Head-up display device

Abstract

High luminance efficiency is achieved for light rays from both light sources. [Solution] The system includes a movable compensating mirror 130 that is rotatable between a reflection position, which is located on the optical path of the display light L1 representing the virtual image IMG1 and reflects the display light L2 representing the real image IMG2 toward the windshield 30, and a retraction position, which is moved away from the optical path of the display light L1 representing the virtual image IMG1; and a drive mechanism 133 that drives the movable compensating mirror 130 to rotate between the reflection position and the retraction position. The liquid crystal display panel 111 is positioned on the opposite side of the reflective surface of the movable compensating mirror 130. When the movable compensating mirror 130 is rotated to the reflection position, it emits the display light L2 toward the windshield 30, allowing the driver 40 to see the real image IMG2. When the movable compensating mirror 130 is rotated to the retraction position, it emits the display light L1 toward the windshield 30, allowing the driver 40 to see the virtual image IMG1.

Description

Technical Field

[0001] The present invention relates to a head-up display device that performs a desired display for a viewer.

Background Art

[0002] Conventionally, for example, a head-up display device described in Patent Document 1 is known. This head-up display device has two displays, and by transmitting the display light of one display through a half mirror and reflecting the display light of the other display with a half mirror, the optical path lengths to their respective front glasses are made different, and two virtual images corresponding to the two display lights are made visible to the driver.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above conventional head-up display device, for the display light from the light source of one display, only the reflectance of the half mirror is reflected, so a sufficient amount of light cannot be emitted. Also, for the display light from the light source of the other display, only the transmittance of the half mirror is transmitted, so a sufficient amount of light cannot be emitted. As a result, there is a problem that the luminance efficiency of any display light deteriorates.

[0005] Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a head-up display device capable of obtaining high luminance efficiency in both light rays from two light sources.

Means for Solving the Problems

[0006] The present invention relates to a head-up display device 100 having an emission port 17, which emits display lights M1, L1 / M2, L2 from the emission port 17 toward a light-transmitting member 30 to allow a vehicle driver 40 to view the display images IMG2, IMG1 represented by the display lights M1, L1 / M2, L2, the head-up display device 100 having an emission port 17, which emits display lights M1, L1 / M2, L2 toward a light-transmitting member 30, the head-up display device 100 comprising: a first display unit 121 equipped with a first display element that transmits light emitted from a first light source 125 and displays a first display image IMG2; a second display unit 111 equipped with a second display element that transmits light emitted from a second light source 115 and displays a second display image IMG1; and a reflection position located on the optical path of the second rays M1, L1 representing the second display image IMG1 displayed in the second display unit 111, which reflects the first rays M2, L2 representing the first display image IMG2 displayed in the first display unit 121 toward the light-transmitting member 30. A head-up display device 100 comprising: a first mirror 130 configured to be rotatable between a reflection position and a retracted position where it is moved out of the optical path of the second rays M1 and L1; and a drive unit 133 that drives the first mirror 130 to rotate between the reflection position and the retracted position, wherein the second display unit 111 is positioned on the opposite side of the reflective surface of the first mirror 130 in the reflection position, and when the first mirror 130 is rotated to the reflection position, the first rays M2 and L2 are emitted to the light-transmitting member 30, thereby allowing the driver 40 to view the first display image IMG2, and when the first mirror 130 is rotated to the retracted position, the second rays M1 and L1 are emitted to the light-transmitting member 30, thereby allowing the driver 40 to view the second display image IMG1. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a head-up display device that can obtain high brightness efficiency from both light rays from two light sources. [Brief explanation of the drawing]

[0008] [Figure 1] A conceptual diagram showing the placement of a head-up display device according to one embodiment of the present invention in a vehicle. [Figure 2]A schematic cross-sectional view showing the overall configuration of a head-up display device. [Figure 3] A schematic cross-sectional view illustrating the display state of a virtual image in a head-up display device. [Figure 4] A schematic cross-sectional view illustrating the display state of a real image in a head-up display device. [Modes for carrying out the invention]

[0009] Hereinafter, a head-up display device according to one embodiment of the present invention will be described with reference to Figures 2 to 1. As shown in Figure 1, the head-up display device 100 according to this embodiment is positioned below the windshield 30 of the vehicle 10 (for example, inside the instrument panel (hereinafter referred to as the instrument panel as appropriate)), and allows the driver 40 to view a real image IMG2 on the inside of the vehicle with the windshield 30 (translucent member) in between, and a virtual image IMG1 on the outside of the vehicle.

