JPH05333287A - Head-up display device - Google Patents

Abstract

PURPOSE:To reduce the fluctuation of the visual point of an observer and to adjust the focal distance of a reflected image in spite of being at close range by constituting the device of an inside concave combiner provided at close range of the observer and a directly visible display part. CONSTITUTION:The inside concave combiner 3 is provided at close range of the visibility of the visual point 1 of the observer, and the combiner 3 constitutes a half mirror, so that the scenery 5 as the outer field of a view is transmitted and viewed from the visual point 1. On the other hand, the image 8 from the display unit 7 is partially reflected by the combiner 3 and reaches the visual point 1. Then the focal distance of the image 8 is extended by the inside concave surface 9 of the combiner 3, so that focusing by the visual point 1 is reduced in comparison with the case that the combiner 3 is a flat surface. Thus a device for the focusing is not needed between the display unit 7 and the combiner 3 even in the case that the scenery 5 and the image 8 are viewed at the same time from the visual point 1. Consequently the image 8 from the display device unit 7 transmitted through the combiner 3 is confirmed from an outside visual point 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head-up display, and more particularly to a head-up display provided with a combiner in a close range to an observer.

[0002]

2. Description of the Related Art Conventionally, a combiner that transmits an external scene and reflects an optical image from a display is used to spatially superimpose display information and image information such as a natural scenery of the outside in the same visual field. A device is provided for observing. These are generally called head-up display devices, and when used for moving objects such as vehicles and aircraft, various information can be obtained while continuing to see the forward field of view, so the outside world can always be visually recognized. , It is effective in grasping rapid changes in the situation, and is widely used in various fields.

By the way, in the conventional head-up display device, since the focal length of the reflected image from the display is different from that of the outside scene, an optical system for extending the focal length of the reflected image is used. An example of this is shown in FIG. 6, and the image 101 from the display 100 is the folding prism 1.
02, the light passes through the relay lens group 103 for reducing chromatic aberration, is reflected by the combiner 104, and reaches the viewpoint 105.

[0004]

Since the conventional head-up display has the above-mentioned structure, the structure is extremely complicated and naturally expensive. In addition, the weight increases due to the lens and the like, which causes a problem that the space for the focus adjusting mechanism is occupied. These problems are exacerbated when the combiner is in close range. Therefore, it is difficult to obtain a head-up display that uses the windshield surface of the windshield helmet as a combiner. However, no effective means is provided.

On the other hand, in a head-up display in which the combiner is in a close range to the observer, only the observer can see the reflected image due to lack of physical space on the observer side and complicated optical system. Limited Therefore, the reflected image cannot be confirmed by a third party (adjuster, etc.), and it is necessary to ask the observer to imagine the state of the image or imagine the third person himself or herself. If this is a helmet-type head-up display, it takes time to remove the helmet and put it on again. However, a close-up head-up display that allows a third party to easily observe the appearance of the reflected image has not been provided.

In view of the above problems, it is a first object of the present invention to obtain a head-up display having a simple structure and capable of effectively adjusting the focal length of a reflected image even when the combiner is at a close range. The second object is to obtain a close-up head-up display that allows a third party to easily confirm the display contents on the display.

[0007]

In order to achieve the above object, the head-up display device according to the present invention employs the following means. That is, it has a combiner that is provided in the visibility of the observer, transmits the external field of view, and reflects the display information from the display unit to show the external field of view to the observer and the display information in the same field of view. In the head-up display, the optical system can be configured only by the inner concave surface combiner provided at a close distance to the observer and the directly visible display section. In claim 2, the combiner has a radius of curvature of 100 mm to 1
A half mirror having a spherical surface of 50 mm was used.

If necessary, the optical system can be constituted only by the inner concave surface combiner provided in the close range of the observer and the directly visible display section.
A half mirror having a spherical surface with a radius of curvature of 80 mm to 120 mm may be used.

The term "directly visible" means that the image displayed on the display can be visually recognized, and it is visible without requiring a projection film, a lens or the like. A half mirror is a reflection function (a mirror function) and a translucent function (a transparent body function).
It is a thin-faced body that has both, and the ratio of reflection and transmission is 5
It is an arbitrary value including 0:50, and may be 10:90, for example.

[0010]

With the above construction, the image (display information) from the display has its focus extended when reflected by the inner concave surface of the combiner, and is recognized by the observer as a virtual image appearing at a distance. .. This brings the focus closer to the external field of view. Further, the image from the display part is partially transmitted (passed) through the combiner and is observed from the non-observer side.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the head-up display device according to the present invention will be described with reference to the drawings. FIG. 1 is an outline of the configuration, and a combiner 3 is provided at a close range to the visibility of the viewpoint 1 of the observer. Since this combiner 3 constitutes a half mirror, it is possible to see the scenery 5, which is the external field of vision, from the viewpoint 1 through the same. On the other hand, part of the image 8 from the display 7 is reflected by the combiner 3 and reaches the viewpoint 1. At this time, since the inner concave surface 9 of the combiner 3 extends the focal length of the image 8, the viewpoint 1
The focus adjustment by can be reduced as compared with the case where the combiner 3 is a flat surface. Therefore, from viewpoint 1 to scenery 5
Even when both the image and the image 8 are viewed at the same time (merged image), a device for focus adjustment is not required between the display 7 and the combiner 3.

