Tue Jun 14 15:08:52 CST 2022
A common flat bar code scanner is generally composed of a light source, an optical lens, a scanning module, an analog-digital conversion circuit, and a plastic shell. It uses photoelectric elements to convert the detected light signal into an electrical signal, and then converts the electrical signal into a digital signal through an analog-digital converter and transmits it to the computer for processing. When scanning an image, the light source shines on the image and the reflected light passes through the lens to converge on the scanning module. The scanning module converts the light signal into an analog digital signal (ie voltage, which is related to the intensity of the received light). Related), and at the same time point out the degree of darkness of the image number. At this time, the analog-digital conversion circuit converts the analog voltage into a digital signal and transmits it to the computer. Colors are quantized with 8, 10, and 12 bits of the RGB three colors, and the signal is processed into the image output of the above-mentioned number of bits. If there is a higher number of quantization bits, it means that the image can have richer levels and depth, but the color range has exceeded the recognition ability of the human eye, so for us, a higher number of barcode scanning is within the distinguishable range The effect of the scanner is that the colors are smoothly connected, and more details of the picture can be seen.
There are many types of barcode scanners. The new scanner products already have Bluetooth function. The barcode scanner can be connected to a Bluetooth-enabled mobile phone or PDA, making data storage and transmission more convenient.
The Bluetooth barcode scanner combines a PDA or mobile phone with a barcode scanner, which not only improves the convenience and efficiency of use, but also saves costs and makes it more widely used.
Bluetooth is a radio technology that supports short-distance communication (generally within 10m) of devices. It can exchange information wirelessly among many devices including mobile phones, PDAs, wireless headsets, notebook computers, and related peripherals. The use of "Bluetooth" technology can effectively simplify the communication between mobile communication terminal devices, and also successfully simplify the communication between the device and the Internet, so that data transmission becomes faster and more efficient, and broadens the way for wireless communication. Bluetooth uses a distributed network structure, fast frequency hopping and short packet technology, supports point-to-point and point-to-multipoint communication, and works in the global 2.4GHz ISM (ie, industrial, scientific, and medical) frequency band. Its data rate is 1Mbps. The time division duplex transmission scheme is adopted to realize full duplex transmission.
Therefore, bar code scanners incorporating Bluetooth technology have greater portability and compactness.