JP7655315B2 - Head-up display device - Google Patents

Description

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 (e.g., a vehicle windshield) and displays a virtual image of the image.

For example, Patent Document 1 describes a HUD device that includes a liquid crystal panel as a display unit that emits display light based on light emitted by a light source. The HUD device described in Patent Document 1 is configured to move the display unit to adjust the display position of the virtual image, thereby making it possible to adjust the position of the display unit in the optical axis direction of the display light.

Patent No. 4941070

As with the HUD device described in Patent Document 1, when adjusting the display position of a virtual image by moving only the display unit, the relative positions of the light source and the display unit change, causing the lighting specifications to change depending on the position of the display unit.

The present invention has been made in consideration of the above-mentioned situation, and aims to provide a head-up display device that can adjust the display position of a virtual image while suppressing changes in lighting specifications.

In order to achieve the above object, a head-up display device according to the present invention comprises:
a display unit including a light source, a display unit that emits display light based on light emitted by the light source, and a housing unit that houses the light source and the display unit and has a first opening through which the display light passes;
a housing that houses a reflector having a second opening that faces the first opening and that reflects the display light that enters the housing from the second opening toward an external light-transmitting member;
a position adjustment unit that adjusts a position of the display unit relative to the housing along a predetermined direction,
The position adjustment unit is
a rail that is immovable relative to the housing and extends in the predetermined direction;
a slider portion that is immovable relative to the housing portion, that is fitted to the rail, and that is slidable along the rail;
a drive unit that moves the accommodation unit and the slider unit along the predetermined direction,
the slider portion includes a first slider and a second slider that are spaced apart from each other in the predetermined direction,
the housing portion has a plate portion to which the slider portion is fixed,
the drive unit has a motor that moves a lead screw in the predetermined direction,
the position adjustment unit further includes a transmission unit that is fixed to the plate unit and transmits the power of the lead screw to the plate unit,
The lead screw and the transmission portion are connected via a ball joint .

According to the present invention, it is possible to adjust the display position of a virtual image while suppressing changes in lighting specifications.

1 is a schematic diagram showing a virtual image display mode of a head-up display (HUD) device according to an embodiment of the present invention; FIG. 2 is a schematic perspective view of the HUD device according to the embodiment. FIG. 3 is a schematic cross-sectional view of the HUD device according to the embodiment taken along line AA in FIG. 2 . FIG. 2 is a diagram showing the HUD device according to the embodiment as viewed from the Z direction. FIG. 2 is an enlarged perspective view of the vicinity of a first position adjustment unit in the HUD device according to the above embodiment. FIG. 4 is an enlarged perspective view of the vicinity of a first position adjustment unit according to the embodiment shown in FIG.

One embodiment of the present invention is described with reference to the drawings.

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

Below, each configuration may be explained using the left-right, up-down, and front-to-rear directions of vehicle 1. In appropriate drawings, the X-axis along the left-right direction, the Y-axis along the up-down direction, and the Z-axis along the front-to-rear direction are shown. In addition, the direction in which the arrows indicating each of the X, Y, and Z axes point may be referred to as the "+" direction, and the opposite direction as the "-" direction.

The HUD device 100 includes a display unit 10, a reflecting section 20, a housing 30, and an elastic section 40, as shown in Fig. 3. The HUD device 100 also includes a position adjustment section 50 and a limit switch 60, as shown in Fig. 4. The HUD device 100 also includes a control section 70, as shown diagrammatically in Fig. 3.

Figure 3 shows a schematic cross-sectional view of the HUD device 100 taken along line A-A in Figure 2, and a block diagram of the control unit 70. In the schematic cross-sectional view of Figure 3, hatching indicating cross sections of appropriate components has been omitted for ease of viewing. Figure 6 is an enlarged perspective view of the vicinity of the first position adjustment unit 50a (described below), with the housing 30 omitted.

The display unit 10 has a display section 11, an illumination section 12 that illuminates the display section 11 from below, and a storage section 13 that houses the display section 11 and the illumination section 12.

