JP3489765B2 - Electronic blackboard - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic blackboard having a back board slidably attached and detached.

[0002]

2. Description of the Related Art In recent years, electronic blackboards having a function of making a hard copy of the contents written on a writing surface have become widespread and are used for presentations at conferences, lectures, and the like. A conventional example of such an electronic blackboard will be described with reference to FIGS.

[Basic Configuration Example of Electronic Blackboard] First, a basic configuration example of an electronic blackboard is shown in FIGS. 4 and 5. Figure 4
It is a perspective view which shows the external appearance structure of the electronic blackboard, and FIG. 5 is a cross-sectional plan view which shows the internal structure.

A frame body 2 supported by a stand 1 and having a rectangular U-shaped cross section is provided. The frame body 2 is made of sheet metal, and has three reinforcing members 3 having a U-shaped cross section in the central portion. The frame 2 is supported by a pair of rollers 4 and rolls when these rollers 4 rotate,
A writing sheet 5 that moves in the left-right direction is provided.
The writing sheet 5 is an endless sheet-like member made of, for example, polyester, and the portion exposed to the outside from the opening 6a on the front surface side of the frame 2 is the writing surface 7. Immediately behind the writing surface 7, a writing board 8 made of plywood or the like is provided in order to ensure the writing performance with respect to the writing surface 7. Further, on the back side of the writing sheet 5, a reduction optical system 9 that optically reads written image information along with the movement of the writing sheet 5 is built in, and the reduction optical system 9 is provided below the frame body 2. A printer 10 for outputting a hard copy of the image information read by is output. And the operation of such an electronic blackboard is
This is executed by a control unit (not shown) controlling each unit based on an input from an operation panel 11 provided near the printer 10 and provided on the frame body 2.

A motor (not shown) is connected to the one roller 4 which supports the writing sheet 5 via a belt transmission mechanism 12. Therefore, when the driving force is transmitted to the one roller 4 via the belt transmission mechanism 12 using the motor as the drive source, the writing sheet 5 moves in the left-right direction. Further, the reduction optical system 9 includes a light source 13 for slit-exposing the surface of the writing sheet 5 on the back side of the roller 4,
It is composed of a mirror 14 and an imaging lens 15 that receive the reflected light from the writing sheet 5, and a photoelectric conversion element 16 such as a CCD that receives the reduced light image by the imaging lens 12. An optical path hole 3a is formed in the reinforcing member 3 provided in the frame body 2 so as not to obstruct the optical path in the reduction optical system 9.

The electronic blackboard having such a structure can be written on the writing surface 7 composed of the writing sheet 5 by using a dedicated magic tool or the like, whereby the function as a blackboard can be achieved. Then, when the writing sheet 5 is driven to roll based on the input operation from the operation panel 11, the writing sheet 5 moves in the left-right direction, and a new surface of the writing sheet 5 appears as the writing surface 7. . At this time, if a hard copy of the image data written on the writing surface 7 is designated by an input operation from the operation panel 11, the information written on the writing surface 7 is reduced by the reduction optical system 9 while the writing sheet 5 moves. Is read by and the printer 5 makes a hard copy.

[Mounting Structure of Back Board] Next, in the electronic blackboard, in order to protect the built-in reduction optical system 9 and other members, the frame body 2 is entirely provided with an opening 6b on the back side thereof. The rear board 17 that covers the target is attached.
The back board 17 needs to be detachably attached in consideration of maintenance and inspection of the reduction optical system 9. In consideration of such a point, in the conventional case, the back board 17 is attached to the frame body 1 by a supporting structure as shown in FIGS. FIG. 6 is a rear view of the electronic blackboard with the stand 1 omitted, and FIG. 7 is a perspective view showing the details of the mounting structure of the rear board 17.

