JP2002244218A - Hologram display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive hologram display device which can automatically provide video for an observer regardless of whether the observer is on the front or the rear side. SOLUTION: The hologram display device 1 is composed of a hologram screen 2 and a projection device 3. The hologram screen 2 is composed of a transparent member 21, a hologram film 22, and a reflection body 23. The reflection body 23 reflects part of video light 31 and transmits the remainder. The hologram display device 1 has a 1st detecting means 41 which detects the observer 7 on the rear side and a 2nd detecting means 42 which detects the observer 7 on the front side and when they detect the observer 7, the projection device 3 projects the video light 31. The video light 31 is switched between mutually reverse states according to which of the 1st detecting means 41 and the 2nd detecting means 42 detects the observer 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hologram display device that projects video light onto a hologram screen and displays a full-color or monochrome moving image or still image.

[0002]

2. Description of the Related Art Conventionally, for example, at a doorway of a store,
A technology has been proposed in which a hologram display device is installed to provide an advertisement such as a full-color or monochrome moving image or a still image to an observer such as a visitor. As shown in FIG. 13, the hologram display device 9 includes a hologram screen 92 and the hologram screen 92.
And a projection device 93 for projecting the image light 931 to the image. The hologram screen 92 includes a transparent member 921 such as glass and a transmission hologram film 922 attached to the transparent member 921.

[0003] The hologram display device 9 has a sensor 94 for detecting an observer 7 who is a visitor at the entrance of the store, as shown in FIG. When the sensor 94 detects the observer 7, a detection signal is sent to the projecting device 93, and the projecting device 93 projects video light 931 onto the hologram screen 92, and the observer 7 automatically receives the image light 931. Providing images

[0004]

However, the above-mentioned conventional hologram display device 9 can provide images.
Only for the observer 7 on one side of the hologram screen 92. That is, for example, in the example shown in FIG. 13, an image can be provided to a visitor outside the store, but an image cannot be provided to a customer inside the store.

Therefore, in order to provide images to the observers 7 on both sides of the hologram screen 92, it is necessary to further install the hologram display device 9. That is, two hologram screens 92 and two projection devices 93 are required. Therefore, there is a problem that the system becomes complicated and costs increase.

The present invention has been made in view of such a conventional problem, and automatically provides an image to an observer regardless of whether the observer exists on the front side or the back side of the hologram screen. An inexpensive hologram display device is provided.

[0007]

According to a first aspect of the present invention, there is provided a hologram display device including a hologram screen and a projection device for projecting image light onto the hologram screen, wherein the hologram screen includes a transparent member and a transparent member. A transmission type hologram film attached
A reflector disposed on the back side of the hologram film, the reflector reflects a part of the image light transmitted through the hologram film and transmits another part, and the projection device includes: The hologram display device is disposed on the front side of the hologram screen, the hologram display device includes first detection means for detecting the presence of an observer on the back side of the hologram screen, and an observer on the front side of the hologram screen. And a second detecting means for detecting the presence of the observer. When the first detecting means or the second detecting means detects the presence of the observer, the projection device sends the image light to the hologram screen. The image light is projected and turned over when the first detecting means detects the observer and when the second detecting means detects the observer. Lying in the hologram display apparatus, characterized in that is configured to switch to state.

It is most remarkable in the present invention that the hologram screen has a reflector which reflects a part of the image light and transmits the other part, and the first detecting means controls the observer. That is, the image light is switched over between when the image light is detected and when the second detecting means detects the observer.

As the first detecting means and the second detecting means, for example, sensors using infrared rays, ultrasonic waves or the like can be used. That is, for example, the sensors are arranged at appropriate positions on the back side and the front side of the hologram screen, respectively. Detect.

[0010] In addition, "front side", "back side", "front side",
The terms "rear side" and "rear side" are expedient expressions. In this specification, the side on which the projection device is arranged is referred to as "front side", and the opposite side is referred to as "rear side". "

The projection device is, for example, a liquid crystal projector or the like, and the image is, for example, a full-color or monochrome still image or moving image. Also,
The hologram film may be directly attached to the transparent member, or may be attached to the transparent member via another member such as the reflector. And the reflector is
For example, it may be directly attached to the back surface of the hologram film (see Embodiment 1 and FIG. 1), or may be attached to the back surface of the transparent member (see Embodiment 3 and FIG. 11). ).

