JP7521187B2 - Head-up display device - Google Patents

Description

This disclosure relates to a head-up display device.

For example, the head-up display device described in Patent Document 1 includes a liquid crystal display that emits display light, a plane mirror that reflects the display light emitted by the liquid crystal display, a concave mirror that displays a virtual image on the windshield or the like by reflecting the display light reflected by the plane mirror toward the windshield or the like, a motor that rotates the concave mirror to adjust the projection direction of the display light, and a housing that contains the liquid crystal display, the plane mirror, and the concave mirror.

JP 2010-113197 A

The inventors of the present application are considering a configuration in which a motor for rotating the concave mirror is provided outside the housing, and the driving force of the motor is transmitted to the concave mirror through a hole formed in the housing. However, with this configuration, dust can easily get into the optical path inside the housing through the hole in the housing, and there is a risk that the dust will degrade the display quality of the virtual image.

This disclosure was made in consideration of the above-mentioned circumstances, and aims to provide a head-up display device that can suppress deterioration of display quality.

In order to achieve the above object, the head-up display device according to the present disclosure is a head-up display device that displays a virtual image by projecting display light onto a projection member, and includes a display unit that emits the display light, a mirror that guides the display light from the display unit to the projection member, a mirror drive unit that rotates the mirror, a control board that controls at least one of the display unit and the mirror drive unit, a board shielding member that covers at least a portion of the control board, and a case that houses the mirror in an internal optical path space and has the mirror drive unit, the control board, and the board shielding member provided externally, and the case includes a light receiving portion that is used to transmit a force from the mirror drive unit to the mirror between the mirror drive unit and the mirror. a hole is formed, and the substrate shielding member has a hole facing portion formed at a position facing the hole, the hole facing portion having an opposing plate facing the hole and a side wall plate fixed to an edge of the opposing plate and extending in a direction intersecting the opposing plate; the mirror driving unit has a motor, a lead screw rotated about its axis by the motor, a holding portion that grasps a portion of the mirror and is fitted into the outer periphery of the lead screw and moves along the lead screw due to the axial rotation of the lead screw, thereby rotating the mirror; and a racket that supports the motor and the lead screw and is fixed to the case; the bracket has a plate portion, and a portion of the second side wall plate , which is the side wall plate, is formed so as to overlap only a portion of the plate portion in the thickness direction of the second side wall plate.

According to the present disclosure, it is possible to suppress deterioration of display quality in a head-up display device.

1 is a schematic diagram of a vehicle equipped with a head-up display device according to an embodiment of the present disclosure. 1 is a schematic cross-sectional view of a head-up display device according to an embodiment of the present disclosure. FIG. 2 is a perspective view of the bottom side of a head-up display device according to an embodiment of the present disclosure. 1 is a perspective view of a bottom side of a head-up display device from which a lower case has been removed according to an embodiment of the present disclosure. FIG. FIG. 5 is a perspective view of FIG. 4 seen from a different direction. 2 is an exploded perspective view of a first substrate shield member, a second substrate shield member, and a control substrate according to an embodiment of the present disclosure. FIG. 1 is a perspective view of a head-up display device from which a lower case and a first substrate shielding member have been removed according to an embodiment of the present disclosure. FIG. 1 is a perspective view of a head-up display device with an upper case removed according to an embodiment of the present disclosure. FIG. 1 is a perspective view of a head-up display device with an upper case and a concave mirror removed according to an embodiment of the present disclosure. FIG.

An embodiment of a head-up display device according to the present disclosure will be described with reference to the drawings. In the following description, the X direction corresponds to the vehicle width direction, the Y direction corresponds to the vehicle front-rear direction, and the Z direction corresponds to the vehicle height direction.
1, the head-up display device 100 is mounted in the dashboard of a vehicle 200. The head-up display device 100 emits display light L representing an image toward a windshield 201, which is an example of a projection target member of the vehicle 200. The display light L is reflected by the windshield 201 and reaches a viewer 1 (mainly the driver of the vehicle 200). As a result, the head-up display device 100 displays a virtual image V including vehicle information so as to be visible to the viewer 1.

As shown in FIG. 2, the head-up display device 100 includes a display unit 10, a reflector 20, a concave mirror 30, a mirror holding case 63, a housing 60, a control board 70, a first board shield member 80, and a second board shield member 90, and as shown in FIG. 5, a mirror drive unit 78.

