Head-up display device

Abstract

To provide a head-up display device capable of shielding external light and easily installing a component such as a mirror in a housing.SOLUTION: The HUD device 1 includes a display 30, a first mirror 21, a second mirror 22, a housing 50, a cover 61, an inner case 51, and a bezel 52 with a light shielding wall. Bezel 52 with the light shielding wall is attached to an upper end of first mirror 21. The bezel 52 with the light shielding wall shields external light incident on the housing 50 from the opening 60, and prevents unexpected reflection on the windshield. Further, by attaching the bezel 52 with the light shielding wall to the first mirror 21, the reflection range on the first mirror 21 is suppressed to the minimum necessary, the display light 14 leaking out of the optical path 11 of the virtual image display is not reflected by the first mirror 21, and the occurrence of stray light can be prevented.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] 2. Description of the Related Art A head-up display device is known that is attached to a vehicle and projects light from a display onto the windshield to display vehicle driving information and the like to the driver as a virtual image in front of the windshield (on the outside of the vehicle).

[0003] 3 is a schematic diagram of a conventional head-up display device 510 (see Patent Document 1). The head-up display device 510 includes a light source 511, a display 513, a first concave mirror 514 that reflects display light 512 emitted from the display 513, a second concave mirror 516 that reflects display light 515 reflected by the first concave mirror 514, and a case 520.

[0004] The first concave mirror 514 has a curvature (the reciprocal of the radius) that causes the reflected display light 515 to cross above and below before reaching the second concave mirror 516 .

[0005] The case 520 is provided with a first shielding portion 523 and a second shielding portion 524 which extend to the vicinity of a crossing point 522 where an optical path 521 between the first and second concave mirrors 514 and 516 is interposed between them. An anti-reflection treatment film 527 which weakens or blocks reflection of external light 525 is formed on the first and second shielding portions 523 and 524.

[0006] In such a head-up display device 510, external light 525 that enters the case 520 from outside, is reflected by the second concave mirror 516, and travels toward the first concave mirror 514 can be blocked by the first and second shielding portions 523 and 524. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 6579319 Summary of the Invention [Problem to be solved by the invention]

[0008] In the conventional head-up display device 510, the case 520 is provided with first and second shielding parts 523, 524, which results in a complicated labyrinth structure inside the case 520, making it difficult to install components such as mirrors inside the case 520.

[0009] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a head-up display device that can block external light and that allows components such as a mirror to be easily installed inside the housing. [Means for solving the problem]

[0010] The present invention is a head-up display device comprising a display, a first mirror that reflects display light emitted from the display, a second mirror that reflects the display light reflected by the first mirror, and a housing that contains the display, the first mirror, and the second mirror, wherein the first mirror causes the display light to cross above and below before reaching the second mirror, and a member having a light-shielding wall is attached to at least one of the first mirror or the second mirror. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a head-up display device that can block external light and in which components such as a mirror can be easily installed inside the housing. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic diagram of a head-up display device according to an embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged view of the area enclosed by the dashed line in FIG. [Figure 3]FIG. 1 is a schematic diagram of a conventional head-up display device. DETAILED DESCRIPTION OF THE INVENTION

[0013] A "head-up display device" according to one embodiment of the present invention will be described with reference to Figs. 1 and 2. Fig. 1 is a schematic diagram of a head-up display device (hereinafter referred to as "HUD device") 1 according to one embodiment of the present invention. Fig. 2 is an enlarged view of the portion surrounded by the dashed line in Fig. 1.

[0014] The HUD device 1 is housed inside the instrument panel of a vehicle and projects display light onto the windshield to display vehicle driving information and the like to the driver as a virtual image in front of the windshield (on the outside of the vehicle).

[0015] 1, the HUD device 1 includes a display 30, a first mirror 21, a second mirror 22, a housing 50, a cover 61, an inner case 51, and a bezel with a light-shielding wall 52. In FIG. 1, 11 denotes an optical path, and 12 denotes an optical path axis.

[0016] The display 30 emits display light, and may be, for example, a liquid crystal display. The display 30 emits the display light toward the first mirror 21.

[0017] The first mirror 21 reflects the display light emitted from the display device 30 toward the second mirror 22. The first mirror 21 has a curvature that causes the display light to cross above and below before reaching the second mirror 22. Reference numeral 13 in Fig. 1 denotes the crossing point.

[0018] The second mirror 22 reflects the display light reflected by the first mirror 21 toward the windshield side.

