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WO2014162415A1 - Dispositif de projection et affichage tête haute - Google Patents

Dispositif de projection et affichage tête haute Download PDF

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Publication number
WO2014162415A1
WO2014162415A1 PCT/JP2013/059878 JP2013059878W WO2014162415A1 WO 2014162415 A1 WO2014162415 A1 WO 2014162415A1 JP 2013059878 W JP2013059878 W JP 2013059878W WO 2014162415 A1 WO2014162415 A1 WO 2014162415A1
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WO
WIPO (PCT)
Prior art keywords
light
light receiving
receiving element
laser
optical axis
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.)
Ceased
Application number
PCT/JP2013/059878
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English (en)
Japanese (ja)
Inventor
彰 矢崎
真之介 福田
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.)
Pioneer Corp
Original Assignee
Pioneer Corp
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 Pioneer Corp filed Critical Pioneer Corp
Priority to PCT/JP2013/059878 priority Critical patent/WO2014162415A1/fr
Publication of WO2014162415A1 publication Critical patent/WO2014162415A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H04N9/317—Convergence or focusing systems
    • 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
    • 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
    • G02B26/10—Scanning systems
    • G02B26/101—Scanning systems with both horizontal and vertical deflecting means, e.g. raster or XY scanners
    • 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
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • 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
    • H04N9/3135—Driving therefor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2380/00—Specific applications
    • G09G2380/10—Automotive applications
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G09G3/002—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to project the image of a two-dimensional display, such as an array of light emitting or modulating elements or a CRT

Definitions

  • the present invention relates to a technical field for correcting an optical axis shift of laser light.
  • a technique for detecting the deviation of the optical axis of each color light source used for drawing an image is known.
  • the first light source is turned on and off and the second light source is turned on and off, and the first light source in the light receiving region of the light receiver is controlled.
  • a technique for detecting a deviation between the optical axis of the first light source and the optical axis of the second light source is proposed based on the reception timing of the light and the reception timing of the second light in the light receiving region of the light receiver. Yes.
  • the main object of the present invention is to provide a projection apparatus capable of detecting an optical axis shift without being affected by external factors such as vibration.
  • the projection device projects an image based on an image signal, and a plurality of light sources that emit light beams of different colors, and the intensity of each of the light beams based on the image signal
  • Control means for controlling the scanning, scanning means for scanning each of the combined light beams in a predetermined area including a drawing area, and receiving each of the light beams being scanned in a non-drawing area in the predetermined area
  • a detecting means for detecting a deviation of the center of each spot of the light beam based on an output signal of the light receiving element, and the control means receives the light beam by the light receiving element.
  • all of the light beams are caused to emit light, and the light receiving element outputs an output signal corresponding to the intensity of each of the received light beams.
  • FIG. 1 shows a configuration of an image drawing apparatus according to each embodiment.
  • positioning of a micro lens array and a light receiving element is shown. It is an image figure which shows the specific example of an optical axis offset.
  • the front view of a light receiving element is shown. A mode that each laser beam is irradiated to the light receiving element is shown. The output waveform of the light receiving element in the example of FIG. 5 is shown.
  • the light receiving element in 2nd Example is shown.
  • a mode that the light-receiving element based on 2nd Example is irradiated with the laser beam is shown.
  • the output waveform of the light receiving element in the example of FIG. 8 is shown.
  • the front view of the light receiving element in 3rd Example is shown.
  • (A) It is a figure which shows a part of structure of the image drawing apparatus 1 which concerns on a modification.
  • (B) It is the figure which observed the micro lens array and the reflection type diffuser from the direction of arrow Z. In the modification, the front view of the light receiving element irradiated with the red laser beam is shown. The structural example of a head-up display is shown.
  • a projection device that projects an image based on an image signal, and a plurality of light sources that emit light beams of different colors, and the light beam based on the image signal.
  • Control means for controlling each intensity, scanning means for scanning each of the combined light beams in a predetermined area including a drawing area, and non-drawing area in the predetermined area of the light beam being scanned
  • a light-receiving element that receives each of the light-receiving elements; and a detection unit that detects a deviation of each spot center of the light beam based on an output signal of the light-receiving element, and the control unit includes: At the timing of receiving light, all of the light beams are caused to emit light, and the light receiving element outputs an output signal corresponding to the intensity of each of the received light beams.
  • the projection apparatus includes a plurality of light sources, control means, scanning means, light receiving elements, and detection means.
  • the light sources emit light beams of different colors.
  • the scanning unit scans each of the combined light beams within a predetermined area including the drawing area.
  • the light receiving element receives each of the light beams scanned in the non-drawing area within the predetermined area.
  • the detecting means detects the deviation of each spot center of the light beam based on the output signal of the light receiving element.
  • the control means causes all of the light beams to emit at the timing when the light receiving element receives each of the light beams, and the light receiving element outputs an output signal corresponding to each intensity (light quantity) of the received light beam. .
  • the projection device detects the optical axis shift of each light beam based on the output signal of the light receiving element when a plurality of light beams are simultaneously emitted, so that the light is not affected by external factors such as vibration. Axis deviation can be detected.
  • the optical device includes an optical element that deforms each spot shape of the light beam that is scanned in the non-drawing area in the predetermined area into an ellipse, and the light receiving element is deformed by the optical element. Each of the light beams thus received is received.