As shown in FIG. 2, the display unit 10 includes a light emitting surface 12c that emits display light L representing an image under the control of a control board 70.
The display unit 10 comprises a display shield member 11, a display panel 12, a condenser lens 15, a first lenticular lens 13, a second lenticular lens 14, a light source substrate 16 on which a plurality of light sources 16a are mounted, a heat sink 17, a diffusion plate 19, and a light box 40.

Each light source 16a is composed of an LED (Light Emitting Diode) and is mounted on the mounting surface of the light source substrate 16 that faces the condenser lens 15. Each light source 16a emits light toward the condenser lens 15.

The heat sink 17 absorbs and dissipates heat from the light source board 16. The heat sink 17 is located on the back side of the light source board 16 on which the light source 16a is not mounted, and is exposed to the outside of the head-up display device 100 through an exposure hole 68a in the lower case 68, which will be described later.

The condenser lens 15 collimates the light from the light source 16a and radiates it toward the second lenticular lens 14.

The second lenticular lens 14 diffuses the light from the light source 16a that has passed through the condenser lens 15 in a first direction perpendicular to the optical axis direction, and then radiates the light to the first lenticular lens 13. This makes the light uniform in the first direction.
The first lenticular lens 13 diffuses the light from the light source 16a that has passed through the second lenticular lens 14 in the optical axis direction and in a second direction perpendicular to the first direction, and then radiates the light to the display panel 12. This makes the light uniform in the second direction.
The diffusion plate 19 diffuses the light that has passed through the first lenticular lens 13 and the second lenticular lens 14 and emits the diffused light to the display panel 12 .

The display panel 12 is a transmissive display, for example, a TFT (Thin Film Transistor) type liquid crystal display panel. The display panel 12 receives light from the light source 16 a via a diffusion plate 19 and emits display light L to a reflecting mirror 20.
The display panel 12 is not limited to a transmissive display, and may be a self-luminous display, for example, an organic electro-luminescence display (OELD).

The light box 40 is made of light-blocking resin and is formed into a cylindrical shape extending along the optical path from the light source 16a to the display panel 12. The internal space of the light box 40 houses a first lenticular lens 13, a second lenticular lens 14, and a condenser lens 15. The display panel 12 is provided at a first end of the light box 40 facing the reflector 20, and a light source board 16 is provided at a second end of the light box 40 opposite the first end.

As shown in FIG. 2, the reflector 20 is a plane mirror that reflects the display light L from the display unit 10 toward the concave mirror 30. The mirror holding case 63 is made of resin and holds the reflector 20 with the reflective surface of the reflector 20 exposed.

The concave mirror 30 reflects the display light L reflected by the reflector 20 toward the windshield 201 while magnifying it. The concave mirror 30 is supported by a mirror rotation support (not shown) so that it can rotate about a rotation axis Ax. The mirror rotation support (not shown) is a bearing member that is installed in the optical path space Sc of the middle case 62 (described later) and supports the shafts 32a and 32b (described later) of the concave mirror 30 so that they can rotate about the axis.

As shown in FIG. 8 , the concave mirror 30 includes a main body portion 31 , shaft portions 32 a and 32 b , and a lever portion 33 .
The main body 31 is curved concavely along the rotation axis Ax and has a rectangular plate shape that is long in the direction along the rotation axis Ax. The rotation axis Ax is along the Y direction. The surface of the main body 31 that faces the reflecting mirror 20 (see FIG. 2 ) is a reflective surface that reflects the display light L.
The shaft portions 32a, 32b are located at both ends of the main body portion 31 in the direction along the rotation axis Ax, and are provided on two side surfaces 31a, 31b extending in a direction perpendicular to the rotation axis Ax of the main body portion 31. The shaft portions 32a, 32b are each located on the rotation axis Ax and have a cylindrical shape extending along the rotation axis Ax.

As shown in FIG. 8, the lever portion 33 has a rectangular plate shape and is provided on the side surface 31a of the main body portion 31. The lever portion 33 is a part that is moved linearly by the mirror drive unit 78 when the concave mirror 30 is rotated around the rotation axis Ax. The lever portion 33 is gripped in the thickness direction of the lever portion 33 by a grip portion 78d (see FIG. 7) of the mirror drive unit 78, which will be described later, via a mirror drive hole 62b of the middle case 62, which will be described later.

