JP2008070748A - Foldable screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foldable screen which is easily carried and also is easily assembled. <P>SOLUTION: The foldable screen 1 is provided with: a screen curtain 2; a pair of rib members 3A and a pair of rib members 3B; a cylinrical member 4; four coupling members 5; and a shaft-like member 6. The rib members 3A and 3B support the corner parts of the screen curtain 2 by their one-side ends. The cylindrical member 4 turnably supports the other ends of the rib members 3A and 3B. The coupling members 5 are turnably provided on the rib members 3A and 3B. The shaft-like member 6 turnably supports the coupling members 5 respectively and is inserted to freely slide through the cylindrical member 4. By such constitution, the foldable screen 1 is easily opened/closed by sliding the shaft-like member 6 in the cylindrical member 4. Furthermore, the foldable screen 1 in the closed state is housed more compactly than that in the opened state, so that it is easily carried. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a folding screen.

2. Description of the Related Art Conventionally, there is known a projector that modulates light emitted from a light source according to image information to form an optical image and enlarges and projects the optical image on a screen.
Here, as the screen on which the optical image is projected, for example, a tripod stand type screen in which the screen curtain is supported on a tripod stand, or a suspended screen that is fixed by being suspended from a ceiling or the like and pulled down the screen curtain Etc. are known. Usually, these screens are installed in conference rooms and the like and are difficult to carry.

On the other hand, a foldable screen that can be carried is also known (see, for example, Patent Document 1).
The foldable screen described in Patent Document 1 discloses a foldable screen configured to include a severable frame and a screen curtain. When storing such a foldable screen, the frame body can be divided and stored by removing the screen curtain from the frame body, and can be easily carried.

JP 2002-31506 A

  However, in the folding screen of Patent Document 1, the divided frames are connected, and the folding screen is assembled by attaching a screen curtain to the frame, so that there is a problem that the assembling method is complicated and time-consuming. It was.

  An object of the present invention is to provide a foldable screen that is easy to carry and easy to assemble.

  The foldable screen of the present invention includes a flexible screen curtain on which an optical image is projected, a plurality of bone members that support corners of the screen curtain at one end, and a surface facing the screen curtain. And a cylindrical member that rotatably supports the other end of the bone member, and is rotatable between the one end and the other end of each bone member. A plurality of connecting members provided on the shaft, and a plurality of connecting members that rotatably support the plurality of connecting members, and a shaft-shaped member that is slidably inserted into the cylindrical member. It is not on a normal extending from the center of the screen curtain.

  According to the present invention, since a plurality of bone members, a cylindrical member, a plurality of connecting members, and a shaft-shaped member are provided, it is easy to slide the shaft-shaped member with respect to the cylindrical member. The folding screen can be opened and closed. Furthermore, since the folding screen in the closed state can be stored smaller than in the opened state, it can be easily carried.

  First, when the folding screen is closed from the opened state, the shaft-like member is slid in the direction of the screen curtain. Thereby, since the plurality of connecting members are rotatably supported by the plurality of bone members and the shaft-like member, as the shaft-like member slides in the direction of the screen curtain, It approaches a nearly parallel state. When each connecting member is in a state substantially parallel to the axis of the shaft-like member, each bone member, the tubular member, each connecting member, and the shaft-like member are in a state substantially parallel to each other, and the whole is closed. It becomes a state. Then, since the corner of the screen curtain is supported by each bone member, the screen curtain is folded.

  Next, when the folding screen is opened from the closed state, the shaft-like member is slid in the direction opposite to the screen curtain. Thereby, since the plurality of connecting members are rotatably supported by the plurality of bone members and the shaft-shaped member, as the shaft-shaped member slides in the direction opposite to the screen curtain, It approaches a state substantially perpendicular to the axis. When each connecting member is in a state substantially perpendicular to the axis of the shaft-like member, each bone member is pressed by each connecting member and opened. Then, since the corner of the screen curtain is supported by each bone member, the screen curtain is stretched.

  Further, since the cylindrical member is not on the normal extending from the center of the screen curtain, the normal extending from the center of the screen curtain and the optical axis direction of the projection optical device in the projector or the like are made to coincide with each other so that an optical image is displayed on the screen curtain. When enlarging and projecting, the cylindrical member or the bone member does not become a shield, and the folding screen can be easily used.

  In the present invention, the screen curtain is formed in a substantially rectangular shape, and among the bone members, a bone member supporting an end portion sandwiching one side of the screen curtain has an end portion sandwiching one side facing the one side. It is preferably shorter than the supporting bone member.