  • the projection apparatus can change the spot shape of the light beam into a shape suitable for detecting the optical axis deviation, and improve the detection accuracy of the optical axis deviation.
  • the light receiving element is a block that outputs an output signal corresponding to the intensity of each of the received light beams, and each of adjacent two rows and one column or two rows and two columns. Has a block.
  • the projection apparatus can preferably detect the optical axis deviations in the main scanning direction and the sub-scanning direction.
  • the light receiving area of each color in the block is arranged in line symmetry with the light receiving area that receives the same color in a block adjacent to the block.
  • the light receiving element can simultaneously receive a plurality of light beams and suitably output the intensity of each light beam.
  • the light receiving areas of the respective colors in the block are arranged based on the spot diameter of the light beam of the received color.
  • the spot diameter is proportional to the wavelength of the color of the beam. Therefore, according to this aspect, the light receiving element can simultaneously receive a plurality of light beams having different spot diameters and suitably output the intensity of each light beam.
  • the detection unit detects a direction of deviation of each spot center of the light beam based on an output signal from each block of the light receiving element.
  • the projection apparatus can preferably detect the optical axis shifts in the main scanning direction and the sub-scanning direction.
  • the head-up display includes any of the above-described projection devices, and causes the image to be viewed as a virtual image from the position of the user's eyes.
  • the head-up display can detect an optical axis shift without being influenced by external factors such as vibration, and can output an image with good image quality.
  • FIG. 1 shows a configuration of an image drawing apparatus 1 to which a projection apparatus according to the present invention is applied.
  • the image drawing apparatus 1 includes an image signal input unit 2, a video ASIC 3, a frame memory 4, a ROM 5, a RAM 6, a laser driver ASIC 7, a MEMS control unit 8, and a laser light source unit 9. And comprising.
  • the image drawing apparatus 1 is used as a light source for a head-up display, for example, and emits light constituting a display image to an optical element such as a combiner.
  • the image signal input unit 2 receives an image signal input from the outside and outputs it to the video ASIC 3.
  • the video ASIC 3 is a block that controls the laser driver ASIC 7 and the MEMS control unit 8 based on the image signal input from the image signal input unit 2 and the scanning position information “Sc” input from the MEMS mirror 10, and the ASIC (Application) It is configured as Specific Integrated Circuit).
  • the video ASIC 3 includes a synchronization / image separation unit 31, a bit data conversion unit 32, a light emission pattern conversion unit 33, and a timing controller 34.
  • the synchronization / image separation unit 31 separates the image data displayed on the image display unit and the synchronization signal from the image signal input from the image signal input unit 2 and writes the image data to the frame memory 4.
  • the bit data conversion unit 32 reads the image data written in the frame memory 4 and converts it into bit data.
  • the light emission pattern conversion unit 33 converts the bit data converted by the bit data conversion unit 32 into a signal representing the light emission pattern of each laser.
  • the timing controller 34 controls the operation timing of the synchronization / image separation unit 31 and the bit data conversion unit 32.
  • the timing controller 34 also controls the operation timing of the MEMS control unit 8 described later.
  • the image data separated by the synchronization / image separation unit 31 is written.
  • the ROM 5 stores a control program and data for operating the video ASIC 3. Various data are sequentially read from and written into the RAM 6 as a work memory when the video ASIC 3 operates.
  • the laser driver ASIC 7 is a block that generates a signal for driving a laser diode provided in a laser light source unit 9 described later, and is configured as an ASIC.
  • the laser driver ASIC 7 includes a red laser driving circuit 71, a blue laser driving circuit 72, and a green laser driving circuit 73.
  • the red laser driving circuit 71 drives the red laser “LD1” based on the signal output from the light emission pattern conversion unit 33.
  • the blue laser driving circuit 72 drives the blue laser “LD2” based on the signal output from the light emission pattern conversion unit 33.
  • the green laser driving circuit 73 drives the green laser “LD3” based on the signal output from the light emission pattern conversion unit 33.
  • the MEMS control unit 8 controls the MEMS mirror 10 based on a signal output from the timing controller 34.
  • the MEMS control unit 8 includes a servo circuit 81 and a driver circuit 82.
  • the servo circuit 81 controls the operation of the MEMS mirror 10 based on a signal from the timing controller.
  • the driver circuit 82 amplifies the control signal of the MEMS mirror 10 output from the servo circuit 81 to a predetermined level and outputs the amplified signal.
  • the laser light source unit 9 emits laser light based on the drive signal output from the laser driver ASIC 7.
  • the laser light source unit 9 mainly includes a red laser LD1, a blue laser LD2, a green laser LD3, collimator lenses 91a to 91c, reflection mirrors 92a to 92c, a microlens array 94, and a lens. 95 and the light receiving element 100.
  • the red laser LD1 emits red laser light (also referred to as “red laser light LR”)
  • the blue laser LD2 emits blue laser light (also referred to as “blue laser light LB”)
  • Green laser light also referred to as “green laser light LG” is emitted.
  • the collimator lenses 91a to 91c convert the red, blue, and green laser beams LR, LB, and LG into parallel beams and emit the parallel beams to the reflection mirrors 92a to 92c.
  • the reflection mirror 92b reflects the blue laser light LB
  • the reflection mirror 92c transmits the blue laser light LB and reflects the green laser light LG.
  • the reflection mirror 92a transmits only the red laser beam LR and reflects the blue and green laser beams LB and LG.
