There are many characters on the PCB board, so what are the very important functions in the later period? Common characters: "R" represents resistance, "C" represents capacitors, "RV" represents adjustable resistance, "L" represents inductance, "Q" represents a triode, "d" means It is a second -board tube. "X or Y" means crystal vibration, "U" means an integrated circuit, and so on.
Generally, other characters except the bit number represent some models, positive and negative poles, component models, and lamp boxes are the character box. In the process of design and manufacturing, you need to consider the sharpness of the character. The character design specifications and the component logo are clear, so that the manufacturing can produce clear characters. There are clear characters on the board to avoid error components during welding and subsequent maintenance.
Idential character design on the PCB board
01. Silk print number
The use of silk printing numbers is for the later component assembly, especially manual assembly elements. Generally, the assembly diagram of PCB is used for component material positioning. important.
02. Polaris symbols
In the background of electrical, the definition of polarity is the direction of current flowing in the circuit. PCB encapsulated character polar design is to pay attention to positive and negative electrodes.
03. One foot logo
Integrated circuit packaging generally has many pins, and the one -footed logo is the direction of distinguishing the element device. If the PCB packaging silk printing character does not have a foot logo, or the position of the one foot logo is wrong, it will cause the component to sticker the anti -product failure.
Character design defects on PCB board
01. The bit number is covered
The characters in the device contact identification may exist that the characters are blocked or covered by the component. It will cause difficulties in assembly welding, and it will also cause inconvenience to subsequent repairs.
02. The position number is too far from the pad
The bit number character is too far away from the component component, which will cause the corresponding component number when the patch is assembled, and there may be risk of welding stickers error components.
03. Pitzer word overlap
The contact or overlap of different silk printing characters will cause the silk printing to become blurred. When assembling components, it cannot distinguish the packaging board corresponding to the component. There will be risk of welding stickers.
Post time: Apr-17-2023
