Patent ID: 8169721

Claim:
A lens assembly, comprising: a first lens including a first central round portion and a first peripheral stepped portion surrounding the first central round portion, the first peripheral stepped portion including a first radially extending portion surrounding the first central round portion and a first axially extending portion extending axially from the first radially extending portion, the first peripheral stepped portion comprising a downward-facing surface, a first supporting surface, and a first inclined surface interconnected therebetween, the downward-facing surface and the first supporting surface being substantially perpendicular to the principal axis of the first lens, the first inclined surface being inclined relative to the principal axis of the first central round portion; and a second lens including a second central round portion and a second peripheral stepped portion surrounding the second central round portion, the second peripheral stepped portion including a second radially extending portion surrounding the second round portion and a second axially extending portion surrounding the second radially extending portion, the second peripheral stepped portion including an upward-facing surface, a second inclined surface, a third surface, and a second supporting surface, the upward-facing surface and the second supporting surface being substantially perpendicular to the principal axis of the second lens, the second inclined surface being inclined relative to the principal axis of the second central round portion, and the third surface being inclined relative to or substantially parallel with the principal axis of the second central round portion, wherein, the second lens is engaged in the first lens in a manner that the first supporting surface of the first lens contacts the second supporting surface of the second lens, the downward-facing surface of the first lens faces toward the upward-facing surface of the second lens, the first inclined surface of the first lens contacts the second inclined surface of the second lens, and a gap is defined between the first inclined surface of the first lens and the third surface of the second lens.