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WO2013145154A1 - Dispositif de dessin d'image - Google Patents

Dispositif de dessin d'image Download PDF

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Publication number
WO2013145154A1
WO2013145154A1 PCT/JP2012/058138 JP2012058138W WO2013145154A1 WO 2013145154 A1 WO2013145154 A1 WO 2013145154A1 JP 2012058138 W JP2012058138 W JP 2012058138W WO 2013145154 A1 WO2013145154 A1 WO 2013145154A1
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WO
WIPO (PCT)
Prior art keywords
light
optical axis
light source
axis deviation
laser
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/JP2012/058138
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English (en)
Japanese (ja)
Inventor
克宏 小池
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
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Pioneer Corp
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Filing date
Publication date
Application filed by Pioneer Corp filed Critical Pioneer Corp
Priority to PCT/JP2012/058138 priority Critical patent/WO2013145154A1/fr
Publication of WO2013145154A1 publication Critical patent/WO2013145154A1/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
    • 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
    • G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors

Definitions

  • the present invention relates to a technical field for detecting and correcting an optical axis shift.
  • Patent Document 1 This type of technology is proposed in Patent Document 1, for example.
  • Japanese Patent Application Laid-Open No. 2004-133620 proposes a technique for making a laser beam from a light source enter a light receiving element and detecting an optical axis shift based on an output signal of the light receiving element.
  • Patent Document 1 proposes correcting an optical axis deviation by moving an optical element (a lens or a beam splitter) based on the detected optical axis deviation.
  • Examples of the problem to be solved by the present invention include the above. It is an object of the present invention to provide an image drawing apparatus that can appropriately prevent light from being visually recognized when detecting an optical axis shift.
  • the image drawing apparatus causes the drawing target to draw an image by scanning the first light source, the second light source, and the light emitted from the first light source and the second light source.
  • Scanning means optical axis deviation detecting means for detecting deviation of an optical axis of light emitted from the first light source and the second light source and not scanned by the scanning means, and the first light source
  • an optical axis correction unit that corrects the optical axis of the light emitted from the second light source to coincide with each other, and the first light source, the second light source, and the scanning unit during the detection operation by the optical axis deviation detection unit.
  • a light shielding means for interrupting the optical path between the two.
  • FIG. 1 shows a configuration of an image drawing apparatus according to a first embodiment.
  • the structure of a light-receiving part is shown.
  • the figure for demonstrating concretely the filter non-insertion state and filter insertion state which concern on 1st Example is shown.
  • the figure for demonstrating the 1st control example of 1st Example is shown.
  • the figure for demonstrating the 2nd control example of 1st Example is shown.
  • the figure for demonstrating the 3rd control example of 1st Example is shown.
  • the structure of the image drawing apparatus which concerns on 2nd Example is shown.
  • the figure for demonstrating concretely the mirror insertion state and mirror non-insertion state which concern on 2nd Example is shown.
  • the structure of the image drawing apparatus which concerns on 3rd Example is shown.
  • the figure for demonstrating concretely the S polarization state and P polarization state which concern on 3rd Example is shown.
  • an image drawing apparatus scans light emitted from a first light source, a second light source, the first light source, and the second light source, and draws an image on a drawing target.
  • Means optical axis deviation detecting means for detecting an optical axis deviation of light emitted from the first light source and the second light source and not scanned by the scanning means, the first light source,
  • An optical axis correction unit configured to correct the optical axes of the light emitted from the second light source, and the first light source, the second light source, and the scanning unit during a detection operation by the optical axis deviation detection unit;
  • Light shielding means for blocking the optical path between the two.
  • the image drawing apparatus detects a shift in the optical axis of the light emitted from the first light source and the second light source, and corrects the optical axes of the light emitted from the first light source and the second light source to coincide with each other.
  • the light blocking means blocks the optical path between the first light source and the second light source and the scanning means during the detection operation by the optical axis deviation detecting means.
  • the image drawing apparatus has an optical path to the scanning unit and an optical path to the optical axis deviation detecting unit, and blocks only the optical path to the scanning unit when detecting the optical axis deviation (optical axis). The optical path to the deviation detection means is not blocked).
