JPH05278521A - Rearward display device for automobile - Google Patents

Abstract

PURPOSE:To provide a rearward display device for an automobile capable of clearly displaying various kinds of messages as well as stop display in the rearward direction of automibile. CONSTITUTION:A display 3 is set inside of a roof spoiler positioned at the rear end of roof. The display 3 radiates display light downward. A reflection type hologram 4 is attached to a rear windshield just below the display 3. The display light radiated from the display impinges on the hologram 4 to display in the rearward direction while being reflected rearward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear display device for an automobile, which displays a stop display and various messages on the rear of the automobile.

[0002]

2. Description of the Related Art In recent years, automobiles in which a high-mount type stop lamp is installed on a rear tray of the automobile so that the driver of the following vehicle can recognize the driver more clearly are becoming popular. However, in vehicles equipped with this type of stop lamp, a high-mounted stop lamp easily obstructs the driver's rear view, and also narrows the space on the rear tray,
There was a problem that the external design was also easily damaged.

[0003]

Therefore, conventionally, as shown in FIG. 7, a transmissive hologram 22 is attached to a rear window glass 21 of an automobile, and a light source 23 for emitting reference light is provided below the rear tray. There is proposed a device which is provided and irradiates the hologram 22 with reference light, and emits, for example, red light for stop display to the rear of the automobile through the hologram 22 (see Japanese Patent Publication No. 1-502465).

However, the rear display device using this holography is effective in that it does not obstruct the driver's rear view and does not narrow the space on the rear tray. However, since a transmission hologram is used, a plurality of colors are displayed. When it is desired to display the used message, there is a problem in that light of a plurality of colors that passes through the hologram is dispersed to cause a color shift in the displayed hologram image, resulting in a decrease in display clarity.

The present invention has been made in view of the above points, and an object of the present invention is to provide a rear display device for a vehicle, which can clearly display a stop display and various messages at the rear of the vehicle. ..

[0006]

To this end, a rear display device for an automobile according to the present invention is provided inside a roof spoiler located at a rear end of a roof, and a display device that emits display light downward. And a reflection hologram attached to a rear window glass directly below the display, and configured so that display light emitted from the display is applied to the reflection hologram and reflected to the rear of the vehicle to perform rear display. It

[0007]

In the rear display device for an automobile constructed as described above, for example, a large number of LEDs are arranged so as to show characters and figures to form a display, and the reflection hologram has a predetermined wavelength (color). ) And a holographic layer that reflects light of a predetermined incident angle are formed, and are used to illuminate and display a display according to a brake operation or the like operated by a driver.

When the display is turned on, the display light emitted downward from the display hits the hologram directly below. In the hologram, light is reflected substantially horizontally only at a predetermined incident angle having a predetermined wavelength (for example, red or green), and a stop display and various messages can be displayed behind the automobile.

Since this rear display is performed by using a reflection hologram, it is possible to perform a clear display without causing color shift as in the case of using a conventional transmission hologram. Further, since the display is installed inside the roof spoiler, the space inside the vehicle is not narrowed and the external design is not deteriorated. In addition, the roof spoiler becomes a shade and sunlight is hard to hit the hologram on the rear window glass, and it does not cause glare to the driver,
It is possible to always secure a good rear view.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a rear display device for an automobile, and FIG. 2 is a perspective view of the mounted state. A roof spoiler 2 is attached to the rear end of the roof of this automobile, and is arranged so as to horizontally cover the upper portion of the rear window glass 1 from above.

Inside the roof spoiler 2, an indicator 3 is provided.
Is mounted so that the display surface faces downward and the display light is emitted downward. The display device 3 is formed, for example, by disposing a large number of LEDs on the display surface. For example, as shown in FIG.
Characters and the like are formed by the arrangement of D. LE such as red and green
D can also be used to form multiple color display surfaces.

Further, here, since the display light is used after being reflected, the characters and the like on the display surface are inverted like mirror characters as shown in FIG. Further, for example, a large number of green LEDs may be arranged as the background of the display surface, and characters and figures may be arranged in the background by the arrangement of the red LEDs to form the display surface. The display 3 is attached so that the angle can be adjusted.

On the other hand, a reflection hologram 4 is attached on the rear window glass 1 just below the display 3. The reflection hologram 4 is produced, for example, by exposing a hologram dry plate having a surface of a transparent film coated with a photosensitive material, with light of a predetermined wavelength (for example, red and green) at a predetermined incident angle.

The incident angle of exposure in that case is set according to the inclination angle of the rear window glass 1 of the automobile, and is set so that only the light from the display 3 is reflected.

