JPH07101266A - Head up display for vehicle - Google Patents

Abstract

PURPOSE:To improve the visibility of a normal display virtual image by forming a dust-proof lens, protecting a normal reflecting lens and a display from dust, into convex shape in a device having the normal reflecting lens for reflecting display light from a display so as to project it as a normal display virtual image. CONSTITUTION:A normal reflecting lens 3 is provided in a case 2a installed at the upper part of an instrument panel 1, and a first dustproof convex lens 4a is provided above the lens 3. A second case 2b is provided in such a way as to surround the periphery of a display 5 installed in a position away from the case 2a, and a mirror 6 is provided inside the case 2b. Display light irradiated from the display 5 is reflected by the mirror 6 and transmitted through a second dust-proof lens 10 so as to reach the first dust-proof convex lens 4a. The display light is divided into the reflected light reflected by the surface of the first dust-proof convex lens 4a, and the transmitted light transmitted through the lens 4a. The transmitted light is reflected by the normal reflecting lens 3 and visually recognized as a reduced virtual image 8b, and the reflected light reflected by the first dust-proof convex lens 4a is visually recognized as an enlarged virtual image 8a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called vehicle head-up display for projecting and displaying information necessary for running a vehicle on a windshield of the vehicle.

[0002]

2. Description of the Related Art Generally, an instrument panel of a vehicle has vehicle information such as a speedometer, a tachometer, a fuel level gauge, a water temperature gauge, etc. to call the driver's attention in order to ensure driving safety. Each instrument is provided. In such a vehicle, it has been proposed to employ a so-called head-up display that optically reflects the display light of the vehicle information and displays it as a virtual image in the front visual field of the driver.
(See, for example, Japanese Patent Laid-Open No. 60-88926) As shown in FIG. 4, in the conventional vehicle head-up display, vehicle information as display light is emitted from the display device 5. After this display light is reflected by the mirror 6,
Passes through the second dustproof lens 10 formed of a transparent material,
It reaches the first dustproof lens 4. The display light that has passed through the first dust-proof lens 4 is reflected by the regular reflection lens 3 and then radiated to the windshield 7 to form a regular display virtual image 8a that is visually recognized by the occupant as vehicle information.

Here, the first dust-proof lens 4 prevents foreign matter from entering the inside of the first case 2a, which is a housing for housing the regular reflection lens 3. In addition, the first dust-proof lens 4 is formed of a transparent material into a concave surface or a flat surface in order to prevent external light from being directly or indirectly reflected in the visual field of a driver or the like, and is provided with an inclination angle. External light is collected by the light-shielding portion and the like. The second dustproof lens 10 is provided in order to prevent foreign matter from entering the second case 2b, which is a storage unit for storing the display unit 5.

[0004]

However, when the display 5 and the like are above the dustproof lens and the light of the display 5 passes through the dustproof lens and is reflected by the regular reflection lens 3, the light of the display 5 is displayed. Is divided into transmitted light that passes through the dustproof lens 4 and reflected light that is reflected on the surface of the dustproof lens 4. This transmitted light is the regular display light, and is reflected by the regular reflection lens to form a regular display virtual image. Further, the reflected light becomes a reflected virtual image that adversely affects the visibility of the regular reflected virtual image. Furthermore, when the dustproof lens 4 is a concave surface toward the light source direction of the display light, the reflected virtual image due to the reflected light is enlarged on the concave surface. Therefore, when the viewpoint of the occupant is shifted, the occupant can visually recognize the enlarged reflected virtual image in the vicinity of the normal display virtual image. For this reason,
The visibility of the regular display virtual image 8a from the passenger side was adversely affected.

Further, in the prior art, in order to improve the visibility of the regular display virtual image 8a from the passenger side, the regular display virtual image 8a is displayed.
In the case of enlarging or reducing, is dealt with by a method such as changing the enlargement ratio of the regular reflection lens 3. However, when dealing with the change in the magnifying power of the regular reflection lens 3, there is a problem that the regular display virtual image 8a is distorted. Also,
When another lens is provided in the optical path to enlarge or reduce the normal display virtual image 8a to improve the visibility, there is a problem that it costs.

Therefore, the present invention provides a new effect to the conventional dustproof lens, that is, an effect of reducing the reflection virtual image by the surface of the dustproof lens, an effect of enlarging the normal display virtual image, or an effect of moving the reflection virtual image away from the normal display virtual image. The purpose of this is to improve the visibility of the regular display virtual image, which is the vehicle information, from the occupant.

