JPS5957380A - Character recognizing device - Google Patents

Abstract

PURPOSE:To simplify the structure of a writing utensil by detecting a character input by a pair of detectors arranged concentrically around a core. CONSTITUTION:A core 2 for ball-point pen is supported by a supporting member 3 in the body 1 of a writing utensil to allow free rocking. An electronic circuit is provided in the body 1, and the small diameter part 2a of the core 2 is led out to the outside of the body through a hole 4 by the operation of a knock button 5, and at the same time, a power source is turned on. Pressure sensitive rubbers 8a, 8b that change resistance according to pressure are provided in sliding contact with the small diameter part, and minute gaps 9a, 9b are provided between them. In the right oblique downward direction, the pressure only exerted on the rubber 8a is by writing action is designated as 1, in the left oblique upward direction, the pressure only applied to the rubber 8b is designated as 2. In upper right and lower left directions, the pressure applied to rubbers 8a, 8b are designated as 3, and the state that gives no pressure to both rubbers is designated as 0. Characters written by writing action are recognized by the electronic circuit, and displayed on a display section 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a character recognition device that recognizes character input by detecting the pressure applied to the core of a writing instrument and its direction in response to a writing operation.

This kind of character recognition device has two parts around the core of the tortoise marking tool.
A system has been proposed in which two detection switches are provided at 90 degrees from each other, and written characters are recognized by the on/off operation of the detection switches associated with memorization operations. However, in the conventional character recognition device described above, pencil characters are determined so that one character is written divided into four line segments, and the order in which they are written is also determined. For this reason, the user must memorize special characters that are different from ordinary characters, and there are also problems in that the characters are difficult to write and the written characters are difficult to read and are not generally applicable.

In addition, two detection switches are provided around the lead of the writing instrument at 180 degrees from each other, and one detection switch is also provided at the rear end of the lead, and the on/off operation of the three detection switches allows for Devices that recognize characters have also been considered. However, in the conventional device described above, as the number of detection switches increases,
The structure becomes complicated because the core must be held slidably in the vertical direction as well. Furthermore, since the core moves in the vertical direction,
There is a problem that it is difficult to write letters.

The present invention has been made in view of the above points, and has the following advantages: (1) Simplification of the marking structure; and use common characters*
It is an object of the present invention to provide a character recognition device that reliably recognizes and obtains character input.

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows an example of a configuration using a marking tool and a ballpoint pen. In the first closed state 1, the main body of the 11-claw marking instrument has a lead 2 for a pencil pen swingably supported in the main body 1 by a support part 3. Furthermore, an electronic circuit is provided within the main body 1, the details of which will be described later. The ink accommodating portion of the core 2 is made of an insulating member, and the tip portion is configured to have a small diameter. K is set so that it is derived as follows. That is,
A knock button 5 is provided on the head of the main body 1.
By operating this knock button 5, the tip of the lead 1 is moved into the through hole 4.
It is designed to be led out to the first part of the main body or housed inside the main body. Further, on the outer circumferential surface of the main body 1, a display section 6 is provided extending in the longitudinal direction, and a clear lug 7 is also provided. Furthermore, inside the main body 1, there is a core 2.
A pair of pressure sensitive elements, for example, pressure sensitive rubbers 8a and 8b whose resistance value R changes according to the FE force F, are provided so as to be in contact with each other at the small diameter portion 2al of the pressure sensitive elements 8a and 8b, as shown in FIG. The pressure sensitive rubbers 8a and 8b are provided concentrically and circularly around the core 2 as shown in FIG. 3(a).
The position of the easy clip 7 as seen from + is -tIIr, and the rotational deviation is a little to the right.1. (provided in the specified position)

At opposite ends of the pressure sensitive rubbers 8a and 8b,
Small gaps 9a and 9b are provided.

However, in 17, the resistance value of the pressure-sensitive rubbers 8a and 8b changes depending on the pressure applied according to the writing operation, and this change is converted into an electrical signal of 1", '0#, Oki Z, 1111~,
As shown in FIG. 3(1)), the combination of these changes the index direction to [1-1t ``2 j ''.

