JP2019064513A - Virtual image display unit - Google Patents

Abstract

To provide a virtual image display unit that lets a user feel comfortable in viewing a virtual image.SOLUTION: An HUD device as a virtual image display device projects an image on a projection part to display a virtual image to be viewed. The HUD device comprises: a projector which projects display light of the image; a reflector 31 which holds a reflecting surface 32, reflecting the display light from the projector to a projection part side in an optical path, reaching the projection part from the projector, on the optical path; a drive output part 45, an output shaft-side gear 49 and a rotary shaft-side gear 40 which change the direction of the reflecting surface 32 by rotating the reflector 31 around a rotary shaft 35 provided to the reflector 31; and a stretched guide strip 38 and an engagement part 53 which move the reflector 31 itself associatively with the change in direction of the reflecting surface 32.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to a virtual image display device that displays a virtual image in a viewable manner.

  2. Description of the Related Art Conventionally, there is known a virtual image display device that displays a virtual image so that the image can be viewed visually by projecting an image on a projection unit. The device disclosed in Patent Document 1 includes a projector, a reflector, and a rotating unit. The projector projects the display light of the image. The reflector holds a reflection surface that reflects the display light from the projector to the projection unit side on the optical path on the light path from the projector to the projection unit. The rotating unit changes the direction of the reflecting surface by rotating the reflecting surface around the rotation axis. Here, the rotation axis is a tilt axis.

JP, 2016-206612, A

  Such a rotation unit is provided, for example, for position adjustment for moving the virtual image to a position easy for the viewer to see. In Patent Document 1, by adopting a tilt axis as a rotation axis, a phenomenon (so-called lateral shift) in which a virtual image is shifted in a direction different from an intended direction is suppressed when the reflecting surface is pivoted.

  However, in the case where the projection unit has a special shape such as, for example, a curved surface shape that has been divided, in many cases, lateral deviation can not be sufficiently corrected even if the tilt axis is adopted. Therefore, there is a need to reduce the discomfort of the occupant when adjusting the position of the virtual image by correcting the lateral displacement more accurately, and to enhance the comfort in visual recognition of the virtual image.

  One object disclosed is to provide a virtual image display device which is highly comfortable in visual recognition of a virtual image.

The virtual image display device disclosed herein is a virtual image display device for displaying a virtual image so that the image can be viewed visually by projecting the image onto the projection unit (4).
A projector (20) for projecting display light of an image;
A reflector (31, 231) for holding a reflective surface (32) for reflecting display light from the projector side to the projection unit side on an optical path (OP) from the projector to the projection unit;
A pivoting unit that changes the direction of the reflecting surface by pivoting the reflector around a rotation axis (35, 235) provided on the reflector;
And a moving unit for moving the reflector itself in conjunction with the change in the direction of the reflecting surface.

  According to such a virtual image display device, the reflector itself that holds the reflection surface moves in conjunction with the change in the direction of the reflection surface. In this way, when the direction of the reflection surface that reflects the display light from the projector toward the projection unit side is changed, the virtual image displacement (so-called lateral displacement) in a direction different from the intended direction is It can be corrected by movement. Thus, the virtual image can be moved linearly in the intended direction by correcting the lateral displacement more accurately. Therefore, the sense of discomfort to the occupant when adjusting the position of the virtual image can be reduced, and the comfort in visual recognition of the virtual image can be enhanced.

  In addition, the code | symbol in parentheses shows the correspondence with the part of embodiment mentioned later illustratively, Comprising: It is not intending limiting a technical scope.

It is a schematic diagram which shows the mounting state to the vehicle of the virtual image display apparatus of 1st Embodiment. It is a figure for demonstrating the cancellation of the projection part of 1st Embodiment. It is a schematic diagram for demonstrating schematic structure of the virtual image display apparatus of 1st Embodiment. It is a front view of the reflective unit of 1st Embodiment. It is a top perspective view of the reflection unit of 1st Embodiment. It is a perspective view which expands and shows a reflective unit of a 1st embodiment partially. It is a side view for demonstrating the engagement with the extending | stretching guide groove and engaging part in 1st Embodiment. It is a perspective view which expands and shows a reflective unit of a 1st embodiment partially. It is sectional drawing of the drive output part of 1st Embodiment. It is a schematic diagram for demonstrating the up-and-down motion of the display position of the virtual image of 1st Embodiment. It is a perspective view which shows the reflection unit of 2nd Embodiment. It is a block diagram for demonstrating the display position adjustment part of 1st Embodiment, a 1st drive output part, and a 2nd drive output part.

  Hereinafter, a plurality of embodiments will be described based on the drawings. In addition, the overlapping description may be abbreviate | omitted by attaching the same code | symbol to the corresponding component in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of the other embodiments described above can be applied to other parts of the configuration. In addition to the combinations of the configurations explicitly described in the description of each embodiment, the configurations of the plurality of embodiments can be partially combined with each other even if they are not explicitly specified unless any problem occurs in the combination. .

