WO2020196161A1

WO2020196161A1 - Head-up display device

Info

Publication number: WO2020196161A1
Application number: PCT/JP2020/011994
Authority: WO
Inventors: 翔太小池; 彰利小柴
Original assignee: 日本精機株式会社
Priority date: 2019-03-25
Filing date: 2020-03-18
Publication date: 2020-10-01
Also published as: CN216052434U; JPWO2020196161A1; DE112020001439T5; JP7396351B2; JP2024014917A

Abstract

This invention provides a head-up display (HUD) device with which stray light can be suppressed with a simple configuration.　This HUD device emits display light representing an image toward a transparent member such as the front windshield of a vehicle, thereby displaying the image as a virtual image. The HUD device is equipped with a display unit (10) for generating display light, a concave mirror unit, and a case (70) that accommodates the concave mirror unit on the front side. The concave mirror unit has a concave mirror for reflecting the display light generated by the display unit (10) toward the transparent member, and a support part for rotatably holding the concave mirror. The case (70) has through-holes (O1 – O5) at positions covered from the front side by the support part. The support part is secured to the case (70) by screws inserted into the through-holes (O1 – O5) from the back side of the case (70).

Description

Head-up display device

The present invention relates to a head-up display device.

A head-up display (HUD) device is known that emits display light representing an image toward a translucent member (for example, the windshield of a vehicle) and displays the image as a virtual image. As a conventional HUD device, for example, Patent Document 1 discloses a device including a concave mirror unit having a concave mirror that reflects display light toward a translucent member and a support portion that rotatably supports the concave mirror. In the HUD device disclosed in Patent Document 1, the concave mirror unit is attached to the case by screwing the support portion to the case from the front side (see FIG. 6 of the same document).

JP-A-2018-120209

In a configuration in which the concave mirror unit is screwed to the 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 (that is, the space through which the indicator light passes). The display light may be reflected by the screw head to generate stray light (unnecessary light 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.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a head-up display device capable of suppressing stray light with a simple configuration.

In order to achieve the above object, the head-up display device according to the present invention
A head-up display device that emits display light representing an image toward a translucent member and displays the image as a virtual image.
A display unit that generates the display light and
A mirror unit having a mirror that reflects the display light generated by the display unit toward the translucent member, and a support unit that rotatably supports the mirror about a predetermined axis.
A case for accommodating the mirror unit on the front side is provided.
The case has a through hole at a position where the support portion is covered 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.

According to the present invention, stray light can be suppressed with a simple configuration.

It is a figure which shows the mounting mode of the head-up display (HUD) device which concerns on one Embodiment of this invention in a vehicle. It is a perspective view of the HUD device. It is a perspective view of a case. It is a perspective view of the HUD apparatus which omitted the case. It is a perspective view of a concave mirror unit, a transmission part and a drive part. It is a top view of the HUD apparatus. It is a rear view of the HUD device which omitted the rear cover. It is the main part perspective view of the HUD apparatus which omitted the rear cover. It is a figure for demonstrating the example of the process of assembling each member to a case. It is a figure for demonstrating the example of the process of assembling each member to a case. It is a figure for demonstrating the example of the process of assembling each member to a case. (A) is a perspective view of a main part in a state where the concave mirror unit is set in the jig, and (b) is a schematic cross section of the jig and the second support part in the line AA shown in FIG. 12 (a). It is a figure.

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

As shown in FIG. 1, the head-up display device (HUD: Head-Up Display) device 100 according to the present embodiment is arranged, for example, in the dashboard 2 of the vehicle 1. The HUD device 100 emits the display light L toward the windshield 3. The display light L reflected by the windshield 3 heads toward the user 4 (mainly the driver of the vehicle 1), and causes the user 4 to visually recognize the image represented by the display light L as a virtual image V. The virtual image V is displayed in front of the vehicle 1 via the windshield 3. As a result, the user 4 can observe the virtual image V by superimposing it on the front landscape. The virtual image V displays various information about the vehicle 1 (hereinafter, referred to as vehicle information). The vehicle information includes not only the information of the vehicle 1 itself but also the external information of the vehicle 1.

