Head-up display device

Abstract

To provide a head-up display (HUD) device which can inhibit a wall part from contacting with a reflection part.SOLUTION: A head-up display (HUD) device includes: a housing 40 formed with an opening H facing upward; and a reflection part 30 which is housed in the housing 40 and reflects display light indicating an image toward the opening H. The housing 40 has: a first case 41; and a second case 42 located above the first case 41 and formed with the opening H. The second case 42 has a wall part 420 which hangs from an end part of the opening H and faces a side surface 30a of the reflection part 30. The HUD device further includes an inhibition part 50 which applies a force acting in a direction away from the side surface 30a to the wall part 420 to inhibit the wall part 420 from contacting with the reflection part 30.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a head-up display device. [Background technology]

[0002] As a conventional head-up display (HUD) device, for example, Patent Document 1 describes a configuration in which display light reflected by a reflector constituted by a concave mirror or the like is emitted to the outside from an opening formed in an upper case. This upper case has a wall portion (see reference numeral 11 in FIG. 7 of the same document) that is formed to hang down and faces the side of the reflector. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2021 / 059953 Summary of the Invention [Problem to be solved by the invention]

[0004] The wall portion described in Patent Document 1 has a free lower end, and therefore may come into contact with the reflecting portion if it is deformed due to the effects of heat, etc. If the wall portion comes into contact with the reflecting portion, the position of the reflecting portion may be shifted or the driving of the reflecting portion may be hindered, which is undesirable.

[0005] The present disclosure has been made in consideration of the above-described circumstances, and has an object to provide a head-up display device that can prevent a wall portion from hitting a reflecting portion. [Means for solving the problem]

[0006] In order to achieve the above object, a head-up display device according to the present disclosure includes: A housing having an upward opening; a reflecting section that is accommodated in the housing and reflects display light representing an image toward the opening, the housing has a first case and a second case located above the first case and having the opening formed therein; the second case has a wall portion that hangs down from an end of the opening and faces a side surface of the reflecting portion, The display device further includes a suppression section that suppresses the wall section from contacting the reflecting section by applying a force to the wall section in a direction away from the side surface. Effect of the Invention

[0007] According to the present disclosure, it is possible to prevent the wall portion from hitting the reflecting portion. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic side view of a head-up display (HUD) device according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a perspective view of a main part of a reflecting portion and a housing according to the embodiment. [Diagram 3] FIG. 4 is a perspective view of a main part of a reflecting portion, a wall portion, and a suppressing portion according to the embodiment of the present invention. [Figure 4] FIG. 4 is a diagram showing the configuration of a suppression unit according to the embodiment; [Diagram 5] 13 is a diagram showing a configuration of a suppression unit according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] An embodiment of the present disclosure will be described with reference to the drawings.

[0010] A head-up display (HUD) device 1 shown in Fig. 1 is provided, for example, on the dashboard of a vehicle, and emits display light L toward the windshield of the vehicle. The display light L reflected by the windshield allows a user to visually recognize a virtual image of an image represented by the display light L. The virtual image indicates various information related to the vehicle, and is displayed in front of the vehicle through the windshield.

[0011] The HUD device 1 includes a display unit 10, a light path changing mirror 20, a reflecting unit 30, and a housing 40.

[0012] The display unit 10 displays an image and emits display light L that represents the image. The display unit 10 includes, for example, an LCD (Liquid Crystal Display) and a backlight that illuminates the LCD from behind. The LCD is, for example, a TFT (Thin Film Transistor) type. The backlight is, for example, composed of an LED (Light Emitting Diode), a light guide member, etc.

[0013] The light path changing mirror 20 changes the light path of the display light L emitted from the display unit 10. Specifically, the display light L reflected by the light path changing mirror 20 travels toward the reflecting unit 30. The light path changing mirror 20 is made of a plane mirror or a curved mirror, and is fixed to a second case 42 (described later) via a member not shown.

