JPH03257490A - Omnidirectional display device - Google Patents

Abstract

PURPOSE:To display a specific image in all directions by arranging plural rod- shaped or spherical convex lens surfaces cylindrically or conically as a display surface and further arranging a photosensitive surface at the focus of the convex lenses on the internal surface side of the display surface. CONSTITUTION:The photosensitive surface 3 arranged at the focus of the rod- shaped convex lenses 1 constituting the part 5 of the display surface is considered to be extremely small screens which are in same number as the rod-shaped convex lenses 1, and extremely small screens. Therefore, each rod-shaped convex lens 1 displays an image corresponding to the position of a viewer and images appearing through those rod-shaped convex lenses 1 constitute one display image on the whole, so that the specific image can be displayed in all peripheral directions. Further, the focus photosensitive surface 3 is composed of light transmitting and shielding patterns and the display image is embossed with light emitted by a light source 6, so that the visibility can be further improved.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to display, guidance, and advertising devices.

(Prior Art) In a conventional display device, if a wide range of visibility is desired, the display surface must be rotated or a plurality of display surfaces with different directions must be used.

(Problem to be solved by the invention) The above method is
All of them are very easy to manufacture using existing technology, but the display part is not always visible to the viewer, and the drive device increases costs and causes failures.

Considering their effectiveness as advertising devices, both types had few visually appealing elements and could not hope to attract the attention of many people. Under these circumstances, the present invention solves the above problems by displaying an image that is the same or according to the viewer's position no matter when viewed from any direction, and has high visibility. Since it is a visual image that cannot be seen normally, it can be used as a display device that attracts the attention of many people.

(Means for solving the problem) Each part constituting the present invention will be briefly explained based on FIG.

A portion 5 serving as a display surface of the present display device has a cylindrical or truncated conical shape, and is composed of a plurality of rod-shaped convex lenses 1 or spherical convex lenses 2 arranged in an annular manner.

A photosensitive surface 3 is provided at the focal point of the rod-shaped convex lens 1. The photosensitive surface 3 can be considered to be the same number of microscreens as the rod-shaped convex lenses 1 or the spherical convex lenses 2, and one microscreen corresponds to one rod-shaped or spherical convex lens pair.

(Operations and Examples) The basic configuration of this display device is as described above. Next, let us take as an example a case in which the character “shi” can be viewed as the same image from any angle of 360 degrees using this display device. The display principle will be explained below.

The microscreens constituting the photosensitive surface 3 are marked with a vertically stretched "shi" pattern as shown in FIG. 2, and this pattern is exactly the same on all the microscreens. In other words, rod-shaped convex lenses and patterned microscreens are arranged in a ring in exactly the same pattern on the large cylindrical display surface 5.
It consists of Now, when viewing this display device from the viewpoint 4a shown in FIG. 3, the rod-shaped convex lens 1a on the left side of the display device
The image that appears is an enlarged image of the black linear pattern portion on the microscreen corresponding to 10 in FIG.

Therefore, the cylindrical lens 1a is completely black when viewed from the viewpoint 4a. Similarly, display device cylindrical lens 1 near the center
The image appearing in b is an enlarged image of the portion corresponding to the dotted line 11 in FIG. 2, and only the central portion of this portion is black.

On the other hand, from the viewpoint 4b in Fig. 3, the same rod-shaped convex lenses 1a and 1
When looking at b, the displayed images are parts 11 and 12 on the display screen in Fig. 2, respectively, and the rod-shaped convex lens 1a is white except for the black part near the center, and the rod-shaped convex lens 1b is entirely white. .

In this way, each rod-shaped convex lens displays an image according to the position of the viewer, and the images appearing on these rod-shaped convex lenses collectively constitute one display image. The vertical resolution of the displayed image is determined by the number of rod-shaped convex lenses 1, the fineness of the pattern on the photosensitive surface 3, and the optical aberration of the rod-shaped convex lenses 1.

Next, a specific example of this display device will be shown.

FIG. 4 shows various shapes of the display surface. 13 is a truncated cone shape, 14 is a spindle shape, and 15 is an elliptical cylinder shape. Any so-called cylindrical shape other than an equal cylindrical shape can be used as the display surface.

Even if a spherical convex lens 2 is used instead of the rod-shaped convex lens 1, the principle is the same, and it is possible to display an image in the entire circumferential direction, but the image is more visible than when the rod-shaped convex lens 1 is used. There is also the problem that the bottom corner becomes narrower. In order to prevent this problem, as will be described later, it is necessary to perform multiple exposure during the process of forming the focal photosensitive surface 3.

In the above example, the focal photosensitive surface 3 was simply a colored surface, but it may also be a surface composed of a light-transmitting/light-blocking pattern, and furthermore, the light-transmitting portion may have colored light-transmitting properties. It's okay. In this case, the light emitted from the light source shown at 6 in FIG. 1 makes the displayed image stand out, improving visibility.

8 shown in FIGS. 1 and 5 is a semitransparent diffuser that is effective when added when a light source is placed inside the display device,
It has the effect of scattering and transmitting light or coloring it. This semi-transparent diffuser 8 allows light to uniformly exit from the transparent portion of the focal photosensitive surface 3 to the outside, thereby eliminating unevenness in the brightness of the displayed image. A similar effect can be achieved by directly covering the focal photosensitive surface 3 with a translucent diffuser 8, as shown in FIG. It can also be obtained by coating the photosensitive surface with a fluorescent paint or a semi-transparent matte paint after forming the photosensitive surface.

