JP2725617B2 - Barcode hand scanner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bar code hand scanner for optically reading a bar code, and more particularly to a bar code having a function of preventing the same bar code from being read twice or a function of preventing misreading. It relates to a hand scanner.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram of a conventional bar code hand scanner proposed in, for example, Japanese Patent Application Laid-Open Nos. 4-147396 and 4-297969.
1 is a bar code reading circuit that generates bar code data from a bar code read from a bar code label (not shown), 2 is a control circuit that performs control for implementing a double reading prevention function or an erroneous reading prevention function described below, Is a data buffer for temporarily storing barcode data, 4 is a timer for measuring time, and 5 is a data transmission circuit for transmitting barcode data to a host device (not shown).

Next, regarding the operation of such a bar code hand scanner, first, an erroneous reading prevention function will be described. FIG. 4A is a flowchart for explaining this misreading prevention function. First, when bar code data is obtained by the bar code reading circuit 1 (step 100), the control circuit 2 compares and compares the obtained data with the immediately preceding data stored in the data buffer 3 (step 101). It is determined whether they match (step 102). If they do not match, step 10
Return to 0 and wait for bar code data to be read.

[0004] If the values match in step 102, the internal counter is incremented by one (step 10).
4) Subsequently, it is determined whether or not the value of the counter has reached a specified number (step 105). If the value of the counter has not reached the specified number of times, step 1 is performed again.
Return to 00. Next, when the counter reaches the specified number in step 105, the control circuit 2 causes the data transmission circuit 5 to transmit data to the host device (step 10).
6). In this way, the data read immediately before and stored in the data buffer 3 are compared with the newly read data for a specified number of times, and when the same data is continuously obtained for the specified number of times, the data is determined as no erroneous reading. It was sent to the host device.

Next, the double reading prevention function will be described. FIG. 4B is a flowchart for explaining the double reading prevention function. When the barcode data is transmitted (step 200), the control circuit 2 causes the timer 4 to start time measurement (step 201). When the next barcode data is obtained (step 202), the obtained data is transmitted immediately before. It is determined whether the data is the same as the transmitted data (step 204). When the bar code data matches the data transmitted immediately before, the control circuit 2 reads the value of the timer 4 (step 205) and determines whether or not the value has reached a specified time (step 20).
6).

If the specified time has not been reached, the obtained data is discarded without being sent to the higher-level device, and step 2 is repeated.
Returning to step 02, the process waits for the barcode data to be read. If the specified time has elapsed, the data is sent from the data sending circuit 5 to the host device (step 2).
07). In this way, by preventing the same data from being sent to the host device within the specified time, the double reading prevention function is realized. Therefore, in order to read the barcode of the same product again, it is necessary that the specified time has elapsed since the barcode was once read.

[0007]

As described above, the double-read prevention function of the conventional bar code hand scanner is realized by not transmitting the same data to the host device within a specified time, so that the operator is not required. In particular, when the same product is read twice intentionally, the bar code cannot be read until after a specified time has elapsed, and there has been a problem that reading becomes slow. Further, since the misreading prevention function is also realized by collating data for a specified number of times, there has been a problem that reading is slowed.
The present invention has been made to solve the above problems,
It is an object of the present invention to provide a barcode hand scanner capable of increasing the processing capacity.

[0008]

According to the present invention, there is provided a reading circuit for generating bar code data from a read bar code, a timer for measuring time, an accelerometer for detecting a moving state, and a bar code. A data transmission circuit that transmits data to the host device, and a timer that starts time measurement after the data transmission is performed. If the timer value is within a specified time, the same data is not transmitted and the accelerometer is used. When the obtained acceleration changes from the first predetermined value or more to the second predetermined value smaller than the first predetermined value,
A control circuit for determining that the same barcode has been read twice and intentionally transmitting the data from the data transmission circuit to the host device even when the timer value is within the specified time.

Further, a reading circuit for generating bar code data from the readings taken barcode, and accelerometers for detecting the moving state, a data transmission circuit for transmitting the bar code data to the host device, resulting immediately before The obtained barcode data is compared with the newly obtained barcode data, data is not transmitted until the same data is obtained continuously for the specified number of times, and the acceleration obtained by the accelerometer is equal to or less than a predetermined value. In this case, there is provided a control circuit that determines that there is no erroneous reading and sends data from the data sending circuit to the host device even if the number of times has not reached the specified number.

