JP2010264732A - Blackboard device equipped with mobile screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blackboard device usable safely and conveniently. <P>SOLUTION: The blackboard device includes a moving body 10 connected to be slidable along the front face of a main blackboard 1. The moving body 10 has a shelf part 13 having an upper shelf part 15 movable almost horizontally along an upper end face 1a in an attitude of facing the main blackboard 1, and a lower shelf part 16 movable almost horizontally along a lower end face 1b in an attitude of facing the main blackboard 1; a rod-like handle part 11 fixed in a vertical attitude so as to be orthogonal to the upper shelf part 15 and the lower shelf part 16; a support rod 5 with its tip part projected forward from the main blackboard 1; and a screen body 4 that can be arranged at the front face of the main blackboard 1. A projector and the screen body 4 installed at the upper shelf part 15 can be integrally moved along the surface of the main blackboard 1 by moving the moving body 10 almost horizontally by the operation of the handle part 11. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a blackboard device including a movable screen provided with a screen.

  A blackboard apparatus has been developed in which a screen is provided on a blackboard, and an image can be projected on the screen by a projector (for example, Patent Document 1). Such a projector for projecting an image on a screen needs to be arranged at a position separated from the blackboard. For example, the projector is installed on a desk between audience seats. In this case, since a part of the audience seat, particularly the center, is occupied by the projector, the projector is also suspended and fixed from the ceiling. In this method, construction for installing the projector is required, and user access to the projector once installed becomes difficult, and adjustment work and replacement of consumables are not easy. Further, since the angle of the projector cannot be changed, the position of the screen must be fixed at a predetermined position, and there is a problem that the installation location of the screen cannot be changed later.

  In response to such a problem, an electronic blackboard in which a blackboard and a projector are integrated has been developed (Non-Patent Document 1). In this projector, the projector is fixed to the tip of an arm protruding from the upper end of the blackboard. This electronic blackboard allows user access to the projector, and since the distance between the projector and the screen is set to be constant in advance, there is no need to perform operations such as focusing each time, and installation and adjustment of the projector There is an advantage that the work is relatively easy.

JP 2002-293091 A

“Electronic Information Board System” Aoi Chalkboard Mfg. Co., Ltd. <http://www.aoikokuban.co.jp/pdf/denshi_bo.pdf>

  However, since this electronic blackboard has a structure in which a relatively heavy projector is fixed to the tip of the arm, there is a problem that it is not easy to provide sufficient strength. In particular, when the screen or projector is movable, it is necessary to provide a moving mechanism, and the arm cannot be fixed to the blackboard side, and the support structure of the projector becomes more difficult. On the other hand, in this structure, since the projector is located near the head of the presenter standing in front of the blackboard, it is conceivable that the presenter always feels pressure from above even if it does not fall. In particular, since such blackboards are often delivered to schools, it is important to consider safety for minors and students.

  On the other hand, it is conceivable to use a small and lightweight projector to avoid falling, but a small projector that has been put into practical use is not suitable for use in an environment where the surroundings are bright because the amount of light is insufficient. In addition, a compact but high-brightness projector is extremely expensive. Furthermore, in order to display on a large screen using a small projector, it is necessary to increase the focal length, and the length of the arm tends to be long. However, the longer the arm, the more difficult it is to give strength. There was also a problem.

  In addition, in the structure in which the projector is fixed to the tip of the arm, there is a problem that the arm is bent and the projector is easily shaken. When the projector shakes, the image projected from here also shakes, and the screen becomes extremely difficult to see. This tendency becomes more prominent as the arm becomes longer and the projector becomes heavier. As a result, the screen is shaken by the influence of slight vibration or wind, and the image becomes unstable, which is inconvenient for the audience watching the image.

  The present invention has been made to solve the conventional problems. A main object of the present invention is to provide a blackboard device capable of reliably fixing a projector and capable of stably displaying an image while suppressing screen shaking.

  The blackboard device according to the first aspect of the present invention includes a main blackboard 1 and a moving body 10 slidably connected along the front surface of the main blackboard 1. Then, the moving body 10 serves as a slidable placing shelf 13 on the end face of the main blackboard 1 and in a posture facing the upper end face 1a of the main blackboard 1 in a planar upper direction that can move substantially horizontally along the upper end face 1a. The main shelf 1 and the main shelf 1, which has the shelf 15 and a flat lower shelf 16 that can move horizontally along the lower surface 1 b in a posture facing the lower surface 1 b of the main blackboard 1. A bar-shaped handle portion 11 fixed between the upper placing shelf portion 15 and the lower placing shelf portion 16 so as to be orthogonal to each other in a vertical posture so as to form a space between the front portion and the front end portion; Has a rod-like support rod 5 that protrudes forward from the main blackboard 1, and a roll-up screen body 4 that can be disposed on the front surface of the main blackboard 1. Further, the upper shelf 15 can fix a reflective projection device capable of projecting an image on the main blackboard, and at the tip of the support rod 5, at least a part of the light emitted from the projection device is placed on the main blackboard 1. A reflector 18 capable of reflecting on the side is fixed. Then, by operating the handle portion 11, the movable body 10 is moved substantially horizontally by sliding the upper end surface 1 a and the lower end surface 1 b of the main blackboard in a posture to be held by the upper placing shelf portion 15 and the lower placing shelf portion 16. By doing so, the projection device and the screen body 4 installed on the upper shelf portion 15 can be moved integrally along the surface of the main blackboard 1.

  Thereby, a projection apparatus can be stably supported by the upper end surface of a main blackboard. In addition, since a reflector that is much lighter than the projection device is fixed to the tip of the support rod, the shake of the support rod is reduced, and a stable projection image can be provided. Furthermore, by placing the storage shelf in a flat shape and passing the rod-shaped handle between the flat plates, the rigidity of the moving body can be increased, and the cause of image shake such as deflection can be reduced, thus providing a more stable projection image. Figured. In addition, the effect of increasing the focal length can be obtained by making the projection apparatus reflective. In addition, the handle can be operated at an arbitrary height by making the handle into a vertical rod shape, and the projection device can be operated by elementary school students or teachers regardless of the height difference of the user. And the advantage that the position of the screen body can be moved is also obtained.

  In the blackboard device according to the second aspect, the screen body 4 urges the take-up shaft 4c in the take-up direction around the take-up shaft 4c, and the screen is in the take-up state against the urging force. The first end 4a of the body 4 can be expanded by pulling it out in the horizontal direction, and the amount of expansion of the screen body 4 can be arbitrarily set by the amount of extraction of the screen body 4. Further, as a deployment maintaining mechanism for holding the first end 4 a of the screen body 4 and maintaining the deployed state of the screen body 4, the movable body 10 is moved along the same movement surface as the movement surface of the movable body 10. In a state in which the first end 4a of the screen body 4 is held while being movable independently, a deployment maintaining panel 60 that can be moved integrally with the moving body 10 can be provided. Thereby, it is possible to move freely on the main blackboard while maintaining the unfolded state of the screen body 4, and it is possible to arbitrarily change the position of the screen in the unfolded state, so that the area using the main blackboard can be flexibly changed. Is obtained.

  Further, the blackboard device according to the third aspect can fix the video source supply device that supplies the video source displayed by the projection device, with the lower shelf 16 being electrically connected to the projection device. As a result, the video source supply device that provides the source of the video to be displayed on the projection device can also be moved by the moving body together with the projection device. Can be eliminated.

  Furthermore, in the blackboard device according to the fourth aspect, the screen body 4 is placed on the first end portion 4a and the second end portion 4b on the side fixed to the take-up shaft 4c with respect to the video source supply device. Tool boxes 17 each having an icon for sending arbitrary position information instructed on the screen body 4 can be provided. As a result, a tool box can be provided on both sides of the screen body in the unfolded state, and the tool box is provided on the same side in either a state where only a part of the screen is unfolded or a state where the screen is fully opened. be able to. That is, when the image of the projection device is displayed directly on the main blackboard without unfolding the screen body, the moving body winds only a part of the tip, that is, only one end provided with the tool box, while the screen is stored. The toolbox can be used by leaving it or by pulling it out slightly so that the toolbox is displayed from the fully wound state. In the example of FIG. 1, a toolbox is arranged on the left side of the screen.

  On the other hand, the toolbox arranged on the other end side can be used even when the screen body is fully expanded. That is, in the example of FIG. 3, a tool box is arranged on the left side of the screen body. In this way, the tool box can be always placed at the same position (left side of the screen body in the example of FIG. 3) regardless of the amount of drawer of the screen body, so that the user can use the tool box at a fixed position without confusion.

  Furthermore, in the blackboard device according to the fifth aspect, the lower shelf 16 is provided with a foldable placement surface 16a for placing the video source supply device, and the placement surface 16a is not in use. It can be configured to be developed in a vertical posture so as to be substantially flush with the main blackboard, to be bent into a substantially horizontal plane when used, and to be held in a horizontal posture. Thereby, it can be put away so as not to get in the way when not in use, while being bent in a horizontal posture during use and protruding from the main blackboard surface.

  Furthermore, in the blackboard device according to the sixth aspect, the handle portion 11 of the moving body 10 is stored to store the space formed between the front surface of the main blackboard 1 in a state where the screen body 4 is wound up. Space 3 can be created. By separating the handle portion from the main blackboard surface in this way, the user can easily hold the handle portion by inserting a hand between the handle portion and the main blackboard. On the other hand, this space can also be used as a storage space for storing the screen body, making it easier to place the screen body and making the screen body in a wound state inconspicuous at the handle part, which makes the appearance clean. The effect that can be summarized is also obtained.

  Furthermore, in the blackboard device according to the seventh aspect, the handle portion 11 of the movable body 10 has a hollow shape, and the wiring of the projection device can be inserted into the hollow shape of the handle portion 11. As a result, the wiring can be gathered, and it is possible to clean up without displaying unnecessary codes outside.

  The blackboard device of the present invention can install a screen body at a free position with respect to the main blackboard. The blackboard device of the present invention can adjust the relative position of the screen body and the external device according to the installation position of the screen body. This external device is automatically fixed simultaneously with the positioning of the screen body. The screen body that can be installed at a free position on the main blackboard can be used conveniently together with the screen body and the main blackboard by freely allocating the use area of the screen body and the main blackboard. In addition, when the screen body is positioned, the blackboard device that can automatically fix the external device at an appropriate position corresponding to the installation position of the screen body adjusts the fixing position of the external device each time according to the installation area of the screen body. Since it is not necessary, it can be operated easily. In other words, it is possible to project beautifully on the screen body and the main blackboard without adjusting the focus and angle of the projector.

  This is because the blackboard device of the present invention includes a moving body that can move in a plane substantially parallel to the front surface of the main blackboard, and a screen body and a support rod are connected to the moving body. When the moving body is moved on the front surface of the main blackboard, the screen body and the support rod connected to the moving body also move simultaneously. That is, by moving the moving body to the place where the screen body is to be placed and pulling out the screen at that position, the screen body can be placed at a desired position on the main blackboard with an arbitrary development amount.

  In addition, the blackboard device of the present invention can support the projection device fixed to the placing shelf with the end face of the main blackboard. As a result, the moving projection device can always be supported by the main blackboard that is stationary, so that even a heavy-duty projection device can be firmly fixed to the blackboard device. Especially by connecting the handle part in the vertical direction of the upper shelf part, the upper shelf part can be firmly supported from below by this handle part. It can be stably fixed to the part.

  In the blackboard device of the present invention, the movable body is in a vertical posture with respect to the main blackboard. That is, since the moving body is long in the vertical direction, it is easy to hold for all users regardless of their height. The user can adjust the amount of expansion of the screen body by holding the moving body and applying a force in the horizontal direction to move the screen body horizontally and further pulling out the screen body in the horizontal direction. That is, since the operation direction required for the installation of the screen body is consistently horizontal, it is easy to operate and can be used easily.

  The blackboard device of the present invention can always fix the relative position of the external device regardless of the amount of movement of the screen body accompanying the movement of the moving body. This is because the movement amount of each member can be the same because the external device and the reflector move in a unit manner by the moving body. Therefore, it can be moved horizontally while maintaining the relative positions of the previously positioned members. As a result, the external device can be fixed at an appropriate position regardless of the area of the main blackboard. As a result, the main blackboard can be clearly projected.

