US20190025686A1 - Method for producing a light module, light module and method for operating a light module and computer program product - Google Patents

Method for producing a light module, light module and method for operating a light module and computer program product Download PDF

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Publication number
US20190025686A1
US20190025686A1 US16/068,795 US201716068795A US2019025686A1 US 20190025686 A1 US20190025686 A1 US 20190025686A1 US 201716068795 A US201716068795 A US 201716068795A US 2019025686 A1 US2019025686 A1 US 2019025686A1
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Prior art keywords
light
module
light source
light module
light sources
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Abandoned
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US16/068,795
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English (en)
Inventor
Hansruedi Moser
Marcel WÄSPI
Patrick SPRING
Alexander Ehlert
Frank Fischer
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Fisba AG
Robert Bosch GmbH
Original Assignee
Fisba AG
Robert Bosch GmbH
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Assigned to FISBA AG reassignment FISBA AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MOSER, HANSRUEDI, Spring, Patrick, Wäspi, Marcel
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FISCHER, FRANK, EHLERT, ALEXANDER
Publication of US20190025686A1 publication Critical patent/US20190025686A1/en
Abandoned 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
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2066—Reflectors in illumination beam
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
    • 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
    • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
    • G02B27/104—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with scanning systems
    • 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
    • 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
    • G02B27/30—Collimators
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4012—Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3155—Modulator illumination systems for controlling the light source
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3164—Modulator illumination systems using multiple light sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3185—Geometric adjustment, e.g. keystone or convergence
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
    • H01S5/0071—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for beam steering, e.g. using a mirror outside the cavity to change the beam direction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/022—Mountings; Housings
    • H01S5/023—Mount members, e.g. sub-mount members
    • H01S5/02325—Mechanically integrated components on mount members or optical micro-benches
    • H01S5/02326—Arrangements for relative positioning of laser diodes and optical components, e.g. grooves in the mount to fix optical fibres or lenses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
    • H01S5/4087—Array arrangements, e.g. constituted by discrete laser diodes or laser bar emitting more than one wavelength
    • H01S5/4093—Red, green and blue [RGB] generated directly by laser action or by a combination of laser action with nonlinear frequency conversion

Definitions

  • the invention relates to a method for producing a light module, a light module, and a method for operating a light module and a computer program product according to the preamble of the independent claims.
  • Light modules are already known in which light of different wavelengths is combined in a beam and is then directed onto a projection area.
  • a projection module which directs three light sources each onto a separate dichroic mirror, wherein the emitted light from the light sources is combined by the dichroic mirrors to form a beam, is known from WO 2014/023322.
  • the combined beam is guided onto a MEMS mirror, which then directs the light beam onto a projection surface.
  • the dichroic mirrors are positioned individually during production, and their positions and placement are adapted in such a way that the particular light colour lies exactly over the second and third light colour.
  • a production method of this kind is very complex and costly.
  • the object of the invention is therefore to create a light module and a method for producing a light module which avoid the disadvantages of the prior art.
  • the object of the invention is to create a method and a light module that can be produced economically.
  • the object is achieved by a method for producing a light module, comprising the following steps:
  • the dichroic mirrors are simultaneously placed on the base plate.
  • a positioning module is formed in such a way that it allows simple positioning of the collimation lens, whereas the light source and preferably also the beam combination device is/are already secured in the housing.
  • the positioning module is preferably part of the device and remains in the housing even after production.
  • the positioning module preferably has dimensions of at most 3 ⁇ 3 ⁇ 3 mm.
  • the positioning module can be a cube or a six-sided prism.
  • a prism having eight or more sides is also possible.
  • the individual lateral faces of the prism are used here as standing faces for the prism, so that for example six standing faces are formed in the case of a six-sided prism.
  • a positioning module has a front side and a rear side, wherein the front side is oriented towards the light source and the rear side is oriented away from the light source.
  • the front side and rear side are connected by side faces, on which the positioning module can be placed.
  • a collimation lens is arranged between the front side and rear side, such that the light from the light source can permeate through the collimation lens.
  • the collimation lens is arranged eccentrically in the positioning module, such that the distance between the collimation lens and each of the individual side faces is different.