On the back side of the frame body 2, the back board guides 18A, 18B, and
18C and 18D are provided. Each of the back board guides 18A to 18D has a guide rail 19 for slidingly holding the back board 17 and holding the guide rail 19 at a position projecting outward from the frame body 2. The back board guides 18C and 18D positioned above and below are fixed to the upper and lower two sides of the frame body 2 by blind rivet stops 20. In addition, rear board guides 18A located on the left and right,
18B is detachably attached to the two left and right sides of the frame body 2 with screws 21.

When mounting the back board 17, the back board guide 18A on the left side, for example, is mounted by screws 21 together with the back board guides 18C and 18D which are fixed in advance. Then, the rear board 17 is moved from the right side of the frame body 2 to the guide rails 1 of the rear board guides 18B and 18D.
Slide it into 9 and move it to the left side, then back board 1
The left end of 7 is the guide rail 19 of the rear board guide 18A.
Then, the guide rail 19 of the rear board guide 18C is inserted into the right end of the rear board 17 and the rear board guide 18C is fixed by the screw 21. Also,
When performing maintenance / inspection of the reduction optical system 9 etc., loosen the screw 21 and remove the rear board guide 18A or 18B.
The rear board 17 is slid and removed from the frame body 2.

[0010]

The rear board 17 is attachable to and detachable from the frame body 2 in consideration of maintenance and inspection of the reduction optical system 9. In particular, the structure for attaching / detaching the rear board 17 illustrated in FIGS. 5 to 7 is superior to the conventional structure in which the rear board 17 is screwed to the frame 2, for example, in terms of facilitating the attachment / detachment work.

On the other hand, in order to reduce the weight of the entire electronic blackboard, it is desirable to use the back board 17 which is light in weight. Therefore, conventionally, polypropylene or the like is often used as the material of the back board 17. However, in the case of the structure in which the back board 17 is slidably held by the back board guide 18 as illustrated in FIGS. 5 to 7, if the back board 17 having low rigidity such as polypropylene is used, temperature, humidity, and direct sunlight may be increased. There is a problem that the back board 17 is warped under the influence of the above. When the warpage of the rear board 17 becomes remarkable, the rear board 1
There may be a gap between the frame 7 and the frame 7 that allows dust and ambient light to enter the inside of the device. In this case, the reduction optical system 9 is adversely affected, which is extremely inconvenient.

An object of the present invention is to obtain an electronic blackboard which can prevent the back board from warping.

[0013]

According to another aspect of the present invention, there is provided an electronic blackboard having a rectangular frame surrounding a writing sheet and other built-in elements which are rotatably supported, and is reinforced at a central portion thereof. A frame body made of sheet metal provided with a member, a rear board guide attached to the frame body having a guide rail arranged along the frame body at a position projecting outward from the rear surface of the frame body, and a rear board guide A rear board that is slidably supported by the guide rails and covers the rear surface of the frame body, and a warp prevention member that magnetically attracts the central portion of the rear board and the reinforcing member are provided. Therefore, since the central portion of the rear board and the reinforcing member are magnetically attracted to each other, the rear board mounted on the frame body does not warp even when affected by temperature, humidity, direct sunlight and the like. Here, the central portion of the back board means a portion other than the periphery of the back board, and does not necessarily mean only the central portion of the back board.

According to a second aspect of the present invention, in the electronic blackboard according to the first aspect, the warp prevention member is formed by a permanent magnet of 400 to 600 gauss fixed to the rear board at a position facing the reinforcing member of the frame body. Has been done. Therefore, the warp prevention member is easily configured. Also, 400 to 600
The Gaussian permanent magnet provides a magnetic attraction force that prevents the back board from warping and does not hinder the operation of attaching and removing the back board.

According to a third aspect of the present invention, in the electronic blackboard according to the first or second aspect, the reinforcing member has a structure for connecting the upper and lower two sides of the frame body, and the warp preventing member is vertical along the reinforcing member. The shape is elongated in the direction. Therefore, due to the elongated rectangular shape of the warp prevention member, it is possible to easily obtain a magnetic attraction force that can prevent the warp of the rear board,
Moreover, no difficulty is given to the attaching / detaching operation of the rear board that is attached / detached in the left / right direction.