1 is a front view of a blackboard device according to Embodiment 1. FIG. It is a front view of the blackboard apparatus which moved the mobile body. It is a front view of the blackboard apparatus which expanded the screen body. It is sectional drawing of the blackboard apparatus in the IV-IV 'line | wire of FIG. It is sectional drawing of the blackboard apparatus in the V-V 'line | wire of FIG. It is sectional drawing of the blackboard apparatus in the VI-VI 'line of FIG. It is a partially expanded view in the lower part when the blackboard device is viewed from the side. It is a partially expanded view in the lower part when the blackboard device is viewed from the side. It is a partially expanded view in the lower part when the blackboard device is viewed from the front. It is a partially expanded view in the lower part when the blackboard device is viewed from the front. It is explanatory drawing explaining the horizontal movement mechanism of the upper part of a blackboard apparatus. It is explanatory drawing explaining the horizontal movement mechanism of the lower part of a blackboard apparatus. It is a top view which shows an example of the conventional blackboard apparatus. It is a top view which shows an example of the conventional blackboard apparatus. It is a top view which shows an example of the conventional blackboard apparatus. It is explanatory drawing which shows the usage example of the conventional blackboard apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a blackboard device including a movable screen for embodying the technical idea of the present invention, and the present invention describes a blackboard device including a movable screen as follows. Not specific to anything. In addition, the member shown by the claim is not what specifies the member of embodiment. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present invention only to the description unless otherwise specified. It's just an example. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. In addition, the contents described in some examples and embodiments may be used in other examples and embodiments.

  A conventional screen placed on a blackboard has a fixed position, and the user has a problem that the use of the blackboard is restricted by the screen. In contrast, the inventor of the present application has previously developed a blackboard device that can arrange a screen at a free position with respect to the main blackboard (Japanese Patent Application No. 2008-335576). This blackboard apparatus is shown in FIGS. The blackboard device 200 of FIG. 11 includes a main blackboard 201, a screen 204 that can be disposed on the front surface of the main blackboard 201, and a moving body 202 that is connected to the main blackboard 201 in a state where the front surface of the main blackboard 201 can be moved. The blackboard device 200 includes a support rod 205 that can fix the projector PJ as a projector. The support rod 205 fixes the projector PJ to the tip that protrudes forward from the main blackboard 201. Thus, the projector PJ is positioned in front of the main blackboard that is separated from the main blackboard 1 and can project an image toward the main blackboard 1 side.

  The screen 204 is a roll screen that can be wound, and FIG. 11 shows a developed state, and FIGS. 12 and 13 show a completely wound state. The screen 204 and the support rod 205 are connected to the moving body 202, respectively. As a result, when the moving body 202 is moved in the horizontal direction as shown in FIGS. 12 and 13, the projector 204 connected to the screen 204 and the support rod 205 is also moved in the horizontal direction. Therefore, the user of the blackboard device 200 moves the moving body 202 to a place where the screen 204 and the projector PJ are to be arranged, and pulls the screen 204 to the right at that position, so that the desired of the main blackboard 201 is shown in FIG. The screen 204 can be arranged at an arbitrary development amount at the position.

  The blackboard device 200 of FIGS. 11 to 13 can automatically adjust the relative position of the screen 204 and the projector PJ according to the installation position of the screen 204. Because the screen 204 and the projector PJ are linked together, if the screen 204 and the projector PJ are positioned so as to have an appropriate positional relationship in advance, the screen 204 and the projector PJ are always This is because it is moved while maintaining its relative position. Therefore, when the moving body 202 is moved and the screen 204 is positioned, the projector PJ is automatically fixed at an appropriate position corresponding to the installation position of the screen 204. That is, since it is not necessary to adjust the fixed position of the projector PJ each time according to the installation area of the screen 204, the blackboard device 200 can be easily operated. The blackboard device 200 can neatly project onto the screen body without adjusting the focus and angle of the projector.

  By the way, it is desired that the blackboard apparatus can be used safely and conveniently. This is because the blackboard device is assumed to be used indoors where people of all ages gather, such as using it in the classroom to explain lesson contents or using it in the office to give presentations. Therefore, in the embodiment in which the projector for projection is fixed above the blackboard device, the projector must be securely fixed so that the projector does not fall. However, fixing a large and heavy projector above the head is not preferable for the mental health of the user. On the other hand, it is conceivable to use a small and lightweight projector to avoid falling, but in reality the light quantity is insufficient and it is not suitable for use in an environment where the surroundings are bright. In addition, a compact but high-brightness projector is extremely expensive. Therefore, it is essential to use a general-purpose projector, which is generally heavy, and firmly support the projector on the blackboard device in some way.

  In the blackboard device 200 of FIGS. 11 to 13, the projector PJ is fixed to the tip of a rod-like support rod 205 protruding forward from the main blackboard 201, in other words, the projector PJ is attached to the tip of the support rod 205. Total weight is applied. For this reason, the support rod 205 is required to have high strength. Further, if the load on the lower end of the support rod 205 is large, vibration caused by contact with the blackboard device 200 or horizontal movement may be conducted and the projector PJ may be swung. When the projector PJ shakes, the projected image also shakes, and the entire screen flickers and is difficult to see.

  In order to solve this problem, if the strength of the support rod 205 is increased by increasing or decreasing the thickness of the support rod 205, the weight of the support rod 205 itself and the moving body 202 that fixes the support rod 205 increases, and the connected blackboard apparatus side. The load on is increased. Further, when the weight of the moving body increases, smooth movement is also hindered. In particular, when the blackboard device 200 is used in a school or the like, there are many scenes where minors and women operate, and it is desirable to reduce the load required for the operation as much as possible. Furthermore, since the support rod 205 displays a large projection screen, a certain length is required. If the amount of protrusion from the main blackboard 201 is limited, and the separation distance between the main blackboard 201 and the projector PJ cannot be obtained sufficiently, the focal length becomes short and the screen becomes small. For this reason, there has been a demand for a blackboard device that increases the mechanical connection strength between the blackboard device and the projector and does not impair convenience and performance.

  On the other hand, when the blackboard device 200 of FIGS. 11 to 13 is actually used, the wiring of an external device such as a projector PJ or a personal computer (hereinafter also referred to as “PC”) becomes an obstacle, and the wiring is also caused by the movement of the screen. As a result of the movement, there is a possibility of inducing an unintended trouble such as catching a foot and coming off a line. This will be described with reference to FIG. FIG. 14 is an explanatory diagram showing a usage example of the blackboard device 200. When using the electronic blackboard 200, the personal computer PC is often connected as an external device. This is because the projection of the projector PJ can be controlled by the personal computer PC. For example, information entered on the main blackboard 201 side using an input means such as an electronic pen is taken into the personal computer PC via the scanner, and further transmitted to the projector PJ and projected onto the screen 204 from the projector PJ. The

  However, when the personal computer PC and the projector PJ are communicated with each other by wire, the wiring HS that connects the projector PJ and the personal computer PC is always exposed as shown in FIG. In particular, the wiring HS from the projector PJ located above the main blackboard 201 is troublesome because it droops across the main blackboard 201 vertically. Therefore, when the user moves in the vicinity of the blackboard device 200, it is necessary to be careful not to come into contact with the wiring HS by straddling the wiring HS. If the user's foot or body is caught on the wiring HS, the wiring HS may fall off, the connection plug may be damaged, or the user may fall.

  Further, when the projector PJ moves horizontally, the wiring HS is pulled and displaced by the projector PJ, which is more troublesome. In particular, since the wiring HS is set to a length with a certain margin in anticipation of the amount of movement of the projector PJ, there is a problem that the excessive wiring HS portion stagnates below the main blackboard 1 and becomes an obstacle to the user. was there.

  As a result of diligent research, the present inventor has fixed the projection apparatus by fixing the projection apparatus to the blackboard side while fixing the projection apparatus to the tip of the support rod. Increased strength to increase reliability. In addition, in order to increase the strength of the moving body that moves the projection device, a bar-shaped reinforcing member orthogonal to these is provided between the planes that hold the blackboard up and down, and this reinforcing member is also used as the handle portion. . As a result, the rigidity in the vertical direction is increased, and the upper and lower surfaces of the blackboard can be slid stably without bending the plane, improving the reliability and stabilizing the projected image and improving the visibility.

  As another advantage, just by operating the handle unit, the upper shelf unit and the lower shelf unit are interlocked to move substantially horizontally while maintaining the relative position of the projection device fixed to each shelf unit. Can be made. In addition, since the projection device can be firmly fixed on the upper end surface of the main blackboard that is stationary, it is possible to project from above the blackboard device. Furthermore, the wiring of the projection device and the video source supply device can be arranged and arranged inside the handle portion, and it is possible to avoid the wiring from being difficult to see across the main blackboard. In addition, while supporting the projection device with the stationary main blackboard, it is possible to support the reflector 18 that is lighter than the projection device at a position spaced from the main blackboard. Further, an optical path between the projection device and the reflector 18 can be secured, and an image projected from the projection device can be reflected by the reflector 18 and projected onto the main blackboard side. Furthermore, the screen body and the main blackboard can be conveniently used together while installing the screen body at a free position with respect to the main blackboard. Alternatively, the handle portion 11 of the moving body 10 is arranged away from the front surface of the main blackboard 1 and the storage space 3 is provided between the main blackboard 1 and the screen body 4 can be stored in the storage space 3. When the screen body 4 is not used, the use area of the main blackboard can be earned and projected onto the main blackboard. Further, the moving body 10 can move substantially horizontally on the main blackboard 1 together with the screen body 4 fixed via the winding shaft 4c, so that the horizontal position of the screen body 4 can be freely determined. Can be unfolded by pulling out the first end 4a of the screen 4 in a wound state in the horizontal direction, and the unfolding amount of the screen body 4 can be arbitrarily set in accordance with the unfolding amount of the screen body 4. Thereby, the use area of the screen body and the main blackboard can be freely distributed.

  A front view of the blackboard device according to the first embodiment is shown in FIGS. The blackboard device 100 according to the first embodiment can project the information of the video source supply device connected to the blackboard device 100 onto the screen or the blackboard by the projection device PJ. Further, by operating the projected screen with a video source supply device capable of detecting a position, the operation is reflected on the screen via the video source supply device. The blackboard device 100 according to the first embodiment will be described below. However, in this specification, the front side where the contents described in the blackboard device 100 can be visually recognized is referred to as “front”, and the back side of the blackboard device is referred to as “rear”.

  A blackboard device 100 according to the first embodiment includes a main blackboard 1 held in a vertical posture, and a moving body 10 connected to the main blackboard 1 in a state where the front surface of the main blackboard 1 can be moved. In FIG. 1 to FIG. 3, the main blackboard 1 is indicated by sand-like hatching so that the main blackboard 1 and other members can be easily distinguished. In addition, the moving body 10 includes a handle portion 11 disposed away from the front surface of the main blackboard 1 and a placing shelf portion 13 connected to the handle portion 11 and capable of fixing the projection device. The shelf 13 moves substantially horizontally along the edge of the main blackboard 1 as the handle 11 moves substantially horizontally. Therefore, the blackboard device 100 can move the projection device fixed to the placing shelf portion 13 along the end of the main blackboard 1 as the handle portion 11 is moved substantially horizontally.

  As a projection device fixed to the shelf 13, a projector that mainly projects an image can be used. In addition, a video source supply device that is connected to the projector and supplies a video source is also mounted on the storage shelf 13. As such a video source supply device, a personal computer PC is preferable. However, the video source supply device is not essential, and for example, a video source built in or integrated with the projection device can be used. For example, a type in which a presentation file is stored in a semiconductor memory, inserted into a projector, and the presentation file is switched and displayed can display a video without preparing a separate video source supply device. In this specification, the video includes not only a still image but also a moving image. Further, a speaker or the like can be appropriately added to the projection device or the video source supply device. In this example, a pointing device such as a light pen, a digitizer, or a mouse can be used. Furthermore, the video source supply device and the projection device are electrically connected, but the communication means is not particularly limited, and for example, serial or parallel connection such as USB, LAN, IEEE 1339 or the like can be used. In addition to the wired method, a wireless method may be used. As the wireless method, an existing communication method such as wireless LAN, RF, infrared communication, or optical communication can be used as appropriate. Further, the present invention is not limited to the exchange of information between the video source supply device and the projection device, and the power supply may be wireless or battery-driven. The wireless system is preferable because it eliminates connection cords and cables or reduces the number of cables, and is easy to handle.