[0010]

According to the present invention, the moving state is determined based on the information of the accelerometer, and if it is determined that the same bar code is intentionally read twice, the same bar code is read within the specified time of the double reading prevention function. Even if it is, the bar code data is transmitted. Further, when the acceleration changes from the first predetermined value or more to the second predetermined value or less, the control circuit determines that the same bar code is intentionally read twice, and the timer value is read twice. The bar code data is transmitted even within the specified time of the prevention function.
If the moving state is determined based on the information of the accelerometer and it is determined that there is no erroneous reading, the barcode data is transmitted even if the prescribed number of times of the erroneous reading prevention function has not been reached. Further, when the acceleration is equal to or less than a predetermined value, the control circuit determines that there is no erroneous reading, and transmits the barcode data even if the number of times of the erroneous reading prevention function has not been reached.

[0011]

FIG. 1 is a block diagram of a bar code hand scanner according to an embodiment of the present invention. The same components as those in FIG. 3 are denoted by the same reference numerals. Reference numeral 2a denotes a control circuit similar to the control circuit 2 in FIG. 3, and it has been determined that the same barcode has been intentionally read twice based on the information of the accelerometer 6 for detecting the moving state of the barcode hand scanner. In this case, the barcode data is transmitted to the host device even within the specified time, and if it is determined that there is no misreading based on the information of the accelerometer 6, the barcode data is transmitted even if the specified number of times has not been reached. Is sent.

Next, regarding the operation of such a bar code hand scanner, first, an erroneous reading prevention function will be described. FIG. 2A is a flowchart for explaining this misreading prevention function. First, the barcode reading circuit 1 reads a barcode from a barcode label to generate barcode data. The control circuit 2a stores the obtained data in the data buffer 3.

Next, when the same reading is performed and bar code data is obtained (step 100), the control circuit 2a
Compares the obtained data with the immediately preceding data stored in the data buffer 3 (step 101), and determines whether or not they match (step 102). And
If they do not match, the process returns to step 100 again and waits for barcode data to be read.

If they match in step 102, the control circuit 2a checks the output of the accelerometer 6 to determine whether the acceleration is below a predetermined value (step 10).
3). If the acceleration is larger than the predetermined value, the determination is NO and the internal counter is increased by 1 (step 104).
Subsequently, it is determined whether or not the value of the counter has reached a specified number (step 105). If the value of the counter has not reached the specified number, the process returns to step 100 and waits for the barcode data to be read.

Therefore, when the barcode data continuously matches and the acceleration is larger than a predetermined value when the scanning is continuously performed, the value of the counter is sequentially increased, and eventually the number of times reaches the specified number. Reach. When the counter reaches the specified number in step 105, the control circuit 2a causes the data transmission circuit 5 to transmit data to the host device (step 106). The above operation is the same as the example in FIG. 3 except for the acceleration determination in step 103.

Next, when the acceleration is equal to or less than the predetermined value in step 103, the control circuit 2a causes the data transmission circuit 5 to transmit the obtained barcode data to the host device (step 106). As described above, data is transmitted when the acceleration is equal to or less than the predetermined value. When the acceleration change is large and the movement amount of the barcode hand scanner is large, the possibility of erroneous reading is large, but the acceleration is small and the movement amount is small. This is because when there is almost no possibility that misreading will occur.

Therefore, when the acceleration is equal to or less than a predetermined value, it can be determined that there is no erroneous reading. If data is sent when such an acceleration determination is made, the reading speed can be increased without lowering the reliability of the erroneous reading. Can be.

Next, the double reading prevention function will be described. FIG. 2B is a flowchart for explaining the double reading prevention function. When transmitting the barcode data (step 200), the control circuit 2a causes the timer 4 to start time measurement (step 201).

When the next reading is performed and bar code data is obtained from the bar code reading circuit 1 (step 2).
02), the control circuit 2a checks the output of the accelerometer 6 to determine whether the acceleration is equal to or less than the second predetermined value. Check if it was measured. In this way, it is determined whether or not the change in acceleration starting before the bar code is read has changed from the first predetermined value or more to the second predetermined value or less (step 203).

