US Patent 10591736 Snap ring for attaching facial interface

A Head-Mounted-Display (HMD) has snap rings assembled onto the eyecup assembly. The HMD includes a front body with an outer case and an eyecup assembly. At least a portion of the eyecup assembly is enclosed in the outer case at a rear portion of the front body. The HMD includes a facial interface of a specific shape and dimension to interface with a user's face at the rear portion of the front body. The HMD includes at least one snap ring assembled onto the eyecup assembly with a front portion of the facial interface between the snap ring and the front body to secure the facial interface to the front body.