  • the deflection angle of the scanning means By the way, by controlling the deflection angle of the scanning means to be larger than that during normal operation, it is possible to suppress the light from being visually recognized at the time of detecting the optical axis deviation, but the control should be performed at an arbitrary timing. It is difficult.
  • the image drawing apparatus blocks the optical path in front of the scanning unit, the image drawing apparatus can perform the blocking at an arbitrary timing.
  • the light shielding unit is disposed in an optical path between the first light source and the second light source and the optical axis deviation detecting unit, and guides the light to the scanning unit.
  • a control means for performing control to remove the light guide means from the optical path between the first light source and the second light source and the optical axis deviation detection means during the detection operation by the optical axis deviation detection means.
  • the optical axis deviation when the optical axis deviation is not detected, light is incident only on the scanning means by the light guiding means, and no light is incident on the optical axis deviation detecting means.
  • the light guide means is removed from the optical path, so that light is incident only on the optical axis deviation detection means, and no light is incident on the scanning means. Thereby, it can prevent appropriately that the light at the time of detection of optical axis deviation is visually recognized.
  • the light from the first light source and the second light source is incident on one of the scanning unit and the optical axis deviation detecting unit without being divided, so that the light use efficiency is improved. It becomes possible to make it.
  • the light shielding unit is disposed in an optical path between the first light source, the second light source, and the optical axis deviation detection unit, and has a predetermined polarization direction.
  • a beam splitter that reflects light to the scanning means and allows light having a polarization direction other than the predetermined polarization direction to pass therethrough, and changes the polarization direction of the light from the first light source and the second light source, and changes the polarization direction.
  • a liquid crystal element that emits light toward a beam splitter, and the liquid crystal so that light from the first light source and the second light source has a polarization direction other than the predetermined polarization direction at the time of detection operation by the optical axis deviation detection unit.
  • Control means for controlling the element, and the optical axis deviation detecting means detects deviation of the optical axis of the light that has passed through the beam splitter.
  • the liquid crystal element when the optical axis deviation is not detected, the liquid crystal element is controlled to emit light having a predetermined polarization direction, and the light emitted from the liquid crystal element is reflected by the beam splitter and scanned. Incident on the means.
  • the liquid crystal element when the optical axis deviation is detected, the liquid crystal element is controlled so as to emit light having a polarization direction other than the predetermined polarization direction, and the light emitted from the liquid crystal element passes through the beam splitter. The light passes through and enters the optical axis deviation detecting means. In this case, no light is incident on the scanning means. Thereby, it can prevent appropriately that the light at the time of detection of optical axis deviation is visually recognized. Further, according to the image drawing apparatus described above, since the mechanical drive unit is not used, the apparatus can be reduced in size.
  • FIG. 1 shows a configuration of an image drawing apparatus 1a according to the first embodiment.
  • the image drawing apparatus 1a according to the first embodiment mainly 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, and a MEMS.
  • the mirror control part 8, the laser light source unit 9a, and the control part 20a are provided.
  • the image drawing device 1a is configured to be attachable to a head-up display for visually recognizing an image as a virtual image from the position (eye point) of the user, a user's head, and the like, and draws an image on the user's retina. Applies to head mounted displays.
  • the image drawing apparatus 1a can be applied to a projector using laser light, for example.
  • the laser light source unit 9a in FIG. 1 has shown the figure cut
  • 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 mirror control unit 8 based on the image signal input from the image signal input unit 2 and the scanning position information input from the MEMS mirror 10, and is ASIC (Application 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 converter 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 mirror 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 (LD) provided in a laser light source unit 9a to be 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 drive circuit 72 drives the blue laser LD2 based on the signal output from the light emission pattern conversion unit 33.
  • the green laser drive circuit 73 drives the green laser LD3 based on the signal output from the light emission pattern conversion unit 33.
  • a MEMS (Micro Electro Mechanical Systems) mirror control unit 8 controls the MEMS mirror 10 based on a signal output from the timing controller 34.
  • the MEMS mirror 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 9a mainly functions to emit laser light based on a drive signal output from the laser driver ASIC 7.
  • the laser light source unit 9a includes a red laser LD1, a blue laser LD2, a green laser LD3, collimator lenses 91a, 91b, and 91c, dichroic mirrors 92a and 92b, a beam splitter 14, and a MEMS mirror 10. And a light receiving unit 13 and a movable filter 15.
