Head-up display device

Abstract

To provide a head-up display device which inhibits blurring of a display image.SOLUTION: A head-up display device (a display device 102) displays a virtual image V by projecting display light L on a windshield 103 and includes: a liquid crystal display 110 which emits the display light L; a concave mirror 131 which reflects the display light L; a holder 132 which holds the concave mirror 131; a housing 140 which rotatably holds the holder 132; and a drive device 1 which supports an elastic plate part 24 formed at the holder 132 and rotates the holder 132. The elastic plate part 24 has elasticity and presses a support part 16.SELECTED DRAWING: Figure 4

Description

Technical Field

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[0001] The present disclosure relates to a head-up display device having a drive device for rotating a reflector.

Background Art

[0002] Conventionally, as disclosed in Patent Document 1, there is known a head-up display device that reflects display light from a display element by a reflector (concave mirror) and projects it onto a vehicle windshield, and allows a driver of the vehicle to visually recognize the projected display image (virtual image). In such a head-up display device, generally, in order to adjust the reflection angle of the display light by the reflecting member, a holder holding the concave mirror is rotated about a predetermined rotation axis.

Prior Art Documents

Patent Documents

[0007] [Figure 1] This is a schematic diagram of the head-up display device according to the first embodiment. [Figure 2] This is a schematic cross-sectional view of a head-up display device according to the first embodiment. [Figure 3] This is a side view showing the configuration of the drive device and holder according to the first embodiment. [Figure 4] This is a side view showing a drive device according to the first embodiment. [Figure 5] This is a perspective view showing the configuration of the lever cover according to the first embodiment. [Figure 6] This is a side view showing the drive operation of the drive device according to the first embodiment. [Modes for carrying out the invention]

[0008] Embodiments of this disclosure will be described below with reference to the drawings.

[0009] First, an embodiment of a vehicle head-up display device according to the present disclosure will be described with reference to Figures 1 and 2. Figure 1 is a schematic configuration diagram of a head-up display device according to one embodiment of the present disclosure. Figure 2 is a schematic cross-sectional view of a head-up display device according to one embodiment of the present disclosure.

[0010] As shown in Figure 1, the head-up display device is configured as a display device 102 installed inside the instrument panel 101 of the vehicle 100. The display device 102 projects display light L, which is reflected by the windshield 103, the projection target, towards the driver 104 of the vehicle 100, thereby displaying a virtual image (display image) V. In other words, the head-up display device (display device 102) projects display light L emitted from the liquid crystal display 110 onto the windshield 103, and allows the driver 104 to view the virtual image V obtained by this projection. As a result, the driver 104 can observe the virtual image V superimposed on the scenery.

[0011] As shown in Figure 2, the display device 102 includes a liquid crystal display 110, a first reflector 120, a second reflector 130, and a housing 140 (case).

[0012] The liquid crystal display 110 is an example of a display and comprises a light source 111 and a liquid crystal display element (display element) 112. The light source 111 consists of a light-emitting diode mounted on a wiring board R. The liquid crystal display element 112 is a thin-film transistor (TFT) type liquid crystal display element located in front of (directly above) the light source 111 so as to transmit illumination light from the light source 111 to form display light L. Based on a drive signal from an element drive circuit (not shown), the liquid crystal display element 112 illuminates information to be displayed (for example, vehicle speed or engine speed) as numerical values ​​using light emitted from the light source 111 located behind (directly below) it. The information to be displayed is not limited to vehicle speed or engine speed, and the display format is not limited to numerical display; any format can be adopted. The liquid crystal display 110 emits display light L consisting of light in the visible wavelength range, and for example, a light source 111 that emits red light (mainly in the emission wavelength range of 610-640 nm) can be used.

[0013] Such a liquid crystal display 110 is installed inside the housing 140 such that the surface on which the display light L is emitted faces the cold mirror 121 of the first reflector 120, which will be described later, and is fixedly held in a position and orientation such that the optical axis of the display light L intersects with the cold mirror 121.

