Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Reexamination Certificate
2001-12-06
2004-12-07
Juba, Jr., John (Department: 2872)
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
C359S001000
Reexamination Certificate
active
06829066
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a hologram screen that is capable of regenerating an image by diffracting projected light.
2. Description of Related Art
A hologram screen that is capable of regenerating an image by diffracting projected light has been conventionally utilized, for example, for the purpose of displaying an advertisement on a shop window. As a versatile form of the above-mentioned hologram screens a screen formed by applying a hologram film to a resin plate with an adhesive has been known.
However, in the above-mentioned conventional hologram screen, the hologram film is exposed at its surface. Therefore, the hologram film may be separated from the resin plate, or may be scratched or otherwise damaged.
The resin plate may also be damaged. The above-mentioned hologram film is applied to the resin plate with an adhesive, and it is difficult to separate the hologram film from the resin plate without damaging the film. Therefore, when the resin plate is damaged, it is not possible to replace the resin plate with a new one to reuse the hologram film. Therefore, once the resin plate is damaged, the expensive hologram film has to be discarded. Further, when the hologram screen is leased, it is not possible to extend the rental use for a long period due to the above-mentioned problem.
SUMMARY OF THE INVENTION
It is an object of the present invention to overcome the aforementioned problem associated with the previous hologram screen and to provide a hologram screen which is capable of preventing separation and damage of the hologram film, and permits the hologram film to be reused easily, and which can be rented satisfactorily for a long period.
According to a first aspect of the invention, a hologram screen is provided which comprises a hologram film having the function of diffracting the light projected from a projector, and a first and a second transparent members which sandwich the hologram film so as to cover the film both from a front surface and from a back surface, characterized in that at least one of the first and the second transparent members is replaceable.
The most remarkable feature of the present invention is that the first and second transparent members sandwich the hologram film so as to cover same both from a front surface and from a back surface.
Terms, “front surface” and “back surface”, are used herein only for convenience. As used herein, “front surface” means the surface on the side on which the first transparent member is located and “back surface” means the surface on the side on which the above-mentioned second transparent member is located.
Next, the operative effect of the present invention will be described.
In the above-mentioned hologram screen, the first and second transparent members sandwich the hologram film so as to cover same between them.
Therefore, there is no risk of the hologram film separating from the first transparent member or from the second transparent member. also, the hologram film is protected from being damaged.
Further, even if the first or second transparent member is damaged, the hologram film can be released from the sandwiching by the first and second transparent members and the damaged transparent member may be replaced with a new transparent member to thereby reuse the hologram film.
As described above, in accordance with the present invention, a hologram screen is provided in which the hologram film can be protected from separation and damage, and can be easily reused.
Next, according to a second aspect of the present invention, the first and second transparent members are preferably fixed to each other with screws.
The hologram film can be thereby easily and securely sandwiched between the first and second transparent members. Since the first and second transparent members can be easily detached from each other, reuse of the hologram film is further facilitated.
Next, according to a third aspect of the present invention, the screws can fix the first and second transparent members to each other by penetrating a through hole provided in one of the first and second transparent members and being threaded into a sprue or threaded hole provided in the other.
The hologram film can be thereby easily and securely sandwiched between the first and second transparent members, and the reuse of the hologram film is further facilitated.
When above-mentioned sprue (HELI-SERT) is used, there is no risk of damage to the first and second transparent members even if the first and second transparent members are attached and detached frequently.
According to a fourth aspect of the present invention, the above-mentioned screws can fix the first and second transparent members to each other by penetrating a through-hole provided in both first and second transparent members and being threaded into a nut.
In this manner, also in this case, the hologram film can be easily and securely sandwiched between the first and second transparent members, and the reuse of the hologram film is further facilitated.
There is no risk of damage to the first and second transparent members even if the first and second transparent members are attached and detached frequently.
Next, according to a fifth aspect of the present invention, the first and second transparent members can be fixed to each other with an adhesive.
In this case, a hologram screen having a good appearance and design can be obtained.
Next, according to a sixth aspect of the present invention, the first and second transparent members can be fixed to each other with a clip or clips.
In this case, a hologram screen that allows a high operational efficiency in mounting and replacing of the first and second transparent members.
Next, according to a seventh aspect of the present invention, the first and second transparent members are preferably formed from a resin, a glass, or a plastic film.
A hologram screen capable of regenerating a high quality images can be thereby obtained cheaply.
When the first and second transparent members are formed from a resin, a light weight hologram screen can be obtained.
When the first and second transparent members are formed from a plastic film, a hologram screen that can be applied to a window pane as has been done previously is obtained.
The above-mentioned resin may include, for example, polycarbonate, acrylic resin, vinyl chloride resin, and the like.
Next, according to an eighth aspect of the present invention, an anti-sticking agent is preferably interposed between the hologram film and at least one of the first and second transparent members.
For example, when the front surface of the hologram film and the first transparent member are of such a material property that they are likely to stick to each other, the above-mentioned anti-sticking agent is interposed between the front surface of the hologram film and the first transparent members. When the back surface of the hologram film and the second transparent member are of such a material property that they are likely to stick to each other, the above-mentioned anti-sticking agent may be interposed between the back surface of the hologram film and the second transparent members.
With such a construction, a gap is created between the hologram film and the first or second transparent member, and sticking of the hologram film to the first or second transparent member can be prevented. Degradation of image quality due to local sticking between the hologram film and the first or second transparent member can be thereby prevented. Also, in the state in which images are not being regenerated, the good design and appearance of the hologram screen can be maintained.
Next, according to a ninth aspect of the present invention, the aforementioned hologram film is comprised of a hologram layer that has the function of diffracting the light projected from a projector and a PET layer that has the hologram layer applied on at least one of the surfaces thereof and having a hard coat formed thereon. The above-mentioned anti-sticking agent is preferably interposed bet
Matsumoto Tooru
Suzuki Kazunori
Takada Kenichiro
Denso Corporation
Jr. John Juba
Nixon & Vanderhye P.C.
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