Mirror unit and head-up display device

Abstract

To provide a mirror unit capable of reducing abrasion caused by the rotation of a mirror and a head-up display device.SOLUTION: A mirror unit 50 includes a mirror body part 55 which reflects display light L, a shaft part 82 which extends along a rotation axis AX of the mirror body part 55 and is supported rotatably around the rotation axis AX together with the mirror body part 55, and a wire spring 81 which presses the shaft part 82 in a radial direction R and a thrust direction S of the shaft part 82 by elastic force, in such a state that the shaft part 82 is supported rotatably around the rotation axis AX. A head-up display device 100 includes the mirror unit 50 and a display unit 20 which emits the display light L to the mirror unit 50. The mirror unit 50 displays a virtual image V by reflecting the display light L from the display unit 20 to a windshield 201.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present disclosure relates to a mirror unit and a head-up display device. [Background technology]

[0002] The mirror unit described in Patent Document 1 is configured so that the elastic force of a leaf spring presses a supported portion of a reflecting member against a supporting portion. Moreover, the head-up display device described in Patent Document 2 is configured so that the supported portion and the supporting portion of the reflecting portion are pressed against each other by the elastic force of a leaf spring, which is an elastic member having a U-shaped cross section. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-78966 A [Patent Document 2] JP 2016-180796 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the configurations described in Patent Documents 1 and 2, the bearing holds the shaft in point contact or surface contact with an extremely small area, so that either the shaft or the bearing, or both, are relatively susceptible to wear as the mirror rotates.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and aims to provide a mirror unit and a head-up display device that can reduce wear caused by rotation of the mirror. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, a mirror unit according to a first aspect of the present disclosure comprises a mirror body that reflects light, a shaft portion extending along a rotation axis of the mirror body portion and supported rotatably around the rotation axis together with the mirror body portion, a pressing portion that presses the shaft portion in at least a thrust direction of the shaft portion by elastic force while the shaft portion is supported rotatably around the rotation axis, and a positioning portion that receives the shaft portion in the thrust direction, wherein the positioning portion has a circular ring shape with an opening facing the thrust direction, and forms a positioning protrusion that contacts the shaft portion along a latitude line of the circular ring shape.

[0007] In order to achieve the above object, a head-up display device according to a second aspect of the present disclosure includes the mirror unit and a display that emits the light toward the mirror unit, and the mirror unit displays a virtual image by reflecting the display light from the display toward a projected member. Effect of the Invention

[0008] According to the present disclosure, in a mirror unit and a head-up display device, wear caused by rotation of the mirror can be reduced. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic diagram of a head-up display device according to an embodiment of the present disclosure. [Diagram 2] 1 is a partial perspective view of a head-up display device according to an embodiment of the present disclosure, in which an upper case portion and a mirror main body portion are omitted. [Diagram 3] 1 is a partial perspective view of a head-up display device in which an upper case portion is omitted according to an embodiment of the present disclosure. [Figure 4] 1 is a partial side view of a head-up display device in which a lower case portion is omitted according to an embodiment of the present disclosure. [Diagram 5] 1 is a perspective view of a pair of collar pressing portions, a mirror shaft mechanism, a shaft support portion, and a spring housing portion according to an embodiment of the present disclosure. FIG. [Figure 6] 2 is a perspective view of a collar pressing portion, a mirror shaft mechanism, a shaft support portion, and a spring housing portion according to an embodiment of the present disclosure. FIG. [Figure 7] FIG. 2 is an exploded perspective view of a mirror axis mechanism, an axis support portion, and a spring housing portion according to an embodiment of the present disclosure. [Figure 8] 2 is a cross-sectional view of a shaft portion, an interposition member, a wire spring, and a spring receiving portion according to an embodiment of the present disclosure. [Figure 9] FIG. 13 is a perspective view of a cut spring housing and wire spring according to one embodiment of the present disclosure. [Figure 10] 4 is a cross-sectional view of a collar pressing portion, a mirror shaft mechanism, a shaft support portion, and a spring housing portion according to an embodiment of the present disclosure. FIG. [Figure 11] 4 is a cross-sectional view of a collar pressing portion, a mirror shaft mechanism, a shaft support portion, and a spring housing portion according to an embodiment of the present disclosure. FIG. [Figure 12] 13 is a plan view of a shaft portion, a collar, an interposition member, a wire spring, and a spring accommodating portion according to a modified example of the present disclosure. FIG. [Figure 13] 13 is a front view of a shaft portion, a collar, an interposition member, a wire spring, and a spring accommodating portion according to a modified example of the present disclosure. FIG. [Figure 14] 13 is a side view of a shaft portion, a collar, an interposition member, a wire spring, and a spring accommodating portion according to a modified example of the present disclosure. FIG. [Figure 15] FIG. 1 is a perspective view of a collar according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A mirror unit and a head-up display device according to an embodiment of the present disclosure will be described with reference to the drawings. In this embodiment, the head-up display device is mounted on an automobile. As shown in FIG. 1, the head-up display device 100 projects display light L onto a windshield 201, which is an example of a projection target member, to display a plurality of virtual images V including vehicle information.

