Optical Element Resin Thickness Gradient for Thermal Stress

The patent applies local quality by creating a resin portion with non-uniform thickness distribution. The resin is made thicker at the center region and thinner at the outer peripheral portion, allowing different regions to handle thermal stress differently. This localized thickness variation reduces stress concentration at the periphery while maintaining optical performance at the center.

The patent changes the geometric parameter of the resin portion by controlling its thickness to vary continuously from the center to the periphery. This parameter change creates a gradient structure that modifies stress distribution patterns, preventing crack initiation and propagation in low temperature environments.

The patent implements local quality by making the resin portion thicker at the center and thinner at the periphery. This localized thickness control ensures that the resin has sufficient mass and strength where needed while reducing stress concentration in regions more prone to thermal stress, thereby preventing cracking.

The patent converts the potentially harmful uniform thickness design into a beneficial non-uniform thickness profile. By intentionally creating a thickness gradient, the design transforms what would be a simple structural parameter into a stress-management feature, where the varying thickness actively works to distribute and reduce thermal stress.