It is defined as "3". That is, "1" indicates the diagonally lower right direction where pressure is applied only to the pressure sensitive rubber 8a due to the writing action, "2" indicates the diagonal downward direction to the left where pressure is applied only to the pressure sensitive rubber 8b,
The upper right and lower left directions where pressure is applied to both the pressure sensitive rubbers ga and 8b are defined as "3". FIG. 4 shows an example of a combination pattern of car symbol directions rlJ, r2j, r3J for numbers and operation symbols. In this case, between the strokes of each character, the pressure sensitive rubber 8 &.

8bK When no pressure is applied, it is "0") 4
It constitutes a turn. Also, the decimal point is the subtraction symbol “-”
In order to avoid confusion with this, short lines are drawn from right to left so that the Chinese direction is "2".

Next, the structure of the electronic circuit provided in the main body 1 will be explained with reference to FIG. In the figure, reference numeral 11 denotes a switch whose knock in FIG. The power supply voltage V outputted from the power supply circuit 12 is supplied to the input terminal a of the comparator 15.16 via the respective resistors 13.14. Furthermore, pressure sensitive rubbers 8m and 8b in FIG. 1 are connected between the input terminal a of the comparator 15, 16 and the ground. Also, comparator 15
The reference voltage vo is supplied to the input terminal 116.

The outputs of the comparators 15 and 16 are then applied to the input ports 17 and the CPU 1 ! 3 and is also input to the pulse detection circuit 19. This pulse detection circuit 19 detects the rising edge and the falling edge of the output signal of the comparator 15. CPU 1B interrupt input 'y11
``a'' is input to INT Z. Upper 81'y Fritsuno Flotsuno 20 is sent or reset by signal 8 from CPU 18.
The output is input to the clear terminal of the timer 23 via the OR circuit 22. This timer 23 is for detecting a break between input characters, and is a timer fritunoflora f2.
The set output of 4 (・ζ starts operation and counts clock pulses φ. When the timer 23 counts a certain number of clock pulses φ, it outputs a carry signal, and C
Interrupt input terminal INT of PU J s,? Enter.

The timer flip flop 24 is controlled by the CPU 1B, and when its Q side output is sent as an operation command to the evening/f mode controller 23,
is input to. This CPo 1 B is the arithmetic control unit AC
U, t-control memo IJROM that stores the famous control glodarum, Renos fi A r for calculation and character recognition.
It includes B r C * X s Y, Z-, address register ad, and flag F. Then, the above CPU
A pattern memory 25 is connected to J8. The /4' turn memory 25 stores input characters, such as character data such as numbers and functions, as shown in FIG. 4, and their standard arm turns. The contents of the pattern memory 25 are the address registers ad,
CPU II according to the address data set in
It is read out by I. Then, the display data output from the CPU 1B is sent to the data sofa 26 and displayed on the display unit 6. Further, a buzzer 27 is connected to the CPU J 8 to notify, for example, of errors, completion of recognition, etc.

Next, the operation of the above embodiment will be explained. The character input 5 is operated to lead the tip of the lead 2 to the outside through the through hole 4 of the main body 1. At this time, the switch 1'1 of the electronic circuit shown in FIG. 5 provided in the main body 1 is turned on, causing the Ichihara circuit 12 to output an operation signal to each circuit. Then, when a desired character is written using the above-mentioned writing instrument with the click f7 facing forward, the pressure sensitive element ah,
Pressure is applied to 8b, which causes pressure sensitive element ah, 8b
The resistance value changes and character data is input. That is, in diagram #fJ5, when the resistance values of the pressure sensitive elements 8m and 8b change, the human input voltage to the comparators 15 and 16 changes, and the reference voltage V. Comparator 15.1
'1' signal is output from 6. If 11, the number '7' is output.
The signal T2 is output. When the number "7" is entered manually, the first stroke is in the direction of "3" and the pressure sensitive elements 8a, 8
Pressure is applied to both of a and a, Tl + T2 become "1#", and thereafter, between the first stroke and the second stroke becomes MO.

