JP3251438B2 - Multi vision - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

This invention relates to multi-vision.

[0002]

2. Description of the Related Art Conventionally, a multi-vision configuration used in a lease or the like is often used for an event or the like, and is frequently installed and removed, so that a unit screen and a projection unit are housed in one housing. A core unit is formed by stacking a plurality of core units formed on the front surface of the screen and arranging a plurality of core units vertically, horizontally, and vertically. In the multi-vision multi-vision of the core unit stacking system, the stacked core units are lowered for maintenance and maintenance, the maintenance and maintenance inside the core units are performed, and the core units are stacked again. For transport, installation, and removal, the company transports, stacks and unloads in core units. An example of this type of multi-vision is disclosed in
No. 3789 discloses a projection video apparatus and an assembling apparatus.

[0003]

In the above example of the core unit stacking method, it is only necessary to align and screen the screen surface for each core unit and perform the installation, and then unload and remove the core unit for each core unit. It has a feature that it can be done in a short time, and is a convenient structure when installation and removal are frequently performed only by temporary installation used in conventional leasing and the like. However, when performing maintenance and maintenance inside the core unit, such as replacing the screen unit, replacing the projection unit, and adjusting the operation unit of the projection unit while watching the image projected on the screen unit, It is necessary to replace the screen unit and the projection unit, and to adjust the operation unit of the projection unit. Also, if the core unit stacking method is applied directly to a multi-vision system that is always installed, which is used differently, the size of the core unit itself will be large, which will increase the packing volume during transportation, and the installation cost will be limited to one-time installation. However, when comparing the transportation costs, there is a problem that the composition ratio of the transportation costs increases and the costs are high. In addition, if the screen unit and the projection unit, which are always installed in a multi-vision system, are separated and packed, the transportation cost for lease will decrease, but frequent installation and removal will require significant time. There is.

An object of the present invention is to provide a multi-vision having a mechanism that can <br/> in a state in which service and maintenance in the core units are stacked as a multi-vision.

[0005]

Multivision according to the invention To achieve the object] In order to achieve the above object, digits set withdrawal mechanism can be operated from the front surface of the screen unit and the core unit in a frame that locks the screen.

[0006]

The screen unit and the projection unit in the core unit can be protruded forward from the frame .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a multi-vision in a maintenance state showing a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. FIG. 4 is a cross-sectional view of a core unit constituting a multi-vision in a state, FIG. 4 is a schematic view illustrating a mechanical implementation of means for detachably fixing a screen unit and a housing, and FIG. The front view of the mechanism which removes the screen which is a main part is shown.

In each of the figures, reference numeral 101 denotes a multi-vision, 1 denotes a core unit, 2 denotes a housing, 3 denotes a screen unit, 6 denotes a slider unit, 8 denotes a screen, and 10 denotes a frame. Reference numeral 15 denotes a first lever, 16 denotes a second lever, 17 denotes a rotation axis of the first lever, 18 denotes a rotation axis of the second lever, 21
Is a stud provided on the frame 10, 25 is a moving piece provided on the slider unit 6, 26 is a stop piece provided on the slider unit 6, 27 is a long hole provided on the slider unit 6, and 28 is a slider unit 6 The notch provided in the slider unit 30 has a fixing piece 30 provided in the slider unit 6.
1 is a guide roller provided in the slider unit 6;
1 denotes a movable cam provided in the housing, 42 denotes a fixed cam provided in the frame 10, and 51 denotes a tool. 43
Indicates a ball provided on the movable cam 41, 44 indicates a coil spring provided on the movable cam 41, 45 indicates a machine screw provided on the movable cam 41, and 46 indicates a cam provided on the fixed cam 42. And 47 indicates a flathead screw.

In FIG. 1, a schematic configuration of a multivision according to the present invention is formed by aligning the front surfaces of a plurality of core units 1 and stacking them up, down, left, right, up and down, and each core unit 1 includes a projection unit (not shown) and a housing. 2, the screen unit 3 and the slider unit 6, and the screen unit 3 and the projection unit
Is mounted on the housing 2 through the base member and supported so as to be movable in the forward direction.

