JP7176687B2 - vehicle display - Google Patents

Description

The present invention relates to a vehicle display device.

A display device that forms an image of a light source in the air by using a retroreflective member that reflects incident light in the direction of incidence and a light branching member that reflects a portion of the incident light and transmits a portion of the incident light. is known (see, for example, Patent Document 1). In this display device, part of the light from the light source is reflected by the light branching member and emitted to the retroreflective member. Part of the light retroreflected by the retroreflecting member passes through the light branching member and forms an image of the light source in the air. An image of a light source formed in the air is hereinafter referred to as an aerial image.

JP 2015-40944 A

When the display device described above is applied to display outside the body of a vehicle, for example, the distance from the light branching member to the aerial image ( It is desired to increase the pop-out amount of the aerial image hereinafter) as much as possible.

Since the aerial image is formed at a position symmetrical to the light source with respect to the light branching member, it has been necessary to increase the distance from the light source to the light branching member in order to increase the projection amount of the aerial image. However, vehicles are required to mount the display device in a limited space, and the device is required to be thin.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicular display device capable of increasing the projection amount of an aerial image while being thin.

One aspect of the present invention provides the following vehicle display devices [1] to [6] in order to achieve the above object.

[1] A light source, a retroreflective member that retroreflects incident light, and at least part of the light from the light source is reflected and emitted to the retroreflective member, and is retroreflected by the retroreflective member. and a light branching member that transmits at least part of the incident light, wherein the light retroreflected by the retroreflective member and transmitted through the light branching member forms an image of the light source in the air. and a reflective member that reflects the light from the light source and enters the light branching member.

[2] The reflecting member according to [1], wherein the reflecting member has a reflecting mirror having a concave curved reflecting surface, and the distance between the light source and the reflecting mirror is shorter than the focal length of the reflecting mirror. vehicle display device.

[3] The vehicular display device according to [2], wherein the reflecting mirror is a concave mirror having a concave spherical reflecting surface.

[4] The reflecting member has a plurality of reflecting mirrors, and is configured such that the light from the light source is sequentially reflected by the plurality of reflecting mirrors and emitted to the light branching member, [1] The vehicle display device according to any one of [3].

[5] The vehicle display according to any one of [1] to [4], wherein the light source, the retroreflective member, the light branching member, and the reflecting member are integrally provided by a molded member. Device.

[6] The vehicular display device according to any one of [1] to [5], which is attached to a vehicle body and configured to form an image of the light source on the outside of the vehicle body. .

ADVANTAGE OF THE INVENTION According to this invention, the display apparatus for vehicles which can enlarge the amount of projections of an aerial image can be provided, although it is thin.

FIG. 1 is a schematic configuration diagram of a vehicle display device according to an embodiment of the present invention. FIG. 2(a) is a schematic configuration diagram when the vehicle display device of FIG. 1 is attached to a vehicle, and FIG. 2(b) is a diagram showing an example of display of an aerial image outside the vehicle body. 3(a) is a perspective view showing a reflecting member, FIG. 3(b) is a perspective view showing a modification of the reflecting member, and FIG. 3(c) is a modification of the present invention. It is a schematic block diagram of the display apparatus for vehicles which concerns. 4(a) and 4(b) are schematic configuration diagrams of a vehicle display device according to a modified example of the present invention. FIG. 5 is a schematic configuration diagram of a vehicle display device according to a modified example of the present invention.

[Embodiment]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings.

(Overall Configuration of Vehicle Display Device)
FIG. 1 is a schematic configuration diagram of a vehicle display device according to the present embodiment. As shown in FIG. 1 , the vehicle display device 1 includes a light source 2 , a retroreflection member (retroreflector) 3 , a light branching member (beam splitter) 4 , and a reflection member 5 .

As the light source 2, for example, a plate-shaped indicator in which a plurality of LEDs (light emitting diodes) are arranged can be used. Moreover, as the light source 2, for example, one having one or more LEDs and a diffuser for diffusing the light from the LEDs can be used. Further, as the light source 2, a display such as a liquid crystal display can be used.

The retroreflective member 3 is a member that retroreflects incident light in an incident direction. A sheet-shaped retroreflective sheet can be used as the retroreflective member 3 . As the retroreflective member 3, a member having a generally used structure, for example, a member using glass beads or a member using a prism can be used.

The light branching member 4 is formed in a plate shape, and reflects a part of incident light and transmits a part of the light. A half mirror can be used as the light branching member 4 . The light splitting member 4 is not limited to a half mirror, and may be a plate-like member made of acrylic or glass, a plate having rows of apertures such as punching metal, a wire grid film, a reflective polarizing film, and others, which are generally called beam splitters. can be used.

