JP2010078684A - Screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen that can excellently maintain flatness of a projection surface. <P>SOLUTION: In a pantograph mechanism 5 constituting the screen 1, a first end 511 and a second end 521 in a pair of arms 51 and 52 are turnably coupled to a base body 3, and a third end 531 and a fourth end 541 of a pair of arms 53 and 54 are turnably coupled to an auxiliary support body 4. Guide holes 311 and 41 for moving the first end 511 in a horizontal direction and moving the third end 531 in the horizontal direction by drive of a drive device are respectively provided on the base body 3 and the auxiliary support body 4. An auxiliary guide hole 42 for allowing the fourth end 541 to move to separate from the third end 531 in the horizontal direction from an ordinary position where the fourth end 541 is positioned in such a state that the pair of arms 53 and 54 is not bent is provided on the auxiliary support body 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a screen.

2. Description of the Related Art Conventionally, various screens have been proposed that include a flexible sheet-like screen main body and project image light enlarged and projected from a projector or the like onto a projection surface of the screen main body (see, for example, Patent Document 1). .
In the screen described in Patent Document 1, the upper and lower ends of a sheet-like screen film are supported by a cabinet and a screen film holding part, respectively, and a pantograph mechanism is disposed so as to straddle the cabinet and the screen film holding part.
Here, the pantograph mechanism has two pairs of arm portions that are rotatably connected so as to have an X shape, and is connected to each other in the vertical direction so as to be linked to the other pair of arm portions. Yes.
In addition, one of the upper ends of a pair of arms located on the upper side (hereinafter referred to as the upper telescopic mechanism) is attached to the screen film holder so that it can rotate but cannot be moved horizontally ( The fixed end) and the other are pivotable with respect to the screen film holding part, and are attached so as to be horizontally movable along the slide rail of the screen film holding part (moving end).
Further, a pair of lower arm portions (hereinafter referred to as “lower telescopic mechanism”) are also attached in a state in which one of the lower end portions is rotatable with respect to the cabinet and cannot be moved horizontally. (Fixed end), the other is pivotable with respect to the cabinet, and is attached in a state that allows horizontal movement along the slide rail of the cabinet (moving end).
Then, by operating the gas spring connected to the cabinet and the lower extension mechanism, the lower extension mechanism and the upper extension mechanism are extended, the screen film holder is lifted with respect to the cabinet, and the projection surface of the screen film is It is formed.

Japanese Patent Laid-Open No. 5-34826

However, the technique described in Patent Document 1 has a problem that the flatness of the projection surface cannot be satisfactorily maintained in a state where the projection surface of the screen film is formed by extending the pantograph mechanism (hereinafter referred to as a stretched state).
Here, with reference to FIG. 7, the problem of the conventional configuration will be briefly described. FIG. 7 is an enlarged view of the upper portion of the conventional screen 100 set in the stretched state.
In FIG. 7, the solid line indicates a state where the pair of arm portions 131 and 132 are bent, and the two-dot chain line indicates a state where the pair of arm portions 131 and 132 are not bent.
That is, in the screen 100, as shown in FIG. 7, a pair of arm portions in the upper side expansion / contraction mechanism 130 due to the weight of the screen film 110 and the screen film holding portion 120 and the vertical tension applied to the screen film 110. When the arms 131 and 132 are bent, the upper end 131 </ b> A of the upper expansion / contraction mechanism 130 whose upper end 131 </ b> A is the moving end corresponds to the upper end 131 </ b> A according to the bending of the arm 131. And moves to the right in FIG.
On the other hand, for the arm part 132 whose upper end 132A is a fixed end in the upper telescopic mechanism 130, the upper end 132A cannot move along the slide rail. The screen film holding unit 120 is moved leftward in FIG.
Due to the phenomenon described above, the screen film holding unit 120 is shifted in the horizontal direction with respect to the cabinet. That is, the screen film 110 is also deformed in accordance with the above state, and the flatness of the projection surface cannot be maintained satisfactorily. .

  The objective of this invention is providing the screen which can maintain the flatness of a projection surface favorably.

  The screen of the present invention has a flexible screen main body on which image light is projected, and a base body that extends along a pair of opposed end portions of the screen main body and supports the pair of end portions, respectively. And an auxiliary support, a pantograph mechanism that is disposed across the base body and the auxiliary support, closes and isolates the base body and the auxiliary support, and a drive device that operates the pantograph mechanism, The pantograph mechanism has a pair of arm portions that are rotatably connected so as to have an X shape, and the first end portion and the second end portion on the base body side of the pair of arm portions are connected to the base body. The first end is connected to the auxiliary support so that the third end and the fourth end on the auxiliary support side of the pair of arm portions are rotatably connected to the auxiliary support. And the third end portion is positioned in the same direction with respect to the second end portion and the fourth end portion, respectively, and the base body and the auxiliary support body include the first end portion and the third end portion, respectively. The first end is moved along the extending direction of the base body by driving the driving device, and the third end is moved along the extending direction of the auxiliary support. Guide portions to be moved are respectively formed, and the auxiliary support member is engaged with the fourth end portion, and the pair of arm portions are not bent and the fourth end portion is positioned from a normal position. An auxiliary guide portion is provided that allows the fourth end portion to move in a direction away from the third end portion along the extending direction of the auxiliary support body.

