Patent ID: 6825995
Filing Date: 2004-11-30
Classification: G02B

Abstract:
An optical system comprising first and second optical devices,the first optical device having a first optical portion made of a first optical material and having a first concavity and a second optical portion comprising a second optical material having a refractive index different from that of the first optical material and inserted into the first concavity, and the first concavity having a substantially rotationally symmetric shape with respect to an optical axis, the second optical device having a third optical portion made of a third optical material and having a second concavity and a fourth optical portion comprising a fourth optical material having a refractive index different from that of the third optical material and inserted into, the second concavity, and the second concavity having a substantially rotationally symmetric shape with respect to the optical axis, the first and second optical devices being bonded so that symmetry axes of the first and second concavities meet the optical axis, wherein; the first optical portion has a first flat surface located at the area around the circumferential edge of the concavity and a second flat surface substantially parallel with respect to the first flat surface, the outer surface of the second optical portion inserted in the first concavity and the first flat surface are located in an substantially identical plane, the third optical portion has a third flat surface located at the area around the circumferential edge of the second concavity and a fourth flat surface substantially parallel with respect to the third flat surface, and one of the first and second flat surfaces is bonded with the third flat surface.