JP2021107164A - Head-up display device - Google Patents

Abstract

To provide a head-up display device capable of suppressing reduction of display quality.SOLUTION: This head-up display device comprises: a display unit that emits display light; a concave mirror that guides the display light from the display unit to a front glass; a mirror drive unit 78 that rotates the concave mirror; a control board 70 that controls the display unit and the mirror drive unit 78; a first substrate shield member 80 that covers the mounting surface of the control board 70; and an inner case 62 that houses the concave mirror in an internal optical path space and has the mirror drive unit 78, the control board 70, and the first substrate shield member 80 provided outside. In the inner case 62, a mirror drive hole 62b used for transmitting a force from the mirror drive unit 78 to the concave mirror is formed between the mirror drive unit 78 and the concave mirror. The first shield member 80 comprises a hole counter part 83 formed at a position opposite to the mirror drive hole 62b.SELECTED DRAWING: Figure 5

Description

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

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

Japanese Unexamined Patent Publication No. 2010-13197

The inventors of the present application are studying a configuration in which a motor for rotating a 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, in this configuration, dust easily enters the optical path inside the housing through the hole in the housing, and the dust may deteriorate the display quality of the virtual image.

The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a head-up display device capable of suppressing 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 projected member, and includes a display unit that emits the display light. A mirror that guides the display light from the display unit to the projected 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, and the control board. The case includes a substrate shield member that covers at least a part of the mirror, and a case in which the mirror is housed in an internal optical path space and the mirror drive unit, the control substrate, and the substrate shield member are provided outside. A hole used for transmitting a force from the mirror drive unit to the mirror is formed between the mirror drive unit and the mirror, and the substrate shield member is formed at a position facing the hole. A hole facing portion is provided.

According to the present disclosure, in a head-up display device, deterioration of display quality can be suppressed.

It is the schematic of the vehicle which mounted the head-up display device which concerns on one Embodiment of this disclosure. It is a schematic cross-sectional view of the head-up display device which concerns on one Embodiment of this disclosure. It is a perspective view of the bottom surface side of the head-up display device which concerns on one Embodiment of this disclosure. It is a perspective view of the bottom surface side of the head-up display device from which the lower case which concerns on one Embodiment of this disclosure was removed. FIG. 4 is a perspective view of FIG. 4 viewed from different directions. It is an exploded perspective view of the 1st substrate shield member, the 2nd substrate shield member and the control substrate which concerns on one Embodiment of this disclosure. It is a perspective view of the head-up display device which removed the lower case and the 1st substrate shield member which concerns on one Embodiment of this disclosure. It is a perspective view of the head-up display device which removed the upper case which concerns on one Embodiment of this disclosure. It is a perspective view of the head-up display device which removed the upper case and the concave mirror which concerns on one Embodiment of this disclosure.

An embodiment of the head-up display device according to the present disclosure will be described with reference to the drawings. In the following, the X direction is along the vehicle width direction, the Y direction is along the vehicle front-rear direction, and the Z direction is along the height direction.
As shown in FIG. 1, the head-up display device 100 is mounted in the dashboard of the vehicle 200. The head-up display device 100 emits display light L representing an image toward the windshield 201, which is an example of the projected member of the vehicle 200. The display light L is reflected by the windshield 201 and reaches the viewer 1 (mainly the driver of the vehicle 200). As a result, the head-up display device 100 displays the virtual image V including the 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, and a first board shield member 80. A second substrate shield member 90 and a mirror drive unit 78 are provided as shown in FIG.

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 the control board 70.
The display unit 10 includes 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, and a heat sink 17. A diffuser plate 19 and a light box 40 are provided.

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

The heat sink 17 absorbs and dissipates the heat of the light source substrate 16. The heat sink 17 is located on the back surface of the light source substrate 16 on which the light source 16a is not mounted, and is exposed to the outside of the head-up display device 100 through the exposed holes 68a of the lower case 68 described later.

