Overview of barcode scanner 2021

Overview of barcode scanner 2021

When contacting the bar code scanning gun, we often encounter many difficult technical terms: such as optical resolution (optical resolution), maximum resolution (maximum resolution), color resolution (color depth), scanning mode, interface mode (connection interface), etc. Now let's introduce the basic knowledge of these bar code scanning guns, so that we can know more about bar code scanning guns, which can also be used as a reference when we buy bar code scanning guns. In fact, bar code scanner, bar code scanning gun and bar code reader are the same thing, but they are used to different names. Type of barcode scanner:

There are many types of bar code scanners, including the following:

Handheld barcode scanner. The handheld bar code scanner is a product formed by the technology launched in 1987. Its shape is very similar to the bar code scanner used by the supermarket cashier in his hand. The vast majority of portable bar code scanners adopt CIS technology, with an optical resolution of 200 DPI. There are many types of black-and-white, gray and color, of which the color type is generally 18 bit color. Some high-end products also use CCD as photosensitive device, which can realize bit true color and good scanning effect.

Small roller bar code scanner. This is an intermediate product of handheld bar code scanner and desktop bar code scanner (a new product has appeared in recent years because it is a built-in power supply and small volume, which is called notebook bar code scanner). Most of this product adopts CIS technology, with an optical resolution of 300dpi, color and gray, and the color model is generally 24 bit color. Some and a few small roller bar code scanners adopt CCD technology, and the scanning effect is obviously better than that of CIS technology products. However, due to structural constraints, the volume is generally significantly larger than that of CIS technology products. The small roller type design is to fix the lens of the bar code scanner, and move the object to be scanned to scan through the lens. During operation, like the printer, the object to be scanned must pass through the machine and then be sent out. Therefore, the scanned object cannot be too thick. The biggest advantage of this bar code scanner is that it is very small, but it has many limitations in use. For example, it can only scan thin paper, and the range can not exceed the size of the bar code scanner.

Platform bar code scanner. It is also called flat bar code scanner and desktop bar code scanner. At present, most bar code scanners in the market belong to flat bar code scanner, which is the mainstream now. The optical resolution of this kind of bar code scanner is between 300dpi and 8000dpi, the number of color bits is from 24 to 48, and the scanning format is generally A4 or A3. The advantage of the flat panel type is that, like using a copier, as long as the upper cover of the bar code scanner is opened, no matter books, newspapers, magazines and photo negatives can be put on for scanning, which is quite convenient, and the scanning effect is also the best of all common types of bar code scanners.

Others include large noodle code scanner, pen bar code scanner, negative bar code scanner for large format scanning (note that it is not a flat bar code scanner with transparent scanning, the effect is much better, and the price is of course expensive), physical bar code scanner (it is not a flat bar code scanner with physical scanning ability, which is a bit similar to digital camera), There are also many roller bar code scanners mainly used in the field of printing and typesetting.