Vehicle display device

Abstract

The present invention comprises: a display unit (10); a movable reflection member (40); a drive unit (50) that rotates the movable reflection member around the axis of a rotary shaft (53) to change the display position of a virtual image; a support member (54) that is fixed to a lower case (70A) and has a groove-shaped bearing part (54a) into which the rotary shaft is fitted; a first elastic member (55) that is fixed to the support member and presses the rotary shaft toward the groove bottom of the bearing part by means of a resilient force toward the groove bottom; and a second elastic member (56) that regulates the displacement of the rotary shaft in the axial direction. The second elastic member has a fitting part (56a) to which a fitted part (73) is fitted in a fitting direction orthogonal to the axis of the rotary shaft, and a flexible piece part (56b) that can undergo bending deformation in the axial direction of the rotary shaft. The flexible piece part keeps the rotary shaft at a prescribed attachment position by a reaction force on a protrusion part (53a) accompanying the bending deformation. An upper case (70C) is provided with a locking part (74) that locks the fitting part and keeps the fitting part in a state of being held in the fitted part.

Description

Vehicle display device

[0001] The present invention relates to a display device for a vehicle.

[0002] Conventionally, vehicles are equipped with a vehicle display device that displays information to be provided to occupants in the vehicle cabin as a virtual image. This vehicle display device is a so-called head-up display device and includes a display unit that emits display information to be projected onto a projection target as display light, a reflecting member that reflects the display light emitted from the display unit and projects the display light onto the projection target, and a housing that accommodates these components. This vehicle display device projects the display light reflected by the reflecting member onto the projection target outside the housing, allowing the occupants to view the display information corresponding to the projected display light as a virtual image. Here, this vehicle display device can perform adjustment control of the virtual image display position, which changes the imaging position (display position) of the virtual image by controlling the rotation of the reflecting member. This type of vehicle display device is disclosed, for example, in Patent Documents 1 and 2 listed below.

[0003] JP 2019-078966 A JP 2022-103700 A

[0004] In a vehicle display device, misalignment of the rotation axis of the reflecting member leads to misalignment of the reflecting member, causing a misalignment of the virtual image display position. For example, the vehicle display device of Patent Document 1 above is provided with a bearing component including a support member having a V-shaped groove into which the rotation axis is fitted, and an elastic member that applies a resilient force toward the bottom of the V-shaped groove to the rotation axis to press the rotation axis against the groove bottom, in order to prevent misalignment of the rotation axis in a direction perpendicular to the axis of the rotation axis. Furthermore, the vehicle display device of Patent Document 2 above is provided with an elastic member that prevents misalignment of the rotation axis of the reflecting member in the axial direction. In this vehicle display device, it is necessary to prevent misalignment of the elastic member in order to prevent misalignment of the rotation axis, and there is room for improvement in this regard.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a vehicle display device that is suitable for suppressing misalignment of a rotation shaft.

[0006] the display unit emits display information into the outer case as display light to be viewed as a virtual image by occupants in a vehicle cabin; one reflecting member or a plurality of reflecting members that reflect the display light emitted from a display of the display unit inside the outer case; one reflecting member or one of the plurality of reflecting members is a movable reflecting member, and a drive unit rotates the movable reflecting member around a rotation shaft to change a display position of the virtual image; a support member that has a groove-shaped bearing portion into which the rotation shaft is fitted and is fixed to the lower case; a first elastic member that is fixed to the support member and applies a resilient force to the rotation shaft toward a groove bottom of the bearing portion to press the rotation shaft toward the groove bottom; and a second elastic member that restricts axial displacement of the rotation shaft. The rotating shaft has a protruding portion that protrudes from the outer peripheral surface, and the second elastic member has a fitting portion that is fitted into the fitting portion of the lower case in a fitting direction perpendicular to the axis of the rotating shaft and held in the fitting portion, and a flexible piece portion that has a cantilever shape with its free end located on the fitting direction side of a fixed end provided on the fitting portion side and has flexibility that allows it to flex and deform in the axial direction of the rotating shaft, and when the fitting portion is held in the fitting portion and the rotating shaft is fitted in a specified mounting position relative to the bearing portion, the free end of the flexible piece portion flexes and deforms due to a force from the protruding portion, and a reaction force associated with the flexural deformation acts on the protruding portion to keep the rotating shaft in the specified mounting position, and the upper case is provided with a locking portion that locks the fitting portion that has moved in the opposite direction to the fitting direction, thereby keeping the fitting portion held in place relative to the fitting portion.

[0007] The vehicle display device according to the present invention can suppress misalignment of the rotation shaft in a direction intersecting the axis with the first elastic member, and can suppress misalignment of the rotation shaft in the axial direction with the second elastic member. In the vehicle display device according to the present invention, the first elastic member is fixed to the lower case via the support member, thereby maintaining the function of the first elastic member in suppressing misalignment of the rotation shaft. Furthermore, in the vehicle display device according to the present invention, the locking portion of the upper case can maintain the mating portion of the second elastic member and the mated portion of the lower case in an engaged state (retained state), thereby maintaining the function of the second elastic member in suppressing misalignment of the rotation shaft. Therefore, the vehicle display device according to the present invention can maintain the rotation shaft in a specified mounting position relative to the bearing portion, making it suitable for suppressing misalignment of the rotation shaft. This prevents misalignment of the movable reflector within the housing, thereby suppressing misalignment of the virtual image display position.