First Embodiment
As shown in FIG. 1, the virtual image display device according to the first embodiment of the present disclosure is used in a vehicle 1 and is a head-up display device housed in an instrument panel 2 of the vehicle 1 (hereinafter referred to as a HUD device Abbreviated as 100). The HUD device 100 projects an image toward the projection unit 4 set on the windshield 3 of the vehicle 1. As a result, the HUD device 100 displays a virtual image so that the image can be viewed visually by the occupant of the vehicle 1 as a viewer. That is, the display light of the image reflected by the projection unit 4 reaches the eye located in the viewing area EB in the passenger sitting on the seat 5 in the room of the vehicle 1, and the passenger is the virtual image VRI of the display light. To perceive. Examples of various information displayed as a virtual image as an image include information indicating the state of the vehicle 1 such as the vehicle speed and the remaining amount of fuel, or navigation information such as visibility auxiliary information and road information.

  In the following, unless stated otherwise, the front, rear, front-rear direction, upper, lower, vertical, left, right, and left-right directions are described with reference to the vehicle 1 on the horizontal plane HP.

  The visual recognition area EB is a space area that can be visually recognized so that the virtual image VRI displayed by the HUD device 100 satisfies a predetermined standard, and is also referred to as an eye box. Although the visual recognition area EB is typically set to overlap with the eye lip set in the vehicle 1, the visual recognition area EB can move in the vertical direction by position adjustment described later. The eyedrops are set in an ellipsoidal shape based on an eye range that statistically represents the distribution of eye points of the occupant.

  The overall shape of the vehicle 1 of the present embodiment is a streamlined shape like an egg. The windshield 3 is also formed in a curved plate shape that is curved according to the shape of the vehicle 1. In the vehicle 1 of the present embodiment, the driver's seat and the passenger's seat as the seat 5 are arranged side by side in the left-right direction of the vehicle, and the HUD device 100 displays a virtual image particularly for the occupant seated in the driver's seat. It has become.

  Therefore, as shown in FIG. 2, the projection unit 4 of the windshield 3 is set at a position decentered in the left-right direction with respect to the longitudinal central plane LMP of the vehicle 1 (for details, refer to JISD0102). With respect to such a projection part 4, windshield 3 itself is formed in symmetrical shape on both sides of vertical center plane LMP. As a result, the projection unit 4 is formed in a concave shape that is curved while being inclined so as to face the vertical center plane LMP side and the lower side in the left-right direction. More specifically, the windshield 3 is curved upward from the front with respect to the occupant so as to wrap the occupant.

  Here, in the present embodiment, at an arbitrary position of the projection unit 4, an angle formed by a virtual tangent plane of the projection unit 4 with respect to a virtual vertical plane VP orthogonal to the longitudinal central plane LMP is defined as a projection inclination angle θp. Do. Then, the projection inclination angle θp is changed so as to increase as going from the lower side to the upper side of the projection unit 4. For example, the projection inclination angle θp2 in the relatively upper part (see the broken line in FIG. 2) is larger than the projection inclination angle θp1 in the relatively lower part (see the solid line in FIG. 2) of the projection unit 4 ing.

  As shown in FIG. 3, the HUD device 100 that projects an image onto such a projection unit 4 is configured of a housing 10, a projector 20, a reflection unit 30, a control unit 70 and the like.

  The housing 10 has a hollow shape that accommodates the other elements of the HUD device 100 and is installed in the instrument panel 2 of the vehicle 1. The housing 10 has a window 11 at the upper side facing the projection unit 4. The window portion 11 is covered with a dustproof sheet 12 capable of transmitting display light.

  The projector 20 is, for example, a liquid crystal projector. The projector 20 is formed by housing the liquid crystal panel 21 and the backlight 22 in a casing 20 a. The projector 20 projects the display light contributing to the display of the image by transmitting and illuminating the screen of the liquid crystal panel 21 by the backlight 22. In addition, it is also possible to employ | adopt the laser scanner system etc. which form an image on a screen by scanning direction of the scanning mirror which a laser beam injects instead of liquid crystal type as projector 20. FIG.

  The reflection unit 30 is a unit that guides the display light to the projection unit 4 by reflecting the display light from the projector 20 as shown in FIGS. The reflection unit 30 includes a reflector 31, a drive output unit 45, a pair of supports 51, 55, and the like.

  The reflector 31 is formed in a rectangular plate shape, for example, of synthetic resin or glass. The reflector 31 holds a reflective surface 32 formed by depositing aluminum or the like on its surface, and the peripheral portion 33 excluding the reflective surface 32 is configured such that its surface is dark (for example, black) It has light absorption. The reflective surface 32 has a concave shape (more specifically, a free curved surface shape) in which the central portion is recessed. Thereby, the reflecting surface 32 is configured to reflect the display light from the side of the projector 20 to the side of the projection unit 4 on the optical path OP from the projector 20 to the projection unit 4, and simultaneously with the reflection. The display light is subjected to a magnifying action to magnify the virtual image VRI. In the present embodiment, the reflector 31 is disposed such that the reflective surface 32 faces the rear side of the vehicle 1. The display light reflected by the reflective surface 32 passes through the dustproof sheet 12 of the window 11 and travels to the projection unit 4. As the display light is reflected by the projection unit 4, the virtual image VRI is displayed as described above.