The display unit 11 is composed of, for example, a TFT (Thin Film Transistor) type liquid crystal panel. The illumination unit 12 has a light source 12a, for example, an LED (Light Emitting Diode), a lens 12b, and a light box 12c. Light emitted by the light source 12a is focused by the lens 12b, for example, a condenser lens, and passes through the light box 12c to illuminate the display unit 11. The display unit 11 displays an image on the display surface 11a by being illuminated by the illumination unit 12. As a result, display light L representing the image is emitted from the display unit 11. The image display operation of the display unit 11 is controlled by the control unit 70. The light source 12a is mounted on a light source board 14, and the light emission operation is controlled by the control unit 70.

In this embodiment, the central ray of the light emitted from the light source 12a and the display light L radiated from the display unit 11 is set along a β-axis obtained by tilting the Y-axis backward, as shown in Fig. 3. The normal line of the display surface 11a of the display unit 11 is set at an angle to the β-axis. This makes it possible to prevent external light that has entered the inside of the display unit 10 from being reflected by the display surface 11a and becoming unnecessary light (hereinafter referred to as "stray light") for displaying by the HUD device 100.
3 and other figures show a typical ray of the display light L, but in reality, the display light L is a light flux passing through the optical system in the HUD device 100, and includes rays at various angles with respect to a central ray of the light flux. The central ray of the display light L can be defined as a ray connecting the center of the display surface 11a and the center of an eye box, which is defined as a range in which the user 4 can view the virtual image V. In this embodiment, the movement direction of the display unit 10, which will be described later, is set to a direction along the β axis (hereinafter referred to as the β direction).

The storage section 13 is a housing for the display unit 10, and stores the display section 11 and the illumination section 12. As shown in Fig. 3, the storage section 13 has a main body section 130 formed in a box shape and having a storage space for the display section 11 and the illumination section 12, and a pair of plate sections 131, 132 as shown in Fig. 4. As shown in Fig. 3, the main body section 130 has a first opening H1 that opens upward. The display unit 10 emits display light L generated by the display section 11 from the first opening H1 toward a mirror 21 described below.

As shown in Fig. 4, a plate portion 131 is provided on one of the outer surfaces of the main body portion 130 facing the X direction, and a plate portion 132 is provided on the other. The plate portions 131 and 132 face each other across the main body portion 130, and their main surfaces are parallel to each other. The main body portion 130 and the pair of plate portions 131, 132 may be integral or separate.

As shown in FIG. 3, the reflecting unit 20 has a mirror 21 made of a free-form curved mirror and a concave mirror 22. The mirror 21 reflects the display light L from the display unit 10 toward the concave mirror 22. The concave mirror 22 reflects the display light L from the mirror 21 toward the windshield 3 (an example of a translucent member outside the housing 30). Due to the display light L reflected by the concave mirror 22, the virtual image V viewed by the user 4 is enlarged compared to the image displayed on the display unit 11. The mirror 21 may be a plane mirror. The type and number of mirrors constituting the reflecting unit 20 can be changed as desired according to the design.

As shown in Figure 3, the housing 30 has a main case 30a that houses the reflecting section 20 in an appropriate position that satisfies the above-mentioned functions, and as shown in Figure 4, an opposing plate 31 that faces the plate section 131 of the storage section 13, and an opposing plate 32 that faces the plate section 132 of the storage section 13.

The main case 30a is box-shaped and opens upward. As shown in Fig. 3, a second opening H2 is formed in a bottom 31b of the main case 30a. The second opening H2 is provided at a position facing the first opening H1 of the display unit 10 in the β direction. The display light L emitted from the first opening H1 of the display unit 10 passes through the second opening H2, reaches the inside of the housing 30, and is incident on the mirror 21.
The main case 30a is provided with an upper case (not shown) connected to its upper end. The upper case is formed with a third opening through which the display light L reflected by the concave mirror 22 passes to the windshield 3 shown in FIG. 1. The upper case is also provided with a translucent cover glass (not shown) that closes the third opening. The display light L reflected by the concave mirror 22 passes through the cover glass toward the windshield 3.

