JP2000066132A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device that the visibility of a floating display picture is enhanced and whose constitution is made compact. SOLUTION: This display device is constituted so that a pair of front and back parabolic mirrors 21 and 23 are arranged so that the mutual optical axes thereof are aligned and the focus position of the front-side mirror 21 and an intersection point between the optical axis of the rear-side mirror 23 are substantially aligned. When display light 33 emitted from an automatic light emission type display unit 31 arranged near the focus position of the mirror 21 is reflected between both mirrors 21 and 23, transmitted through a light transmission part arranged near the intersection point between the optical axis of the mirror 21 and condensed at an image forming position set at the front surface side of the mirror 21, the display picture 41 of the display device 31 is made to float and displayed so as to be viewed as the floating picture. Then the focal distance F2 of the rear-side mirror 23 is set to be larger as much as prescribed projecting height H than the focal distance F1 of the front-side mirror 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a pair of parabolic mirrors arranged opposite to each other to float an image of an object set in its internal space from the internal space through a light transmitting portion. The present invention relates to a display device for displaying a display.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing the structure of a conventional display device. As shown in FIG. 5, this display device has a pair of front and rear bowl-shaped first and second parabolas arranged to face each other with their mirror surfaces facing up and down so that their optical axes coincide with each other. It is provided with surface mirrors 1 and 3. The first and second parabolic mirrors 1 and 3 have the same focal length, and the two parabolic mirrors 1 and 3 have their focal positions facing each other. Each parabolic mirror 1,
3 is arranged so as to coincide with a position intersecting the optical axis.

Further, a light transmitting portion 1a is provided at a portion where the first parabolic mirror 1 on the front side intersects with the optical axis, and an inner space (inside region)
In the central part on the mirror surface of the second parabolic mirror 3 in 5,
A predetermined object 7 is arranged.

Accordingly, light 9a from the object 7 is
The light is reflected between the two parabolic mirrors 1 and 3 and condensed at an image forming position near the front side of the first parabolic mirror 1 via the light transmitting portion 1a, thereby forming an image 11 of the object 7. Are displayed in a floating manner at the image forming position so as to be viewed from the inside of the internal space 5.

[0005]

However, the above-mentioned conventional display device has the following disadvantages in that the visibility of the floating display image 11 is low and the device configuration is large in the following points.

That is, in the conventional display device, due to its configuration, the image 11 to be displayed in a floating state is displayed on the first parabolic mirror 1 on the front side.
Can be displayed only in the vicinity of the front side, and cannot be displayed in a floating manner with a larger protruding height, so that the visibility of the display image 11 is low.

Further, in the conventional display device, the light transmitting portion 1a for performing the floating display is open, so that when the image 11 is displayed, the inside of the internal space 5 is transmitted through the light transmitting portion 1a. The configuration is directly viewed, which is a factor of reducing the visibility of the image 11.

Furthermore, in the conventional display device, the internal space 5
Even if an attempt is made to place a large-sized object 7 at the focal position of the first parabolic mirror 1 in FIG.
Since the object 7 protrudes from the second parabolic mirror 3, only the object 7 having a small size can be installed for the entire size of the display device.
1 is obtained and the visibility is poor.

Further, in the conventional display device, when an object 7 having a large size is to be arranged, it is necessary to increase the size of the entire display device to a size slightly larger as shown by a chain line in FIG. Therefore, the conventional display device has a problem that the device configuration becomes large.

In view of the above problems, the first aspect of the present invention
It is an object of the present invention to provide a display device capable of improving the visibility of a floating display image.

A second object of the present invention is to provide a display device capable of reducing the size of the device configuration.

[0012]

The technical means for achieving the above object is a front parabolic mirror of a pair of front and rear parabolic mirrors arranged with their mirror surfaces facing each other. The light from the object disposed near the focal position of the first focal position is reflected between the two parabolic mirrors to form an image of the parabolic mirror on the rear side near the second focal position. A display device that displays the image of the target object at the image forming position by condensing light at a position, wherein the focal length of the parabolic mirror on the rear side is the focal point of the parabolic mirror on the front side. The distance is set to be larger than the distance.