Here, as the guide part or the auxiliary guide part, a guide hole drilled in the base body or the auxiliary support body may be adopted, or a rail protruding from the base body or the auxiliary support body may be adopted. .
Further, the base body and the auxiliary support body are not limited to the structure that supports the upper and lower end portions of the screen body, and may be configured to support the left and right end portions of the screen body.
Hereinafter, in order to simplify the description, it is assumed that the base body supports the lower end portion of the screen body, and the auxiliary support body supports the upper end portion of the screen body.

In the present invention, in the pantograph mechanism, the first end portion moves along the guide portion of the base body by driving of the driving device, whereby the pair of arm portions rotate and expand and contract. The screen is in a stretched state in which the auxiliary support body is pulled up with respect to the base body by expansion and contraction of the pantograph mechanism, and the auxiliary support body is pulled down and the auxiliary support body is close to the base body and can be carried (hereinafter referred to as the screen). Stored state).
Here, in the pantograph mechanism, the second end portion on the base body side functions as a fixed end that cannot move in the horizontal direction with respect to the base body. On the other hand, the first end portion on the base body side, the third end portion on the auxiliary support body side, and the fourth end portion function as moving ends that can move in the horizontal direction along the respective guide portions and auxiliary guide portions. The auxiliary guide portion is provided so that the fourth end portion can be moved in a direction away from the third end portion from a normal position where the fourth end portion is positioned in a state where the pair of arm portions is not bent.

With the above configuration, when the screen is set in a stretched state, even if the pair of arm portions bend due to the weight of the screen body and the auxiliary support, etc., or the tension applied to the screen body, The flatness of the projection surface can be favorably maintained by moving the third end portion and the fourth end portion functioning as the moving ends as shown below.
That is, the third end portion moves in a direction away from the fourth end portion along the guide portion of the auxiliary support body according to the bending of the arm portion.
On the other hand, similarly, since the auxiliary guide portion is formed as described above, the fourth end portion moves along the auxiliary guide portion in a direction away from the third end portion according to the bending of the arm portion.
That is, the guide part and the auxiliary guide part in the auxiliary support body are provided so as to allow the movement of the third end part and the fourth end part due to the bending of the pair of arm parts in the extended state. For this reason, in the stretched state, the upper end portion that functions as a fixed end due to the bending of the arm portion does not shift the auxiliary support body in the horizontal direction as in the conventional case, that is, the screen body is bent or twisted relative to the base body. The auxiliary support can be positioned at a position where no occurrence occurs. Therefore, it is possible to avoid deformation such as bending and twisting of the screen main body, and to maintain the flatness of the projection surface of the screen main body satisfactorily.

  In the screen of the present invention, a plurality of pairs of the arm portions are provided, and the plurality of pairs of arm portions are arranged in a direction in which the base body and the auxiliary support body face each other so as to interlock with the other pair of arm portions. The pair of arms connected to each other and disposed closest to the base body have the first end and the second end, respectively, and are disposed closest to the auxiliary support. Preferably, each of the pair of arm portions has the third end portion and the fourth end portion.

By the way, as a pantograph mechanism, the longer the arm portion, the larger the deflection amount of the arm portion due to the weight of the screen body and the auxiliary support body and the tension applied to the screen body in the extended state. When the amount of bending of the arm portion becomes large in this way, the height position of the auxiliary support body with respect to the base body (the separation position of the auxiliary support body with respect to the base body) in the stretched state is a desired height. It will be positioned at a position lower than the position.
In the present invention, the pantograph mechanism employs a configuration in which a plurality of pairs of arm portions are coupled along the vertical direction (the direction in which the base body and the auxiliary support body face each other) so as to interlock with another pair of arm portions. . Thereby, for example, compared with the case where the pantograph mechanism is configured by a pair of arm portions, the length of the arm portion alone can be shortened by configuring the pantograph mechanism by a plurality of pairs of arm portions. Therefore, in the extended state, the amount of bending of the arm portion can be reduced, and the height position of the auxiliary support body with respect to the base body can be positioned at a desired height position.

