JP7171982B2 - head-up display device - Google Patents

Description

The present invention relates to a head-up display device.

2. Description of the Related Art A head-up display device is known that reflects light representing an image on a display on a windshield of a vehicle and displays the image as a virtual image in a space in front of the windshield (for example, Patent Document 1). As a result, the driver can visually recognize an image showing information (speed information, car navigation information, etc.) related to the running of the vehicle superimposed on the scenery in front of the windshield.

In order to reduce the size of such a head-up display device, a configuration is generally adopted in which the light from the display device is reflected by a plurality of mirrors and then reflected by the windshield. In order to eliminate distortion, extremely high precision is required for a plurality of mirrors whose reflecting surfaces are generally curved surfaces.

On the other hand, there is a need to increase the amount of information by displaying a virtual image over a wide range in the vehicle width direction. For this purpose, it is necessary to increase the size of the mirror. However, it is difficult to achieve high reflection curved surface accuracy while increasing the size of the mirror.

JP-A-6-130317

The present invention has been devised under the circumstances described above, and is capable of displaying a virtual image in a wide range in the vehicle width direction in the space in front of the windshield without enlarging the mirror. An object of the present invention is to provide an up-display device.

In order to solve the above problems, the present invention employs the following technical means.

That is, the head-up display device provided by the present invention is a head-up display device that displays the image as a virtual image in the space in front of the windshield by reflecting the light representing the image of the display on the windshield of the vehicle. a first mirror that reflects light from the display device; and a second mirror that reflects light from the first mirror and directs the reflected light toward the windshield; is composed of a plurality of mirror elements divided in the vehicle width direction.

In a preferred embodiment, said second mirror is divided into two mirror elements.

Since the second mirror consists of a plurality of mirror elements divided in the width direction, by adjusting the mode, installation position, and attitude of each mirror element, the light reflected on the windshield travels in a wider range in the vehicle width direction. can be made As a result, the virtual image is displayed in a wide range in the vehicle width direction in the space in front of the windshield.

Since the second mirror is divided into a plurality of mirror elements, each mirror element can be kept small. Therefore, it becomes easy to maintain the reflecting surface of each mirror element with high precision. To widen the display range of a virtual image in the vehicle width direction without causing an increase in cost.

Other features and advantages of the invention will become more apparent from the detailed description that follows with reference to the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows one Embodiment of this invention, (a) is the figure seen planarly, (b) is the figure seen from the left side. It is a principal part enlarged view of Fig.1 (a). It is a principal part enlarged view of FIG.1(b).

Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

The head-up display device A1 is arranged at a vehicle width direction position corresponding to the driver's seat using the internal space of the instrument panel 10 of the vehicle.

The head-up display device A1 includes a display 20 that displays an image, a first mirror 30, and a second mirror 40, and is configured in cooperation with a windshield (front windshield) G.

The display 20 is, for example, a liquid crystal display, and appropriately displays images showing various information related to vehicle travel, such as speed information and car navigation information. In this embodiment, the display surface of the display 20 is arranged so as to face slightly backward and obliquely upward. Since the display device 20 also needs to configure the head-up display device A1 in a limited space within the instrument panel 10, a small display device is preferably adopted.

The first mirror 30 is for reflecting the light from the display 20 toward the second mirror 40 described later, and the second mirror 40 directs the reflected light from the first mirror 30 to the windshield G. It is for reflecting light.

In this embodiment, when viewed from the side, the first mirror 30 reflects the reflected light from the display 20 forward, and the second mirror 40 reflects the reflected light from the first mirror 30 obliquely backward. They are arranged so as to be reflected obliquely upward and rearward toward the lower region of the windshield G extending upward. The windshield G reflects the reflected light from the second mirror 40 toward the eye point E of the driver. The windshield G is normally concavely curved toward the interior, and the second mirror 40 is a concave mirror. As a result, the image displayed on the display 20 is displayed as enlarged virtual images V1 and V2 ahead of the optical path L from the windshield G to the eye point E. FIG.

In the present invention, the second mirror 40 is composed of a plurality of mirror elements 41 and 42 divided in the vehicle width direction, and the first mirror 30 receives light from areas obtained by dividing the screen of the display 20 in the vehicle width direction. The second mirror 40 is configured to be divided and projected onto each mirror element 41 , 42 . In this embodiment, the second mirror 40 is composed of a left mirror element 41 and a right mirror element 42 which are divided in the vehicle width direction. They are formed so as to be bent forward and adjacent to each other.

The degree of bending of the left and right reflecting surface elements 31 and 32 of the first mirror 30, the lateral and longitudinal positions of the left mirror element 41 and the right mirror element 42 constituting the second mirror 40, and the degree of curvature are determined by the window. Depending on the position, inclination, and curvature of the shield G, the left and right virtual images V1 and V2 are adjusted so that they can be visually recognized separately from each other by a predetermined distance. The display 20, the first mirror 30, and the second mirror 40 are housed in a housing body (not shown) that defines their mutual positional relationship to form a unit.

According to the head-up display device A1 configured as described above, the second mirror 40 is composed of a plurality of mirror elements 41 and 42 divided in the width direction. By doing so, the light reflected on the windshield G can travel in a wide range in the vehicle width direction. As a result, the virtual images V1 and V2 visually recognized by the driver can be displayed in the space in front of the windshield G over a wide range in the vehicle width direction.

Also, since the second mirror 40 is divided into a plurality of mirror elements 41 and 42, each mirror element 41 and 42 can be kept small. Therefore, it becomes easy to maintain the reflective surfaces of the mirror elements 41 and 42 with high accuracy, so that the head-up display device A1 can spread the virtual images V1 and V2 over a wide range in the vehicle width direction without increasing the cost. can be displayed.

Of course, the scope of the present invention is not limited to the above-described embodiments, and all design changes within the scope of matters described in each claim are included in the scope of the present invention.

Although the second mirror 40 is divided into two mirror elements 41 and 42 in this embodiment, it may be divided into three or more.

In this embodiment, the first mirror 30 is configured such that the planar left and right reflecting surface elements 31 and 32 are convexly bent and adjacent to each other, but the form of the first mirror 30 is not limited to this. In short, it is sufficient that the light from the left and right regions of the image on the display 20 can be divided and projected onto the divided mirror elements 41 and 42 of the second mirror 40 .

A1 head-up display device G windshield E eye point L optical paths V1, V2 virtual image 10 instrument panel 20 display 30 first mirror 31 reflective surface element (left)
32 Reflective surface element (right)
40 second mirror 41 left mirror element 42 right mirror element

Claims (1)

A head-up display device that displays the image as a virtual image in a space in front of the windshield by reflecting the light representing the image on the display on the windshield of the vehicle,
Having a first mirror that reflects light from the display, and a second mirror that reflects light from the first mirror and directs the reflected light toward the windshield,
The first mirror includes a plurality of reflective surface elements adjacent in the vehicle width direction while convexly bent forward,
The head-up display device, wherein the second mirror is divided in the width direction of the vehicle and comprises a plurality of mirror elements for individually reflecting the reflected light from each reflecting surface element of the first mirror .

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