[0011] Next, the configuration of the head-up display device 100 will be described. As shown in FIG. 1, the head-up display device 100 includes a mirror unit 50 including mirror axis mechanisms 80L and 80R, a folding mirror 60, a display 20, a mirror drive mechanism 70, and a case 30.

[0012] The display 20 emits display light L that displays an image. The display 20 may be a type having a liquid crystal panel and a lighting device, or may be a type having a digital micro mirror device (DMD) element or the like. It may be of a type having a reflective display element and a projector.

[0013] The folding mirror 60 reflects the display light L emitted from the display 20 toward the mirror unit 50. The folding mirror 60 is located above the display 20, and the reflective surface of the folding mirror 60 faces toward the front and lower direction of the vehicle. The folding mirror 60 is a plane mirror or a concave mirror. The folding mirror 60 may be omitted.

[0014] The mirror unit 50 reflects the display light L reflected by the folding mirror 60 toward the windshield 201. The reflecting surface 55a of the mirror unit 50 faces toward the rear and upper direction of the vehicle. The display light L reflected by the windshield 201 reaches a viewer (mainly the driver). A specific configuration of the mirror unit 50 will be described later.

[0015] The mirror drive mechanism 70 rotates the mirror unit 50 around a rotation axis AX. The rotation axis AX extends along the vehicle width direction (the direction perpendicular to the plane of FIG. 1 ). The mirror drive mechanism 70 includes, for example, a motor and a conversion mechanism that converts the rotational force of the motor into linear motion, and transmits the linear motion converted by the conversion mechanism to the mirror unit 50 to rotate the mirror unit 50. Rotate around the axis of rotation AX.

[0016] 1, the case 30 is hollow and made of light-shielding resin or metal. The case 30 includes a lower case portion 31 and an upper case portion 32. The upper case part 32 is formed as a lid part that closes the opening of the lower case part 31. The upper case part 32 has a window part 32a made of a light-transmitting member through which the display light L reflected by the mirror unit 50 passes.

[0017] 4 and 5, the upper case portion 32 is provided with a pair of collar pressing portions 33L, 33R that press a collar 87 that corresponds to a bearing, described later, of the mirror unit 50. The pair of collar pressing portions 33L, 33R are located on the outer periphery of a window portion 32a on the inner surface of the upper case portion 32, and are disposed on both sides in the direction along the rotation axis AX via the window portion 32a. Each of the pair of collar pressing portions 33L, 33R is in the form of a plate extending downward, and the lower end portion contacts the upper portion of the outer periphery of the collar 87.

[0018] 1, the lower case 31 is formed in a box shape with a bottom that opens upward. The lower case 31 accommodates a mirror unit 50, a folding mirror 60, a display 20, and a mirror drive mechanism 70.

[0019] As shown in FIG. 2, the lower case portion 31 includes a pair of spring accommodating portions 35L, 35R and a pair of shaft supporting portions 36L, 36R. When viewed from the viewer, the spring accommodating portion 35L and the shaft support portion 36L are located at the left end portion of the bottom surface 31B of the lower case portion 31. When viewed from the viewer, the spring accommodating portion 35R and the shaft support portion 36R are located at the right end portion of the bottom surface 31B of the lower case portion 31. The bottom surface 31B of the lower case portion 31 is the surface that faces the back side of the mirror unit 50, and is inclined upward toward the front of the vehicle.

[0020] The pair of spring accommodating portions 35L, 35R each accommodate a wire spring 81, which will be described later. The pair of spring accommodating portions 35L, 35R each extend along the vehicle front-rear direction and are provided at positions spaced apart in the vehicle width direction. The pair of spring accommodating portions 35L, 35R are parallel to each other. Each of the spring accommodating portions 35L, 35R has a spring accommodating hole 35h that is long in the vehicle front-rear direction in the bottom surface 31B of the lower case portion 31. As shown in FIG. 9, the spring accommodating hole 35h has a substantially U-shaped cross section.

