JPH03542A - Display device for car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an automobile display device using a multiplex hologram.

[Prior Art] The present applicant previously proposed in Japanese Patent Application No. 1-76767 a high-mounted stop lamp in which a hologram is provided near the rear glass plate of an automobile, and light from a light source is diffracted backward by the hologram to guide the light. proposed. However, this precedent example uses only one hologram, so
It has been difficult to diffract light in left and right and/or up and down directions.

[Problems to be Solved by the Invention] The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to provide a novel display device for automobiles that has not been known in the past. The purpose is to

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and includes a plurality of holograms in which at least one hologram has a diffraction angle such that light spreads out more than other holograms. The present invention provides an automobile display device comprising a multiplex hologram and a light source that emits light toward the multiplex hologram.

The present invention will be explained in detail below with reference to the drawings.

FIG. L is a plan view showing the structure around a multiplex hologram according to an embodiment of the present invention.

In FIG. 1, 1 is a light source, 2 is a lens, 3 is illumination light after passing through the lens, 4 is a multiplex hologram, and 5 is signal light.

In the case of a red light, a red light emitting diode or the like is normally used as the light source 1. Although a convex lens is normally used as the lens 2, it may also be a lens having a light condensing function like a convex lens, such as a Fresnel lens. In the case of FIG. 1, the multiplex hologram 4 is composed of independent transmission holograms 4a, 4b, and 4c, and the holograms 4a, 4b, and 4c have different diffraction angles. The multiplex hologram can be placed at any angle, perpendicular or oblique, to the illumination light 3 (the illumination light 3 can pass through the multiplex hologram). The multiplex hologram 4 is arranged to suit the purpose.

Further, the multiplex hologram 4 may be provided on the surface of the rear glass plate, or may be provided on a plate-shaped body made of transparent synthetic resin, glass, etc., independent of the rear glass plate. FIG. 2 shows a schematic diagram of the rear part of an automobile in which the high-mount display device of the present invention is mounted on the rear glass plate. 6 is a rear glass plate. FIG. 2(a) is a schematic front view of the rear portion of the automobile, and FIG. 2(b) is a schematic cross-sectional side view of the rear portion of the automobile. FIG. 3 shows some embodiments when the hologram used in the present invention is attached to the rear glass plate.
FIG. 3 is a partial cross-sectional view showing the main parts of the rear glass plate. Figure 3 (
A) shows a hologram used in the present invention sealed in laminated glass. Hologram 1 made of photopolymer
1 is an organic adhesive film layer 7 made of polyvinyl butyral or the like.
．． 7', and glass plates 8 and 8' are arranged on both sides thereof. Figure 3 (
b) utilizes a two-layer glass structure provided with an organic resin film such as urethane resin in order to provide the glass with a safety glass function. The hologram 11 is enclosed by being interposed between a glass plate 8 and a resin film 9 made of urethane resin or the like. FIG. 3(C) shows a structure in which a hologram 11 is simply attached to a plate glass 8.

In this case, it is preferable to protect the hologram surface with a hologram protective film 10 made of plastic or the like as shown in the figure.

As the material for the hologram, dichromate gelatin, photopolymer, etc. can be used. There are two types of holograms: transmission type and reflection type, and either type can be used. If a transmissive type is used, the light source will be installed inside the vehicle, and if a reflective type is used, the light source will be installed outside the vehicle, but in either case it will be visible to the driver of the vehicle behind. For example, if the hologram is almost parallel and diffracted slightly downward, or if the hologram has a lens function and is imaged as a virtual or real image at a specific position so that it can be seen by the driver of the vehicle behind. good. Place it inside the car (places include behind the back seat or on the ceiling).Also, it may be a film that simply has wavelength selectivity, that is, it diffracts light in a specific range of wavelengths and transmits or reflects it. However, it may also be a film that includes a display function.

The reflective surface of the hologram is different from that of glass,
It is also possible to cause non-specular reflection of light, or similarly non-pressure refraction. This is preferable because double images due to parasitic light due to reflection and refraction on the glass surface can be suppressed. Another advantage is that an appropriate position for the light source can be freely selected depending on the type of vehicle and the presence or absence of accessories.

Regarding the configuration of the multiplex hologram according to the present invention, it may be configured from three holograms as shown in FIG. Furthermore, although the structure of the multiplex hologram 4 shown in FIG. At least one of the plurality of holograms constituting the multiplex hologram according to the present invention has a diffraction angle that spreads light more than the other holograms, and each diffraction angle can be adjusted as necessary. This will widen the viewing angle for those behind you.

The display device of the present invention can be used as a stop lamp, a reverse light, a direction indicator, a warning light, etc.

[Function] In FIG. 1, the hologram 4a has a diffraction angle designed to diffract the illumination light 3 in the left horizontal direction behind the car, and the hologram 4b diffracts the illumination light 3 in the straight horizontal direction backwards. The hologram 4C has a diffraction angle designed to cause the illumination light 3 to be diffracted horizontally to the rear right of the car, and the hologram 4C is shown in FIG. In this way, the signal light 5 spreads horizontally to the left and right, widening the viewer's viewing angle.

C Effect of the Invention] The multiplex hologram according to the present invention functions to spread the illumination light from the light source.

Therefore, for example, by creating a signal light that spreads horizontally, the viewing angle of the illumination light can be widened, and by creating a signal light that spreads vertically, even if the following vehicle is a short passenger car, it can be seen from a tall vehicle. Even if it is a truck, it is easy to see for the following drivers and contributes greatly to traffic safety.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the structure around a multiplex hologram according to an embodiment of the present invention. Figure 2: Schematic view of the rear of an automobile in which the high-mount display device of the present invention is installed on the rear glass plate ((a) of Figure 2 is a schematic front view of the rear of the automobile;
FIG. 2(b) is a schematic cross-sectional side view of the rear part of the automobile. Partial sectional view. 1: Light source 2: Lens 3: Illumination light 4: Multiplex hologram 6: Rear glass plate 1 Figure 2 View 1 (L) (b)

Claims (1)

[Claims] (1) An automobile display device comprising a multiplex hologram consisting of a plurality of holograms in which at least one hologram has a diffraction angle such that light spreads out more than other holograms, and a light source that emits light toward the multiplex hologram. .