Head-up display device

Abstract

To provide a head-up display (HUD) device which can inhibit stray light with a simple structure.SOLUTION: A head-up display device emits display light showing an image to a translucent member, such as a windshield of a vehicle, and displays the image as a virtual image. The head-up display device includes: a display part 10 which generates the display light; a concave mirror unit; and a case 70 which houses the concave mirror unit on the front side. The concave mirror unit includes: a concave mirror which reflects the display light L generated by the display part 10 toward the translucent member; and a support part which rotatably supports the concave mirror 31. The case 70 has through holes O1 to O5 at positions covered with the support part from the front side. The support part is fixed to the case 70 by screws inserted into the through holes O1 to O5 from the rear side of the case 70.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a head-up display device. [Background technology]

[0002] There is known a head-up display (HUD) device that projects display light representing an image toward a light-transmitting member (for example, a vehicle windshield) and displays the image as a virtual image. For example, Patent Document 1 discloses a conventional HUD device that includes a concave mirror unit having a concave mirror that reflects the display light toward the light-transmitting member and a support that rotatably supports the concave mirror. In the HUD device disclosed in Patent Document 1, the support is screwed to the case from the front side, thereby attaching the concave mirror unit to the case (see FIG. 6 in the document). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-120209 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a configuration in which a concave mirror unit is screwed to a case from the front side, as in the HUD device disclosed in Patent Document 1, the screw head is located in the space on the front side of the case (i.e., the space through which the display light passes), so there is a risk that the display light will be reflected by the screw head and generate stray light (light unnecessary for display). In order to suppress stray light, a dedicated cover for covering the screw head can be provided, but this may increase the number of parts and complicate the configuration.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide a head-up display device that can suppress stray light with a simple configuration. [Means for solving the problem]

[0006] In order to achieve the above object, a head-up display device according to the present invention comprises: A head-up display device that emits display light representing an image toward a light-transmitting member and displays the image as a virtual image, A display unit that generates the display light; The display unit generates before reaching the light-transmitting member Display light Against A mirror that reflects light, Support a mirror unit having a support portion for supporting the mirror; a case that houses the mirror unit on a front side, the case has a through hole at a position covered by the support part from the front side, The support portion is fixed to the case by a screw that is inserted into the through hole from the back side of the case. Effect of the Invention

[0007] According to the present invention, stray light can be suppressed with a simple configuration. [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram showing a state in which a head-up display (HUD) device according to an embodiment of the present invention is mounted on a vehicle. [Diagram 2] FIG. 2 is a perspective view of a HUD device. [Diagram 3] FIG. [Figure 4] FIG. 2 is a perspective view of the HUD device without the case. [Diagram 5] FIG. 2 is a perspective view of a concave mirror unit, a transmission unit, and a drive unit. [Figure 6] FIG. 2 is a plan view of the HUD device. [Figure 7] FIG. 2 is a rear view of the HUD device without the rear cover. [Figure 8] FIG. 2 is a perspective view of a main part of the HUD device with the rear cover omitted. [Figure 9]10A to 10C are diagrams for explaining an example of a process for assembling each component into a case. [Figure 10] 10A to 10C are diagrams for explaining an example of a process for assembling each component into a case. [Figure 11] 10A to 10C are diagrams for explaining an example of a process for assembling each component into a case. [Figure 12] 12(a) is a perspective view of the main part in a state in which the concave mirror unit is set on the jig, and (b) is a schematic cross-sectional view of the jig and the second support part taken along line AA shown in FIG. 12(a). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] An embodiment of the present invention will be described with reference to the drawings.

[0010] A head-up display (HUD) device 100 according to this embodiment is disposed, for example, in a dashboard 2 of a vehicle 1, as shown in FIG. 1. The HUD device 100 emits a display light L toward a windshield 3. The display light L reflected by the windshield 3 travels toward a user 4 (mainly the driver of the vehicle 1), and causes the user 4 to visually recognize an image represented by the display light L as a virtual image V. The virtual image V is displayed in front of the vehicle 1 through the windshield 3. This allows the user 4 to observe the virtual image V superimposed on the scenery ahead. The virtual image V displays various information related to the vehicle 1 (hereinafter referred to as vehicle information). The vehicle information includes not only information about the vehicle 1 itself, but also information about the outside of the vehicle 1.

