JP3242579B2 - Multi-vision screen device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-vision screen device for displaying a large-screen composite image by combining a plurality of unit images projected from a plurality of projection units.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view of a conventional screen device disclosed in, for example, JP-A-8-82854. In the figure, a projection unit 2 for projecting a unit screen is provided on each of four divided frames 1 combined vertically, horizontally, and vertically.
Is provided. Further, a Fresnel lens 3 for refracting an image projected from the projection unit 2 toward the front is attached to the front of each divided frame 1. On the front surface of the Fresnel lens 3, a screen plate (diffusion plate or lenticular) 4 for visualizing an image by diffusion is attached by a screen frame 5.

In such a screen device, the joints 9 are conspicuous because the holding portions 1a of the Fresnel lens 3 of the divided frame 1 are located outside the enlarged projection screen 8, respectively. On the other hand, as shown in FIGS. 6 and 7, a method of holding the Fresnel lens 3 using a leaf spring 10 and reducing the width of the joint 9 is also known. Further, as shown in FIG. 8, a leaf spring 1 for holding upper and lower Fresnel lenses 3 is provided.
There is also known a method of alternately arranging 0a and 10b along the longitudinal direction of the joint 9 to further minimize the joint 9.

FIG. 9 is a sectional view of a conventional screen device disclosed in, for example, JP-A-7-56236, and FIG. 10 is a plan view of FIG. In this example, the reinforcing plate 11 is made of the same material as the Fresnel lens 3 in expansion and contraction due to temperature and humidity.
Are mechanically connected to the divided frame 1 via a shaft 12. The Fresnel lens 3 is connected to the reinforcing plate 11 by wires 13 and springs 14.

Next, the operation will be described. From each projection unit 2, a unit image having a certain area is projected. At this time, by adjusting the position (x, y, z) and the projection angle (xθ, yθ, zθ) of the projection unit 2, the projection screen is adjusted to the four edges of the Fresnel lens 3. Therefore, in the example of FIG. 5, the thickness of the divided frame 1 remains as the width of the joint 9 in the examples of FIGS. 9 and 10, the refraction of the ear 11a of the reinforcing plate 11 is
Unlike this, since the divided frame 1 becomes a shadow, the joint 9 remains. Further, the wire 13 also appears on the projection screen.

[0006]

In the conventional multi-vision screen device configured as described above,
Since the joints 9, the ears 11a, the wires 13 and the like are visible when the entire screen is viewed from the front, there is a problem that the image quality as a whole deteriorates.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a multi-vision screen device capable of making joints inconspicuous and improving image quality. .

[0008]

According to a first aspect of the present invention, there is provided a multi-vision screen device comprising a frame, a plurality of projection units attached to the frame, and a projection unit provided in front of the frame. Transparent front and rear reinforcing plates, a plurality of Fresnel lenses sandwiched between the front and rear reinforcing plates and arranged to face each projection unit, and a screen plate sandwiched between the front and rear reinforcing plates to visualize an image And a screen unit having
Frame through a slide shaft extending parallel to the side
The screen unit slides
When the mounting part to the slide shaft moves along the slide shaft,
That is, expansion and contraction of the screen unit are absorbed .

A multi-vision screen device according to a second aspect of the present invention is provided with a tension means provided between the frame and the screen unit, for pulling a peripheral portion of the screen unit outward.

A third aspect of the present invention provides a multi-vision screen device using a plurality of constant load springs as tension means.

[0011]

According to a fourth aspect of the present invention, there is provided a multi-vision screen device which is provided between a center of a side of a screen unit and a frame, and restricts movement of the screen unit in a direction parallel to the side. Means.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a multi-vision screen device according to an embodiment of the present invention.
2 is an enlarged view of a main part of FIG. 1, FIG. 3 is a front view of FIG. 1, and FIG. 4 is a partially cutaway front view showing an enlarged main part of FIG.

In the figure, four projection units 21
It is mounted on a common metal frame 22 so as to be adjustable in six axes. On the front surface of the frame 22, a screen unit 23 is provided. This screen unit 2
3 is a transparent front and rear reinforcing plates 24, 25, respectively.
Four Fresnel lenses 26 sandwiched between the front and rear reinforcing plates 24 and 25 and arranged to face each projection unit, and a screen sandwiched between the front and rear reinforcing plates 24 and 25 to visualize an image. Diffusion plate 2 as plate
7. Bolt 28 and nut 2 for integrating them
9. Also, front and rear reinforcing plates 24, 2
5, the Fresnel lens 26 and the screen plate 27 are each made of an acrylic material, and the Fresnel lens 2
The parts other than 6 are composed of one piece.

The bolt 2 in the screen unit 23
The mounting bracket 30 is fixed to the mounting position 8. A slide shaft 31 extending parallel to a side of the screen unit 23 to which the mounting bracket 30 is mounted is mounted on the mounting bracket 30 so as to be slidable in the axial direction. The winding portion 32 fixed to the outer peripheral portion of the frame 22 is provided with a base end of a belt-shaped constant load spring 33 as a pulling means.
The distal end of the constant load spring 33 is connected to the slide shaft 31 via a connecting member 34. A roller 35 for guiding a constant load spring 33 is attached to the frame 22. The screen unit 23 includes a plurality of constant load springs 3.
The tension is given by 3.

At the center of each of the left, right, upper and lower sides of the front surface of the frame 22, a frame side center stator 36 is fixed.
At the center of each of the left, right, upper and lower sides of the screen unit 23,
The screen-side stator 37 is fixed. At the center of the screen-side stator 37, a guide groove 37a is provided. A guide 38 that engages with the guide groove 37a is fixed to the center of the frame side center stator 36. A regulating means 39 is provided by these stators 36 and 37 and the guide 38.
Is configured. Also, the mounting bracket 30, the slide shaft 3
1, the winding unit 32, the constant load spring 33, and the connecting member 34 constitute an attaching means 40.