  The user of the blackboard device 100 can move the moving body 10 to the right as shown in FIG. 2 by pulling or pushing the handle portion 11 of the blackboard device 100 of FIG. 1 to the right. Similarly, by pressing the moving body 10 leftward from the state of FIG. 2, the moving body 10 can be moved leftward to the position of FIG. When the moving body 10 is moved substantially horizontally as described above, the placing shelf portion 13 connected to the handle portion 11 is also moved substantially horizontally in conjunction with it. The blackboard device 100 includes a screen body 4 that can be disposed on the front surface of the main blackboard 1. The screen body 4 is a projection screen that can project a screen projected from the projection device PJ. The screen body 4 is connected to the moving body 10. Accordingly, by moving the moving body 10 in the lateral direction along the front surface of the main blackboard 1 (see the white arrows in FIGS. 1 and 2), the screen body 4 and the shelf 13 are moved to desired positions, for example, FIG. It can be moved to the indicated position. That is, the projection device PJ fixed to the screen body 4 or the placing shelf 13 can be arranged at any position.

  Moreover, the screen body 4 of FIGS. 1-3 is a screen which can be wound up. 1 and 2 show a state in which the screen body 4 is wound up, and FIG. 3 shows a state in which the screen body 4 is expanded. Specifically, by pulling out the right end corresponding to the first end 4a of the screen body 4 from the position of the screen body 4 in FIG. 1 in the right direction (see the black arrow in FIG. 1), as shown in FIG. The screen body 4 can be fully opened. However, the blackboard device 100 can also maintain a state where a part of the screen body 4 is unfolded. The winding shaft 4c of the screen body 4 is connected to the left end corresponding to the second end 4b of the screen body 4, and the right end 4a of the screen body 4 is a free end. In the example shown in the figure, the left end 4b of the screen body 4 and the winding shaft 4c are connected and fixed, and the screen body 4 is in a state of being wound in a roll shape as a basic posture. And the screen body 4 expand | deploys by pulling out the right end 4a of the screen body 4 from the winding shaft 4c, and moving it in a horizontal direction. That is, the development amount of the screen body 4 can be freely set according to the drawing amount of the screen body 4. The blackboard device 100 according to the first embodiment can move the moving body 10 horizontally with respect to the main blackboard 1 and can open and close the screen body 4 in the horizontal direction with reference to the position where the main blackboard 1 is positioned. The amount of deployment can be set freely.

  In addition, the blackboard device 100 according to the first embodiment can directly project an image on the main blackboard 1 without using the screen body 4. This is because the space on the main blackboard 1 can be freely distributed by winding up the roll type screen body 4. Then, the image can be projected by projecting onto the main blackboard 1 that has been exposed. In other words, the blackboard device 100 is not limited to the screen body 4 or the main blackboard 1 for the projection location.

  In addition, the shelf 13 includes an upper shelf 15 connected to the upper end of the handle 11 as shown in FIGS. That is, the handle portion 11 can support the upper placing shelf 15 from below and firmly support the load of the upper placing shelf 15. In the example of FIGS. 1 to 3, the upper placing shelf 15 is connected to the upper end of the handle portion 11 in a substantially vertical posture in a substantially horizontal posture. To support. Further, the upper placing shelf 15 connected to the handle portion 11 moves substantially horizontally along the upper end of the main blackboard 1 in conjunction with the substantially horizontal movement of the handle portion 11.

  The upper placement shelf 15 places and fixes the projection device PJ on the placement surface 15 a located on the upper surface of the upper placement shelf 15. The upper shelf 15 can move in a substantially horizontal direction while sliding on the upper end surface 1a in a posture covering the upper end surface 1a of the main blackboard 1. Accordingly, the projection device PJ fixed to the upper shelf 15 can be moved in a substantially horizontal direction while being supported by the upper end of the main blackboard 1.

  In this manner, the upper shelf 15 is slidably mounted on the upper end surface 1a of the main blackboard 1, and the projection device PJ is fixed to the upper shelf 15 so that the projection device PJ can be placed upward. It can always be supported by the upper end surface 1a of the main blackboard 1 through the shelf 15. Further, by connecting the handle portion 11 in the vertical direction of the upper shelf portion 15, the handle portion 11 becomes a solid column of the upper shelf portion 15, so that the projection device PJ fixed to the upper shelf portion 15 is further strengthened. Can be fixed.

  In addition, the shelf 13 of the first embodiment further includes a lower shelf 16 connected to the handle 11. The lower placing shelf 16 can move substantially horizontally along the lower end of the main blackboard 1. The lower shelf 16 can fix a video source supply device PC that can be electrically connected to the projection device PJ. In FIG. 1, the video source supply device PC is indicated by a broken line, and members located behind the video source supply device PC are displayed. Further, as shown in FIGS. 1 to 3, the blackboard device 100 bridges the handle portion 11 between the upper placing shelf portion 15 and the lower placing shelf portion 16, and as a result, the upper placing shelf with the handle portion 11. The portion 15 and the lower shelf 16 can be moved together while firmly connected.

  Further, the blackboard device 100 includes a support rod 5 having one end connected to the moving body 10 and the other end protruding forward from the main blackboard 1. On the other end of the support rod 5, a reflector 18 capable of reflecting at least a part of light emitted from the projection device PJ to the main blackboard 1 side can be fixed. In FIG. 1 to FIG. 3, the reflector 18 is indicated by a broken line, and members located behind the reflector 18 are displayed.

  The blackboard device 100 of FIGS. 1 to 3 having the above-described configuration pulls the handle portion 11 to the left and right, so that the entire moving body 10, that is, the handle portion 11 and the placing shelf portion 13 integrally connected to the handle portion 11 are provided. It can be moved in a substantially horizontal direction. As a result, each member fixed to the moving body 10 can be moved in a substantially horizontal direction while being maintained at a relative position. Below, the relative position of each member is demonstrated.

(Relative position of each member)
For example, the projection device PJ and the support rod 5 fixed to the upper shelf 15 of the moving body 10 can always have a predetermined relative position regardless of the amount of movement of the moving body 10. This is because, when the handle portion 11 is moved sideways, the entire moving body 10 moves substantially horizontally, so that the moving amount of each member interlocked with the moving body 10 can be the same as the moving amount of the moving body 10. It is. Therefore, the projection device PJ and the support rod 5 can be moved in the substantially horizontal direction while maintaining a predetermined positional relationship. Similarly, the relative position between the reflector 18 fixed to the support rod 5 and the projection device PJ can always be maintained at a predetermined level. As a result, the horizontal direction of the main blackboard 1 is maintained while the projection device PJ and the reflector 18 are always maintained in a positional relationship in which the projection from the projection device PJ is clearly imaged on the main blackboard 1 via the reflector 18. Can be placed at any position.

  In addition, the relative position between the screen body 4 and the projection device PJ can be maintained at a predetermined level by fixing each member to the moving body 10 that moves in front of the main blackboard 1 in a substantially horizontal direction. This is because the projection device PJ is pre-positioned so as to be arranged at a predetermined position of the screen body 4, for example, the center of the total width with respect to the screen body 4 in a fully opened state, and fixed to the upper shelf 15. Projection can be performed almost symmetrically from substantially the center of the screen body 4. Specifically, the projection device PJ is fixed to the upper shelf 15 so that the distance from the handle portion 11 to the projection device PJ is substantially half the total width of the screen body 4. As a result, when the blackboard device 100 is deployed in the horizontal direction with respect to the handle portion 11 at an arbitrary position, the blackboard device 100 is always positioned above the center of the screen body 4 regardless of the installation position of the screen body 4. Can be placed automatically. Therefore, it is not necessary to adjust the fixed position of the projection device PJ each time according to the installation area of the screen body 4, and thus it can be easily operated. That is, it is possible to neatly project onto the screen body 4 without adjusting the focus and angle of the projection device PJ, and the blackboard device can be conveniently used.

  Thus, by fixing the projection device PJ on the upper shelf 15 at a position corresponding to the screen body 4, the projection device PJ can be moved to an appropriate position of the screen body 4 only by moving the handle portion 11 substantially horizontally. Can be automatically aligned. However, the projection device PJ may be added with a function capable of being aligned with the screen body 4 independently of the moving body 10. Specifically, the projection device PJ is configured to be able to move on the upper shelf 15 in a substantially horizontal direction. Then, even when the moving body 10 is stationary, the projection apparatus PJ can be independently moved substantially horizontally, and the relative position between the screen body 4 and the reflector 18 can be adjusted by moving the projection apparatus PJ. Can do. Thereby, first, the projection device PJ is moved in the horizontal direction by the handle portion 11 to roughly position the relative position with respect to the screen body 4 or the reflector 18, and then the position of the moving body 10 is fixed. By moving the projection device PJ independently in the horizontal direction, the relative position with respect to the screen body 4 or the reflector 18 can be finely adjusted. Thus, by positioning the projection device PJ in two stages, it is possible to project onto a more appropriate region.

  Further, the projection device PJ can always be centered automatically with respect to the screen body 4 according to the pulling amount of the screen body 4 by using a form in which the projection device PJ can move horizontally independently of the moving body 10. it can. This can be achieved by linking the projection device PJ with the drawing operation of the screen body 4 and determining the horizontal movement amount of the projection device PJ according to the drawing amount of the screen body 4. For example, a horizontal movement mechanism for moving the projection device PJ and the screen body 4 is provided separately, and the movement speed of each horizontal movement mechanism is relatively adjusted. For example, by adjusting the respective horizontal movement mechanisms so that the movement amount of the projection device PJ is approximately half of the drawing amount of the screen body 4, the movement speed of the projection device PJ is substantially equal to the deployment speed of the screen body 4. The projection device PJ can be fixed at substantially the center of the width of the screen body 4 at all times. Hereinafter, each member of the blackboard device 100 will be described in detail.

  4 is a cross-sectional view of the blackboard device 100 taken along the line IV-IV 'of FIG. 3, and shows a cross-sectional view of the blackboard device 100 in the vicinity of the right end of the screen body 4 in the unfolded state. FIG. 5 is a cross-sectional view of the blackboard device 100 taken along the line V-V ′ of FIG. 1, and shows a cross-sectional view of the blackboard device 100 in the vicinity of the right end of the screen body 4 in the stored state. FIG. 6 is a cross-sectional view of the blackboard device 100 taken along the line VI-VI ′ of FIG. 1 and shows a cross-sectional view of the blackboard device 100 in the vicinity of the handle portion 11 of the screen body 4 in the stored state.

(Main blackboard)
The main blackboard 1 is a rectangular plate that is installed on a wall of a school classroom or the like or is self-supporting. The main blackboard 1 shown in the figure has a horizontally long and narrow rectangle. The main blackboard 1 has a blackboard paint applied to the front so that characters and figures can be written and erased. The colored blackboard can be used to write letters and figures with chalk, or the letters can be erased with ink. And a white board on which figures can be written. A magnet can be attached to the front surface of the main blackboard 1. The main blackboard 1 to which the magnet is attached is obtained by mixing metal powder into the blackboard paint or by making the plate surface made of metal. As the metal powder to be contained in the blackboard paint, iron powder can be used, and the metal plate surface is preferably made of steel or iron enamel from the viewpoint of resistance.

(Moving body)
The moving body 10 has a handle portion 11 that is arranged in a vertical posture away from the front surface of the main blackboard 1. A user of the blackboard apparatus 100 can hold the handle portion 11 and pull or push it left and right. The handle portion 11 according to the first embodiment has a long and narrow bar shape, and has a length corresponding to the short side of the main blackboard 1 and takes a posture substantially parallel to the short side.

(Handle part)
As shown in FIGS. 4 to 6, the handle portion 11 is fixed in a posture that is separated from the front surface of the main blackboard 1 and floats on the front surface, and a storage space 3 is provided in the gap between the handle portion 11 and the main blackboard 1. Yes. The blackboard device 100 can arrange the screen body 4 in the storage state in the storage space 3. The screen body 4 can be stored in the storage space 3 while being separated from the handle portion 11 of the moving body 10.