[0011] As shown in Figures 2 to 8, the HUD device 100 includes a display unit 10, a plane mirror 20, a concave mirror unit 30 including a concave mirror 31, a transmission unit 40, a drive unit 50, a circuit board 60, a case 70, and a rear cover 80.

[0012] In the following, each component will be described assuming that the upper side of the vehicle 1 is the front side and the lower side of the vehicle 1 is the back side when the HUD device 100 is installed in the vehicle 1. In the drawings, the front side is indicated as "F" and the back side is indicated as "B". The HUD device 100 includes a front cover that is attached to the case 70 from the front side as a component not shown. The front cover is provided with an emission port 101 (see FIG. 1) that opens toward the front side, and the HUD device 100 emits display light L from the emission port 101 toward the windshield 3. A translucent cover not shown is attached to the emission port 101.

[0013] The display unit 10 displays an image, and emits display light L representing the image upward (front side) as shown in FIG. 2. The display unit 10 has, as a configuration for generating the display light L (hereinafter referred to as a display light generating unit), for example, an LCD (Liquid Crystal Display) and a backlight for illuminating the LCD from behind. The LCD is, for example, a TFT (Thin Film Transistor) type. The backlight is, for example, composed of an LED (Light Emitting Diode) and a light guide member. In addition to the display light generating unit, the display unit 10 has, as shown in FIG. 7, a display substrate 11 electrically connected to the display light generating unit, a heat sink 12 having heat dissipation fins, and a display housing 13 formed of resin or the like and housing the display light generating unit, and is unitized. Note that FIG. 7 is a view (rear view) of the HUD device 100 from the back side with the rear cover 80 omitted. The display substrate 11 is fixed to the back side of the display housing 13. The heat sink 12 is attached to the rear side of the display housing 13, sandwiching the display board 11. The manner in which the display unit 10 is fixed to the case 70 will be described later.

[0014] 2, the plane mirror 20 reflects the display light L emitted from the display unit 10 toward the front side toward the concave mirror 31. The plane mirror 20 is fixed to the case 70 via a holder 21.

[0015] 5, the concave mirror unit 30 mainly includes a concave mirror 31, and a pair of a first support part 32 and a second support part 33 that support the concave mirror 31 rotatably about an axis line AX. The first support part 32 and the second support part 33 are positioned on either side of the concave mirror 31 in the direction in which the axis line AX extends.

[0016] The concave mirror 31 has a reflecting surface R that reflects the display light L from the plane mirror 20 toward the windshield 3 while magnifying it. As a result, the virtual image V viewed by the user 4 is an enlarged version of the image displayed on the display unit 10. The concave mirror 31 has a pair of first and second shaft portions 31a and 31b formed in a cylindrical shape. The pair of first and second shaft portions 31a and 31b protrude in opposite directions from the side surface of the concave mirror 31 and extend along the axis AX.

[0017] The first support part 32 has a base part 321 and a bearing 322 provided on the front side of the base part 321 and supporting the first shaft part 31a rotatably around the axis line AX. The base part 321 is provided with bosses B1 and B2 protruding toward the front side. The boss B1 corresponds to a screw S1 (see FIG. 11) for fixing the first support part 32 to the case 70. The boss B2 corresponds to a screw S2 (see FIG. 11) for fixing the first support part 32 to the case 70. The second support portion 33 has a base portion 331 and a bearing 332 provided on the front side of the base portion 331 and supporting the second shaft portion 31b rotatably around the axis line AX. The base portion 331 is provided with bosses B3, B4, and B5 protruding toward the front side. The boss B3 corresponds to the screw S3 (see FIG. 11) for fixing the second support portion 33 to the case 70. The boss B4 corresponds to the screw S4 (see FIG. 11) for fixing the second support portion 33 to the case 70. The boss B5 corresponds to the screw S5 (see FIG. 11) for fixing the second support portion 33 to the case 70. Each of the bosses B1 to B5 has a bottomed hole extending from the back side to the front side, and a screw hole corresponding to the screws S1 to S5 described below. Therefore, even if the screws S1 to S5 are fastened to the bosses B1 to B5 as described below, the screws S1 to S5 are not exposed on the front side of the bosses B1 to B5. The manner in which the concave mirror unit 30 is fixed to the case 70 will be described later.