As shown in Figure 4, an opposing plate 31 is provided on one of the outer surfaces of the main case 30a facing the X direction, and an opposing plate 32 is provided on the other. The opposing plate 31 is located outside the plate portion 131 and is spaced apart from the plate portion 131 in the X direction. The opposing plate 32 is located outside the plate portion 132 and is spaced apart from the plate portion 132 in the X direction.

As shown in FIG. 3, the elastic portion 40 is a cylindrical member that connects the first opening H1 and the second opening H2, and in its hollow portion, an optical path for the display light L passing from the first opening H1 to the second opening H2 is secured. The elastic portion 40 is formed, for example, from urethane foam, and is formed in a rectangular cylindrical shape with a square outer periphery. The elastic portion 40 is fixed to at least one of the storage portion 13 and the housing 30. The elastic portion 40 is positioned between the housing 30 and the storage portion 13 in a state where it is compressed in the β direction by both of them. The elastic portion 40 maintains the state in which the first opening H1 and the second opening H2 are connected, even if the display unit 10 moves within the movable range R along the β axis. This makes it possible to suppress the display light L from leaking out of the gap between the display unit 10 and the housing 30, causing stray light. Furthermore, the elastic portion 40 maintains the state in which the first opening H1 and the second opening H2 are connected, thereby making it possible to prevent dust from entering the HUD device 100 from the outside.

The position adjustment unit 50 shown in FIG. 4 is a configuration for adjusting the position of the display unit 10 relative to the housing 30. In this embodiment, the position adjustment unit 50 adjusts the position of the display unit 10 in the β direction relative to the housing 30. Specifically, the position adjustment unit 50 moves the display unit 10 relative to the housing 30 within a movable range R (see FIG. 3) along the β direction. In the movable range R of the display unit 10 by the position adjustment unit 50, even if the display unit 10 is at a position closest to the housing 30 (hereinafter referred to as the closest position), the upper end of the display unit 10 does not contact the housing 30. In addition, in the movable range R, the position at which the display unit 10 is farthest from the housing 30 (hereinafter referred to as the farthest position) is determined as a position a predetermined distance away from the closest position along the β direction. In other words, the movable range R in this embodiment is the movement range of the display unit 10 from the closest position to the farthest position in the β direction.

In this embodiment, as shown in Figure 4, there are a pair of position adjustment units 50, one designated as a first position adjustment unit 50a and the other designated as a second position adjustment unit 50b. The first position adjustment unit 50a is located at the -X side end of the HUD device 100, and the second position adjustment unit 50b is located at the +X side end. Since the first position adjustment unit 50a and the second position adjustment unit 50b have the same configuration, the following will mainly describe the configuration of the first position adjustment unit 50a, and will omit a description of the second position adjustment unit 50b.

As shown in FIG. 4, the first position adjustment unit 50a includes a rail 51a, a slider unit 52a, a drive unit 53a, a transmission unit 54a, and a ball joint 55a.

The rail 51a is immovable relative to the housing 30 and extends in the β direction as shown in Figure 4. Specifically, the rail 51a is fixed to the surface of the opposing plate 31 facing the storage section 13 (plate section 131).

As shown in Figures 5 and 6, the axis that is perpendicular to the β axis and extends in the width direction of the rail 51a is the γ axis, and the axis that is perpendicular to the β and γ axes is the α axis. In the following, in order to make it easier to understand the configuration of the position adjustment unit 50, the α, β, and γ axes may be used for explanation. Also, the direction in which the arrows indicating the α, β, and γ axes point may be referred to as the "+" direction, and the opposite direction as the "-" direction.

The slider portion 52a is immovable relative to the storage portion 13, and is configured to be fitted into the rail 51a and to be slidable along the rail 51a as shown in FIG. 4. Specifically, the slider portion 52a has a first slider S1 and a second slider S2 arranged at a distance from each other in the β direction as shown in FIG. 6. The plate portion 131 is provided with pedestal portions 131a and 131b which protrude in the -α direction and are arranged at a distance from each other in the β direction. The first slider S1 is fixed to the pedestal portion 131a, and the second slider S2 is fixed to the pedestal portion 131b.

