WO2013128615A1

WO2013128615A1 - Head-up display

Info

Publication number: WO2013128615A1
Application number: PCT/JP2012/055261
Authority: WO
Inventors: 吉田　正; 中村　健二; 大将田淵; 賢司児玉; 敬高国丸
Original assignee: パイオニア株式会社
Priority date: 2012-03-01
Filing date: 2012-03-01
Publication date: 2013-09-06

Abstract

This head-up display is mounted on a moving body such as a vehicle and is provided with a light source and an optical member. The light source emits, in the direction of travel of the moving body, light corresponding to an image to be displayed. A part of the light emitted from the light source is reflected by the optical member and reaches the user, and in this way, the user perceives the image as a virtual image. The optical member is provided with a louver structure comprising multiple slats arranged at prescribed angles on the surface of said optical member. Thus, even when light emitted from the light source propagates in the direction of travel of the moving body, such light is blocked by the louver structure of the optical member so that the amount of light that reaches a person who is coming from the opposite direction and located in front of the moving vehicle will be sufficiently decreased.

Description

Head-up display

The present invention relates to a display device that allows a user to visually recognize a virtual image.

A head-up display that is installed near the driver's seat of a vehicle is known. For example, Patent Literature 1 discloses a head-up display that includes a light source unit and a combiner and is installed on a vehicle interior ceiling. In this head-up display, a display image is reflected by a combiner so as to be visually recognized by a user.

Japanese Patent No. 4847627

In a head-up display that emits light from the light source in the direction of travel of the vehicle, the image projected from the light source to the combiner passes through the combiner, and the person on the opposite side of the light source across the combiner (hereinafter referred to as “opposite”) May be seen.) Even if the image itself is not clearly visible, the light from the light source reaches the opponent, so the opponent may feel dazzling.

The above are examples of problems to be solved by the present invention. An object of the present invention is to provide a head-up display capable of reducing the light emitted from the light source and reaching the opponent without reducing the visibility of the display image by the user.

The invention according to claim 1 is a head-up display mounted on a moving body, and a light source that emits light that forms an image to be visually recognized by a user, and a part of the light emitted from the light source is reflected. And an optical member that allows the user to visually recognize the image as a virtual image, and the light source is disposed so as to emit the light toward a traveling direction of the moving body, and the optical member includes the moving body. And a louver structure having a plurality of slats arranged at a predetermined angle with respect to the surface of the optical member.

It is a figure which shows typically the head up display which concerns on an Example. It is a figure which shows the structure of a head-up display. It is a figure explaining the louver structure of a combiner. It is a figure which shows the other example of the louver structure of a combiner. It is a figure explaining the effect by an Example. It is a figure explaining the effect by an Example.

In a preferred embodiment of the present invention, a head-up display mounted on a moving body reflects a light source that emits light that forms an image to be visually recognized by a user and a part of the light emitted from the light source. An optical member that allows a user to visually recognize the image as a virtual image, and the light source is arranged to emit the light toward a traveling direction of the moving body, and the optical member is a traveling body of the moving body. A louver structure having a plurality of slats aligned at a predetermined angle with respect to the surface of the optical member.

The head-up display is mounted on a moving body such as a vehicle, and includes a light source and an optical member. The light source emits light corresponding to the image to be displayed in the traveling direction of the moving body. A part of the light emitted from the light source is reflected by the optical member and reaches the user, whereby the user recognizes the image as a virtual image. The optical member includes a louver structure having a plurality of slats arranged at a predetermined angle with respect to the surface thereof. Therefore, even if the light emitted from the light source travels in the traveling direction of the moving body, it is shielded by the louver structure of the optical member, so that the light reaching the opponent or the like positioned in front of the moving body is sufficiently reduced.

