JP2001290217A - Video system utilizing water tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance unexpectedness and a direction effect to spectators without impairing the direction effect of the water tank itself by projecting electronic images to the water tank and averting the direct entry of the light source of the electronic images to the eyes of the spectators and making the light source unconscious without losing the transparency of the wall surfaces of the water tank and the interior of the water tank. SOLUTION: The water tank 4 is provided with a screen 1 of a diffractive transmission type in proximity to the transparent wall surface within and/or on the outside of the water tank 4. The videos from a projector 5 arranged within the water at a prescribed angle with a straight line 9 orthogonal with the surface of the screen 1 are projected to the screen 1. The angle θwd formed by the straight line 9 orthogonal with the surface of the screen 1 and an optical axis 8 of the projector 5 is merely necessitated to be kept within a range of θwd±5 deg.C determined by the following equation when the incident angle of the incident light on the screen 1 for diffracting of the incident angle by the screen 1 in the atmosphere is defined as θd and the refractive index of the water as n(W): sinθwd=sinθd/n(W). When the refractive index n(W) of the water is assumed to be 1.333, the θwd determined by the equation described above is approximately 20 to 31 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type image display device for projecting an image, that is, an image system for displaying an image by using a so-called projector, and more particularly to an image system for projecting an image by using a water tank. The present invention relates to a video system configured to entertain and enhance the effect of producing, attracting, and transmitting information to the audience.

[0002]

2. Description of the Related Art Generally, an aquarium itself has an eye-catching effect, such as fish swimming in a transparent wall, bubbles forming, rocks, and algae shimmering. The means of adding the effect to lighting was lighting. On the other hand, there is a type in which an electronic image is placed behind a water tank, and a virtual image inside the water tank is displayed to a viewer via the water tank. However, the screen of the electronic image itself does not have a sense of transparency, and it is difficult to see or view the aquarium from behind.

[0003]

Conventionally, there is no introduction of a technology having a more distinctive effect than relying on the effect of the water tank itself. However, losing the transparency of the aquarium wall could result in losing the possibility of viewing the aquarium from behind and reducing the extent of the environment and landscape.

In order to enhance the visual effect using the water tank, an electronic image is projected on the water tank without losing the transparency of the wall of the water tank and the inside thereof, and the light source of the electronic image is directly transmitted to the eyes of spectators. It is important not to be conscious and to be able to appreciate the aquarium from behind the electronic image.

[0005] The present invention provides a video system that utilizes the movement, flow, or fluctuation of water in a water tank to enhance the surprisingness and the effect for the audience without impairing the effect of the water tank itself. Is to do. Furthermore, it is one of the objects of the present invention to enhance the eye-catching effect and make it easier to convey information and advertising contents whose contents change one after another to the audience.

[0006]

In order to achieve the above object, an image system according to the present invention is provided with a diffractive transmission type screen in the vicinity of a transparent wall inside and / or outside a water tank, and the screen is provided with a screen. The projector is arranged so that image light from the projector is incident at a predetermined angle with a straight line orthogonal to the straight line, so that an image is projected inside and / or outside the water tank. It is.

When the projector is arranged in the water stored in the water tank, the predetermined angle (ie, the angle between the optical axis of the projector and a straight line orthogonal to the screen surface) is set to about 20 °. It is preferable to set it to 31 °.

[0008] The predetermined angle is θd, the incident angle of the incident light on the screen for diffracting the incident light in the atmosphere in the atmosphere is θd, and the refractive index of the liquid (eg, water) in the water tank is n (W). Where sin θwd = sin θd /
n (W). When actually arranging the projectors, the projector may be set within the range of θwd ± 5 ° obtained by the above equation.

