DE102005022260A1 - Device for combining light of different wavelengths - Google Patents

Device for combining light of different wavelengths Download PDF

Info

Publication number
DE102005022260A1
DE102005022260A1 DE102005022260A DE102005022260A DE102005022260A1 DE 102005022260 A1 DE102005022260 A1 DE 102005022260A1 DE 102005022260 A DE102005022260 A DE 102005022260A DE 102005022260 A DE102005022260 A DE 102005022260A DE 102005022260 A1 DE102005022260 A1 DE 102005022260A1
Authority
DE
Germany
Prior art keywords
light
wavelength interval
path
interference filter
light source
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.)
Pending
Application number
DE102005022260A
Other languages
German (de)
Inventor
Othmar Zueger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oerlikon Surface Solutions AG Pfaeffikon
Original Assignee
Unaxis Balzers AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Unaxis Balzers AG filed Critical Unaxis Balzers AG
Priority to DE102005022260A priority Critical patent/DE102005022260A1/en
Publication of DE102005022260A1 publication Critical patent/DE102005022260A1/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10Beam splitting or combining systems
    • G02B27/1006Beam splitting or combining systems for splitting or combining different wavelengths
    • G02B27/102Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10Beam splitting or combining systems
    • G02B27/1006Beam splitting or combining systems for splitting or combining different wavelengths
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10Beam splitting or combining systems
    • G02B27/14Beam splitting or combining systems operating by reflection only
    • G02B27/145Beam splitting or combining systems operating by reflection only having sequential partially reflecting surfaces
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/12Picture reproducers
    • H04N9/31Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141Constructional details thereof
    • H04N9/315Modulator illumination systems

Abstract

The present invention relates to a method for combining or splitting the beam paths of substantially unpolarized light of at least three different wavelength intervals. In this case, the splitting off or the combination of the beam path of light of the wavelength interval which lies between the other wavelength intervals takes place when the beam paths of the light of the other two wavelength intervals are already or still combined. The present invention also relates to a lighting unit which comprises a white light source and uses this method by means of interference filters for splitting the white light into red, blue and green light beams. The invention also relates to a lighting unit which comprises a red, green and blue light source and uses these methods by means of interference filters for combining the beam paths of the light sources.

