JPH06289490A - Screen device - Google Patents

Abstract

PURPOSE:To draw a light reflection surface having required aspect ratio to the same position with a simple constitution by housing plural screens and drawing a required screen to the same position by means of a drawing position controlling means. CONSTITUTION:The screen 4 whose aspect ratio is 4:3 is fixed on a turnable take-up shaft 2 in a housing case 1, the upper end of the screen 5 whose aspect ratio is 16:9 is fixed on the other take-up shaft 3, a pair of front and rear drawing position controlling rollers 7a and 7b is arranged in the vicinity of the drawing hole 6 on the central part of the bottom of the housing case 1. As to the screens 4 and 5; a take-up shaft rotating mechanism rotates the take-up shaft 2 or 3, and the screens 4 and 5 are drawn to the same position by the pair of drawing position controlling rollers 7a and 7b, so that distances between the screen 4 and a front projection type television device and between the screen 5 and the front projection type television device are same. Consequently, focusing, and the adjustment for image distortion and misconvergence, etc., on the front projection type television device side are not required in the case of projecting a video having different aspect ratio.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen device used for a front projection type television device, a film projector and the like.

[0002]

2. Description of the Related Art The aspect ratio and projection area of an image projected from a front projection type television device or the like are not constant but vary depending on standards. For example, the aspect ratio of general television broadcasting is 4: 3, and the aspect ratio of high-definition broadcasting is 16: 9. When a screen having different aspect ratios is displayed on a single screen without being lost, there arises inconvenience such as a part not being displayed on the light reflecting surface of the screen.

Therefore, in the past, a screen having the required aspect ratio was obtained by covering a portion where the above-mentioned image is not displayed with a movable dark curtain.

Further, screen devices having different aspect ratios are arranged side by side in front and back, and a screen having a required aspect ratio is pulled out and used.

[0005]

However, in the former case, the structure of the movable dark curtain portion becomes complicated,
It has the disadvantage of high prices. In the latter case, the distance between the screen and a projector such as a front projection type television device cannot be kept constant, so that there is a drawback that adjustment on the projector side is required every time the screen is changed.

Therefore, an object of the present invention is to provide a screen device having a simple screen structure and capable of arranging a required screen and a light reflection surface having an aspect ratio at the same position.

[0007]

In order to achieve the above object, a screen device according to the invention of claim 1 stores a plurality of screens in a storage case, and each of the screens is provided so as to be selectively drawn out. A pull-out position regulating means for pulling out the screens to the same position is provided.

Further, in the screen device according to the inventions of claims 2 and 3, a switching roller is provided in the storage case, and one end of the endless screen pulled out of the storage case is provided to the switching roller. A plurality of light-reflecting surfaces having different aspect ratios, inch sizes, etc. are formed on the screen, and the screen is moved in an endless track by the rotation of the switching roller.

A screen device according to a fourth aspect of the invention is
An endless screen is hung on a pair of switching rollers, and a plurality of light reflecting surfaces having different aspect ratios, inch sizes, etc. are formed on this screen, and the screen draws an endless track by the rotation of the pair of switching rollers. It is configured to move.

[0010]

According to the first aspect of the invention, the required screen can be pulled out to the same position by the pulling-out position regulating means, and since a plurality of screens are used, the movable structure can be simplified.

According to the inventions of claims 2 to 4, since the light reflecting surface having a required aspect ratio is obtained by moving the screen at the infinite end, the light reflecting surfaces can be positioned at the same position. Moreover, since the screen at the infinite end is used, the movable structure can be simplified.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the present invention. FIG. 2 shows a schematic configuration diagram of the screen device A. In FIG.
Two screen take-up shafts 2 and 3 are rotatably provided in the storage case 1. A screen 4 having an aspect ratio of 4: 3 is provided on one screen take-up shaft 2 and the other screen take-up shaft 3 is provided. The upper ends of the screens 5 each having an aspect ratio of 16: 9 are fixed to. A screen draw-out hole 6 is formed in the center of the bottom surface of the storage case 1, and a pair of front and rear draw-out position restricting rollers 7a and 7b, which are draw-out position restricting means, are arranged near the screen draw-out hole 6.

The lower ends of the two screens 4 and 5 are guided below the screen draw-out hole 6 through a pair of withdrawing position regulating rollers 7a and 7b, and the pair of withdrawing position regulating rollers 7a and 7b are It is arranged through a minute gap. 2 located below the screen drawing hole 6
Stoppers 8 and 9 are provided at the lower ends of the screens 4 and 5, respectively.
Are provided respectively so that the lower ends of the screens 4 and 5 do not enter the inside of the screen drawing hole 6.

A take-up shaft rotating mechanism (not shown) selectively applies a rotating force to the screen take-up shafts 2 and 3.
It is configured so that the rotational force can be applied manually or automatically.