[0010] <Overview of a head-up display device> Figure 2 shows the overall configuration of the head-up display device 100 according to this embodiment. In Figure 2, the head-up display device 100 comprises a first display unit 120, a second display unit 110, a reflector unit 13, and a control device 15, all of which are housed in a housing 160.

[0011] <Housing> The housing 160 has an upper case 161 and a lower case 162. The upper case 161 is provided with an opening 17 (emission outlet) from which the display lights L1 and L2 described later are emitted, and the opening 17 is provided with a window portion 163 for protecting the interior. The window portion 163 is made of a light-transmitting resin (for example, acrylic) and in this example has a curved shape.

[0012] Furthermore, the upper case 161 is provided with a light-shielding wall 161a to prevent the phenomenon of washout, where external light other than sunlight enters the first display unit 110 and the second display unit 120, making the virtual image IMG1 and the real image IMG2 difficult to see. The light-shielding wall 161a is flat and is formed to hang diagonally from the top of the upper case 161.

[0013] <First display unit> The first display unit 120 includes a light-emitting diode 125 (first light source), a liquid crystal display panel 121 (first display unit) provided on the side of the opening 17 along the optical path from the light-emitting diode 125, lens members 122, 123, 124, a rigid wiring board 126, a case body 127, and a heat sink 128.

[0014] The light-emitting diode 125 emits light in the visible wavelength range, such as white light. Multiple light-emitting diodes 125 are arranged in close proximity to each other and mounted on a rigid wiring board 126. The lens member 122 has multiple convex lens portions 122a. Each convex lens portion 122a is provided at a location corresponding to the light-emitting diode 125 and focuses the light emitted by the light-emitting diode 125.

[0015] The liquid crystal display panel 121 has a TFT (Thin Film Transistor) type first display element (not shown) that transmits light M2 emitted from the light-emitting diode 125 and transmitted through lens members 122, 123, and 124 to generate display light L2, and displays the above-mentioned real image (first display image) IMG2, which is a display image formed in front of the driver 40. The first display element can form display light representing any image according to the control signal sent from the control device 15.

[0016] The case body 127 is made of resin, and a liquid crystal display panel 121 is provided at the open end of this case body. The heatsink 128 is located on the rear surface of the rigid wiring board 126. The heatsink 128 dissipates the heat generated by the light-emitting diode 125.

[0017] <Second display> The second display 110 includes a light-emitting diode 115 (second light source), a liquid crystal display panel 111 (second display unit) provided closer to the opening 17 side than the light-emitting diode 115 along the optical path, lens members 112, 113, 114, a rigid wiring board 116, a display holder 117, and a case body 118.

[0018] The light-emitting diode 115 emits light in the visible wavelength range, for example, white light. A plurality of light-emitting diodes 115 are arranged close to each other and mounted on the rigid wiring board 116. The lens members 112, 113, 114 are made of a light-transmitting resin such as polycarbonate and are arranged between the liquid crystal display panel 111 and the light-emitting diode 115. The lens member 112 has a plurality of convex lens portions 112a. Each convex lens portion 112a is provided at a location corresponding to the light-emitting diode 115 and condenses the light emitted by the light-emitting diode 115.

[0019] The liquid crystal display panel 111 has a TFT-type second display element (not shown), transmits the light M1 emitted from the light-emitting diode 115 and transmitted through the lens members 112, 113, 114 to generate display light L1, and displays a virtual image (second display image) IMG1 that is a display image formed in front of the driver 40. The second display element can form display light representing an arbitrary image according to a control signal sent from the control device 15. The liquid crystal display panel 111 is held and arranged in front of the opening of the case body 118 by the display holder 117.