In FIG. 2 and FIG.
Locks the four sides of the screen 8 with the frame 10, and the frame 10 locks the first lever 15 on the side surface so as to be rotatable about the rotation shaft 17,
The second lever 16 is formed to include a frame 19 with which the arc portion of the second lever 16 abuts, a pair of studs 21, and a fixed cam 42 as a means for attaching and detaching the screen unit 3 and the housing 2. The slider unit 6 is provided with guide rollers 31 on both sides of a fixed piece 30 formed of a long piece member having a substantially C-shaped cross section, and the movable piece 25 is brought into contact with the movable piece 25 via the guide roller 31 so as to be movable left and right in the figure. The moving amount of the moving piece 25 is limited by an elongated hole 27 provided in the moving piece 25 and a stop piece 26 provided in the fixed piece 30, and a notch 28 is associated with the stud 21 provided on a side surface of the frame 10. As a result, the screen unit 3 and the slider unit 6 are engaged with each other, and the fixing piece 30 is fixedly fixed to the housing 2 so that the slider unit 6 is movably fixed to the housing 2. The rotating shaft 1 is attached to the side of the front opening of the housing 2.
The screen unit 3 and the slider unit 6 are fixed to the housing 2 by the combination of the movable cam 41 and the fixed cam 42 by rotatably engaging the second lever 16 via 8.

The operation of pulling out the screen unit 3 from the front of the housing 2 in multi vision will be described.

(1) The moving piece 25 of the slider 6 moves rightward in the drawing, and the fixed cam 42 and the movable cam 41 are connected, so that the screen unit 3 and the housing 2 are connected. (State in FIG. 3) (2) The hatched portion of the first lever 15 is moved rightward in the drawing with the tool 5
1 to rotate the first lever 15 about the rotation shaft 17 in the counterclockwise direction in the figure.

(3) The arc-shaped portion of the first lever 15 pushes the oblique line portion of the second lever 16 backward, and the second lever 16 rotates counterclockwise in the figure around the rotation shaft 18.

(4) The arc portion on the opposite side of the hatched portion of the second lever 16 rotates around the rotation shaft 18 in the front direction in the figure to push the frame portion 19 of the frame forward.

(5) The movable cam 41 and the fixed cam 42 are disengaged from each other, and the moving piece 25 of the slider 6 moves relative to the fixed piece 30 and the screen unit 3 is pushed forward (to the left in the drawing).

(6) Hook the frame 10 of the screen unit 3 and pull the screen unit 3 forward. (7) The stud 21 is removed from the notch 28 of the moving piece 25, and the screen unit 3 is removed from the housing 2.

The storage is performed in the reverse order.

Next, the structure of the movable cam 41 and the fixed cam 42 which connect the screen unit 3 and the slider unit 6 to the housing 2 in a detachable manner will be described.

In FIG. 4, a movable cam 41 is provided by opposing a pair of pairs in which a ball 43 is pressed by a coil spring 44 and a female screw 45, and is movable by inserting a cam portion 44 of a fixed cam 42 between the balls 43. The pair of the cam 41 and the fixed cam 42 are elastically connected in the direction of arrow d in the figure and become detachable, and the pair of the movable cam 41 and the fixed cam 42 is provided in the connecting means of the housing 2 and the screen unit 3.

In FIG. 5, the first lever 15 is rotatably locked to the frame 10 via a rotary shaft 17, and
, It is formed with the same plate thickness as the frame when viewed from the front, so that the width of the non-image band is not increased without disturbing the light beam of the image projected from the projection unit on the screen 8 by the first lever. .

Further, in this embodiment, in order to clarify the operation, the first lever and the second lever are described as being constituted by one function and one component. However, the lever is constituted only by the second lever. Even so, it falls within the scope of the present embodiment.

Next, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 6 is a perspective view of a multi-vision in a maintenance state according to a second embodiment of the present invention, FIG. 7 is a sectional view taken along the line BB of FIG. 6, and FIG. FIG. 3 is a cross-sectional view of a core unit constituting the multivision in the state.

