1. Light Source Emission
The PDA's scanning head (laser or imaging type) emits light of a specific wavelength (such as red light, laser, or multi-color LED light source) to illuminate the barcode.
Laser Scanning Head: Reads the difference in reflection between the black and white stripes of the barcode by rapidly moving a laser beam laterally.
CMOS Imaging Scanning Head: Captures the barcode image using a camera and decodes it using algorithms.
2. Reflected Signal Reception
The black stripes of the barcode absorb light, while the white stripes reflect light. The scanning head receives the reflected light signal and converts it into an electrical signal.
3. Decoding and Transmission
The PDA's built-in decoding chip or software algorithm converts the electrical signal into digital/character information (such as product code, batch number, etc.).
The decoded data is transmitted to the PDA system or backend database via an interface (Bluetooth, Wi-Fi, USB, etc.).
The process of scanning barcodes on a handheld PDA seems simple, but it actually involves the efficient collaboration of hardware technology and software logic. When the user triggers the scanning function, the device's underlying image sensor is quickly activated, capturing the optical signal of the barcode through a high-precision lens. Handheld PDAs typically employ CMOS imaging technology, coupled with an adaptive focusing system, enabling image acquisition within 0.3 seconds, even in environments with a 30-degree tilt or low light conditions.
Handheld PDAs can efficiently collect barcode data and are widely used in express delivery, retail, manufacturing, and medical fields.
