JPH06289489A - Multiple vision screen fixing device - Google Patents

Abstract

PURPOSE:To provide a multiple vision screen fixing device capable of preventing the warpage of a screen caused by temperature and humidity, keeping appropriate flatness, and keeping bonding strength between the screen and a frame well even though the depth of the groove of the frame for inserting the screen is small. CONSTITUTION:The groove of the frame 4 surrounding and supporting the periphery of the screen 5 is made minimum, and a space obtained by considering the expanding amount of the screen 5 in a plane direction caused by the temperature and the humidity is provided. Thus, the warpage of a lenticular sheet 11 caused by the change of the temperature and the humidity can be prevented, and projected light from a projecting unit can be received by the lenticular sheet 11 on a certain position, so that the distortion of a video is extremely reduced so as to obtain an effect making the video look well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection unit (a unit having a projection section composed of a projection type cathode ray tube and an optical means composed of a reflecting mirror or a lens for guiding the projection light from the projection section to a screen. ), A screen unit (a unit consisting of a screen for projecting the projection light of the projection unit and its system stopping means), and a housing (a set of parts for connecting the projection unit and the screen unit to shield and support them). The present invention relates to a multi-vision device for fixing a screen, in which a plurality of core units are assembled vertically and horizontally to form a large screen.

[0002]

2. Description of the Related Art In this type of multi-vision, images projected from a plurality of projection units are enlarged and projected on the back surface of a screen to display a large-screen composite image on the screen.

When the displayed image becomes large in screen size, the screen area inevitably becomes large, and it is necessary to form the entire screen with a single sheet member, which is a constraint for transportation, productivity and production. It becomes difficult from the viewpoint of equipment.

For this reason, a large screen multi-vision screen is generally formed by combining a plurality of screens.

In order to improve the brightness of the screen and the resolution of the image, each screen has a lenticular sheet having a plate thickness of about 1 mm and a center of the screen in order to form a fine uneven cross section having the vertical direction as the longitudinal direction. It is composed of a Fresnel lens sheet having a plate thickness of about 3 mm and having concentric concavities and convexities.

As a screen device in which a plurality of screens are combined, for example, there is a "multi-screen device" disclosed in Japanese Utility Model Laid-Open No. 3-90184.

In this known example, a plurality of screens are provided side by side, and one screen is constructed by inserting the end portions of the screens into the grooves of the screen connection tool (holding tool) located between the adjacent screens. It has become.

Further, in this known example, in order to make the connecting tool inconspicuous, the connecting tool is made of a light diffusing material and its light transmission amount is set to an appropriate value.

[0009]

In the prior art by the prior application of the above-mentioned "multi-screen device", the amount of light transmitted by the connector is adjusted so that the light transmission amount of the connector is approximately the average amount of light at the edges of the adjacent screens. By devising the light transmittance and its shape,
Although the connector is made inconspicuous, there is no mention of consideration for deformation of the screen plane due to humidity and temperature of the screen installation environment.

If the flatness of the screen plane is not maintained properly, the projected image may be distorted and the image quality may be deteriorated, or the screen and the frame may be completely displaced from each other in some cases. there were.

If the frame is made thin so that the depth of the groove for inserting the screen is reduced so as not to get in the way of the image, the above-mentioned situation is likely to occur because the coupling strength between the screen and the frame is further insufficient. It was

If the screen plane is deformed or the screen and the frame are displaced or disengaged, the problem of requiring a great deal of time and effort for reassembly and adjustment at the installation site and the like has been met.

The present invention has been made in view of the above points,
The purpose is to prevent warpage due to temperature and humidity of the screen and maintain appropriate flatness, and even if the depth of the groove for inserting the screen of the frame is made small, the bonding strength between the screen and the frame is An object of the present invention is to provide a multi-vision screen fixing device that is maintained in good condition.

On the other hand, the screen itself spends time in its manufacturing process, the production equipment is expensive, and the screen for multi-vision is about 4 to 5 times higher in external dimension accuracy than a general home projection television. However, the production volume was limited, so the cost was several times higher.

