CEMENTED DOUBLET, LENS DEVICE USING THE SAME AND MANUFACTURING METHOD FOR CEMENTED DOUBLET

摘要

PROBLEM TO BE SOLVED: To provide a cemented doublet having the high degree of freedom in design for compensating aberration and having small eccentricity, and a manufacturing method for the cemented doublet, and further to provide a lens device having high resolution. SOLUTION: This cemented doublet is constituted of a 1st lens element 11 and a 2nd lens element 12. In such a case, a lens element having a concave surface 17 including an effective area on an opposed surface (back surface 14) opposed to the 2nd lens element 12 and formed to come into contact with the 2nd lens element 12 at an edge 19 being the outer edge of the concave surface 17 is used as the 1st lens element 11. The 1st lens element 11 is stuck to the 2nd lens element 12 on the outside of the concave surface 17.