How to Design Button FPC Board in Electronic Products

How to design button flexible circuit boards in electronic products? For example, situations such as too narrow and unreasonable distribution of positioning holes. If FPC button pans are made according to their requirements, it will cause problems such as poor positioning, eccentricity, and poor use of buttons. How to choose the type of pan slices, and how to deal with the eccentricity of pan slices and buttons? Here, our company will provide a detailed introduction for customers and friends to use and understand. Reasons and prevention measures for eccentricity of DOME and buttons.



Design Issues of FPC Flexible Circuit Board



There is a problem with the alignment of the column and PCB board on KEYPAD, resulting in a large deviation. There is a problem and the design needs to be changed.



Requirements for the gold plated circular ring on the 2-button FPC board: the size of the 4 DOME: the outer ring is required to be 4.8, and the inner ring is required to be 1.8 solid circles The size of 5DOME: The outer ring is required to be 5.8 and the inner ring is required to be 2 solid circles. The solid circle size of the outer and inner rings is small, and the contact area between the spring and PCB gold dots is small, which can cause poor contact. If the size of the inner ring solid circle is too large, it will cause excessive sensitivity and there may also be a common phenomenon.



There are issues with the pasting of DomeSheet and FPC. It is recommended to use a tool for pasting, and try to design the positioning hole at the diagonal position of the product to ensure the pasting position. The flexible circuit board should carefully proofread the drawings and make timely changes if there are any problems; Strictly control the process and strengthen self inspection and mutual inspection. Strengthen employee training to improve one's technical quality.