The present invention has been made in view of the above points,
It is an object of the present invention to provide an inexpensive multi-vision screen fixing device constructed by using a screen for a projection television for general household use.

[0016]

In order to achieve the above-mentioned object, a multi-vision screen fixing device according to the present invention has the following objects. (1) A frame is provided with grooves to which the four side edges of the screen abut Lateral direction of the space so that one side of the left and right sides can be detachably attached to another frame with machine screws and a space can be secured at the end of the screen and the bottom of the groove on one side of the frame. The width is set to an arbitrary size by engaging a washer or a spring having an arbitrary thickness.

(2) The screen is configured so that the four sides of the screen are in contact with the frame forming the groove, and the depth of the groove of the lower frame is smaller than the depth of the groove of the upper frame.

(3) Further, a foamed viscoelastic material is attached to the upper and side surfaces of the front frame.

[0019]

[Action]

(1) The width of the space between the frame groove and the frame can be adjusted by arbitrarily selecting the thickness of the screen washer and the compression height of the spring. Even if there is a large amount of dimensional variation, the space can be extended by the amount of the space, so that warping does not occur and the frame is engaged.

(2) Since the screen is inserted into the frame on the lower side by its own weight and is stopped, the depth of the groove is made shallow to reduce the division width of the screen and the groove at the upper side is made deep. It is possible to create a space in the groove, absorb the expansion amount of the screen due to temperature and humidity, and prevent warping.

(3) Even if the frame is warped or a minute gap is formed between the core units, it is blocked by the viscoelastic material, so that the rear light leaks and interferes with the front image. Disappears.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS.

1 to 7 relate to a first embodiment of the present invention,
1 shows a perspective view of multi-vision, and FIG. 2 shows A of FIG.
FIG. 3 shows a sectional view taken along the line A, FIG. 3 shows a sectional view taken along the line BB, FIG. 4 shows a lateral sectional view of a lenticular sheet that constitutes the screen, and FIG. 5 shows the screen. 6 is a vertical cross-sectional view of the lenticular sheet formed from FIG.
Is a schematic diagram showing the warp of the lenticular sheet in the horizontal direction, and FIG. 7 is a schematic diagram showing the warp of the lenticular sheet in the vertical direction.

In each figure, 1 is a core unit, 2
Is a storage rack, 3 is a screen unit, 4 is a frame, 5 is a screen, 6 is a screen stopper, and 7 is a screw.

Reference numeral 10 is a washer, 11 is a lenticular sheet, 12 is a Fresnel lens sheet, 13 is a side spacer, 14 is an upper and lower spacer, 17 is a left and right space, and 20 is an upper and lower space.

In the figure, K1 is the depth of the groove on the left side of the frame 4, and K2 is
Indicates the groove depth of the screen stopper 6, K3 indicates the groove depth of the upper side of the frame 4, and K4 indicates the groove depth of the lower side of the frame 4.

Reference numeral 11a is a convex portion of the lenticular sheet 11, 11b is a concave portion, and 11c is a back surface shape.

In each figure, the multi-vision system includes a screen unit 3, a storage rack 2 and a projection unit (not shown).
Stack multiple core units 1 consisting of
The screens 5 are arranged side by side so that they are arranged.

In the screen unit 3, the screen 5 is locked by a frame 4 having upper and lower sides and a groove on the left side, and a washer 1 is provided by a screen stopper 6 having a groove on the right side.
It is configured to be locked to the other frame 4 with a screw 7 via 0,
Screen 5 has two sheets, lenticular sheet 11
And the Fresnel lens 12 are overlapped, and a space 17 with the groove of the screen stopper 6 is formed in the lateral direction, and the upper frame is formed with a space 20. Depth dimension K1, K2, K3, K4 is K2
The relationship is ≧ K1 and K4 ≧ K3.

Also, upper and lower spacers 14 made of a foam-molded material of viscoelastic material are attached to the upper side of the outer surface of the frame 4 on all sides, and the upper and lower spacers 14 are attached to all sides of the left or right frame. Side spacers 13 made of a foamed material of elastic material are attached to eliminate the gap between the core units 1.

