LARGE CALIBER STANDARD LENS

A large caliber standard lens having a first lens of a positive refractive power; a second lens of a negative refractive power; a diaphragm; a third lens of a negative refractive power; a fourth lens of a positive refractive power; and a fifth lens of a positive refractive power, wherein the lenses...

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Bibliographic Details
Main Author HEU MIN
Format Patent
LanguageEnglish
Published 17.06.2010
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:A large caliber standard lens having a first lens of a positive refractive power; a second lens of a negative refractive power; a diaphragm; a third lens of a negative refractive power; a fourth lens of a positive refractive power; and a fifth lens of a positive refractive power, wherein the lenses are arranged sequentially from an object side to an image side, and the first lens, the second lens, the third lens, and the fourth lens are meniscus lenses having concave surfaces facing the diaphragm and satisfy the following inequality, 0.6 ≤  R 6 R 4  ≤ 1.0 where R4 represents the radius of curvature of the surface of the second lens facing the image, and R6 represents the radius of curvature of the surface of the third lens facing the object.
Bibliography:Application Number: US20090624512