JP4249811B2 - Projection screen mounting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is mainly for attaching a projection screen for projecting an overhead projector (hereinafter referred to as OHP) to an electronic blackboard having a board-like blackboard and a reading device that runs and scans on the blackboard. Relates to the device.
[0002]
[Prior art]
Conventionally, presentations have been performed using two devices, an electronic blackboard and an OHP, but there is a problem that the space occupied by the devices becomes large.
[0003]
Therefore, a technique has been proposed in which OHP is projected on an electronic blackboard to reduce the installation area of the apparatus and increase the efficiency of presentation.
[0004]
Some electronic blackboards using a looped film use a film in which a writing layer and an OHP projection layer are combined, and directly project OHP onto this film. (Japanese Patent Laid-Open No. 63-138861)
[0005]
[Problems to be solved by the invention]
However, when this technology is used for an electronic blackboard of a type using a board, the following problems have occurred.
[0006]
Since this type of blackboard is horizontally long and is smaller than the size of the sheet for projecting OHP, there is a problem in that it is inaccurate to use for a presentation because the screen is small because it is projected directly on a blackboard. It was.
[0007]
For this reason, it is conceivable to enlarge the blackboard itself, but it is not an effective means in terms of cost.
[0008]
Also, if the axis for simply attaching the projection screen is attached to the blackboard, the reading device for reading will be obstructed, so the reader must be moved to the edge of the blackboard or the reading device itself must be removed. There was a problem of not becoming.
[0009]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a projection screen mounting device that enables easy installation of a projection screen on an electronic blackboard using a board-like blackboard.
[0010]
[Means for Solving the Problems]
The present invention includes the following means in order to solve the above-described problems.
[0011]
According to the first aspect of the present invention, a pair of shaft holding portions fixed to the back side of the blackboard on the electronic blackboard, and the pair of shaft holding portions are each slidably held in the vertical direction. A pair of holding shafts formed in an L-shaped cylindrical shape so as to be positioned on the front surface side, a horizontally long box for storing a projection screen disposed on the front surface of the board, and tip ends of upper ends of the pair of holding shafts And a pair of mounting portions for positioning the pair of holding shafts with respect to the longitudinal direction of the box. A groove portion is provided along the direction, and the pair of attachment portions have a circumferential surface portion for sandwiching the cylindrical holding shaft along the cylindrical circumferential surface, and the circumferential surface portion is fitted into the groove portion , respectively. Protrusions are provided, and the pair of holding shafts are A projection screen mounting apparatus characterized by supporting swingably along the box to a surface of the blackboard via a biasing unit.
[0014]
With this configuration, a groove is provided in the vicinity of the tip of the upper end of each of the pair of holding shafts along the circumferential direction, and the pair of mounting portions are circles that sandwich the cylindrical holding shaft along the cylindrical circumferential surface. The circumferential surface portion is provided with convex portions that are respectively fitted to the groove portions, and the pair of holding shafts passes the box through the pair of mounting portions along the surface of the board. Since the projection screen can be tilted in the longitudinal direction because it is swingably supported, it is not necessary to slide the pair of axes in parallel when the projection screen is moved upward, and it is possible to slide one by one in order. Therefore, even one person can easily install the projection screen, and the operability can be improved.
[0015]
According to a second aspect of the present invention, the pair of holding shafts are each formed with a groove corresponding to the moving length of the pair of holding shafts, and the pair of shaft holding portions includes the pair of holding shafts. 2. The projection screen mounting device according to claim 1, wherein an opening through which the shaft passes and a shaft stopper inserted into a groove of the pair of holding shafts are formed.
[0016]
With this configuration, when the pair of holding shafts are moved up and down, the shaft stopper is inserted into the groove of the holding shaft, so that the holding shaft does not move up and down beyond the length of the groove. Therefore, even if the holding shaft is moved carelessly, the movement is restricted, and the holding shaft does not fall off from the shaft holding portion.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0018]
FIG. 1 is a plan view showing a state in which a projection screen is attached to an electronic blackboard.
[0019]
In FIG. 1, a board 1 has a film for writing with an aqueous pen or the like attached to both sides, so that writing can be performed on both sides. The board 1 is rotatably held by a frame 3 and a pair of support shafts 2 provided on the frame 3, and a stopper 4 provided on the frame 3 prevents the board 1 from rotating at normal times. Is used to prevent the board 1 from rotating.
[0020]
By removing the stopper 4 from the board 1 and rotating the board 1, the writing surface is switched, so that writing can be performed on both sides.
[0021]
Further, the frame 3 is provided with a member for placing a water-based pen (not shown) for writing a line on the board 1, and a sheet stopper 14 for locking the projection screen 13 under the member. Is provided. This member is the same as that used for a normal electronic blackboard.