Next, the operation and effect of the present invention will be described.
As described above, the hologram screen has the reflector on the back surface side of the hologram film. Therefore, a part of the image light projected on the hologram screen and diffracted by the hologram film is reflected by the reflector, and another part is transmitted by the reflector. That is, the image light diffracted on the hologram screen goes to both the front side and the back side of the hologram screen.

Thus, an image can be displayed on both the front and back surfaces of the hologram screen.
Therefore, each of the hologram screen and the projection device is
Using the platform, images can be provided in two directions.
Therefore, an inexpensive hologram display device can be obtained.

Further, the hologram display device has the first detection means and the second detection means, and when the first detection means or the second detection means detects the presence of the observer, the hologram display device has the first detection means and the second detection means. Projects video light onto the hologram screen. Therefore, an image can be effectively provided to the observer.

The image light is switched over when the first detecting means detects the observer and when the second detecting means detects the observer. That is, when an observer is present on the back side of the hologram screen, image light is projected on the back side of the hologram screen so as to project a normal image that is not turned upside down. For example, when displaying an image of a character, the observer can normally read the character from the back surface of the hologram screen (see FIG. 8A). At this time, an inverted image is projected on the surface of the hologram screen (FIG. 8).
(B)).

On the other hand, when the observer is present on the front side of the hologram screen, the image light is turned upside down with respect to the image light when the observer is present on the back side. As a result, a normal image that is not turned over is projected on the surface of the hologram screen. At this time, an inverted image is projected on the back surface of the hologram screen. In this manner, the image light can be automatically switched appropriately according to the side on which the observer is present, and a normal image that is not inverted can be provided to the observer.

As described above, according to the present invention, an image can be automatically provided to the observer regardless of whether the observer exists on the front side or the back side of the hologram screen. A hologram display device can be provided.

Next, it is preferable that the reflector is disposed between the hologram film and the transparent member. As a result, the reproduced images do not overlap due to reflection on the front and back surfaces of the transparent member, and a good image can be obtained.

Next, according to a third aspect of the present invention, in the reflector, the transparent member is directly coated with a metal or a non-metal, or a resin film coated with a metal is attached to the transparent member. It is preferable that the transparent member is adhered to the transparent member. Thus, a reflector that efficiently reflects image light can be obtained, and a hologram screen can be easily manufactured.

Examples of the metal include aluminum, silver, gold, chromium and the like. Also, as non-metal,
For example, there are zinc sulfide and cerium oxide. Examples of the resin film include films of polyester, polyethylene terephthalate, and the like. Means for coating the transparent member or the resin film with a metal or the like include, for example, chemical plating, vacuum deposition, and sputtering.

Next, it is preferable that the transparent member is made of resin or glass.
As a result, a hologram screen that displays a high-quality image can be obtained at low cost. When the transparent member is a resin, a lightweight hologram screen can be obtained. Examples of the resin include polycarbonate, acrylic, and vinyl chloride.

Next, as in the invention according to claim 5, the hologram display device includes a third detecting means for detecting the presence of the observer within a predetermined distance from the back surface of the hologram screen; And fourth detecting means for detecting that the observer is present within a predetermined distance from the surface of the hologram screen, and when the third detecting means or the fourth detecting means detects the presence of the observer,
The projector may be configured to stop projecting image light onto the hologram screen by the projection device and to prevent zero-order light, which is image light not diffracted by the hologram film, from entering the eyes of the observer. preferable.

The predetermined distance is, for example, a distance at which the zero-order light may enter the eyes of the observer when the observer approaches within the predetermined distance. The image light is
For example, the light is projected onto the hologram screen from obliquely above or obliquely below. Then, as described above, a part of the image light is diffracted by the hologram film and travels toward the back surface and the front surface of the hologram screen.

However, some image light is transmitted straight without diffracting the hologram film. The zero-order light, which is image light that has passed straight through the hologram film, is transmitted through the reflector and travels toward the back side, and is reflected at the reflector toward the front side. These zero-order lights may be harmful if they enter the eyes of the observer.