  The reflector 31 is a rotating shaft provided so as to penetrate the approximate center of the reflector 31 in the longitudinal direction, and a pair of axial elements projecting on the opposite side to the reflecting surface 32 at both sides of the reflector 31 It has a rotary shaft 35 positioned by 35a, 35b. The direction in which the shaft elements 35 a and 35 b are connected to each other corresponds to the axial direction AD of the rotation shaft 35. The axial direction AD of the present embodiment is disposed along the horizontal plane HP, but slightly intersects the vertical plane VP orthogonal to the longitudinal central plane LMP. The rotation shaft 35 rotates integrally with the reflector 31.

  One shaft element 35a has a small diameter portion 36 and a guide portion 37, as shown enlarged in FIGS. The small diameter portion 36 is integrally formed with the reflector 31, has a cylindrical shape smaller in diameter than the guide portion 37, and extends in the axial direction AD. The guide portion 37 is provided in a cylindrical or cylindrical shape in which the generatrix extends in the axial direction AD by fitting or integrally molding with the small diameter portion 36 at the tip end side of the small diameter portion 36.

  In the guide portion 37, a pair of extending guide strips 38 are provided at rotational symmetry positions which are two-phase symmetrical (in other words, 180 degrees symmetrical) with each other. Each extension guide strip 38 is formed in the shape of an elongated bottomed groove having a fixed width. Each stretching guide strip 38 is formed in a so-called spiral shape less than a half circumference by stretching around the rotation axis 35 with displacement in the axial direction AD.

  The other shaft element 35b is integrally formed, for example, by fitting with the main body of the reflector 31 and has a cylindrical portion 39 and a rotation shaft side gear 40, as shown enlarged in FIG. There is. The cylindrical portion 39 is formed in a cylindrical shape having substantially the same diameter as the small diameter portion 36. The rotary shaft side gear 40 is provided on the rotary shaft 35 side by integral molding with the cylindrical portion 39 closer to the reflective surface 32 side than the cylindrical portion 39, and has a receiving plate portion 41, a gear portion 42 and a flange portion 43. .

  The receiving plate portion 41 is disposed on the inner peripheral side of the rotation shaft side gear 40, and is formed in a thin plate shape extended on an orthogonal plane orthogonal to the axial direction AD. The receiving plate portion 41 abuts on a coil spring 58 described later, and receives a force from the coil spring 58.

  The gear portion 42 is disposed on the outer peripheral side of the receiving plate portion 41, and is formed in a fan-like shape thicker than the receiving plate portion 41. On the outer peripheral portion of the gear portion 42, a plurality of gear teeth 42a aligned with each other around the rotation shaft 35 are formed in a circular arc less than a half circumference. Each gear tooth 42a extends along the axial direction AD.

  The flange portion 43 is disposed adjacent to the gear tooth 42a positioned at the end among the arranged gear teeth 42a, and is formed in a flat rectangular piece shape protruding to the outer peripheral side in the radial direction.

  As shown in FIG. 9, the drive output unit 45 is mainly configured by a stepping motor 46 housed in a casing 45a, and is fixed to the housing 10 by being fastened with, for example, a screw. The stepping motor 46 is a permanent magnet type motor having a claw pole structure. In the stepping motor 46, when the coil 45b is energized by the drive signal and excited, the rotor magnet 45c rotates integrally with the motor shaft 45d.

  The drive output unit 45 is provided with a reduction gear mechanism 47 connected to the motor shaft 45 d. The reduction gear mechanism 47 is formed by meshing a plurality of transmission gears 47a to 47h in series. Specifically, the first gear 47a is formed on the motor shaft 45d. The first idler gear 47 b and the first pinion gear 47 c are supported integrally rotatably by a casing 45 a. The first idler gear 47b meshes with the first gear 47a, thereby decelerating the rotation of the motor shaft 45d and transmitting it to the first pinion gear 47c. The second idler gear 47d and the second pinion gear 47e are integrally rotatably supported by a casing 45a. The second idler gear 47d meshes with the first pinion gear 47c, thereby further decelerating the rotation of the gear 47c and transmitting it to the second pinion gear 47e. The third idler gear 47 f and the third pinion gear 47 g are supported integrally rotatably by a casing 45 a. The third idler gear 47 f meshes with the second pinion gear 47 e, thereby further decelerating the rotation of the gear 47 e and transmitting it to the third pinion gear 47 g. The final stage gear 47 h is formed on the output shaft 48 and meshes with the third pinion gear 47 g, thereby further decelerating the rotation of the gear 47 g and transmitting it to the output shaft 48.

  The output shaft 48 thus rotatably formed extends in a direction intersecting the axial direction AD, in particular, in the present embodiment, orthogonal to the axial direction AD, as shown in FIGS. An output shaft side gear 49 is provided outside the casing 45 a in the output shaft 48. The output shaft side gear 49 is a helical gear having helical bevel teeth 49a. The diameter of the pitch circle of the output shaft side gear 49 is set sufficiently smaller than the diameter of the pitch circle of the rotation shaft side gear 40. The output shaft side gear 49 meshes with the rotating shaft side gear 40 in a twisted state in a posture in which the tip end of the output shaft 48 is opposed to the flange portion 43.