  • the individual dichroic mirrors can be positioned such that their position and placement is within a predefined tolerance range from one another, wherein the tolerance range lies in the region of +/ ⁇ 0.01 mm, in particular +/ ⁇ 0.005 mm, with regard to the position of the dichroic mirrors from one another and/or in the region of +/ ⁇ 4 mrad, in particular +/ ⁇ 2 mrad, with regard to their placement relative to the normal of the base plate and/or relative to another dichroic mirror.
  • a tolerance range of this kind enables an accuracy sufficient for certain applications or allows the possibility to still correct these tolerances subsequently.
  • the position of the dichroic mirrors from one another within the scope of the invention means that the distances between the individual mirrors correspond to one another in such a way that the distances are the same within the stated tolerance range. Should the position also deviate from a normal, the positions of the mirrors at their position towards the base plate are measured at the lower edge of the dichroic mirror and aligned as a unit if necessary.
  • a beam-shaping module in particular a prismatic telescope, can also be placed on the base plate at the same time as the beam combination device.
  • the prisms of the prismatic telescope preferably do not contact one another.
  • the production costs are further optimised.
  • the tolerance range can lie in the region of +/ ⁇ 0.01 mm, in particular +/ ⁇ 0.005 mm, with regard to the position of the elements of the beam-shaping module, preferably from the dichroic mirrors, and in the region of +/ ⁇ 4 mrad, in particular +/ ⁇ 2 mrad, with regard to the placement relative to the normal of the base plate and/or relative to a dichroic mirror.
  • the arrangement of a beam-shaping module within a tolerance range of this kind enables sufficient accuracy for certain applications. Furthermore, this tolerance range allows a subsequent correction.
  • the arrangement of the beam combination device and preferably also the beam-shaping module can be aligned with one of the light sources.
  • At least one of the light sources is thus aligned optimally, and the accuracy is increased without increasing the production costs.
  • One or more MEMS mirrors can be positioned such that the emitted light from the laser diodes impinges on the MEMS mirror(s) after having passed through the beam combination device and the beam-shaping module.
  • the light can be projected out from the light module through one or more MEMS mirrors, and an image can be produced.
  • Deviations of the emitted light of a light source relative to the emitted light of a further light source can be corrected by a digital correction of the video data upstream of the light source control, such that an optimally superimposed been is produced from emitted light of the light sources.
  • the light module is thus produced with optimised production costs, and at the same time a beam that in this way is more precise is projected onto a projection area, such that no distortions or blurriness is created.
  • a light module for producing light comprises a light source holder, in particular a diode holder, having at least two, preferably three light sources, in particular laser diodes, preferably pressed-in laser diodes.
  • the module comprises a collimation lens per laser diode, preferably a collimation lens in each positioning module, and a beam combination device, which in each case comprises a dichroic mirror per laser diode for combining the light emitted from the respective laser diodes.
  • the light source holder, the collimation lenses, and the beam combination device are preferably arranged on a base plate.
  • the dichroic mirrors are arranged in front of one another within a predefined tolerance range and are distanced from one another, wherein the tolerance range lies in the region of +/ ⁇ 0.01 mm, in particular +/ ⁇ 0.005 mm, with regard to the position of the dichroic mirrors from one another, and/or in the region of +/ ⁇ 4 mrad, in particular +/ ⁇ 2 mrad, with regard to the placement relative to the normal of the base plate and/or relative to another dichroic mirror.
  • a light module of this kind can be produced economically.
  • the light module can comprise a beam-shaping module, preferably a prismatic telescope, which is preferably arranged on the base plate.
  • the shape of the combined beam is optimised by a beam-shaping module.
  • the light module can comprise a light source controller, by means of which the light sources can be controlled.
  • the timing and intensity of each individual light source can be defined individually by the light source controller.
  • the light module can comprise one or more MEMS mirrors, which is/are preferably arranged on the base plate.
  • the combined beam can be projected out from the light module through the one or more MEMS mirrors, such that the beam is movable and can generate a complete image.
  • the one or more MEMs mirrors preferably also can be controlled by the light source controller.