  The handle portion 11 provided with the storage space 3 and separated from the main blackboard 1 is easily gripped by the user. Specifically, since the user of the blackboard device 100 can put his hand in the storage space 3 and firmly grip the outer peripheral surface of the handle portion 11, the handle portion 11 can be easily operated. In addition, the handle portion 11 that is spaced apart from the screen body 4 positioned in the storage space 3 has a hand in the gap between the handle portion 11 and the screen body 4 even in the storage state where the screen body 4 is thickest. The handle portion 11 can be firmly gripped. The movable body 10 that can grip the outer peripheral surface of the handle portion 11 is preferable because it easily transmits the user's force. Further, the shape and thickness of the outer periphery of the handle portion 11 are easy to be grasped by the user. For example, the handle portion 11 can have various shapes by making the cross-sectional shape of the handle portion 11 circular or rectangular and providing a concave portion along the shape of the finger in a part of the moving body 10. Further, the handle portion 11 in the vertical posture can be gripped at an arbitrary position in the vertical direction. In other words, it is easy to use because the user can reach the handle portion 11 without depending on the height of the user.

  Further, the moving body 10 has a structure in which the upper end surface 1a and the lower end surface 1b of the main blackboard 1 are covered with the upper end and the lower end, respectively. Specifically, as shown in FIGS. 4 to 6, the handle portion 11 extends in the vertical direction while being separated from the front surface of the main blackboard 1, and is further bent upward from the upper and lower ends of the handle portion 11. The upper end surface 1a and the lower end surface 1b of the main blackboard 1 are connected to each other by the portion 2e and the lower bent portion 2f. That is, the moving body 10 is connected to the main blackboard 1 in such a posture that the upper end surface 1a and the lower end surface 1b of the main blackboard 1 are sandwiched by the upper bent portion 2e and the lower bent portion 2f.

  The upper shelf 15 is connected to the upper end of the handle portion 11, the upper shelf 15 is used as the upper bent portion 2 e, and the lower support plate 38 is connected to the lower end of the handle portion 11. The support plate 38 is a lower bent portion 2f. In other words, the handle portion 11 bridges the upper placement shelf 15 and the lower support plate 38 in the vertical direction, and interlocks the upper placement shelf 15 and the lower support plate 38 together. Further, since the load on the upper shelf 15 can be firmly supported from below by the handle portion 11, the upper shelf 15 can be prevented from tilting or swinging back and forth. In the example of FIG. 4, the lower shelf 16 is connected to the lower support plate 38, so that the handle portion 11 is integrally linked while supporting the lower shelf 16 via the lower support 38. Can be made. The lower placing shelf 16 is connected to the lower support plate 38, and therefore the handle portion 11 can be integrally interlocked while supporting the lower placing shelf 16 via the lower support plate 38.

  More specifically, in the example of FIG. 4, by holding the upper end and the lower end of the handle portion 11 with the upper flat plate 15b and the lower flat plate 16b protruding forward from the upper and lower portions of the main blackboard 1, respectively. The handle portion 11 can be held in a vertical posture. That is, the upper end of the handle portion 11 is connected to the upper placing shelf portion 15 via the upper flat plate 15b, while the lower end of the handle portion 11 is connected to the lower support plate 38 via the lower flat plate 16b. In other words, the upper flat plate 15b and the lower flat plate 16b are abutted and bridged by the handle portion 11 in a vertical posture, that is, the handle portion 11 is supported so that the upper flat plate 15b and the lower flat plate 16b can maintain a substantially parallel posture. Yes. As a result, the upper placing shelf 15 and the lower placing shelf 16 connected to the handle portion 11 via the upper flat plate 15b and the lower flat plate 16b are substantially normal to the main blackboard 1 so as not to be tilted up and down. A posture protruding in the direction can be maintained.

  The moving body 10 is made of a sturdy material because it is connected to the placing shelf portion 13 and the screen body 4 for fixing the projection device PJ and is loaded. The handle portion 11 is made of a molded product such as metal or synthetic resin, or a combination thereof. The material of the handle portion 11 is preferably steel or reinforced plastic. Moreover, the material of the storage shelf 13 and the support rod 5 can be the same as that of the handle 11. Since the storage rack portion 13 and the support rod 5 molded from the same material as the handle portion 11 can have the same expansion coefficient, damage due to the connecting portion can be reduced. Further, the movable body 10 can be integrally molded to increase the bending strength. Or the material of the moving body 10 and the support rod 5 shall be different, and the total amount of a blackboard apparatus can also be reduced as a structure which connected this.

  Alternatively, the handle portion 11 may be hollow, and the wiring of the projection device PJ may be inserted into the hollow handle portion 11. As a result, the cable can be stored neatly as will be described in detail later. Alternatively, a dedicated cable storage body may be connected to the moving body 10, the wiring of the projection device PJ may be stored in the cable storage body, and interlocked with the moving body 10. The cable housing is provided in a vertical posture, that is, substantially parallel to the handle portion 11, and has an insertion hole penetrating in the vertical direction through which the wiring can be inserted. Accordingly, the wiring of the projection device PJ placed above can be inserted from the upper end to the lower end of the cable housing, and the wiring drawn out on the lower side can be connected to the video source supply device. As a result, it is possible to reduce the exposure of the auxiliary device mounted on the upper and lower sides of the main blackboard 1, that is, the projection device PJ and the video source supply device PC, thereby avoiding damage. In addition, tangling and hooking of the wiring can be prevented. In particular, entanglement of the code can be avoided by moving the video source supply device such as a personal computer together with the mobile screen body.

(Upper shelf holder)
The upper shelf portion 15 connected to the upper end of the handle portion 11 is connected to the main blackboard 1 in a posture covering the upper end surface 1a of the main blackboard 1 as described above. As shown in FIGS. 1 to 3, the upper placing shelf 15 can move in a substantially horizontal direction while sliding on the upper end surface 1 a of the main blackboard 1. Further, the projector PJ fixed to the upper placing shelf 15 in FIG. 1 is a projector PJ. The projector PJ moves substantially horizontally along with the upper shelf 15 linked to the handle 11 by the user pulling the handle 11 left and right. Further, the projector PJ is supported on the upper end surface 1 a of the main blackboard 1 via the upper shelf 15. This makes it possible to stably fix the projector as compared with the conventional configuration in which the projector is fixed in a suspended manner at a position spaced forward from the main blackboard 1. This is because the main blackboard 1 is firmly fixed to the wall surface, and the blackboard device 100 for mounting and fixing the projector PJ on the upper end surface 1a of the main blackboard 1 firmly holds the load of the projector PJ with the main blackboard 1. It is because it can support. In other words, the main blackboard 1 is connected in the vertical direction of the projector PJ, and the main blackboard 1 can firmly support the load of the projector PJ from below. Further, even when the projector PJ moves horizontally, the projector PJ can be slid while being continuously in contact with the upper end surface 1a of the main blackboard 1 via the upper shelf 15, so that the projector PJ is always held by the main blackboard 1. I can support it. As a result, even a general-purpose projector PJ having a large weight can be prevented from being shaken back and forth due to vibration or deflection during horizontal movement.

  The upper shelf 15 of the first embodiment is long in the substantially horizontal direction as shown in FIGS. Since the projector PJ is fixed to the upper placing shelf 15 and moves substantially horizontally together with the upper placing shelf 15, the movement amount of the upper placing shelf 15 becomes the movement amount of the projector PJ. Further, the upper shelf 15 has a placement surface 15a for fixing the projector PJ as shown in FIG. The placement surface 15 a is a substantially horizontal plane that is connected to the upper end surface 1 a of the main blackboard 1 and protrudes from the upper end surface 1 a to the front of the main blackboard 1. The projector PJ is fixed on the placement surface 15 a and moves along the upper end surface 1 a of the main blackboard 1. As the projector PJ, a known projector can be used. For example, the projector PJ of Embodiment 1 has a projection window 51 at the front, and the blackboard device 100 has a reflector 18 disposed in the middle of the optical path from the projector PJ to the main blackboard 1 as shown in FIG. . The projector PJ emits an image forward through the projection window 51. The emitted image proceeds to the reflector 18, is reflected by the mirror surface 18 a, and is projected on the front surface of the main blackboard 1. Therefore, the projector PJ is preferably a reflection type. The blackboard apparatus 100 can replace the projector PJ.

(Angle adjustment)
Moreover, it is preferable that the projector PJ can adjust the projection direction. Thereby, a video can be projected clearly on the main blackboard 1 side. In particular, in the case of a reflective projector PJ, by adjusting the projection direction, the relative position to the reflector 18 can be appropriately positioned, and light loss can be reduced. As a result, it is possible to clearly project the main blackboard 1 side while maintaining the light amount substantially. For example, in the first embodiment, the projection angle of the projector PJ can be changed and the projection direction can be adjusted. Specifically, as shown in FIG. 4, the blackboard device 100 fixes the projector PJ via an attachment member 8 connected to the placement surface 15a, and the attachment member 8 can be deformed so that the projector PJ is set at a predetermined angle. Tilt. The attachment member 8 can be fixed to the upper shelf 15 while adjusting the mounting angle so that the projector PJ can be tilted in the vertical direction, and the projection direction can be changed. Specifically, as shown in a partially enlarged view of a region surrounded by a round frame in FIG. 4, the mounting member 8 is fixed to the top plate 8c for fixing the projector PJ below and the stationary surface 15a. The standing wall 8a is provided. The top plate 8c includes side plates 8b that protrude downward from both sides. The top plate 8c and the upright wall 8a are connected via the side plate 8b. The standing wall 8a and the side plate 8b are planar and are in contact with each other in an overlapping posture. The side plate 8b is slidable with respect to the standing wall 8a and can swing in the front-rear direction (see the arrow in FIG. 4). The projector PJ fixed to the top plate 8c is inclined by the movement of the side plate 8b, that is, the placement angle of the projector PJ can be changed.

  In the example of FIG. 4, through holes 53 are provided in the upper and lower portions of the standing wall 8 a and the side plate 8 b that are in contact with each other, and the upper and lower fastening members 52 that pass through the through holes 53 are raised. The wall 8a and the side plate 8b are fixed. The fastening member 52 can use a pair of nuts and bolts. Further, the lower through hole 53 is a long hole cut out in the front-rear direction, so that the top plate 8c can be moved in the vertical direction through the side wall 8b while the upper fastening member 52 is used as the central axis. For example, when the front end of the top plate 8c is pulled downward, the side plate 8b rotates around the upper fastening member 52, and at the same time, the lower fastening member 52 moves rearward along the elongated hole. As a result, the front end of the top plate 8c is lowered, and the projector PJ is inclined downward. On the contrary, when the front end of the top plate 8b is pulled upward, the lower fastening member 52 is guided forward along the elongated hole, and the side plate 8b swings forward around the upper fastening member 52. As a result, In conjunction with the top plate 8b, the projector PJ tilts upward. That is, the mounting member 8 can be tilted so that the mounting angle of the projector PJ becomes desired, adjusted to a suitable projection angle, and fixed at a predetermined tilt angle. However, the adjustment of the placement angle of the projector PJ is not limited to this method, and a known means can be used. Further, since the projector PJ is fixed by screwing, future maintenance and replacement are facilitated by removing the screws.

(Support rod)
On the other hand, the support rod 5 connected to the moving body 10 turns the reflector 18 fixed at the tip to the projection window 51 of the projector PJ so as to move forward from the rear of the projector PJ. As a result, the light source emitted from the projector PJ through the projection window 51 travels to the mirror surface 18a of the front reflector 18 and is reflected backward, and is projected on the main blackboard 1 side.

