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WO2013035142A1 - Dispositif de correction de décalage d'axe optique, procédé de commande, et affichage tête haute - Google Patents

Dispositif de correction de décalage d'axe optique, procédé de commande, et affichage tête haute Download PDF

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Publication number
WO2013035142A1
WO2013035142A1 PCT/JP2011/070147 JP2011070147W WO2013035142A1 WO 2013035142 A1 WO2013035142 A1 WO 2013035142A1 JP 2011070147 W JP2011070147 W JP 2011070147W WO 2013035142 A1 WO2013035142 A1 WO 2013035142A1
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WO
WIPO (PCT)
Prior art keywords
optical axis
scanning
light
light receiving
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.)
Ceased
Application number
PCT/JP2011/070147
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English (en)
Japanese (ja)
Inventor
英昭 鶴見
雄一 吉田
純也 村田
福田　雅文
和弥 笹森
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Pioneer Corp
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Pioneer Corp
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Priority to PCT/JP2011/070147 priority Critical patent/WO2013035142A1/fr
Publication of WO2013035142A1 publication Critical patent/WO2013035142A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • 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
    • G02B26/12—Scanning systems using multifaceted mirrors
    • G02B26/127—Adaptive control of the scanning light beam, e.g. using the feedback from one or more detectors

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 an optical axis deviation correction apparatus, a control method, and a head-up display capable of detecting and correcting an optical axis deviation without being affected by external factors such as vibration. To do.
  • an optical axis misalignment correction apparatus that corrects an optical axis misalignment between a first beam emitted from a first light source and a second beam emitted from a second light source.
  • Scanning means for scanning the scanning area over a predetermined scanning period with the one light source and the second light source turned on at the same time, and receiving the first beam and the second beam scanned in the scanning area
  • a light receiving element arranged at a certain position, and the light receiving element that receives the first beam or the second beam from the earliest time when the light receiving element receives light from the first beam or the second beam during the scanning period.
  • the first bi It characterized in that it has a correction means for correcting the optical axis deviation between the beam and the second beam, the.
  • the optical axis shift between the first beam emitted from the first light source and the second beam emitted from the second light source is corrected, and the first light source and the second light source are adjusted.
  • Scanning means that scans the scanning region over a predetermined scanning period in a state in which the light is turned on at the same time, and a light receiving element that is disposed at a position capable of receiving the first beam and the second beam scanned in the scanning region
  • a control method executed by the optical axis deviation correction apparatus comprising: the first beam or the first beam or the second beam from the earliest point in time during which the light receiving element receives light from the first beam or the second beam.
  • a detecting step for detecting a deviation direction of the optical axes of the first beam and the second beam, and detecting by the detecting step Misalignment Based on, and having a correction step of correcting the optical axis deviation between the first beam and the second beam.
  • a head having an optical axis deviation correction device for correcting an optical axis deviation between the first beam emitted from the first light source and the second beam emitted from the second light source in the light source unit.
  • the optical axis misalignment correcting device scans a scanning region over a predetermined scanning period in a state where the first light source and the second light source are turned on simultaneously, and the scanning A light receiving element disposed at a position capable of receiving the first beam and the second beam scanned in a region, and a first light received by the light receiving element from the first beam or the second beam during the scanning period; Based on the width of the light receiving period from the time point to the last time point when the light receiving element receives the first beam or the second beam, the direction of deviation of the optical axes of the first beam and the second beam is detected. detection And stage, based on the deviation direction detected by said detecting means, and having a correction means for correcting the optical axis deviation between the first
  • FIG. 1 shows a configuration of an image drawing apparatus according to the present 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.
  • It is a graph which shows the time change of the light reception level which a light receiving element detects.
  • It is a graph which shows the time change of the light reception level which the light receiving element detects in the light reception period when the optical axis deviation has not arisen.