The function of preventing the screen from expanding and warping due to changes in temperature and humidity of the screen unit 3 having the above structure will be described below.

The screen warpage phenomenon is caused by the Fresnel lens 1
The main reason for this is that the thin lenticular sheet 11 expands due to temperature or humidity changes and the expansion is blocked by the screen frame and causes buckling. The cross section of Fig.
When the lenticular sheet 11 expands laterally in response to temperature and humidity changes and the expansion amount is blocked by a frame or the like, as shown in FIG. The fine recess 11 receives the lateral load Px.
Since the b-convex 11a causes the buckling as shown in FIG. 6 and the amount of buckling in the front-rear direction is blocked to some extent by the upper and lower frames, it is conceivable that not only one peak of deformation but also a plurality of peaks.

On the other hand, in the vertical direction, the second moment of area increases due to fine irregularities, and since the length is short at about 4: 3 in the horizontal direction, the amount of expansion due to temperature and humidity changes is relatively small. , The number of mountains in Figure 7 is considered to be less than one,
If there is less than one deformation peak, the distortion appears to be small with respect to the image, and if the gap is the same, the screen will warp from the lateral direction.

With this in mind, the upper and lower spaces 20 of the screen 5 and the frame 4 have a relatively small width S, and the left and right spaces 17 have a large width L so that the expansion of the screen can be expanded by the width of the space 17. Absorb at L to prevent screen warpage.

Further, the amount of temperature change varies depending on the environment of use, and therefore the amount of expansion of the screen 5 also varies, so that the width L of the space 17 can be adjusted by the washer 10 having an arbitrary thickness, so that the machine screw 7 in the lateral direction can be adjusted. Thus, the side surface of the screen 5 is removably inserted into the groove of the screen stopper 6 to be locked.

In the screen unit 3 having the above-mentioned structure,
Specific dimensions of the frame, including variations in the outer dimensions of the screen 5, will be described below.

1. The width dimension that divides the screen 5 by the left frame.

[0038] In the figure, K1 = 2 mm, the groove of the frame 4 is fixed to the screen 5 by spring means or locking means such as adhesion.

2. The width dimension that divides the screen 5 of the screen fitting 6 on the right side.

[0040] In the figure, the size of K2 = 4mm is ±
Even if there is a 1.5 mm variation, it has a space 17 and is locked in the groove of the metal fitting 6.

3. The width b1 that divides the screen by the frame is 1.5 mm in the gap between the core units, and the expansion due to temperature and humidity causes the washer to be formed by spring means when the screen varies to the maximum size.
If the frame is elastically deformed even when expanded by mm,

[0042]

[Formula 1] b1 = 2.6 + 4.6 + 0.5 = 7.7 (mm), which means that the width can be reduced.

4. 4. The width by which the screen 5 is divided by the lower frame is the same as that of the upper frame and is 2.6 mm. 5. The width by which the screen 5 is divided by the upper frame is 4.6 mm, which is the same as the width by which the screen 5 on the right side is divided. The width b2 of the screen band by the vertical frame of the frame
Is

[0044]

[Formula 2] b2 = 2.6 + 4.6 + 0.5 = 7.7 (mm), which is a small joint width.

Next, an explanation will be given of the operation of the above-described structure, in which the screen frame is curved and the gap between the core units in the stacked state is protected from light.

Since side surface spacers and upper and lower spacers 14 made of a foamed viscoelastic material are provided on the upper and side sides of the frame 4, a video image is displayed between core units which are in a stacked state as shown in FIGS. There is no gap when viewed from the direction, and the light source from the back direction can be illuminated.

Next, FIGS. 8 and 9 relate to a second embodiment of the present invention, FIG. 8 is an enlarged view of a portion C of FIG. 1, and FIG. 9 is a sectional view taken along the line D-D of FIG.

In each drawing, the same parts as those in the previous drawings are designated by the same reference numerals, and the others 31 are springs.

In this embodiment, the width of the space 20 can be adjusted by rotating the screw 7 in the direction of the arrow (e) in the figure, so that the first embodiment can be easily expanded by temperature and humidity and the outer dimensions of the screen. This is an example that can be locked by the screen fixing metal even if there are variations.