According to the present invention, since the screen curtain is formed in a substantially rectangular shape, the substantially rectangular screen curtain can be stretched by sliding the shaft-like member with respect to the cylindrical member.
Further, among each bone member, the bone member that supports the end portion that sandwiches one side of the screen curtain is shorter than the bone member that supports the end portion that sandwiches one side opposite to the one side. It is possible to avoid being on a normal extending from the center.

In this invention, it is preferable that the said bone member is comprised so that expansion-contraction is possible.
According to the present invention, when opening the folding screen, the bone member can be extended and opened, and when closing the folding screen, the bone member can be contracted and closed.
Therefore, the folding screen can be stored smaller and can be easily carried.

In the present invention, the screen curtain is preferably formed of a stretchable material.
According to the present invention, the screen curtain expands and contracts in accordance with the tension transmitted from each bone member to the screen curtain. For example, by opening the shaft-like member with respect to the cylindrical member, the opening angle of each bone member Can be adjusted, and the size of the screen curtain can be changed.

Further, in the case where the foldable screen is constituted by the above-described telescopic bone member, the size of the screen curtain can be changed by changing the expansion / contraction rate of the bone member.
Further, for example, in the case where the folding screen is configured by an extendable connecting member, the size of the screen curtain can be changed by changing the expansion ratio of the connecting member.
Therefore, when an optical image is enlarged and projected onto the screen curtain by a projector or the like, the size of the screen curtain can be changed according to the projection area.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a schematic view showing a state in which the folding screen 1 is opened, and FIG. 2 is a schematic view showing a state in which the folding screen 1 is closed.
As shown in FIG. 1, the foldable screen 1 includes a screen curtain 2, a pair of bone members 3 </ b> A, a pair of bone members 3 </ b> B, a tubular member 4, four connecting members 5, and a shaft-like member 6. And is configured.

The screen curtain 2 is formed in a substantially rectangular shape with a flexible material, and an optical image is projected thereon. The screen curtain 2 has holes 21 formed at four corners.
The bone members 3 </ b> A and 3 </ b> B support the corner of the screen curtain 2 at one end, and include a connection member 31, a support portion 32, and a pin 33.
The bone members 3A and 3B are formed of a flexible material, and the bone member 3A is shorter than the bone member 3B.
The connecting member 31 is provided between one end and the other end of the bone members 3 </ b> A and 3 </ b> B, and pivotally supports one end of the connecting member 5. Thereby, the connection member 5 is rotatably provided between the screen curtain 2 and the cylindrical member 4 in the bone members 3A and 3B.
As shown in FIG. 2, the support portion 32 is inserted into the hole 21, and then the pin 33 is attached to the support portion 32. Thus, the bone members 3A and 3B support the screen curtain 2.

The cylindrical member 4 has an opening on the surface facing the screen curtain 2, and rotatably supports the other ends of the bone members 3A and 3B.
The connecting member 5 is rotatably provided between the screen curtain 2 and the cylindrical member 4 in the bone members 3A and 3B.
The shaft-shaped member 6 rotatably supports the connecting member 5 and is slidably inserted into the tubular member 4. Further, the shaft-like member 6 includes a stopper 61 that protrudes from the inside of the shaft-like member 6 by a spring structure (not shown) when the folding screen 1 is opened. When this stopper 61 is engaged with the cylindrical member 4, the bone members 3A and 3B are held in an open state.

  The folding screen 1 is installed on a predetermined installation surface with the bone member 3A side down as shown in FIG. That is, the folding screen 1 is supported by the cylindrical member 4 and the bone member 3A. Therefore, the lengths of the bone members 3A and 3B are adjusted so that the screen curtain 2 is stretched perpendicular to the installation surface.

Next, a method for opening and closing the folding screen 1 will be described.
The folding screen 1 is opened and closed by sliding the shaft member 6 with respect to the tubular member 4.
When the foldable screen 1 is closed from the opened state, as shown in FIG. 1, the stopper 61 is pressed into the shaft member 6 and the shaft member 6 is moved in the direction of the screen curtain 2 (FIG. 1). Slide in the middle arrow A). Thereby, since the connecting member 5 is rotatably supported by the bone members 3A and 3B and the shaft-shaped member 6, the shaft-shaped member 6 is moved as the shaft-shaped member slides in the direction of the screen curtain. It approaches a state that is substantially parallel to the axis of. When the connecting member 5 becomes substantially parallel to the axis of the shaft-like member 6, the bone members 3A and 3B, the tubular member 4, the connecting member 5, and the shaft-like member 6 are substantially parallel to each other. And the whole is closed. Then, since the apex portion of the screen curtain 2 is supported by the bone members 3A and 3B, the screen curtain 2 is folded.

