JP3497475B2 - Rear projector - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear projector that projects an image on the screen by projecting it from the back side of the screen, and more particularly to a technique for reducing the weight of a housing.

[0002]

2. Description of the Related Art Conventionally, there is a rear projector having a screen size larger than that of a CRT (Cathode Ray Tube). C
While the RT forms an image by utilizing the phenomenon of emitting light when the phosphor is irradiated with an electron beam, the rear projector projects the image from the back side of the screen and changes the transmitted light of the screen. It is used to form an image. The rear projector is positioned as a display (image display device), which is a high-end model of a television until now, and is used not only for watching movies but also for presenting images to a large number of people in educational facilities.

[0003]

By the way, in the past, rear projectors have been positioned as high-end models such as televisions, so that it is necessary to produce a high-class feeling as the screen size increases. I used furniture-like wood as my body. In addition, since the weight of the screen itself was large until then, there was an advantage in using heavy wood as the housing from the viewpoint of preventing the fall. Therefore, for example, if the screen size is 100 inches, the device weight of the rear projector is 500 kg.
Was over.

However, the floor load per square meter is generally limited to 300 kg or less.
Therefore, there is a problem in that even if an attempt is made to introduce a rear projector whose device weight exceeds 500 kg, the rear projector cannot be introduced because the load limit on the floor cannot be satisfied. Further, in the case of a large-sized rear projector that exceeds 100 inches, the presence of the housing with respect to the screen is visually low for human eyes, and the effect of producing a high-class feeling by the housing has become weak. Moreover, in the case of such a large rear projector, it is often used mainly in a school classroom or a conference room, and it is not always necessary to produce a high-class feeling.

Further, when the rear projector is carried on the floor of the facility, it is customary to use an elevator installed in the facility. However, in the case of a large rear projector having a screen size of more than 100 inches, there is a problem that it cannot be housed in the elevator car and therefore it is difficult to transport it to the installation site. As described above, in the case of a large rear projector having a conventional housing, unlike the small or medium-sized rear projector, there is a special tendency that the demerit of using wood as the housing becomes extremely remarkable. Due to such a peculiarity, it is not possible to meet the demand of consumers who need a large rear projector, and the spread of the large rear projector is hindered.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a rear projector which can be reduced in weight and cost and is excellent in portability.

[0007]

In order to solve the above problems, the present invention has the following constitution. That is, the rear projector according to the present invention includes a frame that is assembled in a box shape as a housing, a sheet material attached to the frame so as to form a side surface, a back surface, and an upper surface of the housing, and the housing. a screen mounted on the front side of, placed on the inside of the housing, and a projection device for projecting an image onto the screen from the rear side of the screen, the Sea
The rear projector is characterized in that the material is a non-flammable material .

In the rear projector, the sheet material has a light shielding property . In the rear projector, the sheet material is characterized <br/> Rukoto to have a dust-proof property. In the rear projector,
The projection device is disposed on the bottom surface side of the housing, and is supported by a front surface and a bottom surface side of the housing, and a projector that projects an image in a front direction of the housing with an optical axis substantially horizontal. The projection light reflected by the first reflection mirror is supported by the first reflection mirror that reflects the projection light from the projector and the upper surface side and the back surface side of the housing, and the projection light reflected by the first reflection mirror is directed toward the screen. And a second reflecting mirror that reflects the light. In the rear projector, the frame and the sheet material form a film structure.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a rear projector 100 according to this embodiment, and FIGS. 2 and 3 are three views of the rear projector 100 shown in FIG. FIG. 4 shows a state in which a light-shielding sheet material is attached to the rear projector shown in FIG. 1, and FIG. 5 is a development view of the sheet material. FIG. 6 is a diagram for explaining a connecting portion between the frame shown in FIG. 1 and the sheet material shown in FIG. FIG. 7 is a diagram for explaining the second embodiment according to the present invention.

