JP2020056944A - Virtual image display device - Google Patents

Abstract

To provide a virtual image display device that is appropriate to installation to a vehicle.SOLUTION: A HUD device serving as a virtual image display device comprises: a concave mirror 40 rotating around a rotational axis A1 and thereby capable of changing its direction; a connection arm 60 connected to an out-of-axis portion 40b of the concave mirror 40 away from the rotation axis A1; and an actuator that pulls the out-of-axis portion 40b in a different pulling direction from the axis direction AD1 of the rotation axis A1 via the connection arm 60 so as to change the direction of the concave mirror 40. The out-of-axis portion 40b bends and extends around an auxiliary axis A2 in a different direction from the rotational direction of the concave mirror 40 and has an extension groove body 50 in which an extension groove 53 having a bottom 54 facing outward of the auxiliary axis A2 in the radial direction is formed. The connection arm 60 has a pair of contact bodies 64a and 64b that are in contact with areas whose angles around the auxiliary axis A2 are different from each other at the bottom 54 so as to sandwich the extension groove 50 when the connection arm 60 is fitted to the extension groove 53.SELECTED DRAWING: Figure 3

Description

  The disclosure according to this specification relates to a virtual image display device.

  BACKGROUND ART Conventionally, a virtual image display device configured to be mounted on a vehicle and displaying a virtual image by projecting display light onto a projection unit is known. The vehicle display device disclosed in Patent Literature 1 includes a deflecting mirror as an optical component and a motor unit as an actuator. The optical component is formed so as to be able to change the direction by guiding the display light to the projection unit and rotating around a rotation axis passing through the inside of the projection unit. The actuator pulls the optical component via the connecting rod. The first end of the connecting rod is connected to the mirror holder. The connecting rod extends in a direction perpendicular to the rotation axis.

JP-T-2018-501510

  In the case where the connecting rod connected to the mirror holder is extended in the rotation direction of the optical component perpendicular to the axial direction as in Patent Literature 1, the actuator is disposed in the extending direction of the connecting rod with respect to the optical component. There is a need to. For this reason, there is a concern that the degree of freedom in arranging the actuator is low, the actuator mechanically or optically interferes with other components of the virtual image display device, a wasteful space is generated because a rational arrangement cannot be performed, and the like. I have. In addition, there is a need for a device that further enhances the mountability of the vehicle.

  One object disclosed is to provide a virtual image display device suitable for mounting on a vehicle.

An aspect disclosed herein is a virtual image display device configured to be mounted on a vehicle (1) and displaying a virtual image by projecting display light onto a projection unit (3a),
An optical component (40) for guiding display light to the projection unit, wherein the optical component (40) is formed so as to be able to change its direction by rotating around a rotation axis (A1) penetrating the inside;
A connecting arm (60) connected to an off-axis position (40b) of the optical component that is arranged off-axis away from the rotation axis;
An actuator (80) that pulls an external position of the shaft in a pulling direction that is different from the axial direction (AD1) of the rotation shaft via the connecting arm so as to change a direction of the optical component;
One of the outer axis position of the optical component and the connecting arm extends while bending around the auxiliary shaft (A2) along a direction different from the rotation direction (RD) of the optical component, and extends radially outside the auxiliary shaft. An elongated groove body (50) having an elongated groove (53) having a bottom surface (54) facing the elongated groove body (50);
The other of the outer axis position of the optical component and the connecting arm is in a state of being fitted in the extension groove, and a pair of contact bodies (in contact with positions at different angles around the auxiliary axis on the bottom surface portion so as to sandwich the extension groove body. 64a, 64b).

  According to such an aspect, the pair of contact members provided on one of the outer position of the optical component and the connecting arm is positioned at different angles around the auxiliary axis on the bottom surface of the extending groove provided on the other. Is in contact with In such a coupling form between the connecting arm and the outer axial position of the optical component, when the actuator pulls the outer axial position via the connecting arm, the optical component is pulled in the pulling direction with the extending groove body being sandwiched by the pair of contact members. , And its direction is changed. At this time, the pair of contact members slides around the auxiliary shaft on the bottom surface portion that extends while curving around the auxiliary shaft, so that the relative positions of the extending groove body and the pair of contact members in the circumferential direction are shifted. On the other hand, since the pair of contact bodies are fitted in the extended grooves forming the bottom surface, the contact state is easily maintained even if the relative position is shifted in the circumferential direction, and the contacting direction is such that the connecting arm is twisted. The rotation of the connecting arm is restricted. As described above, since the orientation of the optical component is smoothly changed, the display mode of the virtual image can be appropriately adjusted, so that the virtual image display device can exhibit the performance required for mounting on a vehicle.

