parallel beam (collimated beam). It is also possible to focus the output radiation using a sixth individual lens or lens group, for example to output the output radiation into a waveguide, in particular an optical fiber.
  • the second power component and the third power component can be output to a residual beam output of the beam splitter.
  • This can be designed as a beam trap or an absorber that converts the residual radiation into heat.
  • the residual beam output can also be designed as a sensor. The sensor can be used to measure the light output, the color temperature and/or other parameters.
  • the residual beam output can also be designed as a photovoltaic generator in order to recover electrical energy from the residual radiation that is to be discarded.
  • the residual radiation can represent a superposition of the second and third power components. This can mean that these two power components are present together.
  • the divider ratio can have a tolerance.
  • the tolerance can be specified as a percentage value based on the sum of transmitted and reflected light.
  • the tolerance can manifest itself in the presence of a wavelength dependency within the tolerance range and/or a wavelength-independent deviation from the target value.
  • the tolerance of the divider ratio can be, for example, ⁇ 10%.
  • a planned divider ratio of 30:70 can be between 20:80 and 40:60 due to tolerances.
  • the output radiation can be focused onto a focal point and/or coupled into a waveguide, for example an optical fiber, by means of a focusing optic, for example a single lens or lens group, for example an achromat or apochromat.
  • a focusing optic for example a single lens or lens group, for example an achromat or apochromat.
  • the output radiation can be multi-mode.
  • the output radiation can be used advantageously to illuminate scenes for the purpose of color-accurate viewing and/or for recording images or videos. In particular, it can be used to illuminate handicraft items, especially jewelry items, as well as works of painting. In the context of visual quality control, for example of wallpaper or other printed products Color-true illumination with the output radiation can be advantageous.
  • the output radiation can also be used to illuminate microscopic objects for microscopy and photomicrography.
  • Figure 1 is a schematic representation of a first embodiment of a multispectral light source
  • Figure 2 is a schematic representation of the beam paths of the first embodiment of a multispectral light source
  • Figure 3 is a schematic representation of a modification of the first embodiment of a multispectral light source
  • Figure 4 is a schematic representation of a further modification of the first embodiment of a multispectral light source
  • Figure 5 is a schematic representation of a second embodiment of a multispectral light source
  • Figure 6 is a schematic representation of a third embodiment of a multispectral light source.
  • Figure 7 is a schematic representation of a method for generating an output radiation.
  • Fig. 1 to Fig. 4 show an embodiment of a multispectral light source 10 for generating an output radiation 12.
  • the multispectral light source 10 comprises a first light source 14, wherein a first light beam 16 with a first wavelength A1 can be emitted from the first light source 14, a second light source 18, wherein a second light beam 20 with a second wavelength A2 can be emitted from the second light source 18, and a third light source 22, wherein a third light beam 24 can be emitted from the third light source 22, which has a wavelength range A3min to A3max.
  • the first light source 14, the second light source 18 and the third light source 22 are arranged at a distance from one another, so that a first beam path 26 of the first light beam 16 and a second beam path 28 of the second light beam 20 and a third beam path 30 of the third light beam 24 differ from each other in their course at least in sections.
  • At least one first dichroic mirror 32 is provided, wherein the first dichroic mirror 32 is designed to reflect the second light beam 20 and transmit the first light beam 16, and wherein the first dichroic mirror 32 is arranged in the first beam path 26 and second beam path 28 such that the second light beam 20 can be reflected by the first dichroic mirror 32 and the first light beam 16 can be transmitted by the first dichroic mirror 32.
  • the first 16 and second 20 light beams are combined by means of the dichroic mirror to form a fourth light beam 76.
  • a beam splitter 34 is provided, which is arranged downstream of the first dichroic mirror 32.
  • the beam splitter 34 splits the fourth light beam 76, which is formed from the superimposed first light beam 16 and second light beam 20 and is incident on the beam splitter in the z direction, into a first power component 36 and a second power component 37.
  • the third light beam 30 is incident on the beam splitter 34 in the y direction.
  • the third light beam is split at the beam splitter into a third power component 38 and a fourth power component 39.
  • the first power component 36 can be superimposed on the fourth power component 39 by means of the beam splitter 34 to form the output radiation 12.
  • the combined first 36 and fourth 39 power components represent a fifth light beam bundle 82.
  • the second power component 37 and the third power component 38 can be superimposed on the beam splitter 34 to form the residual radiation 86.