[0013] The technical means for achieving the above object is a first parabolic mirror on the front side of a pair of front and rear parabolic mirrors arranged with their mirror surfaces facing each other. An object is disposed near the focal position, and light from the object is reflected between the two parabolic mirrors, passes through a predetermined light transmitting portion, and passes through a second focal point of the parabolic mirror on the rear side. A display device that displays an image of the object at the image forming position by condensing the light at the image forming position near the position, wherein the light that travels toward the image forming position via the light transmitting unit is formed by the light. While the translucent plate is provided so as to block on the back side of the image position, the object is a self-luminous display unit that emits display light constituting a predetermined display image by itself, or the object is An illumination means for illuminating is provided inside the two parabolic mirrors.

Further, the technical means for achieving the above object is a first parabolic mirror on the front side of a pair of front and rear parabolic mirrors arranged with their mirror surfaces facing each other. Light from an object placed near the focal position is reflected between the two parabolic mirrors and condensed at an imaging position near the second focal position of the parabolic mirror on the back side. A display device for displaying an image of the object at the image forming position, wherein a predetermined centered on an intersection point of the parabolic mirror on the back side with the optical axis of the parabolic mirror on the front side. An area is cut out, and the object can be arranged so as to protrude rearward beyond the mirror surface of the parabolic mirror on the rear side.

Preferably, the two parabolic mirrors have a substantially bowl-shaped mirror surface or a substantially fan-shaped mirror surface obtained by dividing the substantially bowl-shaped mirror surface in a circumferential direction. It is good to be constituted by the mirror body which has.

Further, preferably, the both parabolic mirrors include:
It is preferable to use a disc-shaped Fresnel reflecting mirror or a Fresnel parabolic mirror having a substantially fan-shaped shape obtained by dividing the disc-shaped Fresnel parabolic mirror in the circumferential direction.

The parabolic mirror in the present invention has the purpose of reflecting a light beam and condensing it at a focal point, and includes various curves having substantially the same effect.

For example, in an apparatus that limits the field of view and uses only the vicinity of the center of the optical axis, it is possible to approximately apply a spherical surface instead of a parabolic surface. Even when the shape is changed, it is possible to obtain substantially the same effect as that of a parabolic mirror.

[0019]

FIG. 1 is a perspective view of a display device according to an embodiment of the present invention, FIG. 2 is a sectional view of the display device, and FIG. 3 is a view for explaining the principle of the display device. FIG. 4 is a diagram showing a state in which the display device is applied as a display device for a vehicle.

This display device comprises a pair of front and rear first and second parabolic mirrors 21 arranged so that their mirror surfaces face each other up and down (or back and forth) so that their optical axes coincide with each other. , 23, light-shielding left and right side plates 25 and 27, a translucent translucent plate 29 colored in a predetermined color, and a self-luminous display (self-luminous display ) 3
1a, 31b, and 31c (generally referred to simply as 31).

Each of the parabolic mirrors 21 and 23 has a substantially fan-shaped mirror body whose mirror surface is obtained by dividing a substantially bowl-shaped mirror body in the circumferential direction, in which the vicinity of the optical axis is cut away. They are arranged to face each other such that their outer peripheral edges come into contact with each other and their optical axes coincide with each other.

By cutting off the periphery of the optical axis of the first parabolic mirror 21 on the front side in this way, the display lights 33a to 33c from the display 31 (in the collective case, simply 33
(Not shown) for emitting light from the interior space 35 to the outside.

The periphery of the optical axis of the second parabolic mirror 23 on the back side is cut off to form a display target arrangement area 37 in which the display 31 is arranged. The notched portion around the optical axis of the second parabolic mirror 23 is projected from the inner peripheral end of the parabolic mirror 23 so as to surround the display target arrangement area 37. A light-shielding cover member 39 swelling to the rear side of the mirror surface of the object mirror 23 is provided.