Therefore, as described above, the third detecting means and the fourth detecting means detect that the observer is present within a predetermined distance at which the zero-order light may enter the eyes of the observer, and the image is displayed. Stop projecting light. This can prevent the zero-order light from entering the eyes of the observer. In addition, as the third detection means and the fourth detection means, for example, sensors using infrared rays, ultrasonic waves, or the like can be used.

Next, as in the invention according to claim 6, it is preferable that the projection device has a video projection blocking mechanism for blocking the video light. Thus, at the desired time,
The projection of the image light can be easily and accurately started or stopped.

Examples of the image projection cut-off mechanism include a mechanically operated shutter, a mechanism for changing the projection direction of the projection device, a mechanism for switching the image to a black screen, and a mechanism for turning on and off the power of the projection device. is there.

Next, as in the invention according to claim 7, the hologram display device is installed in a store, and the hologram screen faces the inside of the store, and the back surface faces the outside of the store. It can be located in stores. As a result, it is possible to obtain an inexpensive hologram display device that can automatically provide a normal image that is not turned upside down to both a visitor and a store entrant to the store.

Next, as in the invention according to claim 8, the hologram display device is installed in a store, and the hologram screen faces the outside of the store and the back surface faces the inside of the store. It can also be located outside the store. Also in this case, similarly, it is possible to obtain an inexpensive hologram display device that can automatically provide a normal image that is not turned upside down to both a visitor and a store visitor to the store.

Next, as in the ninth aspect of the present invention, the hologram screen can be fixed to a standing object by using a magnet, an adhesive, a magic tape, or a suction plate. Thereby, the hologram screen can be easily installed. Examples of the standing object include a window glass.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A hologram display device according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the hologram display device 1 of the present embodiment includes a hologram screen 2 and a projection device 3 that projects video light 31 onto the hologram screen 2.

As shown in FIG. 2, the hologram screen 2 includes a transparent member 21, a transmission type hologram film 22 attached to the transparent member 21, and a reflector disposed on the back surface 221 side of the hologram film 22. 23. As shown in FIG. 3, the reflector 23 reflects a part of the image light 31 transmitted through the hologram film 22 and transmits another part.

The projection device 3 is arranged on the surface 202 of the hologram screen 2 as shown in FIG. The hologram display device 1 includes a first detection unit 41 for detecting the presence of the observer 7 on the back surface 201 of the hologram screen 2 and a presence of the observer 7 on the front surface 202 of the hologram screen 2. And a second detecting means 42 for detecting.

As shown in FIGS. 1 and 4, when the first detecting means 41 or the second detecting means 42 detects the presence of the observer 7, the projecting device 3 causes the image light 31 to pass through the hologram screen. Project to 2. The image light 31 is
When the first detecting means 41 detects the observer 7 (FIG. 1) and when the second detecting means 42 detects the observer 7 (FIG. 4), the state is turned over.

That is, as shown in FIG. 1, when the observer 7 is present on the back surface 201 side of the hologram screen 2, the image light is displayed on the back surface 201 of the hologram screen 2 so as to project a normal image 33 which is not turned upside down. 31 is projected. For example, when displaying a character image 33,
As shown in FIG. 8A, the observer 7 can normally read the character from the back surface 201 of the hologram screen. At this time, an inverted image 34 is displayed on the surface 202 of the hologram screen 2 as shown in FIG. 8B.

On the other hand, as shown in FIG. 4, when the observer 7 exists on the front surface 202 side of the hologram screen 2, the image light 3 when the observer 7 exists on the back surface 201 side.
For 1, the image light 31 is turned upside down. As a result, the surface 202 of the hologram screen 2 is
A normal image 33 that is not turned over as shown in FIG. At this time, the hologram screen 2
On the back surface 201, an inverted image 34 as shown in FIG. 8B is displayed.

As means for switching the image light 31 to the inverted state, there are the following means. That is, for example, in the projection device 3 such as a liquid crystal projector, the direction of the image light 31 projected on the hologram screen 2 can be switched by inverting the signal input to the image signal processing circuit installed inside. Become.