7, the mirror driving unit 78 adjusts the projection position of the display light L in the Z direction by rotating the concave mirror 30 about the rotation axis Ax via the lever portion 33. The mirror driving unit 78 includes a motor 78a, a lead screw 78b, a bracket 78c, and a grip portion 78d.
The lead screw 78b extends along a direction perpendicular to the rotation axis Ax, for example, along the X direction.
The base end of the lead screw 78b is connected to the output shaft of the motor 78a, and the motor 78a rotates the lead screw 78b axially under the control of the control board 70.
The bracket 78c is a metal fitting that supports the lead screw 78b and the motor 78a, and is fixed to a drive unit installation portion 62c2 (described later) of the inner case 62. In detail, the bracket 78c includes a fixing portion 78c1, support plate portions 78c2 and 78c3, and a connecting plate portion 78c4.
The fixing portion 78c1 is plate-shaped and is fixed to a drive unit installation portion 62c2 (described later) of the inner case 62. The support plate portions 78c2, 78c3 are located at both ends of the lead screw 78b and each extend in a direction perpendicular to the lead screw 78b. The motor 78a is fixed to the outer surface of the support plate portion 78c2. The outer surface of the support plate portion 78c2 is the reverse side of the surface facing the support plate portion 78c3. The support plate portion 78c3 rotatably supports the tip of the lead screw 78b.
The connecting plate portion 78c4 extends along the lead screw 78b and connects the two support plates 78c2, 78c3. The connecting plate portion 78c4 extends in a direction perpendicular to the fixed portion 78c1 and is connected to the fixed portion 78c1.
The gripper 78d grips the lever portion 33 of the concave mirror 30 in the thickness direction of the lever portion 33 and is fitted onto the outer periphery of the lead screw 78b. The gripper 78d and the lead screw 78b are positioned in the Z direction to face a mirror drive hole 62b (described later). The gripper 78d moves along the axial direction of the lead screw 78b as the lead screw 78b rotates. As a result, the gripper 78d moves the lever portion 33 linearly along the X direction, causing the concave mirror 30 to rotate around the rotation axis Ax.

2, the housing 60 is made of a non-transparent resin or metal and has a hollow, substantially rectangular parallelepiped shape. The housing 60 houses each component of the head-up display device 100.
An opening 60a is formed in the housing 60 at a position facing the windshield 201 (see FIG. 1 ). The housing 60 includes a curved window panel 50 that closes the opening 60a. The window panel 50 is made of a translucent resin such as acrylic that transmits the display light L.

In more detail, as shown in FIG. 2, the housing 60 includes an upper case 61, a middle case 62, and a lower case 68.

2, the middle case 62 is box-shaped and opens upward. A mirror holding case 63 that holds the reflecting mirror 20 and the concave mirror 30 are housed in the optical path space Sc inside the middle case 62. A mirror drive unit 78, a display unit 10, a control board 70, a first board shield member 80, and a second board shield member 90 are fixed to a back surface 62c of the middle case 62.
As shown in Fig. 4, the rear surface 62c of the middle case 62 includes a board installation section 62c1 on which the control board 70, the first board shield member 80, and the second board shield member 90 are provided, and a drive unit installation section 62c2 on which the mirror drive unit 78 is provided. The board installation section 62c1 and the drive unit installation section 62c2 are aligned in the Y direction. The drive unit installation section 62c2 has an installation surface along the X direction and the Y direction. The board installation section 62c1 extends along the Y direction and has an installation surface that is inclined in the X direction. The installation surface of the board installation section 62c1 inclines toward the lower side of the head-up display device 100 (upper side in Fig. 4) as it moves away from the display unit 10.

As shown in Figures 2, 7 and 9, a light passing hole 62a and a mirror driving hole 62b are formed in the bottom surface of the optical path space Sc of the middle case 62. The light passing hole 62a is a through hole through which the display light L from the display unit 10 passes. The light exit surface 12c of the display unit 10 is provided in a position facing the light passing hole 62a of the middle case 62.

The grip 78d and lead screw 78b of the mirror drive unit 78 are provided in a position facing the mirror drive hole 62b of the middle case 62. The mirror drive hole 62b is used to transmit force from the mirror drive unit 78 to the concave mirror 30. The lever portion 33 of the concave mirror 30 passes through the mirror drive hole 62b.