  • It is a flowchart which shows the outline
  • an optical axis deviation correction device that corrects an optical axis deviation between a first beam emitted from a first light source and a second beam emitted from a second light source, Scanning means for scanning the scanning region over a predetermined scanning period with the first light source and the second light source turned on simultaneously, and the first beam and the second beam scanned in the scanning region
  • the light receiving element disposed at a position capable of receiving light, and the first beam or the second beam from the earliest time when the light receiving element receives light from the first beam or the second beam during the scanning period.
  • the detecting means for detecting the deviation direction of the optical axis of the first beam and the second beam, and the deviation direction detected by the detecting means Before It has a correcting means for correcting the optical axis deviation of the first beam and the second beam, the.
  • the optical axis deviation correction device corrects an optical axis deviation between the first beam emitted from the first light source and the second beam emitted from the second light source, and includes a scanning unit, a light receiving element, and a detecting unit. And a correction means.
  • the scanning unit scans the scanning region over a predetermined scanning period with the first light source and the second light source turned on simultaneously.
  • the light receiving element is disposed at a position where the first beam and the second beam scanned in the scanning region can be received.
  • the detecting means is the width of the light receiving period from the earliest time when the light receiving element receives the first beam or the second beam to the last time when the light receiving element receives the first beam or the second beam during the scanning period. Based on the above, the deviation directions of the optical axes of the first beam and the second beam are detected.
  • the correction unit corrects the optical axis shift between the first beam and the second beam based on the shift direction detected by the detection unit.
  • the optical axis deviation correction apparatus has a width of the above-described light receiving period in accordance with the deviation direction of the optical axis when the optical axis deviation occurs, compared to the case where the optical axis deviation occurs. Since it becomes longer, detection and correction of the optical axis deviation are performed based on the width of the light receiving period. Further, the optical axis deviation correction device detects the optical axis deviation by simultaneously turning on the first beam and the second beam in order to eliminate the influence of the deviation of the received light caused by external factors such as vibration. Therefore, the optical axis deviation correction apparatus can detect and correct the optical axis deviation between the first beam and the second beam with high accuracy without being affected by vibration or the like due to the above-described configuration.
  • the correction means detects the optical axis deviation between the first beam and the second beam in the main scanning direction when the width of the light receiving period is a predetermined value or more. If the width of the light receiving period is less than the predetermined value, the optical axis deviation between the first beam and the second beam in the sub-scanning direction is corrected.
  • the optical axis deviation correction apparatus can reliably detect and correct the optical axis deviation in the main scanning direction.
  • the correcting unit corrects the optical axis deviation of the first beam or the second beam so that the width of the light receiving period is shortened.
  • the optical axis deviation correction device preferably corrects the optical axis deviation by correcting the optical axis deviation so that the width of the light receiving period is shortened when the optical axis deviation occurs. Can do.
  • the correction unit corrects the optical axis deviation by controlling the light emission timing of the first light source or the second light source in the scanning period.
  • the optical axis deviation correction apparatus can preferably correct the optical axis deviation so that the width of the light receiving period is shortened when the optical axis deviation occurs.
  • the scanning unit may include the first beam and the first beam at predetermined intervals between frames constituting an image drawn by the first beam and the second beam.
  • a frame for scanning the second beam with respect to the scanning region is inserted, and the scanning region is provided outside the region where the image is drawn.
  • the optical axis deviation correction apparatus can prevent the observer from visually recognizing the influence even when the optical axis deviation temporarily increases in the process of correcting the optical axis deviation.
  • the correction unit increases the adjustment amount of the light emission timing of the first light source or the second light source as the width of the light receiving period is longer. According to this aspect, the optical axis deviation correction apparatus can complete the correction of the optical axis deviation at an early stage.
  • the optical axis shift between the first beam emitted from the first light source and the second beam emitted from the second light source is corrected, and the first light source and the second light source are corrected.
  • the optical axis deviation correction apparatus can accurately detect and correct the optical axis deviation between the first beam and the second beam without being affected by vibration or the like.
  • an optical axis deviation correction apparatus that corrects an optical axis deviation between the first beam emitted from the first light source and the second beam emitted from the second light source.