[0018] The transmission unit 40 is configured to transmit the power of the drive unit 50 to the concave mirror 31, and mainly has a flat lever 41 provided on the concave mirror 31 and a moving unit 42 that moves in response to the operation of the drive unit 50, as shown in Fig. 5. The lever 41 is provided below the second shaft portion 31b located on the left side in Fig. 5 and protrudes from the side surface of the concave mirror 31. The moving unit 42 is formed, for example, in a shape that sandwiches the lever 41.

[0019] The driving unit 50 is configured to transmit power to the concave mirror 31 via the transmission unit 40, thereby rotating the concave mirror 31. As shown in FIG. 5, FIG. 7, or FIG. 8, the driving unit 50 has a motor M and a driving housing 51 to which the motor M is attached. The motor M is, for example, a stepping motor, and is driven by the control of a control unit mounted on a circuit board 60. As shown in FIG. 5, a guide shaft G extending along the direction in which the main surface of the lever 41 faces is attached to the driving housing 51. The motor M moves the moving unit 42 along the guide shaft G via a gear mechanism (not shown). As the moving unit 42 moves, the lever 41 sandwiched by the moving unit 42 also moves. In this way, the driving unit 50 moves the moving unit 42 and the lever 41 to rotate the concave mirror 31 around the axis AX. The manner in which the driving unit 50 is fixed to the case 70 will be described later.

[0020] The circuit board 60 is a printed circuit board on which various circuits are formed and a control unit consisting of a microcomputer is mounted. The circuit board 60 is electrically connected to each of the display unit 10 (specifically, the display board 11) and the drive unit 50 (specifically, the motor M) via wiring such as FPC (Flexible Printed Circuits). The control unit mounted on the circuit board 60 controls the overall operation of the HUD device 100, controls the rotational drive of the concave mirror 31 via the drive unit 50, and controls the display operation of the display unit 10. The control unit communicates with a system such as an ECU (Electronic Control Unit) that controls each part of the vehicle 1, and causes the display unit 10 to display an image showing vehicle information.

[0021] The case 70 is made of synthetic resin or metal and has a light-blocking property, is formed into a box shape, and houses the display unit 10, the plane mirror 20, the concave mirror unit 30, the transmission unit 40, and the drive unit 50 in positions that fulfill the above-mentioned functions.

[0022] First, the front side of the case 70 will be described with reference to Figs. 2, 3, and 6. An optical path space S through which the display light L passes is formed on the front side of the case 70. A housing section 71 for housing the concave mirror 31 is formed in a portion corresponding to the bottom of the case 70. As shown in Fig. 6, a first mounting section 72 on which the first support section 32 is mounted and a second mounting section 73 on which the second support section 33 is mounted are provided on both sides of the housing section 71 in the case 70. The first mounting section 72 and the second mounting section 73 are positioned on either side of the housing section 71 in the direction in which the axis line AX extends.

[0023] Next, the back side of the case 70 will be described with reference to Figs. 7 and 8. A fixing portion 74 to which the driving portion 50 is fixed is provided on the back side of the second mounting portion 73 of the case 70. A hole 74a that communicates between the back side and the front side of the case 70 is formed in a portion of the case 70 adjacent to the fixing portion 74. This hole 74a is formed to pass the transmission portion 40 located between the driving portion 50 fixed to the fixing portion 74 provided on the back side of the case 70 and the concave mirror 31 accommodated in the accommodation portion 71 on the front side of the case 70. The hole 74a is formed to have a size that does not hinder the movement of the transmission portion 40.

[0024] Further, a mounting portion 75 in which the display unit 10 is mounted is provided on the back side of the case 70. A communication opening 75a is formed in the mounting portion 75, which connects the back side and the front side of the case 70. The display unit 10 fixed in the mounting portion 75 from the back side emits display light L from the communication opening 75a toward the front side of the case 70.

[0025] Further, a board fixing portion 76 to which the circuit board 60 is fixed is provided on the back side of the storage portion 71 in the case 70. The circuit board 60 is engaged by hooks H1, H2 provided on the board fixing portion 76, for example, and fixed to the back side of the case 70.