The light branching member 4 reflects at least part of the light from the light source 2 and emits it to the retroreflecting member 3 , and transmits at least part of the incident light retroreflected by the retroreflecting member 3 . As a result, the light retroreflected by the retroreflection member 3 and transmitted through the light branching member 4 forms an image of the light source 2 in the air. The image of the light source 2 formed in the air is hereinafter referred to as an aerial image 6 . Also, the distance from the light branching member 4 to the aerial image 6 is referred to as the projection amount of the aerial image 6 .

(Reflective member 5)
The vehicular display device 1 according to the present embodiment is configured such that the light from the light source 2 is reflected by the reflecting member 5 and enters the light branching member 4 . Light from the light source 2 is incident on the light branching member 4 after being reflected by the reflecting member 5 , and part of the incident light is reflected to the retroreflective member 3 .

With this configuration, a virtual image 7 of the light source 2 is formed by the reflecting member 5, and the virtual image 7 of the light source 2 is formed as an aerial image 6 in the air. That is, in the present embodiment, the aerial image 6 is formed at a position symmetrical to the virtual image 7 of the light source 2 with respect to the light branching member 4 . As a result, it becomes possible to form the aerial image 6 at a position relatively distant from the light branching member 4 without making the light source 2 or the reflecting member 5 far away from the light branching member 4 . It is possible to reduce the thickness of the vehicle display device 1 while increasing the amount of protrusion of the .

As the reflecting member 5, it is desirable to use a material having a reflectance as high as possible in order to avoid loss of light, and it is preferable to use a material having a reflectance of 80% or more, more preferably 90% or more, of the light from the light source 2. desirable.

In this embodiment, as the reflecting member 5, a concave mirror 51 having a reflecting surface 5a formed into a concave spherical surface is used. As a result, by arranging the light source 2 at a position closer than the focal length of the concave mirror 51, the virtual image 7 of the light source 2 is formed at a position farther from the light branching member 4, and the projection amount of the aerial image 6 is increased. can do. In this embodiment, in order to make the concave mirror 51 thinner, the concave mirror 51 is composed of a reflective Fresnel lens.

Further, by using the concave mirror 51 as the reflecting member 5, the virtual image 7 (that is, the aerial image 6) of the light source 2 is enlarged more than the size of the light source 2. Therefore, even if the size of the light source 2 is small, the aerial image is large. 6 can be imaged. Therefore, the size of the light source 2 can be reduced, and the vehicle display device 1 that is compact and can be mounted in a smaller space can be realized.

Also, the light branching member 4 and the reflecting member 5 (the surface orthogonal to the optical axis 511) are non-parallel. It is preferable that the distance between the reflecting member 5 and the light branching member 4 is narrow on the light source 2 side and wide on the retroreflective member 3 side. As a result, more light can be reflected toward the light branching member 4, and the aerial image 6 can be made brighter.

(Application to vehicles)
FIG. 2(a) is a schematic configuration diagram when the vehicle display device 1 of FIG. 1 is attached to a vehicle, and FIG. 2(b) is a diagram showing an example of display of an aerial image 6 outside the vehicle body. be. As shown in FIGS. 1 and 2(a) and (b), the vehicle display device 1 is attached to a vehicle body 11 of a vehicle 10 and configured to form an aerial image 6 on the outside of the vehicle body 11. ing. In the present embodiment, the vehicle display device 1 is provided at a back door (rear hatch) 12 of a vehicle 10 and configured to form an aerial image 6 behind the back door 12 .

In the vehicle display device 1, the concave mirror 51 is provided on the outer surface of the sheet metal 121 on the outside of the back door 12, and is provided so that the optical axis 511 of the concave mirror 51 is oriented rearward and upward (diagonally upward) of the vehicle 10. ing. A light source 2 and a light branching member 4 are provided so as to face the concave mirror 51 . Here, the case where the light source 2 and the light branching member 4 are provided on substantially the same plane is shown, but the present invention is not limited to this, and the light branching member 4 is extended so as to cover the back surface of the light source 2, The light source 2 may be arranged closer to the concave mirror 51 than the light branching member 4 is.

The light source 2 is arranged below the optical axis 511 of the concave mirror 51 in the vertical direction. That is, the optical axis 511 of the concave mirror 51 is removed and the light source 2 is arranged on the reflecting surface 51a side of the optical axis 511 . The retroreflective member 3 is arranged below the concave mirror 51 in the vertical direction. If the light source 2 is arranged above the optical axis 511, the light returns upward and does not function (the light is no longer emitted to the retroreflective member 3 side). The retroreflection member 3 is arranged so that the angle of inclination with respect to the horizontal direction is smaller than that of the light branching member 4 .

