Head-up display device

Abstract

To provide a head-up display device that is constructed in a compact size by bending a beam of light emitted from a light source.SOLUTION: The present invention comprises: a first display unit 12a for passing light emitted by a first light source 11a through and displaying the real image RI of a display image; a reflection unit 13 for reflecting a first beam B1 representing the real image RI toward a windshield WS; and an optical axis bending member 14 which accepts a first beam B1 as input, and which bends the first optical axis S1 of the first beam B1 at a prescribed angle and emits it as a second optical axis S2 to the first display unit 12a. The reflection unit 13 includes a first mirror unit 13a that reflects and returns the first beam B1, and a second mirror unit 13b that reflects the first beam B1 from the first mirror unit 13a toward the windshield WS. The second mirror unit 13b is located so that a section of it is included in a first virtual area A1 created by virtually moving the first display unit 12a in parallel along the second optical axis S2 to the side opposite the first mirror 13a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a head-up display device that provides a desired display to a driver and has a compact structure. [Background technology]

[0002] A head-up display device described in Patent Document 1, for example, is known from the past. This display device emits display light representing an image toward the windshield of a vehicle, and displays a virtual image of the image by the display light reflected by the windshield. The display device includes a display unit, a folding mirror member, a mirror unit, a motor, a conversion mechanism, a housing, and a control unit, and the display unit emits display light representing a predetermined image. The display light emitted from the display unit is reflected and magnified by a mirror unit having a concave mirror, allowing the viewer to view a virtual image in the distance through the windshield. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-148434 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned conventional head-up display devices, if the angle of view of the virtual image is increased, the concave mirror and the display unit (such as a liquid crystal display panel within the display unit) become larger, which in turn increases the size of the housing, resulting in the problem of interference with vehicle parts inside the instrument panel located below the head-up display device.

[0005] Therefore, the present invention has been made in consideration of the above problems, and aims to provide a compact head-up display device that does not interfere with vehicle parts, etc. by bending the light beam emitted from the light source. [Means for solving the problem]

[0006] The present invention provides a head-up display device 1 having an outlet 17, which emits display light from the outlet 17 toward a light-transmitting member WS, thereby allowing a driver of a vehicle C to visually recognize at least a real image RI of a display image represented by the display light, the head-up display device 1 including a first display element, a first display unit 12a which transmits light emitted from a first light source 11a for a real image RI and displays the real image RI of the display image, a reflecting unit 13 which reflects at least a first light ray B1 representing the real image RI displayed on the first display unit 12a toward the light-transmitting member WS, and a reflecting unit 13 which is provided between the first light source 11a and the first display unit 12a along an optical path of the first light ray B1, and reflects the first light source 11a and an optical axis bending member 14 that receives the first light ray B1, bends a first optical axis S1 of the first light ray B1 at a predetermined angle, and emits the first light ray B1 as a second optical axis S2 to the first display unit 12a, the reflecting unit 13 includes a first mirror unit 13a that reflects and returns the first light ray B1, and a second mirror unit 13b that reflects the first light ray B1 from the first mirror unit 13a toward the exit 17, and the second mirror unit 13b is arranged so that a part of the second mirror unit 13b is included in a first virtual area A1 obtained by virtually translating the first display unit 12a along the second optical axis S2 to the opposite side to the first mirror unit 13a. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a compact head-up display device that does not interfere with vehicle parts, etc., arranged below the head-up display device, even if the size of the angle of view of the display unit is increased. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram showing the configuration of a head-up display device according to a first embodiment of the present invention. [Figure 2] FIG. 10 is a diagram showing an example of the configuration of a head-up display device without an optical axis bending member. [Figure 3] FIG. 1 is a first diagram showing a surplus space created by providing an optical axis bending member in a head-up display device according to a first embodiment of the present invention. [Figure 4] FIG. 2 is a second diagram showing the extra space created by providing the optical axis bending member in the head-up display device according to the first embodiment of the present invention. [Figure 5] FIG. 10 is a diagram showing the configuration of a head-up display device according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] (First embodiment of the present invention) A head-up display device (hereinafter referred to as HUD device) according to this embodiment will be described with reference to Figures 1 to 4. The HUD device 1 according to this embodiment allows a driver DR to view a real image RI on the inside of the vehicle through a windshield WS, and a virtual image VI on the outside of the vehicle.