The two side plates 25 and 27 are installed so as to close the left and right openings of the two parabolic mirrors 21 and 23 arranged as described above. The translucent plate 29 closes the opening on the inner peripheral side of the first parabolic mirror 21 and the cover member 39 connected to the inner peripheral side of the second parabolic mirror 23 (ie, The first parabolic mirror 21 is installed so as to block light emitted from the interior space 35 through a light transmitting portion formed by cutting out the periphery of the optical axis of the first parabolic mirror 21). At this time, the translucent plate 2
Reference numeral 9 denotes the position of the display 3 on the display 3 relative to the image formation position of the display images 41a to 41c (generally referred to simply as 41) on the display 31.
It is located on one side.

The internal space 3 in which the display 31 is arranged
5 is completely closed by both parabolic mirrors 21 and 23, both side plates 25 and 27, a translucent plate 29 and a cover member 39, and light from the outside is transmitted only through the translucent plate 29 into the internal space. 39.

The focal lengths F1, F2 of the parabolic mirrors 21, 23 are set as follows (see FIG. 3). That is, the focal length F1 of the first parabolic mirror 21
Means that the focal position of the parabolic mirror 21 is the second parabolic mirror 2
3 is set near the intersection of the optical axis with the mirror surface (actually, the extension surface of the mirror surface). The focal length F2 of the second parabolic mirror 23 is set to be larger than the focal length F1 of the first parabolic mirror 21 by the protrusion height H.

Each display 31 may be a self-luminous display which emits display light 33 constituting a predetermined display image by itself, and includes a liquid crystal display, an EL display and a fluorescent display tube. A simple display device configured by disposing a transmission filter that forms a predetermined display pattern by partially transmitting light on the front side of a light source such as a light bulb or a light bulb can be used. is there.

Such a display 31 is arranged in a display target arrangement area 37 located near the focal position of the first parabolic mirror 21.

As a result, when display is performed by each of the displays 31, the display light 33 from the display surface of each of the displays 31 arranged near the focal point of the first parabolic mirror 21 is shown in FIG.
As shown in FIG. 3 and FIG. 3, the light is first reflected by the first parabolic mirror 21 and subsequently reflected by the second parabolic mirror 23, and is transmitted through the translucent plate 29 to the second parabolic mirror. By condensing the light on the image forming position which is the focus position of 23, the image 41 of the display image displayed on the display surface of each display 31 is floated from the internal space 5 to the image forming position. It is supposed to be.

At this time, the focal length F2 of the second parabolic mirror 23 is set to be larger than the focal length F1 of the first parabolic mirror 21 by the protrusion height H. Therefore, as shown in FIG.
Has a height H protruding forward from the vertex of the first concave mirror 21.
It is designed to be displayed floating only at the position protruding.

Then, the image 41 displayed in a floating state is displayed.
Since the amount of extraneous light incident on the internal space 35 is appropriately suppressed by the translucent plate 29, the light disappears as each display 31 is turned off.

The display device configured as described above is installed at a predetermined position of the instrument panel 51 of the vehicle as shown in FIG. 4, and is used for displaying various kinds of visual information to a driver or the like. For example, it is used for a warning display 53, a clock display 55, and a warning display 57 such as a seat belt indicator display for a driver's seat passenger to a driver.

As described above, according to the present embodiment, as described above, the image 41 of the display image of the display device 31 protrudes from the apex of the first concave mirror 21 to the front side by the projection height H. Since the image is displayed in a floating manner at the position, the visibility of the image 41 displayed in a floating manner can be improved.

The second parabolic mirror 23 has a focal length F2.
Since the diameter of the parabolic mirror 23 is small, the thickness of the parabolic mirror 23 on the rear side in the optical axis direction can be reduced, and the size of the device can be reduced accordingly.