[0008] FIG. 1 is a schematic diagram showing a vehicle display device according to an embodiment. FIG. 2 is a perspective view showing the vehicle display device according to an embodiment. FIG. 3 is an exploded perspective view showing the vehicle display device according to an embodiment, with the outer case partially disassembled. FIG. 4 is an exploded perspective view of the lower case, lower cover, and display unit in the outer case. FIG. 5 is an exploded perspective view showing three reflecting members together with the inner case. FIG. 6 is a perspective view showing a second concave mirror and its associated components. FIG. 7 is a perspective view showing the second concave mirror. FIG. 8 is a perspective view showing a holding member. FIG. 9 is a perspective view showing a bezel member. FIG. 10 is a perspective view showing a drive unit. FIG. 11 is a perspective view showing a bearing component. FIG. 12 is an exploded perspective view showing a bearing component. FIG. 13 is a perspective view illustrating a bearing component with a second elastic member. FIG. 14 is a perspective view illustrating a bearing component with a second elastic member. FIG. 15 is a perspective view illustrating a locking portion of the upper case. FIG. 16 is an exploded perspective view showing the first inner case together with the display unit and the plane mirror. Fig. 17 is an exploded perspective view of the first inner case together with the display unit and the plane mirror as viewed from a different angle, and Fig. 18 is an exploded perspective view of the second inner case together with the first concave mirror and the second concave mirror.

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle display device according to the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiment.

[0010] [Embodiment] One embodiment of a vehicle display device according to the present invention will be described with reference to Figs.

[0011] 1 to 3, reference numeral 1 denotes a vehicle display device according to this embodiment. The vehicle display device 1 is a so-called head-up display device that displays a virtual image of information to be provided to an occupant in the cabin of a vehicle (such as an automobile). The vehicle display device 1 projects display light relating to the display information onto a projection surface Rwf, such as a windshield, within the cabin, and reflects the display light from the projection surface Rwf toward the occupant, thereby allowing the occupant to visually recognize a virtual image of the display information (FIG. 1).

[0012] The vehicular display device 1 includes a display unit 10 that emits display information as display light into an outer case 70 (FIGS. 1 and 4), which is displayed as a virtual image to be viewed by passengers in the vehicle cabin. The display unit 10 includes a backlight (not shown) and a light-transmitting, plate-like display 11. Light irradiated from the backlight onto the display 11 is transmitted through the display 11, and is emitted from the display 11 as display light for display information (FIGS. 1 and 4). For example, a light-transmitting, TFT liquid crystal (thin film transistor liquid crystal) display or the like is used as the display 11.

[0013] Furthermore, this vehicle display device 1 includes one or more reflective members that reflect display light emitted from the display 11 of the display unit 10 within the outer case 70. In this vehicle display device 1, the one or one of the reflective members is a movable reflective member that rotates within the outer case 70. The vehicle display device 1 shown here includes multiple reflective members that reflect the display light emitted from the display 11 within the outer case 70 and project the display light from the emission port 70a of the outer case 70 onto a projection area Rwf within the vehicle cabin. This vehicle display device 1 includes a plane mirror 20, a first concave mirror 30, and a second concave mirror 40 as the multiple reflective members, and the second concave mirror 40 is set as a movable reflective member ( FIGS. 1 , 3 , and 5 ).

[0014] The plane mirror 20 reflects the display light emitted from the display 11 of the display unit 10 inside the outer case 70. The first concave mirror 30 reflects the display light reflected by the plane mirror 20 inside the outer case 70. The second concave mirror 40 reflects the display light reflected by the first concave mirror 30 inside the outer case 70, and projects the display light from an exit port 70a of the outer case 70 onto a projection area Rwf inside the vehicle cabin. The first concave mirror 30 and the second concave mirror 40 are magnifying mirrors that magnify and reflect the incident display light. For example, the first concave mirror 30 and the second concave mirror 40 are aspherical mirrors (free-form mirrors) whose reflective surfaces are concave into an aspherical shape (free-form shape).

[0015] The vehicle display device 1 includes a holding member 45 that holds the movable reflecting member (second concave mirror 40) from the rear surface 40b behind the display light reflecting surface 40a (FIGS. 6 to 8). The holding member 45 is molded from a highly rigid material that is more rigid than the movable reflecting member (second concave mirror 40). For example, in this example, the movable reflecting member (second concave mirror 40) includes a base plate (not shown) molded from a synthetic resin material, and the holding member 45 is molded from a metal material that is more rigid than the synthetic resin material.

[0016] The vehicle display device 1 also includes a bezel member 46 that covers the outer peripheral edge 40c of the reflective surface 40a of the movable reflective member (second concave mirror 40) and sandwiches the movable reflective member (second concave mirror 40) between itself and a holding member 45 (see FIGS. 6, 7, and 9). During manufacturing of the movable reflective member (second concave mirror 40), distortion may occur at the outer peripheral edge 40c. By covering and concealing the outer peripheral edge 40c with the bezel member 46, the vehicle display device 1 can suppress distortion at the outer peripheral edge of the virtual image display. The bezel member 46 is molded from, for example, a synthetic resin material.