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

The second lenticular lens 14 diffuses the light passing through the condenser lens 15 in the first direction orthogonal to the optical axis direction and then radiates the light from the light source 16a to the first wrenchular lens 13. As a result, the light is made uniform in the first direction.
The first lenticular lens 13 diffuses the light that has passed through the second lenticular lens 14 from the light source 16a in the second direction orthogonal to the optical axis direction and the first direction, and then radiates the light to the display panel 12. This makes the light uniform in the second direction.
The diffuser plate 19 diffuses the light that has passed through the first lenticular lens 13 and the second lenticular lens 14 and then emits the 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 the light from the light source 16a that has passed through the diffuser plate 19 and emits the display light L to the reflector 20.
The display panel 12 is not limited to the transmissive display, and may be a self-luminous display, for example, an organic EL display (OELD: Organic Electro-Luminescence Display).

The light box 40 is formed of a light-shielding resin in a tubular shape extending along an optical path from the light source 16a to the display panel 12. The first lenticular lens 13, the second lenticular lens 14, and the condenser lens 15 are housed in the internal space of the light box 40. A display panel 12 is provided at the first end of the light box 40 facing the reflector 20, and a light source substrate 16 is provided at the second end of the light box 40 opposite to the first end.

As shown in FIG. 2, the reflecting mirror 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 reflecting mirror 20 in a state where the reflecting surface of the reflecting mirror 20 is exposed.

The concave mirror 30 reflects the display light L reflected by the reflector 20 while enlarging it toward the windshield 201. The concave mirror 30 is rotatably supported around the rotation axis Ax by a mirror rotation support portion (not shown). The mirror rotation support portion (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 shaft portions 32a and 32b of the concave mirror 30 described later in an axially rotatable manner.

As shown in FIG. 8, the concave mirror 30 includes a main body portion 31, shaft portions 32a and 32b, and a lever portion 33.
The main body 31 is concavely curved along the rotation axis Ax, and forms a long rectangular plate in the direction along the rotation axis Ax. The rotation axis Ax is along the Y direction. The surface of the main body 31 facing the reflecting mirror 20 (see FIG. 2) is a reflecting surface that reflects the display light L.
The shaft portions 32a and 32b are located at both ends of the main body portion 31 in the direction along the rotation axis Ax, and are provided on each of the two side surfaces 31a and 31b extending in the direction orthogonal to the rotation axis Ax in the main body portion 31. The shaft portions 32a and 32b are respectively located on the rotation axis Ax and form a columnar 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 portion that is linearly moved by the mirror drive unit 78 when the concave mirror 30 is rotated about the rotation axis Ax. The lever portion 33 is gripped by the later-described grip portion 78d (see FIG. 7) of the mirror drive unit 78 from the thickness direction of the lever portion 33 via the mirror drive hole 62b of the inner case 62 described later.

As shown in FIG. 7, the mirror drive unit 78 adjusts the projection position of the display light L in the Z direction by rotating the concave mirror 30 around the rotation axis Ax via the lever portion 33. The mirror drive 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 orthogonal to the rotation axis Ax, for example, the X direction.
In the motor 78a, the base end of the lead screw 78b is connected to the output shaft of the motor 78a, and the lead screw 78b is rotated 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 the drive unit installation portion 62c2 described later in the middle case 62. Specifically, the bracket 78c includes a fixing portion 78c1, a support plate portion 78c2, 78c3, and a connecting plate portion 78c4.
The fixing portion 78c1 has a plate shape and is fixed to the drive unit installation portion 62c2 described later in the middle case 62. The support plate portions 78c2 and 78c3 are located at both ends of the lead screw 78b and extend in a direction orthogonal to the lead screw 78b, respectively. A 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 back surface 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 supporting plate portions 78c2 and 78c3. The connecting plate portion 78c4 extends in a direction orthogonal to the fixing portion 78c1 and is connected to the fixing portion 78c1.
The grip portion 78d grips the lever portion 33 of the concave mirror 30 from the thickness direction of the lever portion 33 and is fitted on the outer circumference of the lead screw 78b. The grip portion 78d and the lead screw 78b are located in the Z direction so as to face the mirror driving hole 62b described later. The grip portion 78d moves along the axial direction of the lead screw 78b due to the axial rotation of the lead screw 78b. As a result, the grip portion 78d linearly moves the lever portion 33 along the X direction to rotate the concave mirror 30 around the rotation axis Ax.

As shown in FIG. 2, the housing 60 is made of a non-transmissive resin or metal and forms a hollow rectangular parallelepiped. Each configuration of the head-up display device 100 is housed in the housing 60.
The housing 60 is formed with an opening 60a at a position facing the windshield 201 (see FIG. 1). The housing 60 includes a curved plate-shaped window plate material 50 that closes the opening 60a. The window plate material 50 is made of a translucent resin such as acrylic through which the display light L is transmitted.