[0010] 1 is a diagram showing the configuration of an HUD device 1 according to this embodiment. In FIG. 1, the HUD device 1 includes a first PGU (Picture Generation Unit) having at least a first light source 11a that emits light in the visible wavelength range, a first display unit 12a that transmits the light emitted by the first light source 11a and displays a real image (first display image) RI of a display image formed in front of a driver DR, and an optical axis bending member 14 that bends a first optical axis S1 of a first light ray B1 emitted by the first light source 11a at a predetermined angle to form a second optical axis S2. The first PGU 10b includes a first PGU (Planning Unit) 10a, a second light source 11b that emits light in the visible wavelength range, and a second display unit 12b that transmits the light emitted by the second light source 11b and displays a virtual image (second display image) VI of the display image formed in front of the driver DR, a reflector 13 that reflects a first light ray B1 representing the display image displayed on the first display unit 12a and a second light ray B2 representing the display image displayed on the second display unit 12b toward a windshield WS (a light-transmitting member), and a control unit 15 that controls the display content and display switching of the first display unit 12a and the second display unit 12b, and these are housed in a housing 16. The housing 16 is provided with an opening 17 (exit port) through which the first light ray B1 and the second light ray B2 are emitted, and a cover glass 18 is disposed in the opening 17 to protect the interior. The windshield WS is an example of a light-projecting member, and the opening 17 is an example of an exit port.

[0011] In Fig. 1, the first light ray B1 is indicated by a dotted line, and the second light ray B2 is indicated by a dashed line. In fact, countless light rays (display light) are emitted from the first display section 12a and the second display section 12b in Fig. 1, but here, the strongest light ray that is emitted from the center of the first display section 12a and passes through the center of the eyebox is indicated as the first light ray B1 as a representative light ray, and the strongest light ray that is emitted from the center of the second display section 12b and passes through the center of the eyebox is indicated as the second light ray B2 as a representative light ray.

[0012] The HUD device 1 is disposed below the windshield WS of the vehicle C (for example, inside an instrument panel (hereinafter referred to as "instrument panel")), and emits a first light ray B1 and a second light ray B2, which are projected onto the windshield WS. The first light ray B1 is generated by a first light source 11a and a first display unit 12a inside the HUD device 1, and the second light ray B2 is generated by a second light source 11b and a second display unit 12b. The first light ray B1 emitted from the first display unit 12a and the second light ray B2 emitted from the second display unit 12b travel along the reflector 13, pass through an opening 17 in a housing 16, and are emitted onto the windshield WS through a cover glass 18. By viewing the first light ray B1 reflected by the windshield WS, the driver DR of vehicle C can see a real image RI on the inside of the vehicle across the windshield WS, i.e., on the front side of the windshield WS as seen from the driver DR, and by viewing the second light ray B2 reflected by the windshield WS, the driver DR can see a virtual image VI on the outside of the vehicle across the windshield WS, i.e., on the back side of the windshield WS as seen from the driver DR.

[0013] As the real image RI shown in FIG. 1, for example, entertainment content, assistants or agents supporting the driver DR, or characters representing them are displayed on the front side of the windshield WS as seen from the driver DR. Furthermore, as the virtual image VI, for example, vehicle information such as the speed and engine RPM of the vehicle C, route guidance displays such as turn-by-turn directions and maps, warning displays such as a speed limit exceeding warning, and other information that is highly necessary to draw the driver DR's attention are displayed. These displays provide a driving environment that reduces the need for viewpoint movement and eye focal length adjustment. The real image RI and virtual image VI include characters and icons indicating this information as well as background portions, and in a planar view from the driver DR, they have, for example, a substantially rectangular shape.

