JP2705510B2 - Image display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device,
More specifically, the present invention relates to a projection type image display device.

[0002]

2. Description of the Related Art A projection type image display device basically has
It is configured to project an image displayed on a liquid crystal panel or a CRT onto a screen plate, and the screen plate generally includes a Fresnel lens plate and a lenticular lens plate.
Therefore, there is an advantage that the screen can be easily enlarged as compared with the direct-view type using a CRT, and there are many examples of installation on a wall inside or outside the room. 9 (= 3 × 3), 16 (= 4
There is also known a usage method in which 25 (5 × 5) or more (5 × 5) projection type image display devices are juxtaposed vertically and horizontally to enlarge or display a television image or a video image.

[0003]

In the conventional projection type image display device, the width of the joint around the screen for fixing the screen plate is about 3 mm. Vertical and horizontal lines having a width of about 6 mm and not displaying an image appear. This is quite annoying, and it is desired to reduce the joint width.

In the case of a multi-image display configuration, for example, when it is desired to remove the screen plate of the central image display unit for the purpose of cleaning or replacement, the surrounding image display units are temporarily removed and the target image is removed. You must pull out the display unit, loosen the screws holding the screen plate, and remove the screen plate,
He had to work extremely hard and difficult.

On the other hand, the front part (or screen unit) holding the screen plate can be detached from the main body holding the projection unit, and the front part can be pushed out by a push rod slightly longer than the whole depth. Such a configuration is known. In order to enable the push-out by the push-out rod, in the conventional example, a housing frame is provided slightly inside to secure a space for passing the push-out stick from the back to the front.

[0006] However, even with this solution, a long and rigid bar which is hard to bend must always be prepared. In addition, since the frame of the housing is provided inside the outer shape, there is a disadvantage that when stacking and juxtaposing for multi-image display, it is difficult to properly position and fix the mutual units. .

Further, in the conventional example, expansion and contraction of the screen plate,
That is, thermal expansion is not considered. For example, when transporting overseas by ship, accidents in which the screen plate comes off during transportation due to temperature differences have frequently occurred.

[0008] An object of the present invention is to provide an image display device that solves such problems.

[0009]

According to the present invention, a row of projections having a predetermined pattern is provided at the lower end of a screen plate, and a row of openings for fitting the row of projections is provided on a bottom plate supporting the screen plate from below. To support the lower part of the screen plate.

Further, the upper end of the screen plate is elastically held by an elastic holding member, and at least one of the left and right ends of the screen plate is elastically held by the elastic holding member.

Preferably, the elastic holding member comprises a plate-like elastic member for gripping an end of the screen plate, and a fixing member for fixing the plate-like elastic member to a rigid portion of the front unit. A member grips the end of the screen plate at least at a corner thereof at a wide angle.

[0012]

By elastically holding the upper end of the screen plate and at least one of the left and right ends, the screen plate can be held by the expansion and contraction of the screen plate.

Further, by using the elastic holding member, the concealed area of the screen plate, that is, the joint width in a multi-image configuration can be reduced.

Since the screen plate can be pulled out upward, the screen plate can be removed and cleaned or replaced by only slightly pulling out the front unit.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. However, in the drawings, the vertical and horizontal directions are appropriately enlarged and reduced for easy understanding. That is, the length and width of the drawing are not proportional to the actual size. Thicknesses and the like that can be understood without illustration are omitted from the illustration.

FIG. 1 is a perspective view of one embodiment of the present invention. This embodiment includes a main body 12 on which the projection unit 10 is mounted or held, and a front unit (or screen unit) 14 which is detachable from the main body 12. FIG. 1 also shows an exploded perspective view of the main body 12. An exploded perspective view of the front unit 14 is shown in FIG.

First, the structure of the main body 12 will be described. Body 1
2 is basically a rectangular parallelepiped and includes a frame 20 for firmly holding 12 sides and other appropriate portions of the rectangular parallelepiped. The frame 20 is made of a lightweight and rigid rod material, for example, a prism material made of aluminum. In this embodiment,
The upper two sides of the frame extending in the depth direction have an intermediate portion as indicated by reference numerals 22 and 24 for mutual connection in the case of a multi-configuration.

The outer peripheral surface of the main body 12 has a bottom plate 26, side plates 28,
30, a back plate 32, and two upper plates 34, 36. These plates 26 to 36 are iron plates, and the bottom plate 26 is 1 mm
Thickness, the other plates 28 to 36 are 0.5 mm to 1 mm thick. Depressions are formed in upper portions of the side plates 28 and 30 in accordance with empty portions indicated by reference numerals 22 and 24. Upper plate 34, 36
Are also two for the same reason.