  • the red laser LD1 emits red laser light
  • the blue laser LD2 emits blue laser light
  • the green laser LD3 emits green laser light.
  • the red laser LD1, the blue laser LD2, and the green laser LD3 are simply referred to as “laser LD”, and the red laser light, the blue laser light, and the green laser light are used without being distinguished from each other. In this case, it is simply expressed as “laser light”.
  • the collimator lenses 91a, 91b, and 91c make the red laser light, the blue laser light, and the green laser light into parallel lights, respectively.
  • the dichroic mirror 92a reflects the red laser light passing through the collimator lens 91a and transmits the green laser light passing through the collimator lens 91c.
  • the dichroic mirror 92b transmits the red laser light and the green laser light that have passed through the dichroic mirror 92a, and reflects the blue laser light that has passed through the collimator lens 91b.
  • the beam splitter 14 divides the laser light emitted from the dichroic mirror 92b in this way, reflects a part of the laser light toward the MEMS mirror 10, and transmits the remaining part of the laser light.
  • the laser light transmitted through the beam splitter 14 is incident on the light receiving unit 13.
  • the MEMS mirror 10 When the movable filter 15 is not located in the optical path between the beam splitter 14 and the MEMS mirror 10, the MEMS mirror 10 receives the laser beam reflected by the beam splitter 14 and directs the laser beam toward the screen 11. Reflect. Specifically, the MEMS mirror 10 operates to scan the screen 11 with a laser beam under the control of the MEMS mirror control unit 8 in order to display an image input to the image signal input unit 2, and Scan position information at that time (for example, information such as a mirror angle) is output to the video ASIC 3.
  • the MEMS mirror 10 is an example of the “scanning unit” in the present invention.
  • the screen 11 is an example of the “drawing object” in the present invention.
  • the laser beam that has passed through the beam splitter 14 is incident on the light receiving unit 13.
  • the light receiving unit 13 is a photoelectric conversion element (for example, a four-divided light receiving element) such as a photodetector, and outputs a light receiving signal Sd1 corresponding to the light receiving position of the laser light to the video ASIC 3.
  • FIG. 2 is a view of the light receiving unit 13 observed from the direction of the arrow A1 in FIG.
  • the light receiving unit 13 includes four light receiving elements 13a to 13b, and a spot SP corresponding to the laser light transmitted through the beam splitter 14 is formed.
  • Each of the light receiving elements 13a to 13b outputs a signal corresponding to the area irradiated with the laser beam.
  • the light receiving unit 13 subtracts the value obtained by adding the output value of the light receiving element 13b and the output value of the light receiving element 13d from the value obtained by adding the output value of the light receiving element 13a and the output value of the light receiving element 13c, An X deviation signal indicating the optical axis deviation in the direction (left and right direction) is output.
  • the light receiving unit 13 subtracts the value obtained by adding the output value of the light receiving element 13c and the output value of the light receiving element 13d from the value obtained by adding the output value of the light receiving element 13a and the output value of the light receiving element 13b. , And output as a Y shift signal indicating the optical axis shift in the Y direction (vertical direction).
  • the light receiving unit 13 outputs a signal including such an X deviation signal and a Y deviation signal to the video ASIC 3 as the above-described light reception signal Sd1.
  • the video ASIC 3 detects the optical axis shift of the red laser LD1, the blue laser LD2, and the green laser LD3 based on the light reception signal Sd1 from the light receiving unit 13.
  • the video ASIC 3 is based on the light reception signal Sd1 for each of the red laser light, the blue laser light, and the green laser light obtained when the red laser LD1, the blue laser LD2, and the green laser LD3 are individually emitted.
  • the optical axis deviation for each laser LD is detected.
  • the video ASIC 3 performs processing for correcting the optical axis deviation based on the detected optical axis deviation.
  • the video ASIC 3 corrects the optical axis deviation by controlling the emission timing of the laser beam (that is, the modulation timing of the laser LD with respect to the movement of the MEMS mirror 10).
  • the light receiving unit 13 corresponds to an example of the “optical axis deviation detecting unit” in the present invention
  • the video ASIC 3 corresponds to an example of the “optical axis correcting unit” in the present invention.