In the screen according to the aspect of the invention, the auxiliary support body may include a positioning member that contacts the fourth end portion by moving the fourth end portion in a direction away from the third end portion, and toward the positioning member. Preferably, a biasing member that biases the fourth end portion is provided, and the positioning member is provided so as to be movable along the extending direction of the auxiliary support.
By the way, when the positioning member and the urging member are not provided on the auxiliary support body, the third end portion and the fourth end portion function as moving ends. The position in the extending direction of the support is not mechanically constrained.
Here, for example, if a screen winding part such as a so-called spring roll is employed that automatically winds up the screen body when the pulling force of the screen body is loosened by the urging force of the spring, the base body as shown below The auxiliary support body can be positioned at a desired horizontal position with respect to (the center position of the screen body is positioned at a desired horizontal position with respect to the base body).
That is, in the extended state, the screen body is in a state where tension is applied by the urging force of the screen winding unit. For this reason, the horizontal movement of the auxiliary support is suppressed by the screen body to which tension is applied, and the auxiliary support can be positioned at a desired horizontal position with respect to the base.
However, in the above-described configuration, the horizontal position of the auxiliary support with respect to the base body is not mechanically constrained. Therefore, when the screen is repeatedly used (set to the storage state or the stretched state), the base body is in the stretched state. The auxiliary support may be displaced from the desired horizontal position.

In the present invention, a positioning member and a biasing member are provided on the auxiliary support. Thus, in the extended state, the fourth end can be brought into contact with the positioning member by the biasing force of the biasing member. Further, in this state, if the positioning member that is connected to the auxiliary support body and is in contact with the fourth end portion is moved in the horizontal direction, the fourth end portion or the third end portion is interposed via the auxiliary guide portion or the guide portion. The auxiliary support can be moved in the horizontal direction relative to the part. Therefore, even when the auxiliary support is displaced from the desired horizontal position with respect to the base body in the extended state, the auxiliary support can be positioned at the desired horizontal position with respect to the base body.
In particular, when a plurality of screens are manufactured, the amount of deflection of the pair of arm portions in the stretched state is likely to vary among the individual screens due to manufacturing variations. That is, the horizontal position of the auxiliary support with respect to the base body tends to vary in the stretched state on each screen. Therefore, by providing the positioning member and the biasing member on the auxiliary support body as described above, the auxiliary support body can be finely adjusted in the horizontal direction in all manufactured screens, and the desired horizontal position with respect to the base body can be obtained. An auxiliary support can be positioned.
In addition, once the position of the positioning member is adjusted, the fourth end can always be brought into contact with the positioning member by the biasing force of the biasing member in the expanded state. That is, since the fourth end portion can be brought into contact with the positioning member whose position has been adjusted before, the auxiliary support body can be positioned at a desired horizontal position with respect to the previously set base body.

In the screen according to the aspect of the invention, it is preferable that the base body supports a lower end portion of the screen body, and the auxiliary support body supports an upper end portion of the screen body.
By the way, for example, the base body and the auxiliary support body are configured to support the left and right end portions of the screen body, respectively, and the screen winding unit described above is further employed. Even in such a configuration, depending on the strength of the tension applied to the screen body by the spring roll and the rigidity of the arm portion, the pair of arm portions may bend in the extended state. The same applies to a configuration in which the base body is installed on the ceiling or the like and the screen body is suspended from the ceiling toward the floor surface. However, rather than the case of the above configuration, the support structure of the screen body by the base body and the auxiliary support body as in the present invention, that is, the influence of the weight of the screen such as the screen body is more affected by the pair of arm portions. Are likely to be bent.
Therefore, according to the present invention, the effect of preventing the horizontal movement of the auxiliary support with respect to the base body due to the bending of the pair of arm portions described above and maintaining the flatness of the projection surface of the screen body can be suitably achieved. .

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Schematic configuration of screen]
FIG. 1 is a diagram schematically showing a schematic configuration of the screen 1. Specifically, FIG. 1 is a view of the state in which the projection surface is formed as viewed from the back side of the screen body 2.
In FIG. 1, the driving device 6 is omitted for convenience of explanation. The same applies to FIG. 4 below.
In the following, for convenience of explanation, in a state where the projection surface of the screen body 2 is formed, the projection surface side is the front surface, the opposite side to the projection surface is the back surface, the right side when viewed from the back side, the left is “right”, Indicate “left”.
On the screen 1, for example, image light enlarged and projected from a projector or the like is projected. As shown in FIG. 1, the screen 1 has a screen body 2, a base body 3, an upper support 4 as an auxiliary support, a pantograph mechanism 5, a drive device 6 (see FIG. 2), and a position adjustment. And a mechanism 7.

[Configuration of screen body]
The screen body 2 is formed in a flexible sheet shape, and the incident image light is projected thereon. In the present embodiment, the screen body 2 is constituted by a reflective screen that reflects incident image light.