In one aspect of the above-described head-up display, the optical member has a concave structure in which a concave surface having a predetermined curvature faces the user, and the plurality of blades with respect to the surface of the optical member The direction is reversed with the vertex of the concave structure as a boundary. In another aspect, the optical member has a rectangular shape, the direction of a plurality of blades provided on one end side of the optical member around the center in the longitudinal direction of the optical member, and the other of the optical member The directions of the plurality of slats provided on the end side are substantially line symmetric. Thereby, the optical member can shield the light emitted from the light source in both the left and right directions.

In another aspect of the head-up display, the plurality of wing plates may have an angle with respect to the surface of the optical member toward the end side of the optical member with respect to the center in the longitudinal direction of the optical member. It is getting smaller. This prevents light emitted from the light source from spreading in the width direction of the optical member.

In another aspect of the head-up display, the plurality of blades are not provided in a predetermined range from the center in the longitudinal direction of the optical member. Thereby, the user can fully visually recognize the scenery in the forward direction.

In a preferred example, the louver structure is provided on the surface of the optical member opposite to the surface facing the user.

In another aspect of the above head-up display, each of the plurality of slats is more in the longitudinal direction of the optical member than in the direction parallel to the direction connecting the light source and the center in the longitudinal direction of the optical member. It faces inward. This prevents light emitted from the light source from spreading in the left-right direction beyond the width of the optical member.

In a preferred example, the louver structure is provided more inside than the surface of the optical member. Thereby, it can prevent that dust and dust accumulate in the part in which the louver structure was provided.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[Constitution]
FIG. 1 schematically shows a state in which a head-up display (hereinafter referred to as “HUD”) 10 according to an embodiment is installed in a vehicle cabin. FIG. 1 is a side view of the driver's seat of the vehicle 1, and a user 7 who is a driver's car is sitting on a seat 5 in the passenger compartment. There is a roof 2 of the vehicle above the user 7 and a ceiling 3 of the passenger compartment below. Further, there is a windshield 4 of the vehicle 1 in front of the user 7.

The HUD 10 is installed diagonally upward in front of the user 7. Although details will be described later, the HUD 10 includes a light source unit 11 and a combiner 12. The light source unit 11 emits light that forms a display image to be visually recognized by the user as a virtual image in the traveling direction of the vehicle. As indicated by a broken line, a part of the light emitted from the light source unit 11 is reflected by the combiner 12 and reaches the eyes of the user 7. Thereby, the user 7 visually recognizes the virtual image VI corresponding to the display image in front of the vehicle. In the virtual image VI, the tip of the arrow indicates the upward direction.

FIG. 2 shows the configuration of the HUD 10. The HUD 10 includes a light source unit 11, a combiner 12, and a pair of arms 14. The light source unit 11 and the combiner 12 are connected by a pair of arms 14. That is, the pair of arms 14 extending from the light source unit 11 holds the combiner 12 so as to sandwich the left and right sides.

The light source unit 11 includes a light source 11x inside. The light source 11x emits light L1 that forms a display image that is visually recognized by the user as a virtual image. The light source 11x emits light L1 in front of the vehicle, that is, in the traveling direction of the vehicle.

The combiner 12 has a predetermined transmittance and reflectance. A part of the light L1 emitted from the light source 11x is reflected by the combiner 12 and reaches the eyes of the user 7, and a part of the light L1 passes through the combiner 12 and reaches outside the vehicle. Further, external light L2 from the front of the vehicle passes through the combiner 12 and reaches the eyes of the user 7. Thereby, the user 7 visually recognizes the scenery in front of the vehicle through the combiner 12.

The combiner 12 includes a louver structure 13 having a plurality of slats. The louver structure 13 will be described in detail with reference to FIG. FIG. 3A is a plan view of the combiner 12 as viewed from above, and FIG. 3B is a front view of the combiner 12 as viewed from the user 7 in FIG.

As shown, the combiner 12 has a rectangular flat plate shape. The combiner 12 is curved with a predetermined curvature, and has a concave inner surface 12m and a convex outer surface 12n. The combiner 12 is arrange | positioned so that the concave inner side surface 12m may oppose the user 7, and has comprised the concave structure. In FIG. 3B, the X direction is the longitudinal direction of the rectangular combiner 12, and the Y direction is the short direction of the combiner 12. The Z direction is the traveling direction of the vehicle.