  The support rod 5 is interlocked with the moving body 10, that is, can move horizontally together with the moving body 10. Specifically, the support rod 5 is fixed to the upper shelf 15 of the moving body 10. The support rod 5 in FIG. 4 is substantially key-shaped and protrudes from the rear to the front at the upper end of the main blackboard 1. Further, the support rod 5 is connected to the rear portion of the mounting surface 15a, an upright portion 5a extending substantially upward from the connecting portion, and an extended portion 5b extending in a posture protruding forward from the upper end of the upright portion 5a, Consists of The support rod 5 bent in a substantially right angle by the upright portion 5a and the extending portion 5b is disposed above the placement surface 15a, and between the placement surface 15a and the upper support rod 5. A projector PJ is arranged. And the front-end | tip of the extending | stretching part 5b is spaced apart from the front surface of the main blackboard 1, and it has mounted | worn with the attitude | position which suspended the reflector 18 at this front-end | tip. In other words, the reflector 18 is fixed so that the mirror surface 18a of the reflector 18 is substantially parallel to the front surface of the main blackboard 1 while being supported from above by the extending portion 5b. The reflector 18 is an optical system means that can refract at least part of incident light, and a known means such as a mirror or a lens can be used. The shape of the mirror surface 18a is not particularly limited, and various forms such as a planar shape, a curved surface shape, a convex shape, and a concave shape can be used. In addition, by adopting the reflector 18 with an appropriate selection of focal length, aperture ratio, angle of view, numerical aperture, etc., the projected image can be sharpened and various projectors PJ can be used.

  The support rod 5 in FIG. 4 is fixed in such a posture that the axial direction of the extending portion 5 b is slightly inclined downward from the normal line of the main blackboard 1. In addition, the tip of the extending portion 5b that connects the reflector 18 in a suspended manner does not particularly limit the connection method with the reflector 18. For example, a support shaft is provided on the reflector 18 side in the connection region, and a bearing that allows the outer surface of the support shaft to be fitted while being rotatable is provided on the extending portion 5b side. Then, the support shaft and the bearing are fitted, and the reflector 18 and the extending portion 5b are rotatably connected. When the user of the blackboard device 100 changes the fixing angle of the reflector 18, the outer surface of the support shaft and the inner surface of the bearing are slid and fixed by pressing the reflector 18 in a desired direction. The angle can be changed. As a result, the relative angle between the reflector 18 and the projector PJ can be adjusted. Further, by engaging the support shaft and the bearing with appropriate friction, both can be connected while maintaining a predetermined fixed angle.

  The blackboard device 100 in which the relative position between the reflector 18 and the projector PJ is always constant can be used by positioning the reflector 18 and the projector PJ in a position suitable for the main blackboard 1 in advance. This is convenient because it is not necessary to move the reflector 18 and the projector PJ each time. In particular, the fixed position of the reflector 18 is determined in advance according to the focal length of the projector PJ, so that adjustment is not necessary. On the other hand, the reflector 18 may be pivoted at the tip of the support rod 5 so that the relative angle between the reflector 18 and the projector PJ can be adjusted as desired. The blackboard device 100 that can adjust the relative position of the reflector 18 and the projector can finely adjust the arrangement of the mirror or the projector according to the environment.

  Moreover, the connection method of the extending | stretching part 5b and the reflector 18 is not limited above, Various forms, such as a hinge type, are employable. Further, the adjustment of the mirror surface 18a of the reflector 18 may be performed in another portion of the support rod 5 regardless of the connection region with the extending portion 5b. For example, by adjusting the configuration angle of the mirror surface 18a of the reflector 18 by operating the support rod 5 side with a part of the extending portion 5b being a telescopic type or a form composed of a plurality of members that can freely combine angles. You can also.

  In the example of FIG. 4, the extending portion 5 b is constituted by a plurality of pipes, and the entire periphery of the first pipe 5 c is slidably fitted to the inner periphery of the second pipe 5 d so as to be extendable as a whole. Alternatively, the support rod 5 may be pivotable around the connecting portion between the upright portion 5a and the upper placing shelf portion 15. The support rod 5 that can turn one end of the support rod 5 can be positioned by moving the reflector 18 supported on the other end so that it can be freely moved left and right. Further, the support rod 5 is turned or the extending portion 5b is a spline type so that the tip of the support rod 5 can be brought close to or separated from the main blackboard 1 and the distance between the projector and the mirror can be adjusted.

  By making the support rod 5 deformable in this way, the reflector 18 and the projector PJ can be simply operated by operating the support rod 5 side that supports the light reflector 18 while fixing the inclined posture of the heavy projector PJ. It can be used conveniently because the relative position with can be adjusted. As a result, a keystone correction, a focus correction, etc. can be performed, and it can project on the upper side of the main blackboard 1 clearly. In addition, the projection area can be adjusted by expanding and contracting the length of the optical path.

  Further, the support rod 5 may be connected to the attachment member 8 to increase the connection strength. In the example of FIG. 4, a rod reinforcing member 14 that connects the mounting member 8 and the support rod 5 is provided above the projector PJ. The rod reinforcing member 14 is rotatably connected to each of the mounting member 8 and the support rod 5. One end of the rod reinforcing member 14 in FIG. 4 is fixed to the standing wall 8a so as to be rotatable about the fastening member 52 above the mounting member 8 as a central axis, while the other end of the rod reinforcing member 14 is supported. It is connected to the upright portion 5 a of the rod 5. Therefore, the extending portion 5 b of the support rod 5 is connected to the mounting surface 15 a of the moving body 10 via the rod reinforcing member 14 and the attachment member 8. As described above, the mounting surface 15 a is supported by the handle portion 11 of the moving body 10 below, and thus the extending portion 5 b of the support rod 5 is supported by the handle portion 11. Further, as described above, one end of the upright portion 5a of the support rod 5 is connected to the rear portion of the placement surface 5a. The rear portion of the placement surface 5 a is located above the upper end surface 1 a of the main blackboard 1. Therefore, the support rod 5 can be structured such that one end thereof is supported by the upper end surface 1a of the main blackboard 1 and is supported by the handle portion 11 from below also in the extending portion 5b. 1 and a plurality of support columns 11 can be firmly supported from below.

  As described above, the blackboard device 100 in which the movable body 10 is provided with the upper shelf 15 and the projector PJ and the support rod 5 are fixed to the upper shelf 15, the image of the projector PJ is displayed on the main blackboard 1. Can be projected neatly at the position. This is because the amount of movement of the projector PJ and the reflector 18 can be made the same, and the projector PJ and the reflector 18 can be fixed at an arbitrary position while maintaining the relative position between them. Further, the projector PJ and the reflector 18 can be aligned so as to be arranged in a substantially straight line along a substantially normal direction on the main blackboard 1. As a result, since the light emitted from the projector PJ can be efficiently advanced to the reflector 18, it is possible to project clearly on the main blackboard 1 side while suppressing the loss of the light amount.

(relative position)
In the blackboard device 100 according to the first embodiment, the entire mobile unit 10 is connected to the screen body 4, the projector PJ, the reflector 18, and the personal computer PC as a single unit, and the entire unit is integrally linked. Accordingly, each member has the same amount of movement, and as a result, it can be horizontally moved to an arbitrary position on the main blackboard 1 with the relative position of each member being predetermined. This is because the position of each unit is determined in advance so that the position can be clearly projected on the main blackboard 1 side, and the unit moving distance is determined and the mounting position of the screen body 4 is fixed. The PJ, the reflector 18 and the personal computer PC are also fixed at a predetermined relative position with respect to the screen body 4. Since the movement amount of each member is managed by the unit, it is not necessary to individually control the movement amount of each member. Therefore, the installation position of the screen body 4 can be freely set only by moving the handle portion 11 and each member can be fixed at an appropriate position corresponding to the position of the screen body 4.

(Lower support plate)
Moreover, the blackboard apparatus 100 of FIGS. 1-4 is equipped with the powder receiver 24 provided continuously and horizontally along the lower end of the main blackboard 1. FIG. The powder receiver 24 is provided in a posture protruding forward from the lower end of the main blackboard 1. The powder receiver 24 protruding forward can catch the powder falling downward from the main blackboard 31 and suppress the powder from being scattered on the floor. An accessory such as an electric cleaner can be fixed to the powder receiver 24 at a desired position.

  The blackboard device 100 has a bent portion 2f that covers the lower end surface 1b of the main blackboard 1 while projecting rearward at the lower end of the handle portion 11 as described above. In the blackboard device 100 of FIG. 4, a lower support plate 38 is adopted as the bent portion 2 f and is connected to the lower end of the handle portion 11. However, the lower support plate 38 can be molded integrally with the handle portion 11 to increase the strength. Specifically, the lower support plate 38 in FIG. 4 is formed in a shape surrounding the powder receiver 24 protruding forward from the lower end of the main blackboard 1. That is, the lower support plate 38 is separated from the powder receiver 24 and is formed in a shape that does not collide with the powder receiver 24. The lower support plate 38 that does not interfere with the powder receiver 24 is provided below the handle portion 11, so that the movable body 10 collides with the powder receiver 24 even when the movable body 10 is moved horizontally by pulling the handle portion 11 left and right. Move smoothly without In the blackboard device 100 according to the first embodiment, the lower placing shelf 16 is connected to the lower support plate 38 and the horizontal movement of the lower placing shelf 16 can be controlled by the handle portion 11. Hereinafter, the lower shelf 16 will be described.

(Lower shelf)
The lower shelf 16 has a placement surface 16 a on which the video source supply device can be placed, and can move substantially horizontally along the lower end of the main blackboard 1 in conjunction with the handle 11. In the first embodiment, a personal computer PC is employed as the video source supply device. Specifically, as shown in FIG. 1, when the user pulls the handle portion 11 in the left-right direction, the personal computer PC fixed to the lower placing shelf portion 16 moves substantially horizontally along the lower end of the main blackboard 1. Further, the lower shelf 16 can be deformed, and when used, the lower shelf 16 can be assembled so that the mounting surface 16a protrudes forward, while when not in use, FIGS. As shown in Fig. 2, it can be folded compactly and stored without getting in the way. A personal computer can be mounted on the protruding mounting surface 16a for convenient use.

  FIGS. 7 a, 7 b, 8 a, and 8 b are partially enlarged views of the blackboard device 100, and are explanatory views for explaining the deformation of the lower shelf 16. Specifically, FIGS. 7a and 7b are partially enlarged views of the lower part when the blackboard apparatus 100 is viewed from the side, and FIGS. 8a and 8b are partially enlarged views of the lower part when the blackboard apparatus 100 is viewed from the front. It is.

  As shown in FIGS. 7 a and 7 b, the lower placing shelf portion 16 is provided below the moving body 10, and specifically, is fixed to the lower end surface of the lower support plate 38 of the handle portion 11. 7b has the mounting surface 16a projecting in a substantially normal direction of the main blackboard 1, while the lower mounting shelf 16 in the assembled state shown in FIG. 1 in a posture parallel to 1 and placed behind the main blackboard 1.

  The blackboard device 100 includes a joint portion 57 that is connected to the lower end surface 10 a of the moving body 10 and connects the moving body 10 and the lower shelf 16. The lower shelf 16 is connected to the fixed base portion 54 fixed in a vertically suspended manner from the lower end surface 57a of the joint portion 57 and the front end surface 57b of the joint portion 57, and rotates in a substantially vertical direction. A table portion 55 and a table support panel 56 disposed between the fixed base portion 54 and the table portion 55 and capable of maintaining the fixed base portion 54 and the table portion 55 at a predetermined configuration angle are provided. As shown in FIGS. 7b and 8b, the table support panel 56 can be fixed so that the table portion 55 and the fixed base portion 54 are substantially perpendicular to each other in the assembled state.

  The shape of the fixed base portion 54 is not particularly limited, but the fixed base portion 54 in FIGS. 7a, 7b, 8a, and 8b has a flat plate shape, and a plane of the fixed base portion 54 as shown in FIGS. 7a and 7b. The main surface 54a is fixed so as to be substantially horizontal with the front surface of the main blackboard 1. The table support panel 56 is rotatably connected to the main surface 54a of the fixed base portion 54. The table support panel 56 of FIGS. 7a, 7b, 8a, and 8b has a flat plate shape, and as shown in FIG. 7b, the first hinge means can take a posture substantially orthogonal to the fixed base portion 54. It is connected to the fixed base portion 54 via 58. Specifically, the side end surface 56a constituting the thickness of the table support panel 56 is connected to the main surface 54a of the fixed base portion 54 via the hinge means 58. Therefore, the table support panel 56 is fixed to the fixed base portion 54. On the other hand, it can be displaced from a substantially parallel overlapping posture shown in FIG. 7a to a posture orthogonal to the normal direction shown in FIG. 7b.