[Configuration of base body]
The base body 3 is a portion that extends along the lower end portion of the screen body 2 having a rectangular shape and supports the lower end portion of the screen body 2. As shown in FIG. 1, the base body 3 includes a base 31 and a spring roll 32 as a screen winding unit.
The base 31 is formed in a box shape having a substantially rectangular parallelepiped shape, and houses a spring roll 32 in a rotatable manner.
In the base 31, a first guide hole 311 as a guide portion extending in the left-right direction is formed on the right side of the back as shown in FIG. 1.

  The spring roll 32 is a member that is rotatable about the left-right direction as a rotation axis and winds up the screen body 2. Although not specifically shown, the spring roll 32 is biased in the winding direction of the screen body 2 by the spring, and has a function of automatically winding the screen body 2 when the pulling force of the screen body 2 is loosened. is doing.

[Configuration of upper support]
The upper support 4 is constituted by a columnar body that extends along the upper end portion of the screen body 2 and has a hollow cross-sectional rectangular shape. The upper support 4 supports the upper end portion of the screen body 2.
In the upper support 4, on the right side of the back surface, as shown in FIG. 1, a second guide hole 41 is formed as a guide portion extending in the left-right direction, like the first guide hole 311 of the base body 3. Has been.
In the upper support 4, an auxiliary guide hole serving as an auxiliary guide portion extending in the left-right direction around a normal position P <b> 4 (see FIG. 4), which will be described later, has a shorter length than the second guide hole 41 on the left side of the back surface. 42 is formed.

[Configuration of pantograph mechanism]
The pantograph mechanism 5 is disposed across the back surfaces of the base body 3 and the upper support body 4, and is a mechanism for moving the upper support body 4 up and down relative to the base body 3.
As shown in FIG. 1, the pantograph mechanism 5 includes a lower expansion / contraction mechanism 50A disposed on the base body 3 side and an upper expansion / contraction mechanism 50B disposed on the upper support 4 side.
The lower expansion / contraction mechanism 50A has a pair of first arm portions 51 and a second arm portion that have substantially the same length dimension and are pivotally connected to each other through a fulcrum 5A so as to have an X shape. It has an arm part 52.

In the downward extending / contracting mechanism 50A, the lower end portion (first end portion) 511 of the first arm portion 51 is opposed to the lower end portion (second end portion) 521 of the second arm portion 52, as shown in FIG. A first sliding member 511A that is located on the right side and moves along the first guide hole 311 and a fulcrum 5C that rotatably connects the first arm portion 51 to the first sliding member 511A.
The first sliding member 511A is formed in a substantially rectangular parallelepiped block shape, and the first arm portion 51 is connected to the back surface via a fulcrum 5C.
Further, the first sliding member 511A has a protruding portion 511B (see FIG. 2) that protrudes into the base 31 via the first guide hole 311 on the front surface.
Although not specifically shown, the protruding portion 511 </ b> B is formed with a screw hole that penetrates in the left-right direction and engages with a screw shaft 62 (described later) of the driving device 6.

On the other hand, the second end portion 521 of the second arm portion 52 has a fulcrum 5D as shown in FIG. 1, and the fulcrum 5A is positioned on the vertical axis passing through the center position O of the screen body 2. It is connected to the back surface of the body 3 through a fulcrum 5D so as to be rotatable.
That is, unlike the first end 511 that functions as a moving end that can move in the left-right direction, the second end 521 functions as a fixed end that cannot move in the left-right direction.

The upper telescopic mechanism 50B has a structure substantially similar to that of the lower telescopic mechanism 50A, and has a pair of third arm portions that are pivotally connected to each other through a fulcrum 5B so as to have an X shape. 53 and a fourth arm portion 54.
In the upper telescopic mechanism 50B, the upper end portion (third end portion) 531 of the third arm portion 53 is relative to the upper end portion (fourth end portion) 541 of the fourth arm portion 54 as shown in FIG. It has a third sliding member 531A that is located on the right side and moves along the second guide hole 41, and a fulcrum 5E that rotatably connects the third arm portion 53 to the third sliding member 531A.
The third sliding member 531A is formed in a substantially rectangular parallelepiped block shape, and the third arm portion 53 is connected to the back surface via a fulcrum 5E.
In addition, the third sliding member 531A is not specifically shown, but is provided with a substantially T-shaped projecting portion projecting into the upper support 4 through the second guide hole 41 on the front surface. . That is, the third sliding member 531A engages with the second guide hole 41 by sandwiching the peripheral edge portion of the second guide hole 41 with the protruding portion.

