Patent ID: 6529339
Filing Date: 2003-03-04
Classification: G02B

Abstract:
A combination lens comprising:a first lens which includes: a first lens effective diameter area having a first optical axis; a first peripheral area formed integral with said first lens effective diameter area and located at a periphery of said first lens effective diameter area; and a first circular marker area located in said first peripheral area and centered on the first optical axis of said first lens effective diameter area and including a circular groove centered on the first optical axis of said first lens effective diameter area; and a second lens which includes: a second lens effective diameter area having a second optical axis; a second peripheral area formed integral with said second lens effective diameter area and located at a periphery of said second lens effective diameter area; and a second circular marker area located in said second peripheral area and centered on the second optical axis of said second lens effective diameter area, and including at least three projections arranged on a circle centered on the second optical axis of said second lens effective diameter area in contact with the circular groove of said first lens.