Lens assembling structure

A lens assembling structure including a lens system and a holding member for holding each lens element of said lens system, said structure comprising:

• a lens element in said lens system including a curved lens function surface which allows light to pass therethrough, and a curved abutting surface disposed at the periphery of said lens function surface and adapted to abut against said holding member, said abutting surface being designed such that an inclination center of said lens element is located on an optical axis of said lens system and at a point where aberration deterioration due to inclination and decentering of said lens element is reduced, and said abutting surface having a different radius of curvature from that of said lens function surface.

A lens assembling structure comprising a first positive lens, a second negative lens, and a third positive lens arrange sequentially from a subject to form a whole lens system, and a holding member for holding each lens element,

• said second lens including a curved lens function surface which allows light to pass therethrough, and a curved abutting surface disposed at the periphery of said lens function surface and adapted to abut against said holding member, said abutting surface being designed such that an inclination center of said lens element is located on an optical axis of said whole lens system and at a point where aberration deterioration due to inclination and decentering of said second lens is reduced, and said abutting surface having a different radius of curvature from that of said lens function surface.