  When the rotation is transmitted to the output shaft 48 by the reduction gear mechanism 47, the output shaft side gear 49 rotates integrally with the output shaft 48. As a result, the oblique teeth 49a are displaced upward or downward at the meshing position with the rotation shaft side gear 40, and the rotation shaft side gear 40 is rotated. The rotation shaft 35 integrally rotates with the rotation shaft side gear 40 by transmitting the rotation from the output shaft side gear 49.

  The reduction gear mechanism 47 forming the rotation transmission path, the output shaft side gear 49, and the rotation shaft side gear 40 transmit the rotation of the motor shaft 45d to the rotation shaft 35 by reduction, and the drive output unit 45 transmits the rotation shaft 35d to the rotation shaft 35. The rotation is output and the reflector 31 is rotated. The rotational drive around the rotation shaft 35 changes the orientation of the reflective surface 32 held by the reflector 31.

  The pair of supports 51 and 55 are individually provided corresponding to the shaft elements 35a and 35b of the rotation shaft 35, and are integrally provided in the present embodiment. Each of the supports 51 and 55 is a pedestal fixed to the housing 10 by, for example, pressing a metal plate. Each support 51 and 55 is fastened to the housing 10 by, for example, a screw. Each support 51, 55 supports the reflector 31 via the rotation shaft 35.

  The support 55 corresponding to the shaft element 35 b has a U-shaped support groove 56 opened upward, as shown in FIG. 8. The shaft element 35 a is rotatably supported by the support 55 by the cylindrical portions 39 of the shaft element 35 b being placed in contact with each other on the groove bottom 56 a formed in a semicircular shape in the support groove 56. There is. A helically wound coil spring 58 is disposed between the support 55 and the receiving plate portion 41 in a state of being inserted through the cylindrical portion 39. By the elastic reaction force of the coil spring 58, the reflector 31 is pressed to the side opposite to the coil spring 58 with an appropriate pressure via the receiving plate portion 41. Thus, the vibration of the reflector 31 (particularly, the reflection surface 32) when the vibration of the vehicle 1 is applied to the reflection unit 30 is absorbed, and the vibration of the virtual image VRI can be suppressed.

  The support 51 corresponding to the shaft element 35a has a support groove 52 opened upward as shown in FIG. In the support groove 52, the groove bottom 52a is formed in a round hole shape larger than the groove bottom 56a of the shaft element 35b in accordance with the diameter of the guide 37, so that the groove inlet 52b has a width relative to the groove bottom 52a. Is formed narrow. The guide portions 37 are inserted into the groove bottom portion 52a in a state where a gap is formed between them.

  As shown in FIG. 7, in the groove bottom portion 52a, a pair of protruding portions from the groove bottom portion 52a toward the center of the rotation shaft 35 with both positions that make approximately 90 degrees with the upper groove entrance portion 52b The engaging portion 53 is provided in a protruding manner. Each engaging portion 53 of the present embodiment is formed of, for example, metal in a round pin shape integral with the main body of the support 51, and thus has sufficient strength for supporting the guide portion 37. . Each engaging portion 53 individually corresponds to the extending guide bar 38 of the guide portion 37, and is engaged with the corresponding extending guide bar 38 in a state of being inserted into the corresponding extending guide bar 38. Thus, the shaft element 35 a is rotatably supported at two points by the pair of engaging portions 53 through the guide portion 37.

  Each engaging portion 53 is guided by the extending guide bar 38 by sliding the extending guide bar 38 along the extending direction of the extending guide bar 38 to be engaged as the rotation shaft 35 rotates. Here, as described above, since each extension guide strip 38 extends around the rotation axis 35 with displacement in the axial direction AD, the rotation axis 35 along with the slide of the engaging portion 53 in the extension guide strip 38. Moves relative to the housing 10 and the supports 51 and 55 in the axial direction AD. As a result, the reflector 31 itself moves in parallel along the axial direction AD.

  At this time, since the drive output portion 45 and the output shaft side gear 49 do not move relative to the housing 10, the rotary shaft side gear 40 moves relative to the output shaft side gear 49. Therefore, the meshing position of the rotation shaft side gear 40 with the output shaft side gear 49 is also shifted in the axial direction AD, but the tooth width Wt of each gear tooth 42a of the rotation shaft side gear 40 Since the total displacement amount Dsp in the axial direction AD between the portions 38a and 38b is larger, the meshing state can be maintained regardless of the movement of the reflector 31 (see FIG. 4).

  As shown in FIG. 3, the control unit 70 is configured by an adjustment switch 71, a control circuit unit 72, and the like. The adjustment switch 71 is installed on, for example, a steering handle of the vehicle 1 outside the housing 10 and can be operated by an occupant. The adjustment switch 71 has, for example, two types of operation members 71 a and 71 b such as a push type. Specifically, the down operation member 71a is an operation member for moving the display position of the virtual image VRI downward. The up operation member 71 b is an operation member for moving the display position of the virtual image VRI upward.