In FIGS. 1 and 2, reference numeral 10 is a frame forming a part of the housing of the rear projector 100, which is assembled in a substantially box shape. The back side of this housing,
As shown in FIG. 3, wires 50A, 50B, 50C are stretched on the upper surface side and the side surface side, respectively, so that even if an external force is applied to the frame 10 assembled into a substantially box shape, the housing It is reinforced to prevent deformation.

On the front side of the casing made up of the frame 10,
As shown in FIGS. 4 and 5, a screen 80 is attached, and sheet materials 70A, 70B, and 70C are attached to the upper surface side, the side surface side, and the rear surface side of the housing, respectively. This sheet material 70A, 70B, 70C
Forms a side surface, a back surface, and an upper surface of the housing, and functions as a housing together with the frame 10 described above. Also, the sheet material 7
0A, 70B, 70C have a light-shielding property and a non-combustible property,
For example, the material used for fire fighting clothes is used. The reason for using a material having such properties as a sheet material is
This is because even if the inside of the housing is heated to a high temperature due to the heat generated by the projector 20, it is necessary to withstand this heat generation, and the unnecessary light emitted by the projector 20 is prevented from leaking to the outside.

As shown in FIG. 6, connecting tapes 90A and 90B are attached to the outer peripheral portion of the back surface of the screen 80 and the portion facing the frame 10, respectively, so that the screen 80 can be freely attached to and detached from the frame 10. It has become. The sheet materials 70A, 70B, 70C and the frame 10 are attached in the same manner. The screen 80 and the sheet materials 70A, 70 are not limited to this example.
A simple screw or hook may be used as the attachment member for B and 70C.

The description is now returned to FIGS. 1 and 2. Reference numeral 20 is a projector arranged on the bottom surface side of the housing, and projects an image toward the front direction of the housing with its optical axis substantially horizontal. Reference numerals 30A and 30B
Is a reflecting mirror for guiding the projection light of the projector 20 to the screen 80. Reflector 30A (first
Is a support 6 attached to the front side of the housing.
0A and a frame provided on the bottom surface side, and the reflection mirror 30B (second reflection mirror) is a support body 60B attached to the top surface side of the housing and a support body attached to the back surface side of the housing. It is supported by the body 60C. These projectors 20
The reflecting mirrors 30A and 30B are mounted inside the housing and constitute a projection device (no reference numeral) that projects an image from the back side of the screen 80 onto the screen 80. Code 4
0A is an adjuster for adjusting the height, reference numeral 40B
Is a caster for movement.

A support 60A for supporting the reflector 30A is attached to the front side of the housing, a support 60B for supporting one side of the reflector 30B is attached to the upper side, and a back side is attached to the rear side. Similarly, a support body 60C that supports the other side of the reflecting mirror 30B is attached. Reflecting mirror 3
When 0A and 30B are arranged, the reflecting mirror itself functions as a brace and acts to suppress the deformation of the substantially box-shaped housing. Therefore, the side brace 50C shown in FIG. 3 may be omitted as long as the required rigidity is obtained.

The rear projector 10 having the above structure
According to 0, the frame 10 and the sheet materials 70A, 70B,
Since the housing is configured by 70C, the weight of the housing itself is reduced, and the weight of the entire device is reduced. As a result, even if the screen size is increased, the increase in the weight of the casing due to the enlargement of the casing is reduced, and a lightweight and large rear projector can be realized. Therefore, it is possible to install without being restricted by the floor load.

Further, as the frame 10, an inexpensive material such as iron or aluminum is selected, and the sheet materials 70A, 70B,
Since it is possible to select an inexpensive material as 70C, it is possible to significantly reduce the cost of the device.
Therefore, it is possible to provide a rear projector suitable for applications that place importance on functions.

Further, by disassembling the frame 10 forming the casing and removing the sheet materials 70A, 70B, 70C, the rear projector can be carried as a plurality of small parts. Therefore, it is excellent in portability, and a large rear projector can be easily transported by a small number of people and installed at a target installation location without being restricted by a transportation means such as an elevator. Therefore, it is possible to reduce the installation work cost.