  • a head-up display in a light source unit wherein the optical axis deviation correction device scans a scanning region over a predetermined scanning period with the first light source and the second light source turned on simultaneously.
  • the head-up display can detect and correct the optical axis deviation between the first beam and the second beam emitted from the light source unit with high accuracy without being affected by vibration or the like.
  • FIG. 1 shows a configuration of an image drawing apparatus 1 to which an optical axis deviation correction 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 MEMS control unit 8 and the laser driver ASIC 7 function as irradiation control means.
  • 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 arbitrary two laser beams of the lasers LD1, LD2, and LD3 are examples of the “first light source” and the “second light source” in the present invention, and the arbitrary two laser beams of the laser beams LR, LB, and LG. Are examples of the “first beam” and the “second beam” in the present invention.
  • 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 is configured by a photoelectric conversion element such as a photodetector, and supplies a detection signal “Sd”, which is an electrical signal corresponding to the amount of incident laser light, to the video ASIC 3.
  • 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. Thus, the video ASIC 3 functions as “detection means” and “correction 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 diagram 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 in the scannable area SR and is provided below 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 so as not to disturb the 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 it is located in the scannable area SR and corresponds to an area outside the drawing area RR.
  • the optical axis deviation correcting method As hereinafter, the optical axis deviation correcting method according to the present embodiment will be specifically described.
  • the image drawing apparatus 1 simultaneously turns on lasers of all colors 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”). In this state, scanning is performed, and the optical axis deviation is detected and corrected based on the time width when the light receiving element 100 receives the laser beam.
  • 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 arranged 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 arranged 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 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.
  • the scanning region Rtag is repeatedly scanned 6 times according to an interval of 60 FPS (that is, about 16.7 ms) in a state where any one of the lasers LD1, LD2, and LD3 is turned on. It is the figure which represented on the time axis the light reception level which the light receiving element 100 detected in the case. 4A, in each scanning period for the scanning region Rtag, a period in which the light receiving element 100 detects light reception intermittently, that is, a period from the first light reception time to the last light reception time (“light reception period”). (Also referred to as “T”) indicates that the light reception level is high.
  • FIG. 4B is a graph showing details of the light receiving level in the light receiving period T with respect to the first scanning period of FIG. 4A.
  • the laser light is detected by the light receiving element 100 at every timing when scanning is performed on the scanning line at a position overlapping the light receiving element 100.
  • the light receiving element 100 detects the laser beam in scanning with each scanning line. Even when any one of the laser beams LR, LB, and LG is turned on, the width of the light receiving period T for each laser beam (also referred to as “monochromatic light receiving time width Tw1”) is the same.
  • FIG. 5A shows a temporal change in the light receiving level of the light receiving element 100 when scanning is performed with the red laser LD1, the blue laser LD2, and the green laser LD3 turned on simultaneously.
  • FIG. 5B is a graph obtained by extracting only the light receiving level for the red laser light LR in the case shown in FIG. 5A
  • FIG. 5C shows only the light receiving level for the blue laser light LB.
  • FIG. 5D is a graph obtained by extracting only the light reception level with respect to the green laser light LG.
  • the light receiving element 100 detects the respective laser beams at the same timing, so that the respective laser beams LR and LB are detected. , LG coincides with the light receiving period T.
  • the light receiving period T in which the light receiving element 100 detects the laser light when scanning is performed with the lasers LD1 to LD3 turned on simultaneously, only for one laser light. Coincides with the received light receiving period T. Accordingly, as shown in FIGS.
  • all-color light receiving time width Twa Is the same length as the monochromatic light reception time width Tw1.
  • FIG. 6A shows a temporal change in the light reception level when the MEMS mirror 10 is scanned by simultaneously turning on the red laser LD1, the blue laser LD2, and the green laser LD3.
  • FIG. 6B is a graph obtained by extracting only the light reception level for the red laser light LR in the case shown in FIG. 6A
  • FIG. 6C shows only the light reception level for the blue laser light LB.
  • FIG. 6D is an extracted graph, in which only the light reception level for the green laser light LG is extracted.
