Mirror unit

Abstract

To provide a mirror unit that enables common use of an elastic member for holding mirrors of different types.SOLUTION: A mirror unit that reflects display light from a display so as to guide the display light to a windshield includes a first mirror 11 that reflects the display light, a second mirror 12 that reflects the display light from the first mirror 11, receiving portions 34L and 34R that hold the first mirror 11 in a non-rotatable manner, a receiving portion 70R that rotatably holds the second mirror 12 about a rotation axis Ax, plate springs 40L and 40R that press the first mirror 11 against the receiving portions 34L and 34R, and a plate spring 50 that presses the second mirror 12 against the receiving portion 70R, wherein the plate springs 40L and 40R and the plate spring 50 are formed in a common shape.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a mirror unit. [Background technology]

[0002] In the head-up display device described in Patent Document 1, the supported portion of the concave mirror is rotatably supported on a support, and the supported portion is pressed against the support by a leaf spring. The head-up display device described in Patent Document 2 is provided with a fixed mirror that reflects display light from a display toward a rotating mirror, and the axis and positioning portion of this fixed mirror are pressed toward a mirror support portion by a leaf spring. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6836718 [Patent Document 2] International Publication No. 2021 / 157633 Summary of the Invention [Problem to be solved by the invention]

[0004] The leaf springs described in Patent Document 1 and Patent Document 2 have different shapes, so when using leaf springs to hold the rotating mirror and the fixed mirror, it was necessary to prepare leaf springs with different shapes.

[0005] The present disclosure has been made in consideration of the above-described circumstances, and aims to provide a mirror unit that can use a common elastic member to hold different types of mirrors. [Means for solving the problem]

[0006] In order to achieve the above object, the mirror unit according to the present disclosure comprises: A mirror unit that reflects display light from a display device so as to guide it to a projection member, a first mirror that reflects the display light; a second mirror that reflects the display light from the first mirror; a first mirror holding portion that holds the first mirror so that it cannot rotate; a second mirror holding portion that holds the second mirror rotatably around a rotation axis; a first elastic member that presses the first mirror against the first mirror holding portion; a second elastic member that presses the second mirror against the second mirror holding portion, The first elastic member and the second elastic member are formed in a common shape. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to standardize the elastic members that hold different types of mirrors. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic cross-sectional view of a head-up display device according to an embodiment of the present disclosure. [Figure 2] 1 is a perspective view of a head-up display device according to an embodiment of the present disclosure with an upper case portion removed; [Figure 3] 1 is a perspective view of a portion of a head-up display device with an upper case portion removed according to an embodiment of the present disclosure. FIG. [Figure 4] FIG. 2 is an exploded perspective view of a second mirror and a receiving portion according to an embodiment of the present disclosure. [Figure 5] 1 is a perspective view of a portion of a head-up display device with an upper case portion removed according to an embodiment of the present disclosure. FIG. [Figure 6] 1 is a front view of a head-up display device according to an embodiment of the present disclosure with an upper case portion removed; [Figure 7] FIG. 2 is a perspective view of a first mirror, a leaf spring, and an inner case portion according to an embodiment of the present disclosure. [Figure 8] FIG. 2 is a bottom view of a first mirror, a leaf spring, and an inner case according to an embodiment of the present disclosure. [Figure 9] FIG. 2 is a side view of a first mirror, a leaf spring, and an inner case portion according to an embodiment of the present disclosure. [Figure 10] FIG. 2 is a perspective view of a first mirror, a leaf spring, and an inner case portion according to an embodiment of the present disclosure. [Figure 11] FIG. 1 is a perspective view of a leaf spring according to an embodiment of the present disclosure. [Figure 12] FIG. 2 is a perspective view of a second mirror, a leaf spring, and a receiving portion according to an embodiment of the present disclosure. [Figure 13] FIG. 1 is a front view of a leaf spring and a receiving portion according to an embodiment of the present disclosure. [Figure 14] 13 is a cross-sectional view taken along line XIII-XIII in FIG. 12. DETAILED DESCRIPTION OF THE INVENTION

[0009] A head-up display device having a mirror unit according to an embodiment of the present disclosure will be described with reference to the drawings. 1, a head-up display device 10 is mounted on a vehicle and displays a projection image as a virtual image including vehicle information by projecting display light L onto a windshield 19, which is an example of a projection target member. In the following description, the height direction of the vehicle is defined as the Z direction, the width direction of the vehicle is defined as the X direction, and the front-to-rear direction of the vehicle is defined as the Y direction.

[0010] As shown in FIG. 1, the head-up display device 10 includes a first mirror 11 which is an example of a fixed mirror, a second mirror 12 which is an example of a rotating mirror, a case 30, a light source 13, a display 14, a control board 15, a mirror rotation drive unit 18, and, as shown in FIGS. 2 and 6, leaf springs 40L, 40R, 40W, and 50 which hold each mirror 11 and 12.

