JPH07200716A - Method and device for reading code - Google Patents

Abstract

PURPOSE:To provide the method and device for reading code capable of exactly read a code without being affected by operating speed. CONSTITUTION:A time difference detecting circuit 25 measures and outputs time difference (e) of code reading start between both sensors 7 and 8 from the input time difference between signals [(b) and (d)] from both flip-flops 33 and 34. A division circuit 26 divides this time difference (e) by '3' as a number of digits showing the arranging gap of first and second sensors and outputs a quotient (f). This quotient (f) is used as the initial cycle of a sample pulse (u) from a sample pulse generating circuit 39 by being selected with selecting circuits 30 and 38 just after the reading of the code is started. A sample/hold circuit 43 samples/holds the output signal of the second sensor at timing corresponding to the sample pulse (u), and a shift register 44 successively stores these output signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a code reading method and a code reading device for reading a code by manual operation.

[0002]

2. Description of the Related Art Conventionally, a code such as a picture book is printed with a code consisting of binary data, and the code is optically read,
An educational learning system that outputs a sound corresponding to a picture in a picture book has been proposed. In this learning system, a so-called mouse-shaped operating device is used to read the code. In this operating device, for example, a UV arc tube that radiates ultraviolet rays to the outside, a light receiving portion that receives light from a code printed with fluorescent ink that emits visible light when ultraviolet rays are radiated, and the like are arranged. .

In such a configuration, when the operating device is gripped and slid on the surface of the paper on which the code is printed, whereby the code is irradiated with ultraviolet rays from the UV arc tube,
The code excites and emits visible light. The visible light is detected by the light receiving unit and converted into an electric signal, and sound is emitted based on the electric signal.

[0004]

However, in such an operating device, the speed at which the light receiving section moves on the code is not constant because it is manually operated when reading the code. Therefore, when reading a code in which each digit of data is printed without a gap, the position of each digit may be erroneously recognized due to a change in speed, and the content of the data indicated by the code cannot be read accurately.

The present invention has been made in view of such conventional problems, and is not affected by the operation speed.
An object of the present invention is to provide a code reading method and a code reading device that can read a code accurately.

[0006]

In order to solve the above problems, according to the present invention, one of the binary data is detected and turned on when the code consisting of the binary data is read by the manual operation. The operating first and second sensors are arranged at a predetermined interval, the speed of the manual operation is calculated based on the difference in ON time between the two sensors, and the sensor is operated at a cycle corresponding to the calculated speed of the manual operation. The gist is to capture the state of.

[0007]

In the above structure, when the first sensor and the second sensor are moved in the order in which the digits of the code are arranged,
After the first sensor is turned on, the second sensor is turned on. At this time, since both sensors are arranged at a predetermined interval, the interval is known. Therefore,
The speed of the manual operation can be obtained from the known interval and the difference in the ON time of both sensors. Then, if the state of the second sensor is taken in at a cycle corresponding to the calculated moving speed, the binary data forming the code can be read without being influenced by the moving speed.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the reading device 1 includes an operating device 2
And a device body 4 electrically connected to the operating device 2 via a connecting wire 3. The operating device 2 includes
As shown in FIG. 2, a switch 17 is provided at the front end, and a rectangular window portion 6 is opened on the lower surface 5 of the switch 17, and an edge portion of the window portion 6 is provided with a space described later. The first sensor 7 and the second sensor 8 are arranged in parallel. Further, a UV luminous tube 9 is arranged inside the operating device 2, and both sensors 7 and 8 are visible when the phosphor contained in the fluorescent ink is excited by the ultraviolet rays from the UV luminous tube 9. It consists of a photo sensor that can detect light.

FIG. 3 is a block diagram showing the overall configuration of the reading device 1. In this block diagram, a control unit 10 controls a drive circuit 11 for driving the UV arc tube 9 and controls all of the reading device 1 on the basis of a program or the like stored in a storage unit 12. Run. The waveform shaping circuits 13 and 14 shape the outputs of the sensors 7 and 8 into rectangular waves, and the data determination unit 1
5 determines the data indicated by the read code based on the rectangular waves input from the waveform shaping circuits 13 and 14, and outputs the data to the control unit 10.

In the storage unit 12, voice data is stored for each data indicated by each code together with the program. This voice data is, for example, a cry corresponding to a picture of an animal printed on a picture book described later, a story of the picture book, and the like. Then, based on the data indicated by the code input from the data determination unit 15, the control unit 10 reads the audio data corresponding to the data from the storage unit 12 and generates the audio waveform. Audio output unit 1
Reference numeral 6 is composed of an amplifier for amplifying the audio waveform, a speaker driven by the output from the amplifier, and the like.