As shown in Figures 3 and 5, connector holes 62e, 62f are formed in the middle case 62. The connector holes 62e, 62f are formed in a concave shape in a side wall of the middle case 62 facing the lower case 68. The connector holes 62e, 62f are aligned along the X direction. The connector hole 62e is formed so as to partially cover the upper part (lower part in Figure 3) around the first connector 71 described later. The connector hole 62f is formed so as to partially cover the upper part (lower part in Figure 3) around the second connector 72 described later.
5, a standing wall 62d is formed in the drive unit installation portion 62c2 of the middle case 62. The standing wall 62d has a rectangular plate shape extending along the Y direction and the Z direction. The standing wall 62d is located between a first connector 71 and a mirror drive unit 78, which will be described later.

As shown in FIG. 2, the lower case 68 is box-shaped and opens upward, and is attached to the lower part of the middle case 62 so as to cover the back surface 62c of the middle case 62 to which the first board shield member 80, the second board shield member 90, the control board 70, and the mirror drive unit 78 are fixed. The lower case 68 is formed with an exposure hole 68a, which is a through hole that exposes the heat sink 17 of the display unit 10 (described later) to the outside.

As shown in FIG. 3, connector holes 68e, 68f are formed in the lower case 68. The connector holes 68e, 68f are formed in a concave shape in the side wall of the lower case 68 facing the middle case 62. The connector holes 68e, 68f are aligned along the X direction. The connector hole 68f is formed so as to partially cover the lower part (upper part in FIG. 3) around the first connector 71 described later. The connector hole 68e is formed so as to partially cover the lower part (upper part in FIG. 3) around the second connector 72 described later.

As shown in FIG. 2, the control board 70 includes various electronic components including a control unit such as a CPU (Central Processing Unit) that controls the light source 16a, the display panel 12, and a motor 78a (see FIG. 5).
As shown in FIG. 6 , the control board 70 includes a board portion 76 , a first electronic component 73 a , a second electronic component 73 b , a first connector 71 , and a second connector 72 .
The board section 76 is a polygonal, plate-like printed circuit board that is long in the X direction.
A first electronic component 73a, a second electronic component 73b, a first connector 71, and a second connector 72 are provided on a mounting surface 76b of the substrate 76 facing the first substrate shield member 80. The substrate 76 includes a long portion 70a having a width W1, a short portion 70b having a width W2 shorter than the width W1, and an intermediate portion 70c located between the long portion 70a and the short portion 70b and having a width W3 that decreases as it approaches the short portion 70b from the long portion 70a. The widths W1, W2, and W3 are lengths along the short side of the substrate 76.
A first electronic component 73a is mounted on the long width portion 70a. The cutout portion 70d is located opposite a hole-facing portion 83 (described later) of the first substrate shield member 80 in the Z direction. A second electronic component 73b is mounted on the short width portion 70b. The height of the first electronic component 73a is set higher than the height of the second electronic component 73b. This height is based on the mounting surface 76b. As shown in FIG. 7, a cutout portion 70d is formed in a corner of the long width portion 70a close to the mirror drive unit 78.
6, a plurality of screw through holes 76a are formed in the edge of the base plate portion 76, penetrating in the thickness direction of the base plate portion 76. The shank of a screw 79 is inserted into each of the screw through holes 76a.

The first connector 71 and the second connector 72 are located at the end of the substrate 76, for example, at the end of the long width portion 70a opposite the short width portion 70b. The first connector 71 and the second connector 72 are aligned along the short side of the substrate 76 and positioned opposite the cutout portion 70d in the Y direction. The first connector 71 and the second connector 72 are connected to a signal line cable or a power line cable (not shown).

3, the first connector 71 is exposed to the outside of the head-up display device 100 while being surrounded by the connector hole 62f of the middle case 62 and the connector hole 68f of the lower case 68. Gaps are formed between the outer peripheral surface of the first connector 71 and the connector holes 62f, 68f. There is a concern that dust may enter the inside of the housing 60 through these gaps.
The second connector 72 is exposed to the outside of the head-up display device 100 while being surrounded by the connector hole 62e of the middle case 62 and the connector hole 68e of the lower case 68. A gap is formed between the outer peripheral surface of the second connector 72 and the connector holes 62e, 68e. There is a concern that dust may enter the inside of the housing 60 through this gap.

As shown in FIG. 6, the first board shielding member 80 and the second board shielding member 90 are made of metal and are positioned to sandwich the control board 70 in the thickness direction of the control board 70. The first board shielding member 80 and the second board shielding member 90 can block electromagnetic noise from mobile terminals such as smartphones and suppress adverse effects of electromagnetic noise on the control board 70. The first board shielding member 80 and the second board shielding member 90 are each formed, for example, by press processing.