  • the movable filter 15 is configured to be able to block the passage of laser light (can be blocked). As the movable filter 15, various known filters can be applied. Further, the movable filter 15 is controlled between the position in the optical path between the beam splitter 14 and the MEMS mirror 10 and the position outside the optical path as indicated by an arrow A2 under the control of the control unit 20a. It is configured to be movable.
  • FIG. 1 shows a state in which the movable filter 15 is disposed at a position off the optical path between the beam splitter 14 and the MEMS mirror 10 (hereinafter referred to as “filter non-insertion state”).
  • filter non-insertion state a state where the movable filter 15 is disposed in the optical path between the beam splitter 14 and the MEMS mirror 10
  • filter insertion state a state where the movable filter 15 is disposed in the optical path between the beam splitter 14 and the MEMS mirror 10 (hereinafter referred to as “filter insertion state”) is indicated by a broken line.
  • the control unit 20a performs control to move the movable filter 15 via an actuator (not shown). Specifically, when the optical axis deviation is detected, the control unit 20a performs control to place the movable filter 15 at a position where the filter is inserted, and when the optical axis deviation is not detected. Performs control to arrange the movable filter 15 at a position where the filter is not inserted.
  • the controller 20a controls the movable filter 15 based on a signal supplied from the video ASIC 3 and indicating whether or not to detect the optical axis deviation.
  • the movable filter 15 and the control unit 20a correspond to an example of the “light shielding unit” in the present invention.
  • FIG. 3 shows only the laser light source unit 9a.
  • FIG. 3A shows a filter non-insertion state.
  • the movable filter 15 is disposed at a position deviated from the optical path between the beam splitter 14 and the MEMS mirror 10.
  • the laser light reflected by the beam splitter 14 is incident on the MEMS mirror 10, so that the laser light is irradiated on the screen 11 by the MEMS mirror 10, that is, an image is displayed.
  • an image is displayed by setting in such a filter non-insertion state.
  • FIG. 3B shows a filter insertion state.
  • the filter insertion state is realized by moving the movable filter 15 as indicated by an arrow A3 from the position of the movable filter 15 in the filter non-insertion state shown in FIG.
  • the movable filter 15 is disposed in the optical path between the beam splitter 14 and the MEMS mirror 10.
  • the laser beam reflected by the beam splitter 14 is shielded by the movable filter 15 so that the laser beam is not incident on the MEMS mirror 10.
  • the screen 11 is not irradiated with laser light, that is, no image is displayed.
  • such a filter insertion state is set when an optical axis deviation is detected.
  • the drive mechanism can be simplified and the cost can be reduced.
  • the movable filter 15 is disposed in the optical path between the beam splitter 14 and the MEMS mirror 10 in the above. Instead, the movable filter 15 is disposed in the optical path between the MEMS mirror 10 and the screen 11. 15 may be arranged. This also prevents the laser light from reaching the screen 11 when detecting an optical axis shift. However, when the movable filter 15 is arranged in the optical path between the MEMS mirror 10 and the screen 11, the movable filter 15 is movable more than in the case where the movable filter 15 is arranged in the optical path between the beam splitter 14 and the MEMS mirror 10. It is necessary to increase the size of the filter 15.
  • the movable filter 15 covers a relatively wide scanning range of the laser light. It is necessary to have. Therefore, from the viewpoint of miniaturization of the movable filter 15 and the like, the optical filter between the beam splitter 14 and the MEMS mirror 10 is disposed rather than the movable filter 15 disposed in the optical path between the MEMS mirror 10 and the screen 11. It can be said that it is preferable to dispose the movable filter 15.
  • FIG. 4 shows a first control example related to the control method according to the first embodiment.
  • FIG. 4 shows a drive signal (vertical drive signal) for scanning the MEMS mirror 10 in the vertical direction and a control signal (filter control signal) for controlling the movable filter 15 used in the first control example.
  • FIG. 4 shows a vertical drive signal timing chart on the upper side and a filter control signal timing chart on the lower side.
  • the filter control signal is set to high level, the movable filter 15 is disposed at a position where the filter is inserted, and when the filter control signal is set to low level, the movable filter 15 is disposed at a position where the filter is not inserted. (The same shall apply hereinafter).
  • one frame immediately after activation of the image drawing apparatus 1a is assigned to detection and correction of the optical axis deviation.