  By the way, in the aspect in which the extended groove body is sandwiched between the pair of contact bodies, even if the connecting arm is obliquely coupled to the axis outside from a direction slightly inclined with respect to the rotation direction of the optical member, the bottom part of the pair of contact bodies It is possible to maintain the state of contact with. Even in the diagonally connected state, the auxiliary shaft is arranged to intersect with the rotation direction of the optical component, so that the pair of contact members slide around the auxiliary shaft on the bottom surface while rotating the external position of the optical component. It is possible to pull in the direction. Therefore, since the connecting arm can be coupled to the position outside the axis from the direction according to the arrangement of the actuator, the degree of freedom of arrangement of the actuator is high. Therefore, it is possible to arrange the actuator so as to avoid interference with other parts and to avoid wasting space, or to enhance the optical performance without being restricted by the arrangement of the actuator. Become. As described above, a virtual image display device suitable for mounting on a vehicle can be provided.

  It should be noted that the reference numerals in parentheses are for exemplarily showing the correspondence with the parts of the embodiment described later, and are not intended to limit the technical scope.

It is a figure showing the loading state of the HUD device of a 1st embodiment to a vehicle. It is a figure showing the example of arrangement of each member of a 1st embodiment. It is a perspective view showing a concave mirror, a connection arm, and an arm support of a 1st embodiment. FIG. 3 is a perspective view of the elongated groove body of the first embodiment. It is the perspective view which looked at the extension groove | channel body from the opposite side of FIG. It is a top view of the extension groove object of a 1st embodiment. It is a perspective view of a connection arm of a 1st embodiment. It is a top view of the connection arm of 1st Embodiment. It is a side view of the connection arm of a 1st embodiment. It is a perspective view which expands and shows the branch part (X part of FIG. 9) in the connection arm of 1st Embodiment. It is a perspective view which expands and shows the XI part of FIG. 10 further. It is a figure showing a hollow part in an arm support of a 1st embodiment. It is a figure which shows typically the state in which a pair of contact bodies sandwich an extended groove body in 1st Embodiment. FIG. 14 is a diagram corresponding to FIG. 13 in one example of Modification Example 1. FIG. 15 is a diagram corresponding to FIG. 14 in another example of the first modification. It is a side view which shows the branch part of the modification 4.

  An embodiment will be described with reference to the drawings.

(1st Embodiment)
As shown in FIG. 1, the virtual image display device according to the first embodiment of the present disclosure is configured to be mounted on an automobile as a vehicle 1, and a head-up device housed in an instrument panel 2 of the vehicle 1. It is a display device (hereinafter, HUD device) 100. Here, the vehicle is broadly understood to include various vehicles such as an aircraft, a ship, and a non-moving game housing, in addition to an automobile and a railway vehicle.

  The HUD device 100 projects display light of an image toward a projection unit 3a set on the windshield 3 of the vehicle 1. As a result, the HUD device 100 displays a virtual image VRI that can be visually recognized by an occupant of the vehicle 1. That is, the display light reflected by the projection unit 3a reaches the visual recognition area EB set in the room of the vehicle 1. As a result, the occupant sitting on the seat 4 arranged to face the instrument panel 2 and having the eye point EP in the viewing area EB perceives the display light as a virtual image VRI. Then, the occupant can recognize various information displayed as the virtual image VRI. Examples of the various types of information displayed as virtual images include information indicating a state of the vehicle 1 such as a vehicle speed and a remaining fuel amount, or navigation information such as view assist information and road information.

  In the following, unless otherwise specified, the directions indicated by front, rear, up, down, left, and right are described with reference to the vehicle 1 on the horizontal plane HP.

  The windshield 3 of the vehicle 1 is formed in a light-transmissive plate shape from, for example, glass or synthetic resin, and is disposed above the instrument panel 2. The windshield 3 is arranged so as to be inclined away from the instrument panel 2 as going from the front to the rear. The windshield 3 forms a projection portion 3a on which image display light is projected into a smooth concave or planar shape. In addition, the projection part 3a may not be provided in the windshield 3. For example, a combiner that is separate from the vehicle 1 may be installed in the vehicle, and the combiner may be provided with the projection unit 3a.

  The visual recognition area EB is a space area where the virtual image VRI displayed by the HUD device 100 can be visually recognized so as to satisfy a predetermined standard (for example, so that the entire virtual image VRI has a predetermined brightness or more). Called. The visual recognition area EB is typically set so as to overlap with the eye lip set for the vehicle 1. The eye lip is set in a virtual ellipsoidal shape based on an eye range that statistically represents the spatial distribution of the occupant's eye points EP.

  The specific configuration of the HUD device 100 will be described below with reference to FIGS. As shown in FIG. 2, the HUD device 100 includes a housing 10, a display 20, a plane mirror 30, a concave mirror 40, a connecting arm 60, an arm support 70, an actuator 80, a control unit 90, and the like.

  The housing 10 has a hollow box shape that accommodates 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 above the projection 3a. The window 11 may be physically open, or may be covered with a dustproof sheet capable of transmitting display light.