[0014] The first reflector 120 includes a cold mirror 121 and a mounting member 122 for fixing the cold mirror 121 to the housing 140. The cold mirror 121 reflects the display light L emitted from the liquid crystal display 110 toward the second reflector 130 (concave mirror 131). The cold mirror 121 has a substantially rectangular glass substrate 121a and a first reflective layer 121b consisting of a multilayer interference film of different thicknesses formed by vapor deposition or the like on one side of the glass substrate 121a (the side of the second reflector 130 facing the concave mirror 131, which will be described later). The mounting member 122 is made of, for example, a black synthetic resin material and is fixed to the housing 140.

[0015] The cold mirror 121 reflects light in the visible wavelength range (450-750 nm), which includes the emission wavelength range of the liquid crystal display 110, with high reflectivity (e.g., 80% or more), and reflects light outside the visible wavelength range with low reflectivity. In this case, the cold mirror 121 is one that reflects light outside the visible wavelength range, especially light in the infrared wavelength range (infrared rays or heat rays from sunlight), with low reflectivity (e.g., 15% or less). Light that is not reflected by the first reflective layer 121b is transmitted through the cold mirror 121. In this embodiment, the cold mirror 121 is positioned in a location that is not directly visible from the translucent cover 144 of the housing 140, similar to the liquid crystal display 110, so that it is not directly exposed to external light such as sunlight.

[0016] The second reflector 130 (mirror) includes a concave mirror 131 and a holder 132 that holds the concave mirror 131. The concave mirror 131 has a second reflective layer 131a deposited on the concave surface of a resin substrate made of polycarbonate, and while expanding the display light L from the cold mirror 121 (i.e., the liquid crystal display element 112), it reflects the light toward the windshield 103 through the transparent cover 144 of the housing 140. The concave mirror 131 is arranged such that the second reflective layer 131a faces the cold mirror 121 and the transparent cover 144 of the housing 140, and is arranged at a position visible from the transparent cover 144.

[0017] The holder 132 is made of a high-rigidity material (e.g., magnesium) and has a rotation axis A orthogonal to the optical axis of the display light L, which is pivotally supported by a bearing portion provided in the housing 140. That is, the holder 132 and the concave mirror 131 held thereon are rotatable about the rotation axis A, whereby the angular position of the holder 132, i.e., the projection direction of the display light L, can be adjusted. A protruding piece 132a that partially protrudes outward in the radial direction of the rotation axis A is formed on the holder 132. By moving this protruding piece 132a by the driving force from the driving device 1, the holder 132 can be rotated.

[0018] As shown in FIG. 3, the holder 132 integrally forms a bent portion 132b, an arm portion 132c (lever), together with the protruding portion 132a.

[0019] The bent portion 132b is formed in a shape along the rotation direction with respect to the protruding portion 132a formed in the radial direction. The bent portion 132b is provided in a shape for offsetting the mounting position of the driving device 1 in the rotation direction with respect to the position where the holder 132 is used. In this case, when there are other components mounted on the vehicle 100 in the left direction within the drawing, in order to shift the mounting position of the driving device 1 to the right direction within the drawing, the illustrated shape is formed.

[0020] The arm portion 132c (lever) has a surface shape that is roughly aligned in the radial direction and is supported by the drive unit 1, thereby transmitting the driving force from the drive unit 1 to the entire holder 132. As shown in Figure 3, a lever cover 20 is provided on the arm portion 132c. The detailed structure of the lever cover 20 will be described later. Hereafter, support of the arm portion 132c by the drive unit 1 actually means supporting the arm portion 132c by pressing against the lever cover 20.

[0021] The housing 140 is formed, for example, from die-cast aluminum and has an upper case body 141, a lower case body 142, and a rear cover 142a. The upper case body 141, the lower case body 142, and the rear cover 142a form an internal space 143, in which the liquid crystal display 110, the first reflector 120, and the second reflector 130 are housed.