  • the control unit 20a performs control to place the movable filter 15 at a position where the filter is inserted in a period corresponding to one frame immediately after activation.
  • the MEMS mirror control unit 8 drives the MEMS mirror 10 by a so-called sawtooth wave using a vertical drive signal whose level increases with time (this control is performed for normal image display).
  • the laser driver ASIC 7 performs control to individually emit the red laser LD1, the blue laser LD2, and the green laser LD3.
  • the video ASIC 3 detects the optical axis deviation for each laser LD based on the light reception signal Sd1 of the light receiving unit 13 for each of the red laser light, the blue laser light, and the green laser light, and detects the detected light. Processing for correcting the optical axis deviation is performed based on the axis deviation.
  • the control unit 20a places the movable filter 15 at a position where the filter is not inserted, and the video ASIC 3, the laser driver ASIC 7, and the MEMS mirror control unit 8 display an image to be presented to the user. Do normal control.
  • the detection and correction of the optical axis deviation is not limited to being performed immediately after the activation, and the optical axis deviation may be detected and corrected at regular intervals after the activation.
  • FIG. 5 shows a second control example related to the control method according to the first embodiment.
  • FIG. 5 shows a timing chart of vertical drive signals used in the second control example on the upper side, and shows a timing chart of filter control signals used in the second control example on the lower side.
  • a part of the period in each frame is assigned to the detection and correction of the optical axis deviation (in other periods, the detection is performed without detecting and correcting the optical axis deviation. Display the image that should be).
  • an example of control when detecting and correcting the optical axis deviation will be mainly described.
  • the control unit 20a performs control to place the movable filter 15 at a position where the filter is inserted in a partial period in each frame.
  • the laser driver ASIC 7 performs control to emit only one laser LD of the red laser LD1, blue laser LD2, and green laser LD3, and the video ASIC 3
  • the optical axis deviation for the laser LD is detected, and the optical axis deviation is detected based on the detected optical axis deviation. Processing for correction is performed.
  • the MEMS mirror control unit 8 drives the MEMS mirror 10 in a sawtooth wave regardless of whether or not optical axis deviation is detected and corrected.
  • the laser LD that detects and corrects the optical axis deviation is changed by changing the laser LD that emits light for each frame, and the optical axis deviation is detected and corrected in each frame.
  • the timing to perform (that is, the temporal position for detecting and correcting the optical axis deviation within one frame) is changed.
  • the first frame detects and corrects the optical axis deviation for the blue laser LD2 in the first predetermined period
  • the second frame detects the optical axis deviation for the green laser LD3 in the middle period.
  • the detection and correction of the optical axis deviation for the red laser LD1 is performed in the second half of the predetermined period, and the detection and correction of the optical axis deviation is not performed in the fourth frame. The same operation as in the first to fourth frames is repeated.
  • the correction frequency of the optical axis deviation can be increased as compared with the first control example.
  • the time required for detecting and correcting the optical axis deviation can be shortened, and no image is displayed. The period can be shortened.
  • the timing at which no image is displayed in each frame changes by changing the timing for detecting and correcting the optical axis deviation in each frame (that is, the image is displayed in the image drawing area). The uncomfortable feeling given to the user can be suppressed.
  • FIG. 6 shows a third control example related to the control method according to the first embodiment.
  • FIG. 6 shows a timing chart of vertical drive signals used in the third control example on the upper side, and shows a timing chart of filter control signals used in the third control example on the lower side.
  • a part of the period in each frame is assigned to the detection and correction of the optical axis deviation (in other periods, the detection is performed without detecting and correcting the optical axis deviation. Display the image that should be).
  • the third control example when the optical axis deviation is detected and corrected, scanning in the vertical direction by the MEMS mirror 10 is stopped.
  • an example of control when detecting and correcting the optical axis deviation will be mainly described.
  • the control unit 20a performs control to place the movable filter 15 at a position where the filter is inserted in the first half of each frame, and the MEMS mirror control unit 8 performs vertical control by the MEMS mirror 10. Control to stop scanning in the direction is performed. In this case, the MEMS mirror control unit 8 fixes the MEMS mirror 10 at an angle corresponding to the upper end or the lower end in the movable range of the MEMS mirror 10 in the vertical scanning direction.