Description

  • technical area
  • The The present invention relates to a device for combination of light of different wavelengths. The invention relates in particular to a lighting unit, which light of red, green and blue narrowband light sources to combine white light can. However, the invention also relates to a lighting unit, which white light in red, green and split blue partial beams is able.
  • today Projectors working on the projection of light for imaging can essentially be divided into 2 categories: Such for the each of the three color channels red (R), green (G) and blue (B) each provide an imaging element (3P projectors = 3 panel projectors). The red color channel is light with wavelength within the wavelength interval from 600 nm to 780 nm. The green color channel is light with wavelength within the wavelength interval from 500 nm to 600 nm. The blue color channel is light with wavelengths within the wavelength interval from 420 nm to 500 nm.
  • It But there are also such projectors that only with an imaging Element and color sequential work (CS projectors = Color Sequential Projectors).
  • A further classification can be made in the way that the imaging Element modulates light to pass on image information. A widespread Class of imaging elements subjects the incoming light one locally resolved Polarization modulation. This polarization modulation is then using polarization-selective optical elements in an intensity modulation transferred. This type of imaging elements must be with polarized light are applied. In the focus of this description stand however, lighting devices for another class of imaging Elements with unpolarized light or only partially polarized light can be applied. The required lighting devices should be able to prepare unpolarized light for exposure.
  • Become broadband, white light sources used in 3P projectors, so must first the white light can be split into the three colors red, green and blue. A possibility to do this is the use of dielectric edge filters. One Edge filter has the task of light in a first wavelength range almost 100% reflect during in a second adjacent wavelength range, it is nearly 100% of the Light should transmit. The area in which the wavelength ranges adjacent, is called the filter edge. Becomes a first edge filter with a filter edge at 500 nm in the beam path of a white light source placed, so will first the blue color of the yellow light associated with the blue color channel cleaved. Yellow light is additive in this case green and red light together. Will now be in the beam path of the yellow Light an edge filter with an edge placed at 600 nm so will go ahead split off from red light.
  • Which one the wavelength ranges is reflected or transmitted, depends on the design of the respective edge filter from. In general, an edge filter which the wavelength range with the smaller wavelengths transmitted while larger wavelength be reflected, referred to as low pass. An edge filter which the wavelength range with the smaller wavelengths reflected while transmitting larger wavelengths will be called a high pass.
  • Become narrowband light sources, such as the light of LEDs used in CS projectors, so there is the lighting arrangement the task the light paths of a red, green and blue narrowband Light source to unite and the light beams on the one imaging To steer element. Again, you can Edge filters are used: a first, which for example the light path of red and green light combined and a second, which the light path of the blue light with the two combined with other light paths.
  • One problematic aspect here is the fact that light both white light sources, as well as light narrowband LEDs in the Usually not unpolarized, but at least not completely polarized light deliver.
  • typically, But edge filters are using dielectric interference layer systems realized on otherwise transparent glass substrates. Interference coating systems however, have characteristics related to polarization dependence prove to be detrimental to the edge filters described herein. In order not to throw a component of the light back into itself, namely, the edge filters become arranged at an angle inclined to the optical axis. The problem with this is that thereby the reflection and transmission behavior of the interference filter becomes polarization dependent. In particular, both depends the position of the edge as well as the reflection and transmission in the Wavelength ranges, the edges adjoin the polarization. For light sources, working with unpolarized or only partially polarized light does this to misdirections of light components. This has one hand Loss of light result and on the other hand, on the respective Color coordinates unfavorable impact.
  • In In the present specification, the optical path is the blue one Part of the light has been called a blue channel. The proportion of the light source radiated blue light that arrives at the imaging element, is called blue channel transmission. Accordingly, one of Rotkanalransmission and spoken by a Grünkanaltransmission. Of course, misdirections of light components lead to a reduction the channel transmission.
  • One Another important factor influencing the channel transmission the Winkelabstrahlcharakteristik the light source or the light sources. The for The lighting used optical elements and filters must therefore have a certain angular acceptance, which is usually due to the F-number expressed becomes. The F number is inversely proportional to the numerical aperture (NA), by the product of refractive index of the medium and half the opening angle the illumination cone is defined. That the smaller the F number, the bigger the required angular acceptance. When calculating the channel transmission the effect that the different angles of incidence on the Transmission characteristics of the edge filters have to be considered. It depends both the position of the edge and the reflection and transmission in the areas adjacent to the edge, from the angle of incidence from. To take this into account will over the different angles of incidence weighted integrated. For the channel transmission this means that the for an angle of incidence first steep edges through integration over different angles lose steepness and thus misdirected light in the edge area becomes.