  The control circuit unit 72 is an electronic circuit in which at least one processor, a memory, an input / output interface and the like are mounted on a substrate. The processor can execute various processes by executing a computer program stored in the memory based on a signal input through the input / output interface. The control circuit unit 72 can communicate with the adjustment switch 71, and is electrically connected to the stepping motor 46 of the drive output unit 45.

  The control circuit unit 72 includes a display position adjustment unit 73 as a functional block constructed mainly of such an electronic circuit.

  The display position adjustment unit 73 adjusts the display position of the virtual image VRI as shown in FIG. 10 in accordance with the signal from the adjustment switch 71. Specifically, the display position adjustment unit 73 calculates the amount of downward movement of the virtual image VRI based on, for example, the push operation time of the down operation member 71a, and realizes the change angle of the reflective surface 32 corresponding to the amount of movement. An electric signal for outputting the output amount of the stepping motor 46, which is calculated backward from the rotation amount of the rotary shaft 35, is output to the stepping motor 46. In order to move the virtual image VRI downward, the direction of the reflecting surface 32 may be changed so as to face upward, ie, the reflecting surface 32 may lie down, so that the rotational direction of the rotation shaft 35 at this time is the axis When viewed from the side of the element 35a to the side of the axial element 35b, the counterclockwise direction is obtained.

  In addition, the display position adjustment unit 73 calculates the amount of upward movement of the virtual image VRI based on, for example, the push operation time of the up operation member 71b, and realizes the change angle of the reflecting surface 32 corresponding to the amount of movement. An electrical signal for outputting the output amount of the stepping motor 46, which is inversely calculated from the rotation amount of the rotating shaft 35, is output to the stepping motor 46. In order to move the virtual image VRI upward, it is sufficient to change the direction of the reflecting surface 32 to be more toward the rear of the vehicle, that is, to cause the reflecting surface 32 to occur. When viewed from the side of the shaft element 35a, when viewed from the side of the shaft element 35b. That is, in the case of moving the virtual image VRI downward and the case of moving the virtual image VRI upward, rotation in the opposite direction is output.

  In conjunction with the rotation of the rotary shaft 35, parallel movement of the rotary shaft 35 according to the displacement of the extension guide strip 38 in the axial direction AD is realized. The extending guide strip 38 of the present embodiment is displaced toward the reflecting surface 32 in the axial direction AD as it proceeds from the one end 38 a in the counterclockwise direction described above. In other words, the extending guide strip 38 is displaced to the side opposite to the reflecting surface 32 in the axial direction AD, as advancing in the above-mentioned clockwise direction from the other end 38 b. The amount of displacement in the axial direction AD of the extending guide bar 38 is set in accordance with the shape of the projection unit 4, for example, the mode of dissection of the projection inclination angle θp. In particular, the amount of displacement in this embodiment is a rotation amount. The displacement about the axis 35 (that is, the phase displacement) is set to change linearly.

  Therefore, assuming that the rotation shaft 35 is fixed in the axial direction AD, the virtual image VRI is laterally shifted to the left along with the downward movement of the virtual image VRI. Since the reflector 31 itself translates substantially to the right along the axial element 35b, that is, along the axial direction AD in conjunction with the direction being changed to be more upward, the lateral deviation is canceled. Therefore, when the occupant operates the down operation member 71a, the virtual image VRI moves substantially straight downward. At the same time, the rotation of the virtual image VRI is also suppressed.

  Similarly, assuming that the rotating shaft 35 is fixed in the axial direction AD, the virtual image VRI is laterally shifted to the right as the virtual image VRI moves upward. In the present embodiment, the reflecting surface 32 is used. Since the reflector 31 itself translates substantially to the left along the axial element 35a, that is, along the axial direction AD in conjunction with the change of the direction of the rear to the rear, the lateral deviation is canceled out. . Therefore, when the occupant operates the up operation member 71b, the virtual image VRI moves substantially straight upward. At the same time, the rotation of the virtual image VRI is also suppressed.

  In the first embodiment, the drive output portion 45, the output shaft side gear 49 and the rotation shaft side gear 40 are the main components, and the reflector 31 is rotated around the rotation shaft 35 provided in the reflector 31. The "rotation part" which changes direction of reflective surface 32 is constituted. Further, in the first embodiment, the “moving portion” is configured to move the reflector 31 itself in conjunction with the change in the direction of the reflecting surface 32 with the extension guide strip 38 and the engaging portion 53 as the main components. ing.

(Action effect)
The effects and advantages of the first embodiment described above will be described again below.

  According to the first embodiment, in conjunction with the change in the direction of the reflective surface 32, the reflector 31 itself that holds the reflective surface 32 moves. In this way, when the direction of the reflecting surface 32 that reflects the display light from the projector 20 to the projection unit 4 side is changed, the deviation of the virtual image VI (so-called lateral deviation) in a direction different from the intended direction is It can correct | amend by movement of reflector 31 itself. Thus, the virtual image VRI can be moved linearly in the intended direction by correcting the lateral displacement more accurately. Therefore, the sense of discomfort to the occupant when adjusting the position of the virtual image VRI can be reduced, and the comfort in visual recognition of the virtual image VRI can be enhanced.