Further, the semi-transparent plate 29 is closed by closing the opening on the inner peripheral side of the first parabolic mirror 21 and the cover member 39 connected to the inner peripheral side of the second parabolic mirror 23. Is installed, when the display is being performed by the display 31, the display image of the display 31 is displayed floating on the front side of the translucent plate 29 via the translucent plate 29. Become. As a result, it is possible to prevent the configuration in the internal space 35 from being directly seen in the depth of the image 41 to be displayed in the displayed state, thereby improving the visibility of the image 41 to be displayed in a floating state. be able to.

Further, since the inside and outside of the internal space 35 are appropriately shielded from light by the translucent plate 29, when no display is performed by the display 31, the floating display image 41 disappears.
The floating display image 41 can appear only when the display is being performed, and the display image 41 can be switched on and off with a simple configuration.

Further, by cutting off the periphery of the optical axis of the second parabolic mirror 23 on the back side, a display target arrangement area 37 in which the display 31 is arranged is formed, as shown in FIG. In addition, the indicators 31b and 31c are disposed at positions protruding rearward beyond the mirror surface of the second parabolic mirror 23, and the display images 41b and 41c of the indicators 31b and 31c can be displayed in a floating manner. Therefore, it is possible to dispose the large-sized display 31 that projects beyond the mirror surface of the second parabolic mirror 23 to the rear side. As a result, the display 31 having a large size can be arranged to display the display image 41 having a large size for the entire size of the apparatus configuration.
And the effect that the device configuration can be reduced in size as compared with a conventional display device capable of displaying a display image 41 of a similar size.

In this embodiment, the display device is constituted by using the substantially sector-shaped parabolic mirrors 21 and 23. However, two substantially bowl-shaped mirrors having a mirror surface extending all around the optical axis are used. The display device may be configured using an object mirror. In this case, in the central part located around the optical axis of the parabolic mirror 23 on the back side,
A hole corresponding to the notch of the present embodiment is formed to form the display object placement area 37, and the hole is closed by the cover member 39.

Further, in the present embodiment, the display device is constituted by using the parabolic mirrors 21 and 23 having the mirror surface continuous along the paraboloid of revolution, but the disk-shaped Fresnel reflection having the same optical function is provided. The display device may be configured using a surface mirror, or a Fresnel parabolic mirror having a substantially sector shape obtained by dividing the disk-shaped Fresnel parabolic mirror in the circumferential direction.

Further, in the present embodiment, the self-luminous display 31 is used. Instead of the self-luminous display 31, a non-self-luminous display which does not emit light is provided, and is provided in the internal space 35. The display may be performed by illuminating the display content of the non-self-luminous display device with the illumination light of the given predetermined illumination means, or illuminating a predetermined display object with the illumination light of the illumination means, The image of the display object may be displayed.

In this embodiment, the two parabolic mirrors 21,
Although the optical axes 23 are arranged so as to coincide with each other, the optical axes do not always need to coincide.

[0042]

According to the first, fourth and fifth aspects of the present invention, the focal length of the rear parabolic mirror is set to be larger than the focal length of the front parabolic mirror. Therefore, the second focal position of the rear-side parabolic mirror, which is the imaging position, can be located at a position protruding forward by a predetermined height from the front-side parabolic mirror. Thereby, the image of the target object can be floated and displayed at a position protruding forward from the parabolic mirror on the front side, and the visibility of the displayed image can be improved.

When a mirror-like body having a substantially bowl-shaped mirror surface is used for both parabolic mirrors, the curvature of the parabolic mirror is reduced by the use of a large-distance focal length mirror on the back side. Smaller,
The thickness of the parabolic mirror on the back side in the optical axis direction can be reduced, and the apparatus configuration can be reduced accordingly.

According to the second, fourth and fifth aspects of the present invention, the translucent plate is provided so as to block the light from the object toward the image forming position via the light transmitting portion on the back side of the image forming position. Therefore, when the display is being performed by the self-luminous display means as the object, or when the object is illuminated by the predetermined illumination means, a predetermined display image is transmitted through the translucent plate. It will be displayed on the front side of the translucent plate. As a result, in the state where the display is performed, it is possible to prevent the configuration in the inner region of both parabolic mirrors from being directly seen in the back of the display image, so that the visibility of the display image can be improved. .