[0022]
The projection screen 13 has a BOX shape in which a conventional projection screen is stored, and in use, the sheet is pulled out and projected onto the sheet. The projection screen 13 is attached to the holding shaft 11 by a fixture 12.
[0023]
The reading device 5 that reads characters and the like written on the board 1 is in a state of being held by being hooked on the upper part of the frame 3, as instructed by the operation unit 6 of the recording unit 7 provided at the lower part of the frame 3. It has become. This configuration is also similar to the configuration of an electronic blackboard using a conventional self-propelled reader.
[0024]
When instructed by the operation unit 6, the reading device 5 runs on the board 1 to perform reading, and the recording unit 7 outputs the read image to the recording paper.
[0025]
As described above, the frame 3 holding the board 1 or the like is held by the support column 8. The column 7 is provided with a roller 9 for moving the apparatus, and can be easily moved by pushing the apparatus.
[0026]
A holding shaft 11 for supporting the projection screen 13 is held by a shaft holding portion 10 attached to the frame 3. The holding shaft 11 that holds the projection screen 13 has an L-shape, and is configured such that the projection screen 13 is positioned in front of the reading device 5.
[0027]
As described above, since the projection screen 13 is arranged before the reading device 5, the reading device 5 can be operated even when the projection screen 13 is used, so that the operability is improved. be able to.
[0028]
Next, an enlarged view of the projection screen 13 is shown in FIG.
[0029]
The projection screen 13 is the same as a conventional projection screen. Further, the projection screen 13 is provided with a sheet shaft 13a that is an axis for holding the end portion of the sheet, and a metal fitting 13a at the center position of the sheet shaft 13a. The metal fitting 13b is used when pulling the sheet shaft 13a when using the projection screen, or is used for fixing the sheet by being engaged with the sheet stopper 14.
[0030]
Next, FIG. 3 shows a schematic side view of the present apparatus when the projection screen 13 is used.
[0031]
When using the projection screen 13, first, the fitting 13 b provided on the sheet shaft 13 a of the projection screen 13 is pulled, the sheet is pulled out, and the fitting 13 b is locked to the sheet stopper 14.
[0032]
From this state, the holding shaft 11 is extended and fixed. As shown in the drawing, since the projection screen 13 is arranged in front of the reading device 5, the reading operation can be performed even when the projection screen 13 is in use. A person skilled in the art can easily determine how far the projection screen 13 is arranged before the reading device by using a trigonometric function from a position where the sheet is fixed when the projection screen 13 is used. Needless to say, it depends on the balance and design of the device.
[0033]
Next, an enlarged view in which the metal fitting 13b is locked to the sheet stopper 14 is shown in FIG.
[0034]
In FIG. 4, the sheet stopper 14 is provided in the lower center of the frame 3 for placing an aqueous pen or the like. As described above, the sheet stopper 14 is attached to the lower center of the frame 3 for placing an aqueous pen or the like, so that the sheet shaft 13 a comes into contact with the frame 3. Further, the sheet shaft 13 a presses the frame 3 by the force pulled up by the projection screen 13. For this reason, since the sheet shaft 13a is fixed so as to press the frame 3, it is possible to prevent the both end portions of the sheet shaft 13a from fluctuating.
[0035]
Next, an enlarged view of the shaft holder 10 that holds the holding shaft 11 is shown in FIG.
[0036]
In FIG. 5, the shaft holding portion 10 is fixed to the frame 3 by screws 51 and can be removed. Moreover, it has the opening part 52 for hold | maintaining the holding shaft 11, and is comprised by the cylinder shape so that the holding shaft 11 can be penetrated through the opening part 52. As shown in FIG. Further, a shaft stopper 53 for fixing the holding shaft 11 to the shaft holding portion 10 is provided so that the holding shaft 11 does not slide down.
[0037]
The holding shaft 11 is provided with a first groove 54 so as to be locked by a shaft stopper 53. The first groove 54 is configured by a length corresponding to a length by which the holding shaft 11 is slid when the OHP is used, and deeper grooves are provided at both ends thereof.
[0038]
Next, a side sectional view of the shaft holding portion 10 and the holding shaft 11 is shown in FIG.
[0039]
As shown in FIG. 6, the shaft stopper 53 is constituted by a screw. By rotating the shaft stopper 53, the screw portion of the shaft stopper 53 enters the first groove 54. As described above, since the groove for inserting the screw portion of the shaft stopper 53 is provided in the holding shaft 11, the holding shaft 11 can be prevented from rotating when the holding shaft 11 is slid, and the operability is improved. Can be improved.
[0040]
When the projection screen 13 is used, the holding shaft 11 is slid upward until the shaft stopper 52 comes to the end of the first groove 54. Then, since the shaft stopper 52 comes into contact with the end portion 55 of the first groove 54, the holding shaft 11 cannot slide. In this state, the shaft stopper 53 is rotated so that the shaft stopper 53 enters the deeper groove 56.
