Patent ID: 9223118
Filing Date: 2015-12-29
Classification: G02B,H04N

Abstract:
1. A camera, comprising: a photosensor configured to capture light projected onto a surface of the photosensor; and a telephoto lens system configured to refract light from an object field located in front of the camera to form an image of a scene at an image plane at or near the surface of the photosensor, wherein the lens system comprises a plurality of refractive lens elements arranged along an optical axis of the camera, wherein at least one surface of at least one of the plurality of lens elements is aspheric, wherein the plurality of lens elements include at least a first lens element, a second lens element, a third lens element, and a fourth lens element, and wherein the fourth lens element from the object side of the camera has a concave image side surface; and wherein the lens system has effective focal length f, wherein total track length (TTL) of the lens system is 6.0 millimeters or less, and wherein telephoto ratio (TTL/f) of the lens system is within a range of 0.74 to 1.0.