[0026] The rear cover 80 is made of a material having light-shielding properties, and is attached to the case 70 from the back side, as shown in Fig. 2. The rear cover 80 is fixed to the case 70 by an engagement means using, for example, a hook. The rear cover 80 covers the display unit 10, the drive unit 50, and the circuit board 60 fixed to the back side of the case 70 from the back side. In other words, the display unit 10, the drive unit 50, and the circuit board 60 are located between the rear cover 80 and the case 70.

[0027] In the HUD device 100 configured as described above, display light L is emitted from the display unit 10 and reflected by the plane mirror 20 and the concave mirror 31 in this order, and is emitted from the emission port 101 to the outside of the HUD device 100 and proceeds toward the windshield 3. As the display light L is reflected by the windshield 3, a virtual image V is displayed in front of the windshield 3 as viewed by the user 4.

[0028] (Fixing manner of concave mirror unit 30, drive unit 50 and display unit 10 to case 70) From here, the manner in which the concave mirror unit 30, the drive section 50 and the display section 10 are fixed to the case 70 will be described.

[0029] The concave mirror unit 30 is fixed to the case 70 by screws S1 to S5 (see FIG. 11) that are inserted from the back side of the case 70. Specifically, in the case 70, the first mounting portion 72 on which the first support portion 32 is placed from the front side is formed with through holes O1 and O2 penetrating the case 70, as shown in Fig. 7. The first support portion 32 is fixed to the case 70 by a screw S1 that passes through the through hole O1 from the back side of the case 70 and is fastened to the boss B1, and a screw S2 that passes through the through hole O2 from the back side of the case 70 and is fastened to the boss B2. In addition, the second mounting portion 73 on which the second support portion 33 is placed from the front side is formed with through holes O3 to O5 penetrating the case 70, as shown in Fig. 7. The second support portion 33 is fixed to the case 70 by a screw S3 that passes through the through hole O3 from the back side of the case 70 and is fastened to the boss B3, a screw S4 that passes through the through hole O4 from the back side of the case 70 and is fastened to the boss B4, and a screw S5 that passes through the through hole O5 from the back side of the case 70 and is fastened to the boss B5. In this manner, the concave mirror unit 30 is inserted from the back side of the case 70, and is fixed to the case 70 by the screws S1 to S5 fastened to the first support portion 32 and the second support portion 33.

[0030] The driving unit 50 is fixed to the fixing portion 74 of the case 70 from the back side of the case 70 by the screws S3 and S4. Specifically, the driving housing 51 has insertion holes 51a and 51b corresponding to the through holes O3 and O4 provided in the case 70, as shown in FIG. 7 and FIG. 11. The driving housing 51 is fixed to the case 70 by the screw S3 which passes through the insertion hole 51a and the through hole O3 of the case 70 from the back side of the case 70 and is fastened to the boss B3, and the screw S4 which passes through the insertion hole 51b and the through hole O4 from the back side of the case 70 and is fastened to the boss B4. As a result, the case 70 and the driving housing 51 are interposed between the bosses B3 and B4 and the heads of the screws S3 and S4. That is, the screws S3 and S4 fix both the second support portion 33 and the driving housing 51 to the case 70.

[0031] The display unit 10 is fixed to the mounting portion 75 of the case 70 from the back side of the case 70 by screws S6 and S7 (see FIG. 11). Specifically, the mounting portion 75 of the case 70 is provided with, for example, two bosses (not shown) that protrude toward the back side, one of the bosses is provided with a screw hole O6, and the other boss is provided with a screw hole O7. Furthermore, the display housing 13 of the display unit 10 is provided with through holes that correspond to the screw holes O6 and O7, respectively, and through which the screws S6 and S7 are inserted. The display housing 13 is fixed to the case 70 by the screws S6 and S7 that are fastened from the back side toward the front side, so that the display unit 10 is mounted to the mounting portion 75 provided on the back side of the case 70.

[0032] (Example of process for assembling each component into case 70) From here on, an example of a process for assembling each member into the case 70 will be described mainly with reference to FIGS.