The first slider S1 and the second slider S2 arranged at an interval from each other in the β direction suppress the rotational movement of the housing 13 (i.e., the display unit 10) around the γ-axis and the movement in the α-direction with respect to the rail 51a that is immobile with respect to the housing 30. This makes it possible to suppress rattling of the display unit 10 in the rotational direction around the γ-axis and in the α-direction with respect to the housing 30.
In addition, the first slider S1 and the second slider S2 each have a shape that sandwiches the rail 51a in the γ direction (i.e., the width direction of the rail 51a). With this configuration, it is possible to suppress the movement of the slider portion 52a in the γ direction relative to the rail 51a. As a result, it is possible to suppress rattling of the display unit 10 in the γ direction relative to the housing 30.
As a result, movement of the slider portion 52a relative to the rail 51a in the β direction is permitted while rattling in other directions is suppressed, and the display unit 10 can be driven stably relative to the housing 30.

The drive unit 53a is configured to move the storage unit 13 and the slider unit 52a along the β direction, and includes a motor M and a lead screw N. The motor M is, for example, a stepping motor, and is fixed to a motor fixing unit 31a provided on the surface of the opposing plate 31 facing the -α direction, as shown in FIG. 5. The lead screw N extends in the β direction, and moves linearly in the β direction in response to the rotation of the motor M by a ball screw mechanism. The lead screw N can reciprocate in the β axis direction relative to the motor M. The lead screw N is supported by the motor M so that it can be tilted by a predetermined angle (for example, about 5°) relative to the β axis. The lead screw N is also biased in the -β direction by a spring (not shown) provided inside the motor M.

The transmission unit 54a is fixed to the plate portion 131 and transmits the power of the lead screw N to the plate portion 131. Specifically, as shown in FIG. 6, the transmission unit 54a is formed in a U-shape with a base portion 540 and a pair of legs 541, 542 connected to the base portion 540. The transmission unit 54a is fixed to the base portion 131a of the plate portion 131 with the pair of legs 541, 542 straddling the rail 51a and the first slider S1. As shown in FIG. 5, the base portion 540 of the transmission unit 54a is located on the outer side (-α side) of the opposing plate 31. The legs 541, 542 of the transmission unit 54a pass through guide holes G1, G2 provided in the opposing plate 31 and reach the inner side (+α side) of the opposing plate 31. The guide holes G1 and G2 are elongated holes that penetrate the opposing plate 31 in the α direction and extend in the β direction, and guide the movement of the transmission portion 54a in the β direction.

The ball joint 55a has a ball stud and a socket that makes spherical contact with the ball of the ball stud, and connects the lead screw N and the transmission unit 54a as shown in Figure 6. For example, the ball of the ball stud is rotatable around point C shown in the figure. The ball joint 55a has a ball stud fixed to the base 540 of the transmission unit 54a, and a socket fixed to the tip of the lead screw N. This configuration makes it possible to absorb misalignment in the rotational direction around point C while maintaining high rigidity in the β direction and connecting the lead screw N and the transmission unit 54a.

Here, the configuration of the slider portion 52a described above effectively suppresses rattling of the display unit 10 relative to the housing 30, but there is a possibility that the clearance between the parts may not be maintained. However, the alignment of the position of the display unit 10 relative to the housing 30 can be effectively adjusted by the ball joint 55a and the lead screw N, which can be tilted by a predetermined angle relative to the β axis as described above and has elasticity in the β direction.

Similar to the first position adjustment unit 50a having the above-mentioned configuration, the second position adjustment unit 50b includes a rail 51b, a drive unit 53b, a transmission unit 54b and a ball joint 55b shown in FIG. 4, as well as a slider unit (not shown).