In each of the figures, reference numeral 102 denotes a multi-vision, 61 denotes a core unit, 62 denotes a housing, 63 denotes a screen unit, 70 denotes a frame, and 71 denotes an axis provided on a side surface of the housing 62. 72 denotes a bearing having an open portion provided on the side surface of the frame 70. 75 denotes a first lever, 76 denotes a second lever, 77 denotes a rotation axis of the first lever, 78 denotes a rotation axis of the second lever, and 79 denotes a frame portion provided on a side surface of the frame 70. Is shown.

In FIG. 6, the multi-vision according to the present invention is formed by aligning the front faces of a plurality of core units 61, and stacking them up, down, left, right, up and down. Each core unit 61 includes a projection unit (not shown), a housing 62, The screen unit 63 is formed by the screen unit 63, and the screen unit 3 and the projection unit are supported by the housing 62.

7 and 8, the screen unit 6
3 is a frame in which the four sides of the screen 8 are locked by a frame 70, the frame 70 locks a first lever 75 on the side surface so as to be rotatable about a rotation shaft 77, and an arc portion of the second lever 76 abuts on the side. Part 7
9 and bearing 72, screen unit 63 and housing 6
It is formed with a fixed cam 42 as a second attaching / detaching means.

An open type bearing 72 provided on the side surface of the frame 70 of the screen unit 63 is attached to a shaft 71 provided on the front side surface of the housing 62. Combine. A second lever 76 is rotatably engaged with a side surface of the front opening of the housing 62 via a rotation shaft 78, and the screen unit 63 and the housing 62 are fixed by coupling the movable cam 41 and the fixed cam 42. In the multi-vision having the above configuration, the screen unit 6 is
The operation of removing 3 from the front will be described.

(1) The screen unit 63 and the housing 62 are connected by pushing the screen unit 63 in the counterclockwise direction in the figure and pressing it, and the fixed cam 42 and the movable cam 41 are connected. (State in FIG. 8) (2) The shaded portion of the first lever 75 is moved rightward in FIG.
1 to rotate the first lever 75 counterclockwise in the figure about the rotation shaft 77.

(3) The arc-shaped portion of the first lever 75 pushes the hatched portion of the second lever 76 backward, and the second lever 76 rotates counterclockwise in the figure around the rotation shaft 78.

(4) The arc portion on the opposite side of the hatched portion of the second lever 76 rotates around the rotation shaft 78 in the front direction in the figure to push the frame portion 79 of the frame forward.

(5) The coupling between the movable cam 41 and the fixed cam 42 is released, and the upper part of the screen unit 63 is rotated about the shaft 71 and pushed out. (State of FIG. 7) (6) The user puts his hand on the frame 70 of the screen unit 63 and pulls out the screen unit 63 in a diagonally forward direction.

The storage is performed in the reverse order.

Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 9 is a sectional view of a core unit in a maintenance state showing a third embodiment of the present invention, and FIG. 10 is a sectional view of a core unit constituting a multi-vision in an operating state.

In each of the figures, reference numeral 82 denotes a housing, 83 denotes a screen unit, 80 denotes a frame, 81 denotes a bearing having an opening, 85 denotes a hook, and 87 denotes a rotating shaft of the hook 85. , 88 indicate pins. The general configuration of the multivision according to the present invention is the same as in the first and second embodiments, and therefore will be omitted for simplicity of description.

9 and 10, a screen unit 83 has a hook 85 rotatably locked on a side surface of a frame 80 via a rotary shaft 87, and an open bearing 81 on a side surface of the frame 80.
And a fixed cam 42.

A pin 88 for engaging with a hook 85 provided on the frame 80 is provided on the upper side of the front opening of the housing 82, and the movable cam 41 is fixed to the front opening of the housing 62. The screen unit 83 is detachably engaged with the housing 82 by the fact that the shaft 71 provided on the front side surface of the housing 82 is disengaged from the opening of the bearing 81 and the removable cam 41 and the fixed cam 42 are combined. The operation of removing the screen unit 83 from the front of the housing 82 in this multivision will be described.

(1) A tool 5 having a shape similar to the tip of a flathead screwdriver with the hatched lower part of the hook 75 rightward in the figure.
1 to rotate the hook 75 about the rotation shaft 87 in the counterclockwise direction in the figure.