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

As shown in FIG. 2, the inner case 62 has a box shape that opens upward. A mirror holding case 63 for holding the reflecting mirror 20 and a concave mirror 30 are housed in the optical path space Sc in 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 the back surface 62c of the inner case 62.
As shown in FIG. 4, the back surface 62c of the inner case 62 is a drive unit provided with a control board 70, a board installation portion 62c1 on which the first board shield member 80 and the second board shield member 90 are provided, and a mirror drive unit 78. An installation unit 62c2 is provided. The board mounting portion 62c1 and the drive unit mounting portion 62c2 are arranged in the Y direction. The drive unit installation unit 62c2 has installation surfaces along the X and Y directions. The substrate mounting portion 62c1 has an mounting surface that extends along the Y direction and is inclined in the X direction. The installation surface of the substrate installation portion 62c1 is inclined toward the lower side (upper side in FIG. 4) of the head-up display device 100 as the distance from the display unit 10 increases.

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

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

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

As shown in FIG. 2, the lower case 68 has a box shape that opens upward, and is a middle case in which the first substrate shield member 80, the second substrate shield member 90, the control substrate 70, and the mirror drive unit 78 are fixed. It is attached to the lower part of the inner case 62 so as to cover the back surface 62c of the 62. The lower case 68 is formed with an exposed hole 68a which is a through hole for exposing the heat sink 17 described later of the display unit 10 to the outside.

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

As shown in FIG. 2, the control board 70 includes various electronic components including a control unit such as a light source 16a, a display panel 12, and a CPU (Central Processing Unit) that controls a motor 78a (see FIG. 5).
As shown in FIG. 6, the control board 70 includes a board portion 76, a first electronic component 73a, a second electronic component 73b, a first connector 71, and a second connector 72.
The substrate portion 76 is a polygonal plate-shaped 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 the mounting surface 76b of the board portion 76 facing the first board shield member 80. The substrate portion 76 is located between the width length portion 70a having the width W1, the width short portion 70b having the width W2 shorter than the width W1, and the width length portion 70a and the width short portion 70b, and has a width from the width length portion 70a. It includes an intermediate portion 70c in which the width W3 becomes smaller as it approaches the short portion 70b. The widths W1, W2, and W3 are lengths along the lateral direction of the substrate portion 76.
The first electronic component 73a is mounted on the wide and long portion 70a. The cutout portion 70d is located in the Z direction so as to face the hole facing portion 83 of the first substrate shield member 80, which will be described later. The 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 a height based on the mounting surface 76b. As shown in FIG. 7, a notch 70d is formed at a corner of the width 70a near the mirror drive unit 78.
As shown in FIG. 6, a plurality of screw through holes 76a penetrating in the thickness direction of the substrate portion 76 are formed at the edge portion of the substrate portion 76. The shaft portion of the screw 79 is inserted into each screw through hole 76a.

The first connector 71 and the second connector 72 are located at an end portion of the substrate portion 76, for example, an end portion of the width length portion 70a opposite to the width short portion 70b. The first connector 71 and the second connector 72 are arranged along the lateral direction of the substrate portion 76, and are located so as to face the notch portion 70d in the Y direction. A signal line cable or a power line cable (not shown) is connected to the first connector 71 and the second connector 72.

As shown in FIG. 3, the first connector 71 is exposed to the outside of the head-up display device 100 in a state of being surrounded by the connector hole 62f of the inner case 62 and the connector hole 68f of the lower case 68. A gap is formed between the outer peripheral surface of the first connector 71 and the connector holes 62f and 68f. There is a concern that dust may enter the inside of the housing 60 through this gap.
The second connector 72 is exposed to the outside of the head-up display device 100 in a state of being surrounded by the connector hole 62e of the inner 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 and 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 substrate shield member 80 and the second substrate shield member 90 have a metal plate shape, and are positioned so as to sandwich the control substrate 70 from the thickness direction of the control substrate 70. The first substrate shield member 80 and the second substrate shield member 90 can block electromagnetic wave noise from a mobile terminal such as a smartphone and suppress an adverse effect on the control board 70 due to the electromagnetic wave noise. The first substrate shield member 80 and the second substrate shield member 90 are each formed by, for example, press working.