That is, the present invention corrects a diffraction angle in a case where an image from a projector is transmitted through water and cleanly projects the image, and considers the refraction of light between the atmosphere and water in the projector. In this arrangement, a predetermined image can be viewed well without directly seeing the component projected from the viewer, and an arrangement capable of producing an image with great surprisingness and effect can be obtained. In addition, by using the diffractive transmission type screen for the water tank in this manner, it is possible to use the effect of adding the movement, flow, or fluctuation of the water in the water tank to the electronic image. Furthermore, without losing the possibility of watching the aquarium from behind, not only not to reduce the spread of the environment with the aquarium and the landscape, but also to project the electronic image on each of the transparent walls facing the aquarium, In addition, it becomes possible to show the water tank and the image so that mutual interference can be ignored.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of an image system according to the present invention, which is equivalent to an elevation view. In the figure, a diffraction transmission type screen 1 is affixed to the inside of the water tank 10 on a transparent wall surface 4 of the water tank 10, and the water tank 10 is filled with water. In the figure, other wall surfaces of the water tank 10 are omitted.
In the figure, a projector 5 is stored in a watertight housing 11, and the projection light of the projector 5 is projected and imaged from a transparent window of the watertight housing 11 onto a diffractive transmission type screen 1. The center line of the light beam (that is, the optical axis 8 of the projector 5) is perpendicular to the vertical line 9 (that is,
An angle of θwd (a diffraction angle of the diffractive transmission screen in water, which is an incident angle of incident light that the diffractive transmission screen 1 can diffract in water) with respect to a straight line perpendicular to the surface of the diffractive transmission screen 1. Has made.

The operation of the diffractive transmission type screen 1 in the atmosphere will be described with reference to FIG. 2 for the supplementary explanation although it is in the middle of the first embodiment. In FIG. 2, light along the optical axis 8 of the projector 5 with respect to a vertical line 9 set at the center of the diffraction-transmission screen 1 is θd in the positive direction with respect to a vertical line 9 set at the center of the diffraction-transmission screen 1 (atmosphere). The angle is the diffraction angle of the diffractive transmission screen 1 in the inside, that is, the angle of the diffractive transmission screen 1 (the incident angle of incident light that can be diffracted in the atmosphere).
In the figure, the transparent support substrate of the diffraction transmission type screen 1 is omitted. Most (70%) of the light projected and imaged on the diffractive transmission screen 1 is transmitted in the vertical direction of the diffractive transmission screen 1 as 6: diffraction component. On the other hand, some components (about 10%) are reflected, and other components (20%).
%) Is transmitted as the straight component 7 without diffraction. Although only the light passing through the center of the diffractive transmission type screen 1 has been described above, the diffracted component is transmitted in the vertical direction in other portions of the screen 1 although the angle of incidence is slightly changed. Light incident from other angles is transmitted without diffraction and appears quite transparent. The diffraction angle (in air) θd of the diffractive transmission screen 1 is usually 3
As a result of being designed at 5 °, the screen can thus see an electronic image formed with little loss of transparency and without looking directly at the projector 5, i.e. without looking directly at the strong light source. Here, θd has a tolerance of about ± 5 degrees with respect to the design value. That is, the diffraction angle θd of the diffractive transmission screen 1 in the atmosphere is approximately 30 ° to 40 °.
°.

Here, returning to the first embodiment, the operation of the diffractive transmission type screen 1 there will be described. In FIG. 1, assuming a thin air layer between the diffraction transmission screen 1 and the water 2, as in FIG.
Most of the light rays incident at an angle of θd (diffraction angle of the diffractive transmission screen (in the atmosphere)) in the positive direction with respect to a perpendicular line 9 set at the center of the diffractive transmission screen 1 in the virtual atmospheric layer. (70%) is 6: transmitted in the vertical direction of the screen 1 of the diffraction transmission type as a diffraction component. On the other hand, the direction of the linear component 7 after passing through the screen 1 is θd in the positive direction with respect to a perpendicular 9 set at the center of the diffractive transmission type screen 1.
(Diffraction angle of diffraction transmission screen (in air)). Here, the angle θwd formed by the center line (that is, the optical axis 8) of the light beam of the light projected by the projector 5 with respect to the perpendicular 9 formed at the center of the diffractive transmission screen 1.
(Diffraction angle of the diffractive transmission screen (underwater)) is the angle θd (the diffraction angle of the diffractive transmission screen (diffraction angle of the diffractive transmission screen) In the atmosphere)), assuming that the refractive index of water is n (W) and the refractive index of the atmosphere (air) is n (A) = 1,
From Snell's law (the law of refraction), it is determined by the following equation.

