JP2014035512A - Magnet screen device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnet screen device that, as a pulled-down type device whose screen is used in a pulled-down state in a horizontally fixed state even on a concavely curved blackboard, can be used without suffering wrinkles on or loosening of the screen surface and further readily permits setting of the fixing angle and extension of the screen.SOLUTION: A magnet screen device intended to enable part of a concavely curved blackboard B to be used as a projection screen by being fitted to the upper frame part Ba of the concavely curved blackboard B comprises a screen surface 2a on the front side, a screen sheet 2 with magnetic force on the rear side, a take-up roll 4 for taking up the screen sheet 2, and an extensible linking member 5 intervening between the screen sheet 2 and the take-up roll 4.

Description

  The present invention relates to a magnetic screen device used for a blackboard or the like, and more specifically, in a state where it is horizontally fixed with respect to a blackboard that is bent along the left and right directions (hereinafter referred to as “concave blackboard”). The present invention relates to a magnetic screen device that can maintain flatness without causing wrinkles or slack in the screen surface even when the screen is pulled down.

  2. Description of the Related Art Conventionally, as a screen used for a blackboard, a position information detection and supply unit having a projection member having a projection surface, detection means for detecting a position indicated by an instruction member, and supply means for supplying position information to a personal computer is provided. An interactive screen, wherein the projection member is made of a magnetic material that can be wound and stretched, and a winding means capable of winding the projection member, and the wound projection member There is a magnetic screen device provided with a storage portion for storing the material (for example, Patent Document 1).

This magnetic screen device is gripped by the hand by holding the tip of the projection member by hand and pulling it out of the storage unit. When the back of the projection surface of the projection member is aligned with the blackboard provided in the classroom, the magnetic screen device is fixed to the blackboard by magnetic force. Also, the fixed state is maintained, so that the blackboard can receive the pressing of the pointing portion by the pointing member and can function in the same manner as a normal interactive board.
However, if such a screen is attached to the concave blackboard, the flat screen extended from the cylindrical winding means is magnetically attached to the blackboard surface that is concave in plan view. The front and rear gaps between the left and right central portions of the screen increase with the blackboard surface, and the distance from the storage portion to the blackboard surface increases accordingly, and the screen surface is pulled upward. As a result, the screen surface is distorted when viewed from the front, and wrinkles and slack are generated on the screen surface, making it difficult to maintain the flatness of the screen surface.

  Further, as a screen that can be attached to the concave blackboard without causing wrinkles or slack, a sheet having a magnet sheet formed on the back surface, one first permanent magnet attached to one side of the sheet, and the above sheet A second permanent magnet attached to the side and a winder, and when not in use, the sheet is wound around the winder, while in use, the sheet is stretched from the winder. There is also a magnet screen device in which the magnet sheet and the first and second permanent magnets are held by being magnetically attached to an object to be magnetized (for example, Patent Document 2).

This magnet screen device was formed on the back surface of the sheet by magnetizing a permanent magnet on one side of the sheet to the blackboard, fixing one side of the sheet, and rotating the winder along the blackboard to stretch the sheet The magnet sheet is magnetically attached to the blackboard, and the permanent magnet on the opposite side of the sheet is magnetically attached to the blackboard to complete the fixing of the sheet body to the blackboard, and the user selects the sheet feeding direction. Is something that can be done.
For this reason, when using with respect to a concave blackboard, it can be used also for a concave blackboard without generating a wrinkle or a slack by using the sheet | seat feeding direction as a horizontal direction.
However, when used as a horizontal pulling type in this way, it is difficult to adjust the installation angle and to expand the screen, especially when a large screen is used. On the contrary, the screen surface was wrinkled and slackened.

Utility Model Registration No. 3093287 JP 2002-3084 A

  The present invention intends to solve the above-described situation in view of the above-mentioned situation, as a pull-down type that is used by lowering the screen downward in a state of being horizontally fixed to a concave blackboard or the like. It is also possible to provide a magnetic screen device that can easily set a fixed angle and extend a screen.