[0014] The reflecting unit 30 is configured to reflect the display light L from the optical path changing mirror 20 toward an opening formed in the housing 40. In detail, the reflecting unit 30 has a concave mirror 31 and a holder 32 shown in FIG.

[0015] The concave mirror 31 reflects the display light L from the optical path changing mirror 20 toward the opening. Due to the function of the concave mirror 31, the virtual image is visually recognized by the user at a size that is an enlarged version of the image displayed on the display unit 10.

[0016] The holder 32 holds the concave mirror 31 from behind. The holder 32 is supported by the housing 40 via a bearing member (not shown) so as to be rotatable around the axis line AX shown in Fig. 2. Therefore, the reflecting unit 30 is provided so as to be rotatable around the axis line AX.

[0017] The HUD device 1 includes a mirror driving unit (not shown) that rotates the reflecting unit 30. The mirror driving unit includes a motor, a driving circuit that drives the motor, a gear mechanism that transmits the rotation of the motor to the holder 32, and the like.

[0018] The housing 40 houses the various components described above, and has a first case 41 and a second case 42 located above the first case 41. Note that each drawing shows only a portion of the housing 40. It goes without saying that the housing 40 may further have components other than the first case 41 and the second case 42. For example, the housing 40 may further have a cover that covers the second case 42 from below.

[0019] The first case 41 is made of, for example, a metal, and is located behind the reflecting portion 30 as shown in FIG.

[0020] The second case 42 is formed of, for example, synthetic resin, and is joined to the first case 41 by known means such as screwing, engagement, or fitting. The second case 42 has an opening H facing upward (facing the windshield of the vehicle in this embodiment). A light-transmitting plate (not shown) that covers the opening H is attached to the second case 42. The display light L emitted from the display unit 10 and reflected by the optical path changing mirror 20 and the concave mirror 31 in this order passes through the light-transmitting plate and is emitted toward the windshield. The HUD device 1 includes a control unit (not shown) made of a computer. The control unit controls the operation of the display unit 10 and the mirror driving unit described above.

[0021] 2, the second case 42 has a wall portion 420 hanging down from the end of the opening H. The wall portion 420 faces the side surface 30a of the reflecting unit 30. Here, the side surface 30a of the reflecting unit 30 may be the side surface of the concave mirror 31 or the holder 32, but in this embodiment, a reference symbol indicating the side surface 30a of the reflecting unit 30 is attached to the side surface of the holder 32 that is closer to the wall portion 420. The wall portion 420 is provided so that no unnecessary members are exposed in the space through which the display light L passes inside the housing 40. This is because if unnecessary members are exposed in the space, their images will be visually recognized by the user.

[0022] The wall portion 420 is provided at a distance from the side surface 30a so as not to hinder the rotational movement of the reflecting portion 30. However, if the wall portion 420 is deformed due to a factor such as heat and bent toward the reflecting portion 30, there is a risk that the wall portion 420 may come into contact with the reflecting portion 30. In order to prevent this, the HUD device 1 further includes a suppressing portion 50 that suppresses the wall portion 420 from coming into contact with the reflecting portion 30 by pressing the wall portion 420 in a direction away from the side surface 30a (hereinafter, the separating direction D). The suppressing portion 50 may press at least when the wall portion 420 is bent toward the side surface 30a. That is, in a normal state, the suppressing portion 50 may only be in contact with the wall portion 420, or may not be in contact with the wall portion 420. In the present disclosure, as an example, a mode in which the wall portion 420 is always pressed by the suppressing portion 50 is shown.

[0023] In this embodiment, the suppression part 50 is formed integrally with the first case 41. As shown in Fig. 3, the first case 41 has a base part 410 located below the wall part 420. The upper surface of the base part 410 is located with a gap between it and the lower end of the wall part 420. The suppression part 50 is formed to protrude upward from the base part 410.

