JPH0569694A - Electron-controlled blackboard - Google Patents

Abstract

PURPOSE:To enable a drawn-image to be duplicated, stored, restored and retrieved and both image drawing and printing to be performed simultaneously and at the same time, eliminate the depletion of a felt pen by providing a pixel magnet which is a permanent magnet on the rear of a screen, and drawing/ deleting a character and a figure using a pixel fixing magnet and a pen for controlling the pixel magnet. CONSTITUTION:Pixel magnets 15 to 18 in a pixel part 4 are loosely bound under the attractive force of pixel-fixing magnets 11 to 14 in a steady state and therefore, nothing is viewed on a screen 1. If an electromagnetic pen 2 with a tip magnetized to an N pole is allowed to approach the screen 1, the pixel magnets 15 to 18 become attracted to the screen 1 by the magnetic force of the electromagnetic pen 2, resulting in the appearance of a pixel on the screen 1. Under this state, the pixel magnets 15 to 18 are fixed on the rear surface of the screen 1 without being influenced by the magnetic force of the pixel-fixing magnets 11 to 14. To restore the pixel magnets 15 to 18 to a steady state, these magnets 15 to 18 are forced back to the pixel-fixing magnets 11 to 14 by the magnetic force of the tip 19, using the electromagnetic pen 2 with a tip magnetized to an S pole.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an electronically controlled blackboard.

[0002]

2. Description of the Related Art A conventional electronically controlled blackboard has a copying function of copying what is drawn with a water-based marker on a plate surface (hereinafter referred to as a screen) while rotating the screen.

[0003]

Since the conventional electronically controlled blackboard has only a copying function for copying the characters and figures drawn by water-based magic on the screen while rotating the screen, when copying. Has a problem that the screen cannot be used and there is no way to save it other than copying.

Further, there are drawbacks that the running cost of the water-based magic is high and that dusts are accumulated when the screen is erased and cleaning is difficult.

[0005]

An electronically controlled blackboard according to the present invention is provided with a plurality of drawing pixel portions arranged in a matrix on the back surface of a screen, and drawing and drawing characters and figures on the screen. A pen for deleting is provided, and the pixel portion has a pixel fixing magnet fixed inside and a tip of the pen is in close contact with the pixel fixing magnet when the tip of the pen is in a deleted state, and the tip of the pen is in a drawing state of the screen. And a pixel magnet that is a permanent magnet that moves away from the pixel fixed magnet to the back surface of the screen when brought close to the front surface, and the pixel unit is operated by the pen to approach the pixel magnet to the screen and It has an electromotive force generation part that generates two different types of induced electromotive force depending on the distance from the screen, and further detects the two types of dielectric electromotive force from the electromotive force generation part. Storing means for converting into a digital signal and storing it in the storage part, display means for displaying the information stored in the storage part on the display part, and printing means for printing the information stored in the storage part on the printing part. have.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a view showing the basic principle of the present invention, FIG. 2 is an enlarged view of one pixel when the pixel fixed magnet in FIG. 1 is a permanent magnet, and FIG. 3 is a pixel fixed magnet in FIG. FIG. 3 is an enlarged view of one pixel when the is an electromagnet.

Referring to FIG. 1, the basic principle of the present invention is that a screen 1, an electromagnetic pen 2 that draws electromagnetically on the screen 1, and a matrix 19 controlled by a tip 19 of the electromagnetic pen 2 on the back side of the screen 1. A plurality of pixel units 4 are provided, and each pixel unit 4 is insulated by an insulating sheet 3. Each pixel unit 4 is provided on the back surface of the screen 1 with the pixel magnet 1.
5 to 18 and pixel fixed magnets 11 to 14 at positions slightly apart from the back surface of the screen 1.

Next, the principle of the present invention will be described with reference to FIGS.
Will be explained together.

In the steady state, the pixel magnets 15 to 18 are loosely bound to the pixel fixed magnets 11 to 14 (relationship between the pixel fixed magnet 13 and the pixel magnet 17), and the screen 1
Nothing is visible above. On such a screen 1,
The electromagnetic pen 2 whose tip 19 is magnetized to the N pole is displayed on the screen 1.
2, the pixel magnet 22 is attracted to the screen 1 by the magnetic force of the electromagnetic pen 2, and the pixel appears on the screen 1 as shown in FIG.

In this state, the pixel magnet is fixed on the back surface of the screen 1 without being affected by the magnetic force of the pixel fixing permanent magnet 21. In order to return the pixel magnet to the steady state, the electromagnetic pen 2 having the tip 19 magnetized to the S pole is used and the repulsive force of the magnetic force of the tip 19 is used to push the pixel magnet 22 back to the pixel fixed permanent magnet 21, for example. be able to.

FIG. 3 shows a case in which the pixel fixed magnets 11 to 14 of FIG. 1 are changed to electromagnets. In a steady state, a current is passed to the pixel magnet 32 side of the pixel fixed electromagnet 31 so that it becomes an S pole. On the contrary, by supplying a large current so as to have the N pole, all the pixel magnets on the screen 1 can be instantly brought to a steady state (erased state).

