Views: 0 Author: Site Editor Publish Time: 2024-05-11 Origin: Site
Light Source and Focusing
The PCB exposure machine initially emits light from a light source, such as an ultraviolet light source. This light is then focused precisely onto the PCB (Printed Circuit Board) through the use of mirrors and lenses. This process ensures that the light is projected onto the photosensitive material on the PCB with the correct intensity and direction.
PCB Positioning
Before exposure, the PCB is precisely placed into the exposure position of the exposure machine through a positioning system and a worktable. This often involves automatic recognition and positioning of the PCB to ensure the accuracy and consistency of the exposed pattern.
Exposure Process
Once the PCB is correctly positioned, the pcb exposure machine begins the exposure process. During this process, a shutter controls the passage or blockage of light, thus exposing the circuit pattern onto the photosensitive material. The photosensitive material in the exposed area undergoes a chemical reaction under the illumination of light, forming a layer of photoresist film, known as the exposed layer. The photosensitive material in the unexposed area remains unchanged.
Development and Etching
After exposure, the PCB undergoes a subsequent chemical or physical process to develop the photosensitive material. This process transfers the photoresist film from the exposed layer onto the PCB, forming the desired conductive traces and electronic component patterns. Then, through etching and other processes, the unwanted copper layers are removed, ultimately resulting in a complete PCB circuit board.
In summary, the PCB exposure machine accurately transfers the circuit pattern onto the PCB through steps such as light source focusing, PCB positioning, and exposure. This process requires high-precision mechanical control and optical technology to ensure the quality and performance of the PCB.