The rear of the light branching member 4 is covered with a cover 8 made of resin. A portion of the cover 8 through which the light from the retroreflective member 3 to the aerial image 6 passes through the light branching member 4 is composed of a member that transmits at least part of the light. In this embodiment, the cover 8 also serves to cover the number lamp 13 that illuminates the license plate (not shown). The retroreflective member 3 is provided so as to block the space between the metal plate 121 and the cover 8 in order to block the light from the license plate light 13. - 特許庁The retroreflective member 3 is configured such that its front surface (upper surface in the drawing) retroreflects, and its back surface (lower surface in the drawing) is a member capable of blocking light from the license plate light 13. (for example, a black resin layer, etc.). In addition, reference numeral 122 in FIG. 2( a ) represents the inner layer trim of the back door 12 .

In the present embodiment, the light that forms the aerial image 6 passes through the curved cover 8 , so the cover 8 may distort the aerial image 6 . Therefore, cover distortion correcting means for correcting the distortion of the aerial image 6 due to the influence of the cover 8 may be further provided. As the cover distortion correcting means, for example, a member capable of correcting the distortion due to the cover 8 (such as a member made of the same material as the cover 8 but having a shape opposite to that of the cover 8) is arranged between the concave mirror 51 and the light source 2. For example, the original image itself of the light source 2 is changed so that the intended aerial image 6 can be obtained by being distorted by the influence.

As shown in FIG. 2B, the distance d from the cover 8 of the aerial image 6 (the amount of protrusion from the vehicle body 11) is at least 75 mm or more is desirable. In this embodiment, the vehicle display device 1 is configured such that the distance d is 75 mm or more and 120 mm or less. The distance d of the aerial image 6 from the cover 8 can be appropriately adjusted by the distance between the concave mirror 51 and the light source 2, the curvature of the reflecting surface 5a of the concave mirror 51, the distance between the concave mirror 51 and the light branching member 4, and the like. Further, in the present embodiment, the visual field is set so that the aerial image 6 can be seen from a position at a height H of 1380 mm or more and 1780 mm or less from the ground and a distance D of 450 mm or more and 750 mm or less behind the aerial image 6. adjusted. The adjustment of the field of view can be appropriately adjusted by the arrangement position and arrangement angle of each member (the light source 2, the concave mirror 51, the retroreflection member 3, and the light branching member 4).

(Modification)
In the present embodiment, a reflective Fresnel lens is used as the concave mirror 51 used in the reflecting member 5, but a normal concave mirror 51 may be used as shown in FIG. 3(a). In addition, when there is a limitation of arrangement space such as interference with other members, as shown in FIG. A mirror 52 can also be used. However, in this case, the imaging distance changes between the vertical direction and the horizontal direction, and the aerial image 6 is distorted. Therefore, as shown in FIG. is more desirable. When using a reflecting mirror 52 formed so that the reflecting surface 5a is a part of a cylinder as shown in FIG. 3(b), means for correcting this distortion may be added. As means for correcting the distortion of the aerial image 6, for example, a member (such as a lens) capable of correcting the distortion caused by the reflecting mirror 52 is arranged between the reflecting mirror 52 and the light source 2, or the distortion caused by the reflecting member 5 is arranged. For example, the original image itself of the light source 2 is changed so that the intended aerial image 6 can be obtained.

As described above, the reflecting member 5 is preferably a reflecting mirror having a concave curved reflecting surface 5a. By making the distance between the light source 2 and the reflecting mirror shorter than the focal length of the reflecting mirror, The projection amount of the image 6 can be increased.

Further, in this embodiment, one concave mirror 51 is used as the reflecting member 5, but as shown in FIG. 3C, a plurality of concave mirrors 51 may be used as the reflecting member 5. In this case, the light from the light source 2 is sequentially reflected by the plurality of concave mirrors 51 and emitted to the light branching member 4 . By combining a plurality of concave mirrors 51, it is possible to further increase the projection amount of the aerial image 6. - 特許庁Although the case of using two concave mirrors 51 is shown here, three or more concave mirrors 51 may be used. However, the more concave mirrors 51 are used, the narrower the field of view in which the aerial image 6 can be visually recognized.

When using two concave mirrors 51, the radius of curvature of the concave mirror 51a on the side of the light source 2 (the concave mirror 51 into which the light is directly incident from the light source 2) is the same as that of the concave mirror 51b on the side of the light branching member 4 (the concave mirror 51b on the side of the light branching member 4). The aerial image 6 can be made larger by making it larger than the radius of curvature of the concave mirror 51). Further, by making the radius of curvature of the concave mirror 51a on the light source 2 side smaller than that of the concave mirror 51b on the light branching member 4 side, the viewing angle of the aerial image 6 can be increased.