  • Individual elements of the beam-shaping module can be arranged in a tolerance range from one another and preferably from the beam combination device.
  • the tolerance range can lie in the region of +/ ⁇ 0.01 mm, in particular +/ ⁇ 0.005 mm, with regard to the position of the elements of the beam-shaping module, preferably from the dichroic mirrors, and/or in the region of +/ ⁇ mrad, in particular +/ ⁇ 2 mrad with regard to the placement relative to the normal of the base plate and/or relative to a dichroic mirror.
  • a beam combination device positioned in a tolerance range of this kind enables optimised shaping of the combined beam and at the same time can be installed economically.
  • the beam-shaping module can comprise individual elements formed from at least two different glass materials.
  • Different glass materials within the scope of this invention are glasses having different indices of refraction and/or different dispersion.
  • the splitting of the colours, i.e. the offset from one another, by the prismatic telescope is reduced by the use of different materials.
  • At least one red, one green, and one blue laser diode can be formed, wherein the red laser diode is arranged in the diode holder next to the blue laser diode.
  • the laser diode that has the greatest power loss at higher temperatures is therefore arranged next to the laser diode that has the lowest heat development. This optimises the function of the light module.
  • two red, one green and one blue laser diode can be formed, wherein the two red diodes are arranged next to one another, the green diode is arranged next to the red diode, and the blue diode is arranged next to the green diode.
  • the dichroic mirrors can thus be formed more simply since they do not need to form a bandpass.
  • the light module can comprise a correction unit, by means of which the deviations of the emitted light of a light source relative to the emitted light of a second light source can be corrected by a digital correction calculation of the video data, such that an optimally superimposed beam is created from emitted light of the light sources.
  • the correction unit is preferably formed by a video processing section, in particular preferably an application-specific integrated circuit (ASIC) or a video controller.
  • ASIC application-specific integrated circuit
  • a sharp, undistorted image can thus be produced using an economically produced light module.
  • the object is also achieved by a light module produced by means of a method as described above.
  • a light module of this kind has optimised production costs.
  • the invention also relates to a method for operating a light module, preferably as described above, comprising the following steps:
  • the one or more MEMS mirrors and/or the light sources can be controlled by means of the light source controller with correction unit in such a way that deviations in the superimposition between the light of the individual light sources are corrected, in particular the timing of the laser pulses and the laser power (colour value) are adjusted.
  • a method of this kind leads to undistorted, sharp images, wherein the light module can be produced economically.
  • the combined light or the light produced in each case can be shaped by means of a beam-shaping device, in particular a prismatic telescope.
  • the imaging quality is thus increased.
  • the object is also achieved by a computer program product that can be directly loaded into the internal memory of a digital computer or that is stored on a medium and comprises software code portions by means of which the steps as described above are carried out when the product is run on a computer.
  • the computer program product is formed in the correction unit.
  • the imaging quality is thus optimised.
  • the computer program product can be a video processing section which is formed in hardware or in embedded software in an ASIC or video controller upstream of a light source controller, in particular laser controller, and comprises digital processing operations, by means of which the position and the colour value of the projected pixels are corrected.
  • the computer program product can be configured to control one or more MEMS mirrors in a light module, in particular a light module as described above.
  • the light module comprises one or more MEMS mirrors and a light source controller, in particular a laser controller, wherein the one or more MEMS mirrors and the light sources can be acted on by the light source controller with correction unit in such a way that deviations in the superimposition between the light of individual light sources of the light module are corrected, in particular the timing of the laser pulses and the laser power (colour value) are adjusted.
  • a correction method will be described hereinafter for correction of the laser-spot deviations on account of a lack of individual alignment of the individual components on account of passive assembly, i.e. simultaneous placement of optical elements on a base plate.
  • the correction of the laser-spot deviations can also be applied for image optimisation without passive assembly.
  • an offset of components in the optical path can be tolerated if the individual projected colour channels, i.e. in particular emitted light of individual light sources, are corrected, depending on their individual faults, in the digital video processing of the projector, i.e. in particular light module with MEMS mirror or mirrors, in such a way that the individual pixels of the colour channels, in spite of divergence, come to lie on top of one another, preferably with an accuracy of ⁇ 0.25 pixels, within a frame of a projector image.