[0017] The movable reflecting member (second concave mirror 40) shown here has a main body portion (hereinafter referred to as the "mirror body") 41a formed in a rectangular, aspherical shape (free-form surface shape) (see FIGS. 6 and 7). The movable reflecting member (second concave mirror 40) has a mirror body portion 41a with a reflective surface (i.e., a mirror surface) 40a and a back surface 40b. The outer peripheral edge 40c of the reflective surface 40a of the mirror body portion 41a is covered with a bezel member 46. The movable reflecting member (second concave mirror 40) shown here has clamped portions 41b that protrude from three sides of the mirror body portion 41a and are clamped between a holding member 45 and the bezel member 46 (see FIG. 7). Here, the mirror body portion 41a has plate-shaped clamped portions 41b on two sides located in the vehicle width direction and one side located above the vehicle.

[0018] The holding member 45 shown here has a main body portion 45a formed in a rectangular aspherical shape (free-form surface shape) and disposed opposite the rear surface 40b of the movable reflecting member (second concave mirror 40) (FIG. 8). The holding member 45 shown here has clamping portions 45b that protrude from three sides of the main body portion 45a and clamp the clamped portion 41b of the movable reflecting member (second concave mirror 40) between the main body portion 45a and the bezel member 46 (FIG. 8). Here, the main body portion 45a has clamping portions 45b on two sides located in the vehicle width direction and one side located above the vehicle.

[0019] The bezel member 46 shown here has a square-ring-shaped main body portion (hereinafter referred to as a "frame body portion") 46a that covers the outer peripheral edge portion 40c of the mirror body portion 41a of the movable reflecting member (second concave mirror 40) (FIG. 9). The frame body portion 46a has a square-ring-shaped main wall portion 46a that covers the outer peripheral edge portion 40c of the mirror body portion 41a of the movable reflecting member (second concave mirror 40) from the reflecting surface 40a side. １ and a rectangular annular side wall portion 46a that covers the outer peripheral edge portion 40c of the mirror body portion 41a of the movable reflecting member (second concave mirror 40) from the side end side. ２ The bezel member 46 shown here has a side wall portion 46a of a frame portion 46a for each clamped portion 41b of the movable reflecting member (second concave mirror 40). ２ The frame portion 46a has a side wall portion 46a of the frame body portion 46a, which projects from the frame portion 46a so as to face the clamped portion 41b, and which clamps the clamped portion 41b of the movable reflecting member (second concave mirror 40) between the clamping portion 45b of the holding member 45 and the clamped portion 41b (FIG. 9). ２ In the vehicle, clamping portions 46b are provided on two wall portions located in the vehicle width direction and one wall portion located above the vehicle.

[0020] The clamping portion 45b of the holding member 45 and the clamping portion 46b of the bezel member 46 are fixed with screws at positions other than the clamping portion that clamps the clamped portion 41b of the movable reflecting member (second concave mirror 40). In this example, both ends with the clamping portion in between are fixed with screws.

[0021] Here, the vehicle display device 1 includes a drive unit 50 that rotates a movable reflecting member (second concave mirror 40) around a rotation axis to change the imaging position (display position) of the virtual image (see FIGS. 1, 5, 6, and 10). Here, the movable reflecting member (second concave mirror 40) is rotated around a rotation axis in the vehicle width direction to change the imaging position (display position) of the virtual image in the vehicle up-down direction. The drive unit 50 includes a motor 51 as a drive source, a power transmission mechanism 52 that operates with the output of the motor 51, and a rotary shaft 53 that rotates the movable reflecting member (second concave mirror 40) around its axis with the output of the motor 51 input via the power transmission mechanism 52, with the axial direction of the vehicle width (see FIGS. 1, 6, and 10).

[0022] The power transmission mechanism 52 may be one that directly applies a rotational torque corresponding to the output torque of the motor 51 to the rotation shaft 53. Alternatively, the power transmission mechanism 52 may be a power conversion mechanism that converts the output torque of the motor 51 into a linear force and applies this linear force to the movable reflecting member (second concave mirror 40), thereby rotating the rotation shaft 53 that is positioned eccentrically with respect to the input point of the linear force. The rotation shaft 53 may be provided on the second concave mirror 40, or may be provided on the holding member 45 that holds the second concave mirror 40.

[0023] The rotation shaft 53 shown here is provided on the holding member 45. Therefore, the drive unit 50 rotates the movable reflecting member (second concave mirror 40) around the rotation shaft 53 of the holding member 45 to change the imaging position (display position) of the virtual image. The holding member 45 shown here is provided with a pair of coaxial rotation shafts 53. Each rotation shaft 53 is formed in a columnar or cylindrical shape and protrudes from two clamping portions 45b located on the holding member 45 in the vehicle width direction.

[0024] Hereinafter, one of the rotating shafts 53 will be referred to as the first rotating shaft 53A, and the other rotating shaft 53 will be referred to as the second rotating shaft 53B, as necessary (FIGS. 6 and 8). The first rotating shaft 53A has a protruding portion 53a that protrudes from its outer circumferential surface. This protruding portion 53a is a flange portion that protrudes concentrically from the outer circumferential surface of the first rotating shaft 53A in an annular shape, and is provided at the end of the first rotating shaft 53A.