  The display 20 is, for example, a transmissive liquid crystal display. The display 20 is formed by housing a liquid crystal panel and a backlight in a casing. The display 20 projects display light that contributes to the image display 20 by transmitting and illuminating the screen 21 of the liquid crystal panel with a backlight. The display 20 is a reflective liquid crystal display, an EL display that emits light by itself using electroluminescence, a laser scanner display, or a DLP (Digital Light Processing) using a DMD (Digital Micromirror Device). (Registered trademark) type display or the like can also be adopted. The screen 21 of the display 20 faces, for example, approximately upward, and display light is emitted upward.

  The plane mirror 30 and the concave mirror 40 are optical components that guide display light emitted from the display 20 to the projection unit 3a. The plane mirror 30 is formed in a rectangular plate shape from, for example, synthetic resin or glass. The plane mirror 30 has a reflection surface 31 formed by evaporating a metal film such as aluminum on the surface. The reflection surface 31 is formed in a smooth planar shape. The plane mirror 30 is located approximately above the display 20, and the reflection surface 31 faces forward and downward in an oblique direction. Display light that has entered the plane mirror 30 from the display 20 is reflected by the reflection surface 31 toward the concave mirror 40.

  The concave mirror 40 is formed in a rectangular plate shape from, for example, synthetic resin or glass. The concave mirror 40 has a reflective surface 41 formed by evaporating a metal film such as aluminum on the surface. The reflecting surface 41 is formed in a smooth concave shape by curving in a concave shape so that the central portion is depressed. The concave mirror 40 is located substantially forward with respect to the display 20 and the plane mirror 30, and the reflection surface 41 is directed rearward and upward in an oblique direction.

  The display light that has entered the concave mirror 40 from the plane mirror 30 is reflected by the reflection surface 41 toward the upper projection unit 3a. Here, the virtual image VRI can be enlarged by the reflection on the reflection surface 41. Furthermore, the distortion of the enlarged virtual image VRI can be reduced by forming the reflection surface 41 into a free-form surface.

  The display light reflected on the reflecting surface 41 of the concave mirror 40 in this way is emitted to the outside of the HUD device 100 by passing through the dustproof sheet, and enters the projection unit 3a of the windshield 3. When the display light reflected by the projection unit 3a reaches the occupant's eye point EP, the occupant can visually recognize the virtual image VRI.

  Further, the concave mirror 40 is provided with a rotation axis A1 extending in the left-right direction along the horizontal plane HP so as to penetrate the concave mirror 40. Both ends 42 of the rotation axis A1 are formed in a cylindrical shape protruding from the side 40a of the concave mirror 40. Both end portions 42 are supported by a concave mirror support fixed to the housing 10, and the concave mirror 40 is formed so as to be able to change the direction of the reflection surface 31 by rotating around the rotation axis A <b> 1. .

  When the reflecting surface 41 of the concave mirror 40 faces upward (that is, when the concave mirror 40 lies down), the projection position on the projection unit 3a shifts further forward, and the display position of the virtual image VRI shifts upward. At the same time, the position of the viewing area EB shifts downward. On the other hand, when the reflecting surface 41 of the concave mirror 40 faces downward (that is, when the concave mirror 40 stands up), the projection position on the projection unit 3a shifts further backward, and the display position of the virtual image VRI shifts further downward. At the same time, the position of the viewing area EB shifts upward. Therefore, the display mode of the virtual image VRI is changed according to the change in the direction of the concave mirror 40.

  Such a direction of the concave mirror 40 is defined by the pressing of the concave mirror 40 by the elastic force of the elastic member provided on the concave mirror 40 when the actuator 80 does not exert any external force on the concave mirror 40. As the elastic member, for example, a tension spring that pulls the concave mirror 40 from the housing 10 or the concave mirror support, a torsion coil spring wound around the rotation axis A1, and the like can be used. The elastic member exerts an elastic force in the direction in which the concave mirror 40 stands up in the rotation direction RD of the concave mirror 40. Such a change in the direction of the concave mirror 40 is realized by the actuator 80 pulling the shaft outer position 40 b via the connecting arm 60. The off-axis position 40b means an off-axis portion of the concave mirror 40 separated from the rotation axis A1.

  For this purpose, as shown in FIG. 3, the concave mirror 40 has an extended groove body 50 at a position which is rearward and downward with respect to the rotation axis A1 in the outer axis position 40b. In the present embodiment, the extending groove body 50 is formed integrally with the concave mirror 40. However, the extending groove body 50 may be fixed to the concave mirror 40, and the extending groove body 50 of another component is fitted. It may be coupled to the concave mirror 40 by being performed.