  • a distortion of the image can firstly be determined on the basis of precisely one reference channel, and correction terms for each individual image point are then preferably calculated.
  • the reference channel can be formed by any light source.
  • a correction term can be determined for the offset of each individual produced spot of each colour channel relative to the reference channel and added to the correction term of the distortion.
  • the correction term for the offset is of a lower order than the correction term for the distortion, such that an optimal image is attained with lower processing power.
  • a distortion correction with a correction term for just one reference channel is firstly determined, by means of which all image points of the video source (arrangement geometry for example right-angled display with 16 : 9 format) can be transferred into the system of projector coordinates, which generally deviate significantly from the right-angled video format of the image source.
  • the reference channel used for this image distortion correction can be one of the used laser channels, but for example the geometric centre point from all laser channels can also be selected in order to determine the correction terms. In any case, just one channel is used in order to determine the image distortion correction.
  • the correction of this offset is performed within the video processing sequence only after the distortion correction of the reference channel.
  • the distortion correction is performed with a polynomial of higher order, for example with a polynomial of 5 th order.
  • the translatory correction of the placement (offset) of each active colour channel relative to the reference channel is determined in particular with a polynomial of lower order (for example 3 rd order) and is added to the distortion compensation of the reference channel.
  • the processing-intensive distortion correction is thus performed only for one reference channel, and the simpler offset correction is performed for each laser channel with a simpler polynomial.
  • FIG. 1 shows a schematic depiction of a light module
  • FIG. 2 shows a perspective view of a light module
  • FIG. 3 shows a schematic depiction of a light module with MEMS mirror
  • FIG. 4 shows, by way of example, an image distortion in the projector coordinate system (stars) compared to the undistorted image (crosses),
  • FIG. 5 shows a pixel offset in the projector coordinate system with an offset of two laser channels
  • FIG. 6 shows the schematic sequence of the specific correction of translational offset of different laser channels.
  • FIG. 1 shows a schematic depiction of a light module 1 having four light sources 2 , which are pressed in the light source holder 3 .
  • the light sources 2 are laser diodes, wherein the laser diode 2 a emits red light, the laser diode 2 b emits blue light, and the laser diode 2 c emits green light.
  • a second red laser diode 2 d is provided.
  • a polarisation adjustment device (not shown) is formed in one of the two laser diodes.
  • the beam combination device 4 comprises four dichroic mirrors 5 a , 5 b , 5 c and 5 d .
  • Positioning modules 8 are provided one between each of the laser diodes 2 a , 2 b , 2 c and 2 d and the beam combination device 4 , each positioning module having a collimation lens 6 .
  • the collimation lens 6 is arranged asymmetrically in the positioning module 8 , such that the distance of the lens from each of the side walls perpendicularly to the direction of propagation of the light is different.
  • the light module 1 also comprises a beam-shaping module 9 in the form of a prismatic telescope. The beam-shaping module 9 is placed on the base plate 7 at the same time as the beam combination device 4 . The elements of the beam combination device 4 and of the beam-shaping module 9 will not be further aligned individually once placed on the base plate 7 .
  • FIG. 2 shows a perspective view of the light module according to FIG. 1 .
  • the collimation lens 6 in the positioning module 8 can be seen and is arranged asymmetrically within the positioning module 8 .
  • FIG. 3 shows a light module according to FIG. 1 , wherein the light module 1 also comprises a MEMS mirror 10 and a light source controller 12 with correction unit.
  • the MEMS mirror 10 and the light sources 2 are acted on by the light source controller 12 with correction unit in such a way that deviations from an optimal superimposition of the emitted radiation of the individual light sources when projected through the MEMS mirror 10 are corrected, in particular by adjusting the time of the laser pulse and the laser power.
  • a correction of this kind is attained by a correction unit, which is preferably integrated in the form of a video processing section into the controller of the MEMS mirror 10 and of the light sources 2 in the light source controller 12 .
  • the light deflected by the MEMS mirror 10 is directed through an exit window 11 onto a projection area.