  • the light receiving period T of the light receiving element 100 for each laser beam is significantly different. Specifically, for example, when the blue laser beam LB is used as a reference, the red laser beam LR is shifted downward, so that the timing detected by the light receiving element 100 is earlier. Similarly, when the blue laser beam LB is used as a reference, since the green laser beam LG is shifted upward, the timing detected by the light receiving element 100 is delayed.
  • the light receiving period T in which the light receiving element 100 detects the laser light when scanning is performed with the lasers LD1 to LD3 turned on simultaneously targets only one laser light.
  • the all-color light reception time width Twa is longer than the single color light reception time width Tw1.
  • the optical axis deviation occurs only in the left-right direction (sub-scanning direction) because the light receiving element 100 detects light reception on the same scanning line. Compared to the case, the shift of the light receiving period T is small. Therefore, when the optical axis deviation occurs only in the sub-scanning direction, the difference between the all-color light reception time width Twa and the single-color light reception time width Tw1 is smaller than when the optical axis deviation occurs in the main scanning direction. .
  • the image drawing apparatus 1 calculates the all-color light reception time width Twa based on the detection signal of the light receiving element 100, and the monochromatic light reception time corresponding to the all-color light reception time width Twa when no optical axis deviation occurs. The difference from the width Tw1 is obtained. Then, when the difference is larger than a predetermined threshold (also referred to as “first threshold”), the image drawing apparatus 1 determines that an optical axis shift in the main scanning direction has occurred.
  • a predetermined threshold also referred to as “first threshold”
  • the above first threshold is an example of the “predetermined value” in the present invention, and is set to a value larger than the difference between the all-color light reception time width Twa and the single-color light reception time width Tw1 caused by the optical axis shift only in the sub-scanning direction. Is set.
  • the first threshold value is set to the light receiving interval (that is, the width of the arrow “Ax” in FIG. 4B) within the light receiving period T when only one laser is turned on to scan the scanning region Rtag. .
  • FIG. 7 is an example of a flowchart showing a procedure of optical axis deviation correction processing executed by the image drawing apparatus 1.
  • the flowchart shown in FIG. 7 is repeatedly executed according to a predetermined cycle or timing.
  • the image drawing apparatus 1 may perform the optical axis misalignment correction process when drawing a video in the drawing region RR.
  • the image drawing apparatus 1 measures the all-color light reception time width Twa (step S101). For example, the image drawing apparatus 1 designates a predetermined range including the entire light receiving element 100 arranged in the scannable region SR as the scan region Rtag, and performs scanning in a state where all color laser lights are turned on. At this time, the width of the light receiving period T from the time when the light receiving element 100 first detects the laser light to the time when the laser light is finally detected is determined as the all-color light receiving time width Twa.
  • the image drawing apparatus 1 determines whether or not the all-color light reception time width Twa is larger than the single color light reception time width Tw1 by the first threshold (step S102).
  • the image drawing apparatus 1 stores in advance a single color light reception time width Tw1, in other words, the all color light reception time width Twa (see FIG. 5) when no optical axis deviation occurs in a memory or the like.
  • the first threshold value is set, for example, as a lower limit value of the difference between the all-color light reception time width Twa and the single-color light reception time width Tw1 when the optical axis shift occurs in the main scanning direction. This is determined experimentally or theoretically in consideration of the time width required to scan the dots on the scanning line, the position of the light receiving element 100, and the like.
  • step S102 When the all-color light reception time width Twa is larger than the single color light reception time width Tw1 by the first threshold value (step S102; Yes), the image drawing apparatus 1 determines that the optical axis shift in the main scanning direction has occurred, The optical axis deviation in the main scanning direction (vertical direction) is corrected (step S103). This specific process will be described later with reference to FIG.
  • step S102 when the deviation width between the all-color light reception time width Twa and the single color light reception time width Tw1 is less than the first threshold (step S102; No), the image drawing apparatus 1 has no optical axis deviation in the main scanning direction. And the process proceeds to step S104.