[0007]

In order to achieve the above-mentioned object, a vehicle head-up display according to a first aspect of the present invention provides a display for emitting display light and a normal display for the display light from the display. In a vehicle head-up display having a regular reflection lens that reflects to project as a virtual image, a first dustproof lens that closes a storage unit that stores the regular reflection lens to protect the regular reflection lens from dust, and A second dustproof lens that closes a housing for housing the display to protect the display from dust is provided, and at least one of the first and second dustproof lenses is formed in a convex shape.

A vehicle head-up display according to a second aspect of the present invention includes a display that emits display light, and a regular reflection lens that reflects the display light from the display to project it as a regular display virtual image. In a vehicle head-up display having, a first dustproof lens that closes a housing portion that houses the regular reflection lens to protect the regular reflection lens from dust is provided, and an installation position angle of the first dustproof lens is changed. Have the means to do.

[0009]

According to the invention described in claim 1, at least one of the first dustproof lens and the second dustproof lens is formed in a convex shape. When the first dustproof lens is formed in a convex shape, the reflected virtual image reflected on the surface of the first dustproof lens is reduced. When the second dustproof lens is formed in a convex shape, the display light from the display is magnified by the second dustproof lens, whereby the regular display virtual image is magnified. When both the first and second dustproof lenses have a convex shape, the second dustproof lens magnifies the display light to magnify the normal display virtual image, and further the convexity of the first dustproof lens. The reflected virtual image reflected by the shaped surface is reduced.

According to the second aspect of the present invention, the reflection virtual image can be moved away from the normal display virtual image by providing the means for changing the set position angle of the first dustproof lens.

[0011]

EXAMPLES The present invention will be described below with reference to examples shown in the drawings. The configuration of the first embodiment will be described with reference to FIG. A case 2a is provided on the upper portion or inside of the instrument panel 1.
Is installed. A regular reflection lens 3 is provided inside the case 2a, and a first dust-proof convex lens 4a is provided above the regular reflection lens 3 in order to prevent dust from entering and to focus external light. ing. In addition, in order to prevent external light from being directly or indirectly reflected in the visual field of the occupant, the case 2a is provided with a light-shielding portion 9 which reflects the external light focused by the dust-proof lens 4a. There is.

A display device 5 is installed at a position away from the first case 2a. A second case 2b is provided so as to surround the outer circumference of the display unit 5. A mirror 6 is provided inside the second case 2b. The display light emitted from the display 5 is reflected by the mirror 6, passes through the second dustproof lens 10, and reaches the first dustproof convex lens 4a. The display light is divided into reflected light that is reflected on the surface of the first dustproof convex lens 4a and transmitted light that is transmitted. The transmitted light is a regular reflection lens 3 located below the first dust-proof convex lens 4a.
Is reflected at. The reflected light reflected by the regular reflection lens is applied to the windshield 7. The regular reflection lens 3 is a concave lens. On the other hand, the reflected light is reflected by the first dustproof lens 4a, and is irradiated on the windshield 7 at a position slightly displaced from the position irradiated by the transmitted light. Therefore, when the display image emitted from the display device 5 is visually recognized from the passenger side, the reflection virtual image 8b can be seen at a position slightly apart from the normal display virtual image 8a.

The operation of the first embodiment will be described in detail below. While keeping the conventional effect, the dust-proof lens that collects the external light in order to prevent the invasion of dust, etc., and to prevent the external light from being directly or indirectly reflected in the visual field of the occupant The first dustproof convex lens 4a is formed in a convex shape. As a result, the reflected virtual image 8b due to the reflected light reflected by the surface of the first dustproof convex lens 4a is reduced. Further, when the transmitted light is reflected by the regular reflection lens 3, the transmitted light is enlarged because the regular reflection lens 3 is a concave mirror. Therefore, when viewed from the passenger side, the regular reflection virtual image 8a appears enlarged.

As described above, when the regular display virtual image 8a, which is the vehicle information that calls the driver's attention in order to ensure traveling safety, is viewed from the occupant side, the reflection virtual image 8b is reduced, so that the occupant can visually recognize it. The possibility of adversely affecting sex is reduced. At the same time, since the regular display image 8a is enlarged,
The visibility of the regular display image 8a of the occupant is improved. Next, a second embodiment will be described.