The codes to be read in this embodiment will be described in advance. As shown in FIG. 4, a predetermined page of the picture book 50 is indicated by a solid circle, a bar, a square or the like on the paper surface 51 thereof. Visible print portions 52 such as abbreviated pictures, figures, and characters are printed and formed at a plurality of locations. The visible printing portion 52 is offset printed with the process ink and is visible in a natural state. Further, on the paper surface 51, a code 53 is printed by a transparent fluorescent ink that emits visible light of a predetermined wavelength when irradiated with ultraviolet rays so that at least a part of the code 53 overlaps the predetermined visible printing portion 52. There is. As shown in FIG. 5, the code 53 has a 10-digit configuration in which each area having an equal interval D corresponds to a digit of data. Further, in the area of 10 digits, the shaded area is "1" and the blank area is "0", and the first digit and the last digit are always "1". Then, the first sensor 7 and the third sensor 8 are
The codes 53 are arranged in parallel at intervals corresponding to three digits (3D).

FIG. 6 shows the configuration of the data judging section 15. The output of the first sensor 7 via the waveform shaping circuit 13 is given to the edge detection circuit 21 and the waveform shaping circuit 14 is supplied. The output of the second sensor 8 via the above is given to the edge detection circuit 22 and the sample / hold circuit 43. The both edge detection circuits 21 and 22 output the pulses (a, c) to the flip-flops 23 and 24 in response to rising and falling of the signals from the sensors 7 and 8, respectively.
Output to.

The flip-flops 23 and 24 output signals (b, d) which become high when the sensors 7 and 8 start reading the code 53, and the time difference detection circuit 25 is provided.
Is a signal (b, from both flip-flops 23 and 24).
From the input time difference of d), the time difference (e) of the code reading start of both sensors 7 and 8 is measured and output. Division circuit 2
6 divides this time difference (e) by "3", which is the number of digits indicating the interval between both sensors 7 and 8, and outputs a quotient (f). This quotient (f) is selected by the selection circuits 30 and 38 immediately after the code reading is started,
It is used as the initial period of the sample pulse (u) from the sample pulse generating circuit 39. In addition, sw in the figure
Is a signal which is high while the switch 17 is being pressed, and φ is a clock pulse.

The output signals (a, c) of the edge detection circuits 21 and 22 are passed through the OR gate 27 (g).
Is the pulse interval measuring circuit 28, and the pulse interval corresponding to the time between the changing points of the signal of the first sensor output or the second sensor output is measured, and the measured value (l) is the dividing circuit 31 and the digit calculating circuit. And 29. The digit calculation circuit 29 outputs the measured value (l) to the cycle (k) corresponding to the current sample pulse (u) output from the selection circuit 30 (the quotient (f) immediately after the start of reading).
Calculate the pulse interval measurement value (l), that is, how many digits the interval between two consecutive change points of both sensor output signals was, by dividing by 1 and rounding off the first digit of the quotient. To do. The division circuit 31 divides the measured value (l) of the pulse interval by the number of digits (m) from the digit calculation circuit 29 to obtain a new cycle (n) of the sample pulse (u).

On the other hand, the output (h) of the delay circuit 32 to which the signal (d) from the flip-flop 24 is given is given to the AND gate 33 together with the signal (g) from the OR gate 27. Output of this AND gate 33 (i)
The signal (j) from the flip-flop 34 to which the input signals and sw are input is given to the selection circuit 30. Therefore, this signal (j) indicates whether or not there is a change in the signal of the first sensor 7 or the second sensor 8 after the second sensor 8 starts reading the code, and the selection circuit 30 outputs this signal. While (j) is low, the quotient (f) is selected as the period of the sample pulse, and after it becomes high, the division circuit 31
, A new cycle (n) sequentially obtained is selected as the cycle of the sample pulse. The delay circuit 32 includes an OR gate 27.
The signal (d) from the flip-flop 24 is delayed by a minute time in order to eliminate the pulse at the start of reading of the second sensor 8 from the signal (g) from the signal (g). ), Which is slightly longer than the pulse width, and is extremely short compared to the pulse interval.

On the other hand, the division circuit 35 has a value (k) indicating the cycle of the sample pulse (u) output from the selection circuit 30.
Is divided by 2, and the value of 1/2 cycle (o) is given to the selection circuit 38 together with the value (k) indicating the cycle of the sample pulse (u). Further, the signal (q) input to the selection circuit 38 via the AND gate 36 and the flip-flop 37 indicates whether or not the period (corresponding to (r)) of the sample pulse (u) has just been updated. is there. Then, the selection circuit 38 selects the half cycle (o) immediately after the cycle update based on this signal (q), and selects the value (k) indicating the cycle otherwise, Is output as a cycle (r) to the sample pulse generating circuit 39. Therefore, the sample pulse generation circuit 39 outputs the sample pulse (u) with a half cycle only immediately after the update of the sample pulse, and as a result, immediately after the update, in the middle of the area corresponding to each digit of the code 53. ,
A read signal is obtained.