The reflector 23 is provided between the hologram film 22 and the transparent member 21 as shown in FIG. That is, the reflector 23 is made of a polyester resin film coated with aluminum.

The above-mentioned aluminum is coated on the above resin film by about 70 μm by chemical plating, vacuum deposition, sputtering or the like. The reflector 23 is
As shown in FIG. 3, it is a half mirror that transmits a part of the image light 31. That is, the reflector 23 has a light transmittance of about 55% and a light reflectance of about 40%. Then, as shown in FIG. 2, the back surface 231 of the reflector 23 is attached to the front surface 212 of the transparent member 21 with an adhesive 111,
The hologram film 22 is adhered to the surface 232 of the reflector 23 with the adhesive 112.

Further, as shown in FIG. 1, the hologram display device 1 has a third detecting means 43 and a fourth detecting means 44. As shown in FIG. 5, the third detecting means 43 detects that the observer 7 is present within a predetermined distance L3 from the back surface 201 of the hologram screen 2. Further, the fourth detection means 44 detects that the observer 7 is present within a predetermined distance L4 from the surface 202 of the hologram screen 2.

The third detecting means 43 or the fourth detecting means 4
When 4 detects the presence of the observer 7, the projection of the image light 31 onto the hologram screen 2 by the projection device 3 is stopped as shown in FIG. This prevents the zero-order light 310 of the image light 31 that has not been diffracted on the hologram film 22 from entering the eyes of the observer 7.

As shown in FIGS. 1 and 3, the image light 31 is projected onto the hologram screen 2 from obliquely above. Then, as described above, a part of the image light 31 is diffracted on the hologram film 22 and the back surface 201 and the front surface 202 of the hologram screen 2 are separated.
Head to the side.

However, as shown in FIG. 3, there is also image light 31 which is transmitted straight without diffracting in the hologram film 22. The zero-order light 310 of the image light 31 that has passed straight through the hologram film 22 passes through the reflector 23 and travels obliquely downward on the back surface 201 side, and reflects on the reflector 23 and travels obliquely on the front surface 202 side. Some go down.

As shown in FIGS. 1 and 4, these zero-order lights 310 enter the eyes of the observer 7 when the observer 7 is separated from the hologram screen 2 by a predetermined distance L3, L4 or more. Absent. However, if the observer 7 does not stop the projection of the video light 31 when the hologram screen 2 is closer than the predetermined distances L3 and L4, as shown in FIG.
As shown in (A) and (B), the 0th-order light 3
10 may enter. The zero-order light 310 may be harmful if it enters the eyes of the observer 7.

Therefore, as described above, the third detecting means 43 and the fourth detecting means 44 allow the observer 7 to move the observer 7 within a predetermined distance L3, L4 within which the zero-order light 310 may enter. 7 is detected, and the projection of the image light 31 is stopped as shown in FIG. Thus, 0
This prevents the next light 310 from entering the eyes of the observer 7.

The predetermined distances L3 and L4 are distances at which the zero-order light 310 may enter the eyes of the observer 7 when the observer 7 approaches within the predetermined distances L3 and L4. is there. L3 <L1 and L4 <L2.

In addition, the above-mentioned projection device 3 has a structure shown in FIG.
As shown in (B), the image projection / reception mechanism 32 for blocking the image light 31 is provided. The video projection blocking mechanism 32
A shutter 321 that slides and opens and closes as shown by an arrow S by mechanical operation is used. The hologram screen 2 for the image light 31 is
Stop or start projecting on.

The hologram display device 1 of this embodiment is
As an example of a customer service system at a store,
This will be specifically described below. That is, the hologram display device 1 is installed in a store, and the projection device 3 is disposed in the store with the front surface 202 of the hologram screen 2 facing the inside of the store and the back surface 201 facing the outside of the store.
Then, various kinds of information and the like are provided to the store visitor and the store entrant by video. It is also possible to play audio simultaneously with video and provide information and the like in both video and audio.