  The extended groove body 50 shown in FIGS. 3 to 6 is formed of, for example, a synthetic resin in a cylindrical shape protruding from the side portion 40 a of the concave mirror 40 along the axial direction AD1 of the rotation axis A1. An auxiliary axis A2 along the axial direction AD1 is set substantially coincident with the central axis of the cylindrical elongated groove body 50. In the present embodiment, the auxiliary axis A2 is set substantially parallel to the rotation axis A1. In the extending groove body 50, an extending groove 53 and a chord-like portion 55 are provided in a groove region 52 inserted into two cylindrical surfaces 51 having the auxiliary axis A2 as a central axis.

  The extending groove 53 is provided so as to be recessed radially inward of the auxiliary shaft A2 with respect to the cylindrical surface 51 on both sides. The bottom surface portion 54 of the extension groove 53 is formed in a curved surface shape that extends smoothly around the auxiliary axis A2, more specifically, while being curved in the circumferential direction of the auxiliary axis A2, and that faces outward in the radial direction of the auxiliary axis A2. I have. In particular, the bottom surface portion 54 of the present embodiment inserts the central portion 53a of the extension groove 53, and forms an inclined bottom surface 54a located on the side portion 40a side and an inclined bottom surface 54b located on the opposite side to the side portion 40a. It has so that it may line up with the width direction of the extension groove | channel 53 substantially coinciding with direction AD2.

  Each of the pair of inclined bottom surfaces 54a and 54b is inclined so as to expand with a substantially constant inclination from the central portion 53a of the extending groove 53 toward the side edge 53b of the extending groove 53. In other words, each of the pair of inclined bottom surfaces 54a has a partial conical surface that is inclined so as to decrease in diameter from the side edge 53b toward the center 53a.

  At the side edge 53b, a convex curved surface is formed, so that the inclined bottom surfaces 54a and 54b and the cylindrical surface 51 are smoothly connected. Also at the central portion 53a, a concave curved surface is formed, so that the two inclined bottom surfaces 54a and 54b are smoothly connected. Thus, the bottom surface portion 54 of the elongated groove 53 of the present embodiment has a V-shaped cross section in the width direction.

  In the present embodiment, the extension groove 53 extends around the auxiliary axis A2 in an annular shape (also called an arc shape) by 180 degrees. The extending groove 53 formed in such a semicircular region is arranged so as to face the side opposite to the direction of the reflecting surface 41 in the concave mirror 40.

  The chordal portion 55 is formed in a chordal shape connecting both ends of the extension groove 53 so as to cut out the extension groove 53. The chordal portion 55 has a planar shape extending along the radial direction of the auxiliary axis A2 so as to intersect with the auxiliary axis A2. The surface of such a chordal portion 55 is disposed so as to face the same side as the reflection surface 41 in the concave mirror 40.

  The connection arm 60 shown in FIGS. 3, 7 to 11 is formed of, for example, a synthetic resin, and is connected to the actuator 80 and the shaft outer position 40b. In other words, the connecting arm 60 connects the actuator 80 and the shaft outer position 40b. Specifically, the connection arm 60 integrally has a rod-shaped portion 61, an insertion portion 62, a branch portion 63, and a pair of contact bodies 64a and 64b.

  The rod portion 61 is formed in a rod shape extending from the actuator 80 side to the concave mirror 40 side. The rod-shaped portion 61 of the present embodiment includes two linear portions 61a extending linearly and parallel to each other, and a bent portion 61b formed between the linear portions 61a and bent in an S-shape. doing. Due to the formation of the bent portion 61b, the end on the actuator 80 side and the end on the concave mirror 40 side of the rod-shaped portion 61 are arranged so as to be largely displaced in the axial direction AD2 of the auxiliary shaft A2. In the present embodiment, the axial direction AD1 and the axial direction AD2 match each other.

  Further, the bar-shaped portion 61 has a rib 61c projecting in a cross shape over the entire straight portion 61a and the bent portion 61b. The strength of the connecting arm 60 is enhanced by such a rib 61c.

  The insertion portion 62 is inserted into the guide recess 72 of the arm support 70 so as to be supported by the arm support 70. The insertion portion 62 has an enlarged diameter portion 62a and a connection portion 62c that connects the enlarged diameter portion 62a to the rod-shaped portion 61. The connecting portion 62c is formed in a cylindrical shape having a smaller diameter than the rod-shaped portion 61 and the enlarged diameter portion 62a. The enlarged diameter portion 62a is formed in a column shape having a spherical stopper surface 62b facing the connection portion 62c side by increasing the diameter from the connection portion 62c toward the actuator 80 side. The larger diameter side of the enlarged diameter portion 62 a is connected to the motion conversion mechanism 82 of the actuator 80.