On the other hand, as shown in FIG. 1, the fourth end portion 541 of the fourth arm portion 54 is fourth with respect to the fourth sliding member 541A moving along the auxiliary guide hole 42 and the fourth sliding member 541A. And a fulcrum 5F that rotatably connects the arm portion 54.
The fourth sliding member 541A has the same shape as the fourth sliding member 531A, and the fourth arm portion 54 is connected to the back surface via a fulcrum 5F.
That is, the third end portion 531 and the fourth end portion 541 function as moving ends that can move in the left-right direction.

As shown in FIG. 1, the lower extension mechanism 50 </ b> A and the upper extension mechanism 50 </ b> B described above are configured such that the upper ends 512 and 522 of the arm portions 51 and 52 are connected to the arm portions 53 and 5H via the fulcrums 5 </ b> G and 5 </ b> H, respectively. The lower end portions 532 and 542 are connected to each other in a rotatable manner.
That is, the pantograph mechanism 5 is interlocked with the rotation about the fulcrum 5A in each arm 51, 52 (the lower expansion / contraction mechanism 50A expands / contracts in the vertical direction), and each arm 53, 54 centers on the fulcrum 5B Is rotated (the upper side expansion / contraction mechanism 50B expands / contracts in the vertical direction) and expands / contracts in the vertical direction.
The screen 1 is in a state in which the upper support 4 is pulled up to a predetermined height position with respect to the base body 3 by the expansion and contraction of the pantograph mechanism 5 to form a projection surface of the screen body 2 (hereinafter, a stretched state). And the upper support body 4 is pulled down with respect to the base body 3, and the base body 3 and the upper support body 4 are set close to each other and can be carried (hereinafter referred to as a storage state).

[Configuration of drive unit]
FIG. 2 is a diagram for explaining the configuration of the driving device 6. Specifically, FIG. 2 is an enlarged view of a lower right portion of the screen 1 shown in FIG.
In FIG. 2, the illustration of the spring roll 32 is omitted for convenience of explanation.
As shown in FIG. 2, the drive device 6 is a device that is disposed inside the base 31 (on the back side of the spring roll 32) and operates (expands and contracts) the pantograph mechanism 5. As shown in FIG. 2, the drive device 6 includes a motor 61 and a screw shaft 62.

The motor 61 is constituted by a so-called electric motor that converts electrical energy into mechanical rotational energy, and is arranged such that a rotating shaft (not shown) extends along the extending direction (left-right direction) of the base body 3.
As shown in FIG. 2, the screw shaft 62 has a cylindrical shape with a thread groove formed on the outer periphery, one end connected to the rotation shaft of the motor 61, and the other end on the first end 511 (first sliding). The member 511A) is screwed into the screw hole of the protruding portion 511B. The screw shaft 62 is rotated about the columnar columnar shaft by driving the motor 61.
In other words, the driving device 6 changes the screwed state between the screw shaft 62 and the protruding portion 511B by driving the motor 61 (rotation of the screw shaft 62), and the first sliding member 511A (the first sliding member 511A) 1 end 511) is moved in the left-right direction. Then, the driving device 6 expands and contracts the pantograph mechanism 5 by moving the first sliding member 511A in the left-right direction.
The protrusion 511 </ b> B and the screw shaft 62 are not specifically illustrated, but are coupled via a ball that rolls in the space between the screw hole of the protrusion 511 </ b> B and the screw shaft 62, and is configured by a so-called ball screw. Yes.

[Configuration of position adjustment mechanism]
FIG. 3 is a view for explaining the configuration of the position adjusting mechanism 7. Specifically, FIG. 3 is an enlarged view of the upper left portion of the screen 1 shown in FIG.
The position adjustment mechanism 7 is a mechanism that adjusts the position (horizontal position) in the left-right direction of the upper support 4 when the screen 1 is set to the extended state. As shown in FIG. 3, the position adjusting mechanism 7 includes an attachment member 71, a positioning member 72, a pair of tension springs 73 as biasing members, and a stopper 74.

The attachment member 71 is a member formed in a substantially rectangular parallelepiped block shape, and is disposed on the back surface of the upper support 4 on the left side of the fourth end portion 541 so as to straddle the auxiliary guide hole 42 vertically. Has been. The attachment member 71 supports the positioning member 72 and the pair of tension springs 73.
The attachment member 71 has a screw hole 711 penetrating in the left-right direction.

The positioning member 72 is a member that contacts the fourth end 541 in the pantograph mechanism 5 and determines the horizontal position of the upper support 4.
In the present embodiment, the positioning member 72 has a bolt shape having a screw head 721 and a screw shaft 722, and is attached to the attachment member 71 by the screw shaft 722 being screwed into the screw hole 711 of the attachment member 71.