[0019] The housing 50 contains the display 30, the first mirror 21, the second mirror 22, an inner case 51, and a bezel 52 with a light-shielding wall. The housing 50 is made of a light-shielding synthetic resin, such as black. The housing 50 has an opening 60 formed therein to allow the display light reflected by the second mirror 22 to pass outside.

[0020] The cover 61 covers the opening 60. The cover 61 is made of a translucent synthetic resin. The display light reflected by the second mirror 22 passes through the cover 61 and is projected onto the windshield. The display light reflected by the windshield is directed toward the eyes of the driver in the driver's seat. The driver recognizes the display light that has entered his eyes as a virtual image displayed in front of the windshield (outside the vehicle).

[0021] The inner case 51 is made of a light-blocking material, such as black. The inner case 51 has a cylindrical portion 51a that is disposed between the display 30 and the first mirror 21, and a plate portion 51b that is disposed directly below the opening 60 and in a position that does not block the display light reflected from the first mirror 21 to the second mirror 22. The inner case 51 blocks external light that enters the housing 50 through the opening 60, preventing unexpected reflections on the windshield.

[0022] The bezel with light-shielding wall 52 is made of a light-shielding material, such as black. The bezel with light-shielding wall 52 is attached to the upper end of the first mirror 21. As shown in FIG. 2, the bezel with light-shielding wall 52 has an attachment portion 52a attached to the first mirror 21 and a light-shielding wall 52b protruding from the reflective surface of the first mirror 21 toward the second mirror 22.

[0023] The bezel with light-shielding wall 52 blocks external light that enters the housing 50 through the opening 60, preventing unexpected reflections on the windshield. Also, by attaching the bezel with light-shielding wall 52 to the first mirror 21, the reflection range on the first mirror 21 is kept to a necessary minimum, and the display light 14 that leaks out of the optical path 11 of the virtual image display is no longer reflected by the first mirror 21 (the display light 14 is absorbed by the bezel with light-shielding wall 52). This makes it possible to prevent stray light from occurring.

[0024] Note that the dashed two-dot line 14a in Figures 1 and 2 represents stray light that occurs when the display light 14 leaks out of the optical path 11 of the virtual image display and is reflected by the first mirror 21 when the bezel with a light-shielding wall 52 is not attached to the first mirror 21.

[0025] Compared to a conventional head-up display device 510, such a HUD device 1 can block external light without a light-shielding wall in the housing 50. In the conventional head-up display device 510, the case 520 is provided with first and second shielding sections 523, 524, which creates a complicated labyrinth structure inside the case 520, making it difficult to install components such as a mirror inside the case 520. In contrast, the HUD device 1 blocks external light with the bezel 52 with a light-shielding wall attached to the first mirror 21 and the inner case 51, so the above problem does not occur and assembly is easy. In addition, since there is more space near the cross point 13, the HUD device 1 can be expected to be more compact.

[0026] In the above-described embodiment, the bezel 52 with a light-shielding wall is attached to the first mirror 21, but in the present invention, it is sufficient that a member having a light-shielding wall is attached to at least one of the first mirror or the second mirror.

[0027] Furthermore, in the above-described embodiment, the bezel 52 with a light-shielding wall is described as a "component having a light-shielding wall," but the "component having a light-shielding wall" is not limited to a bezel, and masking tape, an elastic member, a clip device, etc. may also be used. For example, depending on the component used, such as a clip device, the number of steps required for assembly can be reduced, which is expected to improve ease of assembly.

[0028] The above-described embodiment merely shows a typical form of the present invention, and the present invention is not limited to this embodiment. In other words, the present invention can be implemented with various modifications within the scope of the gist of the present invention. As long as such modifications still include the configuration of the present invention, they are of course included in the scope of the present invention. [Explanation of symbols]

[0029] 1 Head-up display device 21 1st mirror 22 Second mirror 30 Display 50 Housing 51 Inner case 52 Bezel with light-shielding wall 52b Blackout wall

Claims

1. a display device, a first mirror that reflects display light emitted from the display device, a second mirror that reflects the display light reflected by the first mirror, and a housing that accommodates the display device, the first mirror, and the second mirror; the first mirror crosses the display light above and below before it reaches the second mirror; A member having a light-shielding wall is attached to at least one of the first mirror and the second mirror. A head-up display device.

2. The member having the light-shielding wall is attached to the upper end of the first mirror.

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

3. an inner case accommodated in the housing; The inner case is made of a light-blocking material and is disposed at a position where it does not block the display light reflected from the first mirror to the second mirror.

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

Images