  • step S104 the image drawing apparatus 1 determines whether or not the all color light reception time width Twa is greater than the single color light reception time width Tw1 by a second threshold or more (step S104).
  • the second threshold is set to a lower limit value or the like of the difference between the all-color light reception time width Twa and the monochrome light reception time width Tw1 when the optical axis shift occurs in the sub-scanning direction.
  • the time width required to scan the minutes (for example, 23.2 us when scanning 720 pixels at 60 FPS) is set. Therefore, the second threshold value is set to a value smaller than the first threshold value described above.
  • step S104 When the all-color light reception time width Twa is larger than the single color light reception time width Tw1 by the second threshold or more (step S104; Yes), the image drawing apparatus 1 determines that an optical axis shift in the sub-scanning direction has occurred, Optical axis deviation correction in the sub-scanning direction (left-right direction) is performed (step S105). This specific processing will be described later with reference to FIG.
  • step S104 when the deviation width between the all-color light reception time width Twa and the single color light reception time width Tw1 is less than the second threshold (step S104; No), the image drawing apparatus 1 has no optical axis deviation in the sub-scanning direction. And the process of the flowchart is terminated.
  • the image drawing apparatus 1 when the optical axis deviation occurs in the main scanning direction, the all-color light reception time width Twa and the single color are compared with the case where the optical axis deviation occurs in the sub-scanning direction. Focusing on the fact that the difference from the light reception time width Tw1 increases, the direction of the optical axis deviation is detected based on these differences.
  • the image drawing apparatus 1 first corrects the optical axis deviation in the main scanning direction, and then appropriately corrects the optical axis deviation in the sub-scanning direction. Thereby, the image drawing apparatus 1 can preferably correct the optical axis deviation in the main scanning direction and the sub-scanning direction.
  • the image drawing apparatus 1 detects the optical axis deviation by simultaneously turning on the lasers LD1 to LD3 to be inspected, thereby eliminating the influence of the deviation of the received light caused by external factors such as vibration. To do. Therefore, the image drawing apparatus 1 can detect and correct the optical axis deviation with high accuracy without being affected by vibration or the like.
  • FIG. 8 is a flowchart showing an example of the procedure of main scanning direction optical axis deviation correction processing.
  • the image drawing apparatus 1 executes the processing of the flowchart shown in FIG. 8 when the processing proceeds to step S103 in FIG. Schematically, the image drawing apparatus 1 monitors the all-color light reception time width Twa so that the difference between the all-color light reception time width Twa and the single-color light reception time width Tw1 is less than the first threshold. Feedback control is performed to move the optical axis in the main scanning direction.
  • the image drawing apparatus 1 determines a laser that moves the optical axis (step S201). For example, the image drawing device 1 fixes (references) the optical axis position of one laser (for example, the red laser beam LR) of the red laser beam LR, the blue laser beam LB, and the green laser beam LG to another laser.
  • the other lasers blue laser light LB and green laser light LG in the above example
  • the other lasers are alternately designated as laser light that moves the optical axis every time step S201 is executed. To do.
  • the image drawing apparatus 1 moves the optical axis of the laser designated in step S201 in the upward direction, and then performs scanning in a state where the laser beams of all colors are turned on for the scanning region Rtag.
  • the color light reception time width Twa is measured (step S202).
  • the above-described movement width is set to a width corresponding to one dot, for example.
  • the image drawing apparatus 1 determines whether or not the all-color light reception time width Twa has increased (step S203). Specifically, the image drawing apparatus 1 determines whether or not the all-color light reception time width Twa measured in step S202 is larger than the all-color light reception time width Twa measured before that.
  • step S203 the image drawing apparatus 1 determines that the optical axis of the moved laser is not shifted upward, and lowers the optical axis of the laser. Then, the light reception time width Twa of all colors is measured again (step S204).
  • this movement width is set to a width twice the movement width in step S202 (for example, a width corresponding to 2 dots), and immediately after step S205. In this case, for example, it is set to be the same as the movement width in step S202 (one dot width).
