Optomechanical Instrument Register

Providing information and solutions to optomechanical professionals

Viewer, 3D, Stereoscopic

A Stereoscope 3-D Viewer has been de­signed and developed for television sets and computers. It can be viewed without headgear or special glasses. The Viewer uses a camera to track the viewer’s eyes, allow­ing the Viewer to change position and still maintain 3D imaging.

The Viewer consists of folded focusing op­tics, two liquid crystal display video pro­jectors mounted behind a partially silvered screen and a reflective screen. The left image and the right image fields of a stereoscopic image are projected and reflected off a pair of 45° retroreflective mirrors at the bottom of the cabinet. The silvered mirror suspended at 45° is in front of a 50-inch rear projection screen. This provides for the passage of 50 per­cent of the reflected light.

A small TV camera is positioned under the cabinet and tracks the viewers eyes to ensure correct image focus in both eyes. The tracking is updated 25 times per sec­ond. This information is used to adjust the position of the projected images automati­cally keeping the images aligned for 3D viewing.

The two images are spaced at 32 mm, half an eye spacing, to prevent image spillover. The eye tracking system allows both vertical and lateral viewer motion. The internal mirror op­tics is controlled by a logic servomechanism from information signals analyzed from the TV camera inputs. The projectors move horizon­tally for viewer lateral movement and the sil­vered mirrors tilt for viewer vertical movement.

Source: Laser Focus World, 1996
Reference: Xenotech , Perth West, Australia

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posted by JD52 @ 9:01 PM,


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