The reflection hologram 4 manufactured in this way
As shown in FIG. 4, the reflectance of the incident light is extremely high for red (wavelength about 650 nm) and green (wavelength about 530 nm) light. Therefore, this reflection hologram 4
Is reflected in a predetermined direction with a very high reflectance only when red and green display lights are incident at a predetermined incident angle.

Such a reflection hologram 4 is adhered to the upper part of the rear window glass 1 directly below the display device 3 by an optical adhesive. The bonding surface may be the front surface, the back surface, or the inside of the rear window glass 1. Further, in a normal mirror, light is reflected so that the incident angle and the reflection angle are the same, but in the case of a reflection hologram, as shown in FIG. 5, the incident angle θ1 and the reflection angle θ2 are not necessarily the same. You don't have to. Therefore, even in a car having a large tilt angle α of the rear window glass 11 or a car having a small tilt angle α, various kinds of cars can be obtained if the incident angle of exposure is set according to the tilt angle of the rear window glass of the car when the hologram is manufactured. Can be adapted.

The rear display device thus constructed is used to light up the display unit 3 in response to a driver's switch operation or brake operation.

When the display device 3 is turned on, the display light emitted downward from the display device 3 hits the reflection hologram 4 directly below the display light. In the reflection hologram 4, light is reflected substantially horizontally only at a predetermined incident angle having a predetermined wavelength (for example, red or green) recorded during exposure, and a stop display and various messages are displayed behind the automobile.

The reflection hologram 4 reflects light having a specific incident angle at a specific wavelength with a high reflectance, but transmits light having other wavelengths / incident angle satisfactorily. Therefore, even if the reflection hologram 4 is attached to the rear window glass 1, the rear field of view of the driver is hardly disturbed, which is good.

Further, since the rearward display is performed by the reflection hologram 4, it is possible to perform a clear display without causing color shift unlike the case of using a conventional transmission hologram. Further, since the display device 3 is installed inside the roof spoiler 2, the interior space of the automobile is not narrowed and the external design is not deteriorated. Further, the roof spoiler 2 becomes a shade so that sunlight is hard to hit the hologram on the rear window glass 1, glare does not occur to the driver, and a good rear view can be always secured.

Since the reflection hologram 4 can be given a lens effect at the time of manufacture, if the lens effect of a convex lens is given to the hologram 4, the display contents such as a message can be enlarged and displayed. ..

FIG. 6 shows another embodiment in which a half mirror 14 is mounted on the rear window glass 1 directly below the display 3 instead of the hologram. Half mirror 1
Reference numeral 4 receives the display light emitted from the display device 3, reflects it toward the rear, and displays a message or the like on the rear by the display device 3 similarly to the above.

In the case of the half mirror, the incident angle and the reflection angle of the display light are the same, but if the inclination angle of the rear window glass 1 is about 45 degrees, the angle adjustment of the display unit 3
The display light can be reflected well in the rear horizontal direction. Further, the half mirror 14 cannot reflect only the light of the specific wavelength or the light of the specific incident angle like the hologram, but reflects the display light from the display device 3 to the rear as it is, and the driver of the following vehicle. The display can be visually confirmed. Further, since the reflecting member attached to the rear window glass 1 is a half mirror, the rear view of the driver is not hindered.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a rear display device for an automobile showing an embodiment of the present invention.

FIG. 2 is a perspective view from the rear of an automobile equipped with the same device.

FIG. 3 is a front view of a display device 3.

FIG. 4 is a graph of the reflectance of the reflection hologram 14.

FIG. 5 is a cross-sectional view when the angle of the rear window glass is changed.

FIG. 6 is a cross-sectional view of another embodiment.

FIG. 7 is an explanatory diagram of a conventional rear display device.

[Explanation of symbols]

1-rear window glass, 2-roof spoiler, 3
-Display, 4-reflective hologram.

Claims (2)

[Claims] 1. A display device installed inside a roof spoiler located at the rear end of the roof and emitting display light downward, and a reflection hologram attached to a rear window glass directly below the display device. And a rear display device for an automobile, which is configured so that display light emitted from the display is applied to the reflection hologram and reflected toward the rear of the automobile to perform rear display. 2. An indicator installed inside a roof spoiler located at the rear end of the roof and emitting display light downward, and a half mirror attached to a rear window glass directly below the indicator. A rear display device for an automobile, comprising: the display light emitted from the display device, which is directed to the half mirror and reflected toward the rear of the automobile for rearward display.