At the upper two corners of the back plate 32, holes 32a, 32a for passing an extruding rod to be described later are formed.

Needless to say, the projection unit 10
It is installed in the main body 12 in the direction of projecting an image on the screen plate of the front unit 14.

The structure of the front unit 14 will be described in detail with reference to FIG. The front unit 14 is also basically in the shape of a rectangular parallelepiped, and includes a frame 40 in which each surface of the rectangular parallelepiped is opened. The frame 40 is made of a lightweight and rigid rod material, for example, an aluminum prism material.

The screen plate 42 is elastically held on the front surface of the frame 40 so as to be easily detached and to absorb the expansion and contraction of the screen plate 42. In this embodiment, the screen plate 42 includes a Fresnel lens plate 44 and a lenticular plate 46, and the Fresnel lens plate 44 is located on the main body 10 side. The screen plate 42 includes a projection line 42a that is asymmetrical in the left-right direction at the lower part.

The bottom plate 48 closing the lower surface of the frame 40 is 1 m.
It is made of an iron plate having a thickness of m and has, near the front end thereof, an opening line 48a into which the projection line 42a of the screen plate 42 penetrates closely. The opening row 48a has an arrangement and a size corresponding to the projection row 42a of the screen plate 42a, thereby preventing the screen plate 42 from being mounted on the frame 40 upside down.

The screen plate 42 is elastically held at its upper end and left and right ends by gripping plates 50, 52, 54 having basically the same structure. The holding plates 50, 52, 54 are made of, for example, a stainless steel plate, and expand and contract the screen plate 42, particularly,
It has elasticity corresponding to expansion. Grip plates 50, 52, 5
4 is a screen plate 4 at one end, as clearly shown in FIG.
2 while holding the other end of the spacer 56, 58, 6
0, the frame 40 is formed by the stop plates 62, 64, 66.
It is fixed to. FIG. 3 is a cross-sectional view of the holding structure of the screen plate 42 by the grip plates 50, 52, 54, the spacers 56, 58, 60 and the stop plates 62, 64, 66.

As shown in FIG. 3, the spacers 56, 58,
The depth 60 is smaller than the depth of the stop plates 62, 64, 66, so that the grip plates 50, 52, 54 can be bent outward with respect to the expansion of the screen plate 42. Of course, when the screen plate 42 returns to its original state, the gripping plates 50, 52, 54 also return to their original positions.

The size of the grip plates 50, 52, 54 covering the front surface of the screen plate 42 may basically be about 1 mm or less. Since the row of projections 42a of the screen plate 42 is fitted into the row of openings 48a of the bottom plate 48, the grip plates 50, 52,
The reason 54 is mainly to prevent the screen plate 42 from falling forward. Since the holding plates 50, 52, 54 are plate materials, they can be manufactured with this width. However, in the present embodiment, in consideration of the manufacturing accuracy of the screen plate 42, the portions 50a, 52a, 5
4a is widened to about 2 mm.

FIG. 4 is a front view showing a state in which the screen plate 42 is mounted on the frame 40 by the bottom plate 48 and the grip plates 50, 52, 54. Although it is illustrated that there is a considerable gap between the end surface of the screen plate 42 and the grip plates 50, 52, 54, this is because the screen plate 42 and the grip plates 50, 52 , 54, the inner surfaces of the grip plates 50, 52, 54 abut or substantially abut the end surfaces of the screen plate 42, as also shown in FIG.

The positional relationship between the widened portion 50a at the end of the gripping plate 50 and the widened portions 52a, 54a at the ends of the gripping plates 52, 54 is not limited to the example shown in FIG. For example, the positional relationship shown in FIG. 5 or FIG. 6 may be used. 5 and 6, the end face of the screen plate 42 and the grip plates 50, 52, 54 are also used.
Are shown as if there is a considerable gap between them, but in reality, the inner surfaces of the grip plates 50, 52, 54 are, as shown in FIG. Abuts or almost abuts on the end face.

As described above, in this embodiment, the holding plate 50,
At 52 and 54, the screen plate 42 is maintained in that position, and just in case, the screen plate 42 is more securely held at both ends of the gripping plates 50, 52 and 54. As a result, the screen plate 4
In the display image 2, the portion concealed by the holding plates 50, 52, 54 is reduced, and the joint width can be basically reduced to about 1 mm or less. 3 × 3, 4
In the case of a multi-configuration such as x4, 5x5, etc., joints generated between adjacent screens can be reduced to about 2 mm or less in most portions except peripheral portions of individual screens. In the conventional example, the width of the joint was about 6 mm (= 3 mm × 2).