As shown in FIG. 1, a window glass 5 of a store is used as a transparent member 21 constituting the hologram screen 2. That is, the reflector 23 and the hologram film 22 are sequentially adhered to the window glass 5 as the transparent member 21 and the hologram screen 2
Is composed.

As the first detecting means 41, the second detecting means 42, the third detecting means 43, and the fourth detecting means 44, sensors using infrared rays, ultrasonic waves or the like are used. Then, as shown in FIG. 1, on the back surface 201 side of the hologram screen 2, the first detection means 41 is arranged at a distance L1 from the hologram screen 2, and the third detection means 43 is arranged at a distance L3. Deploy. Also,
On the surface 202 side of the hologram screen 2,
The second detection means 42 is disposed at a distance L2 from the hologram screen 2, and the fourth detection means 44 is disposed at a distance L4.

The hologram display device 1 does not display an image when the observer 7 is not present in the vicinity. That is, as shown in FIG. 9B, the shutter 321 of the video projection blocking device 32 is closed to prevent the video light 31 from being projected onto the hologram screen 2.

Then, as shown in FIG. 1, the observer 7, who is a visitor, returns to the back surface 201 of the hologram screen 2.
When approaching the position of the distance L1 on the side, the first detecting means 41 detects the observer 7. This detection signal is output to the video light control circuit 45 as shown by the arrow A in FIG. Upon receiving the detection signal, the image light control circuit 45 sends a control signal to the projection device 3 so that the image light 31 that projects a normal image 33 that is not turned upside down is projected on the back surface 201 of the hologram screen 2. (Arrow E). At the same time, a control signal is sent to the projection device 3 so as to operate the image projection blocking device 32 and open the shutter 321 (arrow E).

Thus, the image light 31 is projected onto the hologram screen 2, and a normal image 33 as shown in FIG. 8A is projected on the back surface 201 of the hologram screen 2. At this time, an inverted image 34 as shown in FIG. 8B is displayed on the front surface 202. Therefore, a normal image 33 is provided to the observer 7 who is a visitor.

Next, as shown in FIG. 5, the observer 7 further approaches the window glass 5 of the store, that is, approaches the hologram screen 2 and reaches a position at a distance L3 from the hologram screen 2. Then, the third detecting means 43 detects the observer 7. This detection signal is output to the video light control circuit 45 as shown by the arrow C in FIG. 7, and the control signal (arrow E) from the video light control circuit 45 causes the video projection cut-off device 3 of the projection device 3 to output.
2 and the shutter 3 as shown in FIG.
Close 21. As a result, as shown in FIG. 5, the projection of the image light 31 onto the hologram screen 2 is cut off, the image is erased, and the zero-order light 310 is prevented from entering the eyes of the observer 7.

Conversely, as shown in FIG. 4, when the observer 7, who is going to go out of the store, approaches the position of the distance L 2 on the surface 202 side of the hologram screen 2, The detecting means 42 detects the observer 7. As shown by the arrow B in FIG.
Output to the image light control circuit 45. Upon receiving the detection signal, the image light control circuit 45 operates the hologram screen 2.
A control signal is sent to the projection device 3 so as to project the image light 31 that projects a normal image 33 that is not turned upside down on the front surface 202 (arrow E). At the same time, a control signal is sent to the projection device 3 so as to operate the image projection blocking device 32 and open the shutter 321 (arrow E).

As a result, the image light 31 is projected onto the hologram screen 2, and a normal image 33 as shown in FIG. 8A is projected on the surface 202 of the hologram screen. At this time, on the back surface 201, FIG.
An inverted image 34 as shown in FIG.
Therefore, a normal image 3
3 are provided.

Next, when the observer 7 further approaches the window glass 5 of the store and reaches a position at a distance L4 from the hologram screen 2, the fourth detecting means 44
Detects the observer 7. This detection signal is output to the video light control circuit 45 as shown by the arrow D in FIG. 7, and the control signal (arrow E) from the video light control circuit 45 causes the video projection cut-off device 32 of the projection device 3 to be output. Activate,
As shown in FIG. 9B, the shutter 321 is closed.
As a result, as shown in FIG. 5, the projection of the image light 31 onto the hologram screen 2 is cut off, the image is erased, and the zero-order light 310 is prevented from entering the eyes of the observer 7.