[0020] The case body 118 is made of a black resin and has a substantially rectangular tube shape.

[0021] Note that the liquid crystal display panel 111 of the second display 110 is arranged closer to the opening 17 side than the position of the second optical focus F2 of the imaging optical system including the windshield 30 and the reflector 140 described later along the optical path of the display light L1 (in the order of the optical path).

[0022] Furthermore, in Figure 2, although countless light rays (display light) are actually emitted from both the liquid crystal display panel 121 and the liquid crystal display panel 111, here, the strongest light ray emitted from the center of the liquid crystal display panel 121 and passing through the center of the eye box is shown as the representative light ray, display light L2, and the strongest light ray emitted from the center of the liquid crystal display panel 111 and passing through the center of the eye box is shown as the representative light ray, display light L1. In Figure 2, for convenience, display light L2 is shown as a solid line and display light L1 is shown as a dashed line. Furthermore, in the first display unit 120 and the second display unit 110, optical components such as condenser lenses, lenticular lenses, diffusers, and polarizers may be placed at any position downstream of the respective light-emitting diodes 125 and 115.

[0023] <Reflector> The reflective section 13 reflects the display light L2, which represents the display image displayed on the liquid crystal display panel 121, and the display light L1, which represents the display image displayed on the liquid crystal display panel 111, toward the windshield 30. This reflective section 13 comprises a first mirror section 13a and a second mirror section 13b.

[0024] <First Mirror Section> The first mirror section 13a includes a reflector 150 that reflects the display light L2 emitted from the liquid crystal display panel 121 toward the movable correcting mirror 130, and a movable correcting mirror 130 (first mirror) that reflects the display light L2 emitted from the reflector 150 toward the second mirror section 13b. The reflector 150 and the movable correcting mirror 130 have mirror surfaces and are complex free-form shapes to correct the distortion of the display light L2 and correct the distortion of the image seen by the driver 40.

[0025] <Reflector> The reflector 150 is positioned along the optical path of the display light L2 (in optical path order) on the aperture 17 side of the first display unit 120, and has a concave mirror (not shown) and a mirror holder (not shown), with the mirror holder holding the concave mirror. As shown in Figure 2, the reflector 150 is positioned on the first display unit 120 side of the first optical focus F1 of the imaging optical system, which includes the window shield 30, the movable compensating mirror 130, and the reflector 140. The reflector 150 then reflects the display light L2 emitted from the liquid crystal display panel 121 and reflected by the movable compensating mirror 130 at the above reflection position toward the movable compensating mirror 130 located above the reflector 150.

[0026] <Adjustable corrective mirror> The movable correcting mirror 130 comprises a concave mirror 131 (mirror body) and a mirror holder 132 (holder) that houses and holds the concave mirror 131.

[0027] The concave mirror 131 is made of a high-reflectivity mirror that reflects approximately 97% of the incident light, for example, by forming a coating by sputtering. Alternatively, the concave mirror 131 may be made of a clear mirror that reflects approximately 90% of the incident light.

[0028] The mirror holder 132 is configured to rotate around the substantially horizontal axis of the drive mechanism 133 (drive unit) between the reflection position shown by the solid line and the retracted position shown by the dashed line in Figure 2, by the drive mechanism 133 (drive unit). The reflection position is the position where the movable compensating mirror 130 is located on the optical path of the display light L1, causing the display light L1 to strike the back surface of the mirror holder 132, and also reflecting the display light L2 toward the reflector 140. The retracted position is the position where the movable compensating mirror 130 is located off the optical path of the display light L1, allowing the display light L1 to pass through, and also reflecting the display light L2 toward the reflector 150. The mirror holder 132 is provided with a contact portion 132b, which, when rotated by the drive mechanism 133, contacts the stopper portion 162a formed by the casing contact surface to position the movable compensating mirror 130 (see Figure 2), and this contact state becomes the reflection position.

