How to Design the Key FPC Board in Electronic Products

How to design the key flexible circuit board in electronic products? Such as too narrow, unreasonable distribution of positioning holes, etc. If the FPC key pan chips are made according to the requirements, it will cause problems such as poor positioning of the pan chips, eccentricity, and poor use of the keys. How to select the type of pot chips, and how to deal with the eccentric pot chips and buttons? Here, we will give a detailed introduction to it for customers and friends to use and understand. The causes and prevention countermeasures of the eccentric DOME and keys.

Design of FPC Flexible Circuit Board

1. The alignment of the column on KEYPAD with the PCB board has a large deviation. If there is a problem, you need to change the design.

Requirements for gold-plated ring on the 2 key FPC board: the size of the Φ 4 DOME: the outer ring is required to be Φ 4.8, and the inner ring is required to be Φ 1.8 solid circle; The dimension of ｜ 5DOME: outer ring ｜ 5.8 and inner ring ｜ 2 solid circle are required. The size of the solid circle of the outer ring and inner ring is small, and the contact area between the spring piece and the PCB gold dot is small, which will cause poor contact. If the size of the inner ring solid circle is too large, it will be too sensitive, and there will be a common phenomenon.

There is a problem in pasting DomeSheet and FPC. It is recommended to use a tool to paste them. Try to make the positioning hole design at the opposite corner of the product to ensure the pasting position. The flexible circuit board shall carefully check the drawings, and timely change if there is any problem; Strictly control the process and strengthen self inspection and mutual inspection. Strengthen staff training to improve their technical quality.