As shown in FIGS. 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, and a case 70. And a rear cover 80.

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

By displaying an image, the display unit 10 emits a display light L representing the image upward (front side) as shown in FIG. The display unit 10 has, for example, an LCD (Liquid Crystal Display) and a backlight that illuminates the LCD from behind as a configuration for generating the display light L (hereinafter, referred to as a display light generation unit). The LCD is, for example, a TFT (Thin Film Transistor) type. The backlight is composed of, for example, an LED (Light Emitting Diode), a light guide member, or the like. As shown in FIG. 7, the display unit 10 is formed of a display substrate 11 electrically connected to the display light generation unit, a heat sink 12 having heat radiation fins, a resin, or the like, in addition to the display light generation unit. It has a display housing 13 for accommodating a display light generation unit, and is unitized. Note that FIG. 7 is a view (rear view) of the HUD device 100 without the rear cover 80 as viewed from the back side. The display board 11 is fixed to the back side of the display housing 13. The heat sink 12 is attached to the back side of the display housing 13 with the display board 11 interposed therebetween. The mode of fixing the display unit 10 to the case 70 will be described later.

The plane mirror 20 is made of, for example, a cold mirror, and as shown in FIG. 2, the display light L emitted by the display unit 10 toward the front side is reflected toward the concave mirror 31. The plane mirror 20 is fixed to the case 70 via the holder 21.

As shown mainly in FIG. 5, the concave mirror unit 30 includes a concave mirror 31 and a pair of first support portion 32 and second support portion 33 that rotatably support the concave mirror 31 about the axis AX. The first support portion 32 and the second support portion 33 are located with the concave mirror 31 in the direction in which the axis AX extends.

The concave mirror 31 has a reflecting surface R that magnifies the display light L from the plane mirror 20 and reflects it toward the windshield 3. As a result, the virtual image V visually recognized by the user 4 is an enlarged image displayed on the display unit 10. The concave mirror 31 has a pair of a first shaft portion 31a and a second shaft portion 31b formed in a columnar shape. The pair of first shaft portions 31a and second shaft portions 31b project from the side surfaces of the concave mirror 31 in opposite directions, and are provided so as to extend along the axis AX.

The first support portion 32 includes a pedestal portion 321 and a bearing 322 provided on the front side of the pedestal portion 321 and rotatably supporting the first shaft portion 31a around the axis AX. The pedestal portion 321 is provided with bosses B1 and B2 that project toward the front side. The boss B1 corresponds to a screw S1 (see FIG. 11) for fixing the first support portion 32 to the case 70. The boss B2 corresponds to a screw S2 (see FIG. 11) for fixing the first support portion 32 to the case 70.
The second support portion 33 has a pedestal portion 331 and a bearing 332 provided on the front side of the pedestal portion 331 and rotatably supports the second shaft portion 31b around the axis AX. The pedestal portion 331 is provided with bosses B3, B4, and B5 that project toward the front side. The boss B3 corresponds to a screw S3 (see FIG. 11) for fixing the second support portion 33 to the case 70. The boss B4 corresponds to a screw S4 (see FIG. 11) for fixing the second support portion 33 to the case 70. The boss B5 corresponds to a screw S5 (see FIG. 11) for fixing the second support portion 33 to the case 70.
Each of the bosses B1 to B5 is a bottomed hole extending from the back side to the front side, and is formed with a screw hole corresponding to the screws S1 to S5 described later. Therefore, as described later, even if the screws S1 to S5 are tightened to the bosses B1 to B5, the screws S1 to S5 are not exposed on the front side of the bosses B1 to B5. The mode of fixing the concave mirror unit 30 to the case 70 will be described later.

The transmission unit 40 is configured to transmit the power of the drive unit 50 to the concave mirror 31, and mainly for the operation of the flat plate-shaped lever 41 provided on the concave mirror 31 and the drive unit 50 as shown in FIG. It has a moving unit 42 that moves accordingly. The lever 41 is provided below the second shaft portion 31b located on the left side in FIG. 5 so as to project from the side surface of the concave mirror 31. The moving portion 42 is formed, for example, in a shape that sandwiches the lever 41.