  • a wavelength filter 62 is optionally provided between the third light source 22, which in this case is a broadband third light source 22, and the beam splitter 34.
  • This wavelength filter 62 filters a predetermined wavelength, here a shade of blue, from the third light beam 24. In a modification of the embodiments not shown in the figure, such a filter can be dispensed with.
  • the beam splitter 34 is designed to superimpose the first light beam 16, the second light beam 20 and the second power portion 37 of the third light beam 24 to form the output radiation 12 in a ratio of ideally 50:50.
  • the ratio can vary slightly within the spectral range of the output radiation due to the tolerance of the beam splitter, for example between 40:60 and 60:40.
  • a different splitter ratio can be provided.
  • the light sources of Figs. 1 to 3 are provided such that the second wavelength A2 of the second light beam 20 is greater than the third wavelength A3 (peak wavelength) of the third light beam 24 and that the third wavelength A3 (peak wavelength) of the third light beam 24 is greater than the first wavelength A1 of the first light beam 16.
  • the first embodiment is shown schematically in Figure 1.
  • the light beams are shown schematically as arrows.
  • the superimposed light beams are shown here as parallel arrows.
  • the central rays shown parallel to one another in the figure are each identically positioned on top of one another (see Figure 2).
  • the beam splitter 34 can be designed in the shape of a plate, as shown in Figure 1, or in an advantageous modification, as a beam splitter cube as shown in Figure 2.
  • the functional coating can be located on the side of the plate on which the second light beam 20 or the third light beam 30 arrives.
  • the output radiation can be bundled by means of a sixth lens 74 and output into an optical fiber 88.
  • the lens 74 can be a single lens or composed of several individual lenses in the sense of a lens group. It is advantageous to use an achromat.
  • the residual radiation 86 can be blocked by outputting it into a beam trap 90.
  • the beam trap 90 can be omitted and the residual radiation used as a further output radiation 84.
  • the further output radiation can represent a sixth beam bundle 86, which is formed from the union of the third 37 and fourth 38 power components.
  • the output radiation 12 and the residual radiation 36 are arranged in reverse order.
  • the optional focusing optics (sixth lens) would then have to be positioned accordingly in the modified output beam 12.
  • the residual radiation 86 is directed to a detector 92, with which parameters of the light, such as power or spectrum, can be determined.
  • a second mirror 40 is additionally provided.
  • the second mirror 40 is designed to reflect the first light beam 16. This allows the first light source 14, the second light source 18 and the third light source 22 to be arranged next to one another.
  • a second dichroic mirror 40 is additionally provided.
  • the second dichroic mirror 40 is designed to reflect the first light beam 16. This is arranged in the first beam path 26 such that the first light beam 16 can be reflected by the second dichroic mirror 40.
  • a third dichroic mirror 58 is also provided, which will be discussed further below.
  • the first dichroic mirror 32 of Figs. 1 to 4 is designed as a short-pass mirror.
  • the first light source 14, the second light source 18 and the third light source 22 are designed as a light-emitting diode.
  • a second exemplary embodiment of a multispectral light source 10 is shown schematically in Fig. 5.
  • the first light source 14 has a first luminous element 42 and a first converter element 44 for providing 110 the first light beam 16.
  • a first primary light 46 can be emitted from the first luminous element 42, and the first light beam 16 can be emitted from the first converter element 44 by irradiation with the first primary light 46.
  • the second mirror 40 is dichroic and is arranged in the first beam path 26 between the first luminous element 42 and the first converter element 44, the first primary light 46 being transmittable through the second dichroic mirror 40 and the first light beam 16 being reflected by the second dichroic mirror 40.
  • the second light source 18 has a second luminous body 48 and a second converter element 50 for providing the second light beam 20.
  • a second primary light 52 can be emitted from the second luminous body 48, so that the second light beam 20 can be emitted from the second converter element 50 by irradiation with the second primary light 52.
  • the first dichroic mirror 32 is arranged in the second beam path 28 between the second luminous body 48 and the second converter element 50 such that the second primary light 52 can be transmitted and the second light beam 20 can be reflected.
  • the third light source 22 is designed as a light-emitting diode.
  • a third exemplary embodiment of a multispectral light source 10 is shown schematically in Fig. 6.
  • the third light source 22 for providing 110 the third light beam 24 has a third luminous body 54, a third converter element 56 and the third dichroic mirror 58.
  • the third dichroic mirror 58 is designed as a long-pass mirror.