  • Task of invention
  • Of the The invention is therefore based on the object of specifying a device which overcomes or at least reduces the disadvantages of the prior art. In particular, the device according to the invention is intended to be compared to the State of the art cost-effective solution to be prepared for a Display lighting system with unpolarized light for projectors.
  • Overview of the present invention
  • The solution the task is deviating from the prior art the between the two adjacent wavelength intervals lying green channel to treat separately while red and blue light channel still (in the case of the white light source) or already combined (in the case of narrow-band light sources) are. This means that to separate the red light path from blue light path, or to the combination of the red and the blue light path a very simplified edge filter can be used whose edge within the green Wavelength interval almost arbitrary polarization-dependent and / or angle-dependent can be essential without the separation or combination of red-blue to impair. It is therefore even questionable whether this case of an edge filter in Meaning of the definition given above should be spoken. the In the context of this description, it is generally assumed by talked about a RB splitter. Especially from an RB splitter low pass, when blue light is transmitted and red light is reflected. Correspondingly of a RB splitter high pass, when blue light reflects and red light is transmitted.
  • in the Connection with color management systems for reflective, locally polarization-modulating imaging Elements is such a separate treatment of the green channel already known. However, here the color management system must be light, partly in one and partly in the other polarization of the imaging element polarization modulated and reflected light propagate before a polarization-sensitive optical element converts the polarization modulation into an intensity modulation.
  • at Lighting arrangements for Imaging elements where polarization is irrelevant In contrast, no polarization-selective element is used. According to the present Rather, a so-called green bandpass filter is needed and invention used. Such a filter can be for example, realize that on one side of a substrate a low-pass filter with edge layer is applied at about 600 nm, while on the other side a high pass filter with edge position at approx. 500 nm is applied. In this way, blue light will be on Page reflected with the high pass filter and red light at the Page reflected with the low pass filter. Only green light is transmitted through both sides of the substrate. This allows the efficient combination and / or splitting off of the green light with or from light components that are both red and blue Include light. It is advantageous, as already described above, that extra Filter can be a RB splitter. In the green wavelength range, the transition between red wavelength range and blue wavelength range This does not have to meet specifications and therefore may have effects like polarization shift or angle shift none or at least one play a minor role.
  • In a particularly preferred embodiment however, the bandpass filter does not become the present invention realized on two sides, but new on one side of the substrate applied. That on one side of the substrate becomes the bandpass filter realized by means of a layer system. On the other hand, if for necessary, only a few layers of antireflective coating intended. Such unilateral bandpass filters are commonly considered difficult to manufacture. New, essentially statistical design methods but simplify this task considerably. Amazingly showed that such a one-sided design with only 60% of Total thickness of a comparable two-sided design with essential less coating costs and therefore much more cost-effective can be produced.
  • According to the invention, a method is provided for splitting substantially unpolarized white light into three substantially unpolarized fractions having at least the following steps:
    • Splitting the substantially unpolarized white light into a first portion and a second portion, wherein the first portion comprises substantially unpolarized light of a first wavelength interval and the second portion comprises substantially unpolarized light of a second and a third wavelength interval and the first wavelength interval between second and the third wavelength interval
    • - Splitting the second portion into a third portion having substantially unpolarized light of the second wavelength interval and a fourth portion of substantially unpolarized light of the third wavelength interval.
  • The invention also provides a method for combining the beam paths of a first, substantially unpolarized light beam of a first wavelength interval of a first light source, a second, substantially unpolarized light beam of a second wavelength interval of a second light source and a third, substantially unpolarized light beam of a third wavelength interval of a third A light source, wherein the first wavelength interval is between the second and the third wavelength interval and the method comprises at least the following steps:
    • - Combining the beam paths of the second light beam and the third light beam to a first combined beam path, such that substantially the degree of polarization of the respective light beams is not affected;
    • - Combining the beam path of the first light beam with the first combined beam path such that substantially the degree of polarization of the respective light beams is not affected.
  • In the description, a lighting unit according to the invention is disclosed, comprising
    a first light source for emitting a first, substantially unpolarized light beam of a first wavelength interval,
    a second light source for emitting a second, substantially unpolarized light beam of a second wavelength interval,
    a third light source for emitting a third, substantially unpolarized light beam of a third wavelength interval,
    wherein the first wavelength interval includes wavelengths that are between the second and third wavelength intervals;
    and the second light source and the third light source are arranged so as to intersect the beam paths of the emitted light;