  The pair of tension springs 73 are disposed so as to face each other with the positioning member 72 interposed therebetween, and one end is fixed to the right side surface of the mounting member 71 and the other end is fixed to the left side surface of the fourth sliding member 541A. ing. The pair of tension springs 73 urge the fourth end 541 (fourth sliding member 541A) in the left direction (positioning member 72).

The stopper 74 is a member formed in a substantially rectangular parallelepiped block shape, and is disposed on the back surface of the upper support 4 on the right side of the fourth end 541 so as to straddle the auxiliary guide hole 42 vertically. ing.
When the fourth end 541 moves unnecessarily in the right direction, the stopper 74 abuts on the fourth sliding member 541A and restricts the movement of the fourth end 541 in the right direction.
In addition, the adjustment method of the horizontal position of the upper support body 4 by the position adjustment apparatus 7 mentioned above is mentioned later.

[Screen operation]
4 and 5 are views of the operation until the screen 1 is set from the retracted state to the extended state, as viewed from the back side. Specifically, FIG. 4A is a diagram showing the storage state, FIG. 4C is a diagram showing the stretched state, and FIG. 4B is a diagram showing a state between the stored state and the stretched state. It is. FIG. 5 is an enlarged view of the upper side of the screen 1 in the extended state shown in FIG.
In the following description, it is assumed that the position of the screw head 721 is adjusted in advance in the positioning member 72, and the screw head 721 is positioned at the following position.
That is, the screw head 721 contacts the fourth sliding member 541A when the fourth end 541 (fourth sliding member 541A) is positioned at a normal position P4 described later on the auxiliary guide hole 42. Rather, it is positioned at a position where a gap is formed between the fourth sliding member 541A.

In the housed state shown in FIG. 4A, the upper support 4 is pulled down by the contraction of the pantograph mechanism 5, the upper support 4 comes close to the base body 3, and the lower part of the screen body 2 is below the spring roll 32. The side is wound up.
Further, in this stored state, tension is applied to the upper side of the screen body 2 in the vertical direction by the urging force of the spring roll 32. For this reason, the upper support 4 is positioned at a position where the screen body 2 to which the tension is applied is restrained from moving in the left-right direction and the screen body 2 is not bent or twisted (position in the left-right direction).
In this storage state, the fourth end 541 (fulcrum 5F) is located on the auxiliary guide hole 42 at the normal position P4 on the vertical axis passing through the position (fulcrum 5D) of the second end 521 that functions as a fixed end. (FIGS. 4 and 5).
In this storage state, the horizontal movement of the upper support 4 by the screen body 2 to which tension is applied is suppressed, and the fourth end 541 positioned at the normal position P4 and the screw of the positioning member 72 are suppressed. Since a gap is formed between the head 721 and the pair of tension springs 73, as shown in FIG.

In the storage state shown in FIG. 4A, for example, when the user presses an operation switch (not shown) for setting the screen 1 to the extended state, the driving device 6 is driven, and the first end The portion 511 (first sliding member 511A) gradually moves to the left along the screw shaft 62 from the storage position P1 (FIG. 4A) toward the extended position P1 ′ (FIG. 4B).
As shown in FIG. 4B or 4C, the first end 511 gradually moves leftward, that is, the first end 511 gradually moves with respect to the second end 521. By approaching, the pantograph mechanism 5 gradually expands upward against the urging force of the spring roll 32, and the upper support 4 is pulled up with respect to the base body 3.
Then, by positioning the first end 511 at the extended position P1 ′, the projection surface of the screen body 2 is formed as shown in FIG. 4C, and the screen 1 is set in the extended state.

By the way, in the extended state shown in FIG. 4C, the third arm portion 53 and the fourth arm as shown in FIG. 5 due to the weight of the screen body 2 and the upper support 4 and the urging force of the spring roll 32. The part 54 is easy to bend.
In FIG. 5, the alternate long and two short dashes line indicates the state of the screen 1 when the arm portions 53 and 54 are not bent, and the solid line indicates the state of the screen 1 when the arm portions 53 and 54 are bent. Yes.

Here, since the third end portion 531 functions as a moving end as described above, when the third arm portion 53 is bent, the third end portion 531 is changed according to the bending of the third arm portion 53 as shown in FIG. 2 Move to the right along the guide hole 41.
Similarly, since the fourth end portion 541 functions as a moving end as described above, when the fourth arm portion 54 is bent, as shown in FIG. 5, according to the bending of the fourth arm portion 54. It moves to the left along the auxiliary guide hole 42.
That is, the auxiliary guide hole 42 is provided so that the fourth end portion 541 can be moved in the left direction from the normal position P4 where the fourth end portion 541 is positioned in a state where the fourth arm portion 54 is not bent.
Then, due to the urging force of the pair of tension springs 73, the left side surface of the fourth sliding member 541 </ b> A contacts the screw head 721 of the positioning member 72.