  • a third primary light 60 can be emitted from the third luminous element 54, and the third light beam 24 can be emitted from the third converter element 56 by irradiation with the third primary light 60.
  • the third dichroic mirror 58 is arranged between the beam splitter 34 and the third converter element 56 in such a way that the third primary light 60 can be reflected and the third light beam 24 can be transmitted.
  • the multispectral light source 10 has laser diodes as the first light source 42, the second light source 48 and the third light source 54. Alternatively, individual or all light sources can be designed as light-emitting diodes. 1 to 4, the first beam path 26 comprises a first collimation optics 64 with the first lens 64, the second beam path 37 comprises a second collimation optics 66 with the second lens 66, and the third beam path 30 comprises a third collimation optics 68 with the third lens 68.
  • the components referred to as lenses can each be a single lens or composed of several individual lenses in the sense of a lens group. For example, achromats can be used, which can be composed of two cemented lenses. In Figs.
  • the first lens 64 is arranged between the first light source 14 and the first dichroic mirror 32, and in Fig. 4 between the first light source 14 and the second mirror 40.
  • the second lens 66 is arranged between the second light source 18 and the first dichroic mirror 32, and the third lens 68 is arranged between the third light source 22 and the beam splitter 34.
  • the beam paths (first beam path 26, second beam path 28 and third beam path 30) on the first dichroic mirror and on the beam splitter each have sections designed as collimated beam bundles (parallel beam bundles).
  • color errors of the output radiation 12 due to a possible angular dispersion of the first dichroic mirror 32 and/or the beam splitter 34 can be minimized.
  • a first imaging optics 64, 70 of the first beam path 26 has a fourth lens 70, which is arranged between the light source 14, 42 and the second dichroic mirror 40, and a first lens 64, which is arranged between the first converter element 44 and the second dichroic mirror 40.
  • the multispectral light source 10 has a third lens 68 and a seventh lens 75 in the second imaging optics.
  • a fifth lens 72 is arranged between the light source 18, 48 and the first dichroic mirror 32 and the second lens 66 is arranged between the first dichroic mirror 32 and the second converter element 50.
  • the third imaging optics 68, 75 of the third embodiment in Fig. 6 also has a seventh lens 75 between the illuminant 22, 54 and the third dichroic mirror 58 and the third lens 68 between the third dichroic mirror 58 and the third converter element 56.
  • the first imaging optics 64, 70 are used to image the first luminous element 42 onto the first converter element 44. They have the first lens 64 in common with the first collimation optics.
  • the second imaging optics 66, 72 are used to image the second luminous element 48 onto the second converter element 50. They have the second lens 66 in common with the second collimation optics.
  • the third imaging optics 68, 75 are used to image the third luminous element 54 onto the third converter element 56. They have the third lens 68 in common with the third collimation optics.
  • Fig. 7 shows the method 100 for generating a multispectral output radiation 12, in particular a white light radiation with a high color rendering index, in particular Rf>92, with a multispectral light source 10 according to one of Figs. 1 to 3.
  • the method 100 comprises the following steps: a. Providing 110 a first light beam 16 with a first wavelength A1, b. Providing 110 a second light beam 20 with a second wavelength A2, c. Providing 110 a third light beam 24 which has a wavelength range A3min to A3max with a peak wavelength A3, d. Combining 120 the first light beam 16 with the second light beam 20 by means of a first dichroic mirror 32 to form a fourth light beam 76, e. Feeding 130 the fourth light beam 76 to the beam splitter 34 in a first direction 78, f. Feeding 130 the third light beam 24 to the beam splitter 34 in a second direction 80, g.