Furthermore, as shown in FIG. 4A, a plane mirror 53 may be used as the reflecting member 5. FIG. In this case, although the projection amount of the aerial image 6 is smaller than that of the above-described concave mirror 51 , the aerial image 6 is larger than the case where the light from the light source 2 is directly incident on the light branching member 4 without using the reflecting member 5 . The amount of protrusion can be increased. Even when a plane mirror 53 is used as the reflecting member 5, as shown in FIG. 4B, a plurality of plane mirrors 53 can be used to increase the projection amount of the aerial image 6. FIG. Since the plane mirror 53 can be made thinner than the concave mirror 51, it can be arranged in a narrower space.

Furthermore, as shown in FIG. 5, the light source 2, the retroreflecting member 3, the light branching member 4, and the reflecting member 5 may be integrally provided by the molding member 9. FIG. As a result, it is possible to suppress relative positional deviation of each member due to vibration, and to suppress defects such as distortion of the aerial image 6 due to positional deviation of each member. As the mold member 9, it is preferable to use a material that is transparent (has a high transmittance) with respect to the light emitted from the light source 2. For example, an acrylic resin, an epoxy resin, a silicone resin, or the like can be used. As the mold member 9 other than resin, an inorganic transparent material can be used, and glass or the like can be used. When the molding member 9 is used, the reflecting member 5 is formed by forming a highly reflective metal film on the surface of the molding member 9 by appropriate means (for example, film formation by vapor deposition, attachment of metal foil, etc.). can also be formed.

(Actions and effects of the embodiment)
As described above, the vehicular display device 1 according to the present embodiment includes the reflecting member 5 that reflects the light from the light source 2 and enters the light branching member 4 . By forming a virtual image of the light source 2 with the reflecting member 5 , the aerial image 6 is formed at a position opposite to the virtual image with respect to the light branching member 4 . As a result, compared with the case where the light is directly incident on the light branching member 4 from the light source 2, the projection amount of the aerial image 6 can be increased, and the projection amount of the aerial image 6 is large even when the vehicle is thin. A display device 1 is obtained. In the vehicle 10, the mounting space is severely limited, but according to the present embodiment, it is possible to realize the vehicle display device 1 that can be mounted in a very narrow (thin) space.

Although the embodiments and examples of the present invention have been described above, the present invention is not limited to the above-described embodiments and examples, and various modifications can be made without departing from the scope of the invention.

For example, in the above embodiment, the case where the vehicle display device 1 is provided on the back door 12 of the vehicle 10 has been described, but the installation position of the vehicle display device 1 is not limited to this.

Moreover, the above embodiments and examples do not limit the invention according to the scope of claims. Also, it should be noted that not all combinations of features described in the embodiments and examples are essential to the means for solving the problems of the invention.

1 vehicle display device 2 light source 3 retroreflective member 4 light branching member 5 reflective member 5a reflective surface 51 concave mirror 6 aerial image 7 virtual image 9 mold member 10 vehicle 11 vehicle body

Claims (6)

a light source;
a retroreflective member that retroreflects incident light;
a light branching member that reflects at least part of the light from the light source and emits it to the retroreflective member, and transmits at least part of the incident light retroreflected by the retroreflective member;
The light retroreflected by the retroreflective member and transmitted through the light branching member forms an image of the light source in the air,
and a reflecting member that reflects the light from the light source and enters the light branching member ;
The reflecting member has a reflecting mirror having a concave curved reflecting surface,
the distance between the light source and the reflector is shorter than the focal length of the reflector;
Vehicle display. wherein the reflecting mirror is a concave mirror having a reflecting surface formed on a concave spherical surface;
The vehicle display device according to claim 1 . The reflecting member has a plurality of reflecting mirrors, and is configured to sequentially reflect light from the light source by the plurality of reflecting mirrors and emit the light to the light branching member.
The vehicle display device according to claim 1 or 2 . attached to the vehicle body of the vehicle, and configured to form an image of the light source on the outside of the vehicle body;
The vehicle display device according to any one of claims 1 to 3 . a light source;
a retroreflective member that retroreflects incident light;
a light branching member that reflects at least part of the light from the light source and emits it to the retroreflective member, and transmits at least part of the incident light retroreflected by the retroreflective member;
The light retroreflected by the retroreflective member and transmitted through the light branching member forms an image of the light source in the air,
and a reflecting member that reflects the light from the light source and enters the light branching member;
wherein the light source, the retroreflective member, the light branching member, and the reflecting member are integrally provided by a molding member;
Vehicle display. attached to the vehicle body of the vehicle, and configured to form an image of the light source on the outside of the vehicle body;
The vehicle display device according to claim 5 .

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