  Further, according to the first embodiment, the moving unit moves the rotation shaft 35 in the axial direction AD to move the reflector 31 itself in parallel along the axial direction AD. In this way, the lateral displacement can be corrected by the movement of the reflector 31 itself while suppressing mutual interference to the display state of the virtual image VRI due to the change of the direction of the reflecting surface 32 around the axial direction AD by the pivoting portion. . Therefore, it becomes possible to adjust the amount of parallel movement of the reflector 31 to correct the lateral shift accurately, and the comfort in visual recognition of the virtual image VRI becomes more remarkable.

  Further, according to the first embodiment, the engaging portion 53 guided by the extending guide bar 38 by engaging with the extending guide bar 38 follows the extending direction of the extending guide bar 38 as the rotation shaft 35 rotates. Slide the extension guide bar 38 in the same manner. By adopting such a structure, when rotating the rotation shaft 35, the rotation shaft 35 automatically moves relative to the support 51 according to the displacement of the extension guide strip 38 in the axial direction AD. Therefore, it is possible to easily realize a moving unit that moves the reflector 31 itself in conjunction with the change in the direction of the reflecting surface 32.

  Further, according to the first embodiment, the engaging portion 53 is formed in the shape of a protrusion in a state of being inserted into the inside of the groove-shaped extending guide strip 38. In this way, even when the rotation shaft 35 rotates, the reflector 31 can be moved while suppressing the application of an excessive stress on the extension guide bar 38 or the engagement portion 53. Accordingly, the durability of the HUD device 100 is enhanced, and high comfort in visual recognition of the virtual image VRI can be maintained for a long time.

  Further, according to the first embodiment, the tooth width Wt along the axial direction AD of the rotation shaft side gear 40 is larger than the total displacement Dsp of the axial direction AD between the two end portions 38a and 38b of the extending guide bar 38 . In this way, even if the meshing position with the output shaft side gear 49 of the rotating shaft side gear 40 moves in the axial direction AD along with the axial direction AD movement of the reflector 31, the rotating shaft side gear 40 and the output shaft side gear The meshing state with 49 can be maintained.

  Then, in the present configuration in which the rotation of the drive output unit 45 is transmitted to the rotation shaft side gear 40 using the output shaft side gear 49 provided on the output shaft 48 extending in the direction intersecting the axial direction AD, the drive output unit In the state where 45 is fixed to the support 51 side, it is possible to move the rotation shaft 35 along the axial direction AD. Therefore, since stable rotation can be output from the drive output unit 45 in the fixed state, movement of the virtual image VRI in the intended direction is stably realized. Therefore, the comfort in visual recognition of virtual image VRI can be improved.

  Further, according to the first embodiment, the output shaft side gear 49 is a helical gear. Therefore, even if the direction of the output shaft side gear 49 and the direction of the rotation shaft side gear 40 are different, it is easy to transmit the rotation from the output shaft side gear 49 to the rotation shaft 35 through the rotation shaft side gear 40. It becomes.

Second Embodiment
As shown in FIGS. 11 and 12, the second embodiment is a modification of the first embodiment. The second embodiment will be described focusing on differences from the first embodiment.

  As shown in FIG. 10, the reflection unit 230 of the second embodiment guides the display light to the projection unit 4 by reflecting the display light from the projector 20 as in the first embodiment. It is a unit. The reflection unit 230 includes a reflector 231, a first drive output unit 245a, a pair of supports 251 and 255, a stage 260, a feed screw 261, and a second drive output unit 245b.

  The reflector 231 is a rotation shaft provided so as to penetrate the approximate center of the reflector 231 in the longitudinal direction, and is positioned by a pair of axial elements 235 a and 235 b protruding at both ends of the reflector 231. It has an axis 235. The guide parts 37 and the rotary shaft side gear 40 and the like are not provided in the shaft elements 235a and 235b of the second embodiment, and the cylindrical parts 236 and 239 in a cylindrical shape simply project.

  The cylindrical portion 236 of one shaft element 235a is made common with the output shaft 248a of the first drive output portion 245a. That is, the output shaft 248a is connected to the rotating shaft 235 by extending in the axial direction AD, and in particular, in the present embodiment, the output shaft 248a is practically integrated with the rotating shaft 235. The structure inside the casing of the first drive output portion 245a is the same as the drive output portion 45 of the first embodiment.

  Thus, the first drive output unit 245a outputs rotation to the rotation shaft 235 through the output shaft 248a, and rotationally drives the reflector 231. The rotational drive around the rotation shaft 235 changes the orientation of the reflective surface 32 held by the reflector 231.