[0011] 1, the light source 13 emits illumination light toward the display 14 under the control of the control board 15. The light source 13 includes, for example, a plurality of LEDs (Light Emitting Diodes). The display 14 receives illumination light from the light source 13 and emits display light L that displays an image. The display 14 is, for example, a TFT (Thin Film Transistor) type liquid crystal display panel.

[0012] The control board 15 controls the light source 13, the display 14, and the mirror rotation drive unit 18. The control board 15 includes a CPU (Central Processing Unit), a GDC (Graphic Display Controller), a ROM (Read Only Memory), a RAM (Random Access Memory), etc. The control board 15 receives vehicle information from an external source, and causes the light source 13 to emit illumination light toward the display 14 while displaying an image including the vehicle information on the display 14.

[0013] 1, the first mirror 11 is a correction mirror that reflects display light L from the display 14 toward the second mirror 12. The first mirror 11 is, for example, a concave mirror. The first mirror 11 is long in the X direction and short in the Z direction, and has a plate shape that is curved concavely in the Z direction. The first mirror 11 is held to an inner case portion 33 (described later) of the case 30 at three points on the outer periphery of the first mirror 11 by three leaf springs 40L, 40R, and 40W (see FIG. 6). The first mirror 11 may be a plane mirror.

[0014] 2, the first mirror 11 includes a first mirror body 11a and a first mirror holder 11b. The first mirror body 11a is in the form of a concave plate having a reflecting surface. The first mirror holder 11b is made of resin and holds the first mirror body 11a from its rear side (the side behind the reflecting surface).

[0015] 5 to 7, the first mirror holder 11b includes a first holder main body portion 11c and three pressed portions 11L, 11R, and 11W. The first mirror main body portion 11a is formed on the front surface (the surface facing the second mirror 12) of the first holder main body portion 11c. The two pressed portions 11L, 11R are located on both sides of the first holder main body portion 11c in the X direction. Each pressed portion 11L, 11R is located at the top of each side surface of the first holder main body portion 11c extending in the Z direction. Each pressed portion 11L, 11R has a generally cylindrical shape extending in the X direction.

[0016] As shown in Figures 7 and 8, the pressed portion 11W is located on the lower side surface of the first holder main body portion 11c. The pressed portion 11W is located approximately in the center of the lower side surface of the first holder main body portion 11c in the X direction, more specifically, closer to the pressed portion 11R than the center of the lower side surface in the X direction. The pressed portion 11W has a shape that extends in a direction along the first holder main body portion 11c. The pressed portion 11W has a dome-shaped contact portion 11V that bulges out toward the back side of the first mirror 11. The contact portion 11V is the portion that comes into contact with the leaf spring 40W.

[0017] As shown in FIG. 1 , the second mirror 12 is supported within the case 30 so as to be rotatable about a rotation axis Ax extending in the X direction. The second mirror 12 reflects the display light L from the first mirror 11 toward the windshield 19. The second mirror 12 is, for example, a concave mirror. The second mirror 12 is long in the X direction, short in the Z direction, and has a plate shape that is concavely curved in the Z direction. The second mirror 12 is larger in size in the X direction and Z direction than the first mirror 11. The windshield 19 reflects the display light L from the second mirror 12 toward a viewer, for example, a driver. As a result, a virtual image including vehicle information is displayed on the windshield 19 so as to be visible to the viewer. As shown in FIG. 2, one end of the second mirror 12 on the rotation axis Ax (the left end in FIG. 2) is supported by a receiving portion 70R of the case 30, which will be described later, so as to be rotatable around the rotation axis Ax, and the other end of the second mirror 12 on the rotation axis Ax (the right end in FIG. 2) is held by a leaf spring 50 on a receiving portion 70L of the case 30, which will be described later.

[0018] 3, the second mirror 12 includes a second mirror body 12a and a second mirror holder 12b. The second mirror body 12a is a concave, curved plate with a reflective surface. The second mirror holder 12b is made of resin and holds the second mirror body 12a from its back side.

[0019] 2 to 4, the second mirror holder 12b includes a second holder main body portion 12c, a shaft portion 12L, and a pressed portion 12R. The second holder main body portion 12c is formed so as to cover the back surface of the second mirror main body portion 12a. The shaft portion 12L and the pressed portion 12R are located on both sides of the second holder main body portion 12c in the X direction. The shaft portion 12L and the pressed portion 12R are located approximately at the center in the Z direction of each side surface of the second holder main body portion 12c extending in the Z direction. The shaft portion 12L and the pressed portion 12R are located on the rotation axis Ax.

[0020] 12 and 14, the pressed portion 12R has a generally cylindrical shape extending in the X direction. The rotation axis Ax passes through the center of the pressed portion 12R. As shown in Fig. 4, the shaft portion 12L includes a hemispherical portion 12M and a cylindrical portion 12N. The flat portion of the hemispherical portion 12M is located on the side surface of the second holder main body portion 12c. The cylindrical portion 12N extends in the X direction from the apex of the hemispherical portion 12M. The rotation axis Ax passes through the center of the cylindrical portion 12N.