[0029] The drive mechanism 133 includes, for example, a gearbox (not shown) and a motor (not shown), and is connected to the shaft 132a of the mirror holder 132 via an appropriate coupling or the like. In this example, the shaft 132a is positioned at the lower end of the mirror holder 132, which allows the entire concave mirror 131 to be positioned on or completely out of the optical path of the display light L1 (second ray) by rotation. In other words, if the shaft 132a were positioned at the center of the mirror holder 132, the entire concave mirror 131 would not be able to be completely out of the optical path of the display light L1, so this is avoided.

[0030] When the movable compensating mirror 130 is in the reflection position described above, it reflects the display light L2 (first ray) from the approximately vertical direction reflected by the reflector 150 back toward the reflector 140. When the movable compensating mirror 130 is in the reflection position described above, the second display unit 110, which has a liquid crystal display panel 111, is located on the opposite side from the reflective surface of the concave mirror 131 of the movable compensating mirror 130. When the movable compensating mirror 130 is in the retracted position described above, the first display unit 120 is basically not displayed. However, even if it were to be displayed, the display light L1 representing the virtual image IMG1 displayed on the liquid crystal display panel 111 does not pass through the movable compensating mirror 130.

[0031] <Second Mirror Section> The second mirror section 13b has a reflector 140 whose surface is made of mirror material.

[0032] <Reflector> The reflector 140 is configured to be rotatable and includes a concave mirror 141 that reflects indicator lights L1 and L2 and projects them onto the windshield of the vehicle, a mirror holder 142 that holds the concave mirror 141, and a drive mechanism 143.

[0033] The concave mirror 141 has a free-form surface and is formed by depositing aluminum (Al) onto a resin such as polycarbonate (PC) to create a reflective film. The mirror holder 142 is made of a resin such as PBT. The concave mirror 141 and mirror holder 142 may also be made of a metal such as aluminum.

[0034] The drive mechanism 143 includes a linear guide 143a and a motor 143b. The linear guide 143a is fastened to a fitting portion 142a provided on the mirror holder 142, and when the motor 143b is driven, the arrangement angle of the concave mirror 141 held in the mirror holder 142 is adjusted, thereby adjusting the projection direction of the display lights L1 and L2.

[0035] The reflector 140 reflects the display light L2 that has been reflected and folded back by the movable correcting mirror 130 at the above reflection position, or the display light L1 that has entered from the liquid crystal display panel 111 without passing through the movable correcting mirror 130, toward the upper opening 17. The display light L2 or display light L1 reflected by the reflector 140 is then emitted to the windshield 30 through the window 163, and the driver 40 views the display image represented by the display light L2 as a real image IMG2, or the display image represented by the display light L1 as a virtual image IMG1.

[0036] In particular, the reflector 140 is rotated by the drive mechanism 143 to match the position of the driver's eyes 40, and the direction of emission of the display light L2 and display light L1 is freely changed to adjust the position of the image. For example, it may be desirable to have different display angles when display light L2 displays a real image IMG2 and when display light L1 displays a virtual image IMG1. For instance, one might want to display the virtual image IMG1 as if it were tilted relative to the road surface, while displaying the real image IMG2 as if it were standing perpendicular to the road surface. In response to this, by performing the above adjustment by rotating the drive mechanism 143, it becomes possible to display the images at angles suitable for the real image IMG2 and the virtual image IMG1, respectively.

[0037] <Control device> The control device 15 functionally comprises a correcting mirror control unit 15A and a concave mirror control unit 15B.

[0038] The correcting mirror control unit 15A can fine-tune the uniformity and position of the real image IMG2 by fine-tuning the angle of the concave mirror 131 via the drive mechanism 133. The concave mirror control unit 15B can adjust the projection direction of the display lights L1 and L2 by adjusting the arrangement angle of the concave mirror 141 via the drive mechanism 143 as described above.

[0039] In addition to the above, the control device 15 also has the function of controlling the display content and display switching of the liquid crystal display panel 121 and the liquid crystal display panel 111 (detailed explanation omitted). In other words, although a detailed explanation is omitted, the control device 15 controls the first display unit 120 and the second display unit 110 in coordination, and generates display light L2 emitted from the first display unit 120 and display light L1 emitted from the second display unit 110 by turning the light-emitting diode 125 on / off, turning the light-emitting diode 115 on / off, and controlling the display content of the liquid crystal display panel 121 and the display content of the liquid crystal display panel 111.

