Virtual image display device
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United States of America Patent
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Aug 25, 1998
Issued Date -
N/A
app pub date -
Dec 8, 1994
filing date -
Jul 3, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A head-coupled display device for use in presenting electronically generated visual images to a viewer. The device includes a headpiece worn by a viewer, and an image display screen mounted in the headpiece for presenting electronically generated images. A fresnel lens is positioned adjacent the screen for focusing images from the screen at a selected position for viewing as a virtual image. The lens has a set of concentric converging rings whose surface curvatures act to minimize rectilinear distortion of the virtual images perceived by the viewer over the entire field of view of the image.
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