The limit switch 60 determines the position at which the display unit 10 is furthest from the housing 30 (the furthest position described above), and in this embodiment, is provided in the first position adjustment unit 50a. Specifically, the limit switch 60 is fixed to a surface facing the housing unit 13 (plate portion 131) of the opposing plate 31. Also, as shown in FIG. 6, the limit switch 60 is provided at a position facing the first slider S1 in the β direction, and when the slider 52a moves in the −β direction, it comes into contact with the first slider S1 and supplies a detection signal indicating the contact to the control unit 70. The control unit 70 controls the drive of the display unit 10, with the position of the display unit 10 at the time of acquiring the detection signal as the origin. Note that the limit switch 60 may be provided in either the first position adjustment unit 50a or the second position adjustment unit 50b, and may be provided only in the second position adjustment unit 50b.
Although an example in which the limit switch 60 is a mechanical switch has been shown, other elements may be applied. The limit switch 60 may be configured with an element such as a photointerrupter, an encoder, or a magnetic switch, which is an element that can determine the farthest position of the display unit 10 from the housing 30. The limit switch 60 may also detect the position of the display unit based on the back electromotive force generated in the motor M.

The control unit 70, which is shown in FIG. 3, controls the overall operation of the HUD device 100 and is composed of a microcomputer having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc. The ROM stores fixed data such as an operating program for controlling the overall operation of the HUD device 100 and image part data required to compose an image displayed by the display unit 11 (i.e., an image viewed as a virtual image V). The control unit 70 controls the display operation of the image by the display unit 11 via a display drive circuit (not shown). The control unit 70 may have a video memory dedicated to image storage. The function of the control unit 70 may also be realized by the cooperation of multiple microcomputers. The control unit 70 is provided, for example, at any position in the storage unit 13 or the housing 30.

The control unit 70 also drives the position adjustment unit 50 via a drive circuit for position adjustment (not shown) to adjust the position of the display unit 10 relative to the housing 30. When the display unit 10 at a predetermined position approaches the housing 30, the virtual image V is displayed closer to the user 4 than when the display unit 10 was at the predetermined position. On the other hand, when the display unit 10 at a predetermined position moves away from the housing 30, the virtual image V is displayed farther from the user 4 than when the display unit 10 was at the predetermined position.

In this embodiment, the control unit 70 drives the motor M of the first position adjustment unit 50a and the motor (not shown) of the second position adjustment unit 50b with the same drive signal. In this way, by driving the first position adjustment unit 50a and the second position adjustment unit 50b with a common drive signal, the first position adjustment unit 50a and the second position adjustment unit 50b can be aligned with simple control (i.e., the first position adjustment unit 50a and the second position adjustment unit 50b cooperate to drive the display unit 10 with stable operation). The control unit 70 may drive the motor M of the first position adjustment unit 50a and the motor (not shown) of the second position adjustment unit 50b with drive signals synchronized with each other.

The control unit 70 also communicates with various systems (not shown) configured in the vehicle 1, such as an operation unit and an ECU (Electronic Control Unit), by known methods. The operation unit is composed of input devices such as a button, a touch pad, and a touch panel. The operation unit accepts operations by the user 4 and supplies a signal indicating the accepted content to the control unit 70. The user 4 can input commands to the HUD device 100 through the operation unit. For example, the user 4 can adjust the position of the display unit 10 through the operation unit to adjust the display position of the virtual image V to match his/her viewpoint. The ECU controls the operation of each part of the vehicle 1. For example, the control unit 70 acquires vehicle information indicating the state of the vehicle 1, including measured quantities such as vehicle speed, from the ECU. The control unit 70 can then display an image indicating the vehicle information acquired from the ECU as a virtual image V.

The operation of the HUD device 100 configured as described above when driving the display unit 10 will be briefly described below. The control unit 70 drives the first position adjustment unit 50a and the second position adjustment unit 50b in response to the position adjustment operation by the user 4. At this time, the control unit 70 drives the motor M of the first position adjustment unit 50a and the motor (not shown) of the second position adjustment unit 50b with the same drive signal or drive signals synchronized with each other. When the motor M of the first position adjustment unit 50a rotates in response to the supplied drive signal, the lead screw N moves linearly along the β direction in response to the rotation of the motor M. The linear movement of the lead screw N is transmitted to the plate unit 131 via the ball joint 55a and the transmission unit 54. The second position adjustment unit 50b also operates in the same manner. As a result, the storage unit 13 (i.e., the display unit 10) moves in the β direction relative to the housing 30. The control unit 70 adjusts the position of the display unit 10 with respect to the housing 30 by controlling the amount of movement in the β direction and the direction.