6 , the second substrate shield member 90 includes a main body plate portion 91, a plurality of side wall portions 92, and a plurality of flange portions 93. The main body plate portion 91 has a polygonal plate shape that is elongated in the X direction. The main body plate portion 91 is positioned opposite to the rear surface of the mounting surface 76b of the substrate portion 76, and covers the rear surface of the substrate portion 76.
The side walls 92 are formed by bending the peripheral edge of the main body plate 91 towards the control board 70. The side walls 92 prevent dust or noise from entering the gap between the main body plate 91 and the rear surface of the board 76.
The plurality of flange portions 93 extend in a plate shape from the tip of any one of the plurality of side wall portions 92 in a direction away from the main body plate portion 91. Each flange portion 93 is in surface contact with the rear surface of the base plate portion 76. Each flange portion 93 is formed with a screw through hole 93a penetrating through the flange portion 93 in the thickness direction. The shank of the screw 79 is inserted into the screw through hole 93a.

As shown in FIG. 6 , the first substrate shield member 80 includes a first shield portion 81 , a second shield portion 82 , and a hole-facing portion 83 .
The first shield portion 81 is formed in a box shape that opens toward the substrate portion 76 so as to cover the longer width portion 70a of the substrate portion 76. The first shield portion 81 includes a main body plate portion 81a, a plurality of side wall portions 81b, and a plurality of flange portions 81c.

The main body plate portion 81a is in the shape of a polygonal plate that covers the wide portion 70a. The main body plate portion 81a faces the mounting surface 76b of the substrate portion 76.
The multiple sidewalls 81b are formed by bending the peripheral edge of the main body plate portion 81a toward the control board 70. The sidewalls 81b prevent dust or noise from entering the gap between the main body plate portion 81a and the mounting surface 76b.
The flanges 81c extend from the tip of one of the side walls 81b in a plate-like shape in a direction away from the main body plate 81a. Each flange 81c is in surface contact with the mounting surface 76b. Each flange 81c has a screw through hole 81d that penetrates the flange 81c in the thickness direction. The shank of the screw 79 is inserted into the screw through hole 81d.

The second shield portion 82 is formed in a box shape that opens toward the substrate portion 76 so as to cover the short width portion 70b and the middle portion 70c of the substrate portion 76. The second shield portion 82 includes a main body plate portion 82a, a plurality of side wall portions 82b, and a plurality of flange portions 82c.

The main body plate portion 82a has a polygonal plate shape that covers the short width portion 70b and the intermediate portion 70c. The main body plate portion 82a faces the mounting surface 76b of the board portion 76. The main body plate portion 82a is located closer to the mounting surface 76b than the main body plate portion 81a.
The multiple side wall portions 82b are formed by bending the peripheral portion of the main body plate portion 82a toward the control board 70. The side wall portions 82b prevent dust or noise from entering the gap between the main body plate portion 82a and the mounting surface 76b. The height of the side wall portions 82b in the Z direction is lower than the height of the side wall portions 81b in the Z direction.
The flanges 82c extend from the tip of any one of the side walls 82b in a plate-like shape in a direction away from the main body plate 82a. Each flange 82c is in surface contact with the mounting surface 76b. Each flange 82c has a screw through hole 82d that penetrates the flange 82c in the thickness direction. The shank of the screw 79 is inserted into the screw through hole 82d.

As shown in Figure 4, the hole opposing portion 83 is positioned to face the mirror driving hole 62b of the middle case 62 via the gripping portion 78d (see Figure 7) of the mirror driving unit 78, and prevents dust from entering the optical path space Sc via the mirror driving hole 62b of the middle case 62, and prevents electromagnetic noise emitted by the mirror driving unit 78 from spreading inside and outside the head-up display device 100.
As shown in FIG. 6, the hole facing portion 83 is located on the opposite side of the first shield portion 81 from the second shield portion 82 in the Y direction, and is aligned with the first connector 71 and the second connector 72 in the X direction.

