High performance, thermally-stabilized projection television len

Optical: systems and elements – Lens – With field curvature shaping

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G02B 1318

Patent

active

054557135

ABSTRACT:
High performance projection lens systems for use in projection televisions are provided. The systems include A, B, C, and CR lens units. The A unit is composed of a negative subunit and a positive subunit, each of which have substantial optical power. The power of these subunits allows for better aberration control at greater field angles than that achieved with prior systems in which the elements of the A unit were of weak power. In certain embodiments, the lens system is thermally compensated through the use of a positive plastic lens element as part of the B unit.

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