  When the folding screen 1 is opened from the closed state, the shaft-like member 6 is slid in the direction opposite to the screen curtain 2 (arrow B in FIG. 2) as shown in FIG. As a result, the connecting member 5 is rotatably supported by the bone members 3A and 3B and the shaft-like member 6, so that the shaft-like member slides in the opposite direction to the screen curtain. It approaches a state substantially perpendicular to the axis of the member 6. When the connecting member 5 becomes substantially perpendicular to the axis of the shaft-like member 6, the bone members 3 </ b> A and 3 </ b> B are pressed by the connecting member 5 and opened. Then, since the apex portion of the screen curtain 2 is supported by the bone members 3A and 3B, the screen curtain 2 is stretched. At this time, the stopper 61 protrudes from the inside of the shaft-like member 6 by a spring structure (not shown). When the stopper 61 is engaged with the tubular member 4, the sliding of the tubular member 4 with respect to the shaft member 6 is restricted, and the bone members 3A and 3B are held in an open state.

Next, the projector 10 that magnifies and projects an optical image on the screen curtain 2 will be described.
FIG. 3 is a side view when the optical image is enlarged and projected from the projector 10 onto the folding screen 1.
As shown in FIG. 3, the projector 10 is installed and used behind the tubular member 4 with respect to the screen curtain 2, that is, the screen curtain 2, the tubular member 4, and the projector 10 in this order.
When installed and used in this way, when projecting an optical image on the screen curtain 2 in an enlarged manner by matching the normal extending from the center of the screen curtain 2 with the optical axis direction of the projection optical device in the projector 10, The member 4 and the bone members 3 </ b> A and 3 </ b> B do not become shielding objects, and the folding screen 1 can be easily used.

  The projector 10 may be installed at a position other than the rear side of the cylindrical member 4 with respect to the screen curtain 2, for example, installed above the cylindrical member 4 or between the cylindrical member 4 and the screen curtain 2. Also good. Furthermore, it may be installed on the opposite side of the cylindrical member 4 with the screen curtain 2 interposed therebetween. In short, when the projector 10 enlarges and projects an optical image on the screen curtain 2, the cylindrical member 4 and the bone member 3A are disposed. And 3B does not become a shield, and the folding screen 1 may be installed at a position where it can be easily used.

The projector 10 modulates the light emitted from the light source according to image information to form an optical image, and enlarges and projects the optical image by the projection lens 13. As shown in FIG. 3, the projector 10 includes an optical unit 14 that forms an optical image according to image information, a projection lens 13 that magnifies and projects the formed optical image, and an exterior housing 12 that houses these. And is configured.
Although not shown in FIG. 3, a power supply unit that supplies power to each component in the projector 10 and the projector 10 as a whole in a space other than the projection lens 13 and the optical unit 14 in the exterior housing 12. It is assumed that a control unit or the like for controlling is arranged.

The exterior casing 12 is made of a synthetic resin, and as shown in FIG. 3, the exterior casing 12 is formed in an overall substantially rectangular parallelepiped shape in which the projection lens 13, the optical unit 14, and the like are housed. The exterior casing 12 is not limited to a synthetic resin, but may be formed of other materials, for example, a metal or the like.
The projection lens 13 is a projection optical device that enlarges and projects the optical image formed by the optical unit 14 onto the screen curtain 2. The projection lens 13 is configured as a combined lens in which a plurality of lenses are housed in a cylindrical lens barrel.
The optical unit 14 modulates light emitted from the light source according to image information under the control of the control unit to form an optical image. As shown in FIG. 3, the optical unit 14 is functionally roughly divided into an integrator illumination optical system 15 and an optical device 16 having a liquid crystal light valve.

  The integrator illumination optical system 15 is an illumination optical system that uniformly illuminates an image forming area of a liquid crystal light valve that constitutes an optical device 16 to be described later. As shown in FIG. 3, the integrator illumination optical system 15 includes a light source device 151, a polarization conversion element 152, a rod integrator 153, and a superimposing lens 154.