[0021] As shown in FIG. 6, the spring accommodating portion 35L includes first spring support portions 35a, 35b, 35c, and 35d, and as shown in FIG. 8, second spring support portions 35e and 35f. 6 and 9, the first spring support portions 35a and 35b each clamp a first end portion of the wire spring 81 from the width direction (radial direction) of the wire spring 81. The first spring support portions 35a and 35b are located on side surfaces within the spring accommodating hole 35h and face each other in the width direction of the wire spring 81. When viewed from the depth direction of the spring accommodating hole 35h, the first spring support portions 35a and 35b form a convex shape (a triangular convex shape in this example) that protrudes from the outer circumferential surface of the wire spring 81. The first spring support portions 35c and 35d each clamp the second end of the wire spring 81 from the width direction (radial direction) of the wire spring 81. The first spring support portions 35c and 35d are located on side surfaces within the spring accommodating hole 35h and face each other in the width direction of the wire spring 81. The first spring support portions 35c and 35d form a convex shape (a triangular convex shape in this example) that protrudes from the outer circumferential surface of the wire spring 81 when viewed from the depth direction of the spring accommodating hole 35h.

[0022] 8, the second spring support portions 35e and 35f are located on the bottom surface of the spring accommodating hole 35h and have a convex shape (in this example, a semicircular convex shape when viewed from the width direction of the wire spring 81) that contacts the first and second ends of the wire spring 81. As the height of the second spring support portions 35e and 35f relative to the bottom surface of the spring accommodating hole 35h increases, the force that the wire spring 81 applies to the shaft portion 82 via the interposed member 85 increases. 7, the second spring support portion 35e extends in the width direction of the linear spring 81 so as to connect the first spring support portions 35a and 35b. The second spring support portion 35f extends in the width direction of the linear spring 81 so as to connect the first spring support portions 35c and 35d.

[0023] As shown in FIG. 2, the shaft support parts 36L, 36R rotatably support a pair of shaft parts 82 located on both sides of the rotation axis AX of the mirror unit 50 via a collar 87 described later. The shaft support parts 36L, 36R are erected on the bottom surface 31B of the lower case part 31. The shaft support parts 36L, 36R are arranged to sandwich the spring accommodating parts 35L, 35R from both sides in the vehicle width direction. The shaft support part 36L is located at the center of the spring accommodating part 35L in the longitudinal direction. The shaft support part 36R is located at the center of the spring accommodating part 35R in the longitudinal direction.

[0024] As shown in FIG. 7, the shaft support portion 36L includes collar accommodating holes 36a and 36b. The collar accommodating holes 36a and 36b are formed on the upper end surface of the shaft support portion 36L. The collar accommodating holes 36a and 36b are arranged so as to be connected in a direction along the rotation axis AX, and are semicircular holes with different diameters that open upward. The collar accommodating hole 36a is located on the outer side (the side farther from the shaft portion 82) than the collar accommodating hole 36b, has a smaller diameter than the collar accommodating hole 36b, and is formed to be thicker in the direction along the rotation axis AX. The centers of the collar accommodating holes 36a and 36b are formed to coincide with the rotation axis AX. The shaft support portion 36R is configured symmetrically with respect to the direction along the rotation axis AX in the same manner as the shaft support portion 36L, and therefore a description thereof will be omitted.

[0025] Next, a specific configuration of the mirror unit 50 will be described. 3, the mirror unit 50 includes a mirror body 55 and mirror axis mechanisms 80L and 80R. The mirror body 55 is a concave mirror that is long in the direction along the rotation axis AX. The mirror body 55 includes a mirror holder 55h that is a plate-like member that is concavely curved in the direction along the rotation axis AX and in the direction perpendicular to the rotation axis AX, and a reflecting surface 55a that reflects the display light and is formed on the concave surface of the mirror holder 55h.

[0026] The mirror axis mechanisms 80L and 80R are located on both sides of the mirror main body 55 in the direction along the rotation axis AX, and support the mirror main body 55 rotatably about the rotation axis AX. 6 and 7, the mirror axis mechanism 80L includes a wire spring 81, an axis portion 82, an intervening member 85, and a collar 87. The wire spring 81 is made of metal, and the axis portion 82, the intervening member 85, and the collar 87 are each made of resin.

[0027] The wire spring 81 is made of a metal material that extends linearly. The wire spring 81 is accommodated in the spring accommodating portion 35L. More specifically, a first end of the wire spring 81 is sandwiched between the first spring support portions 35a and 35b in a state of contact with the second spring support portion 35e. A second end of the wire spring 81 is sandwiched between the first spring support portions 35c and 35d in a state of contact with the second spring support portion 35f. In this way, both ends of the wire spring 81 are supported by the spring accommodating portion 35L, and an elastic force can be generated in the center of the wire spring 81.