  • the red laser light LR transmitted through the reflection mirror 92 a and the blue and green laser beams LB and LG reflected by the reflection mirror 92 a are incident on the MEMS mirror 10.
  • the MEMS mirror 10 functions as “scanning means” in the present invention, and reflects the laser light incident from the reflection mirror 92a toward a microlens array 94 which is an example of EPE (Exit Pupil Expander).
  • the MEMS mirror 10 basically moves so as to scan the microlens array 94 as a screen under the control of the MEMS control unit 8 in order to display the image input to the image signal input unit 2.
  • the scanning position information at that time (for example, information such as the angle of the mirror) is output to the video ASIC 3.
  • the microlens array 94 a plurality of microlenses are arranged, and the laser beam reflected by the MEMS mirror 10 is incident thereon.
  • the lens 95 enlarges an image formed on the radiation surface of the microlens array 94.
  • the light receiving element 100 is provided in the vicinity of the microlens array 94. Specifically, the microlens array 94 is provided at a position including a drawing area “RR” (corresponding to an area for displaying an image (video) to be presented to the user; the same shall apply hereinafter). On the other hand, the light receiving element 100 is provided at a position corresponding to a predetermined area outside the drawing area RR. A specific arrangement of the light receiving element 100 will be described later with reference to FIG.
  • the light receiving element 100 includes a photoelectric conversion element such as a photodetector, and supplies a detection signal “Sd”, which is an electrical signal corresponding to the amount (intensity) of incident laser light, to the video ASIC 3. As will be described later, the light receiving element 100 detects the amount of laser light of each color of RGB.
  • the video ASIC 3 detects the optical axis shift of the red laser light LR, the blue laser light LB, and the green laser light LG based on the detection signal Sd from the light receiving element 100. Further, the video ASIC 3 performs processing for correcting the optical axis deviation based on the detected optical axis deviation. Specifically, the video ASIC 3 corrects the optical axis deviation by changing the light emission timing of the red laser LD1, the blue laser LD2, and / or the green laser LD3. At this time, the video ASIC 3 changes the above-described adjustment amount of the light emission timing based on whether the optical axis shift direction is the main scanning direction or the sub-scanning direction.
  • the video ASIC 3 functions as “control means” and “detection means” in the present invention.
  • FIG. 2 is a diagram illustrating an arrangement example of the microlens array 94 and the light receiving element 100.
  • FIG. 2 shows a view in which the microlens array 94 and the light receiving element 100 are observed from the direction along the traveling direction of the laser light (the arrow “Z” direction in FIG. 1).
  • a scannable region “SR” represented by a broken line is a region corresponding to a range where scanning by the MEMS mirror 10 is possible, that is, a range where drawing is possible.
  • a microlens array 94 is disposed in the scannable region SR.
  • a region represented by a one-dot chain line in the microlens array 94 indicates a drawing region RR.
  • the light receiving element 100 is an area within the scannable area SR and is provided above the microlens array 94. That is, the light receiving element 100 is provided at a position corresponding to a region outside the drawing region RR (also referred to as a “non-drawing region”) so as not to disturb display.
  • the MEMS mirror 10 draws an image (video) to be displayed in the drawing region RR by scanning the laser beam a plurality of times (that is, performing a raster scan) as indicated by an arrow in FIG.
  • the sub-scanning direction of the laser light is also referred to as “left-right direction”
  • the main scanning direction perpendicular to the sub-scanning direction is also referred to as “up-down direction”.
  • the position where the light receiving element 100 is arranged is not limited to that shown in FIG.
  • the light receiving element 100 can be arranged at various positions as long as the position corresponds to the non-drawing region in the scannable region SR.
  • the video ASIC 3 turns on lasers of all colors simultaneously for a predetermined range including the position of the light receiving element 100 in the scannable region SR (also simply referred to as “scan region Rtag”). Scanning is performed in the state, and the optical axis deviation in the left-right direction is detected based on the timing at which the light receiving element 100 receives the laser light of each color. Thereby, the video ASIC 3 detects the optical axis shift without being influenced by external factors such as vibration.
  • FIG. 3A shows an example of the red laser light LR, the blue laser light LB, and the green laser light LG emitted from the image drawing device 1.
  • FIG. 3B corresponds to each of the red laser light LR, the blue laser light LB, and the green laser light LG irradiated on the microlens array 94 disposed at the position “P” in FIG. An example of a spot to be performed is shown.
  • FIG. 3B corresponds to each of the red laser light LR, the blue laser light LB, and the green laser light LG irradiated on the microlens array 94 disposed at the position “P” in FIG.
  • the circles with the letters “R”, “B”, and “G” written therein indicate the spots of the red laser beam LR, the blue laser beam LB, and the green laser beam LG, respectively.
  • the optical axis of the blue laser light LB is shifted upward by 2 dots (pixels) with respect to the optical axis of the red laser light LR
  • the optical axis of the green laser light LG is the red laser light.
  • the optical axis of LR it is shifted downward by 2 dots and is shifted rightward by 1 dot.
  • the image drawing apparatus 1 detects such an optical axis shift and the direction of the optical axis shift, and the lasers LD1 to LD3 are arranged so that the optical axes of the laser beams LR, LB, and LG coincide with each other. Controls the light emission timing.
  • a color filter corresponding to each color of RGB is attached to a light receiving element such as a photodiode or a CCD, and detects the amount of light of each of the RGB laser beams.