    and in the area of the intersection a first interference filter is provided for combining the beam paths to a first combined beam path;
    and the first light source is arranged such that the beam path of the first light source with the com crossed beam path crosses;
    and in the region of the intersection of the beam path of the first light source and the combined beam path, a second interference filter is provided for combining the first beam path with the combined beam path.
  • Short description the figures
  • tab 1 layer thickness distribution of the two-sided bandpass filter as well the RB splitter and the anti-reflection coating on the back of the RB splitter in nanometers
  • tab 2 layer thickness distribution of the single-sided bandpass filter as well the anti-reflective coating of the back of the bandpass filter in nanometers.
  • 1a Lighting unit with white light source according to the prior art with two edge filters
  • 1b Illumination unit with 3 LEDs according to the prior art with two edge filters
  • 2a Inventive lighting unit with white light source and two-sided band-pass filter and RB splitter
  • 2 B Inventive lighting unit based on LEDs with two-sided band-pass filter and RB splitter
  • 3a Transmission spectrum of a green bandpass filter for light, incident below 45 ° both for parallel application and for loading with F number 1.0
  • 3b Transmission spectrum of an RB splitter High pass for light, incident below 45 ° both for parallel application and for loading with F number 1.0
  • 3c Assumed weighting of angles of incidence
  • 4a Blue channel transmission as a function of wavelength (solid), and spectral distribution of a blue LED
  • 4b Green channel transmission as a function of wavelength (solid), and spectral distribution of a green LED
  • 4c Red channel transmission as a function of the wavelength (solid), and spectral distribution of a red LED
  • 5a Blue channel transmission with LED lighting
  • 5b Green channel transmission with LED lighting
  • 5c Red channel transmission with LED lighting
  • 6 Comparison of the transmissions by bandpass filters, one-sided (dotted line) and two-sided (solid line)
  • 7 Schematic structure of a projector with inventive LED lighting unit.
  • detailed Description of the invention
  • in the The invention will now be described by way of example and with reference to the figures explained in detail become.
  • 1a schematically illustrates the situation according to the prior art in the case of a white light source. In the lighting arrangement 1 of the 1a shown is a white light source, the white light W radiates. Located downstream in the light path below 45 ° is a high pass filter 5 with filter edge at about 500 nm for reflection of blue light B and transmission of green light G and red light R. Further downstream placed in the light path at 45 ° orientation is a low-pass filter 7 with edge layer at about 600 nm, the green light G transmits and red light R reflected.
  • 1b schematically shows a lighting arrangement 10 according to the prior art with respect to narrow-band light sources to be combined. Shown is the blue LED 11 , the red LED 13 and the green LED 15 , their light by means of low-pass filter 7 and high pass filter 5 combined.
  • In contrast, shows 2a a lighting arrangement according to the invention 20 for 3P projectors with white light source 3 , This could be, for example, a UHP lamp that is common today. Downstream of the light source is a green bandpass filter 21 placed at 45 °, on one side of the substrate, a high-pass filter 23 with edge layer at 500 nm is applied and on the other side a low-pass filter 25 is applied with edge layer at 600 nm. Preferably, the band-pass filter is arranged such that the high-pass filter 23 facing the light source. In this way, the blue light, which is usually most unintentionally absorbed by thin film materials, must transmit minimally through thin film layers. Absorption effects are thereby minimized. Through this combination of high pass filter 23 and low pass filters 25 A green bandpass filter is created 21 that reflects blue and red light and transmits green light. Downstream, following the path of the red and blue lights, an RB splitter high pass is arranged, which reflects substantially blue light and transmits red light. Here, of course, an RB splitter lowpass would be possible, but for the reasons mentioned above in terms of absorption of the blue light, it is again advantageous to reflect the blue light. An antireflection coating may be provided on the back side of the substrate of the RB splitter.
  • All filters include thin film alternating layer systems of a high refractive and a low refractive layer material. In the example, Nb 2 O 5 for the high refractive index layer H and SiO 2 for the low refractive index layer L were used as coating materials. Table 1 gives the layer thickness distribution of the respective filters in nanometers, starting from the substrate. The total layer thickness of the bandpass filter 21 adds up to 4360 nm.
  • 3a shows the transmission characteristic for unpolarized light of the green bandpass filter resulting from the two-sided coating. The solid line represents the characteristic at 45 ° angle of incidence The characteristic "steps" at 495 nm and 560 nm are a consequence of the polarization dependence The dotted line represents the characteristic that results when the band pass filter with an F number of Here, it becomes clear that the widening of the angle spectrum softens the edges and thus, for example, reduces the transmission at the maximum in comparison to the 45 ° case, likewise as a consequence of the softening of the edges, the polarization "stages" have disappeared.
  • 3b shows the transmission characteristic for unpolarized light of the RB splitter high-pass for incident angle 45 ° (solid line) and F-number 1.0 (dotted line) It is clear that despite the very small F-number losses are very low. In addition, it should be noted that the RB splitter is chosen to have a flat "edge" even at a mere 45 ° angle of incidence, in the present case the slope is dT / dλ <2% / nm where T is the transmission in percent and λ is the wavelength of the light in nanometers.