  • FIG. 4 shows the principle of transfer of the coordinates of an image or video source (for example 16:9, right-angled geometry, 854 ⁇ 480 resolution) into the target coordinate system of the projector (non-right-angled geometry on account of distortion by optical path).
  • the shift of exemplary individual image points from the coordinate system of the image or video source ( 1 , 1 ), ( 1 , 2 ) or ( 2 , 1 ) into the projector coordinate system ( 1 ′, 1 ′), 1 ′, 2 ′) or ( 2 ′, 1 ′) is shown.
  • This image distortion must be eliminated by a correction term of relatively high order, for example fifth order. This is performed exclusively for the reference channel.
  • the target coordinates of the undistorted image display are shown as grey crosses.
  • the geometry is generally right-angled, as is the case for example in standard displays.
  • the image points are typically located equidistantly within a row or a column.
  • the coordinates of the projector coordinate system black stars
  • the colour value of the projector coordinates ( 2 ′, 2 ′) for example is thus determined by an interpolation of the video coordinates ( 1 , 1 ) and ( 1 , 2 ). This correction is all the smaller, the smaller is the deviation between projector coordinate and target coordinate or video coordinate.
  • the deviation can be determined by means of a camera system. Correction terms for each image point are thus calculated on this basis (polynomial correction for example of 5 th order).
  • FIG. 5 shows the pixel offset in the projector coordinate system in the case of an offset of two laser channels.
  • the correction of this offset can be performed with a low residual error already with correction terms of lower order.
  • FIG. 6 shows the underlying schema of the pixel translation correction.
  • the following function blocks are provided here:
  • Rasterizer defines the non-linear coordinate system of the projection (projector coordinates), the position of which is dependent on the geometries in the laser scanner along the optical path (angle of incidence of laser relative to moving mirror axes, angle between the MEMS mirror axes, scanning angle). Distortion parameters are for this purpose read in by means of a camera system.
  • 5th order polynomial X (Y) Recalculation of the pixel information for the reference channel in the space of the projector coordinates for X and Y coordinates from the values of the video source (standard video format/geometry).
  • Y Recalculation of the pixel information for the reference channel in the space of the projector coordinates for X and Y coordinates from the values of the video source (standard video format/geometry).
  • correction with polynomial of fifth order correction with polynomial of fifth order.
  • 3rd order polynomial additional correction of the pixel placement for each colour channel based on the reference channel with a polynomial of lower order (here specifically of third order).
  • R0y, r1y, gy, by, . . . Calculated intensity values for the colour channels in the space of the projector coordinates (here, for example, two red channels r0 and r1, one green channel g and one blue channel b are used).

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  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Engineering & Computer Science (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Geometry (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Projection Apparatus (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Semiconductor Lasers (AREA)
US16/068,795 2016-01-11 2017-01-02 Method for producing a light module, light module and method for operating a light module and computer program product Abandoned US20190025686A1 (en)

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EP16150760.3A EP3190790A1 (de) 2016-01-11 2016-01-11 Verfahren zur herstellung eines lichtmoduls, lichtmodul sowie verfahren zu betreiben eines lichtmoduls und computerprogramm-produkt
EP16150760.3 2016-01-11
PCT/EP2017/050022 WO2017121654A1 (de) 2016-01-11 2017-01-02 Verfahren zur herstellung eines lichtmoduls, lichtmodul sowie verfahren zu betreiben eines lichtmoduls und computerprogrammprodukt

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CN113932736B (zh) * 2021-09-23 2022-12-02 华中科技大学 一种基于结构光的3d量测方法与系统
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US20190028684A1 (en) 2019-01-24
JP6594552B2 (ja) 2019-10-23
US10747095B2 (en) 2020-08-18
WO2017121698A1 (de) 2017-07-20
EP3190790A1 (de) 2017-07-12
WO2017121654A1 (de) 2017-07-20
JP2019503616A (ja) 2019-02-07
CN108463999B (zh) 2021-06-15
JP2019503079A (ja) 2019-01-31
DE102017200101A1 (de) 2017-07-13
EP3424215B1 (de) 2022-10-19
CN108463999A (zh) 2018-08-28

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