Patent ID: 8885086

Claim:
A camera device, comprising: a lens module; and a birefringent sapphire lens coupled to said lens module to protect said lens module, said sapphire lens having a crystal structure and a crystal axis, wherein said crystal structure is a single-crystal structure and said crystal axis includes one selected from a group consisting of c-axis, a-axis, m-axis and r-axis; wherein said c-axis is c-axis (0001), said a-axis is one of the a-axis (1 2 10), a-axis (11 2 0), a-axis (2 11 0), a-axis ( 11 20), a-axis ( 2 110) and a-axis ( 1 2 1 0), said m-axis is one of the m-axis ( 1 010), m-axis ( 1 100), m-axis (01 1 0), m-axis (10 1 0), m-axis (1 1 00), m-axis (0 1 10), said r-axis is one of the r-axis (10 1 1), r-axis ( 1 01 1 ), r-axis (01 11 ), r-axis (0 1 11), r-axis (1 1 0 1 ) and r-axis ( 1 101).