The hologram display device 1
Can be installed upside down with respect to the store. That is, it is also possible to arrange the projection device 3 outside the store, with the front surface 202 of the hologram screen 2 facing the outside of the store and the back surface 201 facing the inside of the store.

Next, the operation and effect of this embodiment will be described. The hologram screen 2 has the reflector 23 on the back surface 221 side of the hologram film 22 as described above. Therefore, as shown in FIG. 3, the image light 31 projected on the hologram screen 2 and diffracted by the hologram film 22 has a part thereof reflected by the reflector 2.
3 and the other part is transmitted through the reflector 23. That is, the image light 31 diffracted on the hologram screen 2 is applied to the surface 2 of the hologram screen 2.
It goes to both the 02 side and the back surface 201 side.

Thus, the hologram screen 2
An image can be projected on both the front surface 202 and the back surface 201. Therefore, since one hologram screen 2 and one projection device 3 can be used to provide images in two directions, an inexpensive hologram display device 1 can be obtained.

The hologram display device 1
Has the first detection means 41 and the second detection means 42, as shown in FIGS. 1 and 4, and the first detection means 41 or the second detection means 42 detects the presence of the observer 7. At this time, the projection device 3 projects the image light 31 onto the hologram screen 2. Therefore, an image can be effectively provided to the observer 7.

When the first detecting means 41 detects the observer 7 (FIG. 1) and when the second detecting means 42 detects the observer 7 (FIG. 4), the image light is detected. 3
1 are switched over to each other. This gives
According to the side where the observer 7 is present, the image light 3 is automatically set.
1 can be appropriately switched to provide the observer 7 with a normal image 33 that is not turned over, as shown in FIG.

Further, as shown in FIG.
Is disposed between the hologram film 22 and the transparent member 21 so that the surface 2 of the transparent member 21
A good image can be obtained without overlapping of reproduced images due to reflection on the rear surface 12 and the rear surface 211.

The reflector 23 is formed by attaching a polyester resin film coated with aluminum to the transparent member 21. Therefore, the reflector 23 that efficiently reflects the image light 31 can be obtained, and the hologram screen 2 can be easily manufactured. Further, since the window glass 5 is used as the transparent member 21, the hologram screen 2 for displaying a high-quality image can be obtained at low cost.

Further, as shown in FIG. 5, the hologram display device 1 includes the third detecting means 43 or the fourth
When the detection means 44 detects the presence of the observer 7, the projection device 3 stops projecting the image light 31 onto the hologram screen 2. This makes it possible to easily prevent the zero-order light 310 from entering the eyes of the observer 7.

Further, since the projection device 3 has the image projection cut-off mechanism 32, the projection of the image light 31 can be started easily and accurately or stopped at a desired time. In addition, the hologram display device 1 is installed in a store and can be used as a customer service system as described above. As a result, it is possible to obtain an inexpensive hologram display device 1 that can automatically provide a normal image 33 that is not turned upside down to both a visitor and a store entrant to the store.

The hologram display device 1
When is used as a customer service system, advertisements, information announcements, and the like can be performed using images. Therefore, in places where the surrounding environment is quiet, for example, advertisements and information announcements can be performed by video without using sound, and the problem of noise can be eliminated.

As described above, according to the present embodiment, an image can be automatically provided to the observer regardless of whether the observer exists on the front side or the back side of the hologram screen. A hologram display device can be provided.

Embodiment 2 As shown in FIG. 10, this embodiment is an example in which a mechanism for changing the projection direction of the projection device 3 is used as the image light blocking mechanism 320 for blocking the projection of the image light onto the hologram screen. is there. As shown by arrows R in FIGS. 10A and 10B, the projection device 3 is rotatably mounted on a holder 322 fixed to the ceiling 51 via a rotation shaft 323. And
The projection device 3 rotates around the rotation shaft 323 according to a control signal from the image light control circuit 45 (FIG. 7).