Since the inside and outside of the internal area are appropriately shielded from light by the translucent plate, the display image disappears when no display is performed by the self-luminous display means or when the illumination means is turned off. The display image can appear only when the display is being performed, and the display image can be switched on and off with a simple configuration.

According to the third, fourth and fifth aspects of the present invention, the predetermined area centered on the intersection with the optical axis on the front side is cut off in the parabolic mirror on the rear side. A large-sized object that protrudes to the rear side beyond the mirror surface of the parabolic mirror on the side can be arranged and an image of the object can be displayed. A large display image can be displayed, the visibility of the display image can be improved, and the device configuration can be downsized compared to a conventional display device capable of displaying a display image of a similar size. The effect is obtained.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of the display device of FIG.

FIG. 3 is an explanatory diagram for explaining the principle of the display device of FIG. 1;

FIG. 4 is a diagram showing a state in which the display device of FIG. 1 is applied as a display device for a vehicle.

FIG. 5 is a cross-sectional view of a conventional display device.

FIG. 6 is a diagram showing a state when a large display object is to be arranged on a conventional display device.

[Explanation of symbols]

 21 First (front side) parabolic mirror 23 Second (back side) parabolic mirror 29 Translucent plate 31a, 31b, 31c Self-luminous display 35 Internal space 41a, 41b, 41c Image F1 First F2 focal length of the parabolic mirror F2 Focal length of the second parabolic mirror

Claims (5)

[Claims] 1. A first parabolic mirror on the front side of a pair of front and rear parabolic mirrors arranged with their mirror surfaces facing each other.
The light from the object disposed near the focal position of the focal position is reflected between the two parabolic mirrors and is focused on the image forming position near the second focal position of the parabolic mirror on the back side. A display device that displays an image of the object at the image forming position by emitting light, wherein a focal length of the parabolic mirror on the back side is longer than a focal length of the parabolic mirror on the front side. A display device set to be large. 2. A first parabolic mirror on the front side of a pair of front and rear parabolic mirrors arranged with their mirror surfaces facing each other.
An object is arranged near the focal position of the second object, and light from the object is reflected between the two parabolic mirrors, passes through a predetermined light transmitting portion, and the second of the parabolic mirrors on the back side A display device that displays an image of the object at the image forming position by condensing the light at an image forming position near a focal position, wherein the light traveling toward the image forming position via the light transmitting unit is While the translucent plate is provided so as to block on the back side of the imaging position, the object is a self-luminous display unit that emits display light constituting a predetermined display image by itself, or the object is A lighting device for illuminating the inside of the both parabolic mirrors. 3. A first parabolic mirror on the front side of a pair of front and rear parabolic mirrors arranged with their mirror surfaces facing each other.
The light from the object placed near the focal point of the target is reflected between the two parabolic mirrors and condensed at an imaging position near the second focal point of the parabolic mirror on the back side. A display device for displaying an image of the object at the image forming position, wherein a predetermined point of the parabolic mirror on the back side is centered on an intersection with the optical axis of the parabolic mirror on the front side. Cut out the area of
The display device, wherein the object can be arranged in a state of protruding to the rear side beyond the mirror surface of the parabolic mirror on the rear side. 4. The double parabolic mirror, wherein the mirror surface has a substantially bowl-shaped mirror surface, or a mirror surface having a substantially fan-shaped shape such that the mirror surface is obtained by dividing a substantially bowl-shaped mirror surface member in a circumferential direction. The display device according to claim 1, wherein the display device is configured by: 5. The parabolic mirror according to claim 1, wherein the parabolic mirror is a disk-shaped Fresnel reflecting mirror or a Fresnel parabolic having a substantially sector shape obtained by dividing the disk-shaped Fresnel parabolic mirror in a circumferential direction. The display device according to any one of claims 1 to 3, wherein the display device is configured by a surface mirror.