[0021] 1, the mirror rotation drive unit 18 rotates the second mirror 12 about the rotation axis Ax under the control of the control board 15. When the second mirror 12 rotates about the rotation axis Ax, the irradiation position of the display light L with respect to the viewer can be adjusted in the Z direction.

[0022] As shown in Fig. 1, the case 30 includes a lower case portion 35, an upper case portion 36, a lower cover portion 37, and a middle case portion 33, and as shown in Fig. 2, receiving portions 70L and 70R. Each portion of the case 30 is formed from a light-blocking resin or metal.

[0023] The lower case portion 35 is box-shaped and opens upward, and accommodates the middle case portion 33, receiving portions 70L and 70R, first mirror 11, second mirror 12, and mirror rotation drive portion 18. The light source 13, display 14, and control board 15 are installed on the outer bottom surface of the lower case portion 35. The lower cover portion 37 is attached to the outer bottom surface side of the lower case portion 35 so as to cover the light source 13 and the display 14 .

[0024] The upper case part 36 is attached to the top of the lower case part 35 so as to close the opening of the lower case part 35. The upper case part 36 is formed in a frame shape having an opening part 36a through which the display light L passes from the second mirror 12 toward the windshield 19. The opening part 36a of the upper case part 36 is closed by a light-transmitting plate part 36b through which light including the display light L passes.

[0025] As shown in Figures 1 to 3, the middle case portion 33 is formed to isolate the optical path space of the display light L within the housing consisting of the lower case portion 35 and the upper case portion 36 from the space in which the receiving portions 70L, 70R and the mirror rotation drive portion 18 are arranged. The middle case portion 33 includes a first mirror installation frame portion 33a, a bottom wall portion 33b, a pair of side wall portions 33c, and receiving portions 34L, 34R, and 34W (see FIG. 6). The first mirror installation frame 33a is in the form of a frame that covers the outer periphery of the reflecting surface of the first mirror 11, and supports the first mirror 11 in contact with the outer periphery of the reflecting surface of the first mirror 11. The bottom wall 33b and the side wall 33c form an optical path space for the display light L traveling from the first mirror 11 to the second mirror 12. The bottom wall 33b is aligned with the inner bottom wall of the lower case 35. Each side wall 33c extends upward from both ends of the bottom wall 33b in a direction perpendicular to the traveling direction of the display light L. The receivers 70L, 70R and the mirror rotation drive unit 18 are located outside the optical path space separated by each side wall 33c within the lower case 35.

[0026] 5, the receiving portions 34L, 34R are located on both sides of the first mirror installation frame portion 33a in the X direction, and are formed to support the pressed portions 11L, 11R. Since the receiving portions 34L, 34R have the same shape, the following description will focus on the receiving portion 34R, and a description of the receiving portion 34L will be omitted. As shown in FIGS. 7 and 9, the receiving portion 34R includes a recess 34a, a screw fastening portion 34b, and a retaining portion 34c. The recess 34a is recessed and opens toward the rear surface of the first mirror 11, and the outer periphery of the cylindrical pressed portion 11R fits into the recess 34a. The recess 34a has a bottom surface 34a3 and two side walls 34a1 and 34a2 standing on both ends of the bottom surface 34a3 in the Z direction. The side wall 34a1 is approximately perpendicular to the bottom surface 34a3. The side wall 34a2 is inclined at an obtuse angle to the bottom surface 34a3. The side wall 34a2 is located above the side wall 34a1. The pressed portion 11R is sandwiched between the side walls 34a1 and 34a2, with a gap between the pressed portion 11R and the bottom surface 34a3.

[0027] The screw fastening portion 34b and the retaining portion 34c are arranged on both sides of the recess 34a in the Z direction. The screw fastening portion 34b is located above the retaining portion 34c. The screw fastening portion 34b is a portion to which the leaf spring 40R is fastened with a screw. A screw hole 34b1 into which the threaded shank of the screw B is screwed is formed on the end surface of the screw fastening portion 34b on the XZ plane facing the back surface side of the first mirror 11.

[0028] With the retaining end 44 of the leaf spring 40R locked, the retaining portion 34c holds the leaf spring 40R in a locked state in the longitudinal direction. The retaining portion 34c is located closer to the opening of the recess 34a than the recess 34a and below the recess 34a. The retaining ends 44, 54 of the leaf spring 40R are located farther from the screw-fastening portion 34b than the retaining portion 34c, thereby preventing the leaf spring 40R from being locked.

