Optical arrangements for small size wide angle auto focus imaging lens for high resolution sensors

摘要

An optical assembly 100 has a first lens holder 102 with a collar 108 having an internal flange 110 forming a spring seat 112. A first lens group 103 is positioned within the first lens holder along an optical axis 104. A second lens holder 105 has a collar defining a chamber 128 and is coupled to the collar of the first lens holder. A biasing element 106 and variable focus optical element 107 are positioned within the chamber of the second lens holder. The variable focus optical element is positioned along the optical axis to receive light from the first lens group. The biasing element is positioned between the spring seat and the variable focus optical element and applies a threshold force to the variable focus optical element. The collar of the first lens holder may have threads 129 that engage threads 130 of the collar of the second lens holder. The threads of the first lens holder may by internal and the threads of the second lens holder may be external. Another optical assembly is different to this optical assembly in that the first/second lens holder have internal/external threads that engage one another without collars that couple together.