In the above structure, when viewing an image with an aspect ratio of 4: 3, the screen winding shaft 2 is rotated clockwise by the winding shaft rotating mechanism. Then, Fig. 1 (a)
As shown in FIG. 3, the screen 4 having an aspect ratio of 4: 3 is pulled out to obtain a projection state as shown in FIG.

From this state, the aspect ratio is 16: 9.
When viewing the image, the screen winding shaft 2 is first rotated counterclockwise by the winding shaft rotating mechanism, and the screen 4 having an aspect ratio of 4: 3 is housed as shown in FIG.
Next, the screen winding shaft 3 is rotated clockwise by the winding shaft rotating mechanism. Then, as shown in FIG. 1B, the screen 5 having an aspect ratio of 16: 9 is pulled out, and a projection state as shown in FIG. 4 is obtained. In FIGS. 3 and 4, reference numeral 10a is a light reflecting surface that displays an image, and 10b is a light absorbing surface that does not display an image.

Since both of the screens 4 and 5 are pulled out to the same position by the pair of pulling-out position regulating rollers 7a and 7b, the distances L between the screens 4 and 5 and the front projection type television apparatus B are the same. . Therefore, even when images with different aspect ratios are projected, it is not necessary to adjust the focus, screen distortion, misconvergence, etc. on the front projection television apparatus B side. Moreover, since the screens 4 and 5 to be housed have a simple rectangular shape, the movable structure is simple.

In the first embodiment, the case where two screens 4 and 5 are stored is shown, but it is also possible to store three or more screens. In addition, in the first embodiment, the case where two screens 4 and 5 having different aspect ratios are stored is shown. However, the case where the screens have the same aspect ratio and the light reflection surface 10a has a different area (inch size) or light You may comprise so that the material of the reflective material (screen gain) of the reflective surface 10a may differ.

5 to 10 show a second embodiment of the present invention. FIG. 5 shows a schematic configuration diagram of the screen device A. Figure 5
In the storage case 1, a storage roller 11 is rotatably disposed, and a switching roller 12 and a slip prevention roller 13 supported by the storage roller 11 are rotatably disposed in the storage roller 11. Has been done. Therefore, when the storage roller 11 rotates, the switching roller 12 and the slip prevention roller 13 also rotate with it. However, it does not rotate. The switching roller 12 and the slip prevention roller 13 are pressed against each other via a screen 14.

The screen 14 has an endless loop shape, one end of which is hooked on the switching roller 12 and the other end of which passes through the outer peripheral opening 11a of the storage roller 11 and the screen drawing hole 6 of the storage case 1. It is pulled out downward. The weight 15 roller 15 is hung on the other end of the screen 14 pulled out downward, and the screen 14 is pulled downward by the weight of the weight roller 15. A light reflecting surface 16a (shown in FIG. 8) having an aspect ratio of 16: 9 and a light reflecting surface 16b (shown in FIG. 8) having an aspect ratio of 4: 3 are formed on the surface of the screen 14. The other part of the surface of the screen 14 is formed by the light absorbing surface 16c.

In the above structure, when the aspect ratio is 16: 9 and the aspect ratio is 4: 3 as shown in FIG. 8, the switching roller 12 is rotated in the direction of arrow a in FIG. It should be noted that this rotation may be performed by the rotational force of the motor or manually. Then, the screen 14 receives a large frictional force by the anti-slip roller 13 and moves in the direction of arrow b in FIG. 5 without slipping.
FIG. 9 shows a state in the middle of switching, further moving from this state and stopping in the state of the aspect ratio 4: 3 shown in FIG. From the state of the aspect ratio of 4: 3 shown in FIG.
The aspect ratio of 16: 9 can be similarly switched to the state.

Further, when the screen 14 is stored in the drawing position shown in FIG. 5, the storage roller 11 is rotated in the direction of arrow c in FIG. Incidentally, this rotation may be performed by the rotational force of the motor or manually. Then, the switching roller 12 and the slip prevention roller 13 also rotate around the rotation axis of the storage roller 11, and the screen 14 is wound around the storage roller 11 as shown in FIG. Then, by stopping the rotation of the storage roller 11 when the screen 14 is almost completely wound, the storage position shown in FIG. 7 is obtained. The displacement from the storage position shown in FIG. 7 to the withdrawal position shown in FIG. 5 can be similarly performed by rotating the storage roller 11 in the opposite direction.

11 and 12 show a third embodiment of the present invention. FIG. 11 is a schematic side view of the screen device A, and FIG.
Shows respective schematic front views. In FIG. 11 and FIG. 12, a pair of left and right side frame members 1 is provided at both ends of the upper frame member 17.
Both ends of 8 are fixed, and the upper frame 17 is attached to, for example, the ceiling.