  • the laser driver ASIC 7 controls to emit only one laser LD among the red laser LD1, the blue laser LD2, and the green laser LD3.
  • the video ASIC 3 detects the optical axis deviation for the laser LD based on the light reception signal Sd1 of the light receiving unit 13 for the laser LD emitted by the laser driver ASIC 7, and based on the detected optical axis deviation. Then, a process for correcting the optical axis deviation is performed.
  • the laser LD that detects and corrects the optical axis deviation is changed by changing the laser LD that emits light for each frame.
  • detection and correction of the optical axis deviation for the blue laser LD2 are performed in the first frame
  • detection and correction of the optical axis deviation for the green laser LD3 are performed in the second frame
  • red in the third frame.
  • the detection and correction of the optical axis deviation for the laser LD1 are performed, and the same operation as the first to third frames is repeated after the fourth frame.
  • the correction frequency of the optical axis deviation can be increased as in the second control example, and the laser LD for detecting and correcting the optical axis deviation can be changed for each frame.
  • the time required for detecting and correcting the optical axis deviation can be shortened.
  • the vertical drive direction of the MEMS mirror 10 can be used to the maximum for image display. . That is, an image drawing area (corresponding to an area where an image can be displayed by scanning the MEMS mirror 10) can be used to the maximum extent as an area for displaying an image.
  • the order of “blue laser LD2 ⁇ green laser LD3 ⁇ red laser LD1” is repeatedly used to detect and correct the optical axis deviation is shown.
  • the order of the three laser LDs for detecting and correcting the optical axis deviation may be changed every time the detection and correction of the optical axis deviation for the three laser LDs is completed, or the same order may be used without using such an order.
  • the detection and correction of the optical axis deviation for the laser LD may be continuously performed, or the laser LD for detecting and correcting the optical axis deviation may be determined at random.
  • FIG. 7 shows a configuration of an image drawing apparatus 1b according to the second embodiment.
  • Components having the same reference numerals as those in FIG. 1 have the same meaning, and description thereof is omitted.
  • the image drawing apparatus 1b according to the second embodiment includes a laser light source unit 9b instead of the laser light source unit 9a and a control unit 20b instead of the control unit 20a.
  • the laser light source unit 9b is different from the laser light source unit 9a according to the first embodiment in that a movable total reflection mirror 16 is provided instead of the beam splitter 14 and the movable filter 15.
  • the movable total reflection mirror 16 is controlled by the control unit 20b between the position in the optical path between the dichroic mirror 92b and the light receiving unit 13 and the position outside the optical path, as indicated by the arrow B1. It is configured to be movable.
  • the movable total reflection mirror 16 is configured to be able to totally reflect the incident laser light, and when arranged in the optical path between the dichroic mirror 92b and the light receiving unit 13, the laser from the dichroic mirror 92b. The light is totally reflected toward the MEMS mirror 10.
  • FIG. 7 shows a state in which the movable total reflection mirror 16 is arranged in the optical path between the dichroic mirror 92b and the light receiving unit 13 (hereinafter referred to as “mirror insertion state”).
  • mirror insertion state shows a state in which the movable total reflection mirror 16 is arranged in the optical path between the dichroic mirror 92b and the light receiving unit 13 (hereinafter referred to as “mirror insertion state”).
  • mirror non-insertion state a state where the movable total reflection mirror 16 is disposed at a position deviated from the optical path between the dichroic mirror 92 b and the light receiving unit 13 (hereinafter referred to as “mirror non-insertion state”) is a broken line. Is shown.
  • the control unit 20b performs control to move the movable total reflection mirror 16 via an actuator (not shown). Specifically, when the optical axis deviation is detected, the control unit 20b performs control to place the movable total reflection mirror 16 at a position where the mirror is not inserted, and the optical axis deviation is detected. If not, control is performed to place the movable total reflection mirror 16 at a position where the mirror is inserted.
  • the controller 20b controls the movable total reflection mirror 16 based on a signal supplied from the video ASIC 3 and indicating whether or not to detect the optical axis deviation.
  • the movable total reflection mirror 16 and the control unit 20b correspond to an example of “light shielding means” in the present invention. Specifically, the movable total reflection mirror 16 corresponds to an example of a “light guide unit” in the present invention, and the control unit 20b corresponds to an example of a “control unit” in the present invention.