The drive unit 50 has a configuration in which the concave mirror 31 is rotationally driven by transmitting power to the concave mirror 31 via the transmission unit 40. As shown in FIG. 5, FIG. 7 or FIG. 8, the drive unit 50 includes a motor M and a drive housing 51 to which the motor M is attached. The motor M is composed of, for example, a stepping motor, and is driven by the control of a control unit mounted on the circuit board 60. As shown in FIG. 5, a guide shaft G extending in the direction in which the main surface of the lever 41 faces is attached to the drive housing 51. The motor M moves the moving portion 42 along the guide shaft G via a gear mechanism (not shown). As the moving portion 42 moves, the lever 41 sandwiched between the moving portions 42 also moves. In this way, the drive unit 50 rotationally drives the concave mirror 31 around the axis AX by moving the moving unit 42 and the lever 41. The mode of fixing the drive unit 50 to the case 70 will be described later.

The circuit board 60 is a printed circuit board on which various circuits are formed and a control unit composed 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 an FPC (Flexible Printed Circuits). It is connected. 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.

The case 70 is formed of a synthetic resin or metal in a box shape having a light-shielding property, and accommodates each of the display unit 10, the plane mirror 20, the concave mirror unit 30, the transmission unit 40, and the drive unit 50 at positions satisfying the above functions. To do.

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. Further, a housing portion 71 for accommodating the concave mirror 31 is formed in a portion corresponding to the bottom of the case 70. As shown in FIG. 6, on both sides of the accommodating portion 71 in the case 70, a first mounting portion 72 on which the first support portion 32 is mounted and a second mounting portion on which the second support portion 33 is mounted are mounted. A rest portion 73 is provided. The first mounting portion 72 and the second mounting portion 73 are located with the accommodating portion 71 in the direction in which the axis AX extends.

Subsequently, 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 in the case 70. Further, a hole 74a for communicating 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. The hole 74a is a transmission portion 40 located between a drive portion 50 fixed to a fixing portion 74 provided on the back side of the case 70 and a concave mirror 31 housed in the accommodation portion 71 on the front side of the case 70. It is formed to pass through. The hole 74a is formed in a size that does not hinder the movement of the transmission portion 40.

Further, on the back side of the case 70, an arrangement portion 75 on which the display portion 10 is arranged is provided. The disposition portion 75 is formed with a communication port 75a that communicates the back side and the front side of the case 70. The display unit 10 fixed in the arrangement unit 75 from the back side emits the display light L from the communication port 75a toward the front side of the case 70.

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

The rear cover 80 is composed of a member having a light-shielding property, and is attached to the case 70 from the back side as shown in FIG. The rear cover 80 is fixed to the case 70 by, for example, an engaging means using 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. That is, the display unit 10, the drive unit 50, and the circuit board 60 are located between the rear cover 80 and the case 70.

In the HUD device 100 having the above configuration, the display light L emitted from the display unit 10 and reflected in the order of the plane mirror 20 and the concave mirror 31 is emitted from the injection port 101 to the outside of the HUD device 100 and reaches the windshield 3. Head. When the display light L is reflected by the windshield 3, the virtual image V is displayed in front of the windshield 3 when viewed from the user 4.

(Fixing mode of the concave mirror unit 30, the drive unit 50, and the display unit 10 with respect to the case 70)
From here, a mode of fixing the concave mirror unit 30, the drive unit 50, and the display unit 10 to the case 70 will be described.

