Image Sensor Package Bonding Wire Protection

The patent applies beforehand cushioning by introducing a dam element that protrudes into the molding compound to create a stress relief zone. This dam element absorbs and distributes mechanical stress before it can reach the bonding wire, preventing wire damage from occurring in the first place. The recess portion in the image sensor chip further enhances this cushioning effect by providing additional stress distribution.

The dam element serves as an intermediary structure between the bonding wire and the molding compound. Rather than allowing direct contact and stress transfer between the molding compound and the delicate bonding wire, the dam element mediates this interaction by protruding into the compound and creating a buffer zone that protects the wire from direct mechanical damage.

The patent segments the protective structure into distinct functional elements: a dam element that protrudes into the molding compound, a recess portion in the image sensor chip, and the bonding wire itself. This segmentation allows each component to perform its specific protective function while maintaining manufacturing feasibility. The dam element can be formed separately and then integrated with the chip and wire assembly.

The protective structure applies local quality by concentrating protection only where needed - the dam element protrudes specifically at the bonding wire location to provide localized stress relief, while the recess portion creates a localized stress distribution zone on the chip surface. This localized approach provides effective protection without requiring complete encapsulation of the entire assembly.