Resin Structural Body With Gradual Thickness Transitions

The plate thickness changing portions are segmented into rectilinear sections that change thickness in only one direction at a time, rather than extending in multiple directions simultaneously. This segmentation prevents the intersection points where molding defects occur, while still achieving connectivity between panel portions of different thicknesses through a series of sequential thickness transitions.

The problematic intersection point portions where multiple gradually changing portions would cross are extracted or removed from the design. Instead of allowing intersection points to form, the gradually changing portions are configured to extend rectilinearly in non-intersecting paths, thereby eliminating the source of quality defects while preserving the connectivity function.

The opening portions are preliminarily planned and positioned at the locations where gradually changing portions would intersect, before the actual molding process. By pre-determining these opening locations in the design stage and configuring the gradually changing portions to align with them, the manufacturing process incorporates these openings naturally without requiring complex additional steps, thus maintaining ease of manufacture while eliminating intersection point defects.