[0025] The illustrated power transmission mechanism 52 is a power conversion mechanism that converts the output torque of the motor 51 into a linear force, and includes an input portion to which the linear force is input on the movable reflecting member (second concave mirror 40) side. This input portion is provided on the holding member 45. The drive unit 50 applies a linear force corresponding to the output torque of the motor 51 to this input portion, thereby rotating the movable reflecting member (second concave mirror 40) around the axis of the rotation shaft 53 of the holding member 45. Therefore, the input portion is disposed in an eccentric position with respect to the rotation shaft 53.

[0026] The illustrated input receiving portion has a two-part structure, being divided into a first input receiving portion 52a formed on the holding member 45 and a second input receiving portion 52b fixed to the first input receiving portion 52a (FIGS. 8 and 10). The holding member 45 shown here has the first input receiving portion 52a protruding from the remaining side (the side located below the vehicle) where the clamping portion 45b is not provided. The second input receiving portion 52b has an input point where a linear force corresponding to the output torque of the motor 51 is input.

[0027] The motor 51 has an output shaft 51a formed as a threaded shaft (FIG. 10). The power transmission mechanism 52 includes a motor support member 52c that supports the motor 51 and two guide shafts 52d that are arranged parallel to the output shaft 51a of the motor 51 and are fixed to the motor support member 52c (FIG. 10). The motor support member 52c is arranged outside the lower case 70A (described later) together with the motor 51, and is fixed to the lower case 70A from the outside with screws.

[0028] The power transmission mechanism 52 further includes a slider 52e that is movable relative to the two guide shafts 52d in the axial direction of the two guide shafts 52d and that is movable relative to the two guide shafts 52d in the axial direction when it receives a thrust corresponding to the rotation of the output shaft 51a of the motor 51 (FIG. 10). The slider 52e is provided with an input portion 52f that applies the thrust to the second input portion 52b (FIG. 10). The power transmission mechanism 52 further includes an elastic member 52g that causes the second input portion 52b to follow the movement of the slider 52e when a thrust is applied to the slider 52e to move the input portion 52f away from the second input portion 52b (FIG. 10).

[0029] This drive unit 50 rotates the second concave mirror 40 around the rotation axis 53, thereby changing the incident angle of the display light reflected from the first concave mirror 30 onto the second concave mirror 40, and also changing the emission angle of the display light reflected from the second concave mirror 40 toward the projection surface Rwf. By changing the emission angle of the display light from the second concave mirror 40 toward the projection surface Rwf, this drive unit 50 changes the imaging position (display position) of a virtual image related to the display light in the vertical direction of the vehicle.

[0030] The display light projected onto the projection area Rwf is reflected from the projection area Rwf to the eye point EP or the eye box EB, where it is visually recognized by the occupant as a virtual image (see FIG. 1). The eye point EP indicates the position of the occupant's eyes in the vehicle cabin. The eye box EB indicates the range of the eye point EP where the virtual image can be viewed.

[0031] The projection target Rwf refers to the windshield (here, the front windshield Wf) itself or a portion thereof (FIG. 1). The projection target Rwf may also be formed as a half mirror that receives display light from the second concave mirror 40 on a reflective surface, reflects it toward the eye point EP or the eye box EB, and emits light from outside the vehicle toward the occupants. For example, the projection target Rwf as a half mirror may be formed as a semi-transparent film conforming to the curved shape of the windshield (front windshield Wf) and attached to the interior wall surface of the windshield with an adhesive. The projection target Rwf as a half mirror may also be formed as a semi-transparent film conforming to the curved shape of the windshield (front windshield Wf) and sealed together with an intermediate film inside the laminated windshield. The projection target Rwf as a half mirror may also be a semi-transparent coating applied by painting or the like to the interior wall surface of the windshield (front windshield Wf). The projection target portion Rwf may be a combiner that covers the front windshield Wf from the inside of the vehicle compartment.

[0032] The vehicle display device 1 includes a control unit 60 (FIG. 1) that controls the operation of the display unit 10 and the drive unit 50. The control unit 60 controls, for example, the display information (display light) of the display unit 10. The control unit 60 also controls the output of the motor 51 to rotate the second concave mirror 40.

[0033] The vehicle display device 1 includes an outer case 70 and an inner case 80 disposed inside the outer case 70 (see FIGS. 2 and 3). In the vehicle display device 1, the housing is formed by the outer case 70 and the inner case 80.

[0034] In addition to the inner case 80, the outer case 70 accommodates at least the display unit 10, the plane mirror 20, the first concave mirror 30, the second concave mirror 40, and part or all of the drive unit 50. The outer case 70 emits display light from the display 11 of the display unit 10 indoors, and then transmits the reflected display light to the second concave mirror 40 and emits it outdoors toward the projection surface Rwf. The outer case 70 has an opening (hereinafter referred to as the "emission port") 70a through which the display light reflected by the second concave mirror 40 is emitted outdoors (FIGS. 2 and 3). The inner case 80 forms an optical path within the outer case 70 between the display 11 of the display unit 10 and the emission port 70a of the outer case 70.