Switching rollers 19 and 20 are rotatably installed between the upper and lower ends of the pair of left and right side frames 18, and at least one of the switching rollers 19 and 20 is rotated by a motor. It is configured to be manually rotatable.

The screen 14 has an endless loop shape, and is applied between the pair of switching rollers 19 and 20 with a constant tension. A light reflection surface 16a (shown in FIG. 12) having an aspect ratio of 16: 9 and a light reflection surface (not shown) having an aspect ratio of 4: 3 are formed on the surface of the screen 14. The other part of the surface of the screen 14 is formed by the light absorbing surface 16c.

Also in the third embodiment, the aspect ratio of the screen 14 can be switched in the same manner as in the second embodiment. However, the screen 14 cannot be housed as in the second embodiment.

In the second and third embodiments, the screen 14 has two light reflecting surfaces 16 having different aspect ratios.
Although a and 16b are configured, three or more light reflecting surfaces may be configured. In addition, materials with the same aspect ratio but different area (inch size) and the material of the reflective material (screen gain)
A plurality of reflecting surfaces different from each other may be configured.

In the above first to third embodiments,
Although the screen device A having a structure that is hung from the ceiling or the like has been shown, the present invention can be similarly applied to a screen device having a structure that is installed on the floor surface or the like to lift the screen.

[0029]

As described above, according to the present invention of claim 1, since a plurality of screens are accommodated and the pull-out position regulating means for pulling out the respective screens to the same position is provided, the respective screens are located at the same position. By pulling it out, the distance between the screen and the projector is always constant, so there is no need for adjustment on the projector side.
Since the structure is pulled out, the movable structure is simple and the cost can be reduced.

Further, according to the inventions of claims 2 to 4, since a plurality of different light reflecting surfaces are formed on the screen at the infinite end and the screen can be moved in an endless track, each light reflecting surface is Since it is located at the same position and the distance between the light reflecting surface and the projector is always constant, there is an effect that no adjustment is required on the projector side. Further, according to the third aspect, since the screen is housed and pulled out only by rotating the housing roller, there is an effect that the movable structure is simple and the cost can be reduced.

[Brief description of drawings]

1A is a schematic configuration diagram of a screen device in a state where a screen having an aspect ratio of 4: 3 is drawn out, and FIG. 1B is a schematic configuration diagram of a screen device in a state where a screen having an aspect ratio of 16: 9 is drawn out; Example 1).

FIG. 2 is a schematic configuration diagram of a screen device in a state where both screens are housed (first embodiment).

FIG. 3 is a perspective view showing a projected state of an image having an aspect ratio of 4: 3 (first embodiment).

FIG. 4 is a perspective view showing a projected state of an image having an aspect ratio of 16: 9 (first embodiment).

FIG. 5 is a schematic configuration diagram of a screen device in a drawing position (second embodiment).

FIG. 6 is a schematic configuration diagram of a screen device during storage (second
Example).

FIG. 7 is a schematic configuration diagram of the screen device in the storage position (second
Example).

FIG. 8 is a front view of a screen device showing an aspect ratio of 16: 9 (second embodiment).

FIG. 9 is a front view of a screen device showing an aspect ratio conversion process (second embodiment).

FIG. 10 is a front view of the screen device showing an aspect ratio of 4: 3 (second embodiment).

FIG. 11 is a schematic side view of a screen device (third embodiment).

FIG. 12 is a schematic front view of a screen device (third embodiment).

[Explanation of symbols]

A ... Screen device 1 ... Storage case 4, 5, 14 ... Screen 7a, 7b ... Draw-out position regulating roller (draw-out position regulating means) 11 ... Storage roller 11a ... Outer peripheral opening 12, 19, 20 ... Switching roller 10a, 16a, 16b ... Light reflecting surface

Claims (4)

[Claims] 1. A screen device comprising a plurality of screens housed in a storage case, each of which is provided so as to be selectively withdrawn, and withdrawing position regulating means for withdrawing each of the screens at the same position. . 2. A switching roller is provided in the storage case, one end of an infinite end screen drawn out of the storage case is hung on the switching roller, and a plurality of screens having different aspect ratios, inch sizes, etc. are attached to the screen. A screen device comprising a light-reflecting surface, wherein the screen is moved in an endless track by the rotation of the switching roller. 3. A storage roller is provided in the storage case, the switching roller is arranged in the storage roller, and the screen is pulled out from an outer peripheral opening of the storage roller to rotate the storage roller. 3. The screen device according to claim 2, wherein the screen is provided in the storage case so that it can be stored and drawn out freely. 4. A screen at an infinite end is hung on a pair of switching rollers, a plurality of light reflecting surfaces having different aspect ratios, inch sizes, etc. are formed on the screen, and the screen is rotated by the rotation of the pair of switching rollers. A screen device characterized by being configured to move along an endless track.