  • Of course, the specification of an F-number and the associated transmission characteristic makes sense only if it is clear at the same time how the angular distribution within the illumination cone was weighted. This is why in 3c shown the transmission characteristic underlying angle weighting of the different emission directions of the light source.
  • Looking now at the channel transmission for blue, green and red as in 4a -C shown, it can be seen that at an F-number of 1.0 a very considerable amount of light passes through the respective channel, ie the loss of light is kept within narrow limits. However, additional measures must be taken here to trim the color channels. Especially in the blue channel 4a becomes clear that, for example, by means of a trim filter green light components with maximum at 560 nm must be blocked. However, since the color splitting has already taken place, such a trim filter can be arranged substantially perpendicular to the RB splitter in the beam path. For the red channel and the blue channel analog simple trim filters can be used.
  • According to 2 B become corresponding bandpass filters 21 and RB splitter high pass 27 in a Be Illumination arrangement for combining the light of a blue LED 11 , a green LED 13 and a red LED 15 used. As a result, if the emission spectrum of the LEDs is neglected, substantially the same channel transmission as in FIGS 4a C is shown with the solid line in each case. The 4a In addition, the dotted lines show the spectral distribution of the LED associated with the color channel. To find out how much of the light is actually combined into white light, these spectral distributions must be multiplied by the channel transmission curves. This results in the 5a c. Again, the dotted line indicates the respective emission spectrum of the LED and the solid line indicates the associated color channel transmission. It can be seen from the figures that almost all of the light energy emitted by the LEDs, which is fed into the channels, is transmitted through the respective color channel.
  • In a particularly preferred embodiment of the present invention, the green bandpass filter is realized by means of a one-sided design. Table 2 shows the layer structure of the single-sided bandpass filter. On the other side of the substrate an antireflection coating is provided. Noteworthy in this embodiment is, inter alia, that the total layer thickness, including the layers for the antireflection coating summed to only 2568 nm, making up only 60% of the layer thickness of the two-sided bandpass system. In 6 the transmission curves for the one-sided and the two-sided design for the F-number 1.0 are compared. The solid line refers to the one-sided design, the dotted line refers to the two-sided design. In the areas in which the LEDs considered here have their emission maximum, these filters are equivalent within 2-5%. In the green channel, the one-sided design cuts even better.
  • 7 outlines a projector based on 3 LEDs 100 the lighting unit according to the invention 103 includes. Part of the lighting unit 103 are at least one red LED 105 , at least one blue LED 107 and at least one green LED 109 , In a 45 ° arrangement, as shown here, are green LED 109 and blue LED 107 oriented substantially parallel, while the red LED 105 oriented perpendicular thereto. Another ingredient is a RB splitter high pass 111 , Deviating from what is in the 7 is shown, it is of course possible the blue LED 107 and according to the RB splitter high pass 111 rotated arbitrarily about the axis XX 'to order. This may be advantageous for reasons of space in some cases, for example. It is also possible to deviate from the 45 ° geometry for red and blue and, for example, to go to 30 °. This reduces the polarization effect and additionally simplifies the production of the RB splitter. An essential part of the lighting unit 103 is the bandpass filter 113 , The bandpass filter shown here 113 includes a substrate side facing the green LED which is an antireflective coating 115 and a substrate side facing away from the green LED and a bandpass filter layer system 117 having. Due to this arrangement, the blue light is reflected directly at the surface without having to propagate through the substrate. Since typically shortwave light is absorbed in the substrate, the absorption by such an arrangement can be minimized. Another source of absorption losses are those for the construction of the layer system 117 required layers themselves. In the determination of the bandpass filter layer system 117 For example, a thin-film statistical optimization program may be advantageously used. If, during the determination, care is taken to ensure that blue light is reflected as far as possible on the outermost layers, this procedure again counteracts the absorption.
  • After the illumination unit the optical paths of the radiation of the 3 LED are identical. Downstream is a lens in the now common optical paths 121 arranged the light in the integrator 123 focused. Usually, color sequencing means such as a color wheel would be provided in front of the input of the integrator. However, if the LEDs can be turned on and off quickly enough, no color wheel is needed. At the exit end of the integrator 123 there is a homogeneous light field, which by means of the lens 125 on a DMD chip 127 is projected. In the way between the lens 125 and the imaging element, in this case DMD chip 127 , is a prism 129 arranged. The DMD chip 127 comprises a matrix of individually controllable, movable mirrors. Depending on the position of these mirrors, the light reflected by the mirror passes through the prism 127 to the projection lens 133 or it is reflected away from the projection lens. This way a picture can be created.
  • In the 7 were drawn, starting from the light sources, several radiation angles for clarity. Downstream, from the integrator, these angles have been omitted and only the central beam along the optical axis drawn.
  • In the present description, lighting units for projectors operating with substantially unpolarized light have been presented. However, it is clear that the application of the invention not limited to projectors only. Wherever unpolarized light, possibly even with a wide angular distribution with respect to wavelength intervals must be split and / or merged, the present invention can be advantageously used.
  • Table 1
    Figure 00140001
  • Table 2
    Figure 00150001

