JPS6180327A - Electronic blackboard device - Google Patents

Abstract

PURPOSE:To erase easily only a required part by writing characters or the like on an electronic blackboard with a choke including a color oscillator and erasing the written colored characters or the like with a blackboard eraser including an oscillator. CONSTITUTION:Sense wires are embedded like a matrix on the electronic blackboard in the X and Y directions and connected to a multiplexer 2 respectively. When red characters or the like are written on the blackboard 1 with a red R chole 3-1 e.g., a signal having frequency f1 outputted from the oscillator included in the choke is detected by said sense wires and respectively scanned by the multiplexer 2 to detect the positional information of the characters or the like. The information of the characters or the like is stored in a picture memory 13. When the characters or the like on the electronic blackboard 1 are erased with the blackboard eraser 4, the frequency f0 of its built-in oscillator is detected by the sense wires and the characters or the like are erased from said memory 13. The sort of the color of the choke 3 can be discriminated by discriminating the frequency of the signal detected by the sense wires.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to electronic blackboard devices, especially when characters are written on an electronic blackboard in which sense lines are embedded using chalk (writing instrument) with a built-in oscillator. Information such as the characters is read and stored in the image memory, and when the characters, etc. written on the electronic blackboard are erased using a blackboard eraser with a built-in oscillator, the characters, etc. stored in the image memory are erased. The present invention relates to an electronic whiteboard device configured to be able to perform the following functions.

[Problems to be solved by conventional technology and invention] Conventionally,
When converting characters, etc. written on a blackboard 1- into the form of an image signal, write the characters, etc. on a sheet-like blackboard and gradually move the blackboard by winding it up while using a reading sensor to convert the characters, etc. It was read sequentially and converted into an image signal.

For this reason, it was generally possible to read the blackboard only after all characters had been written on it. Moreover, since a light source, a reading sensor, a moving mechanism, etc. are required for the reading, there is a problem that the mechanism becomes complicated. There is also a so-called digitizer for inputting the coordinates of a point on the plane -A into a computer system. The digitizer is generally used mainly for inputting the coordinates of points on a plane, and although it is possible to input the written characters etc. in the form of position coordinates, , green (G), blue (B), etc., and furthermore, it is difficult to easily erase only desired portions using a blackboard eraser.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention writes characters, etc. on an electronic blackboard in which sense lines etc. are embedded using a chalk equipped with a built-in oscillator that oscillates a frequency corresponding to the color, and the written characters, etc. The position information and color information of the electronic blackboard are detected in the form of electric signals and stored in the image memory, and the image is erased using a blackboard eraser with a built-in oscillator to erase colored characters written on the electronic blackboard. By erasing the corresponding information stored in the memory, colored characters, etc. can be stored in the image memory, etc. in the form of image signals using a simple configuration, and the characters, etc. stored in the image memory can be erased using a blackboard eraser. It is being erased. Therefore, the electronic blackboard device of the present invention is an electronic blackboard device that converts characters written on the electronic blackboard into an image signal, and includes a plurality of sensors embedded in the electronic blackboard in the vertical and horizontal directions, and a frequency discriminator for discriminating a predetermined frequency signal from signals detected by the sensor; a scanning device for scanning the signals detected by each of the sensors; and a frequency discriminator for discriminating a predetermined frequency signal from among the signals detected by the sensor; a coordinate detection section for determining from which position of the buried sensor a signal is detected; When characters, etc. are written on the electronic blackboard using a writing instrument that is equipped with an image memory that stores image signals corresponding to the written characters, etc., and has a built-in oscillator that generates frequency signals corresponding to the types of colors. An image signal corresponding to the character, etc. is stored in the image memory, and when the character, etc. written on the electronic blackboard is erased using a blackboard eraser that has a built-in oscillator that generates a predetermined frequency signal, the eraser The present invention is characterized in that the image signal corresponding to the written character is deleted from the image memory.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a configuration diagram of one embodiment of the present invention, and FIG. 2 is an operation explanatory diagram for explaining the operation of the configuration of one embodiment of the present invention shown in FIG. 1.

