JPH0732912A - Vehicle front end position display device - Google Patents

Abstract

PURPOSE:To provide a vehicle front end position display device with a low cost and a good visibility. CONSTITUTION:An index 13 to indicate the vehicle front end position being lighted by a halogen lamp 8; dichroic mirrors 9 and 10 to divide the luminous flux passing through the index 13 into light fluxes of plural wave lengths in order to form plural virtual images by the index 13; and a combiner to lead the luminous flux reflected by the dichroic mirrors 9 and 10, and to form plural virtual images 15 and 16 at the different distance in front of a windshield; are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a vehicle tip position display device for forming a virtual image of an index for presenting the vehicle tip position at the tip of a vehicle.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Utility Model Laid-Open No. 3-109925, there is known a vehicle tip position display device which forms a virtual image of an index for presenting the vehicle tip position in front of a windshield. ing.

This conventional vehicle front end position display device has three cathode ray tubes and one lens as light emitting sources. The two cathode ray tubes are spaced apart and arranged in front of the lens, and the remaining one cathode ray tube is arranged behind the lens and in the center of the two cathode ray tubes.

In this device, a pair of virtual images formed by two cathode ray tubes and a virtual image formed by the remaining one cathode ray tube are presented at different distances in front of the vehicle, and a pair of virtual images are presented. Virtual images are formed at intervals. The driver visually recognizes the three virtual images from the position of the eye range,
The position of the front end of the vehicle can be confirmed when the virtual image formed by one cathode ray tube is seen in the center of the pair of virtual images, which allows the driver to visually recognize the position of the front end of the vehicle from the eye range position with a stereoscopic effect.

[0005]

However, this conventional vehicle tip position display device requires a number of cathode ray tubes corresponding to the number of virtual images and uses a lens, so that the cost is high. There is a point.

Further, since the light emitting source is a cathode ray tube, there is a problem in that the brightness is not sufficient and the visibility in the daytime is deteriorated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle tip position display device which is inexpensive and has good visibility.

[0008]

In order to solve the above-mentioned problems, a vehicle tip position display device according to the present invention is provided with an index for presenting the vehicle tip position illuminated by a halogen lamp, and a plurality of indicators. To divide the illumination light flux that has passed through the index into light fluxes of a plurality of wavelengths to form a virtual image of the plurality of wavelengths, and the illumination light fluxes wavelength-divided by the wavelength division member are guided to the plurality of virtual images. And a combiner that is formed in front of the windshield at different distances from each other.

[0009]

According to the vehicle tip position display device of the present invention, the indicator for indicating the vehicle tip position is illuminated by the illumination light of the halogen lamp. The illumination light passing through this index is guided to the wavelength division member. The illumination light flux divided into a plurality of wavelengths is guided to a combiner, and the combiner forms a plurality of virtual images at different positions in front of the windshield at different distances.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle tip position display device according to the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is an instrument panel, 2 is a windshield, 3 is a rearview mirror, 4 is a room lamp, and 5 is a combiner.

A display unit 6 for displaying a virtual image is provided near the room mirror 3. The display unit 6 has a halogen lamp 8 and dichroic mirrors 9 and 10 in a cover 7 as shown in FIG. A diffusion plate 11 and a film 12 are provided between the halogen lamp 8 and the dichroic mirror 9. The film 12 is attached to the diffusion plate 11.

The diffusion plate 11 has a function of scattering illumination light. An index 13 is provided on the film 12 as shown in FIG. The halogen lamp 8 is connected to a power source (not shown) by the lead wires 8a and 8a, and the illumination light from the halogen lamp 8 is diffused by the diffusion plate 11 to illuminate the index 13.

The dichroic mirror 9 is red light (R light).
The dichroic mirror 10 functions as a wavelength division member that reflects light and transmits green light (G light) and blue light (B light).
Functions as a wavelength division member that reflects green light and transmits blue light.

Of the illumination light that illuminates the index 13, the light flux of the red component is reflected by the dichroic mirror 9, and the light flux of the green component of the illumination light that has passed through the dichroic mirror 9 is reflected by the dichroic mirror 10.

A plane reflection mirror is provided near the room lamp 4.
14 are provided. The light flux of the red component is reflected by the dichroic mirror 9 and deflected rearward of the vehicle, and the light flux of the green component is reflected by the dichroic mirror 10 and deflected rearward of the vehicle. As shown in FIG. 4, the light is guided to the plane reflection mirror 14 and is deflected by the mirror 14 toward the combiner 5. Here, the reason why the light flux of the red component and the light flux of the green component are once guided to the rear of the vehicle is to make the optical path length as long as possible and form a virtual image at a vehicle front position far from the windshield 2. .

The combiner 5 is composed of a plane mirror made of a semi-transmissive or transparent material, and the combiner 5 allows a plurality of virtual images 15 and 16 based on the light flux of the red component and the light flux of the green component to have different distances from each other. It is formed in front of the glass 2. The driver can see these virtual images 15 and 16 at the position of the eye point E.

The reason why the distances from the combiner 5 to the positions where the virtual images 15 and 16 are formed are different is as follows.

An optical path length L1 from the index 13 of the light flux of the red component to the plane reflection mirror 14 (the optical path length from the plane reflection mirror 14 to the combiner 5 is L3) and an index of the light flux of the green component
This is because the optical path length L2 from 13 to the plane reflecting mirror 14 (the optical path length from the plane reflecting mirror to the combiner 5 is L3) is different by the distance Lg between the dichroic mirrors 9 and 10. That is, in this embodiment, the virtual image 16 is formed in front of the virtual image 15 by the distance Lg. Where the virtual image 15
Is formed by the light flux of the red component, so it exhibits a red color,
The virtual image 16 is green because it is formed by the light flux of the green component.

Therefore, the driver can recognize the position of the front end of the vehicle by the color difference, and the approach of the target object to the obstacle or the like can be determined by the color difference.

As described above, in the embodiment, the display unit 6
The dichroic mirrors 9 and 10 for reflecting the red component and the green component are provided in the above. However, if a dichroic mirror for reflecting the blue component is additionally provided, virtual images of three different colors can be displayed on the windshield. It can be displayed in front of 2 at different distances.

[0022]

Since the vehicle front end position display device according to the present invention is constructed as described above, a plurality of virtual images can be displayed in front of the windshield of a vehicle while providing sufficient brightness with one halogen lamp. It has the effect of being presented. Further, the cost of the vehicle tip position display device can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic view of a vehicle tip position display device according to the present invention.

FIG. 2 is a diagram showing a detailed structure of a display unit used in the vehicle tip position display device according to the present invention.

FIG. 3 is a plan view of the film plate shown in FIG.

FIG. 4 is a schematic diagram for explaining a formation state of a virtual image according to the present invention.

[Explanation of symbols]

 2 ... Windshield 5 ... Combiner 8 ... Halogen lamp 9, 10 ... Dichroic mirror (wavelength division member) 13 ... Index 14 ... Plane reflection mirror

Claims (2)

[Claims] 1. An index for illuminating with a halogen lamp to present a vehicle front end position, and an illumination light flux that has passed through the index to form a plurality of virtual images by the index are divided into light fluxes of a plurality of wavelengths. And a combiner for guiding the respective illumination light beams wavelength-divided by the wavelength dividing member and forming the plurality of virtual images at different distances in front of the windshield. Vehicle tip position display device. 2. The illumination light flux that has passed through the index is guided to the rear of the vehicle by the wavelength division member, and the wavelength division light flux is reflected toward the combiner between the wavelength division member and the combiner. The vehicle tip position display device according to claim 1, wherein a reflection mirror is provided.