JPS6223016A - Head-up display - Google Patents

Abstract

PURPOSE:To prevent a pilot from feeling a shift in the position of an image and variation in the size of the image by arraying two half-mirrors in front of the pilot so that two virtual images are coincident in a relative position relation. CONSTITUTION:Various displays 1 of the flying direction, etc., of an aircraft are produced on a CRT, etc.; and virtual images 9 and 12 are formed on a screen 8 at a finite-distance point through half-mirrors 5 and 11 which slant at a specific angle relatively and the video of an external field is projected from the reverse surface of the screen 8. The two images are coincident in center even when the pilot sees the virtual image 9 of the displays 1 with the eye at a position 7 and sees the virtual image 12 with the eye slightly above. Those tow mirrors are used, so the visual field is expanded and there is variation in neither the display position nor size even when the position of the eye is changed; and the pilot feels no fatigue in the eye even when the display is applied to a dome type simulator.

Description

[Detailed Description of the Invention] The present invention relates to a head-up display, and particularly to a head-up display used in a device in which an operator operates while looking at a finite far point, such as a dome-shaped simulator. Regarding display.

Conventionally, in the head-up display implemented on aircraft, etc., a collimated image, that is, a virtual image formed at the point at infinity, is configured to overlap with the external scenery, which is considered to be at the point at infinity. be.

Furthermore, in the above-mentioned head amplifier display, in order to expand the operator's field of view, a plurality of half mirrors are used. A half mirror farther from the screen (hereinafter referred to as a second half mirror) is arranged in parallel.

However, if an attempt is made to directly apply the head-up display mounted on an aircraft as described above to a dome-shaped simulator or the like that displays an image at a finite far point, the following problems will arise.

Figure 3 shows a head-up display with multiple half-mirrors arranged in parallel, that is, a head-up display mounted on an aircraft, applied as is to a dome-shaped simulator. It is a diagram.

Various displays 1 appearing on a CRT or the like are imaged at an infinity point in front via a lens 2, a turning mirror 3, a lens 4, and a plurality of half' mirrors 5 and 6 arranged in parallel. In this case, a desired image, for example, an image of the outside world (scenery, etc.) is projected on the screen 8 disposed at a finite far point.

Therefore, in the display 1, the image 9 formed by the first half mirror and the image 10 formed by the second half mirror are relatively misaligned (the image 10 is slightly above the image 9), and the result is As a result, when the pilot moves his eyes, the position of the image appears to be different relative to the image in the outside world.

Therefore, the operator cannot avoid delay in motion reaction and eye fatigue.

The present invention was devised in view of the above-mentioned circumstances, and the virtual image remains fixed on the screen even if the operator changes the position of his or her eyes. The aim is to provide an unchanging head-up display.

. In the first aspect of the invention, a plurality of half mirrors are provided in front of the driver, and the first half mirror is tilted at a predetermined angle with respect to the second half mirror. Further, in the second invention, a plurality of half mirrors are provided in front of the driver, and the first half mirror is configured to have a curved surface.

Placement In the first invention, the centers of the two images coincide.

In the second invention, the centers of the two images and their peripheries coincide.

1 Lid Group In FIG. 1, l represents various marks and displays displayed by a CRT or the like. In an aircraft simulator, this mark or display is, for example, a display representing the aiming point with respect to the reference axis of the aircraft, the traveling direction of the aircraft, or the attitude angle.

Here, there is a turning mirror 3 between the lens 2 and the lens 4, and a first half mirror 11 is provided above the lens 2.
There is a second half mirror 5 tilted downward at a predetermined angle with respect to this, and these constitute an optical system that forms a virtual image on the screen 8.

In a head-up display equipped with such an optical system, the display 1 includes a lens 2 and a turning mirror 3.
After passing through lens 4, it reaches half mirrors 5 and 11 installed in front of the pilot, and displays the virtual images 9 and 12 on screen 8 located at a finite far point, and a part of it is a half mirror. - is reflected backwards and returns to the operator's side.

A desired image, for example, an image of the outside world (scenery, etc.) is projected from the back side of the screen 8.

In this case, when the pilot places his eyes at position 7, display 1 appears as virtual image 9, and when the pilot places his eyes slightly above position 7, display 1 appears slightly below virtual image 9. It appears as a tilted virtual image 12.

That is, in this case, unlike FIG. 3, the two images coincide at their centers. However, in this case, a slight positional shift occurs as the image approaches the periphery of the image.

What is shown in FIG. 2 shows a head-up display that is a further improvement of the first invention.

In FIG. 2, reference numeral 1 indicates various marks and displays displayed by a CRT or the like.

Here, there is a turning mirror 3 between the lenses 2 and 4, and above the lens 2, it is convex forward.

There is a first half mirror 13 curved so that
It constitutes an optical system that forms a virtual image.

In a head-up display equipped with such an optical system, the display 1 includes a lens 2 and a turning mirror 3.
The image reaches the half mirror 5 and the curved half mirror 13 installed in front of the pilot through the lens 4, and displays the virtual images 9 and 14 on the screen 8 located at a finite far point. A portion is reflected backward by the half mirror and returns to the driver's side.

A desired image, for example, an image of the outside world (scenery, etc.) is projected on this screen 8.

In this case, the virtual images 14 and 9 are completely aligned not only at their centers but also at their peripheries, and there is no positional shift between them. In other words, the two virtual images completely match in size and position. Note that the screen, that is, the image plane may be a fictitious image plane.

Further, since both images are formed at a finite far point, when the operator tries to view both images alternately, he can easily recognize them without adjusting the focal length of his eyes.

Note that the head-up display according to the present invention can also be applied to a simulator for driving practice. Furthermore, the present invention can be applied not only to simulators but also to head-up displays in automobiles.

As already mentioned, when the head-up display of the present invention is used in a device such as a dome-type simulator that is operated while looking at a finite far point, since it uses multiple half mirrors, The operator's field of view is expanded, and even if the operator changes the position of his eyes, the position or size of the display will not change and be recognized.

Therefore, when such a head-up display is applied to a dome-type simulator, there is no delay in the operator's reaction action, and the operator does not experience eye fatigue.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a head-up display according to the first invention, and FIG. 2 is an explanatory diagram of the head-up display according to the second invention. FIG. 3 is an explanatory diagram of a head-up display in which a plurality of parallel half mirrors are used to form a display image at an infinite point, when it is directly applied to a dome-shaped simulator. 5... Second half mirror 111, 13... First half mirror 18... Image surface, 9.12.14...
virtual image.

Claims (2)

[Claims] (1) An optical system that forms various displays as virtual images at the position of an image plane that displays images of the outside world, the optical system including a plurality of half mirrors installed in front of the operator, The half mirror on the side closer to the image plane is tilted at a predetermined angle with respect to the half mirror farther from the image plane, so that a virtual image seen through the half mirror on the side closer to the image plane and the half mirror farther from the image plane can be created. A head-up display characterized by being configured so that the relative positional relationship with a transparent virtual image matches. (2) An optical system that forms various displays as virtual images at the position of an image plane that displays images of the outside world, the optical system including a plurality of half mirrors installed in front of the operator, The half mirror on the side closer to the image plane is curved so that the size of the virtual image seen through the half mirror closer to the image plane matches the size of the virtual image seen through the half mirror farther from the image plane. A head-up display featuring the following.