In this embodiment, the end portions of the screen plate 42 are entirely gripped by the gripping plates 50, 52, 54, but may be partially gripped like nails or fingers. However, this increases the risk of the screen plate 42 falling off.

Further, in this embodiment, since the screen plate 42 is elastically gripped from the end face direction by the grip plates 50, 52, 54, expansion and contraction of the screen plate 42 due to temperature change,
In particular, even if there is expansion, the grip plates 50, 52, and 54 curve outward to absorb the expansion of the screen plate 42, and hold the screen plate 42 at that position. That is, it becomes resistant to temperature changes.

Portions of the upper surface and the left and right surfaces of the frame 40 of the front unit 14 which are not closed by the stopper plates 62, 64, 66 are closed by iron plates 68, 70, 72 having a predetermined thickness.

Next, means for connecting the front unit 14 to the main body 12 and means for separating the front unit 14 from the main body 12 will be described. FIG. 7 is a central sectional view showing a state in which the image display units of the embodiment shown in FIGS. 1 and 2 are stacked in three stages. The state where the front unit 14 is pushed out of the main body 12 is shown for the center image display unit.
Illustration of the projection unit 10 is omitted.

The frame 20 of the main body 12 is provided with a through hole 80 extending from the back to the front unit 14 at a portion corresponding to the upper two sides extending in the depth direction. This through hole 8
The front unit 14 is pulled away from the main body 12 by inserting the push rod 82 at 0 and strongly pressing the front unit 14 from behind. As described above, since there is no frame material in the intermediate portions 22 and 24 in the depth direction, the push rod 82
Are exposed at the portions 22, 24.

The pushing rod 82 may have a length that is obtained by adding the pushing distance of the front unit 14 required for replacing and removing the screen plate of the front unit 14 to the depth of the main body 12. The push rod 82 has a screw coupling structure in the middle, and has a front half 82a and a rear half 82b.
Can be separated into two. The first half 82a is first passed through the penetration section 80, and then the second half 82b is
a. Accordingly, it is sufficient that substantially the length of the push rod 82 has a margin on the rear surface of the image display device of the present embodiment. At the rear end of the push rod 82, a flat hand 84 for pushing the push rod 82 with the palm is provided.

In this embodiment, even if the front unit 14 is pushed out with the push rod 82 at least to the position where the stopper plate 62 on the upper surface can be removed, the stopper plate 62, the spacer 56 and the gripper can be held even in the stacked state as shown in FIG. The plate 50 can be removed from the front unit 14 and the screen plate 42 can be pulled out upward. After replacing or cleaning the screen plate 42, it is mounted on the front unit 14 in the reverse order.
At this time, a flat plate material having a length equivalent to the width of the front unit 14 is pressed against the portion of the projection row 42a of the screen plate 42 or a portion slightly above the projection row 42a to thereby form the projection row 42.
a fits smoothly into the opening row 48 a of the bottom plate 48.

That is, in the present embodiment, even in the multi-display configuration, the screen plate of the image display device located at the middle or below can be removed as it is in the stacked state, and the replacement and cleaning of the screen plate is very easy. Become. In the prior art, when replacing or cleaning, the entire work had to be done and very heavy labor was required. Further, in the conventional example, it was necessary to secure a large space at the back of the device for the work of removing the screen plate, but in the present embodiment, such a space is also required to operate the push rod 82. Very narrow.

The main body 12 and the front unit 14 are provided with a projection 86 fixed to the frame 40 of the front unit 14,
By penetrating and locking the receiving portion 88 fixed to the second frame 20, they are integrally connected. A total of four pairs of the projection 86 and the receiving portion 88 are provided, two on the left side and two on the right side.

FIGS. 8 and 9 are enlarged views of the projection 86 and the receiving portion 88. FIG. FIG. 8 is a side view showing a state in which the protrusion 86 penetrates the receiving portion 88, that is, a state in which the front unit 14 is connected to the main body 12. FIG. 9 is a side view showing a state in which the protrusion 86 is detached from the receiving portion 88, that is, a state in which the front unit 14 is pushed out of the main body 12.

As can be seen from FIG. 9, the projection 86 is constricted at the middle portion in the longitudinal direction, while the receiving portion 88 is formed by connecting the constricted portion of the projection 86 to two steel balls 90, 90.
It is designed to be sandwiched between. Although not shown, the steel ball 90 is urged by an internal spring in a direction approaching the steel ball 90 on the opposite side.

When the projection 86 is moved toward the receiving portion 88, the portion of the projection 86 that extends laterally at the tip of the projection 86 becomes the receiving portion 8.
The steel balls 90, 90 of FIG. As a result, the projection 86, that is, the front unit 14, is fixed to the receiving portion 88, that is, the main body 12. Protrusion 8
In order to pull out from the receiving portion 88, a force greater than the spring urging force of the steel ball 90 in the direction in which the steel ball 90 is separated from the receiving portion 88 may be applied to the projection 86, that is, the front unit 14.

