Head mounted display viewing optics with improved optical performance
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United States of America Patent
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Feb 19, 2002
Grant Date -
N/A
app pub date -
Jul 13, 2000
filing date -
Jul 16, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A lens design form is used for a viewing optical system or magnifier that includes a cemented doublet and a weak aspheric element, for example, made of acrylic, and having a diffractive kinoform surface superimposed on the surface profile of the aspheric element. The design significantly reduces both chromatic aberrations and minimizes most of the monochromatic aberrations of the optical system or magnifier. By allowing the lens design form to produce an image on a curved surface, optical performance is improved further over the prior art systems because this allows the elements in the system to control the image blurring aberrations rather than having to also control field curvature. The human eye can accommodate for the curved field, and thus the curved field does not reduce image quality, but instead allows image quality to be enhanced. The viewing optical system also can be used for image projection.
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