  • the image drawing apparatus 1 determines whether or not the all-color light reception time width Twa has decreased (step S205).
  • the image drawing apparatus 1 determines that there is a possibility that the target laser is still shifted downward, and step S202 is performed again. Perform the process.
  • the image drawing apparatus 1 moves the optical axis of the laser light determined in step S201 upward to move the all-color light reception time width. Twa is measured again (step S206), and the process proceeds to step S211.
  • the movement width in this case is set to be the same as the movement width in step S204 (for example, a width for one dot).
  • step S203 determines whether or not the all-color light reception time width Twa has decreased (step S203). S207).
  • the image drawing apparatus 1 determines that there is a possibility that the optical axis of the target laser beam is further shifted upward. Then, the optical axis of the laser beam is moved upward, and then the all-color light reception time width Twa is measured again (step S208).
  • This movement width is set to be the same as the movement width in step S202 (one dot width), for example.
  • the image drawing apparatus 1 determines whether or not the all-color light reception time width Twa has decreased (step S209).
  • the image drawing apparatus 1 determines that there is a possibility that the optical axis of the target laser beam is still shifted upward. Then, the process of step S208 is performed again.
  • the image drawing apparatus 1 moves the optical axis of the target laser downward to remeasure the all-color light reception time width Twa. (Step S210), and the process proceeds to Step S211.
  • the movement width in this case is set to be the same as the movement width in step S208 (for example, a width for one dot).
  • step S207 if it is determined in step S207 that the all-color light reception time width Twa has not decreased (step S207; No), that is, if it is determined that the all-color light reception time width Twa has not increased or decreased, the image drawing apparatus 1 advances the process to step S211. In this case, the image drawing apparatus 1 may return the optical axis of the target laser downward by the amount that the optical axis is moved upward in step S202.
  • step S211 the image drawing apparatus 1 determines whether the difference between the all-color light reception time width Twa and the single color light reception time width Tw1 is less than the first threshold (step S211). Thereby, the image drawing apparatus 1 determines whether or not the deviation of the optical axis in the main scanning direction has been eliminated. If the difference between the all-color light reception time width Twa and the single color light reception time width Tw1 is less than the first threshold (step S211; Yes), the image drawing apparatus 1 determines that the optical axis shift in the main scanning direction is eliminated, The process of the flowchart ends.
  • step S211 when the difference between the all-color light reception time width Twa and the single color light reception time width Tw1 is equal to or larger than the first threshold value (step S211; No), the image drawing apparatus 1 does not eliminate the deviation of the optical axis in the main scanning direction. And the process returns to step S201. In this case, in step S201, the image drawing apparatus 1 selects a laser beam that is different from the laser beam whose optical axis was moved last time as a target for moving the optical axis.
  • FIG. 9 is a flowchart illustrating an example of a procedure of sub-scanning direction optical axis deviation correction processing.
  • the image drawing apparatus 1 executes the processing of the flowchart shown in FIG. 9 when the processing proceeds to step S105 in FIG. Schematically, the image drawing apparatus 1 monitors each color light reception time width Twa so that the deviation width between the all color light reception time width Twa and the single color light reception time width Tw1 is less than the second threshold. Feedback control for moving the optical axis in the sub-scanning direction is performed.
  • the image drawing apparatus 1 determines a laser that moves the optical axis (step S301). For example, the image drawing device 1 fixes (references) the optical axis position of one laser (for example, the red laser beam LR) of the red laser beam LR, the blue laser beam LB, and the green laser beam LG to another laser.
  • the other lasers blue laser light LB and green laser light LG in the above example
  • the other lasers are alternately designated as laser light that moves the optical axis every time step S301 is executed. To do.
  • the image drawing apparatus 1 moves the optical axis of the laser designated in step S301 in the right direction, and then performs scanning in a state where all color laser lights are turned on for the scanning region Rtag.
  • the color light reception time width Twa is measured (step S302).
  • the above-described movement width is set to a width corresponding to one dot, for example.