[0022] An opening 141a is formed in the upper case body 141 at a position opposite the concave mirror 131, and a translucent cover 144 is positioned to cover this opening 141a. The translucent cover 144 is made of a translucent synthetic resin material (for example, acrylic resin) and functions as a light-transmitting member through which the display light L reflected by the concave mirror 131 is transmitted (passed). In other words, the display light L reflected by the concave mirror 131 is projected onto the windshield 103 through the translucent cover 144 provided on the housing 140, thereby displaying the virtual image V.

[0023] Referring to Figures 3 to 6, the configuration of the drive unit 1 will be described in detail, mainly.

[0024] The drive unit 1 comprises a lead screw 12 with a helical groove formed on its outer circumference, a drive unit 11 that rotates the lead screw 12 around its axis, a movable member 15 that engages with the helical groove and moves in the axial direction, and a frame 14 that supports the drive unit 11 and the like. A guide shaft 13 is fixed to the frame 14, which is arranged parallel to the axial direction of the lead screw 12. The drive unit 11 is a motor such as a stepping motor, and is generally composed of a stator that constitutes a motor case and a rotor (not shown) arranged inside the stator. The rotor comprises a shaft and a permanent magnet (not shown) fixed to the shaft.

[0025] Terminal pins, which serve as power supply points, are provided on the side of the stator and are electrically connected to the circuit board 17. The terminal ends (not shown) of the stator's drive coils are wrapped around the terminal pins, and by soldering the terminal pins to the circuit board 17, an electrical connection can be made between the circuit board 17 and the drive coils.

[0026] A switch unit 18 is mounted on the frame 14. The switch unit 18 is a push-type switch that detects the origin position of the movable member 15 in the direction of movement (axial direction). The electrical connection between the switch unit 18 and the circuit board 17 is made by soldering the terminal pins of the switch unit 18 to the circuit board 17.

[0027] The frame 14 has a plate-shaped frame body and a pair of support parts formed by bending both ends of the frame body in the longitudinal direction, and is fixed to the housing 140 using holes or the like formed in the frame body.

[0028] The lead screw 12 is integrally formed with the shaft of the drive unit 11, and is constructed by forming a helical groove on the outer surface of a portion of the shaft (the portion protruding from the stator to the axial output side L1). Therefore, the lead screw 12 is rotationally driven by the drive unit 11. The lead screw 12 is positioned approximately parallel to the frame body, and its axial output end is rotatably supported by the frame 14. The guide shaft 13 is positioned parallel to the lead screw 12, and both ends are fixed to the support portions 2b and 2c of the frame 14, respectively.

[0029] The movable member 15 comprises a nut unit (not shown) that meshes with the lead screw 12 and moves axially, a main body that moves axially integrally with the nut unit, and a support part 16 provided above the main body that supports the arm portion 132c of the holder 132, which is the supported part. The main body has a guide hole through which the guide shaft 13 passes and a nut arrangement portion (not shown) where the nut unit is placed. As the lead screw 12 rotates by the drive unit 11, the nut unit of the movable member 15 reciprocates axially, and the movable member 15 reciprocates axially while being guided by the guide shaft 13. As a result, the arm portion 132c reciprocates axially, allowing the holder 132 to rotate to a predetermined angle (position) around the rotation axis A (see Figure 2).

[0030] As the support portion 16, fixed support portions 16a and 16b are provided opposite each other so as to sandwich the arm portion 132c of the holder 132. Of these, for example, a projection 16c is formed on the fixed support portion 16a. The projection 16c has the effect of making it easier to maintain point contact between the fixed support portion 16a and the arm portion 132c.

[0031] The fixed support portion 16 is made of a metal such as stainless steel and is formed from a material with higher rigidity than the main body portion which is made of resin. The fixed support portion 16 is integrally formed with the main body portion by insert molding. Therefore, the fixed support portion 16 is partially embedded and fixed in the main body portion. With this configuration, the strength of the fixed support portion 16 can be improved compared to the case in which the fixed support portion 16 is integrally formed with the main body portion from resin. As a result, the resonant frequency of the display device 102 as a whole can be increased, the occurrence of resonance due to vehicle vibration can be suppressed and blurring of the displayed image can be suppressed.

