Lens module for image capture
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United States of America Patent
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Jun 30, 2015
Grant Date -
Aug 29, 2013
app pub date -
Mar 18, 2011
filing date -
Sep 28, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
An optical module comprises: a first positive meniscus lens having a focal length F1 and comprising a first convex optical surface facing an object side, and a second concave optical surface facing an image side; a second positive meniscus lens having a focal length F2 and comprising a third concave optical surface facing the object side, and a fourth convex optical surface facing the image side. The four surfaces follow the curvature equation: Zi=CURViYi2/(1+(1−(1+Ki)CURVi2Yi2)1/2)+(Ai)Yi2+(Bi)Yi4+(Ci)Yi6+(Di)Yi8 with Mi=1−(1+Ki)(CURVi)2(Ri)2 where: i is the surface number, Ki is the conic constant of the i-th surface; CURVi is the curvature of the i-th surface at the optical axis; Ai, Bi, Ci, Di, are aspheric coefficients of the i-th surface; Ri is the effective radius of aperture of the i-th surface. The following relations are satisfied: 0.60
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