That is, the image light 3 is applied to the hologram screen 2.
When projecting 1, the projection device 3 is directed obliquely downward (in the direction of the hologram screen 2) as shown in FIG. On the other hand, when the projection of the image light 31 on the hologram screen 2 is stopped, as shown in FIG. 10B, the projection device 3 is directed obliquely upward (toward the ceiling 51). Other configurations are the same as those of the first embodiment.

Also in the case of this example, the projection of the image light 31 onto the hologram screen 2 can be started easily, easily and accurately at a desired time, or the projection can be stopped. be able to. In addition, the third embodiment has the same functions and effects as the first embodiment. Further, as the image light blocking mechanism, for example, a mechanism for switching an image to a black screen, a mechanism for turning on / off the power of the projection device, or the like can be used.

Embodiment 3 In this embodiment, as shown in FIG.
The hologram screen 20 is disposed on the
This is an example of the configuration. That is, the hologram screen 2
Reference numeral 0 indicates that the reflector 23 is attached to the rear surface 211 of the transparent member 21 with an adhesive 111. On the other hand, the hologram film 2 is provided on the surface 212 side of the transparent member 21.
2 is adhered by the adhesive 112. Other configurations are the same as those of the first embodiment.

In this case, as shown in FIG. 11, the image light 31 projected on the hologram screen 20 and diffracted by the hologram film 22 passes through the transparent member 21 and reaches the reflector 23. Then, a part of the image light 31 passes through the reflector 23 and proceeds to the back surface 201 side of the hologram screen 20, and another part is reflected by the reflector 23 and proceeds to the front surface 202 side of the hologram screen 20. . In addition, the third embodiment has the same functions and effects as the first embodiment.

Fourth Embodiment In this embodiment, as shown in FIG. 12, a hologram display in which the contents of an image are changed between when the observer 7 is on the front surface 202 side of the hologram screen 2 and when the observer 7 is on the back surface 201 side. It is an example of an apparatus. That is, when the first detecting means 41 detects the observer 7 (FIG. 1) and when the second detecting means 42 detects the observer 7 (FIG. 4), the image light for displaying different image information is different from each other. 31 is projected.

For example, when the above-mentioned hologram display device is installed in a store, it is difficult for a visitor to see FIG.
As shown in (A), a video with the word “WELCOME!” Is provided.
Providing a video with the words "THANK YOU!" In other words, the surface of the hologram screen 200 outside the store is
2 (A) is displayed, and a hologram screen 200 on the inside of the store is displayed as shown in FIG. 12 (B). Also,
At this time, the image light 31 is controlled so as to provide a normal image which is not turned upside down to the store visitor and the store opener. Others
This is the same as the first embodiment.

As a result, an image corresponding to the needs of the observer can be appropriately displayed. In addition, the third embodiment has the same functions and effects as the first embodiment.

Embodiment 5 In this embodiment, the above-mentioned hologram screen is used for standing objects.
This is an example of fixing using a magnet, an adhesive, a magic tape, or a suction plate. The hologram screen is configured by attaching a hologram film and a reflector to a portable transparent member made of resin or glass. The hologram screen is detachably fixed to an upright such as a window glass and used.

That is, in the first embodiment, the hologram film 22 is placed on the window glass 5 as the transparent member 21.
The hologram screen 2 is configured by adhering the hologram screen 2 and the reflector 23 (FIG. 1). In this embodiment, a portable resin plate or glass plate is used as the transparent member. The hologram screen is detachably fixed to a standing object such as a window glass. Others are the first embodiment.
Is the same as

In this case, the hologram screen can be easily installed at a desired place. Also,
Since the hologram screen is detachable from a standing object, the installation location can be easily changed. In addition, the third embodiment has the same functions and effects as the first embodiment.

In each of the above embodiments, as the means for blocking the zero-order light 310, a view control film for scattering incident light from a specific direction including the projection direction is provided on the back surface 221 side of the hologram film 22. There is also a means arranged on the surface 232 side of the reflector 23. Further, the hologram display device can be used not only in stores but also in various applications such as advertisements and information announcements in cars and trains.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a hologram display device according to a first embodiment when an observer is present on a back surface side.

FIG. 2 is a cross-sectional view of a hologram screen according to the first embodiment.

FIG. 3 is an explanatory diagram of how the image light projected on the hologram screen advances in the first embodiment.

