Projection television lens systems having improved modulation transfer functions
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United States of America Patent
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-
Sep 3, 2002
Grant Date -
N/A
app pub date -
Dec 22, 2000
filing date -
Jun 24, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Six-component projection lens systems (13) for use in CRT projection televisions (10) are provided. To provide an improved overall modulation transfer function across the field of view of the lens, the system's first lens element (L1) has an object side surface (S.sub.2) which has a best fit spherical surface which is convex to the CRT (16). To provide partial axial color correction, the system's second lens element (L2) is made of a high dispersion material, such as styrene.
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