JPH11281917A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which can improve an exhibition effect by forming the image of an object to be exhibited in an optimum position on the display device independently of the size of the object. SOLUTION: An exhibiting device 20 consists of a first concave mirror 21 and a second concave mirror 22. A window 21a is opened in the first concave mirror 21, Light emitted from an object 52 placed on the center part of the reflection face of the second concave mirror 22 is reflected by the reflection face of the first reflection mirror 21 and that of the second reflection mirror 22 to form an image S2' in the vicinity of the window 21a. This image S2' is seen by the observer as if it were an object S2 floating on the display device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of placing an exhibit in a space formed by two concave mirrors arranged opposite to each other, and not displaying the exhibit itself. The present invention relates to a display device for displaying an object as if it were floating by an image of the object formed by reflecting light rays emitted from the two concave mirrors.

[0002]

2. Description of the Related Art A conventional display device is disclosed in U.S. Pat. No. 3,647,284. This display device will be described with reference to FIG. As shown in FIG. 3B showing a longitudinal section of the display device 10, the display device 10
Is composed of a first concave mirror 1 and a second concave mirror 2. The first concave mirror 1 and the second concave mirror 2 form a paraboloid obtained by rotating a parabola having an origin and a focus on the axis Ax around the axis Ax. The first concave mirror 1 and the second concave mirror 2 have the same paraboloid,
The concave mirrors are arranged such that the focal points of the other concave mirrors are located at the origin of the parabolic surface of one concave mirror (the point where the paraboloid intersects the axis Ax). The first concave mirror 1 is provided with a window 1a for explaining the appearance of the upper surface of the display device 10, as shown in FIG.

An object S1 as an exhibit is placed or fixed near the center of the reflection surface of the second concave mirror 2 as shown in FIG. Hereinafter, among the light beams emitted from the object S1, the light beams r1 and r2 will be described. Object S1
The light rays r1 and r2 emitted from the surface of are reflected by the first concave mirror 1 and become light rays that travel in parallel to the axis Ax.
The light is reflected by the second concave mirror 2 and converges near the window 1a of the first concave mirror 1. Thus, an image S1 'is formed near the window 1a. Note that this image S1 'is an upright image that is reversed left and right. The observer can observe the image S1 'instead of the object S1 itself by turning his or her gaze in the direction indicated by the arrow E in FIG. 3B. In other words, the observer sees the object S1 as if it were floating near the window 1a.

[0004]

However, when attempting to display objects of various sizes with the above-mentioned display device, if the objects are large, vignetting may occur in the image, and if the objects are small, the image may be displayed. It may sink into the equipment. Hereinafter, the vignetting problem and the sinking problem will be described with reference to FIG.

The vignetting first concave mirror 1 is provided with a window 1a as described above.
That is, the first concave mirror 1 is in a state in which there is no reflecting surface. Therefore, when a relatively large (high) object S2 is placed in the display device 10, light emitted from near the top of the object S2 is not reflected by the first concave mirror and passes through the window 1a. For this reason, the image S2 'formed near the window 1a has an apex missing. On the other hand, as shown in FIG. 3C, by providing a gap δ between the first concave mirror 1 and the second concave mirror 2 according to the height of the object S2, the image S2 ′ is vignetted. Therefore, the observer can observe the entire image S2 ′ of the object S2.

However, when a relatively small (low) object S1 is placed in the display device 10 with a gap δ provided between the first concave mirror 1 and the second concave mirror 2, an image S1 'is formed. Is formed inside the display device 10. That is, the image S
1 'sinks into the display device 10,
The observer cannot observe the image S1 unless the observer looks into the inside of the display device 10 from the window 1a. The fact that the image S1 'cannot be observed unless the observer looks into the inside of the display device 10 in this way not only reduces the display effect by half, but also the object S1 enters the observer's field of view together with the image S1'. The display effect will be further diminished.

SUMMARY OF THE INVENTION The present invention has been made in view of the above background and enhances the display effect by forming an image of an object at an optimum position on a display device regardless of the size of the object to be displayed. It is an object of the present invention to provide a display device capable of performing the following.