Next, the operation will be described. From each projection unit 21, a unit image having a certain area is projected. At this time, the projection screen is adjusted to the four edges of the Fresnel lens 26 by adjusting the screen size, the position (x, y, z) of the projection unit 21 and the projection angle (xθ, yθ, zθ). The Fresnel lens 26 is provided for each projection unit 21, and is fixed by being sandwiched between the reinforcing plates 24 and 25. Therefore, the adjacent sides of the Fresnel lens 26 abut against each other, and the joint element is only the boundary surface between the Fresnel lenses 26. Therefore, the joint width can be set to, for example, 0 to 0.5 mm, and the image quality is improved.
In addition, replacement of the components of the screen unit 23 is easy.

An acrylic screen unit 2
3 has low rigidity and is difficult to transmit force in the plane direction.
Although it is difficult to achieve flatness, since the screen unit 23 is averagely pulled from four sides by using the constant load spring 33, flatness can be obtained and the image quality can be further improved. Further, since the constant load spring 33 is used as the tension means, the screen unit 23 can always be tensioned with a constant load regardless of the expansion and contraction of the screen unit 23 due to temperature and humidity.

Further, acrylic is a material which is relatively large in expansion and contraction due to temperature and humidity.
Since all of the laminated materials of No. 3 are made of the same acryl, peeling and warping due to a difference in expansion and contraction are prevented. Further, since the mounting portion of the screen unit 23 to the frame 22 is movable in the axial direction of the slide shaft 31, the expansion and contraction of the entire screen unit 23 is absorbed by the slide.

Further, since the guide 38 is engaged with the guide groove 37a at the center of the side of the screen unit 23, the influence of the expansion and contraction of the screen unit 23 can be minimized.

In the above example, the diffusion plate 27 is shown as the screen plate, but it may be a lenticular or the like. Further, in the above example, a screen device using four projection units 21 is shown, but the number of projection units 21 (the number of Fresnel lenses 26) is not limited to this. Further, the material of the screen unit 23 is
It is not limited to acrylic.

[0022]

As described above, the multi-vision screen device according to the first aspect of the present invention has a structure in which the screen plate and the plurality of Fresnel lenses are sandwiched between the front reinforcing plate and the rear reinforcing plate. The joint is only the boundary between the Fresnel lenses, and the joint width can be minimized.
Image quality can be improved. Screen Uni
The slide is extended via a slide shaft extending parallel to the side.
Mounted on the screen and the screen unit
The mounting part to the ride axis moves along the slide axis
To absorb the expansion and contraction of the screen unit
Screen, the screen is expanded and contracted by the screen unit.
Can be prevented, and high image quality can be maintained.

In the multi-vision screen device according to the second aspect of the present invention, a tension means is provided between the frame and the screen unit, and the peripheral portion of the screen unit is pulled outward. Can be improved, and the image quality can be further improved.

According to the third aspect of the present invention, since a plurality of constant load springs are used as the tension means, a constant tension can be applied to the screen unit regardless of the expansion and contraction of the screen unit.

[0025]

According to a fourth aspect of the invention, there is provided a multi-vision screen device, wherein a regulating means for regulating the movement of the screen unit in a direction parallel to the side is provided between the center of the side of the screen unit and the frame. Therefore, the influence of the expansion and contraction of the screen unit can be minimized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a multi-vision screen device according to an example of an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a front view of FIG. 1;

FIG. 4 is a partially cutaway front view showing an enlarged main part of FIG. 3;

FIG. 5 is a cross-sectional view showing a first example of a conventional screen device.

FIG. 6 is a cross-sectional view showing a second example of a conventional screen device.

FIG. 7 is a front view of FIG. 6;

FIG. 8 is a front view showing a third example of a conventional screen device.

FIG. 9 is a sectional view showing a fourth example of a conventional screen device.

FIG. 10 is a plan view of FIG. 9;

[Explanation of symbols]

21 projection unit, 22 frame, 23 screen unit, 24 front reinforcing plate, 25 rear reinforcing plate, 2
6 Fresnel lens, 27 diffusion plate (screen plate),
31 Slide shaft, 33 Constant load spring (tensile means), 3
9 Regulatory measures.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-249633 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 21/56 H04N 5/74

Claims (4)

(57) [Claims] 1. A frame, a plurality of projection units mounted on the frame, and a transparent front and rear reinforcing plate provided in front of the projection unit of the frame, respectively, between the front and rear reinforcing plates. sandwiched a screen unit having a screen plate for visualizing a plurality of the Fresnel lens, and an image sandwiched the front and rear surfaces reinforcing plates which are arranged opposite to each projection unit, the screen unit Extends parallel to the side
It is attached to the frame via the ride shaft,
The mounting part of the screen unit to the slide shaft is
By moving along the slide axis, the screen
A multi-vision screen device wherein the expansion and contraction of a lean unit is absorbed . 2. A multi-vision screen apparatus according to claim 1, further comprising a tension means provided between the frame and the screen unit, for pulling a peripheral portion of the screen unit outward. . 3. The multi-vision screen device according to claim 2, wherein the tension means is a plurality of constant load springs. 4. A control device provided between the center of a side of the screen unit and the frame, and configured to control movement of the screen unit in a direction parallel to the side. Claims 1 to 3
Multi-Vision screen device Zurekani described.