Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2005-01-25
2005-01-25
Ben, Loha (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S785000, C359S645000, C359S716000, C359S709000, C359S802000, C359S663000
Reexamination Certificate
active
06847494
ABSTRACT:
An optical magnifier is provided. One general form of one example embodiment includes two lens elements, at least two aspheric surfaces, and at least one diffractive surface. Another general form of another example embodiment includes three lens elements, and at least three aspheric surfaces. At least two of the aspheric surfaces can be simple conics. The optical magnifier, suitable for use in an electronic display system, has an apparent field of view of at least +/−10 degrees; a magnification of at least 15×; a back focal length of at least 5 mm; and an eye relief greater than the effective focal length of the optical magnifier. The lens elements can be made from plastic.
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Ben Loha
Zimmerli William R.
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