The second stroke initially moves the pressure sensitive element 8a in the direction [1,j
Pressure is applied only to the signal T1, and only the signal T1 becomes 6 bits. Then, in the second half of the second stroke, the pressure sensitive element 8 is moved in the direction of "3".
Pressure is applied to both m and 8b, and the signal TILT! Both become '1#. - Output signal T of the comparator z5, 16
l*'r, is connected to CPU 1 via input port 17
B and written to register X. In this case, the signal Tl is written to the first digit X1 of register X, and the second digit
Signal T at 2! is written. In addition, the comparator 15.1
The output signal Ti*'r of 6 is the pulse detection circuit 19
As shown in FIG.
via the interrupt input terminal INT1 of CPII1B
is input to. The AND circuit 21 is normally supplied with the ``'1m signal from the interrupt flip-flop 20, and the f-
) is held open. Also, the comparator x
The output of s, 16 is sent to the timer 23 as a clear signal via the OR circuit 22. However, the above CPU J
When the "l" signal is input to the interrupt input terminal lNTl, & performs interrupt input processing according to the flowchart shown in FIG. 7, and inputs the character 1? according to the character input. Create a turn.

That is, the CPU f8 is Stella 7'A shown in FIG.

As shown in FIG. 2, first, the interrupt fritsuno frog 20 is reset, the dart of the AND circuit 21 is closed, and subsequent interrupt inputs are prohibited. Next, as shown in Stella fA2, it is determined whether or not the timer flip-frog 24 has been reset, and if it has been reset by 1, the process proceeds to step A3, where the timer flip-frog 24 is set, and then the process proceeds to step A4. Also, if 44J is disconnected when timer frizzoflo f24 is set in step A2,
Proceed directly to step A4 above.

In this step A4, the contents of register Y are carried up by one digit, and then in step A, as shown in FIG. The input r held at port 17 is transferred to register X.

In this case, the signal T1 from the comparator 15 is
Reading digits X and K, signal T from comparator 16! is read into the second digit of register X, X3. After that, proceed to Stella fA7, determine whether the contents of the X1 digit of register X are '1' or '0', and if '1#', flag FK
After setting "l#", the process proceeds to step A9. If it is determined in the stellar 7'A that the content of X1 is 0, the process immediately proceeds to step A. This Stella fA9
Now, determine whether the contents of the X2 digit of register IO”
If so, "O" is written in the first digit of register Y in step All, and if "1", "1" is written in register Y in step ASS. In addition, if it is determined in step A9 that the content of the
If it is '0#,' then in step A14, '2' is written in the register Y, and if it is '1#, '3' is written in the register Y. Then, the above step All r A
12 * A14 * After completing the processing of the A port, Stella 7'A1. The process proceeds to step Air, and the flag F is set to o2, and the interrupt flag flag 20 is reset in step Air to prepare for the next input.

For example, if the number "7" is input by hand, the signal ' shown in FIG.
rie 'r, is output. Then, in the first stroke, both signals TI and T2 become '1#, so that X 1 pX2 of register X in Stella fA6
1# is written in the digit. Next, the flag FK61m is set in step A8, and the process proceeds to Stella fA13 via step A9. The content of the flag F is determined by this Stella fk, but since the flag FK "1" is set in Stella fAs, from step Ata to Stella 7''A.
Proceeding to l11, direction data "3" is written into register Y. When the first stroke is completed, the outputs of the comparators 5 and 16 both become '0#,' the contents of register Y '3' are incremented by one digit in step A4, and then the , , 0' is written in the X digit.