As shown in FIG. 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 long in the X direction. The main body plate portion 91 is located so as to face the back surface of the mounting surface 76b of the substrate portion 76 and covers the back surface of the substrate portion 76.
The plurality of side wall portions 92 are formed by bending the peripheral edge portion of the main body plate portion 91 toward the control board 70. The side wall portion 92 suppresses dust or noise from entering the gap between the back surface of the main body plate portion 91 and the substrate portion 76.
The plurality of flange portions 93 extend in a plate shape at the tip of any of the plurality of side wall portions 92 in a direction away from the main body plate portion 91. Each flange portion 93 comes into surface contact with the back surface of the substrate portion 76. Each flange portion 93 is formed with a screw through hole 93a that penetrates in the thickness direction of the flange portion 93. The shaft portion 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 width and length 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 has a polygonal plate shape that covers the width and length portion 70a. The main body plate portion 81a faces the mounting surface 76b of the substrate portion 76.
The plurality of side wall portions 81b are formed by bending the peripheral edge portion of the main body plate portion 81a toward the control substrate 70. The side wall portion 81b suppresses dust or noise from entering the gap between the main body plate portion 81a and the mounting surface 76b.
The plurality of flange portions 81c extend in a plate shape at the tip of any of the plurality of side wall portions 81b in a direction away from the main body plate portion 81a. Each flange portion 81c comes into surface contact with the mounting surface 76b. Each flange portion 81c is formed with a screw through hole 81d that penetrates the flange portion 81c in the thickness direction. The shaft portion 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 width short portion 70b and the intermediate 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 substrate portion 76. The main body plate portion 82a is located closer to the mounting surface 76b than the main body plate portion 81a.
The plurality of side wall portions 82b are formed by bending the peripheral edge portion of the main body plate portion 82a toward the control substrate 70. The side wall portion 82b suppresses 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 portion 82b in the Z direction is lower than the height of the side wall portion 81b in the Z direction.
The plurality of flange portions 82c extend in a plate shape at the tip of any of the plurality of side wall portions 82b in a direction away from the main body plate portion 82a. Each flange portion 82c comes into surface contact with the mounting surface 76b. Each flange portion 82c is formed with a screw through hole 82d that penetrates the flange portion 82c in the thickness direction. The shaft portion of the screw 79 is inserted into the screw through hole 82d.

As shown in FIG. 4, the hole facing portion 83 is located so as to face the mirror driving hole 62b of the middle case 62 via the grip portion 78d (see FIG. 7) of the mirror driving unit 78, and is located in the middle case 62. It suppresses the invasion of dust into the optical path space Sc through the mirror driving hole 62b, and suppresses the electromagnetic noise generated 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 side opposite to the second shield portion 82 with respect to the first shield portion 81 in the Y direction, and is aligned with the first connector 71 and the second connector 72 in the X direction. Positioned as.

As shown in FIG. 6, the hole facing portion 83 includes a facing plate 83a and side wall plates 83b, 83c, 83d.
The facing plate 83a has a rectangular plate shape and extends along the mounting surface 76b of the substrate portion 76. The first side portion of the facing plate 83a near the first shield portion 81 is connected to the tip of the side wall portion 81b of the first shield portion 81. The facing plate 83a is provided at a position closer to the mirror driving hole 62b of the middle case 62 than the main body plate portion 81a in the Z direction.
As shown in FIG. 5, the facing plate 83a forms a long rectangular plate along the lead screw 78b of the mirror drive unit 78. The facing plate 83a is located in the Z direction via the lead screw 78b so as to face the mirror driving hole 62b of the middle case 62. The facing plate 83a is inclined in a direction away from the mirror driving 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 facing plate 83a toward the mirror driving hole 62b in the direction intersecting the facing plate 83a.
The side wall plate 83b is connected to a second side portion of the facing plate 83a far from the first shield portion 81, and extends in a direction orthogonal to the facing 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. By overlapping the side wall plate 83b and the connecting plate portion 78c4 in this way, it is possible to complicate the entry path of dust into the mirror driving hole 62b, and it is possible to suppress the intrusion of dust into the mirror driving hole 62b.