  • the image drawing apparatus 1 determines whether or not the all-color light reception time width Twa has increased (step S303). Specifically, the image drawing apparatus 1 determines whether or not the all-color light reception time width Twa measured in step S302 is larger than the all-color light reception time width Twa measured before that.
  • step S303 the image drawing apparatus 1 determines that the optical axis of the moved laser is not shifted to the right, and moves the optical axis of the laser to the left. Then, the all-color light reception time width Twa is measured again (step S304). In the case immediately after the optical axis is moved in the right direction in step S302, this movement width is set to a width twice the movement width in step S302 (for example, a width corresponding to 2 dots), and immediately after step S305. In this case, for example, it is set to the same movement width (one dot width) in step S302.
  • the image drawing apparatus 1 determines whether or not the all-color light reception time width Twa has decreased (step S305). If the all-color light reception time width Twa decreases (step S305; Yes), the image drawing apparatus 1 determines that there is a possibility that the target laser is still shifted leftward, and step S302 is performed again. Perform the process. On the other hand, when the all-color light reception time width Twa does not decrease (step S305; No), the image drawing apparatus 1 moves the optical axis of the laser light determined in step S301 to the right to shift the all-color light reception time width. Twa is measured again (step S306), and the process proceeds to step S311. In this case, the movement width is set to be the same as the movement width in step S304 (for example, a width corresponding to one dot).
  • step S303 determines whether or not the all-color light reception time width Twa has decreased (step S303). S307).
  • the image drawing apparatus 1 determines that there is a possibility that the optical axis of the target laser beam is further shifted to the right. Then, the optical axis of the laser beam is moved to the right, and then the all-color light reception time width Twa is measured again (step S308).
  • This movement width is set to be the same as the movement width in step S302 (one dot width), for example.
  • the image drawing apparatus 1 determines whether or not the all-color light reception time width Twa has decreased (step S309).
  • the image drawing apparatus 1 determines that there is a possibility that the optical axis of the target laser beam is still shifted to the right. Then, the process of step S308 is performed again.
  • the image drawing apparatus 1 moves the optical axis of the target laser in the left direction to remeasure the all-color light reception time width Twa. (Step S310), and the process proceeds to step S311.
  • the movement width is set to be the same as the movement width in step S308 (for example, a width corresponding to one dot).
  • step S307 determines whether the all-color light reception time width Twa has not decreased (step S307; No), that is, if it is determined that the all-color light reception time width Twa has not increased or decreased.
  • the image drawing apparatus. 1 advances the process to step S311. In this case, the image drawing apparatus 1 may return the optical axis of the target laser to the left as much as the optical axis is moved to the right in step S302.
  • step S311 the image drawing apparatus 1 determines whether or not the difference between the all-color light reception time width Twa and the single color light reception time width Tw1 is less than the second threshold (step S311). Thereby, the image drawing apparatus 1 determines whether or not the deviation of the optical axis in the sub-scanning direction has been eliminated.
  • step S311 the image drawing apparatus 1 determines that the optical axis shift in the sub-scanning direction is eliminated, The process of the flowchart ends.
  • step S311 when the difference between the all-color light reception time width Twa and the single color light reception time width Tw1 is equal to or greater than the second threshold value (step S311; No), the image drawing apparatus 1 has not eliminated the optical axis shift in the sub-scanning direction. And the process returns to step S301. In this case, in step S301, the image drawing apparatus 1 selects a laser beam different from the laser beam whose optical axis has been moved last time as a target for moving the optical axis.
  • 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.
  • the image drawing apparatus 1 may correct the optical axis deviation for four or more lasers. Even in this case, the image drawing device 1 measures the all-color light reception time width Twa by simultaneously lighting them, and based on the all-color light reception time width Twa, the optical axis deviation correction in the main scanning direction or / and Optical axis deviation correction in the sub-scanning direction is performed.
  • Modification 2 In the image drawing apparatus 1, in the above-described optical axis misalignment correction processing in the main scanning direction or optical axis misalignment correction processing in the sub-scanning direction, the movement width for moving the optical axis is set to the all-color light reception time width Twa and the single color light reception time width Tw1. You may change according to the difference.