Claims (13)

  1. Method for the division of substantially unpolarized white light in three essentially unpolarized Shares with at least the following steps: - splitting of the substantially unpolarized white light in a first Share and a second share, with the first share substantially includes unpolarized light of a first wavelength interval and the second portion is substantially unpolarized light of a second and a third wavelength interval includes and the first wavelength interval between the second and the third wavelength interval - splitting of the second share into a third share with substantially unpolarized light of the second wavelength interval and a fourth Proportion of substantially unpolarized light of the third wavelength interval.
  2. Method according to claim 1, characterized in that that for splitting the white light into the first and second Share a first interference filter placed in the beam path and the interference filter is light of the first wavelength interval essentially complete passes and the interference filter light of the second and third wavelength intervals essentially complete reflected.
  3. Method according to claim 2, characterized in that that for splitting the second share into the third and fourth Share a second interference filter downstream of the first interference filter is placed in the beam path of the second portion and the interference filter essentially passes the third share and the fourth share essentially reflected.
  4. Method according to one of claims 1 to 3, characterized in that the wavelength interval of the fourth portion comprises smaller wavelengths than the wavelength interval of the third portion.
  5. Method according to one of claims 2 to 4, characterized the first interference filter is constructed such that the the light of the second and the third wavelength interval reflecting layers of the interference filter substantially on one side of the layers supporting substrate are provided.
  6. Method according to one of claims 2 to 5, characterized that the wavelength interval of the fourth proportion of smaller wavelengths includes as the wavelength interval of the third component and that or, if appropriate, the interference filters be arranged so that light of the fourth portion each in the essential on the surface of the interference filter (s) is reflected without first entering penetrate substrate covered by the interference filter (s).
  7. Method for combining the beam paths of a first, substantially unpolarized light beam of a first Wavelength interval a first light source, a second, substantially unpolarized light beam a second wavelength interval a second light source and a third, substantially unpolarized Light beam of a third wavelength interval of a third Light source, wherein the first wavelength interval between the second and third wavelength intervals and the method comprises at least the following steps: - Combination the beam paths of the second light beam and the third light beam to a first one Combined beam path, such that substantially the degree of polarization the respective light beams is not affected; - Combination of the beam path of the first light beam with the first combined Beam path such that essentially the degree of polarization the respective light beams is not affected.
  8. Method according to claim 7, characterized in that that for combining the beam paths of the second and the third Light beam, the light sources are aligned so that the beam paths of the second and third light beam and in the area the intersection an interference filter is placed, the second Transmitted light beam and reflected the third light beam.
  9. Method according to claim 8, characterized in that that for combining the beam path of the first light beam and of the first combined beam path, the first light source is aligned is that the beam path of the first light beam with the first combined beam path crosses and in the area of the intersection another interference filter is placed, which is the second and reflects the third light beam and transmits the first light beam.
  10. Method according to claim 9, characterized in that that at the further interference filter those layers of the interference filter, which essentially the for the reflection of the second light beam and the third light beam take care, together on one side of one of the layers bearing Substrates are provided.
  11. Lighting unit comprising a first light source for radiating a first, substantially unpolarized light beam a first wavelength interval, a second light source for emitting a second, substantially unpolarized light beam of a second wavelength interval, a third light source for emitting a third, substantially unpolarized light beam of a third wavelength interval, in which the first wavelength interval wavelength includes, between the second and the third wavelength interval lie; and the second light source and the third light source are arranged such that the beam paths of the cross light emitted; and in the area of the intersection a first interference filter for combining the beam paths to a first combined beam path is provided; and the first Light source is arranged such that the beam path of the first light source with the combined beam path crosses; and in the region of the crossing of the beam path of the first light source and the combined beam path, a second interference filter is provided for combining the first beam path with the combined beam path.
  12. Lighting unit according to claim 11, characterized in that that the second interference filter light of the first light source in essentially transmitted and light the second and the third Reflected light source substantially completely.
  13. Lighting unit according to claim 11, characterized in that that for the reflection of the light of the second light source and the third Light source provided layers of the interference filter substantially provided on a side of a substrate carrying the layers are.
DE102005022260A 2005-05-10 2005-05-10 Device for combining light of different wavelengths Pending DE102005022260A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102005022260A DE102005022260A1 (en) 2005-05-10 2005-05-10 Device for combining light of different wavelengths