[0028] As shown in FIG. 3, the shaft portion 82 has a generally cylindrical shape extending on the rotation axis AX, and is connected to the side surface of the mirror holder 55h. As shown in FIG. 7, the shaft portion 82 includes a collar receiving portion 82a, a shaft main body portion 82b, and a shaft protrusion portion 82c. Shaft body 82b has a generally cylindrical shape extending along rotation axis AX. A first end surface (the left end surface in FIG. 7) of shaft body 82b is connected to a side surface of mirror holder 55h (see FIG. 3), and a second end surface (the right end surface in FIG. 7) of shaft body 82b is connected to collar housing portion 82a. Collar receiving portion 82a is generally semispherical, and an apex of the generally semispherical shape is connected to the second end face of shaft body portion 82b. Collar receiving portion 82a is received in collar 87 so as to be slidable and rotatable about rotation axis AX. The shaft protrusion 82c is formed on the outer peripheral surface of the shaft main body 82b. The shaft protrusion 82c extends in a circumferential direction centered on the rotation axis AX and forms a triangle when viewed in the circumferential direction. The shaft protrusion 82c has an inclined surface 82d formed on the side opposite the collar accommodating portion 82a of the shaft 82. The inclined surface 82d inclines toward the radially outward side of the shaft 82 as it approaches the collar accommodating portion 82a in the direction along the rotation axis AX. The inclined surface 82d is a surface that comes into contact with an inclined surface 85e of the intervening member 85, which will be described later.

[0029] 7 and 10, the collar 87 is a sliding bearing that rotatably supports the shaft portion 82. The collar 87 includes a tubular portion 87a, a flange portion 87b, and a bottom portion 87c. The tubular portion 87a is cylindrical with the rotation axis AX as its center. As shown in FIG. 10, the cylindrical portion 87a has a positioning protrusion 87t (see FIGS. 10 and 15) that is located at a bottom portion 87c of the cylindrical portion 87a and that comes into contact with the shaft portion 82 housed in the collar 87. The positioning protrusion 87t has a circular ring shape (a circular ring surface, a ring surface, a torus surface, a toroid) with an opening facing the thrust direction S. A closed curve along the major radius of the circular ring shape (e.g., latitude line 87l shown by a two-dot chain line) is defined as a latitude line (longitude), and a closed curve along the minor radius of the circular ring shape (e.g., meridian line 87m shown by a thick line) is defined as a meridian (meridian). The positioning protrusion 87t is formed so that the circular ring shape partially buried in the bottom portion 87c is exposed. The positioning protrusion 87t determines the position of the shaft portion 82 by receiving the contact surface 82e of the shaft portion 82 to be pressed in the thrust direction S. In particular, since the contact surface 82e of the present disclosure is a flat surface, the positioning protrusion 87t contacts the shaft portion 82 at the latitude line 87l that is closest to the shaft portion 82 among the exposed circular ring shapes. The tubular portion 87a is received in the collar receiving hole 36a of the shaft support portion 36L. The lower end portion of the collar pressing portion 33L presses the tubular portion 87a toward the collar receiving hole 36a, thereby fixing the collar 87 to the collar receiving holes 36a, 36b. The collar receiving portion 82a of the shaft portion 82 is rotatably received within the tubular portion 87a. 7, the flange portion 87b is connected to the end of the cylindrical portion 87a on the side of the interposed member 85, and has a flat ring shape centered on the rotation axis AX. The flange portion 87b is rotatably received in the collar receiving hole 36b of the shaft support portion 36L. By receiving the flange portion 87b in the collar receiving hole 36b, the collar 87 is fixed in the direction along the rotation axis AX. As shown in Fig. 15, the bottom 87c is configured to substantially close the end of the tube portion 87a and has a lid-like shape. The bottom 87c forms a positioning protrusion 87t on the surface facing the shaft portion 82. The bottom 87c forms a hole 87o on the rotation axis AX. The hole 87o receives excess grease when, for example, grease is applied between the collar 87 and the shaft portion 82 to improve sliding properties. This prevents the excess grease from interfering with the positioning and sliding of the shaft portion 82. The bottom portion 87c and the cylindrical portion 87a together form a recess formed in the collar 87. The recess is located in the direction of a load F (see FIG. 10) described below. Specifically, the recess is formed in the direction of the load F from the load point where the load F is applied. With this configuration, unnecessary torque is not generated in the shaft portion 82 (and thus the mirror unit 50) by the load F, and pressure in the thrust direction S and radial direction R can be realized in a manner suitable for the sliding function.

