JPS63115223A - Electronic blackboard - Google Patents

Abstract

PURPOSE:To edit and print out a desired part of characters, symbols, etc., entered on the surface of a sheet by inputting and storing the position signal of a tablet on the rear face of the sheet in a memory and designating a sheet area with a pen. CONSTITUTION:Plural electrode wires 2 and 4 in the X-axis direction and the Y-axis direction are arranged in an electronic blackboard 1, and a penpoint 15 and a detector 16 are buried in a pen 10; and when the penpoint 15 is brought into contact with the sheet, scanning pulses impressed to electrode wires 2 and 4 are detected, and detected pulses are converted to a digital signal, and a ROM26 for correction is referred by a proportional calculation circuit 25 to determine position information, and this information is stored in a buffer memory 29 through an adding circuit 27. When entered characters, etc., are outputted by a printer 47, a switch 30 is connected to a contact 1 in case of output of the whole of them but is connected to a contact 2 in case of output of a part of them, and the pen 10 is brought into contact with a desired part on the sheet. A printer strobe signal is impressed to the printer 47 from an OR gate 44 by the output of an AND gate 42, and data in a memory 29 corresponding to said part is outputted.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a so-called electronic blackboard that electronically processes characters, symbols, etc. written on a sheet surface and outputs it to copy paper, etc. This relates to an electronic blackboard that allows editing such as trimming and deletion of characters, symbols, etc. written on the surface of the sheet. Generally used is a device in which characters, symbols, etc. are read with a COD camera and output on copy paper.

(Problems to be Solved by the Invention) In the above-mentioned conventional electronic whiteboard, it is not possible to perform trimming to output only a designated area of the sheet or deletion without outputting it.

Further, in the conventional electronic blackboard, it is necessary to move the sheet and scan the image with a COD camera, which has the disadvantage that reading 9 takes time.

(Means for Solving the Problems) The present invention has been made in view of the above conventional problems, and its gist is to provide a tablet having a plurality of electrodes arranged along the coordinate axes therein, and At the same time, characters, symbols, etc. are written on the arranged synthetic resin sheet and the surface of the sheet.

a pen that detects signals from a plurality of electrodes in the tablet; and an electronic blackboard that outputs signals corresponding to characters, symbols, etc. written on the surface of the sheet using the signals detected by the pen, This is an electronic blackboard that edits and outputs characters, symbols, etc. written in a designated area on the surface of the sheet.

(Function) The pen of the present invention can visually write characters, symbols, etc. on the surface of the sheet, and also detects and inputs position signals from the tablet placed on the back of the sheet, corresponding to each position on the surface of the sheet. This allows image information to be stored and edited, such as by outputting or deleting the stored image information in a region of the sheet specified with a pen.

゛(Example) An example of the present invention will be described with reference to the accompanying drawings. Second
Inside the electronic blackboard 1, whose main parts are cut away in the figure, there are a plurality of electrode wires 2 arranged in the X-axis direction, and on top of the plurality of electrode wires 2 in the X-axis direction, a dielectric layer 3 is disposed. A plurality of electrode wires 4 in the Y-axis direction are disposed therebetween. The plurality of electrode wires in the Y-axis direction are covered with a dielectric layer 5 to form a tablet 6, and characters, symbols, etc. are written on the surface of the tablet 6 with a pen 10 as a writing instrument.