[0032] As shown in Figure 5, the lever cover 20 is an approximately U-shaped cover member that forms, for example, a first plate portion 21, a bent portion 22, and a second plate portion 23. The lever cover 20 is formed, for example, by punching, bending, and surface processing on plate-shaped stainless steel (plate-shaped metal material). It is preferable that the lever cover 20 be made of a material that is more elastically deformable than the material used for the holder 132. The lever cover 20 has ends 210 and 230 formed at the tips of each plate portion. The lever cover 20 is attached to the arm portion 132c in the direction that these ends point, and is held in place by the arm portion 132c.

[0033] As shown in Figure 3, the lever cover 20 is held by the arm portion 132c by sandwiching the arm portion 132b, which is planar in shape along the radial direction, between the first plate portion 21 and the second plate portion 23. Alternatively, the lever cover 20 may also be held by the engagement of a hole provided in the plate portion with a projection provided in the arm portion.

[0034] An elastic plate portion 24 is further formed on the first plate portion 21, having a fixed end 24a and a free end 24b. The elastic plate portion 24 is an elastically supported portion, and as shown in Figures 3 and 6, it presses against the fixed support portion 16 of the drive device 1 by the elastic force obtained by the bending of the elastic plate portion 24 itself. The elastic plate portion 24 is formed, for example, by punching a U-shape out of the center of the first plate portion 21 and bending the tip upwards. The elastic plate portion 24 formed in this way has a fixed end 24a as a connection portion with the first plate portion 21, and a free end 24b that contacts and presses against the fixed support portion 16. The fixed end 24a is formed on the base portion 21a within the first plate portion 21.

[0035] The arm portion 132c is always supported in a state where it is pressed against the fixed support portion 16a by the pressure of the elastic plate portion 24. Therefore, the position of the arm portion 132c (holder 132) can always be determined with reference to the fixed support portion 16a, and even if there is vibration due to the movement of the vehicle 100, for example, the position of the protruding piece 132a can be made less likely to shift. At the same time, the biasing force of the elastic plate portion 24 can suppress rattling of the arm portion 132c even when the vehicle vibrates, and blurring of the displayed image can be suppressed. In this way, the head-up display device (display device 102) of this embodiment can improve the positioning accuracy of the holder 132.

[0036] In particular, the elastic plate portion 24 is formed such that, within the plane of the first plate portion 21, the free end 24b is located further from the axis of rotation A than the fixed end 24a. The elastic plate portion 24 formed in this manner can more easily exert a strong elastic force. This is because the fixed support portion 16 is mounted on the holder 132 at a position relatively far from the rotation axis A (in this embodiment, the position furthest from the rotation axis A) in order to increase the torque applied to the holder 132 due to the driving force. When a drive device 1 is used, which often employs such a fixed support portion 16, if the free end 24b is formed closer to the rotation axis A than the fixed end 24a, the drive device 1 and the fixed end 24a will interfere with each other, leading to an unnecessarily large size of the device. On the other hand, as in this configuration, when the free end 24b is located outside the fixed end 24a, the fixed end 24a can be set to a relatively free position within the plane of the first plate portion. In addition, when it is provided near the end portion 210, the total length of the elastic plate portion 24 can be increased, the elastic force generated by the elastic plate portion 24 can also be increased, and the force with which the free end 24b presses against the fixed support portion 16b (i.e., the force that presses the arm portion 132c against the fixed end 16a) can be increased, which is preferable. A fixed end 24a is formed closer to the end portion 210 than the bent portion 22, and a free end 24b is formed closer to the bent portion 22 than the end portion 210.

[0037] The free end 24b has a guide 24c at its tip. The guide 24c is formed by bending the tip of the elastic plate portion 24 at the bent portion 24b in order to facilitate insertion into the fixed support portion 16 of the drive device 1 when inserting the arm portion 132c, to which the lever cover 20 is attached, into the fixed support portion 16 of the drive device 1.