[0029] As shown in FIGS. 7 and 8, the receiving portion 34W is located below the first mirror installation frame portion 33a and approximately in the center in the X direction, and is formed so as to support the pressed portion 11W. The receiving portion 34W includes a recess 34d, a screw fastening portion 34e, and a retaining portion 34f. The recess 34d has two inclined surfaces 34d1 and 34d2 that intersect at an obtuse angle in a V-shape. The screw fastening portion 34e and the retaining portion 34f are disposed on both sides of the recess 34d in the X direction. The structure and function of the screw fastening portion 34e and the retaining portion 34f are similar to those of the screw fastening portion 34b and the retaining portion 34c described above, and therefore a description thereof will be omitted.

[0030] As shown in FIG. 2, the receiving portions 70L and 70R are disposed on both sides of the second mirror 12 in the X direction (longitudinal direction) inside the lower case portion . As shown in Fig. 4, the receiving portion 70L supports the shaft portion 12L so that it can slide and rotate about the rotation axis Ax. The receiving portion 70L has an annular portion 70M that surrounds the outer periphery of the shaft portion 12L so that the shaft portion 12L can rotate about its axis. The inner circumferential surface of the annular portion 70M is shaped according to the outer circumferential surfaces of the hemispherical portion 12M and the cylindrical portion 12N. The annular portion 70M functions as a sliding bearing for the shaft portion 12L.

[0031] As shown in FIGS. 12 and 14, the receiving portion 70R includes a recess 70a, a screw fastening portion 70b, a retaining portion 70c, and an upper bridge portion 70d. The recess 70a is a recessed portion that opens upward and fits over the cylindrical pressed portion 12R. The recess 70a has a bottom surface 70a3 and two side walls 70a1 and 70a2 that extend in a direction intersecting both ends of the bottom surface 70a3 in the Y direction. The two side walls 70a1 and 70a2 are inclined with respect to the bottom surface 70a3 so as to move away from each other toward the opening of the recess 70a. The outer peripheral surface of the pressed portion 12R is sandwiched between the two side walls 70a1 and 70a1, and at this time, the pressed portion 12R is spaced away from the bottom surface 70a3.

[0032] The screw fastening portion 70b and the retaining portion 70c are arranged on both sides of the recess 70a in the Y direction. The screw fastening portion 70b is located closer to the first mirror 11 than the retaining portion 70c. The screw fastening portion 70b is a portion to which the leaf spring 50 is fastened with a screw. A screw hole 70b1 into which the threaded shank of a screw B (see FIG. 14) is screwed is formed on the upper end surface of the screw fastening portion 70b.

[0033] The retaining portion 70c has the same structure and function as the retaining portion 34c described above. The differences between the retaining portions 34c and 70c will be described below. The width W1 in the X direction of the screw fastening portion 70b (see FIG. 13) is smaller than the width W2 in the X direction of the screw fastening portion 34b (see FIG. 10) or the width W3 in the Z direction of the screw fastening portion 34e (see FIG. 7). The widths of the screw fastening portions 34b, 34e, 70b are shaped to become smaller toward the end faces where the screw holes 34b1, 70b1 of the screw fastening portions 34b, 70b are formed. The widths W1, W2, W3 are the widths of the screw fastening portions 34b, 34e, 70b at the portions facing the claw portions 43a, 53a (described later) of the leaf springs 40L, 40R, 40W, 50. The width W1 is smaller than the distance between a pair of claw portions 43a, 53a (described later), and the widths W2, W3 are larger than the distance between a pair of claw portions 43a, 53a (described later). As a result, a temporary fixing portion 53 of the leaf spring 50, which will be described later, is not temporarily fixed to the screw fixing portion 70b, but is temporarily fixed to the screw fixing portions 34b and 34e. This point will be described in detail later.

[0034] The upper bridge portion 70d is formed so as to close the opening of the recessed portion 70a when viewed from the X direction. The upper bridge portion 70d has a plate shape extending in a direction perpendicular to the rotation axis Ax, and is located closer to the second mirror main body portion 12a than the recessed portion 70a.

[0035] The leaf springs 40L, 40R, 40W, and 50 are provided to hold the pressed portions 11L, 11R, 11W, and 12R to the case 30 by pressing them toward the case 30 with their elastic force, respectively. 11, the leaf springs 40L, 40R, 40W, and 50 are integrally formed from a metal material. The leaf springs 40L, 40R, 40W, and 50 are leaf springs. The leaf springs 40L, 40R, 40W each include a main body portion 41, a handle portion 42, a plurality of temporary fixing portions 43, a retaining end portion 44, and a plurality of inclined side portions 45.

[0036] The main body 41 is formed in the shape of a rectangular plate. The handle portion 42 is located at a first longitudinal end of the main body portion 41 and is a portion to be held by the operator's hand. The handle portion 42 is formed in a rectangular plate shape on the same plane as the main body portion 41. The handle portion 42 is located at the center of the main body portion 41 in the short direction at the first end of the main body portion 41. The handle portion 42 is formed with a width smaller than the width of the main body portion 41 and a length shorter than the length of the main body portion 41 in the longitudinal direction.