Sin θwd / sin θd = n (A) / n (W) = 1 / n (W) sin θwd = sin θd / n (W) (Equation 1) Here, the refractive index n (W) of water = 1.333 (Although there is some dispersion, the light wavelength is represented by a value of 587.76 nm), the diffraction angle (in the atmosphere) θd of the diffractive transmission type screen 1 is designed value 35.
In degrees, sin θwd = 0.43179 and θwd = 2
5.925 degrees. Since θd has a margin of about ± 5 degrees with respect to the design value as described above, θwd also has a tolerance of ± 5 degrees with respect to the value determined by the above equation (Equation 1). Therefore,
Diffraction angle θwd of diffraction transmission screen 1 in water
Is approximately 20 ° to 31 °. That is, if the projector 5 is arranged within this range, the image from the projector 8 can be projected on the inside or outside of the water tank.

Here, if the thickness of the virtual atmosphere layer is made to be infinitely small, it completely corresponds to the embodiment of FIG. Further, the distance L between the center of the diffractive transmission screen 1 and the projector 5 in the embodiment of FIG. 1 is set from the equivalent distance L (A) in FIG.

L = L (A) sin θd / sin θwd (Equation 2) On the other hand, the horizontal distance L (H) = Lcos θwd between the diffraction transmission screen 1 and the projector 5 in the embodiment of FIG.
Is set from the equivalent distance L (HA) = L (A) cos θd in FIG.

L (H) = Lcosθwd = (L (A) cosθd) cotθwd = L (HA) cotθwd (Equation 3) Under the condition that the above-mentioned diffraction angle (in the atmosphere) θd = 35 degrees, L
(H) = 1.184L (HA), 18.4% deeper. Here, assuming that the diffractive transmission screen 1 is 40 type (40 inches diagonal), L (A) is about 180 cm, L (HA) is 147 cm, L
Is 239 cm and L (H) is 174 cm. In this embodiment, the housing 11 is used, but the transparent window surface is perpendicular to the optical axis of the projector 5 to minimize the reflection loss of the projection light. When the place where the projector is installed is shallow, a semi-submerged box may be used instead of a complete housing. The diffractive transmission type screen 1 is laminated and adhered to the transparent wall surface 4 of the water tank with good adhesion. In particular, a uniform protective layer is formed at the end of the screen with a transparent and water-resistant adhesive. And good.

Here, attention should be paid to the illumination in the water tank, and it is necessary that the background of the diffractive transmission screen is not too bright. Therefore, the light from the light source does not directly irradiate the transparent wall surface of the water tank. It is set as follows. It is desirable to set the illumination around the water tank so that the light from the light source does not directly irradiate the transparent wall surface of the water tank and the surrounding wall surface.

According to the setting of the present embodiment described above, it is possible to project an electronic image on the water tank by projecting the water of the water tank onto the diffraction transmission screen attached to the wall of the water tank in the same manner as in the atmosphere. Without losing the transparency of the aquarium wall, it is possible to display bright, moving images, still images, text telops using CG and video equipment on the aquarium, and also see behind it, so that the effect of the aquarium itself is not spoiled, and the surprisingness is large. The effect for the audience will be very high. Such video and still images include tropical islands, flora and fauna, the sea, underwater,
Jukon, shark, tortoise, coral, beautiful tropical fish, or, in turn, the Antarctic waters, penguins, whales, squid,
Deep sea images, deep sea fish, anglers, myths, legends, story scenes, etc. are possible. Further, the optical path slightly fluctuates due to the flow, movement, and fluctuation of the water in the aquarium, resulting in a subtle fluctuation without having a significant effect on the image. In addition, it has the advantage of a diffractive transmission type in which the linear component is small and the projector hardly enters the field of view of the audience. In addition, since the scattering of the light beam of the projector is slightly larger than that in the air, the effect of visualizing the light beam also appears.

The second embodiment of the image system according to the present invention is the same as the first embodiment except that the diffractive transmission screen 1 is not adhered to the inside of the transparent wall 4 of the water tank but to the outside. is there. FIG. 3 is an enlarged view of the vicinity of the transparent wall surface 4 of the water tank according to the second embodiment. In this figure, the transparent wall surface 4 of the water tank is made of glass, and its refractive index is n (G).

