Patent ID: 6972912

Claim:
An optical system comprising: a first optical device; and a second optical device, wherein the first optical device includes a first convex lens having a convex curved face and a first optical portion, wherein the first optical portion includes a first face, a second face, a first concave curved face, and a first hole, wherein the first face is parallel to the second face, the first face includes the first concave curved face, the first hole connects the second face to the first face through a portion of the first concave curved face, wherein a portion of the convex curved face of the first convex lens is exposed in the first hole of the first optical portion, wherein the second optical device includes a second convex lens having a convex curved face and a second optical portion, wherein the second optical portion includes a third face, a fourth face, and a second concave curved face, wherein the third face includes the second concave curved face, the second concave curved face contacts the convex curved face of the second convex lens, and the first and second optical devices are bonded so that the optical axes of the first and second convex lenses coincide or substantially coincide, and wherein the first convex lens has a rotationally symmetric or substantially rotationally symmetric shape surrounded by a flat surface, and the convex curved face of the first convex lens facing away from this flat surface, and the optical axis of the first convex lens or the extension thereof passes through the first hole of the first optical portion.