[0040] <Representation of Real and Virtual Images> With the head-up display device configured as described above, the driver 40 of the vehicle 10 can see the real image IMG2 on the inside of the vehicle, across the windshield 30, that is, on the side of the windshield 30 in front of the driver 40, by viewing the display light L2 reflected off the windshield 30. The driver 40 can also see the virtual image IMG1 on the outside of the vehicle, across the windshield 30, that is, on the side of the windshield 30 in front of the driver 40, by viewing the display light L1 reflected off the windshield 30.

[0041] Figure 3 shows the state in which the head-up display device 100 is displaying a virtual image IMG1 on the second display unit 110. As mentioned above, in this case, the correcting mirror control unit 15A of the control device 15 controls the drive mechanism 133 so that the movable correcting mirror 130 rotates counterclockwise as shown in the figure, with the center of the shaft 132a as the axis, until just before it hits the lower case 162, and moves out of the optical path of the display light L1 to a retracted position. At this time, the mirror holder 132 may be provided with a stopper part (not shown) that protrudes toward the concave mirror 131 and hits the lower case 162. As a result, as mentioned above, the display light L1 representing the virtual image IMG1 displayed on the liquid crystal display panel 111 does not pass through the movable corrector mirror 130. The display light L1 that enters the reflector 140 from the liquid crystal display panel 111 without passing through the movable corrector mirror 130 is reflected toward the opening 17 and emitted to the windshield 30, allowing the driver 40 to see the display image represented by the display light L1 as the virtual image IMG1.

[0042] Furthermore, the virtual image IMG1 displays information that is highly necessary to draw the driver's attention, such as vehicle information like the vehicle's speed and engine RPM, route guidance displays such as turn-by-turn directions and maps, blind spot indicators, and warning displays such as speed limit exceeding warnings. These displays provide a driving environment that reduces the need for eye movement and adjustment of the eye's focal length.

[0043] Figure 4 shows the state in which the head-up display device 100 is displaying a real image IMG2 on the first display unit 120. As mentioned above, in this case, the correcting mirror control unit 15A of the control device 15 controls the drive mechanism 133 so that the movable correcting mirror 130 rotates in the clockwise direction shown in the figure (until the contact portion 132b of the mirror holder 132 hits the stopper portion 162a) with the center of the shaft 132a as the axis, and is positioned with high precision to the reflection position on the optical path of the display light L1. As a result, as described above, the display light L2 representing the real image IMG2 displayed on the liquid crystal display panel 121 is reflected and folded back by the movable correcting mirror 130 at the reflection position, and then reflected again by the reflector 140 toward the upper opening 17. The display light L2 reflected by the reflector 140 is then emitted to the windshield 30 through the window section 163, and the driver 40 can see the display image represented by the display light L2 as the real image IMG2.

[0044] In addition, the actual image IMG2 will display, for example, entertainment content, assistants or agents that support the driver 40, and characters representing them, on the side of the windshield 30 that is in front of the driver 40.

[0045] Furthermore, the real image IMG2 and virtual image IMG1 include not only the text and icons that indicate the above information, but also a background area, which, in a plan view from the driver 40, forms, for example, a roughly rectangular shape.