[0014] In the first PGU 10a shown in FIG. 1, the first light source 11a is, for example, a light-emitting diode (LED) mounted on a wiring board that emits light in the visible wavelength range and emits white light. The first display unit 12a is located closer to the opening 17 along the optical path than the first light source 11a and has a first display element (not shown) of a TFT (Thin Film Transistor) type that forms display light representing an arbitrary image in accordance with a control signal sent from the control unit 15. An optical axis bending member 14 is disposed between the first light source 11a and the first display unit 12a. The optical axis bending member 14 receives a first light ray B1 from the first light source 11a, bends a first optical axis S1 of the strongest light in the first light ray B1 at a predetermined angle, and outputs the first light ray B1 to the first display unit 12a as a second optical axis S2. The optical axis bending member 14 may be any member capable of bending the first optical axis S1 of the first light ray B1 emitted from the first light source 11a, and may be, for example, a prism, a mirror, or a direct turning film (DFT). The action and effect of the optical axis bending member 14 will be described in detail later.

[0015] 1, the second light source 11b is, for example, a light-emitting diode that emits white light and emits light in the visible wavelength range mounted on a wiring board. The second display unit 12b is provided closer to the opening 17 along the optical path than the second light source 11b, and has a TFT-type second display element (not shown) that generates display light that displays an arbitrary image in accordance with a control signal sent from the control unit 15.

[0016] In addition to the above, in the first PGU 10a and the second PGU 10b, optical components such as a condenser lens, a lenticular lens, a diffusion plate, and a polarizing plate may be arranged at any position downstream of the first light source 11a and the second light source 11b, respectively.

[0017] In FIG. 1, the reflecting unit 13 includes a first mirror unit 13a and a second mirror unit 13b. The first mirror unit 13a includes a first correcting mirror 131 that reflects the first light ray B1 emitted from the first display unit 12a toward the second correcting mirror 132, and a second correcting mirror 132 that reflects the first light ray B1 emitted from the first correcting mirror 131 toward the second mirror unit 13b. The first correcting mirror 131 and the second correcting mirror 132 have mirrored surfaces and have complex free-form shapes to correct distortion of the image viewed by the driver DR. The second correcting mirror 132 is, for example, a half mirror that transmits the second light ray B2 representing the virtual image VI displayed on the second display unit 12b. The second light ray B2 that transmits through the second correcting mirror 132 is incident directly on the second mirror unit 13b (concave mirror 133).

[0018] The second mirror unit 13b has a mirror surface and at least a concave mirror 133 that reflects, toward the opening 17, the first light ray B1 reflected and folded back by the first mirror unit 13a and the second light ray B2 transmitted through the second correcting mirror 132. The concave mirror 133 is rotatably installed and rotates to match the eye position of the driver DR, freely changing the emission direction of the first light ray B1 and the second light ray B2 to adjust the position of the image. In particular, it may be desirable to change the angle of the display surface when the first light ray B1 displays a real image RI and when the second light ray B2 displays a virtual image VI (for example, displaying the virtual image VI as if it is tilted with respect to the road surface and the real image RI as if it is perpendicular to the road surface). By performing such adjustments by rotational drive, it is possible to display the display images at angles appropriate for the real image RI and the virtual image VI, respectively.

[0019] As shown in FIG. 1, first correcting mirror 131 is disposed at a position substantially the same height as the arrangement position of first PGU 10a, and reflects first light ray B1 emitted in a substantially horizontal direction from first display unit 12a in a substantially vertical direction toward second correcting mirror 132 disposed above first correcting mirror 131. Here, height in this disclosure refers to the up-and-down direction in FIG. 1, which is the distance in the up-and-down direction of vehicle C. Second correcting mirror 132 reflects first light ray B1 from the substantially vertical direction reflected by first correcting mirror 131 back in a substantially horizontal direction toward concave mirror 133 disposed at a position substantially the same height as the arrangement position of second correcting mirror 132. Concave mirror 133 is disposed above the arrangement position of first PGU 10a, and reflects first light ray B1 from the substantially horizontal direction reflected by second correcting mirror 132 toward opening 17 above. The first light ray B1 reflected by the concave mirror 133 is emitted to the windshield WS through the cover glass 18, and the driver DR visually recognizes the display image represented by the first light ray B1 as a real image RI.