Also in this figure, the center line of the light beam of the light projected by the projector 5 (that is, the optical axis 8) is θwd (the diffraction angle of the diffractive transmission screen (underwater) with respect to a perpendicular 9 which is set at the center of the diffractive transmission screen 1. )), And the direction of the linear component 7 after passing through the screen 1 is θd in the positive direction with respect to a vertical line 9 set at the center of the diffractive transmission screen 1 (the diffraction angle of the diffractive transmission screen ( In the atmosphere)). On the other hand, the angle formed by the optical axis 8 with respect to the perpendicular 9 on the transparent wall surface 4 of the aquarium is θgd.
Then, there is the following relationship with θd. sin θgd = (1 / n (G)) sin θd (Equation 4) On the other hand, the following relationship exists between θwd and θgd according to the law of refraction.

Sinθwd = (n (G) / n (W)) sinθgd From the relation of the equation (Equation 4), this becomes as the following equation, which coincides with the equation (Equation 1).

Sin θwd = (1 / n (W)) sin θd Here, θ at the transparent wall surface 4 of the glass tank is
gd is 22.481 degrees when θd is 35 degrees and the refractive index n (G) of glass is 1.5. However, from the overall dimensional relationship, the thickness of the glass is small, so if ignored, θwd, θd
Are common to the first embodiment, and are generally the same as in the first embodiment. Thus, the conditions for attaching a diffractive transmission screen through water and glass were also clarified. In addition to the same effects as in the first embodiment, there is an advantage that there is no need to empty the water tank and attach a diffractive transmission screen. If the audience does not reach the aquarium even when they reach, there is no risk of damaging the diffractive transmission screen 1.

In the first and second embodiments shown in FIGS. 1 and 3, the depth side is not shown. You can look further through the screen.

Furthermore, if the image viewing side is bright, from the other side of the transparent wall at the back, it looks as if nothing is reflected on the diffractive transmission screen, and moreover, the image viewing side is transparent. .

As described above, an image system using a water tank can be realized without losing the possibility of viewing the water tank from behind or reducing the spread of the environment and scenery.

Next, a third embodiment of the video system according to the present invention will be described with reference to FIG. In the third embodiment shown in FIG. 4, not only the transparent wall surface 4 'of the water tank is added to the back side of the first embodiment shown in FIG. A diffractive transmissive screen 1 'is also provided on a transparent wall surface 4', and a projector 5 'for projecting the diffractive transmissive screen 1' is connected to a projector 5
It is provided so as to face. By doing so, the projected image can be viewed on the diffractive transmission screen 1 'by the projector 5' from the back of the transparent wall surface 4 'of the water tank on the back side, and the diffractive transmission screen on the front side can be seen. The image on the screen 1 can be seen through almost invisible, and the situation on the front side can be heard. This is the same when viewed from the front side. The projected image can be viewed on the diffractive transmission screen 1, and the image of the diffractive transmission screen 1 ′ on the back side is hardly seen, but can be seen through. You can ask about the situation. As described above, the effect using the electronic image, which has not been possible in the past, can be performed in the water tank. If around the aquarium 4
If a surface can be used, it is possible to produce an electronic image with a sense of transparency on the four surrounding surfaces in this manner.

Next, a video system according to a fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment shown in FIG. 5, the depth of the water tank is reduced from that of the first embodiment shown in FIG. 1, and the projector 5 is placed in the atmosphere outside the transparent wall surface of the water tank on the back side. It has been placed. At this time, the optical axis 8 of the projector 5 forms an angle of θd with the perpendicular 12 standing on the transparent wall surface of the water tank in the outside atmosphere. On the other hand, in the water tank, similarly to the first embodiment, the optical axis 8 of the projector 5 forms an angle of θwd with the perpendicular 9 set at the center of the diffractive transmission screen. As described above, the light intensity slightly decreases due to the reflection of the light beam by the transparent wall surface 4 ′ of the water tank, but the same effect as in the first embodiment is obtained. In the present embodiment, as in the second embodiment, the diffractive transmission screen 1 is provided outside the transparent wall surface 4 of the front water tank.
May be provided. In addition, as a modification of the present embodiment, it can be made as in the third embodiment.