[0024] 3 or 4, the suppression section 50 has an upwardly convex shape, specifically, a trapezoidal shape tapering upward. The suppression section 50 has an inclined surface 51 whose lower end is farther away from the side surface 30a of the reflecting section 30 than its upper end, an upper surface 52, and an opposing surface 53 located behind the inclined surface 51 and opposing the side surface 30a.

[0025] A corresponding portion 60 corresponding to the suppression portion 50 is formed at the lower end of the wall portion 420. The corresponding portion 60 is a concave portion into which the suppression portion 50 is inserted, and has a pressed surface 61 having a similar inclination to the inclined surface 51 and pressed by the inclined surface 51, and a covering surface 62 covering the upper surface 52, as shown in FIG.

[0026] By inserting the suppression section 50 provided on the first case 41 into the corresponding section 60 of the wall section 420, the pressed surface 61 of the corresponding section 60 is pressed by the inclined surface 51 of the suppression section 50. As a result, a force is applied to the wall section 420 in the separation direction D, and the wall section 420 can be prevented from touching the reflecting section 30 (the holder 32 in this example). In particular, in this embodiment, the suppression section 50 formed integrally with the first case 41 is made of a metal having higher rigidity than the second case 42 made of resin. As a result, the wall section 420 can be more effectively prevented from being thermally deformed toward the reflecting section 30.

[0027] Furthermore, the upper surface 52 of the suppression unit 50 is covered by the covering surface 62 of the corresponding unit 60 provided on the wall portion 420. That is, the upper surface 52 of the suppression unit 50 is covered by the wall portion 420. This prevents the upper surface 52 of the suppression unit 50 from being exposed to the space inside the housing 40 through which the display light L passes, and prevents the upper surface 52 of the suppression unit 50 from being viewed by the user as an unnecessary image.

[0028] 4, the main surface 421 of the wall portion 420 facing the side surface 30a of the reflecting portion 30 and the opposing surface 53 of the suppressing portion 50 are flush with each other. This prevents a step from occurring between the wall portion 420 and the suppressing portion 50, and therefore prevents the step from being visually recognized by the user as an unnecessary image.

[0029] 1 is provided on the back surface of the main surface 421 of the wall portion 420. The rib 422 connects the bezel portion 42a surrounding the opening H in the second case 42 to the wall portion 420, and reinforces the wall portion 420. The rib 422 also suppresses the wall portion 420 from deforming in a direction approaching the reflecting portion 30. This completes the description of this embodiment.

[0030] The present disclosure is not limited to the above-described embodiments and drawings. Appropriate changes (including deletion of components) can be made to the embodiments without departing from the spirit of the present disclosure.

[0031] In the above embodiment, an example was shown in which the corresponding portion 60 was formed by hollowing out a part of the wall portion 420 in a concave shape. However, as in the modified example shown in FIG. 5, the corresponding portion 60 may be formed by providing a protruding portion 413 protruding toward the base portion 410 at the lower end of the wall portion 420. The function of the corresponding portion 60 shown in FIG. 5 is the same as in the above embodiment. In other words, the configuration is not limited to inserting the convex suppressing portion 50 into the concave portion provided in the wall portion 420, and a configuration in which the convex suppressing portion 50 presses the convex portion provided in the wall portion 420 in the separation direction D may be adopted.

[0032] In the above embodiment, the configuration of one side surface of the reflecting portion 30 has been described, but the configuration of the other side surface (not shown) may be the same. In other words, there may be a pair of combinations of the suppressing portion 50 and the wall portion 420 pressed by the suppressing portion 50.