[0020] At this time, the first correcting mirror 131 is positioned along the optical path of the first light ray B1 closer to the opening 17 than the first PGU10a, and is positioned closer to the first PGU10a than the first optical focus F1 of the imaging optical system including the window shield WS, the second correcting mirror 132, and the concave mirror 133.

[0021] It should be noted that the horizontal and vertical directions described above are shown based on the horizontal and vertical directions of vehicle C, but the reference for each direction is not limited to this, and this disclosure also includes cases where the entire device is tilted at a predetermined angle while the overall arrangement of each optical component maintains its relative positional relationship, depending on the internal shape of the instrument panel and the external shape of the housing 16.

[0022] By positioning the first PGU 10a and the reflector 13 in this manner, the optical path of the first light ray B1 is formed in a substantially U-shape, allowing the size of the housing 16 to be reduced. Furthermore, by positioning the first optical focus F1 closer to the opening 17 than the first correcting mirror 131, the real image RI can be displayed at any appropriate position in front of the driver DR. That is, if the first optical focus F1 is positioned closer to the first PGU 10a than the first correcting mirror 131, the first optical focus F1 will be farther away from the second correcting mirror 132. As the distance increases, the real image RI will be displayed closer to the driver DR and in a larger size, making it very difficult for the driver DR to see the real image RI. That is, it is preferable that the first optical focus F1 be closer to the second correcting mirror 132. In the HUD device 1 according to this embodiment, the reflector 13 is positioned so that the first optical focus F1 is located at least between the first correcting mirror 131 and the second correcting mirror 132, as shown in FIG. 1 .

[0023] In addition, the second display unit 12b of the second PGU10b is positioned along the optical path of the second light ray B2, closer to the opening 17 than the position of the second optical focus F2 of the imaging optical system including the windshield WS and the concave mirror 133.

[0024] With this configuration, when the first light source 11a is turned on, the first light ray B1 emitted from the first PGU 10a is reflected by the first correcting mirror 131, the second correcting mirror 132, the concave mirror 133, and the windshield WS, allowing the driver DR to view a real image RI on the inside of the vehicle through the windshield WS. Also, when the second light source 11b is turned on, the second light ray B2 emitted from the second PGU 10b passes through the second correcting mirror 132 and is reflected by the concave mirror 133 and the windshield WS, allowing the driver DR to view a virtual image VI on the outside of the vehicle through the windshield WS.

[0025] The control unit 15 controls the first PGU 10a and the second PGU 10b in cooperation with each other, turns on / off the first light source 11a and the second light source 11b, controls the display content of the first display unit 12a and the display content of the second display unit 12b, etc., to generate a first light ray B1 emitted from the first PGU 10a and a second light ray B2 emitted from the second PGU 10b.

[0026] Here, the operation and effect of the HUD device 1 when the optical axis bending member 14 is provided will be described in detail. FIG. 2 is a diagram showing an example of the configuration of the HUD device 1 when the optical axis bending member 14 is not provided. In FIG. 2, the first PGU 10a is disposed below the concave mirror 133. The optical axis S of the light ray B emitted from the first light source 11a is the most intense light ray in the first light source 11a, and in a chip-type LED, the light is oriented in a direction that coincides with the normal direction of the circuit board. Furthermore, the optical axis s of the light ray b emitted from the first display unit 12a is called a Gatley, and passes through the center of the first light ray B1 emitted from the first display unit 12a and is the main axis of the light that enters the driver's eye DR. The first PGU 10a shown in FIG. 2 does not include the optical axis bending member 14, so the optical axis S of the light ray B and the optical axis s of the light ray b are configured to substantially coincide (align linearly). In this case, if a vehicle part X (a predetermined part) in the instrument panel needs to be placed below the first PGU 10a, the vehicle part X and the first PGU 10a will interfere with each other, so the first PGU 10a needs to be moved upward, as shown in Fig. 2. If the first PGU 10a is moved upward, there is a possibility that the first PGU 10a will interfere with the concave mirror 133, making the layout of the optical components difficult.