A fifth embodiment of the present invention will be described with reference to FIG. In the fifth embodiment of FIG. 6, the depth of the water tank is narrowed from the first embodiment of FIG.
The projector 5 is not only placed in the atmosphere outside the transparent wall 4 ′ of the water tank on the back side, but also faces the diffraction transmission type screen 1 into the air outside the transparent wall 4 ′ of the water tank on the back side. It is what I put on. In the present embodiment, the optical axis 8 of the projector 5 forms an angle of θd with the perpendicular 12 erected on the transparent wall of the water tank in the outside atmosphere, and most of the light is imaged and diffracted by the diffractive transmission screen 1, The viewer travels in parallel with the vertical line 9 at the center of the diffractive transmission screen, and observes the image as water through the water in the water tank and the transparent wall 4 of the water tank on the front side. In the present embodiment, in addition to the effects of the above-described embodiments, there is an effect of producing another world beyond the water. In addition, as a modification of the present embodiment, it can be made as in the third embodiment. At this time, it is preferable that the entire lighting condition is such that the inside of the water tank is bright and the outside audience side is darker than the inside of the water tank, the projector side is dark behind the screen seen by the audience, and the screen viewed from the audience through the water tank is bright. Visible, the image on the screen immediately before is almost invisible and almost transparent.

Although the depth of the water tank is narrow in the fifth embodiment, a wide water tank may be used so that people can swim in the water tank. People who swim in the water tank enjoy various effects by electronic images. be able to. That is, it can be applied to a swimming pool in the image of a resort or a swimming pool in a theme park. Furthermore, when viewed from the outside, people who swim inside can also be directing. This is also included in the present embodiment, and the range of application is wide.

A sixth embodiment of the present invention will be described with reference to FIG. In the sixth embodiment of FIG. 7, the depth of the water tank is reduced from that of the first embodiment of FIG.
The projector 5 (omitted in the figure) is not only placed in the atmosphere outside the transparent wall surface 4 'of the water tank on the back side, but also the diffractive transmission type screen 1 is placed underwater, and the transparent wall surface 4, 4' of the water tank. Installed without sticking. In the present embodiment, the light imaged and diffracted by the diffractive transmission screen 1 is emitted perpendicularly to the diffractive transmission screen 1 (considered by its principal axis),
The perpendicular 14 standing on the transparent wall 4 of the water tank on the front side
At a positive angle θw, and is emitted at an angle θao (ie, downward). At this time, the following relationship exists between θw and θao.

Sin θw = (1 / n (W)) sin θao (Equation 5) On the incident side of the diffractive transmission screen 1, the main axis of the incident light is in the positive direction with respect to a vertical line 9 set at the center of the diffractive transmission screen. θwd: Since it forms the angle of the diffraction angle (underwater) of the diffractive transmission type screen, it forms an angle of θwi = θwd + θw with respect to the perpendicular 13 standing on the transparent wall surface of the water tank. On the incident side of the light emitted from the projector 5 (omitted in the figure) to the water tank, the optical axis (center line of the light beam) 8 is incident at an angle of θai with the perpendicular 12 standing on the transparent wall surface of the water tank. The following relationship exists between θai and θwi.

Sin θai = n (W) sin θwi (Equation 6) Here, if θao is 15 degrees, θw is 11.196 degrees from the relation of (Equation 5), and θwd is the diffraction angle of the diffractive transmission screen ( Underwater) is 25.925 degrees as in the first embodiment, so θwi is 37.121.
And θai is 57.559 degrees from the relationship of (Equation 6). Although the reflection loss is large and the reflection loss is slightly large as compared with the case where the angle of incidence on the aquarium glass surface is parallel to the perpendicular, the image can be made to appear in the water above the line of sight of the audience, and the effect is large. On the other hand, the diffraction transmission screen 1
May not be performed, and this is also included in the present embodiment. The state of the light emitted from the projector 5 (omitted in the figure) entering the water tank is the same as in the above-described fourth embodiment, and the image can be made to appear in the water, and the effect is large. What should be noted in the present embodiment is that θwi has a critical angle of 48.6 degrees such that θai = 90 degrees. Θao at this time is 30.9 degrees,
No further angulation is possible in the present embodiment.
Actually, the reflection at the time of incidence becomes extremely large, so that the above-mentioned θao = 15 degrees is substantially close to the limit. On the other hand, the angle of the diffractive transmission screen 1 does not have to be set as described above, which corresponds to the case where θao = 0 °, which is also included in the present embodiment. In the present embodiment, when the depth of the water tank is large, the projector 5 (omitted in the figure) is naturally stored in the housing for use. In this case, the limitation of the critical angle on the projector side described above is eliminated, and a wide angle range of θao can be obtained. Furthermore, also in this embodiment, the arrangement corresponding to the third embodiment can be performed, and the image and the aquarium can be viewed from each of the facing wall surfaces 4, 4 'of the aquarium without interfering with each other.