The combiner 12 is provided with a louver structure 13 composed of a plurality of blades 13a on the surface opposite to the user 7, that is, the surface of the outer surface 12n. The louver structure 13 has a function of blocking the light L1 emitted from the light source 11x so that the light L1 cannot be seen by the opponent facing the HUD 10.

The louver structure 13 is arranged in the left-right direction toward the traveling direction of the vehicle as a moving body. More specifically, as shown in FIG. 3 (B), the plurality of slats 13a are provided in the entire short direction (Y direction) of the combiner 12, that is, from the upper end to the lower end. Further, the plurality of slats 13 a are arranged side by side in the longitudinal direction (X direction) of the combiner 12. Each vane 13a is provided so as to have a predetermined angle with respect to the outer surface 12n of the combiner 12.

When viewed from the user 7 side, the combiner 12 is divided into a central portion 12C, a right portion 12R including a right end portion, and a left portion 12L including a left end portion, and the plurality of blades 13a are divided into a right portion 12R and a left portion 12L. Although provided, it is not provided in the central portion 12C. The central portion 12C corresponds to a range of a predetermined length from the longitudinal center of the combiner 12.

In FIG. 3A, when the direction connecting the user 7 and the center of the combiner 12 in the longitudinal direction is the Z-axis direction, the directions of the plurality of blades 13a are respectively inward of the directions parallel to the Z-axis direction. It is suitable. In other words, the plurality of blades 13a are provided on the outer surface 12n in a state of being inclined toward the center in the longitudinal direction of the combiner 12 with respect to the direction parallel to the Z-axis direction. Thereby, the louver structure 13 including the plurality of blades 13a prevents the light L1 emitted from the light source 11x from spreading outward beyond the lateral width of the combiner 12, that is, the width in the longitudinal direction.

The direction of the plurality of blades 13a provided on the left portion 12L of the combiner 12 and the direction of the plurality of blades 13a provided on the right portion 12R of the combiner 12 are the center in the longitudinal direction of the user 7 and the combiner 12 Is substantially line symmetric with respect to the Z axis connecting In other words, the direction of the slats 13a provided on the right side and the direction of the slats provided on the left side are reversed with respect to the center of the combiner 12 in the longitudinal direction. The center in the longitudinal direction of the combiner 12 corresponds to the apex of the concave structure of the combiner 12.

The plurality of slats 13a are provided to be inclined with respect to the outer surface 12n of the combiner 12 toward the outer side in the longitudinal direction of the combiner 12, that is, toward the end. In other words, the mounting angle α (see FIG. 3C) of the wing plate 13a with respect to the outer surface 12n of the combiner 12 becomes smaller toward the end of the combiner. Thus, the light L1 traveling toward the side of the vehicle is surely blocked toward the end of the combiner 12 in the longitudinal direction.

On the other hand, since the light L1 emitted from the light source 11x and passing through the central portion 12C in the longitudinal direction of the combiner 12 does not travel to the left and right sides of the vehicle, it is necessary to provide the louver structure 13 composed of the blades 13a in the central portion 12C. There is no. For this reason, the louver structure 13 is not provided in the central portion 12 </ b> C of the combiner 12.

Next, the shape of the louver structure 13 will be described in detail. FIG. 3C is an enlarged view of a part of the louver structure 13. Specifically, FIG. 3C is an enlarged view of the right portion 12R and the central portion 12C of the combiner 12 shown in FIG. FIG. 3C is a plan view of the combiner 12 as viewed from above, as in FIG.

