JPS59776A - Data input system using bar code - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a data input method using barcodes. Guidance control is implemented in which an unmanned vehicle determines its own operation based on various data obtained by optically scanning and reading the bar code using a device.

By the way, in the conventional method described above, the width of the black and white stripes constituting the bar code is determined by measuring the duration of the binary signal output by the reader, and the A-code is determined based on the determination result. I am trying to reorganize the data. Therefore, if the speed of the unmanned vehicle changes significantly or if the reader reads the barcode at an angle, the timing results will change significantly, resulting in an error in determining the width of the stripe and causing data to be lost. A problem arose in that accurate reconstruction was not possible.

An object of the present invention is to provide a data input method using barcodes that can solve the above-mentioned problems.

In order to achieve the above object, the present invention provides two types of marks of the same color with different widths in the scanning direction in a predetermined arrangement manner in the scanning direction, and at the boundary between these marks, the marks of the same color and the same color are provided. uses a barcode with a distinguishable mark of another color in between, and when reading the barcode, it detects the width of the first mark of the two types of marks mentioned above. is set as a reference width, and the widths of the two types of marks that will appear thereafter are compared with the reference width to convert those marks into binary data.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an example of a barcode BC used in the method according to the present invention. In the barcode BC, the width W
The white marks Mll and M13 have the data "0#" and the white marks M12°Ml4 and M13 have the width W2, respectively.
M16 receives data "1", and these white marks M, 1-M1ll correspond to black marks M21 to M25.
It is separated by υ. Furthermore, a white mark MI of width Wl
A reference mark O is formed adjacent to the black mark M21.

That is, the bar code BC represents 5-bit binary data ro1011J.

FIG. 2 shows an example of a data input device that reads the bar code BC and outputs the data written therein (r01011J in this case).

In the figure, a reader 1 is equipped with a light emitting element such as a light emitting diode (not shown) and a light receiving element such as a phototransistor, and the light emitted from the light emitting element is irradiated onto the barcode BC, and the reflected light is is configured to be received by the light receiving element.

The output of the light receiving element corresponding to the intensity of the reflected light, that is, the output read signal SR of the reader 1 is input to the input terminal of the integrator 2 and the clock input terminal CK of the counter 3.

D-Clock input terminal CK of a free lag flop (hereinafter simply referred to as a flip-flop) 4 and a shift clock of a shift register 6 via an inverter 5;

and are respectively applied to the input terminal CK.

The read signal SR becomes a high level signal (logical level "H") when the light receiving element receives the light reflected by the white marks M1o-Ml, and the read signal SR becomes a high level signal (logical level "H") when the light receiving element receives the light reflected by the white marks M1o-M1. When the reflected light is received, the signal becomes a low level signal (logical level "L").

Therefore, when the barcode BC is moved at a constant speed along the scanning direction by the reader 1 as shown in FIG.
At the time t1 when the reader 1 reads the IO, the read signal S
R (see (b) in the same figure) is logically raised to "H", and the count value of the counter 3 becomes [month]. This results in
Since the counter 3 outputs the signal SD to switch the switch circuit 7, the output signal SI of the integrator 2 (see (c) in the same figure) is applied to the peak holding circuit 8 via the switch circuit 7. It will be done.

Then, at time t2 when the reader 1 finishes running the white mark Mlo, the read signal SR reaches the logic level rLJ.
This causes the integrator 2 to be reset. Therefore, the peak holding circuit 8 holds the magnitude of the output signal SI of the integrator 2 corresponding to the width Wl of the white mark MlG. Then, the output signal SP of the peak holding circuit 8 (see FIG. 3(d)) and the output signal SI of the divider 2
is added, and the above point 1. From white mark M
In the period up to the time t3 when the logic level of the read signal SR rises to rHJ based on 11, the signal SC has a magnitude greater than the signal SI (SC≧SP), so the subtraction result of the subtracter 9 is is less than or equal to 0.

Therefore, the output signal SC of the comparator 10, to which the reference voltage is applied to one side input terminal and the output of the subtracter 9 is applied to the + side input terminal, is a signal at the logic level rLJ during the above period (Fig. 3(e) )).

In this way, when the flip-flop 4 is activated at the rising edge of the read signal SR corresponding to the white mark Mlo, the logic level of the signal SC is rLJ, and therefore the output signal SQ of the flip-flop 7'4 is
The logic level of is rLJ. However, the above signal SR
At the timing when the inverted signal surface of rises at the time t2, the shift register 6 stores the signal SC of logic level "L" (that is, data "0") applied to its data input end in the least significant digit (LSB). do.

Then, the reader 1 detects a white mark Ml having a width W.
When the signal SR rises at time t3 after scanning l,
The count value of the counter 3 becomes "2", thereby causing the signal SDt to disappear and the switch circuit 7 to return to the state shown. Therefore, the peak holding circuit 8
The output signal sp becomes a signal having the voltage value of the signal SI at time t2, that is, a signal at a level corresponding to the reference width W.