  Here, the arm support 70 illustrated in FIGS. 3 and 12 is formed of, for example, a synthetic resin, and supports the connecting arm 60 by inserting the insertion portion 62. The arm support 70 has a wall 71, a guide recess 72, and a recess 73. The wall portion 71 is formed to stand upright to the extending direction of the insertion portion 62. The guide recess 72 is formed so as to be U-shaped recessed from the open end above the wall 71 to the bottom below. The width of the guide concave portion 72 is formed slightly larger than the diameter of the connecting portion 62c. The recess 73 is formed so as to face the stopper surface 62b, and is formed in a spherical shape so as to surround the bottom of the guide recess 72 from the surface of the wall 71 on the side of the enlarged diameter portion 62a. Thus, when the actuator 80 does not exert any external force on the concave mirror 40, the stopper surface 62b comes into contact with the concave portion 73 in a fitted state. When the actuator 80 displaces the connecting arm 60 in the pulling direction, the stopper surface 62b separates from the recess 73.

  On the concave mirror 40 side of the connecting arm 60, a branch portion 63 is formed as shown in an enlarged manner in FIG. The branch portion 63 is formed by bifurcating from the end of the rod portion 61 on the concave mirror 40 side. More specifically, the branch portion 63 includes an upper portion 63a extending so as to wrap around the upper side of the extension groove body 50 along the circumferential direction of the auxiliary shaft A2, and a lower side of the extension groove body 50 extending along the circumferential direction of the auxiliary shaft A2. And a lower portion 63b extending so as to go around. The elongated groove body 50 is arranged to be vertically inserted by a gap between the upper portion 63a and the lower portion 63b. In particular, the upper portion 63a and the lower portion 63b of the present embodiment extend to a position on the opposite side of the rod-shaped portion 61 by inserting the auxiliary shaft A2 and facing the bottom surface portion 54 of the extension groove 53 and the radial direction of the auxiliary shaft A2. A tip is formed at the position.

  One contact body 64a, 64b is provided in one upper part 63a, and one contact body is provided in the other lower part 63b, thereby forming a pair. The contact body 64a is formed to protrude radially inward of the auxiliary shaft A2 from the distal end of the upper portion 63a, and the contact body 64b is formed to protrude radially inward of the auxiliary shaft A2 from the distal end of the lower portion 63b. Have been.

  Each contact body 64a, 64b is formed in a spherical shape having a smooth spherical surface, as shown in particular in FIG. Thereby, as shown in FIGS. 4 and 13, the contact body 64 a has one point on each of the inclined bottom surfaces 54 a and 54 b arranged in the width direction of the extension groove 53 at the position where the bottom surface 54 faces upward. Contact. The contact body 64b is in point contact with each of the inclined bottom surface 54a and the inclined bottom surface 54b at a position where the bottom surface portion 54 faces downward. The double circle marking in FIG. 4 indicates the contact point (the single circle marking in FIGS. 10 and 11 also indicates the contact point). Thus, the pair of contact bodies 64a are in a state of being fitted in the extension grooves 53. The pair of contact bodies 64a and 64b are in contact with each other at positions where angles around the auxiliary axis A2 are different from each other on the bottom surface portion 54 so as to sandwich the elongated groove body 50. The contact angle θ formed by the pair of contact bodies 64a and 64b with respect to the auxiliary axis A2 is set so that the angle formed by the pair of contact bodies 64a and 64b is smaller than 180 degrees on the opposite side of the rod-shaped portion 61 with respect to the auxiliary axis A2.

  The actuator 80 has an electric motor 81 and a motion conversion mechanism 82 as shown in FIG. The electric motor 81 is, for example, a stepping motor, and rotates the motor shaft by a predetermined rotation amount according to an electric signal input from the control unit 90. The motion conversion mechanism 82 converts the rotational motion of the motor shaft into a reciprocating linear motion. In this way, the motion conversion mechanism 82 can pull the connecting arm 60 connected thereto by a moving amount corresponding to the rotation amount.

  In this way, the actuator 80 pulls the connecting arm 60 toward the opposite side of the rotation direction RD of the concave mirror 40 to the direction in which the elastic force of the elastic member is exerted (so that the concave mirror 40 lies). In conjunction with this, in a state where the pair of contact bodies 64a and 64b sandwich the extending groove body 50, the extending groove body 50 is pulled in a pulling direction that is a direction different from the axial direction AD1. Therefore, a rotational moment about the rotation axis A1 acts on the concave mirror 40, and the concave mirror 40 rotates. At this time, the pair of contact members 64a and 64b slide on the bottom surface portion 54 in the extending direction thereof, so that the contact state between the pair of contact members 64a and 64b and the bottom portion 54 is maintained.

  Further, as shown in FIG. 13, one contact body 64a, 64b is in contact with the bottom part 54 at two points each, so that the total number of contact points is four. When the actuator 80 pulls the concave mirror 40, the bottom portion 54 exerts a vertical force having a component toward the central portion 53 a side of the extending groove 53 through these four points. Is less likely to shift in the axial direction AD2. Therefore, stable rotation of the concave mirror 40 is realized.

