Variable focal length lens

摘要

A variable focal length lens ( 12 ) includes a central transparent elastic portion ( 120 ) having a first wall ( 1200 ) and a second wall ( 1202 ) intersecting an optical axis and a peripheral portion ( 122 ) surrounding the body. The first wall and the second wall joined with the periphery form a container ( 124 ). The container is filled with magnetic fluid ( 126 ).