Liquid Spacer Alignment for Optical Wafer Manufacturing

The patent introduces liquid spacers as an intermediary material between substrates and optical elements. These liquid spacers are deposited in a controlled manner and cured to form precise spacers that mediate the distance between substrates, eliminating the need for mechanical alignment of solid spacers and thereby improving distance accuracy while reducing alignment tolerance requirements.

The patent changes the physical state of the spacer material from solid to liquid, and then to cured solid. By depositing spacers in liquid form, the system gains freedom from mechanical alignment constraints, and the liquid can be precisely controlled in volume and placement. After curing, the liquid transforms into a stable solid spacer that maintains precise dimensions, thereby improving manufacturing precision.

The patent replaces mechanical alignment systems with a liquid deposition and curing system. Instead of mechanically positioning and securing solid spacers requiring precise alignment, the system uses liquid spacers that can be deposited with less stringent alignment requirements and then cured in place, simplifying the manufacturing process while maintaining high alignment accuracy.

The patent utilizes phase transition of the spacer material from liquid to solid through curing. The liquid phase allows for easier deposition and adaptation to substrate variations, while the solid phase provides structural stability. This phase transition enables the manufacturing process to achieve high precision without the complexity of mechanical alignment procedures.