JPH04333995A - Bar code reader - Google Patents

Abstract

PURPOSE:To read only the bar code of merchandise, which is read while being carried by hands, without reading the bar code of merchandise in a tray. CONSTITUTION:A comparison part 40 of a character string inspection part 4 checks the identity of character strings outputted from a character transformation part 3 and outputs the result to a judgement part 42. A generating interval measurement part 41 measures the time interval of generating the character strings outputted from the character transformation part 3 and outputs the measured result to the judgement part 42. While receiving the outputs from the comparison part 40 and the generating interval measurement part 41, when the same inside character string continues at a certain fixed time interval the judgement part 42 does not output the character string to a decoding part 5. Namely, the character string corresponding to a bar code label not to be moved is not outputted to the decoding part 5 by the character string inspection part 4 but only the character string corresponding to a moving bar code label is outputted to the decoding part 5.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barcode reading device for reading barcode symbols pasted or printed on articles.

0002

2. Description of the Related Art A barcode reading device reads a barcode label by irradiating a barcode label on an article with a laser beam or the like and receiving the reflected light. FIG. 3 is a block diagram showing an example of a conventional barcode reading device, in which a scanning unit 1 scans a paper surface on which a barcode label is pasted, the reflected light is received by a light receiving unit 2, and the light is output from the light receiving unit 2. The character converter 3 counts the pulse widths of the electric signals corresponding to the white bars and black bars constituting the barcode, and converts the pulse widths into a character string. Subsequently, the decoding unit 5 synthesizes the character strings to obtain a decoding result, and the I/F control unit 6 outputs the decoding result to an external device.

FIG. 2 is a diagram showing an example of scanning a barcode label in a general barcode reading device. In FIG. 2, if the barcode label 12 moves in the direction of the dashed arrow, the barcode label 12 will be scanned by the scanning beam 11 when it reaches position B, and similarly by the scanning beam 10 when it reaches position C. scanned. In other words, since positions A and D are not scanned, the character converter 3 shown in FIG. 3 outputs a character string only at positions B and C. Here, as shown in FIG. 2, if it is assumed that in addition to the barcode label 12 that moves, the barcode label 13 that does not move is also on the scanning beam 10, the barcode label 13 that does not move is constantly scanned by the scanning beam 10, and the character The converter 3 outputs both the character string corresponding to the barcode label 12 and the character string corresponding to the barcode label 13 to the decoder 4.

0004

[Problems to be Solved by the Invention] In this conventional barcode reading device, when a barcode label that does not move is placed on the scanning beam, the character converter converts the barcode that does not move along with the character string corresponding to the barcode label that moves. Since the character string corresponding to the label is also output to the decoding section, the decoding section cannot determine which character string has been scanned, making it impossible to decode it.

[0005]

[Means for Solving the Problems] The barcode reading device of the present invention includes a scanning section that outputs a scanning beam that scans a barcode label on an article, and a scanning section that receives reflected light from the barcode label and converts it into an electrical signal. a character converting section that converts the electric signal from the light receiving section into a character string; a decoding section that combines and decodes the character string output from the character converting section; and a decoding section that performs decoding by the decoding section. In a barcode reading device comprising an I/F control section that outputs a result to an external device, when the character string with the same content is output from the character conversion section at a fixed time interval, this character string is output to the decoding section. It is equipped with a character string inspection section that does not

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the barcode reading device of the present invention.

The barcode reading device of this embodiment is constructed by additionally connecting a character string checking section 4 between the character converting section 3 and the decoding section 5 of the conventional device shown in FIG. Reference numeral 4 denotes a comparison section 40 for checking the identity of the contents of the character string output from the character conversion section 3, a generation interval measurement section 41 for measuring the generation time interval of this character string; The determination unit 42 determines whether or not to output a character string to the decoding unit 5 in accordance with the output of the decoding unit 41.

Next, the operation of this embodiment will be explained. Here, scanning beams 10 and 11 shown in FIG.
Consider the case where a moving barcode label 12 is scanned by the scanning beams 10 and 11 and a stationary barcode label 13 is scanned by the scanning beam 10. Since the barcode label 12 is scanned when it reaches the positions B and C, the character string corresponding to the barcode label 12 is sent to the character string inspection section 4 from the character converter 3 only when it reaches the positions B and C. is output to. On the other hand, since the barcode label 13 does not move, a character string corresponding to the barcode label 13 is output to the character string inspection section 4 every time it is scanned by the scanning beam 10. In other words, since the scanning beam 10 scans the barcode label 13 at a constant interval, the character string corresponding to the barcode label 13 is outputted to the character string inspection section 4 at the same time interval. Furthermore, since the character strings are scans of the same barcode, they have the same content.

The comparing section 40 checks the identity of the character strings output from the character converting section 3 and outputs the result to the determining section 42 . Furthermore, the occurrence interval measuring section 41 measures the occurrence time interval of the character string output from the character converting section 3 and outputs the measurement result to the determining section 42 . The determining section 42 receives the output of the comparing section 40 and the output of the occurrence interval measuring section 41, and does not output the character string to the decoding section 5 when character strings having the same content continue at a certain time interval. In other words, the character string inspection section 4 does not output the character string corresponding to the stationary barcode label 13 shown in FIG. do. Therefore, since the decoding unit 5 receives only the character string corresponding to the moving barcode label 12, it becomes possible to decode the moving barcode.

0010

As explained above, according to the present invention, even if a tray containing products with barcode labels is placed within the reading range of the barcode reader, the barcodes of the products in the tray will not be recognized. Since it does not move, it cannot be read, and has the effect that only the barcode of the product that is held in the hand and subjected to the scanning operation can be read.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a barcode reading device of the present invention.

FIG. 2 is a diagram showing an example of scanning a barcode label in a general barcode reading device.

FIG. 3 is a block diagram showing an example of a conventional barcode reading device.

[Explanation of symbols]

1 Scanning section 2 Light receiving part 3 Character conversion section 4 Character string inspection section 5　　　　Decoding part 6 I/F control section 10, 11 Scanning beam 12, 13 Barcode label 40 Comparison section 41 Occurrence interval measurement section 42 Judgment section

Claims (1)

[Claims] 1. A scanning unit that outputs a scanning beam that scans a barcode label on an article, a light receiving unit that receives reflected light from the barcode label and converts it into an electrical signal, and a a character converter that converts a signal into a character string; a decoder that combines and decodes the character string output from the character converter;
I/F that outputs the decoding result by this decoding unit to an external device
A barcode reading device comprising a control section includes a character string checking section that does not output the character string to the decoding section when the character string having the same content is output from the character converting section at fixed time intervals. barcode reading device.