A seventh embodiment of the present invention will be described with reference to FIG. In the seventh embodiment of FIG. 8, the water surface is low in the sixth embodiment, and light from the projector 5 (omitted in the drawing) (considered by the optical axis) is perpendicular to the vertical line 15 and θai ′ standing on the water surface. Incident on the water surface at an angle of. This light is refracted in water, and the vertical line 15
And θwi ′ = (90 degrees−θwi). The subsequent mathematical relationships are the same as in the fifth embodiment. Here, if θao is 45 degrees, θw is 32.037 degrees,
θwi is 57.962 degrees, θwi ′ is 32.038 degrees,
θai ′ is 45 degrees. In the present embodiment, the viewer can view the image at a larger elevation angle than in the sixth embodiment, and can produce an image of the light entering from the water surface, an image of the sun, and an image of the moon. At this time, since the angle θwi is 57.962 degrees, there is also an advantage that the straight component coming out of the diffractive transmission screen 1 is totally reflected by the transparent wall surface 4 of the water tank and does not come to the audience side. It should be noted in this embodiment that there is a critical angle as in the sixth embodiment, and in the present embodiment, θ
There is a critical angle of 48.6 degrees of θwi 'where ai' is 90 degrees. This gives θwi a lower limit of 41.4 degrees, thus giving a lower limit of 15.475 degrees of θw, and a corresponding lower limit of θao of 20.835 degrees. However, in reality, θai ′ is 56.246 degrees and θwi is 51.246 degrees.
411 degrees, θwi ′ is 38.589 degrees, and θao = 4
Five degrees would be the lower limit. As described above, in the sixth embodiment, the side having the smaller angle θao is shared, and in the seventh embodiment, the side having the larger angle θao is shared. In the present embodiment, when the depth of the water tank is large and the water depth is sufficient, the projector 5 (omitted in the drawing) is stored in a housing for use. In this case, the limitation of the critical angle on the projector side described above is eliminated, and a wide angle range of θao can be obtained. However, this case corresponds to the case where the depth of the water tank is increased in the sixth embodiment.

In each of the above embodiments, the projector 5
Are placed at the top and the diffractive transmission type screen 1 has been used at a positive diffraction angle, but these can be arranged upside down with respect to the perpendicular of the transparent wall surface of the aquarium. That is, since the projector 5 comes sufficiently below the eye level of the spectator, it is not necessary to look directly at the light source.

Next, an eighth embodiment of the present invention will be described with reference to FIG. In the present embodiment, the diffractive transmission screen 1 is arranged upside down with respect to a vertical line 9 set at the center of the diffractive transmission screen in the seventh embodiment, and therefore, the position of the projector 5 is very low. It is an arrangement that must not be done. In FIG. 9, the optical axis on the incident side of the diffractive transmission screen 1 is θw in a negative direction with respect to a vertical line 9 set at the center of the diffractive transmission screen 1.
d, and forms an angle of θwi = θwd−θw in a negative direction with respect to a perpendicular 13 standing on the transparent wall surface of the water tank. On the other hand, on the incident side of the light emitted from the projector 5 (omitted in the figure) to the water tank, the optical axis (center line of the light beam) 8 is incident at an angle of θai with the perpendicular 12 standing on the transparent wall surface of the water tank. θ
The relationship between wi and θai is given by the above (Equation 6). For example, if the emission angle (in the atmosphere) θao of the diffraction component from the transparent wall surface 4 of the water tank is 35 degrees (downward, positive direction), the incident angle (underwater) θw of the diffraction component to the transparent wall surface 4 of the water tank Is 25.925 degrees, θwi and θai are 0 degrees, and the light is vertically incident on the transparent wall surface 4 ′ of the aquarium and transmitted vertically. Next, if the emission angle (in the atmosphere) θao of the diffraction component from the transparent wall surface 4 of the water tank is 27 degrees, the incident angle (underwater) θw of the diffraction component on the transparent wall surface 4 of the water tank is 19.912 degrees. , Θwi is 6.013 degrees, and θai is 8.13 degrees.
027 degrees.