  However, the connection means between the table support panel 56 and the fixed base portion 54 is not limited to the above-described means, and various methods can be adopted. For example, the fixed base portion 54 is formed in a rod shape, and the side end surface 56a of the table support panel 56 is formed to be slidable around the fixed base portion 54, and the table support panel 56 is rotated around the fixed base portion 54 as a central axis. It may be possible. Further, the table support panel 56 includes at least one corner portion CR configured substantially at a right angle. The substantially right-angled portion CR of the table support panel 56 is disposed close to the joint portion 57. Thereby, the corner | angular part CR of the table support panel 56 can be arrange | positioned between the fixed base part 54 and the table part 55, and the fixed base part 54 and the table part 55 can be maintained at a substantially right angle. On the other hand, the table portion 55 is rotatably connected to the front end of the joint portion 57 via the second hinge means 58. The table portion 55 can be rotated in the vertical direction around the connecting portion with the second hinge means 58, and the mounting surface 16 a of the table portion 55 is substantially parallel to the main surface of the main blackboard 1. It can be deformed into a state protruding in a substantially normal direction.

  Further, the lower shelf 16 is arranged in the order of the table portion 55, the fixed base portion 54, and the table support panel 56 from the front to the rear of the blackboard device 100 as shown in FIGS. 7a and 7b. In the stored state, as shown in FIGS. 7a and 8a, the flat table portion 55 and the table support panel 56 are folded in contact with the fixed base portion 54 while overlapping with each other in a posture substantially parallel to the front surface of the main blackboard 1. ing. On the other hand, when using the lower shelf 16, the user lifts the front end of the table portion 55 from the lower side to the upper side from the stored state of FIGS. 7 a and 8 a to rotate the table portion 55 upward. Then, with the table portion 55 protruding forward from the main blackboard 1, the table support panel 56 is further rotated in a substantially horizontal direction to protrude forward, and the table portion 55 is placed on the upper end surface 56b of the table support panel 56. Place. That is, the upper end surface 56 of the table support panel 56 is brought into contact with the back surface 55 b of the table portion 55. Since the upper end surface 56b of the table support panel 56 forms a substantially right angle with the side end surface 56a, the configuration angle between the table portion 55 and the fixed base portion 54 along the respective end surfaces 56b, 56a can be made a substantially right angle. As a result, the mounting surface 16a of the table portion 55 can be maintained in a posture protruding in a substantially normal direction of the main blackboard 1 while supporting the table portion 55 from below with the table support panel 56. The personal computer PC can be placed on the placement surface 16a. When the lower shelf 16 is stored, the above assembly procedure may be performed in reverse order.

(wiring)
Further, the projector PJ and the personal computer PC are respectively fixed to the upper end and the lower end of the main blackboard 1 as shown in FIG. Accordingly, as shown in FIG. 14, the wiring HS that connects these projectors PJ and the personal computer PC is arranged so as to cross the main blackboard 1 up and down. By allowing the wiring HS to be stored in the handle portion 11 or the cable storage body that is interlocked with the moving body 10 as shown in FIG. 7B, the wiring HS is not exposed and does not get in the way. That is, the wiring HS can be prevented from hanging down on the front surface of the main blackboard 1, and the front surface of the main blackboard 1 can be easily seen. Further, the blackboard device 100 in which the wiring HS is not exposed can reduce the failure and improve the design because the wiring HS is not caught or soiled.

  In particular, the blackboard device 100 that interlocks the upper shelf 15 and the lower shelf 16 with each other can move the upper shelf 15 and the lower shelf 16 in the same amount. It is possible to maintain a constant wiring length without changing the wiring length. Therefore, in the case of the conventional blackboard device, either one of the accessory devices, that is, the personal computer PC is fixed, and only the other accessory device, that is, the projector PJ moves, so that the wiring HS is pulled and displaced by the other accessory device that moves. On the other hand, in the blackboard device 100 according to the first embodiment, the wiring HS does not expand or contract and is not disturbed. Furthermore, it is preferable to provide a cable storage body between the accessory devices because the wiring is not exposed and is protected by the cable storage body, and is not easily damaged.

  Further, the power cord DC of the personal computer PC in FIG. 1 is connected to an external power source to supply power to the personal computer PC. The power cord DC is preferably a telescopic type, for example, a curled cord. Extendable power cord DC is easy to adjust the length. In addition, the curl cord has the shortest overall length in the contracted state and is stretched according to the required amount, so that the overall length can be limited to the minimum necessary. Moreover, the total length of the power cord DC can be reduced by arranging the socket into which the plug is inserted close to the blackboard device 100. Alternatively, the power cord DC may be a winding type. The blackboard device 100 that uses the power cord DC of the personal computer PC as a winding type can draw out or wind the power cord DC according to the amount of movement of the moving body 10. The blackboard device 100 that can adjust the length of the cord can be conveniently used with fewer wires to be exposed.

  The blackboard device 100 may further include another accessory device. As the accessory device, an electric device or an apparatus that does not need to supply power can be used. Examples of the electric equipment include an electric cleaner, a scanner, a sensor, a printer, and a computer. Non-electrical equipment includes a drawer-type storage box that stores equipment such as chalk, pens, and a blackboard eraser, and a hook that can secure materials. In addition, the blackboard device according to the first embodiment may be provided with these accessory devices in advance, and is used to include a state in which the accessory device is equipped. Since the blackboard device 100 equipped with the accessory device can fix the accessory device at a position corresponding to the characteristics of the accessory device in advance, the initial setting of the accessory device can be omitted.

(Screen body)
The screen body 4 connected to the moving body 10 is a curtain for projecting characters and images. As the screen body 4, a publicly known one can be adopted, which is a translucent or opaque screen. In addition, a touch screen having an input function capable of directly touching the screen with a finger or a pencil and transmitting the touched position as a signal to a computer can be used. Characters and figures such as a tool picture may be printed in advance on the surface of the screen. The blackboard device 100 of FIG. 3 is provided with a tool box 17 on a part of the screen body 4 in which frequently used functions are displayed as icons. Further, it is assumed that at least a part of the screen body 4 covers the main blackboard 1 and can be maintained in a planar state.

  The screen body 4 according to the first embodiment has a quadrangular shape having a left end 4b and a right end 4a as shown in FIG. The screen body 4 has a winding shaft 4c that becomes a core when winding. The winding shaft 4 c of the screen body 4 is connected to the handle portion 11 of the moving body 10. When winding up the screen body 4, as shown in FIG. 3, the screen body 4 is sequentially wound so as to be wound around the winding shaft 4c from the left end 4b of the screen body with the rotation of the winding shaft 4c. Simultaneously with the winding of the screen body 4, the right end 4a of the screen body moves to the left, and finally the right end 4a of the screen body is positioned on the outermost surface of the roll bundle wound as shown in FIG. To do. When the screen body is expanded again, the right end 4a of the screen body exposed on the outer surface of the roll bundle is pulled to the right side, and the wound screen body is gradually pulled out to form a planar shape as shown in FIG. To spread. The roll-up type screen body 4 can adjust the projection area according to the amount of drawing of the right end 4a of the screen body.

  When winding up and storing the unfolded screen body 4, the screen body 4 is sequentially wound up by reversely rotating the winding shaft 4c of the screen body 4, and the right end 4a of the screen body 4 approaches the left end 4b side. Let The screen body 4 is preferably provided with a spring mechanism for automatic winding. The screen body according to the first embodiment that is wound around the winding shaft includes a spring mechanism that is biased in the winding direction and a detent mechanism that stops winding when the pulling force is weakened. When the screen body stopped by the detent mechanism is further pulled out, the stop is released and the screen body is automatically wound by the spring mechanism.

  The roll bundle of the wound screen body 4 is stored in the storage space 3 shown in FIG. As shown in FIGS. 1 and 6, the wound screen body 4 is positioned in the storage space 3 while being fixed to the moving body 10, that is, on the back side of the moving body 10 and on the main blackboard 1. Is placed in front of. The screen body 4 stored in the storage space 3 can effectively use the gap generated between the main blackboard 1 and the moving body 10. When the screen body 4 is not used, the screen body 4 bundled almost linearly by being completely wound up can be arranged on the back side of the handle portion 11, so that the screen body 4 that is not used does not get in the way. For this reason, the main blackboard 1 can be widely used when the screen body 4 is not used.

(Toolbox)
As shown in FIG. 3, the screen body 4 according to the first embodiment has tool boxes 17a and 17b formed on both sides of the left end 4b and the right end 4a of the screen body 4. Moreover, the screen body 4 is accommodated in a state where a part of the surface is left in the accommodated state as shown in FIGS. That is, the blackboard device 100 sets at least a part of the unrolled region MR even when the screen body 4 is wound up. Specifically, as shown in FIG. 3, the right end 4a side of the screen body 4 is set as the unrolled region MR, and the right tool box 17a is displayed in the unrolled region MR. In other words, even when the screen body 4 is wound up, the right end 4a side is always exposed on the main blackboard 1, and the tool box 17a can be displayed on the main blackboard 1. The tool box 17a in the unrolled region MR can be used even when the screen body 4 is stored. The projector can project not only on the screen body 4 but also on the main blackboard 1. Therefore, as shown in FIG. 1, the screen body 4 can be accommodated and projected onto the main blackboard 1 in a state in which the use area of the main blackboard 1 is enlarged. The image projected on the main blackboard 1 can be operated with the right-side tool box 17a always displayed on the main blackboard 1.

  As shown in FIGS. 1 to 3, the screen body 4 according to the first embodiment can reduce or enlarge the expansion area of the screen body 4 by inserting and removing the right end 4 a to the left and right. However, even if the screen body 4 is in a reduced state, all the screen bodies 4 are not taken up and a part on the right side of the screen body 4 is left. The unrolled region MR of the screen body 4 is left unrolled in an exposed state on the main blackboard 1. The blackboard device 100 that does not wind up a part of the screen body 4 and keeps it in a planar shape and does not store the entire screen body 4 can always make the contents written on a part of the screen body 4 visible. Further, in the case of the screen body 44 incorporating a device that induces a failure due to a shape change, by incorporating the device in the unwinding region MR, damage that may occur due to bending such as winding can be avoided.

  The screen body 4 shown in FIG. 3 is a display screen having an input function that allows the user to directly touch the screen and specify a position. The screen body 4 can exchange signals with the attached device. For example, the computer can also be operated by connecting to a computer PC which is an accessory device and pressing a menu displayed on the screen body 4 with a finger or a pen. The screen body 4 may be an input device that combines a drawing board tablet used in computer graphics and a position pointing tool that moves on the tablet. The screen body 4 may have a structure in which an image or a shape is converted into digital data and at the same time it can be displayed on a CRT screen. In addition, the screen body 4 includes a sensor that detects a physical quantity and a change amount thereof in an unrolled region MR that is not rolled up by storage. The sensor may detect physical quantities such as temperature, pressure, flow rate, light, magnetism, and their changes, and may have a function of converting the detected quantity into an appropriate signal and inputting it into a measurement system. In the example of FIG. 3, sensors are incorporated on both sides of the screen body 4, that is, on the left side and the right side, and the right sensor part is used as an unrolled region MR. An icon such as a tool palette may be displayed on the surface of the screen body 4 on which the sensor is arranged so that a user or a viewer of the blackboard device 100 can easily understand the operation visually.

  The blackboard device 100 that stores the screen body 4 with a part left is provided with a mechanism that limits the amount of winding of the screen body 4 to a predetermined amount. For example, the blackboard device 100 of FIG. 3 is provided with stoppers 40 at the upper and lower portions of the right end 4a corresponding to the leading portion when the screen body 4 is pulled out. Further, a stopper receiver 41 for stopping the stopper 40 is provided at a position away from the moving body 10 by a certain distance. When the screen body 4 is stored, the right end 4a of the screen body moves in a direction approaching the winding shaft 4c. As shown in FIG. 1, when the stopper 40 comes into contact with the stopper receiver 41 and stops, the movement of the right end 4a of the screen body 4 stops. As a result, the winding of the screen body 4 is stopped, and a state in which a part of the screen body 4 is exposed on the main blackboard 1 without being wound can be maintained. Alternatively, the unwinding of the screen body 4 may be achieved by controlling the rotation of winding. The blackboard device 100 that stores the screen body 4 in a state where a part of the screen body 4 remains can always place a part of the screen body 4 on the main blackboard 1. For example, a portion where the tool box 17 is written is used as the unrolled area MR, and the tool box 17 can be always displayed on the main blackboard 1.

