Patent ID: 6580555
Filing Date: 2003-06-17
Classification: G02B

Abstract:
An eyepiece for a viewing device with adjustable eye relief, the eyepiece comprising:a diopter ring to be affixed to the view device so that the diopter ring is stationary with respect to a lens in the viewing device; a sleeve slideably coupled with the diopter ring, the sleeve being axially adjustable relative to the diopter ring so that the eye relief is adjustable; and a cam system associated with the diopter ring and the sleeve that enables the sleeve to be situated in at least two axial positions, each of the at least two axial positions allowing viewing through the eyepiece, wherein the cam system is capable of preventing axial movement of the sleeve toward the diopter ring at each of the at least two axial positions in the presence of an axial force applied to the sleeve toward the diopter ring.