[0035] The outer case 70 has an opening (hereinafter referred to as the "incident port") 70b that allows display light emitted from the display 11 of the display unit 10 fixed to the outside of the vehicle to enter the vehicle interior, and is equipped with a lower case 70A that holds the plane mirror 20 and the second concave mirror 40 inside the vehicle and is fixed to the vehicle body, and a lower cover 70B that houses the display unit 10 outside the lower case 70A and is fixed to the lower case 70A (Figures 2 to 4).

[0036] The display unit 10 is disposed outside the lower case 70A with the display 11 facing the light entrance 70b and facing the interior of the lower case 70A. The display unit 10 is fixed to the lower case 70A with screws on the outside of the lower case 70A. The lower cover 70B houses the display unit 10 in a manner that covers the exterior of the lower case 70A and is fixed to the lower case 70A with screws.

[0037] The lower case 70A has an opening (hereinafter referred to as the "accommodation opening") 70c that faces upward of the vehicle (see FIGS. 3 and 4). The plane mirror 20, the second concave mirror 40, part or all of the drive unit 50, and the inner case 80 are accommodated in the interior of the lower case 70A through the accommodation opening 70c.

[0038] In this lower case 70A, the plane mirror 20 inside the chamber is sandwiched between it and a first inner case 80A (described later). In this lower case 70A, the peripheral edge of the first concave mirror 30 is placed on the peripheral edge of the accommodation opening 70c, and the first concave mirror 30 is sandwiched between it and an upper case 70C (described later). In this lower case 70A, the rotating shaft 53 on the side of the second concave mirror 40 is held inside the chamber via a bearing component (described later). The lower case 70A is provided with a bearing fixing portion 71 that fixes the bearing component (FIG. 4).

[0039] An outer wall surface of the lower case 70A is provided with a vehicle body fixing portion 72 for fixing to the vehicle body (FIGS. 2 to 4). The lower case 70A is fixed to the vehicle body at the vehicle body fixing portion 72 with screws.

[0040] The outer case 70 further includes an upper case 70C having a light exit port 70a, fixed to the lower case 70A, and sandwiching the first concave mirror 30 between the upper case 70C and the lower case 70A, and a transparent cover 70D that closes the light exit port 70a (FIGS. 2 and 3). The assembled lower case 70A and upper case 70C form an internal space in the outer case 70.

[0041] The upper case 70C covers the plane mirror 20, the second concave mirror 40, part or all of the drive unit 50, and the inner case 80 housed in the lower case 70A from the outside, and closes the accommodation opening 70c of the lower case 70A by sandwiching the peripheral edge of the first concave mirror 30 placed on the peripheral edge of the accommodation opening 70c. The upper case 70C is fixed to the lower case 70A with screws while closing the accommodation opening 70c. The upper case 70C has an emission opening 70a above the vehicle. The cover 70D is attached to the upper case 70C in a manner that closes the emission opening 70a.

[0042] The vehicular display device 1 is housed in an instrument panel Pi in a vehicle cabin with its cover 70D exposed (FIG. 1). In this vehicular display device 1, display light reflected by the second concave mirror 40 is emitted from the cover 70D to the outside of the outer case 70 and projected onto a projection target Rwf located beyond the second concave mirror 40, where the display light is reflected by the projection target Rwf toward the eye point EP or the eye box EB.

[0043] Here, we will explain the bearing parts for the rotating shaft 53 on the second concave mirror 40 side. These bearing parts are configured as follows to rotatably support the rotating shaft 53, and are fixed to a bearing fixing portion 71 inside the lower case 70A. The drive unit 50 is provided with these bearing parts for each rotating shaft 53.

[0044] The vehicle display device 1 includes a support member 54 as one of the components of the bearing assembly, which has a groove-shaped bearing portion 54a into which the rotation shaft 53 is fitted and is fixed to the lower case 70A (FIGS. 6 and 11 to 14).

[0045] The bearing portion 54a has a bottom portion 54a on which a groove bottom is formed. １ And this bottom portion 54a １ a first side wall portion 54a projecting from the lower case 70A toward the receiving opening 70c ２ and the bottom portion 54a １ the first side wall portion 54a ２ a second side wall portion 54a disposed opposite to the ３ 11 and 12. The bearing portion 54a has a bottom portion 54a. １ and the first side wall portion 54a ２ and the second side wall portion 54a ３ The rotary shaft 53 is fitted into the V-shaped or U-shaped groove portion surrounded by the arrows 54a and 54b. Here, a V-shaped groove-shaped bearing portion 54a is formed.

[0046] The support member 54 has a bottom portion 54a on the groove bottom side of the bearing portion 54a. １Each support member 54 has bottom wall portions 54b that protrude perpendicular to the axis of the rotary shaft 53 ( FIGS. 11 and 12 ). To facilitate assembly within the lower case 70A, the support member 54 has grip portions 54c that protrude from the bottom wall portion 54b toward the receiving opening 70c within the lower case 70A ( FIGS. 11 and 12 ). For example, an operator may grasp the grip portions 54c and place the bottom wall portion 54b on the bearing fixing portion 71 inside the lower case 70A. The bottom wall portions 54b of the support member 54 are fixed to the bearing fixing portion 71 with screws.