[0033] First, as shown in Fig. 9, the concave mirror unit 30 and the plane mirror 20 held by the holder 21 (hereinafter referred to as the plane mirror unit) are set on a jig 5 placed on a flat surface. At this time, the concave mirror unit 30 and the plane mirror unit are set on the jig 5 upside down from the state in which the HUD device 100 is mounted on the vehicle 1. Therefore, the front side "F" of the HUD device 100 is the lower side in Fig. 9.

[0034] The jig 5 is provided with a first installation section 5a in which the first support section 32 of the concave mirror unit 30 is set, a second installation section 5b in which the second support section 33 is set, and other installation sections in which the plane mirror unit and the like are set. As shown in Fig. 12(a), a rotation prevention section 5c is provided at a position adjacent to the second installation section 5b in the jig 5, which clamps the lever 41 provided on the concave mirror 31 and prevents the concave mirror 31 from rotating (relative to the first support section 32 and the second support section 33) during assembly. This rotation prevention section 5c allows the concave mirror 31 to be stored in the storage section 71 of the case 70 in a desired orientation.

[0035] The concave mirror unit 30 is aligned with the jig 5 by utilizing the protrusions of bosses B1 to B5 provided on the first support portion 32 and the second support portion 33. Regarding boss B3 as a representative example, as shown in the cross section of FIG. 12(b), a groove into which the boss B3 fits is formed in the second installation portion 5b of the jig 5. The same is true for the relationship between the bosses B1 and B2 and the first installation portion 5a, and the relationship between the bosses B4 and B5 and the second installation portion 5b. In FIG. 12(b), the reference symbols B3 and B4 of the bosses corresponding to the screw holes formed on the back side of the bosses are given to the screw holes formed on the back side of the bosses.

[0036] As described above, the case 70 is placed over the concave mirror unit 30 and the plane mirror unit set in the jig 5 with the front side facing downward. At this time, the concave mirror unit 30 and the plane mirror unit are each housed in an appropriate position on the front side of the case 70.

[0037] Next, as shown in FIG. 10, the driving unit 50 (with the moving unit 42 assembled thereto; the rest omitted), the display unit 10, and the circuit board 60 are installed on the back side of the case 70. Specifically, on the back side of the case 70, the driving unit 50 is installed on the fixed portion 74, the display unit 10 is installed on the placement portion 75, and the circuit board 60 is installed on the board fixing portion 76. The positioning of each part with respect to the case 70 during the installation is performed, for example, by inserting a positioning protrusion provided on one of the case 70 and a specific member into a positioning hole provided on the other. The same applies to the positioning of the concave mirror unit 30 and the plane mirror unit with respect to the case 70 described with reference to FIG. 9. When installing the driving unit 50 on the fixed portion 74, the moving unit 42 assembled to the driving unit 50 is set so as to sandwich the lever 41 provided on the concave mirror 31 through the hole 74a (see FIG. 8). In other words, at least a portion of the transmission part 40 is located where the hole 74a is formed.

[0038] As described above, the circuit board 60 is fixed to the board fixing part 76 by the hooks H1 and H2. When the hooks H1 and H2 are provided integrally with the board fixing part 76 using resin or the like, holes are formed near the hooks H1 and H2 due to restrictions on the molding die. However, in the HUD device 100 according to this embodiment, the front side of the board fixing part 76 where such holes are formed serves as the housing part 71 that houses the concave mirror 31. Therefore, the concave mirror 31 can cover and hide such holes, and it is possible to prevent the image of the holes from being reflected and being seen by the user 4.

[0039] After the drive unit 50, display unit 10, and circuit board 60 are placed on the back side of the case 70, the drive unit 50 and display unit 10 are each connected to the circuit board 60 by wiring such as an FPC (not shown).

