Pressure Sensor Waterproof Seal via Laser-Roughened Adhesive Interface

The patent applies a roughened surface treatment only to the specific adhesive application region on the case surface, rather than treating the entire surface. This localized roughening creates anchoring structures specifically where the adhesive contacts the case, improving water resistance at the boundary face without affecting other areas. The roughened annular surface portion provides enhanced adhesion and moisture barrier properties precisely where needed.

The roughened surface is formed on the case before the adhesive is applied. This preliminary surface preparation creates anchoring structures in advance that will interlock with the adhesive, preventing moisture intrusion from the outset. The roughening treatment is performed as a preparatory step that enhances the subsequent adhesive bonding and waterproofing effectiveness.

The patent replaces complex mechanical or chemical surface treatment methods with laser irradiation to create the roughened surface. The laser beam directly ablates or melts the material to form the desired rough texture, eliminating the need for mechanical grinding, blasting, or chemical etching processes. This substitution simplifies the overall manufacturing process while achieving the required surface morphology for enhanced waterproofing.

The patent controls the laser irradiation parameters (such as power, speed, pulse duration, and scanning pattern) to directly achieve the desired roughened surface morphology. By adjusting these parameters, the surface can be optimized for adhesive bonding and moisture resistance without requiring additional processing steps. The laser parameters are tuned to create the specific annular roughened pattern needed for effective waterproofing.