Three scanning methods of barcode scanner and their advantages

There are three general barcode scanning methods: CCD barcode scanner, laser handheld scanner and full-angle laser scanner. The CCD barcode scanner uses the principle of photoelectric coupling (CCD) to image the barcode printed pattern and then decode it.

Advantages: no shaft, motor, long life; cheap.

Selection: When selecting a CCD barcode scanner, the two most important parameters are: Depth of Field

Since the imaging principle of CCD is similar to that of camera, if you want to increase the depth of field, you must increase the lens accordingly, so that the CCD is too large and inconvenient to operate. Excellent CCD should be able to be read without sticking to the bar code, and it is moderate 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 imaging location. Low{{0}}cost CCDs are usually 5 pixels. It is enough to read commercial codes such as EAN and UPC. It will be difficult to read other codes. Mid-range CCDs are mostly 1024pixels, and some even reach 2048pixe1, which can distinguish the barcode with the narrowest unit element of 0.1mm.

Erbium laser handheld scanners are single-line scanners that use laser diodes as the light source. There are two types of rotary scanners and dithered mirrors.

When choosing a laser barcode 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 the key factor. Because when the depth of field is increased, the resolution will be greatly reduced. An excellent handheld laser scanner should have a high scanning speed and high resolution within a fixed depth of field.

The full-angle barcode scanner is a barcode scanner that refracts the laser light emitted by a laser diode or multiple scanning lines through an optical system. The main purpose is to reduce the labor of registering barcodes when the barcode is entered by the payee. Line piebald distribution:

1, There are multiple parallel lines in one direction;

2, There are multiple scanning lines passing at a certain point;

3. The probability of interpretation of each point within a certain spatial range tends to be consistent.