Bar Code Reader Technical Guide


Chapter1: Learn the basics of product types.
Techniques and Correct Usage of Bar Code Reader
1. Stationary-type Laser Bar Code Reader
2. Stationary-type CCD Bar Code Reader
Chapter2: Hints on making bar code.
Bar Code Printer and Bar Code Label
1. Bar Code Printing Methods
2. Details of Thermal Printers
3. Bar Code Verifier
Appendices: Adovanced course of bar code.
A. Check Points When a Bar Code Cannot Be Read
B. Single Scan and Raster Scan
C. Skew, Pitch and Tilt
D. Concept of Maximum Allowable Line Speed

Bar Code Reader Technical Guide

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Do you know how laser and CCD readers differ?


Here is a part of description for laser type.
1.  Stationary-type Laser Bar Code Reader
This section describes the reading principle of the stationary-type laser bar code reader and its correct usage based on the structure.

Reading principle

1 Laser beams emitted from the laser diode hit the polygon mirror and scan a bar code.
2 The light-receiving element (photodiode) receives the light of diffuse reflection from the bar code.
3 The diffuse reflection looks like an analog waveform as illustrated.
4 The bar code reader converts the waveform from analog to digital (A/D conversion).
5 The bar code reader identifies the narrow/wide bars and narrow/wide spaces using digital signals.
6 The bar code reader converts the signal combination of the bars and spaces into data according to the bar code rules (decoding). It outputs the decoded data to the external unit through RS-232C or an equivalent interface.



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