  Note that when the state shown in FIG. 4C is changed to the state shown in FIGS. 4B and 4A, for example, an operation switch for setting the screen 1 to the storage state by the user ( By depressing (not shown), the driving device 6 is driven, and the pantograph mechanism 5 operates in the reverse direction to the above, and the screen 1 is set in the housed state.

[How to adjust the horizontal position]
FIG. 6 is a view for explaining a method for adjusting the horizontal position of the upper support 4 by the position adjusting mechanism 7.
Specifically, FIG. 6 is an enlarged view of the upper left portion of FIG.
After the screen 1 is set to the extended state shown in FIG. 5, when the positioning member 72 is rotated and the screw head 721 is moved in the left-right direction, the horizontal position of the upper support 4 is adjusted as described below.
That is, when the positioning member 72 is rotated from the state shown in FIG. 6A and the screw head 721 is moved in the right direction, the positioning member 72 presses the fourth end portion 541 in the right direction. As shown in B), the upper support 4 moves to the left with respect to the fourth end 541 and the third end 531.
6B, when the positioning member 72 is rotated and the screw head 721 is moved leftward, the pair of tension springs 73 bias the fourth end portion 541 toward the positioning member 72. Therefore, as shown in FIG. 6A, the upper support 4 moves in the right direction with respect to the fourth end 541 and the third end 531.
As described above, the horizontal position of the upper support 4 is finely adjusted by moving the positioning member 72 in the left-right direction.

According to this embodiment described above, the following effects are obtained.
In the present embodiment, in the screen 1, the pantograph mechanism 5 has a second end 521 that is connected to the base body 3 functions as a fixed end, and is connected to the first end 511 that is connected to the base body 3 and the upper support 4. The third end portion 531 and the fourth end portion 541 that function as the moving end. Further, the upper support 4 is formed with a second guide hole 41 and an auxiliary guide hole 42 that allow movement of the third end portion 531 and the fourth end portion 541 due to the bending of the pair of arm portions 53 and 54 in the extended state. Has been.
With the above configuration, in the stretched state, the upper end portion that functions as a fixed end by the bending of the arm portion does not shift the upper support 4 in the left-right direction as in the prior art. The upper support 4 can be positioned at a position where no bending or twisting occurs in 2. Therefore, deformation such as bending or twisting of the screen body 2 can be avoided, and the flatness of the projection surface of the screen body 2 can be maintained well.

  The pantograph mechanism 5 includes a lower expansion / contraction mechanism 50A and an upper expansion / contraction mechanism 50B, and includes two pairs of arm portions 51 and 52 (53 and 54). Thereby, for example, compared with a case where the pantograph mechanism is composed of a pair of arm portions, the arm portions 51 to 54 are provided as a single unit by having two pairs of arm portions 51 and 52 (53, 54). Can be shortened. Therefore, in the extended state, the bending amount of the pair of arm portions 53 and 54 can be reduced, and the height position of the upper support 4 with respect to the base body 3 can be positioned at a desired height position. .

Further, the upper support 4 is provided with a positioning member 72 and a pair of tension springs 73. Thereby, for example, even when the screen 1 is repeatedly used (set to the storage state or the extended state) and the upper support 4 is displaced from a desired horizontal position with respect to the base body 3 in the extended state, The upper support 4 can be positioned at a desired horizontal position with respect to the base body 3 by moving the screw head 721 (positioning member 72) in contact with the fourth end 541 in the left-right direction.
In particular, in the manufactured plurality of screens 1, even when the horizontal position of the upper support 4 with respect to the base body 3 varies due to manufacturing variations, the positioning member 72 and the pair of pairs are disposed on the upper support 4. By providing the tension spring 73, the upper support 4 can be finely adjusted in the left-right direction in all manufactured screens 1, and the upper support 4 can be positioned at a desired horizontal position with respect to the base body 3. it can.

  Further, once the position of the positioning member 72 is adjusted, the fourth end 541 can always be brought into contact with the positioning member 72 by the urging force of the pair of tension springs 73 in the extended state. That is, since the fourth end portion 541 can be brought into contact with the positioning member 72 that has been adjusted in position (adjustment of the horizontal position of the upper support 4), the desired horizontal position with respect to the previously set base body 3 can be obtained. The upper support 4 can be positioned.

  Further, since the base body 3 and the upper support body 4 respectively support the upper and lower ends of the screen body 2, the horizontal movement of the upper support body 4 with respect to the base body 3 due to the bending of the pair of arm portions 53, 54 described above. The effect that the flatness of the projection surface of the screen main body 2 can be satisfactorily prevented can be achieved.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the above-described embodiment, the base body 3 and the upper support body 4 are configured to support the upper and lower end portions of the screen body 2. However, the present invention is not limited thereto, and the left and right end portions of the screen body 2 are supported. A configuration may be adopted.
Moreover, in the said embodiment, although the base body 3 was installed in the floor surface, you may install so that the base body 3 may be installed in a ceiling etc. and the screen main body 2 may hang down toward a floor surface from a ceiling. Absent.