[0030] 7, interposed member 85 is disposed in the center of wire spring 81 in the extending direction, and is pressed toward shaft portion 82 by wire spring 81, applying load F, which is resolved into thrust direction S and radial direction R (see FIG. 10), to shaft portion 82 inside collar 87. Load F acts in a direction inclined with respect to rotation axis AX. The interposition member 85 includes a main body portion 85a, a pressing protrusion 85b, and a spring fitting portion 85c.

[0031] The main body 85a has a flat plate shape extending in two directions, that is, along the rotation axis AX and the extending direction of the wire spring 81. The main body 85a has a rectangular plate shape that is long in the extending direction of the wire spring 81. The spring fitting portion 85c is located on the lower surface (the surface on the wire spring 81 side) of the main body portion 85a. The spring fitting portion 85c has a recess 85d into which the wire spring 81 fits. The recess 85d extends in a direction along the wire spring 81 and has a semicircular shape corresponding to the upper portion of the wire spring 81.

[0032] The pressing protrusion 85b is located on the upper surface of the main body 85a and is a portion that presses the shaft protrusion 82c of the shaft 82. The pressing protrusion 85b is located at the center of the upper surface of the main body 85a in the extension direction of the wire spring 81, and is provided on the side farther from the collar 87 in the direction along the rotation axis AX. The pressing protrusion 85b has a trapezoidal shape when viewed from the extension direction of the wire spring 81. The pressing protrusion 85b has an inclined surface 85e that is located on the collar 87 side of the pressing protrusion 85b. As shown in FIG. 10, the inclined surface 85e is in line contact with the inclined surface 82d of the shaft 82, and is inclined toward the main body 85a as it approaches the collar 87 in the direction along the rotation axis AX. This completes the description of the configuration of the mirror axis mechanism 80L.

[0033] In the mirror shaft mechanism 80L, the elastic force of the wire spring 81 presses the intervening member 85 against the shaft portion 82 in the collar 87. At this time, as shown in FIG. 10, a load F is applied to the shaft portion 82 in a direction perpendicular to the inclined surfaces 82d, 85e due to line contact between the inclined surface 85e of the intervening member 85 and the inclined surface 82d of the shaft portion 82. This load F is resolved into a load in the radial direction R and a load in the thrust direction S. Therefore, the load in the radial direction R applied to the shaft portion 82 acts on the inner circumferential surface of the cylindrical portion 87a, and the load in the thrust direction S applied to the shaft portion 82 acts on the positioning protrusion 87t at the bottom of the cylindrical portion 87a. As a result, the shaft portion 82 is held in the collar 87 by forces in the radial direction R and the thrust direction S. Even when shaft portion 82 rotates around rotation axis AX, the contact position between inclined surface 85e of intervening member 85 and inclined surface 82d of shaft portion 82 changes in the circumferential direction around rotation axis AX, but as described above, shaft portion 82 remains held within collar 87 by forces in radial direction R and thrust direction S.

[0034] 11, like the mirror axis mechanism 80L, the mirror axis mechanism 80R includes a wire spring 81, an axis portion 82, an intervening member 85, and a collar 87, and has a configuration that is the inverse of the mirror axis mechanism 80L in the direction along the rotation axis AX. Here, only the differences from the mirror axis mechanism 80L will be described. In the mirror shaft mechanism 80R, the inclined surface 85e of the intervening member 85 and the inclined surface 82d of the shaft portion 82 do not come into contact with each other, and the upper surface 85f of the pressing protrusion 85b of the intervening member 85 comes into contact with the outer circumferential surface of the shaft main body portion 82b of the shaft portion 82. As a result, in the mirror shaft mechanism 80R, the intervening member 85 applies force to the shaft portion 82 only in the radial direction R due to the elastic force of the wire spring 81. In the above configuration, distortion of the reflecting surface 55a is suppressed by applying a load in the thrust direction S to only one of the pair of shaft portions 82. In addition, by applying a load in the radial direction R to both of the pair of shaft portions 82, rattling of the mirror unit 50 and, ultimately, image blurring of the virtual image V are suppressed.

[0035] (effect) According to the embodiment described above, the following effects are achieved.