  • the beam splitter 34 is designed as a partially transparent mirror and has a wavelength-independent splitting ratio (ratio between transmitted and reflected light) between 30:70 and 70:30, in particular a splitting ratio of 50:50, up to a tolerance of +-10%.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Lasers (AREA)

Abstract

L'invention concerne une source de lumière multispectrale (10) pour produire un rayonnement sortant (12), ladite source de lumière multispectrale comprenant : - une première source de lumière (14), un premier faisceau de lumière (16) ayant une première longueur d'onde (λ1) pouvant être émis par la première source de lumière (14), - une deuxième source de lumière (18), un deuxième faisceau de lumière (20) ayant une deuxième longueur d'onde (λ2) pouvant être émis par la deuxième source de lumière (18), - une troisième source de lumière (22), un troisième faisceau de lumière (24), qui a une plage de longueurs d'onde de λ3min à λ3max, pouvant être émis par la troisième source de lumière (22), dans lequel la première source de lumière (14), la deuxième source de lumière (18) et la troisième source de lumière (22) sont agencées à une certaine distance les unes des autres, - au moins un premier miroir dichroïque (32) pour combiner le premier faisceau de lumière (16) et le deuxième faisceau de lumière (20) en un quatrième faisceau de lumière (76), le premier miroir dichroïque (32) étant conçu pour réfléchir le deuxième faisceau de lumière (20) et transmettre le premier faisceau de lumière (16), et premier miroir dichroïque (32) étant agencé de telle sorte que le second faisceau de lumière (20) peut être réfléchi par le premier miroir dichroïque (32) et le premier faisceau de lumière (16) peut être transmis par le premier miroir dichroïque (32), et - un diviseur de faisceau (34) positionné en aval du premier miroir dichroïque (32), le diviseur de faisceau (34) étant conçu pour diviser le quatrième faisceau lumineux (76), formé à partir du premier faisceau lumineux (16) et du second faisceau lumineux (20), en un premier composant de puissance (36) et un second composant de puissance (37), et pour diviser le troisième faisceau de lumière (24) en un troisième composant de puissance (38) et un quatrième composant de puissance (39), le premier composant de puissance (36) pouvant être superposé sur le quatrième composant de puissance (39) par le diviseur de faisceau (34) afin de former le rayonnement de sortie (12), et le second composant de puissance (37), conjointement avec le troisième composant de puissance (38), pouvant être délivré sous la forme d'un rayonnement résiduel (86) ou d'un rayonnement sortant supplémentaire (86).
PCT/EP2024/067381 2023-06-27 2024-06-21 Source de lumière multispectrale et procédé Ceased WO2025002994A1 (fr)

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CN202480043176.7A CN121443887A (zh) 2023-06-27 2024-06-21 多光谱光源和方法

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DE102023116945.9 2023-06-27
DE102023116945.9A DE102023116945B3 (de) 2023-06-27 2023-06-27 Multispektrale Lichtquelle und Verfahren

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EP1949082B1 (fr) * 2005-11-14 2020-03-11 Carl Zeiss Microscopy GmbH Dispositif d éclairage multispectral
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EP3719481A2 (fr) * 2015-02-06 2020-10-07 Life Technologies Corporation Un instrument optique pour l'analyse biologique
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Publication number Priority date Publication date Assignee Title
EP1024539A2 (fr) 1999-01-29 2000-08-02 Hewlett-Packard Company Source d illumination à l état solide utilisant des reflecteurs dichroiques
RU51734U1 (ru) 2005-10-14 2006-02-27 Общество с Ограниченной Ответственностью "ЛОМО ФОТОНИКА" Осветитель
EP1949082B1 (fr) * 2005-11-14 2020-03-11 Carl Zeiss Microscopy GmbH Dispositif d éclairage multispectral
US20120307514A1 (en) 2007-08-06 2012-12-06 Lumencor, Inc. Light emitting diode illumination system
US20090231549A1 (en) * 2008-03-14 2009-09-17 Young Optics Inc. Beam combining device and projector having such beam combining device
EP2530520A1 (fr) 2010-01-29 2012-12-05 NEC Display Solutions, Ltd. Système optique d'éclairage et projecteur utilisant celui-ci
US8608329B2 (en) 2010-08-16 2013-12-17 Delta Electronics, Inc. Phosphor plate and illumination system with the same
EP3193503A1 (fr) 2011-09-22 2017-07-19 Delta Electronics, Inc. Dispositif au phosphore et système d'éclairage et appareil de projection le comprenant
CN103974046A (zh) * 2014-04-14 2014-08-06 湖州清维电子科技有限公司 一种激光激发连续白光投影系统及投影方法
EP3719481A2 (fr) * 2015-02-06 2020-10-07 Life Technologies Corporation Un instrument optique pour l'analyse biologique
EP3409011A1 (fr) 2016-01-26 2018-12-05 Barco N.V. Commande de couleurs primaires et de point blanc dans un projecteur à laser-luminophore
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CN111399241A (zh) 2020-03-07 2020-07-10 赫尔曼·友瀚·范·贝赫库姆 一种发光装置
DE202020005883U1 (de) * 2020-11-25 2023-01-30 Jenoptik Optical Systems Gmbh Vorrichtung zum Erzeugen von Licht

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