The concave mirror unit 30 is fixed to the case 70 by screws S1 to S5 (see FIG. 11) inserted from the back side of the case 70.
Specifically, among the cases 70, through holes O1 and O2 penetrating the case 70 are formed in the first mounting portion 72 on which the first supporting portion 32 is mounted from the front side, as shown in FIG. ing. The first support portion 32 is formed by a screw S1 that is tightened to the boss B1 from the back side of the case 70 through the through hole O1 and a screw S2 that is tightened to the boss B2 from the back side of the case 70 through the through hole O2. Is fixed to. Further, as shown in FIG. 7, through holes O3 to O5 penetrating the case 70 are formed in the second mounting portion 73 on which the second supporting portion 33 is mounted from the front side. The second support portion 33 includes a screw S3 that is tightened to the boss B3 from the back side of the case 70 through the through hole O3, a screw S4 that is tightened to the boss B4 from the back side of the case 70 through the through hole O4, and the case 70. It is fixed to the case 70 by a screw S5 that is fastened to the boss B5 from the back side through the through hole O5. In this way, the concave mirror unit 30 is inserted from the back side of the case 70 and fixed to the case 70 by screws S1 to S5 tightened to the first support portion 32 and the second support portion 33.

The drive unit 50 is fixed to the fixing portion 74 of the case 70 from the back side of the case 70 by screws S3 and S4. Specifically, as shown in FIGS. 7 and 11, the drive housing 51 is formed with

insertion holes

51a and 51b corresponding to the through holes O3 and O4 provided in the case 70. The drive housing 51 passes through the screw S3 tightened to the boss B3 from the back side of the case 70 through the insertion hole 51a and the through hole O3 of the case 70, and the insertion hole 51b and the through hole O4 from the back side of the case 70. It is fixed to the case 70 by the screw S4 tightened to the boss B4. As a result, the case 70 and the drive 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 drive housing 51 to the case 70.

The display unit 10 is fixed to the arrangement portion 75 of the case 70 from the back side of the case 70 by screws S6 and S7 (see FIG. 11). Specifically, the disposition portion 75 of the case 70 is provided with, for example, two bosses (not shown) protruding toward the back side, one boss is provided with a screw hole O6, and the other boss is provided with a screw hole O6. A screw hole O7 is provided. Further, the display housing 13 of the display unit 10 is provided with through holes corresponding to the screw holes O6 and O7 and through which the screws S6 and S7 can be inserted. The display housing 13 is fixed to the case 70 by the screws S6 and S7 tightened from the back side to the front side, so that the display unit 10 is arranged in the arrangement portion 75 provided on the back side of the case 70. There is.

(Example of assembly process of each member to case 70)
From here on, an example of the process of assembling each member to the case 70 will be described mainly with reference to FIGS. 9 to 12.

First, as shown in FIG. 9, the concave mirror unit 30 and the plane mirror 20 (hereinafter referred to as a plane mirror unit) held by the holder 21 are set on the jig 5 installed on the flat surface. At this time, the concave mirror unit 30 and the plane mirror unit are set in 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" in the HUD device 100 is the lower side in FIG.

The jig 5 is set with a first installation portion 5a in which the first support portion 32 of the concave mirror unit 30 is set, a second installation portion 5b in which the second support portion 33 is set, a plane mirror unit, and the like. Installation part is provided. As shown in FIG. 12A, a lever 41 provided in the concave mirror 31 is sandwiched at a position adjacent to the second installation portion 5b in the jig 5, and the concave mirror 31 is rotated (first support) during assembly. A rotation prevention portion 5c is provided to prevent rotation with respect to the portion 32 and the second support portion 33). The rotation prevention portion 5c allows the concave mirror 31 to be accommodated in a desired posture with respect to the accommodating portion 71 of the case 70.

Further, the alignment of the concave mirror unit 30 with respect to the jig 5 is performed by using the protrusions of the bosses B1 to B5 provided on the first support portion 32 and the second support portion 33. The boss B3 will be described as a representative. As shown in the cross section in FIG. 12B, a groove into which the boss B3 is fitted is formed in the second installation portion 5b of the jig 5. 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 are the same. In FIG. 12B, the screw holes formed on the back side of the boss are designated by the boss symbols B3 and B4 corresponding to the screw holes.

As described above, the case 70 is put on the concave mirror unit 30 and the plane mirror unit set in the jig 5 so that the front side faces downward. At this time, each of the concave mirror unit 30 and the plane mirror unit is housed in an appropriate position on the front side of the case 70.