[0027] 1, in the HUD device 1 according to the present embodiment, an optical axis bending member 14 is disposed between the first light source 11a and the first display unit 12a in the first PGU 10a. The optical axis bending member 14 bends a first optical axis S1 of the strongest light in the first light source 11a at a predetermined angle and outputs the first optical axis S2 to the first display unit 12a. That is, the first light source 11a and the first display unit 12a are disposed so that the first optical axis S1 and the second optical axis S2 intersect in a V-shape, and the optical axis bending member 14 that refracts light is disposed at the apex of the V-shape. As described above, the optical axis bending member 14 can be, for example, a prism (light guide) made of a transparent synthetic resin and formed in a triangle with a predetermined angle between its light receiving surface and light emitting surface. By positioning this optical axis bending member 14 at the apex of the character "へ", that is, at a higher position on the first PGU 10a compared to the case of Figure 2, it is possible to create excess space above the first light source 11a, which corresponds to the position of the starting end of the character "へ", and by positioning the concave mirror 133 so that part of the excess space is included, it is possible to efficiently utilize the space in the housing 16.

[0028] 3 is a first diagram showing a surplus space created by providing the optical axis bending member 14 in the HUD device 1 according to this embodiment. As shown in FIG. 3, when the optical axis bending member 14 receives a first light ray B1 from the first light source 11a, bends the first optical axis S1 of the first light ray B1 into a V-shape, and outputs the first light ray B1 to the first display unit 12a as a second optical axis S2, it becomes possible to arrange the concave mirror 133 so that a part of the concave mirror 133 is included in a movement area (referred to as a first virtual area A1) when the first display unit 12a is virtually translated along the second optical axis S2 toward the opposite side from the first correcting mirror 131. In other words, it becomes possible to arrange the first PGU 10a closer to the concave mirror 133 than in the case of FIG. 2.

[0029] At the same time, as shown in Fig. 3, it is possible to arrange the vehicle part X in a state where a part of it interferes with a movement area (referred to as a second virtual area A2) when the circuit board on which the first light source 11a is arranged is virtually translated along the second optical axis S2 toward the first display unit 12a. In other words, compared to the case of Fig. 2, it is possible to arrange the vehicle part X so that it is closer to the first PGU 10a above and the upper part fits into the extra space generated below the "V" shape.

[0030] 3, a part or all of the first light source 11a is disposed on the opposite side of the second optical axis S2 (including the extension line of the second optical axis S2) from the concave mirror 133. In other words, it is desirable that most of the concave mirror 133 is disposed above the second optical axis S2, and most of the first light source 11a is disposed below the second optical axis S2.

[0031] FIG. 4 is a second diagram showing the surplus space created by providing the optical axis bending member 14 in the HUD device 1 according to this embodiment. In FIG. 4, the angle between the first optical axis S1 and the second optical axis S2 is made smaller than in FIG. 3, and the apex position of the "V" shape is shifted to increase the difference between the optical path length of the first light ray B1 along the first optical axis S1 and the optical path length of the first light ray B1 along the second optical axis S2 in the first PGU 10a. In this case, the concave mirror 133 is positioned so that a portion of it interferes with a virtual extension of the second optical axis S2 toward the opposite side from the first correcting mirror 131. This structure further increases the surplus space created below the "V" shape compared to FIG. 3, making it possible to position the vehicle component X at a desired position without affecting the angle of view.

[0032] 1 to 4 is configured such that the first light ray B1 emitted from the first PGU 10a displays a real image RI, and the second light ray B2 emitted from the second PGU 10b displays a virtual image VI, but the HUD device 1 may be configured to include only the first PGU 10a without the second PGU 10b. In this case, the driver DR will only see the real image RI in front of the windshield WS.