[0040] The driving unit 50, the display unit 10, and the circuit board 60 are installed on the back side of the case 70, and the driving unit 50 and the display unit 10 are connected to the circuit board 60 by wiring. Then, as shown in FIG. 11, each member is fixed to the case 70 by the screws S1 to S7 that are fastened from the back side of the case 70 to the front side. Specifically, as described above, the first support part 32 of the concave mirror unit 30 is fixed to the case 70 by the screws S1 and S2. In addition, the second support part 33 is fixed to the case 70 by the screws S3 to S5. Of these screws S3 to S5, the screws S4 and S5 are also used to fix the driving unit 50 to the back side of the case 70. In addition, the display part 10 is fixed to the back side of the case by the screws S6 and S7. When the driving housing 51 is fixed to the case 70, the case 70 and the driving housing 51 are interposed between the boss B3 and the head of the screw S3, as shown in FIG. 12(b). Although not shown, the case 70 and the drive housing 51 are also interposed between the boss B4 and the head of the screw S4.

[0041] As described above, after each component is fixed to case 70, rear cover 80 is attached to the back side of case 70. Thereafter, case 70 with each component fixed and rear cover 80 attached is turned over, and then a front cover (not shown) is attached to the front side of case 70.

[0042] The present invention is not limited to the above-described embodiment and drawings, and can be modified (including the deletion of components) as appropriate without departing from the spirit of the present invention.

[0043] The display unit 10 is not limited to one using an LCD, and may be one using an OLED (Organic Light-Emitting Diode). The display unit 10 may also be one using a reflective display device such as a DMD (Digital Micro Mirror Device) or LCOS (Liquid Crystal On Silicon).

[0044] Further, a plane mirror other than the plane mirror 20 may be provided in the optical path of the display light L connecting the plane mirror 20 and the concave mirror 31. The number of plane mirrors to be used and how to fold the optical path of the display light L can be appropriately changed according to the design. Further, instead of the concave mirror unit 30 as an example of a mirror unit, a mirror unit having a mirror other than the concave mirror 31 may be adopted. The mirror other than the concave mirror 31 may be a plane mirror or a free-form mirror as long as it reflects the display light L toward a light-transmitting member (such as the windshield 3). Note that the mirror that reflects the display light L toward the light-transmitting member may be a mirror that reflects the display light L toward the light-transmitting member in the optical path of the display light L, and may be provided at a position where the display light L reflected by the mirror eventually reaches the light-transmitting member.

[0045] Further, the projection target (light-transmitting member) of the display light L is not limited to the windshield 3 of the vehicle 1, but may be a combiner constituted by a plate-shaped half mirror, a hologram element, or the like.

[0046] In addition, the type of vehicle 1 on which the HUD device 100 is mounted is not limited, and the HUD device 100 can be applied to various vehicles such as four-wheeled motor vehicles, motorcycles, etc. In addition, the HUD device 100 may be mounted on vehicles other than the vehicle 1, such as an airplane, a ship, a snowmobile, etc.

[0047] In the above, an example has been shown in which the transmission unit 40 is composed of the lever 41 provided on the concave mirror 31 and the moving unit 42 whose movement is controlled by the driving unit 50, but the configuration of the transmission unit 40 is not limited to this and is arbitrary. For example, the transmission unit 40 may be a member that sandwiches the concave mirror 31 that does not have the lever 41 and whose movement is controlled by the driving unit 50. In addition, the transmission unit 40 may be composed of a first gear unit provided on the concave mirror 31 and a second gear unit that meshes with the first gear unit and is rotationally driven by the driving unit 50.

[0048] In addition, the number of screws for fixing each part to the case 70, the number of bosses provided on each of the first support part 32 and the second support part 33, and the number of through holes provided in the case 70 are arbitrary as long as the problem can be solved.

[0049] In the above, the example in which the driving unit 50 corresponds to the second support unit 33 and is provided on the rear side of the second support unit 33 has been described, but the present invention is not limited to this. For example, the driving unit 50 may correspond to the first support unit 32 and be provided on the rear side of the first support unit 32.

[0050] The HUD device 100 described above emits display light L representing an image toward a light-transmitting member (for example, the windshield 3) and displays the image as a virtual image V. The HUD device 100 includes a display unit 10 that generates the display light L, a concave mirror unit 30 (an example of a mirror unit in the claims), and a case 70 that houses the concave mirror unit 30 on the front side. The concave mirror unit 30 includes a concave mirror 31 (an example of a mirror in the claims) that reflects the display light L generated by the display unit 10 toward the light-transmitting member, and supports (first support unit 32, second support unit 33) that support the concave mirror 31 rotatably around an axis AX.