Therefore, the process then proceeds to step AIG via Stella 7' 11 e As, and the content of flag F is determined. At this point, flag F is 01, so step AI
Proceeding to step All from O, rOJ is written to register Y. As a result, the contents of register F become "30". Subsequently, when the second stroke is input, in the first half, the signal T1 from the comparator 15 is 1#, and the signal T1 from the comparator 16 is
Signal T from! becomes 0", the content "30" of register Y is incremented by one digit in step A4, and in step A6, '1' is written in the X1 digit of register X and 0# is written in the X2 digit. The X1 digit is 1". In the case of step A, proceed to step fA, fA, and set flag FK"1#. Next, in step A, the contents of Xt digit of register X"
'0# is determined, and the process proceeds to step AIO, where the contents of flag F are determined. If flag F is '1#, Stella f
Proceeding to A11, "1" is written to register Y. As a result, the contents of register Y become r301J. Then, in the second half of the second stroke, the comparator 15 t l 6
The output signals TleT2 of both become '1', and step A
After the content "3o1" of register Y is incremented by one digit in Step 4, 1# is written in the X1 digit and (jX+ digit) of register X in Stella 76A6.
, proceed to Stella fA9, and the content of the above X2 digit is "1"
is determined and proceeds to Stella 7°A13. This step A
In la, the content of flag F °゛1# is determined, and Stella
Proceeding to AIS, "3" is written to register Y, and the contents of register Y become r3013J. After that, when the handwritten input of the number "7" is completed, the output signals T1eT2 of the comparator 15916 both become °゛o#, and the register Y is written as "o" in the same way as when moving from the first stroke to the second stroke. " is written, and the contents of register Y are r3.
It becomes 0130J.

On the other hand, while the written input is being performed as described above, the output signals T15T! of the comparators 15 and 16! is sent to the timer 23 via the OR circuit 22, and the timer 23 is cleared each time. However, when the memorization input is no longer performed, the timer 23 is not cleared and the counting operation of the clock pulse φ continues. After a certain period of time has elapsed, the timer 23 outputs a carry signal shown in FIG. 6(,), which is input to the interrupt input terminal INT2 of the CPU l &. CPU 1B has an interrupt input terminal INT
When the signal from the timer 23 is applied to the timer 23, it is determined that the input of one character has been completed, and the input arm turn held in the register Y is recognized according to the flowchart shown in FIG.

First, in step B1 of FIG. 8, the interrupt flag 17 is reset, and in step B2, the timer flag 24 is reset. Thereafter, the process advances to step B3, where the contents of register Y are incremented by one digit and the "0" written in the first digit is truncated. Next is Ste.

Proceeding to step B4, "0" is written in the address register ad, and as shown in step B, address 0 of the pattern memory 25 is designated, pattern data is read out, and written in the register 2. Then, as shown in step B6, the input cover turn held in register Y is compared with the standard arm turn indulged in by Renostar ZK, and if they do not match, the process proceeds to step B7 and the contents of address data ad are r+1j. .

Next, in step B8, it is determined whether the address data held in the address register ad has advanced to the final address of the arm turn memory 25, and if it has not advanced to the final address, the process returns to step B. Thereafter, in the same manner, the standard and mother turns are sequentially read from the mother turn memory 25, and the input A? held in the register Y? Compare patterns.

Then, when a match between the standard No. 9 turn and the Ikappei turn is detected in Stella fB, the process advances to STETSUNO 0B9, the character data for the matching standard No. 9 turn is read from the pattern memory 25, and written into Reno Star AK. Next, proceed to step B1゜, determine whether the contents of register A are a numerical value or a function, and if it is a numerical value, perform value processing in step Bll, and check the result register CK1: whether it is a numerical value or a function. Step B
In step 11, arithmetic processing is performed and stored in register C.

Thereafter, the process advances to Stella fB, 11, where the contents of register C are transferred to data buffer 26 and displayed on display section 6. Then, turn the buzzer 22 on Stella f B14 to j[)l.
II. At the same time, a recognition completion notification is issued, and step B15
The interrupt flip-flop 7'' 20 is set as shown in FIG. 7 to prepare for the next input.