[0036] (1-1) The mirror unit 50 includes a mirror main body 55 that reflects display light L, which is an example of light, a shaft portion 82 that extends along a rotation axis AX of the mirror main body 55 and is supported rotatably around the rotation axis AX together with the mirror main body 55, a wire spring 81 that is an example of a pressing portion that presses the shaft portion 82 at least in a thrust direction S of the shaft portion 82 by elastic force while the shaft portion 82 is supported rotatably around the rotation axis AX, and a collar 87 that is an example of a positioning portion that receives the shaft portion 82 pressed in the thrust direction S, thereby determining the position of the shaft portion 82, and the collar 87 is formed in a circular ring shape with an opening facing the thrust direction S, and forms a positioning protrusion 87t that contacts the shaft portion 82 along the latitude line of the circular ring shape. According to this configuration, the positioning protrusion 87t comes into line contact with the shaft 82, so that the mirror body 55 can be accurately positioned in the thrust direction while favorably rotating, thereby favorably suppressing wear. As a result, the mirror unit can reduce wear caused by the rotation of the mirror.

[0037] (1-2) The mirror unit 50 further includes a lower case part 31 formed in a box shape with a bottom that opens upward to accommodate the mirror main body part 55, and an upper case part 32 which forms a window part 32a through which the display light L passes and closes the opening of the lower case part 31, the collar 87 forms a bottom part 87c which forms a positioning protrusion 87t, a tubular part 87a which extends from the bottom part 87c along the thrust direction S, and a flange part 87b which is formed in the opening of the tubular part 87a, the lower case part 31 forms a collar accommodating hole part 36b which accommodates the flange part 87b, and the upper case part 32 presses the collar 87 towards the lower case part 31.

[0038] (1-3) In the mirror unit 50, the contact surface 82e where the shaft portion 82 comes into contact with the annular shape may be in the shape of a cone having an apex within the opening of the annular shape.

[0039] (1-4) In the mirror unit 50, when the point where the wire spring 81, which is an example of a pressing part, presses the shaft part 82 in the radial direction R and the thrust direction S is defined as the load point and the pressing direction is defined as the load direction, the collar 87 is located at the end of the load point in the load direction. In particular, a recess formed by the tube part 87a and the bottom part 87c is located at the end of the load point in the load direction. According to this configuration, unnecessary torque is not generated in the shaft portion 82 (and thus in the mirror unit 50) by the load F, and pressure in the thrust direction S and the radial direction R can be realized in a manner suitable for the sliding function.

[0040] (1-5) The head-up display device 100 includes a mirror unit 50 and a display 20 that emits display light L toward the mirror unit 50, and the mirror unit 50 displays a virtual image by reflecting the display light L from the display 20 toward the windshield 201. According to this configuration, a head-up display device capable of reducing wear caused by rotation of the mirror can be provided.

[0041] (2-1) The mirror unit 50 includes a mirror main body 55 that reflects the display light L, an axle 82 that extends along a rotation axis AX of the mirror main body 55 and is supported rotatably about the rotation axis AX together with the mirror main body 55, and a wire spring 81 that presses the axle 82 in the radial direction R and thrust direction S of the axle 82 by elastic force while the axle 82 is supported rotatably about the rotation axis AX. According to this configuration, the wire spring 81 is used as a means for pressing the shaft portion 82 in the radial direction R and the thrust direction S. The wire spring 81 has a larger elastic force and less variation than a leaf spring, so that the yield rate due to insufficient elastic force can be improved, and thus manufacturing can be facilitated. Furthermore, since the wire spring 81 is simply cut out from a wire rod, bending and punching processes required for leaf springs are not required, and manufacturing is facilitated. Furthermore, the wire spring 81 can withstand a larger external force before it is plastically deformed, compared to a leaf spring. This is because the wire spring 81 can exert an elastic force even when the external force increases due to the tolerance of other members, improving the yield rate and thus facilitating manufacturing. More specifically, for example, in order to generate sufficient load with a leaf spring due to the constraints of material properties, high processing precision is required because the elastic force changes significantly depending on the tolerance during processing, and large load changes occur due to variations in the amount of deflection, making it difficult to allow freedom in design. In this regard, wire spring 81 does not have such problems and improves design freedom. Furthermore, with a leaf spring, in order to make a product work with such limited freedom, it is necessary to precisely assemble the leaf spring to the fixed side that holds the concave mirror, which makes the assembly work complicated. In this regard, wire spring 81 does not require high assembly precision, making the assembly work easier.