If the emission angle (in the atmosphere) θao of the diffraction component from the transparent wall surface 4 of the water tank is 22 degrees, the incident angle (underwater) θw of the diffraction component on the transparent wall surface 4 of the water tank is 16.3.
22 degrees, θwi is 9.603 degrees, θai is 12.848
Degree. Assuming that the angle of emergence of the diffraction component from the transparent wall 4 of the water tank (in the atmosphere) θao is 15 degrees, the angle of incidence of the diffraction component on the transparent wall 4 of the water tank (in water) θw is 11.19.
6 degrees, θwi is 13.968 degrees, θai is 18.769
Degree.

On the other hand, since the linear component 7 is emitted from the perpendicular 17 erected on the transparent wall 4 of the water tank of the diffractive component at θai (upward, negative direction), it passes far above the spectator and does not enter the spectator's eyes. . In the present embodiment, the angle of incidence on the aquarium is small and nearly perpendicular, so that the reflection loss can be kept small.
Further, in the present embodiment, when θao is 15 degrees, the diffractive transmission screen 1 is a 40-inch screen, and if the spectator is about 3 m away from the center by a horizontal distance, the diffractive transmission screen 1 is different from the spectator's eye height. The center of the screen 1 is about 80 cm higher, and the height of the projector is about 60 cm lower than the center of the diffractive transmission screen 1, but it is 20 cm higher than the eye height, so that the presence of the light source can be made less noticeable by shielding. If this point is emphasized, the lower limit of the angle θao of the diffraction component emitted from the transparent wall surface 4 of the water tank (in the atmosphere) is about 15 degrees. In this embodiment, as compared with the sixth and seventh embodiments, the angle at the time of incidence on the water tank is small (the reflection loss is also small), and the angle of emergence of the diffraction component from the transparent wall surface 4 of the water tank. The angle range of (in the atmosphere) θao is also large.
In the present embodiment, the same video effects as in the sixth and seventh embodiments are provided. In addition, it is even more effective in that the reflection loss is small and the linear component is not seen by the audience. Note that if θao is 0 degree in the present embodiment,
The position of the projector is far below the eyes, so it is easy to shield from the audience.

FIG. 10 shows a ninth embodiment of the present invention in which the eighth embodiment is turned upside down, and FIG. In this embodiment, the diffractive transmission screen 1 is far below the eye level of the audience. Further, since the straight component 7 comes to the feet of the audience, it is hard to see. In the present embodiment, the seabed, images related to the water bottom, that is, deep-sea fish, Ryugu,
It is suitable for displaying a world, a mysterious and legendary world, a different world, such as Urashima, sunken ships and treasures. In addition, the sun, the moon, the stars, and the like at the bottom of the water are unexpected displays.

[0039]

According to the present invention, an electronic image is projected on the aquarium without losing the transparency of the aquarium wall surface and without losing the transparency of the interior of the aquarium, and the light source of the electronic image is directly viewed by the audience. It was possible to perform the characterization so as not to be conscious of the water tank, and also to make it possible to appreciate the aquarium from behind the electronic image. In addition to the above-mentioned features, the movement and flow of water in the aquarium, or the fluctuation of the water in the aquarium can be utilized for the electronic image, thereby improving the surprisingness and the effect for the audience without impairing the effect of the aquarium itself. This enhanced the eye-catching effect and made it easier for the audience to convey information and advertising content, whose contents changed one after another. Moreover, the images are projected on each of the transparent walls of the aquarium, and there is almost no interference between them.
The feature that the view was not obstructed was able to be given, and the effect of directing to the audience and the effect of attracting customers were high. Furthermore, an image can be displayed even when the player is directed into a swimming pool where a person swims, and in addition to the person who swims in the pool itself, there is an applied effect that the image and the viewing tank can be used.