  • the mirror insertion state and the mirror non-insertion state will be specifically described with reference to FIG. In FIG. 8, only the laser light source unit 9b is illustrated.
  • FIG. 8A shows a mirror insertion state.
  • the movable total reflection mirror 16 is disposed in the optical path between the dichroic mirror 92b and the light receiving unit 13.
  • the laser light from the dichroic mirror 92b is reflected by the movable total reflection mirror 16 and is incident on the MEMS mirror 10, so that the laser light is irradiated on the screen 11 by the MEMS mirror 10, that is, an image. Will be displayed.
  • an image is displayed by setting in such a mirror insertion state.
  • the laser light from the dichroic mirror 92 b is totally reflected by the movable total reflection mirror 16, so that the laser light is not incident on the light receiving unit 13.
  • FIG. 8B shows a mirror non-inserted state.
  • the mirror non-insertion state is realized by moving the movable total reflection mirror 16 from the position of the movable total reflection mirror 16 in the mirror insertion state shown in FIG.
  • the movable total reflection mirror 16 is disposed at a position deviated from the optical path between the dichroic mirror 92b and the light receiving unit 13.
  • all the laser light from the dichroic mirror 92 b is incident on the light receiving unit 13, and no laser light is incident on the MEMS mirror 10.
  • the screen 11 is not irradiated with laser light, that is, no image is displayed.
  • such a mirror non-insertion state is set when an optical axis deviation is detected.
  • the second embodiment it is possible to appropriately prevent the laser beam from being visually recognized when detecting the optical axis deviation. That is, it is possible to appropriately prevent an image that is not intended to be presented to the user from being visually recognized.
  • the laser light from the dichroic mirror 92b is split by the beam splitter 14 and is incident on the MEMS mirror 10 and the light receiving unit 13.
  • the movable total reflection mirror is used. By using 16, all the laser light from the dichroic mirror 92b can be incident on the MEMS mirror 10 or the light receiving unit 13. Therefore, according to the second embodiment, it is possible to improve the light use efficiency compared to the first embodiment.
  • the first to third control examples shown in the first embodiment can be similarly applied to the second embodiment.
  • the mirror non-insertion state of the second embodiment corresponds to the filter insertion state of the first embodiment
  • the mirror insertion state of the second embodiment corresponds to the filter non-insertion state of the first embodiment.
  • the control of the movable total reflection mirror 16 may be performed by replacing the filter insertion state and the filter non-insertion state in FIG. 6 to the mirror non-insertion state and the mirror insertion state, respectively.
  • the third embodiment differs from the first and second embodiments in that a liquid crystal element (liquid crystal panel) and a polarizing beam splitter are used to prevent the laser light from reaching the screen 11 when detecting an optical axis shift.
  • a liquid crystal element liquid crystal panel
  • a polarizing beam splitter are used to prevent the laser light from reaching the screen 11 when detecting an optical axis shift.
  • Other points are the same as in the first embodiment. Therefore, components, control, processing, and the like that are not particularly described here are the same as those in the first embodiment.
  • FIG. 9 shows a configuration of an image drawing apparatus 1c according to the third embodiment. Components having the same reference numerals as those in FIG. 1 have the same meaning, and description thereof is omitted.
  • the image drawing apparatus 1c includes a laser light source unit 9c instead of the laser light source unit 9a and a control unit 20c instead of the control unit 20a.
  • the laser light source unit 9c is different from the laser light source unit 9a according to the first embodiment in that it includes a liquid crystal element 17 and a polarization beam splitter 18 instead of the beam splitter 14 and the movable filter 15.
  • the liquid crystal element 17 is disposed at a position where the laser light from the dichroic mirror 92b is incident.
  • the liquid crystal element 17 changes the polarization direction of the laser light under the control of the control unit 20c. Specifically, the liquid crystal element 17 emits either P-polarized light or S-polarized light according to liquid crystal drive control by the control unit 20c.
  • the polarizing beam splitter 18 is disposed at a position where the laser light from the liquid crystal element 17 is incident.
  • the polarization beam splitter 18 totally reflects the laser light toward the MEMS mirror 10 (this case is illustrated in FIG. 9).
  • the polarization beam splitter 18 transmits the laser light completely. In this case, all the laser light from the liquid crystal element 17 is incident on the light receiving unit 13 (this case is not shown in FIG. 9).