Subsequently, as shown in FIG. 10, a drive unit 50 (a moving unit 42 is assembled, hereinafter omitted), a display unit 10, and a circuit board 60 are installed on the back side of the case 70. Specifically, on the back side of the case 70, the drive unit 50 is installed in the fixing unit 74, the display unit 10 is installed in the disposing unit 75, and the circuit board 60 is installed in the substrate fixing unit 76. The alignment of each part with respect to the case 70 in the installation is performed, for example, by inserting a positioning protrusion provided on one of the case 70 and the predetermined member into the positioning hole provided on the other side. To. The same applies to the alignment of the concave mirror unit 30 and the plane mirror unit with respect to the case 70 described with reference to FIG. Further, when the drive unit 50 is installed in the fixed unit 74, the moving unit 42 assembled in the drive unit 50 is sandwiched between the lever 41 provided in the concave mirror 31 through the hole 74a (see FIG. 8). Set to. That is, at least a part of the transmission portion 40 is located at the formed portion of the hole 74a.

As described above, the circuit board 60 is fixed to the board fixing portion 76 by the hooks H1 and H2. When the hooks H1 and H2 are provided integrally with the substrate fixing portion 76 by resin or the like, holes are formed in the vicinity of the hooks H1 and H2 due to the restrictions of the molding die. However, in the HUD device 100 according to this embodiment, the front side of the substrate fixing portion 76 in which such a hole is formed is the accommodating portion 71 accommodating the concave mirror 31. Therefore, the concave mirror 31 can cover such a hole, and it is possible to prevent the image of the hole from being reflected and visible to the user 4.

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

A drive unit 50, a display unit 10, and a circuit board 60 are installed on the back side of the case 70, and after each of the drive unit 50 and the display unit 10 and the circuit board 60 are connected by wiring, the case is shown in FIG. Each member is fixed to the case 70 with screws S1 to S7 that are tightened from the back side to the front side of the 70. Specifically, as described above, the first support portion 32 of the concave mirror unit 30 is fixed to the case 70 with screws S1 and S2. Further, the second support portion 33 is fixed to the case 70 with screws S3 to S5. Of these screws S3 to S5, the screws S4 and S5 are shared with those for fixing the drive unit 50 to the back side of the case 70. Further, the display portion 10 is fixed to the back side of the case with screws S6 and S7. When the drive housing 51 is fixed to the case 70, as shown in FIG. 12B, the case 70 and the drive housing 51 are interposed between the boss B3 and the head of the screw S3. become. 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.

As described above, after fixing each member to the case 70, the rear cover 80 is attached to the back side of the case 70. Then, after each member is fixed and the case 70 to which the rear cover 80 is attached is turned upside down, a front cover (not shown) is attached to the front side of the case 70.

The present invention is not limited to the above embodiments and drawings. Changes (including deletion of components) can be made as appropriate without changing the gist of the present invention.

The display unit 10 is not limited to the one using the LCD, and the one using the OLED (Organic Light-Emitting Diode) may be adopted. Further, the display unit 10 may use, for example, a reflective display device such as a DMD (Digital Micromirror Device) or an LCOS (Liquid Crystal On Silicon).

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 used and how the optical path of the display light L is folded back can be appropriately changed according to the design. Further, instead of the concave mirror unit 30 as an example of the 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, a free curved mirror, or the like as long as it reflects the display light L toward the translucent member (windshield 3, etc.). The mirror that reflects the display light L toward the translucent member may be any mirror that reflects the display light L toward the transmissive member in the optical path of the display light L, and the display light L reflected by the mirror is used. It may be provided at a position where it reaches the translucent member as a result.

Further, the projection target (translucent member) of the display light L is not limited to the windshield 3 of the vehicle 1, and may be a combiner composed of a plate-shaped half mirror, a hologram element, or the like.

Further, the type of vehicle 1 on which the HUD device 100 is mounted is not limited, and can be applied to various vehicles such as motorcycles and motorcycles. Further, the HUD device 100 may be mounted on a vehicle other than the vehicle 1 such as an aircraft, a ship, and a snowmobile.

Further, in the above, the example in which the transmission unit 40 is composed of the lever 41 provided on the concave mirror 31 and the movement unit 42 whose movement is controlled by the drive unit 50 has been shown, but the configuration of the transmission unit 40 includes this. It is not limited and is optional. 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 drive unit 50. Further, the transmission unit 40 may include 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 drive unit 50. ..