[0041]
In this way, the length of the groove to be slid when using OHP is provided, and a deeper groove is provided at the end, so it is not necessary to worry about the distance to be slid. Further, it is possible to more reliably prevent the holding shaft 11 from slipping.
[0042]
Next, an enlarged view of the attachment portion 12 for locking the projection screen 13 to the holding shaft 11 is shown in FIG.
[0043]
The projection screen 13 is held by the holding shaft 11 by sandwiching and holding the holding shaft 11 by the first attachment portion 71 and the second attachment portion 72 attached to the projection screen 13.
[0044]
The first mounting portion 71 is provided with a hole 74 for locking the projection 73 of the second mounting portion 72. The projection 73 is passed through the hole, and both mounting portions are screwed. As a result, the holding shaft 11 is sandwiched and held.
[0045]
Further, the second attachment portion 72 is provided with a convex portion 75 toward the first attachment portion 71. The convex portion 75 is inserted into the second groove 76 provided in the holding shaft 11 when the holding shaft 11 is sandwiched between the two attachment portions.
[0046]
A sectional view of the holding shaft 11 to which the projection screen 13 is attached is shown in FIG.
[0047]
As shown in FIG. 8, a convex portion 75 is inserted into the second groove 76 provided in the holding shaft 11, and the convex portion 75 can freely move in the second groove 76. Yes.
[0048]
Needless to say, this configuration is similarly provided on the other side of the projection screen 13.
[0049]
When attaching the projection screen, the user slides one holding shaft upward to fix the holding shaft 11. At this time, since the convex portion 75 moves in the second groove 76 and has a height difference from the other holding shaft 11, the projection screen 13 tends to be inclined.
[0050]
The other holding shaft 11 has a similar configuration, and the projection 75 moves in the second groove 76, so that the projection screen 13 is easily tilted.
[0051]
Thus, since the second groove 76 is provided in the holding shaft 11 that holds the projection screen 13 and the projection screen 13 is held rotatably around the holding shaft 11, when the projection screen 13 is used, There is no need to slide the pair of holding shafts in parallel, and one of the holding shafts can be slid alternately, so that one person can easily install the projection screen.
[0052]
【The invention's effect】
As described above, according to the present invention, it is possible to easily install a projection screen without impairing operability even with an electronic blackboard using a board-shaped blackboard.
[Brief description of the drawings]
FIG. 1 is a plan view illustrating a state in which a projection screen according to an embodiment of the present invention is attached to an electronic blackboard. FIG. 2 is an enlarged view of the projection screen according to the embodiment. FIG. 3 is a projection screen according to the embodiment. FIG. 4 is an enlarged side view of the projection screen fitting in the above embodiment locked to a sheet stopper. FIG. 5 is an enlarged view of the shaft holding portion of the projection screen mounting apparatus in the above embodiment. FIG. 6 is a side sectional view of a shaft holding portion and a holding shaft of the projection screen mounting device in the embodiment. FIG. 7 is an enlarged view of a mounting tool of the projection screen mounting device in the embodiment. Sectional view of the holding shaft of the projection screen mounting device in the form of
DESCRIPTION OF SYMBOLS 1 Board of books 2 Support axis 3 Frame 4 Stopper 5 Reading apparatus 10 Shaft holding part 11 Holding shaft 12 Mounting tool 13 Projection screen 14 Sheet stopper

Claims (2)

A pair of shaft holders fixed to the back side of the blackboard blackboard,
A pair of holding shafts that are slidably held in the vertical direction by the pair of shaft holding portions, and that are formed in an L-shaped cylindrical shape so that the tip of the upper end portion is located on the front side of the board,
A horizontally long box for storing a projection screen disposed in front of the board,
A pair of attachment portions for attaching the top ends of the pair of holding shafts to the upper surface of the box, respectively, and positioning the pair of holding shafts in the longitudinal direction of the box;
With
Grooves are provided in the vicinity of the tips of the upper ends of the pair of holding shafts, respectively, and the pair of attachment portions have circumferential surface portions that sandwich the cylindrical holding shaft along the cylindrical circumferential surface. The circumferential surface portion is provided with convex portions that are respectively fitted in the groove portions, and the pair of holding shafts support the box so as to be swingable along the surface of the board by way of the pair of mounting portions. A projection screen mounting device characterized in that: A groove corresponding to the moving length of each of the pair of holding shafts is formed in the vicinity of the lower ends of the pair of holding shafts along the moving direction.
The pair of shaft holding portions is formed with an opening through which the pair of holding shafts penetrates and a shaft stopper that is inserted into a groove of the pair of holding shafts. Projection screen mounting device.

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