  • FIG. 4 shows a view of the light receiving element 100 observed from the direction indicated by the arrow Z in FIG.
  • the light receiving element 100 includes a red light receiving area Ar for measuring light of the red laser light LR, a green light receiving area Ag for measuring light of the green laser light LG, and a blue light receiving area for measuring light of the blue laser light LB. It has a block area B made of Ab.
  • a filter that transmits only the color of the red laser light LR is provided in the red light receiving area Ar.
  • the green light receiving area Ag is provided with a filter that transmits only the color of the green laser light LG
  • the blue light receiving area Ab is provided with a filter that transmits only the color of the blue laser light LB.
  • FIG. 1 shows a view of the light receiving element 100 observed from the direction indicated by the arrow Z in FIG.
  • the light receiving element 100 includes a red light receiving area Ar for measuring light of the red laser light LR, a green light receiving area Ag for measuring light of the green laser light LG, and a
  • the red light receiving area Ar, the green light receiving area Ag, and the blue light receiving area Ab are rectangular with the sub-scanning direction as the longitudinal direction, and are arranged adjacent to each other in the vertical direction.
  • the light receiving element 100 does not detect the amount of light in a region other than the red light receiving area Ar, the green light receiving area Ag, and the blue light receiving area Ab.
  • the block area B is an example of the “block” in the present invention.
  • the light receiving element 100 can simultaneously detect the light amounts of the laser beams LR, LB, and LG.
  • the red light receiving area Ar, the green light receiving area Ag, and the blue light receiving area Ab are also simply referred to as “light receiving areas”.
  • the video ASIC 3 causes the MEMS mirror 10 to perform scanning with the lasers of all colors turned on at the same time for the scanning region Rtag.
  • the video ASIC 3 recognizes the timing at which each light receiving area of the light receiving element 100 receives the laser beam of each color based on the received detection signal Sd, and detects the optical axis deviation in the left-right direction.
  • the video ASIC 3 is also referred to as a time at which each light receiving area starts receiving light (also referred to as “light receiving start time”) or a time at which each light receiving area stops receiving light (also referred to as “light receiving end time”).
  • the video ASIC 3 To detect the optical axis deviation. As described above, the video ASIC 3 detects the optical axis deviation based on the output of the light receiving element 100 in the state where the lasers of all colors are turned on simultaneously, so that the optical axis deviation is not affected by external factors such as vibration. Is detected with high accuracy.
  • FIG. 5 shows the light receiving element 100 being irradiated with the spots “Sr”, “Sb”, and “Sg” of the laser beams LR, LB, and LG.
  • the optical axes of the red laser beam LR and the blue laser beam LB coincide, and the optical axis of the green laser beam LG is shifted by a predetermined distance to the left from the optical axes of the other laser beams.
  • the spot diameter is proportional to the wavelength of the color of the laser light. Therefore, in FIG. 5, the spot Sr has the largest spot diameter and the spot Sb has the smallest spot diameter. have.
  • FIG. 6 shows an output waveform of the light receiving element 100 in the example of FIG.
  • the graph “Gr” indicates the time change of the light amount detected by the red light receiving area Ar
  • the graph “Gb” indicates the time change of the light amount detected by the blue light receiving area Ab
  • the graph “Gg” The time change of the light quantity which the green light reception area Ag detected is shown.
  • the red light receiving area Ar receives light from time “Tr1” to time “Tr2
  • the blue light receiving area Ab receives light from time “Tb1” to time “Tb2”.
  • the green light receiving area Ag is assumed to receive light from time “Tg1” to time “Tg2”.
  • the video ASIC 3 measures the optical axis deviation in the left-right direction based on the times Tr1, Tb1, and Tg1, which are the light reception start times of the red light receiving area Ar, the blue light receiving area Ab, and the green light receiving area Ag. To do. At this time, the video ASIC 3 corrects the times Tr1, Tb1, and Tg1 that are the light reception start times in consideration of the difference in the spot diameters and the arrangement of the respective light reception areas, and corrects each light reception start time (“after correction”). Based on the time difference of “light reception start time”), the direction and width of the optical axis deviation are calculated.
  • the light reception start time of each laser beam varies depending on the size of the spot diameter and the arrangement of each light receiving area. Specifically, even when the optical axes of the laser beams are coincident, the light reception start time of the laser light having a large spot diameter is earlier than the light reception start time of the laser light having a small spot diameter. In addition, the light reception start time of the green light reception area Ag arranged in the center of the light reception areas is earlier than the light reception start times of the other light reception areas.
  • the video ASIC 3 stores in advance a light reception start time error in a memory such as the ROM 5 when the optical axes of the respective laser beams coincide with each other, and corrects the light reception start time after correction based on the error. Based on this time difference, the direction and width of the optical axis deviation are calculated.
  • the video ASIC 3 uses a reference laser beam based on a front-rear relationship between a corrected light reception start time of a predetermined laser beam (also referred to as “reference laser beam”) and a corrected light reception start time of another laser beam. Then, it is recognized whether the other laser beam is displaced in the left or right direction.
  • the video ASIC 3 calculates the time difference between the corrected light reception start time of the reference laser light and the corrected light reception start time of the other laser light, and calculates the distance obtained by multiplying the time difference by the traveling speed of the laser light. It is recognized as the deviation width of the optical axis between the reference laser beam and other laser beams. In this case, the video ASIC 3 moves the optical axis of the laser beam LG, which is shifted from the optical axis of the reference laser, based on the recognition result of the optical axis shift so as to coincide with the optical axis of the reference laser beam.
