Patent ID: 7920455
Filing Date: 2011-04-05
Classification: G11B

Abstract:
1. A complex optical element comprising: a first optical portion; and a second optical portion, wherein: the first and second optical portions are made of materials different from each other, the first optical portion includes an optical functional face to which the second optical portion is bonded, the optical functional face in the first optical portion includes a first diffraction face formed at a central part of a region of a bonded surface between the first optical portion and the second optical portion, and a first smooth face formed adjacent to the first diffraction face, the second optical portion includes an optical functional face opposite to the bonded surface between the first and second optical portions, the optical functional face in the second optical portion includes a second smooth face formed at a central part thereof, and a second diffraction face formed adjacent to the second smooth face, and the first diffraction face and the second diffraction face do not overlap in a direction of an optical axis.