As described above, the present invention has a great effect not only as a medium for appreciation of a company entrance and a showroom, as a medium for entertainment, as a medium for explanation, exhibition, as a medium for advertising, but also as a medium for theme parks,
There is also an application effect as equipment for sports facilities.

[Brief description of the drawings]

FIG. 1 is a diagram showing an elevation view equivalent to a first embodiment according to the present invention.

FIG. 2 is a view showing an elevation view equivalent to the action of the diffraction transmission screen in the atmosphere.

FIG. 3 is a diagram showing an elevation view equivalent to a second embodiment according to the present invention.

FIG. 4 is a view showing an elevation view equivalent to a third embodiment according to the present invention;

FIG. 5 is a diagram showing an elevation view equivalent to a fourth embodiment according to the present invention.

FIG. 6 is a diagram showing an elevation view equivalent to a fifth embodiment according to the present invention.

FIG. 7 is an elevational view equivalent to a sixth embodiment of the present invention.

FIG. 8 is an elevational view equivalent to a seventh embodiment according to the present invention.

FIG. 9 is an elevational view equivalent to an eighth embodiment of the present invention.

FIG. 10 is an elevational view equivalent to a ninth embodiment of the present invention.

[Explanation of symbols]

1, 1 ': diffractive transmission screen, 2: water, 3: atmosphere,
4, 4 ': Transparent wall surface of water tank, 5, 5': Projector, 8, 8 ': Optical axis (center line of light beam), 9: Vertical line set at the center of diffractive transmission screen, θd: Diffraction transmission type Screen diffraction angle (in air), θwd ... Diffraction angle of diffractive transmission screen (underwater)

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Ryuichi Sumizawa 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Digital Media System Division, Hitachi, Ltd. (72) Inventor Masaki Sato Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa 292 Hitachi Media, Ltd. Digital Media System Division F-term (reference) 5C058 EA01 EA32

Claims (10)

[Claims] 1. A diffractive transmission type screen provided in close proximity to a transparent wall inside and / or outside a water tank, and projecting an image on the screen to project an image toward the outside and / or inside the water tank. And a projector for projecting the image, wherein the projector is arranged so that the optical axis of the projector makes a predetermined angle with a straight line perpendicular to the surface of the screen. system. 2. When the projector is arranged in water stored in the water tank, an angle between an optical axis of the projector and a straight line orthogonal to a surface of the screen is about 20 ° to 31 °. An image system using the aquarium according to claim 1, wherein: 3. A diffractive transmission type screen provided in the vicinity of a transparent wall surface inside and / or outside of the water tank, and projecting an image on the screen through the liquid inside the water tank, thereby forming the water tank. A projector for projecting an image toward the outside and / or inside of the water tank, wherein the incident angle of the incident light on the screen for diffracting the incident light in the atmosphere is θd, When the refractive index of the liquid is n (W), the angle θwd between the optical axis of the projector and a straight line orthogonal to the screen surface is in the range of θwd ± 5 ° determined by the following equation. An image system using a water tank, characterized by a projector. sinθwd = sinθd / n (W) 4. An image system using a water tank according to claim 3, wherein the liquid inside the water tank is water. 5. A diffractive transmission type screen is provided near a transparent wall surface of a water tank, and the screen is projected by a projector at a predetermined angle θd ± 5 degrees in the atmosphere without passing through water in the water tank. An image system using a water tank, wherein the image is projected toward the outside and / or inside of the water tank through the water in the water tank. 6. The video system using a water tank according to claim 5, wherein the screen is arranged at a position higher than a line of sight of a spectator watching the inside of the water tank. 7. The video system using a water tank according to claim 5, wherein the screen is arranged at a position lower than a height of a line of sight of a spectator watching the inside of the water tank. 8. The water tank according to claim 1, wherein said screen is provided on a plurality of wall surfaces of said water tank.
The video system according to any one of claims 1 to 7. 9. An image system using an aquarium according to claim 1, wherein the image projected on said screen is various environmental images. 10. An image system using an aquarium according to claim 9, wherein information including an advertisement is displayed on said screen in combination with said various environmental images.