As shown in FIG. 6, the hole facing portion 83 includes a facing plate 83a and side wall plates 83b, 83c, and 83d.
The opposing plate 83a has a rectangular plate shape and extends along the mounting surface 76b of the substrate portion 76. A first side portion of the opposing plate 83a that is closer to the first shield portion 81 is connected to a tip of the side wall portion 81b of the first shield portion 81. The opposing plate 83a is provided at a position closer to the mirror driving hole 62b of the middle case 62 in the Z direction than the main body plate portion 81a.
5, the facing plate 83a is a long rectangular plate extending along the lead screw 78b of the mirror drive unit 78. The facing plate 83a is positioned in the Z direction opposite the mirror drive hole 62b of the middle case 62 via the lead screw 78b. The facing plate 83a is inclined in a direction away from the mirror drive hole 62b as it approaches the motor 78a.

As shown in FIGS. 5 and 6, the side wall plates 83b and 83c extend from the edge of the opposing plate 83a toward the mirror driving hole 62b in a direction intersecting with the opposing plate 83a.
The side wall plate 83b is connected to the second side portion of the opposing plate 83a far from the first shield portion 81, and extends in a direction perpendicular to the opposing plate 83a. As shown in FIG. 5, a part of the side wall plate 83b is formed so as to overlap a part of the connecting plate portion 78c4 in the thickness direction (Y direction) of the side wall plate 83b. The side wall plate 83b is located outside the connecting plate portion 78c4 in the Y direction. A gap may be formed between the side wall plate 83b and the connecting plate portion 78c4, or the side wall plate 83b and the connecting plate portion 78c4 may be in contact with each other. In this way, the side wall plate 83b and the connecting plate portion 78c4 overlap each other, so that the intrusion path of dust into the mirror driving hole 62b can be made complex, and the intrusion of dust into the mirror driving hole 62b can be suppressed.

5 and 6, the side wall plate 83c is connected to the third side of the facing plate 83a close to the first connector 71 and extends in a direction intersecting with the facing plate 83a so as to follow the standing wall portion 62d. The side wall plate 83c extends in the Y direction and the Z direction so as to form an obtuse angle with the facing plate 83a. As shown in FIG. 5, a part of the side wall plate 83c is formed so as to overlap a part of the standing wall portion 62d in the thickness direction (X direction) of the side wall plate 83c. The side wall plate 83c is provided at a position closer to the mirror drive unit 78 than the standing wall portion 62d in the X direction. A gap may be formed between the side wall plate 83c and the standing wall portion 62d, or the side wall plate 83c and the standing wall portion 62d may be in contact with each other. In this way, by overlapping the side wall plate 83c and the standing wall portion 62d, the path of entry of dust into the mirror drive hole 62b can be made complex, and the intrusion of dust into the mirror drive hole 62b can be suppressed.

The side wall plate 83d is connected to the fourth side of the opposing plate 83a that is farthest from the first connector 71, and extends in a direction perpendicular to the opposing plate 83a. The side wall plate 83d extends in a direction away from the mirror drive hole 62b. In other words, the side wall plate 83d extends toward the opposite side to the side wall plates 83b and 83c. The side wall plate 83d prevents dust located on the back side of the surface of the opposing plate 83a that faces the mirror drive hole 62b from moving toward the mirror drive hole 62b.

Next, a method of attaching the control board 70, the first board shield member 80, and the second board shield member 90 to the board installation portion 62c1 of the middle case 62 will be described.
4 and 6, the shanks of the screws 79 are inserted through the screw through-holes 81d, 82d of the first board shield member 80, the screw through-hole 76a of the control board 70, and the screw through-hole 93a of the second board shield member 90. Then, the tips of the shanks of the screws 79 are screwed into screw holes (not shown) of the board installation portion 62c1 of the middle case 62. In this way, the control board 70, the first board shield member 80, and the second board shield member 90 are fixed to the board installation portion 62c1 of the middle case 62.

As shown in Fig. 3, dust has entered the inside of the lower case 68 through the gap between the outer circumferential surface of the first connector 71 and the connector holes 62f, 68f. In this case, even if the dust heads toward the mirror drive hole 62b of the middle case 62, the opposing plate 83a prevents the dust from moving toward the mirror drive hole 62b, as shown by the path R1 in Fig. 4. The dust located on the opposing plate 83a is prevented from moving toward the mirror drive hole 62b by the side wall plate 83d. In addition, even if the dust located on the opposing plate 83a moves along the side wall plate 83c, the side wall plate 83c and the standing wall portion 62d are formed to overlap, so that the dust can be prevented from entering the mirror drive hole 62b through the gap between the side wall plate 83c and the standing wall portion 62d. Furthermore, even if dust located on the opposing plate 83a moves along the side wall plate 83b, the side wall plate 83b and the connecting plate portion 78c4 are formed so as to overlap, so that the intrusion of dust into the mirror driving hole 62b through the gap between the side wall plate 83b and the connecting plate portion 78c4 can be prevented.
Furthermore, the cause of dust entering the interior of the lower case 68 is not limited to the gap between the first connector 71 and the second connector 72 and the housing 60, but may also be, for example, the gap between the lower case 68 and the middle case 62 or the gap between the exposure hole 68a of the lower case 68 and the heat sink 17.

