Patent ID: 7319561

Claim:
A stereoimage formation apparatus comprising: at least two lens array plates, each lens array plate including a plurality of microlenses, each having an optical axis and a peak, wherein: the optical axes of the microlenses are parallel to one another; the optical axes of the microlenses in one of the at least two lens array plates are aligned with the optical axes of the microlenses in the other one of the at least two lens array plates; the peaks of the microlenses in one of the at least two lens array plates are in contact with or located proximal to the peaks of the microlenses in the other one of the at least two lens array plates; and the microlenses of each lens array plate each have a predetermined spherical aberration that is greater than a predetermined minimum spherical aberration by a controlled amount thereby allowing a working distance of the stereoimage formation apparatus to be changed while still providing an image clear enough to be viewed without blurriness.