WO2018198821A1

WO2018198821A1 - Headup display device

Info

Publication number: WO2018198821A1
Application number: PCT/JP2018/015503
Authority: WO
Inventors: 真哉佐藤; 勝己中静
Original assignee: 日本精機株式会社
Priority date: 2017-04-27
Filing date: 2018-04-13
Publication date: 2018-11-01
Also published as: JP7115471B2; JPWO2018198821A1

Abstract

The purpose of the present invention is to provide a low cost headup display device. A headup display device (10) of the present invention is provided with: a display (13) that outputs display light; a first mirror (14) that reflects the display light outputted from the display (13); a second mirror (16) that reflects the display light reflected by the first mirror (14); and a case (20) that houses the display (13) and the first and second mirrors (14, 16). The mirror surface of the first mirror (14) has a substantially rectangular shape in front view, and is formed in a curved surface shape along the longitudinal axis.

Description

Head-up display device

The present invention relates to a head-up display device having two mirrors whose mirror surfaces are both curved surfaces.

Some vehicles are equipped with a head-up display device that projects a virtual image in front of the driver and provides information to the driver. As a head-up display device, one that reflects display light by a plurality of mirrors and guides it to a windshield is known. As a conventional technique related to such a head-up display device, there is a technique disclosed in Patent Document 1.

As shown in Patent Literature 1, a head-up display device includes a display that emits display light, a first mirror that reflects display light emitted from the display, and a display that is reflected by the first mirror. A second mirror that reflects light, these indicators, and a case that houses the first and second mirrors are provided.

The mirror surface of the first mirror is formed in a concave shape so that the reflected display light crosses up and down before reaching the second mirror. The case includes a first shielding portion and a second shielding portion that extend to the vicinity of a cross point where display light crosses.

The outside light such as sunlight is prevented from reaching the inside of the case by the first shielding part and the second shielding part. Most of the outside light is shielded by the first and second shielding parts, and cannot reach the first mirror or the display part. Sunlight countermeasures can be taken without using a shutter or a reflective polarizing film.

JP 2016-103008 A

By the way, the aspect ratio, which is the aspect ratio of the virtual image that is projected, differs depending on the vehicle type and vehicle on which the head-up display device is mounted. Since the display mounted on the head-up display device is expensive, the head-up display device becomes expensive when designed for each vehicle type or vehicle.

An object of the present invention is to provide an inexpensive head-up display device.

According to the first aspect of the present invention, the display that emits the display light, the first mirror that reflects the display light emitted from the display, and the second that reflects the display light reflected by the first mirror. A mirror, the display, and a case for housing the first and second mirrors,
The mirror surface of the first mirror has a substantially rectangular shape in front view and is formed in a concave surface along the short axis,
The curvature of the concave surface is a curvature that causes the reflected display light to cross up and down before reaching the second mirror,
The mirror surface of the second mirror is formed as a concave surface that reflects the received display light,
The case includes a first shielding portion and a second shielding portion that extend to the vicinity of the crossing point that crosses the optical path between the first and second mirrors,
In the head-up display device in which outside light entering the case from outside the case, reflected by the second concave mirror, and directed to the first concave mirror is shielded by the first and second shielding portions,
The head-up display device is provided in which the mirror surface of the first mirror is formed in a curved shape along the longitudinal axis.

In the invention according to claim 1, the mirror surface of the first mirror is formed in a curved shape along the longitudinal axis. The length of the projected virtual image in the longitudinal direction can be adjusted by the curvature of the curved surface. On the other hand, the curvature of the short axis must be such that the display light crosses before reaching the second mirror. For this reason, the curvature of the first mirror in the short direction is defined by the size of the case and the like. For this reason, it is difficult to change the setting for each vehicle type or vehicle on which the head-up display device is mounted. The aspect ratio can be set to an arbitrary value by adjusting the length in the longitudinal direction. There is no need to prepare an expensive indicator for each vehicle type or vehicle. An inexpensive head-up display device can be provided.

1 is a basic configuration diagram of a head-up display device according to an embodiment of the present invention. It is sectional drawing of the head-up display apparatus based on the Example of this invention. FIG. 3 is an exploded view of the head-up display device shown in FIG. 2. It is a figure explaining the 1st mirror shown by FIG. It is a top view of the 1st mirror by the example of a change. It is a figure explaining the shielding effect | action of the 1st, 2nd shielding part shown by FIG. It is a figure explaining the effect | action of the 1st mirror shown by FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the description, left and right refer to the left and right with reference to the operator of the head-up display device, and front and rear refer to the front and rear with reference to the traveling direction of the vehicle on which the head-up display device is mounted. In the figure, Fr indicates the front, Rr indicates the rear, Le indicates the left when viewed from the occupant, Ri indicates the right when viewed from the occupant, Up indicates the upper side, and Dn indicates the lower side.
<Example>

Refer to FIG. The head-up display device 10 is arranged on a light source 11 and emits display light 12, a first mirror 14 that reflects display light 12 emitted from the display 13, and the first mirror 14. A second mirror 16 that reflects the display light 15 reflected by the windshield (windshield) 66 of the vehicle, and a case 20 that houses the light source 11, the display 13, and the first and

second mirrors

14 and 16. It is equipped with.