  In order to solve the above problems, a magnetic screen device according to the present invention has a screen surface on the front side and a magnetic sheet on the rear side, a winding roll for winding the screen sheet, and the screen sheet. It is interposed between the winding rolls and includes a connecting member having elasticity.

  Here, it is preferable that the connecting member has a sheet shape having substantially the same left-right width dimension as the screen sheet or a plurality of strips extending vertically.

  Further, it is more preferable that the connecting member has a sheet shape having substantially the same left-right width dimension as the screen sheet, and is provided with a plurality of slits extending vertically in the installed state.

  Furthermore, the stretchability of the connecting member may increase as it approaches the center in the left-right direction.

  Furthermore, there is a lock means for releasably fixing the winding roll at a first feeding position where all of the screen sheet and the connecting member are drawn and a second feeding position where only the connecting member is wound. It can be made.

  Further, it is more preferable that the lower end bar of the screen sheet is provided with a lower end bar having at least the flexibility in the front-rear direction and having a magnetic force on the rear surface side.

  According to the magnet screen device according to the present invention, even when it is attached as a pull-down type to a curved surface along the left-right lateral direction, such as a concavely curved blackboard, the stretchable connecting member includes the blackboard and the winding means. In order to absorb the difference in gap between the screen sheets, the screen sheet can be spread on the concave blackboard without causing distortion, wrinkles or slack in the screen surface.

Here, according to the connecting member having a sheet shape having substantially the same width dimension as the screen sheet, it can be wound around a winding roll without a sense of incongruity like the screen sheet. In addition, it is not necessary to use a winding roll, the manufacturing cost can be reduced, and there is no burden on the screen sheet in the winding state, and the durability of the screen sheet can be maintained high.
Further, when the connecting member is formed as a plurality of strips extending vertically, it is possible to perform a design according to the curved surface to be installed by adjusting the stretchability and attachment position of the strip.

  Further, according to the connecting member having a sheet shape having substantially the same left-right width dimension as the screen sheet and provided with a plurality of slits extending vertically in the installed state, the connecting member acts together with the elasticity of the connecting member. And since the difference of the gap of a concave blackboard and a winding roll is absorbed, the flatness of a screen surface can be ensured more appropriately.

  Furthermore, if the stretchability of the connecting member increases (wells well) as it approaches the center in the horizontal direction, the screen between the concave blackboard and the blackboard increases when installed on the concave blackboard. It is possible to reduce the load applied to the center portion of the sheet and reliably prevent distortion and slack.

  And a lock means for releasably fixing the winding roll at a first feeding position where all of the screen sheet and the connecting member are drawn and a second feeding position where only the connecting member is wound. If the connecting member is not required, such as attachment to a flat blackboard, only the screen sheet can be fed out and pasted on the blackboard.

  Further, when the lower end bar of the screen sheet is provided with a lower end bar having at least the flexibility in the front-rear direction and having a magnetic force on the rear side, the lower end bar is magnetically attached to the concave blackboard. Can be pasted on the blackboard, and the screen sheet can be pasted easily and appropriately.

It is a perspective view showing the state where the magnet screen device concerning the embodiment of the present invention was installed in the blackboard which bends as a horizontal pull type. It is explanatory drawing which similarly shows the structure of a magnet screen apparatus, (a) is a front view, (b) is a right view. It is a top view which similarly shows the structure of a magnet screen apparatus. It is a front view which similarly shows the structure of the other example of a magnet screen apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, and includes all embodiments that satisfy the requirements described in the claims. .

  In this specification, let the screen surface side be a front surface of a magnet screen apparatus, and let the sticking surface side which is the opposite surface be a rear surface.