The plurality of slats 13a constituting the louver structure 13 allows the user 7 to recognize the scenery in front of the vehicle through the combiner 12, and emits from the light source 11x to the opponent who is in a predetermined range with respect to the HUD 10. Are formed with a width w, a distance d, and an angle α that can block the light L1. As an example, the louver structure 13 prevents the light L1 from being visually recognized by a driver of an oncoming vehicle located in the range of 0 to 50 m on the right front and a pedestrian located in the range of 0 to 50 m on the left front. The width, interval, and angle of the plurality of slats 13a are determined.

Since the louver structure 13 is not provided in the central portion 12C of the combiner 12, the light L1 emitted from the light source 11x passes through the central portion 12C as it is, but the light L1 transmitted through the central portion 12C travels forward of the vehicle. There is almost no influence on the oncoming vehicle 8 on the left and right sides of the vehicle. On the other hand, the plurality of blades 13 a formed on the left portion 12 </ b> L and the right portion 12 </ b> R of the combiner 12 are provided so as to be inclined toward the left and right ends of the combiner 12. As shown in FIG. 3C, the light L1 emitted from the light source 11x travels at a larger angle β with respect to the Z-axis direction as it goes to the left and right ends of the combiner 12. Since the inclination of the plate 13a is large (the angle α is small), the louver structure 13 effectively blocks the light L1 traveling to the left and right sides of the vehicle.

On the other hand, since the external light L2 incident on the combiner 12 from the front of the vehicle is parallel light, the external light L2 is blocked by the wing plate 13a if the wing plates 13a constituting the louver structure 13 are formed at a certain distance d. The combiner 12 is transmitted without being transmitted. Therefore, not only the central portion 12C of the combiner 12 but also the left portion 12L and the right portion 12R of the combiner 12 where the louver structure 13 is provided, the user 7 can view the scenery in front of the vehicle without being blocked by the louver structure 13. It can be visually recognized.

The louver structure 13 having a plurality of blades 13a can be provided directly on the outer surface 12n of the combiner 12 by microfabrication. Instead, a louver structure 13 having a plurality of blades 13 a can be formed on a sheet or the like, and the sheet can be attached to the outer surface 12 n of the combiner 12. The louver structure 13 can also be provided by printing on the outer surface 12 n of the combiner 12.

In addition, since the louver structure 13 provided in the combiner 12 has fine irregularities, dust, dust, and the like are likely to accumulate if left in an exposed state. When dust or dust accumulates in the combiner 12, the visibility of the display image by the user 7 decreases. Therefore, as shown in FIG. 4A, a transparent protective sheet 17 or the like may be attached to the outer surface 12n of the combiner 12 provided with the louver structure 13. Further, instead of the protective sheet 17, a protective coating may be applied with a transparent resin or the like.

Further, in order to prevent dust and dust, a sheet having a louver structure 13 formed inside may be attached to the combiner 12. FIG. 4B shows this example. The louver structure 13 is formed on the inner side of the sheet 13x, that is, on the side to be bonded to the outer surface 12n of the combiner 12. The outer surface of the sheet 13x, that is, the surface opposite to the combiner 12, is a flat surface without unevenness. If this sheet 13x is affixed to the combiner 12, dust and dust can be prevented from accumulating in the louver structure 13.

Next, the effect of the louver structure 13 will be described. First, as a comparative example, FIGS. 5A and 6A show an example in which a combiner without the louver structure 13 is used. FIG. 5A schematically shows the state of the HUD 10 viewed from the side, and FIG. 6A schematically shows the state of the HUD 10 viewed from above.

The light source 11x emits light L1 corresponding to the image 21 to be visually recognized by the user 7 toward the combiner 12. A part of the light L1 is reflected by the combiner 12 and reaches the eyes of the user 7. Moreover, since the combiner 12 has transparency, the scenery 22 in front of the vehicle passes through the combiner 12 as external light L2 and reaches the eyes of the user 7. Therefore, the user 7 visually recognizes the scenery 22 and the image 21 as indicated by reference numeral 23.