Erasable synthetic resin sheets 7 are arranged in close contact with each other. Further, legs 8, 8 are erected at both lower ends of the tablet 6, so that the tablet 6 can stand on its own. Next, the various operations will be explained with reference to FIG. 1, which is an overall electrical block diagram. First, the switch 30 is connected to the terminal 1 in FIG. 1, and the inverter 67 is set to HIGH. Reference clock generator 11
A clock pulse is applied to a counter 12, and a pulse is applied from the counter 12 to an X-axis decoder 13 and a Y-axis decoder 14 of the electronic blackboard 1. Here, the X-axis decoder 13. Y-axis decoder 14 and X thin electrode wire 2. To explain the relationship with the Y-axis electrode line 4, the X-axis decoder 13 and the X-thin electrode line 2 are selectively connected, and scanning pulses are sequentially applied to the X-thin electrode line 2. After the scanning is completed, scanning pulses are sequentially applied from the Y-axis decoder 14 to the Y-axis electrode lines 4. The pen 10 has a metal detector 16 embedded in the pen tip 15 as a cursive writing body, the pen tip 15 can be moved back and forth, and the rear end of the pen tip 15 has a suppression switch that opens and closes depending on the writing pressure of the pen tip 15. Further, behind the suppression switch 17, an impedance conversion circuit 18 is built in. Pen 10 nib 1
Since the pen tip 5 is impregnated with ink, when the pen tip 15 is brought into contact with the sheet 7 of the electronic blackboard 1, the ink impregnated in the pen tip 15 is transferred to the sheet 7 and writing starts.

When the pen tip 15 comes into contact with the sheet 7, the suppression switch 17 is turned on and the X thin electrode wire 2 or Y
The scanning pulse applied to the axial electrode line 4 is capacitively coupled to the detector 16 and applied to the impedance conversion circuit 18 and then to the amplifier 19 . This detected pulse is transmitted to amplifier 1
9 and applied to the waveform shaper 20 and analog-to-digital conversion circuit 21. The analog-to-digital conversion circuit 21 receives a start signal from the AND gate 22 of the pulses from the wave clock pulse generator 11, and converts the analog to
Start digital conversion and send BUSY signal to strobe circuit 2
3. The signal converted into a digital signal by the analog-to-digital conversion circuit 21 is applied to the buffer 24 in synchronization with the strobe signal, and the position information is determined from the buffer 24 by referring to the correction ROM table 26 in the proportional calculation circuit 25 and added. applied to circuit 27.

Here, the detection situation of the contact position signal of the tablet 6 of Ben 10 will be explained. Each of the Y thin electrode wires 4 has a predetermined pitch (52 in this embodiment).
They are arranged at equal intervals (in pitch). Also, X thin electrode wire 2. One end of the Y thin electrode wire 4 is connected to an X-axis decoder 13 and a Y-axis decoder 14, respectively, and the other end is open. If the input resolution of the electronic blackboard 1 is 1 gate, the interval between the electrode wires is 32 degrees, so the detection signal from the two electrode wires closest to the position where Ben 10 is in contact with the tablet B is detected. Determine the corresponding position coordinates. This is done by measuring the detected voltage from the two electrode wires with the proportional calculation circuit 25,
The coordinate position signal is determined by regarding the measured value of the detected voltage as being proportional to the distance between the pen 10 and the two electrode wires that are close to each other. In this case, the analog-digital conversion circuit 21 is 5b
If you use something larger than it, the spacing between electrode lines arranged at 32-square intervals can be expressed by 1/32 or more, which means that the input resolution is 1. m can be achieved. The count value (6bit) of the counter 12 indicating the coordinate position of the signal line is added to the signal (sbit) 11 accumulated in this way by the addition circuit 27.
t) is added to the higher order and stored in the buffer memory 29 via the AND gate 28. The above operation is performed using the X thin electrode wire 2.
After determining the position signal in the X-axis direction, the Y-axis direction is sequentially determined, and this is repeated while the pen tip 15 of the pen 10 is in contact with the sheet 7. Also.

What is the correspondence between tablet 6 and buffer 1 memory 29?

Assuming the size of tablet 6 to be 100αX75cIn 6
This was achieved using 12 4Kbit memories.

This situation will be explained with reference to Figure 3'21. This means that you will be able to respond to each item. In this way, a signal is inputted and stored in the buffer memory 29 corresponding to the address corresponding to the entry on the sheet 7 of the electronic blackboard 1 at one pitch.