According to a fourth aspect of the present invention, there is provided a frame body made of sheet metal having openings in the front and rear surfaces and having a central portion reinforced by a reinforcing member. The frame body is rollable from the opening on the front side of the frame body. A writing sheet that exposes the held writing sheet as a writing surface and covers the opening on the back side of the frame body with a flat back board that is slidably and detachably attached to the rear surface of the frame body and rolls. In the electronic blackboard that reads and outputs the information written on the writing surface, the central portion of the back board is magnetically attracted to the reinforcing member. Therefore, since the central portion of the rear board is magnetically attracted to the reinforcing member, the rear board mounted on the frame body does not warp even when affected by temperature, humidity, direct sunlight, and the like.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional plan view showing an internal structure of an electronic blackboard and a mounting structure of a back board. FIG. 2 is a perspective view of a part of the frame body and the rear board, showing a process of mounting the rear board on the frame body.
FIG. 3 is a perspective view showing a process of removing the rear board from the frame.

The electronic blackboard according to the present embodiment has the same basic structure as the electronic blackboard illustrated in FIGS. 4 to 7. Therefore, the same parts as those described with reference to FIGS. 4 to 7 are represented by the same reference numerals, and the description thereof will be omitted.

The back board 17 is made of polypropylene. A permanent magnet 31 is fixed to the center of the back surface of the rear board 17, that is, the front side of the electronic blackboard when viewed from the front. The permanent magnet 31 is made of a magnet sheet having a magnetic force of about 400 to 600 Gauss, and is attached to the back surface of the back board 17. In addition, the permanent magnet 31 has an elongated rectangular shape, and is arranged in an elongated shape in the vertical direction along the central reinforcing member 3 provided in the frame body 2. Further, the thickness of the permanent magnet 31 is such that the permanent magnet 31 is magnetically attracted to the reinforcing member 3 located in the central portion, and the rear board 1 is slidably mounted on the rear board guide 18.
The thickness is set so as not to cause the warp of 7.

In such a structure, the rear board 17
Is lightweight, has low rigidity, and is easily warped under the influence of temperature, humidity, direct sunlight, etc. On the other hand, in the state where the rear board 17 is slidably mounted on the rear board guide 18 and mounted on the frame body 2, the permanent magnet 31 is magnetically attracted to the reinforcing member 3, so that the rear board 17 is fixed in position. The back board 17 is kept in a state where it does not warp. Therefore, invasion of dust, ambient light, and the like into the inside of the device due to the warp of the rear board 17 is reliably prevented, and the internal structure of the reduction optical system 9 and the like is maintained in a good state.

Here, in order to mount the rear board 17 on the frame body 2, as shown in FIG.
Is pre-curved to keep the permanent magnet 31 from being magnetically attracted to the auxiliary member 3. This allows the back board 1
7 slide insertion becomes easy. Also, when the back board 17 is removed from the frame body 2, the back board 17 is pre-curved to separate the permanent magnet 31 from the auxiliary member 3 as illustrated in FIG. By sliding the back board 17 in this state, the back board 17 can be easily and smoothly removed from the frame body 2. When the rear board 17 is attached and detached as described above, since the permanent magnets 31 are long in the vertical direction, the movement distance of the permanent magnets 31 with respect to the auxiliary member 3 is short, and the attachment and detachment work of the rear board 17 is easy from this aspect as well. become. Moreover, since the permanent magnet 31 has a magnetic force of 400 to 600 gauss, it is easy to separate from the auxiliary member 3 by manual work while exerting a sufficient attraction force to the auxiliary member 3. Therefore, the attachment / detachment work of the rear board 17 can be further facilitated from this aspect.

In the implementation, the rear board guides 18A, B, C and D may have any structure as long as they can support the rear board 17 in a slidable manner. It is not necessary. For example, only the rear board guides 18C and 18D may be provided, or only the rear board guides 18A, B and D may be provided. However,
In these cases, a structure is required to prevent light and dust from entering the inside of the electronic blackboard from a portion where the back board guide 18 is not provided.