FIG. 2 shows an embodiment of the present invention.
The present invention provides a first concave mirror 21
And a second concave mirror 22 disposed opposite to the first concave mirror 21, and light emitted from an object S2 placed near the reflection surface of the second concave mirror 22 is transmitted to the first concave mirror 21 and the second concave mirror 22. 2
S of the object S2 formed by being reflected by the concave mirror 22 of FIG.
In order to observe 2 ′, the present invention is applied to a display device having an optical transmission portion 21a provided on the first concave mirror 21. Then, interval adjusting means 21d, 21e for adjusting the interval between the first concave mirror 21 and the second concave mirror 22;
By having 22d and 22e, the above object is achieved.

[0008] In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments of the present invention are used to make the present invention easier to understand. However, the present invention is not limited to this.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A display device according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1 illustrating the appearance of the display device 20, the display device 20 has a first concave mirror 21 having a window 21a formed at the top and a hill-like shape formed at the bottom such as a bowl at the bottom. And the second concave mirror 22 on which the base 22f is formed. The first concave mirror 21 and the second concave mirror 22 are combined so that their reflecting surfaces face each other. These first concave mirror 21 and second concave mirror 21
The concave mirror 22 is formed of a thermoplastic synthetic resin such as ABS, acrylic (PMMA), or polycarbonate, and a mirror surface is formed on each reflecting surface by aluminum evaporation. In addition, if a protective film is formed on the aluminum vapor-deposited layer as needed, the oxidation of the aluminum film can be prevented, and the mirror surface itself can be protected, and the durability of the first concave mirror 21 and the second concave mirror 22 can be improved. improves.

On the peripheral edge of the first concave mirror 21, three convex portions 21d are provided at an angular interval of 120 °, while the second
The concave mirror 22 is also provided with three convex portions 22d at an angular interval of 120 °. A cylindrical guide 22g is provided on the outer periphery of the second concave mirror 22, and the dimensions are determined so that the inner periphery of the guide 22g and the outer periphery of the convex portion 21d of the first concave mirror 21 fit in a loose fit state. Have been.

The alignment marks 21b and 21c are provided at two places on the upper surface of the first concave mirror 21, and serve as alignment marks when aligning the first concave mirror 21 and the second concave mirror 22. On the other hand, a notch 22b is cut in the guide 22g of the second concave mirror 22, and these matching marks 21b and 21c and the notch 22b are formed.
b serves as a guide when the first concave mirror 21 and the second concave mirror 22 are combined.

The matching marks 21b and 21c and the notch 22b will be described. First concave mirror 21
Mark 21b and notch 22b of second concave mirror 22
By combining the first concave mirror 21 and the second concave mirror 22 so that
d has a staggered positional relationship. That is, the first concave mirror 2
The first convex portion 21d contacts the concave portion 22e of the second concave mirror 22, and the convex portion 22d of the second concave mirror 22 contacts the concave portion 21e of the first concave mirror 21. As a result, the first concave mirror 21 and the second concave mirror 22 are combined in a state where the distance between the respective reflecting surfaces is relatively short. In this state, it is suitable for displaying relatively small objects. Less than,
This state is expressed as a state in which the first concave mirror 21 and the second concave mirror 22 are close to each other.

On the other hand, the first concave mirror 21 and the second concave mirror 22 are relatively rotated to form the matching mark 21c and the notch 22.
When b is combined, the projections 21d and 22b have a positional relationship of facing and abutting. Thereby, the first concave mirror 2
The first and second concave mirrors 22 are in a state where the distance between the respective reflecting surfaces is relatively large. In this state,
Suitable for displaying relatively large objects. Hereinafter, this state is referred to as a state in which the first concave mirror 21 and the second concave mirror 22 are separated.

Here, the operation of the guide 22g will be described. When the combined angular position of the first concave mirror 21 and the second concave mirror 22 is shifted according to the size of the object to be displayed,
Since the outer periphery of the first concave mirror 21 is held by the inner periphery of the guide 22g, the first concave mirror 21 does not slip off from above the second concave mirror 22. Thereby, the usability of the display device 20 is improved, and the display device 2
0 can be prevented.

A method of displaying an exhibit using the display device 20 configured as described above will be described with reference to FIG.

In FIG. 2A, which is a longitudinal sectional view showing a state where a relatively large object S2 is exhibited, the first concave mirror 21 and the second concave mirror 22 are positioned so as to be separated from each other. . That is, the first concave mirror 21 and the second concave mirror 22 are combined in a state where the matching mark 21c and the notch 22b are aligned in FIG. For this reason, the distance between the reflecting surfaces of the first concave mirror 21 and the second concave mirror 22 is determined by the distance between the first concave mirror 21 and the second concave mirror 2.
As compared with the case where the object 2 is approaching, the object S2 is separated by δ, and there is no vignetting at the top of the image S2 ′ of the object S2 and the observation becomes impossible. This gap δ may be determined according to the assumed size of the object S2.

