How to choose a commercial barcode scanner
1, the CCD scanner uses the principle of photoelectric coupling (CCD) to image the barcode printing pattern and then decode it. Its advantages are: no shaft, motor, long service life; cheap.
When choosing a CCD scanner, the two most important parameters are:
Depth of field: Since the imaging principle of CCD is similar to that of a camera, if the depth of field is to be increased, the lens should be enlarged accordingly, so that the CCD is too large and inconvenient to operate. Excellent CCDs should be readable without the need for a bar code, and they are medium in size and comfortable to operate.
Resolution: If you want to increase the CCD resolution, you must increase the unit element of the photosensitive element at the image. Low-cost CCD is generally 5 pixels (pixel), reading EAN, UPC and other commercial codes is enough, it will be difficult for other code systems to read. The mid-range CCD is more than 1024 pixels, and some even reach 2048pixe1, which can distinguish the bar code with the narrowest unit element of 0.1mm.
2, the laser handheld scanner is a single-line scanner that uses a laser diode as a light source. It mainly has two types of mirror and speculum.
The mirror type 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.
The cost of the speculum type is lower than that of the mirror type, but the laser gun of this principle is not easy to increase the scanning speed, generally 33 times/second.
When selecting a laser scanner for a commercial enterprise, the most important thing is to pay attention to the scanning speed and resolution, and the depth of field is not a key factor. Because when the depth of field is increased, the resolution will be greatly reduced. Excellent handheld laser scanner should have high scanning speed and high resolution in a fixed depth of field
3. The full-angle scanner is a bar code scanner that refracts laser light emitted by a laser diode or a plurality of scanning lines through an optical system. The main purpose is to reduce the labor of aligning barcodes when collecting cashier data, and pay attention to the selection when selecting. Scan line spot distribution:
1. There are multiple parallel lines in one direction
2. There are multiple scan lines passing at a certain point.
3. The probability of interpretation of each point tends to be consistent within a certain spatial range.
A full-angle scanner that meets the above three points must be the preferred barcode scanner application for merchants.