[0023]

According to the electronic blackboard of the invention described in claim 1, since the reinforcing member provided on the frame body and the warp preventing member for magnetically attracting the central portion of the rear board are provided, the temperature, humidity,
It is possible to prevent the rear board mounted on the frame from warping even if it is affected by direct sunlight, and therefore dust and disturbance light inside the device due to the warp of the rear board. It is possible to reliably prevent invasion of the like.

According to the second aspect of the present invention, since the warp prevention member is formed by a permanent magnet of 400 to 600 gauss fixed to the rear board at a position facing the reinforcing member of the frame body,
The warp prevention member can be easily configured, and while the warp of the rear board can be prevented, a magnetic attraction force that does not hinder the operation of attaching and detaching the rear board can be obtained. The work can be facilitated.

According to the third aspect of the present invention, the reinforcing member has a structure in which the upper and lower two sides of the frame are connected, and the warp preventing member is formed in a vertically elongated shape along the reinforcing member. Due to the elongated shape in the vertical direction, it is possible to easily obtain a magnetic attraction force that can prevent the warp of the rear board, and also to avoid the difficulty in the attaching / detaching operation of the rear board that is attached / detached in the left / right direction. be able to.

According to the fourth aspect of the invention, since the central portion of the back board is magnetically attracted to the reinforcing member provided on the frame body, even if it is affected by temperature, humidity, direct sunlight, etc. It is possible to prevent the rear board mounted on the frame body from warping, and thus it is possible to reliably prevent the entry of dust, ambient light, or the like into the device due to the warp of the rear board. it can.

[Brief description of drawings]

FIG. 1 is an overall cross-sectional plan view showing an internal structure of an electronic blackboard and a mounting structure of a back board as an embodiment of the present invention.

FIG. 2 is a perspective view of a part of the frame body and the rear board, showing a process of mounting the rear board on the frame body.

FIG. 3 is a perspective view showing a process of removing the rear board from the frame.

FIG. 4 is a perspective view showing an external configuration of an electronic blackboard as a conventional example.

FIG. 5 is an overall cross-sectional plan view showing the internal structure and the mounting structure of the back board.

FIG. 6 is a rear view of the electronic blackboard with the stand omitted.

FIG. 7 is a perspective view showing details of a mounting structure of a rear board.

[Explanation of symbols]

2 Frame 3 Reinforcing Member 5 Writing Sheet 6a Front Side Opening 6b Rear Side Opening 7 Writing Side 17 Back Board 18A, 18B, 18C, 18D Back Board Guide 19 Guide Rail 31 Warp Prevention Member (Permanent Magnet)

Claims (4)

(57) [Claims] 1. A frame body made of sheet metal having a rectangular frame shape surrounding a periphery of a writing sheet and other built-in elements rotatably supported, and a frame body made of sheet metal having a reinforcing member in a central portion, A rear board guide attached to the frame body having a guide rail arranged along the frame body at a position projecting outward from the rear surface, and slidably supported by the guide rail of the rear board guide. An electronic blackboard comprising: a back board that covers a back surface of a frame; and a warp prevention member that magnetically attracts the central portion of the back board and the reinforcing member. 2. The electronic blackboard according to claim 1, wherein the warp prevention member is formed by a permanent magnet of 400 to 600 Gauss fixed to the rear board at a position facing the reinforcing member of the frame body. . 3. The reinforcing member has a structure that connects the upper and lower two sides of the frame body, and the warp prevention member is formed in a vertically elongated shape along the reinforcing member. Or the electronic blackboard described in 2. 4. A writing machine having a frame body made of sheet metal having openings at front and rear surfaces and having a central portion reinforced by a reinforcing member, which is rotatably held by the opening on the front side of the frame body. The sheet is exposed as a writing surface, and the flat back board slidably and detachably attached to the rear surface of the frame covers the opening on the back side of the frame, and the rolling writing sheet is covered. An electronic blackboard that reads and outputs information written on a writing surface, wherein the central portion of the back board is magnetically attracted to the reinforcing member.