The first mirror 14 has a concave surface (a reciprocal of the radius) that causes the reflected display light 15 to cross up and down before reaching the second mirror 16. The second mirror 16 has a concave surface that magnifies and reflects the received display light, and this concave surface also serves to correct the distortion of the virtual image due to the curvature of the windshield of the vehicle. That is, the first mirror 14 has a curvature such that the focal point of the first mirror 14 is located between the first mirror 14 and the second mirror 16. In other words, the distance from the first mirror 14 to the second mirror 16 is set to be longer than the focal length of the first mirror 14.

The case 20 includes a first shielding part 23 and a second shielding part 24 that extend to the vicinity of the crossing point 22 that crosses the optical path 21 between the first and

second mirrors

14 and 16. External light 25 that enters the case 20 from outside the case 20, is reflected by the second mirror 16, and travels toward the first mirror 14 can be shielded by the first and

second shielding portions

23 and 24.

The lower end (front end portion) of the first shielding portion 23 connects at least the upper end portion P1 of the reflection region of the display light 12 in the first mirror 14 and the upper end portion P2 of the reflection region of the display light 15 in the second mirror 16. It is located on the cross point 22 side (lower side) with respect to the elliptical line segment L1.

The upper end (tip portion) of the second shielding part 24 connects at least the lower end part P3 of the reflection area of the display light 12 in the first mirror 14 and the lower end part P4 of the reflection area of the display light 15 in the second mirror 16. It is located closer to the cross point 22 (upper side) than the ellipse segment L2.

Note that the first and

second shielding parts

23 and 24 extend so that their tips approach each other. The closer the tips are, the higher the shielding property of the external light 25, which is desirable. That is, it is desirable that the tips of each other are close to the cross point 22 (focal point).

Refer to FIG. 2 and FIG. The case 20 includes a center frame 30 that supports the first and

second mirrors

14 and 16 and includes a second shielding portion 24, an upper cover 50 that is mounted on the center frame 30 and includes the first shielding portion 23, and a center. A lower cover 55 attached under the frame 30.

The center frame 30 is an aluminum die-cast product having mounting

flanges

31 and 31 on the outer periphery and a second shielding part 24 extending obliquely upward inside.

For example, a stay 32 is welded to the center frame 30, and the first mirror 14 is fixed to the stay 32 with an adhesive layer 33. The second mirror 16 is fixed to the stays 34 to 36 welded to the inner surface of the center frame 30 with adhesive layers 37 to 39.

Extend the stay 41 from the bottom of the center frame 30. On the other hand, the light source 11 and the display device 13 are fitted to the cylindrical bracket 42, and the bracket piece 43 extending from the cylindrical bracket 42 is fixed to the stay 41 with

screws

44 and 44.

If the center frame 30 is an aluminum die-cast product, the strength is much higher than that of a resin molded product, and the rigidity is high. Since the first and

second mirrors

14 and 16 and the display 13 are collectively attached to the rigid center frame 30, it is difficult to adjust these optical axes. Furthermore, the rigid center frame 30 is attached to the vehicle by

attachment flanges

31 and 31. If the cover is entirely made of resin, the rigidity may be insufficient and the optical axis may need to be readjusted. On the other hand, since the head-up display device 10 of the embodiment is rich in rigidity, the concern is small.

The upper cover 50 is, for example, a polycarbonate molded product, and includes a cover glass 51 on the upper surface and integrally includes a first shielding portion 23 that extends obliquely downward.

The lower cover 55 is a bottomed cylindrical body that opens upward, and is, for example, an ABS resin molded product and includes a printed circuit board 56.

The lower cover 55 is attached to the center frame 30 with

screws

57 and 57 from below, and the upper cover 50 is attached with screws 52 from above.

Refer to FIG. FIG. 4A shows the first mirror 14 as viewed from the front. The mirror surface of the first mirror 14 has a substantially rectangular shape in front view of the first mirror 14.

Refer to FIG. 4 (b). FIG.4 (b) is a 4b arrow line view of Fig.4 (a). The mirror surface of the first mirror 14 is formed in a convex shape with a central portion in the longitudinal direction protruding toward the second mirror 16 (see FIG. 2). That is, the mirror surface of the first mirror 14 is formed in a curved shape along the longitudinal axis.

Refer to FIG. FIG. 5 shows a first mirror 74 according to a modification. The mirror surface of the first mirror 74 is formed in a concave shape so that the central portion in the longitudinal direction is away from the second mirror 16 (see FIG. 2). That is, the mirror surface of the first mirror 74 is formed in a curved shape along the longitudinal axis.

Refer to FIG. The display light 12 emitted from the display device 13 is reflected by the first mirror 14, and the display light 15 reflected by the first mirror 14 passes between the first and

second shielding portions

23 and 24, It reaches the second mirror 16. The display light 17 reflected by the second mirror 16 rises and reaches the windshield 66 of the vehicle (projection unit 66 on which the reflected display light 17 is projected).