On the other hand, a part of the light L1 emitted from the light source 11x passes through the combiner 12 and reaches the opponent 8 located on the right front side of the vehicle. Therefore, the opponent 8 visually recognizes the image 21 emitted from the light source 11 x as indicated by reference numeral 24. Even if the image 21 is not clearly visible, the opponent 8 recognizes the light L1. As the opponent 8, a driver of a vehicle traveling in the opposite lane, a pedestrian, or the like can be considered.

Next, an example in which the louver structure 13 is provided according to this embodiment is shown in FIGS. 5 (B) and 6 (B). FIG. 5B schematically shows the state of the HUD 10 viewed from the side, and FIG. 6B schematically shows the state of the HUD 10 viewed from above.

As in the case of FIGS. 5A and 6A, the user 7 visually recognizes the image 21 and the scenery 22 in front of the vehicle as indicated by reference numeral 23.

On the other hand, a part of the light L1 emitted from the light source 11x enters the combiner 12, but is blocked by the louver structure 13 formed on the outer surface 12n of the combiner 12, so that the amount of the light L1 that goes out of the vehicle is sufficient. Reduced to In particular, as shown in FIG. 6B, the plurality of slats 13 a constituting the louver structure 13 are provided at positions from both ends of the combiner 12 so as to be inclined toward the center of the combiner 12. The light L1 is prevented from spreading in the left-right direction (longitudinal direction of the combiner 12). For this reason, it is prevented that the opposing person 8 located in the left-right side of a vehicle recognizes the image 21 and light L1.

As described above, in this embodiment, by providing the fine louver structure 13 on the outer surface 12n of the combiner 12, the light L1 emitted from the light source 11x and the image 21 corresponding thereto are recognized by the opponent 8 outside the vehicle. Can be effectively prevented.

[Modification]
In the above example, the slats 13a constituting the louver structure 13 are provided in parallel to the short direction (Y direction) of the combiner 12, but instead, provided in parallel to the long direction (X direction) of the combiner 12. May be.

The present invention can be used for a display system using a transmissive display. In particular, it can be used for a head-up display installed on a moving body such as a vehicle.

1 Vehicle 3 Ceiling 4 Windshield 7 User 10 Head Up Display (HUD)
DESCRIPTION OF SYMBOLS 11 Light source part 12 Combiner 13 Louver structure 13a Wing board VI Virtual image

Claims

A head-up display mounted on a moving body,
A light source that emits light that forms an image to be visually recognized by the user;
An optical member that reflects a part of the light emitted from the light source and causes the user to visually recognize the image as a virtual image,
The light source is arranged to emit the light toward the traveling direction of the moving body,
The optical member is provided with a louver structure having a plurality of blades aligned in a left-right direction toward a traveling direction of the moving body and arranged at a predetermined angle with respect to a surface of the optical member. Head-up display.
The optical member has a concave structure in which a concave surface having a predetermined curvature is arranged to face the user,
2. The head-up display according to claim 1, wherein directions of the plurality of blades with respect to a surface of the optical member are reversed with a vertex of the concave structure as a boundary.
The angle between the plurality of slats with respect to the surface of the optical member becomes smaller toward the end of the optical member with respect to the center in the longitudinal direction of the optical member. Or the head-up display of 2.
The optical member has a rectangular shape, and is provided on the other end side of the optical member and the direction of a plurality of blades provided on one end side of the optical member with the center in the longitudinal direction of the optical member as a center. The head-up display according to any one of claims 1 to 3, wherein directions of the plurality of slats are substantially line symmetrical.
The head-up display according to any one of claims 1 to 4, wherein the plurality of blades are not provided in a predetermined range from the longitudinal center of the optical member.
The head-up display according to any one of claims 1 to 5, wherein the louver structure is provided on a surface of the optical member opposite to a surface facing the user.
Each of the plurality of slats faces an inner side in the longitudinal direction of the optical member rather than a direction parallel to a direction connecting the light source and a center in the longitudinal direction of the optical member. The head-up display according to any one of 1 to 6.
The head-up display according to any one of claims 1 to 7, wherein the louver structure is provided inside a surface of the optical member.