Patent ID: 9091843
Filing Date: 2015-07-28
Classification: G02B,H04N

Abstract:
1. An optical assembly for a point action camera having a wide field of view, comprising: multiple lens elements, including an aspheric surface, configured to provide a field of view in excess of 150 degrees that comprises a ratio of “total track length” to “effective focal length” that is less than 8, wherein total track length (hereinafter “TTL”) is defined as total distance from a first surface of a first lens of the optical assembly to an image plane, and effective focal length (hereinafter “EFL”) is defined as optical focal length of the optical assembly; and wherein the optical assembly comprises from object end to image end a first optical group and a second optical group; and wherein the first optical group is configured to collect light at said wide field of view and said second optical group is configured to compensate for astigmatism error; and wherein said second optical group is further configured to compensate for distortion error; and wherein said second optical group comprises multiple lens elements including an ultimate or penultimate lens element that is configured with an aspheric departure to compensate for said astigmatism error; and wherein said optical assembly comprises seven lens elements.