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE102005022260A DE102005022260A1 (en) 2005-05-10 2005-05-10 Device for combining light of different wavelengths
KR1020077023485A KR101264950B1 (en) 2005-05-10 2006-05-08 Device for combining light having different wavelengths
CNA2006800158593A CN101171847A (en) 2005-05-10 2006-05-08 Device for combining light having different wavelengths
EP06742824A EP1880554A1 (en) 2005-05-10 2006-05-08 Device for combining light having different wavelengths
PCT/EP2006/004277 WO2006119943A1 (en) 2005-05-10 2006-05-08 Device for combining light having different wavelengths
TW095116211A TW200702869A (en) 2005-05-10 2006-05-08 Device for the combination of light of different wavelength

Publications (1)

Publication Number Publication Date
DE102005022260A1 true DE102005022260A1 (en) 2006-11-16

Family

ID=36764235

Family Applications (1)

Application Number Title Priority Date Filing Date
DE102005022260A Pending DE102005022260A1 (en) 2005-05-10 2005-05-10 Device for combining light of different wavelengths

Country Status (6)

Country Link
EP (1) EP1880554A1 (en)
KR (1) KR101264950B1 (en)
CN (1) CN101171847A (en)
DE (1) DE102005022260A1 (en)
TW (1) TW200702869A (en)
WO (1) WO2006119943A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015111860A1 (en) 2015-07-22 2017-01-26 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Oil circuit and method for lubricating and / or cooling a piston internal combustion engine of a motor vehicle

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012223925A1 (en) * 2012-12-20 2014-06-26 Osram Gmbh Lighting device with pumping light source, phosphor arrangement and filter arrangement
CN104459998B (en) * 2015-01-06 2016-09-28 四川大学 A kind of trichroism photoconverter of RGB based on liquid prism