[0050]

As described above, according to the present invention, the warp of the lenticular sheet due to temperature and humidity can be prevented, and the projection light from the projection unit can be received by the lenticular sheet at a fixed position, so that the image distortion Is significantly reduced, which has the effect of significantly improving the appearance of the image.

When the screen is not displaying an image, the warp of the lenticular sheet is particularly noticeable and unsightly. By preventing the warp, the design value is significantly improved.

Even if the outer dimensions of the screen vary, the screen can be locked by the frame, so that an inexpensive screen can be used, and the manufacturing cost of the screen unit portion can be significantly reduced.

Since the gap between the core units can be eliminated, there is an effect that the image from the rear light source is not disturbed and the appearance of the image is significantly improved.

[Brief description of drawings]

FIG. 1 is a perspective view of the appearance of multi-vision according to the first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is a cross-sectional view taken along the line BB of FIG.

FIG. 4 is a lateral cross-sectional view of the lenticular sheet 11.

5 is a vertical cross-sectional view of the lenticular sheet 11. FIG.

FIG. 6 is a schematic diagram showing the lateral warpage of a lenticular sheet.

FIG. 7 is a schematic view showing a vertical warp of a lenticular sheet.

8 is a front view of the enlarged view screen unit 1 of the portion C in FIG. 1 according to the second embodiment of the present invention. FIG.

9 is a cross-sectional view taken along line D-D of FIG. 8, showing an external perspective view of a screen unit according to a second embodiment of the present invention.

[Explanation of symbols]

 1 ... Core unit, 2 ... Storage rack, 3 ... Screen unit, 4 ... Frame, 5 ... Screen, 6 ... Screen stopper, 7 ... Screw, 10 ... Washer, 11 ... Lenticular sheet, 12 ... Fresnel lens sheet, 13 ... Side spacers, 14 ... Upper and lower spacers, 17, 20 ... Space, 31 ... Spring.

Claims (3)

[Claims] 1. A projection unit having a projection unit made of a projection type cathode ray tube, and an optical means such as a reflecting mirror or a lens for guiding the projection light from the projection unit to a screen, and the projection light of the projection unit. A core unit composed of a screen unit formed of a screen and a screen frame for displaying the image, and a storage rack for locking the projection unit and the screen unit to a fixed value to block light.
In a multi-vision system in which a large screen is formed by stacking vertically and horizontally, a four-sided outer circumference of the screen is provided with a screen frame (grooves are abbreviated as a frame below). ), A lenticular sheet made of a substantially transparent material having an uneven cross-section with the up-down direction as the longitudinal direction is arranged on the front surface, and the screen is centered on the rear surface. And a structure in which Fresnel lens sheets made of a substantially transparent material having a concentric circular concave and convex cross section are stacked, and the frame forming one side of the four sides of the frame is formed by the thickness of the washer or the like from the other frame. A space securing means, or a means for adjusting the thickness of the space such as a coil spring, to secure a space of any depth in the end of the screen and the groove of the frame, Multivision screen fixing device, characterized in that engaged in removable means such 械 screws. 2. A projection unit having a projection unit composed of a projection type cathode ray tube and an optical means composed of a reflecting mirror or a lens for guiding the projection light from the projection unit to a screen, and the projection light of the projection unit. A multi-vision system that forms a large screen by stacking vertically and horizontally a core unit, which is a combination of a screen unit for displaying In the configuration, the outer periphery of the four sides of the screen is inserted into the groove of the frame provided with the groove having the outer peripheral side of the screen as the longitudinal direction, and A lenticular sheet made of a substantially transparent material with a cross section is placed on the front surface, and a concentric concavo-convex cross section with the screen centered on the rear surface. A multi-vision screen fixing device characterized in that the Fresnel lens sheet made of a substantially transparent material having . 3. The multi-vision system according to claim 1, wherein the foamed viscoelastic material having a thin wall is attached to the entire upper surface of the frame and the entire one side surface of the frame. Screen fixing device.