Folded telephoto camera lens system

摘要

A folded telephoto lens system may include multiple lenses with refractive power and a light path folding element. Light entering the camera through lens(es) on a first path is refracted to the folding element, which changes direction of the light on to a second path with lens(es) that refract the light to form an image plane at a photosensor. At least one of the object side and image side surfaces of at least one of the lens elements may be aspheric. Total track length (TTL) of the lens system may be 14.0 mm or less. The lens system may be configured so that the telephoto ration (TTL/f) is less than or equal to 1.0. Materials, radii of curvature, shapes, sizes, spacing, and aspheric coefficients of the optical elements may be selected to achieve quality optical performance and high image resolution in a small form factor camera.

主权项

1. A camera, comprising:
a photosensor configured to capture light projected onto a surface of the photosensor; and a folded telephoto lens system comprising a plurality of optical elements arranged along a first optical axis and a second optical axis of the camera and configured to:
refract light from an object field located in front of the camera along the first optical axis;redirect the light on to the second optical axis; andrefract the light on the second optical axis to form an image of a scene at an image plane at or near the surface of the photosensor; wherein the plurality of optical elements includes, in order along the first and second optical axes from an object side of the camera to an image side of the camera:
one or more lens elements on the first optical axis;a light path folding element configured to redirect the light from the first optical axis on to the second optical axis; andone or more lens elements on the second optical axis; wherein the telephoto lens system further includes an aperture stop located between a first lens element on the first optical axis and a reflecting surface of the light path folding element.