In the figure, l is an electronic blackboard, 2-1, 2-2 is a multiplexer, 3-1 to 3-3 are chalks, 4 is a blackboard eraser, and 5
-1.5-2 is a band pass filter, 6-1.6-
2 is an amplifier, 7-1.7-2 is a pulse shaping section, 8-1.
8-2 is a level detector, 9 is a frequency discriminator, ■0 is xy
11 is a color information detection section, 12 is a video circuit, 13 is an image memory, and 14 is a display.

In FIG. 1, sense lines are embedded in a matrix 1,77 in the electronic blackboard 1 in the horizontal direction (X direction) and the vertical direction (Y direction) as indicated by dotted lines.

Each sense line is connected to multiplexers 2-1 and 2-2, respectively, as shown. Therefore,
As described later, for example, a red color (R) is displayed on the electronic blackboard 1.
When writing red letters etc. using the chalk 3-1, the frequency f emitted from the oscillator built in the chalk 3-1
1 signal (frequency signal corresponding to red color) is detected by the sense line, and by scanning the sense line using multiplexers 2-1 and 2-2, the position information of characters etc. is transferred to the sense line. It is detected in the form of the coordinates of the intersection of . In this way, characters, etc. are written on the electronic blackboard I using the red (R), green (G), or blue (B) chalk 3-1 to 3-3. The position coordinates are respectively detected and stored in the image memory 13 in the figure.Furthermore, when characters written on the electronic blackboard 1 are erased using the blackboard eraser 4 in the figure, the blackboard eraser 4 has built-in The frequency f emitted from the oscillator.

The signal (frequency signal corresponding to blackboard erasing) and position are detected by the sense line, and characters, etc. existing in the corresponding area from the image memory 13 are erased. The configuration and operation will be explained in detail below.

In the figure, multiplexers 2-1 and 2-2 are used to scan sense lines indicated by dotted lines arranged in the electronic blackboard 1 in the X direction and the Y direction, respectively. Therefore, as described above, the loci of characters written on the electronic blackboard 1 are sequentially detected in the form of the coordinates of the intersections of the sense lines by the scanning.

Color information can be determined based on the frequency detected from the sense line.

In the figure, a band pass filter 5-1.5-2 removes noise etc. from the signal obtained by scanning the sense line by the multiplexers 2 to 1.2-2 and selects a desired frequency range, etc. This is for selectively extracting only the respective signals.

In the figure, amplifiers 6-1, 6-2 are for amplifying the signals after noise and the like have been removed by the band pass filters 5-1, 5-2.

In the figure, the pulse shaping section 7-1.7-2 is connected to the amplifier 6-1.
This is for shaping the waveforms of the signals respectively amplified by 6-2.

In the figure, the level detection section 8-1, 8-2 is the pulse shaping section 7.
-1.7-2, the signals after waveform shaping are 2
This is for converting into a value signal (a signal consisting of "1" or "0").

In this conversion, for example, the darkness value is set at a predetermined level, and l'' is given to a signal with an amplitude larger than the darkness value level, and ``l'' is given to a signal with an amplitude smaller than the darkness value level.
This is done by giving 0''.

In the figure, the frequency discriminator 9 is the pulse shaping section 7-1.7-2.
This is for discriminating the frequencies contained in the signal supplied from the source. For example, the choke 3-1.3-2.3
-3 or blackboard eraser 4 is used to detect the frequencies f, , f2, f, or fo, respectively.

In the figure, the xy coordinate detection section IO is the level detection section 8-1.8.
This is for calculating the XY coordinates based on the respective signals notified from -2. The calculation of the XY coordinates is performed using the matrix when writing characters, etc. on the electronic blackboard 1''2 using the chalks 3-1 to 3-3, or when erasing the written characters, etc. using the blackboard eraser 4.・By scanning the sense lines arranged in a 2-wire pattern using the multiplexer 2-1, 2-2, the signal (signal with frequency f0 to f3) is obtained in the form of the XY coordinates of the intersection of the detected sense lines. It will be done.

In the figure, the color information detection unit 11 calculates the color information written based on the frequencies discriminated by the frequency discriminator 9. This is performed by referring to a predetermined table corresponding to the frequencies discriminated by the frequency discriminator 9. For example, frequencies f, , f, and f are searched as red (R), green (G), and blue (B), respectively. Further, the frequency f0 will be searched as meaning "cleaning the blackboard."

