JP3069817B2 - Barcode reader - 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 reader.

[0002]

2. Description of the Related Art In a conventional bar code reader, a clear area value is set by a dip switch before using the bar code reader.

[0003]

In the conventional bar code reader, the clear area detection signal generation timing data determined from the distance between the reader and the bar code label of the object, the type of label, and the scanning beam speed is used. Prior to using the reading device, there has been a problem that it has to be set with a dip switch, which is troublesome.

It is an object of the present invention to provide a bar code reader capable of automatically setting a clear area value according to a bar code reading distance.

[0005]

A bar code reader according to the present invention is optimized by a distance measuring circuit for measuring a distance from a bar code label on an object to the reader, and distance data measured by the distance measuring circuit. A switching signal output circuit for outputting a switching signal for switching to a clear area value,
A clear area value setting circuit for outputting optimum clear area data according to the switching signal; and a clear area detection circuit for comparing the clear area data with white width data and outputting a clear area detection signal when the white width data is large. The bar code reading device of the present invention may include a bar code type setting signal input circuit for inputting a setting signal corresponding to the type of the bar code.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1A is a block diagram showing one embodiment of the present invention, and FIG. 1B is a diagram showing an example of a positional relationship between a reading device and an object having a barcode label.

First, the distance 107 between the bar code reader 7 and the bar code label 10 attached to the object 9 is measured by the distance measuring device 8 and the distance measuring circuit 1, and the switching signal output circuit 2 is used as the distance data 101. Is output to Subsequently, the switching signal output circuit 2 outputs the clear area value switching data 102 to the clear area value setting circuit 3 so as to switch to the optimum clear area value according to the value of the distance data 101.

The clear area value setting circuit 3 outputs clear area data 103 specified by the clear area value switching data 102 to the clear area detection signal generating circuit 4. The clear area detection signal generation circuit 4 outputs the white width data 1
04 is compared with the clear area data 103, and if the former is larger, a clear area detection signal 105 is output to the bar code decoding circuit 5.

Further, the clear area value setting circuit 3 inputs both the clear area value switching data 102 and the bar code type setting signal 106 corresponding to the type of bar code from the bar code type setting signal input circuit 6 to these. It is also possible to output the corresponding clear area data 103.

[0011]

As described above, according to the present invention, the distance between the bar code reader and the bar code label is measured for each object, and the optimum clear area value corresponding to the distance and the type of label is determined. Automatic setting can be performed, and there is an effect that it is not necessary to set a clear area value with a dip switch before using the reading device.

[Brief description of the drawings]

FIG. 1A is a block diagram showing one embodiment of the present invention. FIG. 3B is a diagram illustrating an example of a positional relationship between the reading device and an object having a barcode label.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Distance measuring circuit 2 Switching signal output circuit 3 Clear area value setting circuit 4 Clear area detection signal generating circuit 5 Barcode decoding circuit 6 Barcode type setting signal input circuit 7 Barcode reader 8 Distance measuring device 9 Object 10 Barcode label 101 distance data 102 clear area value switching data 103 clear area data 104 white width data 105 clear area detection signal 106 barcode type setting signal 107 distance

Claims (2)

(57) [Claims] 1. A distance measuring circuit for measuring a distance from a bar code label on an object to a reader, and a switching signal for switching to an optimum clear area value based on distance data measured by the distance measuring circuit. A switching signal output circuit, a clear area value setting circuit that outputs optimal clear area data according to the switching signal, and a comparison between the clear area data and the white width data. And a clear area detection signal generating circuit for outputting a signal. 2. The bar code reader according to claim 1, further comprising a bar code type setting signal input circuit for inputting a setting signal corresponding to the type of the bar code.