Next, the sheet 7 of the electronic blackboard 1 accumulated in the above-mentioned procedure
A case will be explained in which characters, symbols, etc. written in a file are output to a printer. First, if you want to output all the characters, symbols, etc. written on the sheet 7 of the electronic blackboard 1 using the printer 47, connect the switch 30 to the terminal side of 1 (the state shown in Fig. 1) and connect the clock generator. A print start signal is applied to the counter 31, and a clock pulse is applied from the clock generator 61 to the counter 32. The counter 32 is an UP counter, and is set to 0 by the clock pulse from the clock generator 61.
The data is applied to the address terminal of the buffer 1 memory 29 while counting sequentially from
prints the results on paper according to the data. This printer 47 is being printed.

The printer 47 applies a BUSY signal to the clock generator 51 to synchronize the printer operation.

Characters and notes written on sheet 7 of electronic blackboard 1.

In the case of so-called trimming in which only desired parts such as numbers are outputted by the printer 47, terminal 2 of the switch 30 is connected, the inverter 38 is set to HIGH level, and the diagonal 2 of FIG.
Points (Xm, Yp) and (Xn, Yq) are sequentially brought into contact with the pen tip 15 of the Ben 10 on the sheet 7 of the electronic whiteboard 1, and the respective coordinate position signals are transferred to the trimming register (1) 55 and the trimming register (2). 34 via an AND gate 45. I of AND gate 45 (7 limp flop 40 is set at IGH level.

The Q output of this flip-flop 40 is the AND gate 41
is applied to one input terminal of As in the case of the overall output, when a print start signal is applied to the clock generator 51, one of the clock pulses of the clock generator 31 is applied to the other input terminal of the AND gate 41, and is applied to this amplifier 47. . The clock pulses of the clock generator 51 are also applied to the input terminal of the AND gate 42. The other clock pulse of the clock generator 31 is applied to the counter 32, and the trimming register (2) 34 is applied to the count terminal from 0 of the counter 32.
The coordinate values of are applied to the C terminal of the comparator circuit (2) 56. Comparison circuit (1) 35 operates AND gate 4 when the count value of counter 32 and the coordinate position are less than or equal to q in the Y-axis direction.
2, a printer strobe signal is applied from the 9OR gate 44 to the printer 47, and the data in the backup memory 29 corresponding to this area is output from the printer 47.

Furthermore, in the case of so-called deletion, in which desired areas such as characters and symbols written on the sheet 7 of the electronic blackboard 1 are not output, terminal 3 of the switch 30 is connected.

This can be achieved by inputting the coordinate positions of two diagonal points of the desired area using a circuit surrounded by a dashed line, which has a logical configuration completely opposite to that of the trimming case, and controlling the printer strobe signal.

(Effects of the Invention) Since the present invention is configured as described above, desired portions of characters, symbols, etc. written on the electronic blackboard can be easily printed out in a short time.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an electrical block diagram, FIG. 2 is an external perspective view with main parts cut away, and FIG. 3 is a memory layout diagram. DESCRIPTION OF SYMBOLS 1... Electronic blackboard, 2... X-axis electrode line, 4... Y-axis electrode line, 6... Tablet, 7... Sheet, 10...
...Pen, 11...Reference clock generator, 12...
force, counter, 13...X-axis decoder, 14...Y-axis decoder, 16...metal detector, 29...buffer memory, 30...switch, 53.54...trimming register, 35 .56... Comparison circuit.

Claims (1)

[Claims] A tablet having a plurality of electrodes arranged along the coordinate axes, a synthetic resin sheet placed on the surface of the tablet, characters, symbols, etc. written on the surface of the sheet, and a plurality of electrodes inside the tablet. The electronic blackboard includes a pen that detects a signal from an electrode, and an electronic blackboard that outputs a signal corresponding to characters, symbols, etc. written on the surface of the sheet using the signal detected by the pen, An electronic blackboard characterized by editing and outputting characters, symbols, etc. written in a designated area.