In the above-described embodiment, the guide holes 311 and 41 and the auxiliary guide holes 42 drilled in the base body 3 and the upper support body 4 are employed as the guide part and the auxiliary guide part. Alternatively, a rail protruding from the upper support 4 may be employed.
In the above embodiment, the pantograph mechanism 5 has two pairs of arm portions 51 and 52 (53, 54). However, the present invention is not limited to this, and only one pair or three pairs of arm portions are provided. The configuration described above may be used.

In the above-described embodiment, the shape and arrangement position of the positioning member 72 and the biasing member (a pair of tension springs 73) are not limited to the shape and arrangement position described in the above embodiment, and other shapes and arrangement positions are employed. It doesn't matter.
In the embodiment, the pair of arm portions 51 and 52 (53 and 54) are connected by the fulcrum 5A (5B) at a substantially central position. It doesn't matter.
In the embodiment, the screen 1 is configured to include the spring roll 32, but the present invention is not limited to this, and the spring roll 32 may be omitted.

  Since the screen of the present invention can maintain the flatness of the projection surface well, it can be used as a screen on which image light enlarged and projected from a projector or the like is projected.

The figure which shows typically schematic structure of the screen in this embodiment. The figure for demonstrating the structure of the drive device in the said embodiment. The figure for demonstrating the structure of the position adjustment mechanism in the said embodiment. The figure which looked at the operation | movement until the screen in the said embodiment is set from an accommodation state to an extended state from the back side. The figure which looked at the operation | movement until the screen in the said embodiment is set from an accommodation state to an extended state from the back side. The figure for demonstrating the adjustment method of the horizontal position of the upper support body by the position adjustment mechanism in the said embodiment. The figure for demonstrating the subject of the conventional structure.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Screen, 2 ... Screen main body, 3 ... Base body, 4 ... Auxiliary support body, 5 ... Pantograph mechanism, 6 ... Drive apparatus, 41 ... 2nd guide hole (Guide part), 42 ... auxiliary guide hole (auxiliary guide part), 51-54 ... arm part, 72 ... positioning member, 73 ... tension spring (biasing member), 311 ... 1st guide hole (guide part) 511 ... 1st edge part, 521 ... 2nd edge part, 531 ... 3rd edge part, 541 ... 4th edge part, P4 ... Normal position .

Claims (4)

A flexible screen body on which image light is projected;
A base body and an auxiliary support body that respectively extend along a pair of opposed end portions of the screen body, and respectively support the pair of end portions;
A pantograph mechanism that is disposed across the base body and the auxiliary support, and separates and closes the base body and the auxiliary support;
A drive device for operating the pantograph mechanism,
The pantograph mechanism is
A pair of arm portions rotatably connected so as to have an X-shape, wherein the first end portion and the second end portion of the pair of arm portions on the base body side are turnable to the base body; And a third end and a fourth end on the auxiliary support side of the pair of arm portions are rotatably connected to the auxiliary support,
The first end and the third end are positioned in the same direction with respect to the second end and the fourth end, respectively.
In the base body and the auxiliary support body,
The first end and the third end are engaged with each other, and the driving device drives the first end to move along the extending direction of the base body. Guide portions that are moved along the extending direction of the auxiliary support are provided,
The auxiliary support includes
From the normal position where the fourth end portion is positioned in a state where the pair of arm portions are not bent while engaging with the fourth end portion, the third end portion is extended along the extending direction of the auxiliary support body. The auxiliary guide part which enables the said 4th edge part to move in the direction to space apart is provided. The screen characterized by the above-mentioned. The screen of claim 1,
A plurality of pairs of arm portions;
The plurality of pairs of arm portions are coupled along the opposing direction of the base body and the auxiliary support body so as to interlock with the other pair of arm portions,
The pair of arm portions arranged closest to the base body side have the first end portion and the second end portion, respectively.
The pair of arm portions disposed closest to the auxiliary support side have the third end portion and the fourth end portion, respectively. The screen according to claim 1 or 2,
The auxiliary support includes
A positioning member that contacts the fourth end by movement of the fourth end in a direction away from the third end, and a biasing member that biases the fourth end toward the positioning member Is provided,
The positioning member is
The screen is provided so as to be movable along the extending direction of the auxiliary support. The screen according to any one of claims 1 to 3,
The base body supports a lower end portion of the screen body,
The auxiliary support body supports an upper end portion of the screen main body.

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