On the other hand, in FIG. 2B, which is a longitudinal sectional view showing a state in which a relatively small object S1 is exhibited, the first concave mirror 21 and the second concave mirror 22 are positioned with respect to each other so as to approach each other. Is done. That is, the first concave mirror 21 and the second concave mirror 22 are combined in a state where the matching mark 21b and the notch 22b are aligned in FIG. Therefore, the image S1 ′ of the object S1 does not sink into the display device 20.

As described above, according to the display device 20 according to the embodiment of the present invention, the first concave mirror 21 and the second concave mirror 22 are set according to the size of the object S1 or S2.
By simply changing the relative position in the rotation direction when combining the images, it is possible to always obtain a good display effect.

In the above description of the embodiment, the projection 21d
And 22d, and the concave portions 21e and 22e are provided to switch the distance between the reflecting surfaces of the first concave mirror 21 and the second concave mirror 22 to two steps of far and near.
The shape of 1d and 22d may be changed to enable switching to three or more stages. Alternatively, a screw may be provided on the outer edge of the first concave mirror 21, and a female screw may be provided on the inner circumference of the guide 22 of the second concave mirror 22 to be screwed with the male screw.
Alternatively, the distance between the reflection surfaces may be continuously changed by relatively rotating the second concave mirror 22. Further, an annular spacer may be interposed between the first concave mirror 21 and the second concave mirror 22 to adjust the distance between the reflection surfaces.

A window 21 formed in the first concave mirror 21
a may be an optical transmission part instead. That is, a continuous concave surface is formed in the first concave mirror 21 without forming the window 21a, the first concave mirror 21 is formed of a transparent material, and only a portion corresponding to the window 21a is subjected to masking when aluminum is vapor-deposited. May be transmitted. By doing so, dust can be suppressed from entering the inside of the display device 20, and the state of the reflection surface can be kept good for a longer period.

The shape of the reflecting surfaces of the first concave mirror 21 and the second concave mirror 22 is not limited to a parabolic surface, but may be another concave shape such as an elliptical surface or a spherical surface as required. .

An object placed inside the display device 20 is normally illuminated by light incident from above the window 21a, but the inside of the display device 20 and the first concave mirror 2 are illuminated.
An illumination device may be installed at a joint or the like between the first and second concave mirrors 22. Alternatively, the first concave mirror 21 is formed of a transparent material, and a daylighting window is formed in an area that is not used for forming an image of an object (such as a peripheral portion of the first concave mirror 21) without performing aluminum deposition. Alternatively, the first concave mirror 21 may be formed of an opaque material, and a hole serving as a lighting window may be formed in a peripheral portion thereof.

In the correspondence between the above-described embodiment and the claims, the window 21a constitutes an optically transmissive portion, and the projections 21d and 22d and the recesses 21e and 22e constitute interval adjusting means, respectively.

[0024]

As described above, according to the display device of the present invention, the distance between the reflecting surfaces can be easily adjusted according to the size of the object to be displayed. An effective display can be performed without causing vignetting or sinking of the image into the display device.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a display device according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining how a relative distance between two concave mirrors is changed according to the size of an object to be displayed, and FIG.
Shows a state where a relatively large object is exhibited, and (b) shows a state where a relatively small object is exhibited.

3A and 3B are diagrams illustrating a display device according to the related art, in which FIG. 3A is a top view, and FIG. 3B is a vertical cross-sectional view illustrating a state where a relatively small object is exhibited. )
FIG. 2 is a longitudinal sectional view showing a state where a relatively large object is exhibited.

[Explanation of symbols]

 Reference Signs List 20 display device 21 first concave mirror 21a window 21b, 21c matching mark 21d convex portion 21e concave portion 22 second concave mirror 22b cutout 22d convex portion 22e concave portion 22g guide 22f pedestal S1, S2 object S1 ', S2' image

Claims (1)

[Claims] 1. A first concave mirror, a second concave mirror disposed to face the first concave mirror, and light emitted from an object placed near a reflection surface of the second concave mirror. A display device having an optical transmission portion provided on the first concave mirror for observing an image of the object formed by being reflected by the first concave mirror and the second concave mirror; A display device, comprising: a distance adjusting means for adjusting a distance between a concave mirror and the second concave mirror.