  • the image drawing apparatus 1 uses the difference between the all-color light reception time width Twa and the single color light reception time width Tw1. Is larger, the above-mentioned movement width, that is, the adjustment amount of the light emission timing is increased. Specifically, the image drawing apparatus 1 creates a map of the difference between the all-color light reception time width Twa and the single color light reception time width Tw1 and the movement width to be set based on an experiment in advance and stores it in the memory. The above-described movement width is set with reference to the map. By doing so, the image drawing apparatus 1 can complete the correction of the optical axis deviation more quickly.
  • the image drawing apparatus 1 performs scanning using one frame per second as the above-described inspection frame and a region outside the drawing region RR and including the light receiving element 100 as the scanning region Rtag. Then, the image drawing apparatus 1 moves the optical axis of the specific laser beam so as to reflect only the inspection frame in the optical axis deviation correction process described above, so that the optical axis deviation is reduced. Specify the direction and width of movement. By doing in this way, the image drawing apparatus 1 does not affect the image visually recognized by the observer even when the optical axis deviation temporarily increases as a result of moving the optical axis. Deviation correction can be performed.
  • Modification 4 The above-described image drawing apparatus 1 is preferably applied to a head-up display. A specific example of this will be described with reference to FIG.
  • FIG. 10 shows a configuration example of a head-up display according to the present invention.
  • the head-up display shown in FIG. 10 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 present invention can be used for various video devices using RGB lasers, such as laser projectors, head-up displays, and head-mounted displays.
  • Image drawing device 3 Video ASIC 7 Laser driver ASIC 8 MEMS control unit 9 Laser light source unit 100 Light receiving element

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Optical Scanning Systems (AREA)

Abstract

Ce dispositif de correction de décalage d'axe optique comprend un moyen de balayage (10), un élément de réception de lumière (100), un moyen de détection, et un moyen de correction permettant de corriger un décalage d'axe optique d'un premier faisceau rayonné par une première source lumineuse et d'un deuxième faisceau rayonné par une deuxième source lumineuse. Le moyen de balayage (10) conduit le premier et le deuxième balayage de faisceaux dans une région de balayage pendant une période de balayage prescrite dans un état où la première source lumineuse et la deuxième source lumineuse sont activées simultanément. Le moyen de détection détecte la direction de décalage pour les axes optiques du premier faisceau et du deuxième faisceau sur la base des limites d'une période de réception de lumière comprise entre le premier temps où le premier faisceau ou le deuxième faisceau est reçu par l'élément de réception de lumière (100) et le temps final où le premier faisceau ou le deuxième faisceau est reçu par l'élément de réception de lumière (100). Le moyen de correction corrige le décalage d'axe optique pour le premier faisceau et le deuxième faisceau sur la base de la direction de décalage détectée par le moyen de détection.
PCT/JP2011/070147 2011-09-05 2011-09-05 Dispositif de correction de décalage d'axe optique, procédé de commande, et affichage tête haute Ceased WO2013035142A1 (fr)

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WO2014162500A1 (fr) * 2013-04-02 2014-10-09 パイオニア株式会社 Unite de source de lumiere et dispositif de projection
WO2014162415A1 (fr) * 2013-04-01 2014-10-09 パイオニア株式会社 Dispositif de projection et affichage tête haute

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JPH06303623A (ja) * 1993-04-15 1994-10-28 Matsushita Electric Ind Co Ltd 陰極線管制御装置
JP2010020087A (ja) * 2008-07-10 2010-01-28 Funai Electric Co Ltd 画像表示装置
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WO2014162415A1 (fr) * 2013-04-01 2014-10-09 パイオニア株式会社 Dispositif de projection et affichage tête haute
WO2014162500A1 (fr) * 2013-04-02 2014-10-09 パイオニア株式会社 Unite de source de lumiere et dispositif de projection
JP5878673B2 (ja) * 2013-04-02 2016-03-08 パイオニア株式会社 光源ユニット、及び投影装置

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