Multilayer Photodiode Detection Structure for Stable Lens Shapes

The patent applies local quality by creating a gradual thickness transition only in the peripheral regions of the light-transmitting resin layer, while maintaining uniform thickness in the central detection region. This localized modification allows the resin layer to smoothly connect with adjacent layers at the edges, eliminating step formations that cause shape variations in optical elements, without affecting the precision of centrally formed lenses and pinholes.

The patent implements preliminary action by pre-forming the gradual thickness transition in the light-transmitting resin layer before forming the lens array and pinhole array. This preliminary structural preparation ensures that when subsequent optical elements are formed, the underlying resin layer already provides a smooth, variation-free foundation, preventing edge-related shape distortions from occurring during the optical element formation process.

The gradual thickness transition is applied only to specific peripheral regions of the light-transmitting resin layer, not to the entire structure. This localized approach maintains simple uniform thickness in the central detection region where optical elements are formed, while introducing the gradual transition only where needed at the edges to eliminate step formations, thus minimizing the increase in overall structural complexity.

The patent applies partial action by implementing the gradual thickness transition only in the peripheral regions rather than throughout the entire resin layer. This partial modification is sufficient to eliminate edge-related shape variations in optical elements without unnecessarily complicating the entire resin layer structure, achieving the desired precision improvement with minimal added complexity.