(2) The hook 75 comes off the pin 88.

(3) The lower part of the screen unit 83 is pushed by hand.

(4) The screen unit 83 rotates about the shaft 71 and pushes the upper part of the frame 80 forward.

(5) The connection between the movable cam 41 and the fixed cam 42 is released, and the upper part of the screen unit 63 is rotated about the shaft 71 and pushed out. (FIG. 9) (6) The user puts his hand on the frame 80 of the screen unit 83 and pulls out the screen unit 83 diagonally forward.

Storage is performed in the reverse order.

Next, FIG. 11 shows a sectional view of the core unit 1 in the maintenance state with the respective screen units 3, 63, 83 removed in the first, second and third embodiments. In FIG. 11, reference numeral 90 denotes a projection unit. Shown, 91 is an operation panel or terminal board, 94 is a rail, 95 is a stand, 96 is a handle,
Reference numeral 97 denotes a roller. In the figure, if the screen units 3, 63, 83 are removed, replacement of the projection unit 90 and adjustment by operation of the operation section of the operation panel 91 can be easily performed from the front.

Next, a fourth embodiment of the present invention will be described with reference to the drawings.

FIG. 12 is a sectional view of a core unit according to a fourth embodiment of the present invention, FIG. 13 is a sectional view of the core unit in a maintenance or adjustment state, and FIG. FIG. 15 is a sectional view showing a state where the projection unit is further pulled out, and FIG. 15 is a front view of the multivision showing a state where the projection unit is replaced.

In each figure, 110 indicates a core unit, 116 indicates a slider unit, 120 indicates a storage rack, 121 indicates a pin, 128 indicates a groove provided in the slider unit, 131 indicates a vertical frame, 132
Is a horizontal frame, 133 is a screen frame, 135
Is a stopper pin, 136 stopper plate, 140 is a holder, 150 is an I-bolt, 151 is a human, 152 is a beam,
153 indicates a rope.

In FIG. 12, the core unit 110 is roughly formed of a storage frame 120, a slider unit 116, a projection unit 90, and a screen unit 3, and the storage frame 120 is an end of a vertical frame 131, a horizontal frame 132, and a screen frame 133. Are fixed by pins 161 or bolts (not shown), respectively.
31 and the screen frame 133 have a guide roller 31 at the lower part. The slider unit 6 is formed of a vertically extending L-shaped portion at the front and a long piece extending rearward from the front, and the L-shaped portion has a notch 28. The screen unit 3 is locked by the slider unit 6 by engaging with the stud 21 provided on the screen unit 3, and the long piece of the slider unit 116 is guided by the guide roller provided on the vertical frame 131 and the screen frame 133. The slider unit 116 is supported by the storage frame 120. The projection unit 90 is mounted on a table 95,
Slider unit 1 via rollers 97 provided in
It is mounted on 16 long pieces.

In FIG. 13, the screen unit 3 is pulled forward from the core unit 110 by the means described in the first embodiment, and the slider unit 116 engaged with the screen unit 3 is pulled forward.
The operation of the operation unit 91 of the projection unit 90 mounted on the camera 16 and the adjustment of the lens focus can be performed while projecting the light beam of the image of the projection unit 90 on the screen unit 3, and can be replaced by pulling out the projection unit 90. .

In FIG. 14, the holder 140 is fixed to the rear surface of the core unit 110, and the projection unit 90 can be pulled out rearward.

In FIG. 15, the top surface I bolt 1 of the projection unit 90 drawn forward or backward in FIGS.
I bolt 1 fixed at the end of the beam 152 with the 50 fixed
Human 15 holding rope by passing rope 15 through hole 50
The projection unit 90 is lowered by the force of 1. The re-installation of the projection unit 90 is performed in the reverse order.

Next, a fifth embodiment of the present invention will be described with reference to the drawings.

FIG. 16 is a perspective view of a packing box in which one core unit is packed according to a fifth embodiment of the present invention. FIG. 17 is a sectional view taken along the line AA of FIG. Shows a perspective view of a state where the core units are stacked, FIG. 19 shows a perspective view of a state where the core units are shortened, and FIG. 20 shows a cross-sectional view when two shortened core units are stored in a packing box. Show.