As shown in FIG. 6A, when the altitude of the sun 58 is low, the external light 25 represented by sunlight passes through the cover glass 51 and is reflected by the second mirror 16, and is reflected by the first shielding unit 23. Shielded. Since the 1st shielding part 23 is a polycarbonate excellent in heat resistance, the intensity | strength with respect to a heat | fever is high.

When the altitude of the sun 58 is high, the external light 25 passes through the cover glass 51, is reflected by the second mirror 16, and is shielded by the second shielding part 24, as shown in FIG. Since the 2nd shielding part 24 is aluminum which is further excellent in heat resistance, the intensity | strength with respect to heat is still higher.

Refer to FIG. 2 and FIG. The curvature of the short axis (vertical side) of the first mirror 14 needs to be such that the display light crosses before reaching the second mirror 16. For this reason, the curvature of the short direction of the 1st mirror 14 is prescribed | regulated from the magnitude | size etc. of a case. For this reason, when trying to share parts, it is difficult to change the setting for each vehicle type or vehicle on which the head-up display device 10 is mounted. On the other hand, the setting of the curvature in the longitudinal direction (lateral side) can be changed for each vehicle type or vehicle on which the head-up display device 10 is mounted.

Refer to FIG. FIG. 7A shows the first mirror 14 having a convex central portion in the longitudinal direction. When the display light reflected by the first mirror 14 is projected, the length of the projected image is horizontal b1 and vertical a1. Compared with the case where the horizontal length of the projected image when the central portion in the longitudinal direction of the first mirror 14 is a plane is b0, the second mirror 16 has a horizontal width of the image displayed by the display unit 13. Can be reduced. That is, the aspect ratio of the projected image can be adjusted by adjusting the curvature (curvature radius) of the convex surface. In this case, the aspect ratio is b1: a1.

Refer to FIG. 7 (b). FIG. 7B shows a first mirror 74 having a concave central portion in the longitudinal direction. When the display light reflected by the first mirror 74 is projected, the length of the projected image is horizontal b2 and vertical a1. Compared to the case where the horizontal length of the projected image when the central portion in the longitudinal direction of the first mirror 74 is a plane is b0, the second mirror 16 has a horizontal width of the image displayed by the display unit 13. Can be expanded. That is, the aspect ratio of the projected image can be adjusted by adjusting the curvature (curvature radius) of the concave surface. In this case, the aspect ratio is b2: a1.

Refer also to FIG. The images projected by the

first mirrors

14 and 74 having the same curvature in the short-side direction have the same length in the vertical direction (short-side direction) of a1. That is, in the present invention, the length of the image in the short direction is set to a1, and the length in the longitudinal direction is adjusted by adjusting the curvature in the lateral direction (longitudinal direction) of the

first mirrors

14 and 74. Set to value. Thereby, the projected image can be set to a desired aspect ratio.

The present invention described above has the following effects.

Refer to FIG. 2 and FIG. The mirror surface of the first mirror 14 is formed in a curved shape along the longitudinal axis. The length of the projected virtual image in the longitudinal direction can be adjusted by the curvature of the curved surface. On the other hand, the curvature of the short axis must be such that the display light crosses before reaching the second mirror 16. For this reason, the curvature of the first mirror 14 in the short direction is defined by the size of the case 20 and the like. For this reason, it is difficult to change the setting for each vehicle type or vehicle on which the head-up display device 10 is mounted. The aspect ratio can be set to an arbitrary value by adjusting the length in the longitudinal direction. There is no need to prepare an expensive indicator 13 for each vehicle type or vehicle. An inexpensive head-up display device 10 can be provided.

The shape of the second mirror 16 is determined by the distance to the windshield on which the image is projected. Also in this respect, the aspect ratio is preferably adjusted by the first mirror 14.

The head-up display device of the present invention is suitable for passenger cars, but may be applied to other vehicles and construction equipment such as ordinary vehicles, ships, and aircraft. That is, the present invention is not limited to the examples as long as the operations and effects of the present invention are exhibited.

The head-up display device of the present invention is suitable for passenger cars.

DESCRIPTION OF SYMBOLS 10 ... Head-up display apparatus 13 ...

Indicator

14, 74 ... 1st mirror 16 ... 2nd mirror 20 ... Case 23 ... 1st shielding part 24 ... 2nd shielding part

Claims

A display that emits display light; a first mirror that reflects display light emitted from the display; a second mirror that reflects display light reflected from the first mirror; the display; A case for storing the first and second mirrors;
The mirror surface of the first mirror has a substantially rectangular shape in front view and is formed in a concave surface along the short axis,
The curvature of the concave surface is a curvature that causes the reflected display light to cross up and down before reaching the second mirror,
The mirror surface of the second mirror is formed as a concave surface that reflects the received display light,
The case includes a first shielding portion and a second shielding portion that extend to the vicinity of the crossing point that crosses the optical path between the first and second mirrors,
In the head-up display device in which outside light entering the case from outside the case, reflected by the second concave mirror and directed toward the first concave mirror is shielded by the first and second shielding portions,
The head-up display device, wherein the mirror surface of the first mirror is formed in a curved shape along the longitudinal axis.