  • the video ASIC 3 replaces the light reception start time with the light reception end times Tr2, Tb2, and Tg2 of the red light reception area Ar, the blue light reception area Ab, and the green light reception area Ag. You may recognize the optical axis offset in the left-right direction. Even in this case, as in the case of the light reception start time, the video ASIC 3 corrects the light reception end time based on the difference in the spot diameter and the error based on the arrangement of the respective light reception areas, and sets the time difference between the corrected light reception end times. Based on this, the direction and width of the optical axis deviation are calculated.
  • the video ASIC 3 calculates an intermediate time (also referred to as “light reception intermediate time”) between the light reception start time and the light reception end time of each light receiving area, and based on the calculated time difference between the light reception intermediate times. Measure the optical axis deviation in the left-right direction.
  • the light reception intermediate time corresponds to the time when the centers of the spots Sr, Sb, and Sg of the respective laser beams pass through the centers of the light receiving areas Ar, Ab, and Ag in the left-right direction.
  • the video ASIC 3 has the light reception intermediate time of the red light reception area Ar as time “Trm”, the light reception intermediate time of the blue light reception area Ab as time “Tbm”, and the light reception intermediate of the green light reception area Ag. It is recognized that the time is the time “Tgm”. Then, the video ASIC 3 determines that the optical axes of the red laser beam LR and the blue laser beam LB match because the time Trm and the time Tbm are the same time. The video ASIC 3 is obtained by multiplying the time width Tw by the traveling speed of the laser light in the left direction because the time Tgm is later than the time Trm by the predetermined time width “Tw”.
  • the video ASIC 3 changes the emission timing of the laser beam LG that has an optical axis shift with respect to the red laser beam LR that is the reference laser beam, based on the recognition result of the optical axis shift.
  • the image drawing apparatus 1 includes the red laser LD1, the blue laser LD2, and the green laser LD3.
  • the MEMS mirror 10 scans each of the combined light beams within the scannable region SR including the drawing region RR.
  • the light receiving element 100 receives each of the laser beams LR, LB, and LG that are scanned in the non-drawing region in the scannable region SR.
  • the video ASIC 3 detects the deviation of each spot center of the laser beams LR, LB, LG based on the output signal of the light receiving element 100.
  • the video ASIC 3 emits all of the light beams at the timing when the light receiving element 100 receives each of the laser beams LR, LB, LG, and the light receiving element 100 transmits each of the received laser beams LR, LB, LG.
  • a detection signal Sd corresponding to the intensity is output.
  • the image drawing apparatus 1 detects the optical axis shift of each laser beam based on the detection signal Sd of the light receiving element 100 when the laser beams LR, LB, and LG are simultaneously emitted.
  • the optical axis deviation can be detected with high accuracy without being affected.
  • FIG. 7 shows a view of the light receiving element 100A according to the second embodiment observed from the direction indicated by the arrow Z in FIG.
  • the light receiving element 100A is different from the first embodiment in that the light receiving element 100A has two block regions B1 and B2 arranged in line symmetry in the vertical direction.
  • the video ASIC 3 detects the optical axis deviation in the vertical direction based on the difference in the light amount of each laser beam detected in each of the block regions B1 and B2 in addition to the optical axis deviation in the left-right direction.
  • the block areas B1 and B2 are an example of the “block of 2 rows and 1 column” in the present invention.
  • the red light receiving area Ar ⁇ b> 1 and the red light receiving area Ar ⁇ b> 2 exist at positions that are line symmetric with respect to the horizontal axis 70 ⁇ / b> H that is a broken line parallel to the horizontal direction.
  • the green light receiving area Ag1 and the green light receiving area Ag2 are axisymmetric with respect to the horizontal axis 70H as the symmetry axis, and the blue light receiving area Ab1 and the blue light receiving area Ab2 are line symmetric.
  • the region where the laser beam photometry with a smaller spot diameter is performed is arranged at a position closer to the horizontal axis 70H.
  • the blue light receiving area Ab1 and the blue light receiving area Ab2 that measure the blue laser light LB with the smallest spot diameter are arranged at positions closest to the horizontal axis 70H.
  • the red light receiving area Ar1 and the red light receiving area Ar2 for measuring the red laser beam LR having the largest spot diameter are arranged at positions farthest from the horizontal axis 70H.
  • the light receiving element 100 can suitably measure the laser beams of all colors.
  • the video ASIC 3 recognizes the optical axis position of each laser beam in the vertical direction with respect to the horizontal axis 70H based on the difference in the light amount of each laser beam detected in each block area B1, B2. Thereby, the video ASIC 3 preferably recognizes the direction and width of the optical axis deviation in the vertical direction of each laser beam. Also, the video ASIC 3 detects the optical axis shift of each laser beam in the left-right direction, for example, the light reception start time or / and the light reception end time of each light receiving area in the block area B1 or the block area B2, as in the first embodiment. Calculate based on
  • FIG. 8 shows a state in which the light receiving element 100A is irradiated with the spots Sr and Sb of the laser beams LR and LB.
  • the spot Sg of the laser beam LG is not shown for convenience of explanation.
  • FIG. 9 shows an output waveform of the light receiving element 100A in the example of FIG.
