JPH0660209A - Bar-code reader - Google Patents

Abstract

PURPOSE:To automatically set a clear area value corresponding to a read distance of a bar-code. CONSTITUTION:A distance measuring circuit 1 measures a distance 107 extending from a bar-code label 10 to a reader 7 on an object 9. A switching signal output circuit 2 outputs switching data 102 for switching to an optimal clear area value by distance data 102 measured by the distance measuring circuit 1. A clear area value setting circuit 3 outputs optimal clear area data 103 by the switching data 102. A clear area detecting signal generating circuit 4 compares the clear area data 103 and white width data 104, and outputs a clear area detecting signal 105 to a bar-code decoding circuit 5, in the case the white width data 104 is larger.

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, the 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 by the distance between the reader and the bar code label of the object, the type of the label and the scanning beam speed is used. Before using the reading device, it has to be set by a dip switch, which is troublesome.

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

[0005]

A bar code reader according to the present invention is most suitable for 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 that outputs a switching signal for switching to a clear area value
A clear area value setting circuit that outputs optimum clear area data by the switching signal, and the clear area detection circuit that compares the clear area data with the white width data and outputs a clear area detection signal when the white width data is large. The barcode reader according to the present invention may be configured to include a barcode type setting signal input circuit for inputting a setting signal corresponding to the type of barcode.

[0006]

The present invention will be described below with reference to the drawings.

FIG. 1A is a block diagram showing an 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 bar code label.

First, the distance measuring device 8 and the distance measuring circuit 1 measure the distance 107 between the barcode reading device 7 and the barcode label 10 attached to the object 9, and the switching signal output circuit 2 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 the clear area data 103 designated 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 uses the white width data 1
04 is compared with the clear area data 103, and if the former is larger, the clear area detection signal 105 is output to the barcode 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 bar code type from the bar code type setting signal input circuit 6, and inputs them to them. 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 the label is set. It is possible to automatically set, and there is an effect that it is not necessary to set the clear area value with the DIP switch before using the reading device.

[Brief description of drawings]

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

[Explanation 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 Bar code decoding circuit 6 Bar code type setting signal input circuit 7 Bar code reader 8 Distance measuring instrument 9 Object 10 Bar code 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)

[Claims] 1. A distance measuring circuit for measuring a distance from a bar code label on an object to a reading device, 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 optimum clear area data in response to the switching signal, the clear area data and white width data are compared, and if the white width data is large, a clear area detection signal And a clear area detection signal generating circuit for outputting the bar code reading device. 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 a bar code type.