If the determination of acceleration is NO, it is determined whether or not the obtained bar code data is the same as the data transmitted immediately before (step 204). It is sent to the host device (step 207). When the barcode data matches the data transmitted immediately before in step 204, the control circuit 2a reads the value of the timer 4 (step 205) and determines whether the value has reached a specified time (step 206). ).

If the specified time has not been reached,
The obtained barcode data is discarded without being sent to the host device, and the process returns to step 202 again to wait for the barcode data to be read. If the specified time has elapsed, the data is sent from the data sending circuit 5 to the host device (step 207). The above operation is performed in step 20
3 is the same as the example of FIG.

Next, when the control circuit 2a determines in step 203 that the acceleration has changed from the first predetermined value or more to the second predetermined value or less, the control circuit 2a transmits the bar code data from the transmission circuit 5 to the host device. (Step 207).
As described above, when the acceleration changes from the first predetermined value or more to the second predetermined value or less, the data transmission is performed when the operator intends to read the same product twice, as described above. This is because it is considered that the barcode hand scanner is moved in the moving state. Therefore, by sending data when such an acceleration change occurs, double reading of the same bar code can be speeded up.

[0023]

According to the present invention, the movement state of the barcode hand scanner is determined based on the information of the accelerometer, and if it is determined that the same barcode has been intentionally read twice, it is determined twice. Since data is sent even within the specified time of the reading prevention function, even if the operator intentionally reads the same product twice, there is no need to wait for the specified time to elapse each time the bar code is read. , High-speed reading becomes possible. Also, the control circuit determines that the acceleration is the first.
When the value changes from the predetermined value or more to the second predetermined value or less,
Since it is determined that the same barcode has been intentionally read twice and the data is transmitted, the reading speed of the same barcode can be easily increased.

Also, the moving state of the barcode hand scanner is determined based on the information of the accelerometer, and if it is determined that there is no misreading, the data is transmitted even if the number of times of the misreading prevention function has not reached the specified number. The reading speed can be increased without lowering the reliability of. Also,
When the acceleration is equal to or less than a predetermined value, the control circuit determines that there is no erroneous reading and sends the data, so that the reading speed can be easily increased without lowering the reliability of the erroneous reading.

[Brief description of the drawings]

FIG. 1 is a block diagram of a bar code hand scanner according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining an erroneous reading prevention function and a double reading prevention function of the barcode hand scanner of FIG. 1;

FIG. 3 is a block diagram of a conventional barcode hand scanner.

FIG. 4 is a flowchart for explaining an erroneous reading prevention function and a double reading prevention function of the barcode hand scanner of FIG. 3;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bar code reading circuit, 2a ... Control circuit, 3 ... Data buffer, 4 ... Timer, 5 ... Data transmission circuit, 6 ...
Accelerometer.

Claims (2)

(57) [Claims] To 1. A To prevent reading twice read the same bar code, within the specified time in barcode hand scanner with a prevention function read twice not send the same data to the host device, a bar code read Generate barcode data from
A reading circuit, a timer for measuring time, an accelerometer for detecting a moving state, and a data transmission circuit for transmitting barcode data to a host device.
When the start of time measurement timer after the data transmission is performed
If the timer value is within the specified time, the same data
Is not sent out, and the acceleration obtained by the accelerometer is not
The speed is not less than the first predetermined value and less than the first predetermined value.
If it changes below the predetermined value of 2, the same bar code
Determined that the reading was intentionally performed twice, and the timer value was specified.
Even within the time, data is sent from the data transmission circuit to the host device.
Barcode hand scanner, characterized in that a control circuit for delivering to. 2. The same barcode data continues for a specified number of times.
Misreading protection that does not send data to a higher-level device until obtained
Generate barcode data from the read barcode in a barcode hand scanner with a stop function
A reading circuit, an accelerometer for detecting a moving state, and a data transmission circuit for transmitting barcode data to a host device
And the barcode data just obtained and the newly obtained bar
Check the code data for the same data
Data is not sent until the
If the acceleration obtained by
A barcode hand scanner, comprising: a control circuit for determining that no reading is performed and transmitting data from a data transmission circuit to a higher-level device even if the number of times has not been reached .