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE68921496T2 (en) * 1988-01-19 1995-07-20 Hewlett Packard Co Spectral condition device.
EP0869390A2 (en) * 1997-04-04 1998-10-07 Sony Corporation Light generating apparatus, film scanning method, and light integrator
EP1014693A2 (en) * 1998-12-23 2000-06-28 Hewlett-Packard Company Color separation for image scanning with more than three colors
US6147806A (en) * 1997-07-05 2000-11-14 Samsung Electronics Co., Ltd. Apparatus and a method for separating a light beam using a hybrid dichroic mirror and a method for manufacturing the apparatus
US6219110B1 (en) * 1998-11-04 2001-04-17 Ibm Japan, Ltd. Single-panel color projector
US6457828B1 (en) * 1999-04-21 2002-10-01 Minolta Co., Ltd. Display optical apparatus
DE19505988B4 (en) * 1994-02-22 2005-05-04 Matsushita Electric Industrial Co., Ltd., Kadoma Color image reading device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5654775A (en) * 1995-12-27 1997-08-05 Philips Electronics North America Corporation Three lamp, three light valve projection system
JPH11282378A (en) * 1998-03-26 1999-10-15 Sony Corp Color projector
JP2003516558A (en) 1999-12-09 2003-05-13 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Display system with light emitting diode light source
US6525785B2 (en) * 2001-01-22 2003-02-25 K Laser Technology, Inc. Projection apparatus using L-shaped dichroic prism set having a cubically glass block juxtaposed to a dichroic prism for passing light beams without changing direction of the light beams
US7460179B2 (en) * 2002-01-31 2008-12-02 Hewlett-Packard Development Company, L.P. Adaptive image display
EP1471746A3 (en) * 2003-03-31 2006-07-12 Barco N.V. Projection device and lamp source system for such projection device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE68921496T2 (en) * 1988-01-19 1995-07-20 Hewlett Packard Co Spectral condition device.
DE19505988B4 (en) * 1994-02-22 2005-05-04 Matsushita Electric Industrial Co., Ltd., Kadoma Color image reading device
EP0869390A2 (en) * 1997-04-04 1998-10-07 Sony Corporation Light generating apparatus, film scanning method, and light integrator
US6147806A (en) * 1997-07-05 2000-11-14 Samsung Electronics Co., Ltd. Apparatus and a method for separating a light beam using a hybrid dichroic mirror and a method for manufacturing the apparatus
US6219110B1 (en) * 1998-11-04 2001-04-17 Ibm Japan, Ltd. Single-panel color projector
EP1014693A2 (en) * 1998-12-23 2000-06-28 Hewlett-Packard Company Color separation for image scanning with more than three colors
US6457828B1 (en) * 1999-04-21 2002-10-01 Minolta Co., Ltd. Display optical apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015111860A1 (en) 2015-07-22 2017-01-26 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Oil circuit and method for lubricating and / or cooling a piston internal combustion engine of a motor vehicle

Also Published As

Publication number Publication date
KR20080005498A (en) 2008-01-14
WO2006119943A1 (en) 2006-11-16
KR101264950B1 (en) 2013-05-15
TW200702869A (en) 2007-01-16
CN101171847A (en) 2008-04-30
EP1880554A1 (en) 2008-01-23

Similar Documents

Publication Publication Date Title
JP6383937B2 (en) Light source device and projection display device
TWI503578B (en) Light source module and projection apparatus
EP3193503B1 (en) Phosphor device and illumination system and projection apparatus with the same
DE60220365T2 (en) Projection system with selectively reflecting screen
CN201134006Y (en) Light source for projection system and projection display device
JP5574458B2 (en) Illumination device and projection display device using the same
US5098183A (en) Dichroic optical elements for use in a projection type display apparatus
JP4055708B2 (en) Illumination device and projection-type image display device
US6491398B2 (en) Video projector
KR101001451B1 (en) Illuminating optical system
JP4295991B2 (en) Light recovery device for projection display
EP2283391B1 (en) Optical element and color combiner
CN103430093B (en) Phosphor-equipped illumination optical system and projector
EP1640799B1 (en) Laser projector with indoor illumination
KR101588029B1 (en) Lighting device
JP5605047B2 (en) Light source device and projection display device using the same
US8116005B2 (en) Light combiner
US9201295B2 (en) High efficiency LED optical engine for a digital light processing (DLP) projector and method of forming same
US7325956B2 (en) Light-emitting diode (LED) illumination system for a digital micro-mirror device (DMD) and method of providing same
NL1031720C2 (en) A lighting system for adjusting the image ratio and a projection system using the lighting system.
EP1402291B1 (en) Method for producing light of a given polarisation state
KR100671254B1 (en) Dichroic mirror and projection type display unit
TWI464450B (en) Color light combining system for optical projector
US7048380B2 (en) Color switching projection apparatus with two liquid crystal panels
US6116739A (en) Color projection display apparatus

Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8127 New person/name/address of the applicant

Owner name: OC OERLIKON BALZERS AG, BALZERS, LI

8127 New person/name/address of the applicant

Owner name: OERLIKON TRADING AG, TRUEBBACH, TRUEBBACH, CH

R012 Request for examination validly filed

Effective date: 20120301

R016 Response to examination communication