[0033] As described above, the HUD device 1 according to this embodiment includes the first display unit 12a that transmits light emitted from the first light source 11a for the real image RI and displays the real image RI of the display image, the reflecting unit 13 that reflects at least the first light ray B1 representing the real image RI displayed on the first display unit 12a toward the windshield WS, and the optical axis bending member 14 that is provided between the first light source 11a and the first display unit 12a along the optical path of the first light ray B1, receives the first light ray B1 of the first light source 11a, bends the first optical axis S1 of the first light ray B1 at a predetermined angle, and emits the first light ray B1 to the first display unit 12a as the second optical axis S2. The reflecting unit 13 is a first mirror that reflects and bends the first light ray B1. The first PGU 10a includes a first light source 11a and a second mirror 13b that reflects a first light ray B1 from the first mirror 13a toward the opening 17, and the second mirror 13b is arranged so that a part of the second mirror 13b is included in a first virtual area A1 obtained by virtually translating the first display 12a along the second optical axis S2 toward the opposite side from the first mirror 13a. Therefore, the optical path of the first light ray B1 from the first light source 11a, via the optical axis bending member 14, to the first display 12a is bent in a V-shape, and by moving the first light source 11a located at the starting end of the V-shape downward, the entire first PGU 10a can be arranged closer to the concave mirror 133. Furthermore, because a surplus space is formed below the V-shape, this surplus space can be used as a space into which the upper part of the vehicle part X can be placed. As a result, even if the size of the first display unit 12a becomes relatively large, the size of the housing 16 of the entire HUD device 1 can be prevented from increasing, and interference with the vehicle parts X arranged below the HUD device 1 can be avoided.

[0034] Furthermore, if necessary, the first light source 11a is positioned on the opposite side of the concave mirror 133 with respect to the second optical axis S2, so that the first light source 11a and the concave mirror 133 are positioned so as to overlap one another vertically, thereby ensuring that the entire HUD device 1 is compact in the vertical direction.

[0035] Furthermore, if necessary, the concave mirror 133 is positioned so that at least a portion of it is on the second optical axis S2, so that a portion of the concave mirror 133 overlaps the second optical axis S2, thereby ensuring that the entire HUD device 1 is compact in the vertical direction.

[0036] Furthermore, if necessary, the vehicle part X of the vehicle C is arranged so that a part of it interferes with the second virtual area A2, which is obtained by virtually translating the circuit board on which the first light source 11a is arranged along the second optical axis S2 toward the first display unit 12a. This makes it possible to realize a configuration in which the upper part of the vehicle part X of the vehicle C is arranged to fit into the excess space formed below the "U" shape, thereby ensuring that the entire HUD device 1 is compact in the vertical direction.

[0037] Furthermore, if necessary, the second mirror portion 13b is a concave mirror with a curved surface, so that light incident from the optical path that traces the U-shape from below from the first display portion 12a via the first mirror portion 13a to the second mirror portion 13b can be reliably reflected toward the opening 17.

[0038] Furthermore, if necessary, the first mirror unit 13a is provided with a second correcting mirror 132, and a second display unit 12b is further provided, which is arranged on the opposite side of the reflective surface of the second correcting mirror 132 of the first mirror unit 13a, has a second display element, transmits light emitted by the second light source 11b for the virtual image VI, and displays the virtual image VI of the display image, and the second correcting mirror 132 of the first mirror unit 13a transmits the second light ray B2 representing the virtual image VI displayed on the second display unit 12b, and the concave mirror 133 of the second mirror unit 13b reflects the second light ray B2 toward the windshield WS, thereby allowing the virtual image VI of the display image to be viewed, thereby realizing a HUD device 1 that switches between displaying a real image RI and a virtual image VI.

[0039] (Second embodiment of the present invention) The HUD device 1 according to this embodiment will be described with reference to Fig. 5. Fig. 5 is a diagram showing the configuration of the HUD device 1 according to this embodiment. In the HUD device 1 according to the first embodiment, the first mirror section 13a is configured to include a first correcting mirror 131 and a second correcting mirror 132, but in the HUD device 1 according to this embodiment, as shown in Fig. 5, the first mirror section 13a is configured to include only one correcting mirror (second correcting mirror 132).

[0040] 5, a first light ray B1 emitted from the first PGU 10a is reflected by the second correcting mirror 132 toward the concave mirror 133, and then reflected by the concave mirror 133 toward the opening 17, so that a display image of a real image RI is visually recognized by the driver DR. A second light ray B2 emitted from the second PGU 10b passes through the second correcting mirror 132, which is a half mirror, and enters the concave mirror 133, and is reflected by the concave mirror 133 toward the opening 17, so that a display image of a virtual image VI is visually recognized by the driver DR. At this time, the first display unit 12a of the first PGU 10a is disposed closer to the first light source 11a than the position of the first optical focal point F1 of the imaging optical system including the windshield WS, the second correcting mirror 132, and the concave mirror 133. The second display unit 12b of the second PGU 10b is disposed closer to the opening 17 than the position of the second optical focal point F2 of the imaging optical system including the windshield WS and the concave mirror 133.

