Chromatic-difference-free wide-angle camera for head-mounted device, and head-mounted device

Abstract

A chromatic-difference-free wide-angle camera for a head-mounted device, comprising a casing, a biconvex plus lens (), and a biconcave minus lens (). The biconvex plus lens () and the biconcave minus lens () are arranged in parallel in the casing and the biconcave minus lens () is closer to an object space. The biconvex plus lens () comprises a first surface () that is convex toward the object space, and a second surface () that has a flat edge and a center position that is convex toward an image space. The biconcave minus lens () comprises a third surface () that is concave toward the object space, and a fourth surface () that has a flat edge and a center position that is concave toward the image space. The biconcave minus lens () can move along an axis of the casing to adjust a distance to the biconvex plus lens (), and compensate for a defocus in a zooming manner. The head-mounted device is suitable for being used with naked eyes by persons having −500 degree nearsightedness to 500 degree farsightedness. In use, a user can adjust the focal length according to his degree of nearsightedness or farsightedness to achieve a clear imaging without changing the conjugated distance between the human eyes and the screen.