FIG. 7 shows an installation example of the rear projector 100 according to this embodiment. In this example, the rear projector 100 is built in a building. In the figure, a room 200 is a space 200 due to a wall 300.
It is divided into A and space 200B. Space 2
The audience is accommodated in 00A, and the space 200B is
The rear projector 100 is installed. On the wall 300,
A window 300A is provided at a site where the screen of the rear projector 100 is located. A viewer on the space A side views the image displayed on the screen of the rear projector 100 through the window 300A. Also, this wall 30
0 has a port 3 for entering and leaving the space 200B.
00B is provided.

As described above, when the rear projector 100 is installed in the space 200B, the working space is extremely limited. However, according to the rear projector according to this embodiment, each part is carried into the space 200B and assembled. Therefore, the installation work will not be hindered. Therefore, even a large rear projector can be easily built in. In the case of the built-in type as described above, since the space 200B has a light-shielding function, a non-combustible material having a dust-proof property rather than a light-shielding property may be used as the sheet members 70A, 70B, 70C.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and the present invention can be applied even if there is a design change or the like within a range not departing from the gist of the present invention. included. For example, in the above-mentioned embodiment, the sheet material is attached to the frame, but in this case, the curtain structure may be formed by the frame and the sheet material. As a result, the sheet material itself functions as a brace, and the rigidity of the housing can be obtained without using a brace wire.

Further, in the above embodiment, the sheet material is divided into a plurality of pieces and attached to the frame by the connecting tape, but the present invention is not limited to this, and the sheet material is formed into a bag shape. The box-shaped frame may be covered so as to wrap it. Of course, in this case as well, rigidity may be obtained by forming a curtain structure.

[0022]

As described above, according to the present invention, the following effects can be obtained. That is, a frame assembled in a box-like shape as a housing, a sheet material attached to the frame so as to form a side surface, a back surface, and an upper surface of the housing, and a screen attached to the front side of the housing. And a projection device that is placed inside the housing and projects an image from the back side of the screen onto the screen, so that weight reduction and cost reduction can be achieved and excellent portability is achieved. It becomes possible to realize a rear projector.

[Brief description of drawings]

FIG. 1 is a perspective view of a rear projector according to an embodiment of the present invention.

FIG. 2 is a trihedral view (front, side, top) of the rear projector according to the embodiment of the present invention.

FIG. 3 is a trihedral view (rear surface, side surface, upper surface) of the rear projector according to the embodiment of the present invention.

FIG. 4 is an external view showing a state in which a light-shielding sheet material is attached to the rear projector according to the embodiment of the present invention.

FIG. 5 is a development view of the sheet material according to the embodiment of the present invention.

FIG. 6 is a diagram for explaining a connecting portion between a frame and a sheet material forming a housing according to the embodiment of the present invention.

FIG. 7 is a diagram showing an installation example of a rear projector according to the present invention.

[Explanation of symbols]

100: Rear projector 10: Frame 20: Projector 30A, 30B: Reflecting mirror 40A: Adjuster 40B: Casters 50A-50C: Wire 70A-70C: Sheet material 80: Screen

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Claims (5)

(57) [Claims] 1. A frame assembled in a box-like shape as a housing, a sheet material attached to the frame so as to form a side surface, a back surface and an upper surface of the housing, and a front surface side of the housing. And a projection device that is placed inside the housing and projects an image onto the screen from the back side of the screen , wherein the sheet material is a non-flammable material. Rear projector to do. 2. The rear projector according to claim 1, wherein the sheet material has a light blocking effect . 3. The rear projector according to claim 1, wherein the sheet material has a dustproof property . 4. The projector, which is arranged on the bottom side of the housing, projects the image toward the front direction of the housing with the optical axis substantially horizontal, and the front side of the housing. A first reflecting mirror that is supported by the bottom surface side and reflects the projection light from the projector, and a projection light that is supported by the upper surface side and the back surface side of the housing and that is reflected by the first reflecting mirror. The rear projector according to any one of claims 1 to 3, further comprising a second reflecting mirror that reflects toward the screen. 5. The rear projector according to claim 1, wherein the frame and the sheet material form a film structure.