[0038] The hook portion 21c is a catch that prevents the lever cover 20 from falling off. The hook portion 21c is formed by bending the folded portion 21b near the end portion 210. When the lever cover 20 shifts in the direction that would cause it to fall off, the hook portion 21c catches on the folded portion 132b (the upper end of the arm portion 132c), thereby preventing the lever cover 20 from falling off.

[0039] Furthermore, it is preferable that the hook portion 21c be formed at the end 210 of the first plate portion 21, which is longer than the arm portion 132c. That is, when the lever cover 20 is inserted deeply enough, the hook portion 21c does not cause any catching action. On the other hand, when the lever cover 20 is pulled toward the fixed support portion 16 due to the driving operation of the drive device 1, the lever cover 20 slides along the support portion 16 rather than the arm portion 132c. In this way, the lever cover 20 is configured to slide relative to the arm portion 132c during the driving operation by the drive device 1 while preventing it from falling off, thereby reducing the risk of rattling or abnormal noise occurring between the drive device 1 and the holder 132. In this configuration, it is preferable to interpose a material that improves sliding properties, such as grease, between the lever cover 20 and the arm portion 132c, and it is even better if grooves or the like are formed in the arm portion 132c to prevent such material from spilling out.

[0040] The bent portion 22 is shaped to connect the plate portions of the U-shaped lever cover 20. The bent portion 22 is shaped so that the first plate portion 21 and the second plate portion 23 are spaced apart by approximately the thickness of the arm portion 132c in order to sandwich the arm portion 132c. Therefore, the bent portion 22 does not necessarily have to be bent in shape; for example, it could be a connecting portion that links the first plate portion 21 and the second plate portion 23.

[0041] The second plate portion 23 forms the other end 230 of the lever cover 20 and is shaped to be opposite the first plate portion 21. Together with the first plate portion 21, the second plate portion 23 clamps the arm portion 132c, enabling the holder 132 to hold the lever cover 20.

[0042] The second plate portion 23 does not constitute an elastically supported portion, but also functions as a fixedly supported portion. The pressure from the elastic plate portion 24 positions the second plate portion 23 toward the fixedly supported portion 16a. Therefore, it is desirable that the second plate portion 23 be configured as a fixedly supported portion so that the relative position between the fixedly supported portion 16a and the arm portion 132c does not move.

[0043] The end portion 230 has a guide 23b that is formed to extend outwards from the U-shape of the lever cover 20. The guide 23b is formed by bending the end portion 230 of the second plate portion 23 at the bend portion 23a to facilitate insertion of the tip of the arm portion 132c between the plate portions when the lever cover 20 is attached.

[0044] As shown in Figure 6, the drive unit 1 rotates the holder 132 by moving the support part 16. Figure 6 illustrates the transition of the holder 132 from the first position P1 (dotted line) to the second position P2 (solid line). Hereinafter, the state indicated by the dotted line will be referred to as the first state, and the state indicated by the solid line will be referred to as the second state.

[0045] The first position P1 is also called the parking position. In the first state, the display light L is not projected onto the windshield 103. That is, in the first state, no display with a normal virtual image is performed. This mode is used, for example, when the display of a virtual image is stopped due to the vehicle 100's power being stopped, the vehicle 100 being stopped, or some malfunction occurring in the head-up display device (display device 102).

[0046] The second position P2 is also called the display position. In the second state, the display light L performs a display accompanied by a normal virtual image. As mentioned above, in the second position P2, multiple positions of the holder 132 may be set according to the height of the driver's 104's viewpoint. These positions may include a toler position for drivers with a high viewpoint, a shorter position for drivers with a low viewpoint, and a nominal position for drivers with an average viewpoint.

[0047] As shown in Figure 6, the arm portion 132c, in particular, in the first state, has a surface shape that follows a plane (double dashed line in the figure) perpendicular to the direction of movement of the movable member 15 (single dashed line in the figure). In a head-up display device configured in this way, the holder 132 can be assembled with the parking position as the initial state during manufacturing, and in that state, the arm portion 132c can be inserted into the fixed support portion without tilting, thus offering excellent manufacturability.