  The connection arm 60 is connected to the extending groove body 50 via a pair of contact bodies 64a and 64b. The connection unit 49 is constituted by the extension groove 50, the connection arm 60, the arm support 70, and the like. In the connecting unit 49 of the present embodiment, the connecting arm 60 can be connected to the extending groove body 50 from a direction perpendicular to the auxiliary axis A2, but the actuator 80 is moved along the axial direction AD2. In a state where the angle of the connecting arm 60 is changed, the connecting arm 60 can be connected to the extending groove body 50 from an oblique direction. In addition, the connecting arm 60 can be connected in a state where the installation height of the actuator 80 with respect to the installation height of the concave mirror 40 is raised and lowered.

  Even if the angle of the connecting arm 60 is changed, only the contact portions on the spherical contact bodies 64a and 64b are shifted with respect to the bottom surface portion 54 extending around the auxiliary axis A2. For this reason, the four point-like contact states described above are easily maintained, and a force that twists the connection arm 60 when the actuator 80 operates is unlikely to be generated.

  That is, even if the arrangement of the optical components such as the plane mirror 30 is changed in order to realize the optimal optical design for each vehicle type, and the position of the actuator 80 is changed along with the change in the arrangement, the connection form having the same performance is obtained. Can be maintained. In other words, the component shape of the connecting unit 49 is common among the types of vehicles 1 to be mounted. Therefore, the connection configuration of the present embodiment facilitates optimization of the optical design for the vehicle type, and can contribute to reducing the manufacturing cost of the HUD device 100.

  Further, in the case where the axial position 40b of the concave mirror 40 is pulled by the actuator 80 as in the present embodiment, it is not necessary to directly connect the actuator 80 to the rotation axis A1. For this reason, the size of the virtual image VRI in the left-right direction is increased by suppressing the physique enlargement of the HUD device 100 in the axial direction AD1 or by optically designing the concave surface 40 of the concave mirror 40 in the axial direction AD1. be able to.

  The control unit 90 includes an adjustment switch 91 and a control circuit unit 92, as shown in FIG. The adjustment switch 91 is installed outside the housing 10, for example, on a steering handle of the vehicle 1, and can be operated by an occupant. The adjustment switch 91 has, for example, two types of operation members 91a and 91b such as a push type. Specifically, the up operation member 91a is an operation member for moving the display position of the virtual image VRI upward. The down operation member 91b is an operation member for moving the display position of the virtual image VRI downward.

  The control circuit unit 92 is an electronic circuit in which at least one processor, a memory device (for example, a semiconductor memory), an input / output interface, and the like are mounted on a substrate. The processor executes a computer program stored in the memory device based on an electric signal input from the adjustment switch 91 in response to the operation of the operation members 91a and 91b. Thus, the processor outputs an electric signal to the electric motor 81 of the actuator 80 to rotate the motor shaft of the electric motor 81.

(Effects)
The operation and effect of the first embodiment described above will be described again below.

  According to the first embodiment, a pair of contact bodies 64a and 64b provided on one of the axial outer position 40b of the concave mirror 40 as an optical component and the connecting arm 60 is provided at the bottom of the extending groove body 50 provided on the other. At 54, they are in contact with positions around the auxiliary axis A2 at different angles. In such a coupling form of the connecting arm 60 and the outer axis position 40b of the concave mirror 40, when the actuator 80 pulls the outer axis position 40b through the connecting arm 60, the extending groove body 50 is sandwiched between the pair of contact bodies 64a and 64b. In this state, the concave mirror 40 is pulled in the pulling direction and pivots, and its direction is changed. At this time, the pair of contact bodies 64a and 64b slide around the auxiliary axis A2 on the bottom surface portion 54 that extends while curving around the auxiliary axis A2, so that the extension groove 50 and the pair of contact bodies 64a and 64b The relative position in the circumferential direction is shifted. Since the pair of contact bodies 64a and 64b are fitted in the extending grooves 53 forming the bottom surface portion 54, the contact state is easily maintained even if the relative position is shifted in the circumferential direction, and the connecting arm 60 is twisted. The rotation of the connection arm 60 in the direction is restricted. As described above, since the direction of the concave mirror 40 is smoothly changed, the display mode of the virtual image VRI can be suitably adjusted. Therefore, the HUD device 100 as the virtual image display device has the performance required for mounting on the vehicle 1. Can be demonstrated.

  By the way, in a mode in which the extended groove body 50 is sandwiched between the pair of contact bodies 64a and 64b, even if the connecting arm 60 is obliquely coupled to the axial outside position 40b from a direction slightly inclined with respect to the rotation direction RD of the concave mirror 40, It is possible to maintain the state of contact between the pair of contact bodies 64a and 64b with the bottom surface portion 54. Even in the diagonally connected state, the auxiliary mirror A2 is disposed so as to intersect with the rotation direction RD of the concave mirror 40, so that the pair of contact bodies 64a and 64b slide around the auxiliary axis A2 on the bottom surface portion 54, and the concave mirror It is possible to pull the shaft outer position 40b of the forty in the rotational direction RD. Therefore, the connecting arm 60 can be coupled to the outer axis position 40b from a direction corresponding to the arrangement of the actuator 80, so that the degree of freedom of arrangement of the actuator 80 is high. Therefore, it is necessary to arrange the actuator 80 so as to avoid interference with other components and to avoid wasting space, or to enhance the optical performance without being restricted by the arrangement of the actuator 80. It becomes possible. As described above, the HUD device 100 suitable for mounting on the vehicle 1 can be provided.