The display 7 is a small CRT (Cathode Ray Tu).
be), LCD (liquid crystal display), LED (light emitting diode) display, etc. At this time, since a device for focus adjustment is not required between the display 7 and the combiner 3, the external viewpoint 1
From 0, the image 8 from the display 7 that has passed through the combiner 3 can be confirmed. In addition, the mounting position of the display unit 7, the display unit area, the brightness, the interval with the combiner 3, the combiner 3
The position and the like of the reflectance (transmittance) viewpoint 1 may be appropriately selected and determined according to the purpose of use. At this time, by setting the radius of curvature of the inner concave surface 9 to be a spherical surface having a diameter of 80 mm to 150 mm, a suitable head-up display device can be obtained.

2 and 3 illustrate the focus extending action of the inner concave surface 9 in FIG. FIG. 2 shows the case of the conventional example. The combiner 23 is a plane, and the image 8 by the display 7 is displayed.
The focal length of the virtual image 26 is B + C. This is A +
Equal to B, the focal length from the image 25 never grows. Therefore, in order to confirm the virtual image 26 and the scenery 5 in the same field of view, focus adjustment (focus adjustment of eyes) from the viewpoint 1 is necessary, and it is not easy to identify the same.

In FIG. 3, combiner 33 has an inner concave surface 34 (ie, in the case of the present invention). Therefore, the focal length of the virtual image 36 of the image 8 by the display 7 is B + C. This is much longer than A + B. That is, the focal length from the image 8 to the viewpoint 1 is sufficiently extended. Therefore, when confirming the virtual image 36 and the scenery 5 in the same field of view, the focus adjustment by the viewpoint 1 is not necessary, and the same view is facilitated.

4 and 5 show an application example of the head-up display device according to the present invention. In FIG. 4, the head-up display device 40 is used for the simulator device 42, and a simulated image 46 by the projector 44 and a display 48 from the display 47 of the head-up display device 40 are viewed by an observer 49 at the same visibility. It can be seen as a natural image. At this time, the simulator device 42 is used as a body-air battle game machine, and the simulated image 4
By displaying the enemy image and the like on 6 and the sighting device image and the like on the display 48, it is possible to provide a realistic anti-aircraft game machine simply and at low cost.

FIG. 5 shows an example in which the head-up display device 50 is used for the windshield of the windshield helmet 51, and the indicator 52 is incorporated inside the windshield helmet 51. In this case, by using the display control device 53 as a receiver, a wireless head-up display device can be provided, and a video device such as a simulator which has never been available can be provided. It can also be used as a simple display device for VR (virtual reality) experience.
At this time, the image 55 from the display device 52 visually recognized by the observer 54.
Can be confirmed from the external viewpoint 56, so that the observer can easily make adjustments while wearing the windshield helmet 51.

In addition to the above-described embodiments, various modifications can be made according to the purpose and application without departing from the spirit of the present invention.

[0018]

As described above, according to the head-up display device of the present invention, only (1) the inner concave surface combiner provided at a close distance to the observer and the directly visible display portion are provided. Since the optical system can be configured, a complicated optical system for focus adjustment or the like is not required, and thus a simple, lightweight, compact, and inexpensive head-up display device can be obtained. (2) Further, since the combiner can be provided at a close distance to the observer, the observer's viewpoint changes little, and the combiner, the display and the like can be easily installed and adjusted. (3) Since the optical system is not required between the display and the combiner, the contents of the display can be visually recognized from the non-observer side, the observer's field of view can be easily imagined, and adjustments can be made. It has effects such as being easily made.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a head-up display device according to the present invention.

FIG. 2 is an explanatory view showing the visibility by a conventional flat combiner.

FIG. 3 is an explanatory view showing the visibility by the combiner according to the present invention.

FIG. 4 is an explanatory diagram showing an application example of the head-up display device according to the present invention.

FIG. 5 is an explanatory diagram showing another application example of the head-up display device according to the present invention.

FIG. 6 is an explanatory diagram showing a conventional optical system.

[Explanation of symbols]

 1 viewpoint 3 combiner 7 indicator 9 inner concave surface 10 external viewpoint 40 head-up display device 42 simulator device 50 head-up display device 51 windshield helmet

Claims (2)

[Claims] 1. The external field of view and the display information are reflected in the same field of view by allowing the external field of view to be transmitted and the display information from the display unit to be reflected, provided in the visibility of the observer. A head-up display having a combiner, wherein an optical system can be configured only by an inner concave surface combiner provided at a close distance to an observer and the directly visible display section. 2. The head-up display device according to claim 1, wherein the combiner is a half mirror having a spherical surface with a radius of curvature of 80 mm to 150 mm.