As shown in FIG. 2, the difference from the first embodiment is that the second dust-proof lens 10 formed in a plane shape in the first embodiment is formed into a convex second dust-proof convex lens. 1
0a is used. Second dustproof convex lens 10
“A” not only has a dustproof effect of preventing the invasion of dust, but also makes it possible to magnify the display light emitted from the display unit 5. As a result, the second dust-proof convex lens 10
The normal display virtual image 8a by the display light enlarged by a appears to be further enlarged. Further, similarly to the first embodiment, the reflected light reflected on the surface of the dustproof convex lens 4a is reduced. Therefore, the reflection virtual image 8b viewed from the passenger side appears to be reduced.

By providing the second dust-proof convex lens 10a with the effect of enlarging the display in addition to the conventional dust-proof effect,
It is possible to further improve the visibility of the regular display virtual image 8a, which is vehicle information from the occupant side. Next, a third embodiment will be described. As shown in FIG. 3, in order to protect the regular reflection lens 3 from dust, a first dust-proof lens 4 is formed to close the housing for storing the regular reflection lens. An arbitrary point on the side surface of the first dustproof lens 4 is set as a fulcrum 12, and the first dustproof lens 4 is set to be movable around the fulcrum 12. Knob 1 connected to fulcrum 12
By manually operating 1, the position angle of the first dust-proof convex lens 4 can be changed according to the viewpoint of the occupant, and the reflected light reflected on the surface of the first dust-proof convex lens 4 is in a direction away from the regular display light. Reflected in. As a result, it is possible to project the reflection virtual image 8b at a position 8ba farther from the normal display virtual image 8a according to the viewpoint of each occupant. As described above, when the regular display image 8a is viewed from the occupant side, flicker and the like due to the reflected virtual image 8b can be suppressed, and the visibility can be improved.

The present invention is not limited to the above embodiment, but can be variously modified as follows. For example, in the second embodiment, instead of using the first dustproof convex lens installed above the regular display lens 3, a dustproof convex lens which is a conventional technique may be used. That is, even if the second dust-proof convex lens 10a is used alone, the visibility of the regular display image 8a from the occupant side can be improved. Further, in the third embodiment, the installation position angle may be changed by driving the motor instead of the manual operation by the knob 11 as a means for changing the set position angle of the first dustproof convex lens 4.

[0018]

As described above, according to the first aspect of the present invention, by making at least one of the first dust-proof lens and the second dust-proof lens convex, the first dust-proof lens is made convex. When formed, the reflected virtual image is reduced, and in order to ensure the traveling safety of the vehicle, there is an effect of improving the visibility of the regular reflected virtual image as vehicle information so as to call attention to the driving vehicle. When the second dustproof lens is formed in a convex shape, the normal display virtual image is enlarged and the visibility is improved. When both the first and second dustproof lenses have a convex shape, the display light is enlarged by the second dustproof lens, so that the normal display virtual image is enlarged.
Further, the reflection virtual image reflected by the convex surface of the first dustproof lens is reduced, and the visibility of the normal display virtual image is further improved.

According to the second aspect of the present invention, by providing the means for changing the set position angle of the first dustproof lens, it is possible to keep the reflected virtual image away from the normal display virtual image, and in the vicinity of the normal display virtual image. It is possible to suppress flicker and the like due to the reflected virtual image, and improve the visibility of the regular display virtual image.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing an example of a conventional vehicle head-up display.

[Explanation of symbols]

 3 Regular reflection lens 4 First dustproof lens 5 Indicator 10 Second dustproof lens

Claims (2)

[Claims] 1. A vehicle head-up display having a display device that emits display light and a regular reflection lens that reflects the display light from the display device as a regular display virtual image, wherein the regular reflection lens is provided. A first dust-proof lens that closes the storage unit that stores the regular reflection lens to protect the display from dust, and a second dust-proof lens that closes the storage unit that stores the display unit to protect the display unit from dust. A vehicle head-up display, comprising at least one of the first and second dustproof lenses formed in a convex shape. 2. A vehicle head-up display having a display device that emits display light and a regular reflection lens that reflects the display light from the display device as a regular display virtual image, wherein the regular reflection lens is provided. A head-up for a vehicle, comprising: a first dust-proof lens that closes a housing portion that houses the regular reflection lens for dust-proof protection, and means for changing an installation position angle of the first dust-proof lens. display.