Note that the present invention is not limited to the above-described embodiments and drawings. Appropriate modifications (including the deletion of components) may be made without departing from the spirit of the present invention.

In the above description, the display unit 10 is moved by driving the drive units 53a, 53b provided in both the first position adjustment unit 50a and the second position adjustment unit 50b, but the configuration of the position adjustment unit 50 is not limited to this. For example, a configuration in which a drive unit is provided in only one of the first position adjustment unit 50a and the second position adjustment unit 50b may be adopted.

In the above description, for design reasons, an example is shown in which the transmission unit 54a is fixed to the base portion 131a to which the first slider S1 is fixed, as shown in Figure 6, but the fixing location of the transmission unit 54a is not limited to this. From the viewpoint of stably driving the display unit 10, it is preferable that the fixing location of the transmission unit 54a is the middle position between the first slider S1 and the second slider S2 in the β direction.

Although the above describes an example in which the elastic portion 40 is made of urethane foam, the configuration of the elastic portion 40 is arbitrary as long as the first opening H1 and the second opening H2 can be maintained in a connected state even when the display unit 10 moves within the movable range R. For example, the cylindrical elastic portion 40 connecting the first opening H1 and the second opening H2 may be made of a sponge material other than urethane foam, a bellows material, an elastomer including rubber, or the like.

The optical system in the HUD device 100 may be configured as desired as long as the display light L from the display unit 10 can be reflected by the reflector 20 toward the windshield 3, which is an example of an external translucent member. In the above description, an example has been shown in which the position adjustment unit 50 moves the display unit 10 in the β direction relative to the housing 30, but the direction in which the display unit 10 is moved by the position adjustment unit 50 is arbitrary. Note that it is preferable that the direction of movement of the display unit 10 coincides with the direction of the central ray of the display light L traveling from the display unit 10 to the reflector 20 (mirror 21 in the above embodiment). In addition, the second opening H2 of the housing 30 and the first opening H1 of the display unit 10 may be opposed to each other in the direction of movement of the display unit 10.

Although the above shows an example in which the display section 11 of the display unit 10 is made of a liquid crystal panel, the configuration of the display section 11 and the display unit 10 is not limited and is arbitrary. For example, the display section 11 of the display unit 10 may be made of an OLED (Organic Light-Emitting Diode). The display unit 10 may also be configured with a DMD (Digital Micromirror Device) and a display section 11 made of a transmissive screen that receives light reflected by the DMD and displays an image.

The translucent member that reflects the HUD device 100 toward the user 4 is not limited to the windshield 3 of the vehicle 1, but may be a combiner composed of a plate-shaped half mirror, a hologram element, etc.

The type of vehicle 1 on which the HUD device 100 is mounted is not limited, and the HUD device 100 can be applied to various vehicles such as four-wheeled motor vehicles and motorcycles. The HUD device 100 may also be mounted on vehicles other than the vehicle 1, such as aircraft, ships, and snowmobiles.

(1) The HUD device 100 described above includes a position adjustment unit 50 that adjusts the position of the display unit 10 along the β direction relative to the housing 30. The position adjustment unit 50 includes a rail 51a that is immovable relative to the housing 30, a slider unit 52a that is immovable relative to the housing 30, and a drive unit 53a that moves the slider unit 52a along the β direction (an example of a predetermined direction). The slider unit 52a has a first slider S1 and a second slider S2 that are fitted to the rail 51a and arranged at an interval from each other in the β direction. With this configuration, the entire display unit 10 can be moved without changing the relative positions of the light source 12a and the display unit 11, so that the display position of the virtual image can be adjusted while suppressing changes in the lighting specifications. In addition, the first slider S1 and the second slider S2, which are arranged at a distance from each other in the β direction, suppress rattling of the display unit 10 in the rotational direction around the γ axis and in the α direction relative to the housing 30, allowing the display unit 10 to be moved stably.

(2) In addition, the first slider S1 and the second slider S2 each have a shape that sandwiches the rail 51a in the width direction (γ direction) of the rail 51a. With this configuration, as described above, it is possible to suppress wobbling of the display unit 10 in the γ direction relative to the housing 30, and it is possible to move the display unit 10 more stably.