In the figure, a video circuit 12 stores information such as colored characters in an image memory 13 based on the XY coordinate information notified from the XY coordinate detection section 10 and the color information notified from the color information detection section 11. It is something. The stored information such as characters corresponds to colored characters written on the electronic blackboard 1.

A display 14 in the figure is for displaying information such as colored characters stored in the image memory 13.

By adopting the above configuration, characters written on the electronic blackboard 1 using the colored chalks 3-1 to 3-3 are stored in the image memory 13 in real time, and are also displayed on the display 14. It will be displayed. Further, if necessary, by erasing the colored characters written on the electronic blackboard "-" using the blackboard eraser 4, the characters stored in the image memory 13 can be erased.

Figure 2 explains the operation in which when characters, etc. are written on the electronic blackboard 1 using a chalk 3-1 etc., a frequency signal emitted from an oscillator built in the chalk 3-1 etc. is detected. An operation explanatory diagram is shown.

The detected waveform shown in FIG. Show what you have. The detected waveforms correspond to signals of various frequencies oscillated by oscillators built in the chalks 3-1 to 3-3, the blackboard eraser 4, and the like.

FIG. 2(B) to FIG. 2(E) Illustrated discrimination frequency f. . . . f3 respectively indicate the frequencies discriminated from the detected waveforms shown in FIG. . The frequency discrimination is performed by providing a tuning circuit tuned to each frequency or a frequency filter with good selection characteristics.

By distinguishing the frequency of the signal detected by the sense line as described in 1- above, it is possible to determine the type of color of the chalk, and it is also possible to determine whether it is a blackboard eraser or the like. Further, as described above, the position at which a character or the like is written can be detected depending on the position at which a signal is detected in the X and Y directions of the sense lines provided in a seven-point shape.

〔Effect of the invention〕

As explained above, according to the present invention, letters, etc. are written on an electronic blackboard in which sense lines etc. are embedded using chalk that has a built-in oscillator that oscillates a frequency corresponding to a color, and the positional information of the letters, etc. Color information is detected in the form of electrical signals and stored in an image memory, and colored characters written on the electronic blackboard are erased using a blackboard eraser that includes an oscillator to create the image. Since the corresponding information stored in the memory is erased, colored characters, etc. can be stored in the image memory in the form of image information with a simple configuration, and can also be stored in the image memory using a blackboard eraser. You can erase the characters, etc.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of one embodiment of the present invention, and FIG. 2 is an operation explanatory diagram for explaining the operation of the configuration of one embodiment of the present invention shown in FIG. 1. In the figure, 1 is an electronic blackboard, 2-1.2-2 is a multiplexer, 3-1 or 3-3 is chalk, 4 is a blackboard eraser, and 5
-1.5-2 is a hand pass filter, 6-1.6-
2 is an amplifier, 7-1.7-2 is a pulse shaping section, 8-1.
8-2 is a level detector, 9 is a frequency discriminator, and 10 is an XY
11 is a color information detection section, 12 is a video circuit, 13 is an image memory, and 14 is a display.

Claims (1)

[Claims] In an electronic blackboard device that converts characters written on an electronic blackboard into an image signal, a plurality of sensors are embedded in the electronic blackboard in the vertical and horizontal directions, and a predetermined signal is detected from among the signals detected by the sensors. a frequency discriminator for discriminating frequency signals; a scanning device for scanning the signals detected by each of the sensors; and a signal scanned by the scanning device, from which of the plurality of embedded sensors. a coordinate detection unit that determines whether a signal is detected; and an image signal corresponding to characters written on an electronic blackboard based on the frequency discriminated by the frequency discriminator and the position detected by the coordinate detection unit. and an image memory for storing a character, etc., when a character, etc. is written on the electronic blackboard using a writing instrument containing a built-in oscillator that generates a unique frequency signal corresponding to the type of color, an image signal corresponding to the character, etc. is stored in the image memory, and when characters, etc. written on the electronic blackboard are erased using a blackboard eraser having a built-in oscillator that generates a predetermined frequency signal, an image signal corresponding to the erased characters, etc. An electronic blackboard device characterized in that the image memory is erased from the image memory.