  According to the first embodiment, each of the contact bodies 64a and 64b is formed in a spherical shape. Regarding the spherical contact bodies 64a and 64b, the curved state at the contact points on the contact bodies 64a and 64b is uniform regardless of the direction in which the contact position with the bottom surface 54 is shifted. Easy to maintain. For example, even if the actuator 80 pulls the connecting arm 60 and the contact position of the pair of contact bodies 64a and 64b shifts in the circumferential direction of the auxiliary shaft A2, a suitable contact state can be maintained. Further, for example, when the angle of the connecting arm 60 is swung in an obliquely connected state, a suitable contact state can be maintained even if the contact positions of the pair of contact bodies 64a and 64b are shifted.

  Further, according to the first embodiment, each of the contact bodies 64a and 64b is in contact with both the inclined bottom surfaces 54a and 54b, respectively. In this way, the pair of contact bodies 64a, 64b and the bottom surface 54 come into contact at a total of four places. Since the pair of inclined bottom surfaces 54a and 54b are inclined so as to decrease in diameter from the side edge portion 53b of the extension groove 53 toward the central portion 53a, the inclined bottom surfaces 54a and 54b are separated from each other at each contact point. The normal force includes a component toward the center 53 a of the elongated groove 53. Each of the contact bodies 64a and 64b which receive such a vertical reaction is guided to the central portion 53a of the extending groove 53 in the axial direction AD2. Therefore, the state where each of the contact bodies 64a and 64b is fitted in the extension groove 53 is easily maintained, and the rotation in the direction in which the connecting arm 60 is twisted by the four contact points including the contact points arranged in the axial direction AD2 is further restricted. Have been. Therefore, the direction of the concave mirror 40 can be changed more smoothly.

  According to the first embodiment, the connecting arm 60 has the rod-shaped portion 61 extending from the actuator 80 side to the concave mirror 40 side. Since the rod-shaped portion 61 allows the actuator 80 to be separated from the concave mirror 40, it is possible to suppress the actuator 80 from interfering with the concave mirror 40.

  Further, according to the first embodiment, the connecting arm 60 is provided with the branch portion 63 that branches from the end of the rod-shaped portion 61 on the concave mirror 40 side, and a pair of contact bodies 64a and 64b are arranged on both sides thereof. . Therefore, the arrangement in which the extended groove body 50 is sandwiched between the pair of contact bodies 64a and 64b can be easily realized.

  Further, according to the first embodiment, the rod-shaped portion 61 has the bent portion 61b that is bent so that the end on the actuator 80 side and the end on the concave mirror 40 side are shifted in the axial direction AD2 of the auxiliary shaft A2. This makes it possible to displace the actuator 80 along the axial directions AD1 and AD2 beyond the angle of the connecting arm 60 with respect to the vertical direction of the rotation axis A1. Therefore, the degree of freedom of arrangement of the actuator 80 can be further increased.

  According to the first embodiment, since the connecting arm 60 is supported by the arm support 70 so as to be displaceable in the pulling direction, the concave mirror 40 can be smoothly rotated.

  Further, according to the first embodiment, the extended groove body 50 is provided at the axial outer position 40b of the concave mirror 40, and the connecting arm 60 is provided with a pair of contact bodies 64a and 64b. In this case, the direction of the auxiliary axis A2 of the extension groove body 50 with respect to the rotation axis A1 is determined without depending on the angle of the connecting arm 60, so that the smooth rotation of the concave mirror 40 can be stably realized. it can.

(Other embodiments)
Although one embodiment has been described above, the present disclosure is not construed as being limited to the embodiment, and can be applied to various embodiments without departing from the gist of the present disclosure.

  Specifically, as a first modification, the bottom surface portion 54 of the extension groove 53 may be formed by one bottom surface 54c. In the example of FIG. 14, the bottom surface 54c of the extending groove 53 is formed in a U-shape in a cross section in the width direction. By setting the radius of curvature at the central portion 53a of the bottom surface 54c to be larger than the radius of curvature of the contact members 64a and 64b, a total of two point-like contacts between the bottom surface 54c and the pair of contact members 64a and 64b are realized. I have.

  As a second modification, a shape of the bottom portion 54 different from that in FIG. 14 can be adopted. In the example of FIG. 15, the bottom surface 54d of the extension groove 53 is formed in a planar shape in a cross section in the width direction. In FIG. 15, the extending groove 53 is formed in a rectangular cross section by forming a wall surface 54e perpendicular to the bottom surface 54d on both side edge portions 53b. Also in this embodiment, a total of two point contacts between the bottom surface 54d and the pair of contact bodies 64a and 64b are realized.