[0047] The vehicle display device 1 is fixed to the support member 54 and includes a first elastic member 55 as one of the components of the bearing part, which applies a resilient force to the rotating shaft 53 toward the groove bottom of the bearing portion 54a, thereby pressing the rotating shaft 53 toward the groove bottom (Figures 6 and 11 to 14).

[0048] The first elastic member 55 shown here is a metal leaf spring molded into a crank shape ( FIGS. 11 and 12 ). The first elastic member 55 has a first arm 55a at one end resting on the bottom wall 54b of the support member 54, and is screwed together with the bottom wall 54b to the bearing fixing portion 71 of the lower case 70A. When the first elastic member 55 is fixed in the fixed state, it receives force from the rotating shaft 53 placed on the groove bottom of the bearing portion 54a, causing the second arm 55b at the other end to flex and deform toward the accommodating opening 70c of the lower case 70A. As a result of this flexural deformation, the first elastic member 55 exerts a reaction force (resilience) on the rotating shaft 53 toward the groove bottom of the bearing portion 54a.

[0049] In this vehicle display device 1, a bearing component is formed by the support member 54 and the first elastic member 55. Therefore, in this vehicle display device 1, even if an external force acting on the rotation shaft 53 in a direction intersecting the axis of the rotation shaft 53, the first elastic member 55 presses the rotation shaft 53 toward the groove bottom of the bearing portion 54a, thereby preventing the rotation shaft 53 from shifting in the intersecting direction.

[0050] In this vehicle display device 1, when an external force acting on the rotation shaft 53 in a direction intersecting the axis is applied, the first elastic member 55 that receives the force from the rotation shaft 53 is prevented from deforming to a plastic region. ３ The accommodation portion 54d is provided in the interior space of the first elastic member 55 (FIGS. 11 and 12). The accommodation portion 54d has an interior space that allows the first elastic member 55 to flex and deform within its elastic range while preventing the first elastic member 55 from deforming in its plastic range. In the accommodation portion 54d, when the first elastic member 55 flexes and deforms within its elastic range, the end of the second piece 55b moves within the interior space. In the accommodation portion 54d, the end of the second piece 55b is engaged with the inner wall surface of the interior space, thereby preventing the first elastic member 55 from deforming in its plastic range.

[0051] The vehicle display device 1 further includes a second elastic member 56 as one of the components of the bearing assembly, which restricts the axial displacement of the rotating shaft 53 (here, the first rotating shaft 53A) (Figures 6, 13 and 14).

[0052] The second elastic member 56 shown here is a metal leaf spring. The second elastic member 56 has a fitting portion 56a that fits into the fitting portion 73 of the lower case 70A in a fitting direction perpendicular to the axis of the rotating shaft 53 and is held by the fitting portion 73, and a flexible piece 56b that has a cantilever shape with its free end located on the fitting direction side of the fixed end provided on the fitting portion 56a side and that has flexibility that allows it to flex and deform in the axial direction of the rotating shaft 53 ( FIGS. 13 and 14 ).

[0053] The fitting portion 56a is fitted into the fitted portion 73 of the lower case 70A with the fitting direction aligned with the assembly direction when the upper case 70C is assembled to the lower case 70A. The fitted portion 73 is formed as a convex portion protruding toward the accommodating opening 70c in the lower case 70A. The fitting portion 56a is formed as a concave portion that matches the shape of the fitted portion 73 and into which the fitted portion 73 is inserted and fitted. For example, the fitted portion 73 shown here is formed as a rectangular, one-piece convex portion protruding toward the accommodating opening 70c in the lower case 70A. The fitting portion 56a is formed in a clip shape that clamps each wall surface of the fitted portion 73 inserted and fitted. The fitting portion 56a has a one-piece first clamping piece 56a that applies a reaction force accompanying bending deformation to one wall surface of the fitted portion 73. １ and a second clamping piece 56a having a one-piece shape that applies a reaction force caused by the deflection deformation to the other wall surface of the fitted portion 73. ２ The fitting portion 56a has the first clamping piece 56a. １ and the second clamping piece 56a ２ on the receiving opening 70c side. ３ (FIGS. 13 and 14).

[0054] The flexible piece 56b is connected to the second clamping piece 56a of the fitting portion 56a. ２ The flexible piece 56b has a fixed end at the end facing in the mating direction and a free end at the end protruding from the fixed end in the mating direction. When the mating portion 56a is held by the mated portion 73 and the rotating shaft 53 is fitted into the bearing portion 54a at a specified mounting position, the free end of the flexible piece 56b is subjected to a force from the protruding portion 53a of the rotating shaft 53 and is thereby flexibly deformed. A reaction force resulting from this flexural deformation acts on the protruding portion 53a, thereby maintaining the rotating shaft 53 in the specified mounting position.