[0051] (1-1) In the HUD device 100, the case 70 has through holes O1 to O5 at positions covered from the front side by the support parts (first support part 32, second support part 33). The support parts are fixed to the case 70 by screws S1 to S5 that are inserted into the through holes O1 to O5 from the back side of the case. With this configuration, the head of the screw for fixing the concave mirror unit 30 to the case 70 is located on the back side of the case 70, and the shaft (under the neck) of the screw is covered by the support. In this way, the screw for fixing the concave mirror unit 30 to the case 70 is not exposed in the optical path space S formed on the front side of the case 70, and there is no need to provide a dedicated cover for covering the screw. Therefore, with a simple configuration, it is possible to prevent the occurrence of stray light caused by the reflection of the display light L by the screw. Note that, from the viewpoint of preventing stray light caused by the screw, the fixing manner of the drive unit 50 to the case 70 is arbitrary, and the drive unit 50 may be fixed to the front side of the case 70.

[0052] (1-2) The HUD device 100 also includes a drive unit 50 that rotationally drives the concave mirror 31, and includes a pair of support units, a first support unit 32 and a second support unit 33, positioned on either side of the concave mirror 31 in the direction along which the axis AX extends. The drive unit 50 is provided in correspondence with one of the first support unit 32 and the second support unit 33, and is fixed to the case 70 from the back side. This configuration allows the direction in which the concave mirror unit 30 is fastened to the case 70 with screws (e.g., screws S1 to S5) (from back to front) to be the same as the direction in which the drive unit 50 is fixed to the case 70, making assembly easier. Note that any method for fixing the drive unit 50 to the case 70 may be used, but it is preferable to use screws (e.g., screws S3 and S4).

[0053] (1-3) The HUD device 100 also includes a circuit board 60 electrically connected to each of the display unit 10 and the drive unit 50. The case 70 has a housing portion 71 on the front side for housing the concave mirror 31, and the circuit board 60 is fixed to the back side of the housing portion 71 in the case 70 (for example, to a board fixing portion 76). With this configuration, the direction in which the concave mirror unit 30 is screwed into the case 70 (from back to front) and the direction in which the drive unit 50 and circuit board 60 are fixed to the case 70 can be the same, making assembly easier.

[0054] (1-4) The case 70 has a mounting section 75 on the back side where the display unit 10 is mounted, and the mounting section 75 has a communication port 75a that connects the back side and the front side of the case 70. The display unit 10 is fixed to the case 70 from the back side and mounted in the mounting section 75, and emits display light L that reaches the concave mirror 31 from the communication port 75a toward the front side of the case 70. With this configuration, the direction in which the concave mirror unit 30 is screwed to the case 70 (the direction from the back to the front) and the direction in which the drive unit 50, the circuit board 60, and the display unit 10 are fixed to the case 70 can be the same, making assembly easy. In addition, when the drive unit 50, the circuit board 60, and the display unit 10 are all located on the back side of the case 70, the work of connecting the wiring between the circuit board 60 and each of the drive unit 50 and the display unit 10 can be made easy.

[0055] (2-1) A HUD device 100 according to another aspect different from that of (1-1) above includes, in addition to the display unit 10, the concave mirror unit 30, and the case 70, a drive unit 50 that transmits power to the concave mirror 31 via the transmission unit 40 to rotate the concave mirror 31, and a circuit board 60 that is fixed to the back side of the case 70 and electrically connected to the drive unit 50. A hole 74a through which the transmission unit 40 passes is formed between the drive unit 50 and the concave mirror 31 in the case 70, and the drive unit 50 is provided corresponding to one of the first support unit 32 and the second support unit 33, and is fixed to the case 70 from the back side. With this configuration, the circuit board 60 and the drive unit 50 can be fixed to the case 70 in the same direction (from the back to the front), and since the circuit board 60 and the drive unit 50 are located on the back side of the case 70, it is easy to connect them with wires. In other words, this configuration provides good assembly properties.