As shown in FIGS. 1 and 2, the magnet screen device 1 according to the present embodiment is used by attaching a part of the concave blackboard B as a projection screen by being attached to the upper frame Ba of the concave blackboard B. A screen sheet 2 having a screen surface 2 a on the front surface side and having a magnetic force on the rear surface side, a winding roll 4 for winding the screen sheet 2, and a screen sheet 2 and a winding roll 4. It is provided with a connecting member 5 that is interposed therebetween and has elasticity.
Here, the magnet screen device 1 is used as a projection screen, but is not limited thereto, and can be used as, for example, an electronic blackboard or a whiteboard. Further, the shape of the surface to be attached is not limited to the concave surface as shown in FIG. 1, but may be a flat surface or a convex surface.

The screen sheet 2 is configured such that the entire front surface is a screen surface, and the rear surface has a magnetic force that allows the screen sheet 2 to be attached to a blackboard or the like.
Further, an elongated lower end bar 6 for smoothly feeding and winding the screen sheet 2 is provided on the front end side of the screen sheet 2. The lower end bar 6 is provided with a magnet that can be attached to the rear surface side, and is held in a state of being attached to a blackboard or the like by the magnetic force of the magnet during expansion. Further, the lower end bar 6 is formed in a vertically long rectangular shape in a longitudinal sectional view so as not to bend in the vertical direction and to be bent in accordance with the curved surface of the concave blackboard B in the front-rear direction (horizontal direction).
The screen sheet 2 is stored by being wound into the housing 3 by the winding roll 4.

The casing 3 has a long and narrow rectangular shape, and a slit having a width and thickness larger than those of the screen sheet 2 is provided on the surface on the side where the screen sheet 2 is fed out. It is paid out. Further, the slit is formed with a width and thickness that are smaller than the lower end bar 6 provided on the front end side of the screen sheet 2. For this reason, when all the screen sheets 2 are wound up when the screen sheet 2 is wound, the lower end bar 6 cannot pass through the slits and comes into contact with the housing 3 to complete the winding.
Attachment portions 3a are provided at the left and right ends of the rear surface of the housing 3, and the magnet screen device 1 is attached to the concave blackboard B by fixing the attachment portions 3a to the upper frame Ba of the concave blackboard B with screws. Attached to.

The take-up roll 4 has a cylindrical shape and is housed in the casing 3, and a spring member that rotates and urges the take-up roll 4 in the direction of taking up the screen sheet 2 is attached to the take-up roll 4. The biasing force of the spring member can be released by operating the screen sheet 2. About rotation of the screen sheet 2, it is not restricted to such a structure, For example, you may rotate by a drive device.
The winding roll 4 is wound with the connecting member 5 and the screen sheet 2 connected to the lower end of the connecting member 5.

The connecting member 5 is formed in a sheet shape having the same width and thickness as the screen sheet 2 and has elastic elasticity, and one of the opposing long sides (upper side) is the winding roll 4. The other (lower side) is connected to the screen sheet 2. For this reason, when the winding roll 4 is rotated in the winding direction from the stretched state of the screen sheet 2, the connecting member 5 is first wound and then the screen sheet 2 is wound. Finally, the lower end bar 6 of the screen sheet 2 comes into contact with the housing 3 and the process ends.
The connecting member 5 does not extend so much when the screen sheet 2 and the lower end bar 6 are suspended by the connecting member 5, but when the screen sheet 2 is magnetically attached to the concave blackboard B, it extends according to the tensile force. The connecting member 5 is not particularly limited as long as it has stretchability, but it is preferable that the stretchability becomes higher as it approaches the center in the left-right direction (well stretched / lower elastic modulus). This is because, as shown in FIG. 3, the gap (gap) between the concave blackboard B and the winding roll 4 when the magnet screen device 1 is attached to the concave blackboard B is narrow at the left and right ends but relatively wide at the center. This is because the gap in the center needs to be absorbed by the elongation of the connecting member 5.
The material of the connecting member 5 is not particularly limited, but the connecting member 5 may be made of a material having stretchability, a material in which a string-like body is knitted, or a material in which the knitted material itself is knitted.
Further, the front surface side of the connecting member 5 may also have a screen surface. According to this configuration, the screen surface can be used as widely as possible in a blackboard or the like that does not bend.