The light source device 151 includes a plurality of solid light sources 17. The solid light source 17 includes a light emitting unit 172 provided on the element substrate 171. The light emitting unit 172 includes a light emitting layer composed of LED elements, and emits light corresponding to each LED element.
The polarization conversion element 152 is provided on the incident end face of the rod integrator 153, and converts light emitted from the light source device 151 into substantially one type of linearly polarized light (P-polarized light in the present embodiment).
In a projector using a liquid crystal panel of a type that modulates polarized light, only one type of linearly polarized light can be used, and therefore approximately half of the light from the light source device 151 that emits randomly polarized light cannot be used. For this reason, by using the polarization conversion element 152, the light emitted from the light source device 151 is converted into approximately one type of linearly polarized light, thereby increasing the light use efficiency.

The rod integrator 153 is formed of a translucent material such as glass and has a rectangular cross section. The rod integrator 153 receives light emitted from the light source device 151 from the incident end surface, and repeatedly reflects the incident light inside the rod integrator 153. The in-plane illuminance of the light is made uniform and emitted from the exit end face.
The light emitted from the rod integrator 153 is superimposed on the image forming area of the liquid crystal light valve by the superimposing lens 154.

The optical device 16 modulates incident light according to image information to form an image. The optical device 16 includes a liquid crystal light valve as a light modulation device to which light from the integrator illumination optical system 15 is incident.
Although not shown, the liquid crystal light valve includes an incident side polarizing plate, a liquid crystal panel, and an emission side polarizing plate in order from the illumination optical axis direction. This liquid crystal panel uses, for example, a polysilicon TFT as a switching element, and a liquid crystal as an electro-optical material is hermetically sealed in a pair of opposed transparent substrates. These liquid crystal panels modulate light incident through an incident-side polarizing plate provided on the light incident side according to image information, and emit the light through an emission-side polarizing plate provided on the light emitting side.

Here, the incident side polarizing plate transmits only polarized light (P-polarized light in the present embodiment) that vibrates in a certain direction and absorbs other light (S-polarized light in the present embodiment). A polarizing film is attached to a substrate.
The exit side polarizing plate is also configured in substantially the same manner as the incident side polarizing plate, and transmits only polarized light in a predetermined direction and absorbs other light out of the light emitted from the liquid crystal panel. However, in this embodiment, the vibration direction of polarized light to be transmitted is set to be orthogonal to the vibration direction of polarized light that is transmitted through the incident side polarizing plate, and the exit side polarizing plate transmits only S polarized light. , Absorbs P-polarized light.

The foldable screen 1 according to the present embodiment has the following effects.
(1) Since the foldable screen 1 includes a pair of bone members 3A and a pair of bone members 3B, a tubular member 4, four connecting members 5, and a shaft-like member 6, the tubular screen 1 By sliding the shaft-shaped member 6 with respect to the member 4, the folding screen 1 can be easily opened and closed. Furthermore, since the foldable screen 1 in the closed state can be stored smaller than in the opened state, it can be easily carried.

(2) Since the bone member 3 </ b> A is shorter than the bone member 3 </ b> B, the cylindrical member 4 can be prevented from being on the normal extending from the center of the screen curtain 2. Therefore, when an optical image is enlarged and projected onto the screen curtain 2 by matching the normal extending from the center of the screen curtain 2 with the optical axis direction of the projection optical device in the projector 10, the cylindrical member 4 and the bone member 3A, and 3B does not become a shield, and the folding screen 1 is easy to use.

[Second Embodiment]
A folding screen 1 according to a second embodiment of the present invention will be described.
In the foldable screen 1 according to the first embodiment, the bone members 3A and 3B are composed of one member. However, in the foldable screen 1 according to the present embodiment, the bone members 3C and 3D are The screen curtain 2 is configured to be stretchable by three members, and the screen curtain 2 is formed of a stretchable material.
In the following description, parts that have already been described are assigned the same reference numerals and description thereof is omitted.

FIG. 4 is a diagram showing bone members 3C and 3D of the folding screen 1 of the present embodiment.
Like the bone members 3A and 3B, the bone members 3C and 3D support the corner of the screen curtain 2 at one end, and include a connection member 31, a support portion 32, and a pin 33.
The bone members 3C and 3D are formed of a flexible material, like the bone members 3A and 3B, and the bone member 3C is shorter than the bone member 3D.
The bone members 3C and 3D are constituted by tubes 301, 302, and 303 as shown in FIG.
The tube 301 can be stored inside the tube 302, and the tube 302 can be stored in the tube 303. As a result, the bone members 3C and 3D are configured to be stretchable.
In addition, the length of each tube in the bone members 3C and 3D is a length obtained by dividing the length of each bone member into three equal parts. That is, each tube in the bone member 3C is shorter than each tube in the bone member 3D.

