Vehicular Camera Shield Structure for EMI and Halation Control

The patent applies preliminary action by pre-forming welding ribs with specific geometries on both the lens unit flange portion and housing end surface before the welding process. The first welding rib protrudes from the flange portion in the radial direction, while the second welding rib protrudes from the housing end surface in the axial direction. These pre-formed ribs guide the welding process and prevent burr generation, thereby maintaining assembly accuracy while simplifying the manufacturing process.

The patent applies local quality by creating localized welding ribs at specific positions rather than welding the entire surfaces. The first welding rib is positioned on the flange portion's second surface, and the second welding rib is positioned on the housing end surface. This localized approach concentrates the welding action to precise areas, eliminating burrs while maintaining overall assembly precision.

The patent applies local quality by using light-absorbing materials specifically for the welding ribs and portions of the housing that could cause light halation. The first welding rib is made of a second resin with light-absorbing properties, and the housing includes light-absorbing portions at strategic locations. This allows the majority of the optical path to remain light-transmissive while preventing halation at critical interfaces.

The patent converts the potentially harmful effect of light absorption into a beneficial feature by using light-absorbing materials for the welding ribs and housing portions. Instead of allowing these structural elements to transmit light and cause halation, their light-absorbing property is utilized to block stray light and improve image quality, while the main optical components remain light-transmissive.

The patent applies merging by integrating the EMI shielding function into existing structural components rather than adding separate shielding elements. The housing is designed to provide EMI shielding while maintaining its primary structural and protective functions. The welding ribs and housing portions are configured to serve both mechanical assembly purposes and electromagnetic shielding purposes, thereby providing EMI protection without increasing device complexity.

The patent applies universality by designing the housing and welding ribs to perform multiple functions simultaneously. The housing provides structural support, protects internal components, and serves as an EMI shield. The welding ribs facilitate assembly while also contributing to EMI shielding and preventing light halation. This multi-functionality approach avoids adding dedicated EMI shielding components that would increase complexity.