Image pickup lens
AssigneeKantatsu Co., Ltd.
InventorSayuri Noda
Life of this patent
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AssigneeKantatsu Co., Ltd.
InventorSayuri Noda
Estimating the term…
An image pickup lens includes a first lens with positive refractive power having a convex object-side surface, a second lens with negative refractive power, a third meniscus lens having a concave image-side surface, a fourth meniscus lens having a convex image-side surface, and a fifth lens with negative refractive power as a double-sided aspheric lens having a concave object-side and image-side surfaces near an optical axis; wherein following conditional expressions (9) and (12) are satisfied; 1.0<|(r3+r4)/(r3−r4)|<1.3 (9) −1.1<f2/f<−0.7 (12) where r3 represents a curvature radius of an object-side surface of the second lens, r4 represents a curvature radius of an image-side surface of the second lens, f represents a focal length of an overall optical system of the image pickup lens, and f2 represents a focal length of the second lens.
An image pickup lens composed of five lenses for a solid imaging element, comprising, in order from an object side to an image side, a first lens having a positive refractive power with a convex surface facing the object side, a second lens having a negative refractive power, a third lens as a meniscus lens with a concave surface facing the image side, a fourth lens as a meniscus lens with a convex surface facing the image side, and a fifth lens having both sides formed as aspherical surfaces and having a negative refractive power with a concave surface facing the object side and the image side near an optical axis;
Dependencies are inferred from the claim text.