  Similarly to the first embodiment, the pair of supports 251 and 255 are provided individually corresponding to the respective axial elements 235 a and 235 b in the rotation shaft 235. The supports 251 and 255 are fastened to the stage 260 by, for example, screws. Each support body 251,255 has the U-shaped support groove 252,256 opened to the upper side similarly to the support body 55 of 1st Embodiment. By placing the cylindrical portions 236 and 239 in contact with the groove bottoms 252a and 256a formed in a semicircular shape in the support grooves 252 and 256, the rotation shaft 235 by the shaft elements 235a and 235b is It is supported so as to be integrally rotatable with the reflector 231. In the second embodiment, since the extension guide strips 38 are not provided, even when the rotation shaft 235 is rotated, it does not move in the axial direction AD with respect to the supports 251 and 255 by itself.

  The stage 260 is formed of, for example, a synthetic resin in a rectangular flat plate shape, and holds the reflector 231 via the pair of supports 251 and 255. The stage 260 is provided with a through hole 260 a penetrating the stage 260 in the axial direction AD. A nut 260 b fitted to the feed screw 261 is disposed inside the through hole 260 a in a state of being fixed to the stage 260.

  The feed screw 261 is rotatably supported by a stage base 262 fixed to the housing 10 and extends along the axial direction AD. The feed screw 261 is engaged with the nut 260 b in a state of penetrating the through hole 260 a. The feed screw 261 is coupled or integrated with the output shaft 248 b of the second drive output portion 245 b. The structure inside the casing of the second drive output portion 245b is similar to that of the first drive output portion 245a.

  Thus, the second drive output unit 245b outputs the rotation to the feed screw 261 through the output shaft 248b, and rotates the feed screw 261. When the feed screw 261 pivots, the stage 260 translates along the axial direction AD, whereby the reflector 231 coupled to the stage 260 itself translates along the axial direction AD. Thus, the reflector 231 can be moved relative to the housing 10.

  As shown in FIG. 12, in the control unit 270 according to the second embodiment, the display position adjustment unit 273 sets the vertical movement setting unit 274, the deviation correction setting unit 275, and the drive control unit 276 as further subdivided functional blocks. have.

  The vertical movement setting unit 274 sets an output amount to be output to the stepping motor 246a of the first drive output unit 245a corresponding to the movement direction and the movement amount of the virtual image VRI in the vertical direction. The vertical movement setting unit 274 calculates the upward or downward movement amount of the virtual image VRI based on, for example, the push operation time of the operation members 71a and 71b, and realizes the change angle of the reflecting surface 32 corresponding to the movement amount. The amount of output of the stepping motor 246a which is calculated backward from the amount of rotation of the rotary shaft 235 is set.

  The shift correction setting unit 275 sets an output amount to be output to the stepping motor 246 b of the second drive output unit 245 b in accordance with the vertical movement setting by the vertical movement setting unit 274. The shift correction setting unit 275 sets the horizontal shift direction of the virtual image VRI when the reflector 231 itself is not moved based on the current direction of the reflecting surface 32 and the movement direction and movement amount set by the vertical movement setting unit 274. And, the amount of lateral displacement is predicted, and the amount of output of the stepping motor 246b calculated backward from the amount of parallel displacement for realizing parallel displacement of the reflector 231 for the purpose of offsetting the predicted lateral displacement is set.

  The drive control unit 276 simultaneously controls the first drive output unit 245 a and the second drive output unit 245 b so as to drive them in conjunction with each other. That is, the drive control unit 276 outputs an electrical signal based on the output amount set by the vertical movement setting unit 274 to the stepping motor 246 a of the first drive output unit 245 a. At the same time, the drive control unit 276 outputs, to the stepping motor 246b of the second drive output unit 245b, an electrical signal based on the output amount set by the deviation correction setting unit 275. Thus, the reflector 231 is moved in conjunction with the change in the direction of the reflecting surface 32.

  In the second embodiment, the first drive output unit 245a or the like is the main component, and the direction of the reflecting surface 32 is changed by rotating the reflector 231 around the rotation axis 235 provided in the reflector 231. A "rotational part" is comprised. In the second embodiment, the second drive output unit 245b, the feed screw 261, the stage 260, and the like are the main components, and the reflector 231 is moved in conjunction with the change in the direction of the reflecting surface 32. Section is configured.

  According to the second embodiment described above, the drive control unit 276 includes the first drive output unit 245 a that rotates the reflector 231 around the rotation axis 235 and the second drive output unit 245 b that moves the reflector 231 itself. Drive in conjunction with each other. By doing this, it is possible not only to easily move the reflector 231 itself in conjunction with the change of the direction of the reflecting surface 32, but also to move the reflector 231 itself according to the shape of the projection unit 4. Fine adjustment of the amount is also facilitated as it is realized in a controlled manner. As a result, it is possible to correct lateral deviation more accurately.

(Other embodiments)
As mentioned above, although a plurality of embodiments were described, the present disclosure should not be construed as being limited to these embodiments, and applied to various embodiments and combinations within the scope of the gist of the present disclosure. Can.

  Specifically, as the first modification, the display position adjustment units 73 and 273 may be realized by a simpler electric circuit or the like instead of the program processing by the processor.