In these figures, 201 indicates a packing box, 202 indicates a side pad, 203 indicates a cover, 204 indicates a band, 205 indicates a bottom pad, 207 indicates an upper cushion, 208 indicates a lower cushion, 211 indicates a core unit,
212 is a screen unit, 213 is a projection unit,
215 indicates a gantry.

In FIG. 16, the packing box 201 has a side surface formed by side pads 202, a lower part formed by a bottom pad 205, an upper part covered by a lid 203, and a band 204 covering the side pad 202, the bottom pad 205, and the lid 203. It is locked.

In FIG. 17, a core unit 211 includes a screen unit 212, a projection unit 213, and a frame 21.
5, a screen frame 216 and a link 218. At this time, the slider unit 6 shown in the first embodiment and the slider unit 126 shown in the fourth embodiment may be drawn in this embodiment so as to be extendable. The slider unit is omitted to simplify the description of the transportation state, and the slider unit may or may not be included in the scope of the present invention. Further, the link 217 is rotatably locked by a pin 218 at a distance between the frame 215 and the screen frame in the front-rear direction, and the link 217 is separated from the screen frame 216 and rotated to expand and contract.

In FIGS. 16 and 17, the core unit 211 of the multivision for leasing is held as it is, with the upper part being held down by the upper cushion 207, the lower part being supported by the lower cushion 208, and wrapped in a protective sheet (FIG. 16). (Not shown) Surrounded by the side pad 202, the bottom pad 205 and the lid 203, the band 204 ties the side pad 202, the bottom pad 205 and the lid 203, and is packed.

In FIG. 18, the core unit 211 of the multi-vision for lease is unpacked as it is, and the front surface of the screen unit 212 is aligned and stacked vertically and horizontally, and when it is removed, it is similarly unloaded in units of the core unit 211. It is then packed and relocated to another location, which allows for quick installation and removal.

In FIG. 19, the always-installed multi-vision core unit 211 connects the link 217 to the pin 21.
8 around the projection unit 213
The space in the depth direction between the screen unit 212 and the screen unit 212 is almost eliminated.
7. It goes without saying that the dimensional relationship in the depth direction of the screen unit 212 is set to be approximately half or less in a state of being folded in advance.

In FIG. 20, the folded core unit 211 shown in FIG.
2 are stored in the packing box 201 in which one is packed, the upper part is suppressed by the upper cushion 207, the lower part is supported by the lower cushion 208, and the central partition cushion 219
And wrapped in a protective sheet (not shown), surrounded by side pads 202, bottom pads 205 and lid 203,
The side pad 202, the bottom pad 205 and the lid 203 are tied and packed by the band 204.

Next, an application example of the fifth embodiment of the present invention will be described with reference to the drawings.

FIG. 21 is a schematic view of a core unit of an application example of the fifth embodiment viewed from the lateral direction, and FIG. 22 is a schematic view showing a state where the core unit of FIG. 21 is folded.

In each of the figures, 219 indicates a core unit, 220 indicates a foldable stand, 221 indicates a horizontal frame, 222 indicates a rear frame, 223 indicates a center frame, 224 indicates a screen frame, 227 indicates bolts,
28 is a holder, 230 is a rotation axis, and 231 is a slit.

In FIG. 21, a core unit 219 is formed by a screen unit 212, a projection unit 213, and a foldable stand 220. The foldable stand 220 is composed of a horizontal frame 221, a rear frame 222, a center frame 223, a screen frame 224, and a link 217. And each frame 221 to 224 or link 217 is engaged with a pin 218 or bolt 227. The projection unit 213 has a rotating shaft 230, is movably locked by a slit 231 provided in the center frame 223, and has a rear frame 222 and a bolt 22
7 and supported by the gantry 220.

In FIG. 22, when the core unit 219 is unfolded by removing the bolts 227 and rotating the frames 221 to 224 and the links 217 about the pins 218, the left and right dimensions in FIG. / 3
It is as follows.

By transporting in a state where the volume is reduced to 1/3 or less, the packing volume can be further reduced. In the folded state shown in the figure, one or two or three core units 219 may be packed, or the core units 219 may be packed lying down.