[0037] The retaining end 44 is located at the second end of the main body 41 and is folded back in a direction perpendicular to the main body 41. The width of the retaining end 44 is the same as the width of the main body 41. The retaining end 44 is hooked onto the retaining portion 34c (see FIG. 9), thereby preventing the leaf springs 40L, 40R from coming off in the longitudinal direction.

[0038] The two temporary fixing portions 43 are located at the ends of both longitudinally extending side surfaces of the main body 41, closer to the handle portion 42. The two temporary fixing portions 43 are arranged facing each other in the short direction of the main body 41 and are rectangular plates extending perpendicular to the main body 41 and away from the retaining end portion 44. The two temporary fixing portions 43 are formed to clamp the screw fixing portions 34b, 34e when temporarily fixing the leaf springs 40L, 40R, 40W to the screw fixing portions 34b, 34e. Here, "temporarily fixed" refers to a state in which the leaf springs 40L, 40R, 40W are fixed with sufficient force to allow the leaf springs 40L, 40R, 40W to be detached by hand. Each of the two temporary fixing portions 43 includes a claw portion 43a located at its tip. The claw portions 43a are bent inward toward the tip of the temporary fixing portion 43 so that the distance between them decreases. The claw portions 43a engage with the outer surfaces of the screw fixing portions 34b, 34e.

[0039] A screw passing hole 41a through which the head of a screw B (see FIG. 9) passes is formed in the main body 41. The screw passing hole 41a penetrates the main body 41 in the thickness direction and is located at a first end portion in the longitudinal direction of the main body 41. The screw passing hole 41a is provided at a position farther from the handle portion 42 than the temporary fixing portion 43 is in the longitudinal direction of the leaf springs 40L, 40R, 40W.

[0040] The two inclined side portions 45 are located on both side surfaces extending in the longitudinal direction of the main body portion 41 and are formed so as to be inclined relative to the main body portion 41. Each inclined side portion 45 is bent relative to the main body portion 41 in the same direction as the retaining end portion 44. Each inclined side portion 45 is located slightly closer to the retaining end portion 44 than the center of the main body portion 41 in the longitudinal direction. When viewed in the thickness direction of the main body portion 41, the inclined side portion 45 has a trapezoidal shape whose base is connected to the side surface of the main body portion 41. The inclined side portions 45 are arranged so as to be located directly above the pressed portions 11L, 11R, and 11W.

[0041] As shown in Figures 12 to 14, the leaf spring 50 has the same configuration as the leaf springs 40L, 40R, and 40W, and includes a main body portion 51 in which a screw passage hole 51a is formed, a handle portion 52, two temporary fixing portions 53 having claw portions 53a, a retaining end portion 54, and two inclined side portions 55. 13, the claws 53a of each temporary fixing portion 53 are spaced apart from the outer surface of the screw fastening portion 70b with a gap Sp therebetween, so that the leaf spring 50 is not temporarily fastened to the screw fastening portion 70b.

[0042] Next, a method for assembling the first mirror 11 into the case 30 will be described. As shown in Figure 5, the pressed portions 11L and 11R of the first mirror 11 are inserted into the receiving portions 34L and 34R of the middle case portion 33, and as shown in Figure 7, the pressed portion 11W of the first mirror 11 is inserted into the receiving portion 34W of the middle case portion 33. Next, the retaining ends 44, 54 of the leaf springs 40L, 40R are inserted so as to be retained by the retaining portions 34c, and the temporary fixing portions 43 are temporarily fixed to the screw fixing portions 34b so that the screw fixing portions 34b of the receiving portions 34L, 34R are sandwiched between the pair of temporary fixing portions 43. As a result, as shown in Fig. 9, the screw passing holes 41a of the leaf springs 40L, 40R are aligned with the screw holes 34b1 of the screw fixing portions 34b, and the main bodies 41 of the leaf springs 40L, 40R press the outer circumferential surfaces of the pressed portions 11L, 11R. Similarly, while inserting the retaining end 44 of the leaf spring 40W so that it is retained by the retaining portion 34f, the temporary fixing portion 43 of the leaf spring 40W is temporarily fixed to the screw fixing portion 34e. As a result, with the screw passing hole 41a of the leaf spring 40W aligned with the screw hole of the screw fixing portion 34e, the main body 41 of the leaf spring 40W presses the contact portion 11V of the pressed portion 11W, as shown in FIG. As described above, by temporarily fixing each of the leaf springs 40L, 40R, and 40W to the screw fastening portions 34b and 34e, the leaf springs 40L, 40R, and 40W are prevented from being pushed up by the pressed portions 11L, 11R, and 11W. In particular, the diameters of the pressed portions 11L, 11R, and 11W of the first mirror 11 are larger than the diameter of the pressed portion 12R of the second mirror 12. For this reason, from the perspective of improving workability, it is necessary to temporarily fix the leaf springs 40L, 40R, and 40W to prevent them from being pushed up. Then, the shank of the screw B is passed through the screw passage hole 41a and screwed into the screw hole 34b1, thereby fixing the leaf springs 40L, 40R, and 40W to the screw fixing portions 34b and 34e. This fixing with screws provides stronger fixation than temporary fixation. The unit in which the first mirror 11 is fixed to the middle case portion 33 is installed in the lower case portion 35. This completes the description of the method for assembling the first mirror 11.