  In particular, the blackboard device 100 of the first embodiment is not limited to the screen 4 or the main blackboard 1 as described above, and the projection location can be freely set. Therefore, by displaying the tool box 17 in the unrolled region MR of the screen body 4, even when the screen body 4 is wound up, an image projected directly on the main blackboard 1 can be displayed in the tool box 17. Can be controlled through. That is, it is not necessary to unfold the screen body 4 every time it is projected, it is possible to project the image on the main blackboard 1 and to operate this image with the tool box 17. Hereinafter, the opening / closing mechanism of the screen body 4 will be described in detail.

(Screen body opening and closing mechanism)
The blackboard apparatus 100 according to the first embodiment can install the screen body 4 at a free position by moving the screen body 4 in two stages as shown in FIGS. First, in the first stage, the entire screen body 4 bundled is moved by the moving body 10. In the second stage, the screen body 4 is developed by pulling out the right end of the screen body 4. In the second stage, the amount of expansion of the screen body 4 can be arbitrarily adjusted according to the amount of withdrawal of the screen body 4. By moving the screen body in two stages in this way, the screen body 4 can be expanded to a free position on the main blackboard 1 and to an arbitrary width. The blackboard device 100 that can freely distribute the screen body 4 and the main blackboard 1 can conveniently use both the screen body 4 and the main blackboard 1. Hereinafter, the installation method of the screen body 4 is demonstrated concretely using figures.

  First, the moving body 10 in FIG. 1 is moved to the left and right together with the screen body 4 and the support rod 5, and the moving body 10 is stopped at a desired position as shown in FIG. The stop position of the moving body 10 corresponds to the left end 4b of the screen body. The right end 4a of the screen body 2 is pulled to the right from the stop position of the moving body 10, and the screen body 4 is developed as shown in FIG. That is, the stop position of the movable body 10 that can move freely becomes the reference position when the screen body 4 is expanded, and the screen body 4 is expanded from the reference position to the right side. The screen body 4 whose development amount is adjusted in accordance with the amount of drawing at the right end of the screen body 4 is arranged on the main blackboard 1 while maintaining the expanded width. Furthermore, this screen body 4 can move the main blackboard 1 freely horizontally while maintaining the unfolded width by moving the moving body 10 in the unfolded state. That is, the blackboard device 100 can freely change the installation position of the screen body 4 even after the screen body 4 is adjusted to a desired development amount. The blackboard device 100 that can move the screen body 4 in the unfolded state is convenient because the use area of the main blackboard 1 that is used simultaneously with the screen body 4 can be appropriately changed. For example, the screen can be used while writing on the main blackboard 1 with chalk or a pen, and the position of the screen can be changed according to the position and quantity of the blackboard, making it much easier to use than conventional fixed screens. Can be improved.

(Deployment maintenance mechanism)
Further, a deployment maintaining mechanism that maintains the deployed state of the screen body 4 may be provided. For example, a magnetic material is applied to the back surface of the screen body 4, a magnet of another member is added to the back surface, or the magnet is placed at an arbitrary position from the front surface side. With such a magnet type, the screen body 4 is stuck to the surface of the main blackboard 1 with a magnetic force. Alternatively, a hook-and-loop fastener, an adhesive tape, a hook, or the like can be used. By sticking the screen body 4 to the front surface of the main blackboard 1 through such a deployment maintaining mechanism, the expanded state of the screen body 4 is maintained. Thereby, the unfolded screen body 4 is prevented from shaking due to wind or contact, and the projected image displayed on the screen body 4 can be stably viewed. Moreover, the mounting area of the deployment maintenance mechanism in the screen body 4 is not particularly limited. For example, in the screen body 4 in which the magnet mounting area is only a part of the screen body 4, for example, the four corners of the screen body 4, the area where the unfolded screen body 4 and the main blackboard 1 are attached is reduced, and the attractive force Can be reduced. The screen body 4 having a limited suction force with the main blackboard 1 can be moved lightly and horizontally while maintaining the unfolded state, and can be smoothly wound up and stored easily. Alternatively, a magnetic material may be applied to the entire back surface of the screen so that it can be completely fixed.

  Further, the deployment maintaining mechanism is not limited to the method of fixing on the main blackboard 1, but can be provided so as to be fixed to the moving body 10 or other parts. For example, the upper horizontal movement mechanism or the lower horizontal movement mechanism is provided with a support bar that can move together with the moving body, and the tip of the screen body can be connected to the support bar in a state where the screen body is fully deployed. By connecting the upper and lower sides of the screen body to the support rod, the unfolded state of the screen body is maintained, and the screen body can be moved left and right along the vertical movement mechanism while being unfolded. Also, with this configuration, since the unfolded state of the screen body is maintained, sagging and shaking of the screen body are suppressed, and an image displayed on the screen body can be stably displayed. For the connection between the screen body and the support bar, for example, a method of fixing to the support bar with a magnet provided at the tip of the screen body can be adopted. In addition, the support bar can be configured to expand and contract in accordance with the developed width of the screen body, so that the screen can always be stretched up and down, and the screen body pulled out to a desired width can be maintained in the deployed state. Can move to any position.

(Deployment maintenance panel)
Specifically, the above-described deployment maintenance mechanism will be described in detail with reference to the drawings. The blackboard device 100 of FIGS. 1 to 3 can maintain the unfolded state of the screen body 4 by locking the top of the screen body 4 pulled out when the screen body 4 in the housed state is unfolded on the main blackboard 1. . The blackboard device 100 includes a deployment maintenance panel 60 as a deployment maintenance mechanism. The unfolding maintenance panel 60 is configured to be fixed at a desired position of the main blackboard 1 by being connected to the front surface of the main blackboard 1 so as to be movable in a substantially horizontal direction in a substantially vertical posture, like the moving body 10. The unfolding maintenance panel 60 is fixed so as to cover the lower end surface of the main blackboard 1. Specifically, the unfolding maintenance panel 60 has a bent portion 2f that is bent rearward from the lower end of the unfolding maintenance panel 60. Connected in contact with the lower end surface. The bent portion 2f of the deployment maintaining panel 60 can have the same structure as that of the moving body 10, and for example, the lower support plate 38 described above can be used. The screen body 4 can be maintained in the unfolded state by locking the leading end of the screen body 4 to the unfolding maintenance panel 60.

  The deployment maintenance panel 60 is located on the deployment direction side of the screen body 4 from the handle portion 11 of the moving body 10, that is, on the right side in the example of FIGS. The unfolding maintenance panel 60 can be moved substantially horizontally independently of the moving body 10, and can be moved close to or away from the handle portion 11 by moving left and right. When installing the screen body 4 on the main blackboard 1, as shown in FIG. 1, first, before the screen body 4 is expanded, the amount of expansion of the screen body 4 is predicted in advance, and the head portion of the screen body 4 is positioned. The deployment maintenance panel 60 is arranged in the area to be developed, and then, as shown in FIG. 3, the top portion of the screen body 4 is pulled to the deployment maintenance panel 60 arrangement position, and then the deployment maintenance panel 60 is engaged. Stop.

  By positioning the unfolding maintenance panel 60 at an arbitrary distance from the handle portion 11 and pulling out the screen body 4 to the unfolding maintenance panel 60, the unfolding amount of the screen body 4 can be made freely. The locking means between the head portion of the screen body 4 and the development maintaining panel 60 is not particularly limited. In the example of FIGS. 1 to 3, only the top of the screen body 4 is a magnet type, and the development maintaining panel 60 is made of metal, and the top of the screen body 4 is stuck to the deployment maintenance panel 60 and locked. Yes. Further, the width of the unfolding maintenance panel 60 is not particularly limited, but by increasing the width, it is possible to earn a contact area with the head portion of the screen body 4 and increase the attractive force. As a result, the screen body 4 is firmly arranged on the main blackboard 1 via the development maintaining panel 60. On the other hand, the development maintaining panel 60 having a small width can be easily moved because it can be lightened as a whole, and the load on the main blackboard 1 to be connected can be reduced.

  Only the top part of the screen body 4 is attached to the unfolding maintenance panel 60 and arranged on the main blackboard 1 so that the screen body 4 can be easily moved horizontally while maintaining the unfolded state. This is because the screen body 4 is arranged on the main blackboard 1 via the unfolding maintenance panel 60, that is, the screen body 4 is not directly attached to the main blackboard 1. This is because it does not become an obstacle and can be moved lightly.

(Lock mechanism)
Furthermore, the blackboard device 100 can include a lock mechanism 61 that can temporarily connect the deployment maintaining panel 60 and the moving body 10. Further, the lock mechanism 61 can maintain a constant separation distance between the deployment maintaining panel 60 and the handle portion 11. As a result, it is possible to avoid the head portion from approaching the handle portion 11 side when the unfolded screen body 4 tries to unwind. That is, in the example of FIGS. 1 to 3, it is possible to avoid the leading portion of the screen body 4 and the unfolding maintenance panel 60 locking the screen body 4 from moving to the left, and the unfolded state of the screen body 4 can be reliably maintained.

  Specifically, in the blackboard device 100 of FIG. 3, the unfolding maintenance panel 60 is fixed to the upper placing shelf 15 via the lock mechanism 61 at a position where the head portion of the fully opened screen body 4 can be locked. In other words, the deployment maintaining panel 60 is restrained from horizontal movement by the lock mechanism 61 at a position separated from the handle portion 11 by the substantially entire width of the screen body 4. That is, since the deployment maintaining panel 60 cannot be moved horizontally by the lock mechanism 61, the deployment maintaining panel 60 does not approach or separate from the handle portion 11 and always maintains a substantially constant separation distance. Therefore, the development amount of the screen body 4 is also maintained and the fully open state can be maintained. Furthermore, the deployment maintaining panel 60 is connected to the moving body 10 via the lock mechanism 61. Therefore, when the movable body 10 is pulled to the left and right, the deployment maintaining panel 60 is interlocked and moves to the left and right together with the movable body 10 while maintaining the separation distance from the handle portion 11. As a result, the screen body 4 can be moved to an arbitrary position on the main blackboard 1 with the screen body 4 in the unfolded state.

  In more detail, the upper placing shelf 15 of the moving body 10 in FIG. 3 approximates the full width in the horizontal direction to the full width of the screen body 4. Precisely, the width of the upper shelf 15 is determined so that the substantially entire length of the upper shelf 15 and the deployment maintaining panel 60 is the entire width of the screen body 4 in the horizontal direction. Then, as shown in FIG. 3, in a state where the upper shelf 15 and the deployment maintaining panel 60 are adjacent to each other, that is, in a state where the right end of the upper shelf 15 is aligned with the left end of the deployment maintaining panel 60. Both are connected via a mechanism 61. The lock mechanism 61 is not particularly limited, and a known means can be used.

  Further, when the lock by the lock mechanism 61 is released, the deployment maintenance panel 60 can move independently of the moving body 10 as described above. The blackboard device 100 according to the first embodiment includes a plurality of rails extending in a substantially horizontal posture along the upper end of the main blackboard 1, and the development maintaining panel 60 and the movable body 10 can be slid on the rails. Link. Thereby, the deployment maintaining panel 60 and the moving body 10 are guided by the rails and can move independently in the horizontal direction without contacting each other. Hereinafter, a horizontal movement mechanism that moves the moving body 10 and the deployment maintaining panel 60 substantially horizontally will be described.

(Horizontal movement mechanism)
In the blackboard device 100 of FIG. 1, rails 7 and 27 are arranged on the upper and lower parts of the main blackboard 1, respectively. The upper rail 7 is provided in a substantially horizontal direction along the upper end of the main blackboard 1, while the lower rail 27 is provided in a substantially horizontal direction along the lower end of the main blackboard 1. The upper ends of the moving body 10 and the deployment maintaining panel 60 are slidably connected along the upper rail 7, and the lower ends of the moving body 10 and the screen body 4 are slidably connected to the lower rail 27. is doing. The blackboard apparatus 100 of FIG. 1 is provided with a plurality of rails, and the movable body 10 and the unfolding maintenance panel 60 are connected to each rail. Below, the horizontal movement mechanism in the upper part of the main blackboard 1 is demonstrated.