By the way, during the period from time t3 to time t44 when the reader 1 scans the white mark M I 1, the level of the signal SI does not become higher than that of the signal sp. The logic level of the output signal SC of the comparator 10 is rLJ.

Therefore, in the same way as described above, when the signal level rises at time t4, the shift register 6 shifts the data "0" to LSH.
At the same time, the data previously stored in the LSB is shifted by one digit.

After this, the reader 1 prints the black mark M22 at the time t5.
When the white mark M12 of width W2 is scanned from
is much larger than the reference width Wl, so the level of the signal SI exceeds that of the signal SP at time t6, as shown in FIG. 3(C). Therefore, the output signal SC of the comparator 10 rises to the logic level rHJ (see (e) in the same figure), and at the same time, the output signal SQ of the flip-flop 4 rises to the logic level rHJ (see (f) in the same figure). .

Then, at the time t when the scanning of the white mark M12 is completed,
When the signal level falls at step 7 (see (g) in the same figure), the shift register 6 shifts all stored contents by one digit and at the same time stores data "1" in the LSB.

Therefore, each time the reader 1 sequentially scans the white marks M131M14 and MIS, the shift register 6 shifts the entire stored contents by one digit and simultaneously transfers the data lo%%tllll and II to the LSB by the same action as described above. When the bar code BC is scanned by the reader 1, data ``001011'' is stored in the shift register 6.

Now, when the signal SR rises corresponding to the white mark M15, the counter 3 changes its count to "
6'' and at the same time outputs the signal SD of logic level rHJ to the AND circuit 11. A signal plane obtained by inverting the signal SR by an inverter 12 is applied to the other input terminal of the AND circuit 11, so that the signal plane rises when the reader 1 finishes scanning the white mark MIB. and the output SA of the AND circuit 11 is at logic level rH.
Stand up to J. As a result, the shift register 6
The data stored in the gate circuit 13 is outputted to the next stage data processing section (not shown), and at the same time the peak holding circuit 8 is reset. In addition, the above signal S
A is applied to the reset input R of the counter 3 via the delay circuit 14, thereby resetting the counter 3.

Further, the shift register 6 has a white mark M I
6-bit data including O data is stored, but
In the data processing section, f-) 6 output from the circuit 13
The most significant digit (MSB) data of the bit data, that is, the data related to the white mark M1o is not input.

Furthermore, the reference voltage applied to the comparator 10 is set to a value that can prevent erroneous output from the subtracter 9 when the accuracy of the width of the white mark is low.

Accordingly, the apparatus shown in FIG. 2 can accurately convert the bar code into data even if the accuracy of the width of the white mark is somewhat poor.

In the above embodiment, the width of the white mark is made to correspond to the data of 0" and '°1", and these white marks are separated by the black mark. You can also use marks to separate data. However, the bit length of the information in the barcode is not limited to 5 bits as described above, and the length can be arbitrarily determined, and furthermore, the last bit can be used as a stop bit.

In addition, it is also possible to change the width of the reference mark from W□ to W2, and it is also possible to assign data "1"ZnO" to each width W 1 + W 2. By adding black marks on both sides of the barcode BC shown in Figure 1, the barcode BC is created.
You may make it stand out.

Furthermore, it is also possible to determine the width of the white mark Mll"M2S with a configuration different from that of the embodiment shown in FIG. Even if the pulse width of each mark is measured and the count value of the counter corresponding to the white mark MIO is compared with the count value of the counter corresponding to the white marks Mll to MIS, the width of each mark is can be determined.

As explained above, according to the present invention, a mark having a standard width is formed at the beginning of a barcode, and the width of this mark is compared with the width of each subsequent mark to determine the content of the data. Therefore, even if the speed at which the code is scanned changes each time it is scanned, or the scanning direction is diagonal, as long as the speed while scanning the code is approximately constant, it will be accurate. This has the effect of allowing input of data.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a barcode used in the method according to the present invention, FIG. 2 is a block diagram showing an example of a data input device to which the method according to the present invention is applied, and FIG. Figures (,) show the same barcodes as shown in Figure 1, and Figures (b) to 0] show the barcodes shown in Figure (A) read by the device shown in Figure 2. FIG. 3 is an operation waveform diagram of the above device when the above device is operated. 1...Reader, 2...Integrator, 3...Counter,
4...D-FrizuzoFlotsuno, 6...Shift register, 7...Switch circuit, 8...Peak holding circuit,
9... Subtractor, 10... Comparator, 13... Date circuit, BC... Barcode, Mlo-Ml, --- White mark, M, l-M, 11... Black mark .

Claims (1)

[Claims] Two types of marks of the same color with different widths in the scanning direction are provided in a predetermined arrangement in the scanning direction, and a mark of a different color distinguishable from the color is interposed at the boundary between these marks. Using the code,
When reading the barcode, first detect the width of the mark that appears first among the two types of marks, use this as a reference width, and compare the widths of the two types of marks that appear thereafter with the reference width. A data input method using barcodes, which is characterized by converting those marks into binary data.