  • the graph “Gr1” indicates the temporal change in the amount of light detected by the red light receiving area Ar1 from the time “Tr11” to the time “Tr12”
  • the graph “Gr2” indicates the amount of light detected by the red light receiving area Ar2. Shows time change.
  • the graph “Gb1” shows the temporal change in the amount of light detected by the blue light receiving area Ab1 from the time “Tb11” to the time “Tb12”
  • the graph “Gb2” shows the time change in the amount of light detected by the blue light receiving area Ab2.
  • the video ASIC 3 calculates a direction and a shift width shifted from the horizontal axis 70H with respect to the optical axis of each laser beam. Specifically, in the video ASIC 3, the maximum value of the red laser light LR detected by the red light receiving area Ar1 is wider than the maximum value of the red laser light LR detected by the red light receiving area Ar2 as indicated by the arrow 71. Recognize only big. In this case, in the video ASIC 3, the center of the spot Sr is shifted from the horizontal axis 70H in the direction of the red light receiving area Ar1 where the light amount is large (that is, upward), and the shift width corresponds to the width indicated by the arrow 71.
  • the video ASIC 3 obtains the deviation width of the optical axis from the width indicated by the arrow 71, for example, for each laser beam of each color, the relationship between the difference in the maximum amount of light and the deviation width from the horizontal axis 70H is shown.
  • a map or expression to be shown is stored in advance in the ROM 5 or the like, and the map or the like is referred to.
  • the maximum value of the blue laser light LB detected by the blue light receiving area Ab2 is larger by the width indicated by the arrow 72 than the maximum value of the blue laser light LB detected by the blue light receiving area Ab1. Recognize that.
  • the center of the spot Sr is shifted from the horizontal axis 70 ⁇ / b> H in the direction of the blue light receiving area Ab ⁇ b> 2 where the light amount is large (that is, the downward direction), and the shift width corresponds to the width indicated by the arrow 72. Recognize points that are widths.
  • the video ASIC 3 can suitably calculate the position of the optical axis of each color in the vertical direction from the horizontal axis 70H. Thereafter, the video ASIC 3 may correct the optical axes of all the laser beams so as to coincide with the horizontal axis 70H, and the optical axes of all the laser beams coincide with the optical axes of the reference laser beams. The position of the optical axis of laser light other than the laser light may be corrected.
  • the video ASIC 3 when calculating the deviation between the optical axis of the red laser light LR and the optical axis of the blue laser light LB in the left-right direction, is a block area as in the first embodiment.
  • the optical axis deviation is calculated based on the light reception timing of each laser beam in B1 or the block area B2.
  • the video ASIC 3 includes the light reception start time Tr11 or / and the light reception end time Tr12 of the red laser light LR in the block region B1, and the light reception start time Tb11 and / or the light reception end time Tb12 of the blue laser light LB in the block region B1. Based on the above, as in the first embodiment, the direction and width of the optical axis misalignment in the horizontal direction of these laser beams are calculated.
  • the video ASIC 3 performs the vertical direction based on the difference in the light amount of each laser beam detected in each of the block regions B1 and B2 of the light receiving element 100A in addition to the optical axis shift in the horizontal direction. Can be detected and corrected appropriately.
  • FIG. 10 shows a view of the light receiving element 100B according to the third embodiment observed from the direction indicated by the arrow Z in FIG.
  • the light receiving element 100B is different from the first and second embodiments in that it has four block regions B1 to B4 arranged in line symmetry in the vertical and horizontal directions.
  • the video ASIC 3 detects the optical axis deviation in the left-right direction and the up-down direction based on the light-receiving timing and the light-receiving amount of each laser beam in each of the block areas B1 to B4.
  • the block areas B1 to B4 are examples of the “block of 2 rows and 2 columns” in the present invention.
  • a red light receiving area Ar1 and a red light receiving area Ar2 a green light receiving area Ag1 and a green light receiving area Ag2, a blue light receiving area Ab1 and a blue light receiving area Ab2, and a red light receiving area with a horizontal axis 70H parallel to the left and right direction as symmetry axes.
  • Ar3 and the red light receiving area Ar4, the green light receiving area Ag3 and the green light receiving area Ag4, and the blue light receiving area Ab3 and the blue light receiving area Ab4 exist at positions that are line-symmetric.
  • the red light receiving area Ar1 and the red light receiving area Ar3, the green light receiving area Ag1 and the green light receiving area Ag3, the blue light receiving area Ab1 and the blue light receiving area Ab3, and the red light receiving area Ar2 The red light-receiving area Ar4, the blue light-receiving area Ab2, the blue light-receiving area Ab4, the green light-receiving area Ag2, and the green light-receiving area Ag4 are present at positions that are line-symmetric.
  • the region where the laser light with a smaller spot diameter is measured is arranged at a position closer to the horizontal axis 70H.
  • the blue light receiving areas Ab1 to Ab4 for measuring the blue laser light LB having the smallest spot diameter are arranged at positions closest to the horizontal axis 70H.
  • the red light receiving areas Ar1 to Ar4 for measuring the red laser beam LR having the largest spot diameter are arranged at positions farthest from the horizontal axis 70H.
  • the video ASIC 3 detects the timing at which the centers of the spots Sr, Sg, and Sb overlap on the vertical axis 70V (also referred to as “first timing TgH”) based on the amount of light in the block areas B1 to B4 for each laser beam. Then, the optical axis deviation in the left-right direction is recognized based on the timing difference.
