Cara Kerja Pemindai Kode Batang Laser Genggam

Pemindai genggam laser adalah pemindai baris-tunggal yang menggunakan dioda laser sebagai sumber cahaya. Ini terutama memiliki dua jenis: jenis cermin putar dan jenis cermin ragu-ragu.

The representative brand of the rotating mirror type is ACAN 8500, which uses a high-speed motor to drive a prism group to rotate, so that the single-point laser emitted by the diode becomes a line. This laser line scans the bar code itself. The black bar code absorbs most of the laser light, and the white light reflects most of the laser light. At the same time, the reflected light passes through the optical lens in the "engine" and is reflected and focused on a phototransistor. Observe and scan in the time domain. Go to the black band of the barcode and output the low level of the photo-laser. When the white band is on, the photo-transistor is high. After several magnifications, the shape is a rectangular wave, which corresponds to the scanned barcode. The resulting waveform is then passed to the "decoder" section via the data line. The "decoder" is actually a single-chip microcomputer, which mainly depends on the interrupt and the single-chip computer counter to record the waveform jump time. The acquired sequence is digitally decoded during the next scan or retrace, and mainly depends on the time ratio of these counters to decode the corresponding In practical applications, there are many types of barcodes, and they need to encounter irregularities such as blister packaging folds, so the decoding part needs a certain degree of fault tolerance, but it cannot generate error codes. At present, the decoder microcontroller is generally divided into 8-bit and 32-bit. The advantage of 8-bit lies in the price and the speed of 32-bit. The laser bar code market is a mixed bag and has followed in the footsteps of ccd scanners. The price has repeatedly fallen and the cottage is rampant. However, there are several domestic manufacturers with strong capabilities. Consumers need to carefully consider what brand to use and choose the most suitable one.

Biaya pembuatan jenis cermin gemetar lebih rendah daripada jenis cermin putar, tetapi senjata laser dengan prinsip ini tidak mudah untuk meningkatkan kecepatan pemindaian, yang umumnya 33 kali per detik. Model individu, seperti OPTICON, dapat mencapai 100 kali per detik. Merek yang mewakili adalah Symbol, PSC dan OPTICON. Yang paling representatif adalah SYMBOL 2208.

Saat memilih pemindai laser untuk perusahaan komersial, sangat penting untuk memperhatikan kecepatan dan resolusi pemindaian, dan kedalaman bidang bukanlah faktor kunci. Karena ketika depth of field ditingkatkan, resolusinya akan sangat berkurang. Pemindai laser genggam yang sangat baik harus memiliki kecepatan pemindaian tinggi dan resolusi tinggi dalam kedalaman bidang yang tetap.