  As a third modification, the extension groove 53 may extend 180 degrees or more around the auxiliary axis A2. For example, the extension groove 53 may extend 360 degrees and be formed in an annular shape. On the other hand, the extension groove 53 may extend less than 180 around the auxiliary axis A2. The extension angle of the extension groove 53 can be appropriately set according to the range of the rotation angle of the concave mirror 40.

  As a fourth modification, the auxiliary axis A2 may be inclined with respect to the rotation axis A1 as long as it is along a direction different from the rotation direction RD of the concave mirror 40. However, if the angle of inclination of the auxiliary shaft A2 with respect to the rotation axis A1 is less than 45 degrees, more preferably less than 30 degrees, the pulling force is easily transmitted efficiently, and the pair of contact bodies 64a and 64b is And the concave mirror 40 can be rotated more smoothly.

  As a fifth modification, as shown in FIG. 16, in the branch portion 63, the distal end portion of the upper portion 63 a and the distal end portion of the lower portion 63 b are joined again, so that the branch portion 63 passes through the extended groove body 50 as a whole. It may be formed in an annular shape.

  As a modified example 6, the bar-shaped portion 61 of the connecting arm 60 may be configured with only the straight portion 61a without having the bent portion 61b.

  As a modification 7, the pair of contact bodies 64a and 64b is not limited to a spherical shape, and may be formed in an elliptical shape or the like.

  As a modified example 8, the connecting arm 60 may be provided with the extended groove body 50 and the concave mirror 40 may be provided with a pair of contact bodies 64a and 64b.

  As a ninth modification, a plane mirror other than the concave mirror 40, a lens, a prism, or the like may be employed as the optical component whose direction can be changed.

  As a tenth modification, the control unit 90 detects the position of the occupant's eye with a camera or the like installed in the vehicle 1 instead of operating the adjustment switch 91, and operates the actuator 80 based on the detection result. It may be.

  Reference Signs List 100 HUD device (virtual image display device), 1 vehicle, 3a projection unit, 40 concave mirror (optical component), 40b axis outside position, 50 extended groove body, 53 extended groove, 54 bottom surface part, 60 connecting arm, 64a, 64b contact body , 80 Actuator, AD1 Axial direction of rotation axis, RD Optical component rotation direction

Claims (8)

A virtual image display device configured to be mounted on a vehicle (1) and displaying a virtual image by projecting display light onto a projection unit (3a),
An optical component (40) that guides the display light to the projection unit, the optical component (40) being formed to be able to change its direction by rotating around a rotation axis (A1) penetrating the inside;
A connecting arm (60) connected to an off-axis position (40b) of the optical component that is arranged off-axis away from the rotation axis;
An actuator (80) that pulls the external position of the shaft in a pulling direction that is different from the axial direction (AD1) of the rotating shaft via the connecting arm so as to change the direction of the optical component. ,
One of the axis outer position of the optical component and the connection arm extends while bending around an auxiliary axis (A2) along a direction different from the rotation direction (RD) of the optical component. An elongated groove body (50) in which an elongated groove (53) having a bottom surface portion (54) facing radially outward of
The other of the axis outer position and the connection arm of the optical component is fitted in the extension groove, so that the extension groove body is sandwiched therebetween, so that angles around the auxiliary axis are different from each other on the bottom surface portion. A virtual image display device having a pair of contact bodies (64a, 64b) that come into contact with each other.   The virtual image display device according to claim 1, wherein each of the contact bodies is formed in a spherical shape. The bottom surface portion has a pair of inclined bottom surfaces (54a, 54b) that incline so as to decrease in diameter from a side edge portion of the extension groove toward a central portion,
The virtual image display device according to claim 1, wherein each of the contact bodies is in contact with both of the inclined bottom surfaces.   4. The virtual image display device according to claim 1, wherein the connecting arm has a rod-shaped portion extending from the actuator side to the optical component side. 5. The connection arm further includes a branch portion (63) that branches off from the end of the rod-shaped portion on the optical component side and is disposed on both sides where the elongated groove is inserted.
5. The virtual image display device according to claim 4, wherein one of the pair of the contact bodies is provided on one of the two sides and one on the other side. 6.   The said rod-shaped part has the bending part (61b) which bends so that the edge part on the said actuator side and the edge part on the said optical component side may shift | deviate in the axial direction (AD2) of the said auxiliary shaft. The virtual image display device as described in the above.   The virtual image display device according to any one of claims 1 to 6, further comprising an arm support (70) that supports the connecting arm so as to be displaceable in the pulling direction.   The virtual image display device according to any one of claims 1 to 7, wherein the one is the position outside the axis of the optical component, and the other is the connection arm.

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