  • the video ASIC 3 has the maximum “R1 + R2 + R3 + R4” and the timing that satisfies the following expression (1). Is detected as the first timing TgH.
  • the video ASIC 3 detects the first timing TgH in the same manner for the green laser beam LG and the blue laser beam LB. Then, the video ASIC 3 recognizes the direction and width of the optical axis shift in the left-right direction based on the difference between the first timings TgH. In this case, for example, the video ASIC 3 stores in advance a map or expression indicating the relationship between the difference in the first timing TgH and the deviation width of the optical axis in the ROM 5 or the like, and refers to the map or the like to change the optical axis. The deviation width is calculated.
  • the video ASIC 3 has a timing (also referred to as “second timing TgV”) where the centers of the spots Sr, Sg, and Sb overlap on the horizontal axis 70H based on the amount of light in the block areas B1 to B4 for each laser beam. Each is detected, and the optical axis shift in the vertical direction is recognized based on the difference in the second timing TgV.
  • second timing TgV also referred to as “second timing TgV”
  • the video ASIC 3 detects “R1 + R2 + R3 + R4” at the maximum and satisfies the following expression (2).
  • the video ASIC 3 also detects the second timing TgV for the green laser beam LG and the blue laser beam LB.
  • the video ASIC 3 recognizes the direction and width of the optical axis shift in the vertical direction based on the difference between the second timings TgV.
  • the video ASIC 3 stores in advance a map or expression indicating the relationship between the difference in the second timing TgV and the deviation width of the optical axis in the ROM 5 or the like, and refers to the map or the like to change the optical axis.
  • the deviation width is calculated.
  • the video ASIC 3 does not calculate the second timing TgV, but the difference in the amount of laser light in the block areas B1 and B2 or the laser in the block areas B3 and B4, as in the second embodiment.
  • An optical axis shift in the vertical direction may be recognized by calculating the distance of the optical axis from the horizontal axis 70H based on the difference in the amount of light.
  • the video ASIC 3 preferably detects and corrects the optical axis misalignment in the vertical direction and the horizontal direction based on the photometric results in the block regions B1 to B4 of the light receiving element 100B. Can do.
  • the image drawing apparatus 1 may further include an optical element that deforms the spots Sr, Sb, and Sg into an elliptical shape having a major axis in the vertical direction.
  • FIG. 11A shows a part of the configuration of the image drawing apparatus 1 according to the modification.
  • a reflective diffuser 200 is provided in the vicinity of the microlens array 94.
  • the reflective diffuser 200 reflects the light incident from the MEMS mirror 10 in the direction in which the light receiving element 100 exists.
  • FIG. 11B is a diagram in which the microlens array 94 and the reflective diffuser 200 are observed from the direction of the arrow Z.
  • the reflective diffuser 200 is provided in the scannable region SR outside the drawing target region RR.
  • FIG. 12 is a front view of the light receiving element 100 irradiated with the laser beams LR, LG, and LB in the configuration of FIG.
  • the spots Sr, Sg, and Sb of the laser beams of the respective colors are elliptical shapes each having a major axis in the vertical direction.
  • the spots Sr, Sg, Sb are elliptical, the light reception start time due to the difference in the size of the spot diameter due to the wavelength of the color of the beam and the difference in the arrangement of the light receiving areas as compared with the case where the spot is circular. The error is small.
  • the video ASIC 3 can measure the light reception start time with high accuracy by reducing the above-described error. Therefore, in this modification, the video ASIC 3 can improve the detection accuracy of the optical axis deviation in the left-right direction.
  • this modification is suitably applied even when the light receiving element 100A according to the second embodiment and the light receiving element 100B according to the third embodiment are used. Even in these cases, the video ASIC 3 can improve the detection accuracy of the optical axis deviation in the left-right direction.
  • the image drawing apparatus 1 detects and corrects the optical axis deviation with the red laser LD1, the blue laser LD2, and the green laser LD3 turned on simultaneously.
  • the method to which the present invention is applicable is not limited to this.
  • the image drawing apparatus 1 simultaneously turns on two of the red laser LD1, the blue laser LD2, and the green laser LD3, and detects and corrects the optical axis deviation of these two laser beams. May be.
  • the image drawing apparatus 1 first turns on the red laser LD1 and the blue laser LD2 at the same time, and corrects the optical axis shift of these two laser beams LR and LB. Thereafter, the image drawing apparatus 1 turns on either the red laser LD1 or the blue laser LD2 and the green laser LD3 at the same time, thereby shifting the optical axes of the red laser light LR, the blue laser light LB, and the green laser light LG. to correct.
  • the image drawing apparatus 1 can preferably correct the optical axis shift of the red laser light LR, the blue laser light LB, and the green laser light LG. In another example, the image drawing apparatus 1 may correct the optical axis deviation for four or more lasers.
  • FIG. 13 shows a configuration example of a head-up display according to the present invention.
  • the head-up display shown in FIG. 13 makes the driver visually recognize the virtual image “Iv” via the combiner 26.
  • the light source unit 1A functions as the image drawing device 1 of the above-described embodiment.
  • the light source section 1A is attached to the ceiling section 22 in the passenger compartment via the support members 11a and 11b, and includes map information including the current location, route guidance information, traveling speed, and other information for assisting driving (hereinafter referred to as “driving assistance”).
