Patent ID: 7633683

Claim:
An HMD device comprising: first and second imaging optical systems for the left and right eyes of a user wearing said device; a support frame having a first side facing away from the user and a second side facing toward the user and defining first and second windows corresponding to respective ones of said first and second imaging optical systems for the left and right eyes of said user, respectively; each one of said imaging optical systems being adapted to so image an image formed in an object plane to permit said user to observe said image in an image plane with the eye corresponding thereto; each one of said imaging optical systems including an optical assembly linearly movably guided along said support frame on said first side thereof and laterally of the window in said support frame corresponding to the optical system; each of said optical assemblies including an optical element defining an optical axis and said optical element being held in said optical assembly so as to prevent a rotation of said optical element about said optical axis when said optical assembly is moved linearly along said support frame in the direction of said optical axis; each one of said optical assemblies including an image transducer fixedly mounted thereon upstream of the optical element; each of said optical systems further including a deflecting element disposed on said first side of said support frame downstream of said optical element to deflect said optical axis through the window corresponding to the optical system and toward the corresponding eye of the user; each one of said imaging optical systems further including a drive unit for driving said optical assembly so as to cause said optical assembly to be displaced on said support frame along said optical axis; the drive units of said first and second imaging optical systems including respective adjusting wheels mounted on said second side of said support frame and disposed next to corresponding ones of said first and second windows as viewed from said user; each of said adjusting wheels and the optical assembly corresponding thereto conjointly defining a cam interface at said support frame; and, each of said drive units further including an essentially two-dimensional, flat cam mechanism at said cam interface for coupling the adjusting wheel to the optical assembly so as to translate an input rotational movement of the adjusting wheel into an output linear movement of the optical assembly and said optical element thereof along said first side of said support frame for compensating the ametropia of the corresponding eye of the user.