[0043] Next, a method for assembling the second mirror 12 into the case 30 will be described with reference to FIGS. First, the screw fastening portion 70b is installed inside the lower case portion 35. Next, the leaf spring 50 is fixed to the screw fastening portion 70b before the second mirror 12. Specifically, the retaining end 54 of the leaf spring 50 is passed through the through hole 70h of the retaining portion 70c to prevent it from coming off, and the screw passing hole 51a is aligned with the screw hole 70b1. At this time, the temporary fixing portion 53 of the leaf spring 50 is not temporarily fixed to the screw fastening portion 70b of the receiving portion 70R. Then, the shank of the screw B is screwed into the screw hole 70b1 to fix the leaf spring 50 to the screw fastening portion 70b.

[0044] Next, with the receiving portion 70L attached to the shaft portion 12L of the second mirror 12, the pressed portion 12R of the second mirror 12 is inserted into the gap between the leaf spring 50 and the recess 70a of the receiving portion 70R. At this time, the inclined side portion 45 guides the pressed portion 12R, causing the pressed portion 12R to smoothly enter the receiving portion 70R. As a result, the pressed portion 12R of the second mirror 12 is rotatably held by the receiving portion 70R and the leaf spring 50. Thereafter, the shaft portion 12L of the second mirror 12 is housed in the lower case portion 35 together with the receiving portion 70L. This completes the description of the method for assembling the second mirror 12.

[0045] In the method of assembling the second mirror 12, the leaf spring 50 is screwed before the second mirror 12, so there is no need to temporarily fix the leaf spring 50, and when the leaf spring 50 is screwed to the screw fixing portion 70b, the temporary fixing portion 53 does not slide against the side surface of the screw fixing portion 70b. Therefore, the screw fixing can be performed smoothly.

[0046] The second mirror 12 may be assembled in the same manner as the first mirror 11, by first inserting the pressure-receiving portion 12R of the second mirror 12 into the recess 70a of the receiving portion 70R, and then fastening the leaf spring 50 with screws. Incidentally, when assembling the first mirror 11, if the leaf springs 40L, 40R, and 40W are first fastened with screws, the pressed portions 11L, 11R, and 11W cannot be inserted into the respective receiving portions 34L, 34R, and 34W later, because there are multiple pressed portions 11L, 11R, and 11W.

[0047] (effect) According to the embodiment described above, the following effects are achieved. (1) The mirror unit reflects display light L from a display 14 so as to guide it to a windshield 19, which is an example of a projected member, and includes a first mirror 11 that reflects the display light L, a second mirror 12 that reflects the display light L from the first mirror 11, receivers 34L, 34R, and 34W that are an example of a first mirror holder that holds the first mirror 11 so that it cannot rotate, a receiver 70R that is an example of a second mirror holder that holds the second mirror 12 so that it can rotate about a rotation axis Ax, leaf springs 40L, 40R, and 40W that are an example of a first elastic member that presses the first mirror 11 against the receivers 34L, 34R, and 34W, and a leaf spring 50 that is an example of a second elastic member that presses the second mirror 12 against the receiver 70R. The leaf springs 40L, 40R, and 40W and the leaf spring 50 are formed to have a common shape. This configuration allows the leaf springs 40L, 40R, 40W, which are elastic members that hold the first mirror 11 and the second mirror 12, and the leaf spring 50 to have a common shape. Therefore, there is no need to use many different types of leaf springs.

[0048] (2) Leaf springs 40L, 40R, 40W and leaf spring 50 have temporary fixing portions 43, which are an example of contact portions, formed in a common shape. Temporary fixing portions 43 of leaf springs 40L, 40R, 40W are in either a contact state or a non-contact state with receiving portions 34L, 34R, 34W, which in this example is a temporary fixable state, which is an example of a contact state, and temporary fixing portion 43 of leaf spring 50 is in the other of a contact state or a non-contact state with receiving portion 70R, which in this example is a temporary fixable state, which is an example of a non-contact state. According to this configuration, the leaf springs 40L, 40R, 40W and the leaf spring 50 have a common shape, but can be made to differ in whether or not they perform some of their functions.

[0049] (3) The leaf springs 40L, 40R, 40W have, as contact portions, temporary fixing portions 43 (hook portions) that can be temporarily fixed to the screw fixing portions 34b, 34e that are part of the receiving portions 34L, 34R, 34W and the receiving portion 70R. According to this configuration, the leaf springs 40L, 40R, 40W and the leaf spring 50 have a common shape, but can be made to differ in whether or not they perform a temporary fixing function.