  In the second modification, instead of the display position adjustment units 73 and 273 based on the operation of the adjustment switch 71, the camera or the like installed in the vehicle 1 detects the position of the eye of the occupant, and the position of the eye A configuration may be adopted in which the display position of the virtual image VRI is automatically adjusted based on the above.

  As a third modification, on the optical path OP from the projector 20 to the projection unit 4, a reflecting mirror or a lens other than the reflecting surface 32 of the reflecting unit 30 may be disposed.

  As a fourth modification, the reflective surface 32 may be formed to be flat or convex.

  As a fifth modification related to the first embodiment, the axial direction of the extending guide bar 38 corresponds to the projection unit 4 that changes the projection inclination angle θp so as to increase nonlinearly with respect to the displacement from the lower side to the upper side. The displacement amount of AD may be set to change nonlinearly with respect to displacement (phase displacement) around the rotation axis 35.

  As a sixth modification related to the first embodiment, in the guide portion 37, only one extension guide strip 38 may be provided, or three or more may be provided.

  As a seventh modification related to the first embodiment, the extending guide bar 38 may be a protruding bar, and the engaging portion 53 and the extending guide bar 38 can be slidably engaged with the extending guide bar 38. It may be engaged.

  As an eighth modification related to the first embodiment, the extension guide stripe 38 may be provided on the support 51 side, and the engagement portion 53 may be provided on the rotation shaft 35 side.

  As a ninth modification related to the first embodiment, the output shaft 48 of the drive output unit 45 may be directly connected to the rotation shaft 35 without providing the output shaft side gear 49 and the rotation shaft side gear 40.

  As modification 10 about a 1st embodiment, projection part 4 may be provided in combiners other than a windshield of vehicles 1, etc.

  As a modification 11, the moving part is not limited to the configuration in which the reflector 31 is moved in parallel along the axial direction AD, but is configured to move the reflector 31 in parallel in the direction intersecting with the axial direction AD The structure etc. which move the reflector 31 along the rail to extend can be employ | adopted.

  As a modification 12, the axial direction AD of the rotation axis 35 may not be disposed along the horizontal plane HP, and the rotation axis 35 may be a so-called tilt axis.

  As a modified example 13, the virtual image display device can be applied to various vehicles such as an aircraft, a ship, or a non-moving casing.

  100 HUD device (virtual image display device), 4 projection units, 20 projectors, 31, 231 reflectors, 32 reflection surfaces, 35, 235 rotation axes, 38 extension guide stripes, 40 rotation axis side gears, 45 drive output units, 49 Output shaft side gear, 53 engagement portion, 245a first drive output portion, 245b second drive output portion, 260 stage, 261 feed screw, OP light path

Claims (7)

A virtual image display apparatus for displaying a virtual image so that the image can be viewed visually by projecting the image onto a projection unit (4),
A projector (20) for projecting display light of the image;
A reflector (31, 231) for holding a reflective surface (32) for reflecting the display light from the projector side toward the projection unit on an optical path (OP) from the projector to the projection unit; ,
A pivoting unit that changes the direction of the reflecting surface by pivoting the reflector around a rotation axis (35, 235) provided on the reflector;
A moving unit configured to move the reflector itself in conjunction with the change in the direction of the reflecting surface.   2. The virtual image display device according to claim 1, wherein the moving unit moves the rotating shaft in an axial direction (AD) to parallelly move the reflector itself along the axial direction. It further comprises a support (51, 55) for supporting the reflector via the rotation axis,
The moving unit is
An extending guide strip (38) provided on one side of the rotating shaft and the support and extending around the rotating shaft with the axial displacement;
It is an engaging portion provided on the other side of the rotating shaft and the support, and being guided by the extending guide strip by engaging with the extending guide strip, the extending portion being extended according to the rotation of the rotating shaft. The virtual image display apparatus according to claim 2, further comprising: an engaging portion (53) which slides the extension guide strip along the extension direction of the guide strip. The stretching guide strip is formed in a groove shape,
The virtual image display apparatus according to claim 3, wherein the engagement portion is formed in a projecting shape in a state of being inserted into the inside of the extension guide strip. The rotation unit is
A drive output portion (45) having an output shaft (48) extending in a direction intersecting with the axial direction, the output shaft being formed so as to be rotatable;
An output shaft side gear (49) provided on the output shaft;
A rotary shaft gear (40) provided on the rotary shaft side, meshing with the output shaft side gear, and transmitting the rotation from the output shaft side gear to the rotary shaft;
The tooth width (Wt) along the said axial direction of the said rotating shaft side gear is larger than the displacement amount of the said axial direction between the both ends (38a, 38b) of the said extending | stretching guide strip according to Claim 3 or 4 Virtual image display device.   The virtual image display apparatus according to claim 5, wherein the output shaft side gear is a helical gear. The rotation unit includes a first drive output unit (245a) for rotating the reflector around the rotation shaft through an output shaft (248a) connected to the rotation shaft,
The moving unit includes a second drive output unit (245b) that moves the reflector itself by parallelly moving a stage (260) connected to the reflector.
The virtual image display device according to claim 1 or 2, further comprising a drive control unit (276) configured to control the first drive output unit and the second drive output unit to drive in conjunction with each other.

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