  • the control unit 20 c performs liquid crystal drive control on the liquid crystal element 17. Specifically, when the optical axis deviation is detected, the control unit 20c controls the liquid crystal element 17 to emit P-polarized light (hereinafter referred to as “P-polarized state”), and the optical axis. When the deviation is not detected, the liquid crystal element 17 is controlled so as to emit S-polarized light (hereinafter referred to as “S-polarized state”). The control unit 20c controls the liquid crystal element 17 based on a signal supplied from the video ASIC 3 and indicating whether or not to detect the optical axis deviation.
  • P-polarized state P-polarized light
  • S-polarized state S-polarized light
  • the liquid crystal element 17, the polarization beam splitter 18, and the control unit 20c correspond to an example of “light shielding means” in the present invention.
  • the polarization beam splitter 18 corresponds to an example of a “beam splitter” in the present invention
  • the control unit 20c corresponds to an example of a “control unit” in the present invention.
  • FIG. 10A shows the S polarization state.
  • the liquid crystal element 17 emits S-polarized light
  • the polarization beam splitter 18 totally reflects the S-polarized light toward the MEMS mirror 10.
  • the screen 11 is irradiated with laser light by the MEMS mirror 10, that is, an image is displayed.
  • an image is displayed by setting such an S-polarized state.
  • the laser light from the liquid crystal element 17 is totally reflected by the polarization beam splitter 18, so that the laser light is not incident on the light receiving unit 13.
  • FIG. 10B shows the P polarization state.
  • the liquid crystal element 17 emits P-polarized light, and the polarization beam splitter 18 totally transmits the P-polarized light.
  • the screen 11 is not irradiated with laser light, that is, no image is displayed.
  • such a P-polarized state is set when the optical axis deviation is detected.
  • the third embodiment it is possible to appropriately prevent the laser light from reaching the screen 11 when the optical axis deviation is detected. Therefore, according to the third embodiment, it is possible to appropriately prevent the laser beam from being visually recognized when the optical axis deviation is detected. That is, it is possible to appropriately prevent an image that is not intended to be presented to the user from being visually recognized. Also in the third embodiment, as in the second embodiment, since all the laser light from the dichroic mirror 92b can be incident on the MEMS mirror 10 or the light receiving unit 13, it is possible to improve the light utilization efficiency. Become. Furthermore, according to the third embodiment, since the mechanical drive unit as shown in the first and second embodiments is not used, it is advantageous in reducing the size of the apparatus.
  • the first to third control examples shown in the first embodiment can be similarly applied to the third embodiment.
  • the P-polarization state of the third embodiment corresponds to the filter insertion state of the first embodiment
  • the S-polarization state of the third embodiment corresponds to the filter non-insertion state of the first embodiment.
  • the liquid crystal element 17 may be controlled by replacing the filter insertion state and the filter non-insertion state in FIG. 6 with the P polarization state and the S polarization state, respectively.
  • the present invention can be used for various image drawing apparatuses such as a head-up display, a head-mounted display, and a projector.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Optical Scanning Systems (AREA)
PCT/JP2012/058138 2012-03-28 2012-03-28 Dispositif de dessin d'image Ceased WO2013145154A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004341210A (ja) * 2003-04-07 2004-12-02 Seiko Epson Corp プロジェクタ
JP2006276570A (ja) * 2005-03-30 2006-10-12 Seiko Epson Corp プロジェクタ及びレーザ機器の安全装置
JP2010197864A (ja) * 2009-02-26 2010-09-09 Hitachi Ltd 光軸調整装置、光軸調整方法及び投射型表示装置
JP2011007936A (ja) * 2009-06-24 2011-01-13 Hitachi Ltd 表示装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004341210A (ja) * 2003-04-07 2004-12-02 Seiko Epson Corp プロジェクタ
JP2006276570A (ja) * 2005-03-30 2006-10-12 Seiko Epson Corp プロジェクタ及びレーザ機器の安全装置
JP2010197864A (ja) * 2009-02-26 2010-09-09 Hitachi Ltd 光軸調整装置、光軸調整方法及び投射型表示装置
JP2011007936A (ja) * 2009-06-24 2011-01-13 Hitachi Ltd 表示装置

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