FIG. 4 is a block diagram showing an embodiment of the present invention.

Referring to FIG. 4, in the present embodiment, a screen display section 49 having a screen for electromagnetically drawing characters and figures as shown in FIG. 3, and an electromagnetic change of pixels on the screen of the screen display section 49. Electromotive force detection unit 4 for detecting
7, a memory control unit 46 that converts the detection signal of the electromotive force detection unit 47 into a digital signal and writes the digital signal in the memory 48, a print control unit 42 that causes the printing device 43 to print the information written in the memory 48, The information written in the memory 48 is displayed on the display unit 45.
And a central control unit 41 for controlling the entire embodiment.

In the present embodiment, the pixel portion on the back surface side of the screen of the screen display portion 49 has the structure shown in FIG.

Next, the operation of this embodiment will be described with reference to FIGS. 3 and 4 in the screen display section 49. When the pixel magnet 32 moves from the steady state as shown in FIG. The induced electromotive force V ₁ is generated by electromagnetic induction. This voltage V ₁ is detected by the electromotive force detection unit 47,
The signal A is sent to the memory control unit 46.

When the memory controller 46 receives the signal A, the memory controller 46 writes "1" in the memory 48 so as to correspond to each appearance of a pixel. On the contrary, when the pixel is erased by the electromagnetic pen 2, the voltage V ₁ is applied to the pixel fixed magnet 31.
Inverse electromotive force -V ₁ is generated at. This voltage −V ₁
Is detected again by the electromotive force detector 47, and a signal -A is sent to the memory controller 46. When the memory control unit 46 receives the -A signal, it writes "0" in the memory 48 to cope with the deletion of pixels.

In this way, the state of each pixel is stored in the memory 4
8 and can be stored in any number of screens by increasing the capacity of the memory 48.

When ending the screen 1 and proceeding to the screen 2, the address of the memory 48 is automatically updated by the central control unit 41, and the contents of the screen 1 are stored in the memory 48. Under the control of the central control unit 41, the screen once stored in the memory 48 is displayed on the display unit 45 for retrieval, or the printing device 43 is used.
It can be printed on.

When the screen is re-edited, a voltage V ₁ or −V ₁ is generated in the pixel fixed electromagnet 31 by the control of the central control unit 41, the memory control unit 46, and the memory 48.
The image stored on the screen 1 can be restored.

As can be seen from FIG. 4, since the screen display unit 49, the memory 48, the display unit 45 and the printing device 43 are controlled by the central control unit 46 so that they can operate independently of each other, Simultaneous operations such as screen search while drawing or screen printing are also possible.

[0022]

As described above, according to the present invention, a pixel magnet, which is a permanent magnet, is formed on the back surface of a screen by using a permanent magnet or a pixel fixed magnet composed of an electromagnet and a pen for controlling the pixel magnet. Since the electronically controlled blackboard that does not require the magic can be provided by having the configuration to be deleted, there is an effect that the running cost of the magic can be eliminated cleanly.

Further, an electromotive force detection section for detecting movement of the pixel magnet, a memory, a display section and a printing section, a memory control section, a display control section and a print control section for controlling them, and a central control for controlling the whole. By providing a copy section,
This has the effect of restoring a screen that has been erased once, searching for a screen, and simultaneously performing drawing and printing.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic principle of the present invention.

FIG. 2 is an enlarged view of one pixel when the pixel fixed magnet in FIG. 1 is a permanent magnet.

FIG. 3 is an enlarged view of one pixel when the pixel fixed magnet in FIG. 1 is an electromagnet.

FIG. 4 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 Screen 2 Electromagnetic Pen 3 Insulating Sheet 4 Pixel Section 11-14 Pixel Fixed Magnet 15-18, 22, 32 Pixel Magnet 19 Tip 21 Pixel Fixed Permanent Magnet 31 Pixel Fixed Electromagnet 41 Central Control Section 42 Printing Control Section 43 Printing Device 44 Display Control unit 45 Display unit 46 Memory control unit 47 Electromotive force detection unit 48 Memory 49 Screen display unit

Claims (3)

[Claims] 1. A back surface of a screen is provided with a plurality of pixel portions for drawing arranged in a matrix form, and a pen for drawing and deleting characters and figures is provided on the screen, and the pixel portion is internally formed. A pixel fixed magnet fixed to
A pixel of a permanent magnet that comes into close contact with the pixel fixing magnet when the tip of the pen is in a deleted state and moves to the back surface of the screen away from the pixel fixing magnet when the tip of the pen approaches the surface of the screen in a drawing state. An electronically controlled blackboard having a magnet. 2. The pixel unit has an electromotive force generating unit that generates two different types of induced electromotive force depending on whether the pixel magnet approaches the screen or separates from the screen by operating the pen. The electronically controlled blackboard according to claim 1. 3. Storage means for detecting the two types of dielectric electromotive forces from the electromotive force generating section, converting them into digital signals and storing them in a storage section, and displaying information stored in the storage section on a display section. The electronically controlled blackboard according to claim 1, further comprising: a display unit for displaying the information stored in the storage unit, and a printing unit for printing the information stored in the storage unit in the printing unit.