Further, the number of screws for fixing each part to the case 70, the number of bosses provided in each of the first support part 32 and the second support part 33, the number of through holes provided in the case 70, and the like solve the problems. To the extent possible, it is optional.

Further, in the above, an example in which the drive unit 50 is provided on the back side of the second support unit 33 corresponding to the second support unit 33 has been shown, but the present invention is not limited to this. For example, the drive unit 50 may be provided on the back side of the first support unit 32 corresponding to the first support unit 32.

The HUD device 100 described above emits the display light L representing the image toward the translucent 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 display light L, a concave mirror unit 30 (an example of the mirror unit in the claim), 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 claim) that reflects the display light L generated by the display unit 10 toward the translucent member, and a support that rotatably supports the concave mirror 31 around the axis AX. It has a portion (first support portion 32, second support portion 33).

(1-1) In the HUD device 100, the case 70 has through holes O1 to O5 at positions where the support portions (first support portion 32, second support portion 33) are covered from the front side. Further, the support portion is fixed to the case 70 by screws S1 to S5 inserted from the back side of the case into the through holes O1 to O5.
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 with the support portion. Then, 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 it is not necessary to provide a dedicated cover for covering the screw. Therefore, with a simple structure, it is possible to prevent the generation of stray light due to the reflection of the display light L by the screw. From the viewpoint of preventing stray light caused by screws, the mode of fixing 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.

(1-2) Further, the HUD device 100 includes a drive unit 50 that rotationally drives the concave mirror 31, and as support portions, a pair of first support portions 32 and a first support portion 32 located across the concave mirror 31 in the direction in which the axis AX extends. There are two support portions 33. 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 direction in which the concave mirror unit 30 is fastened to the case 70 with screws (for example, screws S1 to S5) (the direction from the back to the front) and the direction in which the drive unit 50 is fixed to the case 70 are the same. And easy to assemble. The method of fixing the drive unit 50 to the case 70 is arbitrary, but it is preferable to use screws (for example, screws S3 and S4).

(1-3) Further, the HUD device 100 includes a circuit board 60 that is electrically connected to each of the display unit 10 and the drive unit 50. The case 70 has an accommodating portion 71 for accommodating the concave mirror 31 on the front side, and the circuit board 60 is fixed to the back side (for example, the substrate fixing portion 76) of the accommodating portion 71 in 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 and the circuit board 60 are fixed to the case 70 can be in the same direction. , Easy to assemble.

(1-4) Further, the case 70 has an arrangement portion 75 on which the display portion 10 is arranged on the back side, and the arrangement portion 75 has a communication port 75a for communicating the back side and the front side of the case 70. It is provided. Then, the display unit 10 is fixed to the case 70 from the back side and is arranged in the arrangement unit 75, and emits the 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 (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 are in the same direction. And easy to assemble. Further, when all of the drive unit 50, the circuit board 60, and the display unit 10 are located on the back side of the case 70, the wiring connection work between the circuit board 60 and each of the drive unit 50 and the display unit 10 becomes easy.

(2-1) The HUD device 100 according to a viewpoint different from the above (1-1) transmits power to the concave mirror 31 via the transmission unit 40 in addition to the display unit 10, the concave mirror unit 30 and the case 70. This includes a drive unit 50 that rotationally drives 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 for passing the transmission unit 40 is formed between the drive unit 50 and the concave mirror 31 in the case 70, and the drive unit 50 corresponds to one of the first support portion 32 and the second support portion 33. It is provided and fixed to the case 70 from the back side.
With this configuration, the directions in which the circuit board 60 and the drive unit 50 are fixed to the case 70 (directions from the back to the front) can be the same, and the circuit board 60 and the drive unit 50 are in the same direction. Since it is located on the back side of the above, it is easy to connect the two with wiring. That is, according to the configuration, the assembling property is good.

