Optical: systems and elements – Lens – With field curvature shaping
Patent
1997-09-12
1999-08-10
Epps, Georgia
Optical: systems and elements
Lens
With field curvature shaping
359708, G02B 300
Patent
active
059367768
ABSTRACT:
Variable focus, liquid coupled, front projection, lens systems (13) are provided for use with large screens (14), e.g., screens having a full diagonal of 1.5 meters and above. The lens systems (13) can be focused over a range of screen diagonals of at least 1.5:1 while maintaining a high level of performance as evidenced by relatively small changes in the lens system's modulation transfer function (MTF) as it is focused. The lens systems can include four lens units, namely, a positive first lens unit having a positive subunit and a negative subunit, a positive second lens unit having four lens elements at least one of which is negative, a negative corrector lens unit having an aspherical lens element, and a third lens unit which is liquid coupled to a cathode ray tube (16) during use.
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Epps Georgia
Klee Maurice M.
Schwartz Jordan M.
U.S. Precision Lens Inc.
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