[0046] <Effects of the Embodiment> As described above, in this embodiment, the movable correcting mirror 130 is configured to rotate between a reflection position and a retracted position when driven by the drive mechanism 133. When the driver 40 is to view the real image IMG2, the movable corrector mirror 130 is rotated to a reflective position so that it is positioned in the optical path of the display light L1 from the second display unit 110, and the display light L2 from the first display unit 120 is reflected and emitted onto the windshield 30. As a result, a sufficient amount of light can be emitted compared to using a half mirror in the movable corrector mirror 130 to reflect only a predetermined amount of the display light L2 from the first display unit 120. On the other hand, when the driver 40 is to view the virtual image IMG1, the movable corrector mirror 130 is rotated to the retracted position to deviate the display light L1 out of the optical path, allowing the display light L1 from the second display unit 110 to be emitted to the windshield 30. As a result, a sufficient amount of light can be emitted compared to using a half mirror in the movable corrector mirror 130 to transmit only the amount of the display light L1 from the second display unit 110 that is limited by its transmittance. As a result of the above, according to this embodiment, high brightness efficiency can be obtained for both the display light L2 from the first display unit 120 and the display light L1 from the second display unit 110. Furthermore, since power consumption can be reduced, there is also the effect of miniaturizing the head-up display device 100 by reducing power consumption and the size of the light source that emits the display light.

[0047] Furthermore, in this embodiment in particular, when displaying the real image IMG2, it can be projected into the window shield 30 via the path from the first display unit 120 → reflector 150 → movable correcting mirror 130 in the reflection position → reflector 140 → opening 17, and when displaying the virtual image IMG1, it can be projected into the window shield 30 via the path from the second display unit 110 → (bypassing the movable correcting mirror 130 in the retracted position) → reflector 140 → opening 17.

[0048] Furthermore, in this embodiment in particular, when rotating the movable correcting mirror 130 from the retracted position to the reflection position, the stopper portion 162a can be used for positioning, which allows the use of a low-precision and inexpensive motor in the drive mechanism 133.

[0049] Furthermore, in this embodiment in particular, the movable correcting mirror 130 can be rotated between the reflection position and the retracted position by driving the mirror holder 132, which houses the concave mirror 131, with the drive mechanism 133.

[0050] Furthermore, in this embodiment, the movable correcting mirror 130 has a function to correct the distortion of the display light L1, and the concave mirror 141 of the reflector 140 has a free-form surface, thereby improving the image quality of the real image IMG2 and the virtual image IMG1.

[0051] It should be noted that the present invention is not limited to the embodiments described above, and various modifications are possible without departing from its spirit and technical concept.

[0052] (1) When the reflector 140 is omitted In the above embodiment, a reflector 140 is provided between the movable correcting mirror 130 and the aperture 170 along the optical path of the display lights L2 and L1, and the display lights L2 and L1 from the movable correcting mirror 130 are reflected toward the aperture 17. However, the present invention is not limited to this configuration. That is, the present invention can also be applied to configurations that do not include the above reflector 140, such as the one described in Japanese Utility Model Publication No. 63-164038, and the same effects as in the above embodiment can be obtained.

[0053] In other words, in this case, when displaying a virtual image, as described above, the movable corrector mirror 130 is retracted to the retracted position by the control of the corrector mirror control unit 15A of the control device 15, and the display light L1 representing the virtual image IMG1 displayed on the liquid crystal display panel 111 is emitted to the windshield 30 through the opening 17 without passing through the movable corrector mirror 130, and the driver 40 can see the display image represented by the display light L1 as the virtual image IMG1.

[0054] When displaying a real image, the movable corrector mirror 130 is set to the reflection position by the control of the corrector mirror control unit 15A of the control device 15, and the display light L2 representing the real image IMG2 displayed on the liquid crystal display panel 121 is reflected by the movable corrector mirror 130. The display light L2 reflected and folded back by the movable corrector mirror 130 in the reflection position is emitted to the windshield 30 through the opening 17, and the driver 40 can see the display image represented by the display light L2 as the real image IMG2.

[0055] (2) Others The horizontal and vertical directions mentioned above are shown with reference to the horizontal and vertical directions of the vehicle 10, but the reference for each direction is not limited to these. This disclosure also includes cases where the entire device is tilted at a predetermined angle while the overall arrangement of each optical component maintains a relative positional relationship, depending on the internal shape of the instrument panel and the external shape of the housing 160.

[0056] In addition to what has already been described above, the methods described in the above embodiments and their respective modifications may be used in appropriate combinations.