  • driving assistance information for assisting driving
  • Light constituting a display image indicating “information” is emitted toward the combiner 26.
  • the light source unit 1A generates an original image (real image) of the display image in the light source unit 1 and emits light constituting the image to the combiner 26, thereby allowing the driver to visually recognize the virtual image Iv. .
  • the combiner 26 projects the display image emitted from the light source unit 1 and reflects the display image to the driver's viewpoint (eye point) “Pe” to display the display image as a virtual image Iv. And the combiner 26 has the support shaft part 27 installed in the ceiling part 22, and rotates the support shaft part 27 as a spindle.
  • the support shaft portion 27 is installed, for example, in the vicinity of the ceiling portion 22 near the upper end of the front window 20, in other words, in the vicinity of a position where a sun visor (not shown) for the driver is installed.
  • the configuration of the head-up display to which the present invention is applicable is not limited to this.
  • the head-up display does not include the combiner 26, and the light source unit 1A may reflect the display image on the front window 20 to the driver's eye point Pe by projecting the light onto the front window 20.
  • the position of the light source unit 1 ⁇ / b> A is not limited to being installed on the ceiling unit 22, and may be installed inside the dashboard 24.
  • the dashboard 24 is provided with an opening for allowing light to pass through the combiner 26 or the front window 20.
  • the light receiving elements 100, 100 ⁇ / b> A, and 100 ⁇ / b> B were capable of photometry for three colors of RGB.
  • the configuration of the light receiving element to which the present invention is applicable is not limited to this.
  • the light receiving element may be a plurality of light receiving elements in which a light receiving element that measures red light, a light receiving element that measures blue light, and a light receiving element that measures green light are combined.
  • Image drawing device 3 Video ASIC 7 Laser driver ASIC 8 MEMS control unit 9 Laser light source unit 100, 100A, 100B Light receiving element

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Mechanical Optical Scanning Systems (AREA)

Abstract

La présente invention concerne un dispositif de rendu d'image (1) doté d'un laser rouge (LD1), d'un laser bleu (LD2) et d'un laser vert (LD3). Un miroir MEMS (10) balaye les faisceaux de lumière combinés dans une région de balayage (SR) contenant une région de rendu (RR). Un élément récepteur de lumière (100) reçoit les lumières laser (LR, LB, LG) respectives balayées dans la région hors-rendu à l'intérieur de la région de balayage (SR). Un ASIC vidéo (3) détecte des écarts dans les centres des spots des lumières laser (LR, LB, LG) sur la base d'un signal de sortie émanant de l'élément récepteur de lumière (100). Ensuite, l'ASIC vidéo (3) fait en sorte que tous les faisceaux de lumière individuels sont émis selon une synchronisation telle que l'élément récepteur de lumière (100) reçoit chacune des lumières laser (LR, LB, LG), et l'élément récepteur de lumière (100) émet un signal de sortie correspondant à l'intensité de chacune des lumières laser (LR, LB, LG) reçues.
PCT/JP2013/059878 2013-04-01 2013-04-01 Dispositif de projection et affichage tête haute Ceased WO2014162415A1 (fr)

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Cited By (1)

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US20190285875A1 (en) * 2018-03-19 2019-09-19 Ricoh Company, Ltd. Optical scanning device, image display apparatus, and movable object

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JP2005242036A (ja) * 2004-02-27 2005-09-08 Canon Inc 画像投射装置、および画像投射装置の制御方法
JP2010249966A (ja) * 2009-04-14 2010-11-04 Hitachi Ltd 光学エンジン
JP4809507B1 (ja) * 2010-11-30 2011-11-09 パイオニア株式会社 レーザ光源ユニット及び画像表示装置
WO2012120589A1 (fr) * 2011-03-04 2012-09-13 パイオニア株式会社 Dispositif de rendu d'image, programme de contrôle de rendu, et dispositif de détection d'écart d'axe optique
WO2013035142A1 (fr) * 2011-09-05 2013-03-14 パイオニア株式会社 Dispositif de correction de décalage d'axe optique, procédé de commande, et affichage tête haute

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JP2005242036A (ja) * 2004-02-27 2005-09-08 Canon Inc 画像投射装置、および画像投射装置の制御方法
JP2010249966A (ja) * 2009-04-14 2010-11-04 Hitachi Ltd 光学エンジン
JP4809507B1 (ja) * 2010-11-30 2011-11-09 パイオニア株式会社 レーザ光源ユニット及び画像表示装置
WO2012120589A1 (fr) * 2011-03-04 2012-09-13 パイオニア株式会社 Dispositif de rendu d'image, programme de contrôle de rendu, et dispositif de détection d'écart d'axe optique
WO2013035142A1 (fr) * 2011-09-05 2013-03-14 パイオニア株式会社 Dispositif de correction de décalage d'axe optique, procédé de commande, et affichage tête haute

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Publication number Priority date Publication date Assignee Title
US20190285875A1 (en) * 2018-03-19 2019-09-19 Ricoh Company, Ltd. Optical scanning device, image display apparatus, and movable object
EP3543763A1 (fr) * 2018-03-19 2019-09-25 Ricoh Company, Ltd. Dispositif de balayage optique, appareil d'affichage d'images et objet mobile
US10962767B2 (en) 2018-03-19 2021-03-30 Ricoh Company, Ltd. Optical scanning device, image display apparatus, and movable object

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