[0033] The suppressing unit 50 does not have to be formed integrally with the first case 41, and may be composed of a member that is fixed directly or indirectly to the first case 41 and is immovable with respect to the first case 41. In the above, an example in which the suppressing unit 50 presses the wall portion 420 in the separation direction D has been shown, but the configuration of the suppressing unit 50 can be changed arbitrarily as long as it can apply a force in the separation direction D to the wall portion 420. For example, a force in the separation direction D may be applied to the wall portion 420 by providing an adhesive or a pressure-sensitive adhesive between the member located on the back side of the wall portion 420 (the back side of the main surface 421) and the wall portion 420. In this case, the adhesive or the pressure-sensitive adhesive functions as the suppressing unit 50. The member located on the back side of the wall portion 420 may be, for example, a bearing member not shown. In addition, the suppressing unit 50 may be composed of an elastic member, wire, or the like that pulls the wall portion 420 in the separation direction D. In this case, the tensile force may be adjusted so that the wall portion 420 does not deform in the separation direction D.

[0034] In the above, an example has been shown in which the first case 41 and the suppression unit 50 are made of metal and the second case 42 is made of resin, but the first case 41 and the suppression unit 50 may also be made of resin. Here, the second case 42 having the wall portion 420 is located higher than the first case 41 and is therefore prone to thermal deformation due to the influence of sunlight. Therefore, even if the first case 41 has the same level of rigidity as the second case 42, the suppression unit 50 that is integral with the first case 41 or immovable relative to the first case 41 can prevent the wall portion 420 from coming into contact with the reflector 30.

[0035] In the optical path of the display light L connecting the display unit 10 and the concave mirror 31, the number of mirrors to be used, how the optical path of the display light L is folded back, and the like can be appropriately changed according to the design.

[0036] In the above, an example has been described in which the reflecting unit 30 is provided to be rotatable relative to the housing 40, but the reflecting unit 30 may be provided to be capable of translational movement. For example, the reflecting unit 30 may be capable of translational movement along the wall portion 420.

[0037] The display unit 10 is not limited to one using an LCD, and may be one using an OLED (Organic Light-Emitting Diode). The display unit 10 may also be one using a reflective display device such as a DMD (Digital Micro Mirror Device) or LCOS (Liquid Crystal On Silicon).

[0038] The target onto which the display light L is projected is not limited to the windshield of the vehicle, but may be a combiner constituted by a plate-shaped half mirror, a hologram element, or the like.

[0039] The type of vehicle on which the HUD device 1 is mounted is not limited, and the HUD device 1 can be mounted on various vehicles such as four-wheeled motor vehicles, motorcycles, etc. The HUD device 1 may also be mounted on vehicles other than cars, such as aircraft, ships, snowmobiles, etc.

[0040] In the above description, descriptions of well-known technical matters have been omitted as appropriate in order to facilitate understanding of the present disclosure. [Explanation of symbols]

[0041] 1...Head-up display (HUD) device, L...Display light 10...display unit, 20...light path changing mirror 30: Reflecting portion; 30a: Side surface; 31: Concave mirror; 32: Holder; AX: Axis line 40…Housing 41…first case, 410…base 42...Second case, H...Opening 420: wall portion, 421: main surface, 422: rib 50: suppression portion, 51: inclined surface, 52: upper surface, 53: opposing surface 60: corresponding portion, 61: pressed surface, 62: covering surface D…Separation direction

Claims

1. A housing having an upward opening; a reflecting section that is accommodated in the housing and reflects display light representing an image toward the opening, the housing includes a first case and a second case located above the first case and having the opening formed therein; the second case has a wall portion that hangs down from an end of the opening and faces a side surface of the reflecting portion, The wall portion is further provided with a suppression portion that suppresses the wall portion from contacting the reflection portion by applying a force in a direction away from the side surface to the wall portion. Head-up display device.

2. the suppression portion is integral with the first case or is immovable relative to the first case, is formed to protrude upward, and has an inclined surface that presses the wall portion in a direction away from the side surface, The wall portion has a pressed surface that is pressed by the inclined surface. The head-up display device according to claim 1 .

3. The upper surface of the suppression portion is covered by the wall portion. The head-up display device according to claim 1 or 2.

4. A main surface of the wall portion facing the side surface and a surface of the suppression portion facing the side surface are flush with each other. The head-up display device according to any one of claims 1 to 3.

Images