On the other hand, if the input cover pattern does not match the standard pattern and the address data held in the address register ad has progressed to the final address, the process proceeds to step 816, and it is determined whether the flag F is '0' or 1'. If the flag F is 0#, proceed to step 13ty, erase the most significant digit of the character input parent turn held in the register Y, and further set the flag FK''11# in step 13ts, then proceed to step B4. Go back and recognize the formula cutter again.In other words, when inputting characters by an elderly person, the first part of the written input is often distorted.For example, the number "6"
”, “8”, and “9” are entered as shown in the 9th M, the arm turn of the character “6” is r 13132
J, the character nozo turn of "-8" is r3231323J,
The character tree / for r 9 J becomes r32313J, and compared to the Mukujuno arm turn in Figure 4, the most significant digit has an extra t (-C).For this reason, the first character cover turn If the character pattern cannot be recognized and fc1 is not recognized, the most significant digit of the character pattern -C is held in register Y as shown in step 13ty, and after that, step B4
Return to the expression cuckold turn'? I try to do A Ha. If the input character cannot be recognized in the recognition process again, the process goes from Stella fB8 to step B16 and then to step +3t.

Then, the register X e Y t Z and the flag F are cleared, and the buzzer 27 is used to notify the error.

After this, in step 13ts, an interrupt 20 is set, and (I:li is entered) for the next character input.

In the above embodiment, a ballpoint pen is used as the writing instrument, but a sharp-in, fountain pen, etc. may also be used. Further, in the above embodiment, the pressure sensitive elements 8 &, 8b are used to detect the operation of the core member, but other pressure sensitive elements or microswitches may be used. Furthermore, in the above embodiment, the recognition circuit, display section, etc. are provided in the eα marking device main body, but these may be provided outside the basket marking device main body. In addition to calculators, the present invention can also be implemented in devices that perform processing based on input characters, such as letters, numbers, codes, etc., as well as alphabets, katakana, etc. in the same manner as in the above embodiment. can be recognized. In addition, pen input and keyboard may be combined, for example, numbers may be entered by pen and functions may be entered manually using keys.

Further, in the above embodiment, characters are input by actually writing them with a writing instrument, but characters may be input by simply tracing them without actually writing them.

As described above, according to the present invention, character input is detected by a pair of detectors arranged concentrically around the core, which simplifies the structure of the keyboard. I can do it. In addition, we considered four combinations depending on the presence or absence of detection signals from the pair of detectors mentioned above, and learned the character input from the detection and mother turn according to the combination, so that common characters can be input. The used 211 input can be reliably recognized, which has the advantage that the characters are easy to read and the characters that have been written are also easy to see.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show one embodiment of the present invention, and FIG. 1 shows a partial cross-section of the main body of the shell, and FIG. 2 shows the pressure and resistance of the pressure-sensitive comb. Figure 3 (a) is a characteristic diagram showing the relationship between the values and the pressure sensitive rubber 4! A cross-sectional view of the second part, Fig. 3 (b) is a diagram showing the correspondence between the pressure on the pressure-sensitive rubber and the moving direction of the core of the navigation instrument, and Fig. 4 is the input character and its standard 1? Figure 5 is a circuit diagram showing the configuration of the internal electronic circuit.
Figures 6 (,) to (,) are a flowchart for explaining the operation, Figure 7 is a flowchart showing the operation for generating input characters, and Figure 8 is the recognition operation for a cover pattern with characters. FIG. 9 is a flowchart showing an example of a modification pattern of input characters. 1... Writing instrument body, 2... Lead, 3... Support member,
4... Through hole, 5... Knock date button, 6... Display portion, 7... Clip, 8 a, 8 b... Pressure sensitive rubber, 9, 9b... Gap, 11 ...Power switch, 15.16...Comparator, 17...Input port,
18...CPU, 19...Pulse detection circuit, 20.
...Interrupt flip-flop, 23...Timer, 24
...Timer flip-flop, 25...Pattern memo I), 26...D p/? Tsufa O Applicant's agent Patent attorney Takehiko Suzue Figure 4 H0 turn 3 131 132132
3103 313201＼0 turn 10
3 1 102 10303
101・C 31

Claims (1)

[Claims] a main body having a core member that responds to the writing motion of a character; and first and second detection signals arranged concentrically around the core member and outputting first and second detection signals corresponding to the motion of the core member; A detector is inputted with the first and second detection signals, and it detects which of the four states depending on the presence or absence of each detection signal, and recognizes the characters accompanying the bush writing motion. A character recognition device consisting of a recognition circuit and a recognition circuit.