[0048] As shown in Figure 6, the amount of deflection (deformation due to elastic deformation) of the elastic plate portion 24 is set to be larger in the second state than in the first state. Generally, in the second state, a display accompanied by a normal virtual image is performed, making it easier for the driver to perceive the vibration of the second reflector. In addition, in the second state, the vehicle 100 is often in motion, which makes vibration of the second reflector more likely to occur. Therefore, the elastic plate portion 24 is configured to press the fixed support portion 16b with a stronger elastic force in such a state (second state) compared to the first state. With this configuration, the risk of the driver 104 perceiving the shaking of the holder 132 (second reflector 130) as shaking of the virtual image V during actual use can be reduced.

[0049] (Example of effect) The head-up display device (display device 102) in the first aspect of this disclosure is A head-up display device (display device 102) that displays a virtual image V by projecting display light L onto a windshield 103, A liquid crystal display 110 that emits display light L, A concave mirror 131 that reflects the display light L, A holder 132 that holds the concave mirror 131, A case that rotatably holds the holder 132, The holder 132 has a support portion 16 that supports the elastic plate portion 24 formed on the holder 132, and a drive device 1 that rotates the holder 132. The elastic plate portion 24 is elastic and presses against the support portion 16.

[0050] With this configuration, the rotatable reflector is equipped with an elastic support section, allowing it to constantly exert elastic force even if the reflector's orientation (position) changes. In other words, this configuration makes it easier to constantly position the reflector 130, and consequently suppresses blurring of the displayed image.

[0051] In the first embodiment, the head-up display device (display device 102) of the second embodiment is, The drive unit 1 has a movable member 15 that moves in a straight line and forms a support portion 16. The support portion 16 is provided at two locations (fixed support portions 16a, 16b) opposite to each other in the direction of movement. The elastic plate portion 24 presses against one of the fixed support portions 16b, thereby pressing the holder 132 against the other fixed support portion 16a.

[0052] This configuration makes it easier to constantly position the reflector 130 on the support part 16, thereby suppressing blurring of the displayed image.

[0053] In the first embodiment, the head-up display device (display device 102) of the third embodiment is, The drive unit 1 rotates the holder 132 between a first position P1 in which the indicator light L does not reach the windshield 103 and a second position P2 in which the indicator light L reaches the windshield 103. The elastic plate portion presses the support portion 16 with a greater elastic force when the holder 132 is in the second position P2 than when it is in the first position P1.

[0054] This configuration allows for more secure positioning of the reflector 130, further suppressing blurring of the displayed image.

[0055] In the first embodiment, the head-up display device (display device 102) of the fourth embodiment is, The elastic plate portion 24 is an elastically supported portion, The elastic plate portion 24 has a fixed end 24a whose relative position is fixed to the holder 132, and a free end 24b that presses against the support portion 16. The free end 24b is located further from the rotation axis A of the holder 132 than the fixed end 24a.

[0056] This configuration makes it easy to increase elastic force and strengthen positioning, thereby suppressing blurring of the displayed image.

[0057] In the fourth embodiment, the head-up display device (display device 102) of the fifth embodiment is: The holder 132 has a base for holding the concave mirror 131, an arm portion 132c extending from the base, and a U-shaped lever cover 20 formed by a first plate portion 21, a second plate portion 23, and a folding portion 22 connecting the first plate portion 21 and the second plate portion 23. The lever cover 20 is held in place by the first plate portion 21 and the second plate portion 23 sandwiching the arm portion 132c. The elastic plate portion 24 is formed on the first plate portion 21.

[0058] By configuring it in this way, the elastic arm 24, which is the elastically supported part, can be mounted simply by attaching the U-shaped (clip-shaped) member to the arm 132c, making it easier to suppress blurring of the displayed image.

[0059] In the fifth embodiment, the head-up display device (display device 102) of the sixth embodiment is: The lever cover 20 is slidably held relative to the arm portion 132c in the plane direction along which the first plate portion 21 and the second plate portion 23 are aligned.

[0060] This configuration suppresses the occurrence of abnormal noises and rattling while also reducing image blurring.