In FIG. 6, approximately half the circumferential surface of the rod-shaped convex lens body 1 is directly at the focal plane 9.
The photosensitive surface 3 can be directly formed on the lens 9. The lens shapes of the rod-shaped convex lens and the spherical convex lens are 16, 17, and 16, as shown in Figure 7.
Various types can be used, such as double row type, 18 continuous cylindrical type, etc.

Reference numeral 19 in FIG. 6 is a cover for preventing diffused reflection and stray light from the rod-shaped convex lens. It is also possible to improve the rigidity of the display surface by closely adhering or integrally fixing the cover unit 19 to the rod-shaped convex lens.

Next, the process of forming the photosensitive surface will be specifically explained.

FIG. 8 is a sectional view of a rod-shaped convex lens portion.

A focal plane 9, which is also the surface of the rod-shaped convex lens, serves as a photosensitive surface 3. This rod-shaped convex lens is assembled into a cylindrical shape and fixed.

Reference numeral 20 in FIG. 8 irradiates the display device with nearly parallel light rays, and reference numeral 21 in FIG. 8 is an original mask placed between this light source and the display device. The pattern on this original image mask 21 is projected onto the large cylindrical body 5 serving as a display surface. The light hitting the rod-shaped convex lens 1 constituting the large cylinder 5 is refracted and formed into an image on the photosensitive surface 3, which becomes the focal point, thereby exposing the photosensitive surface. At this time, a linear region 22 parallel to the rod-shaped convex lens 1 is imaged on the focal photosensitive surface.

Next, with the light source 20 and the original image mask 21 fixed, the display device is rotated about the central axis as a rotating body. Looking at the pair of rod-shaped convex lenses and the focal photosensitive surface, the imaging position 22 moves continuously in response to changes in the incident angle of the light beam, and the focal photosensitive surface is sequentially exposed. The present display device, which has undergone such an exposure operation in which the photosensitive surface is stabilized after completion of exposure, displays the same image as the original image mask 21 in any direction of 360 degrees.

The light source and the original mask may be obtained by a so-called slide device.

In the present display device using a spherical convex lens instead of a rod-shaped convex lens and subjected to the above-described exposure operation, the vertical angle at which the displayed image can be viewed becomes extremely narrow.

To prevent this problem, the display device may be rotated many times during the exposure process, and the tilt in the direction 23 in FIG. 9 may be slowly applied.

The above is an exposure method for displaying the same image in all circumferential directions.For example, if you want the letter A to appear when the display device is viewed from the north and the letter B to appear when the display device is viewed from the south, the exposure method for this display device should be Exposure may be performed using an original mask with A on the north side and B on the south side.

(Effects of the Invention) As explained above, the present invention is capable of displaying a predetermined image in the entire circumference direction, and is used for advertisements, display boards, etc. Figure 1 is a perspective view with the top surface of the display device removed. be. FIG. 2 is a perspective view showing an example of a rod-shaped convex lens and a photosensitive surface. Third
The figure shows the display device and viewpoint viewed from above.
FIG. 4 is a perspective view of an example showing the outer shape of the display surface of the present display device. 5 and 6 are enlarged views of an example of a rod-shaped convex lens, a photosensitive surface, and a scattering and transmitting surface. FIG. 7 is a cross-sectional view of an example of a rod-shaped convex lens and a spherical convex lens.

FIGS. 8 and 9 are perspective views of an example of exposure operations.

1... Rod-shaped convex lens 2... Spherical convex lens 3... Focus photosensitive surface 4... Viewpoint 5... Large cylindrical body serving as display surface 6...
... Light emitting part 7 ... Central axis of rotating body
8... Surface that scatters and transmits light 9... Lens surface portion 10, 11, 12 which is also the focal point of the convex lens
・・・・・・Linear area on photosensitive surface 3 13・14・1
5...Example of external shape of display surface 16, 17, 18,
...Cross-sectional view of convex lens body 19 ... Stray light prevention cover 20 ... Light source 21 ...
... Original image mask 22 ... Linear area to be imaged 23 ... Tilt direction single item lt Wind Cave Jinchu 1
11 Woodcutter l6 r~'V~V-V- Earth 8 body 0 mouth\231 Rim=\1

Claims (4)

[Claims] (1) The lens surfaces of a plurality of rod-shaped convex lenses 1 or spherical convex lenses 2 are arranged so as to form a larger cylindrical shape or a conical shape, and this is used as the display surface 5, and the rod-shaped A display device characterized in that a photosensitive surface 3 is disposed at a position where a lens 1 or a spherical lens 2 is focused. (2) The display device according to claim 1, further comprising a light emitting portion 6 inside the large cylinder 5 or large cone 5 serving as a display surface. (3) Of the lens surfaces of the rod-shaped convex lens 1 or the spherical convex lens 2, the approximately half-circumferential surface 9 that constitutes the inside of the display surface is the focal plane of the rod-shaped convex lens 1 or the spherical convex lens 2, and the lens is brought into close contact with this surface to be exposed to light. The display device according to claim 1, characterized in that a surface 3 is formed. (4) Of the lens surfaces of the rod-shaped convex lens 1 or the spherical convex lens 2, approximately half the circumferential surface 9 that constitutes the inside of the display surface is matte, and this surface 9 is the focal plane of the rod-shaped convex lens 1 or the spherical convex lens 2. 2. The display device according to claim 1, wherein the photosensitive surface 3 is formed in close contact with this surface.