Flip-flop 42 and AND gate 4
1 is for supplying the clock pulse (t) to the sample pulse generating circuit 39 only after the switch 17 is pressed until the reading of the code 53 is completed. That is, when the pulse (v) indicating the cycle counting start timing is supplied from the OR gate 40, the sample pulse generating circuit 39 is triggered by this pulse (v) and the clock pulse (t) supplied from the AND gate 41. Is counted. Then, when the count value reaches the cycle (r), the sample pulse (u) is output, and the sample pulse (u) indicates the timing at which the output of the second sensor 8 is held.

The sample / hold circuit 43 samples / holds the output signal of the second sensor 8 at the timing corresponding to the sample pulse (u) output from the sample pulse generation circuit 39, and the shift register 44 outputs the sample / hold signal. Are sequentially stored. The pulse counting circuit 45 outputs the sample pulse (u) output from the sample pulse generating circuit 39.
Is counted, and the pulse (y) is output at the time when the reading of the tenth code, that is, one code 53 consisting of ten digits is completed. The control unit 10 reads the value of the shift register 44 by using this pulse (y) as a trigger,
Recognize the code that has been read.

In the present embodiment having the above-mentioned structure, the code 53 on the paper surface 51 is printed with the transparent fluorescent ink, so it cannot be visually inspected. However, as described above, since the code 53 is partially formed by printing so as to overlap the predetermined visible print portion 52, the corresponding visible print portion 52 should be used as a guide when reading the code. The operating device 2 is slid on the paper surface 51. At this time, while pressing the switch 17, the sensors 2 and 8 are operated in a direction orthogonal to the bar representing each digit of the code 53 and in a direction in which the first sensor 7 precedes (operation direction in FIG. 2). Move the device 2. Thereby, the ultraviolet ray from the UV arc tube 9 is applied to the code 35 through the window 6, the code 53 is excited, and the visible light is sequentially detected by both the sensors 7 and 8.

Then, as shown in the time chart of FIG. 7, the output of the first sensor 7 precedes to high, and in synchronization with this, the pulse (a) is output from the edge detection circuit 21 and the switch 17 The output signal (b) of the flip-flop 23, which has been reset in response to the rising of the signal SW from, becomes high. Next, the second sensor 8
Output becomes high, and in synchronization with this, the edge detection circuit 2
4 outputs a pulse (c), and the output signal (d) of the flip-flop 24 also goes high. Then, the time difference detection circuit 5 outputs t ₀ as the input time difference (e) of the signals (b, d) of both flip-flops 23, 24,
The division circuit 26 divides this by 3 and outputs a quotient (f) = t _0/3 .

The signal (g) passed through the OR gate 27
Becomes a pulse at a timing when both sensors 7 and 8 change, and the output (h) of the delay circuit 32 becomes high with a slight delay after the first rising of the second sensor 8. The output (i) of the AND gate 33 becomes high in synchronization with the signal (g) after the output (h) of the delay circuit 32 becomes high, and the output (j) of the flip-flop 34 becomes the AND gate 33. Goes high when the output (i) of is first high.

Until the output (j) of the flip-flop 34 becomes high, the selection circuit 30 selects t _0/3, which is the value of (f), as its output (k) and becomes high thereafter. Selects a new cycle (n) from the division circuit 31. Therefore, (k) changes to the same value at the same timing as (n) described later after the output (j) of the flip-flop 34 becomes high.

Measurement value (l) of the pulse interval measuring circuit 28
At the timing when the signal (g) passed through the OR gate 27 becomes high, it changes to t ₁ , t ₂ , t ₃ , t ₄ , t ₅ which are the values indicating the pulse interval with the previous high, Digit calculation circuit 29
Since the number of digits (m) output from is a value obtained by dividing the measured value (l) by the output (k) of the selection circuit 30, in synchronization with this measured value (l), 2 in this example. , 1, 3, 1, 2
And changes. Further, the new cycle (n) from the division circuit 31 is obtained by calculating the pulse interval measurement value (l) in the digit calculation circuit 29.
Since the quotient obtained by dividing the number of digits (m) from, t _{1/2,
t 2, t 3/3,} t 4, t 5/2 and changes the output of the divider circuit 35 (o), since a half of _{(k), t 0/6} , t 1/4,
_{t 2/2, t 3/} 6, t 4/2, changes t _5/4.