(effect)
According to the embodiment described above, the following effects are achieved.
(1) The head-up display device 100 displays a virtual image V by projecting display light L onto a windshield 201, which is an example of a projection target member. The head-up display device 100 includes a display unit 10 that emits the display light L, a concave mirror 30 that is an example of a mirror that guides the display light L from the display unit 10 to the windshield 201, a mirror drive unit 78 that rotates the concave mirror 30, a control board 70 that controls the display unit 10 and the mirror drive unit 78, a first board shield member 80 that is an example of a board shield member that covers a mounting surface 76b of the control board 70, and an intermediate case 62 that is an example of a case that houses the concave mirror 30 in an internal optical path space Sc and has the mirror drive unit 78, the control board 70, and the first board shield member 80 provided on the outside. A mirror drive hole 62b that is an example of a hole used to transmit a force from the mirror drive unit 78 to the concave mirror 30 is formed in the intermediate case 62 between the mirror drive unit 78 and the concave mirror 30. The first substrate shield member 80 includes a hole facing portion 83 formed at a position facing the mirror driving hole 62b.
According to this configuration, the hole facing portion 83 prevents dust from entering the optical path space Sc of the inner case 62, and deterioration of the display quality of the virtual image V is suppressed.
In addition, the hole facing portion 83 prevents electromagnetic noise generated by the mirror drive unit 78 from spreading inside and outside the head-up display device 100 .

(2) The hole facing portion 83 includes a facing plate 83a facing the mirror drive hole 62b, and side wall plates 83b, 83c, and 83d fixed to the edge of the facing plate 83a and extending in a direction intersecting the facing plate 83a.
According to this configuration, the side walls 83b, 83c, and 83d prevent dust from being directed toward the mirror drive hole 62b.

(3) The middle case 62 includes the upright wall portion 62d that is formed so as to overlap at least a portion of the side wall plate 83c, which is an example of a first side wall plate, in the thickness direction of the side wall plate 83c.
According to this configuration, the side wall panel 83c and the standing wall portion 62d overlap, thereby complicating the path of dust entering the mirror driving hole 62b through the gap between the side wall panel 83c and the standing wall portion 62d, thereby suppressing the entry of dust into the mirror driving hole 62b.

(4) The mirror drive unit 78 includes a motor 78a, a lead screw 78b that is axially rotated by the motor 78a, a gripper 78d that grips the lever portion 33 that is a part of the concave mirror 30, is fitted onto the outer periphery of the lead screw 78b, and moves along the lead screw 78b by the axial rotation of the lead screw 78b, thereby rotating the concave mirror 30, and a bracket 78c that supports the motor 78a and the lead screw 78b and is fixed to the drive unit installation portion 62c2 of the middle case 62. The bracket 78c includes a connecting plate portion 78c4 that is an example of a plate portion that is formed so that at least a portion of a side wall plate 83b that is an example of a second side wall plate overlaps with the side wall plate 83b in the thickness direction.
According to this configuration, the side wall plate 83b and the connecting plate portion 78c4 overlap, thereby complicating the path of dust entering the mirror driving hole 62b through the gap between the side wall plate 83b and the connecting plate portion 78c4, thereby preventing dust from entering the mirror driving hole 62b.

Note that this disclosure is not limited to the above-described embodiments and drawings. Modifications (including the deletion of components) may be made as appropriate within the scope of the present disclosure without changing its gist. An example of a modification is described below.

(Modification)
At least one of the three side wall plates 83b, 83c, 83d of the hole facing portion 83 in the above embodiment may be omitted.

The configuration of the mirror drive unit 78 in the above embodiment can be modified as appropriate. For example, the mirror drive unit 78 may rotate the concave mirror 30 using a gear rotated by a motor.

