Bar code scanner and its bar cod scanning method

Abstract

The invention relates to a lamp house and light sensor which are arranged with a single circuit board, and the code reading speed is quick, the identification performance is high, strong resolution and high precision, it has a bar code scanner capable of quickly long distance reading code. The bar code scanner includes a printed circuit board, there is a semiconductor laser diode power source on the circuit board, a scanning light reflection guide device, a light swing reflector and a light sensor, pendulum driving coil and a set of signal control and process circuit, the light from the laser diode is guided to the pendulum reflecting mirror through the small mirror on the light collector and forms parallel scanning beam with time difference, and it scans the object bar code on the front end of the circuit board and forms light rebounding signal, and the signal is concentrated onto the light sensor through the collector in order to be checked, then a demodulating amplification filter circuit processes the signal acquired by the light sensor into correspondent bar code signal.

Description

technical field [0001] The invention relates to a barcode scanner and a barcode scanning method thereof. Background technique [0002] Barcode scanning devices are now commonly used in supermarkets or stores to efficiently process goods whose item numbers or prices are coded with barcodes. The operating principles of barcode scanning devices can be seen in many previous technologies, such as: Publication No. 179959 Taiwan Patent, or US Patent No. 5,932,860, however, the internal design of these prior art barcode scanning devices is relatively very complicated. [0003] Please refer to FIG. 1 , which is an exploded view of a conventional pen-shaped barcode scanning device 10 . The conventional barcode scanning device 10 includes a housing 12 and a circuit board 14 disposed in the housing 12 , the circuit board includes a light sensor 28 and a control circuit (not shown). The casing 12 further includes a pupil 16 , a lens 18 , a light source 22 , and a positioning component ...

AI Technical Summary

Problems solved by technology

[0005] Although the design of the barcode scanning device 10 seems very straightforward, the process of its output is very complicated when actually manufacturing these devices, thus making its price high, especially because the four LED light sources 22 must be installed near the scanning The volume of the reading head 24 and the reading lens 26 must be very small, so its specifications are special and the price is also high. At the same time, since the four LED light sources 22 are close to the front end to scan the reading head 24, its power supply must be provided by the rear end. The circuit board 14 is additionally connected to the power cord 21 for supply, and the power cord 21 must also be welded during assembly.

Lenses 18 and 26 must be manually assembled due to their small size, which further complicates the assembly process.

In addition, the barcode scanning device is still unable to achieve fast, long-distance code reading and decoding with high recognition capability.

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