As shown in FIGS. 5 and 6, the side wall plate 83c is connected to the third side portion of the facing plate 83a near the first connector 71, and extends in the direction intersecting the facing plate 83a along the erection wall portion 62d. .. The side wall plate 83c extends along the Y direction and the Z direction so as to form an obtuse angle with respect to 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 erection 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 erection wall portion 62d, or the side wall plate 83c and the erection wall portion 62d may be in contact with each other. By overlapping the side wall plate 83c and the erection wall portion 62d in this way, it is possible to complicate the entry path of dust into the mirror driving hole 62b, and it is possible to suppress the intrusion of dust into the mirror driving hole 62b. ..

The side wall plate 83d is connected to a fourth side portion of the facing plate 83a far from the first connector 71, and extends in a direction orthogonal to the facing plate 83a. The side wall plate 83d extends in a direction away from the mirror driving hole 62b. That is, the side wall plate 83d extends toward the side opposite to the side wall plates 83b and 83c. The side wall plate 83d suppresses dust located on the back surface of the surface of the facing plate 83a facing the mirror driving hole 62b from moving toward the mirror driving 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 mounting portion 62c1 of the middle case 62 will be described.
As shown in FIGS. 4 and 6, the shaft portion of each screw 79 is a screw through hole 81d, 82d of the first substrate shield member 80, a screw through hole 76a of the control board 70, and a screw of the second substrate shield member 90. It is inserted through the through hole 93a. Then, the tip of the shaft portion of the screw 79 is screwed into the screw hole (not shown) of the substrate mounting portion 62c1 of the middle case 62. As a result, 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 inner case 62.

As shown in FIG. 3, it is assumed that dust has entered the inside of the lower case 68 through the gap between the outer peripheral surface of the first connector 71 and the connector holes 62f and 68f. In this case, as shown in the path R1 of FIG. 4, even if the dust is directed to the mirror driving hole 62b of the inner case 62, the facing plate 83a suppresses the dust toward the mirror driving hole 62b. Dust located on the facing plate 83a is suppressed from going toward the mirror driving hole 62b by the side wall plate 83d. Further, even if the dust located on the facing plate 83a moves along the side wall plate 83c, the side wall plate 83c and the standing wall portion 62d are formed so as to overlap each other, so that the gap between the side wall plate 83c and the standing wall portion 62d is formed. It is possible to suppress the intrusion of dust into the mirror driving hole 62b through the mirror. Further, even if the dust located on the facing 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 each other. It is possible to suppress the intrusion of dust into the mirror driving hole 62b.
The cause of dust entering the inside 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, for example, the gap between the lower case 68 and the middle case 62 or the lower case. It may be a gap between the exposed hole 68a of 68 and the heat sink 17.

(effect)
According to the above-described embodiment, the following effects are obtained.
(1) The head-up display device 100 displays the virtual image V by projecting the display light L onto the windshield 201, which is an example of the projected member. The head-up display device 100 includes a display unit 10 that emits 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 front glass 201, and a mirror drive unit 78 that rotates the concave mirror 30. The control board 70 that controls the display unit 10 and the mirror drive unit 78, the first board shield member 80 that is an example of the board shield member that covers the mounting surface 76b of the control board 70, and the concave mirror 30 are included in the optical path space Sc. A middle case 62, which is an example of a case in which a mirror drive unit 78, a control board 70, and a first board shield member 80 are provided outside, is provided. In the middle case 62, a mirror drive hole 62b, which is an example of a hole used for transmitting force from the mirror drive unit 78 to the concave mirror 30, is formed 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 suppresses dust from entering the optical path space Sc of the middle case 62, and the deterioration of the display quality of the virtual image V is suppressed.
Further, the hole facing portion 83 suppresses the 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 driving hole 62b and side wall plates 83b, 83c, 83d fixed to the edge of the facing plate 83a and extending in a direction intersecting the facing plate 83a. Be prepared.
According to this configuration, the side wall plates 83b, 83c, 83d prevent dust from heading toward the mirror driving hole 62b.

(3) The middle case 62 includes an upright wall portion 62d formed so that at least a part of the side wall plate 83c, which is an example of the first side wall plate, overlaps in the thickness direction of the side wall plate 83c.
According to this configuration, the side wall plate 83c and the erection wall portion 62d overlap each other, which complicates the entry path of dust into the mirror driving hole 62b through the gap between the side wall plate 83c and the erection wall portion 62d. It is possible to suppress the intrusion of dust into the mirror driving hole 62b.