[0055] The free end of the flexible piece 56b is provided with a shaft insertion groove 56b into which the rotary shaft 53 is inserted in the direction opposite to the fitting direction. １ 13 and 14. Accordingly, the shaft insertion groove 56b is provided on the free end side of the flexible piece 56b. １ A pair of pressing pieces 56b are placed between them. ２ is formed (FIG. 14). ２The pressing piece 56b is disposed opposite the protruding portion 53a of the rotary shaft 53 in the axial direction of the rotary shaft 53. ２ The flexible piece 56b has a convex mountain shape that projects toward the protruding portion 53a, and the apex of the flexible piece 56b abuts against the protruding portion 53a. ２ The peaks of the respective peaks receive force from the protruding portion 53a of the rotary shaft 53, and the pair of pressing pieces 56b ２ The flexible piece portion 56b is deformed in the axial direction of the rotary shaft 53. ２ The peaks of the respective peaks exert a reaction force on the protruding portion 53a due to the bending deformation, thereby maintaining the rotary shaft 53 in a specified mounting position.

[0056] Here, the second elastic member 56 is fitted into the fitted portion 73 of the lower case 70A along the fitting direction by fitting the fitting portion 56a into the shaft insertion groove 56b of the flexible piece portion 56b in the direction opposite to the fitting direction. １ After the rotary shaft 53 is inserted into the pair of pressing pieces 56b at both ends, ２ The second elastic member 56 is simply pressed in the axial direction against the protruding portion 53a of the rotary shaft 53. Therefore, if an external force such as vibration becomes excessive, the second elastic member 56 may move in the direction opposite to the fitting direction, causing the fitting portion 56a to come off the fitted portion 73 of the lower case 70A.

[0057] Therefore, the upper case 70C is provided with a locking portion 74 that locks the fitting portion 56a that has moved in the direction opposite to the fitting direction, thereby keeping the fitting portion 56a held by the fitted portion 73 (FIG. 15). This locking portion 74 is positioned opposite the fitting portion 56a that is positioned in the fitting direction relative to itself when the lower case 70A and the upper case 70C are in the assembled position. This locking portion 74 is positioned opposite the fitting portion 56a with a gap between it and the fitting portion 56a within a range that does not release the fitted state (held state) between the fitting portion 56a and the fitted portion 73. Here, the locking portion 74 is positioned so that it faces the connecting wall 56a of the fitting portion 56a. ３ When the fitting portion 56a moves in the direction opposite to the fitting direction, the connecting wall 56a ３is locked to the locking portion 74. As a result, in this vehicle display device 1, it is possible to prevent the rotation shaft 53 from being displaced in the axial direction from the specified mounting position.

[0058] The inner case 80 is fixed to the lower case 70A within the chamber of the lower case 70A. The inner case 80 sandwiches the plane mirror 20 between itself and the lower case 70A. The inner case 80 includes a first inner case 80A that is fixed to the lower case 70A within the chamber of the lower case 70A and sandwiches the plane mirror 20 within the chamber of the lower case 70A between itself and the lower case 70A, and a second inner case 80B that is fixed to the lower case 70A within the chamber of the lower case 70A (FIGS. 3 and 5).

[0059] The first inner case 80A has a first internal space 81a (FIGS. 5, 16, and 17) that defines an optical path between the display 11 and the plane mirror 20 and an optical path between the plane mirror 20 and the first concave mirror 30. The first inner case 80A also has a first opening 81b, a second opening 81c, and a third opening 81d (FIGS. 5, 16, and 17).

[0060] The first opening 81b is disposed opposite the display 11 and allows display light emitted from the display 11 to enter the first internal space 81a. The first opening 81b is disposed opposite the light entrance 70b of the lower case 70A inside the lower case 70A.

[0061] The second opening 81c has an opening periphery that sandwiches the periphery of the plane mirror 20 between itself and the lower case 70A, exposing the plane mirror 20 to the first internal space 81a. Therefore, the second opening 81c allows the display light from the display 11 that has entered the first internal space 81a to be incident on the plane mirror 20, and the display light reflected by the plane mirror 20 to be emitted toward the first concave mirror 30.

[0062] The third opening 81d allows the display light reflected by the plane mirror 20 to exit the first internal space 81a toward the first concave mirror 30.

[0063] The first inner case 80A is fixed to the lower case 70A with screws, with the plane mirror 20 sandwiched between the first inner case 80A and the lower case 70A.

[0064] The second inner case 80B has a second internal space 82a (FIGS. 5 and 18) that forms an optical path between the plane mirror 20 and the first concave mirror 30, an optical path between the first concave mirror 30 and the second concave mirror 40, and an optical path between the second concave mirror 40 and the projection target Rwf. The second inner case 80B has a first opening 82b, a second opening 82c, a third opening 82d, and a fourth opening 82e (FIGS. 5 and 18).

[0065] The first opening 82b is disposed opposite the third opening 81d of the first inner case 80A, so that the first opening 82b allows the display light reflected by the plane mirror 20 toward the first concave mirror 30 to enter the second internal space 82a.

[0066] The second opening 82c is disposed opposite the first concave mirror 30. This allows the second opening 82c to allow the display light from the plane mirror 20 that has entered the second internal space 82a to be incident on the first concave mirror 30, and also allows the display light reflected by the first concave mirror 30 to be emitted toward the second concave mirror 40.

[0067] The third opening 82d is disposed opposite the second concave mirror 40. This allows the third opening 82d to allow the display light reflected by the first concave mirror 30 to be incident on the second concave mirror 40, and to allow the display light reflected by the second concave mirror 40 to be emitted toward the projection portion Rwf.