[0056] (2-2) Moreover, the display unit 10 is fixed to the case 70 from the back side and disposed in the mounting portion 75, and emits display light L that reaches the concave mirror 31 toward the front side of the case 70 from the communication port 75a. With this configuration, the drive unit 50, the circuit board 60, and the display unit 10 can be fixed to the case 70 in the same direction, facilitating assembly. Furthermore, when the drive unit 50, the circuit board 60, and the display unit 10 are all located on the rear side of the case 70, the wiring connection between the circuit board 60 and the drive unit 50 and the display unit 10 can be facilitated.

[0057] (2-3) Moreover, the circuit board 60 is fixed to the rear side of the housing portion 71 in the case 70 (the portion on the front side of the case 70 that houses the concave mirror 31). This configuration allows the circuit board 60 to be located close to the drive unit 50 provided corresponding to one of the first support portion 32 and the second support portion 33, which in particular facilitates the work of connecting the wiring between the circuit board 60 and the drive unit 50. It also makes it possible to prevent the wiring layout from becoming complicated.

[0058] (2-4) In addition, the HUD device 100 includes a rear cover 80 that is attached to the back side of the case 70, and the drive unit 50, the circuit board 60, and the display unit 10 are positioned between the rear cover 80 and the case 70. With this configuration, the direction in which the drive unit 50, the circuit board 60, and the display unit 10 are fixed to the case 70 (from the back to the front) can be the same as the direction in which the rear cover 80 is attached to the case 70 after the fixing, making assembly easy. Also, since the drive unit 50, the circuit board 60, and the display unit 10 can be covered and protected from the back side at once with the rear cover 80, not only is assembly easy, but the structure of the HUD device 100 can be prevented from becoming complicated.

[0059] In the above description, in order to facilitate understanding of the present invention, descriptions of well-known technical matters have been omitted as appropriate. [Explanation of symbols]

[0060] 100...head-up display (HUD) device, 101...ejection port 1...vehicle, 2...dashboard, 3...windshield, 4...user L...display light, V...virtual image 10: display unit, 11: display board, 12: heat sink, 13: display housing 20... Plane mirror, 21... Holder 30…Concave mirror unit 31...Concave mirror, R...Reflecting surface, AX...Axis line 31a...first shaft part, 31b...second shaft part 32...First support part 321…Pedestal, B1, B2…Boss 322...Bearing 33…Second support part 331…Pedestal, B3, B4, B5…Boss 332...Bearing 40...Transmission section 41...lever, 42...moving part 50…Drive unit 51: Drive housing; 51a, 51b: Insertion holes M: Motor, G: Guide shaft 60...Circuit board 70…Case, S…Optical path space O1~O5…Through holes 71: storage section, 72: first placement section, 73: second placement section 74...fixing part, 74a...hole 75: installation portion, 75a: communication port, O6, O7: screw holes 76: Circuit board fixing part, H1, H2: Hook 80…Rear cover S1~S7…Screws 5...jig, 5a...first installation part, 5b...second installation part, 5c...rotation prevention part

Claims

1. A head-up display device that emits display light representing an image toward a light-transmitting member and displays the image as a virtual image, A display unit that generates the display light; a mirror unit including a mirror that reflects the display light generated by the display unit and reaching the light-transmitting member, and a support portion that supports the mirror; a case that houses the mirror unit on a front side, the case has a through hole at a position covered by the support part from the front side, The support portion is fixed to the case by a screw inserted into the through hole from the back side of the case. Head-up display device.

2. The support portion supports the mirror so that the mirror can rotate about a predetermined axis. The head-up display device according to claim 1 .

3. A drive unit that rotates the mirror is provided, The support portion includes a pair of a first support portion and a second support portion positioned on either side of the mirror in the direction in which the axis extends, the driving portion is provided corresponding to one of the first support portion and the second support portion, and is fixed to the case from the back side; The head-up display device according to claim 2 .

4. a circuit board electrically connected to the display unit and the drive unit, the case has a housing portion on a front side for housing the mirror, The circuit board is fixed to the back side of the housing portion in the case. The head-up display device according to claim 3 .

5. the case has a mounting portion on a rear side in which the display unit is mounted, The mounting portion is provided with a communication port that connects the back side and the front side of the case, the display unit is fixed to the case from the back side and disposed in the mounting portion, and emits the display light from the communication port toward the front side of the case, the display light reaching the mirror. The head-up display device according to any one of claims 1 to 4.

Images