The reflecting mirror 20 in the above embodiment is not limited to a plane mirror, but may be a concave mirror.
In addition, the reflecting mirror 20 may be omitted, and the display light L from the display unit 10 may be directly irradiated onto the concave mirror 30 .

The second substrate shield member 90 in the above embodiment may be omitted.
Moreover, the hole facing portion 83 of the first substrate shield member 80 in the above embodiment may be omitted, and the hole facing portion 83 may be provided on the second substrate shield member 90 .

In the above embodiment, the side wall plate 83c is provided at a position closer to the mirror drive unit 78 than the standing wall portion 62d in the X direction, but this is not limited thereto, and the side wall plate 83c may be provided at a position closer to the first connector 71 than the standing wall portion 62d in the X direction. Also, two standing walls 62d may be provided so as to sandwich the side wall plate 83c from the thickness direction of the side wall plate 83c. Furthermore, the standing wall portion 62d may be omitted.
Further, although the side wall plate 83b is located outward from the connecting plate portion 78c4 in the Y direction, it may be located inward from the connecting plate portion 78c4.

In the above embodiment, the head-up display device 100 is mounted on the vehicle 200, but it may be mounted on a vehicle other than the vehicle 200, such as an airplane or a ship. In addition, the projection member is not limited to the windshield, and may be a dedicated combiner.

1 Viewer 10 Display unit 11 Display shield member 12 Display panel 13 First lenticular lens 14 Second lenticular lens 15 Condenser lens 16 Light source board 16a Light source 17 Heat sink 19 Diffuser 20 Reflector 30 Concave mirror 31 Main body 31a, 31b Side 32a, 32b Shaft 33 Lever 40 Light box 50 Window plate 60 Housing 61 Upper case 62 Middle case 62a Light passage hole 62b Mirror drive hole 62c Back surface 62c1 Board installation portion 62c2 Drive unit installation portion 62d Standing wall portion 62e, 62f, 68e, 68f Connector hole 63 Mirror holding case 68 Lower case 68a Exposure hole 70 Control board 70a Long width portion 70b Short width portion 70c Middle portion 71 First connector 72 Second connector 73a First electronic component 73b Second electronic component 76 Substrate portion 76a, 81d, 82d, 93a Screw through hole 76b Mounting surface 78 Mirror drive unit 78a Motor 78b Lead screw 78c Bracket 78d Grip portion 78c1 Fixing portion 78c2, 78c3 Support plate portion 78c4 Connecting plate portion 79 Screw 80 First substrate shield member 81 First shield portion 81a, 82a, 91 Main body plate portion 81b, 82b, 92 Side wall portion 81c, 82c, 93 Flange portion 82 Second shield portion 83 Hole opposing portion 83a Opposing plate 83b, 83c, 83d Side wall plate 90 Second substrate shield member 100 Head-up display device 200 Vehicle 201 Windshield L Display light V Virtual image Sc Optical path space Ax Rotation axis

Claims (2)

A head-up display device that displays a virtual image by projecting display light onto a projection member,
A display unit that emits the display light;
a mirror that guides the display light from the display unit to the projection member;
a mirror drive unit that rotates the mirror;
a control board that controls at least one of the display unit and the mirror driving unit;
a board shield member covering at least a portion of the control board;
a case that houses the mirror in an internal optical path space and has the mirror drive unit, the control board, and the board shield member provided externally;
a hole is formed in the case between the mirror drive unit and the mirror, the hole being used to transmit a force from the mirror drive unit to the mirror;
the board shield member includes a hole-facing portion formed at a position facing the hole ,
The hole facing portion is
An opposing plate facing the hole;
A side wall plate is fixed to an edge portion of the facing plate and extends in a direction intersecting the facing plate,
The mirror drive unit includes:
A motor;
A lead screw whose axis is rotated by the motor;
a gripping portion that grips a part of the mirror, is fitted around an outer periphery of the lead screw, and moves along the lead screw in response to axial rotation of the lead screw, thereby rotating the mirror;
a bracket supporting the motor and the lead screw and fixed to the case;
The bracket includes a plate portion,
A portion of the second side wall plate , which is the side wall plate, is formed so as to overlap only a portion of the plate portion in a thickness direction of the second side wall plate .
Head-up display device. The case includes a standing wall portion formed so as to overlap a part of a first side wall plate, which is the side wall plate, in a thickness direction of the first side wall plate.
The head-up display device according to claim 1 .