(3) Furthermore, the drive unit 53a has a motor M that moves the lead screw N in the β direction, and the position adjustment unit 50 is fixed to the plate portion 131 of the storage unit 13 and further includes a transmission unit 54a that transmits the power of the lead screw N to the plate portion 131. The lead screw N and the transmission unit 54a are connected via a ball joint 55a. With this configuration, as described above, it is possible to absorb misalignment in the rotational direction centered on point C while connecting the lead screw N and the transmission unit 54a with high rigidity maintained in the β direction.

(4) In addition, there is a pair of position adjustment units 50, one of which is the first position adjustment unit 50a and the other of which is the second position adjustment unit 50b. The motor M of the first position adjustment unit 50a and the motor of the second position adjustment unit 50b are driven by the same signal or signals synchronized with each other. With this configuration, as described above, the first position adjustment unit 50a and the second position adjustment unit 50b can be aligned with simple control.

(5) The HUD device 100 further includes a limit switch 60 that determines the farthest position of the display unit 10 from the housing 30. The limit switch 60 is provided in either the first position adjustment unit 50a or the second position adjustment unit 50b. This configuration makes it possible to align the first position adjustment unit 50a and the second position adjustment unit 50b with a simple configuration.

In the above explanation, explanations of well-known technical matters have been omitted as appropriate in order to facilitate understanding of the present invention.

LIST OF SYMBOLS 100...Head-up display (HUD) device 10...Display unit 11...Display section 12...Illumination section, 12a...Light source, 12b...Lens, 12c...Light box 13...Storage section, H1...First opening 130...Main body section 131, 132...Plate section, 131a, 131b...Base section 20...Reflecting section 30...Housing 30a...Main case, 30b...Bottom, H2...Second opening 31, 32...Opposite plate, 31a...Motor fixing section, G1, G2...Guide hole 40...Elastic section 50...Position adjustment section 50a...First position adjustment section, 50b...Second position adjustment section 51a...Rail 52a...Slider section, S1...First slider, S2...Second slider 53a...Drive section, M...Motor, N...Lead screw Reference Signs List 54a: Transmission section, 540: Base section, 541, 542: Legs 55a: Ball joint 60: Limit switch 70: Control section 1: Vehicle, 2: Dashboard, 3: Windshield, 4: User L: Display light, V: Virtual image

Claims (4)

a display unit including a light source, a display unit that emits display light based on light emitted by the light source, and a housing unit that houses the light source and the display unit and has a first opening through which the display light passes;
a housing that houses a reflector having a second opening that faces the first opening and that reflects the display light that enters the housing from the second opening toward an external light-transmitting member;
a position adjustment unit that adjusts a position of the display unit relative to the housing along a predetermined direction,
The position adjustment unit is
a rail that is immovable relative to the housing and extends in the predetermined direction;
a slider portion that is immovable relative to the housing portion, that is fitted to the rail, and that is slidable along the rail;
a drive unit that moves the accommodation unit and the slider unit along the predetermined direction,
the slider portion includes a first slider and a second slider that are spaced apart from each other in the predetermined direction,
the housing portion has a plate portion to which the slider portion is fixed,
the drive unit has a motor that moves a lead screw in the predetermined direction,
the position adjustment unit further includes a transmission unit that is fixed to the plate unit and transmits the power of the lead screw to the plate unit,
The lead screw and the transmission unit are connected via a ball joint.
Head-up display device. the first slider and the second slider each have a shape that sandwiches the rail in a width direction of the rail;
The head-up display device according to claim 1 . The position adjustment unit is a pair, one of which is a first position adjustment unit and the other of which is a second position adjustment unit.
The motor of the first position adjustment unit and the motor of the second position adjustment unit are driven by the same signal or signals synchronized with each other.
The head-up display device according to claim 1 or 2 . A limit switch is further provided to define a position at which the display unit is farthest from the housing.
The limit switch is provided in either the first position adjustment unit or the second position adjustment unit.
The head-up display device according to claim 3 .

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