[0061] In the fifth embodiment, the head-up display device (display device 102) of the seventh embodiment is: The drive unit 1 has a movable member 15 that moves in a straight line and forms a support portion 16. The arm portion 132c is formed so as to be perpendicular to the direction of movement when the holder 132 is in the first position P1.

[0062] This configuration makes it easier to insert (install, set) the arm portion 132c into the support portion 16 during manufacturing, thereby improving manufacturability while suppressing blurring of the displayed image.

[0063] The head-up display device according to the first embodiment has been described above.

[0064] (modified version) As described above, according to the present invention, when an image can be viewed by both a primary and a secondary viewer, it is possible to provide a display with reduced distortion not only for the primary viewer but also for the secondary viewer.

[0065] In the first embodiment, the arm portion 132c is shown to be pressed against the fixed support portion 16b by the elastic force of the elastic support portion, but the arm portion 132c (and by extension the holder 132, reflector 130) may be pressed against the housing 140 or the like.

[0066] In this specification, the term "vehicle" can be interpreted broadly as a means of transportation. Similarly, terms related to navigation (e.g., signs) will also be interpreted broadly, taking into consideration, for example, broad navigation information useful for the operation of a vehicle. Furthermore, HUD devices will include those used as simulators (e.g., aircraft simulators or simulators used as gaming devices).

[0067] The present invention is not limited to the exemplary embodiments described above, and those skilled in the art will be able to easily modify the exemplary embodiments described above to the extent included in the claims. [Explanation of symbols]

[0068] 102 Display device (an example of a head-up display device) 103 Windshield (an example of a projected element) 104 Driver 110 LCD display 120 First reflector 130. Second reflector (an example of a mirror) 131 Concave mirror 132 Holder 132a Protrusion 132b Folded section 132c arm 140 Housing 1. Drive unit 11 Drive unit 12 Lead Screws 13 Guide shaft 14 frames 15 Main body 16 Support part 16a,16b Fixed support part 20 Lever cover 21 First plate section 22. Folding section (an example of a connecting section) 23 Second plate section 24. Elastic plate section (an example of an elastically supported section) L display light V virtual image, 1. Drive unit G Gap

Claims

1. A head-up display device that displays a virtual image by projecting display light onto a projection target, A display that emits the aforementioned display light, A mirror that reflects the aforementioned display light, A holder for holding the aforementioned mirror, A case that rotatably holds the holder, The holder has a support portion that supports the supported portion formed on the holder, and a drive device that rotates the holder, The drive device has a movable member that moves in a straight line and forms the support portion, The support portion is provided at two locations opposite each other in the direction of movement. The supported portion is rotatable integrally with the holder and is elastic, and by pressing one of the supported portions, it presses the holder against the other supported portion. Head-up display device.

2. The drive device rotates the holder between a first position in which the indicator light does not reach the projected member and a second position in which the indicator light reaches the projected member. The supported portion presses against the support portion with a greater elastic force when the holder is in the second position than when the holder is in the first position. The head-up display device according to claim 1.

3. The supported portion is an elastic plate portion, The elastic plate portion has a fixed end that is fixed in a constant relative position to the holder, and a free end that presses against the support portion. The free end is provided at a location further from the rotation axis of the holder than the fixed end. The head-up display device according to claim 1.

4. The aforementioned holder is, The base for holding the mirror, An arm portion extending from the base, A U-shaped lever cover formed by a first plate portion, a second plate portion, and a connecting portion that connects the first plate portion and the second plate portion. It has, The lever cover is held in place by the first plate portion and the second plate portion sandwiching the arm portion. The supported portion is formed on the first plate portion. The head-up display device according to claim 3.

5. The lever cover is held slidably with respect to the arm in the direction along which the first plate portion and the second plate portion are aligned. The head-up display device according to claim 4.

6. The drive device rotates the holder between a first position in which the indicator light does not reach the projected member and a second position in which the indicator light reaches the projected member. The arm portion is formed so as to be perpendicular to the direction of movement when the holder is in the first position. The head-up display device according to claim 4.

Images