Patent ID: 6992842

Claim:
An optical device, comprising: a convex lens formed with a convex curved face and a flat surface; and a first optical portion closely contacting a portion of the convex curved face of the convex lens, wherein; the first optical portion has first and second faces facing each other, a concave curved face closely contacting the portion of the convex curved face being formed in the first face, and a hole communicating with the second face being formed from a deep side of the concave curved face, and part of the convex curved face of the convex lens is exposed in the hole of the first optical portion, wherein an area around the concave curved face in the first face of the first optical portion is flat or substantially flat and located in an identical plane of said flat surface of the convex lens, and wherein the convex curved face of the convex lens faces away from the flat surface of the convex lens.