[0057] Furthermore, although not to be exemplified individually, the present invention may be implemented with various modifications without departing from its spirit. [Explanation of symbols]

[0058] 10 vehicles 13 Reflector 13a First Mirror Section 13b Second Mirror Section 15 Control device 15A Correction Mirror Control Unit 15B Concave mirror control unit 17 Opening (injection port) 30 Window shield (light-transmitting material) 40 Driver 100 Head-Up Display Devices 110 Second display unit 111 Liquid crystal display panel (second display unit) 112 Lens component 112a Convex lens section 113 Lens component 114 Lens component 115 Light-emitting diode (second light source) 116 Rigid wiring board 117 Display holder 118 Case Body 120 First display unit 121 Liquid crystal display panel (first display unit) 122 Lens components 122a Convex lens section 123 Lens component 124 Lens components 125 Light-emitting diode (first light source) 126 Rigid wiring board 127 Case Body 128 Heatsink 130 Movable correcting mirror (first mirror) 131 Concave mirror (mirror body) 132 Mirror Holder (Holder) 132a Shaft 132b Contact part 133 Drive mechanism (drive unit) 140 Reflector 141 Concave mirror 142 Mirror Holder 142a Fitting part 143 Drive mechanism 143a Linear Guide 143b Motor 150 reflector 160 Housing 161 Upper case 161a Light-blocking wall 162 Lower case 162a Stopper part 163 Window section 170 Opening F1 1st optical focus F2 2nd optical focus IMG1 Virtual image (second display image) IMG2 Real image (first display image) L1 display light (second light beam) L2 display light (first ray) M1 Display light (second light beam) M2 Display light (1st ray)

Claims

1. A head-up display device having an emission port, which emits display light from the emission port toward a light-transmitting member, thereby allowing the driver of a vehicle to view the display image represented by the display light, A first display unit comprising a first display element that transmits light emitted from a first light source and displays a first display image, A second display unit is provided with a second display element, which transmits light emitted from a second light source and displays a second display image. A first mirror is located on the optical path of a second ray representing the second display image displayed on the second display unit, and is configured to be rotatable between a reflection position that reflects a first ray representing the first display image displayed on the first display unit toward the light-transmitting member, and a retraction position that moves away from the optical path of the second ray, A head-up display device having a drive unit that drives the first mirror to rotate it between the reflection position and the retracted position, The second display unit is positioned on the opposite side from the reflective surface of the first mirror at the reflection position. When the first mirror is rotated to the reflective position, the first light ray is emitted to the light-transmitting member, thereby allowing the driver to see the first display image. When the first mirror is rotated to the retracted position, the second light ray is emitted to the light-transmitting member, thereby allowing the driver to see the second display image. A head-up display device characterized by the following features.

2. The device further includes a second mirror which, when the first mirror is rotated to the reflection position by the drive unit, reflects the first light ray reflected by the first mirror toward the emission port, and when the first mirror is rotated to the retracted position by the drive unit, reflects the second light ray from the second display unit toward the emission port. When the first mirror is rotated to the reflection position, the second mirror reflects the first light ray emitted from the first display unit and reflected by the first mirror toward the light-transmitting member, thereby allowing the driver to see the first display image. When the first mirror is rotated to the retracted position, the second mirror reflects the second light ray from the second display unit toward the light-transmitting member, thereby allowing the driver to see the second display image. The head-up display device according to claim 1, characterized in that it is the same as described in claim 1.

3. The device further includes a stopper portion that contacts the first mirror and positions it in the retracted position when the first mirror is driven by the drive unit from the reflection position toward the retracted position. The head-up display device according to claim 2, characterized in that it is as described above.

4. The first mirror is, The mirror body and The mirror body is housed in and held by a holder that is rotatable around a substantially horizontal axis, The aforementioned drive unit is The holder is equipped with a motor for rotating it. The head-up display device according to claim 1, characterized in that it is the same as described in claim 1.

5. The first mirror includes a corrective mirror for correcting the distortion of the display light, The second mirror includes a concave mirror with a free-form surface. The head-up display device according to claim 2, characterized in that it is as described above.

6. The first display image is a real image, and the second display image is a virtual image. The head-up display device according to claim 1, characterized in that it is the same as described in claim 1.

Images