FIG. 4 is an explanatory diagram of the hologram display device in Embodiment 1 when an observer is present on the front surface side.

FIG. 5 is an explanatory diagram of the hologram display device in Embodiment 1 when an observer is present in an area where zero-order light may enter the eyes.

FIG. 6 is an explanatory diagram of a problem in the first embodiment in a case where projection of image light is not stopped.

FIG. 7 is an explanatory diagram of transmission and reception of a signal of a video light control circuit in the first embodiment.

FIGS. 8A and 8B are explanatory diagrams of (A) a normal image and (B) an inverted image projected on a hologram screen according to the first embodiment.

FIGS. 9A and 9B are explanatory diagrams of (A) a state in which a shutter of an image projection blocking mechanism is opened and (B) a state in which a shutter is closed according to the first embodiment.

10A and 10B are explanatory diagrams of a state in which an image projection / blocking mechanism projects image light onto a hologram screen, and a state in which the image projection / blocking mechanism does not project image light onto a hologram screen in a second embodiment. FIG.

FIG. 11 is a cross-sectional view of a hologram screen in a third embodiment.

12A is an explanatory diagram of a video provided to a store visitor, and FIG. 12A is an explanatory diagram of a video provided to a store visitor in a fourth embodiment.

FIG. 13 is an explanatory diagram of a hologram display device in a conventional example.

[Explanation of symbols]

 1. . . Hologram display device, 2, 20, 200. . . Hologram screen, 201. . . Back side, 202. . . Surface, 21. . . Transparent member, 22. . . Hologram film, 23. . . Reflector, 3. . . Projection device, 31. . . Video light, 310. . . 0-order light, 41. . . First detection means, 42. . . Second detection means, 43. . . Third detection means, 44. . . 6. fourth detection means, . . Observer,

Claims (9)

[Claims] 1. A hologram display device comprising a hologram screen and a projection device for projecting image light onto the hologram screen, wherein the hologram screen comprises: a transparent member; A reflector disposed on the back side of the hologram film, the reflector reflects a part of the image light transmitted through the hologram film and transmits another part, and the projection device includes: The hologram display device is disposed on the front side of the hologram screen, the hologram display device includes first detection means for detecting the presence of an observer on the back side of the hologram screen; And a second detecting means for detecting the presence of the first detecting means or the second detecting means. When the step detects the presence of the observer, the projection device projects the image light onto the hologram screen, and the image light is generated when the first detection means detects the observer; A hologram display device characterized in that the hologram display device is configured to switch over to each other when the second detection means detects the observer. 2. The hologram display device according to claim 1, wherein the reflector is provided between the hologram film and the transparent member. 3. The reflector according to claim 1, wherein the reflector is formed by directly coating a metal or a non-metal on the transparent member, by attaching a metal-coated resin film to the transparent member, or by a metal. A hologram display device comprising a foil adhered to the transparent member. 4. The method according to claim 1, wherein:
The hologram display device, wherein the transparent member is resin or glass. 5. The method according to claim 1, wherein:
The hologram display device includes: third detection means for detecting the presence of the observer within a predetermined distance from the back surface of the hologram screen; And a fourth detecting means for detecting, wherein when the third detecting means or the fourth detecting means detects the presence of the observer, the projection device stops projecting the image light onto the hologram screen, A hologram display device configured to prevent zero-order light, which is image light not diffracted in the hologram film, from entering the observer's eyes. 6. The method according to claim 1, wherein:
The hologram display device, wherein the projection device has a video projection blocking mechanism for blocking the video light. 7. The method according to claim 1, wherein:
The hologram display device is installed in a store, and the projection device is disposed in the store with the front surface of the hologram screen facing the inside of the store and the back surface facing the outside of the store. . 8. The method according to claim 1, wherein:
The hologram display device is installed in a store, and the projection device is arranged outside the store, with the front surface of the hologram screen facing the outside of the store and the back surface facing the inside of the store. . 9. The method according to claim 1, wherein:
A hologram display device, wherein the hologram screen is fixed to a standing object using a magnet, an adhesive, a magic tape (registered trademark), or a suction plate.