The output (p) of the AND gate 36 is
In synchronization with (g) after (d) becomes high, the signal (q) from the flip-flop 37 sequentially indicates that the signal has just been updated by high, and the cycle (r) output from the selection circuit 38. Is (o) when (q) is high, and the others are (k). Accordingly, the output of the selection circuit 28 (r) is, t _0/6 and _{t 0/3, t 1/} 4 and t _1/2, · · · as, 1/2 of the period of sequential changes in the cycle It changes while adding to the front. Further, the output (s) of the flip-flop 42 maintains high in synchronization with the switch 17,
The output (t) of the ND gate 41 becomes a clock pulse synchronized with φ.

The sample pulse (u) from the sample pulse generating circuit 39 is sequentially generated when the count value of the clock pulse (t) becomes a value corresponding to the cycle (r). Further, the output (w) of the sample hold circuit 43
Changes as shown by holding the output of the second sensor 8 at the timing of the sample pulse (u), and the shift register 44 shifts the sample hold circuit 43.
The hold state of is stored at the timing of the sample pulse (u). Further, the pulse (y) from the pulse counting circuit 45 is generated at the timing when the number of sample pulses (u) becomes 10, and at this time, the shift register 44 has
10-digit data (in this example, "110111000"
1 ”) is stored.

Then, the control section 10 reads the 10-digit code data (x) from the shift register 44 upon the occurrence of the pulse (y), and the code data (x) is read.
The voice data corresponding to is read from the storage unit 12. Subsequently, a voice waveform is generated based on this voice data and the audio output unit 16 is driven, so that a voice corresponding to the read code data (x) is generated from the audio output unit.

In the embodiment, the case of reading the code printed with the fluorescent transparent ink excited by ultraviolet rays is shown. However, even if the code is normally printed with the visible ink, it can be read by the irradiation light and the sensor. Needless to say, the detection light may be visible light or infrared light.
The distance between the first sensor and the second sensor may be a distance other than three digits.

[0028]

As described above, according to the present invention, the speed of the manual operation is obtained from the difference in the ON time of the pair of sensors having the predetermined number of digits of the code, and the speed of the manual operation is determined according to the obtained speed of the manual operation. Since the state of the sensor is taken in at a predetermined cycle, the code can be read accurately without being influenced by the operation speed.

[Brief description of drawings]

FIG. 1 is a side view showing a reading device according to an embodiment of the present invention.

FIG. 2 is a bottom view of the operating device.

FIG. 3 is a block diagram of a reading device.

FIG. 4 is a perspective view of a picture book used in this embodiment.

FIG. 5 is a diagram showing a code printed and formed on the picture book.

FIG. 6 is a circuit diagram of a data determination unit in the block configuration diagram of FIG.

FIG. 7 is a time chart showing the operation of the data determination unit.

[Explanation of symbols]

 1 Reading Device 2 Operating Device 7 First Sensor 8 Second Sensor 15 Data Judgment Unit 25 Time Difference Detection Circuit 29 Digit Calculation Circuit 39 Sample Pulse Generation Circuit 53 Code

Claims (8)

[Claims] 1. A code reading method for reading a code consisting of binary data in accordance with a manual operation, wherein first and second sensors which detect one of the binary data and are turned on are set at predetermined intervals. Based on the difference in the ON time of both sensors, the speed of the manual operation is determined,
A code reading method characterized in that the state of the sensor is taken in at a cycle corresponding to the speed of the obtained manual operation. 2. The code is composed of binary data for each equally spaced region corresponding to a digit, and the two sensors are arranged at intervals of a predetermined digit number. Code reading method. 3. The code reading method according to claim 1, wherein the state of either one of the both sensors is captured. 4. The code reading method according to claim 1, wherein after the speed of the manual operation is obtained, the cycle is corrected based on a change in the state of the sensor. 5. A code reading device for reading a code consisting of binary data for each area corresponding to a digit in accordance with a manual operation, arranged at a predetermined interval, and detects one of the binary data to turn on. First and second sensors that operate, time difference detection means that detects an on-time difference between the first sensor and second sensor, and the manual operation based on the on-time difference detected by the time difference detection means Calculating means for calculating the speed, pulse generating means for generating a pulse in a cycle according to the speed calculated by the calculating means, and capturing the state of the sensor in response to the pulse generated by the pulse generating means A code reading device comprising: 6. The code is composed of binary data for each equally spaced region corresponding to a digit, and the two sensors are arranged at intervals of a predetermined digit number. Code reading device described. 7. The output means captures and outputs the state of either one of the two sensors.
Code reading device described. 8. The calculating means, after calculating the speed, corrects the value of the speed based on a change in a detection state of at least one of the first and second sensors. The code reading device according to claim 5.