[0050] (4) Leaf springs 40L, 40R, 40W and leaf spring 50 include main body portions 41, 51 formed in a flat plate shape and retaining ends 44, 54 located at one longitudinal end (left end in FIG. 11 ) of main body portions 41, 51 and retained in the corresponding receiving portions 34L, 34R, 34W or receiving portion 70R, respectively. Main body portions 41, 51 are formed with screw passage holes 41a, 51a, which are an example of a hole through which screw B can pass, at the other longitudinal end (right end in FIG. 11 ) of main body portions 41, 51. Screw B secures leaf springs 40L, 40R, 40W and leaf spring 50 to the corresponding receiving portions 34L, 34R, 34W and receiving portion 70R, respectively, more firmly than the temporary fixation described above. This configuration allows the leaf springs 40L, 40R, 40W, and 50 to be reliably fixed to the receiving portions 34L, 34R, 34W, and 70R. Furthermore, when the leaf spring 50 is screwed to the receiving portion 70R, the temporary fixing portion 43 does not come into contact with the receiving portion 70R, allowing for smooth screw fastening.

[0051] (5) The temporary fixing portions 43, 53 are located closer to the other end (the right end in FIG. 11) than the screw passing holes 41a, 51a. With this configuration, when temporarily fixed, the leaf springs 40L, 40R, and 40W can easily apply tension to a part of the first mirror 11 (pressed portions 11L, 11R, and 11W), thereby preventing the leaf springs 40L, 40R, and 40W from being pushed up by the pressed portions 11L, 11R, and 11W.

[0052] (6) The receiving portions 34L, 34R, and 34W are formed in the middle case portion 33. The receiving portion 70R is formed separately from the middle case portion 33, the lower case portion 35, and the upper case portion 36, and is composed of a bearing stay that receives the pressed portion 12R serving as the rotation axis portion of the second mirror 12.

[0053] (7) Each of the leaf springs 40L, 40R, 40W, 50 has two temporary fixing portions 43, 53. With this configuration, the insertion resistance when temporarily fixing temporary fixing portion 43 can be reduced compared to a configuration in which one leaf spring has three temporary fixing portions, making it easier to assemble leaf springs 40L, 40R, and 40W.

[0054] (8) The leaf springs 40L, 40R, 40W, and 50 include handle portions 42 and 52. This configuration makes it easy to handle the leaf springs 40L, 40R, 40W, and 50.

[0055] The present disclosure is not limited to the above-described embodiments and drawings. Modifications (including deletion of components) may be made as appropriate within the scope of the present disclosure. An example of such a modification is described below.

[0056] (Variation) In the above embodiment, the first mirror 11 is held in the middle case portion 33, and the second mirror 12 is held in the lower case portion 35 via the receiving portions 70L and 70R, but the first mirror 11 and the second mirror 12 may be held in a common lower case portion or middle case portion. Furthermore, although the receiving portions 70L, 70R are formed separately from the lower case portion 35, at least one of the receiving portions 70L, 70R may be formed integrally with the lower case portion 35. Furthermore, the receiving portions 34L, 34R, and 34W that receive the pressed portions 11L, 11R, and 11W of the first mirror 11 may be formed as separate members from the middle case portion 33.

[0057] In the above embodiment, the projection target member is the windshield 19, but it may be a dedicated combiner. The head-up display device 10 is not limited to being mounted on a vehicle, but may also be mounted on other vehicles such as an airplane, a ship, etc.

[0058] In the above embodiment, the display 14 is, for example, a TFT-type liquid crystal display panel, but is not limited to this and may be configured to include an organic EL display, a MEMS (Micro Electro Mechanical System), or a DMD (Digital Micro-mirror Device).