Although the configurations of the projection 86 and the receiving portion 88 are well known, even when the front unit 14 is attached to and detached from the main body 12, the distance between the projection unit 10 and the screen plate 42 is adjusted to a predetermined distance. There is an advantage that can be kept.

[0043]

As can be easily understood from the above description, according to the present invention, the joints for concealing the screen plate can be narrowed, and unnecessary vertical and horizontal lines in the case of a multi-structure are made inconspicuous. There is. Since the screen plate is elastically held, the screen plate does not fall off even when there is a large temperature change. In other words, it is possible to cope with a larger temperature change.

Further, according to the present invention, the screen plate can be easily removed. For example, even in a multi-image configuration, the screen plate can be removed without breaking the stacked state. This simplifies cleaning and replacement of the screen plate.

Since the space required for pushing the screen plate to the front can be provided, it can be installed in a narrow space behind the screen.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of the present invention.

FIG. 2 is an exploded perspective view of the front unit 14.

FIG. 3 is a sectional view of a holding structure of a screen plate 42;

FIG. 4 is a sectional view of a screen plate 42 and a holding structure thereof.

FIG. 5 is another example of the positional relationship between the grip plates 50 and 54 of the screen plate 42.

FIG. 6 is still another example of the positional relationship between the holding plates 50 and 54 of the screen plate 42.

FIG. 7 is a central sectional view in the case of three-stage stacking.

FIG. 8 shows the structure of the coupling between the front unit 14 and the main body 12;
It is a side view of a coupling state.

FIG. 9 shows the structure of the connection between the front unit 14 and the main body 12;
It is a side view of a separation state.

[Explanation of symbols]

10: Projection unit 12: Main body 14: Front unit (or screen unit) 20: Frame 2
2, 24: frameless part 26: bottom plate 28, 3
0: side plate 32: back plate 34, 36: upper plate 32a, 3
2a: hole 40: frame 42: screen plate 42
a: row of projections 44: Fresnel lens plate 46: lenticular plate 48: bottom plate 48a: row of openings 50,5
2, 54: gripping plates 50a, 52a, 54a: widened portions 56, 58, 60: spacers 62, 64, 66: stopper plates 68, 70, 72: iron plate 80: through hole 82:
Extruded rod 82a: First half 82b: Second half 84:
Hand contact 86: Projection 88: Receiving part 90: Steel ball

Claims (9)

(57) [Claims] 1. An image display device comprising a main body for holding a projection unit and a front unit for holding a screen plate at upper, lower, left and right ends thereof, wherein a lower end holding means of the screen plate is provided at a lower end of the screen plate. It is composed of a row of projections provided in a predetermined pattern, and a row of openings provided so that the row of projections is fitted to a bottom plate supporting the screen plate from below, and an upper end holding member of the screen plate holds the upper end of the screen plate. An upper end elastic holding member for elastically holding, wherein at least one of a left end holding member and a right end holding member of the screen plate is a side end elastic holding member for elastically holding a side end of the screen plate. Image display device. 2. The image display device according to claim 1, wherein the row of protrusions is asymmetrical in the left-right direction of the screen plate. 3. The upper-end elastic holding member comprises a first plate-like elastic member for gripping an upper end of the screen plate, and a fixing member for fixing the plate-like elastic member to a rigid portion of the front unit. 3. The image display device according to 1 or 2. 4. The image display device according to claim 3, wherein the first plate-like elastic member grips an upper end of the screen plate at least at a corner thereof widely in a vertical direction of the screen plate. 5. A second plate-like elastic member for gripping a side end of the screen plate, and a second fixing member for fixing the plate-like elastic member to a rigid portion of a front unit. The image display device according to any one of claims 1 to 4, comprising: 6. The image display device according to claim 5, wherein the second plate-like elastic member grips a side end of the screen plate at least at a corner thereof widely in the left-right direction of the screen plate. 7. The image display device according to claim 1, wherein the front unit is detachable from the main body. 8. At least one of the rigid frame pillars constituting the main body is provided with a through hole for an extruding rod for separating the front unit from the main body, and the extruding rod can be freely connected and separated at an intermediate position. The image display device according to claim 7. 9. An image display apparatus comprising: a main body for holding a projection unit; and a front unit detachable from the main body, comprising a screen plate, wherein at least one of rigid frame columns constituting the main body is provided. An image display device provided with a through hole for an extruding rod for separating the front unit from the main body, wherein the extruding rod is freely connectable and separable in the middle.