Counteracting Second Casing Vibration in Mobile Terminals

The patent applies preliminary anti-action by introducing an additional vibrator that generates counter-vibration in advance to offset the harmful vibration transmitted to the second casing. The additional vibrator is driven by a signal processed through a transfer function to produce vibration that is 180 degrees out of phase with the unwanted vibration, thereby canceling it out before it affects the user experience.

The patent converts the harmful vibration transmitted to the second casing into a beneficial effect by using the same vibration source to drive an additional vibrator that generates counter-vibration. The unwanted vibration energy is transformed into a useful counteracting force that eliminates the harmful effect, turning the problem into a solution.

The patent applies universality by making the additional vibrator share the same input signal source as the exciter. Both vibrators are driven by signals derived from the same input signal X(S), allowing them to coordinate their vibration patterns without requiring separate control systems. This multi-functional approach reduces control complexity while achieving vibration cancellation.

The patent implements feedback through the signal processing unit that calculates and adjusts the transfer function H(S) based on the measured vibration responses Y1(S) and Y2(S). The system uses feedback from the vibration measurements to determine the appropriate counter-vibration signal, creating a closed-loop control system that automatically adapts to minimize unwanted vibration.