[0059] Although only the pressed portion 12R of the first mirror 11 is held by the leaf spring 50, the pressed portions on both sides of the rotation axis Ax of the first mirror 11 may be rotatably held by the leaf spring 50. Furthermore, the leaf springs 40L, 40R, 40W, and 50 are integrally formed by pressing a metal plate, but each part may be formed separately. In the above embodiment, elastic members other than the leaf springs 40L, 40R, 40W, and 50 may be used. Any one or two of the three pressed portions 11L, 11R, and 11W of the first mirror 11 may be omitted. In this case, any one or two of the three leaf springs 40L, 40R, and 40W can be omitted. In the above embodiment, the handle portions 42, 52 of the leaf springs 40L, 40R, 40W, 50 can be omitted. The number of temporary fixing portions 43, 53 of the leaf springs 40L, 40R, 40W, 50 is not limited to two and may be three or more. Furthermore, the temporary fixing portions may be formed in a cylindrical shape into which the screw fixing portions 34b, 34e, 70b fit. The temporary fixing portions may be temporarily fixed to temporary fixing objects other than the screw fixing portions 34b, 34e, 70b. The temporary fixing portions may be located at positions in the longitudinal direction of the leaf spring that are different from those in the above embodiment. Furthermore, multiple sets of temporary fixing portions may be provided in the longitudinal direction of the leaf spring. In the above embodiment, the inclined sides 45, 55 of the leaf springs 40L, 40R, 40W, 50 can be omitted. In the above embodiment, it is possible to omit the retaining ends 44, 54 of the leaf springs 40L, 40R, 40W, 50. Furthermore, both ends of the leaf springs 40L, 40R, 40W, 50 in the longitudinal direction may be fastened with screws. In the above embodiment, the leaf springs 40L, 40R, and 40W are in a contact state where they are temporarily fixed to the screw fastening portions 34b and 34e, and the leaf spring 50 is in a non-contact state where it is not temporarily fixed to the temporary fixing portion 53. However, conversely, the leaf springs 40L, 40R, and 40W may be in a non-contact state where they are not temporarily fixed to the screw fastening portions 34b and 34e, and the leaf spring 50 may be in a contact state where it is temporarily fixed to the temporary fixing portion 53. In the above-described embodiment, the temporary fixing portions 43, 53 may have a function other than temporary fixing, and may be, for example, a functional portion having a function of pressing another member. In the above embodiment, the leaf springs 40L, 40R, 40W, 50 press the pressed portions 11L, 11R, 11W, 12R, but this is not limiting and they may press any position on the holder main body portions 11c, 12c. [Explanation of symbols]

[0060] 10...Head-up display device, 11...first mirror, 11L, 11R, 11W...pressed portion, 11V...contact portion, 11a...first mirror main body portion, 11b...first mirror holder, 11c...first holder main body portion 12... second mirror, 12R... pressed portion, 12L... shaft portion, 12M... hemispherical portion, 12N... cylindrical portion, 12a... second mirror main body portion, 12b... second mirror holder, 12c... second holder main body portion 13...light source, 14...display, 15...control board, 18...mirror rotation drive unit 19...Windshield 30…cases 33...middle case portion, 33a...first mirror installation frame portion, 33b...bottom wall portion, 33c...side wall portion, 34L, 34R, 34W...receiving portion, 34a, 34d...recess, 34b, 34e...screw fastening portion, 34a1, 34a2...side wall, 34c, 34f...prevention portion, 34b1...screw hole, 34a3...bottom surface, 34d1, 34d2...inclined surface 70L, 70R... receiving portion, 70a... recess, 70a1, 70a2... side wall, 70a3... bottom surface, 70b... screw fastening portion, 70b1... screw hole, 70c... retaining portion, 70M... ring portion, 70d... upper bridge portion, 70h... through hole 35...Lower case part 36...upper case portion, 36a...opening portion, 36b...light-transmitting plate portion 37...Lower cover 40L, 40R, 40W, 50... Leaf spring, 41, 51... Main body portion, 41a, 51a... Screw passage hole, 42, 52... Handle portion, 43, 53... Temporary fixing portion, 43a, 53a... Claw portion, 44, 54... Anti-pullout end portion, 45, 55... Inclined side portion, B...Screw, L...Indicator light, Ax...Rotation axis, Sp...Gap,

Claims

1. A mirror unit that reflects display light from a display device so as to guide it to a projection member, a first mirror that reflects the display light; a second mirror that reflects the display light from the first mirror; a first mirror holding portion that holds the first mirror so that it cannot rotate; a second mirror holding portion that holds the second mirror rotatably around a rotation axis; a first elastic member that presses the first mirror against the first mirror holding portion; a second elastic member that presses the second mirror against the second mirror holding portion, The first elastic member and the second elastic member are formed in a common shape. Mirror unit.

2. the first elastic member and the second elastic member have contact portions formed in a common shape, the contact portion of the first elastic member is in either a contact state or a non-contact state with the first mirror holding portion, the contact portion of the second elastic member is in either a contact state or a non-contact state with the second mirror holding portion, 2. The mirror unit according to claim 1.

3. the contact portion is a temporary fixing portion that can be temporarily fixed to a part of the first mirror holding portion or the second mirror holding portion in the contact state; 3. The mirror unit according to claim 2.

4. The first elastic member and the second elastic member are a main body formed in a flat plate shape; a retaining end portion located at one end in the longitudinal direction of the main body portion and retained relative to the corresponding first mirror holding portion or second mirror holding portion, a hole through which a screw can pass is formed at the other end of the main body in the longitudinal direction; the screws fix the first elastic member and the second elastic member to the corresponding first mirror holding portion and the second mirror holding portion, respectively, more firmly than the temporary fixation.

4. The mirror unit according to claim 3.

5. The temporary fixing portion is located closer to the other end than the hole.

5. The mirror unit according to claim 4.

6. the first mirror holding portion and the second mirror holding portion are configured by one or more members selected from a housing, an inner case, and a bearing stay; 6. The mirror unit according to claim 1.

Images