[0042] (2-2) The mirror unit 50 includes an intervening member 85 that is formed from resin and is interposed between a metal wire spring 81 and a resin shaft portion 82. With the shaft portion 82 rotatably supported about a rotation axis AX by a collar 87, which is an example of a shaft support portion, the intervening member 85 receives an elastic force from the wire spring 81 and presses the shaft portion 82 toward the collar 87 in the radial direction R and the thrust direction S. According to this configuration, the interposed member 85 suppresses sliding wear between the shaft portion 82 and the wire spring 81. In addition, the generation of abnormal sliding noise between the wire spring 81 and the shaft portion 82 can be suppressed. Furthermore, by providing the interposed member 85, it becomes unnecessary to apply a lubricant or a lubricant plating to the shaft portion 82 or the wire spring 81.

[0043] (2-3) The wire spring 81 is housed in a spring housing portion 35L that is perpendicular to the rotation axis AX and is formed on the bottom surface 31B inside the case 30 that houses the mirror body 55 and the shaft portion 82. The shaft portion 82 has an inclined surface 82d that is an example of a first inclined surface that is inclined with respect to the rotation axis AX. The intervening member 85 has an inclined surface 85e that is an example of a second inclined surface that is inclined with respect to the rotation axis AX and presses the shaft portion 82 in the radial direction R and the thrust direction S toward the collar 87 by coming into contact with the inclined surface 82d. According to this configuration, the elastic force acting only in one direction (radial direction R) of the wire spring 81 is resolved into pressing forces in the radial direction R and the thrust direction S due to contact between the inclined surface 82d of the shaft portion 82 and the inclined surface 85e of the interposed member 85. This makes it possible for a single elastic member (wire spring 81) to generate pressing forces in two directions.

[0044] (2-4) The interposition member 85 has a recess 85d into which the wire spring 81 fits. According to this configuration, the interposed member 85 is more likely to receive the elastic force from the wire spring 81 .

[0045] (2-5) The head-up display device 100 includes a mirror unit 50 and a display 20 that emits display light L toward the mirror unit 50. The mirror unit 50 displays a virtual image V by reflecting the display light L from the display 20 toward a windshield 201, which is an example of a projected member. According to this configuration, the variation in the elastic force of the wire spring 81 is reduced, so that a stable holding force can be applied to the shaft portion 82 of the mirror unit 50. This makes it possible to suppress image blurring of the virtual image V more stably.

[0046] The present disclosure is not limited to the above-described embodiments and drawings. Modifications (including deletion of components) can be made as appropriate within the scope of the present disclosure. An example of a modification will be described below.

[0047] (Modification) In the above embodiment, the intervening member 85 is provided between the wire spring 81 and the shaft portion 82, but the intervening member 85 may be omitted. In this case, the center portion (non-end portion) of the wire spring 81 may directly press the inclined surface 82d of the shaft portion 82. In this case, for example, a coating layer that reduces friction may be formed on at least one of the contact portions between the wire spring 81 and the inclined surface 82d. Also, a recess into which the wire spring 81 fits may be formed on the inclined surface 82d.

[0048] In the above embodiment, the collar 87 may be fixed to the collar receiving holes 36a, 36b with bolts (not shown). In this case, the collar retaining portions 33L, 33R of the upper case portion 32 can be omitted. The collar 87 may be formed integrally with the shaft supporting portions 36L, 36R.

[0049] In the above embodiment, the pair of wire springs 81 were accommodated in the spring accommodating portions 35L, 35R so as to be parallel to each other, but they do not have to be parallel, and may be accommodated in the spring accommodating portions 35L, 35R so as to be in a V-shape with respect to each other.

[0050] In the above embodiment, the spring accommodating portions 35L, 35R were formed as holes in the bottom surface 31B of the lower case portion 31, but instead of holes, they may be formed as support pins that are erected on the bottom surface 31B and support both ends of the wire spring 81.

[0051] In the above embodiment, the wire spring 81 is formed in a straight line, but it is not limited to a straight line and may be formed in a bent state. For example, as shown in Fig. 12 to Fig. 14, the wire spring 181 includes a main body 181a extending in a direction perpendicular to the rotation axis AX, bent portions 181b and 181c extending from both ends of the main body 181a in a direction perpendicular to the main body 181a, and legs 181d and 181e extending from the lower ends of the bent portions 181b and 181c in directions away from each other along the rotation axis AX. The legs 181d and 181e come into contact with the bottom surface of the spring accommodating portion 135, so that the main body 181a is separated from the bottom surface. As shown in FIG. 13, the intervening member 185 has a generally V-shape that is inverted in the vertical direction when viewed from the direction in which the main body 181a of the wire spring 181 extends. The main body 181a fits into an inner corner of the intervening member 185. The outer corner of the intervening member 185 fits into a recess 182a formed in the outer circumferential surface of the shaft portion 182. The recess 182a is formed as a generally V-shaped hole that is inverted in the vertical direction. The recess 182a has an inclined surface 182b with which the intervening member 185 comes into contact. The elastic force of the main body 181a of the wire spring 181 causes the intervening member 185 to press the inclined surface 182b, and the intervening member 185 presses the shaft portion 182 in the thrust direction and radial direction within the collar 87, as in the above embodiment.