[0067]

According to the present invention, the light beam of the image of the projection unit can be projected onto the screen unit from the front side, adjusted, maintained, and maintained, and the screen unit and the projection unit can be replaced from the front side while being stacked as a multi-vision. Therefore, maintainability is greatly improved.

Also, since the multi-vision for lease is packaged with the core unit as it is, the installation and removal can be performed in a short time. In the case of the always-installed multi-vision, the core unit is folded and packed, so that the packing volume is reduced. It can be less than half of the conventional packing volume.

[Brief description of the drawings]

FIG. 1 is a perspective view of a multivision in a maintenance state according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a cross-sectional view of a core unit configuring the multivision in an operating state.

FIG. 4 is an explanatory view illustrating mechanical implementation of a spring or cam means for detachably fixing the screen unit and the housing.

FIG. 5 is a front view of a mechanism for removing a screen, which is a main part of the present invention.

FIG. 6 is a perspective view of a multivision in a maintenance state according to a second embodiment of the present invention.

FIG. 7 is a sectional view taken along the line BB of FIG. 6;

FIG. 8 is a cross-sectional view of a core unit constituting the operating multivision.

FIG. 9 is a sectional view of the core unit in a maintenance state according to the third embodiment of the present invention.

FIG. 10 is a cross-sectional view of a multi-vision core unit in an operating state.

FIG. 11 is a sectional view of the core unit in a maintenance state with the screen unit removed in each embodiment.

FIG. 12 is a sectional view of a core unit according to a fourth embodiment of the present invention.

FIG. 13 is a sectional view of the core unit in a maintenance or adjustment state.

FIG. 14 is a sectional view showing a state where the projection unit is pulled out from the rear surface of the core unit.

FIG. 15 is a front view of the multivision showing a state where the projection unit is replaced.

FIG. 16 is an external perspective view of a packing box in which one core unit of one embodiment of the present invention is packed.

FIG. 17 is a sectional view taken along the line AA of FIG. 1;

FIG. 18 is a perspective view of a state in which core units are stacked.

FIG. 19 is an exemplary perspective view of the appearance of the core unit shown in FIG. 2 in a folded state;

FIG. 20 is a sectional view when two folded core units are stored in a packing box.

FIG. 21 is an explanatory diagram of a core unit according to an application example of the present invention as viewed from a lateral direction.

FIG. 22 is an explanatory view showing a state where the core unit of FIG. 21 is folded.

[Explanation of symbols]

 101: Multi-vision, 2: Housing, 3: Screen unit, 6: Slider unit, 8: Screen, 10: Frame, 15: First lever, 16: Second lever, 17: Rotation axis of first lever Reference numeral 18: rotating shaft of the second lever 21: stud 25: moving piece 26: stop piece 27: elongated hole 28: notch 30: fixed piece 31: guide roller 41: movable cam 42 ... fixed cam.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yukinori Kawamura 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Information & Imaging Products Division, Hitachi, Ltd. (72) Fumihito Ichikawa 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi Image Information System Co., Ltd. (72) Inventor Takuji Ikeda 2-18-18 Toyo, Koto-ku, Tokyo Hitachi Transport System Co., Ltd. (56) References JP-A-6-178241 (JP, A) JP JP-A-6-130495 (JP, A) JP-A-6-75300 (JP, A) JP-A-5-173251 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 21 / 64 G03B 21/58 H04N 5/68 H04N 5/74

Claims (1)

(57) [Claims] 1. A projection unit having a projection unit, an optical unit for guiding projection light from the projection unit to a screen, a screen unit including a screen and a frame for projecting the projection light of the projection unit, and the projection unit And a housing that covers and shields the screen unit from light, and a multi-vision in which a large screen is formed by stacking up and down, left and right, with an integral number of core units, the front of which is arranged on the screen unit. 1
A second attaching / detaching means for the screen unit is provided on the housing, and the first and second attaching / detaching means are operated by an operation from a screen surface side to separate the screen unit and the housing. A multi-vision, which is provided with a detachment mechanism for causing the multi-vision.