(2-2) Further, the display unit 10 is fixed to the case 70 from the back side and is arranged in the arrangement unit 75, and the display light reaches the concave mirror 31 from the communication port 75a toward the front side of the case 70. Inject L.
With this configuration, each of the drive unit 50, the circuit board 60, and the display unit 10 can be fixed to the case 70 in the same direction, which facilitates assembly. Further, when all of the drive unit 50, the circuit board 60, and the display unit 10 are located on the back side of the case 70, the wiring connection work between the circuit board 60 and each of the drive unit 50 and the display unit 10 becomes easy.

(2-3) Further, the circuit board 60 is fixed to the back side of the accommodating portion 71 (the portion accommodating the concave mirror 31 on the front side of the case 70) in the case 70.
With this configuration, the circuit board 60 can be positioned near the drive unit 50 provided corresponding to one of the first support unit 32 and the second support unit 33. Therefore, in particular, the circuit board 60 and the drive unit 50 Wiring connection work with and is easy. In addition, it is possible to suppress the complexity of the wiring layout.

(2-4) Further, the HUD device 100 includes a rear cover 80 attached to the case 70 from the back side, and the drive unit 50, the circuit board 60, and the display unit 10 are located between the rear cover 80 and the case 70.
With this configuration, the direction in which each of the drive unit 50, the circuit board 60, and the display unit 10 is fixed to the case 70 (direction from the back to the front) and the direction in which the rear cover 80 is attached to the case 70 after the fixing. Can be in the same direction, facilitating assembly. Further, since the rear cover 80 can cover and protect the drive unit 50, the circuit board 60, and the display unit 10 from the back side at once, not only is it easy to assemble, but also the complexity of the structure of the HUD device 100 is suppressed. be able to.

In the above description, in order to facilitate the understanding of the present invention, the description of known technical matters has been omitted as appropriate.

100 ... Head-up display (HUD) device, 101 ... Injection port 1 ... Vehicle, 2 ... Dashboard, 3 ... Front glass, 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 ... Reflective surface, AX ... Axis line 31a ... 1st axis, 31b ... 2nd axis 32 ... 1st Support part 321 ... Pedestal part, B1, B2 ... Boss 322 ... Bearing 33 ... Second support part 331 ... Pedestal part, B3, B4, B5 ... Boss 332 ... Bearing 40 ... Transmission part 41 ... Lever, 42 ... Moving part 50 ... Drive unit 51 ... Drive housing, 51a, 51b ... Insertion hole M ... Motor, G ... Guide shaft 60 ... Circuit board 70 ... Case, S ... Optical path space O1 to O5 ... Through hole 71 ... Accommodation unit, 72 ... First Mounting part, 73 ... Second mounting part 74 ... Fixed part, 74a ... Hole 75 ... Arrangement part, 75a ... Communication port, O6, O7 ... Screw hole 76 ... Board fixing part, H1, H2 ... Hook 80 ... Rear cover S1 to S7 ... Screw 5 ... Jig, 5a ... First installation part, 5b ... Second installation part, 5c ... Anti-rotation part

Claims

A head-up display device that emits display light representing an image toward a translucent member and displays the image as a virtual image.
A display unit that generates the display light and
A mirror unit having a mirror that reflects the display light generated by the display unit toward the translucent member, and a support unit that rotatably supports the mirror about a predetermined axis.
A case for accommodating the mirror unit on the front side is provided.
The case has a through hole at a position where the support portion is covered 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.
A drive unit for rotationally driving the mirror is provided.
As the support portion, there are a pair of first support portion and a second support portion located across the mirror in the direction in which the axis extends.
The drive unit 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 1.
A circuit board that is electrically connected to each of the display unit and the drive unit is provided.
The case has an accommodating portion for accommodating the mirror on the front side.
The circuit board is fixed to the back side of the housing portion in the case.
The head-up display device according to claim 2.
The case has an arrangement portion on which the display portion is arranged on the back side.
The disposition portion is provided with a communication port for communicating the back side and the front side of the case.
The display unit is fixed to the case from the back side and is disposed in the disposition portion, and emits the display light that reaches the mirror from the communication port toward the front side of the case.
The head-up display device according to any one of claims 1 to 3.