(Upper horizontal movement mechanism)
9 is a cross-sectional view in which the upper part of the blackboard device 100 is partially enlarged along the line VI-VI ′ of FIG. 1, and FIG. 10 is a partial view of the lower part of the blackboard device 100 along the line VI-VI ′ of FIG. It is expanded sectional drawing. However, in the blackboard device 100 of FIGS. 9 and 10, in order to easily understand the upper or lower horizontal movement mechanism, the movable member with respect to the main blackboard 1 is given a right-upward hatching, The non-moving member together with the main blackboard 1 is hatched downward to distinguish the static and moving members. As shown in FIG. 9, the upper rail 7 is composed of a first rail 7a and a second rail 7b arranged substantially in parallel in the front-rear direction. The moving body 10 is connected to the front first rail 7a, and the development maintaining panel 60 is connected to the rear second rail 7b. The first rail 7a and the second rail 7b have independent guide grooves 21a and 21b, respectively. Therefore, the movable body 10 and the deployment maintaining panel 60 do not interfere with each other.

  The first rail 7a can position the screen body 4 by sliding the moving body 10 in the horizontal direction. Further, the second rail 7b can slide the unfolding maintenance panel 60 in the horizontal direction and fix the right end 4a of the screen body 4 thereto. That is, the first rail 7a is responsible for positioning the screen body 4, and the second rail 7b can freely determine the amount of the screen body 4 to be pulled out.

  Further, the first rail 7a and the second rail 7b have a U-shaped cross-section that opens downward, and the upper end surface that is closed in the example of FIG. 9 is substantially the same height as the upper end surface 1a of the main blackboard 1. It is connected to the main blackboard 1 in such a posture. The first rail 7a has a guide first groove 21a disposed in the opening and extending in the horizontal direction. A first slide portion 23a that is guided by the first guide groove 21a and can be moved horizontally is connected to the moving body 10 so that the moving body 10 can move horizontally while being guided by the first guide groove 21a. . Similarly to the first rail 7a, the second rail 7b has a second guide groove 21b disposed in the opening and extending in the horizontal direction. A second slide portion 23b that is guided by the second guide groove 21b and can move horizontally is connected to the deployment maintaining panel 60. As a result, the deployment maintenance panel 6 moves the second slide portion 23b to the second slide portion 23b. It can move horizontally along the second guide groove 21b.

  Moreover, the upper shelf part 15 connected to the attitude | position bent backward at the upper end of the handle | steering-wheel part 11 is connected with the upper end surface 1a of the main blackboard 1 in the back part, as shown in FIG. Specifically, it has an upright wall 26 bent upward at the rear end of the upper shelf 15. The upright wall 26 is fixed to the upper end surface 1 a in a posture orthogonal to the upper end surface 1 a of the main blackboard 1. On the upper end face 1a of the main blackboard 1, a third rail 7c having a U-shaped cross section opened upward is continuously arranged in a substantially horizontal direction, and slides inside the opening of the third rail 7c. A possible third slide is connected to the lower end of the upright wall 26. Therefore, the upright wall 26 is guided by the third rail 7 c and can move horizontally while maintaining a vertical posture with respect to the upper end surface 1 a of the main blackboard 1. As a result, the upper shelf part 15 can be maintained in a substantially parallel posture with respect to the front surface of the main blackboard 1, and the upper shelf part 15 is prevented from tilting back and forth.

(Downward horizontal movement mechanism)
Moreover, as shown in FIG. 1, the blackboard apparatus 100 of Example 1 has the lower end of the moving body 10 and the expansion | deployment maintenance panel 60 each slidably connected with the rail 27 of the lower part. The blackboard device 100 of FIG. 1 is provided with one lower rail 27 at the lower end of the main blackboard 1, so that the moving body 10 and the unfolding maintenance panel 60 are connected to the common lower rail 27. The lower rail 27 is provided on the lower end surface 1b of the main blackboard 1 as shown in FIG. The movable body 10 and the deployment maintaining panel 60 are each connected to the lower rail 27 via the lower support plate 38. Hereinafter, the lower horizontal movement mechanism will be described with reference to FIG. 10 by taking the lower support plate 38 connected to the deployment maintaining panel 60 as an example. However, this horizontal movement mechanism can also be applied to the lower support plate 38 connected to the moving body 10.

  The lower support plate 38 is slidably connected to the lower end surface 1 b of the main blackboard 1. The lower support plate 38 has a substantially U-shaped cross section, and has an upper plate 38a and a lower plate 38b that are separated from each other. The powder receiver 24 is disposed inside the U-shaped cross section of the lower support plate 38. Specifically, the powder receiver 24 is in a state where the upper and lower plates 38a and 38b of the lower support plate 38 are separated without contacting the powder receiver 24. Cover the top and bottom surfaces. Thereby, the lower support plate 38 can move smoothly without being interfered with the powder receiver 24.

  The lower support plate 38 is connected to the lower end of the deployment maintaining panel 60 in a substantially vertical posture in a direction perpendicular to the deployment maintaining panel 60. The lower support plate 38 can be moved substantially horizontally through the lower rail 27 while maintaining a posture substantially parallel to the lower end surface 1 b of the main blackboard 1. As a result, the deployment maintaining panel 60 is maintained in a substantially vertical posture by the lower support plate 38 maintained in a substantially constant posture, that is, while avoiding tilting back and forth with respect to the main blackboard 1. Can move lightly. Hereinafter, the lower rail 27 in FIG. 10 will be described.

  First, a fourth rail 27 a having a U-shaped cross section having a guide groove is fixed to the lower end of the main blackboard 1. On the other hand, the lower plate 38b of the lower support plate 38 has a tip positioned below the main blackboard 1, and a fourth slide portion 23d is provided at the tip. Then, the fourth support portion 38d of the lower support plate 38 slides while being guided by the fourth rail 27a on the main blackboard 1 side, so that the lower support plate 38 extends along the lower end surface 1b of the main blackboard 1. Can move. As a result, the development maintaining panel 60 connected to the lower support plate 38 is interlocked substantially horizontally. Further, the deployment maintaining panel 60 can fix the right end 4a of the screen body 4 via a mounting member 39 such as a magnet. In particular, since the deployment maintaining panel 60 can maintain a substantially parallel posture with respect to the main blackboard 1, it can be maintained substantially parallel to the main blackboard 1 while preventing sagging of the screen body 4 to be fixed.

  However, the horizontal moving mechanism for moving the moving body 10 or the deployment maintaining panel 60 substantially horizontally is not limited to the above-described means, and a known method can be adopted. For example, in the horizontal movement mechanism described above, a plurality of rails are provided above and below the main blackboard 1 and used as means for connecting the moving body 10 or the unfolding maintenance panel 60 thereto. If it can be firmly connected so as not to fall, it may be a single horizontal movement mechanism.

  The blackboard device provided with the movable screen of the present invention can be suitably applied to a school blackboard or an overhead projector.

DESCRIPTION OF SYMBOLS 1 ... Main blackboard 1a ... Upper end surface 1b ... Lower end surface 2e, 2f ... Bending part 3 ... Storage space 4 ... Screen body 4a ... 1st edge part (right edge) 4b ... 2nd edge part (left edge) 4c ... Winding Take-up shaft 5 ... support rod 5a ... upright part 5b ... extension part 5c ... first pipe 5d ... second pipe 7 ... upper rail 7a ... first rail 7b ... second rail 7c ... third rail 8 ... Attachment member 8a ... Standing wall 8b ... Side plate 8c ... Top plate 10 ... Moving body 10a ... Lower end surface 11 ... Handle portion 13 ... Placing shelf 14 ... Rod reinforcing member 15 ... Upper racking portion 15a ... Placing surface 15b Flat plate 16 ... Lower placement shelf 16a ... Mounting surface 16b ... Lower flat plate 17 ... Tool box 17b ... Right tool box 17a ... Left tool box 18 ... Reflector 18a ... Mirror surface 21a ... First guide groove 21b ... Second Guide groove 23a ... No. Slide part 23b ... second slide part 23c ... third slide part 23d ... fourth slide part 24 ... powder receiver 26 ... upright wall 27 ... lower rail 27a ... fourth rail 38 ... lower support plate 38a ... Upper plate 38b ... Lower plate 39 ... Mounting member 40 ... Stopper 41 ... Stopper receiver 51 ... Projection window 52 ... Fastening member 53 ... Through hole 54 ... Fixed base portion 54a ... Main surface 55 ... Table portion 55b ... Back surface 56 ... Table support panel 56a ... Side end face 56b ... Upper end face 57 ... Joint part 57a ... Lower end face 57b ... Front end face 58 ... Hinge means 60 ... Deployment maintenance panel 61 ... Lock mechanism 100 ... Blackboard apparatus 200 ... Blackboard apparatus 201 ... Main blackboard 202 ... Moving body 204 ... Screen 205 ... Support rod CR ... Corner DC ... Power cord HS ... Wiring IS ... Position detection means MR ... Unwinding area PC Video source supply device (personal computer)
PJ ... Projector
WL ... wall

Claims (7)

Main blackboard (1),
A moving body (10) coupled in a slidable manner along the front surface of the main blackboard (1);
A blackboard device comprising:
The moving body (10)
As the slidable shelf (13) the end face of the main blackboard (1),
In a posture facing the upper end surface (1a) of the main blackboard (1), a planar upper shelf (15) that can move substantially horizontally along the upper end surface (1a),
In a posture facing the lower end surface (1b) of the main blackboard (1), a planar lower shelf (16) that can move substantially horizontally along the lower end surface (1b),
A shelf (13) having
In the vertical posture spaced so as to form a space between the front surface of the main blackboard (1), fixed between the upper placing shelf (15) and the lower placing shelf (16) so as to be orthogonal thereto. The rod-shaped handle portion (11) made,
A rod-like support rod (5) having a tip projecting forward from the main blackboard (1);
A roll-up screen body (4) that can be placed on the front of the main blackboard (1);
Have
The upper shelf (15) is capable of fixing a reflective projection device capable of projecting an image on the main blackboard,
At the tip of the support rod (5), a reflector (18) capable of reflecting at least a part of light emitted from the projection device to the main blackboard (1) side is fixed,
By the operation of the handle portion (11), the upper end surface (1a) and the lower end surface (1b) of the main blackboard are held between the upper placing shelf portion (15) and the lower placing shelf portion (16). By sliding the movable body (10) substantially horizontally, the projector and the screen body (4) installed on the upper shelf (15) are integrated with the main blackboard (1). A blackboard device characterized by being movable along the surface of the board. A blackboard device according to claim 1,
The screen body (4) urges the winding shaft (4c) in the winding direction around the winding shaft (4c), and the screen is in a winding state against the urging force. It can be deployed by pulling out the first end (4a) of the body (4) horizontally,
The amount of expansion of the screen body (4) can be arbitrarily set by the amount of withdrawal of the screen body (4),
Further, as a deployment maintaining mechanism for holding the first end (4a) of the screen body (4) and maintaining the deployed state of the screen body (4), it is the same as the moving surface of the movable body (10). In a state where the first end (4a) of the screen body (4) is held while being movable independently of the moving body (10) along the moving surface, the moving body (10) A blackboard apparatus comprising a deployment maintaining panel (60) which is movable together. The blackboard device according to claim 2,
The blackboard device, wherein the lower shelf (16) is electrically connected to the projection device, and a video source supply device for supplying a video source displayed by the projection device can be fixed. A blackboard device according to claim 3,
The screen body (4) has a first end portion (4a) and a second end portion (4b) fixed to the winding shaft (4c), with respect to the video source supply device. A blackboard device comprising a tool box (17) in which icons for sending arbitrary position information designated on the screen body (4) are displayed. A blackboard device according to claim 4,
The lower placing shelf (16) includes a folding placement surface (16a) for placing the video source supply device,
The mounting surface (16a) is
When not in use, it is deployed in a vertical position so that it is substantially flush with the main blackboard,
A blackboard device, wherein the blackboard device is configured to be bent in a substantially horizontal plane when used and to be held in a horizontal posture. A blackboard device according to claim 5,
The handle (11) of the movable body (10) is a storage space for storing a space formed between the front surface of the main blackboard (1) in a state where the screen body (4) is wound up. (3) A blackboard device characterized by comprising: The blackboard device according to claim 6,
The handle (11) of the movable body (10) has a hollow inside,
A blackboard device characterized in that the wiring of the projection device can be inserted into the hollow inside of the handle portion (11).

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