[0041] As in the first embodiment, the first PGU 10a is provided with an optical axis bending member 14 that bends the first optical axis S1 of the first light ray B1 emitted from the first light source 11a at a predetermined angle to form a second optical axis S2, and the entire first PGU 10a can be disposed close to the concave mirror 133. Furthermore, because a surplus space is formed below the first PGU 10a, this surplus space can be used as a space into which the upper part of the vehicle part X can be placed.

[0042] The HUD device 1 shown in FIG. 5 is configured such that the first light ray B1 emitted from the first PGU 10a displays a display image of a real image RI, and the second light ray B2 emitted from the second PGU 10b displays a display image of a virtual image VI, but the device may be configured to include only the first PGU 10a without including the second PGU 10b.

[0043] In this way, in the HUD device 1 according to this embodiment, by not including the first correcting mirror 131, a more compact HUD device 1 can be realized. [Explanation of symbols]

[0044] A1 First virtual area A2 Second virtual area B,b rays B1 1st ray B2 Second ray C vehicle DR Driver F1 1st optical focus F2 2nd optical focus RI real image (first displayed image) S,s optical axis S1 1st optical axis S2 2nd optical axis VI Virtual image (second display image) WS Window Shield X Vehicle parts 1 HUD device 10a 1st PGU 10b 2nd PGU 11a 1st light source 11b Second light source 12a 1st display section 12b 2nd display section 13 Reflector 13a First mirror section 13b Second mirror section 14 Optical axis bending member 15 Control Unit 16 Case 17 Opening 18 Coverslips 131 First correcting mirror 132 Second Correction Mirror 133 Concave Mirror

Claims

1. a head-up display device having an emission port, and emitting display light from the emission port toward a light-transmitting member to allow a driver of a vehicle to visually recognize a first display image represented by the display light, a first display unit including a first display element, transmitting light emitted from a first light source and displaying the first display image; a reflecting section that reflects at least a first light ray representing the first display image displayed on the first display section toward the light-transmitting member; an optical axis bending member that is provided between the first light source and the first display unit along an optical path of the first light ray, and that receives the first light ray from the first light source, bends a first optical axis of the first light ray at a predetermined angle, and outputs the first light ray to the first display unit as a second optical axis; and The reflecting portion is a first mirror portion that reflects and returns the first light ray; a second mirror portion that reflects the first light ray from the first mirror portion toward the exit; Including, The second mirror portion is The second mirror unit is disposed so that a part of the second mirror unit is included in a first virtual area obtained by virtually translating the first display unit along the second optical axis to the opposite side of the first mirror unit. A head-up display device.

2. The first light source is The second mirror portion is disposed on the opposite side of the second optical axis.

2. The head-up display device according to claim 1.

3. The second mirror portion is At least a part of the light source is disposed on the second optical axis.

2. The head-up display device according to claim 1.

4. The predetermined part of the vehicle is The circuit board on which the first light source is disposed is disposed so as to partially interfere with a second virtual area obtained by virtually translating the circuit board along the second optical axis toward the first display unit.

2. The head-up display device according to claim 1.

5. 2. The head-up display device according to claim 1, wherein the second mirror portion is a concave mirror having a curved surface.

6. the first mirror portion includes a correction mirror, a second display unit that is disposed on the opposite side of the first mirror unit from the reflecting surface of the correction mirror, includes a second display element, transmits light emitted from a second light source, and displays a second display image; 6. The head-up display device according to claim 5, wherein the correction mirror of the first mirror portion transmits a second light ray representing the second display image displayed on the second display portion, and the concave mirror of the second mirror portion reflects the second light ray toward the translucent member, thereby allowing the second display image to be viewed.

7. 6. The head-up display device according to claim 1, wherein the first display image is a real image.

8. 7. The head-up display device according to claim 6, wherein the first display image is a real image, and the second display image is a virtual image.

Images