[0052] In the above embodiment, one wire spring 81 was provided corresponding to one shaft portion 82, but two wire springs 81 may be provided corresponding to one shaft portion 82, with one of the two wire springs 81 pressing the shaft portion 82 in the radial direction R and the other of the two wire springs 81 pressing the shaft portion 82 in the thrust direction S.

[0053] In the above embodiment, the head-up display device 100 is mounted on a vehicle, but the present invention is not limited to this and may be mounted on a vehicle such as an airplane, a ship, etc. In addition, the projection member is not limited to the windshield 201 and may be a dedicated combiner.

[0054] In the above embodiment, the contact surface 82e of the shaft portion 82 is configured as a flat surface, but this is not limited thereto, and the contact surface may be configured as a conical surface. In this case, it is particularly preferable that the apex of the contact surface is formed within the opening of the positioning protrusion 87t. With this configuration, the shaft portion 82 is positioned at the center of the positioning protrusion 87t simply by being pressed in the thrust direction, thereby improving the positioning accuracy. The contact surface 82e may be in contact with the positioning protrusion 87t by forming a flat surface or a conical surface, or may have a notch formed in a portion of the circumferential direction. In other words, the contact surface may have a notch so that it can achieve line contact with the positioning protrusion at least in a portion, but may not be in contact in other portions. This reduces friction and achieves a suitable sliding motion. [Explanation of symbols]

[0055] 20 Display 30 cases 31 Lower case part 31B Bottom 32 Upper case part 32a Window section 33L, 33R collar holder 35L, 35R, 135 Spring housing 35a, 35b, 35c, 35d First spring support portion 35e, 35f Second spring support part 35h Spring accommodation hole 36L,36R Shaft support part 36a, 36b Collar receiving hole 50 Mirror unit 55 Mirror body 55a Reflective surface 55h Mirror Holder 60 Folding Mirror 70 Mirror drive mechanism 80L, 80R Mirror axis mechanism 81 Wire Spring 82,182 Shaft 82a Collar storage section 82b Shaft body part 82c Shaft protrusion 82d,85e,182b Slope 82e contact surface 85,185 Intervening members 85a, 181a Main body 85b Pressing protrusion 85c Spring fitting 85d,182a Recess 85f top surface 87 Color 87a Cylinder part 87b Tsubabe 87c bottom 87t Positioning protrusion 87l parallel 87m Meridian 87o hole 100 Head-up display device 181 Wire Spring 181b,181c Bend part 181d,181e Legs 201 Windshield F load L display light R radial direction S Thrust direction V Virtual Image AX Rotation Axis

Claims

1. A mirror body that reflects light; a shaft portion extending along a rotation axis of the mirror main body and supported rotatably around the rotation axis together with the mirror main body; a pressing portion that presses the shaft portion at least in a thrust direction of the shaft portion by an elastic force in a state in which the shaft portion is rotatably supported around the rotation axis; a positioning portion that receives the shaft portion in the thrust direction, the positioning portion has an annular shape with an opening facing the thrust direction, and a positioning protrusion that contacts the shaft portion is formed along a latitude line of the annular shape. Mirror unit.

2. a lower case formed in a box shape with a bottom for accommodating the mirror main body; a lid-shaped upper case that forms a window portion through which the light passes and closes the lower case, The positioning portion is A bottom portion forming the positioning protrusion; a cylindrical portion extending from the bottom portion along the thrust direction; A flange portion is formed at an end of the cylindrical portion, the lower case has a hole for receiving the flange, The upper case presses the positioning portion toward the lower case.

2. The mirror unit according to claim 1.

3. A contact surface of the shaft portion in contact with the annular shape forms a cone shape having an apex within the opening of the annular shape.

2. The mirror unit according to claim 1.

4. When a point where the pressing portion presses the shaft portion in the radial direction and the thrust direction is defined as a load point and a pressing direction is defined as a load direction, the positioning portion is located at a point in the load direction from the load point.

2. The mirror unit according to claim 1.

5. A mirror unit according to any one of claims 1 to 4, a display that emits the light toward the mirror unit; the mirror unit displays a virtual image by reflecting the display light from the display device toward a projection member; Head-up display device.

Images