(4) The mirror drive unit 78 grips the motor 78a, the lead screw 78b whose axis is rotated by the motor 78a, and the lever portion 33 which is a part of the concave mirror 30, and is fitted on the outer periphery of the lead screw 78b. A grip portion 78d that rotates the concave mirror 30 by moving along the lead screw 78b due to the rotation of the shaft, 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. , Equipped with. The bracket 78c includes a connecting plate portion 78c4 which is an example of a plate portion formed so that at least a part of the side wall plate 83b, which is an example of the second side wall plate, overlaps in the thickness direction of the side wall plate 83b.
According to this configuration, by overlapping the side wall plate 83b and the connecting plate portion 78c4, it is possible to complicate the entry path of dust into the mirror driving hole 62b through the gap between the side wall plate 83b and the connecting plate portion 78c4. , It is possible to suppress the intrusion of dust into the mirror driving hole 62b.

The present disclosure 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 disclosure. An example of the modification will be described below.

(Modification example)
At least one of the three side wall plates 83b, 83c, and 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 changed as appropriate. For example, the mirror drive unit 78 may rotate the concave mirror 30 by a gear rotated by a motor.

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

The second substrate shield member 90 in the above embodiment may be omitted.
Further, 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 in 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 the present invention is not limited to this, and the side wall plate 83c is erected in the X direction. It may be provided at a position closer to the first connector 71 than the wall portion 62d. Further, two vertical wall portions 62d may be provided so as to sandwich the side wall plate 83c from the thickness direction of the side wall plate 83c. Further, the erection wall portion 62d may be omitted.
Further, although the side wall plate 83b was located outside the connecting plate portion 78c4 in the Y direction, it may be located inside 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 such as an airplane or a ship other than the vehicle 200. Further, the projected 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 1st lenticular lens 14 2nd lenticular lens 15 Condenser lens 16 Light source substrate 16a Light source 17 Heat source 19 Diffuse plate 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 side 62c1 Board installation part 62c2 Drive unit installation part 62d Standing wall part 62e, 62f , 68e, 68f Connector hole 63 Mirror holding case 68 Lower case 68a Exposed hole 70 Control board 70a Width long part 70b Width short part 70c Intermediate part 71 First connector 72 Second connector 73a First electronic component 73b Second electronic component 76 Board Parts 76a, 81d, 82d, 93a Threading holes 76b Mounting surface 78 Mirror drive unit 78a Motor 78b Lead screw 78c Bracket 78d Gripping part 78c1 Fixing part 78c2, 78c3 Support plate part 78c4 Connecting plate part 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 facing portion 83a Opposing plate 83b, 83c, 83d Side wall plate 90 Second substrate shield Member 100 Head-up display device 200 Vehicle 201 Front glass L Display light V Virtual image Sc Optical path space Ax Rotation axis

Claims (4)

A head-up display device that displays a virtual image by projecting display light onto a member to be projected.
A display unit that emits the display light and
A mirror that guides the display light from the display unit to the projected member,
A mirror drive unit that rotates the mirror and
A control board that controls at least one of the display unit and the mirror drive unit,
A substrate shield member that covers at least a part of the control substrate,
A case is provided in which the mirror is housed in an internal optical path space, and the mirror drive unit, the control board, and the board shield member are provided outside.
In the case, a hole used for transmitting a force from the mirror drive unit to the mirror is formed between the mirror drive unit and the mirror.
The substrate shield member includes a hole facing portion formed at a position facing the hole.
Head-up display device. The hole facing portion is
The facing plate facing the hole and
A side wall plate fixed to the edge of the facing plate and extending in a direction intersecting the facing plate.
The head-up display device according to claim 1. The case includes an upright wall portion formed so that at least a part of the first side wall plate, which is the side wall plate, overlaps in the thickness direction of the first side wall plate.
The head-up display device according to claim 2. The mirror drive unit is
With the motor
A lead screw whose shaft is rotated by the motor and
A grip portion that grips a part of the mirror, is fitted on the outer circumference of the lead screw, and rotates the mirror by moving along the lead screw by rotating the axis of the lead screw.
A bracket that supports the motor and the lead screw and is fixed to the case.
The bracket includes a plate portion formed so that at least a part of the second side wall plate, which is the side wall plate, overlaps in the thickness direction of the second side wall plate.
The head-up display device according to claim 2 or 3.

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