[0068] The fourth opening 82e is disposed opposite the light exit port 70a of the upper case 70C and the cover 70D, and emits the display light reflected by the second concave mirror 40 out of the second internal space 82a toward the projection portion Rwf.

[0069] The second inner case 80B is fixed to the lower case 70A with screws.

[0070] As described above, the vehicle display device 1 of this embodiment can suppress misalignment of the rotation shaft 53 in a direction intersecting the axis by the first elastic member 55, and can suppress misalignment of the rotation shaft 53 in the axial direction by the second elastic member 56. In the vehicle display device 1 of this embodiment, the first elastic member 55 is fixed to the lower case 70A via the support member 54, so the function of the first elastic member 55 in suppressing misalignment of the rotation shaft 53 can be maintained. Furthermore, in the vehicle display device 1 of this embodiment, the locking portion 74 of the upper case 70C can keep the fitting portion 56a of the second elastic member 56 and the fitted portion 73 of the lower case 70A in a fitted state (retained state), so the function of the second elastic member 56 in suppressing misalignment of the rotation shaft 53 can be maintained. Therefore, the vehicle display device 1 of this embodiment can maintain the rotating shaft 53 in the specified mounting position relative to the bearing portion 54a, making it suitable for suppressing positional deviation of the rotating shaft 53. This prevents positional deviation of the movable reflective member (second concave mirror 40) within the housing, thereby suppressing deviation in the virtual image display position.

[0071] Furthermore, in the vehicle display device 1 of this embodiment, the fitting direction of the second elastic member 56 with the fitting portion 73 is aligned with the assembly direction of the upper case 70C with respect to the lower case 70A. Therefore, in the vehicle display device 1 of this embodiment, by assembling the upper case 70C to the lower case 70A, it is possible to create a state in which the second elastic member 56 can be locked by the locking portion 74 of the upper case 70C.

[0072] REFERENCE SIGNS LIST 1 Vehicle display device 10 Display unit 11 Display 20 Plane mirror (reflecting member) 30 First concave mirror (reflecting member) 40 Second concave mirror (movable reflecting member) 50 Drive unit 51 Motor 52 Power transmission mechanism 52a First input-receiving portion 52b Second input-receiving portion 53 Rotation shaft 53A First rotation shaft 53B Second rotation shaft 53a Protrusion 54 Support member 54a Bearing portion 55 First elastic member 56 Second elastic member 56a Fitting portion 56b Flexible piece portion 56b １Shaft insertion groove 70 Outer case 70A Lower case 70C Upper case 73 Fitted portion 74 Locking portion Rwf Projected portion

Claims

1. An outer case that forms an internal space with a lower case and an upper case that are assembled together; a display unit that emits display information into the outer case as display light to be viewed as a virtual image by occupants in the vehicle cabin; one reflecting member or multiple reflecting members that reflect the display light emitted from the display of the display unit inside the outer case; a drive unit that rotates the one reflecting member or one of the multiple reflecting members as a movable reflecting member around the axis of a rotation shaft to change the display position of the virtual image; a support member that has a groove-shaped bearing portion into which the rotation shaft is fitted and is fixed to the lower case; a first elastic member that is fixed to the support member and that applies a resilient force toward the bottom of the groove of the bearing portion to the rotation shaft, pressing the rotation shaft toward the bottom of the groove; and a second elastic member that restricts axial displacement of the rotation shaft, wherein the rotation shaft has a protrusion that protrudes from the outer circumferential surface, the second elastic member has a fitting portion that fits into the fitting portion of the lower case in a fitting direction perpendicular to the axis of the rotating shaft and is held by the fitting portion, and a flexible piece portion that has a cantilever shape with a free end located on the fitting direction side of a fixed end provided on the fitting portion side and has flexibility that allows it to flex and deform in the axial direction of the rotating shaft, when the fitting portion is held by the fitting portion and the rotating shaft is fitted in a specified mounting position with respect to the bearing portion, the free end of the flexible piece portion receives a force from the protruding portion and flexes and deforms, and a reaction force associated with the flexural deformation acts on the protruding portion to hold the rotating shaft at the specified mounting position, and the upper case is provided with a locking portion that locks the fitting portion that has moved in a direction opposite to the fitting direction, thereby keeping the fitting portion held in place relative to the fitting portion.

2. A vehicle display device as described in claim 1, wherein the engaging portion is fitted into the engaged portion of the lower case with the engaging direction aligned with the assembly direction when the upper case is assembled to the lower case, and the locking portion is positioned opposite the engaging portion that is positioned in the engaging direction relative to it when the lower case and the upper case are in the completed assembly position.

3. A vehicle display device as described in claim 1, wherein the protrusion is a flange portion that protrudes in a concentric ring shape from the outer peripheral surface of the rotating shaft, and the free end side of the flexible piece portion is provided with a shaft insertion groove into which the rotating shaft is inserted in the direction opposite to the fitting direction.

4. The vehicle display device according to claim 1, 2 or 3, wherein the drive unit comprises a motor as a drive source and a power transmission mechanism that operates on the output of the motor, the power transmission mechanism being a power conversion mechanism that converts the output torque of the motor into a linear force, and comprising an input part on the movable reflecting member side to which the linear force is input, the input part being positioned at an eccentric position relative to the rotation axis.

Images