When the folding screen 1 is closed from the opened state, the bone members 3C and 3D can be contracted after the entire screen is closed as in the first embodiment.
When the folding screen 1 is opened from the closed state, the bone members 3C and 3D can be first extended and then opened in the same manner as in the first embodiment.
At this time, since the screen curtain 2 is formed of a stretchable material, for example, the folding screen 1 can be opened while the tube 302 is housed in the tube 303. Furthermore, since the length of each tube in the bone members 3C and 3D is a length obtained by dividing the length of each bone member into three equal parts, the screen curtain 2 is stretched perpendicular to the installation surface. Accordingly, when the projector 10 enlarges and projects an optical image on the screen curtain 2, the size of the screen curtain 2 can be changed according to the projection area.

In this embodiment as well, the same actions and effects as in the first embodiment can be obtained, and the following effects can be obtained.
That is, since the bone members 3C and 3D can be contracted and closed, the foldable screen 1 can be stored smaller and can be easily carried.
Further, since the screen curtain 2 expands and contracts in accordance with the tension transmitted from the bone members 3C and 3D to the screen curtain 2, the size of the screen curtain 2 is changed by changing the expansion ratio of the bone members 3C and 3D. can do.

[Modification of Embodiment]
It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
In each of the embodiments described above, the screen curtain 2 is formed in a substantially rectangular shape, but may be formed in another polygonal shape, an elliptical shape, or the like. In short, it is sufficient that an optical image can be projected onto the screen curtain.
In each of the above-described embodiments, four bone members 3A and 3B and four connecting members 5 are provided. However, the number of the bone members 3A and 3B and the number of the connecting members 5 may be less than this or more than this. What is necessary is just to provide according to the shape of a curtain.

In the second embodiment, the screen curtain 2 is formed of a stretchable material. However, in the first embodiment, the screen curtain 2 may be formed of a stretchable material.
In each of the embodiments described above, the projector 10 is configured as a single-plate projector including one liquid crystal panel, but is not limited thereto, and may be configured as a three-plate projector including three liquid crystal panels. Moreover, you may comprise as a projector provided with two liquid crystal panels, or a projector provided with four or more liquid crystal panels.

In each of the above embodiments, a transmissive liquid crystal light valve having a different light incident surface and light emitting surface is used. However, a reflective liquid crystal light valve having the same light incident surface and light emitting surface may be used. Good.
In each of the above embodiments, the projector 10 including the liquid crystal light valve is illustrated as the light modulation device. However, any other light modulation device that modulates incident light according to image information to form an optical image may be used. You may employ | adopt the light modulation apparatus of a structure. For example, the present invention can be applied to a projector using a light modulation device other than the liquid crystal layer, such as a device using a micromirror.

Schematic which shows the state which opened the folding screen. Schematic which shows the state which closed the foldable screen. It is a side view at the time of enlarging and projecting an optical image from a projector to a folding screen. The figure which shows the bone member of the foldable screen of 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Folding screen, 2 ... Screen curtain, 3A ... Bone member, 3B ... Bone member, 3C ... Bone member, 3D ... Bone member, 4 ... Cylindrical member, 5 ... Connection member, 6 ... Shaft-like member, 301 ... Tube, 302 ... tube, 303 ... tube.

Claims (4)

A flexible screen curtain onto which an optical image is projected;
A plurality of bone members supporting the corners of the screen curtain at one end;
A cylindrical member having an opening on a surface facing the screen curtain, and rotatably supporting the other end of the bone member;
A plurality of connecting members rotatably provided between the one end and the other end of each bone member;
Each of the plurality of connecting members is rotatably supported, and includes a shaft-like member that is slidably inserted into the cylindrical member,
The folding screen characterized in that the cylindrical member is not on a normal extending from the center of the screen curtain. The folding screen according to claim 1,
The screen curtain is formed in a substantially rectangular shape,
The folding screen according to claim 1, wherein a bone member that supports an end portion sandwiching one side of the screen curtain is shorter than a bone member that supports an end portion sandwiching one side opposite to the one side among the bone members. The folding screen according to claim 1 or 2,
The foldable screen is characterized in that the bone member is configured to be stretchable. The foldable screen according to any one of claims 1 to 3,
The foldable screen is characterized in that the screen curtain is formed of a stretchable material.

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