The lower end bar 6 has flexibility in the horizontal direction and has a magnetic force on the rear surface, and is provided at the lower end of the screen sheet 2.
In order to feed out or wind up the screen sheet 2, the screen sheet 2 can be smoothly operated so as not to be wrinkled or loosened by operating the lower end bar 6 without being magnetized.
In addition, the lower end bar 6 may be provided with a release means for releasing the magnetic attachment to the blackboard or the like. For example, by providing a push-type release button at both the left and right ends, the removal can be performed more easily. Good.

  Next, the installation method to the concave blackboard B of the magnet screen apparatus 1 in this embodiment is demonstrated.

First, the left and right attachment portions 3a and 3a of the magnet screen device 1 are fixed to the upper surface of the upper frame Ba of the concavely bent blackboard B with screws.
Next, the lower end bar 6 located on the lower side of the housing 3 is pulled down, the screen sheet 2 and the connecting member 5 are fed out, and the rotation of the take-up roll 4 is locked at the first feeding position, which is a state where all are pulled out. In the state, the lower end bar 6 is magnetically attached to the concave blackboard B.
Finally, the screen sheet 2 is pressed against the concave curved blackboard B so that the entire surface of the screen sheet 2 is magnetized, and the screen can be used.

FIG. 4 shows another example of the magnet screen device according to the present embodiment. The connecting member 5A of the magnet screen device 1A is provided with a plurality of slits 5a, 5a, 5a,. Yes. This can more appropriately prevent wrinkles and slack that may occur when sticking to a concave blackboard or the like.
As another example of the connecting member, a slit may be provided in an oblique direction or a lateral direction, or a plurality of bands may be arranged in the horizontal direction.

In the above description, the screen sheet has shown a case where the entire sheet has a magnetic force, but the screen sheet is not limited to such a thing, and by partially having a magnetic force. Alternatively, it may be configured as easy to remove.
Further, the mounting portion may not be fixed to existing equipment such as a blackboard. For example, a rail member extending in the left-right direction is fixed to the mounting target, and the mounting portion is slidably engaged with the rail. As a result, the magnet screen device can be moved within the range of the rail member, and the installation location can be set more freely.
Furthermore, it is good also as what prevents the distortion | strain of the upper end part of a screen sheet by providing horizontally and elongated the shape-retaining bar in the upper end of a screen sheet, or the lower end of a connection member.

DESCRIPTION OF SYMBOLS 1 Magnet screen apparatus 2 Screen sheet 2a Screen surface 3 Housing 3a Mounting part 4 Winding roll 5 Connecting member 6 Lower end bar B Recessed blackboard Ba Upper frame

Claims (6)

A screen sheet having a screen surface on the front side and a magnetic force on the rear side;
A winding roll for winding the screen sheet;
A magnet screen device comprising a connecting member interposed between the screen sheet and the winding roll and having elasticity.   The magnetic screen device according to claim 1, wherein the connecting member has a sheet shape having substantially the same left-right width dimension as the screen sheet or a plurality of strips extending vertically.   The magnetic screen device according to claim 1, wherein the connecting member is in a sheet shape having substantially the same lateral width as the screen sheet, and is provided with a plurality of slits extending vertically in the installed state.   The magnet screen device according to claim 1, wherein the elasticity of the connecting member increases as it approaches the center in the left-right direction.   Locking means for releasably fixing the winding roll at a first feeding position where all of the screen sheet and the connecting member are drawn out and a second feeding position where only the connecting member is wound up is provided. The magnet screen apparatus of any one of Claims 1-4. The magnetic screen device according to any one of claims 1 to 5, wherein a lower end bar having at least a front-rear direction flexibility and a magnetic force is provided on a rear surface side at a lower end portion of the screen sheet.

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